1af1a8899SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * raid1.c : Multiple Devices driver for Linux 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * RAID-1 management functions. 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 121da177e4SLinus Torvalds * 1396de0e25SJan Engelhardt * Fixes to reconstruction by Jakob Østergaard" <jakob@ostenfeld.dk> 141da177e4SLinus Torvalds * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> 151da177e4SLinus Torvalds * 16191ea9b2SNeilBrown * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support 17191ea9b2SNeilBrown * bitmapped intelligence in resync: 18191ea9b2SNeilBrown * 19191ea9b2SNeilBrown * - bitmap marked during normal i/o 20191ea9b2SNeilBrown * - bitmap used to skip nondirty blocks during sync 21191ea9b2SNeilBrown * 22191ea9b2SNeilBrown * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: 23191ea9b2SNeilBrown * - persistent bitmap code 241da177e4SLinus Torvalds */ 251da177e4SLinus Torvalds 265a0e3ad6STejun Heo #include <linux/slab.h> 2725570727SStephen Rothwell #include <linux/delay.h> 28bff61975SNeilBrown #include <linux/blkdev.h> 29056075c7SPaul Gortmaker #include <linux/module.h> 30bff61975SNeilBrown #include <linux/seq_file.h> 318bda470eSChristian Dietrich #include <linux/ratelimit.h> 3269b00b5bSGuoqing Jiang #include <linux/interval_tree_generic.h> 333f07c014SIngo Molnar 34109e3765SNeilBrown #include <trace/events/block.h> 353f07c014SIngo Molnar 3643b2e5d8SNeilBrown #include "md.h" 37ef740c37SChristoph Hellwig #include "raid1.h" 38935fe098SMike Snitzer #include "md-bitmap.h" 39191ea9b2SNeilBrown 40394ed8e4SShaohua Li #define UNSUPPORTED_MDDEV_FLAGS \ 41394ed8e4SShaohua Li ((1L << MD_HAS_JOURNAL) | \ 42ea0213e0SArtur Paszkiewicz (1L << MD_JOURNAL_CLEAN) | \ 43ddc08823SPawel Baldysiak (1L << MD_HAS_PPL) | \ 44ddc08823SPawel Baldysiak (1L << MD_HAS_MULTIPLE_PPLS)) 45394ed8e4SShaohua Li 46fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr); 47fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr); 481da177e4SLinus Torvalds 49578b54adSNeilBrown #define raid1_log(md, fmt, args...) \ 50578b54adSNeilBrown do { if ((md)->queue) blk_add_trace_msg((md)->queue, "raid1 " fmt, ##args); } while (0) 51578b54adSNeilBrown 52fb0eb5dfSMing Lei #include "raid1-10.c" 53fb0eb5dfSMing Lei 5469b00b5bSGuoqing Jiang #define START(node) ((node)->start) 5569b00b5bSGuoqing Jiang #define LAST(node) ((node)->last) 5669b00b5bSGuoqing Jiang INTERVAL_TREE_DEFINE(struct serial_info, node, sector_t, _subtree_last, 5769b00b5bSGuoqing Jiang START, LAST, static inline, raid1_rb); 5869b00b5bSGuoqing Jiang 59d0d2d8baSGuoqing Jiang static int check_and_add_serial(struct md_rdev *rdev, struct r1bio *r1_bio, 60d0d2d8baSGuoqing Jiang struct serial_info *si, int idx) 613e148a32SGuoqing Jiang { 623e148a32SGuoqing Jiang unsigned long flags; 633e148a32SGuoqing Jiang int ret = 0; 64d0d2d8baSGuoqing Jiang sector_t lo = r1_bio->sector; 65d0d2d8baSGuoqing Jiang sector_t hi = lo + r1_bio->sectors; 66025471f9SGuoqing Jiang struct serial_in_rdev *serial = &rdev->serial[idx]; 673e148a32SGuoqing Jiang 6869b00b5bSGuoqing Jiang spin_lock_irqsave(&serial->serial_lock, flags); 693e148a32SGuoqing Jiang /* collision happened */ 7069b00b5bSGuoqing Jiang if (raid1_rb_iter_first(&serial->serial_rb, lo, hi)) 713e148a32SGuoqing Jiang ret = -EBUSY; 72d0d2d8baSGuoqing Jiang else { 7369b00b5bSGuoqing Jiang si->start = lo; 7469b00b5bSGuoqing Jiang si->last = hi; 7569b00b5bSGuoqing Jiang raid1_rb_insert(si, &serial->serial_rb); 76d0d2d8baSGuoqing Jiang } 7769b00b5bSGuoqing Jiang spin_unlock_irqrestore(&serial->serial_lock, flags); 783e148a32SGuoqing Jiang 793e148a32SGuoqing Jiang return ret; 803e148a32SGuoqing Jiang } 813e148a32SGuoqing Jiang 82d0d2d8baSGuoqing Jiang static void wait_for_serialization(struct md_rdev *rdev, struct r1bio *r1_bio) 83d0d2d8baSGuoqing Jiang { 84d0d2d8baSGuoqing Jiang struct mddev *mddev = rdev->mddev; 85d0d2d8baSGuoqing Jiang struct serial_info *si; 86d0d2d8baSGuoqing Jiang int idx = sector_to_idx(r1_bio->sector); 87d0d2d8baSGuoqing Jiang struct serial_in_rdev *serial = &rdev->serial[idx]; 88d0d2d8baSGuoqing Jiang 89d0d2d8baSGuoqing Jiang if (WARN_ON(!mddev->serial_info_pool)) 90d0d2d8baSGuoqing Jiang return; 91d0d2d8baSGuoqing Jiang si = mempool_alloc(mddev->serial_info_pool, GFP_NOIO); 92d0d2d8baSGuoqing Jiang wait_event(serial->serial_io_wait, 93d0d2d8baSGuoqing Jiang check_and_add_serial(rdev, r1_bio, si, idx) == 0); 94d0d2d8baSGuoqing Jiang } 95d0d2d8baSGuoqing Jiang 96404659cfSGuoqing Jiang static void remove_serial(struct md_rdev *rdev, sector_t lo, sector_t hi) 973e148a32SGuoqing Jiang { 9869b00b5bSGuoqing Jiang struct serial_info *si; 993e148a32SGuoqing Jiang unsigned long flags; 1003e148a32SGuoqing Jiang int found = 0; 1013e148a32SGuoqing Jiang struct mddev *mddev = rdev->mddev; 102025471f9SGuoqing Jiang int idx = sector_to_idx(lo); 103025471f9SGuoqing Jiang struct serial_in_rdev *serial = &rdev->serial[idx]; 1043e148a32SGuoqing Jiang 10569b00b5bSGuoqing Jiang spin_lock_irqsave(&serial->serial_lock, flags); 10669b00b5bSGuoqing Jiang for (si = raid1_rb_iter_first(&serial->serial_rb, lo, hi); 10769b00b5bSGuoqing Jiang si; si = raid1_rb_iter_next(si, lo, hi)) { 10869b00b5bSGuoqing Jiang if (si->start == lo && si->last == hi) { 10969b00b5bSGuoqing Jiang raid1_rb_remove(si, &serial->serial_rb); 11069b00b5bSGuoqing Jiang mempool_free(si, mddev->serial_info_pool); 1113e148a32SGuoqing Jiang found = 1; 1123e148a32SGuoqing Jiang break; 1133e148a32SGuoqing Jiang } 11469b00b5bSGuoqing Jiang } 1153e148a32SGuoqing Jiang if (!found) 116404659cfSGuoqing Jiang WARN(1, "The write IO is not recorded for serialization\n"); 11769b00b5bSGuoqing Jiang spin_unlock_irqrestore(&serial->serial_lock, flags); 11869b00b5bSGuoqing Jiang wake_up(&serial->serial_io_wait); 1193e148a32SGuoqing Jiang } 1203e148a32SGuoqing Jiang 12198d30c58SMing Lei /* 12298d30c58SMing Lei * for resync bio, r1bio pointer can be retrieved from the per-bio 12398d30c58SMing Lei * 'struct resync_pages'. 12498d30c58SMing Lei */ 12598d30c58SMing Lei static inline struct r1bio *get_resync_r1bio(struct bio *bio) 12698d30c58SMing Lei { 12798d30c58SMing Lei return get_resync_pages(bio)->raid_bio; 12898d30c58SMing Lei } 12998d30c58SMing Lei 130dd0fc66fSAl Viro static void * r1bio_pool_alloc(gfp_t gfp_flags, void *data) 1311da177e4SLinus Torvalds { 1321da177e4SLinus Torvalds struct pool_info *pi = data; 1339f2c9d12SNeilBrown int size = offsetof(struct r1bio, bios[pi->raid_disks]); 1341da177e4SLinus Torvalds 1351da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 1367eaceaccSJens Axboe return kzalloc(size, gfp_flags); 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1398e005f7cSmajianpeng #define RESYNC_DEPTH 32 1401da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 1418e005f7cSmajianpeng #define RESYNC_WINDOW (RESYNC_BLOCK_SIZE * RESYNC_DEPTH) 1428e005f7cSmajianpeng #define RESYNC_WINDOW_SECTORS (RESYNC_WINDOW >> 9) 143c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW (16 * RESYNC_WINDOW) 144c40f341fSGoldwyn Rodrigues #define CLUSTER_RESYNC_WINDOW_SECTORS (CLUSTER_RESYNC_WINDOW >> 9) 1451da177e4SLinus Torvalds 146dd0fc66fSAl Viro static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) 1471da177e4SLinus Torvalds { 1481da177e4SLinus Torvalds struct pool_info *pi = data; 1499f2c9d12SNeilBrown struct r1bio *r1_bio; 1501da177e4SLinus Torvalds struct bio *bio; 151da1aab3dSNeilBrown int need_pages; 15298d30c58SMing Lei int j; 15398d30c58SMing Lei struct resync_pages *rps; 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 1567eaceaccSJens Axboe if (!r1_bio) 1571da177e4SLinus Torvalds return NULL; 1581da177e4SLinus Torvalds 1596da2ec56SKees Cook rps = kmalloc_array(pi->raid_disks, sizeof(struct resync_pages), 16098d30c58SMing Lei gfp_flags); 16198d30c58SMing Lei if (!rps) 16298d30c58SMing Lei goto out_free_r1bio; 16398d30c58SMing Lei 1641da177e4SLinus Torvalds /* 1651da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 1661da177e4SLinus Torvalds */ 1671da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 1686746557fSNeilBrown bio = bio_kmalloc(gfp_flags, RESYNC_PAGES); 1691da177e4SLinus Torvalds if (!bio) 1701da177e4SLinus Torvalds goto out_free_bio; 1711da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds /* 1741da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 175d11c171eSNeilBrown * the first bio. 176d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 177d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1781da177e4SLinus Torvalds */ 179d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 180da1aab3dSNeilBrown need_pages = pi->raid_disks; 181d11c171eSNeilBrown else 182da1aab3dSNeilBrown need_pages = 1; 18398d30c58SMing Lei for (j = 0; j < pi->raid_disks; j++) { 18498d30c58SMing Lei struct resync_pages *rp = &rps[j]; 1851da177e4SLinus Torvalds 18698d30c58SMing Lei bio = r1_bio->bios[j]; 18798d30c58SMing Lei 18898d30c58SMing Lei if (j < need_pages) { 18998d30c58SMing Lei if (resync_alloc_pages(rp, gfp_flags)) 190da1aab3dSNeilBrown goto out_free_pages; 19198d30c58SMing Lei } else { 19298d30c58SMing Lei memcpy(rp, &rps[0], sizeof(*rp)); 19398d30c58SMing Lei resync_get_all_pages(rp); 194d11c171eSNeilBrown } 19598d30c58SMing Lei 19698d30c58SMing Lei rp->raid_bio = r1_bio; 19798d30c58SMing Lei bio->bi_private = rp; 198d11c171eSNeilBrown } 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds r1_bio->master_bio = NULL; 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds return r1_bio; 2031da177e4SLinus Torvalds 204da1aab3dSNeilBrown out_free_pages: 205491221f8SGuoqing Jiang while (--j >= 0) 20698d30c58SMing Lei resync_free_pages(&rps[j]); 207da1aab3dSNeilBrown 2081da177e4SLinus Torvalds out_free_bio: 2091da177e4SLinus Torvalds while (++j < pi->raid_disks) 2101da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 21198d30c58SMing Lei kfree(rps); 21298d30c58SMing Lei 21398d30c58SMing Lei out_free_r1bio: 214c7afa803SMarcos Paulo de Souza rbio_pool_free(r1_bio, data); 2151da177e4SLinus Torvalds return NULL; 2161da177e4SLinus Torvalds } 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 2191da177e4SLinus Torvalds { 2201da177e4SLinus Torvalds struct pool_info *pi = data; 22198d30c58SMing Lei int i; 2229f2c9d12SNeilBrown struct r1bio *r1bio = __r1_bio; 22398d30c58SMing Lei struct resync_pages *rp = NULL; 2241da177e4SLinus Torvalds 22598d30c58SMing Lei for (i = pi->raid_disks; i--; ) { 22698d30c58SMing Lei rp = get_resync_pages(r1bio->bios[i]); 22798d30c58SMing Lei resync_free_pages(rp); 2281da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 22998d30c58SMing Lei } 23098d30c58SMing Lei 23198d30c58SMing Lei /* resync pages array stored in the 1st bio's .bi_private */ 23298d30c58SMing Lei kfree(rp); 2331da177e4SLinus Torvalds 234c7afa803SMarcos Paulo de Souza rbio_pool_free(r1bio, data); 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 237e8096360SNeilBrown static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) 2381da177e4SLinus Torvalds { 2391da177e4SLinus Torvalds int i; 2401da177e4SLinus Torvalds 2418f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2421da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 2434367af55SNeilBrown if (!BIO_SPECIAL(*bio)) 2441da177e4SLinus Torvalds bio_put(*bio); 2451da177e4SLinus Torvalds *bio = NULL; 2461da177e4SLinus Torvalds } 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds 2499f2c9d12SNeilBrown static void free_r1bio(struct r1bio *r1_bio) 2501da177e4SLinus Torvalds { 251e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 254afeee514SKent Overstreet mempool_free(r1_bio, &conf->r1bio_pool); 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds 2579f2c9d12SNeilBrown static void put_buf(struct r1bio *r1_bio) 2581da177e4SLinus Torvalds { 259e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 260af5f42a7SShaohua Li sector_t sect = r1_bio->sector; 2613e198f78SNeilBrown int i; 2623e198f78SNeilBrown 2638f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2643e198f78SNeilBrown struct bio *bio = r1_bio->bios[i]; 2653e198f78SNeilBrown if (bio->bi_end_io) 2663e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); 2673e198f78SNeilBrown } 2681da177e4SLinus Torvalds 269afeee514SKent Overstreet mempool_free(r1_bio, &conf->r1buf_pool); 2701da177e4SLinus Torvalds 271af5f42a7SShaohua Li lower_barrier(conf, sect); 2721da177e4SLinus Torvalds } 2731da177e4SLinus Torvalds 2749f2c9d12SNeilBrown static void reschedule_retry(struct r1bio *r1_bio) 2751da177e4SLinus Torvalds { 2761da177e4SLinus Torvalds unsigned long flags; 277fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 278e8096360SNeilBrown struct r1conf *conf = mddev->private; 279fd76863eScolyli@suse.de int idx; 2801da177e4SLinus Torvalds 281fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2821da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2831da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 284824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 2851da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 2861da177e4SLinus Torvalds 28717999be4SNeilBrown wake_up(&conf->wait_barrier); 2881da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds /* 2921da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored 2931da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer 2941da177e4SLinus Torvalds * cache layer. 2951da177e4SLinus Torvalds */ 2969f2c9d12SNeilBrown static void call_bio_endio(struct r1bio *r1_bio) 297d2eb35acSNeilBrown { 298d2eb35acSNeilBrown struct bio *bio = r1_bio->master_bio; 299d2eb35acSNeilBrown 300d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 3014e4cbee9SChristoph Hellwig bio->bi_status = BLK_STS_IOERR; 3024246a0b6SChristoph Hellwig 303a0159832SGuoqing Jiang if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) 304a0159832SGuoqing Jiang bio_end_io_acct(bio, r1_bio->start_time); 3054246a0b6SChristoph Hellwig bio_endio(bio); 306d2eb35acSNeilBrown } 307d2eb35acSNeilBrown 3089f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 3091da177e4SLinus Torvalds { 3101da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 311c91114c2SDavid Jeffery struct r1conf *conf = r1_bio->mddev->private; 3121da177e4SLinus Torvalds 3134b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 3144b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 31536a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 3164b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 3174f024f37SKent Overstreet (unsigned long long) bio->bi_iter.bi_sector, 3184f024f37SKent Overstreet (unsigned long long) bio_end_sector(bio) - 1); 3194b6d287fSNeilBrown 320d2eb35acSNeilBrown call_bio_endio(r1_bio); 3214b6d287fSNeilBrown } 322c91114c2SDavid Jeffery /* 323c91114c2SDavid Jeffery * Wake up any possible resync thread that waits for the device 324c91114c2SDavid Jeffery * to go idle. All I/Os, even write-behind writes, are done. 325c91114c2SDavid Jeffery */ 326c91114c2SDavid Jeffery allow_barrier(conf, r1_bio->sector); 327c91114c2SDavid Jeffery 3281da177e4SLinus Torvalds free_r1bio(r1_bio); 3291da177e4SLinus Torvalds } 3301da177e4SLinus Torvalds 3311da177e4SLinus Torvalds /* 3321da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 3331da177e4SLinus Torvalds */ 3349f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 3351da177e4SLinus Torvalds { 336e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds conf->mirrors[disk].head_position = 3391da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 342ba3ae3beSNamhyung Kim /* 343ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 344ba3ae3beSNamhyung Kim */ 3459f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 346ba3ae3beSNamhyung Kim { 347ba3ae3beSNamhyung Kim int mirror; 34830194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 34930194636SNeilBrown int raid_disks = conf->raid_disks; 350ba3ae3beSNamhyung Kim 3518f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 352ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 353ba3ae3beSNamhyung Kim break; 354ba3ae3beSNamhyung Kim 3558f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 356ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 357ba3ae3beSNamhyung Kim 358ba3ae3beSNamhyung Kim return mirror; 359ba3ae3beSNamhyung Kim } 360ba3ae3beSNamhyung Kim 3614246a0b6SChristoph Hellwig static void raid1_end_read_request(struct bio *bio) 3621da177e4SLinus Torvalds { 3634e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status; 3649f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 365e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 366e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds /* 3691da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3701da177e4SLinus Torvalds */ 371e5872d58SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 372ddaf22abSNeilBrown 373220946c9SNeilBrown if (uptodate) 3741da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3752e52d449SNeilBrown else if (test_bit(FailFast, &rdev->flags) && 3762e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 3772e52d449SNeilBrown /* This was a fail-fast read so we definitely 3782e52d449SNeilBrown * want to retry */ 3792e52d449SNeilBrown ; 380dd00a99eSNeilBrown else { 381dd00a99eSNeilBrown /* If all other devices have failed, we want to return 382dd00a99eSNeilBrown * the error upwards rather than fail the last device. 383dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 384dd00a99eSNeilBrown */ 385dd00a99eSNeilBrown unsigned long flags; 386dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 387dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 388dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 389e5872d58SNeilBrown test_bit(In_sync, &rdev->flags))) 390dd00a99eSNeilBrown uptodate = 1; 391dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 392dd00a99eSNeilBrown } 3931da177e4SLinus Torvalds 3947ad4d4a6SNeilBrown if (uptodate) { 3951da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 396e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 3977ad4d4a6SNeilBrown } else { 3981da177e4SLinus Torvalds /* 3991da177e4SLinus Torvalds * oops, read error: 4001da177e4SLinus Torvalds */ 4011da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 4021d41c216SNeilBrown pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", 4039dd1e2faSNeilBrown mdname(conf->mddev), 4041d41c216SNeilBrown bdevname(rdev->bdev, b), 4058bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 406d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 4071da177e4SLinus Torvalds reschedule_retry(r1_bio); 4087ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */ 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds 4129f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 4134e78064fSNeilBrown { 4144e78064fSNeilBrown /* it really is the end of this request */ 4154e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 416841c1316SMing Lei bio_free_pages(r1_bio->behind_master_bio); 417841c1316SMing Lei bio_put(r1_bio->behind_master_bio); 418841c1316SMing Lei r1_bio->behind_master_bio = NULL; 4194e78064fSNeilBrown } 4204e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 421e64e4018SAndy Shevchenko md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 4224e78064fSNeilBrown r1_bio->sectors, 4234e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 424af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 4254e78064fSNeilBrown md_write_end(r1_bio->mddev); 426cd5ff9a1SNeilBrown } 427cd5ff9a1SNeilBrown 4289f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 429cd5ff9a1SNeilBrown { 430cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 431cd5ff9a1SNeilBrown return; 432cd5ff9a1SNeilBrown 433cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 434cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 435cd5ff9a1SNeilBrown else { 436cd5ff9a1SNeilBrown close_write(r1_bio); 4374367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 4384367af55SNeilBrown reschedule_retry(r1_bio); 4394367af55SNeilBrown else 4404e78064fSNeilBrown raid_end_bio_io(r1_bio); 4414e78064fSNeilBrown } 4424e78064fSNeilBrown } 4434e78064fSNeilBrown 4444246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio) 4451da177e4SLinus Torvalds { 4469f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 447e5872d58SNeilBrown int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 448e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 44904b857f7SNeilBrown struct bio *to_put = NULL; 450e5872d58SNeilBrown int mirror = find_bio_disk(r1_bio, bio); 451e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[mirror].rdev; 452e3f948cdSShaohua Li bool discard_error; 45369df9cfcSGuoqing Jiang sector_t lo = r1_bio->sector; 45469df9cfcSGuoqing Jiang sector_t hi = r1_bio->sector + r1_bio->sectors; 455e3f948cdSShaohua Li 4564e4cbee9SChristoph Hellwig discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds /* 459e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4601da177e4SLinus Torvalds */ 4614e4cbee9SChristoph Hellwig if (bio->bi_status && !discard_error) { 462e5872d58SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 463e5872d58SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 46419d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 46519d67169SNeilBrown conf->mddev->recovery); 46619d67169SNeilBrown 467212e7eb7SNeilBrown if (test_bit(FailFast, &rdev->flags) && 468212e7eb7SNeilBrown (bio->bi_opf & MD_FAILFAST) && 469212e7eb7SNeilBrown /* We never try FailFast to WriteMostly devices */ 470212e7eb7SNeilBrown !test_bit(WriteMostly, &rdev->flags)) { 471212e7eb7SNeilBrown md_error(r1_bio->mddev, rdev); 472eeba6809SYufen Yu } 473eeba6809SYufen Yu 474eeba6809SYufen Yu /* 475eeba6809SYufen Yu * When the device is faulty, it is not necessary to 476eeba6809SYufen Yu * handle write error. 