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> 40109e3765SNeilBrown #include <trace/events/block.h> 4143b2e5d8SNeilBrown #include "md.h" 42ef740c37SChristoph Hellwig #include "raid1.h" 43ef740c37SChristoph Hellwig #include "bitmap.h" 44191ea9b2SNeilBrown 451da177e4SLinus Torvalds /* 461da177e4SLinus Torvalds * Number of guaranteed r1bios in case of extreme VM load: 471da177e4SLinus Torvalds */ 481da177e4SLinus Torvalds #define NR_RAID1_BIOS 256 491da177e4SLinus Torvalds 50473e87ceSJonathan Brassow /* when we get a read error on a read-only array, we redirect to another 51473e87ceSJonathan Brassow * device without failing the first device, or trying to over-write to 52473e87ceSJonathan Brassow * correct the read error. To keep track of bad blocks on a per-bio 53473e87ceSJonathan Brassow * level, we store IO_BLOCKED in the appropriate 'bios' pointer 54473e87ceSJonathan Brassow */ 55473e87ceSJonathan Brassow #define IO_BLOCKED ((struct bio *)1) 56473e87ceSJonathan Brassow /* When we successfully write to a known bad-block, we need to remove the 57473e87ceSJonathan Brassow * bad-block marking which must be done from process context. So we record 58473e87ceSJonathan Brassow * the success by setting devs[n].bio to IO_MADE_GOOD 59473e87ceSJonathan Brassow */ 60473e87ceSJonathan Brassow #define IO_MADE_GOOD ((struct bio *)2) 61473e87ceSJonathan Brassow 62473e87ceSJonathan Brassow #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) 63473e87ceSJonathan Brassow 6434db0cd6SNeilBrown /* When there are this many requests queue to be written by 6534db0cd6SNeilBrown * the raid1 thread, we become 'congested' to provide back-pressure 6634db0cd6SNeilBrown * for writeback. 6734db0cd6SNeilBrown */ 6834db0cd6SNeilBrown static int max_queued_requests = 1024; 691da177e4SLinus Torvalds 7079ef3a8aSmajianpeng static void allow_barrier(struct r1conf *conf, sector_t start_next_window, 7179ef3a8aSmajianpeng sector_t bi_sector); 72e8096360SNeilBrown static void lower_barrier(struct r1conf *conf); 731da177e4SLinus Torvalds 74578b54adSNeilBrown #define raid1_log(md, fmt, args...) \ 75578b54adSNeilBrown do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0) 76578b54adSNeilBrown 77dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 781da177e4SLinus Torvalds { 791da177e4SLinus Torvalds struct pool_info *pi = data; 809f2c9d12SNeilBrown int size = offsetof(struct r1bio, bios[pi->raid_disks]); 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 837eaceaccSJens Axboe return kzalloc(size, gfp_flags); 841da177e4SLinus Torvalds } 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 871da177e4SLinus Torvalds { 881da177e4SLinus Torvalds kfree(r1_bio); 891da177e4SLinus Torvalds } 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds #define RESYNC_BLOCK_SIZE (64*1024) 928e005f7cSmajianpeng #define RESYNC_DEPTH 32 931da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 941da177e4SLinus Torvalds #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) 958e005f7cSmajianpeng #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) 968e005f7cSmajianpeng #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) 97c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) 98c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) 998e005f7cSmajianpeng #define NEXT_NORMALIO_DISTANCE (3 * RESYNC_WINDOW_SECTORS) 1001da177e4SLinus Torvalds 101dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 1021da177e4SLinus Torvalds { 1031da177e4SLinus Torvalds struct pool_info *pi = data; 1049f2c9d12SNeilBrown struct r1bio *r1_bio; 1051da177e4SLinus Torvalds struct bio *bio; 106da1aab3dSNeilBrown int need_pages; 1071da177e4SLinus Torvalds int i, j; 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 1107eaceaccSJens Axboe if (!r1_bio) 1111da177e4SLinus Torvalds return NULL; 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds /* 1141da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 1151da177e4SLinus Torvalds */ 1161da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 1176746557fSNeilBrown bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); 1181da177e4SLinus Torvalds if (!bio) 1191da177e4SLinus Torvalds goto out_free_bio; 1201da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds /* 1231da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 124d11c171eSNeilBrown * the first bio. 125d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 126d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1271da177e4SLinus Torvalds */ 128d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 129da1aab3dSNeilBrown need_pages = pi->raid_disks; 130d11c171eSNeilBrown else 131da1aab3dSNeilBrown need_pages = 1; 132da1aab3dSNeilBrown for (j = 0; j < need_pages; j++) { 133d11c171eSNeilBrown bio = r1_bio->bios[j]; 134a0787606SKent Overstreet bio->bi_vcnt = RESYNC_PAGES; 1351da177e4SLinus Torvalds 136a0787606SKent Overstreet if (bio_alloc_pages(bio, gfp_flags)) 137da1aab3dSNeilBrown goto out_free_pages; 138d11c171eSNeilBrown } 139d11c171eSNeilBrown /* If not user-requests, copy the page pointers to all bios */ 140d11c171eSNeilBrown if (!test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) { 141d11c171eSNeilBrown for (i=0; i<RESYNC_PAGES ; i++) 142d11c171eSNeilBrown for (j=1; j<pi->raid_disks; j++) 143d11c171eSNeilBrown r1_bio->bios[j]->bi_io_vec[i].bv_page = 144d11c171eSNeilBrown r1_bio->bios[0]->bi_io_vec[i].bv_page; 145d11c171eSNeilBrown } 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds return r1_bio; 1501da177e4SLinus Torvalds 151da1aab3dSNeilBrown out_free_pages: 152491221f8SGuoqing Jiang while (--j >= 0) 153491221f8SGuoqing Jiang bio_free_pages(r1_bio->bios[j]); 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; 322e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 323e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvalds /* 3261da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3271da177e4SLinus Torvalds */ 328e5872d58SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 329ddaf22abSNeilBrown 330220946c9SNeilBrown if (uptodate) 3311da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 332dd00a99eSNeilBrown else { 333dd00a99eSNeilBrown /* If all other devices have failed, we want to return 334dd00a99eSNeilBrown * the error upwards rather than fail the last device. 335dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 336dd00a99eSNeilBrown */ 337dd00a99eSNeilBrown unsigned long flags; 338dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 339dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 340dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 341e5872d58SNeilBrown test_bit(In_sync, &rdev->flags))) 342dd00a99eSNeilBrown uptodate = 1; 343dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 344dd00a99eSNeilBrown } 3451da177e4SLinus Torvalds 3467ad4d4a6SNeilBrown if (uptodate) { 3471da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 348e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 3497ad4d4a6SNeilBrown } else { 3501da177e4SLinus Torvalds /* 3511da177e4SLinus Torvalds * oops, read error: 3521da177e4SLinus Torvalds */ 3531da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3541d41c216SNeilBrown pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", 3559dd1e2faSNeilBrown mdname(conf->mddev), 3561d41c216SNeilBrown bdevname(rdev->bdev, b), 3578bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 358d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 3591da177e4SLinus Torvalds reschedule_retry(r1_bio); 3607ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */ 3611da177e4SLinus Torvalds } 3621da177e4SLinus Torvalds } 3631da177e4SLinus Torvalds 3649f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 3654e78064fSNeilBrown { 3664e78064fSNeilBrown /* it really is the end of this request */ 3674e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 3684e78064fSNeilBrown /* free extra copy of the data pages */ 369af6d7b76SNeilBrown int i = r1_bio->behind_page_count; 3704e78064fSNeilBrown while (i--) 3712ca68f5eSNeilBrown safe_put_page(r1_bio->behind_bvecs[i].bv_page); 3722ca68f5eSNeilBrown kfree(r1_bio->behind_bvecs); 3732ca68f5eSNeilBrown r1_bio->behind_bvecs = NULL; 3744e78064fSNeilBrown } 3754e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 3764e78064fSNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 3774e78064fSNeilBrown r1_bio->sectors, 3784e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 379af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 3804e78064fSNeilBrown md_write_end(r1_bio->mddev); 381cd5ff9a1SNeilBrown } 382cd5ff9a1SNeilBrown 3839f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 384cd5ff9a1SNeilBrown { 385cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 386cd5ff9a1SNeilBrown return; 387cd5ff9a1SNeilBrown 388cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 389cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 390cd5ff9a1SNeilBrown else { 391cd5ff9a1SNeilBrown close_write(r1_bio); 3924367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 3934367af55SNeilBrown reschedule_retry(r1_bio); 3944367af55SNeilBrown else 3954e78064fSNeilBrown raid_end_bio_io(r1_bio); 3964e78064fSNeilBrown } 3974e78064fSNeilBrown } 3984e78064fSNeilBrown 3994246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio) 4001da177e4SLinus Torvalds { 4019f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 402e5872d58SNeilBrown int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 403e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 40404b857f7SNeilBrown struct bio *to_put = NULL; 405e5872d58SNeilBrown int mirror = find_bio_disk(r1_bio, bio); 406e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[mirror].rdev; 407e3f948cdSShaohua Li bool discard_error; 408e3f948cdSShaohua Li 409e3f948cdSShaohua Li discard_error = bio->bi_error && bio_op(bio) == REQ_OP_DISCARD; 4101da177e4SLinus Torvalds 4111da177e4SLinus Torvalds /* 412e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4131da177e4SLinus Torvalds */ 414e3f948cdSShaohua Li if (bio->bi_error && !discard_error) { 415e5872d58SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 416e5872d58SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 41719d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 41819d67169SNeilBrown conf->mddev->recovery); 41919d67169SNeilBrown 420cd5ff9a1SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 4214367af55SNeilBrown } else { 4221da177e4SLinus Torvalds /* 423e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 424e9c7469bSTejun Heo * will return a good error code for to the higher 425e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 426e9c7469bSTejun Heo * fails. 4271da177e4SLinus Torvalds * 428e9c7469bSTejun Heo * The 'master' represents the composite IO operation 429e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 430e9c7469bSTejun Heo * will wait for the 'master' bio. 4311da177e4SLinus Torvalds */ 4324367af55SNeilBrown sector_t first_bad; 4334367af55SNeilBrown int bad_sectors; 4344367af55SNeilBrown 435cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 436cd5ff9a1SNeilBrown to_put = bio; 4373056e3aeSAlex Lyakas /* 4383056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is 4393056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use 4403056e3aeSAlex Lyakas * such device for properly reading the data back (we could 4413056e3aeSAlex Lyakas * potentially use it, if the current write would have felt 4423056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't 4433056e3aeSAlex Lyakas * check this here. 4443056e3aeSAlex Lyakas */ 445e5872d58SNeilBrown if (test_bit(In_sync, &rdev->flags) && 446e5872d58SNeilBrown !test_bit(Faulty, &rdev->flags)) 4471da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 4481da177e4SLinus Torvalds 4494367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 450e5872d58SNeilBrown if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 451e3f948cdSShaohua Li &first_bad, &bad_sectors) && !discard_error) { 4524367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 4534367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 4544367af55SNeilBrown } 4554367af55SNeilBrown } 4564367af55SNeilBrown 4574b6d287fSNeilBrown if (behind) { 458e5872d58SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) 4594b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 4604b6d287fSNeilBrown 461e9c7469bSTejun Heo /* 462e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 463e9c7469bSTejun Heo * has safely reached all non-writemostly 464e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 465e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 466e9c7469bSTejun Heo * -EIO here, instead we'll wait 467e9c7469bSTejun Heo */ 4684b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 4694b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 4704b6d287fSNeilBrown /* Maybe we can return now */ 4714b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 4724b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 47336a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 47436a4e1feSNeilBrown " %llu-%llu\n", 4754f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector, 4764f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1); 477d2eb35acSNeilBrown call_bio_endio(r1_bio); 4784b6d287fSNeilBrown } 4794b6d287fSNeilBrown } 4804b6d287fSNeilBrown } 4814367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 482e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 483e9c7469bSTejun Heo 4841da177e4SLinus Torvalds /* 4851da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 4861da177e4SLinus Torvalds * already. 4871da177e4SLinus Torvalds */ 488af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 489c70810b3SNeilBrown 49004b857f7SNeilBrown if (to_put) 49104b857f7SNeilBrown bio_put(to_put); 4921da177e4SLinus Torvalds } 4931da177e4SLinus Torvalds 4941da177e4SLinus Torvalds /* 4951da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 4961da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 4971da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 4981da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 4991da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 5001da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 5011da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 5021da177e4SLinus Torvalds * 5031da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 5041da177e4SLinus Torvalds * because position is mirror, not device based. 5051da177e4SLinus Torvalds * 5061da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 5071da177e4SLinus Torvalds */ 508e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 5091da177e4SLinus Torvalds { 510af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 511d2eb35acSNeilBrown int sectors; 512d2eb35acSNeilBrown int best_good_sectors; 5139dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 5149dedf603SShaohua Li int has_nonrot_disk; 515be4d3280SShaohua Li int disk; 51676073054SNeilBrown sector_t best_dist; 5179dedf603SShaohua Li unsigned int min_pending; 5183cb03002SNeilBrown struct md_rdev *rdev; 519f3ac8bf7SNeilBrown int choose_first; 52012cee5a8SShaohua Li int choose_next_idle; 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds rcu_read_lock(); 5231da177e4SLinus Torvalds /* 5248ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 5251da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 5261da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 5271da177e4SLinus Torvalds */ 5281da177e4SLinus Torvalds retry: 529d2eb35acSNeilBrown sectors = r1_bio->sectors; 53076073054SNeilBrown best_disk = -1; 5319dedf603SShaohua Li best_dist_disk = -1; 53276073054SNeilBrown best_dist = MaxSector; 5339dedf603SShaohua Li best_pending_disk = -1; 5349dedf603SShaohua Li min_pending = UINT_MAX; 535d2eb35acSNeilBrown best_good_sectors = 0; 5369dedf603SShaohua Li has_nonrot_disk = 0; 53712cee5a8SShaohua Li choose_next_idle = 0; 538d2eb35acSNeilBrown 5397d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) || 5407d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) && 54190382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, 5427d49ffcfSGoldwyn Rodrigues this_sector + sectors))) 5437d49ffcfSGoldwyn Rodrigues choose_first = 1; 5447d49ffcfSGoldwyn Rodrigues else 5457d49ffcfSGoldwyn Rodrigues choose_first = 0; 5461da177e4SLinus Torvalds 547be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 54876073054SNeilBrown sector_t dist; 549d2eb35acSNeilBrown sector_t first_bad; 550d2eb35acSNeilBrown int bad_sectors; 5519dedf603SShaohua Li unsigned int pending; 55212cee5a8SShaohua Li bool nonrot; 553d2eb35acSNeilBrown 554f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 555f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 556f3ac8bf7SNeilBrown || rdev == NULL 55776073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 558f3ac8bf7SNeilBrown continue; 55976073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 56076073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 56176073054SNeilBrown continue; 56276073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 56376073054SNeilBrown /* Don't balance among write-mostly, just 56476073054SNeilBrown * use the first as a last resort */ 565d1901ef0STomáš Hodek if (best_dist_disk < 0) { 566307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 567307729c8SNeilBrown &first_bad, &bad_sectors)) { 568816b0acfSWei Fang if (first_bad <= this_sector) 569307729c8SNeilBrown /* Cannot use this */ 570307729c8SNeilBrown continue; 571307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 572307729c8SNeilBrown } else 573307729c8SNeilBrown best_good_sectors = sectors; 574d1901ef0STomáš Hodek best_dist_disk = disk; 575d1901ef0STomáš Hodek best_pending_disk = disk; 576307729c8SNeilBrown } 57776073054SNeilBrown continue; 5788ddf9efeSNeilBrown } 57976073054SNeilBrown /* This is a reasonable device to use. It might 58076073054SNeilBrown * even be best. 5811da177e4SLinus Torvalds */ 582d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 583d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 584d2eb35acSNeilBrown if (best_dist < MaxSector) 585d2eb35acSNeilBrown /* already have a better device */ 586d2eb35acSNeilBrown continue; 587d2eb35acSNeilBrown if (first_bad <= this_sector) { 588d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 589d2eb35acSNeilBrown * device, then we must not read beyond 590d2eb35acSNeilBrown * bad_sectors from another device.. 