11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * raid1.c : Multiple Devices driver for Linux 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1999, 2000, 2001 Ingo Molnar, Red Hat 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 1996, 1997, 1998 Ingo Molnar, Miguel de Icaza, Gadi Oxman 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * RAID-1 management functions. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Better read-balancing code written by Mika Kuoppala <miku@iki.fi>, 2000 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Fixes to reconstruction by Jakob �stergaard" <jakob@ostenfeld.dk> 131da177e4SLinus Torvalds * Various fixes by Neil Brown <neilb@cse.unsw.edu.au> 141da177e4SLinus Torvalds * 15191ea9b2SNeilBrown * Changes by Peter T. Breuer <ptb@it.uc3m.es> 31/1/2003 to support 16191ea9b2SNeilBrown * bitmapped intelligence in resync: 17191ea9b2SNeilBrown * 18191ea9b2SNeilBrown * - bitmap marked during normal i/o 19191ea9b2SNeilBrown * - bitmap used to skip nondirty blocks during sync 20191ea9b2SNeilBrown * 21191ea9b2SNeilBrown * Additions to bitmap code, (C) 2003-2004 Paul Clements, SteelEye Technology: 22191ea9b2SNeilBrown * - persistent bitmap code 23191ea9b2SNeilBrown * 241da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 251da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 261da177e4SLinus Torvalds * the Free Software Foundation; either version 2, or (at your option) 271da177e4SLinus Torvalds * any later version. 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 301da177e4SLinus Torvalds * (for example /usr/src/linux/COPYING); if not, write to the Free 311da177e4SLinus Torvalds * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 321da177e4SLinus Torvalds */ 331da177e4SLinus Torvalds 34191ea9b2SNeilBrown #include "dm-bio-list.h" 351da177e4SLinus Torvalds #include <linux/raid/raid1.h> 36191ea9b2SNeilBrown #include <linux/raid/bitmap.h> 37191ea9b2SNeilBrown 38191ea9b2SNeilBrown #define DEBUG 0 39191ea9b2SNeilBrown #if DEBUG 40191ea9b2SNeilBrown #define PRINTK(x...) printk(x) 41191ea9b2SNeilBrown #else 42191ea9b2SNeilBrown #define PRINTK(x...) 43191ea9b2SNeilBrown #endif 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds /* 461da177e4SLinus Torvalds * Number of guaranteed r1bios in case of extreme VM load: 471da177e4SLinus Torvalds */ 481da177e4SLinus Torvalds #define NR_RAID1_BIOS 256 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds static mdk_personality_t raid1_personality; 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds static void unplug_slaves(mddev_t *mddev); 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds 551da177e4SLinus Torvalds static void * r1bio_pool_alloc(unsigned int __nocast gfp_flags, void *data) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds struct pool_info *pi = data; 581da177e4SLinus Torvalds r1bio_t *r1_bio; 591da177e4SLinus Torvalds int size = offsetof(r1bio_t, bios[pi->raid_disks]); 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds /* allocate a r1bio with room for raid_disks entries in the bios array */ 621da177e4SLinus Torvalds r1_bio = kmalloc(size, gfp_flags); 631da177e4SLinus Torvalds if (r1_bio) 641da177e4SLinus Torvalds memset(r1_bio, 0, size); 651da177e4SLinus Torvalds else 661da177e4SLinus Torvalds unplug_slaves(pi->mddev); 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds return r1_bio; 691da177e4SLinus Torvalds } 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds static void r1bio_pool_free(void *r1_bio, void *data) 721da177e4SLinus Torvalds { 731da177e4SLinus Torvalds kfree(r1_bio); 741da177e4SLinus Torvalds } 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds #define RESYNC_BLOCK_SIZE (64*1024) 771da177e4SLinus Torvalds //#define RESYNC_BLOCK_SIZE PAGE_SIZE 781da177e4SLinus Torvalds #define RESYNC_SECTORS (RESYNC_BLOCK_SIZE >> 9) 791da177e4SLinus Torvalds #define RESYNC_PAGES ((RESYNC_BLOCK_SIZE + PAGE_SIZE-1) / PAGE_SIZE) 801da177e4SLinus Torvalds #define RESYNC_WINDOW (2048*1024) 811da177e4SLinus Torvalds 821da177e4SLinus Torvalds static void * r1buf_pool_alloc(unsigned int __nocast gfp_flags, void *data) 831da177e4SLinus Torvalds { 841da177e4SLinus Torvalds struct pool_info *pi = data; 851da177e4SLinus Torvalds struct page *page; 861da177e4SLinus Torvalds r1bio_t *r1_bio; 871da177e4SLinus Torvalds struct bio *bio; 881da177e4SLinus Torvalds int i, j; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds r1_bio = r1bio_pool_alloc(gfp_flags, pi); 911da177e4SLinus Torvalds if (!r1_bio) { 921da177e4SLinus Torvalds unplug_slaves(pi->mddev); 931da177e4SLinus Torvalds return NULL; 941da177e4SLinus Torvalds } 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds /* 971da177e4SLinus Torvalds * Allocate bios : 1 for reading, n-1 for writing 981da177e4SLinus Torvalds */ 991da177e4SLinus Torvalds for (j = pi->raid_disks ; j-- ; ) { 1001da177e4SLinus Torvalds bio = bio_alloc(gfp_flags, RESYNC_PAGES); 1011da177e4SLinus Torvalds if (!bio) 1021da177e4SLinus Torvalds goto out_free_bio; 1031da177e4SLinus Torvalds r1_bio->bios[j] = bio; 1041da177e4SLinus Torvalds } 1051da177e4SLinus Torvalds /* 1061da177e4SLinus Torvalds * Allocate RESYNC_PAGES data pages and attach them to 1071da177e4SLinus Torvalds * the first bio; 1081da177e4SLinus Torvalds */ 1091da177e4SLinus Torvalds bio = r1_bio->bios[0]; 1101da177e4SLinus Torvalds for (i = 0; i < RESYNC_PAGES; i++) { 1111da177e4SLinus Torvalds page = alloc_page(gfp_flags); 1121da177e4SLinus Torvalds if (unlikely(!page)) 1131da177e4SLinus Torvalds goto out_free_pages; 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds bio->bi_io_vec[i].bv_page = page; 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds r1_bio->master_bio = NULL; 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds return r1_bio; 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds out_free_pages: 1231da177e4SLinus Torvalds for ( ; i > 0 ; i--) 1241da177e4SLinus Torvalds __free_page(bio->bi_io_vec[i-1].bv_page); 1251da177e4SLinus Torvalds out_free_bio: 1261da177e4SLinus Torvalds while ( ++j < pi->raid_disks ) 1271da177e4SLinus Torvalds bio_put(r1_bio->bios[j]); 1281da177e4SLinus Torvalds r1bio_pool_free(r1_bio, data); 1291da177e4SLinus Torvalds return NULL; 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds static void r1buf_pool_free(void *__r1_bio, void *data) 1331da177e4SLinus Torvalds { 1341da177e4SLinus Torvalds struct pool_info *pi = data; 1351da177e4SLinus Torvalds int i; 1361da177e4SLinus Torvalds r1bio_t *r1bio = __r1_bio; 1371da177e4SLinus Torvalds struct bio *bio = r1bio->bios[0]; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds for (i = 0; i < RESYNC_PAGES; i++) { 1401da177e4SLinus Torvalds __free_page(bio->bi_io_vec[i].bv_page); 1411da177e4SLinus Torvalds bio->bi_io_vec[i].bv_page = NULL; 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds for (i=0 ; i < pi->raid_disks; i++) 1441da177e4SLinus Torvalds bio_put(r1bio->bios[i]); 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds r1bio_pool_free(r1bio, data); 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds static void put_all_bios(conf_t *conf, r1bio_t *r1_bio) 1501da177e4SLinus Torvalds { 1511da177e4SLinus Torvalds int i; 1521da177e4SLinus Torvalds 1531da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 1541da177e4SLinus Torvalds struct bio **bio = r1_bio->bios + i; 1551da177e4SLinus Torvalds if (*bio) 1561da177e4SLinus Torvalds bio_put(*bio); 1571da177e4SLinus Torvalds *bio = NULL; 1581da177e4SLinus Torvalds } 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds static inline void free_r1bio(r1bio_t *r1_bio) 1621da177e4SLinus Torvalds { 1631da177e4SLinus Torvalds unsigned long flags; 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(r1_bio->mddev); 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds /* 1681da177e4SLinus Torvalds * Wake up any possible resync thread that waits for the device 1691da177e4SLinus Torvalds * to go idle. 1701da177e4SLinus Torvalds */ 1711da177e4SLinus Torvalds spin_lock_irqsave(&conf->resync_lock, flags); 1721da177e4SLinus Torvalds if (!