477eeba6809SYufen Yu * For failfast, this is the only remaining device, 478eeba6809SYufen Yu * We need to retry the write without FailFast. 479212e7eb7SNeilBrown */ 480eeba6809SYufen Yu if (!test_bit(Faulty, &rdev->flags)) 481212e7eb7SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 482212e7eb7SNeilBrown else { 4832417b986SPaul Clements /* Fail the request */ 4842417b986SPaul Clements set_bit(R1BIO_Degraded, &r1_bio->state); 485212e7eb7SNeilBrown /* Finished with this branch */ 486212e7eb7SNeilBrown r1_bio->bios[mirror] = NULL; 487212e7eb7SNeilBrown to_put = bio; 488212e7eb7SNeilBrown } 4894367af55SNeilBrown } else { 4901da177e4SLinus Torvalds /* 491e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 492e9c7469bSTejun Heo * will return a good error code for to the higher 493e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 494e9c7469bSTejun Heo * fails. 4951da177e4SLinus Torvalds * 496e9c7469bSTejun Heo * The 'master' represents the composite IO operation 497e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 498e9c7469bSTejun Heo * will wait for the 'master' bio. 4991da177e4SLinus Torvalds */ 5004367af55SNeilBrown sector_t first_bad; 5014367af55SNeilBrown int bad_sectors; 5024367af55SNeilBrown 503cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 504cd5ff9a1SNeilBrown to_put = bio; 5053056e3aeSAlex Lyakas /* 5063056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is 5073056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use 5083056e3aeSAlex Lyakas * such device for properly reading the data back (we could 5093056e3aeSAlex Lyakas * potentially use it, if the current write would have felt 5103056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't 5113056e3aeSAlex Lyakas * check this here. 5123056e3aeSAlex Lyakas */ 513e5872d58SNeilBrown if (test_bit(In_sync, &rdev->flags) && 514e5872d58SNeilBrown !test_bit(Faulty, &rdev->flags)) 5151da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 5161da177e4SLinus Torvalds 5174367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 518e5872d58SNeilBrown if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 519e3f948cdSShaohua Li &first_bad, &bad_sectors) && !discard_error) { 5204367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 5214367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 5224367af55SNeilBrown } 5234367af55SNeilBrown } 5244367af55SNeilBrown 5254b6d287fSNeilBrown if (behind) { 52669df9cfcSGuoqing Jiang if (test_bit(CollisionCheck, &rdev->flags)) 527404659cfSGuoqing Jiang remove_serial(rdev, lo, hi); 528e5872d58SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) 5294b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 5304b6d287fSNeilBrown 531e9c7469bSTejun Heo /* 532e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 533e9c7469bSTejun Heo * has safely reached all non-writemostly 534e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 535e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 536e9c7469bSTejun Heo * -EIO here, instead we'll wait 537e9c7469bSTejun Heo */ 5384b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 5394b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 5404b6d287fSNeilBrown /* Maybe we can return now */ 5414b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 5424b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 54336a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 54436a4e1feSNeilBrown " %llu-%llu\n", 5454f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector, 5464f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1); 547d2eb35acSNeilBrown call_bio_endio(r1_bio); 5484b6d287fSNeilBrown } 5494b6d287fSNeilBrown } 55069df9cfcSGuoqing Jiang } else if (rdev->mddev->serialize_policy) 55169df9cfcSGuoqing Jiang remove_serial(rdev, lo, hi); 5524367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 553e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 554e9c7469bSTejun Heo 5551da177e4SLinus Torvalds /* 5561da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 5571da177e4SLinus Torvalds * already. 5581da177e4SLinus Torvalds */ 559af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 560c70810b3SNeilBrown 56104b857f7SNeilBrown if (to_put) 56204b857f7SNeilBrown bio_put(to_put); 5631da177e4SLinus Torvalds } 5641da177e4SLinus Torvalds 565fd76863eScolyli@suse.de static sector_t align_to_barrier_unit_end(sector_t start_sector, 566fd76863eScolyli@suse.de sector_t sectors) 567fd76863eScolyli@suse.de { 568fd76863eScolyli@suse.de sector_t len; 569fd76863eScolyli@suse.de 570fd76863eScolyli@suse.de WARN_ON(sectors == 0); 571fd76863eScolyli@suse.de /* 572fd76863eScolyli@suse.de * len is the number of sectors from start_sector to end of the 573fd76863eScolyli@suse.de * barrier unit which start_sector belongs to. 574fd76863eScolyli@suse.de */ 575fd76863eScolyli@suse.de len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - 576fd76863eScolyli@suse.de start_sector; 577fd76863eScolyli@suse.de 578fd76863eScolyli@suse.de if (len > sectors) 579fd76863eScolyli@suse.de len = sectors; 580fd76863eScolyli@suse.de 581fd76863eScolyli@suse.de return len; 582fd76863eScolyli@suse.de } 583fd76863eScolyli@suse.de 5841da177e4SLinus Torvalds /* 5851da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 5861da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 5871da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 5881da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 5891da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 5901da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 5911da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 5921da177e4SLinus Torvalds * 5931da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 5941da177e4SLinus Torvalds * because position is mirror, not device based. 5951da177e4SLinus Torvalds * 5961da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 5971da177e4SLinus Torvalds */ 598e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 5991da177e4SLinus Torvalds { 600af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 601d2eb35acSNeilBrown int sectors; 602d2eb35acSNeilBrown int best_good_sectors; 6039dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 6049dedf603SShaohua Li int has_nonrot_disk; 605be4d3280SShaohua Li int disk; 60676073054SNeilBrown sector_t best_dist; 6079dedf603SShaohua Li unsigned int min_pending; 6083cb03002SNeilBrown struct md_rdev *rdev; 609f3ac8bf7SNeilBrown int choose_first; 61012cee5a8SShaohua Li int choose_next_idle; 6111da177e4SLinus Torvalds 6121da177e4SLinus Torvalds rcu_read_lock(); 6131da177e4SLinus Torvalds /* 6148ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 6151da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 6161da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 6171da177e4SLinus Torvalds */ 6181da177e4SLinus Torvalds retry: 619d2eb35acSNeilBrown sectors = r1_bio->sectors; 62076073054SNeilBrown best_disk = -1; 6219dedf603SShaohua Li best_dist_disk = -1; 62276073054SNeilBrown best_dist = MaxSector; 6239dedf603SShaohua Li best_pending_disk = -1; 6249dedf603SShaohua Li min_pending = UINT_MAX; 625d2eb35acSNeilBrown best_good_sectors = 0; 6269dedf603SShaohua Li has_nonrot_disk = 0; 62712cee5a8SShaohua Li choose_next_idle = 0; 6282e52d449SNeilBrown clear_bit(R1BIO_FailFast, &r1_bio->state); 629d2eb35acSNeilBrown 6307d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) || 6317d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) && 63290382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, 6337d49ffcfSGoldwyn Rodrigues this_sector + sectors))) 6347d49ffcfSGoldwyn Rodrigues choose_first = 1; 6357d49ffcfSGoldwyn Rodrigues else 6367d49ffcfSGoldwyn Rodrigues choose_first = 0; 6371da177e4SLinus Torvalds 638be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 63976073054SNeilBrown sector_t dist; 640d2eb35acSNeilBrown sector_t first_bad; 641d2eb35acSNeilBrown int bad_sectors; 6429dedf603SShaohua Li unsigned int pending; 64312cee5a8SShaohua Li bool nonrot; 644d2eb35acSNeilBrown 645f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 646f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 647f3ac8bf7SNeilBrown || rdev == NULL 64876073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 649f3ac8bf7SNeilBrown continue; 65076073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 65176073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 65276073054SNeilBrown continue; 65376073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 65476073054SNeilBrown /* Don't balance among write-mostly, just 65576073054SNeilBrown * use the first as a last resort */ 656d1901ef0STomáš Hodek if (best_dist_disk < 0) { 657307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 658307729c8SNeilBrown &first_bad, &bad_sectors)) { 659816b0acfSWei Fang if (first_bad <= this_sector) 660307729c8SNeilBrown /* Cannot use this */ 661307729c8SNeilBrown continue; 662307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 663307729c8SNeilBrown } else 664307729c8SNeilBrown best_good_sectors = sectors; 665d1901ef0STomáš Hodek best_dist_disk = disk; 666d1901ef0STomáš Hodek best_pending_disk = disk; 667307729c8SNeilBrown } 66876073054SNeilBrown continue; 6698ddf9efeSNeilBrown } 67076073054SNeilBrown /* This is a reasonable device to use. It might 67176073054SNeilBrown * even be best. 6721da177e4SLinus Torvalds */ 673d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 674d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 675d2eb35acSNeilBrown if (best_dist < MaxSector) 676d2eb35acSNeilBrown /* already have a better device */ 677d2eb35acSNeilBrown continue; 678d2eb35acSNeilBrown if (first_bad <= this_sector) { 679d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 680d2eb35acSNeilBrown * device, then we must not read beyond 681d2eb35acSNeilBrown * bad_sectors from another device.. 682d2eb35acSNeilBrown */ 683d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 684d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 685d2eb35acSNeilBrown sectors = bad_sectors; 686d2eb35acSNeilBrown if (best_good_sectors > sectors) 687d2eb35acSNeilBrown best_good_sectors = sectors; 688d2eb35acSNeilBrown 689d2eb35acSNeilBrown } else { 690d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 691d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 692d2eb35acSNeilBrown best_good_sectors = good_sectors; 693d2eb35acSNeilBrown best_disk = disk; 694d2eb35acSNeilBrown } 695d2eb35acSNeilBrown if (choose_first) 696d2eb35acSNeilBrown break; 697d2eb35acSNeilBrown } 698d2eb35acSNeilBrown continue; 699d82dd0e3STomasz Majchrzak } else { 700d82dd0e3STomasz Majchrzak if ((sectors > best_good_sectors) && (best_disk >= 0)) 701d82dd0e3STomasz Majchrzak best_disk = -1; 702d2eb35acSNeilBrown best_good_sectors = sectors; 703d82dd0e3STomasz Majchrzak } 704d2eb35acSNeilBrown 7052e52d449SNeilBrown if (best_disk >= 0) 7062e52d449SNeilBrown /* At least two disks to choose from so failfast is OK */ 7072e52d449SNeilBrown set_bit(R1BIO_FailFast, &r1_bio->state); 7082e52d449SNeilBrown 70912cee5a8SShaohua Li nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); 71012cee5a8SShaohua Li has_nonrot_disk |= nonrot; 7119dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 71276073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 71312cee5a8SShaohua Li if (choose_first) { 71476073054SNeilBrown best_disk = disk; 7151da177e4SLinus Torvalds break; 7161da177e4SLinus Torvalds } 71712cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 71812cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 71912cee5a8SShaohua Li || dist == 0) { 72012cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 72112cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 72212cee5a8SShaohua Li 72312cee5a8SShaohua Li best_disk = disk; 72412cee5a8SShaohua Li /* 72512cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 72612cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 72712cee5a8SShaohua Li * the idle disk. read_balance could already choose an 72812cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 72912cee5a8SShaohua Li * this disk. This doesn't matter because this disk 73012cee5a8SShaohua Li * will idle, next time it will be utilized after the 73112cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 73212cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 73312cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 73412cee5a8SShaohua Li * small, but not a big deal since when the second disk 73512cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 73612cee5a8SShaohua Li */ 73712cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 73812cee5a8SShaohua Li mirror->seq_start != MaxSector && 73912cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 74012cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 74112cee5a8SShaohua Li mirror->seq_start) { 74212cee5a8SShaohua Li choose_next_idle = 1; 74312cee5a8SShaohua Li continue; 74412cee5a8SShaohua Li } 74512cee5a8SShaohua Li break; 74612cee5a8SShaohua Li } 74712cee5a8SShaohua Li 74812cee5a8SShaohua Li if (choose_next_idle) 74912cee5a8SShaohua Li continue; 7509dedf603SShaohua Li 7519dedf603SShaohua Li if (min_pending > pending) { 7529dedf603SShaohua Li min_pending = pending; 7539dedf603SShaohua Li best_pending_disk = disk; 7549dedf603SShaohua Li } 7559dedf603SShaohua Li 75676073054SNeilBrown if (dist < best_dist) { 75776073054SNeilBrown best_dist = dist; 7589dedf603SShaohua Li best_dist_disk = disk; 7591da177e4SLinus Torvalds } 760f3ac8bf7SNeilBrown } 7611da177e4SLinus Torvalds 7629dedf603SShaohua Li /* 7639dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 7649dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 7659dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 7669dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 7679dedf603SShaohua Li */ 7689dedf603SShaohua Li if (best_disk == -1) { 7692e52d449SNeilBrown if (has_nonrot_disk || min_pending == 0) 7709dedf603SShaohua Li best_disk = best_pending_disk; 7719dedf603SShaohua Li else 7729dedf603SShaohua Li best_disk = best_dist_disk; 7739dedf603SShaohua Li } 7749dedf603SShaohua Li 77576073054SNeilBrown if (best_disk >= 0) { 77676073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 7778ddf9efeSNeilBrown if (!rdev) 7788ddf9efeSNeilBrown goto retry; 7798ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 780d2eb35acSNeilBrown sectors = best_good_sectors; 78112cee5a8SShaohua Li 78212cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 78312cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 78412cee5a8SShaohua Li 785be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 7861da177e4SLinus Torvalds } 7871da177e4SLinus Torvalds rcu_read_unlock(); 788d2eb35acSNeilBrown *max_sectors = sectors; 7891da177e4SLinus Torvalds 79076073054SNeilBrown return best_disk; 7911da177e4SLinus Torvalds } 7921da177e4SLinus Torvalds 793673ca68dSNeilBrown static void flush_bio_list(struct r1conf *conf, struct bio *bio) 794a35e63efSNeilBrown { 795673ca68dSNeilBrown /* flush any pending bitmap writes to disk before proceeding w/ I/O */ 796e64e4018SAndy Shevchenko md_bitmap_unplug(conf->mddev->bitmap); 79734db0cd6SNeilBrown wake_up(&conf->wait_barrier); 798a35e63efSNeilBrown 799a35e63efSNeilBrown while (bio) { /* submit pending writes */ 800a35e63efSNeilBrown struct bio *next = bio->bi_next; 801309dca30SChristoph Hellwig struct md_rdev *rdev = (void *)bio->bi_bdev; 802a35e63efSNeilBrown bio->bi_next = NULL; 80374d46992SChristoph Hellwig bio_set_dev(bio, rdev->bdev); 8045e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 8056308d8e3SGuoqing Jiang bio_io_error(bio); 8065e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 807309dca30SChristoph Hellwig !blk_queue_discard(bio->bi_bdev->bd_disk->queue))) 8082ff8cc2cSShaohua Li /* Just ignore it */ 8094246a0b6SChristoph Hellwig bio_endio(bio); 8102ff8cc2cSShaohua Li else 811ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 812a35e63efSNeilBrown bio = next; 8135fa4f8baSHannes Reinecke cond_resched(); 814a35e63efSNeilBrown } 815673ca68dSNeilBrown } 816673ca68dSNeilBrown 817673ca68dSNeilBrown static void flush_pending_writes(struct r1conf *conf) 818673ca68dSNeilBrown { 819673ca68dSNeilBrown /* Any writes that have been queued but are awaiting 820673ca68dSNeilBrown * bitmap updates get flushed here. 821673ca68dSNeilBrown */ 822673ca68dSNeilBrown spin_lock_irq(&conf->device_lock); 823673ca68dSNeilBrown 824673ca68dSNeilBrown if (conf->pending_bio_list.head) { 82518022a1bSShaohua Li struct blk_plug plug; 826673ca68dSNeilBrown struct bio *bio; 82718022a1bSShaohua Li 828673ca68dSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 829673ca68dSNeilBrown conf->pending_count = 0; 830673ca68dSNeilBrown spin_unlock_irq(&conf->device_lock); 831474beb57SNeilBrown 832474beb57SNeilBrown /* 833474beb57SNeilBrown * As this is called in a wait_event() loop (see freeze_array), 834474beb57SNeilBrown * current->state might be TASK_UNINTERRUPTIBLE which will 835474beb57SNeilBrown * cause a warning when we prepare to wait again. As it is 836474beb57SNeilBrown * rare that this path is taken, it is perfectly safe to force 837474beb57SNeilBrown * us to go around the wait_event() loop again, so the warning 838474beb57SNeilBrown * is a false-positive. Silence the warning by resetting 839474beb57SNeilBrown * thread state 840474beb57SNeilBrown */ 841474beb57SNeilBrown __set_current_state(TASK_RUNNING); 84218022a1bSShaohua Li blk_start_plug(&plug); 843673ca68dSNeilBrown flush_bio_list(conf, bio); 84418022a1bSShaohua Li blk_finish_plug(&plug); 845a35e63efSNeilBrown } else 846a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 8477eaceaccSJens Axboe } 8487eaceaccSJens Axboe 84917999be4SNeilBrown /* Barriers.... 85017999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 85117999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 85217999be4SNeilBrown * To do this we raise a 'barrier'. 85317999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 85417999be4SNeilBrown * to count how many activities are happening which preclude 85517999be4SNeilBrown * normal IO. 85617999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 85717999be4SNeilBrown * i.e. if nr_pending == 0. 85817999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 85917999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 86017999be4SNeilBrown * is ready, no other operations which require a barrier will start 86117999be4SNeilBrown * until the IO request has had a chance. 86217999be4SNeilBrown * 86317999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 86417999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 86517999be4SNeilBrown * allow_barrier when it has finished its IO. 86617999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 86717999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 86817999be4SNeilBrown * lower_barrier when the particular background IO completes. 8694675719dSHou Tao * 8704675719dSHou Tao * If resync/recovery is interrupted, returns -EINTR; 8714675719dSHou Tao * Otherwise, returns 0. 