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> 403f07c014SIngo Molnar #include <linux/sched/signal.h> 413f07c014SIngo Molnar 42109e3765SNeilBrown #include <trace/events/block.h> 433f07c014SIngo Molnar 4443b2e5d8SNeilBrown #include "md.h" 45ef740c37SChristoph Hellwig #include "raid1.h" 46ef740c37SChristoph Hellwig #include "bitmap.h" 47191ea9b2SNeilBrown 48394ed8e4SShaohua Li #define UNSUPPORTED_MDDEV_FLAGS \ 49394ed8e4SShaohua Li ((1L << MD_HAS_JOURNAL) | \ 50ea0213e0SArtur Paszkiewicz (1L << MD_JOURNAL_CLEAN) | \ 51ea0213e0SArtur Paszkiewicz (1L << MD_HAS_PPL)) 52394ed8e4SShaohua Li 531da177e4SLinus Torvalds /* 541da177e4SLinus Torvalds * Number of guaranteed r1bios in case of extreme VM load: 551da177e4SLinus Torvalds */ 561da177e4SLinus Torvalds #define NR_RAID1_BIOS 256 571da177e4SLinus Torvalds 58473e87ceSJonathan Brassow /* when we get a read error on a read-only array, we redirect to another 59473e87ceSJonathan Brassow * device without failing the first device, or trying to over-write to 60473e87ceSJonathan Brassow * correct the read error. To keep track of bad blocks on a per-bio 61473e87ceSJonathan Brassow * level, we store IO_BLOCKED in the appropriate 'bios' pointer 62473e87ceSJonathan Brassow */ 63473e87ceSJonathan Brassow #define IO_BLOCKED ((struct bio *)1) 64473e87ceSJonathan Brassow /* When we successfully write to a known bad-block, we need to remove the 65473e87ceSJonathan Brassow * bad-block marking which must be done from process context. So we record 66473e87ceSJonathan Brassow * the success by setting devs[n].bio to IO_MADE_GOOD 67473e87ceSJonathan Brassow */ 68473e87ceSJonathan Brassow #define IO_MADE_GOOD ((struct bio *)2) 69473e87ceSJonathan Brassow 70473e87ceSJonathan Brassow #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) 71473e87ceSJonathan Brassow 7234db0cd6SNeilBrown /* When there are this many requests queue to be written by 7334db0cd6SNeilBrown * the raid1 thread, we become 'congested' to provide back-pressure 7434db0cd6SNeilBrown * for writeback. 7534db0cd6SNeilBrown */ 7634db0cd6SNeilBrown static int max_queued_requests = 1024; 771da177e4SLinus Torvalds 78fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr); 79fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr); 801da177e4SLinus Torvalds 81578b54adSNeilBrown #define raid1_log(md, fmt, args...) \ 82578b54adSNeilBrown do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0) 83578b54adSNeilBrown 8498d30c58SMing Lei /* 8598d30c58SMing Lei * 'strct resync_pages' stores actual pages used for doing the resync 8698d30c58SMing Lei * IO, and it is per-bio, so make .bi_private points to it. 8798d30c58SMing Lei */ 8898d30c58SMing Lei static inline struct resync_pages *get_resync_pages(struct bio *bio) 8998d30c58SMing Lei { 9098d30c58SMing Lei return bio->bi_private; 9198d30c58SMing Lei } 9298d30c58SMing Lei 9398d30c58SMing Lei /* 9498d30c58SMing Lei * for resync bio, r1bio pointer can be retrieved from the per-bio 9598d30c58SMing Lei * 'struct resync_pages'. 9698d30c58SMing Lei */ 9798d30c58SMing Lei static inline struct r1bio *get_resync_r1bio(struct bio *bio) 9898d30c58SMing Lei { 9998d30c58SMing Lei return get_resync_pages(bio)->raid_bio; 10098d30c58SMing Lei } 10198d30c58SMing Lei 102dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 1031da177e4SLinus Torvalds { 1041da177e4SLinus Torvalds struct pool_info *pi = data; 1059f2c9d12SNeilBrown int size = offsetof(struct r1bio, bios[pi->raid_disks]); 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 1087eaceaccSJens Axboe return kzalloc(size, gfp_flags); 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 1121da177e4SLinus Torvalds { 1131da177e4SLinus Torvalds kfree(r1_bio); 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds 1168e005f7cSmajianpeng #define RESYNC_DEPTH 32 1171da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 1188e005f7cSmajianpeng #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) 1198e005f7cSmajianpeng #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) 120c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) 121c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) 1221da177e4SLinus Torvalds 123dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 1241da177e4SLinus Torvalds { 1251da177e4SLinus Torvalds struct pool_info *pi = data; 1269f2c9d12SNeilBrown struct r1bio *r1_bio; 1271da177e4SLinus Torvalds struct bio *bio; 128da1aab3dSNeilBrown int need_pages; 12998d30c58SMing Lei int j; 13098d30c58SMing Lei struct resync_pages *rps; 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 1337eaceaccSJens Axboe if (!r1_bio) 1341da177e4SLinus Torvalds return NULL; 1351da177e4SLinus Torvalds 13698d30c58SMing Lei rps = kmalloc(sizeof(struct resync_pages) * pi->raid_disks, 13798d30c58SMing Lei gfp_flags); 13898d30c58SMing Lei if (!rps) 13998d30c58SMing Lei goto out_free_r1bio; 14098d30c58SMing Lei 1411da177e4SLinus Torvalds /* 1421da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 1431da177e4SLinus Torvalds */ 1441da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 1456746557fSNeilBrown bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); 1461da177e4SLinus Torvalds if (!bio) 1471da177e4SLinus Torvalds goto out_free_bio; 1481da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1491da177e4SLinus Torvalds } 1501da177e4SLinus Torvalds /* 1511da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 152d11c171eSNeilBrown * the first bio. 153d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 154d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1551da177e4SLinus Torvalds */ 156d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 157da1aab3dSNeilBrown need_pages = pi->raid_disks; 158d11c171eSNeilBrown else 159da1aab3dSNeilBrown need_pages = 1; 16098d30c58SMing Lei for (j = 0; j < pi->raid_disks; j++) { 16198d30c58SMing Lei struct resync_pages *rp = &rps[j]; 1621da177e4SLinus Torvalds 16398d30c58SMing Lei bio = r1_bio->bios[j]; 16498d30c58SMing Lei 16598d30c58SMing Lei if (j < need_pages) { 16698d30c58SMing Lei if (resync_alloc_pages(rp, gfp_flags)) 167da1aab3dSNeilBrown goto out_free_pages; 16898d30c58SMing Lei } else { 16998d30c58SMing Lei memcpy(rp, &rps[0], sizeof(*rp)); 17098d30c58SMing Lei resync_get_all_pages(rp); 171d11c171eSNeilBrown } 17298d30c58SMing Lei 17398d30c58SMing Lei rp->idx = 0; 17498d30c58SMing Lei rp->raid_bio = r1_bio; 17598d30c58SMing Lei bio->bi_private = rp; 176d11c171eSNeilBrown } 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds return r1_bio; 1811da177e4SLinus Torvalds 182da1aab3dSNeilBrown out_free_pages: 183491221f8SGuoqing Jiang while (--j >= 0) 18498d30c58SMing Lei resync_free_pages(&rps[j]); 185da1aab3dSNeilBrown 1861da177e4SLinus Torvalds out_free_bio: 1871da177e4SLinus Torvalds while (++j < pi->raid_disks) 1881da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 18998d30c58SMing Lei kfree(rps); 19098d30c58SMing Lei 19198d30c58SMing Lei out_free_r1bio: 1921da177e4SLinus Torvalds r1bio_pool_free(r1_bio, data); 1931da177e4SLinus Torvalds return NULL; 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 1971da177e4SLinus Torvalds { 1981da177e4SLinus Torvalds struct pool_info *pi = data; 19998d30c58SMing Lei int i; 2009f2c9d12SNeilBrown struct r1bio *r1bio = __r1_bio; 20198d30c58SMing Lei struct resync_pages *rp = NULL; 2021da177e4SLinus Torvalds 20398d30c58SMing Lei for (i = pi->raid_disks; i--; ) { 20498d30c58SMing Lei rp = get_resync_pages(r1bio->bios[i]); 20598d30c58SMing Lei resync_free_pages(rp); 2061da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 20798d30c58SMing Lei } 20898d30c58SMing Lei 20998d30c58SMing Lei /* resync pages array stored in the 1st bio's .bi_private */ 21098d30c58SMing Lei kfree(rp); 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds r1bio_pool_free(r1bio, data); 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds 215e8096360SNeilBrown static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) 2161da177e4SLinus Torvalds { 2171da177e4SLinus Torvalds int i; 2181da177e4SLinus Torvalds 2198f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2201da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 2214367af55SNeilBrown if (!BIO_SPECIAL(*bio)) 2221da177e4SLinus Torvalds bio_put(*bio); 2231da177e4SLinus Torvalds *bio = NULL; 2241da177e4SLinus Torvalds } 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds 2279f2c9d12SNeilBrown static void free_r1bio(struct r1bio *r1_bio) 2281da177e4SLinus Torvalds { 229e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 2321da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1bio_pool); 2331da177e4SLinus Torvalds } 2341da177e4SLinus Torvalds 2359f2c9d12SNeilBrown static void put_buf(struct r1bio *r1_bio) 2361da177e4SLinus Torvalds { 237e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 238af5f42a7SShaohua Li sector_t sect = r1_bio->sector; 2393e198f78SNeilBrown int i; 2403e198f78SNeilBrown 2418f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2423e198f78SNeilBrown struct bio *bio = r1_bio->bios[i]; 2433e198f78SNeilBrown if (bio->bi_end_io) 2443e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); 2453e198f78SNeilBrown } 2461da177e4SLinus Torvalds 2471da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1buf_pool); 2481da177e4SLinus Torvalds 249af5f42a7SShaohua Li lower_barrier(conf, sect); 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds 2529f2c9d12SNeilBrown static void reschedule_retry(struct r1bio *r1_bio) 2531da177e4SLinus Torvalds { 2541da177e4SLinus Torvalds unsigned long flags; 255fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 256e8096360SNeilBrown struct r1conf *conf = mddev->private; 257fd76863eScolyli@suse.de int idx; 2581da177e4SLinus Torvalds 259fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2601da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2611da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 262824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 2631da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 2641da177e4SLinus Torvalds 26517999be4SNeilBrown wake_up(&conf->wait_barrier); 2661da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 2671da177e4SLinus Torvalds } 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds /* 2701da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored 2711da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer 2721da177e4SLinus Torvalds * cache layer. 2731da177e4SLinus Torvalds */ 2749f2c9d12SNeilBrown static void call_bio_endio(struct r1bio *r1_bio) 275d2eb35acSNeilBrown { 276d2eb35acSNeilBrown struct bio *bio = r1_bio->master_bio; 277e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 278d2eb35acSNeilBrown 279d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2804246a0b6SChristoph Hellwig bio->bi_error = -EIO; 2814246a0b6SChristoph Hellwig 2824246a0b6SChristoph Hellwig bio_endio(bio); 283d2eb35acSNeilBrown /* 284d2eb35acSNeilBrown * Wake up any possible resync thread that waits for the device 285d2eb35acSNeilBrown * to go idle. 286d2eb35acSNeilBrown */ 28737011e3aSNeilBrown allow_barrier(conf, r1_bio->sector); 288d2eb35acSNeilBrown } 289d2eb35acSNeilBrown 2909f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 2911da177e4SLinus Torvalds { 2921da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 2931da177e4SLinus Torvalds 2944b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 2954b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 29636a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 2974b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 2984f024f37SKent Overstreet (unsigned long long) bio->bi_iter.bi_sector, 2994f024f37SKent Overstreet (unsigned long long) bio_end_sector(bio) - 1); 3004b6d287fSNeilBrown 301d2eb35acSNeilBrown call_bio_endio(r1_bio); 3024b6d287fSNeilBrown } 3031da177e4SLinus Torvalds free_r1bio(r1_bio); 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds /* 3071da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 3081da177e4SLinus Torvalds */ 3099f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 3101da177e4SLinus Torvalds { 311e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds conf->mirrors[disk].head_position = 3141da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 3151da177e4SLinus Torvalds } 3161da177e4SLinus Torvalds 317ba3ae3beSNamhyung Kim /* 318ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 319ba3ae3beSNamhyung Kim */ 3209f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 321ba3ae3beSNamhyung Kim { 322ba3ae3beSNamhyung Kim int mirror; 32330194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 32430194636SNeilBrown int raid_disks = conf->raid_disks; 325ba3ae3beSNamhyung Kim 3268f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 327ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 328ba3ae3beSNamhyung Kim break; 329ba3ae3beSNamhyung Kim 3308f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 331ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 332ba3ae3beSNamhyung Kim 333ba3ae3beSNamhyung Kim return mirror; 334ba3ae3beSNamhyung Kim } 335ba3ae3beSNamhyung Kim 3364246a0b6SChristoph Hellwig static void raid1_end_read_request(struct bio *bio) 3371da177e4SLinus Torvalds { 3384246a0b6SChristoph Hellwig int uptodate = !bio->bi_error; 3399f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 340e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 341e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds /* 3441da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3451da177e4SLinus Torvalds */ 346e5872d58SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 347ddaf22abSNeilBrown 348220946c9SNeilBrown if (uptodate) 3491da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3502e52d449SNeilBrown else if (test_bit(FailFast, &rdev->flags) && 3512e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 3522e52d449SNeilBrown /* This was a fail-fast read so we definitely 3532e52d449SNeilBrown * want to retry */ 3542e52d449SNeilBrown ; 355dd00a99eSNeilBrown else { 356dd00a99eSNeilBrown /* If all other devices have failed, we want to return 357dd00a99eSNeilBrown * the error upwards rather than fail the last device. 358dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 359dd00a99eSNeilBrown */ 360dd00a99eSNeilBrown unsigned long flags; 361dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 362dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 363dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 364e5872d58SNeilBrown test_bit(In_sync, &rdev->flags))) 365dd00a99eSNeilBrown uptodate = 1; 366dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 367dd00a99eSNeilBrown } 3681da177e4SLinus Torvalds 3697ad4d4a6SNeilBrown if (uptodate) { 3701da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 371e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 3727ad4d4a6SNeilBrown } else { 3731da177e4SLinus Torvalds /* 3741da177e4SLinus Torvalds * oops, read error: 3751da177e4SLinus Torvalds */ 3761da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3771d41c216SNeilBrown pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", 3789dd1e2faSNeilBrown mdname(conf->mddev), 3791d41c216SNeilBrown bdevname(rdev->bdev, b), 3808bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 381d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 3821da177e4SLinus Torvalds reschedule_retry(r1_bio); 3837ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */ 3841da177e4SLinus Torvalds } 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds 3879f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 3884e78064fSNeilBrown { 3894e78064fSNeilBrown /* it really is the end of this request */ 3904e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 391841c1316SMing Lei bio_free_pages(r1_bio->behind_master_bio); 392841c1316SMing Lei bio_put(r1_bio->behind_master_bio); 393841c1316SMing Lei r1_bio->behind_master_bio = NULL; 3944e78064fSNeilBrown } 3954e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 3964e78064fSNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 3974e78064fSNeilBrown r1_bio->sectors, 3984e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 399af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 4004e78064fSNeilBrown md_write_end(r1_bio->mddev); 401cd5ff9a1SNeilBrown } 402cd5ff9a1SNeilBrown 4039f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 404cd5ff9a1SNeilBrown { 405cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 406cd5ff9a1SNeilBrown return; 407cd5ff9a1SNeilBrown 408cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 409cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 410cd5ff9a1SNeilBrown else { 411cd5ff9a1SNeilBrown close_write(r1_bio); 4124367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 4134367af55SNeilBrown reschedule_retry(r1_bio); 4144367af55SNeilBrown else 4154e78064fSNeilBrown raid_end_bio_io(r1_bio); 4164e78064fSNeilBrown } 4174e78064fSNeilBrown } 4184e78064fSNeilBrown 4194246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio) 4201da177e4SLinus Torvalds { 4219f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 422e5872d58SNeilBrown int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 423e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 42404b857f7SNeilBrown struct bio *to_put = NULL; 425e5872d58SNeilBrown int mirror = find_bio_disk(r1_bio, bio); 426e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[mirror].rdev; 427e3f948cdSShaohua Li bool discard_error; 428e3f948cdSShaohua Li 429e3f948cdSShaohua Li discard_error = bio->bi_error && bio_op(bio) == REQ_OP_DISCARD; 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds /* 432e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4331da177e4SLinus Torvalds */ 434e3f948cdSShaohua Li if (bio->bi_error && !discard_error) { 435e5872d58SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 436e5872d58SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 43719d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 43819d67169SNeilBrown conf->mddev->recovery); 43919d67169SNeilBrown 440212e7eb7SNeilBrown if (test_bit(FailFast, &rdev->flags) && 441212e7eb7SNeilBrown (bio->bi_opf & MD_FAILFAST) && 442212e7eb7SNeilBrown /* We never try FailFast to WriteMostly devices */ 443212e7eb7SNeilBrown !test_bit(WriteMostly, &rdev->flags)) { 444212e7eb7SNeilBrown md_error(r1_bio->mddev, rdev); 445212e7eb7SNeilBrown if (!test_bit(Faulty, &rdev->flags)) 446212e7eb7SNeilBrown /* This is the only remaining device, 447212e7eb7SNeilBrown * We need to retry the write without 448212e7eb7SNeilBrown * FailFast 449212e7eb7SNeilBrown */ 450212e7eb7SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 451212e7eb7SNeilBrown else { 452212e7eb7SNeilBrown /* Finished with this branch */ 453212e7eb7SNeilBrown r1_bio->bios[mirror] = NULL; 454212e7eb7SNeilBrown to_put = bio; 455212e7eb7SNeilBrown } 456212e7eb7SNeilBrown } else 457cd5ff9a1SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 4584367af55SNeilBrown } else { 4591da177e4SLinus Torvalds /* 460e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 461e9c7469bSTejun Heo * will return a good error code for to the higher 462e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 463e9c7469bSTejun Heo * fails. 