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 307a0159832SGuoqing Jiang if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) 308a0159832SGuoqing Jiang bio_end_io_acct(bio, r1_bio->start_time); 3094246a0b6SChristoph Hellwig bio_endio(bio); 310d2eb35acSNeilBrown } 311d2eb35acSNeilBrown 3129f2c9d12SNeilBrown static void raid_end_bio_io(struct r1bio *r1_bio) 3131da177e4SLinus Torvalds { 3141da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 315c91114c2SDavid Jeffery struct r1conf *conf = r1_bio->mddev->private; 3161da177e4SLinus Torvalds 3174b6d287fSNeilBrown /* if nobody has done the final endio yet, do it now */ 3184b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 31936a4e1feSNeilBrown pr_debug("raid1: sync end %s on sectors %llu-%llu\n", 3204b6d287fSNeilBrown (bio_data_dir(bio) == WRITE) ? "write" : "read", 3214f024f37SKent Overstreet (unsigned long long) bio->bi_iter.bi_sector, 3224f024f37SKent Overstreet (unsigned long long) bio_end_sector(bio) - 1); 3234b6d287fSNeilBrown 324d2eb35acSNeilBrown call_bio_endio(r1_bio); 3254b6d287fSNeilBrown } 326c91114c2SDavid Jeffery /* 327c91114c2SDavid Jeffery * Wake up any possible resync thread that waits for the device 328c91114c2SDavid Jeffery * to go idle. All I/Os, even write-behind writes, are done. 329c91114c2SDavid Jeffery */ 330c91114c2SDavid Jeffery allow_barrier(conf, r1_bio->sector); 331c91114c2SDavid Jeffery 3321da177e4SLinus Torvalds free_r1bio(r1_bio); 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds /* 3361da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 3371da177e4SLinus Torvalds */ 3389f2c9d12SNeilBrown static inline void update_head_pos(int disk, struct r1bio *r1_bio) 3391da177e4SLinus Torvalds { 340e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds conf->mirrors[disk].head_position = 3431da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 3441da177e4SLinus Torvalds } 3451da177e4SLinus Torvalds 346ba3ae3beSNamhyung Kim /* 347ba3ae3beSNamhyung Kim * Find the disk number which triggered given bio 348ba3ae3beSNamhyung Kim */ 3499f2c9d12SNeilBrown static int find_bio_disk(struct r1bio *r1_bio, struct bio *bio) 350ba3ae3beSNamhyung Kim { 351ba3ae3beSNamhyung Kim int mirror; 35230194636SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 35330194636SNeilBrown int raid_disks = conf->raid_disks; 354ba3ae3beSNamhyung Kim 3558f19ccb2SNeilBrown for (mirror = 0; mirror < raid_disks * 2; mirror++) 356ba3ae3beSNamhyung Kim if (r1_bio->bios[mirror] == bio) 357ba3ae3beSNamhyung Kim break; 358ba3ae3beSNamhyung Kim 3598f19ccb2SNeilBrown BUG_ON(mirror == raid_disks * 2); 360ba3ae3beSNamhyung Kim update_head_pos(mirror, r1_bio); 361ba3ae3beSNamhyung Kim 362ba3ae3beSNamhyung Kim return mirror; 363ba3ae3beSNamhyung Kim } 364ba3ae3beSNamhyung Kim 3654246a0b6SChristoph Hellwig static void raid1_end_read_request(struct bio *bio) 3661da177e4SLinus Torvalds { 3674e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status; 3689f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 369e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 370e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[r1_bio->read_disk].rdev; 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds /* 3731da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3741da177e4SLinus Torvalds */ 375e5872d58SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 376ddaf22abSNeilBrown 377220946c9SNeilBrown if (uptodate) 3781da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3792e52d449SNeilBrown else if (test_bit(FailFast, &rdev->flags) && 3802e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 3812e52d449SNeilBrown /* This was a fail-fast read so we definitely 3822e52d449SNeilBrown * want to retry */ 3832e52d449SNeilBrown ; 384dd00a99eSNeilBrown else { 385dd00a99eSNeilBrown /* If all other devices have failed, we want to return 386dd00a99eSNeilBrown * the error upwards rather than fail the last device. 387dd00a99eSNeilBrown * Here we redefine "uptodate" to mean "Don't want to retry" 388dd00a99eSNeilBrown */ 389dd00a99eSNeilBrown unsigned long flags; 390dd00a99eSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 391dd00a99eSNeilBrown if (r1_bio->mddev->degraded == conf->raid_disks || 392dd00a99eSNeilBrown (r1_bio->mddev->degraded == conf->raid_disks-1 && 393e5872d58SNeilBrown test_bit(In_sync, &rdev->flags))) 394dd00a99eSNeilBrown uptodate = 1; 395dd00a99eSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 396dd00a99eSNeilBrown } 3971da177e4SLinus Torvalds 3987ad4d4a6SNeilBrown if (uptodate) { 3991da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 400e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 4017ad4d4a6SNeilBrown } else { 4021da177e4SLinus Torvalds /* 4031da177e4SLinus Torvalds * oops, read error: 4041da177e4SLinus Torvalds */ 405913cce5aSChristoph Hellwig pr_err_ratelimited("md/raid1:%s: %pg: rescheduling sector %llu\n", 4069dd1e2faSNeilBrown mdname(conf->mddev), 407913cce5aSChristoph Hellwig rdev->bdev, 4088bda470eSChristian Dietrich (unsigned long long)r1_bio->sector); 409d2eb35acSNeilBrown set_bit(R1BIO_ReadError, &r1_bio->state); 4101da177e4SLinus Torvalds reschedule_retry(r1_bio); 4117ad4d4a6SNeilBrown /* don't drop the reference on read_disk yet */ 4121da177e4SLinus Torvalds } 4131da177e4SLinus Torvalds } 4141da177e4SLinus Torvalds 4159f2c9d12SNeilBrown static void close_write(struct r1bio *r1_bio) 4164e78064fSNeilBrown { 4174e78064fSNeilBrown /* it really is the end of this request */ 4184e78064fSNeilBrown if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 419841c1316SMing Lei bio_free_pages(r1_bio->behind_master_bio); 420841c1316SMing Lei bio_put(r1_bio->behind_master_bio); 421841c1316SMing Lei r1_bio->behind_master_bio = NULL; 4224e78064fSNeilBrown } 4234e78064fSNeilBrown /* clear the bitmap if all writes complete successfully */ 424e64e4018SAndy Shevchenko md_bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 4254e78064fSNeilBrown r1_bio->sectors, 4264e78064fSNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state), 427af6d7b76SNeilBrown test_bit(R1BIO_BehindIO, &r1_bio->state)); 4284e78064fSNeilBrown md_write_end(r1_bio->mddev); 429cd5ff9a1SNeilBrown } 430cd5ff9a1SNeilBrown 4319f2c9d12SNeilBrown static void r1_bio_write_done(struct r1bio *r1_bio) 432cd5ff9a1SNeilBrown { 433cd5ff9a1SNeilBrown if (!atomic_dec_and_test(&r1_bio->remaining)) 434cd5ff9a1SNeilBrown return; 435cd5ff9a1SNeilBrown 436cd5ff9a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 437cd5ff9a1SNeilBrown reschedule_retry(r1_bio); 438cd5ff9a1SNeilBrown else { 439cd5ff9a1SNeilBrown close_write(r1_bio); 4404367af55SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state)) 4414367af55SNeilBrown reschedule_retry(r1_bio); 4424367af55SNeilBrown else 4434e78064fSNeilBrown raid_end_bio_io(r1_bio); 4444e78064fSNeilBrown } 4454e78064fSNeilBrown } 4464e78064fSNeilBrown 4474246a0b6SChristoph Hellwig static void raid1_end_write_request(struct bio *bio) 4481da177e4SLinus Torvalds { 4499f2c9d12SNeilBrown struct r1bio *r1_bio = bio->bi_private; 450e5872d58SNeilBrown int behind = test_bit(R1BIO_BehindIO, &r1_bio->state); 451e8096360SNeilBrown struct r1conf *conf = r1_bio->mddev->private; 45204b857f7SNeilBrown struct bio *to_put = NULL; 453e5872d58SNeilBrown int mirror = find_bio_disk(r1_bio, bio); 454e5872d58SNeilBrown struct md_rdev *rdev = conf->mirrors[mirror].rdev; 455e3f948cdSShaohua Li bool discard_error; 45669df9cfcSGuoqing Jiang sector_t lo = r1_bio->sector; 45769df9cfcSGuoqing Jiang sector_t hi = r1_bio->sector + r1_bio->sectors; 458e3f948cdSShaohua Li 4594e4cbee9SChristoph Hellwig discard_error = bio->bi_status && bio_op(bio) == REQ_OP_DISCARD; 4601da177e4SLinus Torvalds 4611da177e4SLinus Torvalds /* 462e9c7469bSTejun Heo * 'one mirror IO has finished' event handler: 4631da177e4SLinus Torvalds */ 4644e4cbee9SChristoph Hellwig if (bio->bi_status && !discard_error) { 465e5872d58SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 466e5872d58SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 46719d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 46819d67169SNeilBrown conf->mddev->recovery); 46919d67169SNeilBrown 470212e7eb7SNeilBrown if (test_bit(FailFast, &rdev->flags) && 471212e7eb7SNeilBrown (bio->bi_opf & MD_FAILFAST) && 472212e7eb7SNeilBrown /* We never try FailFast to WriteMostly devices */ 473212e7eb7SNeilBrown !test_bit(WriteMostly, &rdev->flags)) { 474212e7eb7SNeilBrown md_error(r1_bio->mddev, rdev); 475eeba6809SYufen Yu } 476eeba6809SYufen Yu 477eeba6809SYufen Yu /* 478eeba6809SYufen Yu * When the device is faulty, it is not necessary to 479eeba6809SYufen Yu * handle write error. 480212e7eb7SNeilBrown */ 481eeba6809SYufen Yu if (!test_bit(Faulty, &rdev->flags)) 482212e7eb7SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 483212e7eb7SNeilBrown else { 4842417b986SPaul Clements /* Fail the request */ 4852417b986SPaul Clements set_bit(R1BIO_Degraded, &r1_bio->state); 486212e7eb7SNeilBrown /* Finished with this branch */ 487212e7eb7SNeilBrown r1_bio->bios[mirror] = NULL; 488212e7eb7SNeilBrown to_put = bio; 489212e7eb7SNeilBrown } 4904367af55SNeilBrown } else { 4911da177e4SLinus Torvalds /* 492e9c7469bSTejun Heo * Set R1BIO_Uptodate in our master bio, so that we 493e9c7469bSTejun Heo * will return a good error code for to the higher 494e9c7469bSTejun Heo * levels even if IO on some other mirrored buffer 495e9c7469bSTejun Heo * fails. 4961da177e4SLinus Torvalds * 497e9c7469bSTejun Heo * The 'master' represents the composite IO operation 498e9c7469bSTejun Heo * to user-side. So if something waits for IO, then it 499e9c7469bSTejun Heo * will wait for the 'master' bio. 5001da177e4SLinus Torvalds */ 5014367af55SNeilBrown sector_t first_bad; 5024367af55SNeilBrown int bad_sectors; 5034367af55SNeilBrown 504cd5ff9a1SNeilBrown r1_bio->bios[mirror] = NULL; 505cd5ff9a1SNeilBrown to_put = bio; 5063056e3aeSAlex Lyakas /* 5073056e3aeSAlex Lyakas * Do not set R1BIO_Uptodate if the current device is 5083056e3aeSAlex Lyakas * rebuilding or Faulty. This is because we cannot use 5093056e3aeSAlex Lyakas * such device for properly reading the data back (we could 5103056e3aeSAlex Lyakas * potentially use it, if the current write would have felt 5113056e3aeSAlex Lyakas * before rdev->recovery_offset, but for simplicity we don't 5123056e3aeSAlex Lyakas * check this here. 5133056e3aeSAlex Lyakas */ 514e5872d58SNeilBrown if (test_bit(In_sync, &rdev->flags) && 515e5872d58SNeilBrown !test_bit(Faulty, &rdev->flags)) 5161da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 5171da177e4SLinus Torvalds 5184367af55SNeilBrown /* Maybe we can clear some bad blocks. */ 519e5872d58SNeilBrown if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 520e3f948cdSShaohua Li &first_bad, &bad_sectors) && !discard_error) { 5214367af55SNeilBrown r1_bio->bios[mirror] = IO_MADE_GOOD; 5224367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 5234367af55SNeilBrown } 5244367af55SNeilBrown } 5254367af55SNeilBrown 5264b6d287fSNeilBrown if (behind) { 52769df9cfcSGuoqing Jiang if (test_bit(CollisionCheck, &rdev->flags)) 528404659cfSGuoqing Jiang remove_serial(rdev, lo, hi); 529e5872d58SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) 5304b6d287fSNeilBrown atomic_dec(&r1_bio->behind_remaining); 5314b6d287fSNeilBrown 532e9c7469bSTejun Heo /* 533e9c7469bSTejun Heo * In behind mode, we ACK the master bio once the I/O 534e9c7469bSTejun Heo * has safely reached all non-writemostly 535e9c7469bSTejun Heo * disks. Setting the Returned bit ensures that this 536e9c7469bSTejun Heo * gets done only once -- we don't ever want to return 537e9c7469bSTejun Heo * -EIO here, instead we'll wait 538e9c7469bSTejun Heo */ 5394b6d287fSNeilBrown if (atomic_read(&r1_bio->behind_remaining) >= (atomic_read(&r1_bio->remaining)-1) && 5404b6d287fSNeilBrown test_bit(R1BIO_Uptodate, &r1_bio->state)) { 5414b6d287fSNeilBrown /* Maybe we can return now */ 5424b6d287fSNeilBrown if (!test_and_set_bit(R1BIO_Returned, &r1_bio->state)) { 5434b6d287fSNeilBrown struct bio *mbio = r1_bio->master_bio; 54436a4e1feSNeilBrown pr_debug("raid1: behind end write sectors" 54536a4e1feSNeilBrown " %llu-%llu\n", 5464f024f37SKent Overstreet (unsigned long long) mbio->bi_iter.bi_sector, 5474f024f37SKent Overstreet (unsigned long long) bio_end_sector(mbio) - 1); 548d2eb35acSNeilBrown call_bio_endio(r1_bio); 5494b6d287fSNeilBrown } 5504b6d287fSNeilBrown } 55169df9cfcSGuoqing Jiang } else if (rdev->mddev->serialize_policy) 55269df9cfcSGuoqing Jiang remove_serial(rdev, lo, hi); 5534367af55SNeilBrown if (r1_bio->bios[mirror] == NULL) 554e5872d58SNeilBrown rdev_dec_pending(rdev, conf->mddev); 555e9c7469bSTejun Heo 5561da177e4SLinus Torvalds /* 5571da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 5581da177e4SLinus Torvalds * already. 5591da177e4SLinus Torvalds */ 560af6d7b76SNeilBrown r1_bio_write_done(r1_bio); 561c70810b3SNeilBrown 56204b857f7SNeilBrown if (to_put) 56304b857f7SNeilBrown bio_put(to_put); 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds 566fd76863eScolyli@suse.de static sector_t align_to_barrier_unit_end(sector_t start_sector, 567fd76863eScolyli@suse.de sector_t sectors) 568fd76863eScolyli@suse.de { 569fd76863eScolyli@suse.de sector_t len; 570fd76863eScolyli@suse.de 571fd76863eScolyli@suse.de WARN_ON(sectors == 0); 572fd76863eScolyli@suse.de /* 573fd76863eScolyli@suse.de * len is the number of sectors from start_sector to end of the 574fd76863eScolyli@suse.de * barrier unit which start_sector belongs to. 575fd76863eScolyli@suse.de */ 576fd76863eScolyli@suse.de len = round_up(start_sector + 1, BARRIER_UNIT_SECTOR_SIZE) - 577fd76863eScolyli@suse.de start_sector; 578fd76863eScolyli@suse.de 579fd76863eScolyli@suse.de if (len > sectors) 580fd76863eScolyli@suse.de len = sectors; 581fd76863eScolyli@suse.de 582fd76863eScolyli@suse.de return len; 583fd76863eScolyli@suse.de } 584fd76863eScolyli@suse.de 5851da177e4SLinus Torvalds /* 5861da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 5871da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 5881da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 5891da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 5901da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 5911da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 5921da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 5931da177e4SLinus Torvalds * 5941da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 5951da177e4SLinus Torvalds * because position is mirror, not device based. 5961da177e4SLinus Torvalds * 5971da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 5981da177e4SLinus Torvalds */ 599e8096360SNeilBrown static int read_balance(struct r1conf *conf, struct r1bio *r1_bio, int *max_sectors) 6001da177e4SLinus Torvalds { 601af3a2cd6SNeilBrown const sector_t this_sector = r1_bio->sector; 602d2eb35acSNeilBrown int sectors; 603d2eb35acSNeilBrown int best_good_sectors; 6049dedf603SShaohua Li int best_disk, best_dist_disk, best_pending_disk; 6059dedf603SShaohua Li int has_nonrot_disk; 606be4d3280SShaohua Li int disk; 60776073054SNeilBrown sector_t best_dist; 6089dedf603SShaohua Li unsigned int min_pending; 6093cb03002SNeilBrown struct md_rdev *rdev; 610f3ac8bf7SNeilBrown int choose_first; 61112cee5a8SShaohua Li int choose_next_idle; 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds rcu_read_lock(); 6141da177e4SLinus Torvalds /* 6158ddf9efeSNeilBrown * Check if we can balance. We can balance on the whole 6161da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 6171da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 6181da177e4SLinus Torvalds */ 6191da177e4SLinus Torvalds retry: 620d2eb35acSNeilBrown sectors = r1_bio->sectors; 62176073054SNeilBrown best_disk = -1; 6229dedf603SShaohua Li best_dist_disk = -1; 62376073054SNeilBrown best_dist = MaxSector; 6249dedf603SShaohua Li best_pending_disk = -1; 6259dedf603SShaohua Li min_pending = UINT_MAX; 626d2eb35acSNeilBrown best_good_sectors = 0; 6279dedf603SShaohua Li has_nonrot_disk = 0; 62812cee5a8SShaohua Li choose_next_idle = 0; 6292e52d449SNeilBrown clear_bit(R1BIO_FailFast, &r1_bio->state); 630d2eb35acSNeilBrown 6317d49ffcfSGoldwyn Rodrigues if ((conf->mddev->recovery_cp < this_sector + sectors) || 6327d49ffcfSGoldwyn Rodrigues (mddev_is_clustered(conf->mddev) && 63390382ed9SGoldwyn Rodrigues md_cluster_ops->area_resyncing(conf->mddev, READ, this_sector, 6347d49ffcfSGoldwyn Rodrigues this_sector + sectors))) 6357d49ffcfSGoldwyn Rodrigues choose_first = 1; 6367d49ffcfSGoldwyn Rodrigues else 6377d49ffcfSGoldwyn Rodrigues choose_first = 0; 6381da177e4SLinus Torvalds 639be4d3280SShaohua Li for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { 64076073054SNeilBrown sector_t dist; 641d2eb35acSNeilBrown sector_t first_bad; 642d2eb35acSNeilBrown int bad_sectors; 6439dedf603SShaohua Li unsigned int pending; 64412cee5a8SShaohua Li bool nonrot; 645d2eb35acSNeilBrown 646f3ac8bf7SNeilBrown rdev = rcu_dereference(conf->mirrors[disk].rdev); 647f3ac8bf7SNeilBrown if (r1_bio->bios[disk] == IO_BLOCKED 648f3ac8bf7SNeilBrown || rdev == NULL 64976073054SNeilBrown || test_bit(Faulty, &rdev->flags)) 650f3ac8bf7SNeilBrown continue; 65176073054SNeilBrown if (!test_bit(In_sync, &rdev->flags) && 65276073054SNeilBrown rdev->recovery_offset < this_sector + sectors) 65376073054SNeilBrown continue; 65476073054SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 65576073054SNeilBrown /* Don't balance among write-mostly, just 65676073054SNeilBrown * use the first as a last resort */ 657d1901ef0STomáš Hodek if (best_dist_disk < 0) { 658307729c8SNeilBrown if (is_badblock(rdev, this_sector, sectors, 659307729c8SNeilBrown &first_bad, &bad_sectors)) { 660816b0acfSWei Fang if (first_bad <= this_sector) 661307729c8SNeilBrown /* Cannot use this */ 662307729c8SNeilBrown continue; 663307729c8SNeilBrown best_good_sectors = first_bad - this_sector; 664307729c8SNeilBrown } else 665307729c8SNeilBrown best_good_sectors = sectors; 666d1901ef0STomáš Hodek best_dist_disk = disk; 667d1901ef0STomáš Hodek best_pending_disk = disk; 668307729c8SNeilBrown } 66976073054SNeilBrown continue; 6708ddf9efeSNeilBrown } 67176073054SNeilBrown /* This is a reasonable device to use. It might 67276073054SNeilBrown * even be best. 6731da177e4SLinus Torvalds */ 674d2eb35acSNeilBrown if (is_badblock(rdev, this_sector, sectors, 675d2eb35acSNeilBrown &first_bad, &bad_sectors)) { 676d2eb35acSNeilBrown if (best_dist < MaxSector) 677d2eb35acSNeilBrown /* already have a better device */ 678d2eb35acSNeilBrown continue; 679d2eb35acSNeilBrown if (first_bad <= this_sector) { 680d2eb35acSNeilBrown /* cannot read here. If this is the 'primary' 681d2eb35acSNeilBrown * device, then we must not read beyond 682d2eb35acSNeilBrown * bad_sectors from another device.. 