591d2eb35acSNeilBrown */ 592d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 593d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 594d2eb35acSNeilBrown sectors = bad_sectors; 595d2eb35acSNeilBrown if (best_good_sectors > sectors) 596d2eb35acSNeilBrown best_good_sectors = sectors; 597d2eb35acSNeilBrown 598d2eb35acSNeilBrown } else { 599d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 600d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 601d2eb35acSNeilBrown best_good_sectors = good_sectors; 602d2eb35acSNeilBrown best_disk = disk; 603d2eb35acSNeilBrown } 604d2eb35acSNeilBrown if (choose_first) 605d2eb35acSNeilBrown break; 606d2eb35acSNeilBrown } 607d2eb35acSNeilBrown continue; 608d2eb35acSNeilBrown } else 609d2eb35acSNeilBrown best_good_sectors = sectors; 610d2eb35acSNeilBrown 61112cee5a8SShaohua Li nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); 61212cee5a8SShaohua Li has_nonrot_disk |= nonrot; 6139dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 61476073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 61512cee5a8SShaohua Li if (choose_first) { 61676073054SNeilBrown best_disk = disk; 6171da177e4SLinus Torvalds break; 6181da177e4SLinus Torvalds } 61912cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 62012cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 62112cee5a8SShaohua Li || dist == 0) { 62212cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 62312cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 62412cee5a8SShaohua Li 62512cee5a8SShaohua Li best_disk = disk; 62612cee5a8SShaohua Li /* 62712cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 62812cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 62912cee5a8SShaohua Li * the idle disk. read_balance could already choose an 63012cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 63112cee5a8SShaohua Li * this disk. This doesn't matter because this disk 63212cee5a8SShaohua Li * will idle, next time it will be utilized after the 63312cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 63412cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 63512cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 63612cee5a8SShaohua Li * small, but not a big deal since when the second disk 63712cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 63812cee5a8SShaohua Li */ 63912cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 64012cee5a8SShaohua Li mirror->seq_start != MaxSector && 64112cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 64212cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 64312cee5a8SShaohua Li mirror->seq_start) { 64412cee5a8SShaohua Li choose_next_idle = 1; 64512cee5a8SShaohua Li continue; 64612cee5a8SShaohua Li } 64712cee5a8SShaohua Li break; 64812cee5a8SShaohua Li } 64912cee5a8SShaohua Li /* If device is idle, use it */ 65012cee5a8SShaohua Li if (pending == 0) { 65112cee5a8SShaohua Li best_disk = disk; 65212cee5a8SShaohua Li break; 65312cee5a8SShaohua Li } 65412cee5a8SShaohua Li 65512cee5a8SShaohua Li if (choose_next_idle) 65612cee5a8SShaohua Li continue; 6579dedf603SShaohua Li 6589dedf603SShaohua Li if (min_pending > pending) { 6599dedf603SShaohua Li min_pending = pending; 6609dedf603SShaohua Li best_pending_disk = disk; 6619dedf603SShaohua Li } 6629dedf603SShaohua Li 66376073054SNeilBrown if (dist < best_dist) { 66476073054SNeilBrown best_dist = dist; 6659dedf603SShaohua Li best_dist_disk = disk; 6661da177e4SLinus Torvalds } 667f3ac8bf7SNeilBrown } 6681da177e4SLinus Torvalds 6699dedf603SShaohua Li /* 6709dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 6719dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 6729dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 6739dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 6749dedf603SShaohua Li */ 6759dedf603SShaohua Li if (best_disk == -1) { 6769dedf603SShaohua Li if (has_nonrot_disk) 6779dedf603SShaohua Li best_disk = best_pending_disk; 6789dedf603SShaohua Li else 6799dedf603SShaohua Li best_disk = best_dist_disk; 6809dedf603SShaohua Li } 6819dedf603SShaohua Li 68276073054SNeilBrown if (best_disk >= 0) { 68376073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 6848ddf9efeSNeilBrown if (!rdev) 6858ddf9efeSNeilBrown goto retry; 6868ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 687d2eb35acSNeilBrown sectors = best_good_sectors; 68812cee5a8SShaohua Li 68912cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 69012cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 69112cee5a8SShaohua Li 692be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 6931da177e4SLinus Torvalds } 6941da177e4SLinus Torvalds rcu_read_unlock(); 695d2eb35acSNeilBrown *max_sectors = sectors; 6961da177e4SLinus Torvalds 69776073054SNeilBrown return best_disk; 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds 7005c675f83SNeilBrown static int raid1_congested(struct mddev *mddev, int bits) 7010d129228SNeilBrown { 702e8096360SNeilBrown struct r1conf *conf = mddev->private; 7030d129228SNeilBrown int i, ret = 0; 7040d129228SNeilBrown 7054452226eSTejun Heo if ((bits & (1 << WB_async_congested)) && 70634db0cd6SNeilBrown conf->pending_count >= max_queued_requests) 70734db0cd6SNeilBrown return 1; 70834db0cd6SNeilBrown 7090d129228SNeilBrown rcu_read_lock(); 710f53e29fcSNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 7113cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 7120d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 713165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 7140d129228SNeilBrown 7151ed7242eSJonathan Brassow BUG_ON(!q); 7161ed7242eSJonathan Brassow 7170d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 7180d129228SNeilBrown * non-congested targets, it can be removed 7190d129228SNeilBrown */ 7204452226eSTejun Heo if ((bits & (1 << WB_async_congested)) || 1) 7210d129228SNeilBrown ret |= bdi_congested(&q->backing_dev_info, bits); 7220d129228SNeilBrown else 7230d129228SNeilBrown ret &= bdi_congested(&q->backing_dev_info, bits); 7240d129228SNeilBrown } 7250d129228SNeilBrown } 7260d129228SNeilBrown rcu_read_unlock(); 7270d129228SNeilBrown return ret; 7280d129228SNeilBrown } 7290d129228SNeilBrown 730e8096360SNeilBrown static void flush_pending_writes(struct r1conf *conf) 731a35e63efSNeilBrown { 732a35e63efSNeilBrown /* Any writes that have been queued but are awaiting 733a35e63efSNeilBrown * bitmap updates get flushed here. 734a35e63efSNeilBrown */ 735a35e63efSNeilBrown spin_lock_irq(&conf->device_lock); 736a35e63efSNeilBrown 737a35e63efSNeilBrown if (conf->pending_bio_list.head) { 738a35e63efSNeilBrown struct bio *bio; 739a35e63efSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 74034db0cd6SNeilBrown conf->pending_count = 0; 741a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 742a35e63efSNeilBrown /* flush any pending bitmap writes to 743a35e63efSNeilBrown * disk before proceeding w/ I/O */ 744a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 74534db0cd6SNeilBrown wake_up(&conf->wait_barrier); 746a35e63efSNeilBrown 747a35e63efSNeilBrown while (bio) { /* submit pending writes */ 748a35e63efSNeilBrown struct bio *next = bio->bi_next; 7495e2c7a36SNeilBrown struct md_rdev *rdev = (void*)bio->bi_bdev; 750a35e63efSNeilBrown bio->bi_next = NULL; 7515e2c7a36SNeilBrown bio->bi_bdev = rdev->bdev; 7525e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 7535e2c7a36SNeilBrown bio->bi_error = -EIO; 7545e2c7a36SNeilBrown bio_endio(bio); 7555e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 7562ff8cc2cSShaohua Li !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) 7572ff8cc2cSShaohua Li /* Just ignore it */ 7584246a0b6SChristoph Hellwig bio_endio(bio); 7592ff8cc2cSShaohua Li else 760a35e63efSNeilBrown generic_make_request(bio); 761a35e63efSNeilBrown bio = next; 762a35e63efSNeilBrown } 763a35e63efSNeilBrown } else 764a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 7657eaceaccSJens Axboe } 7667eaceaccSJens Axboe 76717999be4SNeilBrown /* Barriers.... 76817999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 76917999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 77017999be4SNeilBrown * To do this we raise a 'barrier'. 77117999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 77217999be4SNeilBrown * to count how many activities are happening which preclude 77317999be4SNeilBrown * normal IO. 77417999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 77517999be4SNeilBrown * i.e. if nr_pending == 0. 77617999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 77717999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 77817999be4SNeilBrown * is ready, no other operations which require a barrier will start 77917999be4SNeilBrown * until the IO request has had a chance. 78017999be4SNeilBrown * 78117999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 78217999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 78317999be4SNeilBrown * allow_barrier when it has finished its IO. 78417999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 78517999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 78617999be4SNeilBrown * lower_barrier when the particular background IO completes. 7871da177e4SLinus Torvalds */ 788c2fd4c94SNeilBrown static void raise_barrier(struct r1conf *conf, sector_t sector_nr) 7891da177e4SLinus Torvalds { 7901da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 7911da177e4SLinus Torvalds 79217999be4SNeilBrown /* Wait until no block IO is waiting */ 79317999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, !conf->nr_waiting, 794eed8c02eSLukas Czerner conf->resync_lock); 79517999be4SNeilBrown 79617999be4SNeilBrown /* block any new IO from starting */ 79717999be4SNeilBrown conf->barrier++; 798c2fd4c94SNeilBrown conf->next_resync = sector_nr; 79917999be4SNeilBrown 80079ef3a8aSmajianpeng /* For these conditions we must wait: 80179ef3a8aSmajianpeng * A: while the array is in frozen state 80279ef3a8aSmajianpeng * B: while barrier >= RESYNC_DEPTH, meaning resync reach 80379ef3a8aSmajianpeng * the max count which allowed. 80479ef3a8aSmajianpeng * C: next_resync + RESYNC_SECTORS > start_next_window, meaning 80579ef3a8aSmajianpeng * next resync will reach to the window which normal bios are 80679ef3a8aSmajianpeng * handling. 8072f73d3c5SNeilBrown * D: while there are any active requests in the current window. 80879ef3a8aSmajianpeng */ 80917999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 810b364e3d0Smajianpeng !conf->array_frozen && 81179ef3a8aSmajianpeng conf->barrier < RESYNC_DEPTH && 8122f73d3c5SNeilBrown conf->current_window_requests == 0 && 81379ef3a8aSmajianpeng (conf->start_next_window >= 81479ef3a8aSmajianpeng conf->next_resync + RESYNC_SECTORS), 815eed8c02eSLukas Czerner conf->resync_lock); 81617999be4SNeilBrown 81734e97f17SNeilBrown conf->nr_pending++; 8181da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 8191da177e4SLinus Torvalds } 8201da177e4SLinus Torvalds 821e8096360SNeilBrown static void lower_barrier(struct r1conf *conf) 82217999be4SNeilBrown { 82317999be4SNeilBrown unsigned long flags; 824709ae487SNeilBrown BUG_ON(conf->barrier <= 0); 82517999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 82617999be4SNeilBrown conf->barrier--; 82734e97f17SNeilBrown conf->nr_pending--; 82817999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 82917999be4SNeilBrown wake_up(&conf->wait_barrier); 83017999be4SNeilBrown } 83117999be4SNeilBrown 83279ef3a8aSmajianpeng static bool need_to_wait_for_sync(struct r1conf *conf, struct bio *bio) 83317999be4SNeilBrown { 83479ef3a8aSmajianpeng bool wait = false; 83579ef3a8aSmajianpeng 83679ef3a8aSmajianpeng if (conf->array_frozen || !bio) 83779ef3a8aSmajianpeng wait = true; 83879ef3a8aSmajianpeng else if (conf->barrier && bio_data_dir(bio) == WRITE) { 83923554960SNeilBrown if ((conf->mddev->curr_resync_completed 84079ef3a8aSmajianpeng >= bio_end_sector(bio)) || 841f2c771a6SNeilBrown (conf->start_next_window + NEXT_NORMALIO_DISTANCE 8424f024f37SKent Overstreet <= bio->bi_iter.bi_sector)) 84379ef3a8aSmajianpeng wait = false; 84479ef3a8aSmajianpeng else 84579ef3a8aSmajianpeng wait = true; 84679ef3a8aSmajianpeng } 84779ef3a8aSmajianpeng 84879ef3a8aSmajianpeng return wait; 84979ef3a8aSmajianpeng } 85079ef3a8aSmajianpeng 85179ef3a8aSmajianpeng static sector_t wait_barrier(struct r1conf *conf, struct bio *bio) 85279ef3a8aSmajianpeng { 85379ef3a8aSmajianpeng sector_t sector = 0; 85479ef3a8aSmajianpeng 85517999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 85679ef3a8aSmajianpeng if (need_to_wait_for_sync(conf, bio)) { 85717999be4SNeilBrown conf->nr_waiting++; 858d6b42dcbSNeilBrown /* Wait for the barrier to drop. 859d6b42dcbSNeilBrown * However if there are already pending 860d6b42dcbSNeilBrown * requests (preventing the barrier from 861d6b42dcbSNeilBrown * rising completely), and the 8625965b642SNeilBrown * per-process bio queue isn't empty, 863d6b42dcbSNeilBrown * then don't wait, as we need to empty 8645965b642SNeilBrown * that queue to allow conf->start_next_window 8655965b642SNeilBrown * to increase. 866d6b42dcbSNeilBrown */ 867578b54adSNeilBrown raid1_log(conf->mddev, "wait barrier"); 868d6b42dcbSNeilBrown wait_event_lock_irq(conf->wait_barrier, 869b364e3d0Smajianpeng !conf->array_frozen && 870b364e3d0Smajianpeng (!conf->barrier || 87179ef3a8aSmajianpeng ((conf->start_next_window < 87279ef3a8aSmajianpeng conf->next_resync + RESYNC_SECTORS) && 873d6b42dcbSNeilBrown current->bio_list && 874b364e3d0Smajianpeng !bio_list_empty(current->bio_list))), 875eed8c02eSLukas Czerner conf->resync_lock); 87617999be4SNeilBrown conf->nr_waiting--; 87717999be4SNeilBrown } 87879ef3a8aSmajianpeng 87979ef3a8aSmajianpeng if (bio && bio_data_dir(bio) == WRITE) { 880e8ff8bf0SJes Sorensen if (bio->bi_iter.bi_sector >= conf->next_resync) { 88179ef3a8aSmajianpeng if (conf->start_next_window == MaxSector) 88279ef3a8aSmajianpeng conf->start_next_window = 88379ef3a8aSmajianpeng conf->next_resync + 88479ef3a8aSmajianpeng NEXT_NORMALIO_DISTANCE; 88579ef3a8aSmajianpeng 88679ef3a8aSmajianpeng if ((conf->start_next_window + NEXT_NORMALIO_DISTANCE) 8874f024f37SKent Overstreet <= bio->bi_iter.bi_sector) 88879ef3a8aSmajianpeng conf->next_window_requests++; 88979ef3a8aSmajianpeng else 89079ef3a8aSmajianpeng conf->current_window_requests++; 89179ef3a8aSmajianpeng sector = conf->start_next_window; 89217999be4SNeilBrown } 89341a336e0SNeilBrown } 89417999be4SNeilBrown 89579ef3a8aSmajianpeng conf->nr_pending++; 89679ef3a8aSmajianpeng spin_unlock_irq(&conf->resync_lock); 89779ef3a8aSmajianpeng return sector; 89879ef3a8aSmajianpeng } 89979ef3a8aSmajianpeng 90079ef3a8aSmajianpeng static void allow_barrier(struct r1conf *conf, sector_t start_next_window, 90179ef3a8aSmajianpeng sector_t bi_sector) 90217999be4SNeilBrown { 90317999be4SNeilBrown unsigned long flags; 90479ef3a8aSmajianpeng 90517999be4SNeilBrown spin_lock_irqsave(&conf->resync_lock, flags); 90617999be4SNeilBrown conf->nr_pending--; 90779ef3a8aSmajianpeng if (start_next_window) { 90879ef3a8aSmajianpeng if (start_next_window == conf->start_next_window) { 90979ef3a8aSmajianpeng if (conf->start_next_window + NEXT_NORMALIO_DISTANCE 91079ef3a8aSmajianpeng <= bi_sector) 91179ef3a8aSmajianpeng conf->next_window_requests--; 91279ef3a8aSmajianpeng else 91379ef3a8aSmajianpeng conf->current_window_requests--; 91479ef3a8aSmajianpeng } else 91579ef3a8aSmajianpeng conf->current_window_requests--; 91679ef3a8aSmajianpeng 91779ef3a8aSmajianpeng if (!conf->current_window_requests) { 91879ef3a8aSmajianpeng if (conf->next_window_requests) { 91979ef3a8aSmajianpeng conf->current_window_requests = 92079ef3a8aSmajianpeng conf->next_window_requests; 92179ef3a8aSmajianpeng conf->next_window_requests = 0; 92279ef3a8aSmajianpeng conf->start_next_window += 92379ef3a8aSmajianpeng NEXT_NORMALIO_DISTANCE; 92479ef3a8aSmajianpeng } else 92579ef3a8aSmajianpeng conf->start_next_window = MaxSector; 92679ef3a8aSmajianpeng } 92779ef3a8aSmajianpeng } 92817999be4SNeilBrown spin_unlock_irqrestore(&conf->resync_lock, flags); 92917999be4SNeilBrown wake_up(&conf->wait_barrier); 93017999be4SNeilBrown } 93117999be4SNeilBrown 932e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra) 933ddaf22abSNeilBrown { 934ddaf22abSNeilBrown /* stop syncio and normal IO and wait for everything to 935ddaf22abSNeilBrown * go quite. 936b364e3d0Smajianpeng * We wait until nr_pending match nr_queued+extra 9371c830532SNeilBrown * This is called in the context of one normal IO request 9381c830532SNeilBrown * that has failed. Thus any sync request that might be pending 9391c830532SNeilBrown * will be blocked by nr_pending, and we need to wait for 9401c830532SNeilBrown * pending IO requests to complete or be queued for re-try. 941e2d59925SNeilBrown * Thus the number queued (nr_queued) plus this request (extra) 9421c830532SNeilBrown * must match the number of pending IOs (nr_pending) before 9431c830532SNeilBrown * we continue. 