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 3034246a0b6SChristoph Hellwig bio_endio(bio); 304d2eb35acSNeilBrown } 305d2eb35acSNeilBrown 3069f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 3071da177e4SLinus Torvalds { 3081da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 309c91114c2SDavid Jeffery struct r1conf *conf = r1_bio->mddev->private; 3101da177e4SLinus Torvalds 3114b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 3124b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 31336a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 3144b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 3154f024f37SKent Overstreet (unsigned long long) bio->bi_iter.bi_sector, 3164f024f37SKent Overstreet (unsigned long long) bio_end_sector(bio) - 1); 3174b6d287fSNeilBrown 318d2eb35acSNeilBrown call_bio_endio(r1_bio); 3194b6d287fSNeilBrown } 320c91114c2SDavid Jeffery /* 321c91114c2SDavid Jeffery * Wake up any possible resync thread that waits for the device 322c91114c2SDavid Jeffery * to go idle. All I/Os, even write-behind writes, are done. 323c91114c2SDavid Jeffery */ 324c91114c2SDavid Jeffery allow_barrier(conf, r1_bio->sector); 325c91114c2SDavid Jeffery 3261da177e4SLinus Torvalds free_r1bio(r1_bio); 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds /* 3301da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 3311da177e4SLinus Torvalds */ 3329f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 3331da177e4SLinus Torvalds { 334e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 3351da177e4SLinus Torvalds 3361da177e4SLinus Torvalds conf->mirrors[disk].head_position = 3371da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 340ba3ae3beSNamhyung Kim /* 341ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 342ba3ae3beSNamhyung Kim */ 3439f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 344ba3ae3beSNamhyung Kim { 345ba3ae3beSNamhyung Kim int mirror; 34630194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 34730194636SNeilBrown int raid_disks = conf->raid_disks; 348ba3ae3beSNamhyung Kim 3498f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 350ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 351ba3ae3beSNamhyung Kim break; 352ba3ae3beSNamhyung Kim 3538f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 354ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 355ba3ae3beSNamhyung Kim 356ba3ae3beSNamhyung Kim return mirror; 357ba3ae3beSNamhyung Kim } 358ba3ae3beSNamhyung Kim 3594246a0b6SChristoph Hellwig static void raid1_end_read_request(struct bio *bio) 3601da177e4SLinus Torvalds { 3614e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status; 3629f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 363e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 364e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds /* 3671da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3681da177e4SLinus Torvalds */ 369e5872d58SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 370ddaf22abSNeilBrown 371220946c9SNeilBrown if (uptodate) 3721da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3732e52d449SNeilBrown else if (test_bit(FailFast, &rdev->flags) && 3742e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 3752e52d449SNeilBrown /* This was a fail-fast read so we definitely 3762e52d449SNeilBrown * want to retry */ 3772e52d449SNeilBrown ; 378dd00a99eSNeilBrown else { 379dd00a99eSNeilBrown /* If all other devices have failed, we want to return 380dd00a99eSNeilBrown * the error upwards rather than fail the last device. 381dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 382dd00a99eSNeilBrown */ 383dd00a99eSNeilBrown unsigned long flags; 384dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 385dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 386dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 387e5872d58SNeilBrown test_bit(In_sync, &rdev->flags))) 388dd00a99eSNeilBrown uptodate = 1; 389dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 390dd00a99eSNeilBrown } 3911da177e4SLinus Torvalds 3927ad4d4a6SNeilBrown if (uptodate) { 3931da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 394e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 3957ad4d4a6SNeilBrown } else { 3961da177e4SLinus Torvalds /* 3971da177e4SLinus Torvalds * oops, read error: 3981da177e4SLinus Torvalds */ 3991da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 4001d41c216SNeilBrown pr_err_ratelimited("md/raid1:%s: %s: rescheduling sector %llu\n", 4019dd1e2faSNeilBrown mdname(conf->mddev), 4021d41c216SNeilBrown bdevname(rdev->bdev, b), 4038bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 404d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 4051da177e4SLinus Torvalds reschedule_retry(r1_bio); 4067ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */ 4071da177e4SLinus Torvalds } 4081da177e4SLinus Torvalds } 4091da177e4SLinus Torvalds 4109f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 4114e78064fSNeilBrown { 4124e78064fSNeilBrown /* it really is the end of this request */ 4134e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 414841c1316SMing Lei bio_free_pages(r1_bio->behind_master_bio); 415841c1316SMing Lei bio_put(r1_bio->behind_master_bio); 416841c1316SMing Lei r1_bio->behind_master_bio = NULL; 4174e78064fSNeilBrown } 4184e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 419e64e4018SAndy Shevchenko md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 4204e78064fSNeilBrown r1_bio->sectors, 4214e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 422af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 4234e78064fSNeilBrown md_write_end(r1_bio->mddev); 424cd5ff9a1SNeilBrown } 425cd5ff9a1SNeilBrown 4269f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 427cd5ff9a1SNeilBrown { 428cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 429cd5ff9a1SNeilBrown return; 430cd5ff9a1SNeilBrown 431cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 432cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 433cd5ff9a1SNeilBrown else { 434cd5ff9a1SNeilBrown close_write(r1_bio); 4354367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 4364367af55SNeilBrown reschedule_retry(r1_bio); 4374367af55SNeilBrown else 4384e78064fSNeilBrown raid_end_bio_io(r1_bio); 4394e78064fSNeilBrown } 4404e78064fSNeilBrown } 4414e78064fSNeilBrown 4424246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio) 4431da177e4SLinus Torvalds { 4449f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 445e5872d58SNeilBrown int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 446e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 44704b857f7SNeilBrown struct bio *to_put = NULL; 448e5872d58SNeilBrown int mirror = find_bio_disk(r1_bio, bio); 449e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[mirror].rdev; 450e3f948cdSShaohua Li bool discard_error; 45169df9cfcSGuoqing Jiang sector_t lo = r1_bio->sector; 45269df9cfcSGuoqing Jiang sector_t hi = r1_bio->sector + r1_bio->sectors; 453e3f948cdSShaohua Li 4544e4cbee9SChristoph Hellwig discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds /* 457e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4581da177e4SLinus Torvalds */ 4594e4cbee9SChristoph Hellwig if (bio->bi_status && !discard_error) { 460e5872d58SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 461e5872d58SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 46219d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 46319d67169SNeilBrown conf->mddev->recovery); 46419d67169SNeilBrown 465212e7eb7SNeilBrown if (test_bit(FailFast, &rdev->flags) && 466212e7eb7SNeilBrown (bio->bi_opf & MD_FAILFAST) && 467212e7eb7SNeilBrown /* We never try FailFast to WriteMostly devices */ 468212e7eb7SNeilBrown !test_bit(WriteMostly, &rdev->flags)) { 469212e7eb7SNeilBrown md_error(r1_bio->mddev, rdev); 470eeba6809SYufen Yu } 471eeba6809SYufen Yu 472eeba6809SYufen Yu /* 473eeba6809SYufen Yu * When the device is faulty, it is not necessary to 474eeba6809SYufen Yu * handle write error. 475eeba6809SYufen Yu * For failfast, this is the only remaining device, 476eeba6809SYufen Yu * We need to retry the write without FailFast. 477212e7eb7SNeilBrown */ 478eeba6809SYufen Yu if (!test_bit(Faulty, &rdev->flags)) 479212e7eb7SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 480212e7eb7SNeilBrown else { 481212e7eb7SNeilBrown /* Finished with this branch */ 482212e7eb7SNeilBrown r1_bio->bios[mirror] = NULL; 483212e7eb7SNeilBrown to_put = bio; 484212e7eb7SNeilBrown } 4854367af55SNeilBrown } else { 4861da177e4SLinus Torvalds /* 487e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 488e9c7469bSTejun Heo * will return a good error code for to the higher 489e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 490e9c7469bSTejun Heo * fails. 4911da177e4SLinus Torvalds * 492e9c7469bSTejun Heo * The 'master' represents the composite IO operation 493e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 494e9c7469bSTejun Heo * will wait for the 'master' bio. 4951da177e4SLinus Torvalds */ 4964367af55SNeilBrown sector_t first_bad; 4974367af55SNeilBrown int bad_sectors; 4984367af55SNeilBrown 499cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 500cd5ff9a1SNeilBrown to_put = bio; 5013056e3aeSAlex Lyakas /* 5023056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is 5033056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use 5043056e3aeSAlex Lyakas * such device for properly reading the data back (we could 5053056e3aeSAlex Lyakas * potentially use it, if the current write would have felt 5063056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't 5073056e3aeSAlex Lyakas * check this here. 5083056e3aeSAlex Lyakas */ 509e5872d58SNeilBrown if (test_bit(In_sync, &rdev->flags) && 510e5872d58SNeilBrown !test_bit(Faulty, &rdev->flags)) 5111da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 5121da177e4SLinus Torvalds 5134367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 514e5872d58SNeilBrown if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 515e3f948cdSShaohua Li &first_bad, &bad_sectors) && !discard_error) { 5164367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 5174367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 5184367af55SNeilBrown } 5194367af55SNeilBrown } 5204367af55SNeilBrown 5214b6d287fSNeilBrown if (behind) { 52269df9cfcSGuoqing Jiang if (test_bit(CollisionCheck, &rdev->flags)) 523404659cfSGuoqing Jiang remove_serial(rdev, lo, hi); 524e5872d58SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) 5254b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 5264b6d287fSNeilBrown 527e9c7469bSTejun Heo /* 528e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 529e9c7469bSTejun Heo * has safely reached all non-writemostly 530e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 531e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 532e9c7469bSTejun Heo * -EIO here, instead we'll wait 533e9c7469bSTejun Heo */ 5344b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 5354b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 5364b6d287fSNeilBrown /* Maybe we can return now */ 5374b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 5384b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 53936a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 54036a4e1feSNeilBrown " %llu-%llu\n", 5414f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector, 5424f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1); 543d2eb35acSNeilBrown call_bio_endio(r1_bio); 5444b6d287fSNeilBrown } 5454b6d287fSNeilBrown } 54669df9cfcSGuoqing Jiang } else if (rdev->mddev->serialize_policy) 54769df9cfcSGuoqing Jiang remove_serial(rdev, lo, hi); 5484367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 549e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 550e9c7469bSTejun Heo 5511da177e4SLinus Torvalds /* 5521da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 5531da177e4SLinus Torvalds * already. 5541da177e4SLinus Torvalds */ 555af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 556c70810b3SNeilBrown 55704b857f7SNeilBrown if (to_put) 55804b857f7SNeilBrown bio_put(to_put); 5591da177e4SLinus Torvalds } 5601da177e4SLinus Torvalds 561fd76863eScolyli@suse.de static sector_t align_to_barrier_unit_end(sector_t start_sector, 562fd76863eScolyli@suse.de sector_t sectors) 563fd76863eScolyli@suse.de { 564fd76863eScolyli@suse.de sector_t len; 565fd76863eScolyli@suse.de 566fd76863eScolyli@suse.de WARN_ON(sectors == 0); 567fd76863eScolyli@suse.de /* 568fd76863eScolyli@suse.de * len is the number of sectors from start_sector to end of the 569fd76863eScolyli@suse.de * barrier unit which start_sector belongs to. 570fd76863eScolyli@suse.de */ 571fd76863eScolyli@suse.de len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - 572fd76863eScolyli@suse.de start_sector; 573fd76863eScolyli@suse.de 574fd76863eScolyli@suse.de if (len > sectors) 575fd76863eScolyli@suse.de len = sectors; 576fd76863eScolyli@suse.de 577fd76863eScolyli@suse.de return len; 578fd76863eScolyli@suse.de } 579fd76863eScolyli@suse.de 5801da177e4SLinus Torvalds /* 5811da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 5821da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 5831da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 5841da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 5851da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 5861da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 5871da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 5881da177e4SLinus Torvalds * 5891da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 5901da177e4SLinus Torvalds * because position is mirror, not device based. 5911da177e4SLinus Torvalds * 5921da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 5931da177e4SLinus Torvalds */ 594e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 5951da177e4SLinus Torvalds { 596af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 597d2eb35acSNeilBrown int sectors; 598d2eb35acSNeilBrown int best_good_sectors; 5999dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 6009dedf603SShaohua Li int has_nonrot_disk; 601be4d3280SShaohua Li int disk; 60276073054SNeilBrown sector_t best_dist; 6039dedf603SShaohua Li unsigned int min_pending; 6043cb03002SNeilBrown struct md_rdev *rdev; 605f3ac8bf7SNeilBrown int choose_first; 60612cee5a8SShaohua Li int choose_next_idle; 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds rcu_read_lock(); 6091da177e4SLinus Torvalds /* 6108ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 6111da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 6121da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 6131da177e4SLinus Torvalds */ 6141da177e4SLinus Torvalds retry: 615d2eb35acSNeilBrown sectors = r1_bio->sectors; 61676073054SNeilBrown best_disk = -1; 6179dedf603SShaohua Li best_dist_disk = -1; 61876073054SNeilBrown best_dist = MaxSector; 6199dedf603SShaohua Li best_pending_disk = -1; 6209dedf603SShaohua Li min_pending = UINT_MAX; 621d2eb35acSNeilBrown best_good_sectors = 0; 6229dedf603SShaohua Li has_nonrot_disk = 0; 62312cee5a8SShaohua Li choose_next_idle = 0; 6242e52d449SNeilBrown clear_bit(R1BIO_FailFast, &r1_bio->state); 625d2eb35acSNeilBrown 6267d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) || 6277d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) && 62890382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, 6297d49ffcfSGoldwyn Rodrigues this_sector + sectors))) 6307d49ffcfSGoldwyn Rodrigues choose_first = 1; 6317d49ffcfSGoldwyn Rodrigues else 6327d49ffcfSGoldwyn Rodrigues choose_first = 0; 6331da177e4SLinus Torvalds 634be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 63576073054SNeilBrown sector_t dist; 636d2eb35acSNeilBrown sector_t first_bad; 637d2eb35acSNeilBrown int bad_sectors; 6389dedf603SShaohua Li unsigned int pending; 63912cee5a8SShaohua Li bool nonrot; 640d2eb35acSNeilBrown 641f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 642f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 643f3ac8bf7SNeilBrown || rdev == NULL 64476073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 645f3ac8bf7SNeilBrown continue; 64676073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 64776073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 64876073054SNeilBrown continue; 64976073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 65076073054SNeilBrown /* Don't balance among write-mostly, just 65176073054SNeilBrown * use the first as a last resort */ 652d1901ef0STomáš Hodek if (best_dist_disk < 0) { 653307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 654307729c8SNeilBrown &first_bad, &bad_sectors)) { 655816b0acfSWei Fang if (first_bad <= this_sector) 656307729c8SNeilBrown /* Cannot use this */ 657307729c8SNeilBrown continue; 658307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 659307729c8SNeilBrown } else 660307729c8SNeilBrown best_good_sectors = sectors; 661d1901ef0STomáš Hodek best_dist_disk = disk; 662d1901ef0STomáš Hodek best_pending_disk = disk; 663307729c8SNeilBrown } 66476073054SNeilBrown continue; 6658ddf9efeSNeilBrown } 66676073054SNeilBrown /* This is a reasonable device to use. It might 66776073054SNeilBrown * even be best. 6681da177e4SLinus Torvalds */ 669d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 670d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 671d2eb35acSNeilBrown if (best_dist < MaxSector) 672d2eb35acSNeilBrown /* already have a better device */ 673d2eb35acSNeilBrown continue; 674d2eb35acSNeilBrown if (first_bad <= this_sector) { 675d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 676d2eb35acSNeilBrown * device, then we must not read beyond 677d2eb35acSNeilBrown * bad_sectors from another device.. 