4641da177e4SLinus Torvalds * 465e9c7469bSTejun Heo * The 'master' represents the composite IO operation 466e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 467e9c7469bSTejun Heo * will wait for the 'master' bio. 4681da177e4SLinus Torvalds */ 4694367af55SNeilBrown sector_t first_bad; 4704367af55SNeilBrown int bad_sectors; 4714367af55SNeilBrown 472cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 473cd5ff9a1SNeilBrown to_put = bio; 4743056e3aeSAlex Lyakas /* 4753056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is 4763056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use 4773056e3aeSAlex Lyakas * such device for properly reading the data back (we could 4783056e3aeSAlex Lyakas * potentially use it, if the current write would have felt 4793056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't 4803056e3aeSAlex Lyakas * check this here. 4813056e3aeSAlex Lyakas */ 482e5872d58SNeilBrown if (test_bit(In_sync, &rdev->flags) && 483e5872d58SNeilBrown !test_bit(Faulty, &rdev->flags)) 4841da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 4851da177e4SLinus Torvalds 4864367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 487e5872d58SNeilBrown if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 488e3f948cdSShaohua Li &first_bad, &bad_sectors) && !discard_error) { 4894367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 4904367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 4914367af55SNeilBrown } 4924367af55SNeilBrown } 4934367af55SNeilBrown 4944b6d287fSNeilBrown if (behind) { 495841c1316SMing Lei /* we release behind master bio when all write are done */ 496841c1316SMing Lei if (r1_bio->behind_master_bio == bio) 497841c1316SMing Lei to_put = NULL; 498841c1316SMing Lei 499e5872d58SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) 5004b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 5014b6d287fSNeilBrown 502e9c7469bSTejun Heo /* 503e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 504e9c7469bSTejun Heo * has safely reached all non-writemostly 505e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 506e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 507e9c7469bSTejun Heo * -EIO here, instead we'll wait 508e9c7469bSTejun Heo */ 5094b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 5104b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 5114b6d287fSNeilBrown /* Maybe we can return now */ 5124b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 5134b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 51436a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 51536a4e1feSNeilBrown " %llu-%llu\n", 5164f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector, 5174f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1); 518d2eb35acSNeilBrown call_bio_endio(r1_bio); 5194b6d287fSNeilBrown } 5204b6d287fSNeilBrown } 5214b6d287fSNeilBrown } 5224367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 523e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 524e9c7469bSTejun Heo 5251da177e4SLinus Torvalds /* 5261da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 5271da177e4SLinus Torvalds * already. 5281da177e4SLinus Torvalds */ 529af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 530c70810b3SNeilBrown 53104b857f7SNeilBrown if (to_put) 53204b857f7SNeilBrown bio_put(to_put); 5331da177e4SLinus Torvalds } 5341da177e4SLinus Torvalds 535fd76863eScolyli@suse.de static sector_t align_to_barrier_unit_end(sector_t start_sector, 536fd76863eScolyli@suse.de sector_t sectors) 537fd76863eScolyli@suse.de { 538fd76863eScolyli@suse.de sector_t len; 539fd76863eScolyli@suse.de 540fd76863eScolyli@suse.de WARN_ON(sectors == 0); 541fd76863eScolyli@suse.de /* 542fd76863eScolyli@suse.de * len is the number of sectors from start_sector to end of the 543fd76863eScolyli@suse.de * barrier unit which start_sector belongs to. 544fd76863eScolyli@suse.de */ 545fd76863eScolyli@suse.de len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - 546fd76863eScolyli@suse.de start_sector; 547fd76863eScolyli@suse.de 548fd76863eScolyli@suse.de if (len > sectors) 549fd76863eScolyli@suse.de len = sectors; 550fd76863eScolyli@suse.de 551fd76863eScolyli@suse.de return len; 552fd76863eScolyli@suse.de } 553fd76863eScolyli@suse.de 5541da177e4SLinus Torvalds /* 5551da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 5561da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 5571da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 5581da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 5591da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 5601da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 5611da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 5621da177e4SLinus Torvalds * 5631da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 5641da177e4SLinus Torvalds * because position is mirror, not device based. 5651da177e4SLinus Torvalds * 5661da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 5671da177e4SLinus Torvalds */ 568e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 5691da177e4SLinus Torvalds { 570af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 571d2eb35acSNeilBrown int sectors; 572d2eb35acSNeilBrown int best_good_sectors; 5739dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 5749dedf603SShaohua Li int has_nonrot_disk; 575be4d3280SShaohua Li int disk; 57676073054SNeilBrown sector_t best_dist; 5779dedf603SShaohua Li unsigned int min_pending; 5783cb03002SNeilBrown struct md_rdev *rdev; 579f3ac8bf7SNeilBrown int choose_first; 58012cee5a8SShaohua Li int choose_next_idle; 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds rcu_read_lock(); 5831da177e4SLinus Torvalds /* 5848ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 5851da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 5861da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 5871da177e4SLinus Torvalds */ 5881da177e4SLinus Torvalds retry: 589d2eb35acSNeilBrown sectors = r1_bio->sectors; 59076073054SNeilBrown best_disk = -1; 5919dedf603SShaohua Li best_dist_disk = -1; 59276073054SNeilBrown best_dist = MaxSector; 5939dedf603SShaohua Li best_pending_disk = -1; 5949dedf603SShaohua Li min_pending = UINT_MAX; 595d2eb35acSNeilBrown best_good_sectors = 0; 5969dedf603SShaohua Li has_nonrot_disk = 0; 59712cee5a8SShaohua Li choose_next_idle = 0; 5982e52d449SNeilBrown clear_bit(R1BIO_FailFast, &r1_bio->state); 599d2eb35acSNeilBrown 6007d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) || 6017d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) && 60290382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, 6037d49ffcfSGoldwyn Rodrigues this_sector + sectors))) 6047d49ffcfSGoldwyn Rodrigues choose_first = 1; 6057d49ffcfSGoldwyn Rodrigues else 6067d49ffcfSGoldwyn Rodrigues choose_first = 0; 6071da177e4SLinus Torvalds 608be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 60976073054SNeilBrown sector_t dist; 610d2eb35acSNeilBrown sector_t first_bad; 611d2eb35acSNeilBrown int bad_sectors; 6129dedf603SShaohua Li unsigned int pending; 61312cee5a8SShaohua Li bool nonrot; 614d2eb35acSNeilBrown 615f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 616f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 617f3ac8bf7SNeilBrown || rdev == NULL 61876073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 619f3ac8bf7SNeilBrown continue; 62076073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 62176073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 62276073054SNeilBrown continue; 62376073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 62476073054SNeilBrown /* Don't balance among write-mostly, just 62576073054SNeilBrown * use the first as a last resort */ 626d1901ef0STomáš Hodek if (best_dist_disk < 0) { 627307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 628307729c8SNeilBrown &first_bad, &bad_sectors)) { 629816b0acfSWei Fang if (first_bad <= this_sector) 630307729c8SNeilBrown /* Cannot use this */ 631307729c8SNeilBrown continue; 632307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 633307729c8SNeilBrown } else 634307729c8SNeilBrown best_good_sectors = sectors; 635d1901ef0STomáš Hodek best_dist_disk = disk; 636d1901ef0STomáš Hodek best_pending_disk = disk; 637307729c8SNeilBrown } 63876073054SNeilBrown continue; 6398ddf9efeSNeilBrown } 64076073054SNeilBrown /* This is a reasonable device to use. It might 64176073054SNeilBrown * even be best. 6421da177e4SLinus Torvalds */ 643d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 644d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 645d2eb35acSNeilBrown if (best_dist < MaxSector) 646d2eb35acSNeilBrown /* already have a better device */ 647d2eb35acSNeilBrown continue; 648d2eb35acSNeilBrown if (first_bad <= this_sector) { 649d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 650d2eb35acSNeilBrown * device, then we must not read beyond 651d2eb35acSNeilBrown * bad_sectors from another device.. 652d2eb35acSNeilBrown */ 653d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 654d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 655d2eb35acSNeilBrown sectors = bad_sectors; 656d2eb35acSNeilBrown if (best_good_sectors > sectors) 657d2eb35acSNeilBrown best_good_sectors = sectors; 658d2eb35acSNeilBrown 659d2eb35acSNeilBrown } else { 660d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 661d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 662d2eb35acSNeilBrown best_good_sectors = good_sectors; 663d2eb35acSNeilBrown best_disk = disk; 664d2eb35acSNeilBrown } 665d2eb35acSNeilBrown if (choose_first) 666d2eb35acSNeilBrown break; 667d2eb35acSNeilBrown } 668d2eb35acSNeilBrown continue; 669d2eb35acSNeilBrown } else 670d2eb35acSNeilBrown best_good_sectors = sectors; 671d2eb35acSNeilBrown 6722e52d449SNeilBrown if (best_disk >= 0) 6732e52d449SNeilBrown /* At least two disks to choose from so failfast is OK */ 6742e52d449SNeilBrown set_bit(R1BIO_FailFast, &r1_bio->state); 6752e52d449SNeilBrown 67612cee5a8SShaohua Li nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); 67712cee5a8SShaohua Li has_nonrot_disk |= nonrot; 6789dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 67976073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 68012cee5a8SShaohua Li if (choose_first) { 68176073054SNeilBrown best_disk = disk; 6821da177e4SLinus Torvalds break; 6831da177e4SLinus Torvalds } 68412cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 68512cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 68612cee5a8SShaohua Li || dist == 0) { 68712cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 68812cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 68912cee5a8SShaohua Li 69012cee5a8SShaohua Li best_disk = disk; 69112cee5a8SShaohua Li /* 69212cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 69312cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 69412cee5a8SShaohua Li * the idle disk. read_balance could already choose an 69512cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 69612cee5a8SShaohua Li * this disk. This doesn't matter because this disk 69712cee5a8SShaohua Li * will idle, next time it will be utilized after the 69812cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 69912cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 70012cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 70112cee5a8SShaohua Li * small, but not a big deal since when the second disk 70212cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 70312cee5a8SShaohua Li */ 70412cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 70512cee5a8SShaohua Li mirror->seq_start != MaxSector && 70612cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 70712cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 70812cee5a8SShaohua Li mirror->seq_start) { 70912cee5a8SShaohua Li choose_next_idle = 1; 71012cee5a8SShaohua Li continue; 71112cee5a8SShaohua Li } 71212cee5a8SShaohua Li break; 71312cee5a8SShaohua Li } 71412cee5a8SShaohua Li 71512cee5a8SShaohua Li if (choose_next_idle) 71612cee5a8SShaohua Li continue; 7179dedf603SShaohua Li 7189dedf603SShaohua Li if (min_pending > pending) { 7199dedf603SShaohua Li min_pending = pending; 7209dedf603SShaohua Li best_pending_disk = disk; 7219dedf603SShaohua Li } 7229dedf603SShaohua Li 72376073054SNeilBrown if (dist < best_dist) { 72476073054SNeilBrown best_dist = dist; 7259dedf603SShaohua Li best_dist_disk = disk; 7261da177e4SLinus Torvalds } 727f3ac8bf7SNeilBrown } 7281da177e4SLinus Torvalds 7299dedf603SShaohua Li /* 7309dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 7319dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 7329dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 7339dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 7349dedf603SShaohua Li */ 7359dedf603SShaohua Li if (best_disk == -1) { 7362e52d449SNeilBrown if (has_nonrot_disk || min_pending == 0) 7379dedf603SShaohua Li best_disk = best_pending_disk; 7389dedf603SShaohua Li else 7399dedf603SShaohua Li best_disk = best_dist_disk; 7409dedf603SShaohua Li } 7419dedf603SShaohua Li 74276073054SNeilBrown if (best_disk >= 0) { 74376073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 7448ddf9efeSNeilBrown if (!rdev) 7458ddf9efeSNeilBrown goto retry; 7468ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 747d2eb35acSNeilBrown sectors = best_good_sectors; 74812cee5a8SShaohua Li 74912cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 75012cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 75112cee5a8SShaohua Li 752be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 7531da177e4SLinus Torvalds } 7541da177e4SLinus Torvalds rcu_read_unlock(); 755d2eb35acSNeilBrown *max_sectors = sectors; 7561da177e4SLinus Torvalds 75776073054SNeilBrown return best_disk; 7581da177e4SLinus Torvalds } 7591da177e4SLinus Torvalds 7605c675f83SNeilBrown static int raid1_congested(struct mddev *mddev, int bits) 7610d129228SNeilBrown { 762e8096360SNeilBrown struct r1conf *conf = mddev->private; 7630d129228SNeilBrown int i, ret = 0; 7640d129228SNeilBrown 7654452226eSTejun Heo if ((bits & (1 << WB_async_congested)) && 76634db0cd6SNeilBrown conf->pending_count >= max_queued_requests) 76734db0cd6SNeilBrown return 1; 76834db0cd6SNeilBrown 7690d129228SNeilBrown rcu_read_lock(); 770f53e29fcSNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 7713cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 7720d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 773165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 7740d129228SNeilBrown 7751ed7242eSJonathan Brassow BUG_ON(!q); 7761ed7242eSJonathan Brassow 7770d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 7780d129228SNeilBrown * non-congested targets, it can be removed 7790d129228SNeilBrown */ 7804452226eSTejun Heo if ((bits & (1 << WB_async_congested)) || 1) 781dc3b17ccSJan Kara ret |= bdi_congested(q->backing_dev_info, bits); 7820d129228SNeilBrown else 783dc3b17ccSJan Kara ret &= bdi_congested(q->backing_dev_info, bits); 7840d129228SNeilBrown } 7850d129228SNeilBrown } 7860d129228SNeilBrown rcu_read_unlock(); 7870d129228SNeilBrown return ret; 7880d129228SNeilBrown } 7890d129228SNeilBrown 790e8096360SNeilBrown static void flush_pending_writes(struct r1conf *conf) 791a35e63efSNeilBrown { 792a35e63efSNeilBrown /* Any writes that have been queued but are awaiting 793a35e63efSNeilBrown * bitmap updates get flushed here. 794a35e63efSNeilBrown */ 795a35e63efSNeilBrown spin_lock_irq(&conf->device_lock); 796a35e63efSNeilBrown 797a35e63efSNeilBrown if (conf->pending_bio_list.head) { 798a35e63efSNeilBrown struct bio *bio; 799a35e63efSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 80034db0cd6SNeilBrown conf->pending_count = 0; 801a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 802a35e63efSNeilBrown /* flush any pending bitmap writes to 803a35e63efSNeilBrown * disk before proceeding w/ I/O */ 804a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 80534db0cd6SNeilBrown wake_up(&conf->wait_barrier); 806a35e63efSNeilBrown 807a35e63efSNeilBrown while (bio) { /* submit pending writes */ 808a35e63efSNeilBrown struct bio *next = bio->bi_next; 8095e2c7a36SNeilBrown struct md_rdev *rdev = (void*)bio->bi_bdev; 810a35e63efSNeilBrown bio->bi_next = NULL; 8115e2c7a36SNeilBrown bio->bi_bdev = rdev->bdev; 8125e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 8135e2c7a36SNeilBrown bio->bi_error = -EIO; 8145e2c7a36SNeilBrown bio_endio(bio); 8155e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 8162ff8cc2cSShaohua Li !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) 8172ff8cc2cSShaohua Li /* Just ignore it */ 8184246a0b6SChristoph Hellwig bio_endio(bio); 8192ff8cc2cSShaohua Li else 820a35e63efSNeilBrown generic_make_request(bio); 821a35e63efSNeilBrown bio = next; 822a35e63efSNeilBrown } 823a35e63efSNeilBrown } else 824a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 8257eaceaccSJens Axboe } 8267eaceaccSJens Axboe 82717999be4SNeilBrown /* Barriers.... 82817999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 82917999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 83017999be4SNeilBrown * To do this we raise a 'barrier'. 83117999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 83217999be4SNeilBrown * to count how many activities are happening which preclude 83317999be4SNeilBrown * normal IO. 83417999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 83517999be4SNeilBrown * i.e. if nr_pending == 0. 83617999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 83717999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 83817999be4SNeilBrown * is ready, no other operations which require a barrier will start 83917999be4SNeilBrown * until the IO request has had a chance. 84017999be4SNeilBrown * 84117999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 84217999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 84317999be4SNeilBrown * allow_barrier when it has finished its IO. 84417999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 84517999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 84617999be4SNeilBrown * lower_barrier when the particular background IO completes. 8471da177e4SLinus Torvalds */ 848c2fd4c94SNeilBrown static void raise_barrier(struct r1conf *conf, sector_t sector_nr) 8491da177e4SLinus Torvalds { 850fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 851fd76863eScolyli@suse.de 8521da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 8531da177e4SLinus Torvalds 85417999be4SNeilBrown /* Wait until no block IO is waiting */ 855824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 856824e47daScolyli@suse.de !atomic_read(&conf->nr_waiting[idx]), 857eed8c02eSLukas Czerner conf->resync_lock); 85817999be4SNeilBrown 85917999be4SNeilBrown /* block any new IO from starting */ 860824e47daScolyli@suse.de atomic_inc(&conf->barrier[idx]); 861824e47daScolyli@suse.de /* 862824e47daScolyli@suse.de * In raise_barrier() we firstly increase conf->barrier[idx] then 863824e47daScolyli@suse.de * check conf->nr_pending[idx]. In _wait_barrier() we firstly 864824e47daScolyli@suse.de * increase conf->nr_pending[idx] then check conf->barrier[idx]. 865824e47daScolyli@suse.de * A memory barrier here to make sure conf->nr_pending[idx] won't 866824e47daScolyli@suse.de * be fetched before conf->barrier[idx] is increased. Otherwise 867824e47daScolyli@suse.de * there will be a race between raise_barrier() and _wait_barrier(). 868824e47daScolyli@suse.de */ 869824e47daScolyli@suse.de smp_mb__after_atomic(); 87017999be4SNeilBrown 87179ef3a8aSmajianpeng /* For these conditions we must wait: 87279ef3a8aSmajianpeng * A: while the array is in frozen state 873fd76863eScolyli@suse.de * B: while conf->nr_pending[idx] is not 0, meaning regular I/O 874fd76863eScolyli@suse.de * existing in corresponding I/O barrier bucket. 875fd76863eScolyli@suse.de * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches 876fd76863eScolyli@suse.de * max resync count which allowed on current I/O barrier bucket. 87779ef3a8aSmajianpeng */ 87817999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 879b364e3d0Smajianpeng !conf->array_frozen && 880824e47daScolyli@suse.de !atomic_read(&conf->nr_pending[idx]) && 881824e47daScolyli@suse.de atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH, 882eed8c02eSLukas Czerner conf->resync_lock); 88317999be4SNeilBrown 884824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 8851da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 8861da177e4SLinus Torvalds } 8871da177e4SLinus Torvalds 888fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr) 88917999be4SNeilBrown { 890fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 891fd76863eScolyli@suse.de 892824e47daScolyli@suse.de BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); 893fd76863eScolyli@suse.de 894824e47daScolyli@suse.de atomic_dec(&conf->barrier[idx]); 895824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 89617999be4SNeilBrown wake_up(&conf->wait_barrier); 89717999be4SNeilBrown } 89817999be4SNeilBrown 899fd76863eScolyli@suse.de static void _wait_barrier(struct r1conf *conf, int idx) 90017999be4SNeilBrown { 901824e47daScolyli@suse.de /* 902824e47daScolyli@suse.de * We need to increase conf->nr_pending[idx] very early here, 903824e47daScolyli@suse.de * then raise_barrier() can be blocked when it waits for 904824e47daScolyli@suse.de * conf->nr_pending[idx] to be 0. Then we can avoid holding 905824e47daScolyli@suse.de * conf->resync_lock when there is no barrier raised in same 906824e47daScolyli@suse.de * barrier unit bucket. Also if the array is frozen, I/O 907824e47daScolyli@suse.de * should be blocked until array is unfrozen. 