944ddaf22abSNeilBrown */ 945ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 946b364e3d0Smajianpeng conf->array_frozen = 1; 947578b54adSNeilBrown raid1_log(conf->mddev, "wait freeze"); 948eed8c02eSLukas Czerner wait_event_lock_irq_cmd(conf->wait_barrier, 949e2d59925SNeilBrown conf->nr_pending == conf->nr_queued+extra, 950ddaf22abSNeilBrown conf->resync_lock, 951c3b328acSNeilBrown flush_pending_writes(conf)); 952ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 953ddaf22abSNeilBrown } 954e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 955ddaf22abSNeilBrown { 956ddaf22abSNeilBrown /* reverse the effect of the freeze */ 957ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 958b364e3d0Smajianpeng conf->array_frozen = 0; 959ddaf22abSNeilBrown wake_up(&conf->wait_barrier); 960ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 961ddaf22abSNeilBrown } 962ddaf22abSNeilBrown 9634e78064fSNeilBrown /* duplicate the data pages for behind I/O 9644e78064fSNeilBrown */ 9659f2c9d12SNeilBrown static void alloc_behind_pages(struct bio *bio, struct r1bio *r1_bio) 9664b6d287fSNeilBrown { 9674b6d287fSNeilBrown int i; 9684b6d287fSNeilBrown struct bio_vec *bvec; 9692ca68f5eSNeilBrown struct bio_vec *bvecs = kzalloc(bio->bi_vcnt * sizeof(struct bio_vec), 9704b6d287fSNeilBrown GFP_NOIO); 9712ca68f5eSNeilBrown if (unlikely(!bvecs)) 972af6d7b76SNeilBrown return; 9734b6d287fSNeilBrown 974cb34e057SKent Overstreet bio_for_each_segment_all(bvec, bio, i) { 9752ca68f5eSNeilBrown bvecs[i] = *bvec; 9762ca68f5eSNeilBrown bvecs[i].bv_page = alloc_page(GFP_NOIO); 9772ca68f5eSNeilBrown if (unlikely(!bvecs[i].bv_page)) 9784b6d287fSNeilBrown goto do_sync_io; 9792ca68f5eSNeilBrown memcpy(kmap(bvecs[i].bv_page) + bvec->bv_offset, 9804b6d287fSNeilBrown kmap(bvec->bv_page) + bvec->bv_offset, bvec->bv_len); 9812ca68f5eSNeilBrown kunmap(bvecs[i].bv_page); 9824b6d287fSNeilBrown kunmap(bvec->bv_page); 9834b6d287fSNeilBrown } 9842ca68f5eSNeilBrown r1_bio->behind_bvecs = bvecs; 985af6d7b76SNeilBrown r1_bio->behind_page_count = bio->bi_vcnt; 986af6d7b76SNeilBrown set_bit(R1BIO_BehindIO, &r1_bio->state); 987af6d7b76SNeilBrown return; 9884b6d287fSNeilBrown 9894b6d287fSNeilBrown do_sync_io: 990af6d7b76SNeilBrown for (i = 0; i < bio->bi_vcnt; i++) 9912ca68f5eSNeilBrown if (bvecs[i].bv_page) 9922ca68f5eSNeilBrown put_page(bvecs[i].bv_page); 9932ca68f5eSNeilBrown kfree(bvecs); 9944f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n", 9954f024f37SKent Overstreet bio->bi_iter.bi_size); 9964b6d287fSNeilBrown } 9974b6d287fSNeilBrown 998f54a9d0eSNeilBrown struct raid1_plug_cb { 999f54a9d0eSNeilBrown struct blk_plug_cb cb; 1000f54a9d0eSNeilBrown struct bio_list pending; 1001f54a9d0eSNeilBrown int pending_cnt; 1002f54a9d0eSNeilBrown }; 1003f54a9d0eSNeilBrown 1004f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) 1005f54a9d0eSNeilBrown { 1006f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, 1007f54a9d0eSNeilBrown cb); 1008f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data; 1009f54a9d0eSNeilBrown struct r1conf *conf = mddev->private; 1010f54a9d0eSNeilBrown struct bio *bio; 1011f54a9d0eSNeilBrown 1012874807a8SNeilBrown if (from_schedule || current->bio_list) { 1013f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock); 1014f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending); 1015f54a9d0eSNeilBrown conf->pending_count += plug->pending_cnt; 1016f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock); 1017ee0b0244SNeilBrown wake_up(&conf->wait_barrier); 1018f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread); 1019f54a9d0eSNeilBrown kfree(plug); 1020f54a9d0eSNeilBrown return; 1021f54a9d0eSNeilBrown } 1022f54a9d0eSNeilBrown 1023f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */ 1024f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending); 1025f54a9d0eSNeilBrown bitmap_unplug(mddev->bitmap); 1026f54a9d0eSNeilBrown wake_up(&conf->wait_barrier); 1027f54a9d0eSNeilBrown 1028f54a9d0eSNeilBrown while (bio) { /* submit pending writes */ 1029f54a9d0eSNeilBrown struct bio *next = bio->bi_next; 10305e2c7a36SNeilBrown struct md_rdev *rdev = (void*)bio->bi_bdev; 1031f54a9d0eSNeilBrown bio->bi_next = NULL; 10325e2c7a36SNeilBrown bio->bi_bdev = rdev->bdev; 10335e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 10345e2c7a36SNeilBrown bio->bi_error = -EIO; 10355e2c7a36SNeilBrown bio_endio(bio); 10365e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_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; 1056796a5cf0SMike Christie const int op = bio_op(bio); 1057a362357bSJens Axboe const int rw = bio_data_dir(bio); 10581eff9d32SJens Axboe const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); 10591eff9d32SJens Axboe const unsigned long do_flush_fua = (bio->bi_opf & 106028a8f0d3SMike Christie (REQ_PREFLUSH | REQ_FUA)); 10613cb03002SNeilBrown struct md_rdev *blocked_rdev; 1062f54a9d0eSNeilBrown struct blk_plug_cb *cb; 1063f54a9d0eSNeilBrown struct raid1_plug_cb *plug = NULL; 10641f68f0c4SNeilBrown int first_clone; 10651f68f0c4SNeilBrown int sectors_handled; 10661f68f0c4SNeilBrown int max_sectors; 106779ef3a8aSmajianpeng sector_t start_next_window; 1068191ea9b2SNeilBrown 10691da177e4SLinus Torvalds /* 10701da177e4SLinus Torvalds * Register the new request and wait if the reconstruction 10711da177e4SLinus Torvalds * thread has put up a bar for new requests. 10721da177e4SLinus Torvalds * Continue immediately if no resync is active currently. 10731da177e4SLinus Torvalds */ 107462de608dSNeilBrown 10753d310eb7SNeilBrown md_write_start(mddev, bio); /* wait on superblock update early */ 10763d310eb7SNeilBrown 10776eef4b21SNeilBrown if (bio_data_dir(bio) == WRITE && 1078589a1c49SGoldwyn Rodrigues ((bio_end_sector(bio) > mddev->suspend_lo && 1079589a1c49SGoldwyn Rodrigues bio->bi_iter.bi_sector < mddev->suspend_hi) || 1080589a1c49SGoldwyn Rodrigues (mddev_is_clustered(mddev) && 108190382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(mddev, WRITE, 108290382ed9SGoldwyn Rodrigues bio->bi_iter.bi_sector, bio_end_sector(bio))))) { 10836eef4b21SNeilBrown /* As the suspend_* range is controlled by 10846eef4b21SNeilBrown * userspace, we want an interruptible 10856eef4b21SNeilBrown * wait. 10866eef4b21SNeilBrown */ 10876eef4b21SNeilBrown DEFINE_WAIT(w); 10886eef4b21SNeilBrown for (;;) { 10896eef4b21SNeilBrown flush_signals(current); 10906eef4b21SNeilBrown prepare_to_wait(&conf->wait_barrier, 10916eef4b21SNeilBrown &w, TASK_INTERRUPTIBLE); 1092f73a1c7dSKent Overstreet if (bio_end_sector(bio) <= mddev->suspend_lo || 1093589a1c49SGoldwyn Rodrigues bio->bi_iter.bi_sector >= mddev->suspend_hi || 1094589a1c49SGoldwyn Rodrigues (mddev_is_clustered(mddev) && 109590382ed9SGoldwyn Rodrigues !md_cluster_ops->area_resyncing(mddev, WRITE, 1096589a1c49SGoldwyn Rodrigues bio->bi_iter.bi_sector, bio_end_sector(bio)))) 10976eef4b21SNeilBrown break; 10986eef4b21SNeilBrown schedule(); 10996eef4b21SNeilBrown } 11006eef4b21SNeilBrown finish_wait(&conf->wait_barrier, &w); 11016eef4b21SNeilBrown } 110262de608dSNeilBrown 110379ef3a8aSmajianpeng start_next_window = wait_barrier(conf, bio); 11041da177e4SLinus Torvalds 110584255d10SNeilBrown bitmap = mddev->bitmap; 110684255d10SNeilBrown 11071da177e4SLinus Torvalds /* 110870246286SChristoph Hellwig * make_request() can abort the operation when read-ahead is being 11091da177e4SLinus Torvalds * used and no empty request is available. 11101da177e4SLinus Torvalds * 11111da177e4SLinus Torvalds */ 11121da177e4SLinus Torvalds r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 11131da177e4SLinus Torvalds 11141da177e4SLinus Torvalds r1_bio->master_bio = bio; 1115aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(bio); 1116191ea9b2SNeilBrown r1_bio->state = 0; 11171da177e4SLinus Torvalds r1_bio->mddev = mddev; 11184f024f37SKent Overstreet r1_bio->sector = bio->bi_iter.bi_sector; 11191da177e4SLinus Torvalds 1120d2eb35acSNeilBrown /* We might need to issue multiple reads to different 1121d2eb35acSNeilBrown * devices if there are bad blocks around, so we keep 1122d2eb35acSNeilBrown * track of the number of reads in bio->bi_phys_segments. 1123d2eb35acSNeilBrown * If this is 0, there is only one r1_bio and no locking 1124d2eb35acSNeilBrown * will be needed when requests complete. If it is 1125d2eb35acSNeilBrown * non-zero, then it is the number of not-completed requests. 1126d2eb35acSNeilBrown */ 1127d2eb35acSNeilBrown bio->bi_phys_segments = 0; 1128b7c44ed9SJens Axboe bio_clear_flag(bio, BIO_SEG_VALID); 1129d2eb35acSNeilBrown 1130a362357bSJens Axboe if (rw == READ) { 11311da177e4SLinus Torvalds /* 11321da177e4SLinus Torvalds * read balancing logic: 11331da177e4SLinus Torvalds */ 1134d2eb35acSNeilBrown int rdisk; 1135d2eb35acSNeilBrown 1136d2eb35acSNeilBrown read_again: 1137d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 11381da177e4SLinus Torvalds 11391da177e4SLinus Torvalds if (rdisk < 0) { 11401da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 11411da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 11425a7bbad2SChristoph Hellwig return; 11431da177e4SLinus Torvalds } 11441da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 11451da177e4SLinus Torvalds 1146e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1147e555190dSNeilBrown bitmap) { 1148e555190dSNeilBrown /* Reading from a write-mostly device must 1149e555190dSNeilBrown * take care not to over-take any writes 1150e555190dSNeilBrown * that are 'behind' 1151e555190dSNeilBrown */ 1152578b54adSNeilBrown raid1_log(mddev, "wait behind writes"); 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; 1169796a5cf0SMike Christie bio_set_op_attrs(read_bio, op, do_sync); 11701da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 11711da177e4SLinus Torvalds 1172109e3765SNeilBrown if (mddev->gendisk) 1173109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(read_bio->bi_bdev), 1174109e3765SNeilBrown read_bio, disk_devt(mddev->gendisk), 1175109e3765SNeilBrown r1_bio->sector); 1176109e3765SNeilBrown 1177d2eb35acSNeilBrown if (max_sectors < r1_bio->sectors) { 1178d2eb35acSNeilBrown /* could not read all from this device, so we will 1179d2eb35acSNeilBrown * need another r1_bio. 1180d2eb35acSNeilBrown */ 1181d2eb35acSNeilBrown 1182d2eb35acSNeilBrown sectors_handled = (r1_bio->sector + max_sectors 11834f024f37SKent Overstreet - bio->bi_iter.bi_sector); 1184d2eb35acSNeilBrown r1_bio->sectors = max_sectors; 1185d2eb35acSNeilBrown spin_lock_irq(&conf->device_lock); 1186d2eb35acSNeilBrown if (bio->bi_phys_segments == 0) 1187d2eb35acSNeilBrown bio->bi_phys_segments = 2; 1188d2eb35acSNeilBrown else 1189d2eb35acSNeilBrown bio->bi_phys_segments++; 1190d2eb35acSNeilBrown spin_unlock_irq(&conf->device_lock); 1191d2eb35acSNeilBrown /* Cannot call generic_make_request directly 1192d2eb35acSNeilBrown * as that will be queued in __make_request 1193d2eb35acSNeilBrown * and subsequent mempool_alloc might block waiting 1194d2eb35acSNeilBrown * for it. So hand bio over to raid1d. 1195d2eb35acSNeilBrown */ 1196d2eb35acSNeilBrown reschedule_retry(r1_bio); 1197d2eb35acSNeilBrown 1198d2eb35acSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 1199d2eb35acSNeilBrown 1200d2eb35acSNeilBrown r1_bio->master_bio = bio; 1201aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(bio) - sectors_handled; 1202d2eb35acSNeilBrown r1_bio->state = 0; 1203d2eb35acSNeilBrown r1_bio->mddev = mddev; 12044f024f37SKent Overstreet r1_bio->sector = bio->bi_iter.bi_sector + 12054f024f37SKent Overstreet sectors_handled; 1206d2eb35acSNeilBrown goto read_again; 1207d2eb35acSNeilBrown } else 12081da177e4SLinus Torvalds generic_make_request(read_bio); 12095a7bbad2SChristoph Hellwig return; 12101da177e4SLinus Torvalds } 12111da177e4SLinus Torvalds 12121da177e4SLinus Torvalds /* 12131da177e4SLinus Torvalds * WRITE: 12141da177e4SLinus Torvalds */ 121534db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 121634db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 1217578b54adSNeilBrown raid1_log(mddev, "wait queued"); 121834db0cd6SNeilBrown wait_event(conf->wait_barrier, 121934db0cd6SNeilBrown conf->pending_count < max_queued_requests); 122034db0cd6SNeilBrown } 12211f68f0c4SNeilBrown /* first select target devices under rcu_lock and 12221da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 12231da177e4SLinus Torvalds * bios[x] to bio 12241f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 12251f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 12261f68f0c4SNeilBrown * blocks. 12271f68f0c4SNeilBrown * This potentially requires several writes to write around 12281f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 12291f68f0c4SNeilBrown * with a set of bios attached. 12301da177e4SLinus Torvalds */ 1231c3b328acSNeilBrown 12328f19ccb2SNeilBrown disks = conf->raid_disks * 2; 12336bfe0b49SDan Williams retry_write: 123479ef3a8aSmajianpeng r1_bio->start_next_window = start_next_window; 12356bfe0b49SDan Williams blocked_rdev = NULL; 12361da177e4SLinus Torvalds rcu_read_lock(); 12371f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 12381da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 12393cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 12406bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 12416bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 12426bfe0b49SDan Williams blocked_rdev = rdev; 12436bfe0b49SDan Williams break; 12446bfe0b49SDan Williams } 12451da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 12468ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) { 12478f19ccb2SNeilBrown if (i < conf->raid_disks) 12481f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 12491f68f0c4SNeilBrown continue; 1250964147d5SNeilBrown } 12511f68f0c4SNeilBrown 12521f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 12531f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 12541f68f0c4SNeilBrown sector_t first_bad; 12551f68f0c4SNeilBrown int bad_sectors; 12561f68f0c4SNeilBrown int is_bad; 12571f68f0c4SNeilBrown 12581f68f0c4SNeilBrown is_bad = is_badblock(rdev, r1_bio->sector, 12591f68f0c4SNeilBrown max_sectors, 12601f68f0c4SNeilBrown &first_bad, &bad_sectors); 12611f68f0c4SNeilBrown if (is_bad < 0) { 12621f68f0c4SNeilBrown /* mustn't write here until the bad block is 12631f68f0c4SNeilBrown * acknowledged*/ 12641f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 12651f68f0c4SNeilBrown blocked_rdev = rdev; 12661f68f0c4SNeilBrown break; 12671f68f0c4SNeilBrown } 12681f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 12691f68f0c4SNeilBrown /* Cannot write here at all */ 12701f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 12711f68f0c4SNeilBrown if (bad_sectors < max_sectors) 12721f68f0c4SNeilBrown /* mustn't write more than bad_sectors 12731f68f0c4SNeilBrown * to other devices yet 12741f68f0c4SNeilBrown */ 12751f68f0c4SNeilBrown max_sectors = bad_sectors; 12761f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 12771f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 12781f68f0c4SNeilBrown * only applies if the disk is 12791f68f0c4SNeilBrown * missing, so it might be re-added, 12801f68f0c4SNeilBrown * and we want to know to recover this 12811f68f0c4SNeilBrown * chunk. 12821f68f0c4SNeilBrown * In this case the device is here, 12831f68f0c4SNeilBrown * and the fact that this chunk is not 12841f68f0c4SNeilBrown * in-sync is recorded in the bad 12851f68f0c4SNeilBrown * block log 12861f68f0c4SNeilBrown */ 12871f68f0c4SNeilBrown continue; 12881f68f0c4SNeilBrown } 12891f68f0c4SNeilBrown if (is_bad) { 12901f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 12911f68f0c4SNeilBrown if (good_sectors < max_sectors) 12921f68f0c4SNeilBrown max_sectors = good_sectors; 12931f68f0c4SNeilBrown } 12941f68f0c4SNeilBrown } 12951f68f0c4SNeilBrown r1_bio->bios[i] = bio; 12961da177e4SLinus Torvalds } 12971da177e4SLinus Torvalds rcu_read_unlock(); 12981da177e4SLinus Torvalds 12996bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 13006bfe0b49SDan Williams /* Wait for this device to become unblocked */ 13016bfe0b49SDan Williams int j; 130279ef3a8aSmajianpeng sector_t old = start_next_window; 13036bfe0b49SDan Williams 13046bfe0b49SDan Williams for (j = 0; j < i; j++) 13056bfe0b49SDan Williams if (r1_bio->bios[j]) 13066bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 13071f68f0c4SNeilBrown r1_bio->state = 0; 13084f024f37SKent Overstreet allow_barrier(conf, start_next_window, bio->bi_iter.bi_sector); 1309578b54adSNeilBrown raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); 13106bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 131179ef3a8aSmajianpeng start_next_window = wait_barrier(conf, bio); 131279ef3a8aSmajianpeng /* 131379ef3a8aSmajianpeng * We must make sure the multi r1bios of bio have 131479ef3a8aSmajianpeng * the same value of bi_phys_segments 131579ef3a8aSmajianpeng */ 131679ef3a8aSmajianpeng if (bio->bi_phys_segments && old && 131779ef3a8aSmajianpeng old != start_next_window) 131879ef3a8aSmajianpeng /* Wait for the former r1bio(s) to complete */ 131979ef3a8aSmajianpeng wait_event(conf->wait_barrier, 132079ef3a8aSmajianpeng bio->bi_phys_segments == 1); 13216bfe0b49SDan Williams goto retry_write; 13226bfe0b49SDan Williams } 13236bfe0b49SDan Williams 13241f68f0c4SNeilBrown if (max_sectors < r1_bio->sectors) { 13251f68f0c4SNeilBrown /* We are splitting this write into multiple parts, so 13261f68f0c4SNeilBrown * we need to prepare for allocating another r1_bio. 13271f68f0c4SNeilBrown */ 13281f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 13291f68f0c4SNeilBrown spin_lock_irq(&conf->device_lock); 13301f68f0c4SNeilBrown if (bio->bi_phys_segments == 0) 13311f68f0c4SNeilBrown bio->bi_phys_segments = 2; 13321f68f0c4SNeilBrown else 13331f68f0c4SNeilBrown bio->bi_phys_segments++; 13341f68f0c4SNeilBrown spin_unlock_irq(&conf->device_lock); 1335191ea9b2SNeilBrown } 13364f024f37SKent Overstreet sectors_handled = r1_bio->sector + max_sectors - bio->bi_iter.bi_sector; 13374b6d287fSNeilBrown 13384e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 13394b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1340191ea9b2SNeilBrown 13411f68f0c4SNeilBrown first_clone = 1; 13421da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 13431da177e4SLinus Torvalds struct bio *mbio; 13441da177e4SLinus Torvalds if (!r1_bio->bios[i]) 13451da177e4SLinus Torvalds continue; 13461da177e4SLinus Torvalds 1347a167f663SNeilBrown mbio = bio_clone_mddev(bio, GFP_NOIO, mddev); 13484f024f37SKent Overstreet bio_trim(mbio, r1_bio->sector - bio->bi_iter.bi_sector, max_sectors); 13491da177e4SLinus Torvalds 13501f68f0c4SNeilBrown if (first_clone) { 13511f68f0c4SNeilBrown /* do behind I/O ? 