8721da177e4SLinus Torvalds */ 8734675719dSHou Tao static int raise_barrier(struct r1conf *conf, sector_t sector_nr) 8741da177e4SLinus Torvalds { 875fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 876fd76863eScolyli@suse.de 8771da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 8781da177e4SLinus Torvalds 87917999be4SNeilBrown /* Wait until no block IO is waiting */ 880824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 881824e47daScolyli@suse.de !atomic_read(&conf->nr_waiting[idx]), 882eed8c02eSLukas Czerner conf->resync_lock); 88317999be4SNeilBrown 88417999be4SNeilBrown /* block any new IO from starting */ 885824e47daScolyli@suse.de atomic_inc(&conf->barrier[idx]); 886824e47daScolyli@suse.de /* 887824e47daScolyli@suse.de * In raise_barrier() we firstly increase conf->barrier[idx] then 888824e47daScolyli@suse.de * check conf->nr_pending[idx]. In _wait_barrier() we firstly 889824e47daScolyli@suse.de * increase conf->nr_pending[idx] then check conf->barrier[idx]. 890824e47daScolyli@suse.de * A memory barrier here to make sure conf->nr_pending[idx] won't 891824e47daScolyli@suse.de * be fetched before conf->barrier[idx] is increased. Otherwise 892824e47daScolyli@suse.de * there will be a race between raise_barrier() and _wait_barrier(). 893824e47daScolyli@suse.de */ 894824e47daScolyli@suse.de smp_mb__after_atomic(); 89517999be4SNeilBrown 89679ef3a8aSmajianpeng /* For these conditions we must wait: 89779ef3a8aSmajianpeng * A: while the array is in frozen state 898fd76863eScolyli@suse.de * B: while conf->nr_pending[idx] is not 0, meaning regular I/O 899fd76863eScolyli@suse.de * existing in corresponding I/O barrier bucket. 900fd76863eScolyli@suse.de * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches 901fd76863eScolyli@suse.de * max resync count which allowed on current I/O barrier bucket. 90279ef3a8aSmajianpeng */ 90317999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 9048c242593SYufen Yu (!conf->array_frozen && 905824e47daScolyli@suse.de !atomic_read(&conf->nr_pending[idx]) && 9068c242593SYufen Yu atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH) || 9078c242593SYufen Yu test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery), 908eed8c02eSLukas Czerner conf->resync_lock); 90917999be4SNeilBrown 9108c242593SYufen Yu if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { 9118c242593SYufen Yu atomic_dec(&conf->barrier[idx]); 9128c242593SYufen Yu spin_unlock_irq(&conf->resync_lock); 9138c242593SYufen Yu wake_up(&conf->wait_barrier); 9148c242593SYufen Yu return -EINTR; 9158c242593SYufen Yu } 9168c242593SYufen Yu 91743ac9b84SXiao Ni atomic_inc(&conf->nr_sync_pending); 9181da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 9198c242593SYufen Yu 9208c242593SYufen Yu return 0; 9211da177e4SLinus Torvalds } 9221da177e4SLinus Torvalds 923fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr) 92417999be4SNeilBrown { 925fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 926fd76863eScolyli@suse.de 927824e47daScolyli@suse.de BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); 928fd76863eScolyli@suse.de 929824e47daScolyli@suse.de atomic_dec(&conf->barrier[idx]); 93043ac9b84SXiao Ni atomic_dec(&conf->nr_sync_pending); 93117999be4SNeilBrown wake_up(&conf->wait_barrier); 93217999be4SNeilBrown } 93317999be4SNeilBrown 934fd76863eScolyli@suse.de static void _wait_barrier(struct r1conf *conf, int idx) 93517999be4SNeilBrown { 936824e47daScolyli@suse.de /* 937824e47daScolyli@suse.de * We need to increase conf->nr_pending[idx] very early here, 938824e47daScolyli@suse.de * then raise_barrier() can be blocked when it waits for 939824e47daScolyli@suse.de * conf->nr_pending[idx] to be 0. Then we can avoid holding 940824e47daScolyli@suse.de * conf->resync_lock when there is no barrier raised in same 941824e47daScolyli@suse.de * barrier unit bucket. Also if the array is frozen, I/O 942824e47daScolyli@suse.de * should be blocked until array is unfrozen. 943824e47daScolyli@suse.de */ 944824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 945824e47daScolyli@suse.de /* 946824e47daScolyli@suse.de * In _wait_barrier() we firstly increase conf->nr_pending[idx], then 947824e47daScolyli@suse.de * check conf->barrier[idx]. In raise_barrier() we firstly increase 948824e47daScolyli@suse.de * conf->barrier[idx], then check conf->nr_pending[idx]. A memory 949824e47daScolyli@suse.de * barrier is necessary here to make sure conf->barrier[idx] won't be 950824e47daScolyli@suse.de * fetched before conf->nr_pending[idx] is increased. Otherwise there 951824e47daScolyli@suse.de * will be a race between _wait_barrier() and raise_barrier(). 952824e47daScolyli@suse.de */ 953824e47daScolyli@suse.de smp_mb__after_atomic(); 95479ef3a8aSmajianpeng 955824e47daScolyli@suse.de /* 956824e47daScolyli@suse.de * Don't worry about checking two atomic_t variables at same time 957824e47daScolyli@suse.de * here. If during we check conf->barrier[idx], the array is 958824e47daScolyli@suse.de * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is 959824e47daScolyli@suse.de * 0, it is safe to return and make the I/O continue. Because the 960824e47daScolyli@suse.de * array is frozen, all I/O returned here will eventually complete 961824e47daScolyli@suse.de * or be queued, no race will happen. See code comment in 962824e47daScolyli@suse.de * frozen_array(). 963824e47daScolyli@suse.de */ 964824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen) && 965824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx])) 966824e47daScolyli@suse.de return; 967824e47daScolyli@suse.de 968824e47daScolyli@suse.de /* 969824e47daScolyli@suse.de * After holding conf->resync_lock, conf->nr_pending[idx] 970824e47daScolyli@suse.de * should be decreased before waiting for barrier to drop. 971824e47daScolyli@suse.de * Otherwise, we may encounter a race condition because 972824e47daScolyli@suse.de * raise_barrer() might be waiting for conf->nr_pending[idx] 973824e47daScolyli@suse.de * to be 0 at same time. 974824e47daScolyli@suse.de */ 975824e47daScolyli@suse.de spin_lock_irq(&conf->resync_lock); 976824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 977824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 978824e47daScolyli@suse.de /* 979824e47daScolyli@suse.de * In case freeze_array() is waiting for 980824e47daScolyli@suse.de * get_unqueued_pending() == extra 981824e47daScolyli@suse.de */ 982824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 983824e47daScolyli@suse.de /* Wait for the barrier in same barrier unit bucket to drop. */ 984824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 985824e47daScolyli@suse.de !conf->array_frozen && 986824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx]), 987824e47daScolyli@suse.de conf->resync_lock); 988824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 989824e47daScolyli@suse.de atomic_dec(&conf->nr_waiting[idx]); 990fd76863eScolyli@suse.de spin_unlock_irq(&conf->resync_lock); 99179ef3a8aSmajianpeng } 99279ef3a8aSmajianpeng 993fd76863eScolyli@suse.de static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) 99479ef3a8aSmajianpeng { 995fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 99679ef3a8aSmajianpeng 997824e47daScolyli@suse.de /* 998824e47daScolyli@suse.de * Very similar to _wait_barrier(). The difference is, for read 999824e47daScolyli@suse.de * I/O we don't need wait for sync I/O, but if the whole array 1000824e47daScolyli@suse.de * is frozen, the read I/O still has to wait until the array is 1001824e47daScolyli@suse.de * unfrozen. Since there is no ordering requirement with 1002824e47daScolyli@suse.de * conf->barrier[idx] here, memory barrier is unnecessary as well. 1003824e47daScolyli@suse.de */ 1004824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 1005824e47daScolyli@suse.de 1006824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen)) 1007824e47daScolyli@suse.de return; 100817999be4SNeilBrown 100917999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 1010824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 1011824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 1012824e47daScolyli@suse.de /* 1013824e47daScolyli@suse.de * In case freeze_array() is waiting for 1014824e47daScolyli@suse.de * get_unqueued_pending() == extra 1015d6b42dcbSNeilBrown */ 101617999be4SNeilBrown wake_up(&conf->wait_barrier); 1017824e47daScolyli@suse.de /* Wait for array to be unfrozen */ 1018824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 1019fd76863eScolyli@suse.de !conf->array_frozen, 10201da177e4SLinus Torvalds conf->resync_lock); 1021824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 1022824e47daScolyli@suse.de atomic_dec(&conf->nr_waiting[idx]); 102317999be4SNeilBrown spin_unlock_irq(&conf->resync_lock); 102417999be4SNeilBrown } 102517999be4SNeilBrown 1026fd76863eScolyli@suse.de static void wait_barrier(struct r1conf *conf, sector_t sector_nr) 1027fd76863eScolyli@suse.de { 1028fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1029fd76863eScolyli@suse.de 1030fd76863eScolyli@suse.de _wait_barrier(conf, idx); 1031fd76863eScolyli@suse.de } 1032fd76863eScolyli@suse.de 1033fd76863eScolyli@suse.de static void _allow_barrier(struct r1conf *conf, int idx) 103417999be4SNeilBrown { 1035824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 103617999be4SNeilBrown wake_up(&conf->wait_barrier); 103717999be4SNeilBrown } 103817999be4SNeilBrown 1039fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr) 1040fd76863eScolyli@suse.de { 1041fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1042fd76863eScolyli@suse.de 1043fd76863eScolyli@suse.de _allow_barrier(conf, idx); 1044fd76863eScolyli@suse.de } 1045fd76863eScolyli@suse.de 1046fd76863eScolyli@suse.de /* conf->resync_lock should be held */ 1047fd76863eScolyli@suse.de static int get_unqueued_pending(struct r1conf *conf) 1048fd76863eScolyli@suse.de { 1049fd76863eScolyli@suse.de int idx, ret; 1050fd76863eScolyli@suse.de 105143ac9b84SXiao Ni ret = atomic_read(&conf->nr_sync_pending); 105243ac9b84SXiao Ni for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1053824e47daScolyli@suse.de ret += atomic_read(&conf->nr_pending[idx]) - 1054824e47daScolyli@suse.de atomic_read(&conf->nr_queued[idx]); 1055fd76863eScolyli@suse.de 1056fd76863eScolyli@suse.de return ret; 105717999be4SNeilBrown } 105817999be4SNeilBrown 1059e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra) 1060ddaf22abSNeilBrown { 1061fd76863eScolyli@suse.de /* Stop sync I/O and normal I/O and wait for everything to 106211353b9dSZhilong Liu * go quiet. 1063fd76863eScolyli@suse.de * This is called in two situations: 1064fd76863eScolyli@suse.de * 1) management command handlers (reshape, remove disk, quiesce). 1065fd76863eScolyli@suse.de * 2) one normal I/O request failed. 1066fd76863eScolyli@suse.de 1067fd76863eScolyli@suse.de * After array_frozen is set to 1, new sync IO will be blocked at 1068fd76863eScolyli@suse.de * raise_barrier(), and new normal I/O will blocked at _wait_barrier() 1069fd76863eScolyli@suse.de * or wait_read_barrier(). The flying I/Os will either complete or be 1070fd76863eScolyli@suse.de * queued. When everything goes quite, there are only queued I/Os left. 1071fd76863eScolyli@suse.de 1072fd76863eScolyli@suse.de * Every flying I/O contributes to a conf->nr_pending[idx], idx is the 1073fd76863eScolyli@suse.de * barrier bucket index which this I/O request hits. When all sync and 1074fd76863eScolyli@suse.de * normal I/O are queued, sum of all conf->nr_pending[] will match sum 1075fd76863eScolyli@suse.de * of all conf->nr_queued[]. But normal I/O failure is an exception, 1076fd76863eScolyli@suse.de * in handle_read_error(), we may call freeze_array() before trying to 1077fd76863eScolyli@suse.de * fix the read error. In this case, the error read I/O is not queued, 1078fd76863eScolyli@suse.de * so get_unqueued_pending() == 1. 1079fd76863eScolyli@suse.de * 1080fd76863eScolyli@suse.de * Therefore before this function returns, we need to wait until 1081fd76863eScolyli@suse.de * get_unqueued_pendings(conf) gets equal to extra. For 1082fd76863eScolyli@suse.de * normal I/O context, extra is 1, in rested situations extra is 0. 1083ddaf22abSNeilBrown */ 1084ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1085b364e3d0Smajianpeng conf->array_frozen = 1; 1086578b54adSNeilBrown raid1_log(conf->mddev, "wait freeze"); 1087fd76863eScolyli@suse.de wait_event_lock_irq_cmd( 1088fd76863eScolyli@suse.de conf->wait_barrier, 1089fd76863eScolyli@suse.de get_unqueued_pending(conf) == extra, 1090ddaf22abSNeilBrown conf->resync_lock, 1091c3b328acSNeilBrown flush_pending_writes(conf)); 1092ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1093ddaf22abSNeilBrown } 1094e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 1095ddaf22abSNeilBrown { 1096ddaf22abSNeilBrown /* reverse the effect of the freeze */ 1097ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1098b364e3d0Smajianpeng conf->array_frozen = 0; 1099ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1100824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 1101ddaf22abSNeilBrown } 1102ddaf22abSNeilBrown 110316d56e2fSShaohua Li static void alloc_behind_master_bio(struct r1bio *r1_bio, 1104cb83efcfSNeilBrown struct bio *bio) 11054b6d287fSNeilBrown { 1106cb83efcfSNeilBrown int size = bio->bi_iter.bi_size; 1107841c1316SMing Lei unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 1108841c1316SMing Lei int i = 0; 1109841c1316SMing Lei struct bio *behind_bio = NULL; 11104b6d287fSNeilBrown 1111a78f18daSChristoph Hellwig behind_bio = bio_alloc_bioset(GFP_NOIO, vcnt, &r1_bio->mddev->bio_set); 1112841c1316SMing Lei if (!behind_bio) 111316d56e2fSShaohua Li return; 1114841c1316SMing Lei 111541743c1fSShaohua Li /* discard op, we don't support writezero/writesame yet */ 111616d56e2fSShaohua Li if (!bio_has_data(bio)) { 111716d56e2fSShaohua Li behind_bio->bi_iter.bi_size = size; 111841743c1fSShaohua Li goto skip_copy; 111916d56e2fSShaohua Li } 112041743c1fSShaohua Li 1121dba40d46SMariusz Dabrowski behind_bio->bi_write_hint = bio->bi_write_hint; 1122dba40d46SMariusz Dabrowski 1123841c1316SMing Lei while (i < vcnt && size) { 1124841c1316SMing Lei struct page *page; 1125841c1316SMing Lei int len = min_t(int, PAGE_SIZE, size); 1126841c1316SMing Lei 1127841c1316SMing Lei page = alloc_page(GFP_NOIO); 1128841c1316SMing Lei if (unlikely(!page)) 1129841c1316SMing Lei goto free_pages; 1130841c1316SMing Lei 1131841c1316SMing Lei bio_add_page(behind_bio, page, len, 0); 1132841c1316SMing Lei 1133841c1316SMing Lei size -= len; 1134841c1316SMing Lei i++; 11354b6d287fSNeilBrown } 11364b6d287fSNeilBrown 1137cb83efcfSNeilBrown bio_copy_data(behind_bio, bio); 113841743c1fSShaohua Li skip_copy: 113956a64c17SLuis de Bethencourt r1_bio->behind_master_bio = behind_bio; 1140841c1316SMing Lei set_bit(R1BIO_BehindIO, &r1_bio->state); 1141841c1316SMing Lei 114216d56e2fSShaohua Li return; 1143841c1316SMing Lei 1144841c1316SMing Lei free_pages: 11454f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n", 11464f024f37SKent Overstreet bio->bi_iter.bi_size); 1147841c1316SMing Lei bio_free_pages(behind_bio); 114816d56e2fSShaohua Li bio_put(behind_bio); 11494b6d287fSNeilBrown } 11504b6d287fSNeilBrown 1151f54a9d0eSNeilBrown struct raid1_plug_cb { 1152f54a9d0eSNeilBrown struct blk_plug_cb cb; 1153f54a9d0eSNeilBrown struct bio_list pending; 1154f54a9d0eSNeilBrown int pending_cnt; 1155f54a9d0eSNeilBrown }; 1156f54a9d0eSNeilBrown 1157f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) 1158f54a9d0eSNeilBrown { 1159f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, 1160f54a9d0eSNeilBrown cb); 1161f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data; 1162f54a9d0eSNeilBrown struct r1conf *conf = mddev->private; 1163f54a9d0eSNeilBrown struct bio *bio; 1164f54a9d0eSNeilBrown 1165874807a8SNeilBrown if (from_schedule || current->bio_list) { 1166f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock); 1167f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending); 1168f54a9d0eSNeilBrown conf->pending_count += plug->pending_cnt; 1169f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock); 1170ee0b0244SNeilBrown wake_up(&conf->wait_barrier); 1171f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread); 1172f54a9d0eSNeilBrown kfree(plug); 1173f54a9d0eSNeilBrown return; 1174f54a9d0eSNeilBrown } 1175f54a9d0eSNeilBrown 1176f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */ 1177f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending); 1178673ca68dSNeilBrown flush_bio_list(conf, bio); 1179f54a9d0eSNeilBrown kfree(plug); 1180f54a9d0eSNeilBrown } 1181f54a9d0eSNeilBrown 1182689389a0SNeilBrown static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) 1183689389a0SNeilBrown { 1184689389a0SNeilBrown r1_bio->master_bio = bio; 1185689389a0SNeilBrown r1_bio->sectors = bio_sectors(bio); 1186689389a0SNeilBrown r1_bio->state = 0; 1187689389a0SNeilBrown r1_bio->mddev = mddev; 1188689389a0SNeilBrown r1_bio->sector = bio->bi_iter.bi_sector; 1189689389a0SNeilBrown } 1190689389a0SNeilBrown 1191fd76863eScolyli@suse.de static inline struct r1bio * 1192689389a0SNeilBrown alloc_r1bio(struct mddev *mddev, struct bio *bio) 1193fd76863eScolyli@suse.de { 1194fd76863eScolyli@suse.de struct r1conf *conf = mddev->private; 1195fd76863eScolyli@suse.de struct r1bio *r1_bio; 1196fd76863eScolyli@suse.de 1197afeee514SKent Overstreet r1_bio = mempool_alloc(&conf->r1bio_pool, GFP_NOIO); 1198689389a0SNeilBrown /* Ensure no bio records IO_BLOCKED */ 1199689389a0SNeilBrown memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); 1200689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio); 1201fd76863eScolyli@suse.de return r1_bio; 1202fd76863eScolyli@suse.de } 1203fd76863eScolyli@suse.de 1204c230e7e5SNeilBrown static void raid1_read_request(struct mddev *mddev, struct bio *bio, 1205689389a0SNeilBrown int max_read_sectors, struct r1bio *r1_bio) 12061da177e4SLinus Torvalds { 1207e8096360SNeilBrown struct r1conf *conf = mddev->private; 12080eaf822cSJonathan Brassow struct raid1_info *mirror; 12091da177e4SLinus Torvalds struct bio *read_bio; 12103b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 1211796a5cf0SMike Christie const int op = bio_op(bio); 12121eff9d32SJens Axboe const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); 12131f68f0c4SNeilBrown int max_sectors; 1214d2eb35acSNeilBrown int rdisk; 12159b8ae7b9SGuoqing Jiang bool r1bio_existed = !!r1_bio; 1216689389a0SNeilBrown char b[BDEVNAME_SIZE]; 1217689389a0SNeilBrown 1218689389a0SNeilBrown /* 1219689389a0SNeilBrown * If r1_bio is set, we are blocking the raid1d thread 1220689389a0SNeilBrown * so there is a tiny risk of deadlock. So ask for 1221689389a0SNeilBrown * emergency memory if needed. 1222689389a0SNeilBrown */ 1223689389a0SNeilBrown gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; 1224689389a0SNeilBrown 12259b8ae7b9SGuoqing Jiang if (r1bio_existed) { 1226689389a0SNeilBrown /* Need to get the block device name carefully */ 1227689389a0SNeilBrown struct md_rdev *rdev; 1228689389a0SNeilBrown rcu_read_lock(); 1229689389a0SNeilBrown rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); 1230689389a0SNeilBrown if (rdev) 1231689389a0SNeilBrown bdevname(rdev->bdev, b); 1232689389a0SNeilBrown else 1233689389a0SNeilBrown strcpy(b, "???"); 1234689389a0SNeilBrown rcu_read_unlock(); 1235689389a0SNeilBrown } 1236d2eb35acSNeilBrown 1237fd76863eScolyli@suse.de /* 1238fd76863eScolyli@suse.de * Still need barrier for READ in case that whole 1239fd76863eScolyli@suse.de * array is frozen. 1240fd76863eScolyli@suse.de */ 1241fd76863eScolyli@suse.de wait_read_barrier(conf, bio->bi_iter.bi_sector); 12423b046a97SRobert LeBlanc 1243689389a0SNeilBrown if (!r1_bio) 1244689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio); 1245689389a0SNeilBrown else 1246689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio); 1247c230e7e5SNeilBrown r1_bio->sectors = max_read_sectors; 1248fd76863eScolyli@suse.de 1249fd76863eScolyli@suse.de /* 1250fd76863eScolyli@suse.de * make_request() can abort the operation when read-ahead is being 1251fd76863eScolyli@suse.de * used and no empty request is available. 