683d2eb35acSNeilBrown */ 684d2eb35acSNeilBrown bad_sectors -= (this_sector - first_bad); 685d2eb35acSNeilBrown if (choose_first && sectors > bad_sectors) 686d2eb35acSNeilBrown sectors = bad_sectors; 687d2eb35acSNeilBrown if (best_good_sectors > sectors) 688d2eb35acSNeilBrown best_good_sectors = sectors; 689d2eb35acSNeilBrown 690d2eb35acSNeilBrown } else { 691d2eb35acSNeilBrown sector_t good_sectors = first_bad - this_sector; 692d2eb35acSNeilBrown if (good_sectors > best_good_sectors) { 693d2eb35acSNeilBrown best_good_sectors = good_sectors; 694d2eb35acSNeilBrown best_disk = disk; 695d2eb35acSNeilBrown } 696d2eb35acSNeilBrown if (choose_first) 697d2eb35acSNeilBrown break; 698d2eb35acSNeilBrown } 699d2eb35acSNeilBrown continue; 700d82dd0e3STomasz Majchrzak } else { 701d82dd0e3STomasz Majchrzak if ((sectors > best_good_sectors) && (best_disk >= 0)) 702d82dd0e3STomasz Majchrzak best_disk = -1; 703d2eb35acSNeilBrown best_good_sectors = sectors; 704d82dd0e3STomasz Majchrzak } 705d2eb35acSNeilBrown 7062e52d449SNeilBrown if (best_disk >= 0) 7072e52d449SNeilBrown /* At least two disks to choose from so failfast is OK */ 7082e52d449SNeilBrown set_bit(R1BIO_FailFast, &r1_bio->state); 7092e52d449SNeilBrown 71010f0d2a5SChristoph Hellwig nonrot = bdev_nonrot(rdev->bdev); 71112cee5a8SShaohua Li has_nonrot_disk |= nonrot; 7129dedf603SShaohua Li pending = atomic_read(&rdev->nr_pending); 71376073054SNeilBrown dist = abs(this_sector - conf->mirrors[disk].head_position); 71412cee5a8SShaohua Li if (choose_first) { 71576073054SNeilBrown best_disk = disk; 7161da177e4SLinus Torvalds break; 7171da177e4SLinus Torvalds } 71812cee5a8SShaohua Li /* Don't change to another disk for sequential reads */ 71912cee5a8SShaohua Li if (conf->mirrors[disk].next_seq_sect == this_sector 72012cee5a8SShaohua Li || dist == 0) { 72112cee5a8SShaohua Li int opt_iosize = bdev_io_opt(rdev->bdev) >> 9; 72212cee5a8SShaohua Li struct raid1_info *mirror = &conf->mirrors[disk]; 72312cee5a8SShaohua Li 72412cee5a8SShaohua Li best_disk = disk; 72512cee5a8SShaohua Li /* 72612cee5a8SShaohua Li * If buffered sequential IO size exceeds optimal 72712cee5a8SShaohua Li * iosize, check if there is idle disk. If yes, choose 72812cee5a8SShaohua Li * the idle disk. read_balance could already choose an 72912cee5a8SShaohua Li * idle disk before noticing it's a sequential IO in 73012cee5a8SShaohua Li * this disk. This doesn't matter because this disk 73112cee5a8SShaohua Li * will idle, next time it will be utilized after the 73212cee5a8SShaohua Li * first disk has IO size exceeds optimal iosize. In 73312cee5a8SShaohua Li * this way, iosize of the first disk will be optimal 73412cee5a8SShaohua Li * iosize at least. iosize of the second disk might be 73512cee5a8SShaohua Li * small, but not a big deal since when the second disk 73612cee5a8SShaohua Li * starts IO, the first disk is likely still busy. 73712cee5a8SShaohua Li */ 73812cee5a8SShaohua Li if (nonrot && opt_iosize > 0 && 73912cee5a8SShaohua Li mirror->seq_start != MaxSector && 74012cee5a8SShaohua Li mirror->next_seq_sect > opt_iosize && 74112cee5a8SShaohua Li mirror->next_seq_sect - opt_iosize >= 74212cee5a8SShaohua Li mirror->seq_start) { 74312cee5a8SShaohua Li choose_next_idle = 1; 74412cee5a8SShaohua Li continue; 74512cee5a8SShaohua Li } 74612cee5a8SShaohua Li break; 74712cee5a8SShaohua Li } 74812cee5a8SShaohua Li 74912cee5a8SShaohua Li if (choose_next_idle) 75012cee5a8SShaohua Li continue; 7519dedf603SShaohua Li 7529dedf603SShaohua Li if (min_pending > pending) { 7539dedf603SShaohua Li min_pending = pending; 7549dedf603SShaohua Li best_pending_disk = disk; 7559dedf603SShaohua Li } 7569dedf603SShaohua Li 75776073054SNeilBrown if (dist < best_dist) { 75876073054SNeilBrown best_dist = dist; 7599dedf603SShaohua Li best_dist_disk = disk; 7601da177e4SLinus Torvalds } 761f3ac8bf7SNeilBrown } 7621da177e4SLinus Torvalds 7639dedf603SShaohua Li /* 7649dedf603SShaohua Li * If all disks are rotational, choose the closest disk. If any disk is 7659dedf603SShaohua Li * non-rotational, choose the disk with less pending request even the 7669dedf603SShaohua Li * disk is rotational, which might/might not be optimal for raids with 7679dedf603SShaohua Li * mixed ratation/non-rotational disks depending on workload. 7689dedf603SShaohua Li */ 7699dedf603SShaohua Li if (best_disk == -1) { 7702e52d449SNeilBrown if (has_nonrot_disk || min_pending == 0) 7719dedf603SShaohua Li best_disk = best_pending_disk; 7729dedf603SShaohua Li else 7739dedf603SShaohua Li best_disk = best_dist_disk; 7749dedf603SShaohua Li } 7759dedf603SShaohua Li 77676073054SNeilBrown if (best_disk >= 0) { 77776073054SNeilBrown rdev = rcu_dereference(conf->mirrors[best_disk].rdev); 7788ddf9efeSNeilBrown if (!rdev) 7798ddf9efeSNeilBrown goto retry; 7808ddf9efeSNeilBrown atomic_inc(&rdev->nr_pending); 781d2eb35acSNeilBrown sectors = best_good_sectors; 78212cee5a8SShaohua Li 78312cee5a8SShaohua Li if (conf->mirrors[best_disk].next_seq_sect != this_sector) 78412cee5a8SShaohua Li conf->mirrors[best_disk].seq_start = this_sector; 78512cee5a8SShaohua Li 786be4d3280SShaohua Li conf->mirrors[best_disk].next_seq_sect = this_sector + sectors; 7871da177e4SLinus Torvalds } 7881da177e4SLinus Torvalds rcu_read_unlock(); 789d2eb35acSNeilBrown *max_sectors = sectors; 7901da177e4SLinus Torvalds 79176073054SNeilBrown return best_disk; 7921da177e4SLinus Torvalds } 7931da177e4SLinus Torvalds 794673ca68dSNeilBrown static void flush_bio_list(struct r1conf *conf, struct bio *bio) 795a35e63efSNeilBrown { 796673ca68dSNeilBrown /* flush any pending bitmap writes to disk before proceeding w/ I/O */ 797e64e4018SAndy Shevchenko md_bitmap_unplug(conf->mddev->bitmap); 79834db0cd6SNeilBrown wake_up(&conf->wait_barrier); 799a35e63efSNeilBrown 800a35e63efSNeilBrown while (bio) { /* submit pending writes */ 801a35e63efSNeilBrown struct bio *next = bio->bi_next; 802309dca30SChristoph Hellwig struct md_rdev *rdev = (void *)bio->bi_bdev; 803a35e63efSNeilBrown bio->bi_next = NULL; 80474d46992SChristoph Hellwig bio_set_dev(bio, rdev->bdev); 8055e2c7a36SNeilBrown if (test_bit(Faulty, &rdev->flags)) { 8066308d8e3SGuoqing Jiang bio_io_error(bio); 8075e2c7a36SNeilBrown } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) && 80870200574SChristoph Hellwig !bdev_max_discard_sectors(bio->bi_bdev))) 8092ff8cc2cSShaohua Li /* Just ignore it */ 8104246a0b6SChristoph Hellwig bio_endio(bio); 8112ff8cc2cSShaohua Li else 812ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 813a35e63efSNeilBrown bio = next; 8145fa4f8baSHannes Reinecke cond_resched(); 815a35e63efSNeilBrown } 816673ca68dSNeilBrown } 817673ca68dSNeilBrown 818673ca68dSNeilBrown static void flush_pending_writes(struct r1conf *conf) 819673ca68dSNeilBrown { 820673ca68dSNeilBrown /* Any writes that have been queued but are awaiting 821673ca68dSNeilBrown * bitmap updates get flushed here. 822673ca68dSNeilBrown */ 823673ca68dSNeilBrown spin_lock_irq(&conf->device_lock); 824673ca68dSNeilBrown 825673ca68dSNeilBrown if (conf->pending_bio_list.head) { 82618022a1bSShaohua Li struct blk_plug plug; 827673ca68dSNeilBrown struct bio *bio; 82818022a1bSShaohua Li 829673ca68dSNeilBrown bio = bio_list_get(&conf->pending_bio_list); 830673ca68dSNeilBrown spin_unlock_irq(&conf->device_lock); 831474beb57SNeilBrown 832474beb57SNeilBrown /* 833474beb57SNeilBrown * As this is called in a wait_event() loop (see freeze_array), 834474beb57SNeilBrown * current->state might be TASK_UNINTERRUPTIBLE which will 835474beb57SNeilBrown * cause a warning when we prepare to wait again. As it is 836474beb57SNeilBrown * rare that this path is taken, it is perfectly safe to force 837474beb57SNeilBrown * us to go around the wait_event() loop again, so the warning 838474beb57SNeilBrown * is a false-positive. Silence the warning by resetting 839474beb57SNeilBrown * thread state 840474beb57SNeilBrown */ 841474beb57SNeilBrown __set_current_state(TASK_RUNNING); 84218022a1bSShaohua Li blk_start_plug(&plug); 843673ca68dSNeilBrown flush_bio_list(conf, bio); 84418022a1bSShaohua Li blk_finish_plug(&plug); 845a35e63efSNeilBrown } else 846a35e63efSNeilBrown spin_unlock_irq(&conf->device_lock); 8477eaceaccSJens Axboe } 8487eaceaccSJens Axboe 84917999be4SNeilBrown /* Barriers.... 85017999be4SNeilBrown * Sometimes we need to suspend IO while we do something else, 85117999be4SNeilBrown * either some resync/recovery, or reconfigure the array. 85217999be4SNeilBrown * To do this we raise a 'barrier'. 85317999be4SNeilBrown * The 'barrier' is a counter that can be raised multiple times 85417999be4SNeilBrown * to count how many activities are happening which preclude 85517999be4SNeilBrown * normal IO. 85617999be4SNeilBrown * We can only raise the barrier if there is no pending IO. 85717999be4SNeilBrown * i.e. if nr_pending == 0. 85817999be4SNeilBrown * We choose only to raise the barrier if no-one is waiting for the 85917999be4SNeilBrown * barrier to go down. This means that as soon as an IO request 86017999be4SNeilBrown * is ready, no other operations which require a barrier will start 86117999be4SNeilBrown * until the IO request has had a chance. 86217999be4SNeilBrown * 86317999be4SNeilBrown * So: regular IO calls 'wait_barrier'. When that returns there 86417999be4SNeilBrown * is no backgroup IO happening, It must arrange to call 86517999be4SNeilBrown * allow_barrier when it has finished its IO. 86617999be4SNeilBrown * backgroup IO calls must call raise_barrier. Once that returns 86717999be4SNeilBrown * there is no normal IO happeing. It must arrange to call 86817999be4SNeilBrown * lower_barrier when the particular background IO completes. 8694675719dSHou Tao * 8704675719dSHou Tao * If resync/recovery is interrupted, returns -EINTR; 8714675719dSHou Tao * Otherwise, returns 0. 8721da177e4SLinus Torvalds */ 8734675719dSHou Tao static int raise_barrier(struct r1conf *conf, sector_t sector_nr) 8741da177e4SLinus Torvalds { 875fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 876fd76863eScolyli@suse.de 8771da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 8781da177e4SLinus Torvalds 87917999be4SNeilBrown /* Wait until no block IO is waiting */ 880824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 881824e47daScolyli@suse.de !atomic_read(&conf->nr_waiting[idx]), 882eed8c02eSLukas Czerner conf->resync_lock); 88317999be4SNeilBrown 88417999be4SNeilBrown /* block any new IO from starting */ 885824e47daScolyli@suse.de atomic_inc(&conf->barrier[idx]); 886824e47daScolyli@suse.de /* 887824e47daScolyli@suse.de * In raise_barrier() we firstly increase conf->barrier[idx] then 888824e47daScolyli@suse.de * check conf->nr_pending[idx]. In _wait_barrier() we firstly 889824e47daScolyli@suse.de * increase conf->nr_pending[idx] then check conf->barrier[idx]. 890824e47daScolyli@suse.de * A memory barrier here to make sure conf->nr_pending[idx] won't 891824e47daScolyli@suse.de * be fetched before conf->barrier[idx] is increased. Otherwise 892824e47daScolyli@suse.de * there will be a race between raise_barrier() and _wait_barrier(). 893824e47daScolyli@suse.de */ 894824e47daScolyli@suse.de smp_mb__after_atomic(); 89517999be4SNeilBrown 89679ef3a8aSmajianpeng /* For these conditions we must wait: 89779ef3a8aSmajianpeng * A: while the array is in frozen state 898fd76863eScolyli@suse.de * B: while conf->nr_pending[idx] is not 0, meaning regular I/O 899fd76863eScolyli@suse.de * existing in corresponding I/O barrier bucket. 900fd76863eScolyli@suse.de * C: while conf->barrier[idx] >= RESYNC_DEPTH, meaning reaches 901fd76863eScolyli@suse.de * max resync count which allowed on current I/O barrier bucket. 90279ef3a8aSmajianpeng */ 90317999be4SNeilBrown wait_event_lock_irq(conf->wait_barrier, 9048c242593SYufen Yu (!conf->array_frozen && 905824e47daScolyli@suse.de !atomic_read(&conf->nr_pending[idx]) && 9068c242593SYufen Yu atomic_read(&conf->barrier[idx]) < RESYNC_DEPTH) || 9078c242593SYufen Yu test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery), 908eed8c02eSLukas Czerner conf->resync_lock); 90917999be4SNeilBrown 9108c242593SYufen Yu if (test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) { 9118c242593SYufen Yu atomic_dec(&conf->barrier[idx]); 9128c242593SYufen Yu spin_unlock_irq(&conf->resync_lock); 9138c242593SYufen Yu wake_up(&conf->wait_barrier); 9148c242593SYufen Yu return -EINTR; 9158c242593SYufen Yu } 9168c242593SYufen Yu 91743ac9b84SXiao Ni atomic_inc(&conf->nr_sync_pending); 9181da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 9198c242593SYufen Yu 9208c242593SYufen Yu return 0; 9211da177e4SLinus Torvalds } 9221da177e4SLinus Torvalds 923fd76863eScolyli@suse.de static void lower_barrier(struct r1conf *conf, sector_t sector_nr) 92417999be4SNeilBrown { 925fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 926fd76863eScolyli@suse.de 927824e47daScolyli@suse.de BUG_ON(atomic_read(&conf->barrier[idx]) <= 0); 928fd76863eScolyli@suse.de 929824e47daScolyli@suse.de atomic_dec(&conf->barrier[idx]); 93043ac9b84SXiao Ni atomic_dec(&conf->nr_sync_pending); 93117999be4SNeilBrown wake_up(&conf->wait_barrier); 93217999be4SNeilBrown } 93317999be4SNeilBrown 9345aa70503SVishal Verma static bool _wait_barrier(struct r1conf *conf, int idx, bool nowait) 93517999be4SNeilBrown { 9365aa70503SVishal Verma bool ret = true; 9375aa70503SVishal Verma 938824e47daScolyli@suse.de /* 939824e47daScolyli@suse.de * We need to increase conf->nr_pending[idx] very early here, 940824e47daScolyli@suse.de * then raise_barrier() can be blocked when it waits for 941824e47daScolyli@suse.de * conf->nr_pending[idx] to be 0. Then we can avoid holding 942824e47daScolyli@suse.de * conf->resync_lock when there is no barrier raised in same 943824e47daScolyli@suse.de * barrier unit bucket. Also if the array is frozen, I/O 944824e47daScolyli@suse.de * should be blocked until array is unfrozen. 945824e47daScolyli@suse.de */ 946824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 947824e47daScolyli@suse.de /* 948824e47daScolyli@suse.de * In _wait_barrier() we firstly increase conf->nr_pending[idx], then 949824e47daScolyli@suse.de * check conf->barrier[idx]. In raise_barrier() we firstly increase 950824e47daScolyli@suse.de * conf->barrier[idx], then check conf->nr_pending[idx]. A memory 951824e47daScolyli@suse.de * barrier is necessary here to make sure conf->barrier[idx] won't be 952824e47daScolyli@suse.de * fetched before conf->nr_pending[idx] is increased. Otherwise there 953824e47daScolyli@suse.de * will be a race between _wait_barrier() and raise_barrier(). 954824e47daScolyli@suse.de */ 955824e47daScolyli@suse.de smp_mb__after_atomic(); 95679ef3a8aSmajianpeng 957824e47daScolyli@suse.de /* 958824e47daScolyli@suse.de * Don't worry about checking two atomic_t variables at same time 959824e47daScolyli@suse.de * here. If during we check conf->barrier[idx], the array is 960824e47daScolyli@suse.de * frozen (conf->array_frozen is 1), and chonf->barrier[idx] is 961824e47daScolyli@suse.de * 0, it is safe to return and make the I/O continue. Because the 962824e47daScolyli@suse.de * array is frozen, all I/O returned here will eventually complete 963824e47daScolyli@suse.de * or be queued, no race will happen. See code comment in 964824e47daScolyli@suse.de * frozen_array(). 965824e47daScolyli@suse.de */ 966824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen) && 967824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx])) 9685aa70503SVishal Verma return ret; 969824e47daScolyli@suse.de 970824e47daScolyli@suse.de /* 971824e47daScolyli@suse.de * After holding conf->resync_lock, conf->nr_pending[idx] 972824e47daScolyli@suse.de * should be decreased before waiting for barrier to drop. 973824e47daScolyli@suse.de * Otherwise, we may encounter a race condition because 974824e47daScolyli@suse.de * raise_barrer() might be waiting for conf->nr_pending[idx] 975824e47daScolyli@suse.de * to be 0 at same time. 976824e47daScolyli@suse.de */ 977824e47daScolyli@suse.de spin_lock_irq(&conf->resync_lock); 978824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 979824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 980824e47daScolyli@suse.de /* 981824e47daScolyli@suse.de * In case freeze_array() is waiting for 982824e47daScolyli@suse.de * get_unqueued_pending() == extra 983824e47daScolyli@suse.de */ 984824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 985824e47daScolyli@suse.de /* Wait for the barrier in same barrier unit bucket to drop. */ 9865aa70503SVishal Verma 9875aa70503SVishal Verma /* Return false when nowait flag is set */ 9885aa70503SVishal Verma if (nowait) { 9895aa70503SVishal Verma ret = false; 9905aa70503SVishal Verma } else { 991824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 992824e47daScolyli@suse.de !conf->array_frozen && 993824e47daScolyli@suse.de !atomic_read(&conf->barrier[idx]), 994824e47daScolyli@suse.de conf->resync_lock); 995824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 99679ef3a8aSmajianpeng } 99779ef3a8aSmajianpeng 9985aa70503SVishal Verma atomic_dec(&conf->nr_waiting[idx]); 9995aa70503SVishal Verma spin_unlock_irq(&conf->resync_lock); 10005aa70503SVishal Verma return ret; 10015aa70503SVishal Verma } 10025aa70503SVishal Verma 10035aa70503SVishal Verma static bool wait_read_barrier(struct r1conf *conf, sector_t sector_nr, bool nowait) 100479ef3a8aSmajianpeng { 1005fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 10065aa70503SVishal Verma bool ret = true; 100779ef3a8aSmajianpeng 1008824e47daScolyli@suse.de /* 1009824e47daScolyli@suse.de * Very similar to _wait_barrier(). The difference is, for read 1010824e47daScolyli@suse.de * I/O we don't need wait for sync I/O, but if the whole array 1011824e47daScolyli@suse.de * is frozen, the read I/O still has to wait until the array is 1012824e47daScolyli@suse.de * unfrozen. Since there is no ordering requirement with 1013824e47daScolyli@suse.de * conf->barrier[idx] here, memory barrier is unnecessary as well. 1014824e47daScolyli@suse.de */ 1015824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 1016824e47daScolyli@suse.de 1017824e47daScolyli@suse.de if (!READ_ONCE(conf->array_frozen)) 10185aa70503SVishal Verma return ret; 101917999be4SNeilBrown 102017999be4SNeilBrown spin_lock_irq(&conf->resync_lock); 1021824e47daScolyli@suse.de atomic_inc(&conf->nr_waiting[idx]); 1022824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 1023824e47daScolyli@suse.de /* 1024824e47daScolyli@suse.de * In case freeze_array() is waiting for 1025824e47daScolyli@suse.de * get_unqueued_pending() == extra 1026d6b42dcbSNeilBrown */ 102717999be4SNeilBrown wake_up(&conf->wait_barrier); 1028824e47daScolyli@suse.de /* Wait for array to be unfrozen */ 10295aa70503SVishal Verma 10305aa70503SVishal Verma /* Return false when nowait flag is set */ 10315aa70503SVishal Verma if (nowait) { 10325aa70503SVishal Verma /* Return false when nowait flag is set */ 10335aa70503SVishal Verma ret = false; 10345aa70503SVishal Verma } else { 1035824e47daScolyli@suse.de wait_event_lock_irq(conf->wait_barrier, 1036fd76863eScolyli@suse.de !conf->array_frozen, 10371da177e4SLinus Torvalds conf->resync_lock); 1038824e47daScolyli@suse.de atomic_inc(&conf->nr_pending[idx]); 103917999be4SNeilBrown } 104017999be4SNeilBrown 10415aa70503SVishal Verma atomic_dec(&conf->nr_waiting[idx]); 10425aa70503SVishal Verma spin_unlock_irq(&conf->resync_lock); 10435aa70503SVishal Verma return ret; 10445aa70503SVishal Verma } 10455aa70503SVishal Verma 10465aa70503SVishal Verma static bool wait_barrier(struct r1conf *conf, sector_t sector_nr, bool nowait) 1047fd76863eScolyli@suse.de { 1048fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1049fd76863eScolyli@suse.de 10505aa70503SVishal Verma return _wait_barrier(conf, idx, nowait); 1051fd76863eScolyli@suse.de } 1052fd76863eScolyli@suse.de 1053fd76863eScolyli@suse.de static void _allow_barrier(struct r1conf *conf, int idx) 105417999be4SNeilBrown { 1055824e47daScolyli@suse.de atomic_dec(&conf->nr_pending[idx]); 105617999be4SNeilBrown wake_up(&conf->wait_barrier); 105717999be4SNeilBrown } 105817999be4SNeilBrown 1059fd76863eScolyli@suse.de static void allow_barrier(struct r1conf *conf, sector_t sector_nr) 1060fd76863eScolyli@suse.de { 1061fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 1062fd76863eScolyli@suse.de 1063fd76863eScolyli@suse.de _allow_barrier(conf, idx); 1064fd76863eScolyli@suse.de } 1065fd76863eScolyli@suse.de 1066fd76863eScolyli@suse.de /* conf->resync_lock should be held */ 1067fd76863eScolyli@suse.de static int get_unqueued_pending(struct r1conf *conf) 1068fd76863eScolyli@suse.de { 1069fd76863eScolyli@suse.de int idx, ret; 1070fd76863eScolyli@suse.de 107143ac9b84SXiao Ni ret = atomic_read(&conf->nr_sync_pending); 107243ac9b84SXiao Ni for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) 1073824e47daScolyli@suse.de ret += atomic_read(&conf->nr_pending[idx]) - 1074824e47daScolyli@suse.de atomic_read(&conf->nr_queued[idx]); 1075fd76863eScolyli@suse.de 1076fd76863eScolyli@suse.de return ret; 107717999be4SNeilBrown } 107817999be4SNeilBrown 1079e2d59925SNeilBrown static void freeze_array(struct r1conf *conf, int extra) 1080ddaf22abSNeilBrown { 1081fd76863eScolyli@suse.de /* Stop sync I/O and normal I/O and wait for everything to 108211353b9dSZhilong Liu * go quiet. 