13521f68f0c4SNeilBrown * Not if there are too many, or cannot 13531f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 13541f68f0c4SNeilBrown * is waiting for behind writes to flush */ 13551f68f0c4SNeilBrown if (bitmap && 13561f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 13571f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 13581f68f0c4SNeilBrown !waitqueue_active(&bitmap->behind_wait)) 13591f68f0c4SNeilBrown alloc_behind_pages(mbio, r1_bio); 13601da177e4SLinus Torvalds 13611f68f0c4SNeilBrown bitmap_startwrite(bitmap, r1_bio->sector, 13621f68f0c4SNeilBrown r1_bio->sectors, 13631f68f0c4SNeilBrown test_bit(R1BIO_BehindIO, 13641f68f0c4SNeilBrown &r1_bio->state)); 13651f68f0c4SNeilBrown first_clone = 0; 13661f68f0c4SNeilBrown } 13672ca68f5eSNeilBrown if (r1_bio->behind_bvecs) { 13684b6d287fSNeilBrown struct bio_vec *bvec; 13694b6d287fSNeilBrown int j; 13704b6d287fSNeilBrown 1371cb34e057SKent Overstreet /* 1372cb34e057SKent Overstreet * We trimmed the bio, so _all is legit 13734b6d287fSNeilBrown */ 1374d74c6d51SKent Overstreet bio_for_each_segment_all(bvec, mbio, j) 13752ca68f5eSNeilBrown bvec->bv_page = r1_bio->behind_bvecs[j].bv_page; 13764b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 13774b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 13784b6d287fSNeilBrown } 13794b6d287fSNeilBrown 13801f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 13811f68f0c4SNeilBrown 13824f024f37SKent Overstreet mbio->bi_iter.bi_sector = (r1_bio->sector + 13831f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 1384109e3765SNeilBrown mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 13851f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 1386288dab8aSChristoph Hellwig bio_set_op_attrs(mbio, op, do_flush_fua | do_sync); 13871f68f0c4SNeilBrown mbio->bi_private = r1_bio; 13881f68f0c4SNeilBrown 13891da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1390f54a9d0eSNeilBrown 1391109e3765SNeilBrown if (mddev->gendisk) 1392109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(mbio->bi_bdev), 1393109e3765SNeilBrown mbio, disk_devt(mddev->gendisk), 1394109e3765SNeilBrown r1_bio->sector); 1395109e3765SNeilBrown /* flush_pending_writes() needs access to the rdev so...*/ 1396109e3765SNeilBrown mbio->bi_bdev = (void*)conf->mirrors[i].rdev; 1397109e3765SNeilBrown 1398f54a9d0eSNeilBrown cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); 1399f54a9d0eSNeilBrown if (cb) 1400f54a9d0eSNeilBrown plug = container_of(cb, struct raid1_plug_cb, cb); 1401f54a9d0eSNeilBrown else 1402f54a9d0eSNeilBrown plug = NULL; 1403191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1404f54a9d0eSNeilBrown if (plug) { 1405f54a9d0eSNeilBrown bio_list_add(&plug->pending, mbio); 1406f54a9d0eSNeilBrown plug->pending_cnt++; 1407f54a9d0eSNeilBrown } else { 14084e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 140934db0cd6SNeilBrown conf->pending_count++; 1410f54a9d0eSNeilBrown } 1411191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1412f54a9d0eSNeilBrown if (!plug) 1413b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 14144e78064fSNeilBrown } 1415079fa166SNeilBrown /* Mustn't call r1_bio_write_done before this next test, 1416079fa166SNeilBrown * as it could result in the bio being freed. 1417079fa166SNeilBrown */ 1418aa8b57aaSKent Overstreet if (sectors_handled < bio_sectors(bio)) { 1419079fa166SNeilBrown r1_bio_write_done(r1_bio); 14201f68f0c4SNeilBrown /* We need another r1_bio. It has already been counted 14211f68f0c4SNeilBrown * in bio->bi_phys_segments 14221f68f0c4SNeilBrown */ 14231f68f0c4SNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 14241f68f0c4SNeilBrown r1_bio->master_bio = bio; 1425aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(bio) - sectors_handled; 14261f68f0c4SNeilBrown r1_bio->state = 0; 14271f68f0c4SNeilBrown r1_bio->mddev = mddev; 14284f024f37SKent Overstreet r1_bio->sector = bio->bi_iter.bi_sector + sectors_handled; 14291f68f0c4SNeilBrown goto retry_write; 14301f68f0c4SNeilBrown } 14311f68f0c4SNeilBrown 1432079fa166SNeilBrown r1_bio_write_done(r1_bio); 1433079fa166SNeilBrown 1434079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1435079fa166SNeilBrown wake_up(&conf->wait_barrier); 14361da177e4SLinus Torvalds } 14371da177e4SLinus Torvalds 1438849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev) 14391da177e4SLinus Torvalds { 1440e8096360SNeilBrown struct r1conf *conf = mddev->private; 14411da177e4SLinus Torvalds int i; 14421da177e4SLinus Torvalds 14431da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 144411ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1445ddac7c7eSNeilBrown rcu_read_lock(); 1446ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 14473cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 14481da177e4SLinus Torvalds seq_printf(seq, "%s", 1449ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1450ddac7c7eSNeilBrown } 1451ddac7c7eSNeilBrown rcu_read_unlock(); 14521da177e4SLinus Torvalds seq_printf(seq, "]"); 14531da177e4SLinus Torvalds } 14541da177e4SLinus Torvalds 1455849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) 14561da177e4SLinus Torvalds { 14571da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1458e8096360SNeilBrown struct r1conf *conf = mddev->private; 1459423f04d6SNeilBrown unsigned long flags; 14601da177e4SLinus Torvalds 14611da177e4SLinus Torvalds /* 14621da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 14631da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 14641da177e4SLinus Torvalds * next level up know. 14651da177e4SLinus Torvalds * else mark the drive as failed 14661da177e4SLinus Torvalds */ 1467b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 14684044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 14691da177e4SLinus Torvalds /* 14701da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 14714044ba58SNeilBrown * normal single drive. 14724044ba58SNeilBrown * However don't try a recovery from this drive as 14734044ba58SNeilBrown * it is very likely to fail. 14741da177e4SLinus Torvalds */ 14755389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 14761da177e4SLinus Torvalds return; 14774044ba58SNeilBrown } 1478de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1479c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1480423f04d6SNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 14811da177e4SLinus Torvalds mddev->degraded++; 1482dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 14832446dba0SNeilBrown } else 14842446dba0SNeilBrown set_bit(Faulty, &rdev->flags); 1485423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 14861da177e4SLinus Torvalds /* 14871da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 14881da177e4SLinus Torvalds */ 1489dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 149085ad1d13SGuoqing Jiang set_mask_bits(&mddev->flags, 0, 149185ad1d13SGuoqing Jiang BIT(MD_CHANGE_DEVS) | BIT(MD_CHANGE_PENDING)); 14921d41c216SNeilBrown pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" 1493067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 14949dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 14959dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 14961da177e4SLinus Torvalds } 14971da177e4SLinus Torvalds 1498e8096360SNeilBrown static void print_conf(struct r1conf *conf) 14991da177e4SLinus Torvalds { 15001da177e4SLinus Torvalds int i; 15011da177e4SLinus Torvalds 15021d41c216SNeilBrown pr_debug("RAID1 conf printout:\n"); 15031da177e4SLinus Torvalds if (!conf) { 15041d41c216SNeilBrown pr_debug("(!conf)\n"); 15051da177e4SLinus Torvalds return; 15061da177e4SLinus Torvalds } 15071d41c216SNeilBrown pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 15081da177e4SLinus Torvalds conf->raid_disks); 15091da177e4SLinus Torvalds 1510ddac7c7eSNeilBrown rcu_read_lock(); 15111da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 15121da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 15133cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1514ddac7c7eSNeilBrown if (rdev) 15151d41c216SNeilBrown pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", 1516ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1517ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1518ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 15191da177e4SLinus Torvalds } 1520ddac7c7eSNeilBrown rcu_read_unlock(); 15211da177e4SLinus Torvalds } 15221da177e4SLinus Torvalds 1523e8096360SNeilBrown static void close_sync(struct r1conf *conf) 15241da177e4SLinus Torvalds { 152579ef3a8aSmajianpeng wait_barrier(conf, NULL); 152679ef3a8aSmajianpeng allow_barrier(conf, 0, 0); 15271da177e4SLinus Torvalds 15281da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 15291da177e4SLinus Torvalds conf->r1buf_pool = NULL; 153079ef3a8aSmajianpeng 1531669cc7baSNeilBrown spin_lock_irq(&conf->resync_lock); 1532e8ff8bf0SJes Sorensen conf->next_resync = MaxSector - 2 * NEXT_NORMALIO_DISTANCE; 153379ef3a8aSmajianpeng conf->start_next_window = MaxSector; 1534669cc7baSNeilBrown conf->current_window_requests += 1535669cc7baSNeilBrown conf->next_window_requests; 1536669cc7baSNeilBrown conf->next_window_requests = 0; 1537669cc7baSNeilBrown spin_unlock_irq(&conf->resync_lock); 15381da177e4SLinus Torvalds } 15391da177e4SLinus Torvalds 1540fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 15411da177e4SLinus Torvalds { 15421da177e4SLinus Torvalds int i; 1543e8096360SNeilBrown struct r1conf *conf = mddev->private; 15446b965620SNeilBrown int count = 0; 15456b965620SNeilBrown unsigned long flags; 15461da177e4SLinus Torvalds 15471da177e4SLinus Torvalds /* 15481da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1549ddac7c7eSNeilBrown * and mark them readable. 1550ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 1551423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request 1552423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent. 15531da177e4SLinus Torvalds */ 1554423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 15551da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 15563cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 15578c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 15588c7a2c2bSNeilBrown if (repl 15591aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags) 15608c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 15618c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 15628c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 15638c7a2c2bSNeilBrown /* replacement has just become active */ 15648c7a2c2bSNeilBrown if (!rdev || 15658c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 15668c7a2c2bSNeilBrown count++; 15678c7a2c2bSNeilBrown if (rdev) { 15688c7a2c2bSNeilBrown /* Replaced device not technically 15698c7a2c2bSNeilBrown * faulty, but we need to be sure 15708c7a2c2bSNeilBrown * it gets removed and never re-added 15718c7a2c2bSNeilBrown */ 15728c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 15738c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 15748c7a2c2bSNeilBrown rdev->sysfs_state); 15758c7a2c2bSNeilBrown } 15768c7a2c2bSNeilBrown } 1577ddac7c7eSNeilBrown if (rdev 157861e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector 1579ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1580c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 15816b965620SNeilBrown count++; 1582654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 15831da177e4SLinus Torvalds } 15841da177e4SLinus Torvalds } 15856b965620SNeilBrown mddev->degraded -= count; 15866b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 15871da177e4SLinus Torvalds 15881da177e4SLinus Torvalds print_conf(conf); 15896b965620SNeilBrown return count; 15901da177e4SLinus Torvalds } 15911da177e4SLinus Torvalds 1592fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 15931da177e4SLinus Torvalds { 1594e8096360SNeilBrown struct r1conf *conf = mddev->private; 1595199050eaSNeil Brown int err = -EEXIST; 159641158c7eSNeilBrown int mirror = 0; 15970eaf822cSJonathan Brassow struct raid1_info *p; 15986c2fce2eSNeil Brown int first = 0; 159930194636SNeilBrown int last = conf->raid_disks - 1; 16001da177e4SLinus Torvalds 16015389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 16025389042fSNeilBrown return -EBUSY; 16035389042fSNeilBrown 16041501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev)) 16051501efadSDan Williams return -ENXIO; 16061501efadSDan Williams 16076c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 16086c2fce2eSNeil Brown first = last = rdev->raid_disk; 16096c2fce2eSNeil Brown 161070bcecdbSGoldwyn Rodrigues /* 161170bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk 161270bcecdbSGoldwyn Rodrigues * if possible. 161370bcecdbSGoldwyn Rodrigues */ 161470bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 && 161570bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first && 161670bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL) 161770bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk; 161870bcecdbSGoldwyn Rodrigues 16197ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 16207ef449d1SNeilBrown p = conf->mirrors+mirror; 16217ef449d1SNeilBrown if (!p->rdev) { 16221da177e4SLinus Torvalds 16239092c02dSJonathan Brassow if (mddev->gendisk) 16248f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 16258f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 16261da177e4SLinus Torvalds 16271da177e4SLinus Torvalds p->head_position = 0; 16281da177e4SLinus Torvalds rdev->raid_disk = mirror; 1629199050eaSNeil Brown err = 0; 16306aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 16316aea114aSNeilBrown * if this was recently any drive of the array 16326aea114aSNeilBrown */ 16336aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 163441158c7eSNeilBrown conf->fullsync = 1; 1635d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 16361da177e4SLinus Torvalds break; 16371da177e4SLinus Torvalds } 16387ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 16397ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 16407ef449d1SNeilBrown /* Add this device as a replacement */ 16417ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 16427ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 16437ef449d1SNeilBrown rdev->raid_disk = mirror; 16447ef449d1SNeilBrown err = 0; 16457ef449d1SNeilBrown conf->fullsync = 1; 16467ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 16477ef449d1SNeilBrown break; 16487ef449d1SNeilBrown } 16497ef449d1SNeilBrown } 16509092c02dSJonathan Brassow if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) 16512ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); 16521da177e4SLinus Torvalds print_conf(conf); 1653199050eaSNeil Brown return err; 16541da177e4SLinus Torvalds } 16551da177e4SLinus Torvalds 1656b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 16571da177e4SLinus Torvalds { 1658e8096360SNeilBrown struct r1conf *conf = mddev->private; 16591da177e4SLinus Torvalds int err = 0; 1660b8321b68SNeilBrown int number = rdev->raid_disk; 16610eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 16621da177e4SLinus Torvalds 1663b014f14cSNeilBrown if (rdev != p->rdev) 1664b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1665b014f14cSNeilBrown 16661da177e4SLinus Torvalds print_conf(conf); 1667b8321b68SNeilBrown if (rdev == p->rdev) { 1668b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 16691da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 16701da177e4SLinus Torvalds err = -EBUSY; 16711da177e4SLinus Torvalds goto abort; 16721da177e4SLinus Torvalds } 1673046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1674dfc70645SNeilBrown * is not possible. 1675dfc70645SNeilBrown */ 1676dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 16775389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1678dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1679dfc70645SNeilBrown err = -EBUSY; 1680dfc70645SNeilBrown goto abort; 1681dfc70645SNeilBrown } 16821da177e4SLinus Torvalds p->rdev = NULL; 1683d787be40SNeilBrown if (!test_bit(RemoveSynchronized, &rdev->flags)) { 1684fbd568a3SPaul E. McKenney synchronize_rcu(); 16851da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 16861da177e4SLinus Torvalds /* lost the race, try later */ 16871da177e4SLinus Torvalds err = -EBUSY; 16881da177e4SLinus Torvalds p->rdev = rdev; 1689ac5e7113SAndre Noll goto abort; 1690d787be40SNeilBrown } 1691d787be40SNeilBrown } 1692d787be40SNeilBrown if (conf->mirrors[conf->raid_disks + number].rdev) { 16938c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 16948c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 16958c7a2c2bSNeilBrown * doing this to avoid confusion. 16968c7a2c2bSNeilBrown */ 16978c7a2c2bSNeilBrown struct md_rdev *repl = 16988c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 1699e2d59925SNeilBrown freeze_array(conf, 0); 17008c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 17018c7a2c2bSNeilBrown p->rdev = repl; 17028c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 1703e2d59925SNeilBrown unfreeze_array(conf); 1704b014f14cSNeilBrown clear_bit(WantReplacement, &rdev->flags); 17058c7a2c2bSNeilBrown } else 17068c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1707a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 17081da177e4SLinus Torvalds } 17091da177e4SLinus Torvalds abort: 17101da177e4SLinus Torvalds 17111da177e4SLinus Torvalds print_conf(conf); 17121da177e4SLinus Torvalds return err; 17131da177e4SLinus Torvalds } 17141da177e4SLinus Torvalds 17154246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio) 17161da177e4SLinus Torvalds { 17179f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 17181da177e4SLinus Torvalds 17190fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1720ba3ae3beSNamhyung Kim 17211da177e4SLinus Torvalds /* 17221da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 17231da177e4SLinus Torvalds * or re-read if the read failed. 