--conf->nr_pending) { 1731da177e4SLinus Torvalds wake_up(&conf->wait_idle); 1741da177e4SLinus Torvalds wake_up(&conf->wait_resume); 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->resync_lock, flags); 1771da177e4SLinus Torvalds 1781da177e4SLinus Torvalds put_all_bios(conf, r1_bio); 1791da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1bio_pool); 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds static inline void put_buf(r1bio_t *r1_bio) 1831da177e4SLinus Torvalds { 1841da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(r1_bio->mddev); 1851da177e4SLinus Torvalds unsigned long flags; 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvalds mempool_free(r1_bio, conf->r1buf_pool); 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds spin_lock_irqsave(&conf->resync_lock, flags); 1901da177e4SLinus Torvalds if (!conf->barrier) 1911da177e4SLinus Torvalds BUG(); 1921da177e4SLinus Torvalds --conf->barrier; 1931da177e4SLinus Torvalds wake_up(&conf->wait_resume); 1941da177e4SLinus Torvalds wake_up(&conf->wait_idle); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds if (!--conf->nr_pending) { 1971da177e4SLinus Torvalds wake_up(&conf->wait_idle); 1981da177e4SLinus Torvalds wake_up(&conf->wait_resume); 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->resync_lock, flags); 2011da177e4SLinus Torvalds } 2021da177e4SLinus Torvalds 2031da177e4SLinus Torvalds static void reschedule_retry(r1bio_t *r1_bio) 2041da177e4SLinus Torvalds { 2051da177e4SLinus Torvalds unsigned long flags; 2061da177e4SLinus Torvalds mddev_t *mddev = r1_bio->mddev; 2071da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 2101da177e4SLinus Torvalds list_add(&r1_bio->retry_list, &conf->retry_list); 2111da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 2121da177e4SLinus Torvalds 2131da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 2141da177e4SLinus Torvalds } 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds /* 2171da177e4SLinus Torvalds * raid_end_bio_io() is called when we have finished servicing a mirrored 2181da177e4SLinus Torvalds * operation and are ready to return a success/failure code to the buffer 2191da177e4SLinus Torvalds * cache layer. 2201da177e4SLinus Torvalds */ 2211da177e4SLinus Torvalds static void raid_end_bio_io(r1bio_t *r1_bio) 2221da177e4SLinus Torvalds { 2231da177e4SLinus Torvalds struct bio *bio = r1_bio->master_bio; 2241da177e4SLinus Torvalds 2251da177e4SLinus Torvalds bio_endio(bio, bio->bi_size, 2261da177e4SLinus Torvalds test_bit(R1BIO_Uptodate, &r1_bio->state) ? 0 : -EIO); 2271da177e4SLinus Torvalds free_r1bio(r1_bio); 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds /* 2311da177e4SLinus Torvalds * Update disk head position estimator based on IRQ completion info. 2321da177e4SLinus Torvalds */ 2331da177e4SLinus Torvalds static inline void update_head_pos(int disk, r1bio_t *r1_bio) 2341da177e4SLinus Torvalds { 2351da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(r1_bio->mddev); 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds conf->mirrors[disk].head_position = 2381da177e4SLinus Torvalds r1_bio->sector + (r1_bio->sectors); 2391da177e4SLinus Torvalds } 2401da177e4SLinus Torvalds 2411da177e4SLinus Torvalds static int raid1_end_read_request(struct bio *bio, unsigned int bytes_done, int error) 2421da177e4SLinus Torvalds { 2431da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 2441da177e4SLinus Torvalds r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); 2451da177e4SLinus Torvalds int mirror; 2461da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(r1_bio->mddev); 2471da177e4SLinus Torvalds 2481da177e4SLinus Torvalds if (bio->bi_size) 2491da177e4SLinus Torvalds return 1; 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds mirror = r1_bio->read_disk; 2521da177e4SLinus Torvalds /* 2531da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 2541da177e4SLinus Torvalds */ 2551da177e4SLinus Torvalds if (!uptodate) 2561da177e4SLinus Torvalds md_error(r1_bio->mddev, conf->mirrors[mirror].rdev); 2571da177e4SLinus Torvalds else 2581da177e4SLinus Torvalds /* 2591da177e4SLinus Torvalds * Set R1BIO_Uptodate in our master bio, so that 2601da177e4SLinus Torvalds * we will return a good error code for to the higher 2611da177e4SLinus Torvalds * levels even if IO on some other mirrored buffer fails. 2621da177e4SLinus Torvalds * 2631da177e4SLinus Torvalds * The 'master' represents the composite IO operation to 2641da177e4SLinus Torvalds * user-side. So if something waits for IO, then it will 2651da177e4SLinus Torvalds * wait for the 'master' bio. 2661da177e4SLinus Torvalds */ 2671da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvalds update_head_pos(mirror, r1_bio); 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds /* 2721da177e4SLinus Torvalds * we have only one bio on the read side 2731da177e4SLinus Torvalds */ 2741da177e4SLinus Torvalds if (uptodate) 2751da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 2761da177e4SLinus Torvalds else { 2771da177e4SLinus Torvalds /* 2781da177e4SLinus Torvalds * oops, read error: 2791da177e4SLinus Torvalds */ 2801da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 2811da177e4SLinus Torvalds if (printk_ratelimit()) 2821da177e4SLinus Torvalds printk(KERN_ERR "raid1: %s: rescheduling sector %llu\n", 2831da177e4SLinus Torvalds bdevname(conf->mirrors[mirror].rdev->bdev,b), (unsigned long long)r1_bio->sector); 2841da177e4SLinus Torvalds reschedule_retry(r1_bio); 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); 2881da177e4SLinus Torvalds return 0; 2891da177e4SLinus Torvalds } 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvalds static int raid1_end_write_request(struct bio *bio, unsigned int bytes_done, int error) 2921da177e4SLinus Torvalds { 2931da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 2941da177e4SLinus Torvalds r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); 2951da177e4SLinus Torvalds int mirror; 2961da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(r1_bio->mddev); 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvalds if (bio->bi_size) 2991da177e4SLinus Torvalds return 1; 3001da177e4SLinus Torvalds 3011da177e4SLinus Torvalds for (mirror = 0; mirror < conf->raid_disks; mirror++) 3021da177e4SLinus Torvalds if (r1_bio->bios[mirror] == bio) 3031da177e4SLinus Torvalds break; 3041da177e4SLinus Torvalds 3051da177e4SLinus Torvalds /* 3061da177e4SLinus Torvalds * this branch is our 'one mirror IO has finished' event handler: 3071da177e4SLinus Torvalds */ 308191ea9b2SNeilBrown if (!uptodate) { 3091da177e4SLinus Torvalds md_error(r1_bio->mddev, conf->mirrors[mirror].rdev); 310191ea9b2SNeilBrown /* an I/O failed, we can't clear the bitmap */ 311191ea9b2SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 312191ea9b2SNeilBrown } else 3131da177e4SLinus Torvalds /* 3141da177e4SLinus Torvalds * Set R1BIO_Uptodate in our master bio, so that 3151da177e4SLinus Torvalds * we will return a good error code for to the higher 3161da177e4SLinus Torvalds * levels even if IO on some other mirrored buffer fails. 