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 84fb0eb5dfSMing Lei #include "raid1-10.c" 85fb0eb5dfSMing Lei 8698d30c58SMing Lei /* 8798d30c58SMing Lei * for resync bio, r1bio pointer can be retrieved from the per-bio 8898d30c58SMing Lei * 'struct resync_pages'. 8998d30c58SMing Lei */ 9098d30c58SMing Lei static inline struct r1bio *get_resync_r1bio(struct bio *bio) 9198d30c58SMing Lei { 9298d30c58SMing Lei return get_resync_pages(bio)->raid_bio; 9398d30c58SMing Lei } 9498d30c58SMing Lei 95dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 961da177e4SLinus Torvalds { 971da177e4SLinus Torvalds struct pool_info *pi = data; 989f2c9d12SNeilBrown int size = offsetof(struct r1bio, bios[pi->raid_disks]); 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 1017eaceaccSJens Axboe return kzalloc(size, gfp_flags); 1021da177e4SLinus Torvalds } 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 1051da177e4SLinus Torvalds { 1061da177e4SLinus Torvalds kfree(r1_bio); 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1098e005f7cSmajianpeng #define RESYNC_DEPTH 32 1101da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 1118e005f7cSmajianpeng #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) 1128e005f7cSmajianpeng #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) 113c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) 114c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) 1151da177e4SLinus Torvalds 116dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 1171da177e4SLinus Torvalds { 1181da177e4SLinus Torvalds struct pool_info *pi = data; 1199f2c9d12SNeilBrown struct r1bio *r1_bio; 1201da177e4SLinus Torvalds struct bio *bio; 121da1aab3dSNeilBrown int need_pages; 12298d30c58SMing Lei int j; 12398d30c58SMing Lei struct resync_pages *rps; 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 1267eaceaccSJens Axboe if (!r1_bio) 1271da177e4SLinus Torvalds return NULL; 1281da177e4SLinus Torvalds 12998d30c58SMing Lei rps = kmalloc(sizeof(struct resync_pages) * pi->raid_disks, 13098d30c58SMing Lei gfp_flags); 13198d30c58SMing Lei if (!rps) 13298d30c58SMing Lei goto out_free_r1bio; 13398d30c58SMing Lei 1341da177e4SLinus Torvalds /* 1351da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 1361da177e4SLinus Torvalds */ 1371da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 1386746557fSNeilBrown bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); 1391da177e4SLinus Torvalds if (!bio) 1401da177e4SLinus Torvalds goto out_free_bio; 1411da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds /* 1441da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 145d11c171eSNeilBrown * the first bio. 146d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 147d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1481da177e4SLinus Torvalds */ 149d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 150da1aab3dSNeilBrown need_pages = pi->raid_disks; 151d11c171eSNeilBrown else 152da1aab3dSNeilBrown need_pages = 1; 15398d30c58SMing Lei for (j = 0; j < pi->raid_disks; j++) { 15498d30c58SMing Lei struct resync_pages *rp = &rps[j]; 1551da177e4SLinus Torvalds 15698d30c58SMing Lei bio = r1_bio->bios[j]; 15798d30c58SMing Lei 15898d30c58SMing Lei if (j < need_pages) { 15998d30c58SMing Lei if (resync_alloc_pages(rp, gfp_flags)) 160da1aab3dSNeilBrown goto out_free_pages; 16198d30c58SMing Lei } else { 16298d30c58SMing Lei memcpy(rp, &rps[0], sizeof(*rp)); 16398d30c58SMing Lei resync_get_all_pages(rp); 164d11c171eSNeilBrown } 16598d30c58SMing Lei 16698d30c58SMing Lei rp->raid_bio = r1_bio; 16798d30c58SMing Lei bio->bi_private = rp; 168d11c171eSNeilBrown } 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1711da177e4SLinus Torvalds 1721da177e4SLinus Torvalds return r1_bio; 1731da177e4SLinus Torvalds 174da1aab3dSNeilBrown out_free_pages: 175491221f8SGuoqing Jiang while (--j >= 0) 17698d30c58SMing Lei resync_free_pages(&rps[j]); 177da1aab3dSNeilBrown 1781da177e4SLinus Torvalds out_free_bio: 1791da177e4SLinus Torvalds while (++j < pi->raid_disks) 1801da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 18198d30c58SMing Lei kfree(rps); 18298d30c58SMing Lei 18398d30c58SMing Lei out_free_r1bio: 1841da177e4SLinus Torvalds r1bio_pool_free(r1_bio, data); 1851da177e4SLinus Torvalds return NULL; 1861da177e4SLinus Torvalds } 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 1891da177e4SLinus Torvalds { 1901da177e4SLinus Torvalds struct pool_info *pi = data; 19198d30c58SMing Lei int i; 1929f2c9d12SNeilBrown struct r1bio *r1bio = __r1_bio; 19398d30c58SMing Lei struct resync_pages *rp = NULL; 1941da177e4SLinus Torvalds 19598d30c58SMing Lei for (i = pi->raid_disks; i--; ) { 19698d30c58SMing Lei rp = get_resync_pages(r1bio->bios[i]); 19798d30c58SMing Lei resync_free_pages(rp); 1981da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 19998d30c58SMing Lei } 20098d30c58SMing Lei 20198d30c58SMing Lei /* resync pages array stored in the 1st bio's .bi_private */ 20298d30c58SMing Lei kfree(rp); 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds r1bio_pool_free(r1bio, data); 2051da177e4SLinus Torvalds } 2061da177e4SLinus Torvalds 207e8096360SNeilBrown static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) 2081da177e4SLinus Torvalds { 2091da177e4SLinus Torvalds int i; 2101da177e4SLinus Torvalds 2118f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2121da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 2134367af55SNeilBrown if (!BIO_SPECIAL(*bio)) 2141da177e4SLinus Torvalds bio_put(*bio); 2151da177e4SLinus Torvalds *bio = NULL; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds 2199f2c9d12SNeilBrown static void free_r1bio(struct r1bio *r1_bio) 2201da177e4SLinus Torvalds { 221e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 2241da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1bio_pool); 2251da177e4SLinus Torvalds } 2261da177e4SLinus Torvalds 2279f2c9d12SNeilBrown static void put_buf(struct r1bio *r1_bio) 2281da177e4SLinus Torvalds { 229e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 230af5f42a7SShaohua Li sector_t sect = r1_bio->sector; 2313e198f78SNeilBrown int i; 2323e198f78SNeilBrown 2338f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2343e198f78SNeilBrown struct bio *bio = r1_bio->bios[i]; 2353e198f78SNeilBrown if (bio->bi_end_io) 2363e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); 2373e198f78SNeilBrown } 2381da177e4SLinus Torvalds 2391da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1buf_pool); 2401da177e4SLinus Torvalds 241af5f42a7SShaohua Li lower_barrier(conf, sect); 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds 2449f2c9d12SNeilBrown static void reschedule_retry(struct r1bio *r1_bio) 2451da177e4SLinus Torvalds { 2461da177e4SLinus Torvalds unsigned long flags; 247fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 248e8096360SNeilBrown struct r1conf *conf = mddev->private; 249fd76863eScolyli@suse.de int idx; 2501da177e4SLinus Torvalds 251fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2521da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2531da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 254824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 2551da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 2561da177e4SLinus Torvalds 25717999be4SNeilBrown wake_up(&conf->wait_barrier); 2581da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds /* 2621da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored 2631da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer 2641da177e4SLinus Torvalds * cache layer. 2651da177e4SLinus Torvalds */ 2669f2c9d12SNeilBrown static void call_bio_endio(struct r1bio *r1_bio) 267d2eb35acSNeilBrown { 268d2eb35acSNeilBrown struct bio *bio = r1_bio->master_bio; 269e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 270d2eb35acSNeilBrown 271d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2724e4cbee9SChristoph Hellwig bio->bi_status = BLK_STS_IOERR; 2734246a0b6SChristoph Hellwig 2744246a0b6SChristoph Hellwig bio_endio(bio); 275d2eb35acSNeilBrown /* 276d2eb35acSNeilBrown * Wake up any possible resync thread that waits for the device 277d2eb35acSNeilBrown * to go idle. 278d2eb35acSNeilBrown */ 27937011e3aSNeilBrown allow_barrier(conf, r1_bio->sector); 280d2eb35acSNeilBrown } 281d2eb35acSNeilBrown 2829f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 2831da177e4SLinus Torvalds { 2841da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 2851da177e4SLinus Torvalds 2864b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 2874b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 28836a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 2894b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 2904f024f37SKent Overstreet (unsigned long long) bio->bi_iter.bi_sector, 2914f024f37SKent Overstreet (unsigned long long) bio_end_sector(bio) - 1); 2924b6d287fSNeilBrown 293d2eb35acSNeilBrown call_bio_endio(r1_bio); 2944b6d287fSNeilBrown } 2951da177e4SLinus Torvalds free_r1bio(r1_bio); 2961da177e4SLinus Torvalds } 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds /* 2991da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 3001da177e4SLinus Torvalds */ 3019f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 3021da177e4SLinus Torvalds { 303e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds conf->mirrors[disk].head_position = 3061da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds 309ba3ae3beSNamhyung Kim /* 310ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 311ba3ae3beSNamhyung Kim */ 3129f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 313ba3ae3beSNamhyung Kim { 314ba3ae3beSNamhyung Kim int mirror; 31530194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 31630194636SNeilBrown int raid_disks = conf->raid_disks; 317ba3ae3beSNamhyung Kim 3188f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 319ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 320ba3ae3beSNamhyung Kim break; 321ba3ae3beSNamhyung Kim 3228f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 323ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 324ba3ae3beSNamhyung Kim 325ba3ae3beSNamhyung Kim return mirror; 326ba3ae3beSNamhyung Kim } 327ba3ae3beSNamhyung Kim 3284246a0b6SChristoph Hellwig static void raid1_end_read_request(struct bio *bio) 3291da177e4SLinus Torvalds { 3304e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status; 3319f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 332e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 333e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds /* 3361da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3371da177e4SLinus Torvalds */ 338e5872d58SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 339ddaf22abSNeilBrown 340220946c9SNeilBrown if (uptodate) 3411da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3422e52d449SNeilBrown else if (test_bit(FailFast, &rdev->flags) && 3432e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 3442e52d449SNeilBrown /* This was a fail-fast read so we definitely 3452e52d449SNeilBrown * want to retry */ 3462e52d449SNeilBrown ; 347dd00a99eSNeilBrown else { 348dd00a99eSNeilBrown /* If all other devices have failed, we want to return 349dd00a99eSNeilBrown * the error upwards rather than fail the last device. 350dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 351dd00a99eSNeilBrown */ 352dd00a99eSNeilBrown unsigned long flags; 353dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 354dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 355dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 356e5872d58SNeilBrown test_bit(In_sync, &rdev->flags))) 357dd00a99eSNeilBrown uptodate = 1; 358dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 359dd00a99eSNeilBrown } 3601da177e4SLinus Torvalds 3617ad4d4a6SNeilBrown if (uptodate) { 3621da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 363e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 3647ad4d4a6SNeilBrown } else { 3651da177e4SLinus Torvalds /* 3661da177e4SLinus Torvalds * oops, read error: 3671da177e4SLinus Torvalds */ 3681da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 3691d41c216SNeilBrown pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", 3709dd1e2faSNeilBrown mdname(conf->mddev), 3711d41c216SNeilBrown bdevname(rdev->bdev, b), 3728bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 373d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 3741da177e4SLinus Torvalds reschedule_retry(r1_bio); 3757ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */ 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds } 3781da177e4SLinus Torvalds 3799f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 3804e78064fSNeilBrown { 3814e78064fSNeilBrown /* it really is the end of this request */ 3824e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 383841c1316SMing Lei bio_free_pages(r1_bio->behind_master_bio); 384841c1316SMing Lei bio_put(r1_bio->behind_master_bio); 385841c1316SMing Lei r1_bio->behind_master_bio = NULL; 3864e78064fSNeilBrown } 3874e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 3884e78064fSNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 3894e78064fSNeilBrown r1_bio->sectors, 3904e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 391af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 3924e78064fSNeilBrown md_write_end(r1_bio->mddev); 393cd5ff9a1SNeilBrown } 394cd5ff9a1SNeilBrown 3959f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 396cd5ff9a1SNeilBrown { 397cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 398cd5ff9a1SNeilBrown return; 399cd5ff9a1SNeilBrown 400cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 401cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 402cd5ff9a1SNeilBrown else { 403cd5ff9a1SNeilBrown close_write(r1_bio); 4044367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 4054367af55SNeilBrown reschedule_retry(r1_bio); 4064367af55SNeilBrown else 4074e78064fSNeilBrown raid_end_bio_io(r1_bio); 4084e78064fSNeilBrown } 4094e78064fSNeilBrown } 4104e78064fSNeilBrown 4114246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio) 4121da177e4SLinus Torvalds { 4139f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 414e5872d58SNeilBrown int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 415e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 41604b857f7SNeilBrown struct bio *to_put = NULL; 417e5872d58SNeilBrown int mirror = find_bio_disk(r1_bio, bio); 418e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[mirror].rdev; 419e3f948cdSShaohua Li bool discard_error; 420e3f948cdSShaohua Li 4214e4cbee9SChristoph Hellwig discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; 4221da177e4SLinus Torvalds 4231da177e4SLinus Torvalds /* 424e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4251da177e4SLinus Torvalds */ 4264e4cbee9SChristoph Hellwig if (bio->bi_status && !discard_error) { 427e5872d58SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 428e5872d58SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 42919d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 43019d67169SNeilBrown conf->mddev->recovery); 43119d67169SNeilBrown 432212e7eb7SNeilBrown if (test_bit(FailFast, &rdev->flags) && 433212e7eb7SNeilBrown (bio->bi_opf & MD_FAILFAST) && 434212e7eb7SNeilBrown /* We never try FailFast to WriteMostly devices */ 435212e7eb7SNeilBrown !test_bit(WriteMostly, &rdev->flags)) { 436212e7eb7SNeilBrown md_error(r1_bio->mddev, rdev); 437212e7eb7SNeilBrown if (!test_bit(Faulty, &rdev->flags)) 438212e7eb7SNeilBrown /* This is the only remaining device, 439212e7eb7SNeilBrown * We need to retry the write without 440212e7eb7SNeilBrown * FailFast 441212e7eb7SNeilBrown */ 442212e7eb7SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 443212e7eb7SNeilBrown else { 444212e7eb7SNeilBrown /* Finished with this branch */ 445212e7eb7SNeilBrown r1_bio->bios[mirror] = NULL; 446212e7eb7SNeilBrown to_put = bio; 447212e7eb7SNeilBrown } 448212e7eb7SNeilBrown } else 449cd5ff9a1SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 4504367af55SNeilBrown } else { 4511da177e4SLinus Torvalds /* 452e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 453e9c7469bSTejun Heo * will return a good error code for to the higher 454e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 455e9c7469bSTejun Heo * fails. 4561da177e4SLinus Torvalds * 457e9c7469bSTejun Heo * The 'master' represents the composite IO operation 458e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 459e9c7469bSTejun Heo * will wait for the 'master' bio. 4601da177e4SLinus Torvalds */ 4614367af55SNeilBrown sector_t first_bad; 4624367af55SNeilBrown int bad_sectors; 4634367af55SNeilBrown 464cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 465cd5ff9a1SNeilBrown to_put = bio; 4663056e3aeSAlex Lyakas /* 4673056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is 4683056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use 4693056e3aeSAlex Lyakas * such device for properly reading the data back (we could 4703056e3aeSAlex Lyakas * potentially use it, if the current write would have felt 4713056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't 4723056e3aeSAlex Lyakas * check this here. 4733056e3aeSAlex Lyakas */ 474e5872d58SNeilBrown if (test_bit(In_sync, &rdev->flags) && 475e5872d58SNeilBrown !test_bit(Faulty, &rdev->flags)) 4761da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 4771da177e4SLinus Torvalds 4784367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 479e5872d58SNeilBrown if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 480e3f948cdSShaohua Li &first_bad, &bad_sectors) && !discard_error) { 4814367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 4824367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 4834367af55SNeilBrown } 4844367af55SNeilBrown } 4854367af55SNeilBrown 4864b6d287fSNeilBrown if (behind) { 487e5872d58SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) 4884b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 4894b6d287fSNeilBrown 490e9c7469bSTejun Heo /* 491e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 492e9c7469bSTejun Heo * has safely reached all non-writemostly 493e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 494e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 495e9c7469bSTejun Heo * -EIO here, instead we'll wait 496e9c7469bSTejun Heo */ 4974b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 4984b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 4994b6d287fSNeilBrown /* Maybe we can return now */ 5004b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 5014b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 50236a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 50336a4e1feSNeilBrown " %llu-%llu\n", 5044f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector, 5054f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1); 506d2eb35acSNeilBrown call_bio_endio(r1_bio); 5074b6d287fSNeilBrown } 5084b6d287fSNeilBrown } 5094b6d287fSNeilBrown } 5104367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 511e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 512e9c7469bSTejun Heo 5131da177e4SLinus Torvalds /* 5141da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 5151da177e4SLinus Torvalds * already. 