678d2eb35acSNeilBrown */ 679d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 680d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 681d2eb35acSNeilBrown sectors = bad_sectors; 682d2eb35acSNeilBrown if (best_good_sectors > sectors) 683d2eb35acSNeilBrown best_good_sectors = sectors; 684d2eb35acSNeilBrown 685d2eb35acSNeilBrown } else { 686d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 687d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 688d2eb35acSNeilBrown best_good_sectors = good_sectors; 689d2eb35acSNeilBrown best_disk = disk; 690d2eb35acSNeilBrown } 691d2eb35acSNeilBrown if (choose_first) 692d2eb35acSNeilBrown break; 693d2eb35acSNeilBrown } 694d2eb35acSNeilBrown continue; 695d82dd0e3STomasz Majchrzak } else { 696d82dd0e3STomasz Majchrzak if ((sectors > best_good_sectors) && (best_disk >= 0)) 697d82dd0e3STomasz Majchrzak best_disk = -1; 698d2eb35acSNeilBrown best_good_sectors = sectors; 699d82dd0e3STomasz Majchrzak } 700d2eb35acSNeilBrown 7012e52d449SNeilBrown if (best_disk >= 0) 7022e52d449SNeilBrown /* At least two disks to choose from so failfast is OK */ 7032e52d449SNeilBrown set_bit(R1BIO_FailFast, &r1_bio->state); 7042e52d449SNeilBrown 70512cee5a8SShaohua Li nonrot = blk_queue_nonrot(bdev_get_queue(rdev->bdev)); 70612cee5a8SShaohua Li has_nonrot_disk |= nonrot; 7079dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 70876073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 70912cee5a8SShaohua Li if (choose_first) { 71076073054SNeilBrown best_disk = disk; 7111da177e4SLinus Torvalds break; 7121da177e4SLinus Torvalds } 71312cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 71412cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 71512cee5a8SShaohua Li || dist == 0) { 71612cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 71712cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 71812cee5a8SShaohua Li 71912cee5a8SShaohua Li best_disk = disk; 72012cee5a8SShaohua Li /* 72112cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 72212cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 72312cee5a8SShaohua Li * the idle disk. read_balance could already choose an 72412cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 72512cee5a8SShaohua Li * this disk. This doesn't matter because this disk 72612cee5a8SShaohua Li * will idle, next time it will be utilized after the 72712cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 72812cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 72912cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 73012cee5a8SShaohua Li * small, but not a big deal since when the second disk 73112cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 73212cee5a8SShaohua Li */ 73312cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 73412cee5a8SShaohua Li mirror->seq_start != MaxSector && 73512cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 73612cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 73712cee5a8SShaohua Li mirror->seq_start) { 73812cee5a8SShaohua Li choose_next_idle = 1; 73912cee5a8SShaohua Li continue; 74012cee5a8SShaohua Li } 74112cee5a8SShaohua Li break; 74212cee5a8SShaohua Li } 74312cee5a8SShaohua Li 74412cee5a8SShaohua Li if (choose_next_idle) 74512cee5a8SShaohua Li continue; 7469dedf603SShaohua Li 7479dedf603SShaohua Li if (min_pending > pending) { 7489dedf603SShaohua Li min_pending = pending; 7499dedf603SShaohua Li best_pending_disk = disk; 7509dedf603SShaohua Li } 7519dedf603SShaohua Li 75276073054SNeilBrown if (dist < best_dist) { 75376073054SNeilBrown best_dist = dist; 7549dedf603SShaohua Li best_dist_disk = disk; 7551da177e4SLinus Torvalds } 756f3ac8bf7SNeilBrown } 7571da177e4SLinus Torvalds 7589dedf603SShaohua Li /* 7599dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 7609dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 7619dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 7629dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 7639dedf603SShaohua Li */ 7649dedf603SShaohua Li if (best_disk == -1) { 7652e52d449SNeilBrown if (has_nonrot_disk || min_pending == 0) 7669dedf603SShaohua Li best_disk = best_pending_disk; 7679dedf603SShaohua Li else 7689dedf603SShaohua Li best_disk = best_dist_disk; 7699dedf603SShaohua Li } 7709dedf603SShaohua Li 77176073054SNeilBrown if (best_disk >= 0) { 77276073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 7738ddf9efeSNeilBrown if (!rdev) 7748ddf9efeSNeilBrown goto retry; 7758ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 776d2eb35acSNeilBrown sectors = best_good_sectors; 77712cee5a8SShaohua Li 77812cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 77912cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 78012cee5a8SShaohua Li 781be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds rcu_read_unlock(); 784d2eb35acSNeilBrown *max_sectors = sectors; 7851da177e4SLinus Torvalds 78676073054SNeilBrown return best_disk; 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds 7895c675f83SNeilBrown static int raid1_congested(struct mddev *mddev, int bits) 7900d129228SNeilBrown { 791e8096360SNeilBrown struct r1conf *conf = mddev->private; 7920d129228SNeilBrown int i, ret = 0; 7930d129228SNeilBrown 7944452226eSTejun Heo if ((bits & (1 << WB_async_congested)) && 79534db0cd6SNeilBrown conf->pending_count >= max_queued_requests) 79634db0cd6SNeilBrown return 1; 79734db0cd6SNeilBrown 7980d129228SNeilBrown rcu_read_lock(); 799f53e29fcSNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 8003cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 8010d129228SNeilBrown if (rdev && !test_bit(Faulty, &rdev->flags)) { 802165125e1SJens Axboe struct request_queue *q = bdev_get_queue(rdev->bdev); 8030d129228SNeilBrown 8041ed7242eSJonathan Brassow BUG_ON(!q); 8051ed7242eSJonathan Brassow 8060d129228SNeilBrown /* Note the '|| 1' - when read_balance prefers 8070d129228SNeilBrown * non-congested targets, it can be removed 8080d129228SNeilBrown */ 8094452226eSTejun Heo if ((bits & (1 << WB_async_congested)) || 1) 810dc3b17ccSJan Kara ret |= bdi_congested(q->backing_dev_info, bits); 8110d129228SNeilBrown else 812dc3b17ccSJan Kara ret &= bdi_congested(q->backing_dev_info, bits); 8130d129228SNeilBrown } 8140d129228SNeilBrown } 8150d129228SNeilBrown rcu_read_unlock(); 8160d129228SNeilBrown return ret; 8170d129228SNeilBrown } 8180d129228SNeilBrown 819673ca68dSNeilBrown static void flush_bio_list(struct r1conf *conf, struct bio *bio) 820a35e63efSNeilBrown { 821673ca68dSNeilBrown /* flush any pending bitmap writes to disk before proceeding w/ I/O */ 822e64e4018SAndy Shevchenko md_bitmap_unplug(conf->mddev->bitmap); 82334db0cd6SNeilBrown wake_up(&conf->wait_barrier); 824a35e63efSNeilBrown 825a35e63efSNeilBrown while (bio) { /* submit pending writes */ 826a35e63efSNeilBrown struct bio *next = bio->bi_next; 82774d46992SChristoph Hellwig struct md_rdev *rdev = (void *)bio->bi_disk; 828a35e63efSNeilBrown bio->bi_next = NULL; 82974d46992SChristoph Hellwig bio_set_dev(bio, rdev->bdev); 8305e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 8316308d8e3SGuoqing Jiang bio_io_error(bio); 8325e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 83374d46992SChristoph Hellwig !blk_queue_discard(bio->bi_disk->queue))) 8342ff8cc2cSShaohua Li /* Just ignore it */ 8354246a0b6SChristoph Hellwig bio_endio(bio); 8362ff8cc2cSShaohua Li else 837a35e63efSNeilBrown generic_make_request(bio); 838a35e63efSNeilBrown bio = next; 8395fa4f8baSHannes Reinecke cond_resched(); 840a35e63efSNeilBrown } 841673ca68dSNeilBrown } 842673ca68dSNeilBrown 843673ca68dSNeilBrown static void flush_pending_writes(struct r1conf *conf) 844673ca68dSNeilBrown { 845673ca68dSNeilBrown /* Any writes that have been queued but are awaiting 846673ca68dSNeilBrown * bitmap updates get flushed here. 847673ca68dSNeilBrown */ 848673ca68dSNeilBrown spin_lock_irq(&conf->device_lock); 849673ca68dSNeilBrown 850673ca68dSNeilBrown if (conf->pending_bio_list.head) { 85118022a1bSShaohua Li struct blk_plug plug; 852673ca68dSNeilBrown struct bio *bio; 85318022a1bSShaohua Li 854673ca68dSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 855673ca68dSNeilBrown conf->pending_count = 0; 856673ca68dSNeilBrown spin_unlock_irq(&conf->device_lock); 857474beb57SNeilBrown 858474beb57SNeilBrown /* 859474beb57SNeilBrown * As this is called in a wait_event() loop (see freeze_array), 860474beb57SNeilBrown * current->state might be TASK_UNINTERRUPTIBLE which will 861474beb57SNeilBrown * cause a warning when we prepare to wait again. As it is 862474beb57SNeilBrown * rare that this path is taken, it is perfectly safe to force 863474beb57SNeilBrown * us to go around the wait_event() loop again, so the warning 864474beb57SNeilBrown * is a false-positive. Silence the warning by resetting 865474beb57SNeilBrown * thread state 866474beb57SNeilBrown */ 867474beb57SNeilBrown __set_current_state(TASK_RUNNING); 86818022a1bSShaohua Li blk_start_plug(&plug); 869673ca68dSNeilBrown flush_bio_list(conf, bio); 87018022a1bSShaohua Li blk_finish_plug(&plug); 871a35e63efSNeilBrown } else 872a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 8737eaceaccSJens Axboe } 8747eaceaccSJens Axboe 87517999be4SNeilBrown /* Barriers.... 87617999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 87717999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 87817999be4SNeilBrown * To do this we raise a 'barrier'. 87917999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 88017999be4SNeilBrown * to count how many activities are happening which preclude 88117999be4SNeilBrown * normal IO. 88217999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 88317999be4SNeilBrown * i.e. if nr_pending == 0. 88417999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 88517999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 88617999be4SNeilBrown * is ready, no other operations which require a barrier will start 88717999be4SNeilBrown * until the IO request has had a chance. 88817999be4SNeilBrown * 88917999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 89017999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 89117999be4SNeilBrown * allow_barrier when it has finished its IO. 89217999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 89317999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 89417999be4SNeilBrown * lower_barrier when the particular background IO completes. 8954675719dSHou Tao * 8964675719dSHou Tao * If resync/recovery is interrupted, returns -EINTR; 8974675719dSHou Tao * Otherwise, returns 0. 8981da177e4SLinus Torvalds */ 8994675719dSHou Tao static int raise_barrier(struct r1conf *conf, sector_t sector_nr) 9001da177e4SLinus Torvalds { 901fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 902fd76863eScolyli@suse.de 9031da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 9041da177e4SLinus Torvalds 90517999be4SNeilBrown /* Wait until no block IO is waiting */ 906824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 907824e47daScolyli@suse.de !atomic_read(&conf->nr_waiting[idx]), 908eed8c02eSLukas Czerner conf->resync_lock); 90917999be4SNeilBrown 91017999be4SNeilBrown /* block any new IO from starting */ 911824e47daScolyli@suse.de atomic_inc(&conf->barrier[idx]); 912824e47daScolyli@suse.de /* 913824e47daScolyli@suse.de * In raise_barrier() we firstly increase conf->barrier[idx] then 914824e47daScolyli@suse.de * check conf->nr_pending[idx]. In _wait_barrier() we firstly 915824e47daScolyli@suse.de * increase conf->nr_pending[idx] then check conf->barrier[idx]. 916824e47daScolyli@suse.de * A memory barrier here to make sure conf->nr_pending[idx] won't 917824e47daScolyli@suse.de * be fetched before conf->barrier[idx] is increased. Otherwise 918824e47daScolyli@suse.de * there will be a race between raise_barrier() and _wait_barrier(). 919824e47daScolyli@suse.de */ 920824e47daScolyli@suse.de smp_mb__after_atomic(); 92117999be4SNeilBrown 92279ef3a8aSmajianpeng /* For these conditions we must wait: 92379ef3a8aSmajianpeng * A: while the array is in frozen state 924fd76863eScolyli@suse.de * B: while conf->nr_pending[idx] is not 0, meaning regular I/O 925fd76863eScolyli@suse.de * existing in corresponding I/O barrier bucket. 926fd76863eScolyli@suse.de * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches 927fd76863eScolyli@suse.de * max resync count which allowed on current I/O barrier bucket. 92879ef3a8aSmajianpeng */ 92917999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 9308c242593SYufen Yu (!conf->array_frozen && 931824e47daScolyli@suse.de !atomic_read(&conf->nr_pending[idx]) && 9328c242593SYufen Yu atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH) || 9338c242593SYufen Yu test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery), 934eed8c02eSLukas Czerner conf->resync_lock); 93517999be4SNeilBrown 9368c242593SYufen Yu if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { 9378c242593SYufen Yu atomic_dec(&conf->barrier[idx]); 9388c242593SYufen Yu spin_unlock_irq(&conf->resync_lock); 9398c242593SYufen Yu wake_up(&conf->wait_barrier); 9408c242593SYufen Yu return -EINTR; 9418c242593SYufen Yu } 9428c242593SYufen Yu 94343ac9b84SXiao Ni atomic_inc(&conf->nr_sync_pending); 9441da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 9458c242593SYufen Yu 9468c242593SYufen Yu return 0; 9471da177e4SLinus Torvalds } 9481da177e4SLinus Torvalds 949fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr) 95017999be4SNeilBrown { 951fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 952fd76863eScolyli@suse.de 953824e47daScolyli@suse.de BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); 954fd76863eScolyli@suse.de 955824e47daScolyli@suse.de atomic_dec(&conf->barrier[idx]); 95643ac9b84SXiao Ni atomic_dec(&conf->nr_sync_pending); 95717999be4SNeilBrown wake_up(&conf->wait_barrier); 95817999be4SNeilBrown } 95917999be4SNeilBrown 960fd76863eScolyli@suse.de static void _wait_barrier(struct r1conf *conf, int idx) 96117999be4SNeilBrown { 962824e47daScolyli@suse.de /* 963824e47daScolyli@suse.de * We need to increase conf->nr_pending[idx] very early here, 964824e47daScolyli@suse.de * then raise_barrier() can be blocked when it waits for 965824e47daScolyli@suse.de * conf->nr_pending[idx] to be 0. Then we can avoid holding 966824e47daScolyli@suse.de * conf->resync_lock when there is no barrier raised in same 967824e47daScolyli@suse.de * barrier unit bucket. Also if the array is frozen, I/O 968824e47daScolyli@suse.de * should be blocked until array is unfrozen. 969824e47daScolyli@suse.de */ 970824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 971824e47daScolyli@suse.de /* 972824e47daScolyli@suse.de * In _wait_barrier() we firstly increase conf->nr_pending[idx], then 973824e47daScolyli@suse.de * check conf->barrier[idx]. In raise_barrier() we firstly increase 974824e47daScolyli@suse.de * conf->barrier[idx], then check conf->nr_pending[idx]. A memory 975824e47daScolyli@suse.de * barrier is necessary here to make sure conf->barrier[idx] won't be 976824e47daScolyli@suse.de * fetched before conf->nr_pending[idx] is increased. Otherwise there 977824e47daScolyli@suse.de * will be a race between _wait_barrier() and raise_barrier(). 978824e47daScolyli@suse.de */ 979824e47daScolyli@suse.de smp_mb__after_atomic(); 98079ef3a8aSmajianpeng 981824e47daScolyli@suse.de /* 982824e47daScolyli@suse.de * Don't worry about checking two atomic_t variables at same time 983824e47daScolyli@suse.de * here. If during we check conf->barrier[idx], the array is 984824e47daScolyli@suse.de * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is 985824e47daScolyli@suse.de * 0, it is safe to return and make the I/O continue. Because the 986824e47daScolyli@suse.de * array is frozen, all I/O returned here will eventually complete 987824e47daScolyli@suse.de * or be queued, no race will happen. See code comment in 988824e47daScolyli@suse.de * frozen_array(). 989824e47daScolyli@suse.de */ 990824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen) && 991824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx])) 992824e47daScolyli@suse.de return; 993824e47daScolyli@suse.de 994824e47daScolyli@suse.de /* 995824e47daScolyli@suse.de * After holding conf->resync_lock, conf->nr_pending[idx] 996824e47daScolyli@suse.de * should be decreased before waiting for barrier to drop. 997824e47daScolyli@suse.de * Otherwise, we may encounter a race condition because 998824e47daScolyli@suse.de * raise_barrer() might be waiting for conf->nr_pending[idx] 999824e47daScolyli@suse.de * to be 0 at same time. 1000824e47daScolyli@suse.de */ 1001824e47daScolyli@suse.de spin_lock_irq(&conf->resync_lock); 1002824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 1003824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 1004824e47daScolyli@suse.de /* 1005824e47daScolyli@suse.de * In case freeze_array() is waiting for 1006824e47daScolyli@suse.de * get_unqueued_pending() == extra 1007824e47daScolyli@suse.de */ 1008824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 1009824e47daScolyli@suse.de /* Wait for the barrier in same barrier unit bucket to drop. */ 1010824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 1011824e47daScolyli@suse.de !conf->array_frozen && 1012824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx]), 1013824e47daScolyli@suse.de conf->resync_lock); 1014824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 1015824e47daScolyli@suse.de atomic_dec(&conf->nr_waiting[idx]); 1016fd76863eScolyli@suse.de spin_unlock_irq(&conf->resync_lock); 101779ef3a8aSmajianpeng } 101879ef3a8aSmajianpeng 1019fd76863eScolyli@suse.de static void wait_read_barrier(struct r1conf *conf, sector_t sector_nr) 102079ef3a8aSmajianpeng { 1021fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 102279ef3a8aSmajianpeng 1023824e47daScolyli@suse.de /* 1024824e47daScolyli@suse.de * Very similar to _wait_barrier(). The difference is, for read 1025824e47daScolyli@suse.de * I/O we don't need wait for sync I/O, but if the whole array 1026824e47daScolyli@suse.de * is frozen, the read I/O still has to wait until the array is 1027824e47daScolyli@suse.de * unfrozen. Since there is no ordering requirement with 1028824e47daScolyli@suse.de * conf->barrier[idx] here, memory barrier is unnecessary as well. 1029824e47daScolyli@suse.de */ 1030824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 1031824e47daScolyli@suse.de 1032824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen)) 1033824e47daScolyli@suse.de return; 103417999be4SNeilBrown 103517999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 1036824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 1037824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 1038824e47daScolyli@suse.de /* 1039824e47daScolyli@suse.de * In case freeze_array() is waiting for 1040824e47daScolyli@suse.de * get_unqueued_pending() == extra 1041d6b42dcbSNeilBrown */ 104217999be4SNeilBrown wake_up(&conf->wait_barrier); 1043824e47daScolyli@suse.de /* Wait for array to be unfrozen */ 1044824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 1045fd76863eScolyli@suse.de !conf->array_frozen, 10461da177e4SLinus Torvalds conf->resync_lock); 1047824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 1048824e47daScolyli@suse.de atomic_dec(&conf->nr_waiting[idx]); 104917999be4SNeilBrown spin_unlock_irq(&conf->resync_lock); 105017999be4SNeilBrown } 105117999be4SNeilBrown 1052fd76863eScolyli@suse.de static void wait_barrier(struct r1conf *conf, sector_t sector_nr) 1053fd76863eScolyli@suse.de { 1054fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1055fd76863eScolyli@suse.de 1056fd76863eScolyli@suse.de _wait_barrier(conf, idx); 1057fd76863eScolyli@suse.de } 1058fd76863eScolyli@suse.de 1059fd76863eScolyli@suse.de static void _allow_barrier(struct r1conf *conf, int idx) 106017999be4SNeilBrown { 1061824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 106217999be4SNeilBrown wake_up(&conf->wait_barrier); 106317999be4SNeilBrown } 106417999be4SNeilBrown 1065fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr) 1066fd76863eScolyli@suse.de { 1067fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1068fd76863eScolyli@suse.de 1069fd76863eScolyli@suse.de _allow_barrier(conf, idx); 1070fd76863eScolyli@suse.de } 1071fd76863eScolyli@suse.de 1072fd76863eScolyli@suse.de /* conf->resync_lock should be held */ 1073fd76863eScolyli@suse.de static int get_unqueued_pending(struct r1conf *conf) 1074fd76863eScolyli@suse.de { 1075fd76863eScolyli@suse.de int idx, ret; 1076fd76863eScolyli@suse.de 107743ac9b84SXiao Ni ret = atomic_read(&conf->nr_sync_pending); 107843ac9b84SXiao Ni for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1079824e47daScolyli@suse.de ret += atomic_read(&conf->nr_pending[idx]) - 1080824e47daScolyli@suse.de atomic_read(&conf->nr_queued[idx]); 1081fd76863eScolyli@suse.de 1082fd76863eScolyli@suse.de return ret; 108317999be4SNeilBrown } 108417999be4SNeilBrown 1085e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra) 1086ddaf22abSNeilBrown { 1087fd76863eScolyli@suse.de /* Stop sync I/O and normal I/O and wait for everything to 108811353b9dSZhilong Liu * go quiet. 