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-- ; ) { 168066ff571SChristoph Hellwig bio = bio_kmalloc(RESYNC_PAGES, gfp_flags); 1691da177e4SLinus Torvalds if (!bio) 1701da177e4SLinus Torvalds goto out_free_bio; 171066ff571SChristoph Hellwig bio_init(bio, NULL, bio->bi_inline_vecs, RESYNC_PAGES, 0); 1721da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1731da177e4SLinus Torvalds } 1741da177e4SLinus Torvalds /* 1751da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 176d11c171eSNeilBrown * the first bio. 177d11c171eSNeilBrown * If this is a user-requested check/repair, allocate 178d11c171eSNeilBrown * RESYNC_PAGES for each bio. 1791da177e4SLinus Torvalds */ 180d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &pi->mddev->recovery)) 181da1aab3dSNeilBrown need_pages = pi->raid_disks; 182d11c171eSNeilBrown else 183da1aab3dSNeilBrown need_pages = 1; 18498d30c58SMing Lei for (j = 0; j < pi->raid_disks; j++) { 18598d30c58SMing Lei struct resync_pages *rp = &rps[j]; 1861da177e4SLinus Torvalds 18798d30c58SMing Lei bio = r1_bio->bios[j]; 18898d30c58SMing Lei 18998d30c58SMing Lei if (j < need_pages) { 19098d30c58SMing Lei if (resync_alloc_pages(rp, gfp_flags)) 191da1aab3dSNeilBrown goto out_free_pages; 19298d30c58SMing Lei } else { 19398d30c58SMing Lei memcpy(rp, &rps[0], sizeof(*rp)); 19498d30c58SMing Lei resync_get_all_pages(rp); 195d11c171eSNeilBrown } 19698d30c58SMing Lei 19798d30c58SMing Lei rp->raid_bio = r1_bio; 19898d30c58SMing Lei bio->bi_private = rp; 199d11c171eSNeilBrown } 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvalds r1_bio->master_bio = NULL; 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds return r1_bio; 2041da177e4SLinus Torvalds 205da1aab3dSNeilBrown out_free_pages: 206491221f8SGuoqing Jiang while (--j >= 0) 20798d30c58SMing Lei resync_free_pages(&rps[j]); 208da1aab3dSNeilBrown 2091da177e4SLinus Torvalds out_free_bio: 210066ff571SChristoph Hellwig while (++j < pi->raid_disks) { 211066ff571SChristoph Hellwig bio_uninit(r1_bio->bios[j]); 212066ff571SChristoph Hellwig kfree(r1_bio->bios[j]); 213066ff571SChristoph Hellwig } 21498d30c58SMing Lei kfree(rps); 21598d30c58SMing Lei 21698d30c58SMing Lei out_free_r1bio: 217c7afa803SMarcos Paulo de Souza rbio_pool_free(r1_bio, data); 2181da177e4SLinus Torvalds return NULL; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds struct pool_info *pi = data; 22498d30c58SMing Lei int i; 2259f2c9d12SNeilBrown struct r1bio *r1bio = __r1_bio; 22698d30c58SMing Lei struct resync_pages *rp = NULL; 2271da177e4SLinus Torvalds 22898d30c58SMing Lei for (i = pi->raid_disks; i--; ) { 22998d30c58SMing Lei rp = get_resync_pages(r1bio->bios[i]); 23098d30c58SMing Lei resync_free_pages(rp); 231066ff571SChristoph Hellwig bio_uninit(r1bio->bios[i]); 232066ff571SChristoph Hellwig kfree(r1bio->bios[i]); 23398d30c58SMing Lei } 23498d30c58SMing Lei 23598d30c58SMing Lei /* resync pages array stored in the 1st bio's .bi_private */ 23698d30c58SMing Lei kfree(rp); 2371da177e4SLinus Torvalds 238c7afa803SMarcos Paulo de Souza rbio_pool_free(r1bio, data); 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds 241e8096360SNeilBrown static void put_all_bios(struct r1conf *conf, struct r1bio *r1_bio) 2421da177e4SLinus Torvalds { 2431da177e4SLinus Torvalds int i; 2441da177e4SLinus Torvalds 2458f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2461da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 2474367af55SNeilBrown if (!BIO_SPECIAL(*bio)) 2481da177e4SLinus Torvalds bio_put(*bio); 2491da177e4SLinus Torvalds *bio = NULL; 2501da177e4SLinus Torvalds } 2511da177e4SLinus Torvalds } 2521da177e4SLinus Torvalds 2539f2c9d12SNeilBrown static void free_r1bio(struct r1bio *r1_bio) 2541da177e4SLinus Torvalds { 255e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 258afeee514SKent Overstreet mempool_free(r1_bio, &conf->r1bio_pool); 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 2619f2c9d12SNeilBrown static void put_buf(struct r1bio *r1_bio) 2621da177e4SLinus Torvalds { 263e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 264af5f42a7SShaohua Li sector_t sect = r1_bio->sector; 2653e198f78SNeilBrown int i; 2663e198f78SNeilBrown 2678f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 2683e198f78SNeilBrown struct bio *bio = r1_bio->bios[i]; 2693e198f78SNeilBrown if (bio->bi_end_io) 2703e198f78SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, r1_bio->mddev); 2713e198f78SNeilBrown } 2721da177e4SLinus Torvalds 273afeee514SKent Overstreet mempool_free(r1_bio, &conf->r1buf_pool); 2741da177e4SLinus Torvalds 275af5f42a7SShaohua Li lower_barrier(conf, sect); 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds 2789f2c9d12SNeilBrown static void reschedule_retry(struct r1bio *r1_bio) 2791da177e4SLinus Torvalds { 2801da177e4SLinus Torvalds unsigned long flags; 281fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 282e8096360SNeilBrown struct r1conf *conf = mddev->private; 283fd76863eScolyli@suse.de int idx; 2841da177e4SLinus Torvalds 285fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2861da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2871da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 288824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 2891da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 2901da177e4SLinus Torvalds 29117999be4SNeilBrown wake_up(&conf->wait_barrier); 2921da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds /* 2961da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored 2971da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer 2981da177e4SLinus Torvalds * cache layer. 2991da177e4SLinus Torvalds */ 3009f2c9d12SNeilBrown static void call_bio_endio(struct r1bio *r1_bio) 301d2eb35acSNeilBrown { 302d2eb35acSNeilBrown struct bio *bio = r1_bio->master_bio; 303d2eb35acSNeilBrown 304d2eb35acSNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 3054e4cbee9SChristoph Hellwig bio->bi_status = BLK_STS_IOERR; 3064246a0b6SChristoph Hellwig 3074246a0b6SChristoph Hellwig bio_endio(bio); 308d2eb35acSNeilBrown } 309d2eb35acSNeilBrown 3109f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 3111da177e4SLinus Torvalds { 3121da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 313c91114c2SDavid Jeffery struct r1conf *conf = r1_bio->mddev->private; 3141da177e4SLinus Torvalds 3154b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 3164b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 31736a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 3184b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 3194f024f37SKent Overstreet (unsigned long long) bio->bi_iter.bi_sector, 3204f024f37SKent Overstreet (unsigned long long) bio_end_sector(bio) - 1); 3214b6d287fSNeilBrown 322d2eb35acSNeilBrown call_bio_endio(r1_bio); 3234b6d287fSNeilBrown } 324c91114c2SDavid Jeffery /* 325c91114c2SDavid Jeffery * Wake up any possible resync thread that waits for the device 326c91114c2SDavid Jeffery * to go idle. All I/Os, even write-behind writes, are done. 327c91114c2SDavid Jeffery */ 328c91114c2SDavid Jeffery allow_barrier(conf, r1_bio->sector); 329c91114c2SDavid Jeffery 3301da177e4SLinus Torvalds free_r1bio(r1_bio); 3311da177e4SLinus Torvalds } 3321da177e4SLinus Torvalds 3331da177e4SLinus Torvalds /* 3341da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 3351da177e4SLinus Torvalds */ 3369f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 3371da177e4SLinus Torvalds { 338e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds conf->mirrors[disk].head_position = 3411da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 3421da177e4SLinus Torvalds } 3431da177e4SLinus Torvalds 344ba3ae3beSNamhyung Kim /* 345ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 346ba3ae3beSNamhyung Kim */ 3479f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 348ba3ae3beSNamhyung Kim { 349ba3ae3beSNamhyung Kim int mirror; 35030194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 35130194636SNeilBrown int raid_disks = conf->raid_disks; 352ba3ae3beSNamhyung Kim 3538f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 354ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 355ba3ae3beSNamhyung Kim break; 356ba3ae3beSNamhyung Kim 3578f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 358ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 359ba3ae3beSNamhyung Kim 360ba3ae3beSNamhyung Kim return mirror; 361ba3ae3beSNamhyung Kim } 362ba3ae3beSNamhyung Kim 3634246a0b6SChristoph Hellwig static void raid1_end_read_request(struct bio *bio) 3641da177e4SLinus Torvalds { 3654e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status; 3669f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 367e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 368e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds /* 3711da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3721da177e4SLinus Torvalds */ 373e5872d58SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 374ddaf22abSNeilBrown 375220946c9SNeilBrown if (uptodate) 3761da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3772e52d449SNeilBrown else if (test_bit(FailFast, &rdev->flags) && 3782e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 3792e52d449SNeilBrown /* This was a fail-fast read so we definitely 3802e52d449SNeilBrown * want to retry */ 3812e52d449SNeilBrown ; 382dd00a99eSNeilBrown else { 383dd00a99eSNeilBrown /* If all other devices have failed, we want to return 384dd00a99eSNeilBrown * the error upwards rather than fail the last device. 385dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 386dd00a99eSNeilBrown */ 387dd00a99eSNeilBrown unsigned long flags; 388dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 389dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 390dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 391e5872d58SNeilBrown test_bit(In_sync, &rdev->flags))) 392dd00a99eSNeilBrown uptodate = 1; 393dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 394dd00a99eSNeilBrown } 3951da177e4SLinus Torvalds 3967ad4d4a6SNeilBrown if (uptodate) { 3971da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 398e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 3997ad4d4a6SNeilBrown } else { 4001da177e4SLinus Torvalds /* 4011da177e4SLinus Torvalds * oops, read error: 4021da177e4SLinus Torvalds */ 403913cce5aSChristoph Hellwig pr_err_ratelimited("md/raid1:%s: %pg: rescheduling sector %llu\n", 4049dd1e2faSNeilBrown mdname(conf->mddev), 405913cce5aSChristoph Hellwig rdev->bdev, 4068bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 407d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 4081da177e4SLinus Torvalds reschedule_retry(r1_bio); 4097ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */ 4101da177e4SLinus Torvalds } 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4139f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 4144e78064fSNeilBrown { 4154e78064fSNeilBrown /* it really is the end of this request */ 4164e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 417841c1316SMing Lei bio_free_pages(r1_bio->behind_master_bio); 418841c1316SMing Lei bio_put(r1_bio->behind_master_bio); 419841c1316SMing Lei r1_bio->behind_master_bio = NULL; 4204e78064fSNeilBrown } 4214e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 422e64e4018SAndy Shevchenko md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 4234e78064fSNeilBrown r1_bio->sectors, 4244e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 425af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 4264e78064fSNeilBrown md_write_end(r1_bio->mddev); 427cd5ff9a1SNeilBrown } 428cd5ff9a1SNeilBrown 4299f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 430cd5ff9a1SNeilBrown { 431cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 432cd5ff9a1SNeilBrown return; 433cd5ff9a1SNeilBrown 434cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 435cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 436cd5ff9a1SNeilBrown else { 437cd5ff9a1SNeilBrown close_write(r1_bio); 4384367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 4394367af55SNeilBrown reschedule_retry(r1_bio); 4404367af55SNeilBrown else 4414e78064fSNeilBrown raid_end_bio_io(r1_bio); 4424e78064fSNeilBrown } 4434e78064fSNeilBrown } 4444e78064fSNeilBrown 4454246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio) 4461da177e4SLinus Torvalds { 4479f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 448e5872d58SNeilBrown int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 449e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 45004b857f7SNeilBrown struct bio *to_put = NULL; 451e5872d58SNeilBrown int mirror = find_bio_disk(r1_bio, bio); 452e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[mirror].rdev; 453e3f948cdSShaohua Li bool discard_error; 45469df9cfcSGuoqing Jiang sector_t lo = r1_bio->sector; 45569df9cfcSGuoqing Jiang sector_t hi = r1_bio->sector + r1_bio->sectors; 456e3f948cdSShaohua Li 4574e4cbee9SChristoph Hellwig discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds /* 460e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4611da177e4SLinus Torvalds */ 4624e4cbee9SChristoph Hellwig if (bio->bi_status && !discard_error) { 463e5872d58SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 464e5872d58SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 46519d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 46619d67169SNeilBrown conf->mddev->recovery); 46719d67169SNeilBrown 468212e7eb7SNeilBrown if (test_bit(FailFast, &rdev->flags) && 469212e7eb7SNeilBrown (bio->bi_opf & MD_FAILFAST) && 470212e7eb7SNeilBrown /* We never try FailFast to WriteMostly devices */ 471212e7eb7SNeilBrown !test_bit(WriteMostly, &rdev->flags)) { 472212e7eb7SNeilBrown md_error(r1_bio->mddev, rdev); 473eeba6809SYufen Yu } 474eeba6809SYufen Yu 475eeba6809SYufen Yu /* 476eeba6809SYufen Yu * When the device is faulty, it is not necessary to 477eeba6809SYufen Yu * handle write error. 478212e7eb7SNeilBrown */ 479eeba6809SYufen Yu if (!test_bit(Faulty, &rdev->flags)) 480212e7eb7SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 481212e7eb7SNeilBrown else { 4822417b986SPaul Clements /* Fail the request */ 4832417b986SPaul Clements set_bit(R1BIO_Degraded, &r1_bio->state); 484212e7eb7SNeilBrown /* Finished with this branch */ 485212e7eb7SNeilBrown r1_bio->bios[mirror] = NULL; 486212e7eb7SNeilBrown to_put = bio; 487212e7eb7SNeilBrown } 4884367af55SNeilBrown } else { 4891da177e4SLinus Torvalds /* 490e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 491e9c7469bSTejun Heo * will return a good error code for to the higher 492e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 493e9c7469bSTejun Heo * fails. 4941da177e4SLinus Torvalds * 495e9c7469bSTejun Heo * The 'master' represents the composite IO operation 496e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 497e9c7469bSTejun Heo * will wait for the 'master' bio. 4981da177e4SLinus Torvalds */ 4994367af55SNeilBrown sector_t first_bad; 5004367af55SNeilBrown int bad_sectors; 5014367af55SNeilBrown 502cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 503cd5ff9a1SNeilBrown to_put = bio; 5043056e3aeSAlex Lyakas /* 5053056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is 5063056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use 5073056e3aeSAlex Lyakas * such device for properly reading the data back (we could 5083056e3aeSAlex Lyakas * potentially use it, if the current write would have felt 5093056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't 5103056e3aeSAlex Lyakas * check this here. 5113056e3aeSAlex Lyakas */ 512e5872d58SNeilBrown if (test_bit(In_sync, &rdev->flags) && 513e5872d58SNeilBrown !test_bit(Faulty, &rdev->flags)) 5141da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 5151da177e4SLinus Torvalds 5164367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 517e5872d58SNeilBrown if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 518e3f948cdSShaohua Li &first_bad, &bad_sectors) && !discard_error) { 5194367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 5204367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 5214367af55SNeilBrown } 5224367af55SNeilBrown } 5234367af55SNeilBrown 5244b6d287fSNeilBrown if (behind) { 52569df9cfcSGuoqing Jiang if (test_bit(CollisionCheck, &rdev->flags)) 526404659cfSGuoqing Jiang remove_serial(rdev, lo, hi); 527e5872d58SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) 5284b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 5294b6d287fSNeilBrown 530e9c7469bSTejun Heo /* 531e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 532e9c7469bSTejun Heo * has safely reached all non-writemostly 533e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 534e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 535e9c7469bSTejun Heo * -EIO here, instead we'll wait 536e9c7469bSTejun Heo */ 5374b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 5384b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 5394b6d287fSNeilBrown /* Maybe we can return now */ 5404b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 5414b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 54236a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 54336a4e1feSNeilBrown " %llu-%llu\n", 5444f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector, 5454f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1); 546d2eb35acSNeilBrown call_bio_endio(r1_bio); 5474b6d287fSNeilBrown } 5484b6d287fSNeilBrown } 54969df9cfcSGuoqing Jiang } else if (rdev->mddev->serialize_policy) 55069df9cfcSGuoqing Jiang remove_serial(rdev, lo, hi); 5514367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 552e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 553e9c7469bSTejun Heo 5541da177e4SLinus Torvalds /* 5551da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 5561da177e4SLinus Torvalds * already. 5571da177e4SLinus Torvalds */ 558af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 559c70810b3SNeilBrown 56004b857f7SNeilBrown if (to_put) 56104b857f7SNeilBrown bio_put(to_put); 5621da177e4SLinus Torvalds } 5631da177e4SLinus Torvalds 564fd76863eScolyli@suse.de static sector_t align_to_barrier_unit_end(sector_t start_sector, 565fd76863eScolyli@suse.de sector_t sectors) 566fd76863eScolyli@suse.de { 567fd76863eScolyli@suse.de sector_t len; 568fd76863eScolyli@suse.de 569fd76863eScolyli@suse.de WARN_ON(sectors == 0); 570fd76863eScolyli@suse.de /* 571fd76863eScolyli@suse.de * len is the number of sectors from start_sector to end of the 572fd76863eScolyli@suse.de * barrier unit which start_sector belongs to. 573fd76863eScolyli@suse.de */ 574fd76863eScolyli@suse.de len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - 575fd76863eScolyli@suse.de start_sector; 576fd76863eScolyli@suse.de 577fd76863eScolyli@suse.de if (len > sectors) 578fd76863eScolyli@suse.de len = sectors; 579fd76863eScolyli@suse.de 580fd76863eScolyli@suse.de return len; 581fd76863eScolyli@suse.de } 582fd76863eScolyli@suse.de 5831da177e4SLinus Torvalds /* 5841da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 5851da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 5861da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 5871da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 5881da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 5891da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 5901da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 5911da177e4SLinus Torvalds * 5921da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 5931da177e4SLinus Torvalds * because position is mirror, not device based. 