5161da177e4SLinus Torvalds */ 517af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 518c70810b3SNeilBrown 51904b857f7SNeilBrown if (to_put) 52004b857f7SNeilBrown bio_put(to_put); 5211da177e4SLinus Torvalds } 5221da177e4SLinus Torvalds 523fd76863eScolyli@suse.de static sector_t align_to_barrier_unit_end(sector_t start_sector, 524fd76863eScolyli@suse.de sector_t sectors) 525fd76863eScolyli@suse.de { 526fd76863eScolyli@suse.de sector_t len; 527fd76863eScolyli@suse.de 528fd76863eScolyli@suse.de WARN_ON(sectors == 0); 529fd76863eScolyli@suse.de /* 530fd76863eScolyli@suse.de * len is the number of sectors from start_sector to end of the 531fd76863eScolyli@suse.de * barrier unit which start_sector belongs to. 532fd76863eScolyli@suse.de */ 533fd76863eScolyli@suse.de len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - 534fd76863eScolyli@suse.de start_sector; 535fd76863eScolyli@suse.de 536fd76863eScolyli@suse.de if (len > sectors) 537fd76863eScolyli@suse.de len = sectors; 538fd76863eScolyli@suse.de 539fd76863eScolyli@suse.de return len; 540fd76863eScolyli@suse.de } 541fd76863eScolyli@suse.de 5421da177e4SLinus Torvalds /* 5431da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 5441da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 5451da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 5461da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 5471da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 5481da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 5491da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 5501da177e4SLinus Torvalds * 5511da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 5521da177e4SLinus Torvalds * because position is mirror, not device based. 5531da177e4SLinus Torvalds * 5541da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 5551da177e4SLinus Torvalds */ 556e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 5571da177e4SLinus Torvalds { 558af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 559d2eb35acSNeilBrown int sectors; 560d2eb35acSNeilBrown int best_good_sectors; 5619dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 5629dedf603SShaohua Li int has_nonrot_disk; 563be4d3280SShaohua Li int disk; 56476073054SNeilBrown sector_t best_dist; 5659dedf603SShaohua Li unsigned int min_pending; 5663cb03002SNeilBrown struct md_rdev *rdev; 567f3ac8bf7SNeilBrown int choose_first; 56812cee5a8SShaohua Li int choose_next_idle; 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds rcu_read_lock(); 5711da177e4SLinus Torvalds /* 5728ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 5731da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 5741da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 5751da177e4SLinus Torvalds */ 5761da177e4SLinus Torvalds retry: 577d2eb35acSNeilBrown sectors = r1_bio->sectors; 57876073054SNeilBrown best_disk = -1; 5799dedf603SShaohua Li best_dist_disk = -1; 58076073054SNeilBrown best_dist = MaxSector; 5819dedf603SShaohua Li best_pending_disk = -1; 5829dedf603SShaohua Li min_pending = UINT_MAX; 583d2eb35acSNeilBrown best_good_sectors = 0; 5849dedf603SShaohua Li has_nonrot_disk = 0; 58512cee5a8SShaohua Li choose_next_idle = 0; 5862e52d449SNeilBrown clear_bit(R1BIO_FailFast, &r1_bio->state); 587d2eb35acSNeilBrown 5887d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) || 5897d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) && 59090382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, 5917d49ffcfSGoldwyn Rodrigues this_sector + sectors))) 5927d49ffcfSGoldwyn Rodrigues choose_first = 1; 5937d49ffcfSGoldwyn Rodrigues else 5947d49ffcfSGoldwyn Rodrigues choose_first = 0; 5951da177e4SLinus Torvalds 596be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 59776073054SNeilBrown sector_t dist; 598d2eb35acSNeilBrown sector_t first_bad; 599d2eb35acSNeilBrown int bad_sectors; 6009dedf603SShaohua Li unsigned int pending; 60112cee5a8SShaohua Li bool nonrot; 602d2eb35acSNeilBrown 603f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 604f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 605f3ac8bf7SNeilBrown || rdev == NULL 60676073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 607f3ac8bf7SNeilBrown continue; 60876073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 60976073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 61076073054SNeilBrown continue; 61176073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 61276073054SNeilBrown /* Don't balance among write-mostly, just 61376073054SNeilBrown * use the first as a last resort */ 614d1901ef0STomáš Hodek if (best_dist_disk < 0) { 615307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 616307729c8SNeilBrown &first_bad, &bad_sectors)) { 617816b0acfSWei Fang if (first_bad <= this_sector) 618307729c8SNeilBrown /* Cannot use this */ 619307729c8SNeilBrown continue; 620307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 621307729c8SNeilBrown } else 622307729c8SNeilBrown best_good_sectors = sectors; 623d1901ef0STomáš Hodek best_dist_disk = disk; 624d1901ef0STomáš Hodek best_pending_disk = disk; 625307729c8SNeilBrown } 62676073054SNeilBrown continue; 6278ddf9efeSNeilBrown } 62876073054SNeilBrown /* This is a reasonable device to use. It might 62976073054SNeilBrown * even be best. 6301da177e4SLinus Torvalds */ 631d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 632d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 633d2eb35acSNeilBrown if (best_dist < MaxSector) 634d2eb35acSNeilBrown /* already have a better device */ 635d2eb35acSNeilBrown continue; 636d2eb35acSNeilBrown if (first_bad <= this_sector) { 637d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 638d2eb35acSNeilBrown * device, then we must not read beyond 639d2eb35acSNeilBrown * bad_sectors from another device.. 640d2eb35acSNeilBrown */ 641d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 642d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 643d2eb35acSNeilBrown sectors = bad_sectors; 644d2eb35acSNeilBrown if (best_good_sectors > sectors) 645d2eb35acSNeilBrown best_good_sectors = sectors; 646d2eb35acSNeilBrown 647d2eb35acSNeilBrown } else { 648d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 649d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 650d2eb35acSNeilBrown best_good_sectors = good_sectors; 651d2eb35acSNeilBrown best_disk = disk; 652d2eb35acSNeilBrown } 653d2eb35acSNeilBrown if (choose_first) 654d2eb35acSNeilBrown break; 655d2eb35acSNeilBrown } 656d2eb35acSNeilBrown continue; 657d82dd0e3STomasz Majchrzak } else { 658d82dd0e3STomasz Majchrzak if ((sectors > best_good_sectors) && (best_disk >= 0)) 659d82dd0e3STomasz Majchrzak best_disk = -1; 660d2eb35acSNeilBrown best_good_sectors = sectors; 661d82dd0e3STomasz Majchrzak } 662d2eb35acSNeilBrown 6632e52d449SNeilBrown if (best_disk >= 0) 6642e52d449SNeilBrown /* At least two disks to choose from so failfast is OK */ 6652e52d449SNeilBrown set_bit(R1BIO_FailFast, &r1_bio->state); 6662e52d449SNeilBrown 66712cee5a8SShaohua Li nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); 66812cee5a8SShaohua Li has_nonrot_disk |= nonrot; 6699dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 67076073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 67112cee5a8SShaohua Li if (choose_first) { 67276073054SNeilBrown best_disk = disk; 6731da177e4SLinus Torvalds break; 6741da177e4SLinus Torvalds } 67512cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 67612cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 67712cee5a8SShaohua Li || dist == 0) { 67812cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 67912cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 68012cee5a8SShaohua Li 68112cee5a8SShaohua Li best_disk = disk; 68212cee5a8SShaohua Li /* 68312cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 68412cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 68512cee5a8SShaohua Li * the idle disk. read_balance could already choose an 68612cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 68712cee5a8SShaohua Li * this disk. This doesn't matter because this disk 68812cee5a8SShaohua Li * will idle, next time it will be utilized after the 68912cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 69012cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 69112cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 69212cee5a8SShaohua Li * small, but not a big deal since when the second disk 69312cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 69412cee5a8SShaohua Li */ 69512cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 69612cee5a8SShaohua Li mirror->seq_start != MaxSector && 69712cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 69812cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 69912cee5a8SShaohua Li mirror->seq_start) { 70012cee5a8SShaohua Li choose_next_idle = 1; 70112cee5a8SShaohua Li continue; 70212cee5a8SShaohua Li } 70312cee5a8SShaohua Li break; 70412cee5a8SShaohua Li } 70512cee5a8SShaohua Li 70612cee5a8SShaohua Li if (choose_next_idle) 70712cee5a8SShaohua Li continue; 7089dedf603SShaohua Li 7099dedf603SShaohua Li if (min_pending > pending) { 7109dedf603SShaohua Li min_pending = pending; 7119dedf603SShaohua Li best_pending_disk = disk; 7129dedf603SShaohua Li } 7139dedf603SShaohua Li 71476073054SNeilBrown if (dist < best_dist) { 71576073054SNeilBrown best_dist = dist; 7169dedf603SShaohua Li best_dist_disk = disk; 7171da177e4SLinus Torvalds } 718f3ac8bf7SNeilBrown } 7191da177e4SLinus Torvalds 7209dedf603SShaohua Li /* 7219dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 7229dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 7239dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 7249dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 7259dedf603SShaohua Li */ 7269dedf603SShaohua Li if (best_disk == -1) { 7272e52d449SNeilBrown if (has_nonrot_disk || min_pending == 0) 7289dedf603SShaohua Li best_disk = best_pending_disk; 7299dedf603SShaohua Li else 7309dedf603SShaohua Li best_disk = best_dist_disk; 7319dedf603SShaohua Li } 7329dedf603SShaohua Li 73376073054SNeilBrown if (best_disk >= 0) { 73476073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 7358ddf9efeSNeilBrown if (!rdev) 7368ddf9efeSNeilBrown goto retry; 7378ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 738d2eb35acSNeilBrown sectors = best_good_sectors; 73912cee5a8SShaohua Li 74012cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 74112cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 74212cee5a8SShaohua Li 743be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 7441da177e4SLinus Torvalds } 7451da177e4SLinus Torvalds rcu_read_unlock(); 746d2eb35acSNeilBrown *max_sectors = sectors; 7471da177e4SLinus Torvalds 74876073054SNeilBrown return best_disk; 7491da177e4SLinus Torvalds } 7501da177e4SLinus Torvalds 7515c675f83SNeilBrown static int raid1_congested(struct mddev *mddev, int bits) 7520d129228SNeilBrown { 753e8096360SNeilBrown struct r1conf *conf = mddev->private; 7540d129228SNeilBrown int i, ret = 0; 7550d129228SNeilBrown 7564452226eSTejun Heo if ((bits & (1 << WB_async_congested)) && 75734db0cd6SNeilBrown conf->pending_count >= max_queued_requests) 75834db0cd6SNeilBrown return 1; 75934db0cd6SNeilBrown 7600d129228SNeilBrown rcu_read_lock(); 761f53e29fcSNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 7623cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 7630d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 764165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 7650d129228SNeilBrown 7661ed7242eSJonathan Brassow BUG_ON(!q); 7671ed7242eSJonathan Brassow 7680d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 7690d129228SNeilBrown * non-congested targets, it can be removed 7700d129228SNeilBrown */ 7714452226eSTejun Heo if ((bits & (1 << WB_async_congested)) || 1) 772dc3b17ccSJan Kara ret |= bdi_congested(q->backing_dev_info, bits); 7730d129228SNeilBrown else 774dc3b17ccSJan Kara ret &= bdi_congested(q->backing_dev_info, bits); 7750d129228SNeilBrown } 7760d129228SNeilBrown } 7770d129228SNeilBrown rcu_read_unlock(); 7780d129228SNeilBrown return ret; 7790d129228SNeilBrown } 7800d129228SNeilBrown 781673ca68dSNeilBrown static void flush_bio_list(struct r1conf *conf, struct bio *bio) 782a35e63efSNeilBrown { 783673ca68dSNeilBrown /* flush any pending bitmap writes to disk before proceeding w/ I/O */ 784a35e63efSNeilBrown bitmap_unplug(conf->mddev->bitmap); 78534db0cd6SNeilBrown wake_up(&conf->wait_barrier); 786a35e63efSNeilBrown 787a35e63efSNeilBrown while (bio) { /* submit pending writes */ 788a35e63efSNeilBrown struct bio *next = bio->bi_next; 7895e2c7a36SNeilBrown struct md_rdev *rdev = (void*)bio->bi_bdev; 790a35e63efSNeilBrown bio->bi_next = NULL; 7915e2c7a36SNeilBrown bio->bi_bdev = rdev->bdev; 7925e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 7936308d8e3SGuoqing Jiang bio_io_error(bio); 7945e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 7952ff8cc2cSShaohua Li !blk_queue_discard(bdev_get_queue(bio->bi_bdev)))) 7962ff8cc2cSShaohua Li /* Just ignore it */ 7974246a0b6SChristoph Hellwig bio_endio(bio); 7982ff8cc2cSShaohua Li else 799a35e63efSNeilBrown generic_make_request(bio); 800a35e63efSNeilBrown bio = next; 801a35e63efSNeilBrown } 802673ca68dSNeilBrown } 803673ca68dSNeilBrown 804673ca68dSNeilBrown static void flush_pending_writes(struct r1conf *conf) 805673ca68dSNeilBrown { 806673ca68dSNeilBrown /* Any writes that have been queued but are awaiting 807673ca68dSNeilBrown * bitmap updates get flushed here. 808673ca68dSNeilBrown */ 809673ca68dSNeilBrown spin_lock_irq(&conf->device_lock); 810673ca68dSNeilBrown 811673ca68dSNeilBrown if (conf->pending_bio_list.head) { 812673ca68dSNeilBrown struct bio *bio; 813673ca68dSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 814673ca68dSNeilBrown conf->pending_count = 0; 815673ca68dSNeilBrown spin_unlock_irq(&conf->device_lock); 816673ca68dSNeilBrown flush_bio_list(conf, bio); 817a35e63efSNeilBrown } else 818a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 8197eaceaccSJens Axboe } 8207eaceaccSJens Axboe 82117999be4SNeilBrown /* Barriers.... 82217999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 82317999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 82417999be4SNeilBrown * To do this we raise a 'barrier'. 82517999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 82617999be4SNeilBrown * to count how many activities are happening which preclude 82717999be4SNeilBrown * normal IO. 82817999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 82917999be4SNeilBrown * i.e. if nr_pending == 0. 83017999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 83117999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 83217999be4SNeilBrown * is ready, no other operations which require a barrier will start 83317999be4SNeilBrown * until the IO request has had a chance. 83417999be4SNeilBrown * 83517999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 83617999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 83717999be4SNeilBrown * allow_barrier when it has finished its IO. 83817999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 83917999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 84017999be4SNeilBrown * lower_barrier when the particular background IO completes. 8411da177e4SLinus Torvalds */ 842c2fd4c94SNeilBrown static void raise_barrier(struct r1conf *conf, sector_t sector_nr) 8431da177e4SLinus Torvalds { 844fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 845fd76863eScolyli@suse.de 8461da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 8471da177e4SLinus Torvalds 84817999be4SNeilBrown /* Wait until no block IO is waiting */ 849824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 850824e47daScolyli@suse.de !atomic_read(&conf->nr_waiting[idx]), 851eed8c02eSLukas Czerner conf->resync_lock); 85217999be4SNeilBrown 85317999be4SNeilBrown /* block any new IO from starting */ 854824e47daScolyli@suse.de atomic_inc(&conf->barrier[idx]); 855824e47daScolyli@suse.de /* 856824e47daScolyli@suse.de * In raise_barrier() we firstly increase conf->barrier[idx] then 857824e47daScolyli@suse.de * check conf->nr_pending[idx]. In _wait_barrier() we firstly 858824e47daScolyli@suse.de * increase conf->nr_pending[idx] then check conf->barrier[idx]. 859824e47daScolyli@suse.de * A memory barrier here to make sure conf->nr_pending[idx] won't 860824e47daScolyli@suse.de * be fetched before conf->barrier[idx] is increased. Otherwise 861824e47daScolyli@suse.de * there will be a race between raise_barrier() and _wait_barrier(). 862824e47daScolyli@suse.de */ 863824e47daScolyli@suse.de smp_mb__after_atomic(); 86417999be4SNeilBrown 86579ef3a8aSmajianpeng /* For these conditions we must wait: 86679ef3a8aSmajianpeng * A: while the array is in frozen state 867fd76863eScolyli@suse.de * B: while conf->nr_pending[idx] is not 0, meaning regular I/O 868fd76863eScolyli@suse.de * existing in corresponding I/O barrier bucket. 869fd76863eScolyli@suse.de * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches 870fd76863eScolyli@suse.de * max resync count which allowed on current I/O barrier bucket. 87179ef3a8aSmajianpeng */ 87217999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 873b364e3d0Smajianpeng !conf->array_frozen && 874824e47daScolyli@suse.de !atomic_read(&conf->nr_pending[idx]) && 875824e47daScolyli@suse.de atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH, 876eed8c02eSLukas Czerner conf->resync_lock); 87717999be4SNeilBrown 87843ac9b84SXiao Ni atomic_inc(&conf->nr_sync_pending); 8791da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 8801da177e4SLinus Torvalds } 8811da177e4SLinus Torvalds 882fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr) 88317999be4SNeilBrown { 884fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 885fd76863eScolyli@suse.de 886824e47daScolyli@suse.de BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); 887fd76863eScolyli@suse.de 888824e47daScolyli@suse.de atomic_dec(&conf->barrier[idx]); 88943ac9b84SXiao Ni atomic_dec(&conf->nr_sync_pending); 89017999be4SNeilBrown wake_up(&conf->wait_barrier); 89117999be4SNeilBrown } 89217999be4SNeilBrown 893fd76863eScolyli@suse.de static void _wait_barrier(struct r1conf *conf, int idx) 89417999be4SNeilBrown { 895824e47daScolyli@suse.de /* 896824e47daScolyli@suse.de * We need to increase conf->nr_pending[idx] very early here, 897824e47daScolyli@suse.de * then raise_barrier() can be blocked when it waits for 898824e47daScolyli@suse.de * conf->nr_pending[idx] to be 0. Then we can avoid holding 899824e47daScolyli@suse.de * conf->resync_lock when there is no barrier raised in same 900824e47daScolyli@suse.de * barrier unit bucket. Also if the array is frozen, I/O 901824e47daScolyli@suse.de * should be blocked until array is unfrozen. 902824e47daScolyli@suse.de */ 903824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 904824e47daScolyli@suse.de /* 905824e47daScolyli@suse.de * In _wait_barrier() we firstly increase conf->nr_pending[idx], then 906824e47daScolyli@suse.de * check conf->barrier[idx]. In raise_barrier() we firstly increase 907824e47daScolyli@suse.de * conf->barrier[idx], then check conf->nr_pending[idx]. A memory 908824e47daScolyli@suse.de * barrier is necessary here to make sure conf->barrier[idx] won't be 909824e47daScolyli@suse.de * fetched before conf->nr_pending[idx] is increased. Otherwise there 910824e47daScolyli@suse.de * will be a race between _wait_barrier() and raise_barrier(). 