1089fd76863eScolyli@suse.de * This is called in two situations: 1090fd76863eScolyli@suse.de * 1) management command handlers (reshape, remove disk, quiesce). 1091fd76863eScolyli@suse.de * 2) one normal I/O request failed. 1092fd76863eScolyli@suse.de 1093fd76863eScolyli@suse.de * After array_frozen is set to 1, new sync IO will be blocked at 1094fd76863eScolyli@suse.de * raise_barrier(), and new normal I/O will blocked at _wait_barrier() 1095fd76863eScolyli@suse.de * or wait_read_barrier(). The flying I/Os will either complete or be 1096fd76863eScolyli@suse.de * queued. When everything goes quite, there are only queued I/Os left. 1097fd76863eScolyli@suse.de 1098fd76863eScolyli@suse.de * Every flying I/O contributes to a conf->nr_pending[idx], idx is the 1099fd76863eScolyli@suse.de * barrier bucket index which this I/O request hits. When all sync and 1100fd76863eScolyli@suse.de * normal I/O are queued, sum of all conf->nr_pending[] will match sum 1101fd76863eScolyli@suse.de * of all conf->nr_queued[]. But normal I/O failure is an exception, 1102fd76863eScolyli@suse.de * in handle_read_error(), we may call freeze_array() before trying to 1103fd76863eScolyli@suse.de * fix the read error. In this case, the error read I/O is not queued, 1104fd76863eScolyli@suse.de * so get_unqueued_pending() == 1. 1105fd76863eScolyli@suse.de * 1106fd76863eScolyli@suse.de * Therefore before this function returns, we need to wait until 1107fd76863eScolyli@suse.de * get_unqueued_pendings(conf) gets equal to extra. For 1108fd76863eScolyli@suse.de * normal I/O context, extra is 1, in rested situations extra is 0. 1109ddaf22abSNeilBrown */ 1110ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1111b364e3d0Smajianpeng conf->array_frozen = 1; 1112578b54adSNeilBrown raid1_log(conf->mddev, "wait freeze"); 1113fd76863eScolyli@suse.de wait_event_lock_irq_cmd( 1114fd76863eScolyli@suse.de conf->wait_barrier, 1115fd76863eScolyli@suse.de get_unqueued_pending(conf) == extra, 1116ddaf22abSNeilBrown conf->resync_lock, 1117c3b328acSNeilBrown flush_pending_writes(conf)); 1118ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1119ddaf22abSNeilBrown } 1120e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 1121ddaf22abSNeilBrown { 1122ddaf22abSNeilBrown /* reverse the effect of the freeze */ 1123ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1124b364e3d0Smajianpeng conf->array_frozen = 0; 1125ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1126824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 1127ddaf22abSNeilBrown } 1128ddaf22abSNeilBrown 112916d56e2fSShaohua Li static void alloc_behind_master_bio(struct r1bio *r1_bio, 1130cb83efcfSNeilBrown struct bio *bio) 11314b6d287fSNeilBrown { 1132cb83efcfSNeilBrown int size = bio->bi_iter.bi_size; 1133841c1316SMing Lei unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 1134841c1316SMing Lei int i = 0; 1135841c1316SMing Lei struct bio *behind_bio = NULL; 11364b6d287fSNeilBrown 1137841c1316SMing Lei behind_bio = bio_alloc_mddev(GFP_NOIO, vcnt, r1_bio->mddev); 1138841c1316SMing Lei if (!behind_bio) 113916d56e2fSShaohua Li return; 1140841c1316SMing Lei 114141743c1fSShaohua Li /* discard op, we don't support writezero/writesame yet */ 114216d56e2fSShaohua Li if (!bio_has_data(bio)) { 114316d56e2fSShaohua Li behind_bio->bi_iter.bi_size = size; 114441743c1fSShaohua Li goto skip_copy; 114516d56e2fSShaohua Li } 114641743c1fSShaohua Li 1147dba40d46SMariusz Dabrowski behind_bio->bi_write_hint = bio->bi_write_hint; 1148dba40d46SMariusz Dabrowski 1149841c1316SMing Lei while (i < vcnt && size) { 1150841c1316SMing Lei struct page *page; 1151841c1316SMing Lei int len = min_t(int, PAGE_SIZE, size); 1152841c1316SMing Lei 1153841c1316SMing Lei page = alloc_page(GFP_NOIO); 1154841c1316SMing Lei if (unlikely(!page)) 1155841c1316SMing Lei goto free_pages; 1156841c1316SMing Lei 1157841c1316SMing Lei bio_add_page(behind_bio, page, len, 0); 1158841c1316SMing Lei 1159841c1316SMing Lei size -= len; 1160841c1316SMing Lei i++; 11614b6d287fSNeilBrown } 11624b6d287fSNeilBrown 1163cb83efcfSNeilBrown bio_copy_data(behind_bio, bio); 116441743c1fSShaohua Li skip_copy: 116556a64c17SLuis de Bethencourt r1_bio->behind_master_bio = behind_bio; 1166841c1316SMing Lei set_bit(R1BIO_BehindIO, &r1_bio->state); 1167841c1316SMing Lei 116816d56e2fSShaohua Li return; 1169841c1316SMing Lei 1170841c1316SMing Lei free_pages: 11714f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n", 11724f024f37SKent Overstreet bio->bi_iter.bi_size); 1173841c1316SMing Lei bio_free_pages(behind_bio); 117416d56e2fSShaohua Li bio_put(behind_bio); 11754b6d287fSNeilBrown } 11764b6d287fSNeilBrown 1177f54a9d0eSNeilBrown struct raid1_plug_cb { 1178f54a9d0eSNeilBrown struct blk_plug_cb cb; 1179f54a9d0eSNeilBrown struct bio_list pending; 1180f54a9d0eSNeilBrown int pending_cnt; 1181f54a9d0eSNeilBrown }; 1182f54a9d0eSNeilBrown 1183f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) 1184f54a9d0eSNeilBrown { 1185f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, 1186f54a9d0eSNeilBrown cb); 1187f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data; 1188f54a9d0eSNeilBrown struct r1conf *conf = mddev->private; 1189f54a9d0eSNeilBrown struct bio *bio; 1190f54a9d0eSNeilBrown 1191874807a8SNeilBrown if (from_schedule || current->bio_list) { 1192f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock); 1193f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending); 1194f54a9d0eSNeilBrown conf->pending_count += plug->pending_cnt; 1195f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock); 1196ee0b0244SNeilBrown wake_up(&conf->wait_barrier); 1197f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread); 1198f54a9d0eSNeilBrown kfree(plug); 1199f54a9d0eSNeilBrown return; 1200f54a9d0eSNeilBrown } 1201f54a9d0eSNeilBrown 1202f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */ 1203f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending); 1204673ca68dSNeilBrown flush_bio_list(conf, bio); 1205f54a9d0eSNeilBrown kfree(plug); 1206f54a9d0eSNeilBrown } 1207f54a9d0eSNeilBrown 1208689389a0SNeilBrown static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) 1209689389a0SNeilBrown { 1210689389a0SNeilBrown r1_bio->master_bio = bio; 1211689389a0SNeilBrown r1_bio->sectors = bio_sectors(bio); 1212689389a0SNeilBrown r1_bio->state = 0; 1213689389a0SNeilBrown r1_bio->mddev = mddev; 1214689389a0SNeilBrown r1_bio->sector = bio->bi_iter.bi_sector; 1215689389a0SNeilBrown } 1216689389a0SNeilBrown 1217fd76863eScolyli@suse.de static inline struct r1bio * 1218689389a0SNeilBrown alloc_r1bio(struct mddev *mddev, struct bio *bio) 1219fd76863eScolyli@suse.de { 1220fd76863eScolyli@suse.de struct r1conf *conf = mddev->private; 1221fd76863eScolyli@suse.de struct r1bio *r1_bio; 1222fd76863eScolyli@suse.de 1223afeee514SKent Overstreet r1_bio = mempool_alloc(&conf->r1bio_pool, GFP_NOIO); 1224689389a0SNeilBrown /* Ensure no bio records IO_BLOCKED */ 1225689389a0SNeilBrown memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); 1226689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio); 1227fd76863eScolyli@suse.de return r1_bio; 1228fd76863eScolyli@suse.de } 1229fd76863eScolyli@suse.de 1230c230e7e5SNeilBrown static void raid1_read_request(struct mddev *mddev, struct bio *bio, 1231689389a0SNeilBrown int max_read_sectors, struct r1bio *r1_bio) 12321da177e4SLinus Torvalds { 1233e8096360SNeilBrown struct r1conf *conf = mddev->private; 12340eaf822cSJonathan Brassow struct raid1_info *mirror; 12351da177e4SLinus Torvalds struct bio *read_bio; 12363b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 1237796a5cf0SMike Christie const int op = bio_op(bio); 12381eff9d32SJens Axboe const unsigned long do_sync = (bio->bi_opf & REQ_SYNC); 12391f68f0c4SNeilBrown int max_sectors; 1240d2eb35acSNeilBrown int rdisk; 1241689389a0SNeilBrown bool print_msg = !!r1_bio; 1242689389a0SNeilBrown char b[BDEVNAME_SIZE]; 1243689389a0SNeilBrown 1244689389a0SNeilBrown /* 1245689389a0SNeilBrown * If r1_bio is set, we are blocking the raid1d thread 1246689389a0SNeilBrown * so there is a tiny risk of deadlock. So ask for 1247689389a0SNeilBrown * emergency memory if needed. 1248689389a0SNeilBrown */ 1249689389a0SNeilBrown gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; 1250689389a0SNeilBrown 1251689389a0SNeilBrown if (print_msg) { 1252689389a0SNeilBrown /* Need to get the block device name carefully */ 1253689389a0SNeilBrown struct md_rdev *rdev; 1254689389a0SNeilBrown rcu_read_lock(); 1255689389a0SNeilBrown rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); 1256689389a0SNeilBrown if (rdev) 1257689389a0SNeilBrown bdevname(rdev->bdev, b); 1258689389a0SNeilBrown else 1259689389a0SNeilBrown strcpy(b, "???"); 1260689389a0SNeilBrown rcu_read_unlock(); 1261689389a0SNeilBrown } 1262d2eb35acSNeilBrown 1263fd76863eScolyli@suse.de /* 1264fd76863eScolyli@suse.de * Still need barrier for READ in case that whole 1265fd76863eScolyli@suse.de * array is frozen. 1266fd76863eScolyli@suse.de */ 1267fd76863eScolyli@suse.de wait_read_barrier(conf, bio->bi_iter.bi_sector); 12683b046a97SRobert LeBlanc 1269689389a0SNeilBrown if (!r1_bio) 1270689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio); 1271689389a0SNeilBrown else 1272689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio); 1273c230e7e5SNeilBrown r1_bio->sectors = max_read_sectors; 1274fd76863eScolyli@suse.de 1275fd76863eScolyli@suse.de /* 1276fd76863eScolyli@suse.de * make_request() can abort the operation when read-ahead is being 1277fd76863eScolyli@suse.de * used and no empty request is available. 1278fd76863eScolyli@suse.de */ 1279d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 12801da177e4SLinus Torvalds 12811da177e4SLinus Torvalds if (rdisk < 0) { 12821da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 1283689389a0SNeilBrown if (print_msg) { 1284689389a0SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 1285689389a0SNeilBrown mdname(mddev), 1286689389a0SNeilBrown b, 1287689389a0SNeilBrown (unsigned long long)r1_bio->sector); 1288689389a0SNeilBrown } 12891da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 12905a7bbad2SChristoph Hellwig return; 12911da177e4SLinus Torvalds } 12921da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 12931da177e4SLinus Torvalds 1294689389a0SNeilBrown if (print_msg) 1295689389a0SNeilBrown pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %s\n", 1296689389a0SNeilBrown mdname(mddev), 1297689389a0SNeilBrown (unsigned long long)r1_bio->sector, 1298689389a0SNeilBrown bdevname(mirror->rdev->bdev, b)); 1299689389a0SNeilBrown 1300e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1301e555190dSNeilBrown bitmap) { 13023b046a97SRobert LeBlanc /* 13033b046a97SRobert LeBlanc * Reading from a write-mostly device must take care not to 13043b046a97SRobert LeBlanc * over-take any writes that are 'behind' 1305e555190dSNeilBrown */ 1306578b54adSNeilBrown raid1_log(mddev, "wait behind writes"); 1307e555190dSNeilBrown wait_event(bitmap->behind_wait, 1308e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 1309e555190dSNeilBrown } 1310c230e7e5SNeilBrown 1311c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1312c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1313afeee514SKent Overstreet gfp, &conf->bio_split); 1314c230e7e5SNeilBrown bio_chain(split, bio); 1315c230e7e5SNeilBrown generic_make_request(bio); 1316c230e7e5SNeilBrown bio = split; 1317c230e7e5SNeilBrown r1_bio->master_bio = bio; 1318c230e7e5SNeilBrown r1_bio->sectors = max_sectors; 1319c230e7e5SNeilBrown } 1320c230e7e5SNeilBrown 13211da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 13221da177e4SLinus Torvalds 1323afeee514SKent Overstreet read_bio = bio_clone_fast(bio, gfp, &mddev->bio_set); 13241da177e4SLinus Torvalds 13251da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 13261da177e4SLinus Torvalds 13274f024f37SKent Overstreet read_bio->bi_iter.bi_sector = r1_bio->sector + 13284f024f37SKent Overstreet mirror->rdev->data_offset; 132974d46992SChristoph Hellwig bio_set_dev(read_bio, mirror->rdev->bdev); 13301da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 1331796a5cf0SMike Christie bio_set_op_attrs(read_bio, op, do_sync); 13322e52d449SNeilBrown if (test_bit(FailFast, &mirror->rdev->flags) && 13332e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 13342e52d449SNeilBrown read_bio->bi_opf |= MD_FAILFAST; 13351da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 13361da177e4SLinus Torvalds 1337109e3765SNeilBrown if (mddev->gendisk) 133874d46992SChristoph Hellwig trace_block_bio_remap(read_bio->bi_disk->queue, read_bio, 133974d46992SChristoph Hellwig disk_devt(mddev->gendisk), r1_bio->sector); 1340109e3765SNeilBrown 13411da177e4SLinus Torvalds generic_make_request(read_bio); 13421da177e4SLinus Torvalds } 13431da177e4SLinus Torvalds 1344c230e7e5SNeilBrown static void raid1_write_request(struct mddev *mddev, struct bio *bio, 1345c230e7e5SNeilBrown int max_write_sectors) 13463b046a97SRobert LeBlanc { 13473b046a97SRobert LeBlanc struct r1conf *conf = mddev->private; 1348fd76863eScolyli@suse.de struct r1bio *r1_bio; 13493b046a97SRobert LeBlanc int i, disks; 13503b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 13513b046a97SRobert LeBlanc unsigned long flags; 13523b046a97SRobert LeBlanc struct md_rdev *blocked_rdev; 13533b046a97SRobert LeBlanc struct blk_plug_cb *cb; 13543b046a97SRobert LeBlanc struct raid1_plug_cb *plug = NULL; 13553b046a97SRobert LeBlanc int first_clone; 13563b046a97SRobert LeBlanc int max_sectors; 13573b046a97SRobert LeBlanc 1358b3143b9aSNeilBrown if (mddev_is_clustered(mddev) && 13593b046a97SRobert LeBlanc md_cluster_ops->area_resyncing(mddev, WRITE, 1360b3143b9aSNeilBrown bio->bi_iter.bi_sector, bio_end_sector(bio))) { 13613b046a97SRobert LeBlanc 13623b046a97SRobert LeBlanc DEFINE_WAIT(w); 13633b046a97SRobert LeBlanc for (;;) { 13643b046a97SRobert LeBlanc prepare_to_wait(&conf->wait_barrier, 1365ae89fd3dSMikulas Patocka &w, TASK_IDLE); 1366f81f7302SGuoqing Jiang if (!md_cluster_ops->area_resyncing(mddev, WRITE, 13673b046a97SRobert LeBlanc bio->bi_iter.bi_sector, 1368b3143b9aSNeilBrown bio_end_sector(bio))) 13693b046a97SRobert LeBlanc break; 13703b046a97SRobert LeBlanc schedule(); 13713b046a97SRobert LeBlanc } 13723b046a97SRobert LeBlanc finish_wait(&conf->wait_barrier, &w); 13733b046a97SRobert LeBlanc } 1374f81f7302SGuoqing Jiang 1375f81f7302SGuoqing Jiang /* 1376f81f7302SGuoqing Jiang * Register the new request and wait if the reconstruction 1377f81f7302SGuoqing Jiang * thread has put up a bar for new requests. 1378f81f7302SGuoqing Jiang * Continue immediately if no resync is active currently. 1379f81f7302SGuoqing Jiang */ 1380fd76863eScolyli@suse.de wait_barrier(conf, bio->bi_iter.bi_sector); 1381fd76863eScolyli@suse.de 1382689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio); 1383c230e7e5SNeilBrown r1_bio->sectors = max_write_sectors; 13843b046a97SRobert LeBlanc 138534db0cd6SNeilBrown if (conf->pending_count >= max_queued_requests) { 138634db0cd6SNeilBrown md_wakeup_thread(mddev->thread); 1387578b54adSNeilBrown raid1_log(mddev, "wait queued"); 138834db0cd6SNeilBrown wait_event(conf->wait_barrier, 138934db0cd6SNeilBrown conf->pending_count < max_queued_requests); 139034db0cd6SNeilBrown } 13911f68f0c4SNeilBrown /* first select target devices under rcu_lock and 13921da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 13931da177e4SLinus Torvalds * bios[x] to bio 13941f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 13951f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 13961f68f0c4SNeilBrown * blocks. 13971f68f0c4SNeilBrown * This potentially requires several writes to write around 13981f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 13991f68f0c4SNeilBrown * with a set of bios attached. 14001da177e4SLinus Torvalds */ 1401c3b328acSNeilBrown 14028f19ccb2SNeilBrown disks = conf->raid_disks * 2; 14036bfe0b49SDan Williams retry_write: 14046bfe0b49SDan Williams blocked_rdev = NULL; 14051da177e4SLinus Torvalds rcu_read_lock(); 14061f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 14071da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 14083cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 14096bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 14106bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 14116bfe0b49SDan Williams blocked_rdev = rdev; 14126bfe0b49SDan Williams break; 14136bfe0b49SDan Williams } 14141da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 14158ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) { 14168f19ccb2SNeilBrown if (i < conf->raid_disks) 14171f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 14181f68f0c4SNeilBrown continue; 1419964147d5SNeilBrown } 14201f68f0c4SNeilBrown 14211f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 14221f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 14231f68f0c4SNeilBrown sector_t first_bad; 14241f68f0c4SNeilBrown int bad_sectors; 14251f68f0c4SNeilBrown int is_bad; 14261f68f0c4SNeilBrown 14273b046a97SRobert LeBlanc is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, 14281f68f0c4SNeilBrown &first_bad, &bad_sectors); 14291f68f0c4SNeilBrown if (is_bad < 0) { 14301f68f0c4SNeilBrown /* mustn't write here until the bad block is 14311f68f0c4SNeilBrown * acknowledged*/ 14321f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 14331f68f0c4SNeilBrown blocked_rdev = rdev; 14341f68f0c4SNeilBrown break; 14351f68f0c4SNeilBrown } 14361f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 14371f68f0c4SNeilBrown /* Cannot write here at all */ 14381f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 14391f68f0c4SNeilBrown if (bad_sectors < max_sectors) 14401f68f0c4SNeilBrown /* mustn't write more than bad_sectors 14411f68f0c4SNeilBrown * to other devices yet 14421f68f0c4SNeilBrown */ 14431f68f0c4SNeilBrown max_sectors = bad_sectors; 14441f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 14451f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 14461f68f0c4SNeilBrown * only applies if the disk is 14471f68f0c4SNeilBrown * missing, so it might be re-added, 14481f68f0c4SNeilBrown * and we want to know to recover this 14491f68f0c4SNeilBrown * chunk. 