17241da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 17251da177e4SLinus Torvalds */ 17264246a0b6SChristoph Hellwig if (!bio->bi_error) 17271da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1728d11c171eSNeilBrown 1729d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 17301da177e4SLinus Torvalds reschedule_retry(r1_bio); 17311da177e4SLinus Torvalds } 17321da177e4SLinus Torvalds 17334246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio) 17341da177e4SLinus Torvalds { 17354246a0b6SChristoph Hellwig int uptodate = !bio->bi_error; 17369f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 1737fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1738e8096360SNeilBrown struct r1conf *conf = mddev->private; 17394367af55SNeilBrown sector_t first_bad; 17404367af55SNeilBrown int bad_sectors; 1741854abd75SNeilBrown struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; 1742ba3ae3beSNamhyung Kim 17436b1117d5SNeilBrown if (!uptodate) { 174457dab0bdSNeilBrown sector_t sync_blocks = 0; 17456b1117d5SNeilBrown sector_t s = r1_bio->sector; 17466b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 17476b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 17486b1117d5SNeilBrown do { 17495e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 17506b1117d5SNeilBrown &sync_blocks, 1); 17516b1117d5SNeilBrown s += sync_blocks; 17526b1117d5SNeilBrown sectors_to_go -= sync_blocks; 17536b1117d5SNeilBrown } while (sectors_to_go > 0); 1754854abd75SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1755854abd75SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 175619d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 175719d67169SNeilBrown mddev->recovery); 1758d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 1759854abd75SNeilBrown } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 17603a9f28a5SNeilBrown &first_bad, &bad_sectors) && 17613a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 17623a9f28a5SNeilBrown r1_bio->sector, 17633a9f28a5SNeilBrown r1_bio->sectors, 17643a9f28a5SNeilBrown &first_bad, &bad_sectors) 17653a9f28a5SNeilBrown ) 17664367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1767e3b9703eSNeilBrown 17681da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 17694367af55SNeilBrown int s = r1_bio->sectors; 1770d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1771d8f05d29SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 17724367af55SNeilBrown reschedule_retry(r1_bio); 17734367af55SNeilBrown else { 17741da177e4SLinus Torvalds put_buf(r1_bio); 177573d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 17761da177e4SLinus Torvalds } 17771da177e4SLinus Torvalds } 17784367af55SNeilBrown } 17791da177e4SLinus Torvalds 17803cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1781d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1782d8f05d29SNeilBrown { 1783796a5cf0SMike Christie if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) 1784d8f05d29SNeilBrown /* success */ 1785d8f05d29SNeilBrown return 1; 178619d67169SNeilBrown if (rw == WRITE) { 1787d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 178819d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 178919d67169SNeilBrown &rdev->flags)) 179019d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 179119d67169SNeilBrown rdev->mddev->recovery); 179219d67169SNeilBrown } 1793d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1794d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1795d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1796d8f05d29SNeilBrown return 0; 1797d8f05d29SNeilBrown } 1798d8f05d29SNeilBrown 17999f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 18001da177e4SLinus Torvalds { 1801a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 180269382e85SNeilBrown * good data, much like with normal read errors. Only 1803ddac7c7eSNeilBrown * read into the pages we already have so we don't 180469382e85SNeilBrown * need to re-issue the read request. 180569382e85SNeilBrown * We don't need to freeze the array, because being in an 180669382e85SNeilBrown * active sync request, there is no normal IO, and 180769382e85SNeilBrown * no overlapping syncs. 180806f60385SNeilBrown * We don't need to check is_badblock() again as we 180906f60385SNeilBrown * made sure that anything with a bad block in range 181006f60385SNeilBrown * will have bi_end_io clear. 18111da177e4SLinus Torvalds */ 1812fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1813e8096360SNeilBrown struct r1conf *conf = mddev->private; 1814a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 181569382e85SNeilBrown sector_t sect = r1_bio->sector; 181669382e85SNeilBrown int sectors = r1_bio->sectors; 181769382e85SNeilBrown int idx = 0; 181869382e85SNeilBrown 181969382e85SNeilBrown while(sectors) { 182069382e85SNeilBrown int s = sectors; 182169382e85SNeilBrown int d = r1_bio->read_disk; 182269382e85SNeilBrown int success = 0; 18233cb03002SNeilBrown struct md_rdev *rdev; 182478d7f5f7SNeilBrown int start; 182569382e85SNeilBrown 182669382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 182769382e85SNeilBrown s = PAGE_SIZE >> 9; 182869382e85SNeilBrown do { 182969382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1830ddac7c7eSNeilBrown /* No rcu protection needed here devices 1831ddac7c7eSNeilBrown * can only be removed when no resync is 1832ddac7c7eSNeilBrown * active, and resync is currently active 1833ddac7c7eSNeilBrown */ 183469382e85SNeilBrown rdev = conf->mirrors[d].rdev; 18359d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 183669382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1837796a5cf0SMike Christie REQ_OP_READ, 0, false)) { 183869382e85SNeilBrown success = 1; 183969382e85SNeilBrown break; 184069382e85SNeilBrown } 184169382e85SNeilBrown } 184269382e85SNeilBrown d++; 18438f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 184469382e85SNeilBrown d = 0; 184569382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 184669382e85SNeilBrown 184778d7f5f7SNeilBrown if (!success) { 184878d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 18493a9f28a5SNeilBrown int abort = 0; 18503a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 18513a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 18523a9f28a5SNeilBrown * work just disable and interrupt the recovery. 18533a9f28a5SNeilBrown * Don't fail devices as that won't really help. 18543a9f28a5SNeilBrown */ 18551d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 185678d7f5f7SNeilBrown mdname(mddev), 185778d7f5f7SNeilBrown bdevname(bio->bi_bdev, b), 185878d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 18598f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 18603a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 18613a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 18623a9f28a5SNeilBrown continue; 18633a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 18643a9f28a5SNeilBrown abort = 1; 18653a9f28a5SNeilBrown } 18663a9f28a5SNeilBrown if (abort) { 1867d890fa2bSNeilBrown conf->recovery_disabled = 1868d890fa2bSNeilBrown mddev->recovery_disabled; 18693a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 187078d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 187178d7f5f7SNeilBrown put_buf(r1_bio); 187278d7f5f7SNeilBrown return 0; 187378d7f5f7SNeilBrown } 18743a9f28a5SNeilBrown /* Try next page */ 18753a9f28a5SNeilBrown sectors -= s; 18763a9f28a5SNeilBrown sect += s; 18773a9f28a5SNeilBrown idx++; 18783a9f28a5SNeilBrown continue; 18793a9f28a5SNeilBrown } 188078d7f5f7SNeilBrown 188178d7f5f7SNeilBrown start = d; 188269382e85SNeilBrown /* write it back and re-read */ 188369382e85SNeilBrown while (d != r1_bio->read_disk) { 188469382e85SNeilBrown if (d == 0) 18858f19ccb2SNeilBrown d = conf->raid_disks * 2; 188669382e85SNeilBrown d--; 188769382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 188869382e85SNeilBrown continue; 188969382e85SNeilBrown rdev = conf->mirrors[d].rdev; 1890d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 189169382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1892d8f05d29SNeilBrown WRITE) == 0) { 189378d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 189478d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 18959d3d8011SNamhyung Kim } 1896097426f6SNeilBrown } 1897097426f6SNeilBrown d = start; 1898097426f6SNeilBrown while (d != r1_bio->read_disk) { 1899097426f6SNeilBrown if (d == 0) 19008f19ccb2SNeilBrown d = conf->raid_disks * 2; 1901097426f6SNeilBrown d--; 1902097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 1903097426f6SNeilBrown continue; 1904097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 1905d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 190669382e85SNeilBrown bio->bi_io_vec[idx].bv_page, 1907d8f05d29SNeilBrown READ) != 0) 19089d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 190969382e85SNeilBrown } 191069382e85SNeilBrown sectors -= s; 191169382e85SNeilBrown sect += s; 191269382e85SNeilBrown idx ++; 191369382e85SNeilBrown } 191478d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 19154246a0b6SChristoph Hellwig bio->bi_error = 0; 1916a68e5870SNeilBrown return 1; 191769382e85SNeilBrown } 1918d11c171eSNeilBrown 1919c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio) 1920a68e5870SNeilBrown { 1921a68e5870SNeilBrown /* We have read all readable devices. If we haven't 1922a68e5870SNeilBrown * got the block, then there is no hope left. 1923a68e5870SNeilBrown * If we have, then we want to do a comparison 1924a68e5870SNeilBrown * and skip the write if everything is the same. 1925a68e5870SNeilBrown * If any blocks failed to read, then we need to 1926a68e5870SNeilBrown * attempt an over-write 1927a68e5870SNeilBrown */ 1928fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1929e8096360SNeilBrown struct r1conf *conf = mddev->private; 1930a68e5870SNeilBrown int primary; 1931a68e5870SNeilBrown int i; 1932f4380a91Smajianpeng int vcnt; 1933a68e5870SNeilBrown 193430bc9b53SNeilBrown /* Fix variable parts of all bios */ 193530bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 193630bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 193730bc9b53SNeilBrown int j; 193830bc9b53SNeilBrown int size; 19394246a0b6SChristoph Hellwig int error; 194030bc9b53SNeilBrown struct bio *b = r1_bio->bios[i]; 194130bc9b53SNeilBrown if (b->bi_end_io != end_sync_read) 194230bc9b53SNeilBrown continue; 19434246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */ 19444246a0b6SChristoph Hellwig error = b->bi_error; 194530bc9b53SNeilBrown bio_reset(b); 19464246a0b6SChristoph Hellwig b->bi_error = error; 194730bc9b53SNeilBrown b->bi_vcnt = vcnt; 19484f024f37SKent Overstreet b->bi_iter.bi_size = r1_bio->sectors << 9; 19494f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector + 195030bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset; 195130bc9b53SNeilBrown b->bi_bdev = conf->mirrors[i].rdev->bdev; 195230bc9b53SNeilBrown b->bi_end_io = end_sync_read; 195330bc9b53SNeilBrown b->bi_private = r1_bio; 195430bc9b53SNeilBrown 19554f024f37SKent Overstreet size = b->bi_iter.bi_size; 195630bc9b53SNeilBrown for (j = 0; j < vcnt ; j++) { 195730bc9b53SNeilBrown struct bio_vec *bi; 195830bc9b53SNeilBrown bi = &b->bi_io_vec[j]; 195930bc9b53SNeilBrown bi->bv_offset = 0; 196030bc9b53SNeilBrown if (size > PAGE_SIZE) 196130bc9b53SNeilBrown bi->bv_len = PAGE_SIZE; 196230bc9b53SNeilBrown else 196330bc9b53SNeilBrown bi->bv_len = size; 196430bc9b53SNeilBrown size -= PAGE_SIZE; 196530bc9b53SNeilBrown } 196630bc9b53SNeilBrown } 19678f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 1968a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 19694246a0b6SChristoph Hellwig !r1_bio->bios[primary]->bi_error) { 1970a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 1971a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 1972a68e5870SNeilBrown break; 1973a68e5870SNeilBrown } 1974a68e5870SNeilBrown r1_bio->read_disk = primary; 19758f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 1976a68e5870SNeilBrown int j; 1977a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 1978a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 19794246a0b6SChristoph Hellwig int error = sbio->bi_error; 198078d7f5f7SNeilBrown 19812aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read) 198278d7f5f7SNeilBrown continue; 19834246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */ 19844246a0b6SChristoph Hellwig sbio->bi_error = 0; 1985a68e5870SNeilBrown 19864246a0b6SChristoph Hellwig if (!error) { 1987a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 1988a68e5870SNeilBrown struct page *p, *s; 1989a68e5870SNeilBrown p = pbio->bi_io_vec[j].bv_page; 1990a68e5870SNeilBrown s = sbio->bi_io_vec[j].bv_page; 1991a68e5870SNeilBrown if (memcmp(page_address(p), 1992a68e5870SNeilBrown page_address(s), 19935020ad7dSNeilBrown sbio->bi_io_vec[j].bv_len)) 1994a68e5870SNeilBrown break; 1995a68e5870SNeilBrown } 1996a68e5870SNeilBrown } else 1997a68e5870SNeilBrown j = 0; 1998a68e5870SNeilBrown if (j >= 0) 19997f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); 2000a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 20014246a0b6SChristoph Hellwig && !error)) { 200278d7f5f7SNeilBrown /* No need to write to this device. */ 2003a68e5870SNeilBrown sbio->bi_end_io = NULL; 2004a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 200578d7f5f7SNeilBrown continue; 200678d7f5f7SNeilBrown } 2007d3b45c2aSKent Overstreet 2008d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio); 2009a68e5870SNeilBrown } 2010a68e5870SNeilBrown } 2011a68e5870SNeilBrown 20129f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 2013a68e5870SNeilBrown { 2014e8096360SNeilBrown struct r1conf *conf = mddev->private; 2015a68e5870SNeilBrown int i; 20168f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 2017a68e5870SNeilBrown struct bio *bio, *wbio; 2018a68e5870SNeilBrown 2019a68e5870SNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2020a68e5870SNeilBrown 2021a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2022a68e5870SNeilBrown /* ouch - failed to read all of that. */ 2023a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 2024a68e5870SNeilBrown return; 20257ca78d57SNeilBrown 20267ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2027c95e6385SNeilBrown process_checks(r1_bio); 2028c95e6385SNeilBrown 2029d11c171eSNeilBrown /* 2030d11c171eSNeilBrown * schedule writes 2031d11c171eSNeilBrown */ 20321da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 20331da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 20341da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 20353e198f78SNeilBrown if (wbio->bi_end_io == NULL || 20363e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 20373e198f78SNeilBrown (i == r1_bio->read_disk || 20383e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 20391da177e4SLinus Torvalds continue; 20401da177e4SLinus Torvalds 2041796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 20423e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 20431da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 2044aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); 2045191ea9b2SNeilBrown 20461da177e4SLinus Torvalds generic_make_request(wbio); 20471da177e4SLinus Torvalds } 20481da177e4SLinus Torvalds 20491da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 2050191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 205158e94ae1SNeilBrown int s = r1_bio->sectors; 205258e94ae1SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 205358e94ae1SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 205458e94ae1SNeilBrown reschedule_retry(r1_bio); 205558e94ae1SNeilBrown else { 20561da177e4SLinus Torvalds put_buf(r1_bio); 205758e94ae1SNeilBrown md_done_sync(mddev, s, 1); 205858e94ae1SNeilBrown } 20591da177e4SLinus Torvalds } 20601da177e4SLinus Torvalds } 20611da177e4SLinus Torvalds 20621da177e4SLinus Torvalds /* 20631da177e4SLinus Torvalds * This is a kernel thread which: 20641da177e4SLinus Torvalds * 20651da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 20661da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 2067d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 20681da177e4SLinus Torvalds */ 20691da177e4SLinus Torvalds 2070e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 2071867868fbSNeilBrown sector_t sect, int sectors) 2072867868fbSNeilBrown { 2073fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 2074867868fbSNeilBrown while(sectors) { 2075867868fbSNeilBrown int s = sectors; 2076867868fbSNeilBrown int d = read_disk; 2077867868fbSNeilBrown int success = 0; 2078867868fbSNeilBrown int start; 20793cb03002SNeilBrown struct md_rdev *rdev; 2080867868fbSNeilBrown 2081867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 2082867868fbSNeilBrown s = PAGE_SIZE >> 9; 2083867868fbSNeilBrown 2084867868fbSNeilBrown do { 2085d2eb35acSNeilBrown sector_t first_bad; 2086d2eb35acSNeilBrown int bad_sectors; 2087d2eb35acSNeilBrown 2088707a6a42SNeilBrown rcu_read_lock(); 2089707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2090867868fbSNeilBrown if (rdev && 2091da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 2092da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 2093da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 2094d2eb35acSNeilBrown is_badblock(rdev, sect, s, 2095707a6a42SNeilBrown &first_bad, &bad_sectors) == 0) { 2096707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2097707a6a42SNeilBrown rcu_read_unlock(); 2098707a6a42SNeilBrown if (sync_page_io(rdev, sect, s<<9, 2099796a5cf0SMike