908824e47daScolyli@suse.de */ 909824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 910824e47daScolyli@suse.de /* 911824e47daScolyli@suse.de * In _wait_barrier() we firstly increase conf->nr_pending[idx], then 912824e47daScolyli@suse.de * check conf->barrier[idx]. In raise_barrier() we firstly increase 913824e47daScolyli@suse.de * conf->barrier[idx], then check conf->nr_pending[idx]. A memory 914824e47daScolyli@suse.de * barrier is necessary here to make sure conf->barrier[idx] won't be 915824e47daScolyli@suse.de * fetched before conf->nr_pending[idx] is increased. Otherwise there 916824e47daScolyli@suse.de * will be a race between _wait_barrier() and raise_barrier(). 917824e47daScolyli@suse.de */ 918824e47daScolyli@suse.de smp_mb__after_atomic(); 91979ef3a8aSmajianpeng 920824e47daScolyli@suse.de /* 921824e47daScolyli@suse.de * Don't worry about checking two atomic_t variables at same time 922824e47daScolyli@suse.de * here. If during we check conf->barrier[idx], the array is 923824e47daScolyli@suse.de * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is 924824e47daScolyli@suse.de * 0, it is safe to return and make the I/O continue. Because the 925824e47daScolyli@suse.de * array is frozen, all I/O returned here will eventually complete 926824e47daScolyli@suse.de * or be queued, no race will happen. See code comment in 927824e47daScolyli@suse.de * frozen_array(). 928824e47daScolyli@suse.de */ 929824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen) && 930824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx])) 931824e47daScolyli@suse.de return; 932824e47daScolyli@suse.de 933824e47daScolyli@suse.de /* 934824e47daScolyli@suse.de * After holding conf->resync_lock, conf->nr_pending[idx] 935824e47daScolyli@suse.de * should be decreased before waiting for barrier to drop. 936824e47daScolyli@suse.de * Otherwise, we may encounter a race condition because 937824e47daScolyli@suse.de * raise_barrer() might be waiting for conf->nr_pending[idx] 938824e47daScolyli@suse.de * to be 0 at same time. 939824e47daScolyli@suse.de */ 940824e47daScolyli@suse.de spin_lock_irq(&conf->resync_lock); 941824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 942824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 943824e47daScolyli@suse.de /* 944824e47daScolyli@suse.de * In case freeze_array() is waiting for 945824e47daScolyli@suse.de * get_unqueued_pending() == extra 946824e47daScolyli@suse.de */ 947824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 948824e47daScolyli@suse.de /* Wait for the barrier in same barrier unit bucket to drop. */ 949824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 950824e47daScolyli@suse.de !conf->array_frozen && 951824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx]), 952824e47daScolyli@suse.de conf->resync_lock); 953824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 954824e47daScolyli@suse.de atomic_dec(&conf->nr_waiting[idx]); 955fd76863eScolyli@suse.de spin_unlock_irq(&conf->resync_lock); 95679ef3a8aSmajianpeng } 95779ef3a8aSmajianpeng 958fd76863eScolyli@suse.de static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) 95979ef3a8aSmajianpeng { 960fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 96179ef3a8aSmajianpeng 962824e47daScolyli@suse.de /* 963824e47daScolyli@suse.de * Very similar to _wait_barrier(). The difference is, for read 964824e47daScolyli@suse.de * I/O we don't need wait for sync I/O, but if the whole array 965824e47daScolyli@suse.de * is frozen, the read I/O still has to wait until the array is 966824e47daScolyli@suse.de * unfrozen. Since there is no ordering requirement with 967824e47daScolyli@suse.de * conf->barrier[idx] here, memory barrier is unnecessary as well. 968824e47daScolyli@suse.de */ 969824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 970824e47daScolyli@suse.de 971824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen)) 972824e47daScolyli@suse.de return; 97317999be4SNeilBrown 97417999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 975824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 976824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 977824e47daScolyli@suse.de /* 978824e47daScolyli@suse.de * In case freeze_array() is waiting for 979824e47daScolyli@suse.de * get_unqueued_pending() == extra 980d6b42dcbSNeilBrown */ 98117999be4SNeilBrown wake_up(&conf->wait_barrier); 982824e47daScolyli@suse.de /* Wait for array to be unfrozen */ 983824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 984fd76863eScolyli@suse.de !conf->array_frozen, 9851da177e4SLinus Torvalds conf->resync_lock); 986824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 987824e47daScolyli@suse.de atomic_dec(&conf->nr_waiting[idx]); 98817999be4SNeilBrown spin_unlock_irq(&conf->resync_lock); 98917999be4SNeilBrown } 99017999be4SNeilBrown 99137011e3aSNeilBrown static void inc_pending(struct r1conf *conf, sector_t bi_sector) 99237011e3aSNeilBrown { 99337011e3aSNeilBrown /* The current request requires multiple r1_bio, so 99437011e3aSNeilBrown * we need to increment the pending count, and the corresponding 99537011e3aSNeilBrown * window count. 99637011e3aSNeilBrown */ 99737011e3aSNeilBrown int idx = sector_to_idx(bi_sector); 99837011e3aSNeilBrown atomic_inc(&conf->nr_pending[idx]); 99937011e3aSNeilBrown } 100037011e3aSNeilBrown 1001fd76863eScolyli@suse.de static void wait_barrier(struct r1conf *conf, sector_t sector_nr) 1002fd76863eScolyli@suse.de { 1003fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1004fd76863eScolyli@suse.de 1005fd76863eScolyli@suse.de _wait_barrier(conf, idx); 1006fd76863eScolyli@suse.de } 1007fd76863eScolyli@suse.de 1008fd76863eScolyli@suse.de static void wait_all_barriers(struct r1conf *conf) 1009fd76863eScolyli@suse.de { 1010fd76863eScolyli@suse.de int idx; 1011fd76863eScolyli@suse.de 1012fd76863eScolyli@suse.de for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1013fd76863eScolyli@suse.de _wait_barrier(conf, idx); 1014fd76863eScolyli@suse.de } 1015fd76863eScolyli@suse.de 1016fd76863eScolyli@suse.de static void _allow_barrier(struct r1conf *conf, int idx) 101717999be4SNeilBrown { 1018824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 101917999be4SNeilBrown wake_up(&conf->wait_barrier); 102017999be4SNeilBrown } 102117999be4SNeilBrown 1022fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr) 1023fd76863eScolyli@suse.de { 1024fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1025fd76863eScolyli@suse.de 1026fd76863eScolyli@suse.de _allow_barrier(conf, idx); 1027fd76863eScolyli@suse.de } 1028fd76863eScolyli@suse.de 1029fd76863eScolyli@suse.de static void allow_all_barriers(struct r1conf *conf) 1030fd76863eScolyli@suse.de { 1031fd76863eScolyli@suse.de int idx; 1032fd76863eScolyli@suse.de 1033fd76863eScolyli@suse.de for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1034fd76863eScolyli@suse.de _allow_barrier(conf, idx); 1035fd76863eScolyli@suse.de } 1036fd76863eScolyli@suse.de 1037fd76863eScolyli@suse.de /* conf->resync_lock should be held */ 1038fd76863eScolyli@suse.de static int get_unqueued_pending(struct r1conf *conf) 1039fd76863eScolyli@suse.de { 1040fd76863eScolyli@suse.de int idx, ret; 1041fd76863eScolyli@suse.de 1042fd76863eScolyli@suse.de for (ret = 0, idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1043824e47daScolyli@suse.de ret += atomic_read(&conf->nr_pending[idx]) - 1044824e47daScolyli@suse.de atomic_read(&conf->nr_queued[idx]); 1045fd76863eScolyli@suse.de 1046fd76863eScolyli@suse.de return ret; 104717999be4SNeilBrown } 104817999be4SNeilBrown 1049e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra) 1050ddaf22abSNeilBrown { 1051fd76863eScolyli@suse.de /* Stop sync I/O and normal I/O and wait for everything to 105211353b9dSZhilong Liu * go quiet. 1053fd76863eScolyli@suse.de * This is called in two situations: 1054fd76863eScolyli@suse.de * 1) management command handlers (reshape, remove disk, quiesce). 1055fd76863eScolyli@suse.de * 2) one normal I/O request failed. 1056fd76863eScolyli@suse.de 1057fd76863eScolyli@suse.de * After array_frozen is set to 1, new sync IO will be blocked at 1058fd76863eScolyli@suse.de * raise_barrier(), and new normal I/O will blocked at _wait_barrier() 1059fd76863eScolyli@suse.de * or wait_read_barrier(). The flying I/Os will either complete or be 1060fd76863eScolyli@suse.de * queued. When everything goes quite, there are only queued I/Os left. 1061fd76863eScolyli@suse.de 1062fd76863eScolyli@suse.de * Every flying I/O contributes to a conf->nr_pending[idx], idx is the 1063fd76863eScolyli@suse.de * barrier bucket index which this I/O request hits. When all sync and 1064fd76863eScolyli@suse.de * normal I/O are queued, sum of all conf->nr_pending[] will match sum 1065fd76863eScolyli@suse.de * of all conf->nr_queued[]. But normal I/O failure is an exception, 1066fd76863eScolyli@suse.de * in handle_read_error(), we may call freeze_array() before trying to 1067fd76863eScolyli@suse.de * fix the read error. In this case, the error read I/O is not queued, 1068fd76863eScolyli@suse.de * so get_unqueued_pending() == 1. 1069fd76863eScolyli@suse.de * 1070fd76863eScolyli@suse.de * Therefore before this function returns, we need to wait until 1071fd76863eScolyli@suse.de * get_unqueued_pendings(conf) gets equal to extra. For 1072fd76863eScolyli@suse.de * normal I/O context, extra is 1, in rested situations extra is 0. 1073ddaf22abSNeilBrown */ 1074ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1075b364e3d0Smajianpeng conf->array_frozen = 1; 1076578b54adSNeilBrown raid1_log(conf->mddev, "wait freeze"); 1077fd76863eScolyli@suse.de wait_event_lock_irq_cmd( 1078fd76863eScolyli@suse.de conf->wait_barrier, 1079fd76863eScolyli@suse.de get_unqueued_pending(conf) == extra, 1080ddaf22abSNeilBrown conf->resync_lock, 1081c3b328acSNeilBrown flush_pending_writes(conf)); 1082ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1083ddaf22abSNeilBrown } 1084e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 1085ddaf22abSNeilBrown { 1086ddaf22abSNeilBrown /* reverse the effect of the freeze */ 1087ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1088b364e3d0Smajianpeng conf->array_frozen = 0; 1089ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1090824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 1091ddaf22abSNeilBrown } 1092ddaf22abSNeilBrown 1093841c1316SMing Lei static struct bio *alloc_behind_master_bio(struct r1bio *r1_bio, 1094841c1316SMing Lei struct bio *bio, 1095841c1316SMing Lei int offset, int size) 10964b6d287fSNeilBrown { 1097841c1316SMing Lei unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 1098841c1316SMing Lei int i = 0; 1099841c1316SMing Lei struct bio *behind_bio = NULL; 11004b6d287fSNeilBrown 1101841c1316SMing Lei behind_bio = bio_alloc_mddev(GFP_NOIO, vcnt, r1_bio->mddev); 1102841c1316SMing Lei if (!behind_bio) 1103841c1316SMing Lei goto fail; 1104841c1316SMing Lei 110541743c1fSShaohua Li /* discard op, we don't support writezero/writesame yet */ 110641743c1fSShaohua Li if (!bio_has_data(bio)) 110741743c1fSShaohua Li goto skip_copy; 110841743c1fSShaohua Li 1109841c1316SMing Lei while (i < vcnt && size) { 1110841c1316SMing Lei struct page *page; 1111841c1316SMing Lei int len = min_t(int, PAGE_SIZE, size); 1112841c1316SMing Lei 1113841c1316SMing Lei page = alloc_page(GFP_NOIO); 1114841c1316SMing Lei if (unlikely(!page)) 1115841c1316SMing Lei goto free_pages; 1116841c1316SMing Lei 1117841c1316SMing Lei bio_add_page(behind_bio, page, len, 0); 1118841c1316SMing Lei 1119841c1316SMing Lei size -= len; 1120841c1316SMing Lei i++; 11214b6d287fSNeilBrown } 11224b6d287fSNeilBrown 1123841c1316SMing Lei bio_copy_data_partial(behind_bio, bio, offset, 1124841c1316SMing Lei behind_bio->bi_iter.bi_size); 112541743c1fSShaohua Li skip_copy: 1126841c1316SMing Lei r1_bio->behind_master_bio = behind_bio;; 1127841c1316SMing Lei set_bit(R1BIO_BehindIO, &r1_bio->state); 1128841c1316SMing Lei 1129841c1316SMing Lei return behind_bio; 1130841c1316SMing Lei 1131841c1316SMing Lei free_pages: 11324f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n", 11334f024f37SKent Overstreet bio->bi_iter.bi_size); 1134841c1316SMing Lei bio_free_pages(behind_bio); 1135841c1316SMing Lei fail: 1136841c1316SMing Lei return behind_bio; 11374b6d287fSNeilBrown } 11384b6d287fSNeilBrown 1139f54a9d0eSNeilBrown struct raid1_plug_cb { 1140f54a9d0eSNeilBrown struct blk_plug_cb cb; 1141f54a9d0eSNeilBrown struct bio_list pending; 1142f54a9d0eSNeilBrown int pending_cnt; 1143f54a9d0eSNeilBrown }; 1144f54a9d0eSNeilBrown 1145f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) 1146f54a9d0eSNeilBrown { 1147f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, 1148f54a9d0eSNeilBrown cb); 1149f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data; 1150f54a9d0eSNeilBrown struct r1conf *conf = mddev->private; 1151f54a9d0eSNeilBrown struct bio *bio; 1152f54a9d0eSNeilBrown 1153874807a8SNeilBrown if (from_schedule || current->bio_list) { 1154f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock); 1155f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending); 1156f54a9d0eSNeilBrown conf->pending_count += plug->pending_cnt; 1157f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock); 1158ee0b0244SNeilBrown wake_up(&conf->wait_barrier); 1159f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread); 1160f54a9d0eSNeilBrown kfree(plug); 1161f54a9d0eSNeilBrown return; 1162f54a9d0eSNeilBrown } 1163f54a9d0eSNeilBrown 1164f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */ 1165f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending); 1166f54a9d0eSNeilBrown bitmap_unplug(mddev->bitmap); 1167f54a9d0eSNeilBrown wake_up(&conf->wait_barrier); 1168f54a9d0eSNeilBrown 1169f54a9d0eSNeilBrown while (bio) { /* submit pending writes */ 1170f54a9d0eSNeilBrown struct bio *next = bio->bi_next; 11715e2c7a36SNeilBrown struct md_rdev *rdev = (void*)bio->bi_bdev; 1172f54a9d0eSNeilBrown bio->bi_next = NULL; 11735e2c7a36SNeilBrown bio->bi_bdev = rdev->bdev; 11745e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 11755e2c7a36SNeilBrown bio->bi_error = -EIO; 11765e2c7a36SNeilBrown bio_endio(bio); 11775e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 117832f9f570SShaohua Li !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) 117932f9f570SShaohua Li /* Just ignore it */ 11804246a0b6SChristoph Hellwig bio_endio(bio); 118132f9f570SShaohua Li else 1182f54a9d0eSNeilBrown generic_make_request(bio); 1183f54a9d0eSNeilBrown bio = next; 1184f54a9d0eSNeilBrown } 1185f54a9d0eSNeilBrown kfree(plug); 1186f54a9d0eSNeilBrown } 1187f54a9d0eSNeilBrown 1188fd76863eScolyli@suse.de static inline struct r1bio * 1189fd76863eScolyli@suse.de alloc_r1bio(struct mddev *mddev, struct bio *bio, sector_t sectors_handled) 1190fd76863eScolyli@suse.de { 1191fd76863eScolyli@suse.de struct r1conf *conf = mddev->private; 1192fd76863eScolyli@suse.de struct r1bio *r1_bio; 1193fd76863eScolyli@suse.de 1194fd76863eScolyli@suse.de r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 1195fd76863eScolyli@suse.de 1196fd76863eScolyli@suse.de r1_bio->master_bio = bio; 1197fd76863eScolyli@suse.de r1_bio->sectors = bio_sectors(bio) - sectors_handled; 1198fd76863eScolyli@suse.de r1_bio->state = 0; 1199fd76863eScolyli@suse.de r1_bio->mddev = mddev; 1200fd76863eScolyli@suse.de r1_bio->sector = bio->bi_iter.bi_sector + sectors_handled; 1201fd76863eScolyli@suse.de 1202fd76863eScolyli@suse.de return r1_bio; 1203fd76863eScolyli@suse.de } 1204fd76863eScolyli@suse.de 1205c230e7e5SNeilBrown static void raid1_read_request(struct mddev *mddev, struct bio *bio, 1206c230e7e5SNeilBrown int max_read_sectors) 12071da177e4SLinus Torvalds { 1208e8096360SNeilBrown struct r1conf *conf = mddev->private; 12090eaf822cSJonathan Brassow struct raid1_info *mirror; 1210fd76863eScolyli@suse.de struct r1bio *r1_bio; 12111da177e4SLinus Torvalds struct bio *read_bio; 12123b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 1213796a5cf0SMike Christie const int op = bio_op(bio); 12141eff9d32SJens Axboe const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); 12151f68f0c4SNeilBrown int max_sectors; 1216d2eb35acSNeilBrown int rdisk; 1217d2eb35acSNeilBrown 1218fd76863eScolyli@suse.de /* 1219fd76863eScolyli@suse.de * Still need barrier for READ in case that whole 1220fd76863eScolyli@suse.de * array is frozen. 1221fd76863eScolyli@suse.de */ 1222fd76863eScolyli@suse.de wait_read_barrier(conf, bio->bi_iter.bi_sector); 12233b046a97SRobert LeBlanc 1224fd76863eScolyli@suse.de r1_bio = alloc_r1bio(mddev, bio, 0); 1225c230e7e5SNeilBrown r1_bio->sectors = max_read_sectors; 1226fd76863eScolyli@suse.de 1227fd76863eScolyli@suse.de /* 1228fd76863eScolyli@suse.de * make_request() can abort the operation when read-ahead is being 1229fd76863eScolyli@suse.de * used and no empty request is available. 1230fd76863eScolyli@suse.de */ 1231d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 12321da177e4SLinus Torvalds 12331da177e4SLinus Torvalds if (rdisk < 0) { 12341da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 12351da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 12365a7bbad2SChristoph Hellwig return; 12371da177e4SLinus Torvalds } 12381da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 12391da177e4SLinus Torvalds 1240e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1241e555190dSNeilBrown bitmap) { 12423b046a97SRobert LeBlanc /* 12433b046a97SRobert LeBlanc * Reading from a write-mostly device must take care not to 12443b046a97SRobert LeBlanc * over-take any writes that are 'behind' 1245e555190dSNeilBrown */ 1246578b54adSNeilBrown raid1_log(mddev, "wait behind writes"); 1247e555190dSNeilBrown wait_event(bitmap->behind_wait, 1248e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 1249e555190dSNeilBrown } 1250c230e7e5SNeilBrown 1251c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1252c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1253c230e7e5SNeilBrown GFP_NOIO, conf->bio_split); 1254c230e7e5SNeilBrown bio_chain(split, bio); 1255c230e7e5SNeilBrown generic_make_request(bio); 1256c230e7e5SNeilBrown bio = split; 1257c230e7e5SNeilBrown r1_bio->master_bio = bio; 1258c230e7e5SNeilBrown r1_bio->sectors = max_sectors; 1259c230e7e5SNeilBrown } 1260c230e7e5SNeilBrown 12611da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 12621da177e4SLinus Torvalds 1263d7a10308SMing Lei read_bio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); 12641da177e4SLinus Torvalds 12651da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 12661da177e4SLinus Torvalds 12674f024f37SKent Overstreet read_bio->bi_iter.bi_sector = r1_bio->sector + 12684f024f37SKent Overstreet mirror->rdev->data_offset; 12691da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 12701da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 1271796a5cf0SMike Christie bio_set_op_attrs(read_bio, op, do_sync); 12722e52d449SNeilBrown if (test_bit(FailFast, &mirror->rdev->flags) && 12732e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 12742e52d449SNeilBrown read_bio->bi_opf |= MD_FAILFAST; 12751da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 12761da177e4SLinus Torvalds 1277109e3765SNeilBrown if (mddev->gendisk) 1278109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(read_bio->bi_bdev), 1279109e3765SNeilBrown read_bio, disk_devt(mddev->gendisk), 1280109e3765SNeilBrown r1_bio->sector); 1281109e3765SNeilBrown 12821da177e4SLinus Torvalds generic_make_request(read_bio); 12831da177e4SLinus Torvalds } 12841da177e4SLinus Torvalds 1285c230e7e5SNeilBrown static void raid1_write_request(struct mddev *mddev, struct bio *bio, 1286c230e7e5SNeilBrown int max_write_sectors) 12873b046a97SRobert LeBlanc { 12883b046a97SRobert LeBlanc struct r1conf *conf = mddev->private; 1289fd76863eScolyli@suse.de struct r1bio *r1_bio; 12903b046a97SRobert LeBlanc int i, disks; 12913b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 12923b046a97SRobert LeBlanc unsigned long flags; 12933b046a97SRobert LeBlanc struct md_rdev *blocked_rdev; 12943b046a97SRobert LeBlanc struct blk_plug_cb *cb; 12953b046a97SRobert LeBlanc struct raid1_plug_cb *plug = NULL; 12963b046a97SRobert LeBlanc int first_clone; 12973b046a97SRobert LeBlanc int max_sectors; 12983b046a97SRobert LeBlanc 12991da177e4SLinus Torvalds /* 13003b046a97SRobert LeBlanc * Register the new request and wait if the reconstruction 13013b046a97SRobert LeBlanc * thread has put up a bar for new requests. 