911824e47daScolyli@suse.de */ 912824e47daScolyli@suse.de smp_mb__after_atomic(); 91379ef3a8aSmajianpeng 914824e47daScolyli@suse.de /* 915824e47daScolyli@suse.de * Don't worry about checking two atomic_t variables at same time 916824e47daScolyli@suse.de * here. If during we check conf->barrier[idx], the array is 917824e47daScolyli@suse.de * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is 918824e47daScolyli@suse.de * 0, it is safe to return and make the I/O continue. Because the 919824e47daScolyli@suse.de * array is frozen, all I/O returned here will eventually complete 920824e47daScolyli@suse.de * or be queued, no race will happen. See code comment in 921824e47daScolyli@suse.de * frozen_array(). 922824e47daScolyli@suse.de */ 923824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen) && 924824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx])) 925824e47daScolyli@suse.de return; 926824e47daScolyli@suse.de 927824e47daScolyli@suse.de /* 928824e47daScolyli@suse.de * After holding conf->resync_lock, conf->nr_pending[idx] 929824e47daScolyli@suse.de * should be decreased before waiting for barrier to drop. 930824e47daScolyli@suse.de * Otherwise, we may encounter a race condition because 931824e47daScolyli@suse.de * raise_barrer() might be waiting for conf->nr_pending[idx] 932824e47daScolyli@suse.de * to be 0 at same time. 933824e47daScolyli@suse.de */ 934824e47daScolyli@suse.de spin_lock_irq(&conf->resync_lock); 935824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 936824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 937824e47daScolyli@suse.de /* 938824e47daScolyli@suse.de * In case freeze_array() is waiting for 939824e47daScolyli@suse.de * get_unqueued_pending() == extra 940824e47daScolyli@suse.de */ 941824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 942824e47daScolyli@suse.de /* Wait for the barrier in same barrier unit bucket to drop. */ 943824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 944824e47daScolyli@suse.de !conf->array_frozen && 945824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx]), 946824e47daScolyli@suse.de conf->resync_lock); 947824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 948824e47daScolyli@suse.de atomic_dec(&conf->nr_waiting[idx]); 949fd76863eScolyli@suse.de spin_unlock_irq(&conf->resync_lock); 95079ef3a8aSmajianpeng } 95179ef3a8aSmajianpeng 952fd76863eScolyli@suse.de static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) 95379ef3a8aSmajianpeng { 954fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 95579ef3a8aSmajianpeng 956824e47daScolyli@suse.de /* 957824e47daScolyli@suse.de * Very similar to _wait_barrier(). The difference is, for read 958824e47daScolyli@suse.de * I/O we don't need wait for sync I/O, but if the whole array 959824e47daScolyli@suse.de * is frozen, the read I/O still has to wait until the array is 960824e47daScolyli@suse.de * unfrozen. Since there is no ordering requirement with 961824e47daScolyli@suse.de * conf->barrier[idx] here, memory barrier is unnecessary as well. 962824e47daScolyli@suse.de */ 963824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 964824e47daScolyli@suse.de 965824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen)) 966824e47daScolyli@suse.de return; 96717999be4SNeilBrown 96817999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 969824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 970824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 971824e47daScolyli@suse.de /* 972824e47daScolyli@suse.de * In case freeze_array() is waiting for 973824e47daScolyli@suse.de * get_unqueued_pending() == extra 974d6b42dcbSNeilBrown */ 97517999be4SNeilBrown wake_up(&conf->wait_barrier); 976824e47daScolyli@suse.de /* Wait for array to be unfrozen */ 977824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 978fd76863eScolyli@suse.de !conf->array_frozen, 9791da177e4SLinus Torvalds conf->resync_lock); 980824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 981824e47daScolyli@suse.de atomic_dec(&conf->nr_waiting[idx]); 98217999be4SNeilBrown spin_unlock_irq(&conf->resync_lock); 98317999be4SNeilBrown } 98417999be4SNeilBrown 985fd76863eScolyli@suse.de static void wait_barrier(struct r1conf *conf, sector_t sector_nr) 986fd76863eScolyli@suse.de { 987fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 988fd76863eScolyli@suse.de 989fd76863eScolyli@suse.de _wait_barrier(conf, idx); 990fd76863eScolyli@suse.de } 991fd76863eScolyli@suse.de 992fd76863eScolyli@suse.de static void wait_all_barriers(struct r1conf *conf) 993fd76863eScolyli@suse.de { 994fd76863eScolyli@suse.de int idx; 995fd76863eScolyli@suse.de 996fd76863eScolyli@suse.de for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 997fd76863eScolyli@suse.de _wait_barrier(conf, idx); 998fd76863eScolyli@suse.de } 999fd76863eScolyli@suse.de 1000fd76863eScolyli@suse.de static void _allow_barrier(struct r1conf *conf, int idx) 100117999be4SNeilBrown { 1002824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 100317999be4SNeilBrown wake_up(&conf->wait_barrier); 100417999be4SNeilBrown } 100517999be4SNeilBrown 1006fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr) 1007fd76863eScolyli@suse.de { 1008fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1009fd76863eScolyli@suse.de 1010fd76863eScolyli@suse.de _allow_barrier(conf, idx); 1011fd76863eScolyli@suse.de } 1012fd76863eScolyli@suse.de 1013fd76863eScolyli@suse.de static void allow_all_barriers(struct r1conf *conf) 1014fd76863eScolyli@suse.de { 1015fd76863eScolyli@suse.de int idx; 1016fd76863eScolyli@suse.de 1017fd76863eScolyli@suse.de for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1018fd76863eScolyli@suse.de _allow_barrier(conf, idx); 1019fd76863eScolyli@suse.de } 1020fd76863eScolyli@suse.de 1021fd76863eScolyli@suse.de /* conf->resync_lock should be held */ 1022fd76863eScolyli@suse.de static int get_unqueued_pending(struct r1conf *conf) 1023fd76863eScolyli@suse.de { 1024fd76863eScolyli@suse.de int idx, ret; 1025fd76863eScolyli@suse.de 102643ac9b84SXiao Ni ret = atomic_read(&conf->nr_sync_pending); 102743ac9b84SXiao Ni for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1028824e47daScolyli@suse.de ret += atomic_read(&conf->nr_pending[idx]) - 1029824e47daScolyli@suse.de atomic_read(&conf->nr_queued[idx]); 1030fd76863eScolyli@suse.de 1031fd76863eScolyli@suse.de return ret; 103217999be4SNeilBrown } 103317999be4SNeilBrown 1034e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra) 1035ddaf22abSNeilBrown { 1036fd76863eScolyli@suse.de /* Stop sync I/O and normal I/O and wait for everything to 103711353b9dSZhilong Liu * go quiet. 1038fd76863eScolyli@suse.de * This is called in two situations: 1039fd76863eScolyli@suse.de * 1) management command handlers (reshape, remove disk, quiesce). 1040fd76863eScolyli@suse.de * 2) one normal I/O request failed. 1041fd76863eScolyli@suse.de 1042fd76863eScolyli@suse.de * After array_frozen is set to 1, new sync IO will be blocked at 1043fd76863eScolyli@suse.de * raise_barrier(), and new normal I/O will blocked at _wait_barrier() 1044fd76863eScolyli@suse.de * or wait_read_barrier(). The flying I/Os will either complete or be 1045fd76863eScolyli@suse.de * queued. When everything goes quite, there are only queued I/Os left. 1046fd76863eScolyli@suse.de 1047fd76863eScolyli@suse.de * Every flying I/O contributes to a conf->nr_pending[idx], idx is the 1048fd76863eScolyli@suse.de * barrier bucket index which this I/O request hits. When all sync and 1049fd76863eScolyli@suse.de * normal I/O are queued, sum of all conf->nr_pending[] will match sum 1050fd76863eScolyli@suse.de * of all conf->nr_queued[]. But normal I/O failure is an exception, 1051fd76863eScolyli@suse.de * in handle_read_error(), we may call freeze_array() before trying to 1052fd76863eScolyli@suse.de * fix the read error. In this case, the error read I/O is not queued, 1053fd76863eScolyli@suse.de * so get_unqueued_pending() == 1. 1054fd76863eScolyli@suse.de * 1055fd76863eScolyli@suse.de * Therefore before this function returns, we need to wait until 1056fd76863eScolyli@suse.de * get_unqueued_pendings(conf) gets equal to extra. For 1057fd76863eScolyli@suse.de * normal I/O context, extra is 1, in rested situations extra is 0. 1058ddaf22abSNeilBrown */ 1059ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1060b364e3d0Smajianpeng conf->array_frozen = 1; 1061578b54adSNeilBrown raid1_log(conf->mddev, "wait freeze"); 1062fd76863eScolyli@suse.de wait_event_lock_irq_cmd( 1063fd76863eScolyli@suse.de conf->wait_barrier, 1064fd76863eScolyli@suse.de get_unqueued_pending(conf) == extra, 1065ddaf22abSNeilBrown conf->resync_lock, 1066c3b328acSNeilBrown flush_pending_writes(conf)); 1067ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1068ddaf22abSNeilBrown } 1069e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 1070ddaf22abSNeilBrown { 1071ddaf22abSNeilBrown /* reverse the effect of the freeze */ 1072ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1073b364e3d0Smajianpeng conf->array_frozen = 0; 1074ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1075824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 1076ddaf22abSNeilBrown } 1077ddaf22abSNeilBrown 107816d56e2fSShaohua Li static void alloc_behind_master_bio(struct r1bio *r1_bio, 1079cb83efcfSNeilBrown struct bio *bio) 10804b6d287fSNeilBrown { 1081cb83efcfSNeilBrown int size = bio->bi_iter.bi_size; 1082841c1316SMing Lei unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 1083841c1316SMing Lei int i = 0; 1084841c1316SMing Lei struct bio *behind_bio = NULL; 10854b6d287fSNeilBrown 1086841c1316SMing Lei behind_bio = bio_alloc_mddev(GFP_NOIO, vcnt, r1_bio->mddev); 1087841c1316SMing Lei if (!behind_bio) 108816d56e2fSShaohua Li return; 1089841c1316SMing Lei 109041743c1fSShaohua Li /* discard op, we don't support writezero/writesame yet */ 109116d56e2fSShaohua Li if (!bio_has_data(bio)) { 109216d56e2fSShaohua Li behind_bio->bi_iter.bi_size = size; 109341743c1fSShaohua Li goto skip_copy; 109416d56e2fSShaohua Li } 109541743c1fSShaohua Li 1096841c1316SMing Lei while (i < vcnt && size) { 1097841c1316SMing Lei struct page *page; 1098841c1316SMing Lei int len = min_t(int, PAGE_SIZE, size); 1099841c1316SMing Lei 1100841c1316SMing Lei page = alloc_page(GFP_NOIO); 1101841c1316SMing Lei if (unlikely(!page)) 1102841c1316SMing Lei goto free_pages; 1103841c1316SMing Lei 1104841c1316SMing Lei bio_add_page(behind_bio, page, len, 0); 1105841c1316SMing Lei 1106841c1316SMing Lei size -= len; 1107841c1316SMing Lei i++; 11084b6d287fSNeilBrown } 11094b6d287fSNeilBrown 1110cb83efcfSNeilBrown bio_copy_data(behind_bio, bio); 111141743c1fSShaohua Li skip_copy: 1112841c1316SMing Lei r1_bio->behind_master_bio = behind_bio;; 1113841c1316SMing Lei set_bit(R1BIO_BehindIO, &r1_bio->state); 1114841c1316SMing Lei 111516d56e2fSShaohua Li return; 1116841c1316SMing Lei 1117841c1316SMing Lei free_pages: 11184f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n", 11194f024f37SKent Overstreet bio->bi_iter.bi_size); 1120841c1316SMing Lei bio_free_pages(behind_bio); 112116d56e2fSShaohua Li bio_put(behind_bio); 11224b6d287fSNeilBrown } 11234b6d287fSNeilBrown 1124f54a9d0eSNeilBrown struct raid1_plug_cb { 1125f54a9d0eSNeilBrown struct blk_plug_cb cb; 1126f54a9d0eSNeilBrown struct bio_list pending; 1127f54a9d0eSNeilBrown int pending_cnt; 1128f54a9d0eSNeilBrown }; 1129f54a9d0eSNeilBrown 1130f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) 1131f54a9d0eSNeilBrown { 1132f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, 1133f54a9d0eSNeilBrown cb); 1134f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data; 1135f54a9d0eSNeilBrown struct r1conf *conf = mddev->private; 1136f54a9d0eSNeilBrown struct bio *bio; 1137f54a9d0eSNeilBrown 1138874807a8SNeilBrown if (from_schedule || current->bio_list) { 1139f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock); 1140f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending); 1141f54a9d0eSNeilBrown conf->pending_count += plug->pending_cnt; 1142f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock); 1143ee0b0244SNeilBrown wake_up(&conf->wait_barrier); 1144f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread); 1145f54a9d0eSNeilBrown kfree(plug); 1146f54a9d0eSNeilBrown return; 1147f54a9d0eSNeilBrown } 1148f54a9d0eSNeilBrown 1149f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */ 1150f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending); 1151673ca68dSNeilBrown flush_bio_list(conf, bio); 1152f54a9d0eSNeilBrown kfree(plug); 1153f54a9d0eSNeilBrown } 1154f54a9d0eSNeilBrown 1155689389a0SNeilBrown static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) 1156689389a0SNeilBrown { 1157689389a0SNeilBrown r1_bio->master_bio = bio; 1158689389a0SNeilBrown r1_bio->sectors = bio_sectors(bio); 1159689389a0SNeilBrown r1_bio->state = 0; 1160689389a0SNeilBrown r1_bio->mddev = mddev; 1161689389a0SNeilBrown r1_bio->sector = bio->bi_iter.bi_sector; 1162689389a0SNeilBrown } 1163689389a0SNeilBrown 1164fd76863eScolyli@suse.de static inline struct r1bio * 1165689389a0SNeilBrown alloc_r1bio(struct mddev *mddev, struct bio *bio) 1166fd76863eScolyli@suse.de { 1167fd76863eScolyli@suse.de struct r1conf *conf = mddev->private; 1168fd76863eScolyli@suse.de struct r1bio *r1_bio; 1169fd76863eScolyli@suse.de 1170fd76863eScolyli@suse.de r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 1171689389a0SNeilBrown /* Ensure no bio records IO_BLOCKED */ 1172689389a0SNeilBrown memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); 1173689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio); 1174fd76863eScolyli@suse.de return r1_bio; 1175fd76863eScolyli@suse.de } 1176fd76863eScolyli@suse.de 1177c230e7e5SNeilBrown static void raid1_read_request(struct mddev *mddev, struct bio *bio, 1178689389a0SNeilBrown int max_read_sectors, struct r1bio *r1_bio) 11791da177e4SLinus Torvalds { 1180e8096360SNeilBrown struct r1conf *conf = mddev->private; 11810eaf822cSJonathan Brassow struct raid1_info *mirror; 11821da177e4SLinus Torvalds struct bio *read_bio; 11833b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 1184796a5cf0SMike Christie const int op = bio_op(bio); 11851eff9d32SJens Axboe const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); 11861f68f0c4SNeilBrown int max_sectors; 1187d2eb35acSNeilBrown int rdisk; 1188689389a0SNeilBrown bool print_msg = !!r1_bio; 1189689389a0SNeilBrown char b[BDEVNAME_SIZE]; 1190689389a0SNeilBrown 1191689389a0SNeilBrown /* 1192689389a0SNeilBrown * If r1_bio is set, we are blocking the raid1d thread 1193689389a0SNeilBrown * so there is a tiny risk of deadlock. So ask for 1194689389a0SNeilBrown * emergency memory if needed. 1195689389a0SNeilBrown */ 1196689389a0SNeilBrown gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; 1197689389a0SNeilBrown 1198689389a0SNeilBrown if (print_msg) { 1199689389a0SNeilBrown /* Need to get the block device name carefully */ 1200689389a0SNeilBrown struct md_rdev *rdev; 1201689389a0SNeilBrown rcu_read_lock(); 1202689389a0SNeilBrown rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); 1203689389a0SNeilBrown if (rdev) 1204689389a0SNeilBrown bdevname(rdev->bdev, b); 1205689389a0SNeilBrown else 1206689389a0SNeilBrown strcpy(b, "???"); 1207689389a0SNeilBrown rcu_read_unlock(); 1208689389a0SNeilBrown } 1209d2eb35acSNeilBrown 1210fd76863eScolyli@suse.de /* 1211fd76863eScolyli@suse.de * Still need barrier for READ in case that whole 1212fd76863eScolyli@suse.de * array is frozen. 1213fd76863eScolyli@suse.de */ 1214fd76863eScolyli@suse.de wait_read_barrier(conf, bio->bi_iter.bi_sector); 12153b046a97SRobert LeBlanc 1216689389a0SNeilBrown if (!r1_bio) 1217689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio); 1218689389a0SNeilBrown else 1219689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio); 1220c230e7e5SNeilBrown r1_bio->sectors = max_read_sectors; 1221fd76863eScolyli@suse.de 1222fd76863eScolyli@suse.de /* 1223fd76863eScolyli@suse.de * make_request() can abort the operation when read-ahead is being 1224fd76863eScolyli@suse.de * used and no empty request is available. 1225fd76863eScolyli@suse.de */ 1226d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 12271da177e4SLinus Torvalds 12281da177e4SLinus Torvalds if (rdisk < 0) { 12291da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 1230689389a0SNeilBrown if (print_msg) { 1231689389a0SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 1232689389a0SNeilBrown mdname(mddev), 1233689389a0SNeilBrown b, 1234689389a0SNeilBrown (unsigned long long)r1_bio->sector); 1235689389a0SNeilBrown } 12361da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 12375a7bbad2SChristoph Hellwig return; 12381da177e4SLinus Torvalds } 12391da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 12401da177e4SLinus Torvalds 1241689389a0SNeilBrown if (print_msg) 1242689389a0SNeilBrown pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", 1243689389a0SNeilBrown mdname(mddev), 1244689389a0SNeilBrown (unsigned long long)r1_bio->sector, 1245689389a0SNeilBrown bdevname(mirror->rdev->bdev, b)); 1246689389a0SNeilBrown 1247e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1248e555190dSNeilBrown bitmap) { 12493b046a97SRobert LeBlanc /* 12503b046a97SRobert LeBlanc * Reading from a write-mostly device must take care not to 12513b046a97SRobert LeBlanc * over-take any writes that are 'behind' 1252e555190dSNeilBrown */ 1253578b54adSNeilBrown raid1_log(mddev, "wait behind writes"); 1254e555190dSNeilBrown wait_event(bitmap->behind_wait, 1255e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 1256e555190dSNeilBrown } 1257c230e7e5SNeilBrown 1258c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1259c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1260689389a0SNeilBrown gfp, conf->bio_split); 1261c230e7e5SNeilBrown bio_chain(split, bio); 1262c230e7e5SNeilBrown generic_make_request(bio); 1263c230e7e5SNeilBrown bio = split; 1264c230e7e5SNeilBrown r1_bio->master_bio = bio; 1265c230e7e5SNeilBrown r1_bio->sectors = max_sectors; 1266c230e7e5SNeilBrown } 1267c230e7e5SNeilBrown 12681da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 12691da177e4SLinus Torvalds 1270689389a0SNeilBrown read_bio = bio_clone_fast(bio, gfp, mddev->bio_set); 12711da177e4SLinus Torvalds 12721da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 12731da177e4SLinus Torvalds 12744f024f37SKent Overstreet read_bio->bi_iter.bi_sector = r1_bio->sector + 12754f024f37SKent Overstreet mirror->rdev->data_offset; 12761da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 12771da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 1278796a5cf0SMike Christie bio_set_op_attrs(read_bio, op, do_sync); 12792e52d449SNeilBrown if (test_bit(FailFast, &mirror->rdev->flags) && 12802e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 12812e52d449SNeilBrown read_bio->bi_opf |= MD_FAILFAST; 12821da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 12831da177e4SLinus Torvalds 1284109e3765SNeilBrown if (mddev->gendisk) 1285109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(read_bio->bi_bdev), 1286109e3765SNeilBrown read_bio, disk_devt(mddev->gendisk), 1287109e3765SNeilBrown r1_bio->sector); 1288109e3765SNeilBrown 12891da177e4SLinus Torvalds generic_make_request(read_bio); 12901da177e4SLinus Torvalds } 12911da177e4SLinus Torvalds 1292c230e7e5SNeilBrown static void raid1_write_request(struct mddev *mddev, struct bio *bio, 1293c230e7e5SNeilBrown int max_write_sectors) 12943b046a97SRobert LeBlanc { 12953b046a97SRobert LeBlanc struct r1conf *conf = mddev->private; 1296fd76863eScolyli@suse.de struct r1bio *r1_bio; 12973b046a97SRobert LeBlanc int i, disks; 12983b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 12993b046a97SRobert LeBlanc unsigned long flags; 13003b046a97SRobert LeBlanc struct md_rdev *blocked_rdev; 13013b046a97SRobert LeBlanc struct blk_plug_cb *cb; 13023b046a97SRobert LeBlanc struct raid1_plug_cb *plug = NULL; 13033b046a97SRobert LeBlanc int first_clone; 13043b046a97SRobert LeBlanc int max_sectors; 13053b046a97SRobert LeBlanc 13061da177e4SLinus Torvalds /* 13073b046a97SRobert LeBlanc * Register the new request and wait if the reconstruction 13083b046a97SRobert LeBlanc * thread has put up a bar for new requests. 