5941da177e4SLinus Torvalds * 5951da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 5961da177e4SLinus Torvalds */ 597e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 5981da177e4SLinus Torvalds { 599af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 600d2eb35acSNeilBrown int sectors; 601d2eb35acSNeilBrown int best_good_sectors; 6029dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 6039dedf603SShaohua Li int has_nonrot_disk; 604be4d3280SShaohua Li int disk; 60576073054SNeilBrown sector_t best_dist; 6069dedf603SShaohua Li unsigned int min_pending; 6073cb03002SNeilBrown struct md_rdev *rdev; 608f3ac8bf7SNeilBrown int choose_first; 60912cee5a8SShaohua Li int choose_next_idle; 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds rcu_read_lock(); 6121da177e4SLinus Torvalds /* 6138ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 6141da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 6151da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 6161da177e4SLinus Torvalds */ 6171da177e4SLinus Torvalds retry: 618d2eb35acSNeilBrown sectors = r1_bio->sectors; 61976073054SNeilBrown best_disk = -1; 6209dedf603SShaohua Li best_dist_disk = -1; 62176073054SNeilBrown best_dist = MaxSector; 6229dedf603SShaohua Li best_pending_disk = -1; 6239dedf603SShaohua Li min_pending = UINT_MAX; 624d2eb35acSNeilBrown best_good_sectors = 0; 6259dedf603SShaohua Li has_nonrot_disk = 0; 62612cee5a8SShaohua Li choose_next_idle = 0; 6272e52d449SNeilBrown clear_bit(R1BIO_FailFast, &r1_bio->state); 628d2eb35acSNeilBrown 6297d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) || 6307d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) && 63190382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, 6327d49ffcfSGoldwyn Rodrigues this_sector + sectors))) 6337d49ffcfSGoldwyn Rodrigues choose_first = 1; 6347d49ffcfSGoldwyn Rodrigues else 6357d49ffcfSGoldwyn Rodrigues choose_first = 0; 6361da177e4SLinus Torvalds 637be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 63876073054SNeilBrown sector_t dist; 639d2eb35acSNeilBrown sector_t first_bad; 640d2eb35acSNeilBrown int bad_sectors; 6419dedf603SShaohua Li unsigned int pending; 64212cee5a8SShaohua Li bool nonrot; 643d2eb35acSNeilBrown 644f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 645f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 646f3ac8bf7SNeilBrown || rdev == NULL 64776073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 648f3ac8bf7SNeilBrown continue; 64976073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 65076073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 65176073054SNeilBrown continue; 65276073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 65376073054SNeilBrown /* Don't balance among write-mostly, just 65476073054SNeilBrown * use the first as a last resort */ 655d1901ef0STomáš Hodek if (best_dist_disk < 0) { 656307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 657307729c8SNeilBrown &first_bad, &bad_sectors)) { 658816b0acfSWei Fang if (first_bad <= this_sector) 659307729c8SNeilBrown /* Cannot use this */ 660307729c8SNeilBrown continue; 661307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 662307729c8SNeilBrown } else 663307729c8SNeilBrown best_good_sectors = sectors; 664d1901ef0STomáš Hodek best_dist_disk = disk; 665d1901ef0STomáš Hodek best_pending_disk = disk; 666307729c8SNeilBrown } 66776073054SNeilBrown continue; 6688ddf9efeSNeilBrown } 66976073054SNeilBrown /* This is a reasonable device to use. It might 67076073054SNeilBrown * even be best. 6711da177e4SLinus Torvalds */ 672d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 673d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 674d2eb35acSNeilBrown if (best_dist < MaxSector) 675d2eb35acSNeilBrown /* already have a better device */ 676d2eb35acSNeilBrown continue; 677d2eb35acSNeilBrown if (first_bad <= this_sector) { 678d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 679d2eb35acSNeilBrown * device, then we must not read beyond 680d2eb35acSNeilBrown * bad_sectors from another device.. 681d2eb35acSNeilBrown */ 682d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 683d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 684d2eb35acSNeilBrown sectors = bad_sectors; 685d2eb35acSNeilBrown if (best_good_sectors > sectors) 686d2eb35acSNeilBrown best_good_sectors = sectors; 687d2eb35acSNeilBrown 688d2eb35acSNeilBrown } else { 689d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 690d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 691d2eb35acSNeilBrown best_good_sectors = good_sectors; 692d2eb35acSNeilBrown best_disk = disk; 693d2eb35acSNeilBrown } 694d2eb35acSNeilBrown if (choose_first) 695d2eb35acSNeilBrown break; 696d2eb35acSNeilBrown } 697d2eb35acSNeilBrown continue; 698d82dd0e3STomasz Majchrzak } else { 699d82dd0e3STomasz Majchrzak if ((sectors > best_good_sectors) && (best_disk >= 0)) 700d82dd0e3STomasz Majchrzak best_disk = -1; 701d2eb35acSNeilBrown best_good_sectors = sectors; 702d82dd0e3STomasz Majchrzak } 703d2eb35acSNeilBrown 7042e52d449SNeilBrown if (best_disk >= 0) 7052e52d449SNeilBrown /* At least two disks to choose from so failfast is OK */ 7062e52d449SNeilBrown set_bit(R1BIO_FailFast, &r1_bio->state); 7072e52d449SNeilBrown 70810f0d2a5SChristoph Hellwig nonrot = bdev_nonrot(rdev->bdev); 70912cee5a8SShaohua Li has_nonrot_disk |= nonrot; 7109dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 71176073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 71212cee5a8SShaohua Li if (choose_first) { 71376073054SNeilBrown best_disk = disk; 7141da177e4SLinus Torvalds break; 7151da177e4SLinus Torvalds } 71612cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 71712cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 71812cee5a8SShaohua Li || dist == 0) { 71912cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 72012cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 72112cee5a8SShaohua Li 72212cee5a8SShaohua Li best_disk = disk; 72312cee5a8SShaohua Li /* 72412cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 72512cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 72612cee5a8SShaohua Li * the idle disk. read_balance could already choose an 72712cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 72812cee5a8SShaohua Li * this disk. This doesn't matter because this disk 72912cee5a8SShaohua Li * will idle, next time it will be utilized after the 73012cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 73112cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 73212cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 73312cee5a8SShaohua Li * small, but not a big deal since when the second disk 73412cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 73512cee5a8SShaohua Li */ 73612cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 73712cee5a8SShaohua Li mirror->seq_start != MaxSector && 73812cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 73912cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 74012cee5a8SShaohua Li mirror->seq_start) { 74112cee5a8SShaohua Li choose_next_idle = 1; 74212cee5a8SShaohua Li continue; 74312cee5a8SShaohua Li } 74412cee5a8SShaohua Li break; 74512cee5a8SShaohua Li } 74612cee5a8SShaohua Li 74712cee5a8SShaohua Li if (choose_next_idle) 74812cee5a8SShaohua Li continue; 7499dedf603SShaohua Li 7509dedf603SShaohua Li if (min_pending > pending) { 7519dedf603SShaohua Li min_pending = pending; 7529dedf603SShaohua Li best_pending_disk = disk; 7539dedf603SShaohua Li } 7549dedf603SShaohua Li 75576073054SNeilBrown if (dist < best_dist) { 75676073054SNeilBrown best_dist = dist; 7579dedf603SShaohua Li best_dist_disk = disk; 7581da177e4SLinus Torvalds } 759f3ac8bf7SNeilBrown } 7601da177e4SLinus Torvalds 7619dedf603SShaohua Li /* 7629dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 7639dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 7649dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 7659dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 7669dedf603SShaohua Li */ 7679dedf603SShaohua Li if (best_disk == -1) { 7682e52d449SNeilBrown if (has_nonrot_disk || min_pending == 0) 7699dedf603SShaohua Li best_disk = best_pending_disk; 7709dedf603SShaohua Li else 7719dedf603SShaohua Li best_disk = best_dist_disk; 7729dedf603SShaohua Li } 7739dedf603SShaohua Li 77476073054SNeilBrown if (best_disk >= 0) { 77576073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 7768ddf9efeSNeilBrown if (!rdev) 7778ddf9efeSNeilBrown goto retry; 7788ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 779d2eb35acSNeilBrown sectors = best_good_sectors; 78012cee5a8SShaohua Li 78112cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 78212cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 78312cee5a8SShaohua Li 784be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 7851da177e4SLinus Torvalds } 7861da177e4SLinus Torvalds rcu_read_unlock(); 787d2eb35acSNeilBrown *max_sectors = sectors; 7881da177e4SLinus Torvalds 78976073054SNeilBrown return best_disk; 7901da177e4SLinus Torvalds } 7911da177e4SLinus Torvalds 792673ca68dSNeilBrown static void flush_bio_list(struct r1conf *conf, struct bio *bio) 793a35e63efSNeilBrown { 794673ca68dSNeilBrown /* flush any pending bitmap writes to disk before proceeding w/ I/O */ 7959efcc2c3SYu Kuai raid1_prepare_flush_writes(conf->mddev->bitmap); 79634db0cd6SNeilBrown wake_up(&conf->wait_barrier); 797a35e63efSNeilBrown 798a35e63efSNeilBrown while (bio) { /* submit pending writes */ 799a35e63efSNeilBrown struct bio *next = bio->bi_next; 8008295efbeSYu Kuai 8018295efbeSYu Kuai raid1_submit_write(bio); 802a35e63efSNeilBrown bio = next; 8035fa4f8baSHannes Reinecke cond_resched(); 804a35e63efSNeilBrown } 805673ca68dSNeilBrown } 806673ca68dSNeilBrown 807673ca68dSNeilBrown static void flush_pending_writes(struct r1conf *conf) 808673ca68dSNeilBrown { 809673ca68dSNeilBrown /* Any writes that have been queued but are awaiting 810673ca68dSNeilBrown * bitmap updates get flushed here. 811673ca68dSNeilBrown */ 812673ca68dSNeilBrown spin_lock_irq(&conf->device_lock); 813673ca68dSNeilBrown 814673ca68dSNeilBrown if (conf->pending_bio_list.head) { 81518022a1bSShaohua Li struct blk_plug plug; 816673ca68dSNeilBrown struct bio *bio; 81718022a1bSShaohua Li 818673ca68dSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 819673ca68dSNeilBrown spin_unlock_irq(&conf->device_lock); 820474beb57SNeilBrown 821474beb57SNeilBrown /* 822474beb57SNeilBrown * As this is called in a wait_event() loop (see freeze_array), 823474beb57SNeilBrown * current->state might be TASK_UNINTERRUPTIBLE which will 824474beb57SNeilBrown * cause a warning when we prepare to wait again. As it is 825474beb57SNeilBrown * rare that this path is taken, it is perfectly safe to force 826474beb57SNeilBrown * us to go around the wait_event() loop again, so the warning 827474beb57SNeilBrown * is a false-positive. Silence the warning by resetting 828474beb57SNeilBrown * thread state 829474beb57SNeilBrown */ 830474beb57SNeilBrown __set_current_state(TASK_RUNNING); 83118022a1bSShaohua Li blk_start_plug(&plug); 832673ca68dSNeilBrown flush_bio_list(conf, bio); 83318022a1bSShaohua Li blk_finish_plug(&plug); 834a35e63efSNeilBrown } else 835a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 8367eaceaccSJens Axboe } 8377eaceaccSJens Axboe 83817999be4SNeilBrown /* Barriers.... 83917999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 84017999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 84117999be4SNeilBrown * To do this we raise a 'barrier'. 84217999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 84317999be4SNeilBrown * to count how many activities are happening which preclude 84417999be4SNeilBrown * normal IO. 84517999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 84617999be4SNeilBrown * i.e. if nr_pending == 0. 84717999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 84817999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 84917999be4SNeilBrown * is ready, no other operations which require a barrier will start 85017999be4SNeilBrown * until the IO request has had a chance. 85117999be4SNeilBrown * 85217999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 85317999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 85417999be4SNeilBrown * allow_barrier when it has finished its IO. 85517999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 85617999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 85717999be4SNeilBrown * lower_barrier when the particular background IO completes. 8584675719dSHou Tao * 8594675719dSHou Tao * If resync/recovery is interrupted, returns -EINTR; 8604675719dSHou Tao * Otherwise, returns 0. 8611da177e4SLinus Torvalds */ 8624675719dSHou Tao static int raise_barrier(struct r1conf *conf, sector_t sector_nr) 8631da177e4SLinus Torvalds { 864fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 865fd76863eScolyli@suse.de 8661da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 8671da177e4SLinus Torvalds 86817999be4SNeilBrown /* Wait until no block IO is waiting */ 869824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 870824e47daScolyli@suse.de !atomic_read(&conf->nr_waiting[idx]), 871eed8c02eSLukas Czerner conf->resync_lock); 87217999be4SNeilBrown 87317999be4SNeilBrown /* block any new IO from starting */ 874824e47daScolyli@suse.de atomic_inc(&conf->barrier[idx]); 875824e47daScolyli@suse.de /* 876824e47daScolyli@suse.de * In raise_barrier() we firstly increase conf->barrier[idx] then 877824e47daScolyli@suse.de * check conf->nr_pending[idx]. In _wait_barrier() we firstly 878824e47daScolyli@suse.de * increase conf->nr_pending[idx] then check conf->barrier[idx]. 879824e47daScolyli@suse.de * A memory barrier here to make sure conf->nr_pending[idx] won't 880824e47daScolyli@suse.de * be fetched before conf->barrier[idx] is increased. Otherwise 881824e47daScolyli@suse.de * there will be a race between raise_barrier() and _wait_barrier(). 882824e47daScolyli@suse.de */ 883824e47daScolyli@suse.de smp_mb__after_atomic(); 88417999be4SNeilBrown 88579ef3a8aSmajianpeng /* For these conditions we must wait: 88679ef3a8aSmajianpeng * A: while the array is in frozen state 887fd76863eScolyli@suse.de * B: while conf->nr_pending[idx] is not 0, meaning regular I/O 888fd76863eScolyli@suse.de * existing in corresponding I/O barrier bucket. 889fd76863eScolyli@suse.de * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches 890fd76863eScolyli@suse.de * max resync count which allowed on current I/O barrier bucket. 89179ef3a8aSmajianpeng */ 89217999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 8938c242593SYufen Yu (!conf->array_frozen && 894824e47daScolyli@suse.de !atomic_read(&conf->nr_pending[idx]) && 8958c242593SYufen Yu atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH) || 8968c242593SYufen Yu test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery), 897eed8c02eSLukas Czerner conf->resync_lock); 89817999be4SNeilBrown 8998c242593SYufen Yu if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { 9008c242593SYufen Yu atomic_dec(&conf->barrier[idx]); 9018c242593SYufen Yu spin_unlock_irq(&conf->resync_lock); 9028c242593SYufen Yu wake_up(&conf->wait_barrier); 9038c242593SYufen Yu return -EINTR; 9048c242593SYufen Yu } 9058c242593SYufen Yu 90643ac9b84SXiao Ni atomic_inc(&conf->nr_sync_pending); 9071da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 9088c242593SYufen Yu 9098c242593SYufen Yu return 0; 9101da177e4SLinus Torvalds } 9111da177e4SLinus Torvalds 912fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr) 91317999be4SNeilBrown { 914fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 915fd76863eScolyli@suse.de 916824e47daScolyli@suse.de BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); 917fd76863eScolyli@suse.de 918824e47daScolyli@suse.de atomic_dec(&conf->barrier[idx]); 91943ac9b84SXiao Ni atomic_dec(&conf->nr_sync_pending); 92017999be4SNeilBrown wake_up(&conf->wait_barrier); 92117999be4SNeilBrown } 92217999be4SNeilBrown 9235aa70503SVishal Verma static bool _wait_barrier(struct r1conf *conf, int idx, bool nowait) 92417999be4SNeilBrown { 9255aa70503SVishal Verma bool ret = true; 9265aa70503SVishal Verma 927824e47daScolyli@suse.de /* 928824e47daScolyli@suse.de * We need to increase conf->nr_pending[idx] very early here, 929824e47daScolyli@suse.de * then raise_barrier() can be blocked when it waits for 930824e47daScolyli@suse.de * conf->nr_pending[idx] to be 0. Then we can avoid holding 931824e47daScolyli@suse.de * conf->resync_lock when there is no barrier raised in same 932824e47daScolyli@suse.de * barrier unit bucket. Also if the array is frozen, I/O 933824e47daScolyli@suse.de * should be blocked until array is unfrozen. 934824e47daScolyli@suse.de */ 935824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 936824e47daScolyli@suse.de /* 937824e47daScolyli@suse.de * In _wait_barrier() we firstly increase conf->nr_pending[idx], then 938824e47daScolyli@suse.de * check conf->barrier[idx]. In raise_barrier() we firstly increase 939824e47daScolyli@suse.de * conf->barrier[idx], then check conf->nr_pending[idx]. A memory 940824e47daScolyli@suse.de * barrier is necessary here to make sure conf->barrier[idx] won't be 941824e47daScolyli@suse.de * fetched before conf->nr_pending[idx] is increased. Otherwise there 942824e47daScolyli@suse.de * will be a race between _wait_barrier() and raise_barrier(). 943824e47daScolyli@suse.de */ 944824e47daScolyli@suse.de smp_mb__after_atomic(); 94579ef3a8aSmajianpeng 946824e47daScolyli@suse.de /* 947824e47daScolyli@suse.de * Don't worry about checking two atomic_t variables at same time 948824e47daScolyli@suse.de * here. If during we check conf->barrier[idx], the array is 949824e47daScolyli@suse.de * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is 950824e47daScolyli@suse.de * 0, it is safe to return and make the I/O continue. Because the 951824e47daScolyli@suse.de * array is frozen, all I/O returned here will eventually complete 952824e47daScolyli@suse.de * or be queued, no race will happen. See code comment in 953824e47daScolyli@suse.de * frozen_array(). 