1083fd76863eScolyli@suse.de * This is called in two situations: 1084fd76863eScolyli@suse.de * 1) management command handlers (reshape, remove disk, quiesce). 1085fd76863eScolyli@suse.de * 2) one normal I/O request failed. 1086fd76863eScolyli@suse.de 1087fd76863eScolyli@suse.de * After array_frozen is set to 1, new sync IO will be blocked at 1088fd76863eScolyli@suse.de * raise_barrier(), and new normal I/O will blocked at _wait_barrier() 1089fd76863eScolyli@suse.de * or wait_read_barrier(). The flying I/Os will either complete or be 1090fd76863eScolyli@suse.de * queued. When everything goes quite, there are only queued I/Os left. 1091fd76863eScolyli@suse.de 1092fd76863eScolyli@suse.de * Every flying I/O contributes to a conf->nr_pending[idx], idx is the 1093fd76863eScolyli@suse.de * barrier bucket index which this I/O request hits. When all sync and 1094fd76863eScolyli@suse.de * normal I/O are queued, sum of all conf->nr_pending[] will match sum 1095fd76863eScolyli@suse.de * of all conf->nr_queued[]. But normal I/O failure is an exception, 1096fd76863eScolyli@suse.de * in handle_read_error(), we may call freeze_array() before trying to 1097fd76863eScolyli@suse.de * fix the read error. In this case, the error read I/O is not queued, 1098fd76863eScolyli@suse.de * so get_unqueued_pending() == 1. 1099fd76863eScolyli@suse.de * 1100fd76863eScolyli@suse.de * Therefore before this function returns, we need to wait until 1101fd76863eScolyli@suse.de * get_unqueued_pendings(conf) gets equal to extra. For 1102fd76863eScolyli@suse.de * normal I/O context, extra is 1, in rested situations extra is 0. 1103ddaf22abSNeilBrown */ 1104ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1105b364e3d0Smajianpeng conf->array_frozen = 1; 1106578b54adSNeilBrown raid1_log(conf->mddev, "wait freeze"); 1107fd76863eScolyli@suse.de wait_event_lock_irq_cmd( 1108fd76863eScolyli@suse.de conf->wait_barrier, 1109fd76863eScolyli@suse.de get_unqueued_pending(conf) == extra, 1110ddaf22abSNeilBrown conf->resync_lock, 1111c3b328acSNeilBrown flush_pending_writes(conf)); 1112ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1113ddaf22abSNeilBrown } 1114e8096360SNeilBrown static void unfreeze_array(struct r1conf *conf) 1115ddaf22abSNeilBrown { 1116ddaf22abSNeilBrown /* reverse the effect of the freeze */ 1117ddaf22abSNeilBrown spin_lock_irq(&conf->resync_lock); 1118b364e3d0Smajianpeng conf->array_frozen = 0; 1119ddaf22abSNeilBrown spin_unlock_irq(&conf->resync_lock); 1120824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 1121ddaf22abSNeilBrown } 1122ddaf22abSNeilBrown 112316d56e2fSShaohua Li static void alloc_behind_master_bio(struct r1bio *r1_bio, 1124cb83efcfSNeilBrown struct bio *bio) 11254b6d287fSNeilBrown { 1126cb83efcfSNeilBrown int size = bio->bi_iter.bi_size; 1127841c1316SMing Lei unsigned vcnt = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; 1128841c1316SMing Lei int i = 0; 1129841c1316SMing Lei struct bio *behind_bio = NULL; 11304b6d287fSNeilBrown 1131609be106SChristoph Hellwig behind_bio = bio_alloc_bioset(NULL, vcnt, 0, GFP_NOIO, 1132609be106SChristoph Hellwig &r1_bio->mddev->bio_set); 1133841c1316SMing Lei if (!behind_bio) 113416d56e2fSShaohua Li return; 1135841c1316SMing Lei 113641743c1fSShaohua Li /* discard op, we don't support writezero/writesame yet */ 113716d56e2fSShaohua Li if (!bio_has_data(bio)) { 113816d56e2fSShaohua Li behind_bio->bi_iter.bi_size = size; 113941743c1fSShaohua Li goto skip_copy; 114016d56e2fSShaohua Li } 114141743c1fSShaohua Li 1142841c1316SMing Lei while (i < vcnt && size) { 1143841c1316SMing Lei struct page *page; 1144841c1316SMing Lei int len = min_t(int, PAGE_SIZE, size); 1145841c1316SMing Lei 1146841c1316SMing Lei page = alloc_page(GFP_NOIO); 1147841c1316SMing Lei if (unlikely(!page)) 1148841c1316SMing Lei goto free_pages; 1149841c1316SMing Lei 1150841c1316SMing Lei bio_add_page(behind_bio, page, len, 0); 1151841c1316SMing Lei 1152841c1316SMing Lei size -= len; 1153841c1316SMing Lei i++; 11544b6d287fSNeilBrown } 11554b6d287fSNeilBrown 1156cb83efcfSNeilBrown bio_copy_data(behind_bio, bio); 115741743c1fSShaohua Li skip_copy: 115856a64c17SLuis de Bethencourt r1_bio->behind_master_bio = behind_bio; 1159841c1316SMing Lei set_bit(R1BIO_BehindIO, &r1_bio->state); 1160841c1316SMing Lei 116116d56e2fSShaohua Li return; 1162841c1316SMing Lei 1163841c1316SMing Lei free_pages: 11644f024f37SKent Overstreet pr_debug("%dB behind alloc failed, doing sync I/O\n", 11654f024f37SKent Overstreet bio->bi_iter.bi_size); 1166841c1316SMing Lei bio_free_pages(behind_bio); 116716d56e2fSShaohua Li bio_put(behind_bio); 11684b6d287fSNeilBrown } 11694b6d287fSNeilBrown 1170f54a9d0eSNeilBrown static void raid1_unplug(struct blk_plug_cb *cb, bool from_schedule) 1171f54a9d0eSNeilBrown { 1172f54a9d0eSNeilBrown struct raid1_plug_cb *plug = container_of(cb, struct raid1_plug_cb, 1173f54a9d0eSNeilBrown cb); 1174f54a9d0eSNeilBrown struct mddev *mddev = plug->cb.data; 1175f54a9d0eSNeilBrown struct r1conf *conf = mddev->private; 1176f54a9d0eSNeilBrown struct bio *bio; 1177f54a9d0eSNeilBrown 1178874807a8SNeilBrown if (from_schedule || current->bio_list) { 1179f54a9d0eSNeilBrown spin_lock_irq(&conf->device_lock); 1180f54a9d0eSNeilBrown bio_list_merge(&conf->pending_bio_list, &plug->pending); 1181f54a9d0eSNeilBrown spin_unlock_irq(&conf->device_lock); 1182ee0b0244SNeilBrown wake_up(&conf->wait_barrier); 1183f54a9d0eSNeilBrown md_wakeup_thread(mddev->thread); 1184f54a9d0eSNeilBrown kfree(plug); 1185f54a9d0eSNeilBrown return; 1186f54a9d0eSNeilBrown } 1187f54a9d0eSNeilBrown 1188f54a9d0eSNeilBrown /* we aren't scheduling, so we can do the write-out directly. */ 1189f54a9d0eSNeilBrown bio = bio_list_get(&plug->pending); 1190673ca68dSNeilBrown flush_bio_list(conf, bio); 1191f54a9d0eSNeilBrown kfree(plug); 1192f54a9d0eSNeilBrown } 1193f54a9d0eSNeilBrown 1194689389a0SNeilBrown static void init_r1bio(struct r1bio *r1_bio, struct mddev *mddev, struct bio *bio) 1195689389a0SNeilBrown { 1196689389a0SNeilBrown r1_bio->master_bio = bio; 1197689389a0SNeilBrown r1_bio->sectors = bio_sectors(bio); 1198689389a0SNeilBrown r1_bio->state = 0; 1199689389a0SNeilBrown r1_bio->mddev = mddev; 1200689389a0SNeilBrown r1_bio->sector = bio->bi_iter.bi_sector; 1201689389a0SNeilBrown } 1202689389a0SNeilBrown 1203fd76863eScolyli@suse.de static inline struct r1bio * 1204689389a0SNeilBrown alloc_r1bio(struct mddev *mddev, struct bio *bio) 1205fd76863eScolyli@suse.de { 1206fd76863eScolyli@suse.de struct r1conf *conf = mddev->private; 1207fd76863eScolyli@suse.de struct r1bio *r1_bio; 1208fd76863eScolyli@suse.de 1209afeee514SKent Overstreet r1_bio = mempool_alloc(&conf->r1bio_pool, GFP_NOIO); 1210689389a0SNeilBrown /* Ensure no bio records IO_BLOCKED */ 1211689389a0SNeilBrown memset(r1_bio->bios, 0, conf->raid_disks * sizeof(r1_bio->bios[0])); 1212689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio); 1213fd76863eScolyli@suse.de return r1_bio; 1214fd76863eScolyli@suse.de } 1215fd76863eScolyli@suse.de 1216c230e7e5SNeilBrown static void raid1_read_request(struct mddev *mddev, struct bio *bio, 1217689389a0SNeilBrown int max_read_sectors, struct r1bio *r1_bio) 12181da177e4SLinus Torvalds { 1219e8096360SNeilBrown struct r1conf *conf = mddev->private; 12200eaf822cSJonathan Brassow struct raid1_info *mirror; 12211da177e4SLinus Torvalds struct bio *read_bio; 12223b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 12233c5e514dSBart Van Assche const enum req_op op = bio_op(bio); 12243c5e514dSBart Van Assche const blk_opf_t do_sync = bio->bi_opf & REQ_SYNC; 12251f68f0c4SNeilBrown int max_sectors; 1226d2eb35acSNeilBrown int rdisk; 12279b8ae7b9SGuoqing Jiang bool r1bio_existed = !!r1_bio; 1228689389a0SNeilBrown char b[BDEVNAME_SIZE]; 1229689389a0SNeilBrown 1230689389a0SNeilBrown /* 1231689389a0SNeilBrown * If r1_bio is set, we are blocking the raid1d thread 1232689389a0SNeilBrown * so there is a tiny risk of deadlock. So ask for 1233689389a0SNeilBrown * emergency memory if needed. 1234689389a0SNeilBrown */ 1235689389a0SNeilBrown gfp_t gfp = r1_bio ? (GFP_NOIO | __GFP_HIGH) : GFP_NOIO; 1236689389a0SNeilBrown 12379b8ae7b9SGuoqing Jiang if (r1bio_existed) { 1238689389a0SNeilBrown /* Need to get the block device name carefully */ 1239689389a0SNeilBrown struct md_rdev *rdev; 1240689389a0SNeilBrown rcu_read_lock(); 1241689389a0SNeilBrown rdev = rcu_dereference(conf->mirrors[r1_bio->read_disk].rdev); 1242689389a0SNeilBrown if (rdev) 1243900d156bSChristoph Hellwig snprintf(b, sizeof(b), "%pg", rdev->bdev); 1244689389a0SNeilBrown else 1245689389a0SNeilBrown strcpy(b, "???"); 1246689389a0SNeilBrown rcu_read_unlock(); 1247689389a0SNeilBrown } 1248d2eb35acSNeilBrown 1249fd76863eScolyli@suse.de /* 1250fd76863eScolyli@suse.de * Still need barrier for READ in case that whole 1251fd76863eScolyli@suse.de * array is frozen. 1252fd76863eScolyli@suse.de */ 12535aa70503SVishal Verma if (!wait_read_barrier(conf, bio->bi_iter.bi_sector, 12545aa70503SVishal Verma bio->bi_opf & REQ_NOWAIT)) { 12555aa70503SVishal Verma bio_wouldblock_error(bio); 12565aa70503SVishal Verma return; 12575aa70503SVishal Verma } 12583b046a97SRobert LeBlanc 1259689389a0SNeilBrown if (!r1_bio) 1260689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio); 1261689389a0SNeilBrown else 1262689389a0SNeilBrown init_r1bio(r1_bio, mddev, bio); 1263c230e7e5SNeilBrown r1_bio->sectors = max_read_sectors; 1264fd76863eScolyli@suse.de 1265fd76863eScolyli@suse.de /* 1266fd76863eScolyli@suse.de * make_request() can abort the operation when read-ahead is being 1267fd76863eScolyli@suse.de * used and no empty request is available. 1268fd76863eScolyli@suse.de */ 1269d2eb35acSNeilBrown rdisk = read_balance(conf, r1_bio, &max_sectors); 12701da177e4SLinus Torvalds 12711da177e4SLinus Torvalds if (rdisk < 0) { 12721da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 12739b8ae7b9SGuoqing Jiang if (r1bio_existed) { 1274689389a0SNeilBrown pr_crit_ratelimited("md/raid1:%s: %s: unrecoverable I/O read error for block %llu\n", 1275689389a0SNeilBrown mdname(mddev), 1276689389a0SNeilBrown b, 1277689389a0SNeilBrown (unsigned long long)r1_bio->sector); 1278689389a0SNeilBrown } 12791da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 12805a7bbad2SChristoph Hellwig return; 12811da177e4SLinus Torvalds } 12821da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 12831da177e4SLinus Torvalds 12849b8ae7b9SGuoqing Jiang if (r1bio_existed) 1285913cce5aSChristoph Hellwig pr_info_ratelimited("md/raid1:%s: redirecting sector %llu to other mirror: %pg\n", 1286689389a0SNeilBrown mdname(mddev), 1287689389a0SNeilBrown (unsigned long long)r1_bio->sector, 1288913cce5aSChristoph Hellwig mirror->rdev->bdev); 1289689389a0SNeilBrown 1290e555190dSNeilBrown if (test_bit(WriteMostly, &mirror->rdev->flags) && 1291e555190dSNeilBrown bitmap) { 12923b046a97SRobert LeBlanc /* 12933b046a97SRobert LeBlanc * Reading from a write-mostly device must take care not to 12943b046a97SRobert LeBlanc * over-take any writes that are 'behind' 1295e555190dSNeilBrown */ 1296578b54adSNeilBrown raid1_log(mddev, "wait behind writes"); 1297e555190dSNeilBrown wait_event(bitmap->behind_wait, 1298e555190dSNeilBrown atomic_read(&bitmap->behind_writes) == 0); 1299e555190dSNeilBrown } 1300c230e7e5SNeilBrown 1301c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1302c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1303afeee514SKent Overstreet gfp, &conf->bio_split); 1304c230e7e5SNeilBrown bio_chain(split, bio); 1305ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 1306c230e7e5SNeilBrown bio = split; 1307c230e7e5SNeilBrown r1_bio->master_bio = bio; 1308c230e7e5SNeilBrown r1_bio->sectors = max_sectors; 1309c230e7e5SNeilBrown } 1310c230e7e5SNeilBrown 13111da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 13121da177e4SLinus Torvalds 1313a0159832SGuoqing Jiang if (!r1bio_existed && blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) 1314a0159832SGuoqing Jiang r1_bio->start_time = bio_start_io_acct(bio); 1315a0159832SGuoqing Jiang 1316abfc426dSChristoph Hellwig read_bio = bio_alloc_clone(mirror->rdev->bdev, bio, gfp, 1317abfc426dSChristoph Hellwig &mddev->bio_set); 13181da177e4SLinus Torvalds 13191da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 13201da177e4SLinus Torvalds 13214f024f37SKent Overstreet read_bio->bi_iter.bi_sector = r1_bio->sector + 13224f024f37SKent Overstreet mirror->rdev->data_offset; 13231da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 1324796a5cf0SMike Christie bio_set_op_attrs(read_bio, op, do_sync); 13252e52d449SNeilBrown if (test_bit(FailFast, &mirror->rdev->flags) && 13262e52d449SNeilBrown test_bit(R1BIO_FailFast, &r1_bio->state)) 13272e52d449SNeilBrown read_bio->bi_opf |= MD_FAILFAST; 13281da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 13291da177e4SLinus Torvalds 1330109e3765SNeilBrown if (mddev->gendisk) 13311c02fca6SChristoph Hellwig trace_block_bio_remap(read_bio, disk_devt(mddev->gendisk), 13321c02fca6SChristoph Hellwig r1_bio->sector); 1333109e3765SNeilBrown 1334ed00aabdSChristoph Hellwig submit_bio_noacct(read_bio); 13351da177e4SLinus Torvalds } 13361da177e4SLinus Torvalds 1337c230e7e5SNeilBrown static void raid1_write_request(struct mddev *mddev, struct bio *bio, 1338c230e7e5SNeilBrown int max_write_sectors) 13393b046a97SRobert LeBlanc { 13403b046a97SRobert LeBlanc struct r1conf *conf = mddev->private; 1341fd76863eScolyli@suse.de struct r1bio *r1_bio; 13423b046a97SRobert LeBlanc int i, disks; 13433b046a97SRobert LeBlanc struct bitmap *bitmap = mddev->bitmap; 13443b046a97SRobert LeBlanc unsigned long flags; 13453b046a97SRobert LeBlanc struct md_rdev *blocked_rdev; 13463b046a97SRobert LeBlanc struct blk_plug_cb *cb; 13473b046a97SRobert LeBlanc struct raid1_plug_cb *plug = NULL; 13483b046a97SRobert LeBlanc int first_clone; 13493b046a97SRobert LeBlanc int max_sectors; 13506607cd31SGuoqing Jiang bool write_behind = false; 13513b046a97SRobert LeBlanc 1352b3143b9aSNeilBrown if (mddev_is_clustered(mddev) && 13533b046a97SRobert LeBlanc md_cluster_ops->area_resyncing(mddev, WRITE, 1354b3143b9aSNeilBrown bio->bi_iter.bi_sector, bio_end_sector(bio))) { 13553b046a97SRobert LeBlanc 13563b046a97SRobert LeBlanc DEFINE_WAIT(w); 13575aa70503SVishal Verma if (bio->bi_opf & REQ_NOWAIT) { 13585aa70503SVishal Verma bio_wouldblock_error(bio); 13595aa70503SVishal Verma return; 13605aa70503SVishal Verma } 13613b046a97SRobert LeBlanc for (;;) { 13623b046a97SRobert LeBlanc prepare_to_wait(&conf->wait_barrier, 1363ae89fd3dSMikulas Patocka &w, TASK_IDLE); 1364f81f7302SGuoqing Jiang if (!md_cluster_ops->area_resyncing(mddev, WRITE, 13653b046a97SRobert LeBlanc bio->bi_iter.bi_sector, 1366b3143b9aSNeilBrown bio_end_sector(bio))) 13673b046a97SRobert LeBlanc break; 13683b046a97SRobert LeBlanc schedule(); 13693b046a97SRobert LeBlanc } 13703b046a97SRobert LeBlanc finish_wait(&conf->wait_barrier, &w); 13713b046a97SRobert LeBlanc } 1372f81f7302SGuoqing Jiang 1373f81f7302SGuoqing Jiang /* 1374f81f7302SGuoqing Jiang * Register the new request and wait if the reconstruction 1375f81f7302SGuoqing Jiang * thread has put up a bar for new requests. 1376f81f7302SGuoqing Jiang * Continue immediately if no resync is active currently. 1377f81f7302SGuoqing Jiang */ 13785aa70503SVishal Verma if (!wait_barrier(conf, bio->bi_iter.bi_sector, 13795aa70503SVishal Verma bio->bi_opf & REQ_NOWAIT)) { 13805aa70503SVishal Verma bio_wouldblock_error(bio); 13815aa70503SVishal Verma return; 13825aa70503SVishal Verma } 1383fd76863eScolyli@suse.de 1384689389a0SNeilBrown r1_bio = alloc_r1bio(mddev, bio); 1385c230e7e5SNeilBrown r1_bio->sectors = max_write_sectors; 13863b046a97SRobert LeBlanc 13871f68f0c4SNeilBrown /* first select target devices under rcu_lock and 13881da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 13891da177e4SLinus Torvalds * bios[x] to bio 13901f68f0c4SNeilBrown * If there are known/acknowledged bad blocks on any device on 13911f68f0c4SNeilBrown * which we have seen a write error, we want to avoid writing those 13921f68f0c4SNeilBrown * blocks. 13931f68f0c4SNeilBrown * This potentially requires several writes to write around 13941f68f0c4SNeilBrown * the bad blocks. Each set of writes gets it's own r1bio 13951f68f0c4SNeilBrown * with a set of bios attached. 13961da177e4SLinus Torvalds */ 1397c3b328acSNeilBrown 13988f19ccb2SNeilBrown disks = conf->raid_disks * 2; 13996bfe0b49SDan Williams retry_write: 14006bfe0b49SDan Williams blocked_rdev = NULL; 14011da177e4SLinus Torvalds rcu_read_lock(); 14021f68f0c4SNeilBrown max_sectors = r1_bio->sectors; 14031da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 14043cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 14056607cd31SGuoqing Jiang 14066607cd31SGuoqing Jiang /* 14076607cd31SGuoqing Jiang * The write-behind io is only attempted on drives marked as 14086607cd31SGuoqing Jiang * write-mostly, which means we could allocate write behind 14096607cd31SGuoqing Jiang * bio later. 14106607cd31SGuoqing Jiang */ 14116607cd31SGuoqing Jiang if (rdev && test_bit(WriteMostly, &rdev->flags)) 14126607cd31SGuoqing Jiang write_behind = true; 14136607cd31SGuoqing Jiang 14146bfe0b49SDan Williams if (rdev && unlikely(test_bit(Blocked, &rdev->flags))) { 14156bfe0b49SDan Williams atomic_inc(&rdev->nr_pending); 14166bfe0b49SDan Williams blocked_rdev = rdev; 14176bfe0b49SDan Williams break; 14186bfe0b49SDan Williams } 14191da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 14208ae12666SKent Overstreet if (!rdev || test_bit(Faulty, &rdev->flags)) { 14218f19ccb2SNeilBrown if (i < conf->raid_disks) 14221f68f0c4SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 14231f68f0c4SNeilBrown continue; 1424964147d5SNeilBrown } 14251f68f0c4SNeilBrown 14261f68f0c4SNeilBrown atomic_inc(&rdev->nr_pending); 14271f68f0c4SNeilBrown if (test_bit(WriteErrorSeen, &rdev->flags)) { 14281f68f0c4SNeilBrown sector_t first_bad; 14291f68f0c4SNeilBrown int bad_sectors; 14301f68f0c4SNeilBrown int is_bad; 14311f68f0c4SNeilBrown 14323b046a97SRobert LeBlanc is_bad = is_badblock(rdev, r1_bio->sector, max_sectors, 14331f68f0c4SNeilBrown &first_bad, &bad_sectors); 14341f68f0c4SNeilBrown if (is_bad < 0) { 14351f68f0c4SNeilBrown /* mustn't write here until the bad block is 14361f68f0c4SNeilBrown * acknowledged*/ 14371f68f0c4SNeilBrown set_bit(BlockedBadBlocks, &rdev->flags); 14381f68f0c4SNeilBrown blocked_rdev = rdev; 14391f68f0c4SNeilBrown break; 14401f68f0c4SNeilBrown } 14411f68f0c4SNeilBrown if (is_bad && first_bad <= r1_bio->sector) { 14421f68f0c4SNeilBrown /* Cannot write here at all */ 14431f68f0c4SNeilBrown bad_sectors -= (r1_bio->sector - first_bad); 14441f68f0c4SNeilBrown if (bad_sectors < max_sectors) 14451f68f0c4SNeilBrown /* mustn't write more than bad_sectors 14461f68f0c4SNeilBrown * to other devices yet 14471f68f0c4SNeilBrown */ 14481f68f0c4SNeilBrown max_sectors = bad_sectors; 14491f68f0c4SNeilBrown rdev_dec_pending(rdev, mddev); 14501f68f0c4SNeilBrown /* We don't set R1BIO_Degraded as that 14511f68f0c4SNeilBrown * only applies if the disk is 14521f68f0c4SNeilBrown * missing, so it might be re-added, 14531f68f0c4SNeilBrown * and we want to know to recover this 14541f68f0c4SNeilBrown * chunk. 