3171da177e4SLinus Torvalds * 3181da177e4SLinus Torvalds * The 'master' represents the composite IO operation to 3191da177e4SLinus Torvalds * user-side. So if something waits for IO, then it will 3201da177e4SLinus Torvalds * wait for the 'master' bio. 3211da177e4SLinus Torvalds */ 3221da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds update_head_pos(mirror, r1_bio); 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvalds /* 3271da177e4SLinus Torvalds * 3281da177e4SLinus Torvalds * Let's see if all mirrored write operations have finished 3291da177e4SLinus Torvalds * already. 3301da177e4SLinus Torvalds */ 3311da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 332191ea9b2SNeilBrown /* clear the bitmap if all writes complete successfully */ 333191ea9b2SNeilBrown bitmap_endwrite(r1_bio->mddev->bitmap, r1_bio->sector, 334191ea9b2SNeilBrown r1_bio->sectors, 335191ea9b2SNeilBrown !test_bit(R1BIO_Degraded, &r1_bio->state)); 3361da177e4SLinus Torvalds md_write_end(r1_bio->mddev); 3371da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 3381da177e4SLinus Torvalds } 3391da177e4SLinus Torvalds 3401da177e4SLinus Torvalds rdev_dec_pending(conf->mirrors[mirror].rdev, conf->mddev); 3411da177e4SLinus Torvalds return 0; 3421da177e4SLinus Torvalds } 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds /* 3461da177e4SLinus Torvalds * This routine returns the disk from which the requested read should 3471da177e4SLinus Torvalds * be done. There is a per-array 'next expected sequential IO' sector 3481da177e4SLinus Torvalds * number - if this matches on the next IO then we use the last disk. 3491da177e4SLinus Torvalds * There is also a per-disk 'last know head position' sector that is 3501da177e4SLinus Torvalds * maintained from IRQ contexts, both the normal and the resync IO 3511da177e4SLinus Torvalds * completion handlers update this position correctly. If there is no 3521da177e4SLinus Torvalds * perfect sequential match then we pick the disk whose head is closest. 3531da177e4SLinus Torvalds * 3541da177e4SLinus Torvalds * If there are 2 mirrors in the same 2 devices, performance degrades 3551da177e4SLinus Torvalds * because position is mirror, not device based. 3561da177e4SLinus Torvalds * 3571da177e4SLinus Torvalds * The rdev for the device selected will have nr_pending incremented. 3581da177e4SLinus Torvalds */ 3591da177e4SLinus Torvalds static int read_balance(conf_t *conf, r1bio_t *r1_bio) 3601da177e4SLinus Torvalds { 3611da177e4SLinus Torvalds const unsigned long this_sector = r1_bio->sector; 3621da177e4SLinus Torvalds int new_disk = conf->last_used, disk = new_disk; 3631da177e4SLinus Torvalds const int sectors = r1_bio->sectors; 3641da177e4SLinus Torvalds sector_t new_distance, current_distance; 3651da177e4SLinus Torvalds mdk_rdev_t *new_rdev, *rdev; 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvalds rcu_read_lock(); 3681da177e4SLinus Torvalds /* 3691da177e4SLinus Torvalds * Check if it if we can balance. We can balance on the whole 3701da177e4SLinus Torvalds * device if no resync is going on, or below the resync window. 3711da177e4SLinus Torvalds * We take the first readable disk when above the resync window. 3721da177e4SLinus Torvalds */ 3731da177e4SLinus Torvalds retry: 3741da177e4SLinus Torvalds if (conf->mddev->recovery_cp < MaxSector && 3751da177e4SLinus Torvalds (this_sector + sectors >= conf->next_resync)) { 3761da177e4SLinus Torvalds /* Choose the first operation device, for consistancy */ 3771da177e4SLinus Torvalds new_disk = 0; 3781da177e4SLinus Torvalds 3791da177e4SLinus Torvalds while ((new_rdev=conf->mirrors[new_disk].rdev) == NULL || 3801da177e4SLinus Torvalds !new_rdev->in_sync) { 3811da177e4SLinus Torvalds new_disk++; 3821da177e4SLinus Torvalds if (new_disk == conf->raid_disks) { 3831da177e4SLinus Torvalds new_disk = -1; 3841da177e4SLinus Torvalds break; 3851da177e4SLinus Torvalds } 3861da177e4SLinus Torvalds } 3871da177e4SLinus Torvalds goto rb_out; 3881da177e4SLinus Torvalds } 3891da177e4SLinus Torvalds 3901da177e4SLinus Torvalds 3911da177e4SLinus Torvalds /* make sure the disk is operational */ 3921da177e4SLinus Torvalds while ((new_rdev=conf->mirrors[new_disk].rdev) == NULL || 3931da177e4SLinus Torvalds !new_rdev->in_sync) { 3941da177e4SLinus Torvalds if (new_disk <= 0) 3951da177e4SLinus Torvalds new_disk = conf->raid_disks; 3961da177e4SLinus Torvalds new_disk--; 3971da177e4SLinus Torvalds if (new_disk == disk) { 3981da177e4SLinus Torvalds new_disk = -1; 3991da177e4SLinus Torvalds goto rb_out; 4001da177e4SLinus Torvalds } 4011da177e4SLinus Torvalds } 4021da177e4SLinus Torvalds disk = new_disk; 4031da177e4SLinus Torvalds /* now disk == new_disk == starting point for search */ 4041da177e4SLinus Torvalds 4051da177e4SLinus Torvalds /* 4061da177e4SLinus Torvalds * Don't change to another disk for sequential reads: 4071da177e4SLinus Torvalds */ 4081da177e4SLinus Torvalds if (conf->next_seq_sect == this_sector) 4091da177e4SLinus Torvalds goto rb_out; 4101da177e4SLinus Torvalds if (this_sector == conf->mirrors[new_disk].head_position) 4111da177e4SLinus Torvalds goto rb_out; 4121da177e4SLinus Torvalds 4131da177e4SLinus Torvalds current_distance = abs(this_sector - conf->mirrors[disk].head_position); 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds /* Find the disk whose head is closest */ 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds do { 4181da177e4SLinus Torvalds if (disk <= 0) 4191da177e4SLinus Torvalds disk = conf->raid_disks; 4201da177e4SLinus Torvalds disk--; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds if ((rdev=conf->mirrors[disk].rdev) == NULL || 4231da177e4SLinus Torvalds !rdev->in_sync) 4241da177e4SLinus Torvalds continue; 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds if (!atomic_read(&rdev->nr_pending)) { 4271da177e4SLinus Torvalds new_disk = disk; 4281da177e4SLinus Torvalds new_rdev = rdev; 4291da177e4SLinus Torvalds break; 4301da177e4SLinus Torvalds } 4311da177e4SLinus Torvalds new_distance = abs(this_sector - conf->mirrors[disk].head_position); 4321da177e4SLinus Torvalds if (new_distance < current_distance) { 4331da177e4SLinus Torvalds current_distance = new_distance; 4341da177e4SLinus Torvalds new_disk = disk; 4351da177e4SLinus Torvalds new_rdev = rdev; 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds } while (disk != conf->last_used); 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds rb_out: 4401da177e4SLinus Torvalds 4411da177e4SLinus Torvalds 4421da177e4SLinus Torvalds if (new_disk >= 0) { 4431da177e4SLinus Torvalds conf->next_seq_sect = this_sector + sectors; 4441da177e4SLinus Torvalds conf->last_used = new_disk; 4451da177e4SLinus Torvalds atomic_inc(&new_rdev->nr_pending); 4461da177e4SLinus Torvalds if (!new_rdev->in_sync) { 4471da177e4SLinus Torvalds /* cannot risk returning a device that failed 4481da177e4SLinus Torvalds * before we inc'ed nr_pending 4491da177e4SLinus Torvalds */ 4501da177e4SLinus Torvalds atomic_dec(&new_rdev->nr_pending); 4511da177e4SLinus Torvalds goto retry; 4521da177e4SLinus Torvalds } 4531da177e4SLinus Torvalds } 4541da177e4SLinus Torvalds rcu_read_unlock(); 4551da177e4SLinus Torvalds 4561da177e4SLinus Torvalds return new_disk; 4571da177e4SLinus Torvalds } 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds static void unplug_slaves(mddev_t *mddev) 4601da177e4SLinus Torvalds { 4611da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 4621da177e4SLinus Torvalds int i; 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds rcu_read_lock(); 4651da177e4SLinus Torvalds for (i=0; i<mddev->raid_disks; i++) { 4661da177e4SLinus Torvalds mdk_rdev_t *rdev = conf->mirrors[i].rdev; 