954824e47daScolyli@suse.de */ 955824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen) && 956824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx])) 9575aa70503SVishal Verma return ret; 958824e47daScolyli@suse.de 959824e47daScolyli@suse.de /* 960824e47daScolyli@suse.de * After holding conf->resync_lock, conf->nr_pending[idx] 961824e47daScolyli@suse.de * should be decreased before waiting for barrier to drop. 962824e47daScolyli@suse.de * Otherwise, we may encounter a race condition because 963824e47daScolyli@suse.de * raise_barrer() might be waiting for conf->nr_pending[idx] 964824e47daScolyli@suse.de * to be 0 at same time. 965824e47daScolyli@suse.de */ 966824e47daScolyli@suse.de spin_lock_irq(&conf->resync_lock); 967824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 968824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 969824e47daScolyli@suse.de /* 970824e47daScolyli@suse.de * In case freeze_array() is waiting for 971824e47daScolyli@suse.de * get_unqueued_pending() == extra 972824e47daScolyli@suse.de */ 973824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 974824e47daScolyli@suse.de /* Wait for the barrier in same barrier unit bucket to drop. */ 9755aa70503SVishal Verma 9765aa70503SVishal Verma /* Return false when nowait flag is set */ 9775aa70503SVishal Verma if (nowait) { 9785aa70503SVishal Verma ret = false; 9795aa70503SVishal Verma } else { 980824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 981824e47daScolyli@suse.de !conf->array_frozen && 982824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx]), 983824e47daScolyli@suse.de conf->resync_lock); 984824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 98579ef3a8aSmajianpeng } 98679ef3a8aSmajianpeng 9875aa70503SVishal Verma atomic_dec(&conf->nr_waiting[idx]); 9885aa70503SVishal Verma spin_unlock_irq(&conf->resync_lock); 9895aa70503SVishal Verma return ret; 9905aa70503SVishal Verma } 9915aa70503SVishal Verma 9925aa70503SVishal Verma static bool wait_read_barrier(struct r1conf *conf, sector_t sector_nr, bool nowait) 99379ef3a8aSmajianpeng { 994fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 9955aa70503SVishal Verma bool ret = true; 99679ef3a8aSmajianpeng 997824e47daScolyli@suse.de /* 998824e47daScolyli@suse.de * Very similar to _wait_barrier(). The difference is, for read 999824e47daScolyli@suse.de * I/O we don't need wait for sync I/O, but if the whole array 1000824e47daScolyli@suse.de * is frozen, the read I/O still has to wait until the array is 1001824e47daScolyli@suse.de * unfrozen. Since there is no ordering requirement with 1002824e47daScolyli@suse.de * conf->barrier[idx] here, memory barrier is unnecessary as well. 1003824e47daScolyli@suse.de */ 1004824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 1005824e47daScolyli@suse.de 1006824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen)) 10075aa70503SVishal Verma return ret; 100817999be4SNeilBrown 100917999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 1010824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 1011824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 1012824e47daScolyli@suse.de /* 1013824e47daScolyli@suse.de * In case freeze_array() is waiting for 1014824e47daScolyli@suse.de * get_unqueued_pending() == extra 1015d6b42dcbSNeilBrown */ 101617999be4SNeilBrown wake_up(&conf->wait_barrier); 1017824e47daScolyli@suse.de /* Wait for array to be unfrozen */ 10185aa70503SVishal Verma 10195aa70503SVishal Verma /* Return false when nowait flag is set */ 10205aa70503SVishal Verma if (nowait) { 10215aa70503SVishal Verma /* Return false when nowait flag is set */ 10225aa70503SVishal Verma ret = false; 10235aa70503SVishal Verma } else { 1024824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 1025fd76863eScolyli@suse.de !conf->array_frozen, 10261da177e4SLinus Torvalds conf->resync_lock); 1027824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 102817999be4SNeilBrown } 102917999be4SNeilBrown 10305aa70503SVishal Verma atomic_dec(&conf->nr_waiting[idx]); 10315aa70503SVishal Verma spin_unlock_irq(&conf->resync_lock); 10325aa70503SVishal Verma return ret; 10335aa70503SVishal Verma } 10345aa70503SVishal Verma 10355aa70503SVishal Verma static bool wait_barrier(struct r1conf *conf, sector_t sector_nr, bool nowait) 1036fd76863eScolyli@suse.de { 1037fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1038fd76863eScolyli@suse.de 10395aa70503SVishal Verma return _wait_barrier(conf, idx, nowait); 1040fd76863eScolyli@suse.de } 1041fd76863eScolyli@suse.de 1042fd76863eScolyli@suse.de static void _allow_barrier(struct r1conf *conf, int idx) 104317999be4SNeilBrown { 1044824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 104517999be4SNeilBrown wake_up(&conf->wait_barrier); 104617999be4SNeilBrown } 104717999be4SNeilBrown 1048fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr) 1049fd76863eScolyli@suse.de { 1050fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1051fd76863eScolyli@suse.de 1052fd76863eScolyli@suse.de _allow_barrier(conf, idx); 1053fd76863eScolyli@suse.de } 1054fd76863eScolyli@suse.de 1055fd76863eScolyli@suse.de /* conf->resync_lock should be held */ 1056fd76863eScolyli@suse.de static int get_unqueued_pending(struct r1conf *conf) 1057fd76863eScolyli@suse.de { 1058fd76863eScolyli@suse.de int idx, ret; 1059fd76863eScolyli@suse.de 106043ac9b84SXiao Ni ret = atomic_read(&conf->nr_sync_pending); 106143ac9b84SXiao Ni for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1062824e47daScolyli@suse.de ret += atomic_read(&conf->nr_pending[idx]) - 1063824e47daScolyli@suse.de atomic_read(&conf->nr_queued[idx]); 1064fd76863eScolyli@suse.de 1065fd76863eScolyli@suse.de return ret; 106617999be4SNeilBrown } 106717999be4SNeilBrown 1068e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra) 1069ddaf22abSNeilBrown { 1070fd76863eScolyli@suse.de /* Stop sync I/O and normal I/O and wait for everything to 107111353b9dSZhilong Liu * go quiet. 1072fd76863eScolyli@suse.de * This is called in two situations: 1073fd76863eScolyli@suse.de * 1) management command handlers (reshape, remove disk, quiesce). 1074fd76863eScolyli@suse.de * 2) one normal I/O request failed. 1075fd76863eScolyli@suse.de 1076fd76863eScolyli@suse.de * After array_frozen is set to 1, new sync IO will be blocked at 1077fd76863eScolyli@suse.de * raise_barrier(), and new normal I/O will blocked at _wait_barrier() 1078fd76863eScolyli@suse.de * or wait_read_barrier(). The flying I/Os will either complete or be 1079fd76863eScolyli@suse.de * queued. When everything goes quite, there are only queued I/Os left. 1080fd76863eScolyli@suse.de 1081fd76863eScolyli@suse.de * Every flying I/O contributes to a conf->nr_pending[idx], idx is the 1082fd76863eScolyli@suse.de * barrier bucket index which this I/O request hits. When all sync and 1083fd76863eScolyli@suse.de * normal I/O are queued, sum of all conf->nr_pending[] will match sum 1084fd76863eScolyli@suse.de * of all conf->nr_queued[]. But normal I/O failure is an exception, 1085fd76863eScolyli@suse.de * in handle_read_error(), we may call freeze_array() before trying to 1086fd76863eScolyli@suse.de * fix the read error. In this case, the error read I/O is not queued, 1087fd76863eScolyli@suse.de * so get_unqueued_pending() == 1. 1088fd76863eScolyli@suse.de * 1089fd76863eScolyli@suse.de * Therefore before this function returns, we need to wait until 1090fd76863eScolyli@suse.de * get_unqueued_pendings(conf) gets equal to extra. For 1091fd76863eScolyli@suse.de * normal I/O context, extra is 1, in rested situations extra is 0. 1092ddaf22abSNeilBrown */ 1093ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1094b364e3d0Smajianpeng conf->array_frozen = 1; 1095578b54adSNeilBrown raid1_log(conf->mddev, "wait freeze"); 1096fd76863eScolyli@suse.de wait_event_lock_irq_cmd( 1097fd76863eScolyli@suse.de conf->wait_barrier, 1098fd76863eScolyli@suse.de get_unqueued_pending(conf) == extra, 1099ddaf22abSNeilBrown conf->resync_lock, 1100c3b328acSNeilBrown flush_pending_writes(conf)); 1101ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1102ddaf22abSNeilBrown } 1103e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 1104ddaf22abSNeilBrown { 1105ddaf22abSNeilBrown /* reverse the effect of the freeze */ 1106ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1107b364e3d0Smajianpeng conf->array_frozen = 0; 1108ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1109824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 1110ddaf22abSNeilBrown } 1111ddaf22abSNeilBrown 111216d56e2fSShaohua Li static void alloc_behind_master_bio(struct r1bio *r1_bio, 1113cb83efcfSNeilBrown struct bio *bio) 11144b6d287fSNeilBrown { 1115cb83efcfSNeilBrown int size = bio->bi_iter.bi_size; 1116841c1316SMing Lei unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 1117841c1316SMing Lei int i = 0; 1118841c1316SMing Lei struct bio *behind_bio = NULL; 11194b6d287fSNeilBrown 1120609be106SChristoph Hellwig behind_bio = bio_alloc_bioset(NULL, vcnt, 0, GFP_NOIO, 1121609be106SChristoph Hellwig &r1_bio->mddev->bio_set); 1122841c1316SMing Lei if (!behind_bio) 112316d56e2fSShaohua Li return; 1124841c1316SMing Lei 112541743c1fSShaohua Li /* discard op, we don't support writezero/writesame yet */ 112616d56e2fSShaohua Li if (!bio_has_data(bio)) { 112716d56e2fSShaohua Li behind_bio->bi_iter.bi_size = size; 112841743c1fSShaohua Li goto skip_copy; 112916d56e2fSShaohua Li } 113041743c1fSShaohua Li 1131841c1316SMing Lei while (i < vcnt && size) { 1132841c1316SMing Lei struct page *page; 1133841c1316SMing Lei int len = min_t(int, PAGE_SIZE, size); 1134841c1316SMing Lei 1135841c1316SMing Lei page = alloc_page(GFP_NOIO); 1136841c1316SMing Lei if (unlikely(!page)) 1137841c1316SMing Lei goto free_pages; 1138841c1316SMing Lei 1139b42473cdSJohannes Thumshirn if (!bio_add_page(behind_bio, page, len, 0)) { 1140b42473cdSJohannes Thumshirn put_page(page); 1141b42473cdSJohannes Thumshirn goto free_pages; 1142b42473cdSJohannes Thumshirn } 1143841c1316SMing Lei 1144841c1316SMing Lei size -= len; 1145841c1316SMing Lei i++; 11464b6d287fSNeilBrown } 11474b6d287fSNeilBrown 1148cb83efcfSNeilBrown bio_copy_data(behind_bio, bio); 114941743c1fSShaohua Li skip_copy: 115056a64c17SLuis de Bethencourt r1_bio->behind_master_bio = behind_bio; 1151841c1316SMing Lei set_bit(R1BIO_BehindIO, &r1_bio->state); 1152841c1316SMing Lei 115316d56e2fSShaohua Li return; 1154841c1316SMing Lei 1155841c1316SMing Lei free_pages: 11564f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n", 11574f024f37SKent Overstreet bio->bi_iter.bi_size); 1158841c1316SMing Lei bio_free_pages(behind_bio); 115916d56e2fSShaohua Li bio_put(behind_bio); 11604b6d287fSNeilBrown } 11614b6d287fSNeilBrown 1162f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) 1163f54a9d0eSNeilBrown { 1164f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, 1165f54a9d0eSNeilBrown cb); 1166f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data; 1167f54a9d0eSNeilBrown struct r1conf *conf = mddev->private; 1168f54a9d0eSNeilBrown struct bio *bio; 1169f54a9d0eSNeilBrown 11709efcc2c3SYu Kuai if (from_schedule) { 1171f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock); 1172f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending); 1173f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock); 1174ee0b0244SNeilBrown wake_up(&conf->wait_barrier); 1175f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread); 1176f54a9d0eSNeilBrown kfree(plug); 1177f54a9d0eSNeilBrown return; 1178f54a9d0eSNeilBrown } 1179f54a9d0eSNeilBrown 1180f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */ 1181f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending); 1182673ca68dSNeilBrown flush_bio_list(conf, bio); 1183f54a9d0eSNeilBrown kfree(plug); 1184f54a9d0eSNeilBrown } 1185f54a9d0eSNeilBrown 1186689389a0SNeilBrown static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) 1187689389a0SNeilBrown { 1188689389a0SNeilBrown r1_bio->master_bio = bio; 1189689389a0SNeilBrown r1_bio->sectors = bio_sectors(bio); 1190689389a0SNeilBrown r1_bio->state = 0; 1191689389a0SNeilBrown r1_bio->mddev = mddev; 1192689389a0SNeilBrown r1_bio->sector = bio->bi_iter.bi_sector; 1193689389a0SNeilBrown } 1194689389a0SNeilBrown 1195fd76863eScolyli@suse.de static inline struct r1bio * 1196689389a0SNeilBrown alloc_r1bio(struct mddev *mddev, struct bio *bio) 1197fd76863eScolyli@suse.de { 1198fd76863eScolyli@suse.de struct r1conf *conf = mddev->private; 1199fd76863eScolyli@suse.de struct r1bio *r1_bio; 1200fd76863eScolyli@suse.de 1201afeee514SKent Overstreet r1_bio = mempool_alloc(&conf->r1bio_pool, GFP_NOIO); 1202689389a0SNeilBrown /* Ensure no bio records IO_BLOCKED */ 1203689389a0SNeilBrown memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); 1204689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio); 1205fd76863eScolyli@suse.de return r1_bio; 1206fd76863eScolyli@suse.de } 1207fd76863eScolyli@suse.de 1208c230e7e5SNeilBrown static void raid1_read_request(struct mddev *mddev, struct bio *bio, 1209689389a0SNeilBrown int max_read_sectors, struct r1bio *r1_bio) 12101da177e4SLinus Torvalds { 1211e8096360SNeilBrown struct r1conf *conf = mddev->private; 12120eaf822cSJonathan Brassow struct raid1_info *mirror; 12131da177e4SLinus Torvalds struct bio *read_bio; 12143b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 12153c5e514dSBart Van Assche const enum req_op op = bio_op(bio); 12163c5e514dSBart Van Assche const blk_opf_t do_sync = bio->bi_opf & REQ_SYNC; 12171f68f0c4SNeilBrown int max_sectors; 1218d2eb35acSNeilBrown int rdisk; 12199b8ae7b9SGuoqing Jiang bool r1bio_existed = !!r1_bio; 1220689389a0SNeilBrown char b[BDEVNAME_SIZE]; 1221689389a0SNeilBrown 1222689389a0SNeilBrown /* 1223689389a0SNeilBrown * If r1_bio is set, we are blocking the raid1d thread 1224689389a0SNeilBrown * so there is a tiny risk of deadlock. So ask for 1225689389a0SNeilBrown * emergency memory if needed. 1226689389a0SNeilBrown */ 1227689389a0SNeilBrown gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; 1228689389a0SNeilBrown 12299b8ae7b9SGuoqing Jiang if (r1bio_existed) { 1230689389a0SNeilBrown /* Need to get the block device name carefully */ 1231689389a0SNeilBrown struct md_rdev *rdev; 1232689389a0SNeilBrown rcu_read_lock(); 1233689389a0SNeilBrown rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); 1234689389a0SNeilBrown if (rdev) 1235900d156bSChristoph Hellwig snprintf(b, sizeof(b), "%pg", rdev->bdev); 1236689389a0SNeilBrown else 1237689389a0SNeilBrown strcpy(b, "???"); 1238689389a0SNeilBrown rcu_read_unlock(); 1239689389a0SNeilBrown } 1240d2eb35acSNeilBrown 1241fd76863eScolyli@suse.de /* 1242fd76863eScolyli@suse.de * Still need barrier for READ in case that whole 1243fd76863eScolyli@suse.de * array is frozen. 1244fd76863eScolyli@suse.de */ 12455aa70503SVishal Verma if (!wait_read_barrier(conf, bio->bi_iter.bi_sector, 12465aa70503SVishal Verma bio->bi_opf & REQ_NOWAIT)) { 12475aa70503SVishal Verma bio_wouldblock_error(bio); 12485aa70503SVishal Verma return; 12495aa70503SVishal Verma } 12503b046a97SRobert LeBlanc 1251689389a0SNeilBrown if (!r1_bio) 1252689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio); 1253689389a0SNeilBrown else 1254689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio); 1255c230e7e5SNeilBrown r1_bio->sectors = max_read_sectors; 1256fd76863eScolyli@suse.de 1257fd76863eScolyli@suse.de /* 1258fd76863eScolyli@suse.de * make_request() can abort the operation when read-ahead is being 1259fd76863eScolyli@suse.de * used and no empty request is available. 1260fd76863eScolyli@suse.de */ 1261d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 12621da177e4SLinus Torvalds 12631da177e4SLinus Torvalds if (rdisk < 0) { 12641da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 12659b8ae7b9SGuoqing Jiang if (r1bio_existed) { 1266689389a0SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 1267689389a0SNeilBrown mdname(mddev), 1268689389a0SNeilBrown b, 1269689389a0SNeilBrown (unsigned long long)r1_bio->sector); 1270689389a0SNeilBrown } 12711da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 12725a7bbad2SChristoph Hellwig return; 12731da177e4SLinus Torvalds } 12741da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 12751da177e4SLinus Torvalds 12769b8ae7b9SGuoqing Jiang if (r1bio_existed) 1277913cce5aSChristoph Hellwig pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %pg\n", 1278689389a0SNeilBrown mdname(mddev), 1279689389a0SNeilBrown (unsigned long long)r1_bio->sector, 1280913cce5aSChristoph Hellwig mirror->rdev->bdev); 1281689389a0SNeilBrown 1282e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1283e555190dSNeilBrown bitmap) { 12843b046a97SRobert LeBlanc /* 12853b046a97SRobert LeBlanc * Reading from a write-mostly device must take care not to 12863b046a97SRobert LeBlanc * over-take any writes that are 'behind' 1287e555190dSNeilBrown */ 1288578b54adSNeilBrown raid1_log(mddev, "wait behind writes"); 1289e555190dSNeilBrown wait_event(bitmap->behind_wait, 1290e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 1291e555190dSNeilBrown } 1292c230e7e5SNeilBrown 1293c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1294c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1295afeee514SKent Overstreet gfp, &conf->bio_split); 1296c230e7e5SNeilBrown bio_chain(split, bio); 1297ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 1298c230e7e5SNeilBrown bio = split; 1299c230e7e5SNeilBrown r1_bio->master_bio = bio; 1300c230e7e5SNeilBrown r1_bio->sectors = max_sectors; 1301c230e7e5SNeilBrown } 1302c230e7e5SNeilBrown 13031da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 1304*bb2a9aceSYu Kuai if (!r1bio_existed) { 1305*bb2a9aceSYu Kuai md_account_bio(mddev, &bio); 1306*bb2a9aceSYu Kuai r1_bio->master_bio = bio; 1307*bb2a9aceSYu Kuai } 1308abfc426dSChristoph Hellwig read_bio = bio_alloc_clone(mirror->rdev->bdev, bio, gfp, 1309abfc426dSChristoph Hellwig &mddev->bio_set); 13101da177e4SLinus Torvalds 13111da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 13121da177e4SLinus Torvalds 13134f024f37SKent Overstreet read_bio->bi_iter.bi_sector = r1_bio->sector + 13144f024f37SKent Overstreet mirror->rdev->data_offset; 13151da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 1316c34b7ac6SChristoph Hellwig read_bio->bi_opf = op | do_sync; 13172e52d449SNeilBrown if (test_bit(FailFast, &mirror->rdev->flags) && 13182e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 13192e52d449SNeilBrown read_bio->bi_opf |= MD_FAILFAST; 13201da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 13211da177e4SLinus Torvalds 1322109e3765SNeilBrown if (mddev->gendisk) 13231c02fca6SChristoph Hellwig trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk), 13241c02fca6SChristoph Hellwig r1_bio->sector); 1325109e3765SNeilBrown 1326ed00aabdSChristoph Hellwig submit_bio_noacct(read_bio); 13271da177e4SLinus Torvalds } 13281da177e4SLinus Torvalds 1329c230e7e5SNeilBrown static void raid1_write_request(struct mddev *mddev, struct bio *bio, 1330c230e7e5SNeilBrown int max_write_sectors) 13313b046a97SRobert LeBlanc { 13323b046a97SRobert LeBlanc struct r1conf *conf = mddev->private; 1333fd76863eScolyli@suse.de struct r1bio *r1_bio; 13343b046a97SRobert LeBlanc int i, disks; 13353b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 13363b046a97SRobert LeBlanc unsigned long flags; 13373b046a97SRobert LeBlanc struct md_rdev *blocked_rdev; 13383b046a97SRobert LeBlanc int first_clone; 13393b046a97SRobert LeBlanc int max_sectors; 13406607cd31SGuoqing Jiang bool write_behind = false; 13413b046a97SRobert LeBlanc 1342b3143b9aSNeilBrown if (mddev_is_clustered(mddev) && 13433b046a97SRobert LeBlanc md_cluster_ops->area_resyncing(mddev, WRITE, 1344b3143b9aSNeilBrown bio->bi_iter.bi_sector, bio_end_sector(bio))) { 13453b046a97SRobert LeBlanc 13463b046a97SRobert LeBlanc DEFINE_WAIT(w); 13475aa70503SVishal Verma if (bio->bi_opf & REQ_NOWAIT) { 13485aa70503SVishal Verma bio_wouldblock_error(bio); 13495aa70503SVishal Verma return; 13505aa70503SVishal Verma } 13513b046a97SRobert LeBlanc for (;;) { 13523b046a97SRobert LeBlanc prepare_to_wait(&conf->wait_barrier, 1353ae89fd3dSMikulas Patocka &w, TASK_IDLE); 1354f81f7302SGuoqing Jiang if (!md_cluster_ops->area_resyncing(mddev, WRITE, 13553b046a97SRobert LeBlanc bio->bi_iter.bi_sector, 1356b3143b9aSNeilBrown bio_end_sector(bio))) 13573b046a97SRobert LeBlanc break; 13583b046a97SRobert LeBlanc schedule(); 13593b046a97SRobert LeBlanc } 13603b046a97SRobert LeBlanc finish_wait(&conf->wait_barrier, &w); 13613b046a97SRobert LeBlanc } 1362f81f7302SGuoqing Jiang 1363f81f7302SGuoqing Jiang /* 1364f81f7302SGuoqing Jiang * Register the new request and wait if the reconstruction 1365f81f7302SGuoqing Jiang * thread has put up a bar for new requests. 1366f81f7302SGuoqing Jiang * Continue immediately if no resync is active currently. 