1252fd76863eScolyli@suse.de */ 1253d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 12541da177e4SLinus Torvalds 12551da177e4SLinus Torvalds if (rdisk < 0) { 12561da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 12579b8ae7b9SGuoqing Jiang if (r1bio_existed) { 1258689389a0SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 1259689389a0SNeilBrown mdname(mddev), 1260689389a0SNeilBrown b, 1261689389a0SNeilBrown (unsigned long long)r1_bio->sector); 1262689389a0SNeilBrown } 12631da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 12645a7bbad2SChristoph Hellwig return; 12651da177e4SLinus Torvalds } 12661da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 12671da177e4SLinus Torvalds 12689b8ae7b9SGuoqing Jiang if (r1bio_existed) 1269689389a0SNeilBrown pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", 1270689389a0SNeilBrown mdname(mddev), 1271689389a0SNeilBrown (unsigned long long)r1_bio->sector, 1272689389a0SNeilBrown bdevname(mirror->rdev->bdev, b)); 1273689389a0SNeilBrown 1274e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1275e555190dSNeilBrown bitmap) { 12763b046a97SRobert LeBlanc /* 12773b046a97SRobert LeBlanc * Reading from a write-mostly device must take care not to 12783b046a97SRobert LeBlanc * over-take any writes that are 'behind' 1279e555190dSNeilBrown */ 1280578b54adSNeilBrown raid1_log(mddev, "wait behind writes"); 1281e555190dSNeilBrown wait_event(bitmap->behind_wait, 1282e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 1283e555190dSNeilBrown } 1284c230e7e5SNeilBrown 1285c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1286c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1287afeee514SKent Overstreet gfp, &conf->bio_split); 1288c230e7e5SNeilBrown bio_chain(split, bio); 1289ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 1290c230e7e5SNeilBrown bio = split; 1291c230e7e5SNeilBrown r1_bio->master_bio = bio; 1292c230e7e5SNeilBrown r1_bio->sectors = max_sectors; 1293c230e7e5SNeilBrown } 1294c230e7e5SNeilBrown 12951da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 12961da177e4SLinus Torvalds 1297a0159832SGuoqing Jiang if (!r1bio_existed && blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) 1298a0159832SGuoqing Jiang r1_bio->start_time = bio_start_io_acct(bio); 1299a0159832SGuoqing Jiang 1300afeee514SKent Overstreet read_bio = bio_clone_fast(bio, gfp, &mddev->bio_set); 13011da177e4SLinus Torvalds 13021da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 13031da177e4SLinus Torvalds 13044f024f37SKent Overstreet read_bio->bi_iter.bi_sector = r1_bio->sector + 13054f024f37SKent Overstreet mirror->rdev->data_offset; 130674d46992SChristoph Hellwig bio_set_dev(read_bio, mirror->rdev->bdev); 13071da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 1308796a5cf0SMike Christie bio_set_op_attrs(read_bio, op, do_sync); 13092e52d449SNeilBrown if (test_bit(FailFast, &mirror->rdev->flags) && 13102e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 13112e52d449SNeilBrown read_bio->bi_opf |= MD_FAILFAST; 13121da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 13131da177e4SLinus Torvalds 1314109e3765SNeilBrown if (mddev->gendisk) 13151c02fca6SChristoph Hellwig trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk), 13161c02fca6SChristoph Hellwig r1_bio->sector); 1317109e3765SNeilBrown 1318ed00aabdSChristoph Hellwig submit_bio_noacct(read_bio); 13191da177e4SLinus Torvalds } 13201da177e4SLinus Torvalds 1321c230e7e5SNeilBrown static void raid1_write_request(struct mddev *mddev, struct bio *bio, 1322c230e7e5SNeilBrown int max_write_sectors) 13233b046a97SRobert LeBlanc { 13243b046a97SRobert LeBlanc struct r1conf *conf = mddev->private; 1325fd76863eScolyli@suse.de struct r1bio *r1_bio; 13263b046a97SRobert LeBlanc int i, disks; 13273b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 13283b046a97SRobert LeBlanc unsigned long flags; 13293b046a97SRobert LeBlanc struct md_rdev *blocked_rdev; 13303b046a97SRobert LeBlanc struct blk_plug_cb *cb; 13313b046a97SRobert LeBlanc struct raid1_plug_cb *plug = NULL; 13323b046a97SRobert LeBlanc int first_clone; 13333b046a97SRobert LeBlanc int max_sectors; 1334*6607cd31SGuoqing Jiang bool write_behind = false; 13353b046a97SRobert LeBlanc 1336b3143b9aSNeilBrown if (mddev_is_clustered(mddev) && 13373b046a97SRobert LeBlanc md_cluster_ops->area_resyncing(mddev, WRITE, 1338b3143b9aSNeilBrown bio->bi_iter.bi_sector, bio_end_sector(bio))) { 13393b046a97SRobert LeBlanc 13403b046a97SRobert LeBlanc DEFINE_WAIT(w); 13413b046a97SRobert LeBlanc for (;;) { 13423b046a97SRobert LeBlanc prepare_to_wait(&conf->wait_barrier, 1343ae89fd3dSMikulas Patocka &w, TASK_IDLE); 1344f81f7302SGuoqing Jiang if (!md_cluster_ops->area_resyncing(mddev, WRITE, 13453b046a97SRobert LeBlanc bio->bi_iter.bi_sector, 1346b3143b9aSNeilBrown bio_end_sector(bio))) 13473b046a97SRobert LeBlanc break; 13483b046a97SRobert LeBlanc schedule(); 13493b046a97SRobert LeBlanc } 13503b046a97SRobert LeBlanc finish_wait(&conf->wait_barrier, &w); 13513b046a97SRobert LeBlanc } 1352f81f7302SGuoqing Jiang 1353f81f7302SGuoqing Jiang /* 1354f81f7302SGuoqing Jiang * Register the new request and wait if the reconstruction 1355f81f7302SGuoqing Jiang * thread has put up a bar for new requests. 1356f81f7302SGuoqing Jiang * Continue immediately if no resync is active currently. 1357f81f7302SGuoqing Jiang */ 1358fd76863eScolyli@suse.de wait_barrier(conf, bio->bi_iter.bi_sector); 1359fd76863eScolyli@suse.de 1360689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio); 1361c230e7e5SNeilBrown r1_bio->sectors = max_write_sectors; 13623b046a97SRobert LeBlanc 136334db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 136434db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 1365578b54adSNeilBrown raid1_log(mddev, "wait queued"); 136634db0cd6SNeilBrown wait_event(conf->wait_barrier, 136734db0cd6SNeilBrown conf->pending_count < max_queued_requests); 136834db0cd6SNeilBrown } 13691f68f0c4SNeilBrown /* first select target devices under rcu_lock and 13701da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 13711da177e4SLinus Torvalds * bios[x] to bio 13721f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 13731f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 13741f68f0c4SNeilBrown * blocks. 13751f68f0c4SNeilBrown * This potentially requires several writes to write around 13761f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 13771f68f0c4SNeilBrown * with a set of bios attached. 13781da177e4SLinus Torvalds */ 1379c3b328acSNeilBrown 13808f19ccb2SNeilBrown disks = conf->raid_disks * 2; 13816bfe0b49SDan Williams retry_write: 13826bfe0b49SDan Williams blocked_rdev = NULL; 13831da177e4SLinus Torvalds rcu_read_lock(); 13841f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 13851da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 13863cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1387*6607cd31SGuoqing Jiang 1388*6607cd31SGuoqing Jiang /* 1389*6607cd31SGuoqing Jiang * The write-behind io is only attempted on drives marked as 1390*6607cd31SGuoqing Jiang * write-mostly, which means we could allocate write behind 1391*6607cd31SGuoqing Jiang * bio later. 1392*6607cd31SGuoqing Jiang */ 1393*6607cd31SGuoqing Jiang if (rdev && test_bit(WriteMostly, &rdev->flags)) 1394*6607cd31SGuoqing Jiang write_behind = true; 1395*6607cd31SGuoqing Jiang 13966bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 13976bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 13986bfe0b49SDan Williams blocked_rdev = rdev; 13996bfe0b49SDan Williams break; 14006bfe0b49SDan Williams } 14011da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 14028ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) { 14038f19ccb2SNeilBrown if (i < conf->raid_disks) 14041f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 14051f68f0c4SNeilBrown continue; 1406964147d5SNeilBrown } 14071f68f0c4SNeilBrown 14081f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 14091f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 14101f68f0c4SNeilBrown sector_t first_bad; 14111f68f0c4SNeilBrown int bad_sectors; 14121f68f0c4SNeilBrown int is_bad; 14131f68f0c4SNeilBrown 14143b046a97SRobert LeBlanc is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, 14151f68f0c4SNeilBrown &first_bad, &bad_sectors); 14161f68f0c4SNeilBrown if (is_bad < 0) { 14171f68f0c4SNeilBrown /* mustn't write here until the bad block is 14181f68f0c4SNeilBrown * acknowledged*/ 14191f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 14201f68f0c4SNeilBrown blocked_rdev = rdev; 14211f68f0c4SNeilBrown break; 14221f68f0c4SNeilBrown } 14231f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 14241f68f0c4SNeilBrown /* Cannot write here at all */ 14251f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 14261f68f0c4SNeilBrown if (bad_sectors < max_sectors) 14271f68f0c4SNeilBrown /* mustn't write more than bad_sectors 14281f68f0c4SNeilBrown * to other devices yet 14291f68f0c4SNeilBrown */ 14301f68f0c4SNeilBrown max_sectors = bad_sectors; 14311f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 14321f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 14331f68f0c4SNeilBrown * only applies if the disk is 14341f68f0c4SNeilBrown * missing, so it might be re-added, 14351f68f0c4SNeilBrown * and we want to know to recover this 14361f68f0c4SNeilBrown * chunk. 14371f68f0c4SNeilBrown * In this case the device is here, 14381f68f0c4SNeilBrown * and the fact that this chunk is not 14391f68f0c4SNeilBrown * in-sync is recorded in the bad 14401f68f0c4SNeilBrown * block log 14411f68f0c4SNeilBrown */ 14421f68f0c4SNeilBrown continue; 14431f68f0c4SNeilBrown } 14441f68f0c4SNeilBrown if (is_bad) { 14451f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 14461f68f0c4SNeilBrown if (good_sectors < max_sectors) 14471f68f0c4SNeilBrown max_sectors = good_sectors; 14481f68f0c4SNeilBrown } 14491f68f0c4SNeilBrown } 14501f68f0c4SNeilBrown r1_bio->bios[i] = bio; 14511da177e4SLinus Torvalds } 14521da177e4SLinus Torvalds rcu_read_unlock(); 14531da177e4SLinus Torvalds 14546bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 14556bfe0b49SDan Williams /* Wait for this device to become unblocked */ 14566bfe0b49SDan Williams int j; 14576bfe0b49SDan Williams 14586bfe0b49SDan Williams for (j = 0; j < i; j++) 14596bfe0b49SDan Williams if (r1_bio->bios[j]) 14606bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 14611f68f0c4SNeilBrown r1_bio->state = 0; 1462fd76863eScolyli@suse.de allow_barrier(conf, bio->bi_iter.bi_sector); 1463578b54adSNeilBrown raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); 14646bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 1465fd76863eScolyli@suse.de wait_barrier(conf, bio->bi_iter.bi_sector); 14666bfe0b49SDan Williams goto retry_write; 14676bfe0b49SDan Williams } 14686bfe0b49SDan Williams 1469*6607cd31SGuoqing Jiang /* 1470*6607cd31SGuoqing Jiang * When using a bitmap, we may call alloc_behind_master_bio below. 1471*6607cd31SGuoqing Jiang * alloc_behind_master_bio allocates a copy of the data payload a page 1472*6607cd31SGuoqing Jiang * at a time and thus needs a new bio that can fit the whole payload 1473*6607cd31SGuoqing Jiang * this bio in page sized chunks. 1474*6607cd31SGuoqing Jiang */ 1475*6607cd31SGuoqing Jiang if (write_behind && bitmap) 1476*6607cd31SGuoqing Jiang max_sectors = min_t(int, max_sectors, 1477*6607cd31SGuoqing Jiang BIO_MAX_VECS * (PAGE_SIZE >> 9)); 1478c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1479c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1480afeee514SKent Overstreet GFP_NOIO, &conf->bio_split); 1481c230e7e5SNeilBrown bio_chain(split, bio); 1482ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 1483c230e7e5SNeilBrown bio = split; 1484c230e7e5SNeilBrown r1_bio->master_bio = bio; 14851f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 1486191ea9b2SNeilBrown } 14874b6d287fSNeilBrown 1488a0159832SGuoqing Jiang if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) 1489a0159832SGuoqing Jiang r1_bio->start_time = bio_start_io_acct(bio); 14904e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 14914b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1492191ea9b2SNeilBrown 14931f68f0c4SNeilBrown first_clone = 1; 1494d8c84c4fSMing Lei 14951da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 14968e58e327SMing Lei struct bio *mbio = NULL; 149769df9cfcSGuoqing Jiang struct md_rdev *rdev = conf->mirrors[i].rdev; 14981da177e4SLinus Torvalds if (!r1_bio->bios[i]) 14991da177e4SLinus Torvalds continue; 15001da177e4SLinus Torvalds 15011f68f0c4SNeilBrown if (first_clone) { 15021f68f0c4SNeilBrown /* do behind I/O ? 15031f68f0c4SNeilBrown * Not if there are too many, or cannot 15041f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 15051f68f0c4SNeilBrown * is waiting for behind writes to flush */ 15061f68f0c4SNeilBrown if (bitmap && 15071f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 15081f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 15098e58e327SMing Lei !waitqueue_active(&bitmap->behind_wait)) { 151016d56e2fSShaohua Li alloc_behind_master_bio(r1_bio, bio); 15118e58e327SMing Lei } 15121da177e4SLinus Torvalds 1513e64e4018SAndy Shevchenko md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors, 1514e64e4018SAndy Shevchenko test_bit(R1BIO_BehindIO, &r1_bio->state)); 15151f68f0c4SNeilBrown first_clone = 0; 15161f68f0c4SNeilBrown } 15178e58e327SMing Lei 1518841c1316SMing Lei if (r1_bio->behind_master_bio) 1519841c1316SMing Lei mbio = bio_clone_fast(r1_bio->behind_master_bio, 1520afeee514SKent Overstreet GFP_NOIO, &mddev->bio_set); 1521c230e7e5SNeilBrown else 1522afeee514SKent Overstreet mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set); 15238e58e327SMing Lei 1524841c1316SMing Lei if (r1_bio->behind_master_bio) { 152569df9cfcSGuoqing Jiang if (test_bit(CollisionCheck, &rdev->flags)) 1526d0d2d8baSGuoqing Jiang wait_for_serialization(rdev, r1_bio); 15273e148a32SGuoqing Jiang if (test_bit(WriteMostly, &rdev->flags)) 15284b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 152969df9cfcSGuoqing Jiang } else if (mddev->serialize_policy) 1530d0d2d8baSGuoqing Jiang wait_for_serialization(rdev, r1_bio); 15314b6d287fSNeilBrown 15321f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 15331f68f0c4SNeilBrown 15344f024f37SKent Overstreet mbio->bi_iter.bi_sector = (r1_bio->sector + 15351f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 153674d46992SChristoph Hellwig bio_set_dev(mbio, conf->mirrors[i].rdev->bdev); 15371f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 1538a682e003SLinus Torvalds mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); 1539212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && 1540212e7eb7SNeilBrown !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && 1541212e7eb7SNeilBrown conf->raid_disks - mddev->degraded > 1) 1542212e7eb7SNeilBrown mbio->bi_opf |= MD_FAILFAST; 15431f68f0c4SNeilBrown mbio->bi_private = r1_bio; 15441f68f0c4SNeilBrown 15451da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1546f54a9d0eSNeilBrown 1547109e3765SNeilBrown if (mddev->gendisk) 15481c02fca6SChristoph Hellwig trace_block_bio_remap(mbio, disk_devt(mddev->gendisk), 1549109e3765SNeilBrown r1_bio->sector); 1550109e3765SNeilBrown /* flush_pending_writes() needs access to the rdev so...*/ 1551309dca30SChristoph Hellwig mbio->bi_bdev = (void *)conf->mirrors[i].rdev; 1552109e3765SNeilBrown 1553f54a9d0eSNeilBrown cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); 1554f54a9d0eSNeilBrown if (cb) 1555f54a9d0eSNeilBrown plug = container_of(cb, struct raid1_plug_cb, cb); 1556f54a9d0eSNeilBrown else 1557f54a9d0eSNeilBrown plug = NULL; 1558f54a9d0eSNeilBrown if (plug) { 1559f54a9d0eSNeilBrown bio_list_add(&plug->pending, mbio); 1560f54a9d0eSNeilBrown plug->pending_cnt++; 1561f54a9d0eSNeilBrown } else { 156223b245c0SShaohua Li spin_lock_irqsave(&conf->device_lock, flags); 15634e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 156434db0cd6SNeilBrown conf->pending_count++; 1565191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1566b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 15674e78064fSNeilBrown } 156823b245c0SShaohua Li } 15691f68f0c4SNeilBrown 1570079fa166SNeilBrown r1_bio_write_done(r1_bio); 1571079fa166SNeilBrown 1572079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1573079fa166SNeilBrown wake_up(&conf->wait_barrier); 15741da177e4SLinus Torvalds } 15751da177e4SLinus Torvalds 1576cc27b0c7SNeilBrown static bool raid1_make_request(struct mddev *mddev, struct bio *bio) 15773b046a97SRobert LeBlanc { 1578fd76863eScolyli@suse.de sector_t sectors; 15793b046a97SRobert LeBlanc 1580775d7831SDavid Jeffery if (unlikely(bio->bi_opf & REQ_PREFLUSH) 1581775d7831SDavid Jeffery && md_flush_request(mddev, bio)) 1582cc27b0c7SNeilBrown return true; 15833b046a97SRobert LeBlanc 1584c230e7e5SNeilBrown /* 1585c230e7e5SNeilBrown * There is a limit to the maximum size, but 1586c230e7e5SNeilBrown * the read/write handler might find a lower limit 1587c230e7e5SNeilBrown * due to bad blocks. To avoid multiple splits, 1588c230e7e5SNeilBrown * we pass the maximum number of sectors down 1589c230e7e5SNeilBrown * and let the lower level perform the split. 1590c230e7e5SNeilBrown */ 1591fd76863eScolyli@suse.de sectors = align_to_barrier_unit_end( 1592fd76863eScolyli@suse.de bio->bi_iter.bi_sector, bio_sectors(bio)); 15933b046a97SRobert LeBlanc 1594c230e7e5SNeilBrown if (bio_data_dir(bio) == READ) 1595689389a0SNeilBrown raid1_read_request(mddev, bio, sectors, NULL); 1596cc27b0c7SNeilBrown else { 1597cc27b0c7SNeilBrown if (!md_write_start(mddev,bio)) 1598cc27b0c7SNeilBrown return false; 1599c230e7e5SNeilBrown raid1_write_request(mddev, bio, sectors); 16003b046a97SRobert LeBlanc } 1601cc27b0c7SNeilBrown return true; 1602cc27b0c7SNeilBrown } 16033b046a97SRobert LeBlanc 1604849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev) 16051da177e4SLinus Torvalds { 1606e8096360SNeilBrown struct r1conf *conf = mddev->private; 16071da177e4SLinus Torvalds int i; 16081da177e4SLinus Torvalds 16091da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 161011ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1611ddac7c7eSNeilBrown rcu_read_lock(); 1612ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 16133cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 16141da177e4SLinus Torvalds seq_printf(seq, "%s", 1615ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1616ddac7c7eSNeilBrown } 1617ddac7c7eSNeilBrown rcu_read_unlock(); 16181da177e4SLinus Torvalds seq_printf(seq, "]"); 16191da177e4SLinus Torvalds } 16201da177e4SLinus Torvalds 1621849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) 16221da177e4SLinus Torvalds { 16231da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1624e8096360SNeilBrown struct r1conf *conf = mddev->private; 1625423f04d6SNeilBrown unsigned long flags; 16261da177e4SLinus Torvalds 16271da177e4SLinus Torvalds /* 16281da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 16299a567843SGuoqing Jiang * else if it is the last working disks with "fail_last_dev == false", 16309a567843SGuoqing Jiang * ignore the error, let the next level up know. 16311da177e4SLinus Torvalds * else mark the drive as failed 16321da177e4SLinus Torvalds */ 16332e52d449SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 16349a567843SGuoqing Jiang if (test_bit(In_sync, &rdev->flags) && !mddev->fail_last_dev 16354044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 16361da177e4SLinus Torvalds /* 16371da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 16384044ba58SNeilBrown * normal single drive. 16394044ba58SNeilBrown * However don't try a recovery from this drive as 16404044ba58SNeilBrown * it is very likely to fail. 16411da177e4SLinus Torvalds */ 16425389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 16432e52d449SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16441da177e4SLinus Torvalds return; 16454044ba58SNeilBrown } 1646de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1647ebda52faSYufen Yu if (test_and_clear_bit(In_sync, &rdev->flags)) 16481da177e4SLinus Torvalds mddev->degraded++; 1649dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 1650423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16511da177e4SLinus Torvalds /* 16521da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 16531da177e4SLinus Torvalds */ 1654dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 16552953079cSShaohua Li set_mask_bits(&mddev->sb_flags, 0, 16562953079cSShaohua Li BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); 16571d41c216SNeilBrown pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" 1658067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 16599dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 16609dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 16611da177e4SLinus Torvalds } 16621da177e4SLinus Torvalds 1663e8096360SNeilBrown static void print_conf(struct r1conf *conf) 16641da177e4SLinus Torvalds { 16651da177e4SLinus Torvalds int i; 16661da177e4SLinus Torvalds 16671d41c216SNeilBrown pr_debug("RAID1 conf printout:\n"); 16681da177e4SLinus Torvalds if (!conf) { 16691d41c216SNeilBrown pr_debug("(!conf)\n"); 16701da177e4SLinus Torvalds return; 16711da177e4SLinus Torvalds } 16721d41c216SNeilBrown pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 16731da177e4SLinus Torvalds conf->raid_disks); 16741da177e4SLinus Torvalds 1675ddac7c7eSNeilBrown rcu_read_lock(); 16761da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 16771da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 16783cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1679ddac7c7eSNeilBrown if (rdev) 16801d41c216SNeilBrown pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", 1681ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1682ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1683ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 16841da177e4SLinus Torvalds } 1685ddac7c7eSNeilBrown rcu_read_unlock(); 16861da177e4SLinus Torvalds } 16871da177e4SLinus Torvalds 1688e8096360SNeilBrown static void close_sync(struct r1conf *conf) 16891da177e4SLinus Torvalds { 1690f6eca2d4SNate Dailey int idx; 1691f6eca2d4SNate Dailey 1692f6eca2d4SNate Dailey for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) { 1693f6eca2d4SNate Dailey _wait_barrier(conf, idx); 1694f6eca2d4SNate Dailey _allow_barrier(conf, idx); 1695f6eca2d4SNate Dailey } 16961da177e4SLinus Torvalds 1697afeee514SKent Overstreet mempool_exit(&conf->r1buf_pool); 16981da177e4SLinus Torvalds } 16991da177e4SLinus Torvalds 1700fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 17011da177e4SLinus Torvalds { 17021da177e4SLinus Torvalds int i; 1703e8096360SNeilBrown struct r1conf *conf = mddev->private; 17046b965620SNeilBrown int count = 0; 17056b965620SNeilBrown unsigned long flags; 17061da177e4SLinus Torvalds 17071da177e4SLinus Torvalds /* 17081da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1709ddac7c7eSNeilBrown * and mark them readable. 