4671da177e4SLinus Torvalds if (rdev && !rdev->faulty && atomic_read(&rdev->nr_pending)) { 4681da177e4SLinus Torvalds request_queue_t *r_queue = bdev_get_queue(rdev->bdev); 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds atomic_inc(&rdev->nr_pending); 4711da177e4SLinus Torvalds rcu_read_unlock(); 4721da177e4SLinus Torvalds 4731da177e4SLinus Torvalds if (r_queue->unplug_fn) 4741da177e4SLinus Torvalds r_queue->unplug_fn(r_queue); 4751da177e4SLinus Torvalds 4761da177e4SLinus Torvalds rdev_dec_pending(rdev, mddev); 4771da177e4SLinus Torvalds rcu_read_lock(); 4781da177e4SLinus Torvalds } 4791da177e4SLinus Torvalds } 4801da177e4SLinus Torvalds rcu_read_unlock(); 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds static void raid1_unplug(request_queue_t *q) 4841da177e4SLinus Torvalds { 485191ea9b2SNeilBrown mddev_t *mddev = q->queuedata; 486191ea9b2SNeilBrown 487191ea9b2SNeilBrown unplug_slaves(mddev); 488191ea9b2SNeilBrown md_wakeup_thread(mddev->thread); 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds static int raid1_issue_flush(request_queue_t *q, struct gendisk *disk, 4921da177e4SLinus Torvalds sector_t *error_sector) 4931da177e4SLinus Torvalds { 4941da177e4SLinus Torvalds mddev_t *mddev = q->queuedata; 4951da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 4961da177e4SLinus Torvalds int i, ret = 0; 4971da177e4SLinus Torvalds 4981da177e4SLinus Torvalds rcu_read_lock(); 4991da177e4SLinus Torvalds for (i=0; i<mddev->raid_disks && ret == 0; i++) { 5001da177e4SLinus Torvalds mdk_rdev_t *rdev = conf->mirrors[i].rdev; 5011da177e4SLinus Torvalds if (rdev && !rdev->faulty) { 5021da177e4SLinus Torvalds struct block_device *bdev = rdev->bdev; 5031da177e4SLinus Torvalds request_queue_t *r_queue = bdev_get_queue(bdev); 5041da177e4SLinus Torvalds 5051da177e4SLinus Torvalds if (!r_queue->issue_flush_fn) 5061da177e4SLinus Torvalds ret = -EOPNOTSUPP; 5071da177e4SLinus Torvalds else { 5081da177e4SLinus Torvalds atomic_inc(&rdev->nr_pending); 5091da177e4SLinus Torvalds rcu_read_unlock(); 5101da177e4SLinus Torvalds ret = r_queue->issue_flush_fn(r_queue, bdev->bd_disk, 5111da177e4SLinus Torvalds error_sector); 5121da177e4SLinus Torvalds rdev_dec_pending(rdev, mddev); 5131da177e4SLinus Torvalds rcu_read_lock(); 5141da177e4SLinus Torvalds } 5151da177e4SLinus Torvalds } 5161da177e4SLinus Torvalds } 5171da177e4SLinus Torvalds rcu_read_unlock(); 5181da177e4SLinus Torvalds return ret; 5191da177e4SLinus Torvalds } 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds /* 5221da177e4SLinus Torvalds * Throttle resync depth, so that we can both get proper overlapping of 5231da177e4SLinus Torvalds * requests, but are still able to handle normal requests quickly. 5241da177e4SLinus Torvalds */ 5251da177e4SLinus Torvalds #define RESYNC_DEPTH 32 5261da177e4SLinus Torvalds 5271da177e4SLinus Torvalds static void device_barrier(conf_t *conf, sector_t sect) 5281da177e4SLinus Torvalds { 5291da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 5301da177e4SLinus Torvalds wait_event_lock_irq(conf->wait_idle, !waitqueue_active(&conf->wait_resume), 531191ea9b2SNeilBrown conf->resync_lock, raid1_unplug(conf->mddev->queue)); 5321da177e4SLinus Torvalds 5331da177e4SLinus Torvalds if (!conf->barrier++) { 5341da177e4SLinus Torvalds wait_event_lock_irq(conf->wait_idle, !conf->nr_pending, 535191ea9b2SNeilBrown conf->resync_lock, raid1_unplug(conf->mddev->queue)); 5361da177e4SLinus Torvalds if (conf->nr_pending) 5371da177e4SLinus Torvalds BUG(); 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds wait_event_lock_irq(conf->wait_resume, conf->barrier < RESYNC_DEPTH, 540191ea9b2SNeilBrown conf->resync_lock, raid1_unplug(conf->mddev->queue)); 5411da177e4SLinus Torvalds conf->next_resync = sect; 5421da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 5431da177e4SLinus Torvalds } 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds static int make_request(request_queue_t *q, struct bio * bio) 5461da177e4SLinus Torvalds { 5471da177e4SLinus Torvalds mddev_t *mddev = q->queuedata; 5481da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 5491da177e4SLinus Torvalds mirror_info_t *mirror; 5501da177e4SLinus Torvalds r1bio_t *r1_bio; 5511da177e4SLinus Torvalds struct bio *read_bio; 552191ea9b2SNeilBrown int i, targets = 0, disks; 5531da177e4SLinus Torvalds mdk_rdev_t *rdev; 554191ea9b2SNeilBrown struct bitmap *bitmap = mddev->bitmap; 555191ea9b2SNeilBrown unsigned long flags; 556191ea9b2SNeilBrown struct bio_list bl; 557191ea9b2SNeilBrown 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds /* 5601da177e4SLinus Torvalds * Register the new request and wait if the reconstruction 5611da177e4SLinus Torvalds * thread has put up a bar for new requests. 5621da177e4SLinus Torvalds * Continue immediately if no resync is active currently. 5631da177e4SLinus Torvalds */ 56406d91a5fSNeilBrown if (md_write_start(mddev, bio)==0) 56506d91a5fSNeilBrown return 0; 5661da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 5671da177e4SLinus Torvalds wait_event_lock_irq(conf->wait_resume, !conf->barrier, conf->resync_lock, ); 5681da177e4SLinus Torvalds conf->nr_pending++; 5691da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 5701da177e4SLinus Torvalds 5711da177e4SLinus Torvalds if (bio_data_dir(bio)==WRITE) { 5721da177e4SLinus Torvalds disk_stat_inc(mddev->gendisk, writes); 5731da177e4SLinus Torvalds disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio)); 5741da177e4SLinus Torvalds } else { 5751da177e4SLinus Torvalds disk_stat_inc(mddev->gendisk, reads); 5761da177e4SLinus Torvalds disk_stat_add(mddev->gendisk, read_sectors, bio_sectors(bio)); 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds /* 5801da177e4SLinus Torvalds * make_request() can abort the operation when READA is being 5811da177e4SLinus Torvalds * used and no empty request is available. 5821da177e4SLinus Torvalds * 5831da177e4SLinus Torvalds */ 5841da177e4SLinus Torvalds r1_bio = mempool_alloc(conf->r1bio_pool, GFP_NOIO); 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds r1_bio->master_bio = bio; 5871da177e4SLinus Torvalds r1_bio->sectors = bio->bi_size >> 9; 588191ea9b2SNeilBrown r1_bio->state = 0; 5891da177e4SLinus Torvalds r1_bio->mddev = mddev; 5901da177e4SLinus Torvalds r1_bio->sector = bio->bi_sector; 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds r1_bio->state = 0; 5931da177e4SLinus Torvalds 5941da177e4SLinus Torvalds if (bio_data_dir(bio) == READ) { 5951da177e4SLinus Torvalds /* 5961da177e4SLinus Torvalds * read balancing logic: 5971da177e4SLinus Torvalds */ 5981da177e4SLinus Torvalds int rdisk = read_balance(conf, r1_bio); 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvalds if (rdisk < 0) { 6011da177e4SLinus Torvalds /* couldn't find anywhere to read from */ 6021da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 6031da177e4SLinus Torvalds return 0; 6041da177e4SLinus Torvalds } 6051da177e4SLinus Torvalds mirror = conf->mirrors + rdisk; 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds r1_bio->read_disk = rdisk; 6081da177e4SLinus Torvalds 6091da177e4SLinus Torvalds read_bio = bio_clone(bio, GFP_NOIO); 6101da177e4SLinus Torvalds 6111da177e4SLinus Torvalds r1_bio->bios[rdisk] = read_bio; 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds read_bio->bi_sector = r1_bio->sector + mirror->rdev->data_offset; 6141da177e4SLinus Torvalds read_bio->bi_bdev = mirror->rdev->bdev; 6151da177e4SLinus Torvalds read_bio->bi_end_io = raid1_end_read_request; 6161da177e4SLinus Torvalds read_bio->bi_rw = READ; 6171da177e4SLinus Torvalds read_bio->bi_private = r1_bio; 6181da177e4SLinus