1367f81f7302SGuoqing Jiang */ 13685aa70503SVishal Verma if (!wait_barrier(conf, bio->bi_iter.bi_sector, 13695aa70503SVishal Verma bio->bi_opf & REQ_NOWAIT)) { 13705aa70503SVishal Verma bio_wouldblock_error(bio); 13715aa70503SVishal Verma return; 13725aa70503SVishal Verma } 1373fd76863eScolyli@suse.de 1374689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio); 1375c230e7e5SNeilBrown r1_bio->sectors = max_write_sectors; 13763b046a97SRobert LeBlanc 13771f68f0c4SNeilBrown /* first select target devices under rcu_lock and 13781da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 13791da177e4SLinus Torvalds * bios[x] to bio 13801f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 13811f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 13821f68f0c4SNeilBrown * blocks. 13831f68f0c4SNeilBrown * This potentially requires several writes to write around 13841f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 13851f68f0c4SNeilBrown * with a set of bios attached. 13861da177e4SLinus Torvalds */ 1387c3b328acSNeilBrown 13888f19ccb2SNeilBrown disks = conf->raid_disks * 2; 13896bfe0b49SDan Williams retry_write: 13906bfe0b49SDan Williams blocked_rdev = NULL; 13911da177e4SLinus Torvalds rcu_read_lock(); 13921f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 13931da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 13943cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 13956607cd31SGuoqing Jiang 13966607cd31SGuoqing Jiang /* 13976607cd31SGuoqing Jiang * The write-behind io is only attempted on drives marked as 13986607cd31SGuoqing Jiang * write-mostly, which means we could allocate write behind 13996607cd31SGuoqing Jiang * bio later. 14006607cd31SGuoqing Jiang */ 14016607cd31SGuoqing Jiang if (rdev && test_bit(WriteMostly, &rdev->flags)) 14026607cd31SGuoqing Jiang write_behind = true; 14036607cd31SGuoqing Jiang 14046bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 14056bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 14066bfe0b49SDan Williams blocked_rdev = rdev; 14076bfe0b49SDan Williams break; 14086bfe0b49SDan Williams } 14091da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 14108ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) { 14118f19ccb2SNeilBrown if (i < conf->raid_disks) 14121f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 14131f68f0c4SNeilBrown continue; 1414964147d5SNeilBrown } 14151f68f0c4SNeilBrown 14161f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 14171f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 14181f68f0c4SNeilBrown sector_t first_bad; 14191f68f0c4SNeilBrown int bad_sectors; 14201f68f0c4SNeilBrown int is_bad; 14211f68f0c4SNeilBrown 14223b046a97SRobert LeBlanc is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, 14231f68f0c4SNeilBrown &first_bad, &bad_sectors); 14241f68f0c4SNeilBrown if (is_bad < 0) { 14251f68f0c4SNeilBrown /* mustn't write here until the bad block is 14261f68f0c4SNeilBrown * acknowledged*/ 14271f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 14281f68f0c4SNeilBrown blocked_rdev = rdev; 14291f68f0c4SNeilBrown break; 14301f68f0c4SNeilBrown } 14311f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 14321f68f0c4SNeilBrown /* Cannot write here at all */ 14331f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 14341f68f0c4SNeilBrown if (bad_sectors < max_sectors) 14351f68f0c4SNeilBrown /* mustn't write more than bad_sectors 14361f68f0c4SNeilBrown * to other devices yet 14371f68f0c4SNeilBrown */ 14381f68f0c4SNeilBrown max_sectors = bad_sectors; 14391f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 14401f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 14411f68f0c4SNeilBrown * only applies if the disk is 14421f68f0c4SNeilBrown * missing, so it might be re-added, 14431f68f0c4SNeilBrown * and we want to know to recover this 14441f68f0c4SNeilBrown * chunk. 14451f68f0c4SNeilBrown * In this case the device is here, 14461f68f0c4SNeilBrown * and the fact that this chunk is not 14471f68f0c4SNeilBrown * in-sync is recorded in the bad 14481f68f0c4SNeilBrown * block log 14491f68f0c4SNeilBrown */ 14501f68f0c4SNeilBrown continue; 14511f68f0c4SNeilBrown } 14521f68f0c4SNeilBrown if (is_bad) { 14531f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 14541f68f0c4SNeilBrown if (good_sectors < max_sectors) 14551f68f0c4SNeilBrown max_sectors = good_sectors; 14561f68f0c4SNeilBrown } 14571f68f0c4SNeilBrown } 14581f68f0c4SNeilBrown r1_bio->bios[i] = bio; 14591da177e4SLinus Torvalds } 14601da177e4SLinus Torvalds rcu_read_unlock(); 14611da177e4SLinus Torvalds 14626bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 14636bfe0b49SDan Williams /* Wait for this device to become unblocked */ 14646bfe0b49SDan Williams int j; 14656bfe0b49SDan Williams 14666bfe0b49SDan Williams for (j = 0; j < i; j++) 14676bfe0b49SDan Williams if (r1_bio->bios[j]) 14686bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 14691f68f0c4SNeilBrown r1_bio->state = 0; 1470fd76863eScolyli@suse.de allow_barrier(conf, bio->bi_iter.bi_sector); 14715aa70503SVishal Verma 14725aa70503SVishal Verma if (bio->bi_opf & REQ_NOWAIT) { 14735aa70503SVishal Verma bio_wouldblock_error(bio); 14745aa70503SVishal Verma return; 14755aa70503SVishal Verma } 1476578b54adSNeilBrown raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); 14776bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 14785aa70503SVishal Verma wait_barrier(conf, bio->bi_iter.bi_sector, false); 14796bfe0b49SDan Williams goto retry_write; 14806bfe0b49SDan Williams } 14816bfe0b49SDan Williams 14826607cd31SGuoqing Jiang /* 14836607cd31SGuoqing Jiang * When using a bitmap, we may call alloc_behind_master_bio below. 14846607cd31SGuoqing Jiang * alloc_behind_master_bio allocates a copy of the data payload a page 14856607cd31SGuoqing Jiang * at a time and thus needs a new bio that can fit the whole payload 14866607cd31SGuoqing Jiang * this bio in page sized chunks. 14876607cd31SGuoqing Jiang */ 14886607cd31SGuoqing Jiang if (write_behind && bitmap) 14896607cd31SGuoqing Jiang max_sectors = min_t(int, max_sectors, 14906607cd31SGuoqing Jiang BIO_MAX_VECS * (PAGE_SIZE >> 9)); 1491c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1492c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1493afeee514SKent Overstreet GFP_NOIO, &conf->bio_split); 1494c230e7e5SNeilBrown bio_chain(split, bio); 1495ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 1496c230e7e5SNeilBrown bio = split; 1497c230e7e5SNeilBrown r1_bio->master_bio = bio; 14981f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 1499191ea9b2SNeilBrown } 15004b6d287fSNeilBrown 1501*bb2a9aceSYu Kuai md_account_bio(mddev, &bio); 1502*bb2a9aceSYu Kuai r1_bio->master_bio = bio; 15034e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 15044b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1505191ea9b2SNeilBrown 15061f68f0c4SNeilBrown first_clone = 1; 1507d8c84c4fSMing Lei 15081da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 15098e58e327SMing Lei struct bio *mbio = NULL; 151069df9cfcSGuoqing Jiang struct md_rdev *rdev = conf->mirrors[i].rdev; 15111da177e4SLinus Torvalds if (!r1_bio->bios[i]) 15121da177e4SLinus Torvalds continue; 15131da177e4SLinus Torvalds 151446669e86SSong Liu if (first_clone) { 15151f68f0c4SNeilBrown /* do behind I/O ? 15161f68f0c4SNeilBrown * Not if there are too many, or cannot 15171f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 15181f68f0c4SNeilBrown * is waiting for behind writes to flush */ 15191f68f0c4SNeilBrown if (bitmap && 152046669e86SSong Liu test_bit(WriteMostly, &rdev->flags) && 15211f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 15221f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 15238e58e327SMing Lei !waitqueue_active(&bitmap->behind_wait)) { 152416d56e2fSShaohua Li alloc_behind_master_bio(r1_bio, bio); 15258e58e327SMing Lei } 15261da177e4SLinus Torvalds 1527e64e4018SAndy Shevchenko md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors, 1528e64e4018SAndy Shevchenko test_bit(R1BIO_BehindIO, &r1_bio->state)); 15291f68f0c4SNeilBrown first_clone = 0; 15301f68f0c4SNeilBrown } 15318e58e327SMing Lei 1532841c1316SMing Lei if (r1_bio->behind_master_bio) { 1533abfc426dSChristoph Hellwig mbio = bio_alloc_clone(rdev->bdev, 1534abfc426dSChristoph Hellwig r1_bio->behind_master_bio, 1535abfc426dSChristoph Hellwig GFP_NOIO, &mddev->bio_set); 153669df9cfcSGuoqing Jiang if (test_bit(CollisionCheck, &rdev->flags)) 1537d0d2d8baSGuoqing Jiang wait_for_serialization(rdev, r1_bio); 15383e148a32SGuoqing Jiang if (test_bit(WriteMostly, &rdev->flags)) 15394b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 1540abfc426dSChristoph Hellwig } else { 1541abfc426dSChristoph Hellwig mbio = bio_alloc_clone(rdev->bdev, bio, GFP_NOIO, 1542abfc426dSChristoph Hellwig &mddev->bio_set); 1543abfc426dSChristoph Hellwig 1544abfc426dSChristoph Hellwig if (mddev->serialize_policy) 1545d0d2d8baSGuoqing Jiang wait_for_serialization(rdev, r1_bio); 1546abfc426dSChristoph Hellwig } 15474b6d287fSNeilBrown 15481f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 15491f68f0c4SNeilBrown 15502e94275eSGuoqing Jiang mbio->bi_iter.bi_sector = (r1_bio->sector + rdev->data_offset); 15511f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 1552a682e003SLinus Torvalds mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); 15532e94275eSGuoqing Jiang if (test_bit(FailFast, &rdev->flags) && 15542e94275eSGuoqing Jiang !test_bit(WriteMostly, &rdev->flags) && 1555212e7eb7SNeilBrown conf->raid_disks - mddev->degraded > 1) 1556212e7eb7SNeilBrown mbio->bi_opf |= MD_FAILFAST; 15571f68f0c4SNeilBrown mbio->bi_private = r1_bio; 15581f68f0c4SNeilBrown 15591da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1560f54a9d0eSNeilBrown 1561109e3765SNeilBrown if (mddev->gendisk) 15621c02fca6SChristoph Hellwig trace_block_bio_remap(mbio, disk_devt(mddev->gendisk), 1563109e3765SNeilBrown r1_bio->sector); 1564109e3765SNeilBrown /* flush_pending_writes() needs access to the rdev so...*/ 15652e94275eSGuoqing Jiang mbio->bi_bdev = (void *)rdev; 1566460af1f9SYu Kuai if (!raid1_add_bio_to_plug(mddev, mbio, raid1_unplug, disks)) { 156723b245c0SShaohua Li spin_lock_irqsave(&conf->device_lock, flags); 15684e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 1569191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1570b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 15714e78064fSNeilBrown } 157223b245c0SShaohua Li } 15731f68f0c4SNeilBrown 1574079fa166SNeilBrown r1_bio_write_done(r1_bio); 1575079fa166SNeilBrown 1576079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1577079fa166SNeilBrown wake_up(&conf->wait_barrier); 15781da177e4SLinus Torvalds } 15791da177e4SLinus Torvalds 1580cc27b0c7SNeilBrown static bool raid1_make_request(struct mddev *mddev, struct bio *bio) 15813b046a97SRobert LeBlanc { 1582fd76863eScolyli@suse.de sector_t sectors; 15833b046a97SRobert LeBlanc 1584775d7831SDavid Jeffery if (unlikely(bio->bi_opf & REQ_PREFLUSH) 1585775d7831SDavid Jeffery && md_flush_request(mddev, bio)) 1586cc27b0c7SNeilBrown return true; 15873b046a97SRobert LeBlanc 1588c230e7e5SNeilBrown /* 1589c230e7e5SNeilBrown * There is a limit to the maximum size, but 1590c230e7e5SNeilBrown * the read/write handler might find a lower limit 1591c230e7e5SNeilBrown * due to bad blocks. To avoid multiple splits, 1592c230e7e5SNeilBrown * we pass the maximum number of sectors down 1593c230e7e5SNeilBrown * and let the lower level perform the split. 1594c230e7e5SNeilBrown */ 1595fd76863eScolyli@suse.de sectors = align_to_barrier_unit_end( 1596fd76863eScolyli@suse.de bio->bi_iter.bi_sector, bio_sectors(bio)); 15973b046a97SRobert LeBlanc 1598c230e7e5SNeilBrown if (bio_data_dir(bio) == READ) 1599689389a0SNeilBrown raid1_read_request(mddev, bio, sectors, NULL); 1600cc27b0c7SNeilBrown else { 1601cc27b0c7SNeilBrown if (!md_write_start(mddev,bio)) 1602cc27b0c7SNeilBrown return false; 1603c230e7e5SNeilBrown raid1_write_request(mddev, bio, sectors); 16043b046a97SRobert LeBlanc } 1605cc27b0c7SNeilBrown return true; 1606cc27b0c7SNeilBrown } 16073b046a97SRobert LeBlanc 1608849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev) 16091da177e4SLinus Torvalds { 1610e8096360SNeilBrown struct r1conf *conf = mddev->private; 16111da177e4SLinus Torvalds int i; 16121da177e4SLinus Torvalds 16131da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 161411ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1615ddac7c7eSNeilBrown rcu_read_lock(); 1616ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 16173cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 16181da177e4SLinus Torvalds seq_printf(seq, "%s", 1619ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1620ddac7c7eSNeilBrown } 1621ddac7c7eSNeilBrown rcu_read_unlock(); 16221da177e4SLinus Torvalds seq_printf(seq, "]"); 16231da177e4SLinus Torvalds } 16241da177e4SLinus Torvalds 16259631abdbSMariusz Tkaczyk /** 16269631abdbSMariusz Tkaczyk * raid1_error() - RAID1 error handler. 16279631abdbSMariusz Tkaczyk * @mddev: affected md device. 16289631abdbSMariusz Tkaczyk * @rdev: member device to fail. 16299631abdbSMariusz Tkaczyk * 16309631abdbSMariusz Tkaczyk * The routine acknowledges &rdev failure and determines new @mddev state. 16319631abdbSMariusz Tkaczyk * If it failed, then: 16329631abdbSMariusz Tkaczyk * - &MD_BROKEN flag is set in &mddev->flags. 16339631abdbSMariusz Tkaczyk * - recovery is disabled. 16349631abdbSMariusz Tkaczyk * Otherwise, it must be degraded: 16359631abdbSMariusz Tkaczyk * - recovery is interrupted. 16369631abdbSMariusz Tkaczyk * - &mddev->degraded is bumped. 16379631abdbSMariusz Tkaczyk * 16389631abdbSMariusz Tkaczyk * @rdev is marked as &Faulty excluding case when array is failed and 16399631abdbSMariusz Tkaczyk * &mddev->fail_last_dev is off. 16409631abdbSMariusz Tkaczyk */ 1641849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) 16421da177e4SLinus Torvalds { 1643e8096360SNeilBrown struct r1conf *conf = mddev->private; 1644423f04d6SNeilBrown unsigned long flags; 16451da177e4SLinus Torvalds 16462e52d449SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 16479631abdbSMariusz Tkaczyk 16489631abdbSMariusz Tkaczyk if (test_bit(In_sync, &rdev->flags) && 16499631abdbSMariusz Tkaczyk (conf->raid_disks - mddev->degraded) == 1) { 16509631abdbSMariusz Tkaczyk set_bit(MD_BROKEN, &mddev->flags); 16519631abdbSMariusz Tkaczyk 16529631abdbSMariusz Tkaczyk if (!mddev->fail_last_dev) { 16535389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 16542e52d449SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16551da177e4SLinus Torvalds return; 16564044ba58SNeilBrown } 16579631abdbSMariusz Tkaczyk } 1658de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1659ebda52faSYufen Yu if (test_and_clear_bit(In_sync, &rdev->flags)) 16601da177e4SLinus Torvalds mddev->degraded++; 1661dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 1662423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16631da177e4SLinus Torvalds /* 16641da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 16651da177e4SLinus Torvalds */ 1666dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 16672953079cSShaohua Li set_mask_bits(&mddev->sb_flags, 0, 16682953079cSShaohua Li BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); 1669913cce5aSChristoph Hellwig pr_crit("md/raid1:%s: Disk failure on %pg, disabling device.\n" 1670067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 1671913cce5aSChristoph Hellwig mdname(mddev), rdev->bdev, 16729dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 16731da177e4SLinus Torvalds } 16741da177e4SLinus Torvalds 1675e8096360SNeilBrown static void print_conf(struct r1conf *conf) 16761da177e4SLinus Torvalds { 16771da177e4SLinus Torvalds int i; 16781da177e4SLinus Torvalds 16791d41c216SNeilBrown pr_debug("RAID1 conf printout:\n"); 16801da177e4SLinus Torvalds if (!conf) { 16811d41c216SNeilBrown pr_debug("(!conf)\n"); 16821da177e4SLinus Torvalds return; 16831da177e4SLinus Torvalds } 16841d41c216SNeilBrown pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 16851da177e4SLinus Torvalds conf->raid_disks); 16861da177e4SLinus Torvalds 1687ddac7c7eSNeilBrown rcu_read_lock(); 16881da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 16893cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1690ddac7c7eSNeilBrown if (rdev) 1691913cce5aSChristoph Hellwig pr_debug(" disk %d, wo:%d, o:%d, dev:%pg\n", 1692ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1693ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1694913cce5aSChristoph Hellwig rdev->bdev); 16951da177e4SLinus Torvalds } 1696ddac7c7eSNeilBrown rcu_read_unlock(); 16971da177e4SLinus Torvalds } 16981da177e4SLinus Torvalds 1699e8096360SNeilBrown static void close_sync(struct r1conf *conf) 17001da177e4SLinus Torvalds { 1701f6eca2d4SNate Dailey int idx; 1702f6eca2d4SNate Dailey 1703f6eca2d4SNate Dailey for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) { 17045aa70503SVishal Verma _wait_barrier(conf, idx, false); 1705f6eca2d4SNate Dailey _allow_barrier(conf, idx); 1706f6eca2d4SNate Dailey } 17071da177e4SLinus Torvalds 1708afeee514SKent Overstreet mempool_exit(&conf->r1buf_pool); 17091da177e4SLinus Torvalds } 17101da177e4SLinus Torvalds 1711fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 17121da177e4SLinus Torvalds { 17131da177e4SLinus Torvalds int i; 1714e8096360SNeilBrown struct r1conf *conf = mddev->private; 17156b965620SNeilBrown int count = 0; 17166b965620SNeilBrown unsigned long flags; 17171da177e4SLinus Torvalds 17181da177e4SLinus Torvalds /* 17191da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1720ddac7c7eSNeilBrown * and mark them readable. 1721ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 1722423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request 1723423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent. 17241da177e4SLinus Torvalds */ 1725423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 17261da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 17273cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 17288c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 17298c7a2c2bSNeilBrown if (repl 17301aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags) 17318c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 17328c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 17338c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 17348c7a2c2bSNeilBrown /* replacement has just become active */ 17358c7a2c2bSNeilBrown if (!rdev || 17368c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 17378c7a2c2bSNeilBrown count++; 17388c7a2c2bSNeilBrown if (rdev) { 17398c7a2c2bSNeilBrown /* Replaced device not technically 17408c7a2c2bSNeilBrown * faulty, but we need to be sure 17418c7a2c2bSNeilBrown * it gets removed and never re-added 17428c7a2c2bSNeilBrown */ 17438c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 17448c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 17458c7a2c2bSNeilBrown rdev->sysfs_state); 17468c7a2c2bSNeilBrown } 17478c7a2c2bSNeilBrown } 1748ddac7c7eSNeilBrown if (rdev 174961e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector 1750ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1751c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 17526b965620SNeilBrown count++; 1753654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 17541da177e4SLinus Torvalds } 17551da177e4SLinus Torvalds } 17566b965620SNeilBrown mddev->degraded -= count; 17576b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 17581da177e4SLinus Torvalds 17591da177e4SLinus Torvalds print_conf(conf); 17606b965620SNeilBrown return count; 17611da177e4SLinus Torvalds } 17621da177e4SLinus Torvalds 1763fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 17641da177e4SLinus Torvalds { 1765e8096360SNeilBrown struct r1conf *conf = mddev->private; 1766199050eaSNeil Brown int err = -EEXIST; 176741158c7eSNeilBrown int mirror = 0; 17680eaf822cSJonathan Brassow struct raid1_info *p; 17696c2fce2eSNeil Brown int first = 0; 177030194636SNeilBrown int last = conf->raid_disks - 1; 17711da177e4SLinus Torvalds 17725389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 17735389042fSNeilBrown return -EBUSY; 17745389042fSNeilBrown 17751501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev)) 17761501efadSDan Williams return -ENXIO; 17771501efadSDan Williams 17786c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 17796c2fce2eSNeil Brown first = last = rdev->raid_disk; 17806c2fce2eSNeil Brown 178170bcecdbSGoldwyn Rodrigues /* 178270bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk 178370bcecdbSGoldwyn Rodrigues * if possible. 