14551f68f0c4SNeilBrown * In this case the device is here, 14561f68f0c4SNeilBrown * and the fact that this chunk is not 14571f68f0c4SNeilBrown * in-sync is recorded in the bad 14581f68f0c4SNeilBrown * block log 14591f68f0c4SNeilBrown */ 14601f68f0c4SNeilBrown continue; 14611f68f0c4SNeilBrown } 14621f68f0c4SNeilBrown if (is_bad) { 14631f68f0c4SNeilBrown int good_sectors = first_bad - r1_bio->sector; 14641f68f0c4SNeilBrown if (good_sectors < max_sectors) 14651f68f0c4SNeilBrown max_sectors = good_sectors; 14661f68f0c4SNeilBrown } 14671f68f0c4SNeilBrown } 14681f68f0c4SNeilBrown r1_bio->bios[i] = bio; 14691da177e4SLinus Torvalds } 14701da177e4SLinus Torvalds rcu_read_unlock(); 14711da177e4SLinus Torvalds 14726bfe0b49SDan Williams if (unlikely(blocked_rdev)) { 14736bfe0b49SDan Williams /* Wait for this device to become unblocked */ 14746bfe0b49SDan Williams int j; 14756bfe0b49SDan Williams 14766bfe0b49SDan Williams for (j = 0; j < i; j++) 14776bfe0b49SDan Williams if (r1_bio->bios[j]) 14786bfe0b49SDan Williams rdev_dec_pending(conf->mirrors[j].rdev, mddev); 14791f68f0c4SNeilBrown r1_bio->state = 0; 1480fd76863eScolyli@suse.de allow_barrier(conf, bio->bi_iter.bi_sector); 14815aa70503SVishal Verma 14825aa70503SVishal Verma if (bio->bi_opf & REQ_NOWAIT) { 14835aa70503SVishal Verma bio_wouldblock_error(bio); 14845aa70503SVishal Verma return; 14855aa70503SVishal Verma } 1486578b54adSNeilBrown raid1_log(mddev, "wait rdev %d blocked", blocked_rdev->raid_disk); 14876bfe0b49SDan Williams md_wait_for_blocked_rdev(blocked_rdev, mddev); 14885aa70503SVishal Verma wait_barrier(conf, bio->bi_iter.bi_sector, false); 14896bfe0b49SDan Williams goto retry_write; 14906bfe0b49SDan Williams } 14916bfe0b49SDan Williams 14926607cd31SGuoqing Jiang /* 14936607cd31SGuoqing Jiang * When using a bitmap, we may call alloc_behind_master_bio below. 14946607cd31SGuoqing Jiang * alloc_behind_master_bio allocates a copy of the data payload a page 14956607cd31SGuoqing Jiang * at a time and thus needs a new bio that can fit the whole payload 14966607cd31SGuoqing Jiang * this bio in page sized chunks. 14976607cd31SGuoqing Jiang */ 14986607cd31SGuoqing Jiang if (write_behind && bitmap) 14996607cd31SGuoqing Jiang max_sectors = min_t(int, max_sectors, 15006607cd31SGuoqing Jiang BIO_MAX_VECS * (PAGE_SIZE >> 9)); 1501c230e7e5SNeilBrown if (max_sectors < bio_sectors(bio)) { 1502c230e7e5SNeilBrown struct bio *split = bio_split(bio, max_sectors, 1503afeee514SKent Overstreet GFP_NOIO, &conf->bio_split); 1504c230e7e5SNeilBrown bio_chain(split, bio); 1505ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 1506c230e7e5SNeilBrown bio = split; 1507c230e7e5SNeilBrown r1_bio->master_bio = bio; 15081f68f0c4SNeilBrown r1_bio->sectors = max_sectors; 1509191ea9b2SNeilBrown } 15104b6d287fSNeilBrown 1511a0159832SGuoqing Jiang if (blk_queue_io_stat(bio->bi_bdev->bd_disk->queue)) 1512a0159832SGuoqing Jiang r1_bio->start_time = bio_start_io_acct(bio); 15134e78064fSNeilBrown atomic_set(&r1_bio->remaining, 1); 15144b6d287fSNeilBrown atomic_set(&r1_bio->behind_remaining, 0); 1515191ea9b2SNeilBrown 15161f68f0c4SNeilBrown first_clone = 1; 1517d8c84c4fSMing Lei 15181da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 15198e58e327SMing Lei struct bio *mbio = NULL; 152069df9cfcSGuoqing Jiang struct md_rdev *rdev = conf->mirrors[i].rdev; 15211da177e4SLinus Torvalds if (!r1_bio->bios[i]) 15221da177e4SLinus Torvalds continue; 15231da177e4SLinus Torvalds 152446669e86SSong Liu if (first_clone) { 15251f68f0c4SNeilBrown /* do behind I/O ? 15261f68f0c4SNeilBrown * Not if there are too many, or cannot 15271f68f0c4SNeilBrown * allocate memory, or a reader on WriteMostly 15281f68f0c4SNeilBrown * is waiting for behind writes to flush */ 15291f68f0c4SNeilBrown if (bitmap && 153046669e86SSong Liu test_bit(WriteMostly, &rdev->flags) && 15311f68f0c4SNeilBrown (atomic_read(&bitmap->behind_writes) 15321f68f0c4SNeilBrown < mddev->bitmap_info.max_write_behind) && 15338e58e327SMing Lei !waitqueue_active(&bitmap->behind_wait)) { 153416d56e2fSShaohua Li alloc_behind_master_bio(r1_bio, bio); 15358e58e327SMing Lei } 15361da177e4SLinus Torvalds 1537e64e4018SAndy Shevchenko md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors, 1538e64e4018SAndy Shevchenko test_bit(R1BIO_BehindIO, &r1_bio->state)); 15391f68f0c4SNeilBrown first_clone = 0; 15401f68f0c4SNeilBrown } 15418e58e327SMing Lei 1542841c1316SMing Lei if (r1_bio->behind_master_bio) { 1543abfc426dSChristoph Hellwig mbio = bio_alloc_clone(rdev->bdev, 1544abfc426dSChristoph Hellwig r1_bio->behind_master_bio, 1545abfc426dSChristoph Hellwig GFP_NOIO, &mddev->bio_set); 154669df9cfcSGuoqing Jiang if (test_bit(CollisionCheck, &rdev->flags)) 1547d0d2d8baSGuoqing Jiang wait_for_serialization(rdev, r1_bio); 15483e148a32SGuoqing Jiang if (test_bit(WriteMostly, &rdev->flags)) 15494b6d287fSNeilBrown atomic_inc(&r1_bio->behind_remaining); 1550abfc426dSChristoph Hellwig } else { 1551abfc426dSChristoph Hellwig mbio = bio_alloc_clone(rdev->bdev, bio, GFP_NOIO, 1552abfc426dSChristoph Hellwig &mddev->bio_set); 1553abfc426dSChristoph Hellwig 1554abfc426dSChristoph Hellwig if (mddev->serialize_policy) 1555d0d2d8baSGuoqing Jiang wait_for_serialization(rdev, r1_bio); 1556abfc426dSChristoph Hellwig } 15574b6d287fSNeilBrown 15581f68f0c4SNeilBrown r1_bio->bios[i] = mbio; 15591f68f0c4SNeilBrown 15602e94275eSGuoqing Jiang mbio->bi_iter.bi_sector = (r1_bio->sector + rdev->data_offset); 15611f68f0c4SNeilBrown mbio->bi_end_io = raid1_end_write_request; 1562a682e003SLinus Torvalds mbio->bi_opf = bio_op(bio) | (bio->bi_opf & (REQ_SYNC | REQ_FUA)); 15632e94275eSGuoqing Jiang if (test_bit(FailFast, &rdev->flags) && 15642e94275eSGuoqing Jiang !test_bit(WriteMostly, &rdev->flags) && 1565212e7eb7SNeilBrown conf->raid_disks - mddev->degraded > 1) 1566212e7eb7SNeilBrown mbio->bi_opf |= MD_FAILFAST; 15671f68f0c4SNeilBrown mbio->bi_private = r1_bio; 15681f68f0c4SNeilBrown 15691da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 1570f54a9d0eSNeilBrown 1571109e3765SNeilBrown if (mddev->gendisk) 15721c02fca6SChristoph Hellwig trace_block_bio_remap(mbio, disk_devt(mddev->gendisk), 1573109e3765SNeilBrown r1_bio->sector); 1574109e3765SNeilBrown /* flush_pending_writes() needs access to the rdev so...*/ 15752e94275eSGuoqing Jiang mbio->bi_bdev = (void *)rdev; 1576109e3765SNeilBrown 1577f54a9d0eSNeilBrown cb = blk_check_plugged(raid1_unplug, mddev, sizeof(*plug)); 1578f54a9d0eSNeilBrown if (cb) 1579f54a9d0eSNeilBrown plug = container_of(cb, struct raid1_plug_cb, cb); 1580f54a9d0eSNeilBrown else 1581f54a9d0eSNeilBrown plug = NULL; 1582f54a9d0eSNeilBrown if (plug) { 1583f54a9d0eSNeilBrown bio_list_add(&plug->pending, mbio); 1584f54a9d0eSNeilBrown } else { 158523b245c0SShaohua Li spin_lock_irqsave(&conf->device_lock, flags); 15864e78064fSNeilBrown bio_list_add(&conf->pending_bio_list, mbio); 1587191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1588b357f04aSNeilBrown md_wakeup_thread(mddev->thread); 15894e78064fSNeilBrown } 159023b245c0SShaohua Li } 15911f68f0c4SNeilBrown 1592079fa166SNeilBrown r1_bio_write_done(r1_bio); 1593079fa166SNeilBrown 1594079fa166SNeilBrown /* In case raid1d snuck in to freeze_array */ 1595079fa166SNeilBrown wake_up(&conf->wait_barrier); 15961da177e4SLinus Torvalds } 15971da177e4SLinus Torvalds 1598cc27b0c7SNeilBrown static bool raid1_make_request(struct mddev *mddev, struct bio *bio) 15993b046a97SRobert LeBlanc { 1600fd76863eScolyli@suse.de sector_t sectors; 16013b046a97SRobert LeBlanc 1602775d7831SDavid Jeffery if (unlikely(bio->bi_opf & REQ_PREFLUSH) 1603775d7831SDavid Jeffery && md_flush_request(mddev, bio)) 1604cc27b0c7SNeilBrown return true; 16053b046a97SRobert LeBlanc 1606c230e7e5SNeilBrown /* 1607c230e7e5SNeilBrown * There is a limit to the maximum size, but 1608c230e7e5SNeilBrown * the read/write handler might find a lower limit 1609c230e7e5SNeilBrown * due to bad blocks. To avoid multiple splits, 1610c230e7e5SNeilBrown * we pass the maximum number of sectors down 1611c230e7e5SNeilBrown * and let the lower level perform the split. 1612c230e7e5SNeilBrown */ 1613fd76863eScolyli@suse.de sectors = align_to_barrier_unit_end( 1614fd76863eScolyli@suse.de bio->bi_iter.bi_sector, bio_sectors(bio)); 16153b046a97SRobert LeBlanc 1616c230e7e5SNeilBrown if (bio_data_dir(bio) == READ) 1617689389a0SNeilBrown raid1_read_request(mddev, bio, sectors, NULL); 1618cc27b0c7SNeilBrown else { 1619cc27b0c7SNeilBrown if (!md_write_start(mddev,bio)) 1620cc27b0c7SNeilBrown return false; 1621c230e7e5SNeilBrown raid1_write_request(mddev, bio, sectors); 16223b046a97SRobert LeBlanc } 1623cc27b0c7SNeilBrown return true; 1624cc27b0c7SNeilBrown } 16253b046a97SRobert LeBlanc 1626849674e4SShaohua Li static void raid1_status(struct seq_file *seq, struct mddev *mddev) 16271da177e4SLinus Torvalds { 1628e8096360SNeilBrown struct r1conf *conf = mddev->private; 16291da177e4SLinus Torvalds int i; 16301da177e4SLinus Torvalds 16311da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 163211ce99e6SNeilBrown conf->raid_disks - mddev->degraded); 1633ddac7c7eSNeilBrown rcu_read_lock(); 1634ddac7c7eSNeilBrown for (i = 0; i < conf->raid_disks; i++) { 16353cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 16361da177e4SLinus Torvalds seq_printf(seq, "%s", 1637ddac7c7eSNeilBrown rdev && test_bit(In_sync, &rdev->flags) ? "U" : "_"); 1638ddac7c7eSNeilBrown } 1639ddac7c7eSNeilBrown rcu_read_unlock(); 16401da177e4SLinus Torvalds seq_printf(seq, "]"); 16411da177e4SLinus Torvalds } 16421da177e4SLinus Torvalds 16439631abdbSMariusz Tkaczyk /** 16449631abdbSMariusz Tkaczyk * raid1_error() - RAID1 error handler. 16459631abdbSMariusz Tkaczyk * @mddev: affected md device. 16469631abdbSMariusz Tkaczyk * @rdev: member device to fail. 16479631abdbSMariusz Tkaczyk * 16489631abdbSMariusz Tkaczyk * The routine acknowledges &rdev failure and determines new @mddev state. 16499631abdbSMariusz Tkaczyk * If it failed, then: 16509631abdbSMariusz Tkaczyk * - &MD_BROKEN flag is set in &mddev->flags. 16519631abdbSMariusz Tkaczyk * - recovery is disabled. 16529631abdbSMariusz Tkaczyk * Otherwise, it must be degraded: 16539631abdbSMariusz Tkaczyk * - recovery is interrupted. 16549631abdbSMariusz Tkaczyk * - &mddev->degraded is bumped. 16559631abdbSMariusz Tkaczyk * 16569631abdbSMariusz Tkaczyk * @rdev is marked as &Faulty excluding case when array is failed and 16579631abdbSMariusz Tkaczyk * &mddev->fail_last_dev is off. 16589631abdbSMariusz Tkaczyk */ 1659849674e4SShaohua Li static void raid1_error(struct mddev *mddev, struct md_rdev *rdev) 16601da177e4SLinus Torvalds { 1661e8096360SNeilBrown struct r1conf *conf = mddev->private; 1662423f04d6SNeilBrown unsigned long flags; 16631da177e4SLinus Torvalds 16642e52d449SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 16659631abdbSMariusz Tkaczyk 16669631abdbSMariusz Tkaczyk if (test_bit(In_sync, &rdev->flags) && 16679631abdbSMariusz Tkaczyk (conf->raid_disks - mddev->degraded) == 1) { 16689631abdbSMariusz Tkaczyk set_bit(MD_BROKEN, &mddev->flags); 16699631abdbSMariusz Tkaczyk 16709631abdbSMariusz Tkaczyk if (!mddev->fail_last_dev) { 16715389042fSNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 16722e52d449SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16731da177e4SLinus Torvalds return; 16744044ba58SNeilBrown } 16759631abdbSMariusz Tkaczyk } 1676de393cdeSNeilBrown set_bit(Blocked, &rdev->flags); 1677ebda52faSYufen Yu if (test_and_clear_bit(In_sync, &rdev->flags)) 16781da177e4SLinus Torvalds mddev->degraded++; 1679dd00a99eSNeilBrown set_bit(Faulty, &rdev->flags); 1680423f04d6SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 16811da177e4SLinus Torvalds /* 16821da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 16831da177e4SLinus Torvalds */ 1684dfc70645SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 16852953079cSShaohua Li set_mask_bits(&mddev->sb_flags, 0, 16862953079cSShaohua Li BIT(MD_SB_CHANGE_DEVS) | BIT(MD_SB_CHANGE_PENDING)); 1687913cce5aSChristoph Hellwig pr_crit("md/raid1:%s: Disk failure on %pg, disabling device.\n" 1688067032bcSJoe Perches "md/raid1:%s: Operation continuing on %d devices.\n", 1689913cce5aSChristoph Hellwig mdname(mddev), rdev->bdev, 16909dd1e2faSNeilBrown mdname(mddev), conf->raid_disks - mddev->degraded); 16911da177e4SLinus Torvalds } 16921da177e4SLinus Torvalds 1693e8096360SNeilBrown static void print_conf(struct r1conf *conf) 16941da177e4SLinus Torvalds { 16951da177e4SLinus Torvalds int i; 16961da177e4SLinus Torvalds 16971d41c216SNeilBrown pr_debug("RAID1 conf printout:\n"); 16981da177e4SLinus Torvalds if (!conf) { 16991d41c216SNeilBrown pr_debug("(!conf)\n"); 17001da177e4SLinus Torvalds return; 17011da177e4SLinus Torvalds } 17021d41c216SNeilBrown pr_debug(" --- wd:%d rd:%d\n", conf->raid_disks - conf->mddev->degraded, 17031da177e4SLinus Torvalds conf->raid_disks); 17041da177e4SLinus Torvalds 1705ddac7c7eSNeilBrown rcu_read_lock(); 17061da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 17073cb03002SNeilBrown struct md_rdev *rdev = rcu_dereference(conf->mirrors[i].rdev); 1708ddac7c7eSNeilBrown if (rdev) 1709913cce5aSChristoph Hellwig pr_debug(" disk %d, wo:%d, o:%d, dev:%pg\n", 1710ddac7c7eSNeilBrown i, !test_bit(In_sync, &rdev->flags), 1711ddac7c7eSNeilBrown !test_bit(Faulty, &rdev->flags), 1712913cce5aSChristoph Hellwig rdev->bdev); 17131da177e4SLinus Torvalds } 1714ddac7c7eSNeilBrown rcu_read_unlock(); 17151da177e4SLinus Torvalds } 17161da177e4SLinus Torvalds 1717e8096360SNeilBrown static void close_sync(struct r1conf *conf) 17181da177e4SLinus Torvalds { 1719f6eca2d4SNate Dailey int idx; 1720f6eca2d4SNate Dailey 1721f6eca2d4SNate Dailey for (idx = 0; idx < BARRIER_BUCKETS_NR; idx++) { 17225aa70503SVishal Verma _wait_barrier(conf, idx, false); 1723f6eca2d4SNate Dailey _allow_barrier(conf, idx); 1724f6eca2d4SNate Dailey } 17251da177e4SLinus Torvalds 1726afeee514SKent Overstreet mempool_exit(&conf->r1buf_pool); 17271da177e4SLinus Torvalds } 17281da177e4SLinus Torvalds 1729fd01b88cSNeilBrown static int raid1_spare_active(struct mddev *mddev) 17301da177e4SLinus Torvalds { 17311da177e4SLinus Torvalds int i; 1732e8096360SNeilBrown struct r1conf *conf = mddev->private; 17336b965620SNeilBrown int count = 0; 17346b965620SNeilBrown unsigned long flags; 17351da177e4SLinus Torvalds 17361da177e4SLinus Torvalds /* 17371da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 1738ddac7c7eSNeilBrown * and mark them readable. 1739ddac7c7eSNeilBrown * Called under mddev lock, so rcu protection not needed. 1740423f04d6SNeilBrown * device_lock used to avoid races with raid1_end_read_request 1741423f04d6SNeilBrown * which expects 'In_sync' flags and ->degraded to be consistent. 17421da177e4SLinus Torvalds */ 1743423f04d6SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 17441da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 17453cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 17468c7a2c2bSNeilBrown struct md_rdev *repl = conf->mirrors[conf->raid_disks + i].rdev; 17478c7a2c2bSNeilBrown if (repl 17481aee41f6SGoldwyn Rodrigues && !test_bit(Candidate, &repl->flags) 17498c7a2c2bSNeilBrown && repl->recovery_offset == MaxSector 17508c7a2c2bSNeilBrown && !test_bit(Faulty, &repl->flags) 17518c7a2c2bSNeilBrown && !test_and_set_bit(In_sync, &repl->flags)) { 17528c7a2c2bSNeilBrown /* replacement has just become active */ 17538c7a2c2bSNeilBrown if (!rdev || 17548c7a2c2bSNeilBrown !test_and_clear_bit(In_sync, &rdev->flags)) 17558c7a2c2bSNeilBrown count++; 17568c7a2c2bSNeilBrown if (rdev) { 17578c7a2c2bSNeilBrown /* Replaced device not technically 17588c7a2c2bSNeilBrown * faulty, but we need to be sure 17598c7a2c2bSNeilBrown * it gets removed and never re-added 17608c7a2c2bSNeilBrown */ 17618c7a2c2bSNeilBrown set_bit(Faulty, &rdev->flags); 17628c7a2c2bSNeilBrown sysfs_notify_dirent_safe( 17638c7a2c2bSNeilBrown rdev->sysfs_state); 17648c7a2c2bSNeilBrown } 17658c7a2c2bSNeilBrown } 1766ddac7c7eSNeilBrown if (rdev 176761e4947cSLukasz Dorau && rdev->recovery_offset == MaxSector 1768ddac7c7eSNeilBrown && !test_bit(Faulty, &rdev->flags) 1769c04be0aaSNeilBrown && !test_and_set_bit(In_sync, &rdev->flags)) { 17706b965620SNeilBrown count++; 1771654e8b5aSJonathan Brassow sysfs_notify_dirent_safe(rdev->sysfs_state); 17721da177e4SLinus Torvalds } 17731da177e4SLinus Torvalds } 17746b965620SNeilBrown mddev->degraded -= count; 17756b965620SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 17761da177e4SLinus Torvalds 17771da177e4SLinus Torvalds print_conf(conf); 17786b965620SNeilBrown return count; 17791da177e4SLinus Torvalds } 17801da177e4SLinus Torvalds 1781fd01b88cSNeilBrown static int raid1_add_disk(struct mddev *mddev, struct md_rdev *rdev) 17821da177e4SLinus Torvalds { 1783e8096360SNeilBrown struct r1conf *conf = mddev->private; 1784199050eaSNeil Brown int err = -EEXIST; 178541158c7eSNeilBrown int mirror = 0; 17860eaf822cSJonathan Brassow struct raid1_info *p; 17876c2fce2eSNeil Brown int first = 0; 178830194636SNeilBrown int last = conf->raid_disks - 1; 17891da177e4SLinus Torvalds 17905389042fSNeilBrown if (mddev->recovery_disabled == conf->recovery_disabled) 17915389042fSNeilBrown return -EBUSY; 17925389042fSNeilBrown 17931501efadSDan Williams if (md_integrity_add_rdev(rdev, mddev)) 17941501efadSDan Williams return -ENXIO; 17951501efadSDan Williams 17966c2fce2eSNeil Brown if (rdev->raid_disk >= 0) 17976c2fce2eSNeil Brown first = last = rdev->raid_disk; 17986c2fce2eSNeil Brown 179970bcecdbSGoldwyn Rodrigues /* 180070bcecdbSGoldwyn Rodrigues * find the disk ... but prefer rdev->saved_raid_disk 180170bcecdbSGoldwyn Rodrigues * if possible. 180270bcecdbSGoldwyn Rodrigues */ 180370bcecdbSGoldwyn Rodrigues if (rdev->saved_raid_disk >= 0 && 180470bcecdbSGoldwyn Rodrigues rdev->saved_raid_disk >= first && 18059e753ba9SShaohua Li rdev->saved_raid_disk < conf->raid_disks && 180670bcecdbSGoldwyn Rodrigues conf->mirrors[rdev->saved_raid_disk].rdev == NULL) 180770bcecdbSGoldwyn Rodrigues first = last = rdev->saved_raid_disk; 180870bcecdbSGoldwyn Rodrigues 18097ef449d1SNeilBrown for (mirror = first; mirror <= last; mirror++) { 18107ef449d1SNeilBrown p = conf->mirrors + mirror; 18117ef449d1SNeilBrown if (!p->rdev) { 18129092c02dSJonathan Brassow if (mddev->gendisk) 18138f6c2e4bSMartin K. Petersen disk_stack_limits(mddev->gendisk, rdev->bdev, 18148f6c2e4bSMartin K. Petersen rdev->data_offset << 9); 18151da177e4SLinus Torvalds 18161da177e4SLinus Torvalds p->head_position = 0; 18171da177e4SLinus Torvalds rdev->raid_disk = mirror; 1818199050eaSNeil Brown err = 0; 18196aea114aSNeilBrown /* As all devices are equivalent, we don't need a full recovery 18206aea114aSNeilBrown * if this was recently any drive of the array 18216aea114aSNeilBrown */ 18226aea114aSNeilBrown if (rdev->saved_raid_disk < 0) 182341158c7eSNeilBrown conf->fullsync = 1; 1824d6065f7bSSuzanne Wood rcu_assign_pointer(p->rdev, rdev); 18251da177e4SLinus Torvalds break; 18261da177e4SLinus Torvalds } 18277ef449d1SNeilBrown if (test_bit(WantReplacement, &p->rdev->flags) && 18287ef449d1SNeilBrown p[conf->raid_disks].rdev == NULL) { 18297ef449d1SNeilBrown /* Add this device as a replacement */ 18307ef449d1SNeilBrown clear_bit(In_sync, &rdev->flags); 18317ef449d1SNeilBrown set_bit(Replacement, &rdev->flags); 18327ef449d1SNeilBrown rdev->raid_disk = mirror; 18337ef449d1SNeilBrown err = 0; 18347ef449d1SNeilBrown conf->fullsync = 1; 18357ef449d1SNeilBrown rcu_assign_pointer(p[conf->raid_disks].rdev, rdev); 18367ef449d1SNeilBrown break; 18377ef449d1SNeilBrown } 18387ef449d1SNeilBrown } 18391da177e4SLinus Torvalds print_conf(conf); 1840199050eaSNeil Brown return err; 18411da177e4SLinus Torvalds } 18421da177e4SLinus Torvalds 1843b8321b68SNeilBrown static int raid1_remove_disk(struct mddev *mddev, struct md_rdev *rdev) 18441da177e4SLinus Torvalds { 1845e8096360SNeilBrown struct r1conf *conf = mddev->private; 18461da177e4SLinus Torvalds int err = 0; 1847b8321b68SNeilBrown int number = rdev->raid_disk; 18480eaf822cSJonathan Brassow struct raid1_info *p = conf->mirrors + number; 18491da177e4SLinus Torvalds 1850b014f14cSNeilBrown if (rdev != p->rdev) 1851b014f14cSNeilBrown p = conf->mirrors + conf->raid_disks + number; 1852b014f14cSNeilBrown 18531da177e4SLinus Torvalds print_conf(conf); 1854b8321b68SNeilBrown if (rdev == p->rdev) { 1855b2d444d7SNeilBrown if (test_bit(In_sync, &rdev->flags) || 18561da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 18571da177e4SLinus Torvalds err = -EBUSY; 18581da177e4SLinus Torvalds goto abort; 18591da177e4SLinus Torvalds } 1860046abeedSNeilBrown /* Only remove non-faulty devices if recovery 1861dfc70645SNeilBrown * is not possible. 