1710ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 1711423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request 1712423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent. 17131da177e4SLinus Torvalds */ 1714423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 17151da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 17163cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 17178c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 17188c7a2c2bSNeilBrown if (repl 17191aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags) 17208c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 17218c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 17228c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 17238c7a2c2bSNeilBrown /* replacement has just become active */ 17248c7a2c2bSNeilBrown if (!rdev || 17258c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 17268c7a2c2bSNeilBrown count++; 17278c7a2c2bSNeilBrown if (rdev) { 17288c7a2c2bSNeilBrown /* Replaced device not technically 17298c7a2c2bSNeilBrown * faulty, but we need to be sure 17308c7a2c2bSNeilBrown * it gets removed and never re-added 17318c7a2c2bSNeilBrown */ 17328c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 17338c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 17348c7a2c2bSNeilBrown rdev->sysfs_state); 17358c7a2c2bSNeilBrown } 17368c7a2c2bSNeilBrown } 1737ddac7c7eSNeilBrown if (rdev 173861e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector 1739ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1740c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 17416b965620SNeilBrown count++; 1742654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 17431da177e4SLinus Torvalds } 17441da177e4SLinus Torvalds } 17456b965620SNeilBrown mddev->degraded -= count; 17466b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 17471da177e4SLinus Torvalds 17481da177e4SLinus Torvalds print_conf(conf); 17496b965620SNeilBrown return count; 17501da177e4SLinus Torvalds } 17511da177e4SLinus Torvalds 1752fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 17531da177e4SLinus Torvalds { 1754e8096360SNeilBrown struct r1conf *conf = mddev->private; 1755199050eaSNeil Brown int err = -EEXIST; 175641158c7eSNeilBrown int mirror = 0; 17570eaf822cSJonathan Brassow struct raid1_info *p; 17586c2fce2eSNeil Brown int first = 0; 175930194636SNeilBrown int last = conf->raid_disks - 1; 17601da177e4SLinus Torvalds 17615389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 17625389042fSNeilBrown return -EBUSY; 17635389042fSNeilBrown 17641501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev)) 17651501efadSDan Williams return -ENXIO; 17661501efadSDan Williams 17676c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 17686c2fce2eSNeil Brown first = last = rdev->raid_disk; 17696c2fce2eSNeil Brown 177070bcecdbSGoldwyn Rodrigues /* 177170bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk 177270bcecdbSGoldwyn Rodrigues * if possible. 177370bcecdbSGoldwyn Rodrigues */ 177470bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 && 177570bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first && 17769e753ba9SShaohua Li rdev->saved_raid_disk < conf->raid_disks && 177770bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL) 177870bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk; 177970bcecdbSGoldwyn Rodrigues 17807ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 17817ef449d1SNeilBrown p = conf->mirrors + mirror; 17827ef449d1SNeilBrown if (!p->rdev) { 17839092c02dSJonathan Brassow if (mddev->gendisk) 17848f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 17858f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 17861da177e4SLinus Torvalds 17871da177e4SLinus Torvalds p->head_position = 0; 17881da177e4SLinus Torvalds rdev->raid_disk = mirror; 1789199050eaSNeil Brown err = 0; 17906aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 17916aea114aSNeilBrown * if this was recently any drive of the array 17926aea114aSNeilBrown */ 17936aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 179441158c7eSNeilBrown conf->fullsync = 1; 1795d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 17961da177e4SLinus Torvalds break; 17971da177e4SLinus Torvalds } 17987ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 17997ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 18007ef449d1SNeilBrown /* Add this device as a replacement */ 18017ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 18027ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 18037ef449d1SNeilBrown rdev->raid_disk = mirror; 18047ef449d1SNeilBrown err = 0; 18057ef449d1SNeilBrown conf->fullsync = 1; 18067ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 18077ef449d1SNeilBrown break; 18087ef449d1SNeilBrown } 18097ef449d1SNeilBrown } 18109092c02dSJonathan Brassow if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) 18118b904b5bSBart Van Assche blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue); 18121da177e4SLinus Torvalds print_conf(conf); 1813199050eaSNeil Brown return err; 18141da177e4SLinus Torvalds } 18151da177e4SLinus Torvalds 1816b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 18171da177e4SLinus Torvalds { 1818e8096360SNeilBrown struct r1conf *conf = mddev->private; 18191da177e4SLinus Torvalds int err = 0; 1820b8321b68SNeilBrown int number = rdev->raid_disk; 18210eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 18221da177e4SLinus Torvalds 1823b014f14cSNeilBrown if (rdev != p->rdev) 1824b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1825b014f14cSNeilBrown 18261da177e4SLinus Torvalds print_conf(conf); 1827b8321b68SNeilBrown if (rdev == p->rdev) { 1828b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 18291da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 18301da177e4SLinus Torvalds err = -EBUSY; 18311da177e4SLinus Torvalds goto abort; 18321da177e4SLinus Torvalds } 1833046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1834dfc70645SNeilBrown * is not possible. 1835dfc70645SNeilBrown */ 1836dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 18375389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1838dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1839dfc70645SNeilBrown err = -EBUSY; 1840dfc70645SNeilBrown goto abort; 1841dfc70645SNeilBrown } 18421da177e4SLinus Torvalds p->rdev = NULL; 1843d787be40SNeilBrown if (!test_bit(RemoveSynchronized, &rdev->flags)) { 1844fbd568a3SPaul E. McKenney synchronize_rcu(); 18451da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 18461da177e4SLinus Torvalds /* lost the race, try later */ 18471da177e4SLinus Torvalds err = -EBUSY; 18481da177e4SLinus Torvalds p->rdev = rdev; 1849ac5e7113SAndre Noll goto abort; 1850d787be40SNeilBrown } 1851d787be40SNeilBrown } 1852d787be40SNeilBrown if (conf->mirrors[conf->raid_disks + number].rdev) { 18538c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 18548c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 18558c7a2c2bSNeilBrown * doing this to avoid confusion. 18568c7a2c2bSNeilBrown */ 18578c7a2c2bSNeilBrown struct md_rdev *repl = 18588c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 1859e2d59925SNeilBrown freeze_array(conf, 0); 18603de59bb9SYufen Yu if (atomic_read(&repl->nr_pending)) { 18613de59bb9SYufen Yu /* It means that some queued IO of retry_list 18623de59bb9SYufen Yu * hold repl. Thus, we cannot set replacement 18633de59bb9SYufen Yu * as NULL, avoiding rdev NULL pointer 18643de59bb9SYufen Yu * dereference in sync_request_write and 18653de59bb9SYufen Yu * handle_write_finished. 18663de59bb9SYufen Yu */ 18673de59bb9SYufen Yu err = -EBUSY; 18683de59bb9SYufen Yu unfreeze_array(conf); 18693de59bb9SYufen Yu goto abort; 18703de59bb9SYufen Yu } 18718c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 18728c7a2c2bSNeilBrown p->rdev = repl; 18738c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 1874e2d59925SNeilBrown unfreeze_array(conf); 1875e5bc9c3cSGuoqing Jiang } 1876e5bc9c3cSGuoqing Jiang 18778c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1878a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 18791da177e4SLinus Torvalds } 18801da177e4SLinus Torvalds abort: 18811da177e4SLinus Torvalds 18821da177e4SLinus Torvalds print_conf(conf); 18831da177e4SLinus Torvalds return err; 18841da177e4SLinus Torvalds } 18851da177e4SLinus Torvalds 18864246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio) 18871da177e4SLinus Torvalds { 188898d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 18891da177e4SLinus Torvalds 18900fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1891ba3ae3beSNamhyung Kim 18921da177e4SLinus Torvalds /* 18931da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 18941da177e4SLinus Torvalds * or re-read if the read failed. 18951da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 18961da177e4SLinus Torvalds */ 18974e4cbee9SChristoph Hellwig if (!bio->bi_status) 18981da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1899d11c171eSNeilBrown 1900d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 19011da177e4SLinus Torvalds reschedule_retry(r1_bio); 19021da177e4SLinus Torvalds } 19031da177e4SLinus Torvalds 1904dfcc34c9SNate Dailey static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio) 1905dfcc34c9SNate Dailey { 1906dfcc34c9SNate Dailey sector_t sync_blocks = 0; 1907dfcc34c9SNate Dailey sector_t s = r1_bio->sector; 1908dfcc34c9SNate Dailey long sectors_to_go = r1_bio->sectors; 1909dfcc34c9SNate Dailey 1910dfcc34c9SNate Dailey /* make sure these bits don't get cleared. */ 1911dfcc34c9SNate Dailey do { 1912dfcc34c9SNate Dailey md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); 1913dfcc34c9SNate Dailey s += sync_blocks; 1914dfcc34c9SNate Dailey sectors_to_go -= sync_blocks; 1915dfcc34c9SNate Dailey } while (sectors_to_go > 0); 1916dfcc34c9SNate Dailey } 1917dfcc34c9SNate Dailey 1918449808a2SHou Tao static void put_sync_write_buf(struct r1bio *r1_bio, int uptodate) 1919449808a2SHou Tao { 1920449808a2SHou Tao if (atomic_dec_and_test(&r1_bio->remaining)) { 1921449808a2SHou Tao struct mddev *mddev = r1_bio->mddev; 1922449808a2SHou Tao int s = r1_bio->sectors; 1923449808a2SHou Tao 1924449808a2SHou Tao if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1925449808a2SHou Tao test_bit(R1BIO_WriteError, &r1_bio->state)) 1926449808a2SHou Tao reschedule_retry(r1_bio); 1927449808a2SHou Tao else { 1928449808a2SHou Tao put_buf(r1_bio); 1929449808a2SHou Tao md_done_sync(mddev, s, uptodate); 1930449808a2SHou Tao } 1931449808a2SHou Tao } 1932449808a2SHou Tao } 1933449808a2SHou Tao 19344246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio) 19351da177e4SLinus Torvalds { 19364e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status; 193798d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 1938fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1939e8096360SNeilBrown struct r1conf *conf = mddev->private; 19404367af55SNeilBrown sector_t first_bad; 19414367af55SNeilBrown int bad_sectors; 1942854abd75SNeilBrown struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; 1943ba3ae3beSNamhyung Kim 19446b1117d5SNeilBrown if (!uptodate) { 1945dfcc34c9SNate Dailey abort_sync_write(mddev, r1_bio); 1946854abd75SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1947854abd75SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 194819d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 194919d67169SNeilBrown mddev->recovery); 1950d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 1951854abd75SNeilBrown } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 19523a9f28a5SNeilBrown &first_bad, &bad_sectors) && 19533a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 19543a9f28a5SNeilBrown r1_bio->sector, 19553a9f28a5SNeilBrown r1_bio->sectors, 19563a9f28a5SNeilBrown &first_bad, &bad_sectors) 19573a9f28a5SNeilBrown ) 19584367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1959e3b9703eSNeilBrown 1960449808a2SHou Tao put_sync_write_buf(r1_bio, uptodate); 19614367af55SNeilBrown } 19621da177e4SLinus Torvalds 19633cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1964d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1965d8f05d29SNeilBrown { 1966796a5cf0SMike Christie if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) 1967d8f05d29SNeilBrown /* success */ 1968d8f05d29SNeilBrown return 1; 196919d67169SNeilBrown if (rw == WRITE) { 1970d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 197119d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 197219d67169SNeilBrown &rdev->flags)) 197319d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 197419d67169SNeilBrown rdev->mddev->recovery); 197519d67169SNeilBrown } 1976d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1977d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1978d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1979d8f05d29SNeilBrown return 0; 1980d8f05d29SNeilBrown } 1981d8f05d29SNeilBrown 19829f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 19831da177e4SLinus Torvalds { 1984a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 198569382e85SNeilBrown * good data, much like with normal read errors. Only 1986ddac7c7eSNeilBrown * read into the pages we already have so we don't 198769382e85SNeilBrown * need to re-issue the read request. 198869382e85SNeilBrown * We don't need to freeze the array, because being in an 198969382e85SNeilBrown * active sync request, there is no normal IO, and 199069382e85SNeilBrown * no overlapping syncs. 199106f60385SNeilBrown * We don't need to check is_badblock() again as we 199206f60385SNeilBrown * made sure that anything with a bad block in range 199306f60385SNeilBrown * will have bi_end_io clear. 19941da177e4SLinus Torvalds */ 1995fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1996e8096360SNeilBrown struct r1conf *conf = mddev->private; 1997a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 199844cf0f4dSMing Lei struct page **pages = get_resync_pages(bio)->pages; 199969382e85SNeilBrown sector_t sect = r1_bio->sector; 200069382e85SNeilBrown int sectors = r1_bio->sectors; 200169382e85SNeilBrown int idx = 0; 20022e52d449SNeilBrown struct md_rdev *rdev; 20032e52d449SNeilBrown 20042e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 20052e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) { 20062e52d449SNeilBrown /* Don't try recovering from here - just fail it 20072e52d449SNeilBrown * ... unless it is the last working device of course */ 20082e52d449SNeilBrown md_error(mddev, rdev); 20092e52d449SNeilBrown if (test_bit(Faulty, &rdev->flags)) 20102e52d449SNeilBrown /* Don't try to read from here, but make sure 20112e52d449SNeilBrown * put_buf does it's thing 20122e52d449SNeilBrown */ 20132e52d449SNeilBrown bio->bi_end_io = end_sync_write; 20142e52d449SNeilBrown } 201569382e85SNeilBrown 201669382e85SNeilBrown while(sectors) { 201769382e85SNeilBrown int s = sectors; 201869382e85SNeilBrown int d = r1_bio->read_disk; 201969382e85SNeilBrown int success = 0; 202078d7f5f7SNeilBrown int start; 202169382e85SNeilBrown 202269382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 202369382e85SNeilBrown s = PAGE_SIZE >> 9; 202469382e85SNeilBrown do { 202569382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 2026ddac7c7eSNeilBrown /* No rcu protection needed here devices 2027ddac7c7eSNeilBrown * can only be removed when no resync is 2028ddac7c7eSNeilBrown * active, and resync is currently active 2029ddac7c7eSNeilBrown */ 203069382e85SNeilBrown rdev = conf->mirrors[d].rdev; 20319d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 203244cf0f4dSMing Lei pages[idx], 2033796a5cf0SMike Christie REQ_OP_READ, 0, false)) { 203469382e85SNeilBrown success = 1; 203569382e85SNeilBrown break; 203669382e85SNeilBrown } 203769382e85SNeilBrown } 203869382e85SNeilBrown d++; 20398f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 204069382e85SNeilBrown d = 0; 204169382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 204269382e85SNeilBrown 204378d7f5f7SNeilBrown if (!success) { 204478d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 20453a9f28a5SNeilBrown int abort = 0; 20463a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 20473a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 20483a9f28a5SNeilBrown * work just disable and interrupt the recovery. 