178470bcecdbSGoldwyn Rodrigues */ 178570bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 && 178670bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first && 17879e753ba9SShaohua Li rdev->saved_raid_disk < conf->raid_disks && 178870bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL) 178970bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk; 179070bcecdbSGoldwyn Rodrigues 17917ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 17927ef449d1SNeilBrown p = conf->mirrors + mirror; 17937ef449d1SNeilBrown if (!p->rdev) { 17949092c02dSJonathan Brassow if (mddev->gendisk) 17958f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 17968f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 17971da177e4SLinus Torvalds 17981da177e4SLinus Torvalds p->head_position = 0; 17991da177e4SLinus Torvalds rdev->raid_disk = mirror; 1800199050eaSNeil Brown err = 0; 18016aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 18026aea114aSNeilBrown * if this was recently any drive of the array 18036aea114aSNeilBrown */ 18046aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 180541158c7eSNeilBrown conf->fullsync = 1; 1806d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 18071da177e4SLinus Torvalds break; 18081da177e4SLinus Torvalds } 18097ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 18107ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 18117ef449d1SNeilBrown /* Add this device as a replacement */ 18127ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 18137ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 18147ef449d1SNeilBrown rdev->raid_disk = mirror; 18157ef449d1SNeilBrown err = 0; 18167ef449d1SNeilBrown conf->fullsync = 1; 18177ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 18187ef449d1SNeilBrown break; 18197ef449d1SNeilBrown } 18207ef449d1SNeilBrown } 18211da177e4SLinus Torvalds print_conf(conf); 1822199050eaSNeil Brown return err; 18231da177e4SLinus Torvalds } 18241da177e4SLinus Torvalds 1825b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 18261da177e4SLinus Torvalds { 1827e8096360SNeilBrown struct r1conf *conf = mddev->private; 18281da177e4SLinus Torvalds int err = 0; 1829b8321b68SNeilBrown int number = rdev->raid_disk; 18300eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 18311da177e4SLinus Torvalds 1832b014f14cSNeilBrown if (rdev != p->rdev) 1833b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1834b014f14cSNeilBrown 18351da177e4SLinus Torvalds print_conf(conf); 1836b8321b68SNeilBrown if (rdev == p->rdev) { 1837b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 18381da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 18391da177e4SLinus Torvalds err = -EBUSY; 18401da177e4SLinus Torvalds goto abort; 18411da177e4SLinus Torvalds } 1842046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1843dfc70645SNeilBrown * is not possible. 1844dfc70645SNeilBrown */ 1845dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 18465389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1847dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1848dfc70645SNeilBrown err = -EBUSY; 1849dfc70645SNeilBrown goto abort; 1850dfc70645SNeilBrown } 18511da177e4SLinus Torvalds p->rdev = NULL; 1852d787be40SNeilBrown if (!test_bit(RemoveSynchronized, &rdev->flags)) { 1853fbd568a3SPaul E. McKenney synchronize_rcu(); 18541da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 18551da177e4SLinus Torvalds /* lost the race, try later */ 18561da177e4SLinus Torvalds err = -EBUSY; 18571da177e4SLinus Torvalds p->rdev = rdev; 1858ac5e7113SAndre Noll goto abort; 1859d787be40SNeilBrown } 1860d787be40SNeilBrown } 1861d787be40SNeilBrown if (conf->mirrors[conf->raid_disks + number].rdev) { 18628c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 18638c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 18648c7a2c2bSNeilBrown * doing this to avoid confusion. 18658c7a2c2bSNeilBrown */ 18668c7a2c2bSNeilBrown struct md_rdev *repl = 18678c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 1868e2d59925SNeilBrown freeze_array(conf, 0); 18693de59bb9SYufen Yu if (atomic_read(&repl->nr_pending)) { 18703de59bb9SYufen Yu /* It means that some queued IO of retry_list 18713de59bb9SYufen Yu * hold repl. Thus, we cannot set replacement 18723de59bb9SYufen Yu * as NULL, avoiding rdev NULL pointer 18733de59bb9SYufen Yu * dereference in sync_request_write and 18743de59bb9SYufen Yu * handle_write_finished. 18753de59bb9SYufen Yu */ 18763de59bb9SYufen Yu err = -EBUSY; 18773de59bb9SYufen Yu unfreeze_array(conf); 18783de59bb9SYufen Yu goto abort; 18793de59bb9SYufen Yu } 18808c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 18818c7a2c2bSNeilBrown p->rdev = repl; 18828c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 1883e2d59925SNeilBrown unfreeze_array(conf); 1884e5bc9c3cSGuoqing Jiang } 1885e5bc9c3cSGuoqing Jiang 18868c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1887a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 18881da177e4SLinus Torvalds } 18891da177e4SLinus Torvalds abort: 18901da177e4SLinus Torvalds 18911da177e4SLinus Torvalds print_conf(conf); 18921da177e4SLinus Torvalds return err; 18931da177e4SLinus Torvalds } 18941da177e4SLinus Torvalds 18954246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio) 18961da177e4SLinus Torvalds { 189798d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 18981da177e4SLinus Torvalds 18990fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1900ba3ae3beSNamhyung Kim 19011da177e4SLinus Torvalds /* 19021da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 19031da177e4SLinus Torvalds * or re-read if the read failed. 19041da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 19051da177e4SLinus Torvalds */ 19064e4cbee9SChristoph Hellwig if (!bio->bi_status) 19071da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1908d11c171eSNeilBrown 1909d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 19101da177e4SLinus Torvalds reschedule_retry(r1_bio); 19111da177e4SLinus Torvalds } 19121da177e4SLinus Torvalds 1913dfcc34c9SNate Dailey static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio) 1914dfcc34c9SNate Dailey { 1915dfcc34c9SNate Dailey sector_t sync_blocks = 0; 1916dfcc34c9SNate Dailey sector_t s = r1_bio->sector; 1917dfcc34c9SNate Dailey long sectors_to_go = r1_bio->sectors; 1918dfcc34c9SNate Dailey 1919dfcc34c9SNate Dailey /* make sure these bits don't get cleared. */ 1920dfcc34c9SNate Dailey do { 1921dfcc34c9SNate Dailey md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); 1922dfcc34c9SNate Dailey s += sync_blocks; 1923dfcc34c9SNate Dailey sectors_to_go -= sync_blocks; 1924dfcc34c9SNate Dailey } while (sectors_to_go > 0); 1925dfcc34c9SNate Dailey } 1926dfcc34c9SNate Dailey 1927449808a2SHou Tao static void put_sync_write_buf(struct r1bio *r1_bio, int uptodate) 1928449808a2SHou Tao { 1929449808a2SHou Tao if (atomic_dec_and_test(&r1_bio->remaining)) { 1930449808a2SHou Tao struct mddev *mddev = r1_bio->mddev; 1931449808a2SHou Tao int s = r1_bio->sectors; 1932449808a2SHou Tao 1933449808a2SHou Tao if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1934449808a2SHou Tao test_bit(R1BIO_WriteError, &r1_bio->state)) 1935449808a2SHou Tao reschedule_retry(r1_bio); 1936449808a2SHou Tao else { 1937449808a2SHou Tao put_buf(r1_bio); 1938449808a2SHou Tao md_done_sync(mddev, s, uptodate); 1939449808a2SHou Tao } 1940449808a2SHou Tao } 1941449808a2SHou Tao } 1942449808a2SHou Tao 19434246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio) 19441da177e4SLinus Torvalds { 19454e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status; 194698d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 1947fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1948e8096360SNeilBrown struct r1conf *conf = mddev->private; 19494367af55SNeilBrown sector_t first_bad; 19504367af55SNeilBrown int bad_sectors; 1951854abd75SNeilBrown struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; 1952ba3ae3beSNamhyung Kim 19536b1117d5SNeilBrown if (!uptodate) { 1954dfcc34c9SNate Dailey abort_sync_write(mddev, r1_bio); 1955854abd75SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1956854abd75SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 195719d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 195819d67169SNeilBrown mddev->recovery); 1959d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 1960854abd75SNeilBrown } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 19613a9f28a5SNeilBrown &first_bad, &bad_sectors) && 19623a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 19633a9f28a5SNeilBrown r1_bio->sector, 19643a9f28a5SNeilBrown r1_bio->sectors, 19653a9f28a5SNeilBrown &first_bad, &bad_sectors) 19663a9f28a5SNeilBrown ) 19674367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1968e3b9703eSNeilBrown 1969449808a2SHou Tao put_sync_write_buf(r1_bio, uptodate); 19704367af55SNeilBrown } 19711da177e4SLinus Torvalds 19723cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1973d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1974d8f05d29SNeilBrown { 19754ce4c73fSBart Van Assche if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) 1976d8f05d29SNeilBrown /* success */ 1977d8f05d29SNeilBrown return 1; 197819d67169SNeilBrown if (rw == WRITE) { 1979d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 198019d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 198119d67169SNeilBrown &rdev->flags)) 198219d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 198319d67169SNeilBrown rdev->mddev->recovery); 198419d67169SNeilBrown } 1985d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 1986d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 1987d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 1988d8f05d29SNeilBrown return 0; 1989d8f05d29SNeilBrown } 1990d8f05d29SNeilBrown 19919f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 19921da177e4SLinus Torvalds { 1993a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 199469382e85SNeilBrown * good data, much like with normal read errors. Only 1995ddac7c7eSNeilBrown * read into the pages we already have so we don't 199669382e85SNeilBrown * need to re-issue the read request. 199769382e85SNeilBrown * We don't need to freeze the array, because being in an 199869382e85SNeilBrown * active sync request, there is no normal IO, and 199969382e85SNeilBrown * no overlapping syncs. 200006f60385SNeilBrown * We don't need to check is_badblock() again as we 200106f60385SNeilBrown * made sure that anything with a bad block in range 200206f60385SNeilBrown * will have bi_end_io clear. 20031da177e4SLinus Torvalds */ 2004fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2005e8096360SNeilBrown struct r1conf *conf = mddev->private; 2006a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 200744cf0f4dSMing Lei struct page **pages = get_resync_pages(bio)->pages; 200869382e85SNeilBrown sector_t sect = r1_bio->sector; 200969382e85SNeilBrown int sectors = r1_bio->sectors; 201069382e85SNeilBrown int idx = 0; 20112e52d449SNeilBrown struct md_rdev *rdev; 20122e52d449SNeilBrown 20132e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 20142e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) { 20152e52d449SNeilBrown /* Don't try recovering from here - just fail it 20162e52d449SNeilBrown * ... unless it is the last working device of course */ 20172e52d449SNeilBrown md_error(mddev, rdev); 20182e52d449SNeilBrown if (test_bit(Faulty, &rdev->flags)) 20192e52d449SNeilBrown /* Don't try to read from here, but make sure 20202e52d449SNeilBrown * put_buf does it's thing 20212e52d449SNeilBrown */ 20222e52d449SNeilBrown bio->bi_end_io = end_sync_write; 20232e52d449SNeilBrown } 202469382e85SNeilBrown 202569382e85SNeilBrown while(sectors) { 202669382e85SNeilBrown int s = sectors; 202769382e85SNeilBrown int d = r1_bio->read_disk; 202869382e85SNeilBrown int success = 0; 202978d7f5f7SNeilBrown int start; 203069382e85SNeilBrown 203169382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 203269382e85SNeilBrown s = PAGE_SIZE >> 9; 203369382e85SNeilBrown do { 203469382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 2035ddac7c7eSNeilBrown /* No rcu protection needed here devices 2036ddac7c7eSNeilBrown * can only be removed when no resync is 2037ddac7c7eSNeilBrown * active, and resync is currently active 2038ddac7c7eSNeilBrown */ 203969382e85SNeilBrown rdev = conf->mirrors[d].rdev; 20409d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 204144cf0f4dSMing Lei pages[idx], 20424ce4c73fSBart Van Assche REQ_OP_READ, false)) { 204369382e85SNeilBrown success = 1; 204469382e85SNeilBrown break; 204569382e85SNeilBrown } 204669382e85SNeilBrown } 204769382e85SNeilBrown d++; 20488f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 204969382e85SNeilBrown d = 0; 205069382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 205169382e85SNeilBrown 205278d7f5f7SNeilBrown if (!success) { 20533a9f28a5SNeilBrown int abort = 0; 20543a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 20553a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 20563a9f28a5SNeilBrown * work just disable and interrupt the recovery. 20573a9f28a5SNeilBrown * Don't fail devices as that won't really help. 20583a9f28a5SNeilBrown */ 2059ac483eb3SChristoph Hellwig pr_crit_ratelimited("md/raid1:%s: %pg: unrecoverable I/O read error for block %llu\n", 2060ac483eb3SChristoph Hellwig mdname(mddev), bio->bi_bdev, 206178d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 20628f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 20633a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 20643a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 20653a9f28a5SNeilBrown continue; 20663a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 20673a9f28a5SNeilBrown abort = 1; 20683a9f28a5SNeilBrown } 20693a9f28a5SNeilBrown if (abort) { 2070d890fa2bSNeilBrown conf->recovery_disabled = 2071d890fa2bSNeilBrown mddev->recovery_disabled; 20723a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 207378d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 207478d7f5f7SNeilBrown put_buf(r1_bio); 207578d7f5f7SNeilBrown return 0; 207678d7f5f7SNeilBrown } 20773a9f28a5SNeilBrown /* Try next page */ 20783a9f28a5SNeilBrown sectors -= s; 20793a9f28a5SNeilBrown sect += s; 20803a9f28a5SNeilBrown idx++; 20813a9f28a5SNeilBrown continue; 20823a9f28a5SNeilBrown } 208378d7f5f7SNeilBrown 208478d7f5f7SNeilBrown start = d; 208569382e85SNeilBrown /* write it back and re-read */ 208669382e85SNeilBrown while (d != r1_bio->read_disk) { 208769382e85SNeilBrown if (d == 0) 20888f19ccb2SNeilBrown d = conf->raid_disks * 2; 208969382e85SNeilBrown d--; 209069382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 209169382e85SNeilBrown continue; 209269382e85SNeilBrown rdev = conf->mirrors[d].rdev; 2093d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 209444cf0f4dSMing Lei pages[idx], 2095d8f05d29SNeilBrown WRITE) == 0) { 209678d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 209778d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 20989d3d8011SNamhyung Kim } 2099097426f6SNeilBrown } 2100097426f6SNeilBrown d = start; 2101097426f6SNeilBrown while (d != r1_bio->read_disk) { 2102097426f6SNeilBrown if (d == 0) 21038f19ccb2SNeilBrown d = conf->raid_disks * 2; 2104097426f6SNeilBrown d--; 2105097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 2106097426f6SNeilBrown continue; 2107097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 2108d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 210944cf0f4dSMing Lei pages[idx], 2110d8f05d29SNeilBrown READ) != 0) 21119d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 211269382e85SNeilBrown } 211369382e85SNeilBrown sectors -= s; 211469382e85SNeilBrown sect += s; 211569382e85SNeilBrown idx ++; 211669382e85SNeilBrown } 211778d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 21184e4cbee9SChristoph Hellwig bio->bi_status = 0; 2119a68e5870SNeilBrown return 1; 212069382e85SNeilBrown } 2121d11c171eSNeilBrown 2122c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio) 2123a68e5870SNeilBrown { 2124a68e5870SNeilBrown /* We have read all readable devices. If we haven't 2125a68e5870SNeilBrown * got the block, then there is no hope left. 2126a68e5870SNeilBrown * If we have, then we want to do a comparison 2127a68e5870SNeilBrown * and skip the write if everything is the same. 2128a68e5870SNeilBrown * If any blocks failed to read, then we need to 2129a68e5870SNeilBrown * attempt an over-write 2130a68e5870SNeilBrown */ 2131fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2132e8096360SNeilBrown struct r1conf *conf = mddev->private; 2133a68e5870SNeilBrown int primary; 2134a68e5870SNeilBrown int i; 2135f4380a91Smajianpeng int vcnt; 2136a68e5870SNeilBrown 213730bc9b53SNeilBrown /* Fix variable parts of all bios */ 213830bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 213930bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 21404e4cbee9SChristoph Hellwig blk_status_t status; 214130bc9b53SNeilBrown struct bio *b = r1_bio->bios[i]; 214298d30c58SMing Lei struct resync_pages *rp = get_resync_pages(b); 214330bc9b53SNeilBrown if (b->bi_end_io != end_sync_read) 214430bc9b53SNeilBrown continue; 21454246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */ 21464e4cbee9SChristoph Hellwig status = b->bi_status; 2147a7c50c94SChristoph Hellwig bio_reset(b, conf->mirrors[i].rdev->bdev, REQ_OP_READ); 21484e4cbee9SChristoph Hellwig b->bi_status = status; 21494f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector + 215030bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset; 215130bc9b53SNeilBrown b->bi_end_io = end_sync_read; 215298d30c58SMing Lei rp->raid_bio = r1_bio; 215398d30c58SMing Lei b->bi_private = rp; 215430bc9b53SNeilBrown 2155fb0eb5dfSMing Lei /* initialize bvec table again */ 2156fb0eb5dfSMing Lei md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); 215730bc9b53SNeilBrown } 21588f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 2159a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 21604e4cbee9SChristoph Hellwig !r1_bio->bios[primary]->bi_status) { 2161a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 2162a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 2163a68e5870SNeilBrown break; 2164a68e5870SNeilBrown } 2165a68e5870SNeilBrown r1_bio->read_disk = primary; 21668f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 21672b070cfeSChristoph Hellwig int j = 0; 