Torvalds 6191da177e4SLinus Torvalds generic_make_request(read_bio); 6201da177e4SLinus Torvalds return 0; 6211da177e4SLinus Torvalds } 6221da177e4SLinus Torvalds 6231da177e4SLinus Torvalds /* 6241da177e4SLinus Torvalds * WRITE: 6251da177e4SLinus Torvalds */ 6261da177e4SLinus Torvalds /* first select target devices under spinlock and 6271da177e4SLinus Torvalds * inc refcount on their rdev. Record them by setting 6281da177e4SLinus Torvalds * bios[x] to bio 6291da177e4SLinus Torvalds */ 6301da177e4SLinus Torvalds disks = conf->raid_disks; 631191ea9b2SNeilBrown #if 0 632191ea9b2SNeilBrown { static int first=1; 633191ea9b2SNeilBrown if (first) printk("First Write sector %llu disks %d\n", 634191ea9b2SNeilBrown (unsigned long long)r1_bio->sector, disks); 635191ea9b2SNeilBrown first = 0; 636191ea9b2SNeilBrown } 637191ea9b2SNeilBrown #endif 6381da177e4SLinus Torvalds rcu_read_lock(); 6391da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 6401da177e4SLinus Torvalds if ((rdev=conf->mirrors[i].rdev) != NULL && 6411da177e4SLinus Torvalds !rdev->faulty) { 6421da177e4SLinus Torvalds atomic_inc(&rdev->nr_pending); 6431da177e4SLinus Torvalds if (rdev->faulty) { 6441da177e4SLinus Torvalds atomic_dec(&rdev->nr_pending); 6451da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 6461da177e4SLinus Torvalds } else 6471da177e4SLinus Torvalds r1_bio->bios[i] = bio; 648191ea9b2SNeilBrown targets++; 6491da177e4SLinus Torvalds } else 6501da177e4SLinus Torvalds r1_bio->bios[i] = NULL; 6511da177e4SLinus Torvalds } 6521da177e4SLinus Torvalds rcu_read_unlock(); 6531da177e4SLinus Torvalds 654191ea9b2SNeilBrown if (targets < conf->raid_disks) { 655191ea9b2SNeilBrown /* array is degraded, we will not clear the bitmap 656191ea9b2SNeilBrown * on I/O completion (see raid1_end_write_request) */ 657191ea9b2SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 658191ea9b2SNeilBrown } 65906d91a5fSNeilBrown 660191ea9b2SNeilBrown atomic_set(&r1_bio->remaining, 0); 661191ea9b2SNeilBrown 662191ea9b2SNeilBrown bio_list_init(&bl); 6631da177e4SLinus Torvalds for (i = 0; i < disks; i++) { 6641da177e4SLinus Torvalds struct bio *mbio; 6651da177e4SLinus Torvalds if (!r1_bio->bios[i]) 6661da177e4SLinus Torvalds continue; 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds mbio = bio_clone(bio, GFP_NOIO); 6691da177e4SLinus Torvalds r1_bio->bios[i] = mbio; 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds mbio->bi_sector = r1_bio->sector + conf->mirrors[i].rdev->data_offset; 6721da177e4SLinus Torvalds mbio->bi_bdev = conf->mirrors[i].rdev->bdev; 6731da177e4SLinus Torvalds mbio->bi_end_io = raid1_end_write_request; 6741da177e4SLinus Torvalds mbio->bi_rw = WRITE; 6751da177e4SLinus Torvalds mbio->bi_private = r1_bio; 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 678191ea9b2SNeilBrown 679191ea9b2SNeilBrown bio_list_add(&bl, mbio); 6801da177e4SLinus Torvalds } 6811da177e4SLinus Torvalds 682191ea9b2SNeilBrown bitmap_startwrite(bitmap, bio->bi_sector, r1_bio->sectors); 683191ea9b2SNeilBrown spin_lock_irqsave(&conf->device_lock, flags); 684191ea9b2SNeilBrown bio_list_merge(&conf->pending_bio_list, &bl); 685191ea9b2SNeilBrown bio_list_init(&bl); 686191ea9b2SNeilBrown 687191ea9b2SNeilBrown blk_plug_device(mddev->queue); 688191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 689191ea9b2SNeilBrown 690191ea9b2SNeilBrown #if 0 691191ea9b2SNeilBrown while ((bio = bio_list_pop(&bl)) != NULL) 692191ea9b2SNeilBrown generic_make_request(bio); 693191ea9b2SNeilBrown #endif 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds return 0; 6961da177e4SLinus Torvalds } 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds static void status(struct seq_file *seq, mddev_t *mddev) 6991da177e4SLinus Torvalds { 7001da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 7011da177e4SLinus Torvalds int i; 7021da177e4SLinus Torvalds 7031da177e4SLinus Torvalds seq_printf(seq, " [%d/%d] [", conf->raid_disks, 7041da177e4SLinus Torvalds conf->working_disks); 7051da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) 7061da177e4SLinus Torvalds seq_printf(seq, "%s", 7071da177e4SLinus Torvalds conf->mirrors[i].rdev && 7081da177e4SLinus Torvalds conf->mirrors[i].rdev->in_sync ? "U" : "_"); 7091da177e4SLinus Torvalds seq_printf(seq, "]"); 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds static void error(mddev_t *mddev, mdk_rdev_t *rdev) 7141da177e4SLinus Torvalds { 7151da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 7161da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds /* 7191da177e4SLinus Torvalds * If it is not operational, then we have already marked it as dead 7201da177e4SLinus Torvalds * else if it is the last working disks, ignore the error, let the 7211da177e4SLinus Torvalds * next level up know. 7221da177e4SLinus Torvalds * else mark the drive as failed 7231da177e4SLinus Torvalds */ 7241da177e4SLinus Torvalds if (rdev->in_sync 7251da177e4SLinus Torvalds && conf->working_disks == 1) 7261da177e4SLinus Torvalds /* 7271da177e4SLinus Torvalds * Don't fail the drive, act as though we were just a 7281da177e4SLinus Torvalds * normal single drive 7291da177e4SLinus Torvalds */ 7301da177e4SLinus Torvalds return; 7311da177e4SLinus Torvalds if (rdev->in_sync) { 7321da177e4SLinus Torvalds mddev->degraded++; 7331da177e4SLinus Torvalds conf->working_disks--; 7341da177e4SLinus Torvalds /* 7351da177e4SLinus Torvalds * if recovery is running, make sure it aborts. 7361da177e4SLinus Torvalds */ 7371da177e4SLinus Torvalds set_bit(MD_RECOVERY_ERR, &mddev->recovery); 7381da177e4SLinus Torvalds } 7391da177e4SLinus Torvalds rdev->in_sync = 0; 7401da177e4SLinus Torvalds rdev->faulty = 1; 7411da177e4SLinus Torvalds mddev->sb_dirty = 1; 7421da177e4SLinus Torvalds printk(KERN_ALERT "raid1: Disk failure on %s, disabling device. \n" 7431da177e4SLinus Torvalds " Operation continuing on %d devices\n", 7441da177e4SLinus Torvalds bdevname(rdev->bdev,b), conf->working_disks); 7451da177e4SLinus Torvalds } 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds static void print_conf(conf_t *conf) 7481da177e4SLinus Torvalds { 7491da177e4SLinus Torvalds int i; 7501da177e4SLinus Torvalds mirror_info_t *tmp; 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds printk("RAID1 conf printout:\n"); 7531da177e4SLinus Torvalds if (!conf) { 7541da177e4SLinus Torvalds printk("(!conf)\n"); 7551da177e4SLinus Torvalds return; 7561da177e4SLinus Torvalds } 7571da177e4SLinus Torvalds printk(" --- wd:%d rd:%d\n", conf->working_disks, 7581da177e4SLinus Torvalds conf->raid_disks); 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 7611da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 7621da177e4SLinus Torvalds tmp = conf->mirrors + i; 7631da177e4SLinus Torvalds if (tmp->rdev) 7641da177e4SLinus Torvalds printk(" disk %d, wo:%d, o:%d, dev:%s\n", 7651da177e4SLinus Torvalds i, !tmp->rdev->in_sync, !tmp->rdev->faulty, 7661da177e4SLinus Torvalds bdevname(tmp->rdev->bdev,b)); 7671da177e4SLinus Torvalds } 7681da177e4SLinus Torvalds } 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvalds static void close_sync(conf_t *conf) 7711da177e4SLinus Torvalds { 7721da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 7731da177e4SLinus Torvalds wait_event_lock_irq(conf->wait_resume, !conf->barrier, 774191ea9b2SNeilBrown conf->resync_lock, raid1_unplug(conf->mddev->queue)); 7751da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds if (conf->barrier) BUG(); 7781da177e4SLinus Torvalds if (waitqueue_active(&conf->wait_idle)) BUG(); 7791da177e4SLinus Torvalds 7801da177e4SLinus Torvalds mempool_destroy(conf->r1buf_pool); 7811da177e4SLinus