13023b046a97SRobert LeBlanc * Continue immediately if no resync is active currently. 13031da177e4SLinus Torvalds */ 13043b046a97SRobert LeBlanc 13053b046a97SRobert LeBlanc md_write_start(mddev, bio); /* wait on superblock update early */ 13063b046a97SRobert LeBlanc 13073b046a97SRobert LeBlanc if ((bio_end_sector(bio) > mddev->suspend_lo && 13083b046a97SRobert LeBlanc bio->bi_iter.bi_sector < mddev->suspend_hi) || 13093b046a97SRobert LeBlanc (mddev_is_clustered(mddev) && 13103b046a97SRobert LeBlanc md_cluster_ops->area_resyncing(mddev, WRITE, 13113b046a97SRobert LeBlanc bio->bi_iter.bi_sector, bio_end_sector(bio)))) { 13123b046a97SRobert LeBlanc 13133b046a97SRobert LeBlanc /* 13143b046a97SRobert LeBlanc * As the suspend_* range is controlled by userspace, we want 13153b046a97SRobert LeBlanc * an interruptible wait. 13163b046a97SRobert LeBlanc */ 13173b046a97SRobert LeBlanc DEFINE_WAIT(w); 13183b046a97SRobert LeBlanc for (;;) { 13193b046a97SRobert LeBlanc flush_signals(current); 13203b046a97SRobert LeBlanc prepare_to_wait(&conf->wait_barrier, 13213b046a97SRobert LeBlanc &w, TASK_INTERRUPTIBLE); 13223b046a97SRobert LeBlanc if (bio_end_sector(bio) <= mddev->suspend_lo || 13233b046a97SRobert LeBlanc bio->bi_iter.bi_sector >= mddev->suspend_hi || 13243b046a97SRobert LeBlanc (mddev_is_clustered(mddev) && 13253b046a97SRobert LeBlanc !md_cluster_ops->area_resyncing(mddev, WRITE, 13263b046a97SRobert LeBlanc bio->bi_iter.bi_sector, 13273b046a97SRobert LeBlanc bio_end_sector(bio)))) 13283b046a97SRobert LeBlanc break; 13293b046a97SRobert LeBlanc schedule(); 13303b046a97SRobert LeBlanc } 13313b046a97SRobert LeBlanc finish_wait(&conf->wait_barrier, &w); 13323b046a97SRobert LeBlanc } 1333fd76863eScolyli@suse.de wait_barrier(conf, bio->bi_iter.bi_sector); 1334fd76863eScolyli@suse.de 1335fd76863eScolyli@suse.de r1_bio = alloc_r1bio(mddev, bio, 0); 1336c230e7e5SNeilBrown r1_bio->sectors = max_write_sectors; 1337fd76863eScolyli@suse.de 133834db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 133934db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 1340578b54adSNeilBrown raid1_log(mddev, "wait queued"); 134134db0cd6SNeilBrown wait_event(conf->wait_barrier, 134234db0cd6SNeilBrown conf->pending_count < max_queued_requests); 134334db0cd6SNeilBrown } 13441f68f0c4SNeilBrown /* first select target devices under rcu_lock and 13451da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 13461da177e4SLinus Torvalds * bios[x] to bio 13471f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 13481f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 13491f68f0c4SNeilBrown * blocks. 13501f68f0c4SNeilBrown * This potentially requires several writes to write around 13511f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 13521f68f0c4SNeilBrown * with a set of bios attached. 13531da177e4SLinus Torvalds */ 1354c3b328acSNeilBrown 13558f19ccb2SNeilBrown disks = conf->raid_disks * 2; 13566bfe0b49SDan Williams retry_write: 13576bfe0b49SDan Williams blocked_rdev = NULL; 13581da177e4SLinus Torvalds rcu_read_lock(); 13591f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 13601da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 13613cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 13626bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 13636bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 13646bfe0b49SDan Williams blocked_rdev = rdev; 13656bfe0b49SDan Williams break; 13666bfe0b49SDan Williams } 13671da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 13688ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) { 13698f19ccb2SNeilBrown if (i < conf->raid_disks) 13701f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 13711f68f0c4SNeilBrown continue; 1372964147d5SNeilBrown } 13731f68f0c4SNeilBrown 13741f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 13751f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 13761f68f0c4SNeilBrown sector_t first_bad; 13771f68f0c4SNeilBrown int bad_sectors; 13781f68f0c4SNeilBrown int is_bad; 13791f68f0c4SNeilBrown 13803b046a97SRobert LeBlanc is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, 13811f68f0c4SNeilBrown &first_bad, &bad_sectors); 13821f68f0c4SNeilBrown if (is_bad < 0) { 13831f68f0c4SNeilBrown /* mustn't write here until the bad block is 13841f68f0c4SNeilBrown * acknowledged*/ 13851f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 13861f68f0c4SNeilBrown blocked_rdev = rdev; 13871f68f0c4SNeilBrown break; 13881f68f0c4SNeilBrown } 13891f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 13901f68f0c4SNeilBrown /* Cannot write here at all */ 13911f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 13921f68f0c4SNeilBrown if (bad_sectors < max_sectors) 13931f68f0c4SNeilBrown /* mustn't write more than bad_sectors 13941f68f0c4SNeilBrown * to other devices yet 13951f68f0c4SNeilBrown */ 13961f68f0c4SNeilBrown max_sectors = bad_sectors; 13971f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 13981f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 13991f68f0c4SNeilBrown * only applies if the disk is 14001f68f0c4SNeilBrown * missing, so it might be re-added, 14011f68f0c4SNeilBrown * and we want to know to recover this 14021f68f0c4SNeilBrown * chunk. 14031f68f0c4SNeilBrown * In this case the device is here, 14041f68f0c4SNeilBrown * and the fact that this chunk is not 14051f68f0c4SNeilBrown * in-sync is recorded in the bad 14061f68f0c4SNeilBrown * block log 14071f68f0c4SNeilBrown */ 14081f68f0c4SNeilBrown continue; 14091f68f0c4SNeilBrown } 14101f68f0c4SNeilBrown if (is_bad) { 14111f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 14121f68f0c4SNeilBrown if (good_sectors < max_sectors) 14131f68f0c4SNeilBrown max_sectors = good_sectors; 14141f68f0c4SNeilBrown } 14151f68f0c4SNeilBrown } 14161f68f0c4SNeilBrown r1_bio->bios[i] = bio; 14171da177e4SLinus Torvalds } 14181da177e4SLinus Torvalds rcu_read_unlock(); 14191da177e4SLinus Torvalds 14206bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 14216bfe0b49SDan Williams /* Wait for this device to become unblocked */ 14226bfe0b49SDan Williams int j; 14236bfe0b49SDan Williams 14246bfe0b49SDan Williams for (j = 0; j < i; j++) 14256bfe0b49SDan Williams if (r1_bio->bios[j]) 14266bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 14271f68f0c4SNeilBrown r1_bio->state = 0; 1428fd76863eScolyli@suse.de allow_barrier(conf, bio->bi_iter.bi_sector); 1429578b54adSNeilBrown raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); 14306bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 1431fd76863eScolyli@suse.de wait_barrier(conf, bio->bi_iter.bi_sector); 14326bfe0b49SDan Williams goto retry_write; 14336bfe0b49SDan Williams } 14346bfe0b49SDan Williams 1435c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1436c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1437c230e7e5SNeilBrown GFP_NOIO, conf->bio_split); 1438c230e7e5SNeilBrown bio_chain(split, bio); 1439c230e7e5SNeilBrown generic_make_request(bio); 1440c230e7e5SNeilBrown bio = split; 1441c230e7e5SNeilBrown r1_bio->master_bio = bio; 14421f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 1443c230e7e5SNeilBrown } 14444b6d287fSNeilBrown 14454e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 14464b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1447191ea9b2SNeilBrown 14481f68f0c4SNeilBrown first_clone = 1; 1449d8c84c4fSMing Lei 14501da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 14518e58e327SMing Lei struct bio *mbio = NULL; 14521da177e4SLinus Torvalds if (!r1_bio->bios[i]) 14531da177e4SLinus Torvalds continue; 14541da177e4SLinus Torvalds 14551da177e4SLinus Torvalds 14561f68f0c4SNeilBrown if (first_clone) { 14571f68f0c4SNeilBrown /* do behind I/O ? 14581f68f0c4SNeilBrown * Not if there are too many, or cannot 14591f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 14601f68f0c4SNeilBrown * is waiting for behind writes to flush */ 14611f68f0c4SNeilBrown if (bitmap && 14621f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 14631f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 14648e58e327SMing Lei !waitqueue_active(&bitmap->behind_wait)) { 1465841c1316SMing Lei mbio = alloc_behind_master_bio(r1_bio, bio, 1466c230e7e5SNeilBrown 0, 14671ec49223SShaohua Li max_sectors << 9); 14688e58e327SMing Lei } 14691da177e4SLinus Torvalds 14701f68f0c4SNeilBrown bitmap_startwrite(bitmap, r1_bio->sector, 14711f68f0c4SNeilBrown r1_bio->sectors, 14721f68f0c4SNeilBrown test_bit(R1BIO_BehindIO, 14731f68f0c4SNeilBrown &r1_bio->state)); 14741f68f0c4SNeilBrown first_clone = 0; 14751f68f0c4SNeilBrown } 14768e58e327SMing Lei 14778e58e327SMing Lei if (!mbio) { 1478841c1316SMing Lei if (r1_bio->behind_master_bio) 1479841c1316SMing Lei mbio = bio_clone_fast(r1_bio->behind_master_bio, 1480841c1316SMing Lei GFP_NOIO, 1481841c1316SMing Lei mddev->bio_set); 1482c230e7e5SNeilBrown else 1483d7a10308SMing Lei mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); 14841ec49223SShaohua Li } 14858e58e327SMing Lei 1486841c1316SMing Lei if (r1_bio->behind_master_bio) { 14874b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 14884b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 14894b6d287fSNeilBrown } 14904b6d287fSNeilBrown 14911f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 14921f68f0c4SNeilBrown 14934f024f37SKent Overstreet mbio->bi_iter.bi_sector = (r1_bio->sector + 14941f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 1495109e3765SNeilBrown mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 14961f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 1497a682e003SLinus Torvalds mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); 1498212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && 1499212e7eb7SNeilBrown !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && 1500212e7eb7SNeilBrown conf->raid_disks - mddev->degraded > 1) 1501212e7eb7SNeilBrown mbio->bi_opf |= MD_FAILFAST; 15021f68f0c4SNeilBrown mbio->bi_private = r1_bio; 15031f68f0c4SNeilBrown 15041da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1505f54a9d0eSNeilBrown 1506109e3765SNeilBrown if (mddev->gendisk) 1507109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(mbio->bi_bdev), 1508109e3765SNeilBrown mbio, disk_devt(mddev->gendisk), 1509109e3765SNeilBrown r1_bio->sector); 1510109e3765SNeilBrown /* flush_pending_writes() needs access to the rdev so...*/ 1511109e3765SNeilBrown mbio->bi_bdev = (void*)conf->mirrors[i].rdev; 1512109e3765SNeilBrown 1513f54a9d0eSNeilBrown cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); 1514f54a9d0eSNeilBrown if (cb) 1515f54a9d0eSNeilBrown plug = container_of(cb, struct raid1_plug_cb, cb); 1516f54a9d0eSNeilBrown else 1517f54a9d0eSNeilBrown plug = NULL; 1518191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1519f54a9d0eSNeilBrown if (plug) { 1520f54a9d0eSNeilBrown bio_list_add(&plug->pending, mbio); 1521f54a9d0eSNeilBrown plug->pending_cnt++; 1522f54a9d0eSNeilBrown } else { 15234e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 152434db0cd6SNeilBrown conf->pending_count++; 1525f54a9d0eSNeilBrown } 1526191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1527f54a9d0eSNeilBrown if (!plug) 1528b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 15294e78064fSNeilBrown } 15301f68f0c4SNeilBrown 1531079fa166SNeilBrown r1_bio_write_done(r1_bio); 1532079fa166SNeilBrown 1533079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1534079fa166SNeilBrown wake_up(&conf->wait_barrier); 15351da177e4SLinus Torvalds } 15361da177e4SLinus Torvalds 15373b046a97SRobert LeBlanc static void raid1_make_request(struct mddev *mddev, struct bio *bio) 15383b046a97SRobert LeBlanc { 1539fd76863eScolyli@suse.de sector_t sectors; 15403b046a97SRobert LeBlanc 1541aff8da09SShaohua Li if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { 1542aff8da09SShaohua Li md_flush_request(mddev, bio); 1543aff8da09SShaohua Li return; 1544aff8da09SShaohua Li } 15453b046a97SRobert LeBlanc 1546c230e7e5SNeilBrown /* 1547c230e7e5SNeilBrown * There is a limit to the maximum size, but 1548c230e7e5SNeilBrown * the read/write handler might find a lower limit 1549c230e7e5SNeilBrown * due to bad blocks. To avoid multiple splits, 1550c230e7e5SNeilBrown * we pass the maximum number of sectors down 1551c230e7e5SNeilBrown * and let the lower level perform the split. 1552c230e7e5SNeilBrown */ 1553fd76863eScolyli@suse.de sectors = align_to_barrier_unit_end( 1554fd76863eScolyli@suse.de bio->bi_iter.bi_sector, bio_sectors(bio)); 15553b046a97SRobert LeBlanc 1556c230e7e5SNeilBrown if (bio_data_dir(bio) == READ) 1557c230e7e5SNeilBrown raid1_read_request(mddev, bio, sectors); 1558c230e7e5SNeilBrown else 1559c230e7e5SNeilBrown raid1_write_request(mddev, bio, sectors); 15603b046a97SRobert LeBlanc } 15613b046a97SRobert LeBlanc 1562849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev) 15631da177e4SLinus Torvalds { 1564e8096360SNeilBrown struct r1conf *conf = mddev->private; 15651da177e4SLinus Torvalds int i; 15661da177e4SLinus Torvalds 15671da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 156811ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1569ddac7c7eSNeilBrown rcu_read_lock(); 1570ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 15713cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 15721da177e4SLinus Torvalds seq_printf(seq, "%s", 1573ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1574ddac7c7eSNeilBrown } 1575ddac7c7eSNeilBrown rcu_read_unlock(); 15761da177e4SLinus Torvalds seq_printf(seq, "]"); 15771da177e4SLinus Torvalds } 15781da177e4SLinus Torvalds 1579849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) 15801da177e4SLinus Torvalds { 15811da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1582e8096360SNeilBrown struct r1conf *conf = mddev->private; 1583423f04d6SNeilBrown unsigned long flags; 15841da177e4SLinus Torvalds 15851da177e4SLinus Torvalds /* 15861da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 15871da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 15881da177e4SLinus Torvalds * next level up know. 15891da177e4SLinus Torvalds * else mark the drive as failed 15901da177e4SLinus Torvalds */ 15912e52d449SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1592b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 15934044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 15941da177e4SLinus Torvalds /* 15951da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 15964044ba58SNeilBrown * normal single drive. 15974044ba58SNeilBrown * However don't try a recovery from this drive as 15984044ba58SNeilBrown * it is very likely to fail. 15991da177e4SLinus Torvalds */ 16005389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 16012e52d449SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16021da177e4SLinus Torvalds return; 16034044ba58SNeilBrown } 1604de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1605423f04d6SNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 16061da177e4SLinus Torvalds mddev->degraded++; 1607dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 16082446dba0SNeilBrown } else 16092446dba0SNeilBrown set_bit(Faulty, &rdev->flags); 1610423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16111da177e4SLinus Torvalds /* 16121da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 16131da177e4SLinus Torvalds */ 1614dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 16152953079cSShaohua Li set_mask_bits(&mddev->sb_flags, 0, 16162953079cSShaohua Li BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); 16171d41c216SNeilBrown pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" 1618067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 16199dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 16209dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 16211da177e4SLinus Torvalds } 16221da177e4SLinus Torvalds 1623e8096360SNeilBrown static void print_conf(struct r1conf *conf) 16241da177e4SLinus Torvalds { 16251da177e4SLinus Torvalds int i; 16261da177e4SLinus Torvalds 16271d41c216SNeilBrown pr_debug("RAID1 conf printout:\n"); 16281da177e4SLinus Torvalds if (!conf) { 16291d41c216SNeilBrown pr_debug("(!conf)\n"); 16301da177e4SLinus Torvalds return; 16311da177e4SLinus Torvalds } 16321d41c216SNeilBrown pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 16331da177e4SLinus Torvalds conf->raid_disks); 16341da177e4SLinus Torvalds 1635ddac7c7eSNeilBrown rcu_read_lock(); 16361da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 16371da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 16383cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1639ddac7c7eSNeilBrown if (rdev) 16401d41c216SNeilBrown pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", 1641ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1642ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1643ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 16441da177e4SLinus Torvalds } 1645ddac7c7eSNeilBrown rcu_read_unlock(); 16461da177e4SLinus Torvalds } 16471da177e4SLinus Torvalds 1648e8096360SNeilBrown static void close_sync(struct r1conf *conf) 16491da177e4SLinus Torvalds { 1650fd76863eScolyli@suse.de wait_all_barriers(conf); 1651fd76863eScolyli@suse.de allow_all_barriers(conf); 16521da177e4SLinus Torvalds 16531da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 16541da177e4SLinus Torvalds conf->r1buf_pool = NULL; 16551da177e4SLinus Torvalds } 16561da177e4SLinus Torvalds 1657fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 16581da177e4SLinus Torvalds { 16591da177e4SLinus Torvalds int i; 1660e8096360SNeilBrown struct r1conf *conf = mddev->private; 16616b965620SNeilBrown int count = 0; 16626b965620SNeilBrown unsigned long flags; 16631da177e4SLinus Torvalds 16641da177e4SLinus Torvalds /* 16651da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1666ddac7c7eSNeilBrown * and mark them readable. 1667ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 1668423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request 1669423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent. 16701da177e4SLinus Torvalds */ 1671423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 16721da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 16733cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 16748c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 16758c7a2c2bSNeilBrown if (repl 16761aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags) 16778c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 16788c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 16798c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 16808c7a2c2bSNeilBrown /* replacement has just become active */ 16818c7a2c2bSNeilBrown if (!rdev || 16828c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 16838c7a2c2bSNeilBrown count++; 16848c7a2c2bSNeilBrown if (rdev) { 16858c7a2c2bSNeilBrown /* Replaced device not technically 16868c7a2c2bSNeilBrown * faulty, but we need to be sure 16878c7a2c2bSNeilBrown * it gets removed and never re-added 16888c7a2c2bSNeilBrown */ 16898c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 16908c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 16918c7a2c2bSNeilBrown rdev->sysfs_state); 16928c7a2c2bSNeilBrown } 16938c7a2c2bSNeilBrown } 1694ddac7c7eSNeilBrown if (rdev 169561e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector 1696ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1697c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 16986b965620SNeilBrown count++; 1699654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 17001da177e4SLinus Torvalds } 17011da177e4SLinus Torvalds } 17026b965620SNeilBrown mddev->degraded -= count; 17036b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 17041da177e4SLinus Torvalds 17051da177e4SLinus Torvalds print_conf(conf); 17066b965620SNeilBrown return count; 17071da177e4SLinus Torvalds } 17081da177e4SLinus Torvalds 1709fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 17101da177e4SLinus Torvalds { 1711e8096360SNeilBrown struct r1conf *conf = mddev->private; 1712199050eaSNeil Brown int err = -EEXIST; 171341158c7eSNeilBrown int mirror = 0; 17140eaf822cSJonathan Brassow struct raid1_info *p; 17156c2fce2eSNeil Brown int first = 0; 171630194636SNeilBrown int last = conf->raid_disks - 1; 17171da177e4SLinus Torvalds 17185389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 17195389042fSNeilBrown return -EBUSY; 17205389042fSNeilBrown 17211501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev)) 17221501efadSDan Williams return -ENXIO; 17231501efadSDan Williams 17246c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 17256c2fce2eSNeil Brown first = last = rdev->raid_disk; 17266c2fce2eSNeil Brown 172770bcecdbSGoldwyn Rodrigues /* 172870bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk 172970bcecdbSGoldwyn Rodrigues * if possible. 