14501f68f0c4SNeilBrown * In this case the device is here, 14511f68f0c4SNeilBrown * and the fact that this chunk is not 14521f68f0c4SNeilBrown * in-sync is recorded in the bad 14531f68f0c4SNeilBrown * block log 14541f68f0c4SNeilBrown */ 14551f68f0c4SNeilBrown continue; 14561f68f0c4SNeilBrown } 14571f68f0c4SNeilBrown if (is_bad) { 14581f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 14591f68f0c4SNeilBrown if (good_sectors < max_sectors) 14601f68f0c4SNeilBrown max_sectors = good_sectors; 14611f68f0c4SNeilBrown } 14621f68f0c4SNeilBrown } 14631f68f0c4SNeilBrown r1_bio->bios[i] = bio; 14641da177e4SLinus Torvalds } 14651da177e4SLinus Torvalds rcu_read_unlock(); 14661da177e4SLinus Torvalds 14676bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 14686bfe0b49SDan Williams /* Wait for this device to become unblocked */ 14696bfe0b49SDan Williams int j; 14706bfe0b49SDan Williams 14716bfe0b49SDan Williams for (j = 0; j < i; j++) 14726bfe0b49SDan Williams if (r1_bio->bios[j]) 14736bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 14741f68f0c4SNeilBrown r1_bio->state = 0; 1475fd76863eScolyli@suse.de allow_barrier(conf, bio->bi_iter.bi_sector); 1476578b54adSNeilBrown raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); 14776bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 1478fd76863eScolyli@suse.de wait_barrier(conf, bio->bi_iter.bi_sector); 14796bfe0b49SDan Williams goto retry_write; 14806bfe0b49SDan Williams } 14816bfe0b49SDan Williams 1482c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1483c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1484afeee514SKent Overstreet GFP_NOIO, &conf->bio_split); 1485c230e7e5SNeilBrown bio_chain(split, bio); 1486c230e7e5SNeilBrown generic_make_request(bio); 1487c230e7e5SNeilBrown bio = split; 1488c230e7e5SNeilBrown r1_bio->master_bio = bio; 14891f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 1490191ea9b2SNeilBrown } 14914b6d287fSNeilBrown 14924e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 14934b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1494191ea9b2SNeilBrown 14951f68f0c4SNeilBrown first_clone = 1; 1496d8c84c4fSMing Lei 14971da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 14988e58e327SMing Lei struct bio *mbio = NULL; 149969df9cfcSGuoqing Jiang struct md_rdev *rdev = conf->mirrors[i].rdev; 15001da177e4SLinus Torvalds if (!r1_bio->bios[i]) 15011da177e4SLinus Torvalds continue; 15021da177e4SLinus Torvalds 15031f68f0c4SNeilBrown if (first_clone) { 15041f68f0c4SNeilBrown /* do behind I/O ? 15051f68f0c4SNeilBrown * Not if there are too many, or cannot 15061f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 15071f68f0c4SNeilBrown * is waiting for behind writes to flush */ 15081f68f0c4SNeilBrown if (bitmap && 15091f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 15101f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 15118e58e327SMing Lei !waitqueue_active(&bitmap->behind_wait)) { 151216d56e2fSShaohua Li alloc_behind_master_bio(r1_bio, bio); 15138e58e327SMing Lei } 15141da177e4SLinus Torvalds 1515e64e4018SAndy Shevchenko md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors, 1516e64e4018SAndy Shevchenko test_bit(R1BIO_BehindIO, &r1_bio->state)); 15171f68f0c4SNeilBrown first_clone = 0; 15181f68f0c4SNeilBrown } 15198e58e327SMing Lei 1520841c1316SMing Lei if (r1_bio->behind_master_bio) 1521841c1316SMing Lei mbio = bio_clone_fast(r1_bio->behind_master_bio, 1522afeee514SKent Overstreet GFP_NOIO, &mddev->bio_set); 1523c230e7e5SNeilBrown else 1524afeee514SKent Overstreet mbio = bio_clone_fast(bio, GFP_NOIO, &mddev->bio_set); 15258e58e327SMing Lei 1526841c1316SMing Lei if (r1_bio->behind_master_bio) { 152769df9cfcSGuoqing Jiang if (test_bit(CollisionCheck, &rdev->flags)) 1528d0d2d8baSGuoqing Jiang wait_for_serialization(rdev, r1_bio); 15293e148a32SGuoqing Jiang if (test_bit(WriteMostly, &rdev->flags)) 15304b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 153169df9cfcSGuoqing Jiang } else if (mddev->serialize_policy) 1532d0d2d8baSGuoqing Jiang wait_for_serialization(rdev, r1_bio); 15334b6d287fSNeilBrown 15341f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 15351f68f0c4SNeilBrown 15364f024f37SKent Overstreet mbio->bi_iter.bi_sector = (r1_bio->sector + 15371f68f0c4SNeilBrown conf->mirrors[i].rdev->data_offset); 153874d46992SChristoph Hellwig bio_set_dev(mbio, conf->mirrors[i].rdev->bdev); 15391f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 1540a682e003SLinus Torvalds mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); 1541212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags) && 1542212e7eb7SNeilBrown !test_bit(WriteMostly, &conf->mirrors[i].rdev->flags) && 1543212e7eb7SNeilBrown conf->raid_disks - mddev->degraded > 1) 1544212e7eb7SNeilBrown mbio->bi_opf |= MD_FAILFAST; 15451f68f0c4SNeilBrown mbio->bi_private = r1_bio; 15461f68f0c4SNeilBrown 15471da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1548f54a9d0eSNeilBrown 1549109e3765SNeilBrown if (mddev->gendisk) 155074d46992SChristoph Hellwig trace_block_bio_remap(mbio->bi_disk->queue, 1551109e3765SNeilBrown mbio, disk_devt(mddev->gendisk), 1552109e3765SNeilBrown r1_bio->sector); 1553109e3765SNeilBrown /* flush_pending_writes() needs access to the rdev so...*/ 155474d46992SChristoph Hellwig mbio->bi_disk = (void *)conf->mirrors[i].rdev; 1555109e3765SNeilBrown 1556f54a9d0eSNeilBrown cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); 1557f54a9d0eSNeilBrown if (cb) 1558f54a9d0eSNeilBrown plug = container_of(cb, struct raid1_plug_cb, cb); 1559f54a9d0eSNeilBrown else 1560f54a9d0eSNeilBrown plug = NULL; 1561f54a9d0eSNeilBrown if (plug) { 1562f54a9d0eSNeilBrown bio_list_add(&plug->pending, mbio); 1563f54a9d0eSNeilBrown plug->pending_cnt++; 1564f54a9d0eSNeilBrown } else { 156523b245c0SShaohua Li spin_lock_irqsave(&conf->device_lock, flags); 15664e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 156734db0cd6SNeilBrown conf->pending_count++; 1568191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1569b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 15704e78064fSNeilBrown } 157123b245c0SShaohua Li } 15721f68f0c4SNeilBrown 1573079fa166SNeilBrown r1_bio_write_done(r1_bio); 1574079fa166SNeilBrown 1575079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1576079fa166SNeilBrown wake_up(&conf->wait_barrier); 15771da177e4SLinus Torvalds } 15781da177e4SLinus Torvalds 1579cc27b0c7SNeilBrown static bool raid1_make_request(struct mddev *mddev, struct bio *bio) 15803b046a97SRobert LeBlanc { 1581fd76863eScolyli@suse.de sector_t sectors; 15823b046a97SRobert LeBlanc 1583775d7831SDavid Jeffery if (unlikely(bio->bi_opf & REQ_PREFLUSH) 1584775d7831SDavid Jeffery && md_flush_request(mddev, bio)) 1585cc27b0c7SNeilBrown return true; 15863b046a97SRobert LeBlanc 1587c230e7e5SNeilBrown /* 1588c230e7e5SNeilBrown * There is a limit to the maximum size, but 1589c230e7e5SNeilBrown * the read/write handler might find a lower limit 1590c230e7e5SNeilBrown * due to bad blocks. To avoid multiple splits, 1591c230e7e5SNeilBrown * we pass the maximum number of sectors down 1592c230e7e5SNeilBrown * and let the lower level perform the split. 1593c230e7e5SNeilBrown */ 1594fd76863eScolyli@suse.de sectors = align_to_barrier_unit_end( 1595fd76863eScolyli@suse.de bio->bi_iter.bi_sector, bio_sectors(bio)); 15963b046a97SRobert LeBlanc 1597c230e7e5SNeilBrown if (bio_data_dir(bio) == READ) 1598689389a0SNeilBrown raid1_read_request(mddev, bio, sectors, NULL); 1599cc27b0c7SNeilBrown else { 1600cc27b0c7SNeilBrown if (!md_write_start(mddev,bio)) 1601cc27b0c7SNeilBrown return false; 1602c230e7e5SNeilBrown raid1_write_request(mddev, bio, sectors); 16033b046a97SRobert LeBlanc } 1604cc27b0c7SNeilBrown return true; 1605cc27b0c7SNeilBrown } 16063b046a97SRobert LeBlanc 1607849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev) 16081da177e4SLinus Torvalds { 1609e8096360SNeilBrown struct r1conf *conf = mddev->private; 16101da177e4SLinus Torvalds int i; 16111da177e4SLinus Torvalds 16121da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 161311ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1614ddac7c7eSNeilBrown rcu_read_lock(); 1615ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 16163cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 16171da177e4SLinus Torvalds seq_printf(seq, "%s", 1618ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1619ddac7c7eSNeilBrown } 1620ddac7c7eSNeilBrown rcu_read_unlock(); 16211da177e4SLinus Torvalds seq_printf(seq, "]"); 16221da177e4SLinus Torvalds } 16231da177e4SLinus Torvalds 1624849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) 16251da177e4SLinus Torvalds { 16261da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 1627e8096360SNeilBrown struct r1conf *conf = mddev->private; 1628423f04d6SNeilBrown unsigned long flags; 16291da177e4SLinus Torvalds 16301da177e4SLinus Torvalds /* 16311da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 16329a567843SGuoqing Jiang * else if it is the last working disks with "fail_last_dev == false", 16339a567843SGuoqing Jiang * ignore the error, let the next level up know. 16341da177e4SLinus Torvalds * else mark the drive as failed 16351da177e4SLinus Torvalds */ 16362e52d449SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 16379a567843SGuoqing Jiang if (test_bit(In_sync, &rdev->flags) && !mddev->fail_last_dev 16384044ba58SNeilBrown && (conf->raid_disks - mddev->degraded) == 1) { 16391da177e4SLinus Torvalds /* 16401da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 16414044ba58SNeilBrown * normal single drive. 16424044ba58SNeilBrown * However don't try a recovery from this drive as 16434044ba58SNeilBrown * it is very likely to fail. 16441da177e4SLinus Torvalds */ 16455389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 16462e52d449SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16471da177e4SLinus Torvalds return; 16484044ba58SNeilBrown } 1649de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1650ebda52faSYufen Yu if (test_and_clear_bit(In_sync, &rdev->flags)) 16511da177e4SLinus Torvalds mddev->degraded++; 1652dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 1653423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16541da177e4SLinus Torvalds /* 16551da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 16561da177e4SLinus Torvalds */ 1657dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 16582953079cSShaohua Li set_mask_bits(&mddev->sb_flags, 0, 16592953079cSShaohua Li BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); 16601d41c216SNeilBrown pr_crit("md/raid1:%s: Disk failure on %s, disabling device.\n" 1661067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 16629dd1e2faSNeilBrown mdname(mddev), bdevname(rdev->bdev, b), 16639dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 16641da177e4SLinus Torvalds } 16651da177e4SLinus Torvalds 1666e8096360SNeilBrown static void print_conf(struct r1conf *conf) 16671da177e4SLinus Torvalds { 16681da177e4SLinus Torvalds int i; 16691da177e4SLinus Torvalds 16701d41c216SNeilBrown pr_debug("RAID1 conf printout:\n"); 16711da177e4SLinus Torvalds if (!conf) { 16721d41c216SNeilBrown pr_debug("(!conf)\n"); 16731da177e4SLinus Torvalds return; 16741da177e4SLinus Torvalds } 16751d41c216SNeilBrown pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 16761da177e4SLinus Torvalds conf->raid_disks); 16771da177e4SLinus Torvalds 1678ddac7c7eSNeilBrown rcu_read_lock(); 16791da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 16801da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 16813cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1682ddac7c7eSNeilBrown if (rdev) 16831d41c216SNeilBrown pr_debug(" disk %d, wo:%d, o:%d, dev:%s\n", 1684ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1685ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1686ddac7c7eSNeilBrown bdevname(rdev->bdev,b)); 16871da177e4SLinus Torvalds } 1688ddac7c7eSNeilBrown rcu_read_unlock(); 16891da177e4SLinus Torvalds } 16901da177e4SLinus Torvalds 1691e8096360SNeilBrown static void close_sync(struct r1conf *conf) 16921da177e4SLinus Torvalds { 1693f6eca2d4SNate Dailey int idx; 1694f6eca2d4SNate Dailey 1695f6eca2d4SNate Dailey for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) { 1696f6eca2d4SNate Dailey _wait_barrier(conf, idx); 1697f6eca2d4SNate Dailey _allow_barrier(conf, idx); 1698f6eca2d4SNate Dailey } 16991da177e4SLinus Torvalds 1700afeee514SKent Overstreet mempool_exit(&conf->r1buf_pool); 17011da177e4SLinus Torvalds } 17021da177e4SLinus Torvalds 1703fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 17041da177e4SLinus Torvalds { 17051da177e4SLinus Torvalds int i; 1706e8096360SNeilBrown struct r1conf *conf = mddev->private; 17076b965620SNeilBrown int count = 0; 17086b965620SNeilBrown unsigned long flags; 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds /* 17111da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1712ddac7c7eSNeilBrown * and mark them readable. 1713ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 1714423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request 1715423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent. 17161da177e4SLinus Torvalds */ 1717423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 17181da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 17193cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 17208c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 17218c7a2c2bSNeilBrown if (repl 17221aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags) 17238c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 17248c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 17258c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 17268c7a2c2bSNeilBrown /* replacement has just become active */ 17278c7a2c2bSNeilBrown if (!rdev || 17288c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 17298c7a2c2bSNeilBrown count++; 17308c7a2c2bSNeilBrown if (rdev) { 17318c7a2c2bSNeilBrown /* Replaced device not technically 17328c7a2c2bSNeilBrown * faulty, but we need to be sure 17338c7a2c2bSNeilBrown * it gets removed and never re-added 17348c7a2c2bSNeilBrown */ 17358c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 17368c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 17378c7a2c2bSNeilBrown rdev->sysfs_state); 17388c7a2c2bSNeilBrown } 17398c7a2c2bSNeilBrown } 1740ddac7c7eSNeilBrown if (rdev 174161e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector 1742ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1743c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 17446b965620SNeilBrown count++; 1745654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 17461da177e4SLinus Torvalds } 17471da177e4SLinus Torvalds } 17486b965620SNeilBrown mddev->degraded -= count; 17496b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 17501da177e4SLinus Torvalds 17511da177e4SLinus Torvalds print_conf(conf); 17526b965620SNeilBrown return count; 17531da177e4SLinus Torvalds } 17541da177e4SLinus Torvalds 1755fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 17561da177e4SLinus Torvalds { 1757e8096360SNeilBrown struct r1conf *conf = mddev->private; 1758199050eaSNeil Brown int err = -EEXIST; 175941158c7eSNeilBrown int mirror = 0; 17600eaf822cSJonathan Brassow struct raid1_info *p; 17616c2fce2eSNeil Brown int first = 0; 176230194636SNeilBrown int last = conf->raid_disks - 1; 17631da177e4SLinus Torvalds 17645389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 17655389042fSNeilBrown return -EBUSY; 17665389042fSNeilBrown 17671501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev)) 17681501efadSDan Williams return -ENXIO; 17691501efadSDan Williams 17706c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 17716c2fce2eSNeil Brown first = last = rdev->raid_disk; 17726c2fce2eSNeil Brown 177370bcecdbSGoldwyn Rodrigues /* 177470bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk 177570bcecdbSGoldwyn Rodrigues * if possible. 177670bcecdbSGoldwyn Rodrigues */ 177770bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 && 177870bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first && 17799e753ba9SShaohua Li rdev->saved_raid_disk < conf->raid_disks && 178070bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL) 178170bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk; 178270bcecdbSGoldwyn Rodrigues 17837ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 17847ef449d1SNeilBrown p = conf->mirrors + mirror; 17857ef449d1SNeilBrown if (!p->rdev) { 17869092c02dSJonathan Brassow if (mddev->gendisk) 17878f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 17888f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 17891da177e4SLinus Torvalds 17901da177e4SLinus Torvalds p->head_position = 0; 17911da177e4SLinus Torvalds rdev->raid_disk = mirror; 1792199050eaSNeil Brown err = 0; 17936aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 17946aea114aSNeilBrown * if this was recently any drive of the array 17956aea114aSNeilBrown */ 17966aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 179741158c7eSNeilBrown conf->fullsync = 1; 1798d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 17991da177e4SLinus Torvalds break; 18001da177e4SLinus Torvalds } 18017ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 18027ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 18037ef449d1SNeilBrown /* Add this device as a replacement */ 18047ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 18057ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 18067ef449d1SNeilBrown rdev->raid_disk = mirror; 18077ef449d1SNeilBrown err = 0; 18087ef449d1SNeilBrown conf->fullsync = 1; 18097ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 18107ef449d1SNeilBrown break; 18117ef449d1SNeilBrown } 18127ef449d1SNeilBrown } 18139092c02dSJonathan Brassow if (mddev->queue && blk_queue_discard(bdev_get_queue(rdev->bdev))) 18148b904b5bSBart Van Assche blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue); 18151da177e4SLinus Torvalds print_conf(conf); 1816199050eaSNeil Brown return err; 18171da177e4SLinus Torvalds } 18181da177e4SLinus Torvalds 1819b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 18201da177e4SLinus Torvalds { 1821e8096360SNeilBrown struct r1conf *conf = mddev->private; 18221da177e4SLinus Torvalds int err = 0; 1823b8321b68SNeilBrown int number = rdev->raid_disk; 18240eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 18251da177e4SLinus Torvalds 1826b014f14cSNeilBrown if (rdev != p->rdev) 1827b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1828b014f14cSNeilBrown 18291da177e4SLinus Torvalds print_conf(conf); 1830b8321b68SNeilBrown if (rdev == p->rdev) { 1831b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 18321da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 18331da177e4SLinus Torvalds err = -EBUSY; 18341da177e4SLinus Torvalds goto abort; 18351da177e4SLinus Torvalds } 1836046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1837dfc70645SNeilBrown * is not possible. 