1862dfc70645SNeilBrown */ 1863dfc70645SNeilBrown if (!test_bit(Faulty, &rdev->flags) && 18645389042fSNeilBrown mddev->recovery_disabled != conf->recovery_disabled && 1865dfc70645SNeilBrown mddev->degraded < conf->raid_disks) { 1866dfc70645SNeilBrown err = -EBUSY; 1867dfc70645SNeilBrown goto abort; 1868dfc70645SNeilBrown } 18691da177e4SLinus Torvalds p->rdev = NULL; 1870d787be40SNeilBrown if (!test_bit(RemoveSynchronized, &rdev->flags)) { 1871fbd568a3SPaul E. McKenney synchronize_rcu(); 18721da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 18731da177e4SLinus Torvalds /* lost the race, try later */ 18741da177e4SLinus Torvalds err = -EBUSY; 18751da177e4SLinus Torvalds p->rdev = rdev; 1876ac5e7113SAndre Noll goto abort; 1877d787be40SNeilBrown } 1878d787be40SNeilBrown } 1879d787be40SNeilBrown if (conf->mirrors[conf->raid_disks + number].rdev) { 18808c7a2c2bSNeilBrown /* We just removed a device that is being replaced. 18818c7a2c2bSNeilBrown * Move down the replacement. We drain all IO before 18828c7a2c2bSNeilBrown * doing this to avoid confusion. 18838c7a2c2bSNeilBrown */ 18848c7a2c2bSNeilBrown struct md_rdev *repl = 18858c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev; 1886e2d59925SNeilBrown freeze_array(conf, 0); 18873de59bb9SYufen Yu if (atomic_read(&repl->nr_pending)) { 18883de59bb9SYufen Yu /* It means that some queued IO of retry_list 18893de59bb9SYufen Yu * hold repl. Thus, we cannot set replacement 18903de59bb9SYufen Yu * as NULL, avoiding rdev NULL pointer 18913de59bb9SYufen Yu * dereference in sync_request_write and 18923de59bb9SYufen Yu * handle_write_finished. 18933de59bb9SYufen Yu */ 18943de59bb9SYufen Yu err = -EBUSY; 18953de59bb9SYufen Yu unfreeze_array(conf); 18963de59bb9SYufen Yu goto abort; 18973de59bb9SYufen Yu } 18988c7a2c2bSNeilBrown clear_bit(Replacement, &repl->flags); 18998c7a2c2bSNeilBrown p->rdev = repl; 19008c7a2c2bSNeilBrown conf->mirrors[conf->raid_disks + number].rdev = NULL; 1901e2d59925SNeilBrown unfreeze_array(conf); 1902e5bc9c3cSGuoqing Jiang } 1903e5bc9c3cSGuoqing Jiang 19048c7a2c2bSNeilBrown clear_bit(WantReplacement, &rdev->flags); 1905a91a2785SMartin K. Petersen err = md_integrity_register(mddev); 19061da177e4SLinus Torvalds } 19071da177e4SLinus Torvalds abort: 19081da177e4SLinus Torvalds 19091da177e4SLinus Torvalds print_conf(conf); 19101da177e4SLinus Torvalds return err; 19111da177e4SLinus Torvalds } 19121da177e4SLinus Torvalds 19134246a0b6SChristoph Hellwig static void end_sync_read(struct bio *bio) 19141da177e4SLinus Torvalds { 191598d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 19161da177e4SLinus Torvalds 19170fc280f6SNeilBrown update_head_pos(r1_bio->read_disk, r1_bio); 1918ba3ae3beSNamhyung Kim 19191da177e4SLinus Torvalds /* 19201da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 19211da177e4SLinus Torvalds * or re-read if the read failed. 19221da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 19231da177e4SLinus Torvalds */ 19244e4cbee9SChristoph Hellwig if (!bio->bi_status) 19251da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 1926d11c171eSNeilBrown 1927d11c171eSNeilBrown if (atomic_dec_and_test(&r1_bio->remaining)) 19281da177e4SLinus Torvalds reschedule_retry(r1_bio); 19291da177e4SLinus Torvalds } 19301da177e4SLinus Torvalds 1931dfcc34c9SNate Dailey static void abort_sync_write(struct mddev *mddev, struct r1bio *r1_bio) 1932dfcc34c9SNate Dailey { 1933dfcc34c9SNate Dailey sector_t sync_blocks = 0; 1934dfcc34c9SNate Dailey sector_t s = r1_bio->sector; 1935dfcc34c9SNate Dailey long sectors_to_go = r1_bio->sectors; 1936dfcc34c9SNate Dailey 1937dfcc34c9SNate Dailey /* make sure these bits don't get cleared. */ 1938dfcc34c9SNate Dailey do { 1939dfcc34c9SNate Dailey md_bitmap_end_sync(mddev->bitmap, s, &sync_blocks, 1); 1940dfcc34c9SNate Dailey s += sync_blocks; 1941dfcc34c9SNate Dailey sectors_to_go -= sync_blocks; 1942dfcc34c9SNate Dailey } while (sectors_to_go > 0); 1943dfcc34c9SNate Dailey } 1944dfcc34c9SNate Dailey 1945449808a2SHou Tao static void put_sync_write_buf(struct r1bio *r1_bio, int uptodate) 1946449808a2SHou Tao { 1947449808a2SHou Tao if (atomic_dec_and_test(&r1_bio->remaining)) { 1948449808a2SHou Tao struct mddev *mddev = r1_bio->mddev; 1949449808a2SHou Tao int s = r1_bio->sectors; 1950449808a2SHou Tao 1951449808a2SHou Tao if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 1952449808a2SHou Tao test_bit(R1BIO_WriteError, &r1_bio->state)) 1953449808a2SHou Tao reschedule_retry(r1_bio); 1954449808a2SHou Tao else { 1955449808a2SHou Tao put_buf(r1_bio); 1956449808a2SHou Tao md_done_sync(mddev, s, uptodate); 1957449808a2SHou Tao } 1958449808a2SHou Tao } 1959449808a2SHou Tao } 1960449808a2SHou Tao 19614246a0b6SChristoph Hellwig static void end_sync_write(struct bio *bio) 19621da177e4SLinus Torvalds { 19634e4cbee9SChristoph Hellwig int uptodate = !bio->bi_status; 196498d30c58SMing Lei struct r1bio *r1_bio = get_resync_r1bio(bio); 1965fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 1966e8096360SNeilBrown struct r1conf *conf = mddev->private; 19674367af55SNeilBrown sector_t first_bad; 19684367af55SNeilBrown int bad_sectors; 1969854abd75SNeilBrown struct md_rdev *rdev = conf->mirrors[find_bio_disk(r1_bio, bio)].rdev; 1970ba3ae3beSNamhyung Kim 19716b1117d5SNeilBrown if (!uptodate) { 1972dfcc34c9SNate Dailey abort_sync_write(mddev, r1_bio); 1973854abd75SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 1974854abd75SNeilBrown if (!test_and_set_bit(WantReplacement, &rdev->flags)) 197519d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 197619d67169SNeilBrown mddev->recovery); 1977d8f05d29SNeilBrown set_bit(R1BIO_WriteError, &r1_bio->state); 1978854abd75SNeilBrown } else if (is_badblock(rdev, r1_bio->sector, r1_bio->sectors, 19793a9f28a5SNeilBrown &first_bad, &bad_sectors) && 19803a9f28a5SNeilBrown !is_badblock(conf->mirrors[r1_bio->read_disk].rdev, 19813a9f28a5SNeilBrown r1_bio->sector, 19823a9f28a5SNeilBrown r1_bio->sectors, 19833a9f28a5SNeilBrown &first_bad, &bad_sectors) 19843a9f28a5SNeilBrown ) 19854367af55SNeilBrown set_bit(R1BIO_MadeGood, &r1_bio->state); 1986e3b9703eSNeilBrown 1987449808a2SHou Tao put_sync_write_buf(r1_bio, uptodate); 19884367af55SNeilBrown } 19891da177e4SLinus Torvalds 19903cb03002SNeilBrown static int r1_sync_page_io(struct md_rdev *rdev, sector_t sector, 1991d8f05d29SNeilBrown int sectors, struct page *page, int rw) 1992d8f05d29SNeilBrown { 19934ce4c73fSBart Van Assche if (sync_page_io(rdev, sector, sectors << 9, page, rw, false)) 1994d8f05d29SNeilBrown /* success */ 1995d8f05d29SNeilBrown return 1; 199619d67169SNeilBrown if (rw == WRITE) { 1997d8f05d29SNeilBrown set_bit(WriteErrorSeen, &rdev->flags); 199819d67169SNeilBrown if (!test_and_set_bit(WantReplacement, 199919d67169SNeilBrown &rdev->flags)) 200019d67169SNeilBrown set_bit(MD_RECOVERY_NEEDED, & 200119d67169SNeilBrown rdev->mddev->recovery); 200219d67169SNeilBrown } 2003d8f05d29SNeilBrown /* need to record an error - either for the block or the device */ 2004d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sector, sectors, 0)) 2005d8f05d29SNeilBrown md_error(rdev->mddev, rdev); 2006d8f05d29SNeilBrown return 0; 2007d8f05d29SNeilBrown } 2008d8f05d29SNeilBrown 20099f2c9d12SNeilBrown static int fix_sync_read_error(struct r1bio *r1_bio) 20101da177e4SLinus Torvalds { 2011a68e5870SNeilBrown /* Try some synchronous reads of other devices to get 201269382e85SNeilBrown * good data, much like with normal read errors. Only 2013ddac7c7eSNeilBrown * read into the pages we already have so we don't 201469382e85SNeilBrown * need to re-issue the read request. 201569382e85SNeilBrown * We don't need to freeze the array, because being in an 201669382e85SNeilBrown * active sync request, there is no normal IO, and 201769382e85SNeilBrown * no overlapping syncs. 201806f60385SNeilBrown * We don't need to check is_badblock() again as we 201906f60385SNeilBrown * made sure that anything with a bad block in range 202006f60385SNeilBrown * will have bi_end_io clear. 20211da177e4SLinus Torvalds */ 2022fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2023e8096360SNeilBrown struct r1conf *conf = mddev->private; 2024a68e5870SNeilBrown struct bio *bio = r1_bio->bios[r1_bio->read_disk]; 202544cf0f4dSMing Lei struct page **pages = get_resync_pages(bio)->pages; 202669382e85SNeilBrown sector_t sect = r1_bio->sector; 202769382e85SNeilBrown int sectors = r1_bio->sectors; 202869382e85SNeilBrown int idx = 0; 20292e52d449SNeilBrown struct md_rdev *rdev; 20302e52d449SNeilBrown 20312e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 20322e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) { 20332e52d449SNeilBrown /* Don't try recovering from here - just fail it 20342e52d449SNeilBrown * ... unless it is the last working device of course */ 20352e52d449SNeilBrown md_error(mddev, rdev); 20362e52d449SNeilBrown if (test_bit(Faulty, &rdev->flags)) 20372e52d449SNeilBrown /* Don't try to read from here, but make sure 20382e52d449SNeilBrown * put_buf does it's thing 20392e52d449SNeilBrown */ 20402e52d449SNeilBrown bio->bi_end_io = end_sync_write; 20412e52d449SNeilBrown } 204269382e85SNeilBrown 204369382e85SNeilBrown while(sectors) { 204469382e85SNeilBrown int s = sectors; 204569382e85SNeilBrown int d = r1_bio->read_disk; 204669382e85SNeilBrown int success = 0; 204778d7f5f7SNeilBrown int start; 204869382e85SNeilBrown 204969382e85SNeilBrown if (s > (PAGE_SIZE>>9)) 205069382e85SNeilBrown s = PAGE_SIZE >> 9; 205169382e85SNeilBrown do { 205269382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io == end_sync_read) { 2053ddac7c7eSNeilBrown /* No rcu protection needed here devices 2054ddac7c7eSNeilBrown * can only be removed when no resync is 2055ddac7c7eSNeilBrown * active, and resync is currently active 2056ddac7c7eSNeilBrown */ 205769382e85SNeilBrown rdev = conf->mirrors[d].rdev; 20589d3d8011SNamhyung Kim if (sync_page_io(rdev, sect, s<<9, 205944cf0f4dSMing Lei pages[idx], 20604ce4c73fSBart Van Assche REQ_OP_READ, false)) { 206169382e85SNeilBrown success = 1; 206269382e85SNeilBrown break; 206369382e85SNeilBrown } 206469382e85SNeilBrown } 206569382e85SNeilBrown d++; 20668f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 206769382e85SNeilBrown d = 0; 206869382e85SNeilBrown } while (!success && d != r1_bio->read_disk); 206969382e85SNeilBrown 207078d7f5f7SNeilBrown if (!success) { 20713a9f28a5SNeilBrown int abort = 0; 20723a9f28a5SNeilBrown /* Cannot read from anywhere, this block is lost. 20733a9f28a5SNeilBrown * Record a bad block on each device. If that doesn't 20743a9f28a5SNeilBrown * work just disable and interrupt the recovery. 20753a9f28a5SNeilBrown * Don't fail devices as that won't really help. 20763a9f28a5SNeilBrown */ 2077ac483eb3SChristoph Hellwig pr_crit_ratelimited("md/raid1:%s: %pg: unrecoverable I/O read error for block %llu\n", 2078ac483eb3SChristoph Hellwig mdname(mddev), bio->bi_bdev, 207978d7f5f7SNeilBrown (unsigned long long)r1_bio->sector); 20808f19ccb2SNeilBrown for (d = 0; d < conf->raid_disks * 2; d++) { 20813a9f28a5SNeilBrown rdev = conf->mirrors[d].rdev; 20823a9f28a5SNeilBrown if (!rdev || test_bit(Faulty, &rdev->flags)) 20833a9f28a5SNeilBrown continue; 20843a9f28a5SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 20853a9f28a5SNeilBrown abort = 1; 20863a9f28a5SNeilBrown } 20873a9f28a5SNeilBrown if (abort) { 2088d890fa2bSNeilBrown conf->recovery_disabled = 2089d890fa2bSNeilBrown mddev->recovery_disabled; 20903a9f28a5SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 209178d7f5f7SNeilBrown md_done_sync(mddev, r1_bio->sectors, 0); 209278d7f5f7SNeilBrown put_buf(r1_bio); 209378d7f5f7SNeilBrown return 0; 209478d7f5f7SNeilBrown } 20953a9f28a5SNeilBrown /* Try next page */ 20963a9f28a5SNeilBrown sectors -= s; 20973a9f28a5SNeilBrown sect += s; 20983a9f28a5SNeilBrown idx++; 20993a9f28a5SNeilBrown continue; 21003a9f28a5SNeilBrown } 210178d7f5f7SNeilBrown 210278d7f5f7SNeilBrown start = d; 210369382e85SNeilBrown /* write it back and re-read */ 210469382e85SNeilBrown while (d != r1_bio->read_disk) { 210569382e85SNeilBrown if (d == 0) 21068f19ccb2SNeilBrown d = conf->raid_disks * 2; 210769382e85SNeilBrown d--; 210869382e85SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 210969382e85SNeilBrown continue; 211069382e85SNeilBrown rdev = conf->mirrors[d].rdev; 2111d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 211244cf0f4dSMing Lei pages[idx], 2113d8f05d29SNeilBrown WRITE) == 0) { 211478d7f5f7SNeilBrown r1_bio->bios[d]->bi_end_io = NULL; 211578d7f5f7SNeilBrown rdev_dec_pending(rdev, mddev); 21169d3d8011SNamhyung Kim } 2117097426f6SNeilBrown } 2118097426f6SNeilBrown d = start; 2119097426f6SNeilBrown while (d != r1_bio->read_disk) { 2120097426f6SNeilBrown if (d == 0) 21218f19ccb2SNeilBrown d = conf->raid_disks * 2; 2122097426f6SNeilBrown d--; 2123097426f6SNeilBrown if (r1_bio->bios[d]->bi_end_io != end_sync_read) 2124097426f6SNeilBrown continue; 2125097426f6SNeilBrown rdev = conf->mirrors[d].rdev; 2126d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 212744cf0f4dSMing Lei pages[idx], 2128d8f05d29SNeilBrown READ) != 0) 21299d3d8011SNamhyung Kim atomic_add(s, &rdev->corrected_errors); 213069382e85SNeilBrown } 213169382e85SNeilBrown sectors -= s; 213269382e85SNeilBrown sect += s; 213369382e85SNeilBrown idx ++; 213469382e85SNeilBrown } 213578d7f5f7SNeilBrown set_bit(R1BIO_Uptodate, &r1_bio->state); 21364e4cbee9SChristoph Hellwig bio->bi_status = 0; 2137a68e5870SNeilBrown return 1; 213869382e85SNeilBrown } 2139d11c171eSNeilBrown 2140c95e6385SNeilBrown static void process_checks(struct r1bio *r1_bio) 2141a68e5870SNeilBrown { 2142a68e5870SNeilBrown /* We have read all readable devices. If we haven't 2143a68e5870SNeilBrown * got the block, then there is no hope left. 2144a68e5870SNeilBrown * If we have, then we want to do a comparison 2145a68e5870SNeilBrown * and skip the write if everything is the same. 2146a68e5870SNeilBrown * If any blocks failed to read, then we need to 2147a68e5870SNeilBrown * attempt an over-write 2148a68e5870SNeilBrown */ 2149fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2150e8096360SNeilBrown struct r1conf *conf = mddev->private; 2151a68e5870SNeilBrown int primary; 2152a68e5870SNeilBrown int i; 2153f4380a91Smajianpeng int vcnt; 2154a68e5870SNeilBrown 215530bc9b53SNeilBrown /* Fix variable parts of all bios */ 215630bc9b53SNeilBrown vcnt = (r1_bio->sectors + PAGE_SIZE / 512 - 1) >> (PAGE_SHIFT - 9); 215730bc9b53SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 21584e4cbee9SChristoph Hellwig blk_status_t status; 215930bc9b53SNeilBrown struct bio *b = r1_bio->bios[i]; 216098d30c58SMing Lei struct resync_pages *rp = get_resync_pages(b); 216130bc9b53SNeilBrown if (b->bi_end_io != end_sync_read) 216230bc9b53SNeilBrown continue; 21634246a0b6SChristoph Hellwig /* fixup the bio for reuse, but preserve errno */ 21644e4cbee9SChristoph Hellwig status = b->bi_status; 2165a7c50c94SChristoph Hellwig bio_reset(b, conf->mirrors[i].rdev->bdev, REQ_OP_READ); 21664e4cbee9SChristoph Hellwig b->bi_status = status; 21674f024f37SKent Overstreet b->bi_iter.bi_sector = r1_bio->sector + 216830bc9b53SNeilBrown conf->mirrors[i].rdev->data_offset; 216930bc9b53SNeilBrown b->bi_end_io = end_sync_read; 217098d30c58SMing Lei rp->raid_bio = r1_bio; 217198d30c58SMing Lei b->bi_private = rp; 217230bc9b53SNeilBrown 2173fb0eb5dfSMing Lei /* initialize bvec table again */ 2174fb0eb5dfSMing Lei md_bio_reset_resync_pages(b, rp, r1_bio->sectors << 9); 217530bc9b53SNeilBrown } 21768f19ccb2SNeilBrown for (primary = 0; primary < conf->raid_disks * 2; primary++) 2177a68e5870SNeilBrown if (r1_bio->bios[primary]->bi_end_io == end_sync_read && 21784e4cbee9SChristoph Hellwig !r1_bio->bios[primary]->bi_status) { 2179a68e5870SNeilBrown r1_bio->bios[primary]->bi_end_io = NULL; 2180a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[primary].rdev, mddev); 2181a68e5870SNeilBrown break; 2182a68e5870SNeilBrown } 2183a68e5870SNeilBrown r1_bio->read_disk = primary; 21848f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 21852b070cfeSChristoph Hellwig int j = 0; 2186a68e5870SNeilBrown struct bio *pbio = r1_bio->bios[primary]; 2187a68e5870SNeilBrown struct bio *sbio = r1_bio->bios[i]; 21884e4cbee9SChristoph Hellwig blk_status_t status = sbio->bi_status; 218944cf0f4dSMing Lei struct page **ppages = get_resync_pages(pbio)->pages; 219044cf0f4dSMing Lei struct page **spages = get_resync_pages(sbio)->pages; 219160928a91SMing Lei struct bio_vec *bi; 21928fc04e6eSMing Lei int page_len[RESYNC_PAGES] = { 0 }; 21936dc4f100SMing Lei struct bvec_iter_all iter_all; 219478d7f5f7SNeilBrown 21952aabaa65SKent Overstreet if (sbio->bi_end_io != end_sync_read) 219678d7f5f7SNeilBrown continue; 21974246a0b6SChristoph Hellwig /* Now we can 'fixup' the error value */ 21984e4cbee9SChristoph Hellwig sbio->bi_status = 0; 2199a68e5870SNeilBrown 22002b070cfeSChristoph Hellwig bio_for_each_segment_all(bi, sbio, iter_all) 22012b070cfeSChristoph Hellwig page_len[j++] = bi->bv_len; 220260928a91SMing Lei 22034e4cbee9SChristoph Hellwig if (!status) { 2204a68e5870SNeilBrown for (j = vcnt; j-- ; ) { 220544cf0f4dSMing Lei if (memcmp(page_address(ppages[j]), 220644cf0f4dSMing Lei page_address(spages[j]), 220760928a91SMing Lei page_len[j])) 2208a68e5870SNeilBrown break; 2209a68e5870SNeilBrown } 2210a68e5870SNeilBrown } else 2211a68e5870SNeilBrown j = 0; 2212a68e5870SNeilBrown if (j >= 0) 22137f7583d4SJianpeng Ma atomic64_add(r1_bio->sectors, &mddev->resync_mismatches); 2214a68e5870SNeilBrown if (j < 0 || (test_bit(MD_RECOVERY_CHECK, &mddev->recovery) 22154e4cbee9SChristoph Hellwig && !status)) { 221678d7f5f7SNeilBrown /* No need to write to this device. */ 2217a68e5870SNeilBrown sbio->bi_end_io = NULL; 2218a68e5870SNeilBrown rdev_dec_pending(conf->mirrors[i].rdev, mddev); 221978d7f5f7SNeilBrown continue; 222078d7f5f7SNeilBrown } 2221d3b45c2aSKent Overstreet 2222d3b45c2aSKent Overstreet bio_copy_data(sbio, pbio); 2223a68e5870SNeilBrown } 2224a68e5870SNeilBrown } 2225a68e5870SNeilBrown 22269f2c9d12SNeilBrown static void sync_request_write(struct mddev *mddev, struct r1bio *r1_bio) 2227a68e5870SNeilBrown { 2228e8096360SNeilBrown struct r1conf *conf = mddev->private; 2229a68e5870SNeilBrown int i; 22308f19ccb2SNeilBrown int disks = conf->raid_disks * 2; 2231037d2ff6SGuoqing Jiang struct bio *wbio; 2232a68e5870SNeilBrown 2233a68e5870SNeilBrown if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) 2234a68e5870SNeilBrown /* ouch - failed to read all of that. */ 2235a68e5870SNeilBrown if (!fix_sync_read_error(r1_bio)) 2236a68e5870SNeilBrown return; 22377ca78d57SNeilBrown 22387ca78d57SNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2239c95e6385SNeilBrown process_checks(r1_bio); 2240c95e6385SNeilBrown 2241d11c171eSNeilBrown /* 2242d11c171eSNeilBrown * schedule writes 2243d11c171eSNeilBrown */ 22441da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 22451da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 22461da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 22473e198f78SNeilBrown if (wbio->bi_end_io == NULL || 22483e198f78SNeilBrown (wbio->bi_end_io == end_sync_read && 22493e198f78SNeilBrown (i == r1_bio->read_disk || 22503e198f78SNeilBrown !test_bit(MD_RECOVERY_SYNC, &mddev->recovery)))) 22511da177e4SLinus Torvalds continue; 2252dfcc34c9SNate Dailey if (test_bit(Faulty, &conf->mirrors[i].rdev->flags)) { 2253dfcc34c9SNate Dailey abort_sync_write(mddev, r1_bio); 22540c9d5b12SNeilBrown continue; 2255dfcc34c9SNate Dailey } 22561da177e4SLinus Torvalds 2257796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 2258212e7eb7SNeilBrown if (test_bit(FailFast, &conf->mirrors[i].rdev->flags)) 2259212e7eb7SNeilBrown wbio->bi_opf |= MD_FAILFAST; 2260212e7eb7SNeilBrown 22613e198f78SNeilBrown wbio->bi_end_io = end_sync_write; 22621da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 2263aa8b57aaSKent Overstreet md_sync_acct(conf->mirrors[i].rdev->bdev, bio_sectors(wbio)); 2264191ea9b2SNeilBrown 2265ed00aabdSChristoph Hellwig submit_bio_noacct(wbio); 22661da177e4SLinus Torvalds } 22671da177e4SLinus Torvalds 2268449808a2SHou Tao put_sync_write_buf(r1_bio, 1); 22691da177e4SLinus Torvalds } 22701da177e4SLinus Torvalds 22711da177e4SLinus Torvalds /* 22721da177e4SLinus Torvalds * This is a kernel thread which: 22731da177e4SLinus Torvalds * 22741da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 22751da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 2276d2eb35acSNeilBrown * 3. Performs writes following reads for array synchronising. 