2168a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 2169a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 21704e4cbee9SChristoph Hellwig blk_status_t status = sbio->bi_status; 217144cf0f4dSMing Lei struct page **ppages = get_resync_pages(pbio)->pages; 217244cf0f4dSMing Lei struct page **spages = get_resync_pages(sbio)->pages; 217360928a91SMing Lei struct bio_vec *bi; 21748fc04e6eSMing Lei int page_len[RESYNC_PAGES] = { 0 }; 21756dc4f100SMing Lei struct bvec_iter_all iter_all; 217678d7f5f7SNeilBrown 21772aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read) 217878d7f5f7SNeilBrown continue; 21794246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */ 21804e4cbee9SChristoph Hellwig sbio->bi_status = 0; 2181a68e5870SNeilBrown 21822b070cfeSChristoph Hellwig bio_for_each_segment_all(bi, sbio, iter_all) 21832b070cfeSChristoph Hellwig page_len[j++] = bi->bv_len; 218460928a91SMing Lei 21854e4cbee9SChristoph Hellwig if (!status) { 2186a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 218744cf0f4dSMing Lei if (memcmp(page_address(ppages[j]), 218844cf0f4dSMing Lei page_address(spages[j]), 218960928a91SMing Lei page_len[j])) 2190a68e5870SNeilBrown break; 2191a68e5870SNeilBrown } 2192a68e5870SNeilBrown } else 2193a68e5870SNeilBrown j = 0; 2194a68e5870SNeilBrown if (j >= 0) 21957f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); 2196a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 21974e4cbee9SChristoph Hellwig && !status)) { 219878d7f5f7SNeilBrown /* No need to write to this device. */ 2199a68e5870SNeilBrown sbio->bi_end_io = NULL; 2200a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 220178d7f5f7SNeilBrown continue; 220278d7f5f7SNeilBrown } 2203d3b45c2aSKent Overstreet 2204d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio); 2205a68e5870SNeilBrown } 2206a68e5870SNeilBrown } 2207a68e5870SNeilBrown 22089f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 2209a68e5870SNeilBrown { 2210e8096360SNeilBrown struct r1conf *conf = mddev->private; 2211a68e5870SNeilBrown int i; 22128f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 2213037d2ff6SGuoqing Jiang struct bio *wbio; 2214a68e5870SNeilBrown 2215a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2216a68e5870SNeilBrown /* ouch - failed to read all of that. */ 2217a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 2218a68e5870SNeilBrown return; 22197ca78d57SNeilBrown 22207ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2221c95e6385SNeilBrown process_checks(r1_bio); 2222c95e6385SNeilBrown 2223d11c171eSNeilBrown /* 2224d11c171eSNeilBrown * schedule writes 2225d11c171eSNeilBrown */ 22261da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 22271da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 22281da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 22293e198f78SNeilBrown if (wbio->bi_end_io == NULL || 22303e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 22313e198f78SNeilBrown (i == r1_bio->read_disk || 22323e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 22331da177e4SLinus Torvalds continue; 2234dfcc34c9SNate Dailey if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) { 2235dfcc34c9SNate Dailey abort_sync_write(mddev, r1_bio); 22360c9d5b12SNeilBrown continue; 2237dfcc34c9SNate Dailey } 22381da177e4SLinus Torvalds 2239c34b7ac6SChristoph Hellwig wbio->bi_opf = REQ_OP_WRITE; 2240212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) 2241212e7eb7SNeilBrown wbio->bi_opf |= MD_FAILFAST; 2242212e7eb7SNeilBrown 22433e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 22441da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 2245aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); 2246191ea9b2SNeilBrown 2247ed00aabdSChristoph Hellwig submit_bio_noacct(wbio); 22481da177e4SLinus Torvalds } 22491da177e4SLinus Torvalds 2250449808a2SHou Tao put_sync_write_buf(r1_bio, 1); 22511da177e4SLinus Torvalds } 22521da177e4SLinus Torvalds 22531da177e4SLinus Torvalds /* 22541da177e4SLinus Torvalds * This is a kernel thread which: 22551da177e4SLinus Torvalds * 22561da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 22571da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 2258d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 22591da177e4SLinus Torvalds */ 22601da177e4SLinus Torvalds 2261e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 2262867868fbSNeilBrown sector_t sect, int sectors) 2263867868fbSNeilBrown { 2264fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 2265867868fbSNeilBrown while(sectors) { 2266867868fbSNeilBrown int s = sectors; 2267867868fbSNeilBrown int d = read_disk; 2268867868fbSNeilBrown int success = 0; 2269867868fbSNeilBrown int start; 22703cb03002SNeilBrown struct md_rdev *rdev; 2271867868fbSNeilBrown 2272867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 2273867868fbSNeilBrown s = PAGE_SIZE >> 9; 2274867868fbSNeilBrown 2275867868fbSNeilBrown do { 2276d2eb35acSNeilBrown sector_t first_bad; 2277d2eb35acSNeilBrown int bad_sectors; 2278d2eb35acSNeilBrown 2279707a6a42SNeilBrown rcu_read_lock(); 2280707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2281867868fbSNeilBrown if (rdev && 2282da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 2283da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 2284da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 2285d2eb35acSNeilBrown is_badblock(rdev, sect, s, 2286707a6a42SNeilBrown &first_bad, &bad_sectors) == 0) { 2287707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2288707a6a42SNeilBrown rcu_read_unlock(); 2289707a6a42SNeilBrown if (sync_page_io(rdev, sect, s<<9, 22904ce4c73fSBart Van Assche conf->tmppage, REQ_OP_READ, false)) 2291867868fbSNeilBrown success = 1; 2292707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2293707a6a42SNeilBrown if (success) 2294707a6a42SNeilBrown break; 2295707a6a42SNeilBrown } else 2296707a6a42SNeilBrown rcu_read_unlock(); 2297867868fbSNeilBrown d++; 22988f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 2299867868fbSNeilBrown d = 0; 2300867868fbSNeilBrown } while (!success && d != read_disk); 2301867868fbSNeilBrown 2302867868fbSNeilBrown if (!success) { 2303d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 23043cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 2305d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 2306d8f05d29SNeilBrown md_error(mddev, rdev); 2307867868fbSNeilBrown break; 2308867868fbSNeilBrown } 2309867868fbSNeilBrown /* write it back and re-read */ 2310867868fbSNeilBrown start = d; 2311867868fbSNeilBrown while (d != read_disk) { 2312867868fbSNeilBrown if (d==0) 23138f19ccb2SNeilBrown d = conf->raid_disks * 2; 2314867868fbSNeilBrown d--; 2315707a6a42SNeilBrown rcu_read_lock(); 2316707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2317867868fbSNeilBrown if (rdev && 2318707a6a42SNeilBrown !test_bit(Faulty, &rdev->flags)) { 2319707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2320707a6a42SNeilBrown rcu_read_unlock(); 2321d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 2322d8f05d29SNeilBrown conf->tmppage, WRITE); 2323707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2324707a6a42SNeilBrown } else 2325707a6a42SNeilBrown rcu_read_unlock(); 2326867868fbSNeilBrown } 2327867868fbSNeilBrown d = start; 2328867868fbSNeilBrown while (d != read_disk) { 2329867868fbSNeilBrown if (d==0) 23308f19ccb2SNeilBrown d = conf->raid_disks * 2; 2331867868fbSNeilBrown d--; 2332707a6a42SNeilBrown rcu_read_lock(); 2333707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2334867868fbSNeilBrown if (rdev && 2335b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) { 2336707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2337707a6a42SNeilBrown rcu_read_unlock(); 2338d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 2339d8f05d29SNeilBrown conf->tmppage, READ)) { 2340867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 2341913cce5aSChristoph Hellwig pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %pg)\n", 2342867868fbSNeilBrown mdname(mddev), s, 2343969b755aSRandy Dunlap (unsigned long long)(sect + 2344969b755aSRandy Dunlap rdev->data_offset), 2345913cce5aSChristoph Hellwig rdev->bdev); 2346867868fbSNeilBrown } 2347707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2348707a6a42SNeilBrown } else 2349707a6a42SNeilBrown rcu_read_unlock(); 2350867868fbSNeilBrown } 2351867868fbSNeilBrown sectors -= s; 2352867868fbSNeilBrown sect += s; 2353867868fbSNeilBrown } 2354867868fbSNeilBrown } 2355867868fbSNeilBrown 23569f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2357cd5ff9a1SNeilBrown { 2358fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2359e8096360SNeilBrown struct r1conf *conf = mddev->private; 23603cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2361cd5ff9a1SNeilBrown 2362cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2363cd5ff9a1SNeilBrown * we just recently had a write error. 2364cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2365cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2366cd5ff9a1SNeilBrown * a bad block. 2367cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2368cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2369cd5ff9a1SNeilBrown * 2370cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2371cd5ff9a1SNeilBrown */ 2372cd5ff9a1SNeilBrown 2373cd5ff9a1SNeilBrown int block_sectors; 2374cd5ff9a1SNeilBrown sector_t sector; 2375cd5ff9a1SNeilBrown int sectors; 2376cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2377cd5ff9a1SNeilBrown int ok = 1; 2378cd5ff9a1SNeilBrown 2379cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2380cd5ff9a1SNeilBrown return 0; 2381cd5ff9a1SNeilBrown 2382ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift, 2383ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9); 2384cd5ff9a1SNeilBrown sector = r1_bio->sector; 2385cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2386cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2387cd5ff9a1SNeilBrown - sector; 2388cd5ff9a1SNeilBrown 2389cd5ff9a1SNeilBrown while (sect_to_write) { 2390cd5ff9a1SNeilBrown struct bio *wbio; 2391cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2392cd5ff9a1SNeilBrown sectors = sect_to_write; 2393cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2394cd5ff9a1SNeilBrown 2395b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2396abfc426dSChristoph Hellwig wbio = bio_alloc_clone(rdev->bdev, 2397abfc426dSChristoph Hellwig r1_bio->behind_master_bio, 2398abfc426dSChristoph Hellwig GFP_NOIO, &mddev->bio_set); 2399b783863fSKent Overstreet } else { 2400abfc426dSChristoph Hellwig wbio = bio_alloc_clone(rdev->bdev, r1_bio->master_bio, 2401abfc426dSChristoph Hellwig GFP_NOIO, &mddev->bio_set); 2402b783863fSKent Overstreet } 2403b783863fSKent Overstreet 2404c34b7ac6SChristoph Hellwig wbio->bi_opf = REQ_OP_WRITE; 24054f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector; 24064f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9; 2407cd5ff9a1SNeilBrown 24086678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors); 24094f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset; 24104e49ea4aSMike Christie 24114e49ea4aSMike Christie if (submit_bio_wait(wbio) < 0) 2412cd5ff9a1SNeilBrown /* failure! */ 2413cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2414cd5ff9a1SNeilBrown sectors, 0) 2415cd5ff9a1SNeilBrown && ok; 2416cd5ff9a1SNeilBrown 2417cd5ff9a1SNeilBrown bio_put(wbio); 2418cd5ff9a1SNeilBrown sect_to_write -= sectors; 2419cd5ff9a1SNeilBrown sector += sectors; 2420cd5ff9a1SNeilBrown sectors = block_sectors; 2421cd5ff9a1SNeilBrown } 2422cd5ff9a1SNeilBrown return ok; 2423cd5ff9a1SNeilBrown } 2424cd5ff9a1SNeilBrown 2425e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 242662096bceSNeilBrown { 242762096bceSNeilBrown int m; 242862096bceSNeilBrown int s = r1_bio->sectors; 24298f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 24303cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 243162096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 243262096bceSNeilBrown if (bio->bi_end_io == NULL) 243362096bceSNeilBrown continue; 24344e4cbee9SChristoph Hellwig if (!bio->bi_status && 243562096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2436c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 243762096bceSNeilBrown } 24384e4cbee9SChristoph Hellwig if (bio->bi_status && 243962096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 244062096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 244162096bceSNeilBrown md_error(conf->mddev, rdev); 244262096bceSNeilBrown } 244362096bceSNeilBrown } 244462096bceSNeilBrown put_buf(r1_bio); 244562096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 244662096bceSNeilBrown } 244762096bceSNeilBrown 2448e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 244962096bceSNeilBrown { 2450fd76863eScolyli@suse.de int m, idx; 245155ce74d4SNeilBrown bool fail = false; 2452fd76863eScolyli@suse.de 24538f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 245462096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 24553cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 245662096bceSNeilBrown rdev_clear_badblocks(rdev, 245762096bceSNeilBrown r1_bio->sector, 2458c6563a8cSNeilBrown r1_bio->sectors, 0); 245962096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 246062096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 246162096bceSNeilBrown /* This drive got a write error. We need to 246262096bceSNeilBrown * narrow down and record precise write 246362096bceSNeilBrown * errors. 246462096bceSNeilBrown */ 246555ce74d4SNeilBrown fail = true; 246662096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 246762096bceSNeilBrown md_error(conf->mddev, 246862096bceSNeilBrown conf->mirrors[m].rdev); 246962096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 247062096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 247162096bceSNeilBrown } 247262096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 247362096bceSNeilBrown conf->mddev); 247462096bceSNeilBrown } 247555ce74d4SNeilBrown if (fail) { 247655ce74d4SNeilBrown spin_lock_irq(&conf->device_lock); 247755ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list); 2478fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2479824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 248055ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock); 2481824e47daScolyli@suse.de /* 2482824e47daScolyli@suse.de * In case freeze_array() is waiting for condition 2483824e47daScolyli@suse.de * get_unqueued_pending() == extra to be true. 2484824e47daScolyli@suse.de */ 2485824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 248655ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread); 2487bd8688a1SNeilBrown } else { 2488bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2489bd8688a1SNeilBrown close_write(r1_bio); 249062096bceSNeilBrown raid_end_bio_io(r1_bio); 249162096bceSNeilBrown } 2492bd8688a1SNeilBrown } 249362096bceSNeilBrown 2494e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 249562096bceSNeilBrown { 2496fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 249762096bceSNeilBrown struct bio *bio; 24983cb03002SNeilBrown struct md_rdev *rdev; 249962096bceSNeilBrown 250062096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 250162096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 250262096bceSNeilBrown * the block and we can fix it. 250362096bceSNeilBrown * We freeze all other IO, and try reading the block from 250462096bceSNeilBrown * other devices. When we find one, we re-write 250562096bceSNeilBrown * and check it that fixes the read error. 250662096bceSNeilBrown * This is all done synchronously while the array is 250762096bceSNeilBrown * frozen 250862096bceSNeilBrown */ 25097449f699STomasz Majchrzak 25107449f699STomasz Majchrzak bio = r1_bio->bios[r1_bio->read_disk]; 25117449f699STomasz Majchrzak bio_put(bio); 25127449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = NULL; 25137449f699STomasz Majchrzak 25142e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 25152e52d449SNeilBrown if (mddev->ro == 0 25162e52d449SNeilBrown && !test_bit(FailFast, &rdev->flags)) { 2517e2d59925SNeilBrown freeze_array(conf, 1); 251862096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 251962096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 252062096bceSNeilBrown unfreeze_array(conf); 2521b33d1062SGioh Kim } else if (mddev->ro == 0 && test_bit(FailFast, &rdev->flags)) { 2522b33d1062SGioh Kim md_error(mddev, rdev); 25237449f699STomasz Majchrzak } else { 25247449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; 25257449f699STomasz Majchrzak } 25267449f699STomasz Majchrzak 25272e52d449SNeilBrown rdev_dec_pending(rdev, conf->mddev); 2528689389a0SNeilBrown allow_barrier(conf, r1_bio->sector); 2529689389a0SNeilBrown bio = r1_bio->master_bio; 253062096bceSNeilBrown 2531689389a0SNeilBrown /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ 2532689389a0SNeilBrown r1_bio->state = 0; 2533689389a0SNeilBrown raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); 2534109e3765SNeilBrown } 253562096bceSNeilBrown 25364ed8731dSShaohua Li static void raid1d(struct md_thread *thread) 25371da177e4SLinus Torvalds { 25384ed8731dSShaohua Li struct mddev *mddev = thread->mddev; 25399f2c9d12SNeilBrown struct r1bio *r1_bio; 25401da177e4SLinus Torvalds unsigned long flags; 2541e8096360SNeilBrown struct r1conf *conf = mddev->private; 25421da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2543e1dfa0a2SNeilBrown struct blk_plug plug; 2544fd76863eScolyli@suse.de int idx; 25451da177e4SLinus Torvalds 25461da177e4SLinus Torvalds md_check_recovery(mddev); 25471da177e4SLinus Torvalds 254855ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) && 25492953079cSShaohua Li !