1838dfc70645SNeilBrown */ 1839dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 18405389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1841dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1842dfc70645SNeilBrown err = -EBUSY; 1843dfc70645SNeilBrown goto abort; 1844dfc70645SNeilBrown } 18451da177e4SLinus Torvalds p->rdev = NULL; 1846d787be40SNeilBrown if (!test_bit(RemoveSynchronized, &rdev->flags)) { 1847fbd568a3SPaul E. McKenney synchronize_rcu(); 18481da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 18491da177e4SLinus Torvalds /* lost the race, try later */ 18501da177e4SLinus Torvalds err = -EBUSY; 18511da177e4SLinus Torvalds p->rdev = rdev; 1852ac5e7113SAndre Noll goto abort; 1853d787be40SNeilBrown } 1854d787be40SNeilBrown } 1855d787be40SNeilBrown if (conf->mirrors[conf->raid_disks + number].rdev) { 18568c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 18578c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 18588c7a2c2bSNeilBrown * doing this to avoid confusion. 18598c7a2c2bSNeilBrown */ 18608c7a2c2bSNeilBrown struct md_rdev *repl = 18618c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 1862e2d59925SNeilBrown freeze_array(conf, 0); 18633de59bb9SYufen Yu if (atomic_read(&repl->nr_pending)) { 18643de59bb9SYufen Yu /* It means that some queued IO of retry_list 18653de59bb9SYufen Yu * hold repl. Thus, we cannot set replacement 18663de59bb9SYufen Yu * as NULL, avoiding rdev NULL pointer 18673de59bb9SYufen Yu * dereference in sync_request_write and 18683de59bb9SYufen Yu * handle_write_finished. 18693de59bb9SYufen Yu */ 18703de59bb9SYufen Yu err = -EBUSY; 18713de59bb9SYufen Yu unfreeze_array(conf); 18723de59bb9SYufen Yu goto abort; 18733de59bb9SYufen Yu } 18748c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 18758c7a2c2bSNeilBrown p->rdev = repl; 18768c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 1877e2d59925SNeilBrown unfreeze_array(conf); 1878e5bc9c3cSGuoqing Jiang } 1879e5bc9c3cSGuoqing Jiang 18808c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1881a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 18821da177e4SLinus Torvalds } 18831da177e4SLinus Torvalds abort: 18841da177e4SLinus Torvalds 18851da177e4SLinus Torvalds print_conf(conf); 18861da177e4SLinus Torvalds return err; 18871da177e4SLinus Torvalds } 18881da177e4SLinus Torvalds 18894246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio) 18901da177e4SLinus Torvalds { 189198d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 18921da177e4SLinus Torvalds 18930fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1894ba3ae3beSNamhyung Kim 18951da177e4SLinus Torvalds /* 18961da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 18971da177e4SLinus Torvalds * or re-read if the read failed. 18981da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 18991da177e4SLinus Torvalds */ 19004e4cbee9SChristoph Hellwig if (!bio->bi_status) 19011da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1902d11c171eSNeilBrown 1903d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 19041da177e4SLinus Torvalds reschedule_retry(r1_bio); 19051da177e4SLinus Torvalds } 19061da177e4SLinus Torvalds 1907dfcc34c9SNate Dailey static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio) 1908dfcc34c9SNate Dailey { 1909dfcc34c9SNate Dailey sector_t sync_blocks = 0; 1910dfcc34c9SNate Dailey sector_t s = r1_bio->sector; 1911dfcc34c9SNate Dailey long sectors_to_go = r1_bio->sectors; 1912dfcc34c9SNate Dailey 1913dfcc34c9SNate Dailey /* make sure these bits don't get cleared. */ 1914dfcc34c9SNate Dailey do { 1915dfcc34c9SNate Dailey md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); 1916dfcc34c9SNate Dailey s += sync_blocks; 1917dfcc34c9SNate Dailey sectors_to_go -= sync_blocks; 1918dfcc34c9SNate Dailey } while (sectors_to_go > 0); 1919dfcc34c9SNate Dailey } 1920dfcc34c9SNate Dailey 1921449808a2SHou Tao static void put_sync_write_buf(struct r1bio *r1_bio, int uptodate) 1922449808a2SHou Tao { 1923449808a2SHou Tao if (atomic_dec_and_test(&r1_bio->remaining)) { 1924449808a2SHou Tao struct mddev *mddev = r1_bio->mddev; 1925449808a2SHou Tao int s = r1_bio->sectors; 1926449808a2SHou Tao 1927449808a2SHou Tao if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1928449808a2SHou Tao test_bit(R1BIO_WriteError, &r1_bio->state)) 1929449808a2SHou Tao reschedule_retry(r1_bio); 1930449808a2SHou Tao else { 1931449808a2SHou Tao put_buf(r1_bio); 1932449808a2SHou Tao md_done_sync(mddev, s, uptodate); 1933449808a2SHou Tao } 1934449808a2SHou Tao } 1935449808a2SHou Tao } 1936449808a2SHou Tao 19374246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio) 19381da177e4SLinus Torvalds { 19394e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status; 194098d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 1941fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1942e8096360SNeilBrown struct r1conf *conf = mddev->private; 19434367af55SNeilBrown sector_t first_bad; 19444367af55SNeilBrown int bad_sectors; 1945854abd75SNeilBrown struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; 1946ba3ae3beSNamhyung Kim 19476b1117d5SNeilBrown if (!uptodate) { 1948dfcc34c9SNate Dailey abort_sync_write(mddev, r1_bio); 1949854abd75SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1950854abd75SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 195119d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 195219d67169SNeilBrown mddev->recovery); 1953d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 1954854abd75SNeilBrown } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 19553a9f28a5SNeilBrown &first_bad, &bad_sectors) && 19563a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 19573a9f28a5SNeilBrown r1_bio->sector, 19583a9f28a5SNeilBrown r1_bio->sectors, 19593a9f28a5SNeilBrown &first_bad, &bad_sectors) 19603a9f28a5SNeilBrown ) 19614367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1962e3b9703eSNeilBrown 1963449808a2SHou Tao put_sync_write_buf(r1_bio, uptodate); 19644367af55SNeilBrown } 19651da177e4SLinus Torvalds 19663cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1967d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1968d8f05d29SNeilBrown { 1969796a5cf0SMike Christie if (sync_page_io(rdev, sector, sectors << 9, page, rw, 0, false)) 1970d8f05d29SNeilBrown /* success */ 1971d8f05d29SNeilBrown return 1; 197219d67169SNeilBrown if (rw == WRITE) { 1973d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 197419d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 197519d67169SNeilBrown &rdev->flags)) 197619d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 197719d67169SNeilBrown rdev->mddev->recovery); 197819d67169SNeilBrown } 1979d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1980d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1981d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1982d8f05d29SNeilBrown return 0; 1983d8f05d29SNeilBrown } 1984d8f05d29SNeilBrown 19859f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 19861da177e4SLinus Torvalds { 1987a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 198869382e85SNeilBrown * good data, much like with normal read errors. Only 1989ddac7c7eSNeilBrown * read into the pages we already have so we don't 199069382e85SNeilBrown * need to re-issue the read request. 199169382e85SNeilBrown * We don't need to freeze the array, because being in an 199269382e85SNeilBrown * active sync request, there is no normal IO, and 199369382e85SNeilBrown * no overlapping syncs. 199406f60385SNeilBrown * We don't need to check is_badblock() again as we 199506f60385SNeilBrown * made sure that anything with a bad block in range 199606f60385SNeilBrown * will have bi_end_io clear. 19971da177e4SLinus Torvalds */ 1998fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1999e8096360SNeilBrown struct r1conf *conf = mddev->private; 2000a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 200144cf0f4dSMing Lei struct page **pages = get_resync_pages(bio)->pages; 200269382e85SNeilBrown sector_t sect = r1_bio->sector; 200369382e85SNeilBrown int sectors = r1_bio->sectors; 200469382e85SNeilBrown int idx = 0; 20052e52d449SNeilBrown struct md_rdev *rdev; 20062e52d449SNeilBrown 20072e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 20082e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) { 20092e52d449SNeilBrown /* Don't try recovering from here - just fail it 20102e52d449SNeilBrown * ... unless it is the last working device of course */ 20112e52d449SNeilBrown md_error(mddev, rdev); 20122e52d449SNeilBrown if (test_bit(Faulty, &rdev->flags)) 20132e52d449SNeilBrown /* Don't try to read from here, but make sure 20142e52d449SNeilBrown * put_buf does it's thing 20152e52d449SNeilBrown */ 20162e52d449SNeilBrown bio->bi_end_io = end_sync_write; 20172e52d449SNeilBrown } 201869382e85SNeilBrown 201969382e85SNeilBrown while(sectors) { 202069382e85SNeilBrown int s = sectors; 202169382e85SNeilBrown int d = r1_bio->read_disk; 202269382e85SNeilBrown int success = 0; 202378d7f5f7SNeilBrown int start; 202469382e85SNeilBrown 202569382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 202669382e85SNeilBrown s = PAGE_SIZE >> 9; 202769382e85SNeilBrown do { 202869382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 2029ddac7c7eSNeilBrown /* No rcu protection needed here devices 2030ddac7c7eSNeilBrown * can only be removed when no resync is 2031ddac7c7eSNeilBrown * active, and resync is currently active 2032ddac7c7eSNeilBrown */ 203369382e85SNeilBrown rdev = conf->mirrors[d].rdev; 20349d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 203544cf0f4dSMing Lei pages[idx], 2036796a5cf0SMike Christie REQ_OP_READ, 0, false)) { 203769382e85SNeilBrown success = 1; 203869382e85SNeilBrown break; 203969382e85SNeilBrown } 204069382e85SNeilBrown } 204169382e85SNeilBrown d++; 20428f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 204369382e85SNeilBrown d = 0; 204469382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 204569382e85SNeilBrown 204678d7f5f7SNeilBrown if (!success) { 204778d7f5f7SNeilBrown char b[BDEVNAME_SIZE]; 20483a9f28a5SNeilBrown int abort = 0; 20493a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 20503a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 20513a9f28a5SNeilBrown * work just disable and interrupt the recovery. 20523a9f28a5SNeilBrown * Don't fail devices as that won't really help. 20533a9f28a5SNeilBrown */ 20541d41c216SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 205574d46992SChristoph Hellwig mdname(mddev), bio_devname(bio, b), 205678d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 20578f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 20583a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 20593a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 20603a9f28a5SNeilBrown continue; 20613a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 20623a9f28a5SNeilBrown abort = 1; 20633a9f28a5SNeilBrown } 20643a9f28a5SNeilBrown if (abort) { 2065d890fa2bSNeilBrown conf->recovery_disabled = 2066d890fa2bSNeilBrown mddev->recovery_disabled; 20673a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 206878d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 206978d7f5f7SNeilBrown put_buf(r1_bio); 207078d7f5f7SNeilBrown return 0; 207178d7f5f7SNeilBrown } 20723a9f28a5SNeilBrown /* Try next page */ 20733a9f28a5SNeilBrown sectors -= s; 20743a9f28a5SNeilBrown sect += s; 20753a9f28a5SNeilBrown idx++; 20763a9f28a5SNeilBrown continue; 20773a9f28a5SNeilBrown } 207878d7f5f7SNeilBrown 207978d7f5f7SNeilBrown start = d; 208069382e85SNeilBrown /* write it back and re-read */ 208169382e85SNeilBrown while (d != r1_bio->read_disk) { 208269382e85SNeilBrown if (d == 0) 20838f19ccb2SNeilBrown d = conf->raid_disks * 2; 208469382e85SNeilBrown d--; 208569382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 208669382e85SNeilBrown continue; 208769382e85SNeilBrown rdev = conf->mirrors[d].rdev; 2088d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 208944cf0f4dSMing Lei pages[idx], 2090d8f05d29SNeilBrown WRITE) == 0) { 209178d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 209278d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 20939d3d8011SNamhyung Kim } 2094097426f6SNeilBrown } 2095097426f6SNeilBrown d = start; 2096097426f6SNeilBrown while (d != r1_bio->read_disk) { 2097097426f6SNeilBrown if (d == 0) 20988f19ccb2SNeilBrown d = conf->raid_disks * 2; 2099097426f6SNeilBrown d--; 2100097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 2101097426f6SNeilBrown continue; 2102097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 2103d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 210444cf0f4dSMing Lei pages[idx], 2105d8f05d29SNeilBrown READ) != 0) 21069d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 210769382e85SNeilBrown } 210869382e85SNeilBrown sectors -= s; 210969382e85SNeilBrown sect += s; 211069382e85SNeilBrown idx ++; 211169382e85SNeilBrown } 211278d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 21134e4cbee9SChristoph Hellwig bio->bi_status = 0; 2114a68e5870SNeilBrown return 1; 211569382e85SNeilBrown } 2116d11c171eSNeilBrown 2117c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio) 2118a68e5870SNeilBrown { 2119a68e5870SNeilBrown /* We have read all readable devices. If we haven't 2120a68e5870SNeilBrown * got the block, then there is no hope left. 2121a68e5870SNeilBrown * If we have, then we want to do a comparison 2122a68e5870SNeilBrown * and skip the write if everything is the same. 2123a68e5870SNeilBrown * If any blocks failed to read, then we need to 2124a68e5870SNeilBrown * attempt an over-write 2125a68e5870SNeilBrown */ 2126fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2127e8096360SNeilBrown struct r1conf *conf = mddev->private; 2128a68e5870SNeilBrown int primary; 2129a68e5870SNeilBrown int i; 2130f4380a91Smajianpeng int vcnt; 2131a68e5870SNeilBrown 213230bc9b53SNeilBrown /* Fix variable parts of all bios */ 213330bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 213430bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 21354e4cbee9SChristoph Hellwig blk_status_t status; 213630bc9b53SNeilBrown struct bio *b = r1_bio->bios[i]; 213798d30c58SMing Lei struct resync_pages *rp = get_resync_pages(b); 213830bc9b53SNeilBrown if (b->bi_end_io != end_sync_read) 213930bc9b53SNeilBrown continue; 21404246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */ 21414e4cbee9SChristoph Hellwig status = b->bi_status; 214230bc9b53SNeilBrown bio_reset(b); 21434e4cbee9SChristoph Hellwig b->bi_status = status; 21444f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector + 214530bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset; 214674d46992SChristoph Hellwig bio_set_dev(b, conf->mirrors[i].rdev->bdev); 214730bc9b53SNeilBrown b->bi_end_io = end_sync_read; 214898d30c58SMing Lei rp->raid_bio = r1_bio; 214998d30c58SMing Lei b->bi_private = rp; 215030bc9b53SNeilBrown 2151fb0eb5dfSMing Lei /* initialize bvec table again */ 2152fb0eb5dfSMing Lei md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); 215330bc9b53SNeilBrown } 21548f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 2155a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 21564e4cbee9SChristoph Hellwig !r1_bio->bios[primary]->bi_status) { 2157a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 2158a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 2159a68e5870SNeilBrown break; 2160a68e5870SNeilBrown } 2161a68e5870SNeilBrown r1_bio->read_disk = primary; 21628f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 21632b070cfeSChristoph Hellwig int j = 0; 2164a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 2165a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 21664e4cbee9SChristoph Hellwig blk_status_t status = sbio->bi_status; 216744cf0f4dSMing Lei struct page **ppages = get_resync_pages(pbio)->pages; 216844cf0f4dSMing Lei struct page **spages = get_resync_pages(sbio)->pages; 216960928a91SMing Lei struct bio_vec *bi; 21708fc04e6eSMing Lei int page_len[RESYNC_PAGES] = { 0 }; 21716dc4f100SMing Lei struct bvec_iter_all iter_all; 217278d7f5f7SNeilBrown 21732aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read) 217478d7f5f7SNeilBrown continue; 21754246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */ 21764e4cbee9SChristoph Hellwig sbio->bi_status = 0; 2177a68e5870SNeilBrown 21782b070cfeSChristoph Hellwig bio_for_each_segment_all(bi, sbio, iter_all) 21792b070cfeSChristoph Hellwig page_len[j++] = bi->bv_len; 218060928a91SMing Lei 21814e4cbee9SChristoph Hellwig if (!status) { 2182a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 218344cf0f4dSMing Lei if (memcmp(page_address(ppages[j]), 218444cf0f4dSMing Lei page_address(spages[j]), 218560928a91SMing Lei page_len[j])) 2186a68e5870SNeilBrown break; 2187a68e5870SNeilBrown } 2188a68e5870SNeilBrown } else 2189a68e5870SNeilBrown j = 0; 2190a68e5870SNeilBrown if (j >= 0) 21917f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); 2192a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 21934e4cbee9SChristoph Hellwig && !status)) { 219478d7f5f7SNeilBrown /* No need to write to this device. */ 2195a68e5870SNeilBrown sbio->bi_end_io = NULL; 2196a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 219778d7f5f7SNeilBrown continue; 219878d7f5f7SNeilBrown } 2199d3b45c2aSKent Overstreet 2200d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio); 2201a68e5870SNeilBrown } 2202a68e5870SNeilBrown } 2203a68e5870SNeilBrown 22049f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 2205a68e5870SNeilBrown { 2206e8096360SNeilBrown struct r1conf *conf = mddev->private; 2207a68e5870SNeilBrown int i; 22088f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 2209037d2ff6SGuoqing Jiang struct bio *wbio; 2210a68e5870SNeilBrown 2211a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2212a68e5870SNeilBrown /* ouch - failed to read all of that. */ 2213a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 2214a68e5870SNeilBrown return; 22157ca78d57SNeilBrown 22167ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2217c95e6385SNeilBrown process_checks(r1_bio); 2218c95e6385SNeilBrown 2219d11c171eSNeilBrown /* 2220d11c171eSNeilBrown * schedule writes 2221d11c171eSNeilBrown */ 22221da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 22231da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 