Torvalds conf->r1buf_pool = NULL; 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvalds static int raid1_spare_active(mddev_t *mddev) 7851da177e4SLinus Torvalds { 7861da177e4SLinus Torvalds int i; 7871da177e4SLinus Torvalds conf_t *conf = mddev->private; 7881da177e4SLinus Torvalds mirror_info_t *tmp; 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvalds /* 7911da177e4SLinus Torvalds * Find all failed disks within the RAID1 configuration 7921da177e4SLinus Torvalds * and mark them readable 7931da177e4SLinus Torvalds */ 7941da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 7951da177e4SLinus Torvalds tmp = conf->mirrors + i; 7961da177e4SLinus Torvalds if (tmp->rdev 7971da177e4SLinus Torvalds && !tmp->rdev->faulty 7981da177e4SLinus Torvalds && !tmp->rdev->in_sync) { 7991da177e4SLinus Torvalds conf->working_disks++; 8001da177e4SLinus Torvalds mddev->degraded--; 8011da177e4SLinus Torvalds tmp->rdev->in_sync = 1; 8021da177e4SLinus Torvalds } 8031da177e4SLinus Torvalds } 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvalds print_conf(conf); 8061da177e4SLinus Torvalds return 0; 8071da177e4SLinus Torvalds } 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvalds static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) 8111da177e4SLinus Torvalds { 8121da177e4SLinus Torvalds conf_t *conf = mddev->private; 8131da177e4SLinus Torvalds int found = 0; 8141da177e4SLinus Torvalds int mirror; 8151da177e4SLinus Torvalds mirror_info_t *p; 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds for (mirror=0; mirror < mddev->raid_disks; mirror++) 8181da177e4SLinus Torvalds if ( !(p=conf->mirrors+mirror)->rdev) { 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds blk_queue_stack_limits(mddev->queue, 8211da177e4SLinus Torvalds rdev->bdev->bd_disk->queue); 8221da177e4SLinus Torvalds /* as we don't honour merge_bvec_fn, we must never risk 8231da177e4SLinus Torvalds * violating it, so limit ->max_sector to one PAGE, as 8241da177e4SLinus Torvalds * a one page request is never in violation. 8251da177e4SLinus Torvalds */ 8261da177e4SLinus Torvalds if (rdev->bdev->bd_disk->queue->merge_bvec_fn && 8271da177e4SLinus Torvalds mddev->queue->max_sectors > (PAGE_SIZE>>9)) 8281da177e4SLinus Torvalds blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds p->head_position = 0; 8311da177e4SLinus Torvalds rdev->raid_disk = mirror; 8321da177e4SLinus Torvalds found = 1; 8331da177e4SLinus Torvalds p->rdev = rdev; 8341da177e4SLinus Torvalds break; 8351da177e4SLinus Torvalds } 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvalds print_conf(conf); 8381da177e4SLinus Torvalds return found; 8391da177e4SLinus Torvalds } 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvalds static int raid1_remove_disk(mddev_t *mddev, int number) 8421da177e4SLinus Torvalds { 8431da177e4SLinus Torvalds conf_t *conf = mddev->private; 8441da177e4SLinus Torvalds int err = 0; 8451da177e4SLinus Torvalds mdk_rdev_t *rdev; 8461da177e4SLinus Torvalds mirror_info_t *p = conf->mirrors+ number; 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvalds print_conf(conf); 8491da177e4SLinus Torvalds rdev = p->rdev; 8501da177e4SLinus Torvalds if (rdev) { 8511da177e4SLinus Torvalds if (rdev->in_sync || 8521da177e4SLinus Torvalds atomic_read(&rdev->nr_pending)) { 8531da177e4SLinus Torvalds err = -EBUSY; 8541da177e4SLinus Torvalds goto abort; 8551da177e4SLinus Torvalds } 8561da177e4SLinus Torvalds p->rdev = NULL; 857fbd568a3SPaul E. McKenney synchronize_rcu(); 8581da177e4SLinus Torvalds if (atomic_read(&rdev->nr_pending)) { 8591da177e4SLinus Torvalds /* lost the race, try later */ 8601da177e4SLinus Torvalds err = -EBUSY; 8611da177e4SLinus Torvalds p->rdev = rdev; 8621da177e4SLinus Torvalds } 8631da177e4SLinus Torvalds } 8641da177e4SLinus Torvalds abort: 8651da177e4SLinus Torvalds 8661da177e4SLinus Torvalds print_conf(conf); 8671da177e4SLinus Torvalds return err; 8681da177e4SLinus Torvalds } 8691da177e4SLinus Torvalds 8701da177e4SLinus Torvalds 8711da177e4SLinus Torvalds static int end_sync_read(struct bio *bio, unsigned int bytes_done, int error) 8721da177e4SLinus Torvalds { 8731da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 8741da177e4SLinus Torvalds r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); 8751da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(r1_bio->mddev); 8761da177e4SLinus Torvalds 8771da177e4SLinus Torvalds if (bio->bi_size) 8781da177e4SLinus Torvalds return 1; 8791da177e4SLinus Torvalds 8801da177e4SLinus Torvalds if (r1_bio->bios[r1_bio->read_disk] != bio) 8811da177e4SLinus Torvalds BUG(); 8821da177e4SLinus Torvalds update_head_pos(r1_bio->read_disk, r1_bio); 8831da177e4SLinus Torvalds /* 8841da177e4SLinus Torvalds * we have read a block, now it needs to be re-written, 8851da177e4SLinus Torvalds * or re-read if the read failed. 8861da177e4SLinus Torvalds * We don't do much here, just schedule handling by raid1d 8871da177e4SLinus Torvalds */ 888191ea9b2SNeilBrown if (!uptodate) { 8891da177e4SLinus Torvalds md_error(r1_bio->mddev, 8901da177e4SLinus Torvalds conf->mirrors[r1_bio->read_disk].rdev); 891191ea9b2SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 892191ea9b2SNeilBrown } else 8931da177e4SLinus Torvalds set_bit(R1BIO_Uptodate, &r1_bio->state); 8941da177e4SLinus Torvalds rdev_dec_pending(conf->mirrors[r1_bio->read_disk].rdev, conf->mddev); 8951da177e4SLinus Torvalds reschedule_retry(r1_bio); 8961da177e4SLinus Torvalds return 0; 8971da177e4SLinus Torvalds } 8981da177e4SLinus Torvalds 8991da177e4SLinus Torvalds static int end_sync_write(struct bio *bio, unsigned int bytes_done, int error) 9001da177e4SLinus Torvalds { 9011da177e4SLinus Torvalds int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); 9021da177e4SLinus Torvalds r1bio_t * r1_bio = (r1bio_t *)(bio->bi_private); 9031da177e4SLinus Torvalds mddev_t *mddev = r1_bio->mddev; 9041da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 9051da177e4SLinus Torvalds int i; 9061da177e4SLinus Torvalds int mirror=0; 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds if (bio->bi_size) 9091da177e4SLinus Torvalds return 1; 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) 9121da177e4SLinus Torvalds if (r1_bio->bios[i] == bio) { 9131da177e4SLinus Torvalds mirror = i; 9141da177e4SLinus Torvalds break; 9151da177e4SLinus Torvalds } 916191ea9b2SNeilBrown if (!uptodate) { 9171da177e4SLinus Torvalds md_error(mddev, conf->mirrors[mirror].rdev); 918191ea9b2SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 919191ea9b2SNeilBrown } 9201da177e4SLinus Torvalds update_head_pos(mirror, r1_bio); 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 9231da177e4SLinus Torvalds md_done_sync(mddev, r1_bio->sectors, uptodate); 9241da177e4SLinus Torvalds put_buf(r1_bio); 9251da177e4SLinus Torvalds } 9261da177e4SLinus Torvalds rdev_dec_pending(conf->mirrors[mirror].rdev, mddev); 9271da177e4SLinus Torvalds return 0; 9281da177e4SLinus Torvalds } 9291da177e4SLinus Torvalds 9301da177e4SLinus Torvalds static void sync_request_write(mddev_t *mddev, r1bio_t *r1_bio) 9311da177e4SLinus Torvalds { 9321da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 9331da177e4SLinus Torvalds int i; 9341da177e4SLinus Torvalds int disks = conf->raid_disks; 9351da177e4SLinus Torvalds struct bio *bio, *wbio; 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds bio = r1_bio->bios[r1_bio->read_disk]; 9381da177e4SLinus Torvalds 9391da177e4SLinus Torvalds /* 940191ea9b2SNeilBrown if (r1_bio->sector == 0) printk("First sync write startss\n"); 941191ea9b2SNeilBrown */ 942191ea9b2SNeilBrown /* 9431da177e4SLinus Torvalds * schedule writes 