22771da177e4SLinus Torvalds */ 22781da177e4SLinus Torvalds 2279e8096360SNeilBrown static void fix_read_error(struct r1conf *conf, int read_disk, 2280867868fbSNeilBrown sector_t sect, int sectors) 2281867868fbSNeilBrown { 2282fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 2283867868fbSNeilBrown while(sectors) { 2284867868fbSNeilBrown int s = sectors; 2285867868fbSNeilBrown int d = read_disk; 2286867868fbSNeilBrown int success = 0; 2287867868fbSNeilBrown int start; 22883cb03002SNeilBrown struct md_rdev *rdev; 2289867868fbSNeilBrown 2290867868fbSNeilBrown if (s > (PAGE_SIZE>>9)) 2291867868fbSNeilBrown s = PAGE_SIZE >> 9; 2292867868fbSNeilBrown 2293867868fbSNeilBrown do { 2294d2eb35acSNeilBrown sector_t first_bad; 2295d2eb35acSNeilBrown int bad_sectors; 2296d2eb35acSNeilBrown 2297707a6a42SNeilBrown rcu_read_lock(); 2298707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2299867868fbSNeilBrown if (rdev && 2300da8840a7Smajianpeng (test_bit(In_sync, &rdev->flags) || 2301da8840a7Smajianpeng (!test_bit(Faulty, &rdev->flags) && 2302da8840a7Smajianpeng rdev->recovery_offset >= sect + s)) && 2303d2eb35acSNeilBrown is_badblock(rdev, sect, s, 2304707a6a42SNeilBrown &first_bad, &bad_sectors) == 0) { 2305707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2306707a6a42SNeilBrown rcu_read_unlock(); 2307707a6a42SNeilBrown if (sync_page_io(rdev, sect, s<<9, 23084ce4c73fSBart Van Assche conf->tmppage, REQ_OP_READ, false)) 2309867868fbSNeilBrown success = 1; 2310707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2311707a6a42SNeilBrown if (success) 2312707a6a42SNeilBrown break; 2313707a6a42SNeilBrown } else 2314707a6a42SNeilBrown rcu_read_unlock(); 2315867868fbSNeilBrown d++; 23168f19ccb2SNeilBrown if (d == conf->raid_disks * 2) 2317867868fbSNeilBrown d = 0; 2318867868fbSNeilBrown } while (!success && d != read_disk); 2319867868fbSNeilBrown 2320867868fbSNeilBrown if (!success) { 2321d8f05d29SNeilBrown /* Cannot read from anywhere - mark it bad */ 23223cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[read_disk].rdev; 2323d8f05d29SNeilBrown if (!rdev_set_badblocks(rdev, sect, s, 0)) 2324d8f05d29SNeilBrown md_error(mddev, rdev); 2325867868fbSNeilBrown break; 2326867868fbSNeilBrown } 2327867868fbSNeilBrown /* write it back and re-read */ 2328867868fbSNeilBrown start = d; 2329867868fbSNeilBrown while (d != read_disk) { 2330867868fbSNeilBrown if (d==0) 23318f19ccb2SNeilBrown d = conf->raid_disks * 2; 2332867868fbSNeilBrown d--; 2333707a6a42SNeilBrown rcu_read_lock(); 2334707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2335867868fbSNeilBrown if (rdev && 2336707a6a42SNeilBrown !test_bit(Faulty, &rdev->flags)) { 2337707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2338707a6a42SNeilBrown rcu_read_unlock(); 2339d8f05d29SNeilBrown r1_sync_page_io(rdev, sect, s, 2340d8f05d29SNeilBrown conf->tmppage, WRITE); 2341707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2342707a6a42SNeilBrown } else 2343707a6a42SNeilBrown rcu_read_unlock(); 2344867868fbSNeilBrown } 2345867868fbSNeilBrown d = start; 2346867868fbSNeilBrown while (d != read_disk) { 2347867868fbSNeilBrown if (d==0) 23488f19ccb2SNeilBrown d = conf->raid_disks * 2; 2349867868fbSNeilBrown d--; 2350707a6a42SNeilBrown rcu_read_lock(); 2351707a6a42SNeilBrown rdev = rcu_dereference(conf->mirrors[d].rdev); 2352867868fbSNeilBrown if (rdev && 2353b8cb6b4cSNeilBrown !test_bit(Faulty, &rdev->flags)) { 2354707a6a42SNeilBrown atomic_inc(&rdev->nr_pending); 2355707a6a42SNeilBrown rcu_read_unlock(); 2356d8f05d29SNeilBrown if (r1_sync_page_io(rdev, sect, s, 2357d8f05d29SNeilBrown conf->tmppage, READ)) { 2358867868fbSNeilBrown atomic_add(s, &rdev->corrected_errors); 2359913cce5aSChristoph Hellwig pr_info("md/raid1:%s: read error corrected (%d sectors at %llu on %pg)\n", 2360867868fbSNeilBrown mdname(mddev), s, 2361969b755aSRandy Dunlap (unsigned long long)(sect + 2362969b755aSRandy Dunlap rdev->data_offset), 2363913cce5aSChristoph Hellwig rdev->bdev); 2364867868fbSNeilBrown } 2365707a6a42SNeilBrown rdev_dec_pending(rdev, mddev); 2366707a6a42SNeilBrown } else 2367707a6a42SNeilBrown rcu_read_unlock(); 2368867868fbSNeilBrown } 2369867868fbSNeilBrown sectors -= s; 2370867868fbSNeilBrown sect += s; 2371867868fbSNeilBrown } 2372867868fbSNeilBrown } 2373867868fbSNeilBrown 23749f2c9d12SNeilBrown static int narrow_write_error(struct r1bio *r1_bio, int i) 2375cd5ff9a1SNeilBrown { 2376fd01b88cSNeilBrown struct mddev *mddev = r1_bio->mddev; 2377e8096360SNeilBrown struct r1conf *conf = mddev->private; 23783cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[i].rdev; 2379cd5ff9a1SNeilBrown 2380cd5ff9a1SNeilBrown /* bio has the data to be written to device 'i' where 2381cd5ff9a1SNeilBrown * we just recently had a write error. 2382cd5ff9a1SNeilBrown * We repeatedly clone the bio and trim down to one block, 2383cd5ff9a1SNeilBrown * then try the write. Where the write fails we record 2384cd5ff9a1SNeilBrown * a bad block. 2385cd5ff9a1SNeilBrown * It is conceivable that the bio doesn't exactly align with 2386cd5ff9a1SNeilBrown * blocks. We must handle this somehow. 2387cd5ff9a1SNeilBrown * 2388cd5ff9a1SNeilBrown * We currently own a reference on the rdev. 2389cd5ff9a1SNeilBrown */ 2390cd5ff9a1SNeilBrown 2391cd5ff9a1SNeilBrown int block_sectors; 2392cd5ff9a1SNeilBrown sector_t sector; 2393cd5ff9a1SNeilBrown int sectors; 2394cd5ff9a1SNeilBrown int sect_to_write = r1_bio->sectors; 2395cd5ff9a1SNeilBrown int ok = 1; 2396cd5ff9a1SNeilBrown 2397cd5ff9a1SNeilBrown if (rdev->badblocks.shift < 0) 2398cd5ff9a1SNeilBrown return 0; 2399cd5ff9a1SNeilBrown 2400ab713cdcSNate Dailey block_sectors = roundup(1 << rdev->badblocks.shift, 2401ab713cdcSNate Dailey bdev_logical_block_size(rdev->bdev) >> 9); 2402cd5ff9a1SNeilBrown sector = r1_bio->sector; 2403cd5ff9a1SNeilBrown sectors = ((sector + block_sectors) 2404cd5ff9a1SNeilBrown & ~(sector_t)(block_sectors - 1)) 2405cd5ff9a1SNeilBrown - sector; 2406cd5ff9a1SNeilBrown 2407cd5ff9a1SNeilBrown while (sect_to_write) { 2408cd5ff9a1SNeilBrown struct bio *wbio; 2409cd5ff9a1SNeilBrown if (sectors > sect_to_write) 2410cd5ff9a1SNeilBrown sectors = sect_to_write; 2411cd5ff9a1SNeilBrown /* Write at 'sector' for 'sectors'*/ 2412cd5ff9a1SNeilBrown 2413b783863fSKent Overstreet if (test_bit(R1BIO_BehindIO, &r1_bio->state)) { 2414abfc426dSChristoph Hellwig wbio = bio_alloc_clone(rdev->bdev, 2415abfc426dSChristoph Hellwig r1_bio->behind_master_bio, 2416abfc426dSChristoph Hellwig GFP_NOIO, &mddev->bio_set); 2417b783863fSKent Overstreet } else { 2418abfc426dSChristoph Hellwig wbio = bio_alloc_clone(rdev->bdev, r1_bio->master_bio, 2419abfc426dSChristoph Hellwig GFP_NOIO, &mddev->bio_set); 2420b783863fSKent Overstreet } 2421b783863fSKent Overstreet 2422796a5cf0SMike Christie bio_set_op_attrs(wbio, REQ_OP_WRITE, 0); 24234f024f37SKent Overstreet wbio->bi_iter.bi_sector = r1_bio->sector; 24244f024f37SKent Overstreet wbio->bi_iter.bi_size = r1_bio->sectors << 9; 2425cd5ff9a1SNeilBrown 24266678d83fSKent Overstreet bio_trim(wbio, sector - r1_bio->sector, sectors); 24274f024f37SKent Overstreet wbio->bi_iter.bi_sector += rdev->data_offset; 24284e49ea4aSMike Christie 24294e49ea4aSMike Christie if (submit_bio_wait(wbio) < 0) 2430cd5ff9a1SNeilBrown /* failure! */ 2431cd5ff9a1SNeilBrown ok = rdev_set_badblocks(rdev, sector, 2432cd5ff9a1SNeilBrown sectors, 0) 2433cd5ff9a1SNeilBrown && ok; 2434cd5ff9a1SNeilBrown 2435cd5ff9a1SNeilBrown bio_put(wbio); 2436cd5ff9a1SNeilBrown sect_to_write -= sectors; 2437cd5ff9a1SNeilBrown sector += sectors; 2438cd5ff9a1SNeilBrown sectors = block_sectors; 2439cd5ff9a1SNeilBrown } 2440cd5ff9a1SNeilBrown return ok; 2441cd5ff9a1SNeilBrown } 2442cd5ff9a1SNeilBrown 2443e8096360SNeilBrown static void handle_sync_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 244462096bceSNeilBrown { 244562096bceSNeilBrown int m; 244662096bceSNeilBrown int s = r1_bio->sectors; 24478f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) { 24483cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 244962096bceSNeilBrown struct bio *bio = r1_bio->bios[m]; 245062096bceSNeilBrown if (bio->bi_end_io == NULL) 245162096bceSNeilBrown continue; 24524e4cbee9SChristoph Hellwig if (!bio->bi_status && 245362096bceSNeilBrown test_bit(R1BIO_MadeGood, &r1_bio->state)) { 2454c6563a8cSNeilBrown rdev_clear_badblocks(rdev, r1_bio->sector, s, 0); 245562096bceSNeilBrown } 24564e4cbee9SChristoph Hellwig if (bio->bi_status && 245762096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) { 245862096bceSNeilBrown if (!rdev_set_badblocks(rdev, r1_bio->sector, s, 0)) 245962096bceSNeilBrown md_error(conf->mddev, rdev); 246062096bceSNeilBrown } 246162096bceSNeilBrown } 246262096bceSNeilBrown put_buf(r1_bio); 246362096bceSNeilBrown md_done_sync(conf->mddev, s, 1); 246462096bceSNeilBrown } 246562096bceSNeilBrown 2466e8096360SNeilBrown static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio) 246762096bceSNeilBrown { 2468fd76863eScolyli@suse.de int m, idx; 246955ce74d4SNeilBrown bool fail = false; 2470fd76863eScolyli@suse.de 24718f19ccb2SNeilBrown for (m = 0; m < conf->raid_disks * 2 ; m++) 247262096bceSNeilBrown if (r1_bio->bios[m] == IO_MADE_GOOD) { 24733cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[m].rdev; 247462096bceSNeilBrown rdev_clear_badblocks(rdev, 247562096bceSNeilBrown r1_bio->sector, 2476c6563a8cSNeilBrown r1_bio->sectors, 0); 247762096bceSNeilBrown rdev_dec_pending(rdev, conf->mddev); 247862096bceSNeilBrown } else if (r1_bio->bios[m] != NULL) { 247962096bceSNeilBrown /* This drive got a write error. We need to 248062096bceSNeilBrown * narrow down and record precise write 248162096bceSNeilBrown * errors. 248262096bceSNeilBrown */ 248355ce74d4SNeilBrown fail = true; 248462096bceSNeilBrown if (!narrow_write_error(r1_bio, m)) { 248562096bceSNeilBrown md_error(conf->mddev, 248662096bceSNeilBrown conf->mirrors[m].rdev); 248762096bceSNeilBrown /* an I/O failed, we can't clear the bitmap */ 248862096bceSNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 248962096bceSNeilBrown } 249062096bceSNeilBrown rdev_dec_pending(conf->mirrors[m].rdev, 249162096bceSNeilBrown conf->mddev); 249262096bceSNeilBrown } 249355ce74d4SNeilBrown if (fail) { 249455ce74d4SNeilBrown spin_lock_irq(&conf->device_lock); 249555ce74d4SNeilBrown list_add(&r1_bio->retry_list, &conf->bio_end_io_list); 2496fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2497824e47daScolyli@suse.de atomic_inc(&conf->nr_queued[idx]); 249855ce74d4SNeilBrown spin_unlock_irq(&conf->device_lock); 2499824e47daScolyli@suse.de /* 2500824e47daScolyli@suse.de * In case freeze_array() is waiting for condition 2501824e47daScolyli@suse.de * get_unqueued_pending() == extra to be true. 2502824e47daScolyli@suse.de */ 2503824e47daScolyli@suse.de wake_up(&conf->wait_barrier); 250455ce74d4SNeilBrown md_wakeup_thread(conf->mddev->thread); 2505bd8688a1SNeilBrown } else { 2506bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2507bd8688a1SNeilBrown close_write(r1_bio); 250862096bceSNeilBrown raid_end_bio_io(r1_bio); 250962096bceSNeilBrown } 2510bd8688a1SNeilBrown } 251162096bceSNeilBrown 2512e8096360SNeilBrown static void handle_read_error(struct r1conf *conf, struct r1bio *r1_bio) 251362096bceSNeilBrown { 2514fd01b88cSNeilBrown struct mddev *mddev = conf->mddev; 251562096bceSNeilBrown struct bio *bio; 25163cb03002SNeilBrown struct md_rdev *rdev; 251762096bceSNeilBrown 251862096bceSNeilBrown clear_bit(R1BIO_ReadError, &r1_bio->state); 251962096bceSNeilBrown /* we got a read error. Maybe the drive is bad. Maybe just 252062096bceSNeilBrown * the block and we can fix it. 252162096bceSNeilBrown * We freeze all other IO, and try reading the block from 252262096bceSNeilBrown * other devices. When we find one, we re-write 252362096bceSNeilBrown * and check it that fixes the read error. 252462096bceSNeilBrown * This is all done synchronously while the array is 252562096bceSNeilBrown * frozen 252662096bceSNeilBrown */ 25277449f699STomasz Majchrzak 25287449f699STomasz Majchrzak bio = r1_bio->bios[r1_bio->read_disk]; 25297449f699STomasz Majchrzak bio_put(bio); 25307449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = NULL; 25317449f699STomasz Majchrzak 25322e52d449SNeilBrown rdev = conf->mirrors[r1_bio->read_disk].rdev; 25332e52d449SNeilBrown if (mddev->ro == 0 25342e52d449SNeilBrown && !test_bit(FailFast, &rdev->flags)) { 2535e2d59925SNeilBrown freeze_array(conf, 1); 253662096bceSNeilBrown fix_read_error(conf, r1_bio->read_disk, 253762096bceSNeilBrown r1_bio->sector, r1_bio->sectors); 253862096bceSNeilBrown unfreeze_array(conf); 2539b33d1062SGioh Kim } else if (mddev->ro == 0 && test_bit(FailFast, &rdev->flags)) { 2540b33d1062SGioh Kim md_error(mddev, rdev); 25417449f699STomasz Majchrzak } else { 25427449f699STomasz Majchrzak r1_bio->bios[r1_bio->read_disk] = IO_BLOCKED; 25437449f699STomasz Majchrzak } 25447449f699STomasz Majchrzak 25452e52d449SNeilBrown rdev_dec_pending(rdev, conf->mddev); 2546689389a0SNeilBrown allow_barrier(conf, r1_bio->sector); 2547689389a0SNeilBrown bio = r1_bio->master_bio; 254862096bceSNeilBrown 2549689389a0SNeilBrown /* Reuse the old r1_bio so that the IO_BLOCKED settings are preserved */ 2550689389a0SNeilBrown r1_bio->state = 0; 2551689389a0SNeilBrown raid1_read_request(mddev, bio, r1_bio->sectors, r1_bio); 2552109e3765SNeilBrown } 255362096bceSNeilBrown 25544ed8731dSShaohua Li static void raid1d(struct md_thread *thread) 25551da177e4SLinus Torvalds { 25564ed8731dSShaohua Li struct mddev *mddev = thread->mddev; 25579f2c9d12SNeilBrown struct r1bio *r1_bio; 25581da177e4SLinus Torvalds unsigned long flags; 2559e8096360SNeilBrown struct r1conf *conf = mddev->private; 25601da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 2561e1dfa0a2SNeilBrown struct blk_plug plug; 2562fd76863eScolyli@suse.de int idx; 25631da177e4SLinus Torvalds 25641da177e4SLinus Torvalds md_check_recovery(mddev); 25651da177e4SLinus Torvalds 256655ce74d4SNeilBrown if (!list_empty_careful(&conf->bio_end_io_list) && 25672953079cSShaohua Li !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) { 256855ce74d4SNeilBrown LIST_HEAD(tmp); 256955ce74d4SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 2570fd76863eScolyli@suse.de if (!test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags)) 2571fd76863eScolyli@suse.de list_splice_init(&conf->bio_end_io_list, &tmp); 257255ce74d4SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 257355ce74d4SNeilBrown while (!list_empty(&tmp)) { 2574a452744bSMikulas Patocka r1_bio = list_first_entry(&tmp, struct r1bio, 2575a452744bSMikulas Patocka retry_list); 257655ce74d4SNeilBrown list_del(&r1_bio->retry_list); 2577fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2578824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 2579bd8688a1SNeilBrown if (mddev->degraded) 2580bd8688a1SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 2581bd8688a1SNeilBrown if (test_bit(R1BIO_WriteError, &r1_bio->state)) 2582bd8688a1SNeilBrown close_write(r1_bio); 258355ce74d4SNeilBrown raid_end_bio_io(r1_bio); 258455ce74d4SNeilBrown } 258555ce74d4SNeilBrown } 258655ce74d4SNeilBrown 2587e1dfa0a2SNeilBrown blk_start_plug(&plug); 25881da177e4SLinus Torvalds for (;;) { 2589a35e63efSNeilBrown 25907eaceaccSJens Axboe flush_pending_writes(conf); 2591a35e63efSNeilBrown 25921da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2593a35e63efSNeilBrown if (list_empty(head)) { 2594191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 25951da177e4SLinus Torvalds break; 2596a35e63efSNeilBrown } 25979f2c9d12SNeilBrown r1_bio = list_entry(head->prev, struct r1bio, retry_list); 25981da177e4SLinus Torvalds list_del(head->prev); 2599fd76863eScolyli@suse.de idx = sector_to_idx(r1_bio->sector); 2600824e47daScolyli@suse.de atomic_dec(&conf->nr_queued[idx]); 26011da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 26021da177e4SLinus Torvalds 26031da177e4SLinus Torvalds mddev = r1_bio->mddev; 2604070ec55dSNeilBrown conf = mddev->private; 26054367af55SNeilBrown if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 2606d8f05d29SNeilBrown if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 260762096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 260862096bceSNeilBrown handle_sync_write_finished(conf, r1_bio); 260962096bceSNeilBrown else 26101da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 2611cd5ff9a1SNeilBrown } else if (test_bit(R1BIO_MadeGood, &r1_bio->state) || 261262096bceSNeilBrown test_bit(R1BIO_WriteError, &r1_bio->state)) 261362096bceSNeilBrown handle_write_finished(conf, r1_bio); 261462096bceSNeilBrown else if (test_bit(R1BIO_ReadError, &r1_bio->state)) 261562096bceSNeilBrown handle_read_error(conf, r1_bio); 2616d2eb35acSNeilBrown else 2617c230e7e5SNeilBrown WARN_ON_ONCE(1); 261862096bceSNeilBrown 26191d9d5241SNeilBrown cond_resched(); 26202953079cSShaohua Li if (mddev->sb_flags & ~(1<<MD_SB_CHANGE_PENDING)) 2621de393cdeSNeilBrown md_check_recovery(mddev); 26221da177e4SLinus Torvalds } 2623e1dfa0a2SNeilBrown blk_finish_plug(&plug); 26241da177e4SLinus Torvalds } 26251da177e4SLinus Torvalds 2626e8096360SNeilBrown static int init_resync(struct r1conf *conf) 26271da177e4SLinus Torvalds { 26281da177e4SLinus Torvalds int buffs; 26291da177e4SLinus Torvalds 26301da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 2631afeee514SKent Overstreet BUG_ON(mempool_initialized(&conf->r1buf_pool)); 2632afeee514SKent Overstreet 2633afeee514SKent Overstreet return mempool_init(&conf->r1buf_pool, buffs, r1buf_pool_alloc, 2634afeee514SKent Overstreet r1buf_pool_free, conf->poolinfo); 26351da177e4SLinus Torvalds } 26361da177e4SLinus Torvalds 2637208410b5SShaohua Li static struct r1bio *raid1_alloc_init_r1buf(struct r1conf *conf) 2638208410b5SShaohua Li { 2639afeee514SKent Overstreet struct r1bio *r1bio = mempool_alloc(&conf->r1buf_pool, GFP_NOIO); 2640208410b5SShaohua Li struct resync_pages *rps; 2641208410b5SShaohua Li struct bio *bio; 2642208410b5SShaohua Li int i; 2643208410b5SShaohua Li 2644208410b5SShaohua Li for (i = conf->poolinfo->raid_disks; i--; ) { 2645208410b5SShaohua Li bio = r1bio->bios[i]; 2646208410b5SShaohua Li rps = bio->bi_private; 2647a7c50c94SChristoph Hellwig bio_reset(bio, NULL, 0); 2648208410b5SShaohua Li bio->bi_private = rps; 2649208410b5SShaohua Li } 2650208410b5SShaohua Li r1bio->master_bio = NULL; 2651208410b5SShaohua Li return r1bio; 2652208410b5SShaohua Li } 2653208410b5SShaohua Li 26541da177e4SLinus Torvalds /* 26551da177e4SLinus Torvalds * perform a "sync" on one "block" 26561da177e4SLinus Torvalds * 26571da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 26581da177e4SLinus Torvalds * requests - conflict with active sync requests. 