22241da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 22253e198f78SNeilBrown if (wbio->bi_end_io == NULL || 22263e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 22273e198f78SNeilBrown (i == r1_bio->read_disk || 22283e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 22291da177e4SLinus Torvalds continue; 2230dfcc34c9SNate Dailey if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) { 2231dfcc34c9SNate Dailey abort_sync_write(mddev, r1_bio); 22320c9d5b12SNeilBrown continue; 2233dfcc34c9SNate Dailey } 22341da177e4SLinus Torvalds 2235796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 2236212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) 2237212e7eb7SNeilBrown wbio->bi_opf |= MD_FAILFAST; 2238212e7eb7SNeilBrown 22393e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 22401da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 2241aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); 2242191ea9b2SNeilBrown 22431da177e4SLinus Torvalds generic_make_request(wbio); 22441da177e4SLinus Torvalds } 22451da177e4SLinus Torvalds 2246449808a2SHou Tao put_sync_write_buf(r1_bio, 1); 22471da177e4SLinus Torvalds } 22481da177e4SLinus Torvalds 22491da177e4SLinus Torvalds /* 22501da177e4SLinus Torvalds * This is a kernel thread which: 22511da177e4SLinus Torvalds * 22521da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 22531da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 2254d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 22551da177e4SLinus Torvalds */ 22561da177e4SLinus Torvalds 2257e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 2258867868fbSNeilBrown sector_t sect, int sectors) 2259867868fbSNeilBrown { 2260fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 2261867868fbSNeilBrown while(sectors) { 2262867868fbSNeilBrown int s = sectors; 2263867868fbSNeilBrown int d = read_disk; 2264867868fbSNeilBrown int success = 0; 2265867868fbSNeilBrown int start; 22663cb03002SNeilBrown struct md_rdev *rdev; 2267867868fbSNeilBrown 2268867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 2269867868fbSNeilBrown s = PAGE_SIZE >> 9; 2270867868fbSNeilBrown 2271867868fbSNeilBrown do { 2272d2eb35acSNeilBrown sector_t first_bad; 2273d2eb35acSNeilBrown int bad_sectors; 2274d2eb35acSNeilBrown 2275707a6a42SNeilBrown rcu_read_lock(); 2276707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2277867868fbSNeilBrown if (rdev && 2278da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 2279da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 2280da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 2281d2eb35acSNeilBrown is_badblock(rdev, sect, s, 2282707a6a42SNeilBrown &first_bad, &bad_sectors) == 0) { 2283707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2284707a6a42SNeilBrown rcu_read_unlock(); 2285707a6a42SNeilBrown if (sync_page_io(rdev, sect, s<<9, 2286796a5cf0SMike Christie conf->tmppage, REQ_OP_READ, 0, false)) 2287867868fbSNeilBrown success = 1; 2288707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2289707a6a42SNeilBrown if (success) 2290707a6a42SNeilBrown break; 2291707a6a42SNeilBrown } else 2292707a6a42SNeilBrown rcu_read_unlock(); 2293867868fbSNeilBrown d++; 22948f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 2295867868fbSNeilBrown d = 0; 2296867868fbSNeilBrown } while (!success && d != read_disk); 2297867868fbSNeilBrown 2298867868fbSNeilBrown if (!success) { 2299d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 23003cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 2301d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 2302d8f05d29SNeilBrown md_error(mddev, rdev); 2303867868fbSNeilBrown break; 2304867868fbSNeilBrown } 2305867868fbSNeilBrown /* write it back and re-read */ 2306867868fbSNeilBrown start = d; 2307867868fbSNeilBrown while (d != read_disk) { 2308867868fbSNeilBrown if (d==0) 23098f19ccb2SNeilBrown d = conf->raid_disks * 2; 2310867868fbSNeilBrown d--; 2311707a6a42SNeilBrown rcu_read_lock(); 2312707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2313867868fbSNeilBrown if (rdev && 2314707a6a42SNeilBrown !test_bit(Faulty, &rdev->flags)) { 2315707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2316707a6a42SNeilBrown rcu_read_unlock(); 2317d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 2318d8f05d29SNeilBrown conf->tmppage, WRITE); 2319707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2320707a6a42SNeilBrown } else 2321707a6a42SNeilBrown rcu_read_unlock(); 2322867868fbSNeilBrown } 2323867868fbSNeilBrown d = start; 2324867868fbSNeilBrown while (d != read_disk) { 2325867868fbSNeilBrown char b[BDEVNAME_SIZE]; 2326867868fbSNeilBrown if (d==0) 23278f19ccb2SNeilBrown d = conf->raid_disks * 2; 2328867868fbSNeilBrown d--; 2329707a6a42SNeilBrown rcu_read_lock(); 2330707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2331867868fbSNeilBrown if (rdev && 2332b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) { 2333707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2334707a6a42SNeilBrown rcu_read_unlock(); 2335d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 2336d8f05d29SNeilBrown conf->tmppage, READ)) { 2337867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 23381d41c216SNeilBrown pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %s)\n", 2339867868fbSNeilBrown mdname(mddev), s, 2340969b755aSRandy Dunlap (unsigned long long)(sect + 2341969b755aSRandy Dunlap rdev->data_offset), 2342867868fbSNeilBrown bdevname(rdev->bdev, b)); 2343867868fbSNeilBrown } 2344707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2345707a6a42SNeilBrown } else 2346707a6a42SNeilBrown rcu_read_unlock(); 2347867868fbSNeilBrown } 2348867868fbSNeilBrown sectors -= s; 2349867868fbSNeilBrown sect += s; 2350867868fbSNeilBrown } 2351867868fbSNeilBrown } 2352867868fbSNeilBrown 23539f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2354cd5ff9a1SNeilBrown { 2355fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2356e8096360SNeilBrown struct r1conf *conf = mddev->private; 23573cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2358cd5ff9a1SNeilBrown 2359cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2360cd5ff9a1SNeilBrown * we just recently had a write error. 2361cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2362cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2363cd5ff9a1SNeilBrown * a bad block. 2364cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2365cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2366cd5ff9a1SNeilBrown * 2367cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2368cd5ff9a1SNeilBrown */ 2369cd5ff9a1SNeilBrown 2370cd5ff9a1SNeilBrown int block_sectors; 2371cd5ff9a1SNeilBrown sector_t sector; 2372cd5ff9a1SNeilBrown int sectors; 2373cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2374cd5ff9a1SNeilBrown int ok = 1; 2375cd5ff9a1SNeilBrown 2376cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2377cd5ff9a1SNeilBrown return 0; 2378cd5ff9a1SNeilBrown 2379ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift, 2380ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9); 2381cd5ff9a1SNeilBrown sector = r1_bio->sector; 2382cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2383cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2384cd5ff9a1SNeilBrown - sector; 2385cd5ff9a1SNeilBrown 2386cd5ff9a1SNeilBrown while (sect_to_write) { 2387cd5ff9a1SNeilBrown struct bio *wbio; 2388cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2389cd5ff9a1SNeilBrown sectors = sect_to_write; 2390cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2391cd5ff9a1SNeilBrown 2392b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2393841c1316SMing Lei wbio = bio_clone_fast(r1_bio->behind_master_bio, 2394841c1316SMing Lei GFP_NOIO, 2395afeee514SKent Overstreet &mddev->bio_set); 2396b783863fSKent Overstreet } else { 2397d7a10308SMing Lei wbio = bio_clone_fast(r1_bio->master_bio, GFP_NOIO, 2398afeee514SKent Overstreet &mddev->bio_set); 2399b783863fSKent Overstreet } 2400b783863fSKent Overstreet 2401796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 24024f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector; 24034f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9; 2404cd5ff9a1SNeilBrown 24056678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors); 24064f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset; 240774d46992SChristoph Hellwig bio_set_dev(wbio, rdev->bdev); 24084e49ea4aSMike Christie 24094e49ea4aSMike Christie if (submit_bio_wait(wbio) < 0) 2410cd5ff9a1SNeilBrown /* failure! */ 2411cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2412cd5ff9a1SNeilBrown sectors, 0) 2413cd5ff9a1SNeilBrown && ok; 2414cd5ff9a1SNeilBrown 2415cd5ff9a1SNeilBrown bio_put(wbio); 2416cd5ff9a1SNeilBrown sect_to_write -= sectors; 2417cd5ff9a1SNeilBrown sector += sectors; 2418cd5ff9a1SNeilBrown sectors = block_sectors; 2419cd5ff9a1SNeilBrown } 2420cd5ff9a1SNeilBrown return ok; 2421cd5ff9a1SNeilBrown } 2422cd5ff9a1SNeilBrown 2423e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 242462096bceSNeilBrown { 242562096bceSNeilBrown int m; 242662096bceSNeilBrown int s = r1_bio->sectors; 24278f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 24283cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 242962096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 243062096bceSNeilBrown if (bio->bi_end_io == NULL) 243162096bceSNeilBrown continue; 24324e4cbee9SChristoph Hellwig if (!bio->bi_status && 243362096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2434c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 243562096bceSNeilBrown } 24364e4cbee9SChristoph Hellwig if (bio->bi_status && 243762096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 243862096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 243962096bceSNeilBrown md_error(conf->mddev, rdev); 244062096bceSNeilBrown } 244162096bceSNeilBrown } 244262096bceSNeilBrown put_buf(r1_bio); 244362096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 244462096bceSNeilBrown } 244562096bceSNeilBrown 2446e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 244762096bceSNeilBrown { 2448fd76863eScolyli@suse.de int m, idx; 244955ce74d4SNeilBrown bool fail = false; 2450fd76863eScolyli@suse.de 24518f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 245262096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 24533cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 245462096bceSNeilBrown rdev_clear_badblocks(rdev, 245562096bceSNeilBrown r1_bio->sector, 2456c6563a8cSNeilBrown r1_bio->sectors, 0); 245762096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 245862096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 245962096bceSNeilBrown /* This drive got a write error. We need to 246062096bceSNeilBrown * narrow down and record precise write 246162096bceSNeilBrown * errors. 246262096bceSNeilBrown */ 246355ce74d4SNeilBrown fail = true; 246462096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 246562096bceSNeilBrown md_error(conf->mddev, 246662096bceSNeilBrown conf->mirrors[m].rdev); 246762096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 246862096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 246962096bceSNeilBrown } 247062096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 247162096bceSNeilBrown conf->mddev); 247262096bceSNeilBrown } 247355ce74d4SNeilBrown if (fail) { 247455ce74d4SNeilBrown spin_lock_irq(&conf->device_lock); 247555ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list); 2476fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2477824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 247855ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock); 2479824e47daScolyli@suse.de /* 2480824e47daScolyli@suse.de * In case freeze_array() is waiting for condition 2481824e47daScolyli@suse.de * get_unqueued_pending() == extra to be true. 2482824e47daScolyli@suse.de */ 2483824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 248455ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread); 2485bd8688a1SNeilBrown } else { 2486bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2487bd8688a1SNeilBrown close_write(r1_bio); 248862096bceSNeilBrown raid_end_bio_io(r1_bio); 248962096bceSNeilBrown } 2490bd8688a1SNeilBrown } 249162096bceSNeilBrown 2492e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 249362096bceSNeilBrown { 2494fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 249562096bceSNeilBrown struct bio *bio; 24963cb03002SNeilBrown struct md_rdev *rdev; 249762096bceSNeilBrown 249862096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 249962096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 250062096bceSNeilBrown * the block and we can fix it. 250162096bceSNeilBrown * We freeze all other IO, and try reading the block from 250262096bceSNeilBrown * other devices. When we find one, we re-write 250362096bceSNeilBrown * and check it that fixes the read error. 250462096bceSNeilBrown * This is all done synchronously while the array is 250562096bceSNeilBrown * frozen 250662096bceSNeilBrown */ 25077449f699STomasz Majchrzak 25087449f699STomasz Majchrzak bio = r1_bio->bios[r1_bio->read_disk]; 25097449f699STomasz Majchrzak bio_put(bio); 25107449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = NULL; 25117449f699STomasz Majchrzak 25122e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 25132e52d449SNeilBrown if (mddev->ro == 0 25142e52d449SNeilBrown && !test_bit(FailFast, &rdev->flags)) { 2515e2d59925SNeilBrown freeze_array(conf, 1); 251662096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 251762096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 251862096bceSNeilBrown unfreeze_array(conf); 2519b33d1062SGioh Kim } else if (mddev->ro == 0 && test_bit(FailFast, &rdev->flags)) { 2520b33d1062SGioh Kim md_error(mddev, rdev); 25217449f699STomasz Majchrzak } else { 25227449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; 25237449f699STomasz Majchrzak } 25247449f699STomasz Majchrzak 25252e52d449SNeilBrown rdev_dec_pending(rdev, conf->mddev); 2526689389a0SNeilBrown allow_barrier(conf, r1_bio->sector); 2527689389a0SNeilBrown bio = r1_bio->master_bio; 252862096bceSNeilBrown 2529689389a0SNeilBrown /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ 2530689389a0SNeilBrown r1_bio->state = 0; 2531689389a0SNeilBrown raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); 2532109e3765SNeilBrown } 253362096bceSNeilBrown 25344ed8731dSShaohua Li static void raid1d(struct md_thread *thread) 25351da177e4SLinus Torvalds { 25364ed8731dSShaohua Li struct mddev *mddev = thread->mddev; 25379f2c9d12SNeilBrown struct r1bio *r1_bio; 25381da177e4SLinus Torvalds unsigned long flags; 2539e8096360SNeilBrown struct r1conf *conf = mddev->private; 25401da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2541e1dfa0a2SNeilBrown struct blk_plug plug; 2542fd76863eScolyli@suse.de int idx; 25431da177e4SLinus Torvalds 25441da177e4SLinus Torvalds md_check_recovery(mddev); 25451da177e4SLinus Torvalds 254655ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) && 25472953079cSShaohua Li !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { 254855ce74d4SNeilBrown LIST_HEAD(tmp); 254955ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 2550fd76863eScolyli@suse.de if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 2551fd76863eScolyli@suse.de list_splice_init(&conf->bio_end_io_list, &tmp); 255255ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 255355ce74d4SNeilBrown while (!list_empty(&tmp)) { 2554a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio, 2555a452744bSMikulas Patocka retry_list); 255655ce74d4SNeilBrown list_del(&r1_bio->retry_list); 2557fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2558824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 2559bd8688a1SNeilBrown if (mddev->degraded) 2560bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 2561bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2562bd8688a1SNeilBrown close_write(r1_bio); 256355ce74d4SNeilBrown raid_end_bio_io(r1_bio); 256455ce74d4SNeilBrown } 256555ce74d4SNeilBrown } 256655ce74d4SNeilBrown 2567e1dfa0a2SNeilBrown blk_start_plug(&plug); 25681da177e4SLinus Torvalds for (;;) { 2569a35e63efSNeilBrown 25707eaceaccSJens Axboe flush_pending_writes(conf); 2571a35e63efSNeilBrown 25721da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2573a35e63efSNeilBrown if (list_empty(head)) { 2574191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 25751da177e4SLinus Torvalds break; 2576a35e63efSNeilBrown } 25779f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 25781da177e4SLinus Torvalds list_del(head->prev); 2579fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2580824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 25811da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 25821da177e4SLinus Torvalds 25831da177e4SLinus Torvalds mddev = r1_bio->mddev; 2584070ec55dSNeilBrown conf = mddev->private; 25854367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2586d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 258762096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 258862096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 258962096bceSNeilBrown else 25901da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2591cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 259262096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 259362096bceSNeilBrown handle_write_finished(conf, r1_bio); 259462096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 259562096bceSNeilBrown handle_read_error(conf, r1_bio); 2596d2eb35acSNeilBrown else 2597c230e7e5SNeilBrown WARN_ON_ONCE(1); 259862096bceSNeilBrown 25991d9d5241SNeilBrown cond_resched(); 26002953079cSShaohua Li if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) 2601de393cdeSNeilBrown md_check_recovery(mddev); 26021da177e4SLinus Torvalds } 2603e1dfa0a2SNeilBrown blk_finish_plug(&plug); 26041da177e4SLinus Torvalds } 26051da177e4SLinus Torvalds 2606e8096360SNeilBrown static int init_resync(struct r1conf *conf) 26071da177e4SLinus Torvalds { 26081da177e4SLinus Torvalds int buffs; 26091da177e4SLinus Torvalds 26101da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 2611afeee514SKent Overstreet BUG_ON(mempool_initialized(&conf->r1buf_pool)); 2612afeee514SKent Overstreet 2613afeee514SKent Overstreet return mempool_init(&conf->r1buf_pool, buffs, r1buf_pool_alloc, 2614afeee514SKent Overstreet r1buf_pool_free, conf->poolinfo); 26151da177e4SLinus Torvalds } 26161da177e4SLinus Torvalds 2617208410b5SShaohua Li static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) 2618208410b5SShaohua Li { 2619afeee514SKent Overstreet struct r1bio *r1bio = mempool_alloc(&conf->r1buf_pool, GFP_NOIO); 2620208410b5SShaohua Li struct resync_pages *rps; 2621208410b5SShaohua Li struct bio *bio; 2622208410b5SShaohua Li int i; 2623208410b5SShaohua Li 2624208410b5SShaohua Li for (i = conf->poolinfo->raid_disks; i--; ) { 2625208410b5SShaohua Li bio = r1bio->bios[i]; 2626208410b5SShaohua Li rps = bio->bi_private; 2627208410b5SShaohua Li bio_reset(bio); 2628208410b5SShaohua Li bio->bi_private = rps; 2629208410b5SShaohua Li } 2630208410b5SShaohua Li r1bio->master_bio = NULL; 2631208410b5SShaohua Li return r1bio; 2632208410b5SShaohua Li } 2633208410b5SShaohua Li 26341da177e4SLinus Torvalds /* 26351da177e4SLinus Torvalds * perform a "sync" on one "block" 26361da177e4SLinus Torvalds * 26371da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 26381da177e4SLinus Torvalds * requests - conflict with active sync requests. 