13093b046a97SRobert LeBlanc * Continue immediately if no resync is active currently. 13101da177e4SLinus Torvalds */ 13113b046a97SRobert LeBlanc 13123b046a97SRobert LeBlanc 13133b046a97SRobert LeBlanc if ((bio_end_sector(bio) > mddev->suspend_lo && 13143b046a97SRobert LeBlanc bio->bi_iter.bi_sector < mddev->suspend_hi) || 13153b046a97SRobert LeBlanc (mddev_is_clustered(mddev) && 13163b046a97SRobert LeBlanc md_cluster_ops->area_resyncing(mddev, WRITE, 13173b046a97SRobert LeBlanc bio->bi_iter.bi_sector, bio_end_sector(bio)))) { 13183b046a97SRobert LeBlanc 13193b046a97SRobert LeBlanc /* 13203b046a97SRobert LeBlanc * As the suspend_* range is controlled by userspace, we want 13213b046a97SRobert LeBlanc * an interruptible wait. 13223b046a97SRobert LeBlanc */ 13233b046a97SRobert LeBlanc DEFINE_WAIT(w); 13243b046a97SRobert LeBlanc for (;;) { 1325f9c79bc0SMikulas Patocka sigset_t full, old; 13263b046a97SRobert LeBlanc prepare_to_wait(&conf->wait_barrier, 13273b046a97SRobert LeBlanc &w, TASK_INTERRUPTIBLE); 13283b046a97SRobert LeBlanc if (bio_end_sector(bio) <= mddev->suspend_lo || 13293b046a97SRobert LeBlanc bio->bi_iter.bi_sector >= mddev->suspend_hi || 13303b046a97SRobert LeBlanc (mddev_is_clustered(mddev) && 13313b046a97SRobert LeBlanc !md_cluster_ops->area_resyncing(mddev, WRITE, 13323b046a97SRobert LeBlanc bio->bi_iter.bi_sector, 13333b046a97SRobert LeBlanc bio_end_sector(bio)))) 13343b046a97SRobert LeBlanc break; 1335f9c79bc0SMikulas Patocka sigfillset(&full); 1336f9c79bc0SMikulas Patocka sigprocmask(SIG_BLOCK, &full, &old); 13373b046a97SRobert LeBlanc schedule(); 1338f9c79bc0SMikulas Patocka sigprocmask(SIG_SETMASK, &old, NULL); 13393b046a97SRobert LeBlanc } 13403b046a97SRobert LeBlanc finish_wait(&conf->wait_barrier, &w); 13413b046a97SRobert LeBlanc } 1342fd76863eScolyli@suse.de wait_barrier(conf, bio->bi_iter.bi_sector); 1343fd76863eScolyli@suse.de 1344689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio); 1345c230e7e5SNeilBrown r1_bio->sectors = max_write_sectors; 13463b046a97SRobert LeBlanc 134734db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 134834db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 1349578b54adSNeilBrown raid1_log(mddev, "wait queued"); 135034db0cd6SNeilBrown wait_event(conf->wait_barrier, 135134db0cd6SNeilBrown conf->pending_count < max_queued_requests); 135234db0cd6SNeilBrown } 13531f68f0c4SNeilBrown /* first select target devices under rcu_lock and 13541da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 13551da177e4SLinus Torvalds * bios[x] to bio 13561f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 13571f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 13581f68f0c4SNeilBrown * blocks. 13591f68f0c4SNeilBrown * This potentially requires several writes to write around 13601f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 13611f68f0c4SNeilBrown * with a set of bios attached. 13621da177e4SLinus Torvalds */ 1363c3b328acSNeilBrown 13648f19ccb2SNeilBrown disks = conf->raid_disks * 2; 13656bfe0b49SDan Williams retry_write: 13666bfe0b49SDan Williams blocked_rdev = NULL; 13671da177e4SLinus Torvalds rcu_read_lock(); 13681f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 13691da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 13703cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 13716bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 13726bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 13736bfe0b49SDan Williams blocked_rdev = rdev; 13746bfe0b49SDan Williams break; 13756bfe0b49SDan Williams } 13761da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 13778ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) { 13788f19ccb2SNeilBrown if (i < conf->raid_disks) 13791f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 13801f68f0c4SNeilBrown continue; 1381964147d5SNeilBrown } 13821f68f0c4SNeilBrown 13831f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 13841f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 13851f68f0c4SNeilBrown sector_t first_bad; 13861f68f0c4SNeilBrown int bad_sectors; 13871f68f0c4SNeilBrown int is_bad; 13881f68f0c4SNeilBrown 13893b046a97SRobert LeBlanc is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, 13901f68f0c4SNeilBrown &first_bad, &bad_sectors); 13911f68f0c4SNeilBrown if (is_bad < 0) { 13921f68f0c4SNeilBrown /* mustn't write here until the bad block is 13931f68f0c4SNeilBrown * acknowledged*/ 13941f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 13951f68f0c4SNeilBrown blocked_rdev = rdev; 13961f68f0c4SNeilBrown break; 13971f68f0c4SNeilBrown } 13981f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 13991f68f0c4SNeilBrown /* Cannot write here at all */ 14001f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 14011f68f0c4SNeilBrown if (bad_sectors < max_sectors) 14021f68f0c4SNeilBrown /* mustn't write more than bad_sectors 14031f68f0c4SNeilBrown * to other devices yet 14041f68f0c4SNeilBrown */ 14051f68f0c4SNeilBrown max_sectors = bad_sectors; 14061f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 14071f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 14081f68f0c4SNeilBrown * only applies if the disk is 14091f68f0c4SNeilBrown * missing, so it might be re-added, 14101f68f0c4SNeilBrown * and we want to know to recover this 14111f68f0c4SNeilBrown * chunk. 14121f68f0c4SNeilBrown * In this case the device is here, 14131f68f0c4SNeilBrown * and the fact that this chunk is not 14141f68f0c4SNeilBrown * in-sync is recorded in the bad 14151f68f0c4SNeilBrown * block log 14161f68f0c4SNeilBrown */ 14171f68f0c4SNeilBrown continue; 14181f68f0c4SNeilBrown } 14191f68f0c4SNeilBrown if (is_bad) { 14201f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 14211f68f0c4SNeilBrown if (good_sectors < max_sectors) 14221f68f0c4SNeilBrown max_sectors = good_sectors; 14231f68f0c4SNeilBrown } 14241f68f0c4SNeilBrown } 14251f68f0c4SNeilBrown r1_bio->bios[i] = bio; 14261da177e4SLinus Torvalds } 14271da177e4SLinus Torvalds rcu_read_unlock(); 14281da177e4SLinus Torvalds 14296bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 14306bfe0b49SDan Williams /* Wait for this device to become unblocked */ 14316bfe0b49SDan Williams int j; 14326bfe0b49SDan Williams 14336bfe0b49SDan Williams for (j = 0; j < i; j++) 14346bfe0b49SDan Williams if (r1_bio->bios[j]) 14356bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 14361f68f0c4SNeilBrown r1_bio->state = 0; 1437fd76863eScolyli@suse.de allow_barrier(conf, bio->bi_iter.bi_sector); 1438578b54adSNeilBrown raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); 14396bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 1440fd76863eScolyli@suse.de wait_barrier(conf, bio->bi_iter.bi_sector); 14416bfe0b49SDan Williams goto retry_write; 14426bfe0b49SDan Williams } 14436bfe0b49SDan Williams 1444c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1445c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1446c230e7e5SNeilBrown GFP_NOIO, conf->bio_split); 1447c230e7e5SNeilBrown bio_chain(split, bio); 1448c230e7e5SNeilBrown generic_make_request(bio); 1449c230e7e5SNeilBrown bio = split; 1450c230e7e5SNeilBrown r1_bio->master_bio = bio; 14511f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 1452191ea9b2SNeilBrown } 14534b6d287fSNeilBrown 14544e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 14554b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1456191ea9b2SNeilBrown 14571f68f0c4SNeilBrown first_clone = 1; 1458d8c84c4fSMing Lei 14591da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 14608e58e327SMing Lei struct bio *mbio = NULL; 14611da177e4SLinus Torvalds if (!r1_bio->bios[i]) 14621da177e4SLinus Torvalds continue; 14631da177e4SLinus Torvalds 14641da177e4SLinus Torvalds 14651f68f0c4SNeilBrown if (first_clone) { 14661f68f0c4SNeilBrown /* do behind I/O ? 14671f68f0c4SNeilBrown * Not if there are too many, or cannot 14681f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 14691f68f0c4SNeilBrown * is waiting for behind writes to flush */ 14701f68f0c4SNeilBrown if (bitmap && 14711f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 14721f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 14738e58e327SMing Lei !waitqueue_active(&bitmap->behind_wait)) { 147416d56e2fSShaohua Li alloc_behind_master_bio(r1_bio, bio); 14758e58e327SMing Lei } 14761da177e4SLinus Torvalds 14771f68f0c4SNeilBrown bitmap_startwrite(bitmap, r1_bio->sector, 14781f68f0c4SNeilBrown r1_bio->sectors, 14791f68f0c4SNeilBrown test_bit(R1BIO_BehindIO, 14801f68f0c4SNeilBrown &r1_bio->state)); 14811f68f0c4SNeilBrown first_clone = 0; 14821f68f0c4SNeilBrown } 14838e58e327SMing Lei 1484841c1316SMing Lei if (r1_bio->behind_master_bio) 1485841c1316SMing Lei mbio = bio_clone_fast(r1_bio->behind_master_bio, 148616d56e2fSShaohua Li GFP_NOIO, mddev->bio_set); 1487c230e7e5SNeilBrown else 1488d7a10308SMing Lei mbio = bio_clone_fast(bio, GFP_NOIO, mddev->bio_set); 14898e58e327SMing Lei 1490841c1316SMing Lei if (r1_bio->behind_master_bio) { 14914b6d287fSNeilBrown if (test_bit(WriteMostly, &conf->mirrors[i].rdev->flags)) 14924b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 14934b6d287fSNeilBrown } 14944b6d287fSNeilBrown 14951f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 14961f68f0c4SNeilBrown 14974f024f37SKent Overstreet mbio->bi_iter.bi_sector = (r1_bio->sector + 14981f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 1499109e3765SNeilBrown mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 15001f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 1501a682e003SLinus Torvalds mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); 1502212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && 1503212e7eb7SNeilBrown !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && 1504212e7eb7SNeilBrown conf->raid_disks - mddev->degraded > 1) 1505212e7eb7SNeilBrown mbio->bi_opf |= MD_FAILFAST; 15061f68f0c4SNeilBrown mbio->bi_private = r1_bio; 15071f68f0c4SNeilBrown 15081da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1509f54a9d0eSNeilBrown 1510109e3765SNeilBrown if (mddev->gendisk) 1511109e3765SNeilBrown trace_block_bio_remap(bdev_get_queue(mbio->bi_bdev), 1512109e3765SNeilBrown mbio, disk_devt(mddev->gendisk), 1513109e3765SNeilBrown r1_bio->sector); 1514109e3765SNeilBrown /* flush_pending_writes() needs access to the rdev so...*/ 1515109e3765SNeilBrown mbio->bi_bdev = (void*)conf->mirrors[i].rdev; 1516109e3765SNeilBrown 1517f54a9d0eSNeilBrown cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); 1518f54a9d0eSNeilBrown if (cb) 1519f54a9d0eSNeilBrown plug = container_of(cb, struct raid1_plug_cb, cb); 1520f54a9d0eSNeilBrown else 1521f54a9d0eSNeilBrown plug = NULL; 1522f54a9d0eSNeilBrown if (plug) { 1523f54a9d0eSNeilBrown bio_list_add(&plug->pending, mbio); 1524f54a9d0eSNeilBrown plug->pending_cnt++; 1525f54a9d0eSNeilBrown } else { 152623b245c0SShaohua Li spin_lock_irqsave(&conf->device_lock, flags); 15274e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 152834db0cd6SNeilBrown conf->pending_count++; 1529191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1530b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 15314e78064fSNeilBrown } 153223b245c0SShaohua Li } 15331f68f0c4SNeilBrown 1534079fa166SNeilBrown r1_bio_write_done(r1_bio); 1535079fa166SNeilBrown 1536079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1537079fa166SNeilBrown wake_up(&conf->wait_barrier); 15381da177e4SLinus Torvalds } 15391da177e4SLinus Torvalds 1540cc27b0c7SNeilBrown static bool raid1_make_request(struct mddev *mddev, struct bio *bio) 15413b046a97SRobert LeBlanc { 1542fd76863eScolyli@suse.de sector_t sectors; 15433b046a97SRobert LeBlanc 1544aff8da09SShaohua Li if (unlikely(bio->bi_opf & REQ_PREFLUSH)) { 1545aff8da09SShaohua Li md_flush_request(mddev, bio); 1546cc27b0c7SNeilBrown return true; 1547aff8da09SShaohua Li } 15483b046a97SRobert LeBlanc 1549c230e7e5SNeilBrown /* 1550c230e7e5SNeilBrown * There is a limit to the maximum size, but 1551c230e7e5SNeilBrown * the read/write handler might find a lower limit 1552c230e7e5SNeilBrown * due to bad blocks. To avoid multiple splits, 1553c230e7e5SNeilBrown * we pass the maximum number of sectors down 1554c230e7e5SNeilBrown * and let the lower level perform the split. 1555c230e7e5SNeilBrown */ 1556fd76863eScolyli@suse.de sectors = align_to_barrier_unit_end( 1557fd76863eScolyli@suse.de bio->bi_iter.bi_sector, bio_sectors(bio)); 15583b046a97SRobert LeBlanc 1559c230e7e5SNeilBrown if (bio_data_dir(bio) == READ) 1560689389a0SNeilBrown raid1_read_request(mddev, bio, sectors, NULL); 1561cc27b0c7SNeilBrown else { 1562cc27b0c7SNeilBrown if (!md_write_start(mddev,bio)) 1563cc27b0c7SNeilBrown return false; 1564c230e7e5SNeilBrown raid1_write_request(mddev, bio, sectors); 15653b046a97SRobert LeBlanc } 1566cc27b0c7SNeilBrown return true; 1567cc27b0c7SNeilBrown } 15683b046a97SRobert LeBlanc 1569849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev) 15701da177e4SLinus Torvalds { 1571e8096360SNeilBrown struct r1conf *conf = mddev->private; 15721da177e4SLinus Torvalds int i; 15731da177e4SLinus Torvalds 15741da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 157511ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1576ddac7c7eSNeilBrown rcu_read_lock(); 1577ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 15783cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 15791da177e4SLinus Torvalds seq_printf(seq, "%s", 1580ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1581ddac7c7eSNeilBrown } 1582ddac7c7eSNeilBrown rcu_read_unlock(); 15831da177e4SLinus Torvalds seq_printf(seq, "]"); 15841da177e4SLinus Torvalds } 15851da177e4SLinus Torvalds 1586849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) 15871da177e4SLinus Torvalds { 15881da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1589e8096360SNeilBrown struct r1conf *conf = mddev->private; 1590423f04d6SNeilBrown unsigned long flags; 15911da177e4SLinus Torvalds 15921da177e4SLinus Torvalds /* 15931da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 15941da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 15951da177e4SLinus Torvalds * next level up know. 15961da177e4SLinus Torvalds * else mark the drive as failed 15971da177e4SLinus Torvalds */ 15982e52d449SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 1599b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) 16004044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 16011da177e4SLinus Torvalds /* 16021da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 16034044ba58SNeilBrown * normal single drive. 16044044ba58SNeilBrown * However don't try a recovery from this drive as 16054044ba58SNeilBrown * it is very likely to fail. 16061da177e4SLinus Torvalds */ 16075389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 16082e52d449SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16091da177e4SLinus Torvalds return; 16104044ba58SNeilBrown } 1611de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1612423f04d6SNeilBrown if (test_and_clear_bit(In_sync, &rdev->flags)) { 16131da177e4SLinus Torvalds mddev->degraded++; 1614dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 16152446dba0SNeilBrown } else 16162446dba0SNeilBrown set_bit(Faulty, &rdev->flags); 1617423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16181da177e4SLinus Torvalds /* 16191da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 16201da177e4SLinus Torvalds */ 1621dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 16222953079cSShaohua Li set_mask_bits(&mddev->sb_flags, 0, 16232953079cSShaohua Li BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); 16241d41c216SNeilBrown pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" 1625067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 16269dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 16279dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 16281da177e4SLinus Torvalds } 16291da177e4SLinus Torvalds 1630e8096360SNeilBrown static void print_conf(struct r1conf *conf) 16311da177e4SLinus Torvalds { 16321da177e4SLinus Torvalds int i; 16331da177e4SLinus Torvalds 16341d41c216SNeilBrown pr_debug("RAID1 conf printout:\n"); 16351da177e4SLinus Torvalds if (!conf) { 16361d41c216SNeilBrown pr_debug("(!conf)\n"); 16371da177e4SLinus Torvalds return; 16381da177e4SLinus Torvalds } 16391d41c216SNeilBrown pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 16401da177e4SLinus Torvalds conf->raid_disks); 16411da177e4SLinus Torvalds 1642ddac7c7eSNeilBrown rcu_read_lock(); 16431da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 16441da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 16453cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1646ddac7c7eSNeilBrown if (rdev) 16471d41c216SNeilBrown pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", 1648ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1649ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1650ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 16511da177e4SLinus Torvalds } 1652ddac7c7eSNeilBrown rcu_read_unlock(); 16531da177e4SLinus Torvalds } 16541da177e4SLinus Torvalds 1655e8096360SNeilBrown static void close_sync(struct r1conf *conf) 16561da177e4SLinus Torvalds { 1657fd76863eScolyli@suse.de wait_all_barriers(conf); 1658fd76863eScolyli@suse.de allow_all_barriers(conf); 16591da177e4SLinus Torvalds 16601da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 16611da177e4SLinus Torvalds conf->r1buf_pool = NULL; 16621da177e4SLinus Torvalds } 16631da177e4SLinus Torvalds 1664fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 16651da177e4SLinus Torvalds { 16661da177e4SLinus Torvalds int i; 1667e8096360SNeilBrown struct r1conf *conf = mddev->private; 16686b965620SNeilBrown int count = 0; 16696b965620SNeilBrown unsigned long flags; 16701da177e4SLinus Torvalds 16711da177e4SLinus Torvalds /* 16721da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1673ddac7c7eSNeilBrown * and mark them readable. 