26591da177e4SLinus Torvalds * 26601da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 26611da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 26621da177e4SLinus Torvalds */ 26631da177e4SLinus Torvalds 2664849674e4SShaohua Li static sector_t raid1_sync_request(struct mddev *mddev, sector_t sector_nr, 2665849674e4SShaohua Li int *skipped) 26661da177e4SLinus Torvalds { 2667e8096360SNeilBrown struct r1conf *conf = mddev->private; 26689f2c9d12SNeilBrown struct r1bio *r1_bio; 26691da177e4SLinus Torvalds struct bio *bio; 26701da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 26713e198f78SNeilBrown int disk = -1; 26721da177e4SLinus Torvalds int i; 26733e198f78SNeilBrown int wonly = -1; 26743e198f78SNeilBrown int write_targets = 0, read_targets = 0; 267557dab0bdSNeilBrown sector_t sync_blocks; 2676e3b9703eSNeilBrown int still_degraded = 0; 267706f60385SNeilBrown int good_sectors = RESYNC_SECTORS; 267806f60385SNeilBrown int min_bad = 0; /* number of sectors that are bad in all devices */ 2679fd76863eScolyli@suse.de int idx = sector_to_idx(sector_nr); 2680022e510fSMing Lei int page_idx = 0; 26811da177e4SLinus Torvalds 2682afeee514SKent Overstreet if (!mempool_initialized(&conf->r1buf_pool)) 26831da177e4SLinus Torvalds if (init_resync(conf)) 268457afd89fSNeilBrown return 0; 26851da177e4SLinus Torvalds 268658c0fed4SAndre Noll max_sector = mddev->dev_sectors; 26871da177e4SLinus Torvalds if (sector_nr >= max_sector) { 2688191ea9b2SNeilBrown /* If we aborted, we need to abort the 2689191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 2690191ea9b2SNeilBrown * only be one in raid1 resync. 2691191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 2692191ea9b2SNeilBrown */ 26936a806c51SNeilBrown if (mddev->curr_resync < max_sector) /* aborted */ 2694e64e4018SAndy Shevchenko md_bitmap_end_sync(mddev->bitmap, mddev->curr_resync, 2695191ea9b2SNeilBrown &sync_blocks, 1); 26966a806c51SNeilBrown else /* completed sync */ 2697191ea9b2SNeilBrown conf->fullsync = 0; 26986a806c51SNeilBrown 2699e64e4018SAndy Shevchenko md_bitmap_close_sync(mddev->bitmap); 27001da177e4SLinus Torvalds close_sync(conf); 2701c40f341fSGoldwyn Rodrigues 2702c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev)) { 2703c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = 0; 2704c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = 0; 2705c40f341fSGoldwyn Rodrigues } 27061da177e4SLinus Torvalds return 0; 27071da177e4SLinus Torvalds } 27081da177e4SLinus Torvalds 270907d84d10SNeilBrown if (mddev->bitmap == NULL && 271007d84d10SNeilBrown mddev->recovery_cp == MaxSector && 27116394cca5SNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery) && 271207d84d10SNeilBrown conf->fullsync == 0) { 271307d84d10SNeilBrown *skipped = 1; 271407d84d10SNeilBrown return max_sector - sector_nr; 271507d84d10SNeilBrown } 27166394cca5SNeilBrown /* before building a request, check if we can skip these blocks.. 27176394cca5SNeilBrown * This call the bitmap_start_sync doesn't actually record anything 27186394cca5SNeilBrown */ 2719e64e4018SAndy Shevchenko if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, 1) && 2720e5de485fSNeilBrown !conf->fullsync && !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2721191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 2722191ea9b2SNeilBrown *skipped = 1; 2723191ea9b2SNeilBrown return sync_blocks; 2724191ea9b2SNeilBrown } 272517999be4SNeilBrown 27267ac50447STomasz Majchrzak /* 27277ac50447STomasz Majchrzak * If there is non-resync activity waiting for a turn, then let it 27287ac50447STomasz Majchrzak * though before starting on this new sync request. 27297ac50447STomasz Majchrzak */ 2730824e47daScolyli@suse.de if (atomic_read(&conf->nr_waiting[idx])) 27317ac50447STomasz Majchrzak schedule_timeout_uninterruptible(1); 27327ac50447STomasz Majchrzak 2733c40f341fSGoldwyn Rodrigues /* we are incrementing sector_nr below. To be safe, we check against 2734c40f341fSGoldwyn Rodrigues * sector_nr + two times RESYNC_SECTORS 2735c40f341fSGoldwyn Rodrigues */ 2736c40f341fSGoldwyn Rodrigues 2737e64e4018SAndy Shevchenko md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, 2738c40f341fSGoldwyn Rodrigues mddev_is_clustered(mddev) && (sector_nr + 2 * RESYNC_SECTORS > conf->cluster_sync_high)); 273917999be4SNeilBrown 27408c242593SYufen Yu 27418c242593SYufen Yu if (raise_barrier(conf, sector_nr)) 27428c242593SYufen Yu return 0; 27438c242593SYufen Yu 27448c242593SYufen Yu r1_bio = raid1_alloc_init_r1buf(conf); 27451da177e4SLinus Torvalds 27463e198f78SNeilBrown rcu_read_lock(); 27473e198f78SNeilBrown /* 27483e198f78SNeilBrown * If we get a correctably read error during resync or recovery, 27493e198f78SNeilBrown * we might want to read from a different device. So we 27503e198f78SNeilBrown * flag all drives that could conceivably be read from for READ, 27513e198f78SNeilBrown * and any others (which will be non-In_sync devices) for WRITE. 27523e198f78SNeilBrown * If a read fails, we try reading from something else for which READ 27533e198f78SNeilBrown * is OK. 27543e198f78SNeilBrown */ 27551da177e4SLinus Torvalds 27561da177e4SLinus Torvalds r1_bio->mddev = mddev; 27571da177e4SLinus Torvalds r1_bio->sector = sector_nr; 2758191ea9b2SNeilBrown r1_bio->state = 0; 27591da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 2760fd76863eScolyli@suse.de /* make sure good_sectors won't go across barrier unit boundary */ 2761fd76863eScolyli@suse.de good_sectors = align_to_barrier_unit_end(sector_nr, good_sectors); 27621da177e4SLinus Torvalds 27638f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 27643cb03002SNeilBrown struct md_rdev *rdev; 27651da177e4SLinus Torvalds bio = r1_bio->bios[i]; 27661da177e4SLinus Torvalds 27673e198f78SNeilBrown rdev = rcu_dereference(conf->mirrors[i].rdev); 27683e198f78SNeilBrown if (rdev == NULL || 27693e198f78SNeilBrown test_bit(Faulty, &rdev->flags)) { 27708f19ccb2SNeilBrown if (i < conf->raid_disks) 2771e3b9703eSNeilBrown still_degraded = 1; 27723e198f78SNeilBrown } else if (!test_bit(In_sync, &rdev->flags)) { 2773796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 27741da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 27751da177e4SLinus Torvalds write_targets ++; 27763e198f78SNeilBrown } else { 27773e198f78SNeilBrown /* may need to read from here */ 277806f60385SNeilBrown sector_t first_bad = MaxSector; 277906f60385SNeilBrown int bad_sectors; 278006f60385SNeilBrown 278106f60385SNeilBrown if (is_badblock(rdev, sector_nr, good_sectors, 278206f60385SNeilBrown &first_bad, &bad_sectors)) { 278306f60385SNeilBrown if (first_bad > sector_nr) 278406f60385SNeilBrown good_sectors = first_bad - sector_nr; 278506f60385SNeilBrown else { 278606f60385SNeilBrown bad_sectors -= (sector_nr - first_bad); 278706f60385SNeilBrown if (min_bad == 0 || 278806f60385SNeilBrown min_bad > bad_sectors) 278906f60385SNeilBrown min_bad = bad_sectors; 279006f60385SNeilBrown } 279106f60385SNeilBrown } 279206f60385SNeilBrown if (sector_nr < first_bad) { 27933e198f78SNeilBrown if (test_bit(WriteMostly, &rdev->flags)) { 27943e198f78SNeilBrown if (wonly < 0) 27953e198f78SNeilBrown wonly = i; 27963e198f78SNeilBrown } else { 27973e198f78SNeilBrown if (disk < 0) 27983e198f78SNeilBrown disk = i; 27993e198f78SNeilBrown } 2800796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_READ, 0); 280106f60385SNeilBrown bio->bi_end_io = end_sync_read; 28023e198f78SNeilBrown read_targets++; 2803d57368afSAlexander Lyakas } else if (!test_bit(WriteErrorSeen, &rdev->flags) && 2804d57368afSAlexander Lyakas test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && 2805d57368afSAlexander Lyakas !test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { 2806d57368afSAlexander Lyakas /* 2807d57368afSAlexander Lyakas * The device is suitable for reading (InSync), 2808d57368afSAlexander Lyakas * but has bad block(s) here. Let's try to correct them, 2809d57368afSAlexander Lyakas * if we are doing resync or repair. Otherwise, leave 2810d57368afSAlexander Lyakas * this device alone for this sync request. 2811d57368afSAlexander Lyakas */ 2812796a5cf0SMike Christie bio_set_op_attrs(bio, REQ_OP_WRITE, 0); 2813d57368afSAlexander Lyakas bio->bi_end_io = end_sync_write; 2814d57368afSAlexander Lyakas write_targets++; 28153e198f78SNeilBrown } 281606f60385SNeilBrown } 2817028288dfSZhiqiang Liu if (rdev && bio->bi_end_io) { 28183e198f78SNeilBrown atomic_inc(&rdev->nr_pending); 28194f024f37SKent Overstreet bio->bi_iter.bi_sector = sector_nr + rdev->data_offset; 282074d46992SChristoph Hellwig bio_set_dev(bio, rdev->bdev); 28212e52d449SNeilBrown if (test_bit(FailFast, &rdev->flags)) 28222e52d449SNeilBrown bio->bi_opf |= MD_FAILFAST; 28231da177e4SLinus Torvalds } 282406f60385SNeilBrown } 28253e198f78SNeilBrown rcu_read_unlock(); 28263e198f78SNeilBrown if (disk < 0) 28273e198f78SNeilBrown disk = wonly; 28283e198f78SNeilBrown r1_bio->read_disk = disk; 2829191ea9b2SNeilBrown 283006f60385SNeilBrown if (read_targets == 0 && min_bad > 0) { 283106f60385SNeilBrown /* These sectors are bad on all InSync devices, so we 283206f60385SNeilBrown * need to mark them bad on all write targets 283306f60385SNeilBrown */ 283406f60385SNeilBrown int ok = 1; 28358f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2 ; i++) 283606f60385SNeilBrown if (r1_bio->bios[i]->bi_end_io == end_sync_write) { 2837a42f9d83Smajianpeng struct md_rdev *rdev = conf->mirrors[i].rdev; 283806f60385SNeilBrown ok = rdev_set_badblocks(rdev, sector_nr, 283906f60385SNeilBrown min_bad, 0 284006f60385SNeilBrown ) && ok; 284106f60385SNeilBrown } 28422953079cSShaohua Li set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 284306f60385SNeilBrown *skipped = 1; 284406f60385SNeilBrown put_buf(r1_bio); 284506f60385SNeilBrown 284606f60385SNeilBrown if (!ok) { 284706f60385SNeilBrown /* Cannot record the badblocks, so need to 284806f60385SNeilBrown * abort the resync. 284906f60385SNeilBrown * If there are multiple read targets, could just 285006f60385SNeilBrown * fail the really bad ones ??? 285106f60385SNeilBrown */ 285206f60385SNeilBrown conf->recovery_disabled = mddev->recovery_disabled; 285306f60385SNeilBrown set_bit(MD_RECOVERY_INTR, &mddev->recovery); 285406f60385SNeilBrown return 0; 285506f60385SNeilBrown } else 285606f60385SNeilBrown return min_bad; 285706f60385SNeilBrown 285806f60385SNeilBrown } 285906f60385SNeilBrown if (min_bad > 0 && min_bad < good_sectors) { 286006f60385SNeilBrown /* only resync enough to reach the next bad->good 286106f60385SNeilBrown * transition */ 286206f60385SNeilBrown good_sectors = min_bad; 286306f60385SNeilBrown } 286406f60385SNeilBrown 28653e198f78SNeilBrown if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && read_targets > 0) 28663e198f78SNeilBrown /* extra read targets are also write targets */ 28673e198f78SNeilBrown write_targets += read_targets-1; 28683e198f78SNeilBrown 28693e198f78SNeilBrown if (write_targets == 0 || read_targets == 0) { 28701da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 28711da177e4SLinus Torvalds * drives must be failed - so we are finished 28721da177e4SLinus Torvalds */ 2873b7219ccbSNeilBrown sector_t rv; 2874b7219ccbSNeilBrown if (min_bad > 0) 2875b7219ccbSNeilBrown max_sector = sector_nr + min_bad; 2876b7219ccbSNeilBrown rv = max_sector - sector_nr; 287757afd89fSNeilBrown *skipped = 1; 28781da177e4SLinus Torvalds put_buf(r1_bio); 28791da177e4SLinus Torvalds return rv; 28801da177e4SLinus Torvalds } 28811da177e4SLinus Torvalds 2882c6207277SNeilBrown if (max_sector > mddev->resync_max) 2883c6207277SNeilBrown max_sector = mddev->resync_max; /* Don't do IO beyond here */ 288406f60385SNeilBrown if (max_sector > sector_nr + good_sectors) 288506f60385SNeilBrown max_sector = sector_nr + good_sectors; 28861da177e4SLinus Torvalds nr_sectors = 0; 2887289e99e8SNeilBrown sync_blocks = 0; 28881da177e4SLinus Torvalds do { 28891da177e4SLinus Torvalds struct page *page; 28901da177e4SLinus Torvalds int len = PAGE_SIZE; 28911da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 28921da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 28931da177e4SLinus Torvalds if (len == 0) 28941da177e4SLinus Torvalds break; 2895ab7a30c7SNeilBrown if (sync_blocks == 0) { 2896e64e4018SAndy Shevchenko if (!md_bitmap_start_sync(mddev->bitmap, sector_nr, 2897e3b9703eSNeilBrown &sync_blocks, still_degraded) && 2898e5de485fSNeilBrown !conf->fullsync && 2899e5de485fSNeilBrown !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) 2900191ea9b2SNeilBrown break; 29017571ae88SNeilBrown if ((len >> 9) > sync_blocks) 29026a806c51SNeilBrown len = sync_blocks<<9; 2903ab7a30c7SNeilBrown } 2904191ea9b2SNeilBrown 29058f19ccb2SNeilBrown for (i = 0 ; i < conf->raid_disks * 2; i++) { 290698d30c58SMing Lei struct resync_pages *rp; 290798d30c58SMing Lei 29081da177e4SLinus Torvalds bio = r1_bio->bios[i]; 290998d30c58SMing Lei rp = get_resync_pages(bio); 29101da177e4SLinus Torvalds if (bio->bi_end_io) { 2911022e510fSMing Lei page = resync_fetch_page(rp, page_idx); 2912c85ba149SMing Lei 2913c85ba149SMing Lei /* 2914c85ba149SMing Lei * won't fail because the vec table is big 2915c85ba149SMing Lei * enough to hold all these pages 2916c85ba149SMing Lei */ 2917c85ba149SMing Lei bio_add_page(bio, page, len, 0); 29181da177e4SLinus Torvalds } 29191da177e4SLinus Torvalds } 29201da177e4SLinus Torvalds nr_sectors += len>>9; 29211da177e4SLinus Torvalds sector_nr += len>>9; 2922191ea9b2SNeilBrown sync_blocks -= (len>>9); 2923022e510fSMing Lei } while (++page_idx < RESYNC_PAGES); 292498d30c58SMing Lei 29251da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 29261da177e4SLinus Torvalds 2927c40f341fSGoldwyn Rodrigues if (mddev_is_clustered(mddev) && 2928c40f341fSGoldwyn Rodrigues conf->cluster_sync_high < sector_nr + nr_sectors) { 2929c40f341fSGoldwyn Rodrigues conf->cluster_sync_low = mddev->curr_resync_completed; 2930c40f341fSGoldwyn Rodrigues conf->cluster_sync_high = conf->cluster_sync_low + CLUSTER_RESYNC_WINDOW_SECTORS; 2931c40f341fSGoldwyn Rodrigues /* Send resync message */ 2932c40f341fSGoldwyn Rodrigues md_cluster_ops->resync_info_update(mddev, 2933c40f341fSGoldwyn Rodrigues conf->cluster_sync_low, 2934c40f341fSGoldwyn Rodrigues conf->cluster_sync_high); 2935c40f341fSGoldwyn Rodrigues } 2936c40f341fSGoldwyn Rodrigues 2937d11c171eSNeilBrown /* For a user-requested sync, we read all readable devices and do a 2938d11c171eSNeilBrown * compare 2939d11c171eSNeilBrown */ 2940d11c171eSNeilBrown if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { 2941d11c171eSNeilBrown atomic_set(&r1_bio->remaining, read_targets); 29422d4f4f33SNeilBrown for (i = 0; i < conf->raid_disks * 2 && read_targets; i++) { 2943d11c171eSNeilBrown bio = r1_bio->bios[i]; 2944d11c171eSNeilBrown if (bio->bi_end_io == end_sync_read) { 29452d4f4f33SNeilBrown read_targets--; 294674d46992SChristoph Hellwig md_sync_acct_bio(bio, nr_sectors); 29472e52d449SNeilBrown if (read_targets == 1) 29482e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2949ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 2950d11c171eSNeilBrown } 2951d11c171eSNeilBrown } 2952d11c171eSNeilBrown } else { 2953d11c171eSNeilBrown atomic_set(&r1_bio->remaining, 1); 2954d11c171eSNeilBrown bio = r1_bio->bios[r1_bio->read_disk]; 295574d46992SChristoph Hellwig md_sync_acct_bio(bio, nr_sectors); 29562e52d449SNeilBrown if (read_targets == 1) 29572e52d449SNeilBrown bio->bi_opf &= ~MD_FAILFAST; 2958ed00aabdSChristoph Hellwig submit_bio_noacct(bio); 2959d11c171eSNeilBrown } 29601da177e4SLinus Torvalds return nr_sectors; 29611da177e4SLinus Torvalds } 29621da177e4SLinus Torvalds 2963fd01b88cSNeilBrown static sector_t raid1_size(struct mddev *mddev, sector_t sectors, int raid_disks) 296480c3a6ceSDan Williams { 296580c3a6ceSDan Williams if (sectors) 296680c3a6ceSDan Williams return sectors; 296780c3a6ceSDan Williams 296880c3a6ceSDan Williams return mddev->dev_sectors; 296980c3a6ceSDan Williams } 297080c3a6ceSDan Williams 2971e8096360SNeilBrown static struct r1conf *setup_conf(struct mddev *mddev) 29721da177e4SLinus Torvalds { 2973e8096360SNeilBrown struct r1conf *conf; 2974709ae487SNeilBrown int i; 29750eaf822cSJonathan Brassow struct raid1_info *disk; 29763cb03002SNeilBrown struct md_rdev *rdev; 2977709ae487SNeilBrown int err = -ENOMEM; 29781da177e4SLinus Torvalds 2979e8096360SNeilBrown conf = kzalloc(sizeof(struct r1conf), GFP_KERNEL); 29801da177e4SLinus Torvalds if (!conf) 2981709ae487SNeilBrown goto abort; 29821da177e4SLinus Torvalds 2983fd76863eScolyli@suse.de conf->nr_pending = kcalloc(BARRIER_BUCKETS_NR, 2984824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2985fd76863eScolyli@suse.de if (!conf->nr_pending) 2986fd76863eScolyli@suse.de goto abort; 2987fd76863eScolyli@suse.de 2988fd76863eScolyli@suse.de conf->nr_waiting = kcalloc(BARRIER_BUCKETS_NR, 2989824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2990fd76863eScolyli@suse.de if (!conf->nr_waiting) 2991fd76863eScolyli@suse.de goto abort; 2992fd76863eScolyli@suse.de 2993fd76863eScolyli@suse.de conf->nr_queued = kcalloc(BARRIER_BUCKETS_NR, 2994824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 2995fd76863eScolyli@suse.de if (!conf->nr_queued) 2996fd76863eScolyli@suse.de goto abort; 2997fd76863eScolyli@suse.de 2998fd76863eScolyli@suse.de conf->barrier = kcalloc(BARRIER_BUCKETS_NR, 2999824e47daScolyli@suse.de sizeof(atomic_t), GFP_KERNEL); 3000fd76863eScolyli@suse.de if (!conf->barrier) 3001fd76863eScolyli@suse.de goto abort; 3002fd76863eScolyli@suse.de 30036396bb22SKees Cook conf->mirrors = kzalloc(array3_size(sizeof(struct raid1_info), 30046396bb22SKees Cook mddev->raid_disks, 2), 30051da177e4SLinus Torvalds GFP_KERNEL); 30061da177e4SLinus Torvalds if (!conf->mirrors) 3007709ae487SNeilBrown goto abort; 30081da177e4SLinus Torvalds 3009ddaf22abSNeilBrown conf->tmppage = alloc_page(GFP_KERNEL); 3010ddaf22abSNeilBrown if (!conf->tmppage) 3011709ae487SNeilBrown goto abort; 3012ddaf22abSNeilBrown 3013709ae487SNeilBrown conf->poolinfo = kzalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 30141da177e4SLinus Torvalds if (!conf->poolinfo) 3015709ae487SNeilBrown goto abort; 