26391da177e4SLinus Torvalds * 26401da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 26411da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 26421da177e4SLinus Torvalds */ 26431da177e4SLinus Torvalds 2644849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 2645849674e4SShaohua Li int *skipped) 26461da177e4SLinus Torvalds { 2647e8096360SNeilBrown struct r1conf *conf = mddev->private; 26489f2c9d12SNeilBrown struct r1bio *r1_bio; 26491da177e4SLinus Torvalds struct bio *bio; 26501da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 26513e198f78SNeilBrown int disk = -1; 26521da177e4SLinus Torvalds int i; 26533e198f78SNeilBrown int wonly = -1; 26543e198f78SNeilBrown int write_targets = 0, read_targets = 0; 265557dab0bdSNeilBrown sector_t sync_blocks; 2656e3b9703eSNeilBrown int still_degraded = 0; 265706f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 265806f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 2659fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 2660022e510fSMing Lei int page_idx = 0; 26611da177e4SLinus Torvalds 2662afeee514SKent Overstreet if (!mempool_initialized(&conf->r1buf_pool)) 26631da177e4SLinus Torvalds if (init_resync(conf)) 266457afd89fSNeilBrown return 0; 26651da177e4SLinus Torvalds 266658c0fed4SAndre Noll max_sector = mddev->dev_sectors; 26671da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2668191ea9b2SNeilBrown /* If we aborted, we need to abort the 2669191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2670191ea9b2SNeilBrown * only be one in raid1 resync. 2671191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2672191ea9b2SNeilBrown */ 26736a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 2674e64e4018SAndy Shevchenko md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2675191ea9b2SNeilBrown &sync_blocks, 1); 26766a806c51SNeilBrown else /* completed sync */ 2677191ea9b2SNeilBrown conf->fullsync = 0; 26786a806c51SNeilBrown 2679e64e4018SAndy Shevchenko md_bitmap_close_sync(mddev->bitmap); 26801da177e4SLinus Torvalds close_sync(conf); 2681c40f341fSGoldwyn Rodrigues 2682c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) { 2683c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0; 2684c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0; 2685c40f341fSGoldwyn Rodrigues } 26861da177e4SLinus Torvalds return 0; 26871da177e4SLinus Torvalds } 26881da177e4SLinus Torvalds 268907d84d10SNeilBrown if (mddev->bitmap == NULL && 269007d84d10SNeilBrown mddev->recovery_cp == MaxSector && 26916394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 269207d84d10SNeilBrown conf->fullsync == 0) { 269307d84d10SNeilBrown *skipped = 1; 269407d84d10SNeilBrown return max_sector - sector_nr; 269507d84d10SNeilBrown } 26966394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 26976394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 26986394cca5SNeilBrown */ 2699e64e4018SAndy Shevchenko if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2700e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2701191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2702191ea9b2SNeilBrown *skipped = 1; 2703191ea9b2SNeilBrown return sync_blocks; 2704191ea9b2SNeilBrown } 270517999be4SNeilBrown 27067ac50447STomasz Majchrzak /* 27077ac50447STomasz Majchrzak * If there is non-resync activity waiting for a turn, then let it 27087ac50447STomasz Majchrzak * though before starting on this new sync request. 27097ac50447STomasz Majchrzak */ 2710824e47daScolyli@suse.de if (atomic_read(&conf->nr_waiting[idx])) 27117ac50447STomasz Majchrzak schedule_timeout_uninterruptible(1); 27127ac50447STomasz Majchrzak 2713c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against 2714c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS 2715c40f341fSGoldwyn Rodrigues */ 2716c40f341fSGoldwyn Rodrigues 2717e64e4018SAndy Shevchenko md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, 2718c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); 271917999be4SNeilBrown 27208c242593SYufen Yu 27218c242593SYufen Yu if (raise_barrier(conf, sector_nr)) 27228c242593SYufen Yu return 0; 27238c242593SYufen Yu 27248c242593SYufen Yu r1_bio = raid1_alloc_init_r1buf(conf); 27251da177e4SLinus Torvalds 27263e198f78SNeilBrown rcu_read_lock(); 27273e198f78SNeilBrown /* 27283e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 27293e198f78SNeilBrown * we might want to read from a different device. So we 27303e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 27313e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 27323e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 27333e198f78SNeilBrown * is OK. 27343e198f78SNeilBrown */ 27351da177e4SLinus Torvalds 27361da177e4SLinus Torvalds r1_bio->mddev = mddev; 27371da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2738191ea9b2SNeilBrown r1_bio->state = 0; 27391da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 2740fd76863eScolyli@suse.de /* make sure good_sectors won't go across barrier unit boundary */ 2741fd76863eScolyli@suse.de good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); 27421da177e4SLinus Torvalds 27438f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 27443cb03002SNeilBrown struct md_rdev *rdev; 27451da177e4SLinus Torvalds bio = r1_bio->bios[i]; 27461da177e4SLinus Torvalds 27473e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 27483e198f78SNeilBrown if (rdev == NULL || 27493e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 27508f19ccb2SNeilBrown if (i < conf->raid_disks) 2751e3b9703eSNeilBrown still_degraded = 1; 27523e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 2753796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 27541da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 27551da177e4SLinus Torvalds write_targets ++; 27563e198f78SNeilBrown } else { 27573e198f78SNeilBrown /* may need to read from here */ 275806f60385SNeilBrown sector_t first_bad = MaxSector; 275906f60385SNeilBrown int bad_sectors; 276006f60385SNeilBrown 276106f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 276206f60385SNeilBrown &first_bad, &bad_sectors)) { 276306f60385SNeilBrown if (first_bad > sector_nr) 276406f60385SNeilBrown good_sectors = first_bad - sector_nr; 276506f60385SNeilBrown else { 276606f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 276706f60385SNeilBrown if (min_bad == 0 || 276806f60385SNeilBrown min_bad > bad_sectors) 276906f60385SNeilBrown min_bad = bad_sectors; 277006f60385SNeilBrown } 277106f60385SNeilBrown } 277206f60385SNeilBrown if (sector_nr < first_bad) { 27733e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 27743e198f78SNeilBrown if (wonly < 0) 27753e198f78SNeilBrown wonly = i; 27763e198f78SNeilBrown } else { 27773e198f78SNeilBrown if (disk < 0) 27783e198f78SNeilBrown disk = i; 27793e198f78SNeilBrown } 2780796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, 0); 278106f60385SNeilBrown bio->bi_end_io = end_sync_read; 27823e198f78SNeilBrown read_targets++; 2783d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) && 2784d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 2785d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 2786d57368afSAlexander Lyakas /* 2787d57368afSAlexander Lyakas * The device is suitable for reading (InSync), 2788d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them, 2789d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave 2790d57368afSAlexander Lyakas * this device alone for this sync request. 2791d57368afSAlexander Lyakas */ 2792796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 2793d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write; 2794d57368afSAlexander Lyakas write_targets++; 27953e198f78SNeilBrown } 279606f60385SNeilBrown } 2797028288dfSZhiqiang Liu if (rdev && bio->bi_end_io) { 27983e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 27994f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; 280074d46992SChristoph Hellwig bio_set_dev(bio, rdev->bdev); 28012e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) 28022e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 28031da177e4SLinus Torvalds } 280406f60385SNeilBrown } 28053e198f78SNeilBrown rcu_read_unlock(); 28063e198f78SNeilBrown if (disk < 0) 28073e198f78SNeilBrown disk = wonly; 28083e198f78SNeilBrown r1_bio->read_disk = disk; 2809191ea9b2SNeilBrown 281006f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 281106f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 281206f60385SNeilBrown * need to mark them bad on all write targets 281306f60385SNeilBrown */ 281406f60385SNeilBrown int ok = 1; 28158f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 281606f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2817a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 281806f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 281906f60385SNeilBrown min_bad, 0 282006f60385SNeilBrown ) && ok; 282106f60385SNeilBrown } 28222953079cSShaohua Li set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 282306f60385SNeilBrown *skipped = 1; 282406f60385SNeilBrown put_buf(r1_bio); 282506f60385SNeilBrown 282606f60385SNeilBrown if (!ok) { 282706f60385SNeilBrown /* Cannot record the badblocks, so need to 282806f60385SNeilBrown * abort the resync. 282906f60385SNeilBrown * If there are multiple read targets, could just 283006f60385SNeilBrown * fail the really bad ones ??? 283106f60385SNeilBrown */ 283206f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 283306f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 283406f60385SNeilBrown return 0; 283506f60385SNeilBrown } else 283606f60385SNeilBrown return min_bad; 283706f60385SNeilBrown 283806f60385SNeilBrown } 283906f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 284006f60385SNeilBrown /* only resync enough to reach the next bad->good 284106f60385SNeilBrown * transition */ 284206f60385SNeilBrown good_sectors = min_bad; 284306f60385SNeilBrown } 284406f60385SNeilBrown 28453e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 28463e198f78SNeilBrown /* extra read targets are also write targets */ 28473e198f78SNeilBrown write_targets += read_targets-1; 28483e198f78SNeilBrown 28493e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 28501da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 28511da177e4SLinus Torvalds * drives must be failed - so we are finished 28521da177e4SLinus Torvalds */ 2853b7219ccbSNeilBrown sector_t rv; 2854b7219ccbSNeilBrown if (min_bad > 0) 2855b7219ccbSNeilBrown max_sector = sector_nr + min_bad; 2856b7219ccbSNeilBrown rv = max_sector - sector_nr; 285757afd89fSNeilBrown *skipped = 1; 28581da177e4SLinus Torvalds put_buf(r1_bio); 28591da177e4SLinus Torvalds return rv; 28601da177e4SLinus Torvalds } 28611da177e4SLinus Torvalds 2862c6207277SNeilBrown if (max_sector > mddev->resync_max) 2863c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 286406f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 286506f60385SNeilBrown max_sector = sector_nr + good_sectors; 28661da177e4SLinus Torvalds nr_sectors = 0; 2867289e99e8SNeilBrown sync_blocks = 0; 28681da177e4SLinus Torvalds do { 28691da177e4SLinus Torvalds struct page *page; 28701da177e4SLinus Torvalds int len = PAGE_SIZE; 28711da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 28721da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 28731da177e4SLinus Torvalds if (len == 0) 28741da177e4SLinus Torvalds break; 2875ab7a30c7SNeilBrown if (sync_blocks == 0) { 2876e64e4018SAndy Shevchenko if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, 2877e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2878e5de485fSNeilBrown !conf->fullsync && 2879e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2880191ea9b2SNeilBrown break; 28817571ae88SNeilBrown if ((len >> 9) > sync_blocks) 28826a806c51SNeilBrown len = sync_blocks<<9; 2883ab7a30c7SNeilBrown } 2884191ea9b2SNeilBrown 28858f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 288698d30c58SMing Lei struct resync_pages *rp; 288798d30c58SMing Lei 28881da177e4SLinus Torvalds bio = r1_bio->bios[i]; 288998d30c58SMing Lei rp = get_resync_pages(bio); 28901da177e4SLinus Torvalds if (bio->bi_end_io) { 2891022e510fSMing Lei page = resync_fetch_page(rp, page_idx); 2892c85ba149SMing Lei 2893c85ba149SMing Lei /* 2894c85ba149SMing Lei * won't fail because the vec table is big 2895c85ba149SMing Lei * enough to hold all these pages 2896c85ba149SMing Lei */ 2897c85ba149SMing Lei bio_add_page(bio, page, len, 0); 28981da177e4SLinus Torvalds } 28991da177e4SLinus Torvalds } 29001da177e4SLinus Torvalds nr_sectors += len>>9; 29011da177e4SLinus Torvalds sector_nr += len>>9; 2902191ea9b2SNeilBrown sync_blocks -= (len>>9); 2903022e510fSMing Lei } while (++page_idx < RESYNC_PAGES); 290498d30c58SMing Lei 29051da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 29061da177e4SLinus Torvalds 2907c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) && 2908c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) { 2909c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed; 2910c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; 2911c40f341fSGoldwyn Rodrigues /* Send resync message */ 2912c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev, 2913c40f341fSGoldwyn Rodrigues conf->cluster_sync_low, 2914c40f341fSGoldwyn Rodrigues conf->cluster_sync_high); 2915c40f341fSGoldwyn Rodrigues } 2916c40f341fSGoldwyn Rodrigues 2917d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2918d11c171eSNeilBrown * compare 2919d11c171eSNeilBrown */ 2920d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2921d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 29222d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2923d11c171eSNeilBrown bio = r1_bio->bios[i]; 2924d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 29252d4f4f33SNeilBrown read_targets--; 292674d46992SChristoph Hellwig md_sync_acct_bio(bio, nr_sectors); 29272e52d449SNeilBrown if (read_targets == 1) 29282e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 29291da177e4SLinus Torvalds generic_make_request(bio); 2930d11c171eSNeilBrown } 2931d11c171eSNeilBrown } 2932d11c171eSNeilBrown } else { 2933d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2934d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 293574d46992SChristoph Hellwig md_sync_acct_bio(bio, nr_sectors); 29362e52d449SNeilBrown if (read_targets == 1) 29372e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2938d11c171eSNeilBrown generic_make_request(bio); 2939d11c171eSNeilBrown } 29401da177e4SLinus Torvalds return nr_sectors; 29411da177e4SLinus Torvalds } 29421da177e4SLinus Torvalds 2943fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 294480c3a6ceSDan Williams { 294580c3a6ceSDan Williams if (sectors) 294680c3a6ceSDan Williams return sectors; 294780c3a6ceSDan Williams 294880c3a6ceSDan Williams return mddev->dev_sectors; 294980c3a6ceSDan Williams } 295080c3a6ceSDan Williams 2951e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 29521da177e4SLinus Torvalds { 2953e8096360SNeilBrown struct r1conf *conf; 2954709ae487SNeilBrown int i; 29550eaf822cSJonathan Brassow struct raid1_info *disk; 29563cb03002SNeilBrown struct md_rdev *rdev; 2957709ae487SNeilBrown int err = -ENOMEM; 29581da177e4SLinus Torvalds 2959e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 29601da177e4SLinus Torvalds if (!conf) 2961709ae487SNeilBrown goto abort; 29621da177e4SLinus Torvalds 2963fd76863eScolyli@suse.de conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, 2964824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2965fd76863eScolyli@suse.de if (!conf->nr_pending) 2966fd76863eScolyli@suse.de goto abort; 2967fd76863eScolyli@suse.de 2968fd76863eScolyli@suse.de conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, 2969824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2970fd76863eScolyli@suse.de if (!conf->nr_waiting) 2971fd76863eScolyli@suse.de goto abort; 2972fd76863eScolyli@suse.de 2973fd76863eScolyli@suse.de conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, 2974824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2975fd76863eScolyli@suse.de if (!conf->nr_queued) 2976fd76863eScolyli@suse.de goto abort; 2977fd76863eScolyli@suse.de 2978fd76863eScolyli@suse.de conf->barrier = kcalloc(BARRIER_BUCKETS_NR, 2979824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2980fd76863eScolyli@suse.de if (!conf->barrier) 2981fd76863eScolyli@suse.de goto abort; 2982fd76863eScolyli@suse.de 29836396bb22SKees Cook conf->mirrors = kzalloc(array3_size(sizeof(struct raid1_info), 29846396bb22SKees Cook mddev->raid_disks, 2), 29851da177e4SLinus Torvalds GFP_KERNEL); 29861da177e4SLinus Torvalds if (!conf->mirrors) 2987709ae487SNeilBrown goto abort; 29881da177e4SLinus Torvalds 2989ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2990ddaf22abSNeilBrown if (!conf->tmppage) 2991709ae487SNeilBrown goto abort; 2992ddaf22abSNeilBrown 2993709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 29941da177e4SLinus Torvalds if (!conf->poolinfo) 2995709ae487SNeilBrown goto abort; 29968f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 29973f677f9cSMarcos Paulo de Souza err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc, 2998c7afa803SMarcos Paulo de Souza rbio_pool_free, conf->poolinfo); 2999afeee514SKent Overstreet if (err) 3000709ae487SNeilBrown goto abort; 3001709ae487SNeilBrown 3002afeee514SKent Overstreet err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); 3003afeee514SKent Overstreet if (err) 3004c230e7e5SNeilBrown goto abort; 3005c230e7e5SNeilBrown 3006ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 30071da177e4SLinus Torvalds 3008c19d5798SNeilBrown err = -EINVAL; 3009e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 3010dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 3011709ae487SNeilBrown int disk_idx = rdev->raid_disk; 30121da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 30131da177e4SLinus Torvalds || disk_idx < 0) 30141da177e4SLinus Torvalds continue; 3015c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 301602b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx; 3017c19d5798SNeilBrown else 30181da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 30191da177e4SLinus