1674ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 1675423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request 1676423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent. 16771da177e4SLinus Torvalds */ 1678423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 16791da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 16803cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 16818c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 16828c7a2c2bSNeilBrown if (repl 16831aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags) 16848c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 16858c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 16868c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 16878c7a2c2bSNeilBrown /* replacement has just become active */ 16888c7a2c2bSNeilBrown if (!rdev || 16898c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 16908c7a2c2bSNeilBrown count++; 16918c7a2c2bSNeilBrown if (rdev) { 16928c7a2c2bSNeilBrown /* Replaced device not technically 16938c7a2c2bSNeilBrown * faulty, but we need to be sure 16948c7a2c2bSNeilBrown * it gets removed and never re-added 16958c7a2c2bSNeilBrown */ 16968c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 16978c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 16988c7a2c2bSNeilBrown rdev->sysfs_state); 16998c7a2c2bSNeilBrown } 17008c7a2c2bSNeilBrown } 1701ddac7c7eSNeilBrown if (rdev 170261e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector 1703ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1704c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 17056b965620SNeilBrown count++; 1706654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 17071da177e4SLinus Torvalds } 17081da177e4SLinus Torvalds } 17096b965620SNeilBrown mddev->degraded -= count; 17106b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 17111da177e4SLinus Torvalds 17121da177e4SLinus Torvalds print_conf(conf); 17136b965620SNeilBrown return count; 17141da177e4SLinus Torvalds } 17151da177e4SLinus Torvalds 1716fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 17171da177e4SLinus Torvalds { 1718e8096360SNeilBrown struct r1conf *conf = mddev->private; 1719199050eaSNeil Brown int err = -EEXIST; 172041158c7eSNeilBrown int mirror = 0; 17210eaf822cSJonathan Brassow struct raid1_info *p; 17226c2fce2eSNeil Brown int first = 0; 172330194636SNeilBrown int last = conf->raid_disks - 1; 17241da177e4SLinus Torvalds 17255389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 17265389042fSNeilBrown return -EBUSY; 17275389042fSNeilBrown 17281501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev)) 17291501efadSDan Williams return -ENXIO; 17301501efadSDan Williams 17316c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 17326c2fce2eSNeil Brown first = last = rdev->raid_disk; 17336c2fce2eSNeil Brown 173470bcecdbSGoldwyn Rodrigues /* 173570bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk 173670bcecdbSGoldwyn Rodrigues * if possible. 173770bcecdbSGoldwyn Rodrigues */ 173870bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 && 173970bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first && 174070bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL) 174170bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk; 174270bcecdbSGoldwyn Rodrigues 17437ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 17447ef449d1SNeilBrown p = conf->mirrors+mirror; 17457ef449d1SNeilBrown if (!p->rdev) { 17461da177e4SLinus Torvalds 17479092c02dSJonathan Brassow if (mddev->gendisk) 17488f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 17498f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 17501da177e4SLinus Torvalds 17511da177e4SLinus Torvalds p->head_position = 0; 17521da177e4SLinus Torvalds rdev->raid_disk = mirror; 1753199050eaSNeil Brown err = 0; 17546aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 17556aea114aSNeilBrown * if this was recently any drive of the array 17566aea114aSNeilBrown */ 17576aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 175841158c7eSNeilBrown conf->fullsync = 1; 1759d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 17601da177e4SLinus Torvalds break; 17611da177e4SLinus Torvalds } 17627ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 17637ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 17647ef449d1SNeilBrown /* Add this device as a replacement */ 17657ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 17667ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 17677ef449d1SNeilBrown rdev->raid_disk = mirror; 17687ef449d1SNeilBrown err = 0; 17697ef449d1SNeilBrown conf->fullsync = 1; 17707ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 17717ef449d1SNeilBrown break; 17727ef449d1SNeilBrown } 17737ef449d1SNeilBrown } 17749092c02dSJonathan Brassow if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) 17752ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, mddev->queue); 17761da177e4SLinus Torvalds print_conf(conf); 1777199050eaSNeil Brown return err; 17781da177e4SLinus Torvalds } 17791da177e4SLinus Torvalds 1780b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 17811da177e4SLinus Torvalds { 1782e8096360SNeilBrown struct r1conf *conf = mddev->private; 17831da177e4SLinus Torvalds int err = 0; 1784b8321b68SNeilBrown int number = rdev->raid_disk; 17850eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 17861da177e4SLinus Torvalds 1787b014f14cSNeilBrown if (rdev != p->rdev) 1788b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1789b014f14cSNeilBrown 17901da177e4SLinus Torvalds print_conf(conf); 1791b8321b68SNeilBrown if (rdev == p->rdev) { 1792b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 17931da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 17941da177e4SLinus Torvalds err = -EBUSY; 17951da177e4SLinus Torvalds goto abort; 17961da177e4SLinus Torvalds } 1797046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1798dfc70645SNeilBrown * is not possible. 1799dfc70645SNeilBrown */ 1800dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 18015389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1802dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1803dfc70645SNeilBrown err = -EBUSY; 1804dfc70645SNeilBrown goto abort; 1805dfc70645SNeilBrown } 18061da177e4SLinus Torvalds p->rdev = NULL; 1807d787be40SNeilBrown if (!test_bit(RemoveSynchronized, &rdev->flags)) { 1808fbd568a3SPaul E. McKenney synchronize_rcu(); 18091da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 18101da177e4SLinus Torvalds /* lost the race, try later */ 18111da177e4SLinus Torvalds err = -EBUSY; 18121da177e4SLinus Torvalds p->rdev = rdev; 1813ac5e7113SAndre Noll goto abort; 1814d787be40SNeilBrown } 1815d787be40SNeilBrown } 1816d787be40SNeilBrown if (conf->mirrors[conf->raid_disks + number].rdev) { 18178c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 18188c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 18198c7a2c2bSNeilBrown * doing this to avoid confusion. 18208c7a2c2bSNeilBrown */ 18218c7a2c2bSNeilBrown struct md_rdev *repl = 18228c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 1823e2d59925SNeilBrown freeze_array(conf, 0); 18248c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 18258c7a2c2bSNeilBrown p->rdev = repl; 18268c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 1827e2d59925SNeilBrown unfreeze_array(conf); 1828e5bc9c3cSGuoqing Jiang } 1829e5bc9c3cSGuoqing Jiang 18308c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1831a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 18321da177e4SLinus Torvalds } 18331da177e4SLinus Torvalds abort: 18341da177e4SLinus Torvalds 18351da177e4SLinus Torvalds print_conf(conf); 18361da177e4SLinus Torvalds return err; 18371da177e4SLinus Torvalds } 18381da177e4SLinus Torvalds 18394246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio) 18401da177e4SLinus Torvalds { 184198d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 18421da177e4SLinus Torvalds 18430fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1844ba3ae3beSNamhyung Kim 18451da177e4SLinus Torvalds /* 18461da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 18471da177e4SLinus Torvalds * or re-read if the read failed. 18481da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 18491da177e4SLinus Torvalds */ 18504e4cbee9SChristoph Hellwig if (!bio->bi_status) 18511da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1852d11c171eSNeilBrown 1853d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 18541da177e4SLinus Torvalds reschedule_retry(r1_bio); 18551da177e4SLinus Torvalds } 18561da177e4SLinus Torvalds 18574246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio) 18581da177e4SLinus Torvalds { 18594e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status; 186098d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 1861fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1862e8096360SNeilBrown struct r1conf *conf = mddev->private; 18634367af55SNeilBrown sector_t first_bad; 18644367af55SNeilBrown int bad_sectors; 1865854abd75SNeilBrown struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; 1866ba3ae3beSNamhyung Kim 18676b1117d5SNeilBrown if (!uptodate) { 186857dab0bdSNeilBrown sector_t sync_blocks = 0; 18696b1117d5SNeilBrown sector_t s = r1_bio->sector; 18706b1117d5SNeilBrown long sectors_to_go = r1_bio->sectors; 18716b1117d5SNeilBrown /* make sure these bits doesn't get cleared. */ 18726b1117d5SNeilBrown do { 18735e3db645SNeilBrown bitmap_end_sync(mddev->bitmap, s, 18746b1117d5SNeilBrown &sync_blocks, 1); 18756b1117d5SNeilBrown s += sync_blocks; 18766b1117d5SNeilBrown sectors_to_go -= sync_blocks; 18776b1117d5SNeilBrown } while (sectors_to_go > 0); 1878854abd75SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1879854abd75SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 188019d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 188119d67169SNeilBrown mddev->recovery); 1882d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 1883854abd75SNeilBrown } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 18843a9f28a5SNeilBrown &first_bad, &bad_sectors) && 18853a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 18863a9f28a5SNeilBrown r1_bio->sector, 18873a9f28a5SNeilBrown r1_bio->sectors, 18883a9f28a5SNeilBrown &first_bad, &bad_sectors) 18893a9f28a5SNeilBrown ) 18904367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1891e3b9703eSNeilBrown 18921da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 18934367af55SNeilBrown int s = r1_bio->sectors; 1894d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1895d8f05d29SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 18964367af55SNeilBrown reschedule_retry(r1_bio); 18974367af55SNeilBrown else { 18981da177e4SLinus Torvalds put_buf(r1_bio); 189973d5c38aSNeilBrown md_done_sync(mddev, s, uptodate); 19001da177e4SLinus Torvalds } 19011da177e4SLinus Torvalds } 19024367af55SNeilBrown } 19031da177e4SLinus Torvalds 19043cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1905d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1906d8f05d29SNeilBrown { 1907796a5cf0SMike Christie if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) 1908d8f05d29SNeilBrown /* success */ 1909d8f05d29SNeilBrown return 1; 191019d67169SNeilBrown if (rw == WRITE) { 1911d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 191219d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 191319d67169SNeilBrown &rdev->flags)) 191419d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 191519d67169SNeilBrown rdev->mddev->recovery); 191619d67169SNeilBrown } 1917d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1918d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1919d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1920d8f05d29SNeilBrown return 0; 1921d8f05d29SNeilBrown } 1922d8f05d29SNeilBrown 19239f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 19241da177e4SLinus Torvalds { 1925a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 192669382e85SNeilBrown * good data, much like with normal read errors. Only 1927ddac7c7eSNeilBrown * read into the pages we already have so we don't 192869382e85SNeilBrown * need to re-issue the read request. 192969382e85SNeilBrown * We don't need to freeze the array, because being in an 193069382e85SNeilBrown * active sync request, there is no normal IO, and 193169382e85SNeilBrown * no overlapping syncs. 193206f60385SNeilBrown * We don't need to check is_badblock() again as we 193306f60385SNeilBrown * made sure that anything with a bad block in range 193406f60385SNeilBrown * will have bi_end_io clear. 19351da177e4SLinus Torvalds */ 1936fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1937e8096360SNeilBrown struct r1conf *conf = mddev->private; 1938a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 193944cf0f4dSMing Lei struct page **pages = get_resync_pages(bio)->pages; 194069382e85SNeilBrown sector_t sect = r1_bio->sector; 194169382e85SNeilBrown int sectors = r1_bio->sectors; 194269382e85SNeilBrown int idx = 0; 19432e52d449SNeilBrown struct md_rdev *rdev; 19442e52d449SNeilBrown 19452e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 19462e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) { 19472e52d449SNeilBrown /* Don't try recovering from here - just fail it 19482e52d449SNeilBrown * ... unless it is the last working device of course */ 19492e52d449SNeilBrown md_error(mddev, rdev); 19502e52d449SNeilBrown if (test_bit(Faulty, &rdev->flags)) 19512e52d449SNeilBrown /* Don't try to read from here, but make sure 19522e52d449SNeilBrown * put_buf does it's thing 19532e52d449SNeilBrown */ 19542e52d449SNeilBrown bio->bi_end_io = end_sync_write; 19552e52d449SNeilBrown } 195669382e85SNeilBrown 195769382e85SNeilBrown while(sectors) { 195869382e85SNeilBrown int s = sectors; 195969382e85SNeilBrown int d = r1_bio->read_disk; 196069382e85SNeilBrown int success = 0; 196178d7f5f7SNeilBrown int start; 196269382e85SNeilBrown 196369382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 196469382e85SNeilBrown s = PAGE_SIZE >> 9; 196569382e85SNeilBrown do { 196669382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 1967ddac7c7eSNeilBrown /* No rcu protection needed here devices 1968ddac7c7eSNeilBrown * can only be removed when no resync is 1969ddac7c7eSNeilBrown * active, and resync is currently active 1970ddac7c7eSNeilBrown */ 197169382e85SNeilBrown rdev = conf->mirrors[d].rdev; 19729d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 197344cf0f4dSMing Lei pages[idx], 1974796a5cf0SMike Christie REQ_OP_READ, 0, false)) { 197569382e85SNeilBrown success = 1; 197669382e85SNeilBrown break; 197769382e85SNeilBrown } 197869382e85SNeilBrown } 197969382e85SNeilBrown d++; 19808f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 198169382e85SNeilBrown d = 0; 198269382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 198369382e85SNeilBrown 198478d7f5f7SNeilBrown if (!success) { 198578d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 19863a9f28a5SNeilBrown int abort = 0; 19873a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 19883a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 19893a9f28a5SNeilBrown * work just disable and interrupt the recovery. 19903a9f28a5SNeilBrown * Don't fail devices as that won't really help. 19913a9f28a5SNeilBrown */ 19921d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 199378d7f5f7SNeilBrown mdname(mddev), 199478d7f5f7SNeilBrown bdevname(bio->bi_bdev, b), 199578d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 19968f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 19973a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 19983a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 19993a9f28a5SNeilBrown continue; 20003a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 20013a9f28a5SNeilBrown abort = 1; 20023a9f28a5SNeilBrown } 20033a9f28a5SNeilBrown if (abort) { 2004d890fa2bSNeilBrown conf->recovery_disabled = 2005d890fa2bSNeilBrown mddev->recovery_disabled; 20063a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 200778d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 200878d7f5f7SNeilBrown put_buf(r1_bio); 200978d7f5f7SNeilBrown return 0; 201078d7f5f7SNeilBrown } 20113a9f28a5SNeilBrown /* Try next page */ 20123a9f28a5SNeilBrown sectors -= s; 20133a9f28a5SNeilBrown sect += s; 20143a9f28a5SNeilBrown idx++; 20153a9f28a5SNeilBrown continue; 20163a9f28a5SNeilBrown } 201778d7f5f7SNeilBrown 201878d7f5f7SNeilBrown start = d; 201969382e85SNeilBrown /* write it back and re-read */ 202069382e85SNeilBrown while (d != r1_bio->read_disk) { 202169382e85SNeilBrown if (d == 0) 20228f19ccb2SNeilBrown d = conf->raid_disks * 2; 202369382e85SNeilBrown d--; 202469382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 202569382e85SNeilBrown continue; 202669382e85SNeilBrown rdev = conf->mirrors[d].rdev; 2027d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 202844cf0f4dSMing Lei pages[idx], 2029d8f05d29SNeilBrown WRITE) == 0) { 203078d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 203178d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 20329d3d8011SNamhyung Kim } 2033097426f6SNeilBrown } 2034097426f6SNeilBrown d = start; 2035097426f6SNeilBrown while (d != r1_bio->read_disk) { 2036097426f6SNeilBrown if (d == 0) 20378f19ccb2SNeilBrown d = conf->raid_disks * 2; 2038097426f6SNeilBrown d--; 2039097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 2040097426f6SNeilBrown continue; 2041097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 2042d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 204344cf0f4dSMing Lei pages[idx], 2044d8f05d29SNeilBrown READ) != 0) 20459d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 204669382e85SNeilBrown } 204769382e85SNeilBrown sectors -= s; 204869382e85SNeilBrown sect += s; 204969382e85SNeilBrown idx ++; 205069382e85SNeilBrown } 205178d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 20524e4cbee9SChristoph Hellwig bio->bi_status = 0; 2053a68e5870SNeilBrown return 1; 205469382e85SNeilBrown } 2055d11c171eSNeilBrown 2056c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio) 2057a68e5870SNeilBrown { 2058a68e5870SNeilBrown /* We have read all readable devices. If we haven't 2059a68e5870SNeilBrown * got the block, then there is no hope left. 2060a68e5870SNeilBrown * If we have, then we want to do a comparison 2061a68e5870SNeilBrown * and skip the write if everything is the same. 2062a68e5870SNeilBrown * If any blocks failed to read, then we need to 2063a68e5870SNeilBrown * attempt an over-write 2064a68e5870SNeilBrown */ 2065fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2066e8096360SNeilBrown struct r1conf *conf = mddev->private; 2067a68e5870SNeilBrown int primary; 2068a68e5870SNeilBrown int i; 2069f4380a91Smajianpeng int vcnt; 2070a68e5870SNeilBrown 207130bc9b53SNeilBrown /* Fix variable parts of all bios */ 207230bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 207330bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 20744e4cbee9SChristoph Hellwig blk_status_t status; 207530bc9b53SNeilBrown struct bio *b = r1_bio->bios[i]; 207698d30c58SMing Lei struct resync_pages *rp = get_resync_pages(b); 207730bc9b53SNeilBrown if (b->bi_end_io != end_sync_read) 207830bc9b53SNeilBrown continue; 20794246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */ 20804e4cbee9SChristoph Hellwig status = b->bi_status; 208130bc9b53SNeilBrown bio_reset(b); 20824e4cbee9SChristoph Hellwig b->bi_status = status; 20834f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector + 208430bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset; 208530bc9b53SNeilBrown b->bi_bdev = conf->mirrors[i].rdev->bdev; 208630bc9b53SNeilBrown b->bi_end_io = end_sync_read; 208798d30c58SMing Lei rp->raid_bio = r1_bio; 208898d30c58SMing Lei b->bi_private = rp; 208930bc9b53SNeilBrown 2090fb0eb5dfSMing Lei /* initialize bvec table again */ 2091fb0eb5dfSMing Lei md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); 209230bc9b53SNeilBrown } 20938f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 2094a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 20954e4cbee9SChristoph Hellwig !r1_bio->bios[primary]->bi_status) { 2096a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 2097a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 2098a68e5870SNeilBrown break; 2099a68e5870SNeilBrown } 2100a68e5870SNeilBrown r1_bio->read_disk = primary; 21018f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2102a68e5870SNeilBrown int j; 2103a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 