30168f19ccb2SNeilBrown conf->poolinfo->raid_disks = mddev->raid_disks * 2; 30173f677f9cSMarcos Paulo de Souza err = mempool_init(&conf->r1bio_pool, NR_RAID_BIOS, r1bio_pool_alloc, 3018c7afa803SMarcos Paulo de Souza rbio_pool_free, conf->poolinfo); 3019afeee514SKent Overstreet if (err) 3020709ae487SNeilBrown goto abort; 3021709ae487SNeilBrown 3022afeee514SKent Overstreet err = bioset_init(&conf->bio_split, BIO_POOL_SIZE, 0, 0); 3023afeee514SKent Overstreet if (err) 3024c230e7e5SNeilBrown goto abort; 3025c230e7e5SNeilBrown 3026ed9bfdf1SNeilBrown conf->poolinfo->mddev = mddev; 30271da177e4SLinus Torvalds 3028c19d5798SNeilBrown err = -EINVAL; 3029e7e72bf6SNeil Brown spin_lock_init(&conf->device_lock); 3030dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 3031709ae487SNeilBrown int disk_idx = rdev->raid_disk; 30321da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 30331da177e4SLinus Torvalds || disk_idx < 0) 30341da177e4SLinus Torvalds continue; 3035c19d5798SNeilBrown if (test_bit(Replacement, &rdev->flags)) 303602b898f2SNeilBrown disk = conf->mirrors + mddev->raid_disks + disk_idx; 3037c19d5798SNeilBrown else 30381da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 30391da177e4SLinus Torvalds 3040c19d5798SNeilBrown if (disk->rdev) 3041c19d5798SNeilBrown goto abort; 30421da177e4SLinus Torvalds disk->rdev = rdev; 30431da177e4SLinus Torvalds disk->head_position = 0; 304412cee5a8SShaohua Li disk->seq_start = MaxSector; 30451da177e4SLinus Torvalds } 30461da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 30471da177e4SLinus Torvalds conf->mddev = mddev; 30481da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 304955ce74d4SNeilBrown INIT_LIST_HEAD(&conf->bio_end_io_list); 30501da177e4SLinus Torvalds 30511da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 305217999be4SNeilBrown init_waitqueue_head(&conf->wait_barrier); 30531da177e4SLinus Torvalds 3054191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 3055d890fa2bSNeilBrown conf->recovery_disabled = mddev->recovery_disabled - 1; 3056191ea9b2SNeilBrown 3057c19d5798SNeilBrown err = -EIO; 30588f19ccb2SNeilBrown for (i = 0; i < conf->raid_disks * 2; i++) { 30591da177e4SLinus Torvalds 30601da177e4SLinus Torvalds disk = conf->mirrors + i; 30611da177e4SLinus Torvalds 3062c19d5798SNeilBrown if (i < conf->raid_disks && 3063c19d5798SNeilBrown disk[conf->raid_disks].rdev) { 3064c19d5798SNeilBrown /* This slot has a replacement. */ 3065c19d5798SNeilBrown if (!disk->rdev) { 3066c19d5798SNeilBrown /* No original, just make the replacement 3067c19d5798SNeilBrown * a recovering spare 3068c19d5798SNeilBrown */ 3069c19d5798SNeilBrown disk->rdev = 3070c19d5798SNeilBrown disk[conf->raid_disks].rdev; 3071c19d5798SNeilBrown disk[conf->raid_disks].rdev = NULL; 3072c19d5798SNeilBrown } else if (!test_bit(In_sync, &disk->rdev->flags)) 3073c19d5798SNeilBrown /* Original is not in_sync - bad */ 3074c19d5798SNeilBrown goto abort; 3075c19d5798SNeilBrown } 3076c19d5798SNeilBrown 30775fd6c1dcSNeilBrown if (!disk->rdev || 30785fd6c1dcSNeilBrown !test_bit(In_sync, &disk->rdev->flags)) { 30791da177e4SLinus Torvalds disk->head_position = 0; 30804f0a5e01SJonathan Brassow if (disk->rdev && 30814f0a5e01SJonathan Brassow (disk->rdev->saved_raid_disk < 0)) 308217571284SNeilBrown conf->fullsync = 1; 3083be4d3280SShaohua Li } 30841da177e4SLinus Torvalds } 3085709ae487SNeilBrown 3086709ae487SNeilBrown err = -ENOMEM; 30870232605dSNeilBrown conf->thread = md_register_thread(raid1d, mddev, "raid1"); 30881d41c216SNeilBrown if (!conf->thread) 3089709ae487SNeilBrown goto abort; 3090191ea9b2SNeilBrown 3091709ae487SNeilBrown return conf; 3092709ae487SNeilBrown 3093709ae487SNeilBrown abort: 3094709ae487SNeilBrown if (conf) { 3095afeee514SKent Overstreet mempool_exit(&conf->r1bio_pool); 3096709ae487SNeilBrown kfree(conf->mirrors); 3097709ae487SNeilBrown safe_put_page(conf->tmppage); 3098709ae487SNeilBrown kfree(conf->poolinfo); 3099fd76863eScolyli@suse.de kfree(conf->nr_pending); 3100fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3101fd76863eScolyli@suse.de kfree(conf->nr_queued); 3102fd76863eScolyli@suse.de kfree(conf->barrier); 3103afeee514SKent Overstreet bioset_exit(&conf->bio_split); 3104709ae487SNeilBrown kfree(conf); 3105709ae487SNeilBrown } 3106709ae487SNeilBrown return ERR_PTR(err); 3107709ae487SNeilBrown } 3108709ae487SNeilBrown 3109afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv); 3110849674e4SShaohua Li static int raid1_run(struct mddev *mddev) 3111709ae487SNeilBrown { 3112e8096360SNeilBrown struct r1conf *conf; 3113709ae487SNeilBrown int i; 31143cb03002SNeilBrown struct md_rdev *rdev; 31155220ea1eSmajianpeng int ret; 3116709ae487SNeilBrown 3117709ae487SNeilBrown if (mddev->level != 1) { 31181d41c216SNeilBrown pr_warn("md/raid1:%s: raid level not set to mirroring (%d)\n", 3119709ae487SNeilBrown mdname(mddev), mddev->level); 3120709ae487SNeilBrown return -EIO; 3121709ae487SNeilBrown } 3122709ae487SNeilBrown if (mddev->reshape_position != MaxSector) { 31231d41c216SNeilBrown pr_warn("md/raid1:%s: reshape_position set but not supported\n", 3124709ae487SNeilBrown mdname(mddev)); 3125709ae487SNeilBrown return -EIO; 3126709ae487SNeilBrown } 3127a415c0f1SNeilBrown if (mddev_init_writes_pending(mddev) < 0) 3128a415c0f1SNeilBrown return -ENOMEM; 3129709ae487SNeilBrown /* 3130709ae487SNeilBrown * copy the already verified devices into our private RAID1 3131709ae487SNeilBrown * bookkeeping area. [whatever we allocate in run(), 3132afa0f557SNeilBrown * should be freed in raid1_free()] 3133709ae487SNeilBrown */ 3134709ae487SNeilBrown if (mddev->private == NULL) 3135709ae487SNeilBrown conf = setup_conf(mddev); 3136709ae487SNeilBrown else 3137709ae487SNeilBrown conf = mddev->private; 3138709ae487SNeilBrown 3139709ae487SNeilBrown if (IS_ERR(conf)) 3140709ae487SNeilBrown return PTR_ERR(conf); 3141709ae487SNeilBrown 314210fa225cSChristoph Hellwig if (mddev->queue) 31433deff1a7SChristoph Hellwig blk_queue_max_write_zeroes_sectors(mddev->queue, 0); 31445026d7a9SH. Peter Anvin 3145dafb20faSNeilBrown rdev_for_each(rdev, mddev) { 31461ed7242eSJonathan Brassow if (!mddev->gendisk) 31471ed7242eSJonathan Brassow continue; 3148709ae487SNeilBrown disk_stack_limits(mddev->gendisk, rdev->bdev, 3149709ae487SNeilBrown rdev->data_offset << 9); 3150709ae487SNeilBrown } 3151709ae487SNeilBrown 3152709ae487SNeilBrown mddev->degraded = 0; 3153709ae487SNeilBrown for (i = 0; i < conf->raid_disks; i++) 3154709ae487SNeilBrown if (conf->mirrors[i].rdev == NULL || 3155709ae487SNeilBrown !test_bit(In_sync, &conf->mirrors[i].rdev->flags) || 3156709ae487SNeilBrown test_bit(Faulty, &conf->mirrors[i].rdev->flags)) 3157709ae487SNeilBrown mddev->degraded++; 315807f1a685SYufen Yu /* 315907f1a685SYufen Yu * RAID1 needs at least one disk in active 316007f1a685SYufen Yu */ 316107f1a685SYufen Yu if (conf->raid_disks - mddev->degraded < 1) { 3162*b611ad14SJiang Li md_unregister_thread(&conf->thread); 316307f1a685SYufen Yu ret = -EINVAL; 316407f1a685SYufen Yu goto abort; 316507f1a685SYufen Yu } 3166709ae487SNeilBrown 3167709ae487SNeilBrown if (conf->raid_disks - mddev->degraded == 1) 3168709ae487SNeilBrown mddev->recovery_cp = MaxSector; 3169709ae487SNeilBrown 31708c6ac868SAndre Noll if (mddev->recovery_cp != MaxSector) 31711d41c216SNeilBrown pr_info("md/raid1:%s: not clean -- starting background reconstruction\n", 31728c6ac868SAndre Noll mdname(mddev)); 31731d41c216SNeilBrown pr_info("md/raid1:%s: active with %d out of %d mirrors\n", 31741da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 31751da177e4SLinus Torvalds mddev->raid_disks); 3176709ae487SNeilBrown 31771da177e4SLinus Torvalds /* 31781da177e4SLinus Torvalds * Ok, everything is just fine now 31791da177e4SLinus Torvalds */ 3180709ae487SNeilBrown mddev->thread = conf->thread; 3181709ae487SNeilBrown conf->thread = NULL; 3182709ae487SNeilBrown mddev->private = conf; 318346533ff7SNeilBrown set_bit(MD_FAILFAST_SUPPORTED, &mddev->flags); 3184709ae487SNeilBrown 31851f403624SDan Williams md_set_array_sectors(mddev, raid1_size(mddev, 0, 0)); 31861da177e4SLinus Torvalds 31875220ea1eSmajianpeng ret = md_integrity_register(mddev); 31885aa61f42SNeilBrown if (ret) { 31895aa61f42SNeilBrown md_unregister_thread(&mddev->thread); 319007f1a685SYufen Yu goto abort; 31915aa61f42SNeilBrown } 319207f1a685SYufen Yu return 0; 319307f1a685SYufen Yu 319407f1a685SYufen Yu abort: 319507f1a685SYufen Yu raid1_free(mddev, conf); 31965220ea1eSmajianpeng return ret; 31971da177e4SLinus Torvalds } 31981da177e4SLinus Torvalds 3199afa0f557SNeilBrown static void raid1_free(struct mddev *mddev, void *priv) 32001da177e4SLinus Torvalds { 3201afa0f557SNeilBrown struct r1conf *conf = priv; 32024b6d287fSNeilBrown 3203afeee514SKent Overstreet mempool_exit(&conf->r1bio_pool); 32041da177e4SLinus Torvalds kfree(conf->mirrors); 32050fea7ed8SHirokazu Takahashi safe_put_page(conf->tmppage); 32061da177e4SLinus Torvalds kfree(conf->poolinfo); 3207fd76863eScolyli@suse.de kfree(conf->nr_pending); 3208fd76863eScolyli@suse.de kfree(conf->nr_waiting); 3209fd76863eScolyli@suse.de kfree(conf->nr_queued); 3210fd76863eScolyli@suse.de kfree(conf->barrier); 3211afeee514SKent Overstreet bioset_exit(&conf->bio_split); 32121da177e4SLinus Torvalds kfree(conf); 32131da177e4SLinus Torvalds } 32141da177e4SLinus Torvalds 3215fd01b88cSNeilBrown static int raid1_resize(struct mddev *mddev, sector_t sectors) 32161da177e4SLinus Torvalds { 32171da177e4SLinus Torvalds /* no resync is happening, and there is enough space 32181da177e4SLinus Torvalds * on all devices, so we can resize. 32191da177e4SLinus Torvalds * We need to make sure resync covers any new space. 32201da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 32211da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 32221da177e4SLinus Torvalds * worth it. 32231da177e4SLinus Torvalds */ 3224a4a6125aSNeilBrown sector_t newsize = raid1_size(mddev, sectors, 0); 3225a4a6125aSNeilBrown if (mddev->external_size && 3226a4a6125aSNeilBrown mddev->array_sectors > newsize) 3227b522adcdSDan Williams return -EINVAL; 3228a4a6125aSNeilBrown if (mddev->bitmap) { 3229e64e4018SAndy Shevchenko int ret = md_bitmap_resize(mddev->bitmap, newsize, 0, 0); 3230a4a6125aSNeilBrown if (ret) 3231a4a6125aSNeilBrown return ret; 3232a4a6125aSNeilBrown } 3233a4a6125aSNeilBrown md_set_array_sectors(mddev, newsize); 3234b522adcdSDan Williams if (sectors > mddev->dev_sectors && 3235b098636cSNeilBrown mddev->recovery_cp > mddev->dev_sectors) { 323658c0fed4SAndre Noll mddev->recovery_cp = mddev->dev_sectors; 32371da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 32381da177e4SLinus Torvalds } 3239b522adcdSDan Williams mddev->dev_sectors = sectors; 32404b5c7ae8SNeilBrown mddev->resync_max_sectors = sectors; 32411da177e4SLinus Torvalds return 0; 32421da177e4SLinus Torvalds } 32431da177e4SLinus Torvalds 3244fd01b88cSNeilBrown static int raid1_reshape(struct mddev *mddev) 32451da177e4SLinus Torvalds { 32461da177e4SLinus Torvalds /* We need to: 32471da177e4SLinus Torvalds * 1/ resize the r1bio_pool 32481da177e4SLinus Torvalds * 2/ resize conf->mirrors 32491da177e4SLinus Torvalds * 32501da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 32511da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 32521da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 32536ea9c07cSNeilBrown * 32546ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 32556ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 32561da177e4SLinus Torvalds */ 3257afeee514SKent Overstreet mempool_t newpool, oldpool; 32581da177e4SLinus Torvalds struct pool_info *newpoolinfo; 32590eaf822cSJonathan Brassow struct raid1_info *newmirrors; 3260e8096360SNeilBrown struct r1conf *conf = mddev->private; 326163c70c4fSNeilBrown int cnt, raid_disks; 3262c04be0aaSNeilBrown unsigned long flags; 32632214c260SArtur Paszkiewicz int d, d2; 3264afeee514SKent Overstreet int ret; 3265afeee514SKent Overstreet 3266afeee514SKent Overstreet memset(&newpool, 0, sizeof(newpool)); 3267afeee514SKent Overstreet memset(&oldpool, 0, sizeof(oldpool)); 32681da177e4SLinus Torvalds 326963c70c4fSNeilBrown /* Cannot change chunk_size, layout, or level */ 3270664e7c41SAndre Noll if (mddev->chunk_sectors != mddev->new_chunk_sectors || 327163c70c4fSNeilBrown mddev->layout != mddev->new_layout || 327263c70c4fSNeilBrown mddev->level != mddev->new_level) { 3273664e7c41SAndre Noll mddev->new_chunk_sectors = mddev->chunk_sectors; 327463c70c4fSNeilBrown mddev->new_layout = mddev->layout; 327563c70c4fSNeilBrown mddev->new_level = mddev->level; 327663c70c4fSNeilBrown return -EINVAL; 327763c70c4fSNeilBrown } 327863c70c4fSNeilBrown 32792214c260SArtur Paszkiewicz if (!mddev_is_clustered(mddev)) 32802214c260SArtur Paszkiewicz md_allow_write(mddev); 32812a2275d6SNeilBrown 328263c70c4fSNeilBrown raid_disks = mddev->raid_disks + mddev->delta_disks; 328363c70c4fSNeilBrown 32846ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 32856ea9c07cSNeilBrown cnt=0; 32866ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 32871da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 32886ea9c07cSNeilBrown cnt++; 32896ea9c07cSNeilBrown if (cnt > raid_disks) 32901da177e4SLinus Torvalds return -EBUSY; 32916ea9c07cSNeilBrown } 32921da177e4SLinus Torvalds 32931da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 32941da177e4SLinus Torvalds if (!newpoolinfo) 32951da177e4SLinus Torvalds return -ENOMEM; 32961da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 32978f19ccb2SNeilBrown newpoolinfo->raid_disks = raid_disks * 2; 32981da177e4SLinus Torvalds 32993f677f9cSMarcos Paulo de Souza ret = mempool_init(&newpool, NR_RAID_BIOS, r1bio_pool_alloc, 3300c7afa803SMarcos Paulo de Souza rbio_pool_free, newpoolinfo); 3301afeee514SKent Overstreet if (ret) { 33021da177e4SLinus Torvalds kfree(newpoolinfo); 3303afeee514SKent Overstreet return ret; 33041da177e4SLinus Torvalds } 33056396bb22SKees Cook newmirrors = kzalloc(array3_size(sizeof(struct raid1_info), 33066396bb22SKees Cook raid_disks, 2), 33078f19ccb2SNeilBrown GFP_KERNEL); 33081da177e4SLinus Torvalds if (!newmirrors) { 33091da177e4SLinus Torvalds kfree(newpoolinfo); 3310afeee514SKent Overstreet mempool_exit(&newpool); 33111da177e4SLinus Torvalds return -ENOMEM; 33121da177e4SLinus Torvalds } 33131da177e4SLinus Torvalds 3314e2d59925SNeilBrown freeze_array(conf, 0); 33151da177e4SLinus Torvalds 33161da177e4SLinus Torvalds /* ok, everything is stopped */ 33171da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 33181da177e4SLinus Torvalds conf->r1bio_pool = newpool; 33196ea9c07cSNeilBrown 3320a88aa786SNeilBrown for (d = d2 = 0; d < conf->raid_disks; d++) { 33213cb03002SNeilBrown struct md_rdev *rdev = conf->mirrors[d].rdev; 3322a88aa786SNeilBrown if (rdev && rdev->raid_disk != d2) { 332336fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 3324a88aa786SNeilBrown rdev->raid_disk = d2; 332536fad858SNamhyung Kim sysfs_unlink_rdev(mddev, rdev); 332636fad858SNamhyung Kim if (sysfs_link_rdev(mddev, rdev)) 33271d41c216SNeilBrown pr_warn("md/raid1:%s: cannot register rd%d\n", 332836fad858SNamhyung Kim mdname(mddev), rdev->raid_disk); 3329a88aa786SNeilBrown } 3330a88aa786SNeilBrown if (rdev) 3331a88aa786SNeilBrown newmirrors[d2++].rdev = rdev; 33326ea9c07cSNeilBrown } 33331da177e4SLinus Torvalds kfree(conf->mirrors); 33341da177e4SLinus Torvalds conf->mirrors = newmirrors; 33351da177e4SLinus Torvalds kfree(conf->poolinfo); 33361da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 33371da177e4SLinus Torvalds 3338c04be0aaSNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 33391da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 3340c04be0aaSNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 33411da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 334263c70c4fSNeilBrown mddev->delta_disks = 0; 33431da177e4SLinus Torvalds 3344e2d59925SNeilBrown unfreeze_array(conf); 33451da177e4SLinus Torvalds 3346985ca973SNeilBrown set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); 33471da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 33481da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 33491da177e4SLinus Torvalds 3350afeee514SKent Overstreet mempool_exit(&oldpool); 33511da177e4SLinus Torvalds return 0; 33521da177e4SLinus Torvalds } 33531da177e4SLinus Torvalds 3354b03e0ccbSNeilBrown static void raid1_quiesce(struct mddev *mddev, int quiesce) 335536fa3063SNeilBrown { 3356e8096360SNeilBrown struct r1conf *conf = mddev->private; 335736fa3063SNeilBrown 3358b03e0ccbSNeilBrown if (quiesce) 335907169fd4Smajianpeng freeze_array(conf, 0); 3360b03e0ccbSNeilBrown else 336107169fd4Smajianpeng unfreeze_array(conf); 336236fa3063SNeilBrown } 336336fa3063SNeilBrown 3364fd01b88cSNeilBrown static void *raid1_takeover(struct mddev *mddev) 3365709ae487SNeilBrown { 3366709ae487SNeilBrown /* raid1 can take over: 3367709ae487SNeilBrown * raid5 with 2 devices, any layout or chunk size 3368709ae487SNeilBrown */ 3369709ae487SNeilBrown if (mddev->level == 5 && mddev->raid_disks == 2) { 3370e8096360SNeilBrown struct r1conf *conf; 3371709ae487SNeilBrown mddev->new_level = 1; 3372709ae487SNeilBrown mddev->new_layout = 0; 3373709ae487SNeilBrown mddev->new_chunk_sectors = 0; 3374709ae487SNeilBrown conf = setup_conf(mddev); 33756995f0b2SShaohua Li if (!IS_ERR(conf)) { 337607169fd4Smajianpeng /* Array must appear to be quiesced */ 337707169fd4Smajianpeng conf->array_frozen = 1; 3378394ed8e4SShaohua Li mddev_clear_unsupported_flags(mddev, 3379394ed8e4SShaohua Li UNSUPPORTED_MDDEV_FLAGS); 33806995f0b2SShaohua Li } 3381709ae487SNeilBrown return conf; 3382709ae487SNeilBrown } 3383709ae487SNeilBrown return ERR_PTR(-EINVAL); 3384709ae487SNeilBrown } 33851da177e4SLinus Torvalds 338684fc4b56SNeilBrown static struct md_personality raid1_personality = 33871da177e4SLinus Torvalds { 33881da177e4SLinus Torvalds .name = "raid1", 33892604b703SNeilBrown .level = 1, 33901da177e4SLinus Torvalds .owner = THIS_MODULE, 3391849674e4SShaohua Li .make_request = raid1_make_request, 3392849674e4SShaohua Li .run = raid1_run, 3393afa0f557SNeilBrown .free = raid1_free, 3394849674e4SShaohua Li .status = raid1_status, 3395849674e4SShaohua Li .error_handler = raid1_error, 33961da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 33971da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 33981da177e4SLinus Torvalds .spare_active = raid1_spare_active, 3399849674e4SShaohua Li .sync_request = raid1_sync_request, 34001da177e4SLinus Torvalds .resize = raid1_resize, 340180c3a6ceSDan Williams .size = raid1_size, 340263c70c4fSNeilBrown .check_reshape = raid1_reshape, 340336fa3063SNeilBrown .quiesce = raid1_quiesce, 3404709ae487SNeilBrown .takeover = raid1_takeover, 34051da177e4SLinus Torvalds }; 34061da177e4SLinus Torvalds 34071da177e4SLinus Torvalds static int __init raid_init(void) 34081da177e4SLinus Torvalds { 34092604b703SNeilBrown return register_md_personality(&raid1_personality); 34101da177e4SLinus Torvalds } 34111da177e4SLinus Torvalds 34121da177e4SLinus Torvalds static void raid_exit(void) 34131da177e4SLinus Torvalds { 34142604b703SNeilBrown unregister_md_personality(&raid1_personality); 34151da177e4SLinus Torvalds } 34161da177e4SLinus Torvalds 34171da177e4SLinus Torvalds module_init(raid_init); 34181da177e4SLinus Torvalds module_exit(raid_exit); 34191da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 34200efb9e61SNeilBrown MODULE_DESCRIPTION("RAID1 (mirroring) personality for MD"); 34211da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 3422d9d166c2SNeilBrown MODULE_ALIAS("md-raid1"); 34232604b703SNeilBrown MODULE_ALIAS("md-level-1"); 3424