9441da177e4SLinus Torvalds */ 9451da177e4SLinus Torvalds if (!test_bit(R1BIO_Uptodate, &r1_bio->state)) { 9461da177e4SLinus Torvalds /* 9471da177e4SLinus Torvalds * There is no point trying a read-for-reconstruct as 9481da177e4SLinus Torvalds * reconstruct is about to be aborted 9491da177e4SLinus Torvalds */ 9501da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 9511da177e4SLinus Torvalds printk(KERN_ALERT "raid1: %s: unrecoverable I/O read error" 9521da177e4SLinus Torvalds " for block %llu\n", 9531da177e4SLinus Torvalds bdevname(bio->bi_bdev,b), 9541da177e4SLinus Torvalds (unsigned long long)r1_bio->sector); 9551da177e4SLinus Torvalds md_done_sync(mddev, r1_bio->sectors, 0); 9561da177e4SLinus Torvalds put_buf(r1_bio); 9571da177e4SLinus Torvalds return; 9581da177e4SLinus Torvalds } 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds atomic_set(&r1_bio->remaining, 1); 9611da177e4SLinus Torvalds for (i = 0; i < disks ; i++) { 9621da177e4SLinus Torvalds wbio = r1_bio->bios[i]; 9631da177e4SLinus Torvalds if (wbio->bi_end_io != end_sync_write) 9641da177e4SLinus Torvalds continue; 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds atomic_inc(&conf->mirrors[i].rdev->nr_pending); 9671da177e4SLinus Torvalds atomic_inc(&r1_bio->remaining); 9681da177e4SLinus Torvalds md_sync_acct(conf->mirrors[i].rdev->bdev, wbio->bi_size >> 9); 969191ea9b2SNeilBrown 9701da177e4SLinus Torvalds generic_make_request(wbio); 9711da177e4SLinus Torvalds } 9721da177e4SLinus Torvalds 9731da177e4SLinus Torvalds if (atomic_dec_and_test(&r1_bio->remaining)) { 974191ea9b2SNeilBrown /* if we're here, all write(s) have completed, so clean up */ 9751da177e4SLinus Torvalds md_done_sync(mddev, r1_bio->sectors, 1); 9761da177e4SLinus Torvalds put_buf(r1_bio); 9771da177e4SLinus Torvalds } 9781da177e4SLinus Torvalds } 9791da177e4SLinus Torvalds 9801da177e4SLinus Torvalds /* 9811da177e4SLinus Torvalds * This is a kernel thread which: 9821da177e4SLinus Torvalds * 9831da177e4SLinus Torvalds * 1. Retries failed read operations on working mirrors. 9841da177e4SLinus Torvalds * 2. Updates the raid superblock when problems encounter. 9851da177e4SLinus Torvalds * 3. Performs writes following reads for array syncronising. 9861da177e4SLinus Torvalds */ 9871da177e4SLinus Torvalds 9881da177e4SLinus Torvalds static void raid1d(mddev_t *mddev) 9891da177e4SLinus Torvalds { 9901da177e4SLinus Torvalds r1bio_t *r1_bio; 9911da177e4SLinus Torvalds struct bio *bio; 9921da177e4SLinus Torvalds unsigned long flags; 9931da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 9941da177e4SLinus Torvalds struct list_head *head = &conf->retry_list; 9951da177e4SLinus Torvalds int unplug=0; 9961da177e4SLinus Torvalds mdk_rdev_t *rdev; 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds md_check_recovery(mddev); 9991da177e4SLinus Torvalds 10001da177e4SLinus Torvalds for (;;) { 10011da177e4SLinus Torvalds char b[BDEVNAME_SIZE]; 10021da177e4SLinus Torvalds spin_lock_irqsave(&conf->device_lock, flags); 1003191ea9b2SNeilBrown 1004191ea9b2SNeilBrown if (conf->pending_bio_list.head) { 1005191ea9b2SNeilBrown bio = bio_list_get(&conf->pending_bio_list); 1006191ea9b2SNeilBrown blk_remove_plug(mddev->queue); 1007191ea9b2SNeilBrown spin_unlock_irqrestore(&conf->device_lock, flags); 1008191ea9b2SNeilBrown /* flush any pending bitmap writes to disk before proceeding w/ I/O */ 1009191ea9b2SNeilBrown if (bitmap_unplug(mddev->bitmap) != 0) 1010191ea9b2SNeilBrown printk("%s: bitmap file write failed!\n", mdname(mddev)); 1011191ea9b2SNeilBrown 1012191ea9b2SNeilBrown while (bio) { /* submit pending writes */ 1013191ea9b2SNeilBrown struct bio *next = bio->bi_next; 1014191ea9b2SNeilBrown bio->bi_next = NULL; 1015191ea9b2SNeilBrown generic_make_request(bio); 1016191ea9b2SNeilBrown bio = next; 1017191ea9b2SNeilBrown } 1018191ea9b2SNeilBrown unplug = 1; 1019191ea9b2SNeilBrown 1020191ea9b2SNeilBrown continue; 1021191ea9b2SNeilBrown } 1022191ea9b2SNeilBrown 10231da177e4SLinus Torvalds if (list_empty(head)) 10241da177e4SLinus Torvalds break; 10251da177e4SLinus Torvalds r1_bio = list_entry(head->prev, r1bio_t, retry_list); 10261da177e4SLinus Torvalds list_del(head->prev); 10271da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 10281da177e4SLinus Torvalds 10291da177e4SLinus Torvalds mddev = r1_bio->mddev; 10301da177e4SLinus Torvalds conf = mddev_to_conf(mddev); 10311da177e4SLinus Torvalds if (test_bit(R1BIO_IsSync, &r1_bio->state)) { 10321da177e4SLinus Torvalds sync_request_write(mddev, r1_bio); 10331da177e4SLinus Torvalds unplug = 1; 10341da177e4SLinus Torvalds } else { 10351da177e4SLinus Torvalds int disk; 10361da177e4SLinus Torvalds bio = r1_bio->bios[r1_bio->read_disk]; 10371da177e4SLinus Torvalds if ((disk=read_balance(conf, r1_bio)) == -1) { 10381da177e4SLinus Torvalds printk(KERN_ALERT "raid1: %s: unrecoverable I/O" 10391da177e4SLinus Torvalds " read error for block %llu\n", 10401da177e4SLinus Torvalds bdevname(bio->bi_bdev,b), 10411da177e4SLinus Torvalds (unsigned long long)r1_bio->sector); 10421da177e4SLinus Torvalds raid_end_bio_io(r1_bio); 10431da177e4SLinus Torvalds } else { 10441da177e4SLinus Torvalds r1_bio->bios[r1_bio->read_disk] = NULL; 10451da177e4SLinus Torvalds r1_bio->read_disk = disk; 10461da177e4SLinus Torvalds bio_put(bio); 10471da177e4SLinus Torvalds bio = bio_clone(r1_bio->master_bio, GFP_NOIO); 10481da177e4SLinus Torvalds r1_bio->bios[r1_bio->read_disk] = bio; 10491da177e4SLinus Torvalds rdev = conf->mirrors[disk].rdev; 10501da177e4SLinus Torvalds if (printk_ratelimit()) 10511da177e4SLinus Torvalds printk(KERN_ERR "raid1: %s: redirecting sector %llu to" 10521da177e4SLinus Torvalds " another mirror\n", 10531da177e4SLinus Torvalds bdevname(rdev->bdev,b), 10541da177e4SLinus Torvalds (unsigned long long)r1_bio->sector); 10551da177e4SLinus Torvalds bio->bi_sector = r1_bio->sector + rdev->data_offset; 10561da177e4SLinus Torvalds bio->bi_bdev = rdev->bdev; 10571da177e4SLinus Torvalds bio->bi_end_io = raid1_end_read_request; 10581da177e4SLinus Torvalds bio->bi_rw = READ; 10591da177e4SLinus Torvalds bio->bi_private = r1_bio; 10601da177e4SLinus Torvalds unplug = 1; 10611da177e4SLinus Torvalds generic_make_request(bio); 10621da177e4SLinus Torvalds } 10631da177e4SLinus Torvalds } 10641da177e4SLinus Torvalds } 10651da177e4SLinus Torvalds spin_unlock_irqrestore(&conf->device_lock, flags); 10661da177e4SLinus Torvalds if (unplug) 10671da177e4SLinus Torvalds unplug_slaves(mddev); 10681da177e4SLinus Torvalds } 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds 10711da177e4SLinus Torvalds static int init_resync(conf_t *conf) 10721da177e4SLinus Torvalds { 10731da177e4SLinus Torvalds int buffs; 10741da177e4SLinus Torvalds 10751da177e4SLinus Torvalds buffs = RESYNC_WINDOW / RESYNC_BLOCK_SIZE; 10761da177e4SLinus Torvalds if (conf->r1buf_pool) 10771da177e4SLinus Torvalds BUG(); 10781da177e4SLinus Torvalds conf->r1buf_pool = mempool_create(buffs, r1buf_pool_alloc, r1buf_pool_free, 10791da177e4SLinus Torvalds conf->poolinfo); 10801da177e4SLinus Torvalds if (!conf->r1buf_pool) 10811da177e4SLinus Torvalds return -ENOMEM; 10821da177e4SLinus Torvalds conf->next_resync = 0; 10831da177e4SLinus Torvalds return 0; 10841da177e4SLinus Torvalds } 10851da177e4SLinus Torvalds 10861da177e4SLinus Torvalds /* 10871da177e4SLinus Torvalds * perform a "sync" on one "block" 10881da177e4SLinus Torvalds * 10891da177e4SLinus Torvalds * We need to make sure that no normal I/O request - particularly write 10901da177e4SLinus Torvalds * requests - conflict with active sync requests. 