173070bcecdbSGoldwyn Rodrigues */ 173170bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 && 173270bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first && 173370bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL) 173470bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk; 173570bcecdbSGoldwyn Rodrigues 17367ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 17377ef449d1SNeilBrown p = conf->mirrors+mirror; 17387ef449d1SNeilBrown if (!p->rdev) { 17391da177e4SLinus Torvalds 17409092c02dSJonathan Brassow if (mddev->gendisk) 17418f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 17428f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 17431da177e4SLinus Torvalds 17441da177e4SLinus Torvalds p->head_position = 0; 17451da177e4SLinus Torvalds rdev->raid_disk = mirror; 1746199050eaSNeil Brown err = 0; 17476aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 17486aea114aSNeilBrown * if this was recently any drive of the array 17496aea114aSNeilBrown */ 17506aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 175141158c7eSNeilBrown conf->fullsync = 1; 1752d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 17531da177e4SLinus Torvalds break; 17541da177e4SLinus Torvalds } 17557ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 17567ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 17577ef449d1SNeilBrown /* Add this device as a replacement */ 17587ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 17597ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 17607ef449d1SNeilBrown rdev->raid_disk = mirror; 17617ef449d1SNeilBrown err = 0; 17627ef449d1SNeilBrown conf->fullsync = 1; 17637ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 17647ef449d1SNeilBrown break; 17657ef449d1SNeilBrown } 17667ef449d1SNeilBrown } 17679092c02dSJonathan Brassow if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) 17682ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); 17691da177e4SLinus Torvalds print_conf(conf); 1770199050eaSNeil Brown return err; 17711da177e4SLinus Torvalds } 17721da177e4SLinus Torvalds 1773b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 17741da177e4SLinus Torvalds { 1775e8096360SNeilBrown struct r1conf *conf = mddev->private; 17761da177e4SLinus Torvalds int err = 0; 1777b8321b68SNeilBrown int number = rdev->raid_disk; 17780eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 17791da177e4SLinus Torvalds 1780b014f14cSNeilBrown if (rdev != p->rdev) 1781b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1782b014f14cSNeilBrown 17831da177e4SLinus Torvalds print_conf(conf); 1784b8321b68SNeilBrown if (rdev == p->rdev) { 1785b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 17861da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 17871da177e4SLinus Torvalds err = -EBUSY; 17881da177e4SLinus Torvalds goto abort; 17891da177e4SLinus Torvalds } 1790046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1791dfc70645SNeilBrown * is not possible. 1792dfc70645SNeilBrown */ 1793dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 17945389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1795dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1796dfc70645SNeilBrown err = -EBUSY; 1797dfc70645SNeilBrown goto abort; 1798dfc70645SNeilBrown } 17991da177e4SLinus Torvalds p->rdev = NULL; 1800d787be40SNeilBrown if (!test_bit(RemoveSynchronized, &rdev->flags)) { 1801fbd568a3SPaul E. McKenney synchronize_rcu(); 18021da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 18031da177e4SLinus Torvalds /* lost the race, try later */ 18041da177e4SLinus Torvalds err = -EBUSY; 18051da177e4SLinus Torvalds p->rdev = rdev; 1806ac5e7113SAndre Noll goto abort; 1807d787be40SNeilBrown } 1808d787be40SNeilBrown } 1809d787be40SNeilBrown if (conf->mirrors[conf->raid_disks + number].rdev) { 18108c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 18118c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 18128c7a2c2bSNeilBrown * doing this to avoid confusion. 18138c7a2c2bSNeilBrown */ 18148c7a2c2bSNeilBrown struct md_rdev *repl = 18158c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 1816e2d59925SNeilBrown freeze_array(conf, 0); 18178c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 18188c7a2c2bSNeilBrown p->rdev = repl; 18198c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 1820e2d59925SNeilBrown unfreeze_array(conf); 1821b014f14cSNeilBrown clear_bit(WantReplacement, &rdev->flags); 18228c7a2c2bSNeilBrown } else 18238c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1824a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 18251da177e4SLinus Torvalds } 18261da177e4SLinus Torvalds abort: 18271da177e4SLinus Torvalds 18281da177e4SLinus Torvalds print_conf(conf); 18291da177e4SLinus Torvalds return err; 18301da177e4SLinus Torvalds } 18311da177e4SLinus Torvalds 18324246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio) 18331da177e4SLinus Torvalds { 183498d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 18351da177e4SLinus Torvalds 18360fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1837ba3ae3beSNamhyung Kim 18381da177e4SLinus Torvalds /* 18391da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 18401da177e4SLinus Torvalds * or re-read if the read failed. 18411da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 18421da177e4SLinus Torvalds */ 18434246a0b6SChristoph Hellwig if (!bio->bi_error) 18441da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1845d11c171eSNeilBrown 1846d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 18471da177e4SLinus Torvalds reschedule_retry(r1_bio); 18481da177e4SLinus Torvalds } 18491da177e4SLinus Torvalds 18504246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio) 18511da177e4SLinus Torvalds { 18524246a0b6SChristoph Hellwig int uptodate = !bio->bi_error; 185398d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 1854fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1855e8096360SNeilBrown struct r1conf *conf = mddev->private; 18564367af55SNeilBrown sector_t first_bad; 18574367af55SNeilBrown int bad_sectors; 1858854abd75SNeilBrown struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; 1859ba3ae3beSNamhyung Kim 18606b1117d5SNeilBrown if (!uptodate) { 186157dab0bdSNeilBrown sector_t sync_blocks = 0; 18626b1117d5SNeilBrown sector_t s = r1_bio->sector; 18636b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 18646b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 18656b1117d5SNeilBrown do { 18665e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 18676b1117d5SNeilBrown &sync_blocks, 1); 18686b1117d5SNeilBrown s += sync_blocks; 18696b1117d5SNeilBrown sectors_to_go -= sync_blocks; 18706b1117d5SNeilBrown } while (sectors_to_go > 0); 1871854abd75SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1872854abd75SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 187319d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 187419d67169SNeilBrown mddev->recovery); 1875d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 1876854abd75SNeilBrown } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 18773a9f28a5SNeilBrown &first_bad, &bad_sectors) && 18783a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 18793a9f28a5SNeilBrown r1_bio->sector, 18803a9f28a5SNeilBrown r1_bio->sectors, 18813a9f28a5SNeilBrown &first_bad, &bad_sectors) 18823a9f28a5SNeilBrown ) 18834367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1884e3b9703eSNeilBrown 18851da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 18864367af55SNeilBrown int s = r1_bio->sectors; 1887d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1888d8f05d29SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 18894367af55SNeilBrown reschedule_retry(r1_bio); 18904367af55SNeilBrown else { 18911da177e4SLinus Torvalds put_buf(r1_bio); 189273d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 18931da177e4SLinus Torvalds } 18941da177e4SLinus Torvalds } 18954367af55SNeilBrown } 18961da177e4SLinus Torvalds 18973cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1898d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1899d8f05d29SNeilBrown { 1900796a5cf0SMike Christie if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) 1901d8f05d29SNeilBrown /* success */ 1902d8f05d29SNeilBrown return 1; 190319d67169SNeilBrown if (rw == WRITE) { 1904d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 190519d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 190619d67169SNeilBrown &rdev->flags)) 190719d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 190819d67169SNeilBrown rdev->mddev->recovery); 190919d67169SNeilBrown } 1910d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1911d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1912d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1913d8f05d29SNeilBrown return 0; 1914d8f05d29SNeilBrown } 1915d8f05d29SNeilBrown 19169f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 19171da177e4SLinus Torvalds { 1918a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 191969382e85SNeilBrown * good data, much like with normal read errors. Only 1920ddac7c7eSNeilBrown * read into the pages we already have so we don't 192169382e85SNeilBrown * need to re-issue the read request. 192269382e85SNeilBrown * We don't need to freeze the array, because being in an 192369382e85SNeilBrown * active sync request, there is no normal IO, and 192469382e85SNeilBrown * no overlapping syncs. 192506f60385SNeilBrown * We don't need to check is_badblock() again as we 192606f60385SNeilBrown * made sure that anything with a bad block in range 192706f60385SNeilBrown * will have bi_end_io clear. 19281da177e4SLinus Torvalds */ 1929fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1930e8096360SNeilBrown struct r1conf *conf = mddev->private; 1931a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 193244cf0f4dSMing Lei struct page **pages = get_resync_pages(bio)->pages; 193369382e85SNeilBrown sector_t sect = r1_bio->sector; 193469382e85SNeilBrown int sectors = r1_bio->sectors; 193569382e85SNeilBrown int idx = 0; 19362e52d449SNeilBrown struct md_rdev *rdev; 19372e52d449SNeilBrown 19382e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 19392e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) { 19402e52d449SNeilBrown /* Don't try recovering from here - just fail it 19412e52d449SNeilBrown * ... unless it is the last working device of course */ 19422e52d449SNeilBrown md_error(mddev, rdev); 19432e52d449SNeilBrown if (test_bit(Faulty, &rdev->flags)) 19442e52d449SNeilBrown /* Don't try to read from here, but make sure 19452e52d449SNeilBrown * put_buf does it's thing 19462e52d449SNeilBrown */ 19472e52d449SNeilBrown bio->bi_end_io = end_sync_write; 19482e52d449SNeilBrown } 194969382e85SNeilBrown 195069382e85SNeilBrown while(sectors) { 195169382e85SNeilBrown int s = sectors; 195269382e85SNeilBrown int d = r1_bio->read_disk; 195369382e85SNeilBrown int success = 0; 195478d7f5f7SNeilBrown int start; 195569382e85SNeilBrown 195669382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 195769382e85SNeilBrown s = PAGE_SIZE >> 9; 195869382e85SNeilBrown do { 195969382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1960ddac7c7eSNeilBrown /* No rcu protection needed here devices 1961ddac7c7eSNeilBrown * can only be removed when no resync is 1962ddac7c7eSNeilBrown * active, and resync is currently active 1963ddac7c7eSNeilBrown */ 196469382e85SNeilBrown rdev = conf->mirrors[d].rdev; 19659d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 196644cf0f4dSMing Lei pages[idx], 1967796a5cf0SMike Christie REQ_OP_READ, 0, false)) { 196869382e85SNeilBrown success = 1; 196969382e85SNeilBrown break; 197069382e85SNeilBrown } 197169382e85SNeilBrown } 197269382e85SNeilBrown d++; 19738f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 197469382e85SNeilBrown d = 0; 197569382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 197669382e85SNeilBrown 197778d7f5f7SNeilBrown if (!success) { 197878d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 19793a9f28a5SNeilBrown int abort = 0; 19803a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 19813a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 19823a9f28a5SNeilBrown * work just disable and interrupt the recovery. 19833a9f28a5SNeilBrown * Don't fail devices as that won't really help. 19843a9f28a5SNeilBrown */ 19851d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 198678d7f5f7SNeilBrown mdname(mddev), 198778d7f5f7SNeilBrown bdevname(bio->bi_bdev, b), 198878d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 19898f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 19903a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 19913a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 19923a9f28a5SNeilBrown continue; 19933a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 19943a9f28a5SNeilBrown abort = 1; 19953a9f28a5SNeilBrown } 19963a9f28a5SNeilBrown if (abort) { 1997d890fa2bSNeilBrown conf->recovery_disabled = 1998d890fa2bSNeilBrown mddev->recovery_disabled; 19993a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 200078d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 200178d7f5f7SNeilBrown put_buf(r1_bio); 200278d7f5f7SNeilBrown return 0; 200378d7f5f7SNeilBrown } 20043a9f28a5SNeilBrown /* Try next page */ 20053a9f28a5SNeilBrown sectors -= s; 20063a9f28a5SNeilBrown sect += s; 20073a9f28a5SNeilBrown idx++; 20083a9f28a5SNeilBrown continue; 20093a9f28a5SNeilBrown } 201078d7f5f7SNeilBrown 201178d7f5f7SNeilBrown start = d; 201269382e85SNeilBrown /* write it back and re-read */ 201369382e85SNeilBrown while (d != r1_bio->read_disk) { 201469382e85SNeilBrown if (d == 0) 20158f19ccb2SNeilBrown d = conf->raid_disks * 2; 201669382e85SNeilBrown d--; 201769382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 201869382e85SNeilBrown continue; 201969382e85SNeilBrown rdev = conf->mirrors[d].rdev; 2020d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 202144cf0f4dSMing Lei pages[idx], 2022d8f05d29SNeilBrown WRITE) == 0) { 202378d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 202478d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 20259d3d8011SNamhyung Kim } 2026097426f6SNeilBrown } 2027097426f6SNeilBrown d = start; 2028097426f6SNeilBrown while (d != r1_bio->read_disk) { 2029097426f6SNeilBrown if (d == 0) 20308f19ccb2SNeilBrown d = conf->raid_disks * 2; 2031097426f6SNeilBrown d--; 2032097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 2033097426f6SNeilBrown continue; 2034097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 2035d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 203644cf0f4dSMing Lei pages[idx], 2037d8f05d29SNeilBrown READ) != 0) 20389d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 203969382e85SNeilBrown } 204069382e85SNeilBrown sectors -= s; 204169382e85SNeilBrown sect += s; 204269382e85SNeilBrown idx ++; 204369382e85SNeilBrown } 204478d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 20454246a0b6SChristoph Hellwig bio->bi_error = 0; 2046a68e5870SNeilBrown return 1; 204769382e85SNeilBrown } 2048d11c171eSNeilBrown 2049c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio) 2050a68e5870SNeilBrown { 2051a68e5870SNeilBrown /* We have read all readable devices. If we haven't 2052a68e5870SNeilBrown * got the block, then there is no hope left. 2053a68e5870SNeilBrown * If we have, then we want to do a comparison 2054a68e5870SNeilBrown * and skip the write if everything is the same. 2055a68e5870SNeilBrown * If any blocks failed to read, then we need to 2056a68e5870SNeilBrown * attempt an over-write 2057a68e5870SNeilBrown */ 2058fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2059e8096360SNeilBrown struct r1conf *conf = mddev->private; 2060a68e5870SNeilBrown int primary; 2061a68e5870SNeilBrown int i; 2062f4380a91Smajianpeng int vcnt; 2063a68e5870SNeilBrown 206430bc9b53SNeilBrown /* Fix variable parts of all bios */ 206530bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 206630bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 206730bc9b53SNeilBrown int j; 206830bc9b53SNeilBrown int size; 20694246a0b6SChristoph Hellwig int error; 207060928a91SMing Lei struct bio_vec *bi; 207130bc9b53SNeilBrown struct bio *b = r1_bio->bios[i]; 207298d30c58SMing Lei struct resync_pages *rp = get_resync_pages(b); 207330bc9b53SNeilBrown if (b->bi_end_io != end_sync_read) 207430bc9b53SNeilBrown continue; 20754246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */ 20764246a0b6SChristoph Hellwig error = b->bi_error; 207730bc9b53SNeilBrown bio_reset(b); 20784246a0b6SChristoph Hellwig b->bi_error = error; 207930bc9b53SNeilBrown b->bi_vcnt = vcnt; 20804f024f37SKent Overstreet b->bi_iter.bi_size = r1_bio->sectors << 9; 20814f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector + 208230bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset; 208330bc9b53SNeilBrown b->bi_bdev = conf->mirrors[i].rdev->bdev; 208430bc9b53SNeilBrown b->bi_end_io = end_sync_read; 208598d30c58SMing Lei rp->raid_bio = r1_bio; 208698d30c58SMing Lei b->bi_private = rp; 208730bc9b53SNeilBrown 20884f024f37SKent Overstreet size = b->bi_iter.bi_size; 208960928a91SMing Lei bio_for_each_segment_all(bi, b, j) { 209030bc9b53SNeilBrown bi->bv_offset = 0; 209130bc9b53SNeilBrown if (size > PAGE_SIZE) 209230bc9b53SNeilBrown bi->bv_len = PAGE_SIZE; 209330bc9b53SNeilBrown else 209430bc9b53SNeilBrown bi->bv_len = size; 209530bc9b53SNeilBrown size -= PAGE_SIZE; 209630bc9b53SNeilBrown } 209730bc9b53SNeilBrown } 20988f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 2099a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 21004246a0b6SChristoph Hellwig !r1_bio->bios[primary]->bi_error) { 2101a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 2102a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 2103a68e5870SNeilBrown break; 2104a68e5870SNeilBrown } 2105a68e5870SNeilBrown r1_bio->read_disk = primary; 21068f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2107a68e5870SNeilBrown int j; 2108a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 2109a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 21104246a0b6SChristoph Hellwig int error = sbio->bi_error; 211144cf0f4dSMing Lei struct page **ppages = get_resync_pages(pbio)->pages; 211244cf0f4dSMing Lei struct page **spages = get_resync_pages(sbio)->pages; 211360928a91SMing Lei struct bio_vec *bi; 21148fc04e6eSMing Lei int page_len[RESYNC_PAGES] = { 0 }; 211578d7f5f7SNeilBrown 21162aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read) 211778d7f5f7SNeilBrown continue; 21184246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */ 21194246a0b6SChristoph Hellwig sbio->bi_error = 0; 2120a68e5870SNeilBrown 212160928a91SMing Lei bio_for_each_segment_all(bi, sbio, j) 212260928a91SMing Lei page_len[j] = bi->bv_len; 212360928a91SMing Lei 21244246a0b6SChristoph