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { 255055ce74d4SNeilBrown LIST_HEAD(tmp); 255155ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 2552fd76863eScolyli@suse.de if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 2553fd76863eScolyli@suse.de list_splice_init(&conf->bio_end_io_list, &tmp); 255455ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 255555ce74d4SNeilBrown while (!list_empty(&tmp)) { 2556a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio, 2557a452744bSMikulas Patocka retry_list); 255855ce74d4SNeilBrown list_del(&r1_bio->retry_list); 2559fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2560824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 2561bd8688a1SNeilBrown if (mddev->degraded) 2562bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 2563bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2564bd8688a1SNeilBrown close_write(r1_bio); 256555ce74d4SNeilBrown raid_end_bio_io(r1_bio); 256655ce74d4SNeilBrown } 256755ce74d4SNeilBrown } 256855ce74d4SNeilBrown 2569e1dfa0a2SNeilBrown blk_start_plug(&plug); 25701da177e4SLinus Torvalds for (;;) { 2571a35e63efSNeilBrown 25727eaceaccSJens Axboe flush_pending_writes(conf); 2573a35e63efSNeilBrown 25741da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2575a35e63efSNeilBrown if (list_empty(head)) { 2576191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 25771da177e4SLinus Torvalds break; 2578a35e63efSNeilBrown } 25799f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 25801da177e4SLinus Torvalds list_del(head->prev); 2581fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2582824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 25831da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 25841da177e4SLinus Torvalds 25851da177e4SLinus Torvalds mddev = r1_bio->mddev; 2586070ec55dSNeilBrown conf = mddev->private; 25874367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2588d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 258962096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 259062096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 259162096bceSNeilBrown else 25921da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2593cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 259462096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 259562096bceSNeilBrown handle_write_finished(conf, r1_bio); 259662096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 259762096bceSNeilBrown handle_read_error(conf, r1_bio); 2598d2eb35acSNeilBrown else 2599c230e7e5SNeilBrown WARN_ON_ONCE(1); 260062096bceSNeilBrown 26011d9d5241SNeilBrown cond_resched(); 26022953079cSShaohua Li if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) 2603de393cdeSNeilBrown md_check_recovery(mddev); 26041da177e4SLinus Torvalds } 2605e1dfa0a2SNeilBrown blk_finish_plug(&plug); 26061da177e4SLinus Torvalds } 26071da177e4SLinus Torvalds 2608e8096360SNeilBrown static int init_resync(struct r1conf *conf) 26091da177e4SLinus Torvalds { 26101da177e4SLinus Torvalds int buffs; 26111da177e4SLinus Torvalds 26121da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 2613afeee514SKent Overstreet BUG_ON(mempool_initialized(&conf->r1buf_pool)); 2614afeee514SKent Overstreet 2615afeee514SKent Overstreet return mempool_init(&conf->r1buf_pool, buffs, r1buf_pool_alloc, 2616afeee514SKent Overstreet r1buf_pool_free, conf->poolinfo); 26171da177e4SLinus Torvalds } 26181da177e4SLinus Torvalds 2619208410b5SShaohua Li static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) 2620208410b5SShaohua Li { 2621afeee514SKent Overstreet struct r1bio *r1bio = mempool_alloc(&conf->r1buf_pool, GFP_NOIO); 2622208410b5SShaohua Li struct resync_pages *rps; 2623208410b5SShaohua Li struct bio *bio; 2624208410b5SShaohua Li int i; 2625208410b5SShaohua Li 2626208410b5SShaohua Li for (i = conf->poolinfo->raid_disks; i--; ) { 2627208410b5SShaohua Li bio = r1bio->bios[i]; 2628208410b5SShaohua Li rps = bio->bi_private; 2629a7c50c94SChristoph Hellwig bio_reset(bio, NULL, 0); 2630208410b5SShaohua Li bio->bi_private = rps; 2631208410b5SShaohua Li } 2632208410b5SShaohua Li r1bio->master_bio = NULL; 2633208410b5SShaohua Li return r1bio; 2634208410b5SShaohua Li } 2635208410b5SShaohua Li 26361da177e4SLinus Torvalds /* 26371da177e4SLinus Torvalds * perform a "sync" on one "block" 26381da177e4SLinus Torvalds * 26391da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 26401da177e4SLinus Torvalds * requests - conflict with active sync requests. 26411da177e4SLinus Torvalds * 26421da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 26431da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 26441da177e4SLinus Torvalds */ 26451da177e4SLinus Torvalds 2646849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 2647849674e4SShaohua Li int *skipped) 26481da177e4SLinus Torvalds { 2649e8096360SNeilBrown struct r1conf *conf = mddev->private; 26509f2c9d12SNeilBrown struct r1bio *r1_bio; 26511da177e4SLinus Torvalds struct bio *bio; 26521da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 26533e198f78SNeilBrown int disk = -1; 26541da177e4SLinus Torvalds int i; 26553e198f78SNeilBrown int wonly = -1; 26563e198f78SNeilBrown int write_targets = 0, read_targets = 0; 265757dab0bdSNeilBrown sector_t sync_blocks; 2658e3b9703eSNeilBrown int still_degraded = 0; 265906f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 266006f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 2661fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 2662022e510fSMing Lei int page_idx = 0; 26631da177e4SLinus Torvalds 2664afeee514SKent Overstreet if (!mempool_initialized(&conf->r1buf_pool)) 26651da177e4SLinus Torvalds if (init_resync(conf)) 266657afd89fSNeilBrown return 0; 26671da177e4SLinus Torvalds 266858c0fed4SAndre Noll max_sector = mddev->dev_sectors; 26691da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2670191ea9b2SNeilBrown /* If we aborted, we need to abort the 2671191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2672191ea9b2SNeilBrown * only be one in raid1 resync. 2673191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2674191ea9b2SNeilBrown */ 26756a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 2676e64e4018SAndy Shevchenko md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2677191ea9b2SNeilBrown &sync_blocks, 1); 26786a806c51SNeilBrown else /* completed sync */ 2679191ea9b2SNeilBrown conf->fullsync = 0; 26806a806c51SNeilBrown 2681e64e4018SAndy Shevchenko md_bitmap_close_sync(mddev->bitmap); 26821da177e4SLinus Torvalds close_sync(conf); 2683c40f341fSGoldwyn Rodrigues 2684c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) { 2685c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0; 2686c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0; 2687c40f341fSGoldwyn Rodrigues } 26881da177e4SLinus Torvalds return 0; 26891da177e4SLinus Torvalds } 26901da177e4SLinus Torvalds 269107d84d10SNeilBrown if (mddev->bitmap == NULL && 269207d84d10SNeilBrown mddev->recovery_cp == MaxSector && 26936394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 269407d84d10SNeilBrown conf->fullsync == 0) { 269507d84d10SNeilBrown *skipped = 1; 269607d84d10SNeilBrown return max_sector - sector_nr; 269707d84d10SNeilBrown } 26986394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 26996394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 27006394cca5SNeilBrown */ 2701e64e4018SAndy Shevchenko if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2702e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2703191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2704191ea9b2SNeilBrown *skipped = 1; 2705191ea9b2SNeilBrown return sync_blocks; 2706191ea9b2SNeilBrown } 270717999be4SNeilBrown 27087ac50447STomasz Majchrzak /* 27097ac50447STomasz Majchrzak * If there is non-resync activity waiting for a turn, then let it 27107ac50447STomasz Majchrzak * though before starting on this new sync request. 27117ac50447STomasz Majchrzak */ 2712824e47daScolyli@suse.de if (atomic_read(&conf->nr_waiting[idx])) 27137ac50447STomasz Majchrzak schedule_timeout_uninterruptible(1); 27147ac50447STomasz Majchrzak 2715c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against 2716c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS 2717c40f341fSGoldwyn Rodrigues */ 2718c40f341fSGoldwyn Rodrigues 2719e64e4018SAndy Shevchenko md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, 2720c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); 272117999be4SNeilBrown 27228c242593SYufen Yu 27238c242593SYufen Yu if (raise_barrier(conf, sector_nr)) 27248c242593SYufen Yu return 0; 27258c242593SYufen Yu 27268c242593SYufen Yu r1_bio = raid1_alloc_init_r1buf(conf); 27271da177e4SLinus Torvalds 27283e198f78SNeilBrown rcu_read_lock(); 27293e198f78SNeilBrown /* 27303e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 27313e198f78SNeilBrown * we might want to read from a different device. So we 27323e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 27333e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 27343e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 27353e198f78SNeilBrown * is OK. 27363e198f78SNeilBrown */ 27371da177e4SLinus Torvalds 27381da177e4SLinus Torvalds r1_bio->mddev = mddev; 27391da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2740191ea9b2SNeilBrown r1_bio->state = 0; 27411da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 2742fd76863eScolyli@suse.de /* make sure good_sectors won't go across barrier unit boundary */ 2743fd76863eScolyli@suse.de good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); 27441da177e4SLinus Torvalds 27458f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 27463cb03002SNeilBrown struct md_rdev *rdev; 27471da177e4SLinus Torvalds bio = r1_bio->bios[i]; 27481da177e4SLinus Torvalds 27493e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 27503e198f78SNeilBrown if (rdev == NULL || 27513e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 27528f19ccb2SNeilBrown if (i < conf->raid_disks) 2753e3b9703eSNeilBrown still_degraded = 1; 27543e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 2755c34b7ac6SChristoph Hellwig bio->bi_opf = REQ_OP_WRITE; 27561da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 27571da177e4SLinus Torvalds write_targets ++; 27583e198f78SNeilBrown } else { 27593e198f78SNeilBrown /* may need to read from here */ 276006f60385SNeilBrown sector_t first_bad = MaxSector; 276106f60385SNeilBrown int bad_sectors; 276206f60385SNeilBrown 276306f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 276406f60385SNeilBrown &first_bad, &bad_sectors)) { 276506f60385SNeilBrown if (first_bad > sector_nr) 276606f60385SNeilBrown good_sectors = first_bad - sector_nr; 276706f60385SNeilBrown else { 276806f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 276906f60385SNeilBrown if (min_bad == 0 || 277006f60385SNeilBrown min_bad > bad_sectors) 277106f60385SNeilBrown min_bad = bad_sectors; 277206f60385SNeilBrown } 277306f60385SNeilBrown } 277406f60385SNeilBrown if (sector_nr < first_bad) { 27753e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 27763e198f78SNeilBrown if (wonly < 0) 27773e198f78SNeilBrown wonly = i; 27783e198f78SNeilBrown } else { 27793e198f78SNeilBrown if (disk < 0) 27803e198f78SNeilBrown disk = i; 27813e198f78SNeilBrown } 2782c34b7ac6SChristoph Hellwig bio->bi_opf = REQ_OP_READ; 278306f60385SNeilBrown bio->bi_end_io = end_sync_read; 27843e198f78SNeilBrown read_targets++; 2785d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) && 2786d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 2787d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 2788d57368afSAlexander Lyakas /* 2789d57368afSAlexander Lyakas * The device is suitable for reading (InSync), 2790d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them, 2791d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave 2792d57368afSAlexander Lyakas * this device alone for this sync request. 2793d57368afSAlexander Lyakas */ 2794c34b7ac6SChristoph Hellwig bio->bi_opf = REQ_OP_WRITE; 2795d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write; 2796d57368afSAlexander Lyakas write_targets++; 27973e198f78SNeilBrown } 279806f60385SNeilBrown } 2799028288dfSZhiqiang Liu if (rdev && bio->bi_end_io) { 28003e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 28014f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; 280274d46992SChristoph Hellwig bio_set_dev(bio, rdev->bdev); 28032e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) 28042e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 28051da177e4SLinus Torvalds } 280606f60385SNeilBrown } 28073e198f78SNeilBrown rcu_read_unlock(); 28083e198f78SNeilBrown if (disk < 0) 28093e198f78SNeilBrown disk = wonly; 28103e198f78SNeilBrown r1_bio->read_disk = disk; 2811191ea9b2SNeilBrown 281206f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 281306f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 281406f60385SNeilBrown * need to mark them bad on all write targets 281506f60385SNeilBrown */ 281606f60385SNeilBrown int ok = 1; 28178f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 281806f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2819a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 282006f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 282106f60385SNeilBrown min_bad, 0 282206f60385SNeilBrown ) && ok; 282306f60385SNeilBrown } 28242953079cSShaohua Li set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 282506f60385SNeilBrown *skipped = 1; 282606f60385SNeilBrown put_buf(r1_bio); 282706f60385SNeilBrown 282806f60385SNeilBrown if (!ok) { 282906f60385SNeilBrown /* Cannot record the badblocks, so need to 283006f60385SNeilBrown * abort the resync. 283106f60385SNeilBrown * If there are multiple read targets, could just 283206f60385SNeilBrown * fail the really bad ones ??? 283306f60385SNeilBrown */ 283406f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 283506f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 283606f60385SNeilBrown return 0; 283706f60385SNeilBrown } else 283806f60385SNeilBrown return min_bad; 283906f60385SNeilBrown 284006f60385SNeilBrown } 284106f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 284206f60385SNeilBrown /* only resync enough to reach the next bad->good 284306f60385SNeilBrown * transition */ 284406f60385SNeilBrown good_sectors = min_bad; 284506f60385SNeilBrown } 284606f60385SNeilBrown 28473e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 28483e198f78SNeilBrown /* extra read targets are also write targets */ 28493e198f78SNeilBrown write_targets += read_targets-1; 28503e198f78SNeilBrown 28513e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 28521da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 28531da177e4SLinus Torvalds * drives must be failed - so we are finished 28541da177e4SLinus Torvalds */ 2855b7219ccbSNeilBrown sector_t rv; 2856b7219ccbSNeilBrown if (min_bad > 0) 2857b7219ccbSNeilBrown max_sector = sector_nr + min_bad; 2858b7219ccbSNeilBrown rv = max_sector - sector_nr; 285957afd89fSNeilBrown *skipped = 1; 28601da177e4SLinus Torvalds put_buf(r1_bio); 28611da177e4SLinus Torvalds return rv; 28621da177e4SLinus Torvalds } 28631da177e4SLinus Torvalds 2864c6207277SNeilBrown if (max_sector > mddev->resync_max) 2865c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 286606f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 286706f60385SNeilBrown max_sector = sector_nr + good_sectors; 28681da177e4SLinus Torvalds nr_sectors = 0; 2869289e99e8SNeilBrown sync_blocks = 0; 28701da177e4SLinus Torvalds do { 28711da177e4SLinus Torvalds struct page *page; 28721da177e4SLinus Torvalds int len = PAGE_SIZE; 28731da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 28741da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 28751da177e4SLinus Torvalds if (len == 0) 28761da177e4SLinus Torvalds break; 2877ab7a30c7SNeilBrown if (sync_blocks == 0) { 2878e64e4018SAndy Shevchenko if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, 2879e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2880e5de485fSNeilBrown !conf->fullsync && 2881e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2882191ea9b2SNeilBrown break; 28837571ae88SNeilBrown if ((len >> 9) > sync_blocks) 28846a806c51SNeilBrown len = sync_blocks<<9; 2885ab7a30c7SNeilBrown } 2886191ea9b2SNeilBrown 28878f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 288898d30c58SMing Lei struct resync_pages *rp; 288998d30c58SMing Lei 28901da177e4SLinus Torvalds bio = r1_bio->bios[i]; 289198d30c58SMing Lei rp = get_resync_pages(bio); 28921da177e4SLinus Torvalds if (bio->bi_end_io) { 2893022e510fSMing Lei page = resync_fetch_page(rp, page_idx); 2894c85ba149SMing Lei 2895c85ba149SMing Lei /* 2896c85ba149SMing Lei * won't fail because the vec table is big 2897c85ba149SMing Lei * enough to hold all these pages 2898c85ba149SMing Lei */ 2899f8312322SJohannes Thumshirn __bio_add_page(bio, page, len, 0); 29001da177e4SLinus Torvalds } 29011da177e4SLinus Torvalds } 29021da177e4SLinus Torvalds nr_sectors += len>>9; 29031da177e4SLinus Torvalds sector_nr += len>>9; 2904191ea9b2SNeilBrown sync_blocks -= (len>>9); 2905022e510fSMing Lei } while (++page_idx < RESYNC_PAGES); 290698d30c58SMing Lei 29071da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 29081da177e4SLinus Torvalds 2909c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) && 2910c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) { 2911c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed; 2912c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; 2913c40f341fSGoldwyn Rodrigues /* Send resync message */ 2914c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev, 2915c40f341fSGoldwyn Rodrigues conf->cluster_sync_low, 2916c40f341fSGoldwyn Rodrigues conf->cluster_sync_high); 2917c40f341fSGoldwyn Rodrigues } 2918c40f341fSGoldwyn Rodrigues 2919d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2920d11c171eSNeilBrown * compare 2921d11c171eSNeilBrown */ 2922d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2923d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 29242d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2925d11c171eSNeilBrown bio = r1_bio->bios[i]; 2926d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 29272d4f4f33SNeilBrown read_targets--; 292874d46992SChristoph Hellwig md_sync_acct_bio(bio, nr_sectors); 29292e52d449SNeilBrown if (read_targets == 1) 29302e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2931ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 2932d11c171eSNeilBrown } 2933d11c171eSNeilBrown } 2934d11c171eSNeilBrown } else { 2935d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2936d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 293774d46992SChristoph Hellwig md_sync_acct_bio(bio, nr_sectors); 29382e52d449SNeilBrown if (read_targets == 1) 29392e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2940ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 2941d11c171eSNeilBrown } 29421da177e4SLinus Torvalds return nr_sectors; 29431da177e4SLinus Torvalds } 29441da177e4SLinus Torvalds 2945fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 294680c3a6ceSDan Williams { 294780c3a6ceSDan Williams if (sectors) 294880c3a6ceSDan Williams return sectors; 294980c3a6ceSDan Williams 295080c3a6ceSDan Williams return mddev->dev_sectors; 295180c3a6ceSDan Williams } 295280c3a6ceSDan Williams 2953e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 29541da177e4SLinus Torvalds { 2955e8096360SNeilBrown struct r1conf *conf; 2956709ae487SNeilBrown int i; 29570eaf822cSJonathan Brassow struct raid1_info *disk; 29583cb03002SNeilBrown struct md_rdev *rdev; 2959709ae487SNeilBrown int err = -ENOMEM; 29601da177e4SLinus Torvalds 2961e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 29621da177e4SLinus Torvalds if (!conf) 2963709ae487SNeilBrown goto abort; 29641da177e4SLinus Torvalds 2965fd76863eScolyli@suse.de conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, 2966824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2967fd76863eScolyli@suse.de if (!conf->nr_pending) 2968fd76863eScolyli@suse.de goto abort; 2969fd76863eScolyli@suse.de 2970fd76863eScolyli@suse.de conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, 2971824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2972fd76863eScolyli@suse.de if (!conf->nr_waiting) 2973fd76863eScolyli@suse.de goto abort; 2974fd76863eScolyli@suse.de 2975fd76863eScolyli@suse.de conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, 2976824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2977fd76863eScolyli@suse.de if (!conf->nr_queued) 2978fd76863eScolyli@suse.de goto abort; 2979fd76863eScolyli@suse.de 2980fd76863eScolyli@suse.de conf->barrier = kcalloc(BARRIER_BUCKETS_NR, 2981824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2982fd76863eScolyli@suse.de if (!conf->barrier) 2983fd76863eScolyli@suse.de goto abort; 2984fd76863eScolyli@suse.de 29856396bb22SKees Cook conf->mirrors = kzalloc(array3_size(sizeof(struct raid1_info), 29866396bb22SKees Cook mddev->raid_disks, 2), 29871da177e4SLinus Torvalds GFP_KERNEL); 29881da177e4SLinus Torvalds if (!conf->mirrors) 2989709ae487SNeilBrown goto abort; 29901da177e4SLinus Torvalds 2991ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 