Christie conf->tmppage, REQ_OP_READ, 0, false)) 2100867868fbSNeilBrown success = 1; 2101707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2102707a6a42SNeilBrown if (success) 2103707a6a42SNeilBrown break; 2104707a6a42SNeilBrown } else 2105707a6a42SNeilBrown rcu_read_unlock(); 2106867868fbSNeilBrown d++; 21078f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 2108867868fbSNeilBrown d = 0; 2109867868fbSNeilBrown } while (!success && d != read_disk); 2110867868fbSNeilBrown 2111867868fbSNeilBrown if (!success) { 2112d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 21133cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 2114d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 2115d8f05d29SNeilBrown md_error(mddev, rdev); 2116867868fbSNeilBrown break; 2117867868fbSNeilBrown } 2118867868fbSNeilBrown /* write it back and re-read */ 2119867868fbSNeilBrown start = d; 2120867868fbSNeilBrown while (d != read_disk) { 2121867868fbSNeilBrown if (d==0) 21228f19ccb2SNeilBrown d = conf->raid_disks * 2; 2123867868fbSNeilBrown d--; 2124707a6a42SNeilBrown rcu_read_lock(); 2125707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2126867868fbSNeilBrown if (rdev && 2127707a6a42SNeilBrown !test_bit(Faulty, &rdev->flags)) { 2128707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2129707a6a42SNeilBrown rcu_read_unlock(); 2130d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 2131d8f05d29SNeilBrown conf->tmppage, WRITE); 2132707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2133707a6a42SNeilBrown } else 2134707a6a42SNeilBrown rcu_read_unlock(); 2135867868fbSNeilBrown } 2136867868fbSNeilBrown d = start; 2137867868fbSNeilBrown while (d != read_disk) { 2138867868fbSNeilBrown char b[BDEVNAME_SIZE]; 2139867868fbSNeilBrown if (d==0) 21408f19ccb2SNeilBrown d = conf->raid_disks * 2; 2141867868fbSNeilBrown d--; 2142707a6a42SNeilBrown rcu_read_lock(); 2143707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2144867868fbSNeilBrown if (rdev && 2145b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) { 2146707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2147707a6a42SNeilBrown rcu_read_unlock(); 2148d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 2149d8f05d29SNeilBrown conf->tmppage, READ)) { 2150867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 21511d41c216SNeilBrown pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", 2152867868fbSNeilBrown mdname(mddev), s, 2153969b755aSRandy Dunlap (unsigned long long)(sect + 2154969b755aSRandy Dunlap rdev->data_offset), 2155867868fbSNeilBrown bdevname(rdev->bdev, b)); 2156867868fbSNeilBrown } 2157707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2158707a6a42SNeilBrown } else 2159707a6a42SNeilBrown rcu_read_unlock(); 2160867868fbSNeilBrown } 2161867868fbSNeilBrown sectors -= s; 2162867868fbSNeilBrown sect += s; 2163867868fbSNeilBrown } 2164867868fbSNeilBrown } 2165867868fbSNeilBrown 21669f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2167cd5ff9a1SNeilBrown { 2168fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2169e8096360SNeilBrown struct r1conf *conf = mddev->private; 21703cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2171cd5ff9a1SNeilBrown 2172cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2173cd5ff9a1SNeilBrown * we just recently had a write error. 2174cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2175cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2176cd5ff9a1SNeilBrown * a bad block. 2177cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2178cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2179cd5ff9a1SNeilBrown * 2180cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2181cd5ff9a1SNeilBrown */ 2182cd5ff9a1SNeilBrown 2183cd5ff9a1SNeilBrown int block_sectors; 2184cd5ff9a1SNeilBrown sector_t sector; 2185cd5ff9a1SNeilBrown int sectors; 2186cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2187cd5ff9a1SNeilBrown int ok = 1; 2188cd5ff9a1SNeilBrown 2189cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2190cd5ff9a1SNeilBrown return 0; 2191cd5ff9a1SNeilBrown 2192ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift, 2193ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9); 2194cd5ff9a1SNeilBrown sector = r1_bio->sector; 2195cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2196cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2197cd5ff9a1SNeilBrown - sector; 2198cd5ff9a1SNeilBrown 2199cd5ff9a1SNeilBrown while (sect_to_write) { 2200cd5ff9a1SNeilBrown struct bio *wbio; 2201cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2202cd5ff9a1SNeilBrown sectors = sect_to_write; 2203cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2204cd5ff9a1SNeilBrown 2205b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2206b783863fSKent Overstreet unsigned vcnt = r1_bio->behind_page_count; 2207b783863fSKent Overstreet struct bio_vec *vec = r1_bio->behind_bvecs; 2208b783863fSKent Overstreet 2209b783863fSKent Overstreet while (!vec->bv_page) { 2210b783863fSKent Overstreet vec++; 2211b783863fSKent Overstreet vcnt--; 2212b783863fSKent Overstreet } 2213b783863fSKent Overstreet 2214cd5ff9a1SNeilBrown wbio = bio_alloc_mddev(GFP_NOIO, vcnt, mddev); 2215cd5ff9a1SNeilBrown memcpy(wbio->bi_io_vec, vec, vcnt * sizeof(struct bio_vec)); 2216b783863fSKent Overstreet 2217cd5ff9a1SNeilBrown wbio->bi_vcnt = vcnt; 2218b783863fSKent Overstreet } else { 2219b783863fSKent Overstreet wbio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); 2220b783863fSKent Overstreet } 2221b783863fSKent Overstreet 2222796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 22234f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector; 22244f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9; 2225cd5ff9a1SNeilBrown 22266678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors); 22274f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset; 2228cd5ff9a1SNeilBrown wbio->bi_bdev = rdev->bdev; 22294e49ea4aSMike Christie 22304e49ea4aSMike Christie if (submit_bio_wait(wbio) < 0) 2231cd5ff9a1SNeilBrown /* failure! */ 2232cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2233cd5ff9a1SNeilBrown sectors, 0) 2234cd5ff9a1SNeilBrown && ok; 2235cd5ff9a1SNeilBrown 2236cd5ff9a1SNeilBrown bio_put(wbio); 2237cd5ff9a1SNeilBrown sect_to_write -= sectors; 2238cd5ff9a1SNeilBrown sector += sectors; 2239cd5ff9a1SNeilBrown sectors = block_sectors; 2240cd5ff9a1SNeilBrown } 2241cd5ff9a1SNeilBrown return ok; 2242cd5ff9a1SNeilBrown } 2243cd5ff9a1SNeilBrown 2244e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 224562096bceSNeilBrown { 224662096bceSNeilBrown int m; 224762096bceSNeilBrown int s = r1_bio->sectors; 22488f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 22493cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 225062096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 225162096bceSNeilBrown if (bio->bi_end_io == NULL) 225262096bceSNeilBrown continue; 22534246a0b6SChristoph Hellwig if (!bio->bi_error && 225462096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2255c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 225662096bceSNeilBrown } 22574246a0b6SChristoph Hellwig if (bio->bi_error && 225862096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 225962096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 226062096bceSNeilBrown md_error(conf->mddev, rdev); 226162096bceSNeilBrown } 226262096bceSNeilBrown } 226362096bceSNeilBrown put_buf(r1_bio); 226462096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 226562096bceSNeilBrown } 226662096bceSNeilBrown 2267e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 226862096bceSNeilBrown { 226962096bceSNeilBrown int m; 227055ce74d4SNeilBrown bool fail = false; 22718f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 227262096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 22733cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 227462096bceSNeilBrown rdev_clear_badblocks(rdev, 227562096bceSNeilBrown r1_bio->sector, 2276c6563a8cSNeilBrown r1_bio->sectors, 0); 227762096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 227862096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 227962096bceSNeilBrown /* This drive got a write error. We need to 228062096bceSNeilBrown * narrow down and record precise write 228162096bceSNeilBrown * errors. 228262096bceSNeilBrown */ 228355ce74d4SNeilBrown fail = true; 228462096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 228562096bceSNeilBrown md_error(conf->mddev, 228662096bceSNeilBrown conf->mirrors[m].rdev); 228762096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 228862096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 228962096bceSNeilBrown } 229062096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 229162096bceSNeilBrown conf->mddev); 229262096bceSNeilBrown } 229355ce74d4SNeilBrown if (fail) { 229455ce74d4SNeilBrown spin_lock_irq(&conf->device_lock); 229555ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list); 2296ccfc7bf1SNate Dailey conf->nr_queued++; 229755ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock); 229855ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread); 2299bd8688a1SNeilBrown } else { 2300bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2301bd8688a1SNeilBrown close_write(r1_bio); 230262096bceSNeilBrown raid_end_bio_io(r1_bio); 230362096bceSNeilBrown } 2304bd8688a1SNeilBrown } 230562096bceSNeilBrown 2306e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 230762096bceSNeilBrown { 230862096bceSNeilBrown int disk; 230962096bceSNeilBrown int max_sectors; 2310fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 231162096bceSNeilBrown struct bio *bio; 231262096bceSNeilBrown char b[BDEVNAME_SIZE]; 23133cb03002SNeilBrown struct md_rdev *rdev; 2314109e3765SNeilBrown dev_t bio_dev; 2315109e3765SNeilBrown sector_t bio_sector; 231662096bceSNeilBrown 231762096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 231862096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 231962096bceSNeilBrown * the block and we can fix it. 232062096bceSNeilBrown * We freeze all other IO, and try reading the block from 232162096bceSNeilBrown * other devices. When we find one, we re-write 232262096bceSNeilBrown * and check it that fixes the read error. 232362096bceSNeilBrown * This is all done synchronously while the array is 232462096bceSNeilBrown * frozen 232562096bceSNeilBrown */ 23267449f699STomasz Majchrzak 23277449f699STomasz Majchrzak bio = r1_bio->bios[r1_bio->read_disk]; 23287449f699STomasz Majchrzak bdevname(bio->bi_bdev, b); 2329109e3765SNeilBrown bio_dev = bio->bi_bdev->bd_dev; 2330109e3765SNeilBrown bio_sector = conf->mirrors[r1_bio->read_disk].rdev->data_offset + r1_bio->sector; 23317449f699STomasz Majchrzak bio_put(bio); 23327449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = NULL; 23337449f699STomasz Majchrzak 233462096bceSNeilBrown if (mddev->ro == 0) { 2335e2d59925SNeilBrown freeze_array(conf, 1); 233662096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 233762096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 233862096bceSNeilBrown unfreeze_array(conf); 23397449f699STomasz Majchrzak } else { 23407449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; 23417449f699STomasz Majchrzak } 23427449f699STomasz Majchrzak 23437ad4d4a6SNeilBrown rdev_dec_pending(conf->mirrors[r1_bio->read_disk].rdev, conf->mddev); 234462096bceSNeilBrown 234562096bceSNeilBrown read_more: 234662096bceSNeilBrown disk = read_balance(conf, r1_bio, &max_sectors); 234762096bceSNeilBrown if (disk == -1) { 23481d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 234962096bceSNeilBrown mdname(mddev), b, (unsigned long long)r1_bio->sector); 235062096bceSNeilBrown raid_end_bio_io(r1_bio); 235162096bceSNeilBrown } else { 235262096bceSNeilBrown const unsigned long do_sync 23531eff9d32SJens Axboe = r1_bio->master_bio->bi_opf & REQ_SYNC; 235462096bceSNeilBrown r1_bio->read_disk = disk; 235562096bceSNeilBrown bio = bio_clone_mddev(r1_bio->master_bio, GFP_NOIO, mddev); 23564f024f37SKent Overstreet bio_trim(bio, r1_bio->sector - bio->bi_iter.bi_sector, 23574f024f37SKent Overstreet max_sectors); 235862096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = bio; 235962096bceSNeilBrown rdev = conf->mirrors[disk].rdev; 23601d41c216SNeilBrown pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", 236162096bceSNeilBrown mdname(mddev), 236262096bceSNeilBrown (unsigned long long)r1_bio->sector, 236362096bceSNeilBrown bdevname(rdev->bdev, b)); 23644f024f37SKent Overstreet bio->bi_iter.bi_sector = r1_bio->sector + rdev->data_offset; 236562096bceSNeilBrown bio->bi_bdev = rdev->bdev; 236662096bceSNeilBrown bio->bi_end_io = raid1_end_read_request; 2367796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, do_sync); 236862096bceSNeilBrown bio->bi_private = r1_bio; 236962096bceSNeilBrown if (max_sectors < r1_bio->sectors) { 237062096bceSNeilBrown /* Drat - have to split this up more */ 237162096bceSNeilBrown struct bio *mbio = r1_bio->master_bio; 237262096bceSNeilBrown int sectors_handled = (r1_bio->sector + max_sectors 23734f024f37SKent Overstreet - mbio->bi_iter.bi_sector); 237462096bceSNeilBrown r1_bio->sectors = max_sectors; 237562096bceSNeilBrown spin_lock_irq(&conf->device_lock); 237662096bceSNeilBrown if (mbio->bi_phys_segments == 0) 237762096bceSNeilBrown mbio->bi_phys_segments = 2; 237862096bceSNeilBrown else 237962096bceSNeilBrown mbio->bi_phys_segments++; 238062096bceSNeilBrown spin_unlock_irq(&conf->device_lock); 2381109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), 2382109e3765SNeilBrown bio, bio_dev, bio_sector); 238362096bceSNeilBrown generic_make_request(bio); 238462096bceSNeilBrown bio = NULL; 238562096bceSNeilBrown 238662096bceSNeilBrown r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 238762096bceSNeilBrown 238862096bceSNeilBrown r1_bio->master_bio = mbio; 2389aa8b57aaSKent Overstreet r1_bio->sectors = bio_sectors(mbio) - sectors_handled; 239062096bceSNeilBrown r1_bio->state = 0; 239162096bceSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 239262096bceSNeilBrown r1_bio->mddev = mddev; 23934f024f37SKent Overstreet r1_bio->sector = mbio->bi_iter.bi_sector + 23944f024f37SKent Overstreet sectors_handled; 239562096bceSNeilBrown 239662096bceSNeilBrown goto read_more; 2397109e3765SNeilBrown } else { 2398109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), 2399109e3765SNeilBrown bio, bio_dev, bio_sector); 240062096bceSNeilBrown generic_make_request(bio); 240162096bceSNeilBrown } 240262096bceSNeilBrown } 2403109e3765SNeilBrown } 240462096bceSNeilBrown 24054ed8731dSShaohua Li static void raid1d(struct md_thread *thread) 24061da177e4SLinus Torvalds { 24074ed8731dSShaohua Li struct mddev *mddev = thread->mddev; 24089f2c9d12SNeilBrown struct r1bio *r1_bio; 24091da177e4SLinus Torvalds unsigned long flags; 2410e8096360SNeilBrown struct r1conf *conf = mddev->private; 24111da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2412e1dfa0a2SNeilBrown struct blk_plug plug; 24131da177e4SLinus Torvalds 24141da177e4SLinus Torvalds md_check_recovery(mddev); 24151da177e4SLinus Torvalds 241655ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) && 241755ce74d4SNeilBrown !test_bit(MD_CHANGE_PENDING, &mddev->flags)) { 241855ce74d4SNeilBrown LIST_HEAD(tmp); 241955ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 242055ce74d4SNeilBrown if (!test_bit(MD_CHANGE_PENDING, &mddev->flags)) { 2421ccfc7bf1SNate Dailey while (!list_empty(&conf->bio_end_io_list)) { 2422ccfc7bf1SNate Dailey list_move(conf->bio_end_io_list.prev, &tmp); 2423ccfc7bf1SNate Dailey conf->nr_queued--; 2424ccfc7bf1SNate Dailey } 242555ce74d4SNeilBrown } 242655ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 242755ce74d4SNeilBrown while (!list_empty(&tmp)) { 2428a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio, 2429a452744bSMikulas Patocka retry_list); 243055ce74d4SNeilBrown list_del(&r1_bio->retry_list); 2431bd8688a1SNeilBrown if (mddev->degraded) 2432bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 2433bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2434bd8688a1SNeilBrown close_write(r1_bio); 243555ce74d4SNeilBrown raid_end_bio_io(r1_bio); 243655ce74d4SNeilBrown } 243755ce74d4SNeilBrown } 243855ce74d4SNeilBrown 2439e1dfa0a2SNeilBrown blk_start_plug(&plug); 24401da177e4SLinus Torvalds for (;;) { 2441a35e63efSNeilBrown 24427eaceaccSJens Axboe flush_pending_writes(conf); 2443a35e63efSNeilBrown 24441da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2445a35e63efSNeilBrown if (list_empty(head)) { 2446191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 24471da177e4SLinus Torvalds break; 2448a35e63efSNeilBrown } 24499f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 24501da177e4SLinus Torvalds list_del(head->prev); 2451ddaf22abSNeilBrown conf->nr_queued--; 24521da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 24531da177e4SLinus Torvalds 24541da177e4SLinus Torvalds mddev = r1_bio->mddev; 2455070ec55dSNeilBrown conf = mddev->private; 24564367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2457d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 245862096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 245962096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 246062096bceSNeilBrown else 24611da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2462cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 246362096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 246462096bceSNeilBrown handle_write_finished(conf, r1_bio); 246562096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 246662096bceSNeilBrown handle_read_error(conf, r1_bio); 2467d2eb35acSNeilBrown else 2468d2eb35acSNeilBrown /* just a partial read to be scheduled from separate 2469d2eb35acSNeilBrown * context 2470d2eb35acSNeilBrown */ 2471d2eb35acSNeilBrown generic_make_request(r1_bio->bios[r1_bio->read_disk]); 247262096bceSNeilBrown 24731d9d5241SNeilBrown cond_resched(); 2474de393cdeSNeilBrown if (mddev->flags & ~(1<<MD_CHANGE_PENDING)) 2475de393cdeSNeilBrown md_check_recovery(mddev); 24761da177e4SLinus Torvalds } 2477e1dfa0a2SNeilBrown blk_finish_plug(&plug); 24781da177e4SLinus Torvalds } 24791da177e4SLinus Torvalds 2480e8096360SNeilBrown static int init_resync(struct r1conf *conf) 24811da177e4SLinus Torvalds { 24821da177e4SLinus Torvalds int buffs; 24831da177e4SLinus Torvalds 24841da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 24859e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 24861da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 24871da177e4SLinus Torvalds conf->poolinfo); 24881da177e4SLinus Torvalds if (!conf->r1buf_pool) 24891da177e4SLinus Torvalds return -ENOMEM; 24901da177e4SLinus Torvalds conf->next_resync = 0; 24911da177e4SLinus Torvalds return 0; 24921da177e4SLinus Torvalds } 24931da177e4SLinus Torvalds 24941da177e4SLinus Torvalds /* 24951da177e4SLinus Torvalds * perform a "sync" on one "block" 24961da177e4SLinus Torvalds * 24971da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 24981da177e4SLinus Torvalds * requests - conflict with active sync requests. 