Hellwig if (!error) { 2125a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 212644cf0f4dSMing Lei if (memcmp(page_address(ppages[j]), 212744cf0f4dSMing Lei page_address(spages[j]), 212860928a91SMing Lei page_len[j])) 2129a68e5870SNeilBrown break; 2130a68e5870SNeilBrown } 2131a68e5870SNeilBrown } else 2132a68e5870SNeilBrown j = 0; 2133a68e5870SNeilBrown if (j >= 0) 21347f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); 2135a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 21364246a0b6SChristoph Hellwig && !error)) { 213778d7f5f7SNeilBrown /* No need to write to this device. */ 2138a68e5870SNeilBrown sbio->bi_end_io = NULL; 2139a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 214078d7f5f7SNeilBrown continue; 214178d7f5f7SNeilBrown } 2142d3b45c2aSKent Overstreet 2143d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio); 2144a68e5870SNeilBrown } 2145a68e5870SNeilBrown } 2146a68e5870SNeilBrown 21479f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 2148a68e5870SNeilBrown { 2149e8096360SNeilBrown struct r1conf *conf = mddev->private; 2150a68e5870SNeilBrown int i; 21518f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 2152a68e5870SNeilBrown struct bio *bio, *wbio; 2153a68e5870SNeilBrown 2154a68e5870SNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2155a68e5870SNeilBrown 2156a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2157a68e5870SNeilBrown /* ouch - failed to read all of that. */ 2158a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 2159a68e5870SNeilBrown return; 21607ca78d57SNeilBrown 21617ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2162c95e6385SNeilBrown process_checks(r1_bio); 2163c95e6385SNeilBrown 2164d11c171eSNeilBrown /* 2165d11c171eSNeilBrown * schedule writes 2166d11c171eSNeilBrown */ 21671da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 21681da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 21691da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 21703e198f78SNeilBrown if (wbio->bi_end_io == NULL || 21713e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 21723e198f78SNeilBrown (i == r1_bio->read_disk || 21733e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 21741da177e4SLinus Torvalds continue; 21750c9d5b12SNeilBrown if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 21760c9d5b12SNeilBrown continue; 21771da177e4SLinus Torvalds 2178796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 2179212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) 2180212e7eb7SNeilBrown wbio->bi_opf |= MD_FAILFAST; 2181212e7eb7SNeilBrown 21823e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 21831da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 2184aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); 2185191ea9b2SNeilBrown 21861da177e4SLinus Torvalds generic_make_request(wbio); 21871da177e4SLinus Torvalds } 21881da177e4SLinus Torvalds 21891da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 2190191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 219158e94ae1SNeilBrown int s = r1_bio->sectors; 219258e94ae1SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 219358e94ae1SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 219458e94ae1SNeilBrown reschedule_retry(r1_bio); 219558e94ae1SNeilBrown else { 21961da177e4SLinus Torvalds put_buf(r1_bio); 219758e94ae1SNeilBrown md_done_sync(mddev, s, 1); 219858e94ae1SNeilBrown } 21991da177e4SLinus Torvalds } 22001da177e4SLinus Torvalds } 22011da177e4SLinus Torvalds 22021da177e4SLinus Torvalds /* 22031da177e4SLinus Torvalds * This is a kernel thread which: 22041da177e4SLinus Torvalds * 22051da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 22061da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 2207d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 22081da177e4SLinus Torvalds */ 22091da177e4SLinus Torvalds 2210e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 2211867868fbSNeilBrown sector_t sect, int sectors) 2212867868fbSNeilBrown { 2213fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 2214867868fbSNeilBrown while(sectors) { 2215867868fbSNeilBrown int s = sectors; 2216867868fbSNeilBrown int d = read_disk; 2217867868fbSNeilBrown int success = 0; 2218867868fbSNeilBrown int start; 22193cb03002SNeilBrown struct md_rdev *rdev; 2220867868fbSNeilBrown 2221867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 2222867868fbSNeilBrown s = PAGE_SIZE >> 9; 2223867868fbSNeilBrown 2224867868fbSNeilBrown do { 2225d2eb35acSNeilBrown sector_t first_bad; 2226d2eb35acSNeilBrown int bad_sectors; 2227d2eb35acSNeilBrown 2228707a6a42SNeilBrown rcu_read_lock(); 2229707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2230867868fbSNeilBrown if (rdev && 2231da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 2232da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 2233da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 2234d2eb35acSNeilBrown is_badblock(rdev, sect, s, 2235707a6a42SNeilBrown &first_bad, &bad_sectors) == 0) { 2236707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2237707a6a42SNeilBrown rcu_read_unlock(); 2238707a6a42SNeilBrown if (sync_page_io(rdev, sect, s<<9, 2239796a5cf0SMike Christie conf->tmppage, REQ_OP_READ, 0, false)) 2240867868fbSNeilBrown success = 1; 2241707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2242707a6a42SNeilBrown if (success) 2243707a6a42SNeilBrown break; 2244707a6a42SNeilBrown } else 2245707a6a42SNeilBrown rcu_read_unlock(); 2246867868fbSNeilBrown d++; 22478f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 2248867868fbSNeilBrown d = 0; 2249867868fbSNeilBrown } while (!success && d != read_disk); 2250867868fbSNeilBrown 2251867868fbSNeilBrown if (!success) { 2252d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 22533cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 2254d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 2255d8f05d29SNeilBrown md_error(mddev, rdev); 2256867868fbSNeilBrown break; 2257867868fbSNeilBrown } 2258867868fbSNeilBrown /* write it back and re-read */ 2259867868fbSNeilBrown start = d; 2260867868fbSNeilBrown while (d != read_disk) { 2261867868fbSNeilBrown if (d==0) 22628f19ccb2SNeilBrown d = conf->raid_disks * 2; 2263867868fbSNeilBrown d--; 2264707a6a42SNeilBrown rcu_read_lock(); 2265707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2266867868fbSNeilBrown if (rdev && 2267707a6a42SNeilBrown !test_bit(Faulty, &rdev->flags)) { 2268707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2269707a6a42SNeilBrown rcu_read_unlock(); 2270d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 2271d8f05d29SNeilBrown conf->tmppage, WRITE); 2272707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2273707a6a42SNeilBrown } else 2274707a6a42SNeilBrown rcu_read_unlock(); 2275867868fbSNeilBrown } 2276867868fbSNeilBrown d = start; 2277867868fbSNeilBrown while (d != read_disk) { 2278867868fbSNeilBrown char b[BDEVNAME_SIZE]; 2279867868fbSNeilBrown if (d==0) 22808f19ccb2SNeilBrown d = conf->raid_disks * 2; 2281867868fbSNeilBrown d--; 2282707a6a42SNeilBrown rcu_read_lock(); 2283707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2284867868fbSNeilBrown if (rdev && 2285b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) { 2286707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2287707a6a42SNeilBrown rcu_read_unlock(); 2288d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 2289d8f05d29SNeilBrown conf->tmppage, READ)) { 2290867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 22911d41c216SNeilBrown pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", 2292867868fbSNeilBrown mdname(mddev), s, 2293969b755aSRandy Dunlap (unsigned long long)(sect + 2294969b755aSRandy Dunlap rdev->data_offset), 2295867868fbSNeilBrown bdevname(rdev->bdev, b)); 2296867868fbSNeilBrown } 2297707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2298707a6a42SNeilBrown } else 2299707a6a42SNeilBrown rcu_read_unlock(); 2300867868fbSNeilBrown } 2301867868fbSNeilBrown sectors -= s; 2302867868fbSNeilBrown sect += s; 2303867868fbSNeilBrown } 2304867868fbSNeilBrown } 2305867868fbSNeilBrown 23069f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2307cd5ff9a1SNeilBrown { 2308fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2309e8096360SNeilBrown struct r1conf *conf = mddev->private; 23103cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2311cd5ff9a1SNeilBrown 2312cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2313cd5ff9a1SNeilBrown * we just recently had a write error. 2314cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2315cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2316cd5ff9a1SNeilBrown * a bad block. 2317cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2318cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2319cd5ff9a1SNeilBrown * 2320cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2321cd5ff9a1SNeilBrown */ 2322cd5ff9a1SNeilBrown 2323cd5ff9a1SNeilBrown int block_sectors; 2324cd5ff9a1SNeilBrown sector_t sector; 2325cd5ff9a1SNeilBrown int sectors; 2326cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2327cd5ff9a1SNeilBrown int ok = 1; 2328cd5ff9a1SNeilBrown 2329cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2330cd5ff9a1SNeilBrown return 0; 2331cd5ff9a1SNeilBrown 2332ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift, 2333ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9); 2334cd5ff9a1SNeilBrown sector = r1_bio->sector; 2335cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2336cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2337cd5ff9a1SNeilBrown - sector; 2338cd5ff9a1SNeilBrown 2339cd5ff9a1SNeilBrown while (sect_to_write) { 2340cd5ff9a1SNeilBrown struct bio *wbio; 2341cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2342cd5ff9a1SNeilBrown sectors = sect_to_write; 2343cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2344cd5ff9a1SNeilBrown 2345b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2346841c1316SMing Lei wbio = bio_clone_fast(r1_bio->behind_master_bio, 2347841c1316SMing Lei GFP_NOIO, 2348841c1316SMing Lei mddev->bio_set); 2349841c1316SMing Lei /* We really need a _all clone */ 2350841c1316SMing Lei wbio->bi_iter = (struct bvec_iter){ 0 }; 2351b783863fSKent Overstreet } else { 2352d7a10308SMing Lei wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, 2353d7a10308SMing Lei mddev->bio_set); 2354b783863fSKent Overstreet } 2355b783863fSKent Overstreet 2356796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 23574f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector; 23584f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9; 2359cd5ff9a1SNeilBrown 23606678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors); 23614f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset; 2362cd5ff9a1SNeilBrown wbio->bi_bdev = rdev->bdev; 23634e49ea4aSMike Christie 23644e49ea4aSMike Christie if (submit_bio_wait(wbio) < 0) 2365cd5ff9a1SNeilBrown /* failure! */ 2366cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2367cd5ff9a1SNeilBrown sectors, 0) 2368cd5ff9a1SNeilBrown && ok; 2369cd5ff9a1SNeilBrown 2370cd5ff9a1SNeilBrown bio_put(wbio); 2371cd5ff9a1SNeilBrown sect_to_write -= sectors; 2372cd5ff9a1SNeilBrown sector += sectors; 2373cd5ff9a1SNeilBrown sectors = block_sectors; 2374cd5ff9a1SNeilBrown } 2375cd5ff9a1SNeilBrown return ok; 2376cd5ff9a1SNeilBrown } 2377cd5ff9a1SNeilBrown 2378e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 237962096bceSNeilBrown { 238062096bceSNeilBrown int m; 238162096bceSNeilBrown int s = r1_bio->sectors; 23828f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 23833cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 238462096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 238562096bceSNeilBrown if (bio->bi_end_io == NULL) 238662096bceSNeilBrown continue; 23874246a0b6SChristoph Hellwig if (!bio->bi_error && 238862096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2389c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 239062096bceSNeilBrown } 23914246a0b6SChristoph Hellwig if (bio->bi_error && 239262096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 239362096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 239462096bceSNeilBrown md_error(conf->mddev, rdev); 239562096bceSNeilBrown } 239662096bceSNeilBrown } 239762096bceSNeilBrown put_buf(r1_bio); 239862096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 239962096bceSNeilBrown } 240062096bceSNeilBrown 2401e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 240262096bceSNeilBrown { 2403fd76863eScolyli@suse.de int m, idx; 240455ce74d4SNeilBrown bool fail = false; 2405fd76863eScolyli@suse.de 24068f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 240762096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 24083cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 240962096bceSNeilBrown rdev_clear_badblocks(rdev, 241062096bceSNeilBrown r1_bio->sector, 2411c6563a8cSNeilBrown r1_bio->sectors, 0); 241262096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 241362096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 241462096bceSNeilBrown /* This drive got a write error. We need to 241562096bceSNeilBrown * narrow down and record precise write 241662096bceSNeilBrown * errors. 241762096bceSNeilBrown */ 241855ce74d4SNeilBrown fail = true; 241962096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 242062096bceSNeilBrown md_error(conf->mddev, 242162096bceSNeilBrown conf->mirrors[m].rdev); 242262096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 242362096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 242462096bceSNeilBrown } 242562096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 242662096bceSNeilBrown conf->mddev); 242762096bceSNeilBrown } 242855ce74d4SNeilBrown if (fail) { 242955ce74d4SNeilBrown spin_lock_irq(&conf->device_lock); 243055ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list); 2431fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2432824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 243355ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock); 2434824e47daScolyli@suse.de /* 2435824e47daScolyli@suse.de * In case freeze_array() is waiting for condition 2436824e47daScolyli@suse.de * get_unqueued_pending() == extra to be true. 2437824e47daScolyli@suse.de */ 2438824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 243955ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread); 2440bd8688a1SNeilBrown } else { 2441bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2442bd8688a1SNeilBrown close_write(r1_bio); 244362096bceSNeilBrown raid_end_bio_io(r1_bio); 244462096bceSNeilBrown } 2445bd8688a1SNeilBrown } 244662096bceSNeilBrown 2447e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 244862096bceSNeilBrown { 244962096bceSNeilBrown int disk; 245062096bceSNeilBrown int max_sectors; 2451fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 245262096bceSNeilBrown struct bio *bio; 245362096bceSNeilBrown char b[BDEVNAME_SIZE]; 24543cb03002SNeilBrown struct md_rdev *rdev; 2455109e3765SNeilBrown dev_t bio_dev; 2456109e3765SNeilBrown sector_t bio_sector; 245762096bceSNeilBrown 245862096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 245962096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 246062096bceSNeilBrown * the block and we can fix it. 246162096bceSNeilBrown * We freeze all other IO, and try reading the block from 246262096bceSNeilBrown * other devices. When we find one, we re-write 246362096bceSNeilBrown * and check it that fixes the read error. 246462096bceSNeilBrown * This is all done synchronously while the array is 246562096bceSNeilBrown * frozen 246662096bceSNeilBrown */ 24677449f699STomasz Majchrzak 24687449f699STomasz Majchrzak bio = r1_bio->bios[r1_bio->read_disk]; 24697449f699STomasz Majchrzak bdevname(bio->bi_bdev, b); 2470109e3765SNeilBrown bio_dev = bio->bi_bdev->bd_dev; 2471109e3765SNeilBrown bio_sector = conf->mirrors[r1_bio->read_disk].rdev->data_offset + r1_bio->sector; 24727449f699STomasz Majchrzak bio_put(bio); 24737449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = NULL; 24747449f699STomasz Majchrzak 24752e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 24762e52d449SNeilBrown if (mddev->ro == 0 24772e52d449SNeilBrown && !test_bit(FailFast, &rdev->flags)) { 2478e2d59925SNeilBrown freeze_array(conf, 1); 247962096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 248062096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 248162096bceSNeilBrown unfreeze_array(conf); 24827449f699STomasz Majchrzak } else { 24837449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; 24847449f699STomasz Majchrzak } 24857449f699STomasz Majchrzak 24862e52d449SNeilBrown rdev_dec_pending(rdev, conf->mddev); 248762096bceSNeilBrown 248862096bceSNeilBrown read_more: 248962096bceSNeilBrown disk = read_balance(conf, r1_bio, &max_sectors); 249062096bceSNeilBrown if (disk == -1) { 24911d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 249262096bceSNeilBrown mdname(mddev), b, (unsigned long long)r1_bio->sector); 249362096bceSNeilBrown raid_end_bio_io(r1_bio); 249462096bceSNeilBrown } else { 249562096bceSNeilBrown const unsigned long do_sync 24961eff9d32SJens Axboe = r1_bio->master_bio->bi_opf & REQ_SYNC; 249762096bceSNeilBrown r1_bio->read_disk = disk; 2498d7a10308SMing Lei bio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, 2499d7a10308SMing Lei mddev->bio_set); 25004f024f37SKent Overstreet bio_trim(bio, r1_bio->sector - bio->bi_iter.bi_sector, 25014f024f37SKent Overstreet max_sectors); 250262096bceSNeilBrown r1_bio->bios[r1_bio->read_disk] = bio; 250362096bceSNeilBrown rdev = conf->mirrors[disk].rdev; 25041d41c216SNeilBrown pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", 250562096bceSNeilBrown mdname(mddev), 250662096bceSNeilBrown (unsigned long long)r1_bio->sector, 250762096bceSNeilBrown bdevname(rdev->bdev, b)); 25084f024f37SKent Overstreet bio->bi_iter.bi_sector = r1_bio->sector + rdev->data_offset; 250962096bceSNeilBrown bio->bi_bdev = rdev->bdev; 251062096bceSNeilBrown bio->bi_end_io = raid1_end_read_request; 2511796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, do_sync); 25122e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags) && 25132e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 25142e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 251562096bceSNeilBrown bio->bi_private = r1_bio; 251662096bceSNeilBrown if (max_sectors < r1_bio->sectors) { 251762096bceSNeilBrown /* Drat - have to split this up more */ 251862096bceSNeilBrown struct bio *mbio = r1_bio->master_bio; 251962096bceSNeilBrown int sectors_handled = (r1_bio->sector + max_sectors 25204f024f37SKent Overstreet - mbio->bi_iter.bi_sector); 252162096bceSNeilBrown r1_bio->sectors = max_sectors; 252237011e3aSNeilBrown bio_inc_remaining(mbio); 2523109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), 2524109e3765SNeilBrown bio, bio_dev, bio_sector); 252562096bceSNeilBrown generic_make_request(bio); 252662096bceSNeilBrown bio = NULL; 252762096bceSNeilBrown 2528fd76863eScolyli@suse.de r1_bio = alloc_r1bio(mddev, mbio, sectors_handled); 252962096bceSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 253037011e3aSNeilBrown inc_pending(conf, r1_bio->sector); 253162096bceSNeilBrown 253262096bceSNeilBrown goto read_more; 2533109e3765SNeilBrown } else { 2534109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(bio->bi_bdev), 2535109e3765SNeilBrown bio, bio_dev, bio_sector); 253662096bceSNeilBrown generic_make_request(bio); 253762096bceSNeilBrown } 253862096bceSNeilBrown } 2539109e3765SNeilBrown } 254062096bceSNeilBrown 25414ed8731dSShaohua Li static void raid1d(struct md_thread *thread) 25421da177e4SLinus Torvalds { 25434ed8731dSShaohua Li struct mddev *mddev = thread->mddev; 25449f2c9d12SNeilBrown struct r1bio *r1_bio; 25451da177e4SLinus Torvalds unsigned long flags; 2546e8096360SNeilBrown struct r1conf *conf = mddev->private; 25471da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2548e1dfa0a2SNeilBrown struct blk_plug plug; 2549fd76863eScolyli@suse.de int idx; 25501da177e4SLinus Torvalds 25511da177e4SLinus Torvalds md_check_recovery(mddev); 25521da177e4SLinus Torvalds 255355ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) && 25542953079cSShaohua Li !