Torvalds 3020c19d5798SNeilBrown if (disk->rdev) 3021c19d5798SNeilBrown goto abort; 30221da177e4SLinus Torvalds disk->rdev = rdev; 30231da177e4SLinus Torvalds disk->head_position = 0; 302412cee5a8SShaohua Li disk->seq_start = MaxSector; 30251da177e4SLinus Torvalds } 30261da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 30271da177e4SLinus Torvalds conf->mddev = mddev; 30281da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 302955ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list); 30301da177e4SLinus Torvalds 30311da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 303217999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 30331da177e4SLinus Torvalds 3034191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 303534db0cd6SNeilBrown conf->pending_count = 0; 3036d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 3037191ea9b2SNeilBrown 3038c19d5798SNeilBrown err = -EIO; 30398f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 30401da177e4SLinus Torvalds 30411da177e4SLinus Torvalds disk = conf->mirrors + i; 30421da177e4SLinus Torvalds 3043c19d5798SNeilBrown if (i < conf->raid_disks && 3044c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 3045c19d5798SNeilBrown /* This slot has a replacement. */ 3046c19d5798SNeilBrown if (!disk->rdev) { 3047c19d5798SNeilBrown /* No original, just make the replacement 3048c19d5798SNeilBrown * a recovering spare 3049c19d5798SNeilBrown */ 3050c19d5798SNeilBrown disk->rdev = 3051c19d5798SNeilBrown disk[conf->raid_disks].rdev; 3052c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 3053c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 3054c19d5798SNeilBrown /* Original is not in_sync - bad */ 3055c19d5798SNeilBrown goto abort; 3056c19d5798SNeilBrown } 3057c19d5798SNeilBrown 30585fd6c1dcSNeilBrown if (!disk->rdev || 30595fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 30601da177e4SLinus Torvalds disk->head_position = 0; 30614f0a5e01SJonathan Brassow if (disk->rdev && 30624f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 306317571284SNeilBrown conf->fullsync = 1; 3064be4d3280SShaohua Li } 30651da177e4SLinus Torvalds } 3066709ae487SNeilBrown 3067709ae487SNeilBrown err = -ENOMEM; 30680232605dSNeilBrown conf->thread = md_register_thread(raid1d, mddev, "raid1"); 30691d41c216SNeilBrown if (!conf->thread) 3070709ae487SNeilBrown goto abort; 3071191ea9b2SNeilBrown 3072709ae487SNeilBrown return conf; 3073709ae487SNeilBrown 3074709ae487SNeilBrown abort: 3075709ae487SNeilBrown if (conf) { 3076afeee514SKent Overstreet mempool_exit(&conf->r1bio_pool); 3077709ae487SNeilBrown kfree(conf->mirrors); 3078709ae487SNeilBrown safe_put_page(conf->tmppage); 3079709ae487SNeilBrown kfree(conf->poolinfo); 3080fd76863eScolyli@suse.de kfree(conf->nr_pending); 3081fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3082fd76863eScolyli@suse.de kfree(conf->nr_queued); 3083fd76863eScolyli@suse.de kfree(conf->barrier); 3084afeee514SKent Overstreet bioset_exit(&conf->bio_split); 3085709ae487SNeilBrown kfree(conf); 3086709ae487SNeilBrown } 3087709ae487SNeilBrown return ERR_PTR(err); 3088709ae487SNeilBrown } 3089709ae487SNeilBrown 3090afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv); 3091849674e4SShaohua Li static int raid1_run(struct mddev *mddev) 3092709ae487SNeilBrown { 3093e8096360SNeilBrown struct r1conf *conf; 3094709ae487SNeilBrown int i; 30953cb03002SNeilBrown struct md_rdev *rdev; 30965220ea1eSmajianpeng int ret; 30972ff8cc2cSShaohua Li bool discard_supported = false; 3098709ae487SNeilBrown 3099709ae487SNeilBrown if (mddev->level != 1) { 31001d41c216SNeilBrown pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", 3101709ae487SNeilBrown mdname(mddev), mddev->level); 3102709ae487SNeilBrown return -EIO; 3103709ae487SNeilBrown } 3104709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 31051d41c216SNeilBrown pr_warn("md/raid1:%s: reshape_position set but not supported\n", 3106709ae487SNeilBrown mdname(mddev)); 3107709ae487SNeilBrown return -EIO; 3108709ae487SNeilBrown } 3109a415c0f1SNeilBrown if (mddev_init_writes_pending(mddev) < 0) 3110a415c0f1SNeilBrown return -ENOMEM; 3111709ae487SNeilBrown /* 3112709ae487SNeilBrown * copy the already verified devices into our private RAID1 3113709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 3114afa0f557SNeilBrown * should be freed in raid1_free()] 3115709ae487SNeilBrown */ 3116709ae487SNeilBrown if (mddev->private == NULL) 3117709ae487SNeilBrown conf = setup_conf(mddev); 3118709ae487SNeilBrown else 3119709ae487SNeilBrown conf = mddev->private; 3120709ae487SNeilBrown 3121709ae487SNeilBrown if (IS_ERR(conf)) 3122709ae487SNeilBrown return PTR_ERR(conf); 3123709ae487SNeilBrown 31243deff1a7SChristoph Hellwig if (mddev->queue) { 31255026d7a9SH. Peter Anvin blk_queue_max_write_same_sectors(mddev->queue, 0); 31263deff1a7SChristoph Hellwig blk_queue_max_write_zeroes_sectors(mddev->queue, 0); 31273deff1a7SChristoph Hellwig } 31285026d7a9SH. Peter Anvin 3129dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 31301ed7242eSJonathan Brassow if (!mddev->gendisk) 31311ed7242eSJonathan Brassow continue; 3132709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 3133709ae487SNeilBrown rdev->data_offset << 9); 31342ff8cc2cSShaohua Li if (blk_queue_discard(bdev_get_queue(rdev->bdev))) 31352ff8cc2cSShaohua Li discard_supported = true; 3136709ae487SNeilBrown } 3137709ae487SNeilBrown 3138709ae487SNeilBrown mddev->degraded = 0; 3139709ae487SNeilBrown for (i = 0; i < conf->raid_disks; i++) 3140709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 3141709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 3142709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 3143709ae487SNeilBrown mddev->degraded++; 314407f1a685SYufen Yu /* 314507f1a685SYufen Yu * RAID1 needs at least one disk in active 314607f1a685SYufen Yu */ 314707f1a685SYufen Yu if (conf->raid_disks - mddev->degraded < 1) { 314807f1a685SYufen Yu ret = -EINVAL; 314907f1a685SYufen Yu goto abort; 315007f1a685SYufen Yu } 3151709ae487SNeilBrown 3152709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 3153709ae487SNeilBrown mddev->recovery_cp = MaxSector; 3154709ae487SNeilBrown 31558c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 31561d41c216SNeilBrown pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", 31578c6ac868SAndre Noll mdname(mddev)); 31581d41c216SNeilBrown pr_info("md/raid1:%s: active with %d out of %d mirrors\n", 31591da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 31601da177e4SLinus Torvalds mddev->raid_disks); 3161709ae487SNeilBrown 31621da177e4SLinus Torvalds /* 31631da177e4SLinus Torvalds * Ok, everything is just fine now 31641da177e4SLinus Torvalds */ 3165709ae487SNeilBrown mddev->thread = conf->thread; 3166709ae487SNeilBrown conf->thread = NULL; 3167709ae487SNeilBrown mddev->private = conf; 316846533ff7SNeilBrown set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); 3169709ae487SNeilBrown 31701f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 31711da177e4SLinus Torvalds 31721ed7242eSJonathan Brassow if (mddev->queue) { 31732ff8cc2cSShaohua Li if (discard_supported) 31748b904b5bSBart Van Assche blk_queue_flag_set(QUEUE_FLAG_DISCARD, 31752ff8cc2cSShaohua Li mddev->queue); 31762ff8cc2cSShaohua Li else 31778b904b5bSBart Van Assche blk_queue_flag_clear(QUEUE_FLAG_DISCARD, 31782ff8cc2cSShaohua Li mddev->queue); 31791ed7242eSJonathan Brassow } 31805220ea1eSmajianpeng 31815220ea1eSmajianpeng ret = md_integrity_register(mddev); 31825aa61f42SNeilBrown if (ret) { 31835aa61f42SNeilBrown md_unregister_thread(&mddev->thread); 318407f1a685SYufen Yu goto abort; 31855aa61f42SNeilBrown } 318607f1a685SYufen Yu return 0; 318707f1a685SYufen Yu 318807f1a685SYufen Yu abort: 318907f1a685SYufen Yu raid1_free(mddev, conf); 31905220ea1eSmajianpeng return ret; 31911da177e4SLinus Torvalds } 31921da177e4SLinus Torvalds 3193afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv) 31941da177e4SLinus Torvalds { 3195afa0f557SNeilBrown struct r1conf *conf = priv; 31964b6d287fSNeilBrown 3197afeee514SKent Overstreet mempool_exit(&conf->r1bio_pool); 31981da177e4SLinus Torvalds kfree(conf->mirrors); 31990fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage); 32001da177e4SLinus Torvalds kfree(conf->poolinfo); 3201fd76863eScolyli@suse.de kfree(conf->nr_pending); 3202fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3203fd76863eScolyli@suse.de kfree(conf->nr_queued); 3204fd76863eScolyli@suse.de kfree(conf->barrier); 3205afeee514SKent Overstreet bioset_exit(&conf->bio_split); 32061da177e4SLinus Torvalds kfree(conf); 32071da177e4SLinus Torvalds } 32081da177e4SLinus Torvalds 3209fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 32101da177e4SLinus Torvalds { 32111da177e4SLinus Torvalds /* no resync is happening, and there is enough space 32121da177e4SLinus Torvalds * on all devices, so we can resize. 32131da177e4SLinus Torvalds * We need to make sure resync covers any new space. 32141da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 32151da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 32161da177e4SLinus Torvalds * worth it. 32171da177e4SLinus Torvalds */ 3218a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 3219a4a6125aSNeilBrown if (mddev->external_size && 3220a4a6125aSNeilBrown mddev->array_sectors > newsize) 3221b522adcdSDan Williams return -EINVAL; 3222a4a6125aSNeilBrown if (mddev->bitmap) { 3223e64e4018SAndy Shevchenko int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); 3224a4a6125aSNeilBrown if (ret) 3225a4a6125aSNeilBrown return ret; 3226a4a6125aSNeilBrown } 3227a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 3228b522adcdSDan Williams if (sectors > mddev->dev_sectors && 3229b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 323058c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 32311da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 32321da177e4SLinus Torvalds } 3233b522adcdSDan Williams mddev->dev_sectors = sectors; 32344b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 32351da177e4SLinus Torvalds return 0; 32361da177e4SLinus Torvalds } 32371da177e4SLinus Torvalds 3238fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 32391da177e4SLinus Torvalds { 32401da177e4SLinus Torvalds /* We need to: 32411da177e4SLinus Torvalds * 1/ resize the r1bio_pool 32421da177e4SLinus Torvalds * 2/ resize conf->mirrors 32431da177e4SLinus Torvalds * 32441da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 32451da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 32461da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 32476ea9c07cSNeilBrown * 32486ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 32496ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 32501da177e4SLinus Torvalds */ 3251afeee514SKent Overstreet mempool_t newpool, oldpool; 32521da177e4SLinus Torvalds struct pool_info *newpoolinfo; 32530eaf822cSJonathan Brassow struct raid1_info *newmirrors; 3254e8096360SNeilBrown struct r1conf *conf = mddev->private; 325563c70c4fSNeilBrown int cnt, raid_disks; 3256c04be0aaSNeilBrown unsigned long flags; 32572214c260SArtur Paszkiewicz int d, d2; 3258afeee514SKent Overstreet int ret; 3259afeee514SKent Overstreet 3260afeee514SKent Overstreet memset(&newpool, 0, sizeof(newpool)); 3261afeee514SKent Overstreet memset(&oldpool, 0, sizeof(oldpool)); 32621da177e4SLinus Torvalds 326363c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 3264664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 326563c70c4fSNeilBrown mddev->layout != mddev->new_layout || 326663c70c4fSNeilBrown mddev->level != mddev->new_level) { 3267664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 326863c70c4fSNeilBrown mddev->new_layout = mddev->layout; 326963c70c4fSNeilBrown mddev->new_level = mddev->level; 327063c70c4fSNeilBrown return -EINVAL; 327163c70c4fSNeilBrown } 327263c70c4fSNeilBrown 32732214c260SArtur Paszkiewicz if (!mddev_is_clustered(mddev)) 32742214c260SArtur Paszkiewicz md_allow_write(mddev); 32752a2275d6SNeilBrown 327663c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 327763c70c4fSNeilBrown 32786ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 32796ea9c07cSNeilBrown cnt=0; 32806ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 32811da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 32826ea9c07cSNeilBrown cnt++; 32836ea9c07cSNeilBrown if (cnt > raid_disks) 32841da177e4SLinus Torvalds return -EBUSY; 32856ea9c07cSNeilBrown } 32861da177e4SLinus Torvalds 32871da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 32881da177e4SLinus Torvalds if (!newpoolinfo) 32891da177e4SLinus Torvalds return -ENOMEM; 32901da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 32918f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 32921da177e4SLinus Torvalds 32933f677f9cSMarcos Paulo de Souza ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc, 3294c7afa803SMarcos Paulo de Souza rbio_pool_free, newpoolinfo); 3295afeee514SKent Overstreet if (ret) { 32961da177e4SLinus Torvalds kfree(newpoolinfo); 3297afeee514SKent Overstreet return ret; 32981da177e4SLinus Torvalds } 32996396bb22SKees Cook newmirrors = kzalloc(array3_size(sizeof(struct raid1_info), 33006396bb22SKees Cook raid_disks, 2), 33018f19ccb2SNeilBrown GFP_KERNEL); 33021da177e4SLinus Torvalds if (!newmirrors) { 33031da177e4SLinus Torvalds kfree(newpoolinfo); 3304afeee514SKent Overstreet mempool_exit(&newpool); 33051da177e4SLinus Torvalds return -ENOMEM; 33061da177e4SLinus Torvalds } 33071da177e4SLinus Torvalds 3308e2d59925SNeilBrown freeze_array(conf, 0); 33091da177e4SLinus Torvalds 33101da177e4SLinus Torvalds /* ok, everything is stopped */ 33111da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 33121da177e4SLinus Torvalds conf->r1bio_pool = newpool; 33136ea9c07cSNeilBrown 3314a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 33153cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 3316a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 331736fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 3318a88aa786SNeilBrown rdev->raid_disk = d2; 331936fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 332036fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 33211d41c216SNeilBrown pr_warn("md/raid1:%s: cannot register rd%d\n", 332236fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 3323a88aa786SNeilBrown } 3324a88aa786SNeilBrown if (rdev) 3325a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 33266ea9c07cSNeilBrown } 33271da177e4SLinus Torvalds kfree(conf->mirrors); 33281da177e4SLinus Torvalds conf->mirrors = newmirrors; 33291da177e4SLinus Torvalds kfree(conf->poolinfo); 33301da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 33311da177e4SLinus Torvalds 3332c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 33331da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 3334c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 33351da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 333663c70c4fSNeilBrown mddev->delta_disks = 0; 33371da177e4SLinus Torvalds 3338e2d59925SNeilBrown unfreeze_array(conf); 33391da177e4SLinus Torvalds 3340985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 33411da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 33421da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 33431da177e4SLinus Torvalds 3344afeee514SKent Overstreet mempool_exit(&oldpool); 33451da177e4SLinus Torvalds return 0; 33461da177e4SLinus Torvalds } 33471da177e4SLinus Torvalds 3348b03e0ccbSNeilBrown static void raid1_quiesce(struct mddev *mddev, int quiesce) 334936fa3063SNeilBrown { 3350e8096360SNeilBrown struct r1conf *conf = mddev->private; 335136fa3063SNeilBrown 3352b03e0ccbSNeilBrown if (quiesce) 335307169fd4Smajianpeng freeze_array(conf, 0); 3354b03e0ccbSNeilBrown else 335507169fd4Smajianpeng unfreeze_array(conf); 335636fa3063SNeilBrown } 335736fa3063SNeilBrown 3358fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 3359709ae487SNeilBrown { 3360709ae487SNeilBrown /* raid1 can take over: 3361709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 3362709ae487SNeilBrown */ 3363709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 3364e8096360SNeilBrown struct r1conf *conf; 3365709ae487SNeilBrown mddev->new_level = 1; 3366709ae487SNeilBrown mddev->new_layout = 0; 3367709ae487SNeilBrown mddev->new_chunk_sectors = 0; 3368709ae487SNeilBrown conf = setup_conf(mddev); 33696995f0b2SShaohua Li if (!IS_ERR(conf)) { 337007169fd4Smajianpeng /* Array must appear to be quiesced */ 337107169fd4Smajianpeng conf->array_frozen = 1; 3372394ed8e4SShaohua Li mddev_clear_unsupported_flags(mddev, 3373394ed8e4SShaohua Li UNSUPPORTED_MDDEV_FLAGS); 33746995f0b2SShaohua Li } 3375709ae487SNeilBrown return conf; 3376709ae487SNeilBrown } 3377709ae487SNeilBrown return ERR_PTR(-EINVAL); 3378709ae487SNeilBrown } 33791da177e4SLinus Torvalds 338084fc4b56SNeilBrown static struct md_personality raid1_personality = 33811da177e4SLinus Torvalds { 33821da177e4SLinus Torvalds .name = "raid1", 33832604b703SNeilBrown .level = 1, 33841da177e4SLinus Torvalds .owner = THIS_MODULE, 3385849674e4SShaohua Li .make_request = raid1_make_request, 3386849674e4SShaohua Li .run = raid1_run, 3387afa0f557SNeilBrown .free = raid1_free, 3388849674e4SShaohua Li .status = raid1_status, 3389849674e4SShaohua Li .error_handler = raid1_error, 33901da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 33911da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 33921da177e4SLinus Torvalds .spare_active = raid1_spare_active, 3393849674e4SShaohua Li .sync_request = raid1_sync_request, 33941da177e4SLinus Torvalds .resize = raid1_resize, 339580c3a6ceSDan Williams .size = raid1_size, 339663c70c4fSNeilBrown .check_reshape = raid1_reshape, 339736fa3063SNeilBrown .quiesce = raid1_quiesce, 3398709ae487SNeilBrown .takeover = raid1_takeover, 33995c675f83SNeilBrown .congested = raid1_congested, 34001da177e4SLinus Torvalds }; 34011da177e4SLinus Torvalds 34021da177e4SLinus Torvalds static int __init raid_init(void) 34031da177e4SLinus Torvalds { 34042604b703SNeilBrown return register_md_personality(&raid1_personality); 34051da177e4SLinus Torvalds } 34061da177e4SLinus Torvalds 34071da177e4SLinus Torvalds static void raid_exit(void) 34081da177e4SLinus Torvalds { 34092604b703SNeilBrown unregister_md_personality(&raid1_personality); 34101da177e4SLinus Torvalds } 34111da177e4SLinus Torvalds 34121da177e4SLinus Torvalds module_init(raid_init); 34131da177e4SLinus Torvalds module_exit(raid_exit); 34141da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 34150efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 34161da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3417d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 34182604b703SNeilBrown MODULE_ALIAS("md-level-1"); 341934db0cd6SNeilBrown 342034db0cd6SNeilBrown module_param(max_queued_requests, int, S_IRUGO|S_IWUSR); 3421