20493a9f28a5SNeilBrown * Don't fail devices as that won't really help. 20503a9f28a5SNeilBrown */ 20511d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 205274d46992SChristoph Hellwig mdname(mddev), bio_devname(bio, b), 205378d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 20548f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 20553a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 20563a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 20573a9f28a5SNeilBrown continue; 20583a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 20593a9f28a5SNeilBrown abort = 1; 20603a9f28a5SNeilBrown } 20613a9f28a5SNeilBrown if (abort) { 2062d890fa2bSNeilBrown conf->recovery_disabled = 2063d890fa2bSNeilBrown mddev->recovery_disabled; 20643a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 206578d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 206678d7f5f7SNeilBrown put_buf(r1_bio); 206778d7f5f7SNeilBrown return 0; 206878d7f5f7SNeilBrown } 20693a9f28a5SNeilBrown /* Try next page */ 20703a9f28a5SNeilBrown sectors -= s; 20713a9f28a5SNeilBrown sect += s; 20723a9f28a5SNeilBrown idx++; 20733a9f28a5SNeilBrown continue; 20743a9f28a5SNeilBrown } 207578d7f5f7SNeilBrown 207678d7f5f7SNeilBrown start = d; 207769382e85SNeilBrown /* write it back and re-read */ 207869382e85SNeilBrown while (d != r1_bio->read_disk) { 207969382e85SNeilBrown if (d == 0) 20808f19ccb2SNeilBrown d = conf->raid_disks * 2; 208169382e85SNeilBrown d--; 208269382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 208369382e85SNeilBrown continue; 208469382e85SNeilBrown rdev = conf->mirrors[d].rdev; 2085d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 208644cf0f4dSMing Lei pages[idx], 2087d8f05d29SNeilBrown WRITE) == 0) { 208878d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 208978d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 20909d3d8011SNamhyung Kim } 2091097426f6SNeilBrown } 2092097426f6SNeilBrown d = start; 2093097426f6SNeilBrown while (d != r1_bio->read_disk) { 2094097426f6SNeilBrown if (d == 0) 20958f19ccb2SNeilBrown d = conf->raid_disks * 2; 2096097426f6SNeilBrown d--; 2097097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 2098097426f6SNeilBrown continue; 2099097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 2100d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 210144cf0f4dSMing Lei pages[idx], 2102d8f05d29SNeilBrown READ) != 0) 21039d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 210469382e85SNeilBrown } 210569382e85SNeilBrown sectors -= s; 210669382e85SNeilBrown sect += s; 210769382e85SNeilBrown idx ++; 210869382e85SNeilBrown } 210978d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 21104e4cbee9SChristoph Hellwig bio->bi_status = 0; 2111a68e5870SNeilBrown return 1; 211269382e85SNeilBrown } 2113d11c171eSNeilBrown 2114c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio) 2115a68e5870SNeilBrown { 2116a68e5870SNeilBrown /* We have read all readable devices. If we haven't 2117a68e5870SNeilBrown * got the block, then there is no hope left. 2118a68e5870SNeilBrown * If we have, then we want to do a comparison 2119a68e5870SNeilBrown * and skip the write if everything is the same. 2120a68e5870SNeilBrown * If any blocks failed to read, then we need to 2121a68e5870SNeilBrown * attempt an over-write 2122a68e5870SNeilBrown */ 2123fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2124e8096360SNeilBrown struct r1conf *conf = mddev->private; 2125a68e5870SNeilBrown int primary; 2126a68e5870SNeilBrown int i; 2127f4380a91Smajianpeng int vcnt; 2128a68e5870SNeilBrown 212930bc9b53SNeilBrown /* Fix variable parts of all bios */ 213030bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 213130bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 21324e4cbee9SChristoph Hellwig blk_status_t status; 213330bc9b53SNeilBrown struct bio *b = r1_bio->bios[i]; 213498d30c58SMing Lei struct resync_pages *rp = get_resync_pages(b); 213530bc9b53SNeilBrown if (b->bi_end_io != end_sync_read) 213630bc9b53SNeilBrown continue; 21374246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */ 21384e4cbee9SChristoph Hellwig status = b->bi_status; 213930bc9b53SNeilBrown bio_reset(b); 21404e4cbee9SChristoph Hellwig b->bi_status = status; 21414f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector + 214230bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset; 214374d46992SChristoph Hellwig bio_set_dev(b, conf->mirrors[i].rdev->bdev); 214430bc9b53SNeilBrown b->bi_end_io = end_sync_read; 214598d30c58SMing Lei rp->raid_bio = r1_bio; 214698d30c58SMing Lei b->bi_private = rp; 214730bc9b53SNeilBrown 2148fb0eb5dfSMing Lei /* initialize bvec table again */ 2149fb0eb5dfSMing Lei md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); 215030bc9b53SNeilBrown } 21518f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 2152a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 21534e4cbee9SChristoph Hellwig !r1_bio->bios[primary]->bi_status) { 2154a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 2155a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 2156a68e5870SNeilBrown break; 2157a68e5870SNeilBrown } 2158a68e5870SNeilBrown r1_bio->read_disk = primary; 21598f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 21602b070cfeSChristoph Hellwig int j = 0; 2161a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 2162a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 21634e4cbee9SChristoph Hellwig blk_status_t status = sbio->bi_status; 216444cf0f4dSMing Lei struct page **ppages = get_resync_pages(pbio)->pages; 216544cf0f4dSMing Lei struct page **spages = get_resync_pages(sbio)->pages; 216660928a91SMing Lei struct bio_vec *bi; 21678fc04e6eSMing Lei int page_len[RESYNC_PAGES] = { 0 }; 21686dc4f100SMing Lei struct bvec_iter_all iter_all; 216978d7f5f7SNeilBrown 21702aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read) 217178d7f5f7SNeilBrown continue; 21724246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */ 21734e4cbee9SChristoph Hellwig sbio->bi_status = 0; 2174a68e5870SNeilBrown 21752b070cfeSChristoph Hellwig bio_for_each_segment_all(bi, sbio, iter_all) 21762b070cfeSChristoph Hellwig page_len[j++] = bi->bv_len; 217760928a91SMing Lei 21784e4cbee9SChristoph Hellwig if (!status) { 2179a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 218044cf0f4dSMing Lei if (memcmp(page_address(ppages[j]), 218144cf0f4dSMing Lei page_address(spages[j]), 218260928a91SMing Lei page_len[j])) 2183a68e5870SNeilBrown break; 2184a68e5870SNeilBrown } 2185a68e5870SNeilBrown } else 2186a68e5870SNeilBrown j = 0; 2187a68e5870SNeilBrown if (j >= 0) 21887f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); 2189a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 21904e4cbee9SChristoph Hellwig && !status)) { 219178d7f5f7SNeilBrown /* No need to write to this device. */ 2192a68e5870SNeilBrown sbio->bi_end_io = NULL; 2193a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 219478d7f5f7SNeilBrown continue; 219578d7f5f7SNeilBrown } 2196d3b45c2aSKent Overstreet 2197d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio); 2198a68e5870SNeilBrown } 2199a68e5870SNeilBrown } 2200a68e5870SNeilBrown 22019f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 2202a68e5870SNeilBrown { 2203e8096360SNeilBrown struct r1conf *conf = mddev->private; 2204a68e5870SNeilBrown int i; 22058f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 2206037d2ff6SGuoqing Jiang struct bio *wbio; 2207a68e5870SNeilBrown 2208a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2209a68e5870SNeilBrown /* ouch - failed to read all of that. */ 2210a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 2211a68e5870SNeilBrown return; 22127ca78d57SNeilBrown 22137ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2214c95e6385SNeilBrown process_checks(r1_bio); 2215c95e6385SNeilBrown 2216d11c171eSNeilBrown /* 2217d11c171eSNeilBrown * schedule writes 2218d11c171eSNeilBrown */ 22191da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 22201da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 22211da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 22223e198f78SNeilBrown if (wbio->bi_end_io == NULL || 22233e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 22243e198f78SNeilBrown (i == r1_bio->read_disk || 22253e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 22261da177e4SLinus Torvalds continue; 2227dfcc34c9SNate Dailey if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) { 2228dfcc34c9SNate Dailey abort_sync_write(mddev, r1_bio); 22290c9d5b12SNeilBrown continue; 2230dfcc34c9SNate Dailey } 22311da177e4SLinus Torvalds 2232796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 2233212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) 2234212e7eb7SNeilBrown wbio->bi_opf |= MD_FAILFAST; 2235212e7eb7SNeilBrown 22363e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 22371da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 2238aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); 2239191ea9b2SNeilBrown 2240ed00aabdSChristoph Hellwig submit_bio_noacct(wbio); 22411da177e4SLinus Torvalds } 22421da177e4SLinus Torvalds 2243449808a2SHou Tao put_sync_write_buf(r1_bio, 1); 22441da177e4SLinus Torvalds } 22451da177e4SLinus Torvalds 22461da177e4SLinus Torvalds /* 22471da177e4SLinus Torvalds * This is a kernel thread which: 22481da177e4SLinus Torvalds * 22491da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 22501da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 2251d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 22521da177e4SLinus Torvalds */ 22531da177e4SLinus Torvalds 2254e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 2255867868fbSNeilBrown sector_t sect, int sectors) 2256867868fbSNeilBrown { 2257fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 2258867868fbSNeilBrown while(sectors) { 2259867868fbSNeilBrown int s = sectors; 2260867868fbSNeilBrown int d = read_disk; 2261867868fbSNeilBrown int success = 0; 2262867868fbSNeilBrown int start; 22633cb03002SNeilBrown struct md_rdev *rdev; 2264867868fbSNeilBrown 2265867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 2266867868fbSNeilBrown s = PAGE_SIZE >> 9; 2267867868fbSNeilBrown 2268867868fbSNeilBrown do { 2269d2eb35acSNeilBrown sector_t first_bad; 2270d2eb35acSNeilBrown int bad_sectors; 2271d2eb35acSNeilBrown 2272707a6a42SNeilBrown rcu_read_lock(); 2273707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2274867868fbSNeilBrown if (rdev && 2275da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 2276da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 2277da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 2278d2eb35acSNeilBrown is_badblock(rdev, sect, s, 2279707a6a42SNeilBrown &first_bad, &bad_sectors) == 0) { 2280707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2281707a6a42SNeilBrown rcu_read_unlock(); 2282707a6a42SNeilBrown if (sync_page_io(rdev, sect, s<<9, 2283796a5cf0SMike Christie conf->tmppage, REQ_OP_READ, 0, false)) 2284867868fbSNeilBrown success = 1; 2285707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2286707a6a42SNeilBrown if (success) 2287707a6a42SNeilBrown break; 2288707a6a42SNeilBrown } else 2289707a6a42SNeilBrown rcu_read_unlock(); 2290867868fbSNeilBrown d++; 22918f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 2292867868fbSNeilBrown d = 0; 2293867868fbSNeilBrown } while (!success && d != read_disk); 2294867868fbSNeilBrown 2295867868fbSNeilBrown if (!success) { 2296d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 22973cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 2298d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 2299d8f05d29SNeilBrown md_error(mddev, rdev); 2300867868fbSNeilBrown break; 2301867868fbSNeilBrown } 2302867868fbSNeilBrown /* write it back and re-read */ 2303867868fbSNeilBrown start = d; 2304867868fbSNeilBrown while (d != read_disk) { 2305867868fbSNeilBrown if (d==0) 23068f19ccb2SNeilBrown d = conf->raid_disks * 2; 2307867868fbSNeilBrown d--; 2308707a6a42SNeilBrown rcu_read_lock(); 2309707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2310867868fbSNeilBrown if (rdev && 2311707a6a42SNeilBrown !test_bit(Faulty, &rdev->flags)) { 2312707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2313707a6a42SNeilBrown rcu_read_unlock(); 2314d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 2315d8f05d29SNeilBrown conf->tmppage, WRITE); 2316707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2317707a6a42SNeilBrown } else 2318707a6a42SNeilBrown rcu_read_unlock(); 2319867868fbSNeilBrown } 2320867868fbSNeilBrown d = start; 2321867868fbSNeilBrown while (d != read_disk) { 2322867868fbSNeilBrown char b[BDEVNAME_SIZE]; 2323867868fbSNeilBrown if (d==0) 23248f19ccb2SNeilBrown d = conf->raid_disks * 2; 2325867868fbSNeilBrown d--; 2326707a6a42SNeilBrown rcu_read_lock(); 2327707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2328867868fbSNeilBrown if (rdev && 2329b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) { 2330707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2331707a6a42SNeilBrown rcu_read_unlock(); 2332d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 2333d8f05d29SNeilBrown conf->tmppage, READ)) { 2334867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 23351d41c216SNeilBrown pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", 2336867868fbSNeilBrown mdname(mddev), s, 2337969b755aSRandy Dunlap (unsigned long long)(sect + 2338969b755aSRandy Dunlap rdev->data_offset), 2339867868fbSNeilBrown bdevname(rdev->bdev, b)); 2340867868fbSNeilBrown } 2341707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2342707a6a42SNeilBrown } else 2343707a6a42SNeilBrown rcu_read_unlock(); 2344867868fbSNeilBrown } 2345867868fbSNeilBrown sectors -= s; 2346867868fbSNeilBrown sect += s; 2347867868fbSNeilBrown } 2348867868fbSNeilBrown } 2349867868fbSNeilBrown 23509f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2351cd5ff9a1SNeilBrown { 2352fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2353e8096360SNeilBrown struct r1conf *conf = mddev->private; 23543cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2355cd5ff9a1SNeilBrown 2356cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2357cd5ff9a1SNeilBrown * we just recently had a write error. 2358cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2359cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2360cd5ff9a1SNeilBrown * a bad block. 2361cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2362cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2363cd5ff9a1SNeilBrown * 2364cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2365cd5ff9a1SNeilBrown */ 2366cd5ff9a1SNeilBrown 2367cd5ff9a1SNeilBrown int block_sectors; 2368cd5ff9a1SNeilBrown sector_t sector; 2369cd5ff9a1SNeilBrown int sectors; 2370cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2371cd5ff9a1SNeilBrown int ok = 1; 2372cd5ff9a1SNeilBrown 2373cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2374cd5ff9a1SNeilBrown return 0; 2375cd5ff9a1SNeilBrown 2376ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift, 2377ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9); 2378cd5ff9a1SNeilBrown sector = r1_bio->sector; 2379cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2380cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2381cd5ff9a1SNeilBrown - sector; 2382cd5ff9a1SNeilBrown 2383cd5ff9a1SNeilBrown while (sect_to_write) { 2384cd5ff9a1SNeilBrown struct bio *wbio; 2385cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2386cd5ff9a1SNeilBrown sectors = sect_to_write; 2387cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2388cd5ff9a1SNeilBrown 2389b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2390841c1316SMing Lei wbio = bio_clone_fast(r1_bio->behind_master_bio, 2391841c1316SMing Lei GFP_NOIO, 2392afeee514SKent Overstreet &mddev->bio_set); 2393b783863fSKent Overstreet } else { 2394d7a10308SMing Lei wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, 2395afeee514SKent Overstreet &mddev->bio_set); 2396b783863fSKent Overstreet } 2397b783863fSKent Overstreet 2398796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 23994f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector; 24004f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9; 2401cd5ff9a1SNeilBrown 24026678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors); 24034f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset; 240474d46992SChristoph Hellwig bio_set_dev(wbio, rdev->bdev); 24054e49ea4aSMike Christie 24064e49ea4aSMike Christie if (submit_bio_wait(wbio) < 0) 2407cd5ff9a1SNeilBrown /* failure! */ 2408cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2409cd5ff9a1SNeilBrown sectors, 0) 2410cd5ff9a1SNeilBrown && ok; 2411cd5ff9a1SNeilBrown 2412cd5ff9a1SNeilBrown bio_put(wbio); 2413cd5ff9a1SNeilBrown sect_to_write -= sectors; 2414cd5ff9a1SNeilBrown sector += sectors; 2415cd5ff9a1SNeilBrown sectors = block_sectors; 2416cd5ff9a1SNeilBrown } 2417cd5ff9a1SNeilBrown return ok; 2418cd5ff9a1SNeilBrown } 2419cd5ff9a1SNeilBrown 2420e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 242162096bceSNeilBrown { 242262096bceSNeilBrown int m; 242362096bceSNeilBrown int s = r1_bio->sectors; 24248f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 24253cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 242662096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 242762096bceSNeilBrown if (bio->bi_end_io == NULL) 242862096bceSNeilBrown continue; 24294e4cbee9SChristoph Hellwig if (!bio->bi_status && 243062096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2431c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 243262096bceSNeilBrown } 24334e4cbee9SChristoph Hellwig if (bio->bi_status && 243462096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 243562096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 243662096bceSNeilBrown md_error(conf->mddev, rdev); 243762096bceSNeilBrown } 243862096bceSNeilBrown } 243962096bceSNeilBrown put_buf(r1_bio); 244062096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 244162096bceSNeilBrown } 244262096bceSNeilBrown 2443e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 244462096bceSNeilBrown { 2445fd76863eScolyli@suse.de int m, idx; 244655ce74d4SNeilBrown bool fail = false; 2447fd76863eScolyli@suse.de 24488f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 244962096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 24503cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 245162096bceSNeilBrown rdev_clear_badblocks(rdev, 245262096bceSNeilBrown r1_bio->sector, 2453c6563a8cSNeilBrown r1_bio->sectors, 0); 245462096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 245562096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 245662096bceSNeilBrown /* This drive got a write error. We need to 245762096bceSNeilBrown * narrow down and record precise write 245862096bceSNeilBrown * errors. 245962096bceSNeilBrown */ 246055ce74d4SNeilBrown fail = true; 246162096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 246262096bceSNeilBrown md_error(conf->mddev, 246362096bceSNeilBrown conf->mirrors[m].rdev); 246462096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 246562096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 246662096bceSNeilBrown } 246762096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 246862096bceSNeilBrown conf->mddev); 246962096bceSNeilBrown } 247055ce74d4SNeilBrown if (fail) { 247155ce74d4SNeilBrown spin_lock_irq(&conf->device_lock); 247255ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list); 2473fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2474824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 247555ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock); 2476824e47daScolyli@suse.de /* 2477824e47daScolyli@suse.de * In case freeze_array() is waiting for condition 2478824e47daScolyli@suse.de * get_unqueued_pending() == extra to be true. 2479824e47daScolyli@suse.de */ 2480824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 248155ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread); 2482bd8688a1SNeilBrown } else { 2483bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2484bd8688a1SNeilBrown close_write(r1_bio); 248562096bceSNeilBrown raid_end_bio_io(r1_bio); 248662096bceSNeilBrown } 2487bd8688a1SNeilBrown } 248862096bceSNeilBrown 2489e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 249062096bceSNeilBrown { 2491fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 249262096bceSNeilBrown struct bio *bio; 24933cb03002SNeilBrown struct md_rdev *rdev; 249462096bceSNeilBrown 249562096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 249662096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 249762096bceSNeilBrown * the block and we can fix it. 249862096bceSNeilBrown * We freeze all other IO, and try reading the block from 249962096bceSNeilBrown * other devices. When we find one, we re-write 250062096bceSNeilBrown * and check it that fixes the read error. 250162096bceSNeilBrown * This is all done synchronously while the array is 250262096bceSNeilBrown * frozen 250362096bceSNeilBrown */ 25047449f699STomasz Majchrzak 25057449f699STomasz Majchrzak bio = r1_bio->bios[r1_bio->read_disk]; 25067449f699STomasz Majchrzak bio_put(bio); 25077449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = NULL; 25087449f699STomasz Majchrzak 25092e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 25102e52d449SNeilBrown if (mddev->ro == 0 25112e52d449SNeilBrown && !test_bit(FailFast, &rdev->flags)) { 2512e2d59925SNeilBrown freeze_array(conf, 1); 251362096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 251462096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 251562096bceSNeilBrown unfreeze_array(conf); 2516b33d1062SGioh Kim } else if (mddev->ro == 0 && test_bit(FailFast, &rdev->flags)) { 2517b33d1062SGioh Kim md_error(mddev, rdev); 25187449f699STomasz Majchrzak } else { 25197449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; 25207449f699STomasz Majchrzak } 25217449f699STomasz Majchrzak 25222e52d449SNeilBrown rdev_dec_pending(rdev, conf->mddev); 2523689389a0SNeilBrown allow_barrier(conf, r1_bio->sector); 2524689389a0SNeilBrown bio = r1_bio->master_bio; 252562096bceSNeilBrown 2526689389a0SNeilBrown /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ 2527689389a0SNeilBrown r1_bio->state = 0; 2528689389a0SNeilBrown raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); 2529109e3765SNeilBrown } 253062096bceSNeilBrown 25314ed8731dSShaohua Li static void raid1d(struct md_thread *thread) 25321da177e4SLinus Torvalds { 25334ed8731dSShaohua Li struct mddev *mddev = thread->mddev; 25349f2c9d12SNeilBrown struct r1bio *r1_bio; 25351da177e4SLinus Torvalds unsigned long flags; 2536e8096360SNeilBrown struct r1conf *conf = mddev->private; 25371da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2538e1dfa0a2SNeilBrown struct blk_plug plug; 2539fd76863eScolyli@suse.de int idx; 25401da177e4SLinus Torvalds 25411da177e4SLinus Torvalds md_check_recovery(mddev); 25421da177e4SLinus Torvalds 254355ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) && 25442953079cSShaohua Li !