24991da177e4SLinus Torvalds * 25001da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 25011da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 25021da177e4SLinus Torvalds */ 25031da177e4SLinus Torvalds 2504849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 2505849674e4SShaohua Li int *skipped) 25061da177e4SLinus Torvalds { 2507e8096360SNeilBrown struct r1conf *conf = mddev->private; 25089f2c9d12SNeilBrown struct r1bio *r1_bio; 25091da177e4SLinus Torvalds struct bio *bio; 25101da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 25113e198f78SNeilBrown int disk = -1; 25121da177e4SLinus Torvalds int i; 25133e198f78SNeilBrown int wonly = -1; 25143e198f78SNeilBrown int write_targets = 0, read_targets = 0; 251557dab0bdSNeilBrown sector_t sync_blocks; 2516e3b9703eSNeilBrown int still_degraded = 0; 251706f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 251806f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 25191da177e4SLinus Torvalds 25201da177e4SLinus Torvalds if (!conf->r1buf_pool) 25211da177e4SLinus Torvalds if (init_resync(conf)) 252257afd89fSNeilBrown return 0; 25231da177e4SLinus Torvalds 252458c0fed4SAndre Noll max_sector = mddev->dev_sectors; 25251da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2526191ea9b2SNeilBrown /* If we aborted, we need to abort the 2527191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2528191ea9b2SNeilBrown * only be one in raid1 resync. 2529191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2530191ea9b2SNeilBrown */ 25316a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 25326a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2533191ea9b2SNeilBrown &sync_blocks, 1); 25346a806c51SNeilBrown else /* completed sync */ 2535191ea9b2SNeilBrown conf->fullsync = 0; 25366a806c51SNeilBrown 25376a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 25381da177e4SLinus Torvalds close_sync(conf); 2539c40f341fSGoldwyn Rodrigues 2540c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) { 2541c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0; 2542c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0; 2543c40f341fSGoldwyn Rodrigues } 25441da177e4SLinus Torvalds return 0; 25451da177e4SLinus Torvalds } 25461da177e4SLinus Torvalds 254707d84d10SNeilBrown if (mddev->bitmap == NULL && 254807d84d10SNeilBrown mddev->recovery_cp == MaxSector && 25496394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 255007d84d10SNeilBrown conf->fullsync == 0) { 255107d84d10SNeilBrown *skipped = 1; 255207d84d10SNeilBrown return max_sector - sector_nr; 255307d84d10SNeilBrown } 25546394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 25556394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 25566394cca5SNeilBrown */ 2557e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2558e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2559191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2560191ea9b2SNeilBrown *skipped = 1; 2561191ea9b2SNeilBrown return sync_blocks; 2562191ea9b2SNeilBrown } 256317999be4SNeilBrown 25647ac50447STomasz Majchrzak /* 25657ac50447STomasz Majchrzak * If there is non-resync activity waiting for a turn, then let it 25667ac50447STomasz Majchrzak * though before starting on this new sync request. 25677ac50447STomasz Majchrzak */ 25687ac50447STomasz Majchrzak if (conf->nr_waiting) 25697ac50447STomasz Majchrzak schedule_timeout_uninterruptible(1); 25707ac50447STomasz Majchrzak 2571c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against 2572c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS 2573c40f341fSGoldwyn Rodrigues */ 2574c40f341fSGoldwyn Rodrigues 2575c40f341fSGoldwyn Rodrigues bitmap_cond_end_sync(mddev->bitmap, sector_nr, 2576c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); 25771c4588e9SNeilBrown r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 257817999be4SNeilBrown 2579c2fd4c94SNeilBrown raise_barrier(conf, sector_nr); 25801da177e4SLinus Torvalds 25813e198f78SNeilBrown rcu_read_lock(); 25823e198f78SNeilBrown /* 25833e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 25843e198f78SNeilBrown * we might want to read from a different device. So we 25853e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 25863e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 25873e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 25883e198f78SNeilBrown * is OK. 25893e198f78SNeilBrown */ 25901da177e4SLinus Torvalds 25911da177e4SLinus Torvalds r1_bio->mddev = mddev; 25921da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2593191ea9b2SNeilBrown r1_bio->state = 0; 25941da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 25951da177e4SLinus Torvalds 25968f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 25973cb03002SNeilBrown struct md_rdev *rdev; 25981da177e4SLinus Torvalds bio = r1_bio->bios[i]; 25992aabaa65SKent Overstreet bio_reset(bio); 26001da177e4SLinus Torvalds 26013e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 26023e198f78SNeilBrown if (rdev == NULL || 26033e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 26048f19ccb2SNeilBrown if (i < conf->raid_disks) 2605e3b9703eSNeilBrown still_degraded = 1; 26063e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 2607796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 26081da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 26091da177e4SLinus Torvalds write_targets ++; 26103e198f78SNeilBrown } else { 26113e198f78SNeilBrown /* may need to read from here */ 261206f60385SNeilBrown sector_t first_bad = MaxSector; 261306f60385SNeilBrown int bad_sectors; 261406f60385SNeilBrown 261506f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 261606f60385SNeilBrown &first_bad, &bad_sectors)) { 261706f60385SNeilBrown if (first_bad > sector_nr) 261806f60385SNeilBrown good_sectors = first_bad - sector_nr; 261906f60385SNeilBrown else { 262006f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 262106f60385SNeilBrown if (min_bad == 0 || 262206f60385SNeilBrown min_bad > bad_sectors) 262306f60385SNeilBrown min_bad = bad_sectors; 262406f60385SNeilBrown } 262506f60385SNeilBrown } 262606f60385SNeilBrown if (sector_nr < first_bad) { 26273e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 26283e198f78SNeilBrown if (wonly < 0) 26293e198f78SNeilBrown wonly = i; 26303e198f78SNeilBrown } else { 26313e198f78SNeilBrown if (disk < 0) 26323e198f78SNeilBrown disk = i; 26333e198f78SNeilBrown } 2634796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, 0); 263506f60385SNeilBrown bio->bi_end_io = end_sync_read; 26363e198f78SNeilBrown read_targets++; 2637d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) && 2638d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 2639d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 2640d57368afSAlexander Lyakas /* 2641d57368afSAlexander Lyakas * The device is suitable for reading (InSync), 2642d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them, 2643d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave 2644d57368afSAlexander Lyakas * this device alone for this sync request. 2645d57368afSAlexander Lyakas */ 2646796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 2647d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write; 2648d57368afSAlexander Lyakas write_targets++; 26493e198f78SNeilBrown } 265006f60385SNeilBrown } 265106f60385SNeilBrown if (bio->bi_end_io) { 26523e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 26534f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; 26543e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 26551da177e4SLinus Torvalds bio->bi_private = r1_bio; 26561da177e4SLinus Torvalds } 265706f60385SNeilBrown } 26583e198f78SNeilBrown rcu_read_unlock(); 26593e198f78SNeilBrown if (disk < 0) 26603e198f78SNeilBrown disk = wonly; 26613e198f78SNeilBrown r1_bio->read_disk = disk; 2662191ea9b2SNeilBrown 266306f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 266406f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 266506f60385SNeilBrown * need to mark them bad on all write targets 266606f60385SNeilBrown */ 266706f60385SNeilBrown int ok = 1; 26688f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 266906f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2670a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 267106f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 267206f60385SNeilBrown min_bad, 0 267306f60385SNeilBrown ) && ok; 267406f60385SNeilBrown } 267506f60385SNeilBrown set_bit(MD_CHANGE_DEVS, &mddev->flags); 267606f60385SNeilBrown *skipped = 1; 267706f60385SNeilBrown put_buf(r1_bio); 267806f60385SNeilBrown 267906f60385SNeilBrown if (!ok) { 268006f60385SNeilBrown /* Cannot record the badblocks, so need to 268106f60385SNeilBrown * abort the resync. 268206f60385SNeilBrown * If there are multiple read targets, could just 268306f60385SNeilBrown * fail the really bad ones ??? 268406f60385SNeilBrown */ 268506f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 268606f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 268706f60385SNeilBrown return 0; 268806f60385SNeilBrown } else 268906f60385SNeilBrown return min_bad; 269006f60385SNeilBrown 269106f60385SNeilBrown } 269206f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 269306f60385SNeilBrown /* only resync enough to reach the next bad->good 269406f60385SNeilBrown * transition */ 269506f60385SNeilBrown good_sectors = min_bad; 269606f60385SNeilBrown } 269706f60385SNeilBrown 26983e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 26993e198f78SNeilBrown /* extra read targets are also write targets */ 27003e198f78SNeilBrown write_targets += read_targets-1; 27013e198f78SNeilBrown 27023e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 27031da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 27041da177e4SLinus Torvalds * drives must be failed - so we are finished 27051da177e4SLinus Torvalds */ 2706b7219ccbSNeilBrown sector_t rv; 2707b7219ccbSNeilBrown if (min_bad > 0) 2708b7219ccbSNeilBrown max_sector = sector_nr + min_bad; 2709b7219ccbSNeilBrown rv = max_sector - sector_nr; 271057afd89fSNeilBrown *skipped = 1; 27111da177e4SLinus Torvalds put_buf(r1_bio); 27121da177e4SLinus Torvalds return rv; 27131da177e4SLinus Torvalds } 27141da177e4SLinus Torvalds 2715c6207277SNeilBrown if (max_sector > mddev->resync_max) 2716c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 271706f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 271806f60385SNeilBrown max_sector = sector_nr + good_sectors; 27191da177e4SLinus Torvalds nr_sectors = 0; 2720289e99e8SNeilBrown sync_blocks = 0; 27211da177e4SLinus Torvalds do { 27221da177e4SLinus Torvalds struct page *page; 27231da177e4SLinus Torvalds int len = PAGE_SIZE; 27241da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 27251da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 27261da177e4SLinus Torvalds if (len == 0) 27271da177e4SLinus Torvalds break; 2728ab7a30c7SNeilBrown if (sync_blocks == 0) { 27296a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 2730e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2731e5de485fSNeilBrown !conf->fullsync && 2732e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2733191ea9b2SNeilBrown break; 27347571ae88SNeilBrown if ((len >> 9) > sync_blocks) 27356a806c51SNeilBrown len = sync_blocks<<9; 2736ab7a30c7SNeilBrown } 2737191ea9b2SNeilBrown 27388f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 27391da177e4SLinus Torvalds bio = r1_bio->bios[i]; 27401da177e4SLinus Torvalds if (bio->bi_end_io) { 2741d11c171eSNeilBrown page = bio->bi_io_vec[bio->bi_vcnt].bv_page; 27421da177e4SLinus Torvalds if (bio_add_page(bio, page, len, 0) == 0) { 27431da177e4SLinus Torvalds /* stop here */ 2744d11c171eSNeilBrown bio->bi_io_vec[bio->bi_vcnt].bv_page = page; 27451da177e4SLinus Torvalds while (i > 0) { 27461da177e4SLinus Torvalds i--; 27471da177e4SLinus Torvalds bio = r1_bio->bios[i]; 27486a806c51SNeilBrown if (bio->bi_end_io==NULL) 27496a806c51SNeilBrown continue; 27501da177e4SLinus Torvalds /* remove last page from this bio */ 27511da177e4SLinus Torvalds bio->bi_vcnt--; 27524f024f37SKent Overstreet bio->bi_iter.bi_size -= len; 2753b7c44ed9SJens Axboe bio_clear_flag(bio, BIO_SEG_VALID); 27541da177e4SLinus Torvalds } 27551da177e4SLinus Torvalds goto bio_full; 27561da177e4SLinus Torvalds } 27571da177e4SLinus Torvalds } 27581da177e4SLinus Torvalds } 27591da177e4SLinus Torvalds nr_sectors += len>>9; 27601da177e4SLinus Torvalds sector_nr += len>>9; 2761191ea9b2SNeilBrown sync_blocks -= (len>>9); 27621da177e4SLinus Torvalds } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); 27631da177e4SLinus Torvalds bio_full: 27641da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 27651da177e4SLinus Torvalds 2766c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) && 2767c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) { 2768c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed; 2769c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; 2770c40f341fSGoldwyn Rodrigues /* Send resync message */ 2771c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev, 2772c40f341fSGoldwyn Rodrigues conf->cluster_sync_low, 2773c40f341fSGoldwyn Rodrigues conf->cluster_sync_high); 2774c40f341fSGoldwyn Rodrigues } 2775c40f341fSGoldwyn Rodrigues 2776d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2777d11c171eSNeilBrown * compare 2778d11c171eSNeilBrown */ 2779d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2780d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 27812d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2782d11c171eSNeilBrown bio = r1_bio->bios[i]; 2783d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 27842d4f4f33SNeilBrown read_targets--; 2785ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 27861da177e4SLinus Torvalds generic_make_request(bio); 2787d11c171eSNeilBrown } 2788d11c171eSNeilBrown } 2789d11c171eSNeilBrown } else { 2790d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2791d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2792ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 2793d11c171eSNeilBrown generic_make_request(bio); 2794d11c171eSNeilBrown 2795d11c171eSNeilBrown } 27961da177e4SLinus Torvalds return nr_sectors; 27971da177e4SLinus Torvalds } 27981da177e4SLinus Torvalds 2799fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 280080c3a6ceSDan Williams { 280180c3a6ceSDan Williams if (sectors) 280280c3a6ceSDan Williams return sectors; 280380c3a6ceSDan Williams 280480c3a6ceSDan Williams return mddev->dev_sectors; 280580c3a6ceSDan Williams } 280680c3a6ceSDan Williams 2807e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 28081da177e4SLinus Torvalds { 2809e8096360SNeilBrown struct r1conf *conf; 2810709ae487SNeilBrown int i; 28110eaf822cSJonathan Brassow struct raid1_info *disk; 28123cb03002SNeilBrown struct md_rdev *rdev; 2813709ae487SNeilBrown int err = -ENOMEM; 28141da177e4SLinus Torvalds 2815e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 28161da177e4SLinus Torvalds if (!conf) 2817709ae487SNeilBrown goto abort; 28181da177e4SLinus Torvalds 28190eaf822cSJonathan Brassow conf->mirrors = kzalloc(sizeof(struct raid1_info) 28208f19ccb2SNeilBrown * mddev->raid_disks * 2, 28211da177e4SLinus Torvalds GFP_KERNEL); 28221da177e4SLinus Torvalds if (!conf->mirrors) 2823709ae487SNeilBrown goto abort; 28241da177e4SLinus Torvalds 2825ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2826ddaf22abSNeilBrown if (!conf->tmppage) 2827709ae487SNeilBrown goto abort; 2828ddaf22abSNeilBrown 2829709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 28301da177e4SLinus Torvalds if (!conf->poolinfo) 2831709ae487SNeilBrown goto abort; 28328f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 28331da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 28341da177e4SLinus Torvalds r1bio_pool_free, 28351da177e4SLinus Torvalds conf->poolinfo); 28361da177e4SLinus Torvalds if (!conf->r1bio_pool) 2837709ae487SNeilBrown goto abort; 2838709ae487SNeilBrown 2839ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 28401da177e4SLinus Torvalds 2841c19d5798SNeilBrown err = -EINVAL; 2842e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 2843dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 2844aba336bdSNeilBrown struct request_queue *q; 2845709ae487SNeilBrown int disk_idx = rdev->raid_disk; 28461da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 28471da177e4SLinus Torvalds || disk_idx < 0) 28481da177e4SLinus Torvalds continue; 2849c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 285002b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx; 2851c19d5798SNeilBrown else 28521da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 28531da177e4SLinus Torvalds 2854c19d5798SNeilBrown if (disk->rdev) 