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { 255555ce74d4SNeilBrown LIST_HEAD(tmp); 255655ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 2557fd76863eScolyli@suse.de if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 2558fd76863eScolyli@suse.de list_splice_init(&conf->bio_end_io_list, &tmp); 255955ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 256055ce74d4SNeilBrown while (!list_empty(&tmp)) { 2561a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio, 2562a452744bSMikulas Patocka retry_list); 256355ce74d4SNeilBrown list_del(&r1_bio->retry_list); 2564fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2565824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 2566bd8688a1SNeilBrown if (mddev->degraded) 2567bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 2568bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2569bd8688a1SNeilBrown close_write(r1_bio); 257055ce74d4SNeilBrown raid_end_bio_io(r1_bio); 257155ce74d4SNeilBrown } 257255ce74d4SNeilBrown } 257355ce74d4SNeilBrown 2574e1dfa0a2SNeilBrown blk_start_plug(&plug); 25751da177e4SLinus Torvalds for (;;) { 2576a35e63efSNeilBrown 25777eaceaccSJens Axboe flush_pending_writes(conf); 2578a35e63efSNeilBrown 25791da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2580a35e63efSNeilBrown if (list_empty(head)) { 2581191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 25821da177e4SLinus Torvalds break; 2583a35e63efSNeilBrown } 25849f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 25851da177e4SLinus Torvalds list_del(head->prev); 2586fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2587824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 25881da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 25891da177e4SLinus Torvalds 25901da177e4SLinus Torvalds mddev = r1_bio->mddev; 2591070ec55dSNeilBrown conf = mddev->private; 25924367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2593d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 259462096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 259562096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 259662096bceSNeilBrown else 25971da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2598cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 259962096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 260062096bceSNeilBrown handle_write_finished(conf, r1_bio); 260162096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 260262096bceSNeilBrown handle_read_error(conf, r1_bio); 2603d2eb35acSNeilBrown else 2604c230e7e5SNeilBrown WARN_ON_ONCE(1); 260562096bceSNeilBrown 26061d9d5241SNeilBrown cond_resched(); 26072953079cSShaohua Li if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) 2608de393cdeSNeilBrown md_check_recovery(mddev); 26091da177e4SLinus Torvalds } 2610e1dfa0a2SNeilBrown blk_finish_plug(&plug); 26111da177e4SLinus Torvalds } 26121da177e4SLinus Torvalds 2613e8096360SNeilBrown static int init_resync(struct r1conf *conf) 26141da177e4SLinus Torvalds { 26151da177e4SLinus Torvalds int buffs; 26161da177e4SLinus Torvalds 26171da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 26189e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 26191da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 26201da177e4SLinus Torvalds conf->poolinfo); 26211da177e4SLinus Torvalds if (!conf->r1buf_pool) 26221da177e4SLinus Torvalds return -ENOMEM; 26231da177e4SLinus Torvalds return 0; 26241da177e4SLinus Torvalds } 26251da177e4SLinus Torvalds 26261da177e4SLinus Torvalds /* 26271da177e4SLinus Torvalds * perform a "sync" on one "block" 26281da177e4SLinus Torvalds * 26291da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 26301da177e4SLinus Torvalds * requests - conflict with active sync requests. 26311da177e4SLinus Torvalds * 26321da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 26331da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 26341da177e4SLinus Torvalds */ 26351da177e4SLinus Torvalds 2636849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 2637849674e4SShaohua Li int *skipped) 26381da177e4SLinus Torvalds { 2639e8096360SNeilBrown struct r1conf *conf = mddev->private; 26409f2c9d12SNeilBrown struct r1bio *r1_bio; 26411da177e4SLinus Torvalds struct bio *bio; 26421da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 26433e198f78SNeilBrown int disk = -1; 26441da177e4SLinus Torvalds int i; 26453e198f78SNeilBrown int wonly = -1; 26463e198f78SNeilBrown int write_targets = 0, read_targets = 0; 264757dab0bdSNeilBrown sector_t sync_blocks; 2648e3b9703eSNeilBrown int still_degraded = 0; 264906f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 265006f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 2651fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 26521da177e4SLinus Torvalds 26531da177e4SLinus Torvalds if (!conf->r1buf_pool) 26541da177e4SLinus Torvalds if (init_resync(conf)) 265557afd89fSNeilBrown return 0; 26561da177e4SLinus Torvalds 265758c0fed4SAndre Noll max_sector = mddev->dev_sectors; 26581da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2659191ea9b2SNeilBrown /* If we aborted, we need to abort the 2660191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2661191ea9b2SNeilBrown * only be one in raid1 resync. 2662191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2663191ea9b2SNeilBrown */ 26646a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 26656a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2666191ea9b2SNeilBrown &sync_blocks, 1); 26676a806c51SNeilBrown else /* completed sync */ 2668191ea9b2SNeilBrown conf->fullsync = 0; 26696a806c51SNeilBrown 26706a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 26711da177e4SLinus Torvalds close_sync(conf); 2672c40f341fSGoldwyn Rodrigues 2673c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) { 2674c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0; 2675c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0; 2676c40f341fSGoldwyn Rodrigues } 26771da177e4SLinus Torvalds return 0; 26781da177e4SLinus Torvalds } 26791da177e4SLinus Torvalds 268007d84d10SNeilBrown if (mddev->bitmap == NULL && 268107d84d10SNeilBrown mddev->recovery_cp == MaxSector && 26826394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 268307d84d10SNeilBrown conf->fullsync == 0) { 268407d84d10SNeilBrown *skipped = 1; 268507d84d10SNeilBrown return max_sector - sector_nr; 268607d84d10SNeilBrown } 26876394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 26886394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 26896394cca5SNeilBrown */ 2690e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2691e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2692191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2693191ea9b2SNeilBrown *skipped = 1; 2694191ea9b2SNeilBrown return sync_blocks; 2695191ea9b2SNeilBrown } 269617999be4SNeilBrown 26977ac50447STomasz Majchrzak /* 26987ac50447STomasz Majchrzak * If there is non-resync activity waiting for a turn, then let it 26997ac50447STomasz Majchrzak * though before starting on this new sync request. 27007ac50447STomasz Majchrzak */ 2701824e47daScolyli@suse.de if (atomic_read(&conf->nr_waiting[idx])) 27027ac50447STomasz Majchrzak schedule_timeout_uninterruptible(1); 27037ac50447STomasz Majchrzak 2704c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against 2705c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS 2706c40f341fSGoldwyn Rodrigues */ 2707c40f341fSGoldwyn Rodrigues 2708c40f341fSGoldwyn Rodrigues bitmap_cond_end_sync(mddev->bitmap, sector_nr, 2709c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); 27101c4588e9SNeilBrown r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 271117999be4SNeilBrown 2712c2fd4c94SNeilBrown raise_barrier(conf, sector_nr); 27131da177e4SLinus Torvalds 27143e198f78SNeilBrown rcu_read_lock(); 27153e198f78SNeilBrown /* 27163e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 27173e198f78SNeilBrown * we might want to read from a different device. So we 27183e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 27193e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 27203e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 27213e198f78SNeilBrown * is OK. 27223e198f78SNeilBrown */ 27231da177e4SLinus Torvalds 27241da177e4SLinus Torvalds r1_bio->mddev = mddev; 27251da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2726191ea9b2SNeilBrown r1_bio->state = 0; 27271da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 2728fd76863eScolyli@suse.de /* make sure good_sectors won't go across barrier unit boundary */ 2729fd76863eScolyli@suse.de good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); 27301da177e4SLinus Torvalds 27318f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 27323cb03002SNeilBrown struct md_rdev *rdev; 27331da177e4SLinus Torvalds bio = r1_bio->bios[i]; 27341da177e4SLinus Torvalds 27353e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 27363e198f78SNeilBrown if (rdev == NULL || 27373e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 27388f19ccb2SNeilBrown if (i < conf->raid_disks) 2739e3b9703eSNeilBrown still_degraded = 1; 27403e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 2741796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 27421da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 27431da177e4SLinus Torvalds write_targets ++; 27443e198f78SNeilBrown } else { 27453e198f78SNeilBrown /* may need to read from here */ 274606f60385SNeilBrown sector_t first_bad = MaxSector; 274706f60385SNeilBrown int bad_sectors; 274806f60385SNeilBrown 274906f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 275006f60385SNeilBrown &first_bad, &bad_sectors)) { 275106f60385SNeilBrown if (first_bad > sector_nr) 275206f60385SNeilBrown good_sectors = first_bad - sector_nr; 275306f60385SNeilBrown else { 275406f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 275506f60385SNeilBrown if (min_bad == 0 || 275606f60385SNeilBrown min_bad > bad_sectors) 275706f60385SNeilBrown min_bad = bad_sectors; 275806f60385SNeilBrown } 275906f60385SNeilBrown } 276006f60385SNeilBrown if (sector_nr < first_bad) { 27613e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 27623e198f78SNeilBrown if (wonly < 0) 27633e198f78SNeilBrown wonly = i; 27643e198f78SNeilBrown } else { 27653e198f78SNeilBrown if (disk < 0) 27663e198f78SNeilBrown disk = i; 27673e198f78SNeilBrown } 2768796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, 0); 276906f60385SNeilBrown bio->bi_end_io = end_sync_read; 27703e198f78SNeilBrown read_targets++; 2771d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) && 2772d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 2773d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 2774d57368afSAlexander Lyakas /* 2775d57368afSAlexander Lyakas * The device is suitable for reading (InSync), 2776d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them, 2777d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave 2778d57368afSAlexander Lyakas * this device alone for this sync request. 2779d57368afSAlexander Lyakas */ 2780796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 2781d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write; 2782d57368afSAlexander Lyakas write_targets++; 27833e198f78SNeilBrown } 278406f60385SNeilBrown } 278506f60385SNeilBrown if (bio->bi_end_io) { 27863e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 27874f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; 27883e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 27892e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) 27902e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 27911da177e4SLinus Torvalds } 279206f60385SNeilBrown } 27933e198f78SNeilBrown rcu_read_unlock(); 27943e198f78SNeilBrown if (disk < 0) 27953e198f78SNeilBrown disk = wonly; 27963e198f78SNeilBrown r1_bio->read_disk = disk; 2797191ea9b2SNeilBrown 279806f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 279906f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 280006f60385SNeilBrown * need to mark them bad on all write targets 280106f60385SNeilBrown */ 280206f60385SNeilBrown int ok = 1; 28038f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 280406f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2805a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 280606f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 280706f60385SNeilBrown min_bad, 0 280806f60385SNeilBrown ) && ok; 280906f60385SNeilBrown } 28102953079cSShaohua Li set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 281106f60385SNeilBrown *skipped = 1; 281206f60385SNeilBrown put_buf(r1_bio); 281306f60385SNeilBrown 281406f60385SNeilBrown if (!ok) { 281506f60385SNeilBrown /* Cannot record the badblocks, so need to 281606f60385SNeilBrown * abort the resync. 281706f60385SNeilBrown * If there are multiple read targets, could just 281806f60385SNeilBrown * fail the really bad ones ??? 281906f60385SNeilBrown */ 282006f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 282106f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 282206f60385SNeilBrown return 0; 282306f60385SNeilBrown } else 282406f60385SNeilBrown return min_bad; 282506f60385SNeilBrown 282606f60385SNeilBrown } 282706f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 282806f60385SNeilBrown /* only resync enough to reach the next bad->good 282906f60385SNeilBrown * transition */ 283006f60385SNeilBrown good_sectors = min_bad; 283106f60385SNeilBrown } 283206f60385SNeilBrown 28333e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 28343e198f78SNeilBrown /* extra read targets are also write targets */ 28353e198f78SNeilBrown write_targets += read_targets-1; 28363e198f78SNeilBrown 28373e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 28381da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 28391da177e4SLinus Torvalds * drives must be failed - so we are finished 28401da177e4SLinus Torvalds */ 2841b7219ccbSNeilBrown sector_t rv; 2842b7219ccbSNeilBrown if (min_bad > 0) 2843b7219ccbSNeilBrown max_sector = sector_nr + min_bad; 2844b7219ccbSNeilBrown rv = max_sector - sector_nr; 284557afd89fSNeilBrown *skipped = 1; 28461da177e4SLinus Torvalds put_buf(r1_bio); 28471da177e4SLinus Torvalds return rv; 28481da177e4SLinus Torvalds } 28491da177e4SLinus Torvalds 2850c6207277SNeilBrown if (max_sector > mddev->resync_max) 2851c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 285206f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 285306f60385SNeilBrown max_sector = sector_nr + good_sectors; 28541da177e4SLinus Torvalds nr_sectors = 0; 2855289e99e8SNeilBrown sync_blocks = 0; 28561da177e4SLinus Torvalds do { 28571da177e4SLinus Torvalds struct page *page; 28581da177e4SLinus Torvalds int len = PAGE_SIZE; 28591da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 28601da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 28611da177e4SLinus Torvalds if (len == 0) 28621da177e4SLinus Torvalds break; 2863ab7a30c7SNeilBrown if (sync_blocks == 0) { 28646a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 2865e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2866e5de485fSNeilBrown !conf->fullsync && 2867e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2868191ea9b2SNeilBrown break; 28697571ae88SNeilBrown if ((len >> 9) > sync_blocks) 28706a806c51SNeilBrown len = sync_blocks<<9; 2871ab7a30c7SNeilBrown } 2872191ea9b2SNeilBrown 28738f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 287498d30c58SMing Lei struct resync_pages *rp; 287598d30c58SMing Lei 28761da177e4SLinus Torvalds bio = r1_bio->bios[i]; 287798d30c58SMing Lei rp = get_resync_pages(bio); 28781da177e4SLinus Torvalds if (bio->bi_end_io) { 287998d30c58SMing Lei page = resync_fetch_page(rp, rp->idx++); 2880c85ba149SMing Lei 2881c85ba149SMing Lei /* 2882c85ba149SMing Lei * won't fail because the vec table is big 2883c85ba149SMing Lei * enough to hold all these pages 2884c85ba149SMing Lei */ 2885c85ba149SMing Lei bio_add_page(bio, page, len, 0); 28861da177e4SLinus Torvalds } 28871da177e4SLinus Torvalds } 28881da177e4SLinus Torvalds nr_sectors += len>>9; 28891da177e4SLinus Torvalds sector_nr += len>>9; 2890191ea9b2SNeilBrown sync_blocks -= (len>>9); 289198d30c58SMing Lei } while (get_resync_pages(r1_bio->bios[disk]->bi_private)->idx < RESYNC_PAGES); 289298d30c58SMing Lei 28931da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 28941da177e4SLinus Torvalds 2895c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) && 2896c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) { 2897c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed; 2898c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; 2899c40f341fSGoldwyn Rodrigues /* Send resync message */ 2900c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev, 2901c40f341fSGoldwyn Rodrigues conf->cluster_sync_low, 2902c40f341fSGoldwyn Rodrigues conf->cluster_sync_high); 2903c40f341fSGoldwyn Rodrigues } 2904c40f341fSGoldwyn Rodrigues 2905d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2906d11c171eSNeilBrown * compare 2907d11c171eSNeilBrown */ 2908d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2909d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 29102d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2911d11c171eSNeilBrown bio = r1_bio->bios[i]; 2912d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 29132d4f4f33SNeilBrown read_targets--; 2914ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 29152e52d449SNeilBrown if (read_targets == 1) 29162e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 29171da177e4SLinus Torvalds generic_make_request(bio); 2918d11c171eSNeilBrown } 2919d11c171eSNeilBrown } 2920d11c171eSNeilBrown } else { 2921d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2922d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2923ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 29242e52d449SNeilBrown if (read_targets == 1) 29252e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2926d11c171eSNeilBrown generic_make_request(bio); 2927d11c171eSNeilBrown 2928d11c171eSNeilBrown } 29291da177e4SLinus Torvalds return nr_sectors; 29301da177e4SLinus Torvalds } 29311da177e4SLinus Torvalds 2932fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 293380c3a6ceSDan Williams { 293480c3a6ceSDan Williams if (sectors) 293580c3a6ceSDan Williams return sectors; 293680c3a6ceSDan Williams 293780c3a6ceSDan Williams return mddev->dev_sectors; 293880c3a6ceSDan Williams } 293980c3a6ceSDan Williams 2940e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 29411da177e4SLinus Torvalds { 2942e8096360SNeilBrown struct r1conf *conf; 2943709ae487SNeilBrown int i; 29440eaf822cSJonathan Brassow struct raid1_info *disk; 29453cb03002SNeilBrown struct md_rdev *rdev; 2946709ae487SNeilBrown int err = -ENOMEM; 29471da177e4SLinus Torvalds 2948e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 29491da177e4SLinus Torvalds if (!conf) 2950709ae487SNeilBrown goto abort; 29511da177e4SLinus Torvalds 2952fd76863eScolyli@suse.de conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, 2953824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2954fd76863eScolyli@suse.de if (!conf->nr_pending) 2955fd76863eScolyli@suse.de goto abort; 2956fd76863eScolyli@suse.de 2957fd76863eScolyli@suse.de conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, 2958824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2959fd76863eScolyli@suse.de if (!conf->nr_waiting) 2960fd76863eScolyli@suse.de goto abort; 2961fd76863eScolyli@suse.de 2962fd76863eScolyli@suse.de conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, 2963824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2964fd76863eScolyli@suse.de if (!conf->nr_queued) 2965fd76863eScolyli@suse.de goto abort; 2966fd76863eScolyli@suse.de 2967fd76863eScolyli@suse.de conf->barrier = kcalloc(BARRIER_BUCKETS_NR, 2968824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2969fd76863eScolyli@suse.de if (!conf->barrier) 2970fd76863eScolyli@suse.de goto abort; 2971fd76863eScolyli@suse.de 29720eaf822cSJonathan Brassow conf->mirrors = kzalloc(sizeof(struct raid1_info) 29738f19ccb2SNeilBrown * mddev->raid_disks * 2, 29741da177e4SLinus Torvalds GFP_KERNEL); 29751da177e4SLinus Torvalds if (!conf->mirrors) 2976709ae487SNeilBrown goto abort; 29771da177e4SLinus Torvalds 2978ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2979ddaf22abSNeilBrown if (!conf->tmppage) 2980709ae487SNeilBrown goto abort; 2981ddaf22abSNeilBrown 2982709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 29831da177e4SLinus Torvalds if (!conf->poolinfo) 2984709ae487SNeilBrown goto abort; 29858f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 29861da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 29871da177e4SLinus Torvalds r1bio_pool_free, 29881da177e4SLinus Torvalds conf->poolinfo); 29891da177e4SLinus Torvalds if (!conf->r1bio_pool) 2990709ae487SNeilBrown goto abort; 2991709ae487SNeilBrown 2992c230e7e5SNeilBrown conf->bio_split = bioset_create(BIO_POOL_SIZE, 0); 2993c230e7e5SNeilBrown if (!conf->bio_split) 2994c230e7e5SNeilBrown goto abort; 2995c230e7e5SNeilBrown 2996ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 29971da177e4SLinus Torvalds 2998c19d5798SNeilBrown err = -EINVAL; 2999e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 3000dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 3001aba336bdSNeilBrown struct request_queue *q; 3002709ae487SNeilBrown int disk_idx = rdev->raid_disk; 30031da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 30041da177e4SLinus Torvalds || disk_idx < 0) 30051da177e4SLinus Torvalds continue; 3006c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 300702b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx; 3008c19d5798SNeilBrown else 30091da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 30101da177e4SLinus Torvalds 3011c19d5798SNeilBrown if (disk->rdev) 3012c19d5798SNeilBrown goto abort; 30131da177e4SLinus Torvalds disk->rdev = rdev; 3014aba336bdSNeilBrown q = bdev_get_queue(rdev->bdev); 30151da177e4SLinus Torvalds 30161da177e4SLinus Torvalds disk->head_position = 0; 301712cee5a8SShaohua Li disk->seq_start = MaxSector; 30181da177e4SLinus Torvalds } 30191da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 30201da177e4SLinus Torvalds conf->mddev = mddev; 30211da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 302255ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list); 30231da177e4SLinus Torvalds 30241da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 302517999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 30261da177e4SLinus Torvalds 3027191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 302834db0cd6SNeilBrown conf->pending_count = 0; 3029d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 3030191ea9b2SNeilBrown 3031c19d5798SNeilBrown err = -EIO; 30328f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 30331da177e4SLinus Torvalds 30341da177e4SLinus Torvalds disk = conf->mirrors + i; 30351da177e4SLinus Torvalds 3036c19d5798SNeilBrown if (i < conf->raid_disks && 3037c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 3038c19d5798SNeilBrown /* This slot has a replacement. */ 3039c19d5798SNeilBrown if (!disk->rdev) { 3040c19d5798SNeilBrown /* No original, just make the replacement 3041c19d5798SNeilBrown * a recovering spare 3042c19d5798SNeilBrown */ 3043c19d5798SNeilBrown disk->rdev = 3044c19d5798SNeilBrown disk[conf->raid_disks].rdev; 3045c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 3046c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 3047c19d5798SNeilBrown /* Original is not in_sync - bad */ 3048c19d5798SNeilBrown goto abort; 3049c19d5798SNeilBrown } 3050c19d5798SNeilBrown 30515fd6c1dcSNeilBrown if (!disk->rdev || 30525fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 30531da177e4SLinus Torvalds disk->head_position = 0; 30544f0a5e01SJonathan Brassow if (disk->rdev && 30554f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 305617571284SNeilBrown conf->fullsync = 1; 3057be4d3280SShaohua Li } 30581da177e4SLinus Torvalds } 3059709ae487SNeilBrown 3060709ae487SNeilBrown err = -ENOMEM; 30610232605dSNeilBrown conf->thread = md_register_thread(raid1d, mddev, "raid1"); 30621d41c216SNeilBrown if (!conf->thread) 3063709ae487SNeilBrown goto abort; 3064191ea9b2SNeilBrown 3065709ae487SNeilBrown return conf; 3066709ae487SNeilBrown 3067709ae487SNeilBrown abort: 3068709ae487SNeilBrown if (conf) { 3069709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 3070709ae487SNeilBrown kfree(conf->mirrors); 3071709ae487SNeilBrown safe_put_page(conf->tmppage); 3072709ae487SNeilBrown kfree(conf->poolinfo); 3073fd76863eScolyli@suse.de kfree(conf->nr_pending); 3074fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3075fd76863eScolyli@suse.de kfree(conf->nr_queued); 3076fd76863eScolyli@suse.de kfree(conf->barrier); 3077c230e7e5SNeilBrown if (conf->bio_split) 3078c230e7e5SNeilBrown bioset_free(conf->bio_split); 3079709ae487SNeilBrown kfree(conf); 3080709ae487SNeilBrown } 3081709ae487SNeilBrown return ERR_PTR(err); 3082709ae487SNeilBrown } 3083709ae487SNeilBrown 3084afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv); 3085849674e4SShaohua Li static int raid1_run(struct mddev *mddev) 3086709ae487SNeilBrown { 3087e8096360SNeilBrown struct r1conf *conf; 3088709ae487SNeilBrown int i; 30893cb03002SNeilBrown struct md_rdev *rdev; 30905220ea1eSmajianpeng int ret; 30912ff8cc2cSShaohua Li bool discard_supported = false; 3092709ae487SNeilBrown 3093709ae487SNeilBrown if (mddev->level != 1) { 30941d41c216SNeilBrown pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", 3095709ae487SNeilBrown mdname(mddev), mddev->level); 3096709ae487SNeilBrown return -EIO; 3097709ae487SNeilBrown } 3098709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 30991d41c216SNeilBrown pr_warn("md/raid1:%s: reshape_position set but not supported\n", 3100709ae487SNeilBrown mdname(mddev)); 3101709ae487SNeilBrown return -EIO; 3102709ae487SNeilBrown } 3103709ae487SNeilBrown /* 3104709ae487SNeilBrown * copy the already verified devices into our private RAID1 3105709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 3106afa0f557SNeilBrown * should be freed in raid1_free()] 3107709ae487SNeilBrown */ 3108709ae487SNeilBrown if (mddev->private == NULL) 3109709ae487SNeilBrown conf = setup_conf(mddev); 3110709ae487SNeilBrown else 3111709ae487SNeilBrown conf = mddev->private; 3112709ae487SNeilBrown 3113709ae487SNeilBrown if (IS_ERR(conf)) 3114709ae487SNeilBrown return PTR_ERR(conf); 3115709ae487SNeilBrown 3116c8dc9c65SJoe Lawrence if (mddev->queue) 31175026d7a9SH. Peter Anvin blk_queue_max_write_same_sectors(mddev->queue, 0); 31185026d7a9SH. Peter Anvin 3119dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 31201ed7242eSJonathan Brassow if (!mddev->gendisk) 31211ed7242eSJonathan Brassow continue; 3122709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 3123709ae487SNeilBrown rdev->data_offset << 9); 31242ff8cc2cSShaohua Li if (blk_queue_discard(bdev_get_queue(rdev->bdev))) 31252ff8cc2cSShaohua Li discard_supported = true; 3126709ae487SNeilBrown } 3127709ae487SNeilBrown 3128709ae487SNeilBrown mddev->degraded = 0; 3129709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 3130709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 3131709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 3132709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 3133709ae487SNeilBrown mddev->degraded++; 3134709ae487SNeilBrown 3135709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 3136709ae487SNeilBrown mddev->recovery_cp = MaxSector; 3137709ae487SNeilBrown 31388c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 31391d41c216SNeilBrown pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", 31408c6ac868SAndre Noll mdname(mddev)); 31411d41c216SNeilBrown pr_info("md/raid1:%s: active with %d out of %d mirrors\n", 31421da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 31431da177e4SLinus Torvalds mddev->raid_disks); 3144709ae487SNeilBrown 31451da177e4SLinus Torvalds /* 31461da177e4SLinus Torvalds * Ok, everything is just fine now 31471da177e4SLinus Torvalds */ 3148709ae487SNeilBrown mddev->thread = conf->thread; 3149709ae487SNeilBrown conf->thread = NULL; 3150709ae487SNeilBrown mddev->private = conf; 315146533ff7SNeilBrown set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); 3152709ae487SNeilBrown 31531f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 31541da177e4SLinus Torvalds 31551ed7242eSJonathan Brassow if (mddev->queue) { 31562ff8cc2cSShaohua Li if (discard_supported) 31572ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, 31582ff8cc2cSShaohua Li mddev->queue); 31592ff8cc2cSShaohua Li else 31602ff8cc2cSShaohua Li queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, 31612ff8cc2cSShaohua Li mddev->queue); 31621ed7242eSJonathan Brassow } 31635220ea1eSmajianpeng 31645220ea1eSmajianpeng ret = md_integrity_register(mddev); 31655aa61f42SNeilBrown if (ret) { 31665aa61f42SNeilBrown md_unregister_thread(&mddev->thread); 3167afa0f557SNeilBrown raid1_free(mddev, conf); 31685aa61f42SNeilBrown } 31695220ea1eSmajianpeng return ret; 31701da177e4SLinus Torvalds } 31711da177e4SLinus Torvalds 3172afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv) 31731da177e4SLinus Torvalds { 3174afa0f557SNeilBrown struct r1conf *conf = priv; 31754b6d287fSNeilBrown 31761da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 31771da177e4SLinus Torvalds kfree(conf->mirrors); 31780fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage); 31791da177e4SLinus Torvalds kfree(conf->poolinfo); 3180fd76863eScolyli@suse.de kfree(conf->nr_pending); 3181fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3182fd76863eScolyli@suse.de kfree(conf->nr_queued); 3183fd76863eScolyli@suse.de kfree(conf->barrier); 3184c230e7e5SNeilBrown if (conf->bio_split) 3185c230e7e5SNeilBrown bioset_free(conf->bio_split); 31861da177e4SLinus Torvalds kfree(conf); 31871da177e4SLinus Torvalds } 31881da177e4SLinus Torvalds 3189fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 31901da177e4SLinus Torvalds { 31911da177e4SLinus Torvalds /* no resync is happening, and there is enough space 31921da177e4SLinus Torvalds * on all devices, so we can resize. 31931da177e4SLinus Torvalds * We need to make sure resync covers any new space. 31941da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 31951da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 31961da177e4SLinus Torvalds * worth it. 31971da177e4SLinus Torvalds */ 3198a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 3199a4a6125aSNeilBrown if (mddev->external_size && 3200a4a6125aSNeilBrown mddev->array_sectors > newsize) 3201b522adcdSDan Williams return -EINVAL; 3202a4a6125aSNeilBrown if (mddev->bitmap) { 3203a4a6125aSNeilBrown int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); 3204a4a6125aSNeilBrown if (ret) 3205a4a6125aSNeilBrown return ret; 3206a4a6125aSNeilBrown } 3207a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 3208b522adcdSDan Williams if (sectors > mddev->dev_sectors && 3209b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 321058c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 32111da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 32121da177e4SLinus Torvalds } 3213b522adcdSDan Williams mddev->dev_sectors = sectors; 32144b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 32151da177e4SLinus Torvalds return 0; 32161da177e4SLinus Torvalds } 32171da177e4SLinus Torvalds 3218fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 32191da177e4SLinus Torvalds { 32201da177e4SLinus Torvalds /* We need to: 32211da177e4SLinus Torvalds * 1/ resize the r1bio_pool 32221da177e4SLinus Torvalds * 2/ resize conf->mirrors 32231da177e4SLinus Torvalds * 32241da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 32251da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 32261da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 32276ea9c07cSNeilBrown * 32286ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 32296ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 32301da177e4SLinus Torvalds */ 32311da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 32321da177e4SLinus Torvalds struct pool_info *newpoolinfo; 32330eaf822cSJonathan Brassow struct raid1_info *newmirrors; 3234e8096360SNeilBrown struct r1conf *conf = mddev->private; 323563c70c4fSNeilBrown int cnt, raid_disks; 3236c04be0aaSNeilBrown unsigned long flags; 3237b5470dc5SDan Williams int d, d2, err; 32381da177e4SLinus Torvalds 323963c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 3240664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 324163c70c4fSNeilBrown mddev->layout != mddev->new_layout || 324263c70c4fSNeilBrown mddev->level != mddev->new_level) { 3243664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 324463c70c4fSNeilBrown mddev->new_layout = mddev->layout; 324563c70c4fSNeilBrown mddev->new_level = mddev->level; 324663c70c4fSNeilBrown return -EINVAL; 324763c70c4fSNeilBrown } 324863c70c4fSNeilBrown 324928c1b9fdSGoldwyn Rodrigues if (!mddev_is_clustered(mddev)) { 3250b5470dc5SDan Williams err = md_allow_write(mddev); 3251b5470dc5SDan Williams if (err) 3252b5470dc5SDan Williams return err; 325328c1b9fdSGoldwyn Rodrigues } 32542a2275d6SNeilBrown 325563c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 325663c70c4fSNeilBrown 32576ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 32586ea9c07cSNeilBrown cnt=0; 32596ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 32601da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 32616ea9c07cSNeilBrown cnt++; 32626ea9c07cSNeilBrown if (cnt > raid_disks) 32631da177e4SLinus Torvalds return -EBUSY; 32646ea9c07cSNeilBrown } 32651da177e4SLinus Torvalds 32661da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 32671da177e4SLinus Torvalds if (!newpoolinfo) 32681da177e4SLinus Torvalds return -ENOMEM; 32691da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 32708f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 32711da177e4SLinus Torvalds 32721da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 32731da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 32741da177e4SLinus Torvalds if (!newpool) { 32751da177e4SLinus Torvalds kfree(newpoolinfo); 32761da177e4SLinus Torvalds return -ENOMEM; 32771da177e4SLinus Torvalds } 32780eaf822cSJonathan Brassow newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, 32798f19ccb2SNeilBrown GFP_KERNEL); 32801da177e4SLinus Torvalds if (!newmirrors) { 32811da177e4SLinus Torvalds kfree(newpoolinfo); 32821da177e4SLinus Torvalds mempool_destroy(newpool); 32831da177e4SLinus Torvalds return -ENOMEM; 32841da177e4SLinus Torvalds } 32851da177e4SLinus Torvalds 3286e2d59925SNeilBrown freeze_array(conf, 0); 32871da177e4SLinus Torvalds 32881da177e4SLinus Torvalds /* ok, everything is stopped */ 32891da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 32901da177e4SLinus Torvalds conf->r1bio_pool = newpool; 32916ea9c07cSNeilBrown 3292a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 32933cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 3294a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 329536fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 3296a88aa786SNeilBrown rdev->raid_disk = d2; 329736fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 329836fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 32991d41c216SNeilBrown pr_warn("md/raid1:%s: cannot register rd%d\n", 330036fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 3301a88aa786SNeilBrown } 3302a88aa786SNeilBrown if (rdev) 3303a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 33046ea9c07cSNeilBrown } 33051da177e4SLinus Torvalds kfree(conf->mirrors); 33061da177e4SLinus Torvalds conf->mirrors = newmirrors; 33071da177e4SLinus Torvalds kfree(conf->poolinfo); 33081da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 33091da177e4SLinus Torvalds 3310c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 33111da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 3312c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 33131da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 331463c70c4fSNeilBrown mddev->delta_disks = 0; 33151da177e4SLinus Torvalds 3316e2d59925SNeilBrown unfreeze_array(conf); 33171da177e4SLinus Torvalds 3318985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 33191da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 33201da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 33211da177e4SLinus Torvalds 33221da177e4SLinus Torvalds mempool_destroy(oldpool); 33231da177e4SLinus Torvalds return 0; 33241da177e4SLinus Torvalds } 33251da177e4SLinus Torvalds 3326fd01b88cSNeilBrown static void raid1_quiesce(struct mddev *mddev, int state) 332736fa3063SNeilBrown { 3328e8096360SNeilBrown struct r1conf *conf = mddev->private; 332936fa3063SNeilBrown 333036fa3063SNeilBrown switch(state) { 33316eef4b21SNeilBrown case 2: /* wake for suspend */ 33326eef4b21SNeilBrown wake_up(&conf->wait_barrier); 33336eef4b21SNeilBrown break; 33349e6603daSNeilBrown case 1: 333507169fd4Smajianpeng freeze_array(conf, 0); 333636fa3063SNeilBrown break; 33379e6603daSNeilBrown case 0: 333807169fd4Smajianpeng unfreeze_array(conf); 333936fa3063SNeilBrown break; 334036fa3063SNeilBrown } 334136fa3063SNeilBrown } 334236fa3063SNeilBrown 3343fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 3344709ae487SNeilBrown { 3345709ae487SNeilBrown /* raid1 can take over: 3346709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 3347709ae487SNeilBrown */ 3348709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 3349e8096360SNeilBrown struct r1conf *conf; 3350709ae487SNeilBrown mddev->new_level = 1; 3351709ae487SNeilBrown mddev->new_layout = 0; 3352709ae487SNeilBrown mddev->new_chunk_sectors = 0; 3353709ae487SNeilBrown conf = setup_conf(mddev); 33546995f0b2SShaohua Li if (!IS_ERR(conf)) { 335507169fd4Smajianpeng /* Array must appear to be quiesced */ 335607169fd4Smajianpeng conf->array_frozen = 1; 3357394ed8e4SShaohua Li mddev_clear_unsupported_flags(mddev, 3358394ed8e4SShaohua Li UNSUPPORTED_MDDEV_FLAGS); 33596995f0b2SShaohua Li } 3360709ae487SNeilBrown return conf; 3361709ae487SNeilBrown } 3362709ae487SNeilBrown return ERR_PTR(-EINVAL); 3363709ae487SNeilBrown } 33641da177e4SLinus Torvalds 336584fc4b56SNeilBrown static struct md_personality raid1_personality = 33661da177e4SLinus Torvalds { 33671da177e4SLinus Torvalds .name = "raid1", 33682604b703SNeilBrown .level = 1, 33691da177e4SLinus Torvalds .owner = THIS_MODULE, 3370849674e4SShaohua Li .make_request = raid1_make_request, 3371849674e4SShaohua Li .run = raid1_run, 3372afa0f557SNeilBrown .free = raid1_free, 3373849674e4SShaohua Li .status = raid1_status, 3374849674e4SShaohua Li .error_handler = raid1_error, 33751da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 33761da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 33771da177e4SLinus Torvalds .spare_active = raid1_spare_active, 3378849674e4SShaohua Li .sync_request = raid1_sync_request, 33791da177e4SLinus Torvalds .resize = raid1_resize, 338080c3a6ceSDan Williams .size = raid1_size, 338163c70c4fSNeilBrown .check_reshape = raid1_reshape, 338236fa3063SNeilBrown .quiesce = raid1_quiesce, 3383709ae487SNeilBrown .takeover = raid1_takeover, 33845c675f83SNeilBrown .congested = raid1_congested, 33851da177e4SLinus Torvalds }; 33861da177e4SLinus Torvalds 33871da177e4SLinus Torvalds static int __init raid_init(void) 33881da177e4SLinus Torvalds { 33892604b703SNeilBrown return register_md_personality(&raid1_personality); 33901da177e4SLinus Torvalds } 33911da177e4SLinus Torvalds 33921da177e4SLinus Torvalds static void raid_exit(void) 33931da177e4SLinus Torvalds { 33942604b703SNeilBrown unregister_md_personality(&raid1_personality); 33951da177e4SLinus Torvalds } 33961da177e4SLinus Torvalds 33971da177e4SLinus Torvalds module_init(raid_init); 33981da177e4SLinus Torvalds module_exit(raid_exit); 33991da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 34000efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 34011da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3402d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 34032604b703SNeilBrown MODULE_ALIAS("md-level-1"); 340434db0cd6SNeilBrown 340534db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 3406