2104a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 21054e4cbee9SChristoph Hellwig blk_status_t status = sbio->bi_status; 210644cf0f4dSMing Lei struct page **ppages = get_resync_pages(pbio)->pages; 210744cf0f4dSMing Lei struct page **spages = get_resync_pages(sbio)->pages; 210860928a91SMing Lei struct bio_vec *bi; 21098fc04e6eSMing Lei int page_len[RESYNC_PAGES] = { 0 }; 211078d7f5f7SNeilBrown 21112aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read) 211278d7f5f7SNeilBrown continue; 21134246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */ 21144e4cbee9SChristoph Hellwig sbio->bi_status = 0; 2115a68e5870SNeilBrown 211660928a91SMing Lei bio_for_each_segment_all(bi, sbio, j) 211760928a91SMing Lei page_len[j] = bi->bv_len; 211860928a91SMing Lei 21194e4cbee9SChristoph Hellwig if (!status) { 2120a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 212144cf0f4dSMing Lei if (memcmp(page_address(ppages[j]), 212244cf0f4dSMing Lei page_address(spages[j]), 212360928a91SMing Lei page_len[j])) 2124a68e5870SNeilBrown break; 2125a68e5870SNeilBrown } 2126a68e5870SNeilBrown } else 2127a68e5870SNeilBrown j = 0; 2128a68e5870SNeilBrown if (j >= 0) 21297f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); 2130a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 21314e4cbee9SChristoph Hellwig && !status)) { 213278d7f5f7SNeilBrown /* No need to write to this device. */ 2133a68e5870SNeilBrown sbio->bi_end_io = NULL; 2134a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 213578d7f5f7SNeilBrown continue; 213678d7f5f7SNeilBrown } 2137d3b45c2aSKent Overstreet 2138d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio); 2139a68e5870SNeilBrown } 2140a68e5870SNeilBrown } 2141a68e5870SNeilBrown 21429f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 2143a68e5870SNeilBrown { 2144e8096360SNeilBrown struct r1conf *conf = mddev->private; 2145a68e5870SNeilBrown int i; 21468f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 2147037d2ff6SGuoqing Jiang struct bio *wbio; 2148a68e5870SNeilBrown 2149a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2150a68e5870SNeilBrown /* ouch - failed to read all of that. */ 2151a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 2152a68e5870SNeilBrown return; 21537ca78d57SNeilBrown 21547ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2155c95e6385SNeilBrown process_checks(r1_bio); 2156c95e6385SNeilBrown 2157d11c171eSNeilBrown /* 2158d11c171eSNeilBrown * schedule writes 2159d11c171eSNeilBrown */ 21601da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 21611da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 21621da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 21633e198f78SNeilBrown if (wbio->bi_end_io == NULL || 21643e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 21653e198f78SNeilBrown (i == r1_bio->read_disk || 21663e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 21671da177e4SLinus Torvalds continue; 21680c9d5b12SNeilBrown if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 21690c9d5b12SNeilBrown continue; 21701da177e4SLinus Torvalds 2171796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 2172212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) 2173212e7eb7SNeilBrown wbio->bi_opf |= MD_FAILFAST; 2174212e7eb7SNeilBrown 21753e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 21761da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 2177aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); 2178191ea9b2SNeilBrown 21791da177e4SLinus Torvalds generic_make_request(wbio); 21801da177e4SLinus Torvalds } 21811da177e4SLinus Torvalds 21821da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 2183191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 218458e94ae1SNeilBrown int s = r1_bio->sectors; 218558e94ae1SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 218658e94ae1SNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 218758e94ae1SNeilBrown reschedule_retry(r1_bio); 218858e94ae1SNeilBrown else { 21891da177e4SLinus Torvalds put_buf(r1_bio); 219058e94ae1SNeilBrown md_done_sync(mddev, s, 1); 219158e94ae1SNeilBrown } 21921da177e4SLinus Torvalds } 21931da177e4SLinus Torvalds } 21941da177e4SLinus Torvalds 21951da177e4SLinus Torvalds /* 21961da177e4SLinus Torvalds * This is a kernel thread which: 21971da177e4SLinus Torvalds * 21981da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 21991da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 2200d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 22011da177e4SLinus Torvalds */ 22021da177e4SLinus Torvalds 2203e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 2204867868fbSNeilBrown sector_t sect, int sectors) 2205867868fbSNeilBrown { 2206fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 2207867868fbSNeilBrown while(sectors) { 2208867868fbSNeilBrown int s = sectors; 2209867868fbSNeilBrown int d = read_disk; 2210867868fbSNeilBrown int success = 0; 2211867868fbSNeilBrown int start; 22123cb03002SNeilBrown struct md_rdev *rdev; 2213867868fbSNeilBrown 2214867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 2215867868fbSNeilBrown s = PAGE_SIZE >> 9; 2216867868fbSNeilBrown 2217867868fbSNeilBrown do { 2218d2eb35acSNeilBrown sector_t first_bad; 2219d2eb35acSNeilBrown int bad_sectors; 2220d2eb35acSNeilBrown 2221707a6a42SNeilBrown rcu_read_lock(); 2222707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2223867868fbSNeilBrown if (rdev && 2224da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 2225da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 2226da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 2227d2eb35acSNeilBrown is_badblock(rdev, sect, s, 2228707a6a42SNeilBrown &first_bad, &bad_sectors) == 0) { 2229707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2230707a6a42SNeilBrown rcu_read_unlock(); 2231707a6a42SNeilBrown if (sync_page_io(rdev, sect, s<<9, 2232796a5cf0SMike Christie conf->tmppage, REQ_OP_READ, 0, false)) 2233867868fbSNeilBrown success = 1; 2234707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2235707a6a42SNeilBrown if (success) 2236707a6a42SNeilBrown break; 2237707a6a42SNeilBrown } else 2238707a6a42SNeilBrown rcu_read_unlock(); 2239867868fbSNeilBrown d++; 22408f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 2241867868fbSNeilBrown d = 0; 2242867868fbSNeilBrown } while (!success && d != read_disk); 2243867868fbSNeilBrown 2244867868fbSNeilBrown if (!success) { 2245d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 22463cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 2247d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 2248d8f05d29SNeilBrown md_error(mddev, rdev); 2249867868fbSNeilBrown break; 2250867868fbSNeilBrown } 2251867868fbSNeilBrown /* write it back and re-read */ 2252867868fbSNeilBrown start = d; 2253867868fbSNeilBrown while (d != read_disk) { 2254867868fbSNeilBrown if (d==0) 22558f19ccb2SNeilBrown d = conf->raid_disks * 2; 2256867868fbSNeilBrown d--; 2257707a6a42SNeilBrown rcu_read_lock(); 2258707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2259867868fbSNeilBrown if (rdev && 2260707a6a42SNeilBrown !test_bit(Faulty, &rdev->flags)) { 2261707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2262707a6a42SNeilBrown rcu_read_unlock(); 2263d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 2264d8f05d29SNeilBrown conf->tmppage, WRITE); 2265707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2266707a6a42SNeilBrown } else 2267707a6a42SNeilBrown rcu_read_unlock(); 2268867868fbSNeilBrown } 2269867868fbSNeilBrown d = start; 2270867868fbSNeilBrown while (d != read_disk) { 2271867868fbSNeilBrown char b[BDEVNAME_SIZE]; 2272867868fbSNeilBrown if (d==0) 22738f19ccb2SNeilBrown d = conf->raid_disks * 2; 2274867868fbSNeilBrown d--; 2275707a6a42SNeilBrown rcu_read_lock(); 2276707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2277867868fbSNeilBrown if (rdev && 2278b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) { 2279707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2280707a6a42SNeilBrown rcu_read_unlock(); 2281d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 2282d8f05d29SNeilBrown conf->tmppage, READ)) { 2283867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 22841d41c216SNeilBrown pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", 2285867868fbSNeilBrown mdname(mddev), s, 2286969b755aSRandy Dunlap (unsigned long long)(sect + 2287969b755aSRandy Dunlap rdev->data_offset), 2288867868fbSNeilBrown bdevname(rdev->bdev, b)); 2289867868fbSNeilBrown } 2290707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2291707a6a42SNeilBrown } else 2292707a6a42SNeilBrown rcu_read_unlock(); 2293867868fbSNeilBrown } 2294867868fbSNeilBrown sectors -= s; 2295867868fbSNeilBrown sect += s; 2296867868fbSNeilBrown } 2297867868fbSNeilBrown } 2298867868fbSNeilBrown 22999f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2300cd5ff9a1SNeilBrown { 2301fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2302e8096360SNeilBrown struct r1conf *conf = mddev->private; 23033cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2304cd5ff9a1SNeilBrown 2305cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2306cd5ff9a1SNeilBrown * we just recently had a write error. 2307cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2308cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2309cd5ff9a1SNeilBrown * a bad block. 2310cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2311cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2312cd5ff9a1SNeilBrown * 2313cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2314cd5ff9a1SNeilBrown */ 2315cd5ff9a1SNeilBrown 2316cd5ff9a1SNeilBrown int block_sectors; 2317cd5ff9a1SNeilBrown sector_t sector; 2318cd5ff9a1SNeilBrown int sectors; 2319cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2320cd5ff9a1SNeilBrown int ok = 1; 2321cd5ff9a1SNeilBrown 2322cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2323cd5ff9a1SNeilBrown return 0; 2324cd5ff9a1SNeilBrown 2325ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift, 2326ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9); 2327cd5ff9a1SNeilBrown sector = r1_bio->sector; 2328cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2329cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2330cd5ff9a1SNeilBrown - sector; 2331cd5ff9a1SNeilBrown 2332cd5ff9a1SNeilBrown while (sect_to_write) { 2333cd5ff9a1SNeilBrown struct bio *wbio; 2334cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2335cd5ff9a1SNeilBrown sectors = sect_to_write; 2336cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2337cd5ff9a1SNeilBrown 2338b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2339841c1316SMing Lei wbio = bio_clone_fast(r1_bio->behind_master_bio, 2340841c1316SMing Lei GFP_NOIO, 2341841c1316SMing Lei mddev->bio_set); 2342b783863fSKent Overstreet } else { 2343d7a10308SMing Lei wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, 2344d7a10308SMing Lei mddev->bio_set); 2345b783863fSKent Overstreet } 2346b783863fSKent Overstreet 2347796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 23484f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector; 23494f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9; 2350cd5ff9a1SNeilBrown 23516678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors); 23524f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset; 2353cd5ff9a1SNeilBrown wbio->bi_bdev = rdev->bdev; 23544e49ea4aSMike Christie 23554e49ea4aSMike Christie if (submit_bio_wait(wbio) < 0) 2356cd5ff9a1SNeilBrown /* failure! */ 2357cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2358cd5ff9a1SNeilBrown sectors, 0) 2359cd5ff9a1SNeilBrown && ok; 2360cd5ff9a1SNeilBrown 2361cd5ff9a1SNeilBrown bio_put(wbio); 2362cd5ff9a1SNeilBrown sect_to_write -= sectors; 2363cd5ff9a1SNeilBrown sector += sectors; 2364cd5ff9a1SNeilBrown sectors = block_sectors; 2365cd5ff9a1SNeilBrown } 2366cd5ff9a1SNeilBrown return ok; 2367cd5ff9a1SNeilBrown } 2368cd5ff9a1SNeilBrown 2369e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 237062096bceSNeilBrown { 237162096bceSNeilBrown int m; 237262096bceSNeilBrown int s = r1_bio->sectors; 23738f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 23743cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 237562096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 237662096bceSNeilBrown if (bio->bi_end_io == NULL) 237762096bceSNeilBrown continue; 23784e4cbee9SChristoph Hellwig if (!bio->bi_status && 237962096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2380c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 238162096bceSNeilBrown } 23824e4cbee9SChristoph Hellwig if (bio->bi_status && 238362096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 238462096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 238562096bceSNeilBrown md_error(conf->mddev, rdev); 238662096bceSNeilBrown } 238762096bceSNeilBrown } 238862096bceSNeilBrown put_buf(r1_bio); 238962096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 239062096bceSNeilBrown } 239162096bceSNeilBrown 2392e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 239362096bceSNeilBrown { 2394fd76863eScolyli@suse.de int m, idx; 239555ce74d4SNeilBrown bool fail = false; 2396fd76863eScolyli@suse.de 23978f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 239862096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 23993cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 240062096bceSNeilBrown rdev_clear_badblocks(rdev, 240162096bceSNeilBrown r1_bio->sector, 2402c6563a8cSNeilBrown r1_bio->sectors, 0); 240362096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 240462096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 240562096bceSNeilBrown /* This drive got a write error. We need to 240662096bceSNeilBrown * narrow down and record precise write 240762096bceSNeilBrown * errors. 240862096bceSNeilBrown */ 240955ce74d4SNeilBrown fail = true; 241062096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 241162096bceSNeilBrown md_error(conf->mddev, 241262096bceSNeilBrown conf->mirrors[m].rdev); 241362096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 241462096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 241562096bceSNeilBrown } 241662096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 241762096bceSNeilBrown conf->mddev); 241862096bceSNeilBrown } 241955ce74d4SNeilBrown if (fail) { 242055ce74d4SNeilBrown spin_lock_irq(&conf->device_lock); 242155ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list); 2422fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2423824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 242455ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock); 2425824e47daScolyli@suse.de /* 2426824e47daScolyli@suse.de * In case freeze_array() is waiting for condition 2427824e47daScolyli@suse.de * get_unqueued_pending() == extra to be true. 2428824e47daScolyli@suse.de */ 2429824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 243055ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread); 2431bd8688a1SNeilBrown } else { 2432bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2433bd8688a1SNeilBrown close_write(r1_bio); 243462096bceSNeilBrown raid_end_bio_io(r1_bio); 243562096bceSNeilBrown } 2436bd8688a1SNeilBrown } 243762096bceSNeilBrown 2438e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 243962096bceSNeilBrown { 2440fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 244162096bceSNeilBrown struct bio *bio; 24423cb03002SNeilBrown struct md_rdev *rdev; 2443109e3765SNeilBrown dev_t bio_dev; 2444109e3765SNeilBrown sector_t bio_sector; 244562096bceSNeilBrown 244662096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 244762096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 244862096bceSNeilBrown * the block and we can fix it. 244962096bceSNeilBrown * We freeze all other IO, and try reading the block from 245062096bceSNeilBrown * other devices. When we find one, we re-write 245162096bceSNeilBrown * and check it that fixes the read error. 245262096bceSNeilBrown * This is all done synchronously while the array is 245362096bceSNeilBrown * frozen 245462096bceSNeilBrown */ 24557449f699STomasz Majchrzak 24567449f699STomasz Majchrzak bio = r1_bio->bios[r1_bio->read_disk]; 2457109e3765SNeilBrown bio_dev = bio->bi_bdev->bd_dev; 2458109e3765SNeilBrown bio_sector = conf->mirrors[r1_bio->read_disk].rdev->data_offset + r1_bio->sector; 24597449f699STomasz Majchrzak bio_put(bio); 24607449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = NULL; 24617449f699STomasz Majchrzak 24622e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 24632e52d449SNeilBrown if (mddev->ro == 0 24642e52d449SNeilBrown && !test_bit(FailFast, &rdev->flags)) { 2465e2d59925SNeilBrown freeze_array(conf, 1); 246662096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 246762096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 246862096bceSNeilBrown unfreeze_array(conf); 24697449f699STomasz Majchrzak } else { 24707449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; 24717449f699STomasz Majchrzak } 24727449f699STomasz Majchrzak 24732e52d449SNeilBrown rdev_dec_pending(rdev, conf->mddev); 2474689389a0SNeilBrown allow_barrier(conf, r1_bio->sector); 2475689389a0SNeilBrown bio = r1_bio->master_bio; 247662096bceSNeilBrown 2477689389a0SNeilBrown /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ 2478689389a0SNeilBrown r1_bio->state = 0; 2479689389a0SNeilBrown raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); 2480109e3765SNeilBrown } 248162096bceSNeilBrown 24824ed8731dSShaohua Li static void raid1d(struct md_thread *thread) 24831da177e4SLinus Torvalds { 24844ed8731dSShaohua Li struct mddev *mddev = thread->mddev; 24859f2c9d12SNeilBrown struct r1bio *r1_bio; 24861da177e4SLinus Torvalds unsigned long flags; 2487e8096360SNeilBrown struct r1conf *conf = mddev->private; 24881da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2489e1dfa0a2SNeilBrown struct blk_plug plug; 2490fd76863eScolyli@suse.de int idx; 24911da177e4SLinus Torvalds 24921da177e4SLinus Torvalds md_check_recovery(mddev); 24931da177e4SLinus Torvalds 249455ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) && 24952953079cSShaohua Li !