2992ddaf22abSNeilBrown if (!conf->tmppage) 2993709ae487SNeilBrown goto abort; 2994ddaf22abSNeilBrown 2995709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 29961da177e4SLinus Torvalds if (!conf->poolinfo) 2997709ae487SNeilBrown goto abort; 29988f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 29993f677f9cSMarcos Paulo de Souza err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc, 3000c7afa803SMarcos Paulo de Souza rbio_pool_free, conf->poolinfo); 3001afeee514SKent Overstreet if (err) 3002709ae487SNeilBrown goto abort; 3003709ae487SNeilBrown 3004afeee514SKent Overstreet err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); 3005afeee514SKent Overstreet if (err) 3006c230e7e5SNeilBrown goto abort; 3007c230e7e5SNeilBrown 3008ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 30091da177e4SLinus Torvalds 3010c19d5798SNeilBrown err = -EINVAL; 3011e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 3012dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 3013709ae487SNeilBrown int disk_idx = rdev->raid_disk; 30141da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 30151da177e4SLinus Torvalds || disk_idx < 0) 30161da177e4SLinus Torvalds continue; 3017c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 301802b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx; 3019c19d5798SNeilBrown else 30201da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 30211da177e4SLinus Torvalds 3022c19d5798SNeilBrown if (disk->rdev) 3023c19d5798SNeilBrown goto abort; 30241da177e4SLinus Torvalds disk->rdev = rdev; 30251da177e4SLinus Torvalds disk->head_position = 0; 302612cee5a8SShaohua Li disk->seq_start = MaxSector; 30271da177e4SLinus Torvalds } 30281da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 30291da177e4SLinus Torvalds conf->mddev = mddev; 30301da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 303155ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list); 30321da177e4SLinus Torvalds 30331da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 303417999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 30351da177e4SLinus Torvalds 3036191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 3037d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 3038191ea9b2SNeilBrown 3039c19d5798SNeilBrown err = -EIO; 30408f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 30411da177e4SLinus Torvalds 30421da177e4SLinus Torvalds disk = conf->mirrors + i; 30431da177e4SLinus Torvalds 3044c19d5798SNeilBrown if (i < conf->raid_disks && 3045c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 3046c19d5798SNeilBrown /* This slot has a replacement. */ 3047c19d5798SNeilBrown if (!disk->rdev) { 3048c19d5798SNeilBrown /* No original, just make the replacement 3049c19d5798SNeilBrown * a recovering spare 3050c19d5798SNeilBrown */ 3051c19d5798SNeilBrown disk->rdev = 3052c19d5798SNeilBrown disk[conf->raid_disks].rdev; 3053c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 3054c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 3055c19d5798SNeilBrown /* Original is not in_sync - bad */ 3056c19d5798SNeilBrown goto abort; 3057c19d5798SNeilBrown } 3058c19d5798SNeilBrown 30595fd6c1dcSNeilBrown if (!disk->rdev || 30605fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 30611da177e4SLinus Torvalds disk->head_position = 0; 30624f0a5e01SJonathan Brassow if (disk->rdev && 30634f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 306417571284SNeilBrown conf->fullsync = 1; 3065be4d3280SShaohua Li } 30661da177e4SLinus Torvalds } 3067709ae487SNeilBrown 3068709ae487SNeilBrown err = -ENOMEM; 306944693154SYu Kuai rcu_assign_pointer(conf->thread, 307044693154SYu Kuai md_register_thread(raid1d, mddev, "raid1")); 30711d41c216SNeilBrown if (!conf->thread) 3072709ae487SNeilBrown goto abort; 3073191ea9b2SNeilBrown 3074709ae487SNeilBrown return conf; 3075709ae487SNeilBrown 3076709ae487SNeilBrown abort: 3077709ae487SNeilBrown if (conf) { 3078afeee514SKent Overstreet mempool_exit(&conf->r1bio_pool); 3079709ae487SNeilBrown kfree(conf->mirrors); 3080709ae487SNeilBrown safe_put_page(conf->tmppage); 3081709ae487SNeilBrown kfree(conf->poolinfo); 3082fd76863eScolyli@suse.de kfree(conf->nr_pending); 3083fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3084fd76863eScolyli@suse.de kfree(conf->nr_queued); 3085fd76863eScolyli@suse.de kfree(conf->barrier); 3086afeee514SKent Overstreet bioset_exit(&conf->bio_split); 3087709ae487SNeilBrown kfree(conf); 3088709ae487SNeilBrown } 3089709ae487SNeilBrown return ERR_PTR(err); 3090709ae487SNeilBrown } 3091709ae487SNeilBrown 3092afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv); 3093849674e4SShaohua Li static int raid1_run(struct mddev *mddev) 3094709ae487SNeilBrown { 3095e8096360SNeilBrown struct r1conf *conf; 3096709ae487SNeilBrown int i; 30973cb03002SNeilBrown struct md_rdev *rdev; 30985220ea1eSmajianpeng int ret; 3099709ae487SNeilBrown 3100709ae487SNeilBrown if (mddev->level != 1) { 31011d41c216SNeilBrown pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", 3102709ae487SNeilBrown mdname(mddev), mddev->level); 3103709ae487SNeilBrown return -EIO; 3104709ae487SNeilBrown } 3105709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 31061d41c216SNeilBrown pr_warn("md/raid1:%s: reshape_position set but not supported\n", 3107709ae487SNeilBrown mdname(mddev)); 3108709ae487SNeilBrown return -EIO; 3109709ae487SNeilBrown } 3110a415c0f1SNeilBrown if (mddev_init_writes_pending(mddev) < 0) 3111a415c0f1SNeilBrown return -ENOMEM; 3112709ae487SNeilBrown /* 3113709ae487SNeilBrown * copy the already verified devices into our private RAID1 3114709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 3115afa0f557SNeilBrown * should be freed in raid1_free()] 3116709ae487SNeilBrown */ 3117709ae487SNeilBrown if (mddev->private == NULL) 3118709ae487SNeilBrown conf = setup_conf(mddev); 3119709ae487SNeilBrown else 3120709ae487SNeilBrown conf = mddev->private; 3121709ae487SNeilBrown 3122709ae487SNeilBrown if (IS_ERR(conf)) 3123709ae487SNeilBrown return PTR_ERR(conf); 3124709ae487SNeilBrown 312510fa225cSChristoph Hellwig if (mddev->queue) 31263deff1a7SChristoph Hellwig blk_queue_max_write_zeroes_sectors(mddev->queue, 0); 31275026d7a9SH. Peter Anvin 3128dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 31291ed7242eSJonathan Brassow if (!mddev->gendisk) 31301ed7242eSJonathan Brassow continue; 3131709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 3132709ae487SNeilBrown rdev->data_offset << 9); 3133709ae487SNeilBrown } 3134709ae487SNeilBrown 3135709ae487SNeilBrown mddev->degraded = 0; 3136709ae487SNeilBrown for (i = 0; i < conf->raid_disks; i++) 3137709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 3138709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 3139709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 3140709ae487SNeilBrown mddev->degraded++; 314107f1a685SYufen Yu /* 314207f1a685SYufen Yu * RAID1 needs at least one disk in active 314307f1a685SYufen Yu */ 314407f1a685SYufen Yu if (conf->raid_disks - mddev->degraded < 1) { 3145b611ad14SJiang Li md_unregister_thread(&conf->thread); 314607f1a685SYufen Yu ret = -EINVAL; 314707f1a685SYufen Yu goto abort; 314807f1a685SYufen Yu } 3149709ae487SNeilBrown 3150709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 3151709ae487SNeilBrown mddev->recovery_cp = MaxSector; 3152709ae487SNeilBrown 31538c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 31541d41c216SNeilBrown pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", 31558c6ac868SAndre Noll mdname(mddev)); 31561d41c216SNeilBrown pr_info("md/raid1:%s: active with %d out of %d mirrors\n", 31571da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 31581da177e4SLinus Torvalds mddev->raid_disks); 3159709ae487SNeilBrown 31601da177e4SLinus Torvalds /* 31611da177e4SLinus Torvalds * Ok, everything is just fine now 31621da177e4SLinus Torvalds */ 316344693154SYu Kuai rcu_assign_pointer(mddev->thread, conf->thread); 316444693154SYu Kuai rcu_assign_pointer(conf->thread, NULL); 3165709ae487SNeilBrown mddev->private = conf; 316646533ff7SNeilBrown set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); 3167709ae487SNeilBrown 31681f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 31691da177e4SLinus Torvalds 31705220ea1eSmajianpeng ret = md_integrity_register(mddev); 31715aa61f42SNeilBrown if (ret) { 31725aa61f42SNeilBrown md_unregister_thread(&mddev->thread); 317307f1a685SYufen Yu goto abort; 31745aa61f42SNeilBrown } 317507f1a685SYufen Yu return 0; 317607f1a685SYufen Yu 317707f1a685SYufen Yu abort: 317807f1a685SYufen Yu raid1_free(mddev, conf); 31795220ea1eSmajianpeng return ret; 31801da177e4SLinus Torvalds } 31811da177e4SLinus Torvalds 3182afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv) 31831da177e4SLinus Torvalds { 3184afa0f557SNeilBrown struct r1conf *conf = priv; 31854b6d287fSNeilBrown 3186afeee514SKent Overstreet mempool_exit(&conf->r1bio_pool); 31871da177e4SLinus Torvalds kfree(conf->mirrors); 31880fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage); 31891da177e4SLinus Torvalds kfree(conf->poolinfo); 3190fd76863eScolyli@suse.de kfree(conf->nr_pending); 3191fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3192fd76863eScolyli@suse.de kfree(conf->nr_queued); 3193fd76863eScolyli@suse.de kfree(conf->barrier); 3194afeee514SKent Overstreet bioset_exit(&conf->bio_split); 31951da177e4SLinus Torvalds kfree(conf); 31961da177e4SLinus Torvalds } 31971da177e4SLinus Torvalds 3198fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 31991da177e4SLinus Torvalds { 32001da177e4SLinus Torvalds /* no resync is happening, and there is enough space 32011da177e4SLinus Torvalds * on all devices, so we can resize. 32021da177e4SLinus Torvalds * We need to make sure resync covers any new space. 32031da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 32041da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 32051da177e4SLinus Torvalds * worth it. 32061da177e4SLinus Torvalds */ 3207a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 3208a4a6125aSNeilBrown if (mddev->external_size && 3209a4a6125aSNeilBrown mddev->array_sectors > newsize) 3210b522adcdSDan Williams return -EINVAL; 3211a4a6125aSNeilBrown if (mddev->bitmap) { 3212e64e4018SAndy Shevchenko int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); 3213a4a6125aSNeilBrown if (ret) 3214a4a6125aSNeilBrown return ret; 3215a4a6125aSNeilBrown } 3216a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 3217b522adcdSDan Williams if (sectors > mddev->dev_sectors && 3218b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 321958c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 32201da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 32211da177e4SLinus Torvalds } 3222b522adcdSDan Williams mddev->dev_sectors = sectors; 32234b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 32241da177e4SLinus Torvalds return 0; 32251da177e4SLinus Torvalds } 32261da177e4SLinus Torvalds 3227fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 32281da177e4SLinus Torvalds { 32291da177e4SLinus Torvalds /* We need to: 32301da177e4SLinus Torvalds * 1/ resize the r1bio_pool 32311da177e4SLinus Torvalds * 2/ resize conf->mirrors 32321da177e4SLinus Torvalds * 32331da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 32341da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 32351da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 32366ea9c07cSNeilBrown * 32376ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 32386ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 32391da177e4SLinus Torvalds */ 3240afeee514SKent Overstreet mempool_t newpool, oldpool; 32411da177e4SLinus Torvalds struct pool_info *newpoolinfo; 32420eaf822cSJonathan Brassow struct raid1_info *newmirrors; 3243e8096360SNeilBrown struct r1conf *conf = mddev->private; 324463c70c4fSNeilBrown int cnt, raid_disks; 3245c04be0aaSNeilBrown unsigned long flags; 32462214c260SArtur Paszkiewicz int d, d2; 3247afeee514SKent Overstreet int ret; 3248afeee514SKent Overstreet 3249afeee514SKent Overstreet memset(&newpool, 0, sizeof(newpool)); 3250afeee514SKent Overstreet memset(&oldpool, 0, sizeof(oldpool)); 32511da177e4SLinus Torvalds 325263c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 3253664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 325463c70c4fSNeilBrown mddev->layout != mddev->new_layout || 325563c70c4fSNeilBrown mddev->level != mddev->new_level) { 3256664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 325763c70c4fSNeilBrown mddev->new_layout = mddev->layout; 325863c70c4fSNeilBrown mddev->new_level = mddev->level; 325963c70c4fSNeilBrown return -EINVAL; 326063c70c4fSNeilBrown } 326163c70c4fSNeilBrown 32622214c260SArtur Paszkiewicz if (!mddev_is_clustered(mddev)) 32632214c260SArtur Paszkiewicz md_allow_write(mddev); 32642a2275d6SNeilBrown 326563c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 326663c70c4fSNeilBrown 32676ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 32686ea9c07cSNeilBrown cnt=0; 32696ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 32701da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 32716ea9c07cSNeilBrown cnt++; 32726ea9c07cSNeilBrown if (cnt > raid_disks) 32731da177e4SLinus Torvalds return -EBUSY; 32746ea9c07cSNeilBrown } 32751da177e4SLinus Torvalds 32761da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 32771da177e4SLinus Torvalds if (!newpoolinfo) 32781da177e4SLinus Torvalds return -ENOMEM; 32791da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 32808f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 32811da177e4SLinus Torvalds 32823f677f9cSMarcos Paulo de Souza ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc, 3283c7afa803SMarcos Paulo de Souza rbio_pool_free, newpoolinfo); 3284afeee514SKent Overstreet if (ret) { 32851da177e4SLinus Torvalds kfree(newpoolinfo); 3286afeee514SKent Overstreet return ret; 32871da177e4SLinus Torvalds } 32886396bb22SKees Cook newmirrors = kzalloc(array3_size(sizeof(struct raid1_info), 32896396bb22SKees Cook raid_disks, 2), 32908f19ccb2SNeilBrown GFP_KERNEL); 32911da177e4SLinus Torvalds if (!newmirrors) { 32921da177e4SLinus Torvalds kfree(newpoolinfo); 3293afeee514SKent Overstreet mempool_exit(&newpool); 32941da177e4SLinus Torvalds return -ENOMEM; 32951da177e4SLinus Torvalds } 32961da177e4SLinus Torvalds 3297e2d59925SNeilBrown freeze_array(conf, 0); 32981da177e4SLinus Torvalds 32991da177e4SLinus Torvalds /* ok, everything is stopped */ 33001da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 33011da177e4SLinus Torvalds conf->r1bio_pool = newpool; 33026ea9c07cSNeilBrown 3303a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 33043cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 3305a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 330636fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 3307a88aa786SNeilBrown rdev->raid_disk = d2; 330836fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 330936fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 33101d41c216SNeilBrown pr_warn("md/raid1:%s: cannot register rd%d\n", 331136fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 3312a88aa786SNeilBrown } 3313a88aa786SNeilBrown if (rdev) 3314a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 33156ea9c07cSNeilBrown } 33161da177e4SLinus Torvalds kfree(conf->mirrors); 33171da177e4SLinus Torvalds conf->mirrors = newmirrors; 33181da177e4SLinus Torvalds kfree(conf->poolinfo); 33191da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 33201da177e4SLinus Torvalds 3321c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 33221da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 3323c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 33241da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 332563c70c4fSNeilBrown mddev->delta_disks = 0; 33261da177e4SLinus Torvalds 3327e2d59925SNeilBrown unfreeze_array(conf); 33281da177e4SLinus Torvalds 3329985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 33301da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 33311da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 33321da177e4SLinus Torvalds 3333afeee514SKent Overstreet mempool_exit(&oldpool); 33341da177e4SLinus Torvalds return 0; 33351da177e4SLinus Torvalds } 33361da177e4SLinus Torvalds 3337b03e0ccbSNeilBrown static void raid1_quiesce(struct mddev *mddev, int quiesce) 333836fa3063SNeilBrown { 3339e8096360SNeilBrown struct r1conf *conf = mddev->private; 334036fa3063SNeilBrown 3341b03e0ccbSNeilBrown if (quiesce) 334207169fd4Smajianpeng freeze_array(conf, 0); 3343b03e0ccbSNeilBrown else 334407169fd4Smajianpeng unfreeze_array(conf); 334536fa3063SNeilBrown } 334636fa3063SNeilBrown 3347fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 3348709ae487SNeilBrown { 3349709ae487SNeilBrown /* raid1 can take over: 3350709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 3351709ae487SNeilBrown */ 3352709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 3353e8096360SNeilBrown struct r1conf *conf; 3354709ae487SNeilBrown mddev->new_level = 1; 3355709ae487SNeilBrown mddev->new_layout = 0; 3356709ae487SNeilBrown mddev->new_chunk_sectors = 0; 3357709ae487SNeilBrown conf = setup_conf(mddev); 33586995f0b2SShaohua Li if (!IS_ERR(conf)) { 335907169fd4Smajianpeng /* Array must appear to be quiesced */ 336007169fd4Smajianpeng conf->array_frozen = 1; 3361394ed8e4SShaohua Li mddev_clear_unsupported_flags(mddev, 3362394ed8e4SShaohua Li UNSUPPORTED_MDDEV_FLAGS); 33636995f0b2SShaohua Li } 3364709ae487SNeilBrown return conf; 3365709ae487SNeilBrown } 3366709ae487SNeilBrown return ERR_PTR(-EINVAL); 3367709ae487SNeilBrown } 33681da177e4SLinus Torvalds 336984fc4b56SNeilBrown static struct md_personality raid1_personality = 33701da177e4SLinus Torvalds { 33711da177e4SLinus Torvalds .name = "raid1", 33722604b703SNeilBrown .level = 1, 33731da177e4SLinus Torvalds .owner = THIS_MODULE, 3374849674e4SShaohua Li .make_request = raid1_make_request, 3375849674e4SShaohua Li .run = raid1_run, 3376afa0f557SNeilBrown .free = raid1_free, 3377849674e4SShaohua Li .status = raid1_status, 3378849674e4SShaohua Li .error_handler = raid1_error, 33791da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 33801da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 33811da177e4SLinus Torvalds .spare_active = raid1_spare_active, 3382849674e4SShaohua Li .sync_request = raid1_sync_request, 33831da177e4SLinus Torvalds .resize = raid1_resize, 338480c3a6ceSDan Williams .size = raid1_size, 338563c70c4fSNeilBrown .check_reshape = raid1_reshape, 338636fa3063SNeilBrown .quiesce = raid1_quiesce, 3387709ae487SNeilBrown .takeover = raid1_takeover, 33881da177e4SLinus Torvalds }; 33891da177e4SLinus Torvalds 33901da177e4SLinus Torvalds static int __init raid_init(void) 33911da177e4SLinus Torvalds { 33922604b703SNeilBrown return register_md_personality(&raid1_personality); 33931da177e4SLinus Torvalds } 33941da177e4SLinus Torvalds 33951da177e4SLinus Torvalds static void raid_exit(void) 33961da177e4SLinus Torvalds { 33972604b703SNeilBrown unregister_md_personality(&raid1_personality); 33981da177e4SLinus Torvalds } 33991da177e4SLinus Torvalds 34001da177e4SLinus Torvalds module_init(raid_init); 34011da177e4SLinus Torvalds module_exit(raid_exit); 34021da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 34030efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 34041da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3405d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 34062604b703SNeilBrown MODULE_ALIAS("md-level-1"); 3407