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { 254555ce74d4SNeilBrown LIST_HEAD(tmp); 254655ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 2547fd76863eScolyli@suse.de if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 2548fd76863eScolyli@suse.de list_splice_init(&conf->bio_end_io_list, &tmp); 254955ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 255055ce74d4SNeilBrown while (!list_empty(&tmp)) { 2551a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio, 2552a452744bSMikulas Patocka retry_list); 255355ce74d4SNeilBrown list_del(&r1_bio->retry_list); 2554fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2555824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 2556bd8688a1SNeilBrown if (mddev->degraded) 2557bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 2558bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2559bd8688a1SNeilBrown close_write(r1_bio); 256055ce74d4SNeilBrown raid_end_bio_io(r1_bio); 256155ce74d4SNeilBrown } 256255ce74d4SNeilBrown } 256355ce74d4SNeilBrown 2564e1dfa0a2SNeilBrown blk_start_plug(&plug); 25651da177e4SLinus Torvalds for (;;) { 2566a35e63efSNeilBrown 25677eaceaccSJens Axboe flush_pending_writes(conf); 2568a35e63efSNeilBrown 25691da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2570a35e63efSNeilBrown if (list_empty(head)) { 2571191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 25721da177e4SLinus Torvalds break; 2573a35e63efSNeilBrown } 25749f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 25751da177e4SLinus Torvalds list_del(head->prev); 2576fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2577824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 25781da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 25791da177e4SLinus Torvalds 25801da177e4SLinus Torvalds mddev = r1_bio->mddev; 2581070ec55dSNeilBrown conf = mddev->private; 25824367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2583d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 258462096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 258562096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 258662096bceSNeilBrown else 25871da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2588cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 258962096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 259062096bceSNeilBrown handle_write_finished(conf, r1_bio); 259162096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 259262096bceSNeilBrown handle_read_error(conf, r1_bio); 2593d2eb35acSNeilBrown else 2594c230e7e5SNeilBrown WARN_ON_ONCE(1); 259562096bceSNeilBrown 25961d9d5241SNeilBrown cond_resched(); 25972953079cSShaohua Li if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) 2598de393cdeSNeilBrown md_check_recovery(mddev); 25991da177e4SLinus Torvalds } 2600e1dfa0a2SNeilBrown blk_finish_plug(&plug); 26011da177e4SLinus Torvalds } 26021da177e4SLinus Torvalds 2603e8096360SNeilBrown static int init_resync(struct r1conf *conf) 26041da177e4SLinus Torvalds { 26051da177e4SLinus Torvalds int buffs; 26061da177e4SLinus Torvalds 26071da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 2608afeee514SKent Overstreet BUG_ON(mempool_initialized(&conf->r1buf_pool)); 2609afeee514SKent Overstreet 2610afeee514SKent Overstreet return mempool_init(&conf->r1buf_pool, buffs, r1buf_pool_alloc, 2611afeee514SKent Overstreet r1buf_pool_free, conf->poolinfo); 26121da177e4SLinus Torvalds } 26131da177e4SLinus Torvalds 2614208410b5SShaohua Li static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) 2615208410b5SShaohua Li { 2616afeee514SKent Overstreet struct r1bio *r1bio = mempool_alloc(&conf->r1buf_pool, GFP_NOIO); 2617208410b5SShaohua Li struct resync_pages *rps; 2618208410b5SShaohua Li struct bio *bio; 2619208410b5SShaohua Li int i; 2620208410b5SShaohua Li 2621208410b5SShaohua Li for (i = conf->poolinfo->raid_disks; i--; ) { 2622208410b5SShaohua Li bio = r1bio->bios[i]; 2623208410b5SShaohua Li rps = bio->bi_private; 2624208410b5SShaohua Li bio_reset(bio); 2625208410b5SShaohua Li bio->bi_private = rps; 2626208410b5SShaohua Li } 2627208410b5SShaohua Li r1bio->master_bio = NULL; 2628208410b5SShaohua Li return r1bio; 2629208410b5SShaohua Li } 2630208410b5SShaohua Li 26311da177e4SLinus Torvalds /* 26321da177e4SLinus Torvalds * perform a "sync" on one "block" 26331da177e4SLinus Torvalds * 26341da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 26351da177e4SLinus Torvalds * requests - conflict with active sync requests. 26361da177e4SLinus Torvalds * 26371da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 26381da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 26391da177e4SLinus Torvalds */ 26401da177e4SLinus Torvalds 2641849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 2642849674e4SShaohua Li int *skipped) 26431da177e4SLinus Torvalds { 2644e8096360SNeilBrown struct r1conf *conf = mddev->private; 26459f2c9d12SNeilBrown struct r1bio *r1_bio; 26461da177e4SLinus Torvalds struct bio *bio; 26471da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 26483e198f78SNeilBrown int disk = -1; 26491da177e4SLinus Torvalds int i; 26503e198f78SNeilBrown int wonly = -1; 26513e198f78SNeilBrown int write_targets = 0, read_targets = 0; 265257dab0bdSNeilBrown sector_t sync_blocks; 2653e3b9703eSNeilBrown int still_degraded = 0; 265406f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 265506f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 2656fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 2657022e510fSMing Lei int page_idx = 0; 26581da177e4SLinus Torvalds 2659afeee514SKent Overstreet if (!mempool_initialized(&conf->r1buf_pool)) 26601da177e4SLinus Torvalds if (init_resync(conf)) 266157afd89fSNeilBrown return 0; 26621da177e4SLinus Torvalds 266358c0fed4SAndre Noll max_sector = mddev->dev_sectors; 26641da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2665191ea9b2SNeilBrown /* If we aborted, we need to abort the 2666191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2667191ea9b2SNeilBrown * only be one in raid1 resync. 2668191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2669191ea9b2SNeilBrown */ 26706a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 2671e64e4018SAndy Shevchenko md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2672191ea9b2SNeilBrown &sync_blocks, 1); 26736a806c51SNeilBrown else /* completed sync */ 2674191ea9b2SNeilBrown conf->fullsync = 0; 26756a806c51SNeilBrown 2676e64e4018SAndy Shevchenko md_bitmap_close_sync(mddev->bitmap); 26771da177e4SLinus Torvalds close_sync(conf); 2678c40f341fSGoldwyn Rodrigues 2679c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) { 2680c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0; 2681c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0; 2682c40f341fSGoldwyn Rodrigues } 26831da177e4SLinus Torvalds return 0; 26841da177e4SLinus Torvalds } 26851da177e4SLinus Torvalds 268607d84d10SNeilBrown if (mddev->bitmap == NULL && 268707d84d10SNeilBrown mddev->recovery_cp == MaxSector && 26886394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 268907d84d10SNeilBrown conf->fullsync == 0) { 269007d84d10SNeilBrown *skipped = 1; 269107d84d10SNeilBrown return max_sector - sector_nr; 269207d84d10SNeilBrown } 26936394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 26946394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 26956394cca5SNeilBrown */ 2696e64e4018SAndy Shevchenko if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2697e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2698191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2699191ea9b2SNeilBrown *skipped = 1; 2700191ea9b2SNeilBrown return sync_blocks; 2701191ea9b2SNeilBrown } 270217999be4SNeilBrown 27037ac50447STomasz Majchrzak /* 27047ac50447STomasz Majchrzak * If there is non-resync activity waiting for a turn, then let it 27057ac50447STomasz Majchrzak * though before starting on this new sync request. 27067ac50447STomasz Majchrzak */ 2707824e47daScolyli@suse.de if (atomic_read(&conf->nr_waiting[idx])) 27087ac50447STomasz Majchrzak schedule_timeout_uninterruptible(1); 27097ac50447STomasz Majchrzak 2710c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against 2711c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS 2712c40f341fSGoldwyn Rodrigues */ 2713c40f341fSGoldwyn Rodrigues 2714e64e4018SAndy Shevchenko md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, 2715c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); 271617999be4SNeilBrown 27178c242593SYufen Yu 27188c242593SYufen Yu if (raise_barrier(conf, sector_nr)) 27198c242593SYufen Yu return 0; 27208c242593SYufen Yu 27218c242593SYufen Yu r1_bio = raid1_alloc_init_r1buf(conf); 27221da177e4SLinus Torvalds 27233e198f78SNeilBrown rcu_read_lock(); 27243e198f78SNeilBrown /* 27253e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 27263e198f78SNeilBrown * we might want to read from a different device. So we 27273e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 27283e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 27293e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 27303e198f78SNeilBrown * is OK. 27313e198f78SNeilBrown */ 27321da177e4SLinus Torvalds 27331da177e4SLinus Torvalds r1_bio->mddev = mddev; 27341da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2735191ea9b2SNeilBrown r1_bio->state = 0; 27361da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 2737fd76863eScolyli@suse.de /* make sure good_sectors won't go across barrier unit boundary */ 2738fd76863eScolyli@suse.de good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); 27391da177e4SLinus Torvalds 27408f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 27413cb03002SNeilBrown struct md_rdev *rdev; 27421da177e4SLinus Torvalds bio = r1_bio->bios[i]; 27431da177e4SLinus Torvalds 27443e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 27453e198f78SNeilBrown if (rdev == NULL || 27463e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 27478f19ccb2SNeilBrown if (i < conf->raid_disks) 2748e3b9703eSNeilBrown still_degraded = 1; 27493e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 2750796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 27511da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 27521da177e4SLinus Torvalds write_targets ++; 27533e198f78SNeilBrown } else { 27543e198f78SNeilBrown /* may need to read from here */ 275506f60385SNeilBrown sector_t first_bad = MaxSector; 275606f60385SNeilBrown int bad_sectors; 275706f60385SNeilBrown 275806f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 275906f60385SNeilBrown &first_bad, &bad_sectors)) { 276006f60385SNeilBrown if (first_bad > sector_nr) 276106f60385SNeilBrown good_sectors = first_bad - sector_nr; 276206f60385SNeilBrown else { 276306f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 276406f60385SNeilBrown if (min_bad == 0 || 276506f60385SNeilBrown min_bad > bad_sectors) 276606f60385SNeilBrown min_bad = bad_sectors; 276706f60385SNeilBrown } 276806f60385SNeilBrown } 276906f60385SNeilBrown if (sector_nr < first_bad) { 27703e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 27713e198f78SNeilBrown if (wonly < 0) 27723e198f78SNeilBrown wonly = i; 27733e198f78SNeilBrown } else { 27743e198f78SNeilBrown if (disk < 0) 27753e198f78SNeilBrown disk = i; 27763e198f78SNeilBrown } 2777796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, 0); 277806f60385SNeilBrown bio->bi_end_io = end_sync_read; 27793e198f78SNeilBrown read_targets++; 2780d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) && 2781d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 2782d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 2783d57368afSAlexander Lyakas /* 2784d57368afSAlexander Lyakas * The device is suitable for reading (InSync), 2785d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them, 2786d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave 2787d57368afSAlexander Lyakas * this device alone for this sync request. 2788d57368afSAlexander Lyakas */ 2789796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 2790d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write; 2791d57368afSAlexander Lyakas write_targets++; 27923e198f78SNeilBrown } 279306f60385SNeilBrown } 2794028288dfSZhiqiang Liu if (rdev && bio->bi_end_io) { 27953e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 27964f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; 279774d46992SChristoph Hellwig bio_set_dev(bio, rdev->bdev); 27982e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) 27992e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 28001da177e4SLinus Torvalds } 280106f60385SNeilBrown } 28023e198f78SNeilBrown rcu_read_unlock(); 28033e198f78SNeilBrown if (disk < 0) 28043e198f78SNeilBrown disk = wonly; 28053e198f78SNeilBrown r1_bio->read_disk = disk; 2806191ea9b2SNeilBrown 280706f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 280806f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 280906f60385SNeilBrown * need to mark them bad on all write targets 281006f60385SNeilBrown */ 281106f60385SNeilBrown int ok = 1; 28128f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 281306f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2814a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 281506f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 281606f60385SNeilBrown min_bad, 0 281706f60385SNeilBrown ) && ok; 281806f60385SNeilBrown } 28192953079cSShaohua Li set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 282006f60385SNeilBrown *skipped = 1; 282106f60385SNeilBrown put_buf(r1_bio); 282206f60385SNeilBrown 282306f60385SNeilBrown if (!ok) { 282406f60385SNeilBrown /* Cannot record the badblocks, so need to 282506f60385SNeilBrown * abort the resync. 282606f60385SNeilBrown * If there are multiple read targets, could just 282706f60385SNeilBrown * fail the really bad ones ??? 282806f60385SNeilBrown */ 282906f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 283006f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 283106f60385SNeilBrown return 0; 283206f60385SNeilBrown } else 283306f60385SNeilBrown return min_bad; 283406f60385SNeilBrown 283506f60385SNeilBrown } 283606f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 283706f60385SNeilBrown /* only resync enough to reach the next bad->good 283806f60385SNeilBrown * transition */ 283906f60385SNeilBrown good_sectors = min_bad; 284006f60385SNeilBrown } 284106f60385SNeilBrown 28423e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 28433e198f78SNeilBrown /* extra read targets are also write targets */ 28443e198f78SNeilBrown write_targets += read_targets-1; 28453e198f78SNeilBrown 28463e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 28471da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 28481da177e4SLinus Torvalds * drives must be failed - so we are finished 28491da177e4SLinus Torvalds */ 2850b7219ccbSNeilBrown sector_t rv; 2851b7219ccbSNeilBrown if (min_bad > 0) 2852b7219ccbSNeilBrown max_sector = sector_nr + min_bad; 2853b7219ccbSNeilBrown rv = max_sector - sector_nr; 285457afd89fSNeilBrown *skipped = 1; 28551da177e4SLinus Torvalds put_buf(r1_bio); 28561da177e4SLinus Torvalds return rv; 28571da177e4SLinus Torvalds } 28581da177e4SLinus Torvalds 2859c6207277SNeilBrown if (max_sector > mddev->resync_max) 2860c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 286106f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 286206f60385SNeilBrown max_sector = sector_nr + good_sectors; 28631da177e4SLinus Torvalds nr_sectors = 0; 2864289e99e8SNeilBrown sync_blocks = 0; 28651da177e4SLinus Torvalds do { 28661da177e4SLinus Torvalds struct page *page; 28671da177e4SLinus Torvalds int len = PAGE_SIZE; 28681da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 28691da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 28701da177e4SLinus Torvalds if (len == 0) 28711da177e4SLinus Torvalds break; 2872ab7a30c7SNeilBrown if (sync_blocks == 0) { 2873e64e4018SAndy Shevchenko if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, 2874e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2875e5de485fSNeilBrown !conf->fullsync && 2876e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2877191ea9b2SNeilBrown break; 28787571ae88SNeilBrown if ((len >> 9) > sync_blocks) 28796a806c51SNeilBrown len = sync_blocks<<9; 2880ab7a30c7SNeilBrown } 2881191ea9b2SNeilBrown 28828f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 288398d30c58SMing Lei struct resync_pages *rp; 288498d30c58SMing Lei 28851da177e4SLinus Torvalds bio = r1_bio->bios[i]; 288698d30c58SMing Lei rp = get_resync_pages(bio); 28871da177e4SLinus Torvalds if (bio->bi_end_io) { 2888022e510fSMing Lei page = resync_fetch_page(rp, page_idx); 2889c85ba149SMing Lei 2890c85ba149SMing Lei /* 2891c85ba149SMing Lei * won't fail because the vec table is big 2892c85ba149SMing Lei * enough to hold all these pages 2893c85ba149SMing Lei */ 2894c85ba149SMing Lei bio_add_page(bio, page, len, 0); 28951da177e4SLinus Torvalds } 28961da177e4SLinus Torvalds } 28971da177e4SLinus Torvalds nr_sectors += len>>9; 28981da177e4SLinus Torvalds sector_nr += len>>9; 2899191ea9b2SNeilBrown sync_blocks -= (len>>9); 2900022e510fSMing Lei } while (++page_idx < RESYNC_PAGES); 290198d30c58SMing Lei 29021da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 29031da177e4SLinus Torvalds 2904c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) && 2905c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) { 2906c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed; 2907c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; 2908c40f341fSGoldwyn Rodrigues /* Send resync message */ 2909c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev, 2910c40f341fSGoldwyn Rodrigues conf->cluster_sync_low, 2911c40f341fSGoldwyn Rodrigues conf->cluster_sync_high); 2912c40f341fSGoldwyn Rodrigues } 2913c40f341fSGoldwyn Rodrigues 2914d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2915d11c171eSNeilBrown * compare 2916d11c171eSNeilBrown */ 2917d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2918d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 29192d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2920d11c171eSNeilBrown bio = r1_bio->bios[i]; 2921d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 29222d4f4f33SNeilBrown read_targets--; 292374d46992SChristoph Hellwig md_sync_acct_bio(bio, nr_sectors); 29242e52d449SNeilBrown if (read_targets == 1) 29252e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2926ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 2927d11c171eSNeilBrown } 2928d11c171eSNeilBrown } 2929d11c171eSNeilBrown } else { 2930d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2931d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 293274d46992SChristoph Hellwig md_sync_acct_bio(bio, nr_sectors); 29332e52d449SNeilBrown if (read_targets == 1) 29342e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2935ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 2936d11c171eSNeilBrown } 29371da177e4SLinus Torvalds return nr_sectors; 29381da177e4SLinus Torvalds } 29391da177e4SLinus Torvalds 2940fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 294180c3a6ceSDan Williams { 294280c3a6ceSDan Williams if (sectors) 294380c3a6ceSDan Williams return sectors; 294480c3a6ceSDan Williams 294580c3a6ceSDan Williams return mddev->dev_sectors; 294680c3a6ceSDan Williams } 294780c3a6ceSDan Williams 2948e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 29491da177e4SLinus Torvalds { 2950e8096360SNeilBrown struct r1conf *conf; 2951709ae487SNeilBrown int i; 29520eaf822cSJonathan Brassow struct raid1_info *disk; 29533cb03002SNeilBrown struct md_rdev *rdev; 2954709ae487SNeilBrown int err = -ENOMEM; 29551da177e4SLinus Torvalds 2956e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 29571da177e4SLinus Torvalds if (!conf) 2958709ae487SNeilBrown goto abort; 29591da177e4SLinus Torvalds 2960fd76863eScolyli@suse.de conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, 2961824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2962fd76863eScolyli@suse.de if (!conf->nr_pending) 2963fd76863eScolyli@suse.de goto abort; 2964fd76863eScolyli@suse.de 2965fd76863eScolyli@suse.de conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, 2966824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2967fd76863eScolyli@suse.de if (!conf->nr_waiting) 2968fd76863eScolyli@suse.de goto abort; 2969fd76863eScolyli@suse.de 2970fd76863eScolyli@suse.de conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, 2971824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2972fd76863eScolyli@suse.de if (!conf->nr_queued) 2973fd76863eScolyli@suse.de goto abort; 2974fd76863eScolyli@suse.de 2975fd76863eScolyli@suse.de conf->barrier = kcalloc(BARRIER_BUCKETS_NR, 2976824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2977fd76863eScolyli@suse.de if (!conf->barrier) 