2855c19d5798SNeilBrown goto abort; 28561da177e4SLinus Torvalds disk->rdev = rdev; 2857aba336bdSNeilBrown q = bdev_get_queue(rdev->bdev); 28581da177e4SLinus Torvalds 28591da177e4SLinus Torvalds disk->head_position = 0; 286012cee5a8SShaohua Li disk->seq_start = MaxSector; 28611da177e4SLinus Torvalds } 28621da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 28631da177e4SLinus Torvalds conf->mddev = mddev; 28641da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 286555ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list); 28661da177e4SLinus Torvalds 28671da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 286817999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 28691da177e4SLinus Torvalds 2870191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 287134db0cd6SNeilBrown conf->pending_count = 0; 2872d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 2873191ea9b2SNeilBrown 287479ef3a8aSmajianpeng conf->start_next_window = MaxSector; 287579ef3a8aSmajianpeng conf->current_window_requests = conf->next_window_requests = 0; 287679ef3a8aSmajianpeng 2877c19d5798SNeilBrown err = -EIO; 28788f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 28791da177e4SLinus Torvalds 28801da177e4SLinus Torvalds disk = conf->mirrors + i; 28811da177e4SLinus Torvalds 2882c19d5798SNeilBrown if (i < conf->raid_disks && 2883c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 2884c19d5798SNeilBrown /* This slot has a replacement. */ 2885c19d5798SNeilBrown if (!disk->rdev) { 2886c19d5798SNeilBrown /* No original, just make the replacement 2887c19d5798SNeilBrown * a recovering spare 2888c19d5798SNeilBrown */ 2889c19d5798SNeilBrown disk->rdev = 2890c19d5798SNeilBrown disk[conf->raid_disks].rdev; 2891c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 2892c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 2893c19d5798SNeilBrown /* Original is not in_sync - bad */ 2894c19d5798SNeilBrown goto abort; 2895c19d5798SNeilBrown } 2896c19d5798SNeilBrown 28975fd6c1dcSNeilBrown if (!disk->rdev || 28985fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 28991da177e4SLinus Torvalds disk->head_position = 0; 29004f0a5e01SJonathan Brassow if (disk->rdev && 29014f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 290217571284SNeilBrown conf->fullsync = 1; 2903be4d3280SShaohua Li } 29041da177e4SLinus Torvalds } 2905709ae487SNeilBrown 2906709ae487SNeilBrown err = -ENOMEM; 29070232605dSNeilBrown conf->thread = md_register_thread(raid1d, mddev, "raid1"); 29081d41c216SNeilBrown if (!conf->thread) 2909709ae487SNeilBrown goto abort; 2910191ea9b2SNeilBrown 2911709ae487SNeilBrown return conf; 2912709ae487SNeilBrown 2913709ae487SNeilBrown abort: 2914709ae487SNeilBrown if (conf) { 2915709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 2916709ae487SNeilBrown kfree(conf->mirrors); 2917709ae487SNeilBrown safe_put_page(conf->tmppage); 2918709ae487SNeilBrown kfree(conf->poolinfo); 2919709ae487SNeilBrown kfree(conf); 2920709ae487SNeilBrown } 2921709ae487SNeilBrown return ERR_PTR(err); 2922709ae487SNeilBrown } 2923709ae487SNeilBrown 2924afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv); 2925849674e4SShaohua Li static int raid1_run(struct mddev *mddev) 2926709ae487SNeilBrown { 2927e8096360SNeilBrown struct r1conf *conf; 2928709ae487SNeilBrown int i; 29293cb03002SNeilBrown struct md_rdev *rdev; 29305220ea1eSmajianpeng int ret; 29312ff8cc2cSShaohua Li bool discard_supported = false; 2932709ae487SNeilBrown 2933709ae487SNeilBrown if (mddev->level != 1) { 29341d41c216SNeilBrown pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", 2935709ae487SNeilBrown mdname(mddev), mddev->level); 2936709ae487SNeilBrown return -EIO; 2937709ae487SNeilBrown } 2938709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 29391d41c216SNeilBrown pr_warn("md/raid1:%s: reshape_position set but not supported\n", 2940709ae487SNeilBrown mdname(mddev)); 2941709ae487SNeilBrown return -EIO; 2942709ae487SNeilBrown } 2943709ae487SNeilBrown /* 2944709ae487SNeilBrown * copy the already verified devices into our private RAID1 2945709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 2946afa0f557SNeilBrown * should be freed in raid1_free()] 2947709ae487SNeilBrown */ 2948709ae487SNeilBrown if (mddev->private == NULL) 2949709ae487SNeilBrown conf = setup_conf(mddev); 2950709ae487SNeilBrown else 2951709ae487SNeilBrown conf = mddev->private; 2952709ae487SNeilBrown 2953709ae487SNeilBrown if (IS_ERR(conf)) 2954709ae487SNeilBrown return PTR_ERR(conf); 2955709ae487SNeilBrown 2956c8dc9c65SJoe Lawrence if (mddev->queue) 29575026d7a9SH. Peter Anvin blk_queue_max_write_same_sectors(mddev->queue, 0); 29585026d7a9SH. Peter Anvin 2959dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 29601ed7242eSJonathan Brassow if (!mddev->gendisk) 29611ed7242eSJonathan Brassow continue; 2962709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 2963709ae487SNeilBrown rdev->data_offset << 9); 29642ff8cc2cSShaohua Li if (blk_queue_discard(bdev_get_queue(rdev->bdev))) 29652ff8cc2cSShaohua Li discard_supported = true; 2966709ae487SNeilBrown } 2967709ae487SNeilBrown 2968709ae487SNeilBrown mddev->degraded = 0; 2969709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 2970709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 2971709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 2972709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 2973709ae487SNeilBrown mddev->degraded++; 2974709ae487SNeilBrown 2975709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 2976709ae487SNeilBrown mddev->recovery_cp = MaxSector; 2977709ae487SNeilBrown 29788c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 29791d41c216SNeilBrown pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", 29808c6ac868SAndre Noll mdname(mddev)); 29811d41c216SNeilBrown pr_info("md/raid1:%s: active with %d out of %d mirrors\n", 29821da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 29831da177e4SLinus Torvalds mddev->raid_disks); 2984709ae487SNeilBrown 29851da177e4SLinus Torvalds /* 29861da177e4SLinus Torvalds * Ok, everything is just fine now 29871da177e4SLinus Torvalds */ 2988709ae487SNeilBrown mddev->thread = conf->thread; 2989709ae487SNeilBrown conf->thread = NULL; 2990709ae487SNeilBrown mddev->private = conf; 2991709ae487SNeilBrown 29921f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 29931da177e4SLinus Torvalds 29941ed7242eSJonathan Brassow if (mddev->queue) { 29952ff8cc2cSShaohua Li if (discard_supported) 29962ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, 29972ff8cc2cSShaohua Li mddev->queue); 29982ff8cc2cSShaohua Li else 29992ff8cc2cSShaohua Li queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, 30002ff8cc2cSShaohua Li mddev->queue); 30011ed7242eSJonathan Brassow } 30025220ea1eSmajianpeng 30035220ea1eSmajianpeng ret = md_integrity_register(mddev); 30045aa61f42SNeilBrown if (ret) { 30055aa61f42SNeilBrown md_unregister_thread(&mddev->thread); 3006afa0f557SNeilBrown raid1_free(mddev, conf); 30075aa61f42SNeilBrown } 30085220ea1eSmajianpeng return ret; 30091da177e4SLinus Torvalds } 30101da177e4SLinus Torvalds 3011afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv) 30121da177e4SLinus Torvalds { 3013afa0f557SNeilBrown struct r1conf *conf = priv; 30144b6d287fSNeilBrown 30151da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 30161da177e4SLinus Torvalds kfree(conf->mirrors); 30170fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage); 30181da177e4SLinus Torvalds kfree(conf->poolinfo); 30191da177e4SLinus Torvalds kfree(conf); 30201da177e4SLinus Torvalds } 30211da177e4SLinus Torvalds 3022fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 30231da177e4SLinus Torvalds { 30241da177e4SLinus Torvalds /* no resync is happening, and there is enough space 30251da177e4SLinus Torvalds * on all devices, so we can resize. 30261da177e4SLinus Torvalds * We need to make sure resync covers any new space. 30271da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 30281da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 30291da177e4SLinus Torvalds * worth it. 30301da177e4SLinus Torvalds */ 3031a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 3032a4a6125aSNeilBrown if (mddev->external_size && 3033a4a6125aSNeilBrown mddev->array_sectors > newsize) 3034b522adcdSDan Williams return -EINVAL; 3035a4a6125aSNeilBrown if (mddev->bitmap) { 3036a4a6125aSNeilBrown int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); 3037a4a6125aSNeilBrown if (ret) 3038a4a6125aSNeilBrown return ret; 3039a4a6125aSNeilBrown } 3040a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 3041f233ea5cSAndre Noll set_capacity(mddev->gendisk, mddev->array_sectors); 3042449aad3eSNeilBrown revalidate_disk(mddev->gendisk); 3043b522adcdSDan Williams if (sectors > mddev->dev_sectors && 3044b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 304558c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 30461da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 30471da177e4SLinus Torvalds } 3048b522adcdSDan Williams mddev->dev_sectors = sectors; 30494b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 30501da177e4SLinus Torvalds return 0; 30511da177e4SLinus Torvalds } 30521da177e4SLinus Torvalds 3053fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 30541da177e4SLinus Torvalds { 30551da177e4SLinus Torvalds /* We need to: 30561da177e4SLinus Torvalds * 1/ resize the r1bio_pool 30571da177e4SLinus Torvalds * 2/ resize conf->mirrors 30581da177e4SLinus Torvalds * 30591da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 30601da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 30611da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 30626ea9c07cSNeilBrown * 30636ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 30646ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 30651da177e4SLinus Torvalds */ 30661da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 30671da177e4SLinus Torvalds struct pool_info *newpoolinfo; 30680eaf822cSJonathan Brassow struct raid1_info *newmirrors; 3069e8096360SNeilBrown struct r1conf *conf = mddev->private; 307063c70c4fSNeilBrown int cnt, raid_disks; 3071c04be0aaSNeilBrown unsigned long flags; 3072b5470dc5SDan Williams int d, d2, err; 30731da177e4SLinus Torvalds 307463c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 3075664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 307663c70c4fSNeilBrown mddev->layout != mddev->new_layout || 307763c70c4fSNeilBrown mddev->level != mddev->new_level) { 3078664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 307963c70c4fSNeilBrown mddev->new_layout = mddev->layout; 308063c70c4fSNeilBrown mddev->new_level = mddev->level; 308163c70c4fSNeilBrown return -EINVAL; 308263c70c4fSNeilBrown } 308363c70c4fSNeilBrown 308428c1b9fdSGoldwyn Rodrigues if (!mddev_is_clustered(mddev)) { 3085b5470dc5SDan Williams err = md_allow_write(mddev); 3086b5470dc5SDan Williams if (err) 3087b5470dc5SDan Williams return err; 308828c1b9fdSGoldwyn Rodrigues } 30892a2275d6SNeilBrown 309063c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 309163c70c4fSNeilBrown 30926ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 30936ea9c07cSNeilBrown cnt=0; 30946ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 30951da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 30966ea9c07cSNeilBrown cnt++; 30976ea9c07cSNeilBrown if (cnt > raid_disks) 30981da177e4SLinus Torvalds return -EBUSY; 30996ea9c07cSNeilBrown } 31001da177e4SLinus Torvalds 31011da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 31021da177e4SLinus Torvalds if (!newpoolinfo) 31031da177e4SLinus Torvalds return -ENOMEM; 31041da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 31058f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 31061da177e4SLinus Torvalds 31071da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 31081da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 31091da177e4SLinus Torvalds if (!newpool) { 31101da177e4SLinus Torvalds kfree(newpoolinfo); 31111da177e4SLinus Torvalds return -ENOMEM; 31121da177e4SLinus Torvalds } 31130eaf822cSJonathan Brassow newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, 31148f19ccb2SNeilBrown GFP_KERNEL); 31151da177e4SLinus Torvalds if (!newmirrors) { 31161da177e4SLinus Torvalds kfree(newpoolinfo); 31171da177e4SLinus Torvalds mempool_destroy(newpool); 31181da177e4SLinus Torvalds return -ENOMEM; 31191da177e4SLinus Torvalds } 31201da177e4SLinus Torvalds 3121e2d59925SNeilBrown freeze_array(conf, 0); 31221da177e4SLinus Torvalds 31231da177e4SLinus Torvalds /* ok, everything is stopped */ 31241da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 31251da177e4SLinus Torvalds conf->r1bio_pool = newpool; 31266ea9c07cSNeilBrown 3127a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 31283cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 3129a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 313036fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 3131a88aa786SNeilBrown rdev->raid_disk = d2; 313236fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 313336fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 31341d41c216SNeilBrown pr_warn("md/raid1:%s: cannot register rd%d\n", 313536fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 3136a88aa786SNeilBrown } 3137a88aa786SNeilBrown if (rdev) 3138a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 31396ea9c07cSNeilBrown } 31401da177e4SLinus Torvalds kfree(conf->mirrors); 31411da177e4SLinus Torvalds conf->mirrors = newmirrors; 31421da177e4SLinus Torvalds kfree(conf->poolinfo); 31431da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 31441da177e4SLinus Torvalds 3145c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 31461da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 3147c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 31481da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 314963c70c4fSNeilBrown mddev->delta_disks = 0; 31501da177e4SLinus Torvalds 3151e2d59925SNeilBrown unfreeze_array(conf); 31521da177e4SLinus Torvalds 3153985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 31541da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 31551da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 31561da177e4SLinus Torvalds 31571da177e4SLinus Torvalds mempool_destroy(oldpool); 31581da177e4SLinus Torvalds return 0; 31591da177e4SLinus Torvalds } 31601da177e4SLinus Torvalds 3161fd01b88cSNeilBrown static void raid1_quiesce(struct mddev *mddev, int state) 316236fa3063SNeilBrown { 3163e8096360SNeilBrown struct r1conf *conf = mddev->private; 316436fa3063SNeilBrown 316536fa3063SNeilBrown switch(state) { 31666eef4b21SNeilBrown case 2: /* wake for suspend */ 31676eef4b21SNeilBrown wake_up(&conf->wait_barrier); 31686eef4b21SNeilBrown break; 31699e6603daSNeilBrown case 1: 317007169fd4Smajianpeng freeze_array(conf, 0); 317136fa3063SNeilBrown break; 31729e6603daSNeilBrown case 0: 317307169fd4Smajianpeng unfreeze_array(conf); 317436fa3063SNeilBrown break; 317536fa3063SNeilBrown } 317636fa3063SNeilBrown } 317736fa3063SNeilBrown 3178fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 3179709ae487SNeilBrown { 3180709ae487SNeilBrown /* raid1 can take over: 3181709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 3182709ae487SNeilBrown */ 3183709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 3184e8096360SNeilBrown struct r1conf *conf; 3185709ae487SNeilBrown mddev->new_level = 1; 3186709ae487SNeilBrown mddev->new_layout = 0; 3187709ae487SNeilBrown mddev->new_chunk_sectors = 0; 3188709ae487SNeilBrown conf = setup_conf(mddev); 3189709ae487SNeilBrown if (!IS_ERR(conf)) 319007169fd4Smajianpeng /* Array must appear to be quiesced */ 319107169fd4Smajianpeng conf->array_frozen = 1; 3192709ae487SNeilBrown return conf; 3193709ae487SNeilBrown } 3194709ae487SNeilBrown return ERR_PTR(-EINVAL); 3195709ae487SNeilBrown } 31961da177e4SLinus Torvalds 319784fc4b56SNeilBrown static struct md_personality raid1_personality = 31981da177e4SLinus Torvalds { 31991da177e4SLinus Torvalds .name = "raid1", 32002604b703SNeilBrown .level = 1, 32011da177e4SLinus Torvalds .owner = THIS_MODULE, 3202849674e4SShaohua Li .make_request = raid1_make_request, 3203849674e4SShaohua Li .run = raid1_run, 3204afa0f557SNeilBrown .free = raid1_free, 3205849674e4SShaohua Li .status = raid1_status, 3206849674e4SShaohua Li .error_handler = raid1_error, 32071da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 32081da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 32091da177e4SLinus Torvalds .spare_active = raid1_spare_active, 3210849674e4SShaohua Li .sync_request = raid1_sync_request, 32111da177e4SLinus Torvalds .resize = raid1_resize, 321280c3a6ceSDan Williams .size = raid1_size, 321363c70c4fSNeilBrown .check_reshape = raid1_reshape, 321436fa3063SNeilBrown .quiesce = raid1_quiesce, 3215709ae487SNeilBrown .takeover = raid1_takeover, 32165c675f83SNeilBrown .congested = raid1_congested, 32171da177e4SLinus Torvalds }; 32181da177e4SLinus Torvalds 32191da177e4SLinus Torvalds static int __init raid_init(void) 32201da177e4SLinus Torvalds { 32212604b703SNeilBrown return register_md_personality(&raid1_personality); 32221da177e4SLinus Torvalds } 32231da177e4SLinus Torvalds 32241da177e4SLinus Torvalds static void raid_exit(void) 32251da177e4SLinus Torvalds { 32262604b703SNeilBrown unregister_md_personality(&raid1_personality); 32271da177e4SLinus Torvalds } 32281da177e4SLinus Torvalds 32291da177e4SLinus Torvalds module_init(raid_init); 32301da177e4SLinus Torvalds module_exit(raid_exit); 32311da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 32320efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 32331da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3234d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 32352604b703SNeilBrown MODULE_ALIAS("md-level-1"); 323634db0cd6SNeilBrown 323734db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 3238