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { 249655ce74d4SNeilBrown LIST_HEAD(tmp); 249755ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 2498fd76863eScolyli@suse.de if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 2499fd76863eScolyli@suse.de list_splice_init(&conf->bio_end_io_list, &tmp); 250055ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 250155ce74d4SNeilBrown while (!list_empty(&tmp)) { 2502a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio, 2503a452744bSMikulas Patocka retry_list); 250455ce74d4SNeilBrown list_del(&r1_bio->retry_list); 2505fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2506824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 2507bd8688a1SNeilBrown if (mddev->degraded) 2508bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 2509bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2510bd8688a1SNeilBrown close_write(r1_bio); 251155ce74d4SNeilBrown raid_end_bio_io(r1_bio); 251255ce74d4SNeilBrown } 251355ce74d4SNeilBrown } 251455ce74d4SNeilBrown 2515e1dfa0a2SNeilBrown blk_start_plug(&plug); 25161da177e4SLinus Torvalds for (;;) { 2517a35e63efSNeilBrown 25187eaceaccSJens Axboe flush_pending_writes(conf); 2519a35e63efSNeilBrown 25201da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2521a35e63efSNeilBrown if (list_empty(head)) { 2522191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 25231da177e4SLinus Torvalds break; 2524a35e63efSNeilBrown } 25259f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 25261da177e4SLinus Torvalds list_del(head->prev); 2527fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2528824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 25291da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 25301da177e4SLinus Torvalds 25311da177e4SLinus Torvalds mddev = r1_bio->mddev; 2532070ec55dSNeilBrown conf = mddev->private; 25334367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2534d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 253562096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 253662096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 253762096bceSNeilBrown else 25381da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2539cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 254062096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 254162096bceSNeilBrown handle_write_finished(conf, r1_bio); 254262096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 254362096bceSNeilBrown handle_read_error(conf, r1_bio); 2544d2eb35acSNeilBrown else 2545c230e7e5SNeilBrown WARN_ON_ONCE(1); 254662096bceSNeilBrown 25471d9d5241SNeilBrown cond_resched(); 25482953079cSShaohua Li if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) 2549de393cdeSNeilBrown md_check_recovery(mddev); 25501da177e4SLinus Torvalds } 2551e1dfa0a2SNeilBrown blk_finish_plug(&plug); 25521da177e4SLinus Torvalds } 25531da177e4SLinus Torvalds 2554e8096360SNeilBrown static int init_resync(struct r1conf *conf) 25551da177e4SLinus Torvalds { 25561da177e4SLinus Torvalds int buffs; 25571da177e4SLinus Torvalds 25581da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 25599e77c485SEric Sesterhenn BUG_ON(conf->r1buf_pool); 25601da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 25611da177e4SLinus Torvalds conf->poolinfo); 25621da177e4SLinus Torvalds if (!conf->r1buf_pool) 25631da177e4SLinus Torvalds return -ENOMEM; 25641da177e4SLinus Torvalds return 0; 25651da177e4SLinus Torvalds } 25661da177e4SLinus Torvalds 25671da177e4SLinus Torvalds /* 25681da177e4SLinus Torvalds * perform a "sync" on one "block" 25691da177e4SLinus Torvalds * 25701da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 25711da177e4SLinus Torvalds * requests - conflict with active sync requests. 25721da177e4SLinus Torvalds * 25731da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 25741da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 25751da177e4SLinus Torvalds */ 25761da177e4SLinus Torvalds 2577849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 2578849674e4SShaohua Li int *skipped) 25791da177e4SLinus Torvalds { 2580e8096360SNeilBrown struct r1conf *conf = mddev->private; 25819f2c9d12SNeilBrown struct r1bio *r1_bio; 25821da177e4SLinus Torvalds struct bio *bio; 25831da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 25843e198f78SNeilBrown int disk = -1; 25851da177e4SLinus Torvalds int i; 25863e198f78SNeilBrown int wonly = -1; 25873e198f78SNeilBrown int write_targets = 0, read_targets = 0; 258857dab0bdSNeilBrown sector_t sync_blocks; 2589e3b9703eSNeilBrown int still_degraded = 0; 259006f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 259106f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 2592fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 2593022e510fSMing Lei int page_idx = 0; 25941da177e4SLinus Torvalds 25951da177e4SLinus Torvalds if (!conf->r1buf_pool) 25961da177e4SLinus Torvalds if (init_resync(conf)) 259757afd89fSNeilBrown return 0; 25981da177e4SLinus Torvalds 259958c0fed4SAndre Noll max_sector = mddev->dev_sectors; 26001da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2601191ea9b2SNeilBrown /* If we aborted, we need to abort the 2602191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2603191ea9b2SNeilBrown * only be one in raid1 resync. 2604191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2605191ea9b2SNeilBrown */ 26066a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 26076a806c51SNeilBrown bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2608191ea9b2SNeilBrown &sync_blocks, 1); 26096a806c51SNeilBrown else /* completed sync */ 2610191ea9b2SNeilBrown conf->fullsync = 0; 26116a806c51SNeilBrown 26126a806c51SNeilBrown bitmap_close_sync(mddev->bitmap); 26131da177e4SLinus Torvalds close_sync(conf); 2614c40f341fSGoldwyn Rodrigues 2615c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) { 2616c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0; 2617c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0; 2618c40f341fSGoldwyn Rodrigues } 26191da177e4SLinus Torvalds return 0; 26201da177e4SLinus Torvalds } 26211da177e4SLinus Torvalds 262207d84d10SNeilBrown if (mddev->bitmap == NULL && 262307d84d10SNeilBrown mddev->recovery_cp == MaxSector && 26246394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 262507d84d10SNeilBrown conf->fullsync == 0) { 262607d84d10SNeilBrown *skipped = 1; 262707d84d10SNeilBrown return max_sector - sector_nr; 262807d84d10SNeilBrown } 26296394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 26306394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 26316394cca5SNeilBrown */ 2632e3b9703eSNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2633e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2634191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2635191ea9b2SNeilBrown *skipped = 1; 2636191ea9b2SNeilBrown return sync_blocks; 2637191ea9b2SNeilBrown } 263817999be4SNeilBrown 26397ac50447STomasz Majchrzak /* 26407ac50447STomasz Majchrzak * If there is non-resync activity waiting for a turn, then let it 26417ac50447STomasz Majchrzak * though before starting on this new sync request. 26427ac50447STomasz Majchrzak */ 2643824e47daScolyli@suse.de if (atomic_read(&conf->nr_waiting[idx])) 26447ac50447STomasz Majchrzak schedule_timeout_uninterruptible(1); 26457ac50447STomasz Majchrzak 2646c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against 2647c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS 2648c40f341fSGoldwyn Rodrigues */ 2649c40f341fSGoldwyn Rodrigues 2650c40f341fSGoldwyn Rodrigues bitmap_cond_end_sync(mddev->bitmap, sector_nr, 2651c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); 26521c4588e9SNeilBrown r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 265317999be4SNeilBrown 2654c2fd4c94SNeilBrown raise_barrier(conf, sector_nr); 26551da177e4SLinus Torvalds 26563e198f78SNeilBrown rcu_read_lock(); 26573e198f78SNeilBrown /* 26583e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 26593e198f78SNeilBrown * we might want to read from a different device. So we 26603e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 26613e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 26623e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 26633e198f78SNeilBrown * is OK. 26643e198f78SNeilBrown */ 26651da177e4SLinus Torvalds 26661da177e4SLinus Torvalds r1_bio->mddev = mddev; 26671da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2668191ea9b2SNeilBrown r1_bio->state = 0; 26691da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 2670fd76863eScolyli@suse.de /* make sure good_sectors won't go across barrier unit boundary */ 2671fd76863eScolyli@suse.de good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); 26721da177e4SLinus Torvalds 26738f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 26743cb03002SNeilBrown struct md_rdev *rdev; 26751da177e4SLinus Torvalds bio = r1_bio->bios[i]; 26761da177e4SLinus Torvalds 26773e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 26783e198f78SNeilBrown if (rdev == NULL || 26793e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 26808f19ccb2SNeilBrown if (i < conf->raid_disks) 2681e3b9703eSNeilBrown still_degraded = 1; 26823e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 2683796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 26841da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 26851da177e4SLinus Torvalds write_targets ++; 26863e198f78SNeilBrown } else { 26873e198f78SNeilBrown /* may need to read from here */ 268806f60385SNeilBrown sector_t first_bad = MaxSector; 268906f60385SNeilBrown int bad_sectors; 269006f60385SNeilBrown 269106f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 269206f60385SNeilBrown &first_bad, &bad_sectors)) { 269306f60385SNeilBrown if (first_bad > sector_nr) 269406f60385SNeilBrown good_sectors = first_bad - sector_nr; 269506f60385SNeilBrown else { 269606f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 269706f60385SNeilBrown if (min_bad == 0 || 269806f60385SNeilBrown min_bad > bad_sectors) 269906f60385SNeilBrown min_bad = bad_sectors; 270006f60385SNeilBrown } 270106f60385SNeilBrown } 270206f60385SNeilBrown if (sector_nr < first_bad) { 27033e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 27043e198f78SNeilBrown if (wonly < 0) 27053e198f78SNeilBrown wonly = i; 27063e198f78SNeilBrown } else { 27073e198f78SNeilBrown if (disk < 0) 27083e198f78SNeilBrown disk = i; 27093e198f78SNeilBrown } 2710796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, 0); 271106f60385SNeilBrown bio->bi_end_io = end_sync_read; 27123e198f78SNeilBrown read_targets++; 2713d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) && 2714d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 2715d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 2716d57368afSAlexander Lyakas /* 2717d57368afSAlexander Lyakas * The device is suitable for reading (InSync), 2718d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them, 2719d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave 2720d57368afSAlexander Lyakas * this device alone for this sync request. 2721d57368afSAlexander Lyakas */ 2722796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 2723d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write; 2724d57368afSAlexander Lyakas write_targets++; 27253e198f78SNeilBrown } 272606f60385SNeilBrown } 272706f60385SNeilBrown if (bio->bi_end_io) { 27283e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 27294f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; 27303e198f78SNeilBrown bio->bi_bdev = rdev->bdev; 27312e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) 27322e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 27331da177e4SLinus Torvalds } 273406f60385SNeilBrown } 27353e198f78SNeilBrown rcu_read_unlock(); 27363e198f78SNeilBrown if (disk < 0) 27373e198f78SNeilBrown disk = wonly; 27383e198f78SNeilBrown r1_bio->read_disk = disk; 2739191ea9b2SNeilBrown 274006f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 274106f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 274206f60385SNeilBrown * need to mark them bad on all write targets 274306f60385SNeilBrown */ 274406f60385SNeilBrown int ok = 1; 27458f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 274606f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2747a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 274806f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 274906f60385SNeilBrown min_bad, 0 275006f60385SNeilBrown ) && ok; 275106f60385SNeilBrown } 27522953079cSShaohua Li set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 275306f60385SNeilBrown *skipped = 1; 275406f60385SNeilBrown put_buf(r1_bio); 275506f60385SNeilBrown 275606f60385SNeilBrown if (!ok) { 275706f60385SNeilBrown /* Cannot record the badblocks, so need to 275806f60385SNeilBrown * abort the resync. 275906f60385SNeilBrown * If there are multiple read targets, could just 276006f60385SNeilBrown * fail the really bad ones ??? 276106f60385SNeilBrown */ 276206f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 276306f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 276406f60385SNeilBrown return 0; 276506f60385SNeilBrown } else 276606f60385SNeilBrown return min_bad; 276706f60385SNeilBrown 276806f60385SNeilBrown } 276906f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 277006f60385SNeilBrown /* only resync enough to reach the next bad->good 277106f60385SNeilBrown * transition */ 277206f60385SNeilBrown good_sectors = min_bad; 277306f60385SNeilBrown } 277406f60385SNeilBrown 27753e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 27763e198f78SNeilBrown /* extra read targets are also write targets */ 27773e198f78SNeilBrown write_targets += read_targets-1; 27783e198f78SNeilBrown 27793e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 27801da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 27811da177e4SLinus Torvalds * drives must be failed - so we are finished 27821da177e4SLinus Torvalds */ 2783b7219ccbSNeilBrown sector_t rv; 2784b7219ccbSNeilBrown if (min_bad > 0) 2785b7219ccbSNeilBrown max_sector = sector_nr + min_bad; 2786b7219ccbSNeilBrown rv = max_sector - sector_nr; 278757afd89fSNeilBrown *skipped = 1; 27881da177e4SLinus Torvalds put_buf(r1_bio); 27891da177e4SLinus Torvalds return rv; 27901da177e4SLinus Torvalds } 27911da177e4SLinus Torvalds 2792c6207277SNeilBrown if (max_sector > mddev->resync_max) 2793c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 279406f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 279506f60385SNeilBrown max_sector = sector_nr + good_sectors; 27961da177e4SLinus Torvalds nr_sectors = 0; 2797289e99e8SNeilBrown sync_blocks = 0; 27981da177e4SLinus Torvalds do { 27991da177e4SLinus Torvalds struct page *page; 28001da177e4SLinus Torvalds int len = PAGE_SIZE; 28011da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 28021da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 28031da177e4SLinus Torvalds if (len == 0) 28041da177e4SLinus Torvalds break; 2805ab7a30c7SNeilBrown if (sync_blocks == 0) { 28066a806c51SNeilBrown if (!bitmap_start_sync(mddev->bitmap, sector_nr, 2807e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2808e5de485fSNeilBrown !conf->fullsync && 2809e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2810191ea9b2SNeilBrown break; 28117571ae88SNeilBrown if ((len >> 9) > sync_blocks) 28126a806c51SNeilBrown len = sync_blocks<<9; 2813ab7a30c7SNeilBrown } 2814191ea9b2SNeilBrown 28158f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 281698d30c58SMing Lei struct resync_pages *rp; 281798d30c58SMing Lei 28181da177e4SLinus Torvalds bio = r1_bio->bios[i]; 281998d30c58SMing Lei rp = get_resync_pages(bio); 28201da177e4SLinus Torvalds if (bio->bi_end_io) { 2821022e510fSMing Lei page = resync_fetch_page(rp, page_idx); 2822c85ba149SMing Lei 2823c85ba149SMing Lei /* 2824c85ba149SMing Lei * won't fail because the vec table is big 2825c85ba149SMing Lei * enough to hold all these pages 2826c85ba149SMing Lei */ 2827c85ba149SMing Lei bio_add_page(bio, page, len, 0); 28281da177e4SLinus Torvalds } 28291da177e4SLinus Torvalds } 28301da177e4SLinus Torvalds nr_sectors += len>>9; 28311da177e4SLinus Torvalds sector_nr += len>>9; 2832191ea9b2SNeilBrown sync_blocks -= (len>>9); 2833022e510fSMing Lei } while (++page_idx < RESYNC_PAGES); 283498d30c58SMing Lei 28351da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 28361da177e4SLinus Torvalds 2837c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) && 2838c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) { 2839c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed; 2840c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; 2841c40f341fSGoldwyn Rodrigues /* Send resync message */ 2842c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev, 2843c40f341fSGoldwyn Rodrigues conf->cluster_sync_low, 2844c40f341fSGoldwyn Rodrigues conf->cluster_sync_high); 2845c40f341fSGoldwyn Rodrigues } 2846c40f341fSGoldwyn Rodrigues 2847d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2848d11c171eSNeilBrown * compare 2849d11c171eSNeilBrown */ 2850d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2851d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 28522d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2853d11c171eSNeilBrown bio = r1_bio->bios[i]; 2854d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 28552d4f4f33SNeilBrown read_targets--; 2856ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 28572e52d449SNeilBrown if (read_targets == 1) 28582e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 28591da177e4SLinus Torvalds generic_make_request(bio); 2860d11c171eSNeilBrown } 2861d11c171eSNeilBrown } 2862d11c171eSNeilBrown } else { 2863d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2864d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 2865ddac7c7eSNeilBrown md_sync_acct(bio->bi_bdev, nr_sectors); 28662e52d449SNeilBrown if (read_targets == 1) 28672e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2868d11c171eSNeilBrown generic_make_request(bio); 2869d11c171eSNeilBrown 2870d11c171eSNeilBrown } 28711da177e4SLinus Torvalds return nr_sectors; 28721da177e4SLinus Torvalds } 28731da177e4SLinus Torvalds 2874fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 287580c3a6ceSDan Williams { 287680c3a6ceSDan Williams if (sectors) 287780c3a6ceSDan Williams return sectors; 287880c3a6ceSDan Williams 287980c3a6ceSDan Williams return mddev->dev_sectors; 288080c3a6ceSDan Williams } 288180c3a6ceSDan Williams 2882e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 28831da177e4SLinus Torvalds { 2884e8096360SNeilBrown struct r1conf *conf; 2885709ae487SNeilBrown int i; 28860eaf822cSJonathan Brassow struct raid1_info *disk; 28873cb03002SNeilBrown struct md_rdev *rdev; 2888709ae487SNeilBrown int err = -ENOMEM; 28891da177e4SLinus Torvalds 2890e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 28911da177e4SLinus Torvalds if (!conf) 2892709ae487SNeilBrown goto abort; 28931da177e4SLinus Torvalds 2894fd76863eScolyli@suse.de conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, 2895824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2896fd76863eScolyli@suse.de if (!conf->nr_pending) 2897fd76863eScolyli@suse.de goto abort; 2898fd76863eScolyli@suse.de 2899fd76863eScolyli@suse.de conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, 2900824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2901fd76863eScolyli@suse.de if (!conf->nr_waiting) 2902fd76863eScolyli@suse.de goto abort; 2903fd76863eScolyli@suse.de 2904fd76863eScolyli@suse.de conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, 2905824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2906fd76863eScolyli@suse.de if (!conf->nr_queued) 2907fd76863eScolyli@suse.de goto abort; 2908fd76863eScolyli@suse.de 2909fd76863eScolyli@suse.de conf->barrier = kcalloc(BARRIER_BUCKETS_NR, 2910824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2911fd76863eScolyli@suse.de if (!conf->barrier) 2912fd76863eScolyli@suse.de goto abort; 2913fd76863eScolyli@suse.de 29140eaf822cSJonathan Brassow conf->mirrors = kzalloc(sizeof(struct raid1_info) 29158f19ccb2SNeilBrown * mddev->raid_disks * 2, 29161da177e4SLinus Torvalds GFP_KERNEL); 29171da177e4SLinus Torvalds if (!conf->mirrors) 2918709ae487SNeilBrown goto abort; 29191da177e4SLinus Torvalds 2920ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2921ddaf22abSNeilBrown if (!conf->tmppage) 2922709ae487SNeilBrown goto abort; 2923ddaf22abSNeilBrown 2924709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 29251da177e4SLinus Torvalds if (!conf->poolinfo) 2926709ae487SNeilBrown goto abort; 29278f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 29281da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 29291da177e4SLinus Torvalds r1bio_pool_free, 29301da177e4SLinus Torvalds conf->poolinfo); 29311da177e4SLinus