2978fd76863eScolyli@suse.de goto abort; 2979fd76863eScolyli@suse.de 29806396bb22SKees Cook conf->mirrors = kzalloc(array3_size(sizeof(struct raid1_info), 29816396bb22SKees Cook mddev->raid_disks, 2), 29821da177e4SLinus Torvalds GFP_KERNEL); 29831da177e4SLinus Torvalds if (!conf->mirrors) 2984709ae487SNeilBrown goto abort; 29851da177e4SLinus Torvalds 2986ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2987ddaf22abSNeilBrown if (!conf->tmppage) 2988709ae487SNeilBrown goto abort; 2989ddaf22abSNeilBrown 2990709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 29911da177e4SLinus Torvalds if (!conf->poolinfo) 2992709ae487SNeilBrown goto abort; 29938f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 29943f677f9cSMarcos Paulo de Souza err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc, 2995c7afa803SMarcos Paulo de Souza rbio_pool_free, conf->poolinfo); 2996afeee514SKent Overstreet if (err) 2997709ae487SNeilBrown goto abort; 2998709ae487SNeilBrown 2999afeee514SKent Overstreet err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); 3000afeee514SKent Overstreet if (err) 3001c230e7e5SNeilBrown goto abort; 3002c230e7e5SNeilBrown 3003ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 30041da177e4SLinus Torvalds 3005c19d5798SNeilBrown err = -EINVAL; 3006e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 3007dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 3008709ae487SNeilBrown int disk_idx = rdev->raid_disk; 30091da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 30101da177e4SLinus Torvalds || disk_idx < 0) 30111da177e4SLinus Torvalds continue; 3012c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 301302b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx; 3014c19d5798SNeilBrown else 30151da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 30161da177e4SLinus Torvalds 3017c19d5798SNeilBrown if (disk->rdev) 3018c19d5798SNeilBrown goto abort; 30191da177e4SLinus Torvalds disk->rdev = rdev; 30201da177e4SLinus Torvalds disk->head_position = 0; 302112cee5a8SShaohua Li disk->seq_start = MaxSector; 30221da177e4SLinus Torvalds } 30231da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 30241da177e4SLinus Torvalds conf->mddev = mddev; 30251da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 302655ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list); 30271da177e4SLinus Torvalds 30281da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 302917999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 30301da177e4SLinus Torvalds 3031191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 303234db0cd6SNeilBrown conf->pending_count = 0; 3033d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 3034191ea9b2SNeilBrown 3035c19d5798SNeilBrown err = -EIO; 30368f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 30371da177e4SLinus Torvalds 30381da177e4SLinus Torvalds disk = conf->mirrors + i; 30391da177e4SLinus Torvalds 3040c19d5798SNeilBrown if (i < conf->raid_disks && 3041c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 3042c19d5798SNeilBrown /* This slot has a replacement. */ 3043c19d5798SNeilBrown if (!disk->rdev) { 3044c19d5798SNeilBrown /* No original, just make the replacement 3045c19d5798SNeilBrown * a recovering spare 3046c19d5798SNeilBrown */ 3047c19d5798SNeilBrown disk->rdev = 3048c19d5798SNeilBrown disk[conf->raid_disks].rdev; 3049c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 3050c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 3051c19d5798SNeilBrown /* Original is not in_sync - bad */ 3052c19d5798SNeilBrown goto abort; 3053c19d5798SNeilBrown } 3054c19d5798SNeilBrown 30555fd6c1dcSNeilBrown if (!disk->rdev || 30565fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 30571da177e4SLinus Torvalds disk->head_position = 0; 30584f0a5e01SJonathan Brassow if (disk->rdev && 30594f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 306017571284SNeilBrown conf->fullsync = 1; 3061be4d3280SShaohua Li } 30621da177e4SLinus Torvalds } 3063709ae487SNeilBrown 3064709ae487SNeilBrown err = -ENOMEM; 30650232605dSNeilBrown conf->thread = md_register_thread(raid1d, mddev, "raid1"); 30661d41c216SNeilBrown if (!conf->thread) 3067709ae487SNeilBrown goto abort; 3068191ea9b2SNeilBrown 3069709ae487SNeilBrown return conf; 3070709ae487SNeilBrown 3071709ae487SNeilBrown abort: 3072709ae487SNeilBrown if (conf) { 3073afeee514SKent Overstreet mempool_exit(&conf->r1bio_pool); 3074709ae487SNeilBrown kfree(conf->mirrors); 3075709ae487SNeilBrown safe_put_page(conf->tmppage); 3076709ae487SNeilBrown kfree(conf->poolinfo); 3077fd76863eScolyli@suse.de kfree(conf->nr_pending); 3078fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3079fd76863eScolyli@suse.de kfree(conf->nr_queued); 3080fd76863eScolyli@suse.de kfree(conf->barrier); 3081afeee514SKent Overstreet bioset_exit(&conf->bio_split); 3082709ae487SNeilBrown kfree(conf); 3083709ae487SNeilBrown } 3084709ae487SNeilBrown return ERR_PTR(err); 3085709ae487SNeilBrown } 3086709ae487SNeilBrown 3087afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv); 3088849674e4SShaohua Li static int raid1_run(struct mddev *mddev) 3089709ae487SNeilBrown { 3090e8096360SNeilBrown struct r1conf *conf; 3091709ae487SNeilBrown int i; 30923cb03002SNeilBrown struct md_rdev *rdev; 30935220ea1eSmajianpeng int ret; 30942ff8cc2cSShaohua Li bool discard_supported = false; 3095709ae487SNeilBrown 3096709ae487SNeilBrown if (mddev->level != 1) { 30971d41c216SNeilBrown pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", 3098709ae487SNeilBrown mdname(mddev), mddev->level); 3099709ae487SNeilBrown return -EIO; 3100709ae487SNeilBrown } 3101709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 31021d41c216SNeilBrown pr_warn("md/raid1:%s: reshape_position set but not supported\n", 3103709ae487SNeilBrown mdname(mddev)); 3104709ae487SNeilBrown return -EIO; 3105709ae487SNeilBrown } 3106a415c0f1SNeilBrown if (mddev_init_writes_pending(mddev) < 0) 3107a415c0f1SNeilBrown return -ENOMEM; 3108709ae487SNeilBrown /* 3109709ae487SNeilBrown * copy the already verified devices into our private RAID1 3110709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 3111afa0f557SNeilBrown * should be freed in raid1_free()] 3112709ae487SNeilBrown */ 3113709ae487SNeilBrown if (mddev->private == NULL) 3114709ae487SNeilBrown conf = setup_conf(mddev); 3115709ae487SNeilBrown else 3116709ae487SNeilBrown conf = mddev->private; 3117709ae487SNeilBrown 3118709ae487SNeilBrown if (IS_ERR(conf)) 3119709ae487SNeilBrown return PTR_ERR(conf); 3120709ae487SNeilBrown 31213deff1a7SChristoph Hellwig if (mddev->queue) { 31225026d7a9SH. Peter Anvin blk_queue_max_write_same_sectors(mddev->queue, 0); 31233deff1a7SChristoph Hellwig blk_queue_max_write_zeroes_sectors(mddev->queue, 0); 31243deff1a7SChristoph Hellwig } 31255026d7a9SH. Peter Anvin 3126dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 31271ed7242eSJonathan Brassow if (!mddev->gendisk) 31281ed7242eSJonathan Brassow continue; 3129709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 3130709ae487SNeilBrown rdev->data_offset << 9); 31312ff8cc2cSShaohua Li if (blk_queue_discard(bdev_get_queue(rdev->bdev))) 31322ff8cc2cSShaohua Li discard_supported = true; 3133709ae487SNeilBrown } 3134709ae487SNeilBrown 3135709ae487SNeilBrown mddev->degraded = 0; 3136709ae487SNeilBrown for (i = 0; i < conf->raid_disks; i++) 3137709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 3138709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 3139709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 3140709ae487SNeilBrown mddev->degraded++; 314107f1a685SYufen Yu /* 314207f1a685SYufen Yu * RAID1 needs at least one disk in active 314307f1a685SYufen Yu */ 314407f1a685SYufen Yu if (conf->raid_disks - mddev->degraded < 1) { 314507f1a685SYufen Yu ret = -EINVAL; 314607f1a685SYufen Yu goto abort; 314707f1a685SYufen Yu } 3148709ae487SNeilBrown 3149709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 3150709ae487SNeilBrown mddev->recovery_cp = MaxSector; 3151709ae487SNeilBrown 31528c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 31531d41c216SNeilBrown pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", 31548c6ac868SAndre Noll mdname(mddev)); 31551d41c216SNeilBrown pr_info("md/raid1:%s: active with %d out of %d mirrors\n", 31561da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 31571da177e4SLinus Torvalds mddev->raid_disks); 3158709ae487SNeilBrown 31591da177e4SLinus Torvalds /* 31601da177e4SLinus Torvalds * Ok, everything is just fine now 31611da177e4SLinus Torvalds */ 3162709ae487SNeilBrown mddev->thread = conf->thread; 3163709ae487SNeilBrown conf->thread = NULL; 3164709ae487SNeilBrown mddev->private = conf; 316546533ff7SNeilBrown set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); 3166709ae487SNeilBrown 31671f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 31681da177e4SLinus Torvalds 31691ed7242eSJonathan Brassow if (mddev->queue) { 31702ff8cc2cSShaohua Li if (discard_supported) 31718b904b5bSBart Van Assche blk_queue_flag_set(QUEUE_FLAG_DISCARD, 31722ff8cc2cSShaohua Li mddev->queue); 31732ff8cc2cSShaohua Li else 31748b904b5bSBart Van Assche blk_queue_flag_clear(QUEUE_FLAG_DISCARD, 31752ff8cc2cSShaohua Li mddev->queue); 31761ed7242eSJonathan Brassow } 31775220ea1eSmajianpeng 31785220ea1eSmajianpeng ret = md_integrity_register(mddev); 31795aa61f42SNeilBrown if (ret) { 31805aa61f42SNeilBrown md_unregister_thread(&mddev->thread); 318107f1a685SYufen Yu goto abort; 31825aa61f42SNeilBrown } 318307f1a685SYufen Yu return 0; 318407f1a685SYufen Yu 318507f1a685SYufen Yu abort: 318607f1a685SYufen Yu raid1_free(mddev, conf); 31875220ea1eSmajianpeng return ret; 31881da177e4SLinus Torvalds } 31891da177e4SLinus Torvalds 3190afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv) 31911da177e4SLinus Torvalds { 3192afa0f557SNeilBrown struct r1conf *conf = priv; 31934b6d287fSNeilBrown 3194afeee514SKent Overstreet mempool_exit(&conf->r1bio_pool); 31951da177e4SLinus Torvalds kfree(conf->mirrors); 31960fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage); 31971da177e4SLinus Torvalds kfree(conf->poolinfo); 3198fd76863eScolyli@suse.de kfree(conf->nr_pending); 3199fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3200fd76863eScolyli@suse.de kfree(conf->nr_queued); 3201fd76863eScolyli@suse.de kfree(conf->barrier); 3202afeee514SKent Overstreet bioset_exit(&conf->bio_split); 32031da177e4SLinus Torvalds kfree(conf); 32041da177e4SLinus Torvalds } 32051da177e4SLinus Torvalds 3206fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 32071da177e4SLinus Torvalds { 32081da177e4SLinus Torvalds /* no resync is happening, and there is enough space 32091da177e4SLinus Torvalds * on all devices, so we can resize. 32101da177e4SLinus Torvalds * We need to make sure resync covers any new space. 32111da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 32121da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 32131da177e4SLinus Torvalds * worth it. 32141da177e4SLinus Torvalds */ 3215a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 3216a4a6125aSNeilBrown if (mddev->external_size && 3217a4a6125aSNeilBrown mddev->array_sectors > newsize) 3218b522adcdSDan Williams return -EINVAL; 3219a4a6125aSNeilBrown if (mddev->bitmap) { 3220e64e4018SAndy Shevchenko int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); 3221a4a6125aSNeilBrown if (ret) 3222a4a6125aSNeilBrown return ret; 3223a4a6125aSNeilBrown } 3224a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 3225b522adcdSDan Williams if (sectors > mddev->dev_sectors && 3226b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 322758c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 32281da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 32291da177e4SLinus Torvalds } 3230b522adcdSDan Williams mddev->dev_sectors = sectors; 32314b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 32321da177e4SLinus Torvalds return 0; 32331da177e4SLinus Torvalds } 32341da177e4SLinus Torvalds 3235fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 32361da177e4SLinus Torvalds { 32371da177e4SLinus Torvalds /* We need to: 32381da177e4SLinus Torvalds * 1/ resize the r1bio_pool 32391da177e4SLinus Torvalds * 2/ resize conf->mirrors 32401da177e4SLinus Torvalds * 32411da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 32421da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 32431da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 32446ea9c07cSNeilBrown * 32456ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 32466ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 32471da177e4SLinus Torvalds */ 3248afeee514SKent Overstreet mempool_t newpool, oldpool; 32491da177e4SLinus Torvalds struct pool_info *newpoolinfo; 32500eaf822cSJonathan Brassow struct raid1_info *newmirrors; 3251e8096360SNeilBrown struct r1conf *conf = mddev->private; 325263c70c4fSNeilBrown int cnt, raid_disks; 3253c04be0aaSNeilBrown unsigned long flags; 32542214c260SArtur Paszkiewicz int d, d2; 3255afeee514SKent Overstreet int ret; 3256afeee514SKent Overstreet 3257afeee514SKent Overstreet memset(&newpool, 0, sizeof(newpool)); 3258afeee514SKent Overstreet memset(&oldpool, 0, sizeof(oldpool)); 32591da177e4SLinus Torvalds 326063c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 3261664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 326263c70c4fSNeilBrown mddev->layout != mddev->new_layout || 326363c70c4fSNeilBrown mddev->level != mddev->new_level) { 3264664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 326563c70c4fSNeilBrown mddev->new_layout = mddev->layout; 326663c70c4fSNeilBrown mddev->new_level = mddev->level; 326763c70c4fSNeilBrown return -EINVAL; 326863c70c4fSNeilBrown } 326963c70c4fSNeilBrown 32702214c260SArtur Paszkiewicz if (!mddev_is_clustered(mddev)) 32712214c260SArtur Paszkiewicz md_allow_write(mddev); 32722a2275d6SNeilBrown 327363c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 327463c70c4fSNeilBrown 32756ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 32766ea9c07cSNeilBrown cnt=0; 32776ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 32781da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 32796ea9c07cSNeilBrown cnt++; 32806ea9c07cSNeilBrown if (cnt > raid_disks) 32811da177e4SLinus Torvalds return -EBUSY; 32826ea9c07cSNeilBrown } 32831da177e4SLinus Torvalds 32841da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 32851da177e4SLinus Torvalds if (!newpoolinfo) 32861da177e4SLinus Torvalds return -ENOMEM; 32871da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 32888f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 32891da177e4SLinus Torvalds 32903f677f9cSMarcos Paulo de Souza ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc, 3291c7afa803SMarcos Paulo de Souza rbio_pool_free, newpoolinfo); 3292afeee514SKent Overstreet if (ret) { 32931da177e4SLinus Torvalds kfree(newpoolinfo); 3294afeee514SKent Overstreet return ret; 32951da177e4SLinus Torvalds } 32966396bb22SKees Cook newmirrors = kzalloc(array3_size(sizeof(struct raid1_info), 32976396bb22SKees Cook raid_disks, 2), 32988f19ccb2SNeilBrown GFP_KERNEL); 32991da177e4SLinus Torvalds if (!newmirrors) { 33001da177e4SLinus Torvalds kfree(newpoolinfo); 3301afeee514SKent Overstreet mempool_exit(&newpool); 33021da177e4SLinus Torvalds return -ENOMEM; 33031da177e4SLinus Torvalds } 33041da177e4SLinus Torvalds 3305e2d59925SNeilBrown freeze_array(conf, 0); 33061da177e4SLinus Torvalds 33071da177e4SLinus Torvalds /* ok, everything is stopped */ 33081da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 33091da177e4SLinus Torvalds conf->r1bio_pool = newpool; 33106ea9c07cSNeilBrown 3311a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 33123cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 3313a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 331436fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 3315a88aa786SNeilBrown rdev->raid_disk = d2; 331636fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 331736fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 33181d41c216SNeilBrown pr_warn("md/raid1:%s: cannot register rd%d\n", 331936fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 3320a88aa786SNeilBrown } 3321a88aa786SNeilBrown if (rdev) 3322a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 33236ea9c07cSNeilBrown } 33241da177e4SLinus Torvalds kfree(conf->mirrors); 33251da177e4SLinus Torvalds conf->mirrors = newmirrors; 33261da177e4SLinus Torvalds kfree(conf->poolinfo); 33271da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 33281da177e4SLinus Torvalds 3329c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 33301da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 3331c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 33321da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 333363c70c4fSNeilBrown mddev->delta_disks = 0; 33341da177e4SLinus Torvalds 3335e2d59925SNeilBrown unfreeze_array(conf); 33361da177e4SLinus Torvalds 3337985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 33381da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 33391da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 33401da177e4SLinus Torvalds 3341afeee514SKent Overstreet mempool_exit(&oldpool); 33421da177e4SLinus Torvalds return 0; 33431da177e4SLinus Torvalds } 33441da177e4SLinus Torvalds 3345b03e0ccbSNeilBrown static void raid1_quiesce(struct mddev *mddev, int quiesce) 334636fa3063SNeilBrown { 3347e8096360SNeilBrown struct r1conf *conf = mddev->private; 334836fa3063SNeilBrown 3349b03e0ccbSNeilBrown if (quiesce) 335007169fd4Smajianpeng freeze_array(conf, 0); 3351b03e0ccbSNeilBrown else 335207169fd4Smajianpeng unfreeze_array(conf); 335336fa3063SNeilBrown } 335436fa3063SNeilBrown 3355fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 3356709ae487SNeilBrown { 3357709ae487SNeilBrown /* raid1 can take over: 3358709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 3359709ae487SNeilBrown */ 3360709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 3361e8096360SNeilBrown struct r1conf *conf; 3362709ae487SNeilBrown mddev->new_level = 1; 3363709ae487SNeilBrown mddev->new_layout = 0; 3364709ae487SNeilBrown mddev->new_chunk_sectors = 0; 3365709ae487SNeilBrown conf = setup_conf(mddev); 33666995f0b2SShaohua Li if (!IS_ERR(conf)) { 336707169fd4Smajianpeng /* Array must appear to be quiesced */ 336807169fd4Smajianpeng conf->array_frozen = 1; 3369394ed8e4SShaohua Li mddev_clear_unsupported_flags(mddev, 3370394ed8e4SShaohua Li UNSUPPORTED_MDDEV_FLAGS); 33716995f0b2SShaohua Li } 3372709ae487SNeilBrown return conf; 3373709ae487SNeilBrown } 3374709ae487SNeilBrown return ERR_PTR(-EINVAL); 3375709ae487SNeilBrown } 33761da177e4SLinus Torvalds 337784fc4b56SNeilBrown static struct md_personality raid1_personality = 33781da177e4SLinus Torvalds { 33791da177e4SLinus Torvalds .name = "raid1", 33802604b703SNeilBrown .level = 1, 33811da177e4SLinus Torvalds .owner = THIS_MODULE, 3382849674e4SShaohua Li .make_request = raid1_make_request, 3383849674e4SShaohua Li .run = raid1_run, 3384afa0f557SNeilBrown .free = raid1_free, 3385849674e4SShaohua Li .status = raid1_status, 3386849674e4SShaohua Li .error_handler = raid1_error, 33871da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 33881da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 33891da177e4SLinus Torvalds .spare_active = raid1_spare_active, 3390849674e4SShaohua Li .sync_request = raid1_sync_request, 33911da177e4SLinus Torvalds .resize = raid1_resize, 339280c3a6ceSDan Williams .size = raid1_size, 339363c70c4fSNeilBrown .check_reshape = raid1_reshape, 339436fa3063SNeilBrown .quiesce = raid1_quiesce, 3395709ae487SNeilBrown .takeover = raid1_takeover, 33961da177e4SLinus Torvalds }; 33971da177e4SLinus Torvalds 33981da177e4SLinus Torvalds static int __init raid_init(void) 33991da177e4SLinus Torvalds { 34002604b703SNeilBrown return register_md_personality(&raid1_personality); 34011da177e4SLinus Torvalds } 34021da177e4SLinus Torvalds 34031da177e4SLinus Torvalds static void raid_exit(void) 34041da177e4SLinus Torvalds { 34052604b703SNeilBrown unregister_md_personality(&raid1_personality); 34061da177e4SLinus Torvalds } 34071da177e4SLinus Torvalds 34081da177e4SLinus Torvalds module_init(raid_init); 34091da177e4SLinus Torvalds module_exit(raid_exit); 34101da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 34110efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 34121da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3413d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 34142604b703SNeilBrown MODULE_ALIAS("md-level-1"); 341534db0cd6SNeilBrown 341634db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 3417