Torvalds if (!conf->r1bio_pool) 2932709ae487SNeilBrown goto abort; 2933709ae487SNeilBrown 2934011067b0SNeilBrown conf->bio_split = bioset_create(BIO_POOL_SIZE, 0, 0); 2935c230e7e5SNeilBrown if (!conf->bio_split) 2936c230e7e5SNeilBrown goto abort; 2937c230e7e5SNeilBrown 2938ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 29391da177e4SLinus Torvalds 2940c19d5798SNeilBrown err = -EINVAL; 2941e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 2942dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 2943709ae487SNeilBrown int disk_idx = rdev->raid_disk; 29441da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 29451da177e4SLinus Torvalds || disk_idx < 0) 29461da177e4SLinus Torvalds continue; 2947c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 294802b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx; 2949c19d5798SNeilBrown else 29501da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 29511da177e4SLinus Torvalds 2952c19d5798SNeilBrown if (disk->rdev) 2953c19d5798SNeilBrown goto abort; 29541da177e4SLinus Torvalds disk->rdev = rdev; 29551da177e4SLinus Torvalds disk->head_position = 0; 295612cee5a8SShaohua Li disk->seq_start = MaxSector; 29571da177e4SLinus Torvalds } 29581da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 29591da177e4SLinus Torvalds conf->mddev = mddev; 29601da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 296155ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list); 29621da177e4SLinus Torvalds 29631da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 296417999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 29651da177e4SLinus Torvalds 2966191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 296734db0cd6SNeilBrown conf->pending_count = 0; 2968d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 2969191ea9b2SNeilBrown 2970c19d5798SNeilBrown err = -EIO; 29718f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 29721da177e4SLinus Torvalds 29731da177e4SLinus Torvalds disk = conf->mirrors + i; 29741da177e4SLinus Torvalds 2975c19d5798SNeilBrown if (i < conf->raid_disks && 2976c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 2977c19d5798SNeilBrown /* This slot has a replacement. */ 2978c19d5798SNeilBrown if (!disk->rdev) { 2979c19d5798SNeilBrown /* No original, just make the replacement 2980c19d5798SNeilBrown * a recovering spare 2981c19d5798SNeilBrown */ 2982c19d5798SNeilBrown disk->rdev = 2983c19d5798SNeilBrown disk[conf->raid_disks].rdev; 2984c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 2985c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 2986c19d5798SNeilBrown /* Original is not in_sync - bad */ 2987c19d5798SNeilBrown goto abort; 2988c19d5798SNeilBrown } 2989c19d5798SNeilBrown 29905fd6c1dcSNeilBrown if (!disk->rdev || 29915fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 29921da177e4SLinus Torvalds disk->head_position = 0; 29934f0a5e01SJonathan Brassow if (disk->rdev && 29944f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 299517571284SNeilBrown conf->fullsync = 1; 2996be4d3280SShaohua Li } 29971da177e4SLinus Torvalds } 2998709ae487SNeilBrown 2999709ae487SNeilBrown err = -ENOMEM; 30000232605dSNeilBrown conf->thread = md_register_thread(raid1d, mddev, "raid1"); 30011d41c216SNeilBrown if (!conf->thread) 3002709ae487SNeilBrown goto abort; 3003191ea9b2SNeilBrown 3004709ae487SNeilBrown return conf; 3005709ae487SNeilBrown 3006709ae487SNeilBrown abort: 3007709ae487SNeilBrown if (conf) { 3008709ae487SNeilBrown mempool_destroy(conf->r1bio_pool); 3009709ae487SNeilBrown kfree(conf->mirrors); 3010709ae487SNeilBrown safe_put_page(conf->tmppage); 3011709ae487SNeilBrown kfree(conf->poolinfo); 3012fd76863eScolyli@suse.de kfree(conf->nr_pending); 3013fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3014fd76863eScolyli@suse.de kfree(conf->nr_queued); 3015fd76863eScolyli@suse.de kfree(conf->barrier); 3016c230e7e5SNeilBrown if (conf->bio_split) 3017c230e7e5SNeilBrown bioset_free(conf->bio_split); 3018709ae487SNeilBrown kfree(conf); 3019709ae487SNeilBrown } 3020709ae487SNeilBrown return ERR_PTR(err); 3021709ae487SNeilBrown } 3022709ae487SNeilBrown 3023afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv); 3024849674e4SShaohua Li static int raid1_run(struct mddev *mddev) 3025709ae487SNeilBrown { 3026e8096360SNeilBrown struct r1conf *conf; 3027709ae487SNeilBrown int i; 30283cb03002SNeilBrown struct md_rdev *rdev; 30295220ea1eSmajianpeng int ret; 30302ff8cc2cSShaohua Li bool discard_supported = false; 3031709ae487SNeilBrown 3032709ae487SNeilBrown if (mddev->level != 1) { 30331d41c216SNeilBrown pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", 3034709ae487SNeilBrown mdname(mddev), mddev->level); 3035709ae487SNeilBrown return -EIO; 3036709ae487SNeilBrown } 3037709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 30381d41c216SNeilBrown pr_warn("md/raid1:%s: reshape_position set but not supported\n", 3039709ae487SNeilBrown mdname(mddev)); 3040709ae487SNeilBrown return -EIO; 3041709ae487SNeilBrown } 3042a415c0f1SNeilBrown if (mddev_init_writes_pending(mddev) < 0) 3043a415c0f1SNeilBrown return -ENOMEM; 3044709ae487SNeilBrown /* 3045709ae487SNeilBrown * copy the already verified devices into our private RAID1 3046709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 3047afa0f557SNeilBrown * should be freed in raid1_free()] 3048709ae487SNeilBrown */ 3049709ae487SNeilBrown if (mddev->private == NULL) 3050709ae487SNeilBrown conf = setup_conf(mddev); 3051709ae487SNeilBrown else 3052709ae487SNeilBrown conf = mddev->private; 3053709ae487SNeilBrown 3054709ae487SNeilBrown if (IS_ERR(conf)) 3055709ae487SNeilBrown return PTR_ERR(conf); 3056709ae487SNeilBrown 30573deff1a7SChristoph Hellwig if (mddev->queue) { 30585026d7a9SH. Peter Anvin blk_queue_max_write_same_sectors(mddev->queue, 0); 30593deff1a7SChristoph Hellwig blk_queue_max_write_zeroes_sectors(mddev->queue, 0); 30603deff1a7SChristoph Hellwig } 30615026d7a9SH. Peter Anvin 3062dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 30631ed7242eSJonathan Brassow if (!mddev->gendisk) 30641ed7242eSJonathan Brassow continue; 3065709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 3066709ae487SNeilBrown rdev->data_offset << 9); 30672ff8cc2cSShaohua Li if (blk_queue_discard(bdev_get_queue(rdev->bdev))) 30682ff8cc2cSShaohua Li discard_supported = true; 3069709ae487SNeilBrown } 3070709ae487SNeilBrown 3071709ae487SNeilBrown mddev->degraded = 0; 3072709ae487SNeilBrown for (i=0; i < conf->raid_disks; i++) 3073709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 3074709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 3075709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 3076709ae487SNeilBrown mddev->degraded++; 3077709ae487SNeilBrown 3078709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 3079709ae487SNeilBrown mddev->recovery_cp = MaxSector; 3080709ae487SNeilBrown 30818c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 30821d41c216SNeilBrown pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", 30838c6ac868SAndre Noll mdname(mddev)); 30841d41c216SNeilBrown pr_info("md/raid1:%s: active with %d out of %d mirrors\n", 30851da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 30861da177e4SLinus Torvalds mddev->raid_disks); 3087709ae487SNeilBrown 30881da177e4SLinus Torvalds /* 30891da177e4SLinus Torvalds * Ok, everything is just fine now 30901da177e4SLinus Torvalds */ 3091709ae487SNeilBrown mddev->thread = conf->thread; 3092709ae487SNeilBrown conf->thread = NULL; 3093709ae487SNeilBrown mddev->private = conf; 309446533ff7SNeilBrown set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); 3095709ae487SNeilBrown 30961f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 30971da177e4SLinus Torvalds 30981ed7242eSJonathan Brassow if (mddev->queue) { 30992ff8cc2cSShaohua Li if (discard_supported) 31002ff8cc2cSShaohua Li queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, 31012ff8cc2cSShaohua Li mddev->queue); 31022ff8cc2cSShaohua Li else 31032ff8cc2cSShaohua Li queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, 31042ff8cc2cSShaohua Li mddev->queue); 31051ed7242eSJonathan Brassow } 31065220ea1eSmajianpeng 31075220ea1eSmajianpeng ret = md_integrity_register(mddev); 31085aa61f42SNeilBrown if (ret) { 31095aa61f42SNeilBrown md_unregister_thread(&mddev->thread); 3110afa0f557SNeilBrown raid1_free(mddev, conf); 31115aa61f42SNeilBrown } 31125220ea1eSmajianpeng return ret; 31131da177e4SLinus Torvalds } 31141da177e4SLinus Torvalds 3115afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv) 31161da177e4SLinus Torvalds { 3117afa0f557SNeilBrown struct r1conf *conf = priv; 31184b6d287fSNeilBrown 31191da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 31201da177e4SLinus Torvalds kfree(conf->mirrors); 31210fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage); 31221da177e4SLinus Torvalds kfree(conf->poolinfo); 3123fd76863eScolyli@suse.de kfree(conf->nr_pending); 3124fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3125fd76863eScolyli@suse.de kfree(conf->nr_queued); 3126fd76863eScolyli@suse.de kfree(conf->barrier); 3127c230e7e5SNeilBrown if (conf->bio_split) 3128c230e7e5SNeilBrown bioset_free(conf->bio_split); 31291da177e4SLinus Torvalds kfree(conf); 31301da177e4SLinus Torvalds } 31311da177e4SLinus Torvalds 3132fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 31331da177e4SLinus Torvalds { 31341da177e4SLinus Torvalds /* no resync is happening, and there is enough space 31351da177e4SLinus Torvalds * on all devices, so we can resize. 31361da177e4SLinus Torvalds * We need to make sure resync covers any new space. 31371da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 31381da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 31391da177e4SLinus Torvalds * worth it. 31401da177e4SLinus Torvalds */ 3141a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 3142a4a6125aSNeilBrown if (mddev->external_size && 3143a4a6125aSNeilBrown mddev->array_sectors > newsize) 3144b522adcdSDan Williams return -EINVAL; 3145a4a6125aSNeilBrown if (mddev->bitmap) { 3146a4a6125aSNeilBrown int ret = bitmap_resize(mddev->bitmap, newsize, 0, 0); 3147a4a6125aSNeilBrown if (ret) 3148a4a6125aSNeilBrown return ret; 3149a4a6125aSNeilBrown } 3150a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 3151b522adcdSDan Williams if (sectors > mddev->dev_sectors && 3152b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 315358c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 31541da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 31551da177e4SLinus Torvalds } 3156b522adcdSDan Williams mddev->dev_sectors = sectors; 31574b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 31581da177e4SLinus Torvalds return 0; 31591da177e4SLinus Torvalds } 31601da177e4SLinus Torvalds 3161fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 31621da177e4SLinus Torvalds { 31631da177e4SLinus Torvalds /* We need to: 31641da177e4SLinus Torvalds * 1/ resize the r1bio_pool 31651da177e4SLinus Torvalds * 2/ resize conf->mirrors 31661da177e4SLinus Torvalds * 31671da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 31681da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 31691da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 31706ea9c07cSNeilBrown * 31716ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 31726ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 31731da177e4SLinus Torvalds */ 31741da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 31751da177e4SLinus Torvalds struct pool_info *newpoolinfo; 31760eaf822cSJonathan Brassow struct raid1_info *newmirrors; 3177e8096360SNeilBrown struct r1conf *conf = mddev->private; 317863c70c4fSNeilBrown int cnt, raid_disks; 3179c04be0aaSNeilBrown unsigned long flags; 31802214c260SArtur Paszkiewicz int d, d2; 31811da177e4SLinus Torvalds 318263c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 3183664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 318463c70c4fSNeilBrown mddev->layout != mddev->new_layout || 318563c70c4fSNeilBrown mddev->level != mddev->new_level) { 3186664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 318763c70c4fSNeilBrown mddev->new_layout = mddev->layout; 318863c70c4fSNeilBrown mddev->new_level = mddev->level; 318963c70c4fSNeilBrown return -EINVAL; 319063c70c4fSNeilBrown } 319163c70c4fSNeilBrown 31922214c260SArtur Paszkiewicz if (!mddev_is_clustered(mddev)) 31932214c260SArtur Paszkiewicz md_allow_write(mddev); 31942a2275d6SNeilBrown 319563c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 319663c70c4fSNeilBrown 31976ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 31986ea9c07cSNeilBrown cnt=0; 31996ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 32001da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 32016ea9c07cSNeilBrown cnt++; 32026ea9c07cSNeilBrown if (cnt > raid_disks) 32031da177e4SLinus Torvalds return -EBUSY; 32046ea9c07cSNeilBrown } 32051da177e4SLinus Torvalds 32061da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 32071da177e4SLinus Torvalds if (!newpoolinfo) 32081da177e4SLinus Torvalds return -ENOMEM; 32091da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 32108f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 32111da177e4SLinus Torvalds 32121da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 32131da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 32141da177e4SLinus Torvalds if (!newpool) { 32151da177e4SLinus Torvalds kfree(newpoolinfo); 32161da177e4SLinus Torvalds return -ENOMEM; 32171da177e4SLinus Torvalds } 32180eaf822cSJonathan Brassow newmirrors = kzalloc(sizeof(struct raid1_info) * raid_disks * 2, 32198f19ccb2SNeilBrown GFP_KERNEL); 32201da177e4SLinus Torvalds if (!newmirrors) { 32211da177e4SLinus Torvalds kfree(newpoolinfo); 32221da177e4SLinus Torvalds mempool_destroy(newpool); 32231da177e4SLinus Torvalds return -ENOMEM; 32241da177e4SLinus Torvalds } 32251da177e4SLinus Torvalds 3226e2d59925SNeilBrown freeze_array(conf, 0); 32271da177e4SLinus Torvalds 32281da177e4SLinus Torvalds /* ok, everything is stopped */ 32291da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 32301da177e4SLinus Torvalds conf->r1bio_pool = newpool; 32316ea9c07cSNeilBrown 3232a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 32333cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 3234a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 323536fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 3236a88aa786SNeilBrown rdev->raid_disk = d2; 323736fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 323836fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 32391d41c216SNeilBrown pr_warn("md/raid1:%s: cannot register rd%d\n", 324036fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 3241a88aa786SNeilBrown } 3242a88aa786SNeilBrown if (rdev) 3243a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 32446ea9c07cSNeilBrown } 32451da177e4SLinus Torvalds kfree(conf->mirrors); 32461da177e4SLinus Torvalds conf->mirrors = newmirrors; 32471da177e4SLinus Torvalds kfree(conf->poolinfo); 32481da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 32491da177e4SLinus Torvalds 3250c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 32511da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 3252c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 32531da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 325463c70c4fSNeilBrown mddev->delta_disks = 0; 32551da177e4SLinus Torvalds 3256e2d59925SNeilBrown unfreeze_array(conf); 32571da177e4SLinus Torvalds 3258985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 32591da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 32601da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 32611da177e4SLinus Torvalds 32621da177e4SLinus Torvalds mempool_destroy(oldpool); 32631da177e4SLinus Torvalds return 0; 32641da177e4SLinus Torvalds } 32651da177e4SLinus Torvalds 3266fd01b88cSNeilBrown static void raid1_quiesce(struct mddev *mddev, int state) 326736fa3063SNeilBrown { 3268e8096360SNeilBrown struct r1conf *conf = mddev->private; 326936fa3063SNeilBrown 327036fa3063SNeilBrown switch(state) { 32716eef4b21SNeilBrown case 2: /* wake for suspend */ 32726eef4b21SNeilBrown wake_up(&conf->wait_barrier); 32736eef4b21SNeilBrown break; 32749e6603daSNeilBrown case 1: 327507169fd4Smajianpeng freeze_array(conf, 0); 327636fa3063SNeilBrown break; 32779e6603daSNeilBrown case 0: 327807169fd4Smajianpeng unfreeze_array(conf); 327936fa3063SNeilBrown break; 328036fa3063SNeilBrown } 328136fa3063SNeilBrown } 328236fa3063SNeilBrown 3283fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 3284709ae487SNeilBrown { 3285709ae487SNeilBrown /* raid1 can take over: 3286709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 3287709ae487SNeilBrown */ 3288709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 3289e8096360SNeilBrown struct r1conf *conf; 3290709ae487SNeilBrown mddev->new_level = 1; 3291709ae487SNeilBrown mddev->new_layout = 0; 3292709ae487SNeilBrown mddev->new_chunk_sectors = 0; 3293709ae487SNeilBrown conf = setup_conf(mddev); 32946995f0b2SShaohua Li if (!IS_ERR(conf)) { 329507169fd4Smajianpeng /* Array must appear to be quiesced */ 329607169fd4Smajianpeng conf->array_frozen = 1; 3297394ed8e4SShaohua Li mddev_clear_unsupported_flags(mddev, 3298394ed8e4SShaohua Li UNSUPPORTED_MDDEV_FLAGS); 32996995f0b2SShaohua Li } 3300709ae487SNeilBrown return conf; 3301709ae487SNeilBrown } 3302709ae487SNeilBrown return ERR_PTR(-EINVAL); 3303709ae487SNeilBrown } 33041da177e4SLinus Torvalds 330584fc4b56SNeilBrown static struct md_personality raid1_personality = 33061da177e4SLinus Torvalds { 33071da177e4SLinus Torvalds .name = "raid1", 33082604b703SNeilBrown .level = 1, 33091da177e4SLinus Torvalds .owner = THIS_MODULE, 3310849674e4SShaohua Li .make_request = raid1_make_request, 3311849674e4SShaohua Li .run = raid1_run, 3312afa0f557SNeilBrown .free = raid1_free, 3313849674e4SShaohua Li .status = raid1_status, 3314849674e4SShaohua Li .error_handler = raid1_error, 33151da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 33161da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 33171da177e4SLinus Torvalds .spare_active = raid1_spare_active, 3318849674e4SShaohua Li .sync_request = raid1_sync_request, 33191da177e4SLinus Torvalds .resize = raid1_resize, 332080c3a6ceSDan Williams .size = raid1_size, 332163c70c4fSNeilBrown .check_reshape = raid1_reshape, 332236fa3063SNeilBrown .quiesce = raid1_quiesce, 3323709ae487SNeilBrown .takeover = raid1_takeover, 33245c675f83SNeilBrown .congested = raid1_congested, 33251da177e4SLinus Torvalds }; 33261da177e4SLinus Torvalds 33271da177e4SLinus Torvalds static int __init raid_init(void) 33281da177e4SLinus Torvalds { 33292604b703SNeilBrown return register_md_personality(&raid1_personality); 33301da177e4SLinus Torvalds } 33311da177e4SLinus Torvalds 33321da177e4SLinus Torvalds static void raid_exit(void) 33331da177e4SLinus Torvalds { 33342604b703SNeilBrown unregister_md_personality(&raid1_personality); 33351da177e4SLinus Torvalds } 33361da177e4SLinus Torvalds 33371da177e4SLinus Torvalds module_init(raid_init); 33381da177e4SLinus Torvalds module_exit(raid_exit); 33391da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 33400efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 33411da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3342d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 33432604b703SNeilBrown MODULE_ALIAS("md-level-1"); 334434db0cd6SNeilBrown 334534db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 3346