10911da177e4SLinus Torvalds * 10921da177e4SLinus Torvalds * This is achieved by tracking pending requests and a 'barrier' concept 10931da177e4SLinus Torvalds * that can be installed to exclude normal IO requests. 10941da177e4SLinus Torvalds */ 10951da177e4SLinus Torvalds 109657afd89fSNeilBrown static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster) 10971da177e4SLinus Torvalds { 10981da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 10991da177e4SLinus Torvalds mirror_info_t *mirror; 11001da177e4SLinus Torvalds r1bio_t *r1_bio; 11011da177e4SLinus Torvalds struct bio *bio; 11021da177e4SLinus Torvalds sector_t max_sector, nr_sectors; 11031da177e4SLinus Torvalds int disk; 11041da177e4SLinus Torvalds int i; 11051da177e4SLinus Torvalds int write_targets = 0; 1106191ea9b2SNeilBrown int sync_blocks; 11071da177e4SLinus Torvalds 11081da177e4SLinus Torvalds if (!conf->r1buf_pool) 1109191ea9b2SNeilBrown { 1110191ea9b2SNeilBrown /* 1111191ea9b2SNeilBrown printk("sync start - bitmap %p\n", mddev->bitmap); 1112191ea9b2SNeilBrown */ 11131da177e4SLinus Torvalds if (init_resync(conf)) 111457afd89fSNeilBrown return 0; 1115191ea9b2SNeilBrown } 11161da177e4SLinus Torvalds 11171da177e4SLinus Torvalds max_sector = mddev->size << 1; 11181da177e4SLinus Torvalds if (sector_nr >= max_sector) { 1119191ea9b2SNeilBrown /* If we aborted, we need to abort the 1120191ea9b2SNeilBrown * sync on the 'current' bitmap chunk (there will 1121191ea9b2SNeilBrown * only be one in raid1 resync. 1122191ea9b2SNeilBrown * We can find the current addess in mddev->curr_resync 1123191ea9b2SNeilBrown */ 1124191ea9b2SNeilBrown if (!conf->fullsync) { 1125191ea9b2SNeilBrown if (mddev->curr_resync < max_sector) 1126191ea9b2SNeilBrown bitmap_end_sync(mddev->bitmap, 1127191ea9b2SNeilBrown mddev->curr_resync, 1128191ea9b2SNeilBrown &sync_blocks, 1); 1129191ea9b2SNeilBrown bitmap_close_sync(mddev->bitmap); 1130191ea9b2SNeilBrown } 1131191ea9b2SNeilBrown if (mddev->curr_resync >= max_sector) 1132191ea9b2SNeilBrown conf->fullsync = 0; 11331da177e4SLinus Torvalds close_sync(conf); 11341da177e4SLinus Torvalds return 0; 11351da177e4SLinus Torvalds } 11361da177e4SLinus Torvalds 1137191ea9b2SNeilBrown if (!conf->fullsync && 1138191ea9b2SNeilBrown !bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks)) { 1139191ea9b2SNeilBrown /* We can skip this block, and probably several more */ 1140191ea9b2SNeilBrown *skipped = 1; 1141191ea9b2SNeilBrown return sync_blocks; 1142191ea9b2SNeilBrown } 11431da177e4SLinus Torvalds /* 11441da177e4SLinus Torvalds * If there is non-resync activity waiting for us then 11451da177e4SLinus Torvalds * put in a delay to throttle resync. 11461da177e4SLinus Torvalds */ 11471da177e4SLinus Torvalds if (!go_faster && waitqueue_active(&conf->wait_resume)) 11481da177e4SLinus Torvalds msleep_interruptible(1000); 11491da177e4SLinus Torvalds device_barrier(conf, sector_nr + RESYNC_SECTORS); 11501da177e4SLinus Torvalds 11511da177e4SLinus Torvalds /* 11521da177e4SLinus Torvalds * If reconstructing, and >1 working disc, 11531da177e4SLinus Torvalds * could dedicate one to rebuild and others to 11541da177e4SLinus Torvalds * service read requests .. 11551da177e4SLinus Torvalds */ 11561da177e4SLinus Torvalds disk = conf->last_used; 11571da177e4SLinus Torvalds /* make sure disk is operational */ 11581da177e4SLinus Torvalds 11591da177e4SLinus Torvalds while (conf->mirrors[disk].rdev == NULL || 11601da177e4SLinus Torvalds !conf->mirrors[disk].rdev->in_sync) { 11611da177e4SLinus Torvalds if (disk <= 0) 11621da177e4SLinus Torvalds disk = conf->raid_disks; 11631da177e4SLinus Torvalds disk--; 11641da177e4SLinus Torvalds if (disk == conf->last_used) 11651da177e4SLinus Torvalds break; 11661da177e4SLinus Torvalds } 11671da177e4SLinus Torvalds conf->last_used = disk; 11681da177e4SLinus Torvalds atomic_inc(&conf->mirrors[disk].rdev->nr_pending); 11691da177e4SLinus Torvalds 11701da177e4SLinus Torvalds 11711da177e4SLinus Torvalds mirror = conf->mirrors + disk; 11721da177e4SLinus Torvalds 11731da177e4SLinus Torvalds r1_bio = mempool_alloc(conf->r1buf_pool, GFP_NOIO); 11741da177e4SLinus Torvalds 11751da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 11761da177e4SLinus Torvalds conf->nr_pending++; 11771da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 11781da177e4SLinus Torvalds 11791da177e4SLinus Torvalds r1_bio->mddev = mddev; 11801da177e4SLinus Torvalds r1_bio->sector = sector_nr; 1181191ea9b2SNeilBrown r1_bio->state = 0; 11821da177e4SLinus Torvalds set_bit(R1BIO_IsSync, &r1_bio->state); 11831da177e4SLinus Torvalds r1_bio->read_disk = disk; 11841da177e4SLinus Torvalds 11851da177e4SLinus Torvalds for (i=0; i < conf->raid_disks; i++) { 11861da177e4SLinus Torvalds bio = r1_bio->bios[i]; 11871da177e4SLinus Torvalds 11881da177e4SLinus Torvalds /* take from bio_init */ 11891da177e4SLinus Torvalds bio->bi_next = NULL; 11901da177e4SLinus Torvalds bio->bi_flags |= 1 << BIO_UPTODATE; 11911da177e4SLinus Torvalds bio->bi_rw = 0; 11921da177e4SLinus Torvalds bio->bi_vcnt = 0; 11931da177e4SLinus Torvalds bio->bi_idx = 0; 11941da177e4SLinus Torvalds bio->bi_phys_segments = 0; 11951da177e4SLinus Torvalds bio->bi_hw_segments = 0; 11961da177e4SLinus Torvalds bio->bi_size = 0; 11971da177e4SLinus Torvalds bio->bi_end_io = NULL; 11981da177e4SLinus Torvalds bio->bi_private = NULL; 11991da177e4SLinus Torvalds 12001da177e4SLinus Torvalds if (i == disk) { 12011da177e4SLinus Torvalds bio->bi_rw = READ; 12021da177e4SLinus Torvalds bio->bi_end_io = end_sync_read; 12031da177e4SLinus Torvalds } else if (conf->mirrors[i].rdev && 12041da177e4SLinus Torvalds !conf->mirrors[i].rdev->faulty && 12051da177e4SLinus Torvalds (!conf->mirrors[i].rdev->in_sync || 12061da177e4SLinus Torvalds sector_nr + RESYNC_SECTORS > mddev->recovery_cp)) { 12071da177e4SLinus Torvalds bio->bi_rw = WRITE; 12081da177e4SLinus Torvalds bio->bi_end_io = end_sync_write; 12091da177e4SLinus Torvalds write_targets ++; 12101da177e4SLinus Torvalds } else 12111da177e4SLinus Torvalds continue; 12121da177e4SLinus Torvalds bio->bi_sector = sector_nr + conf->mirrors[i].rdev->data_offset; 12131da177e4SLinus Torvalds bio->bi_bdev = conf->mirrors[i].rdev->bdev; 12141da177e4SLinus Torvalds bio->bi_private = r1_bio; 12151da177e4SLinus Torvalds } 1216191ea9b2SNeilBrown 1217191ea9b2SNeilBrown if (write_targets + 1 < conf->raid_disks) 1218191ea9b2SNeilBrown /* array degraded, can't clear bitmap */ 1219191ea9b2SNeilBrown set_bit(R1BIO_Degraded, &r1_bio->state); 1220191ea9b2SNeilBrown 12211da177e4SLinus Torvalds if (write_targets == 0) { 12221da177e4SLinus Torvalds /* There is nowhere to write, so all non-sync 12231da177e4SLinus Torvalds * drives must be failed - so we are finished 12241da177e4SLinus Torvalds */ 122557afd89fSNeilBrown sector_t rv = max_sector - sector_nr; 122657afd89fSNeilBrown *skipped = 1; 12271da177e4SLinus Torvalds put_buf(r1_bio); 12281da177e4SLinus Torvalds rdev_dec_pending(conf->mirrors[disk].rdev, mddev); 12291da177e4SLinus Torvalds return rv; 12301da177e4SLinus Torvalds } 12311da177e4SLinus Torvalds 12321da177e4SLinus Torvalds nr_sectors = 0; 1233289e99e8SNeilBrown sync_blocks = 0; 12341da177e4SLinus Torvalds do { 12351da177e4SLinus Torvalds struct page *page; 12361da177e4SLinus Torvalds int len = PAGE_SIZE; 12371da177e4SLinus Torvalds if (sector_nr + (len>>9) > max_sector) 12381da177e4SLinus Torvalds len = (max_sector - sector_nr) << 9; 12391da177e4SLinus Torvalds if (len == 0) 12401da177e4SLinus Torvalds break; 1241ab7a30c7SNeilBrown if (!conf->fullsync) { 1242ab7a30c7SNeilBrown if (sync_blocks == 0) { 1243191ea9b2SNeilBrown if (!bitmap_start_sync(mddev->bitmap, 1244191ea9b2SNeilBrown sector_nr, &sync_blocks)) 1245191ea9b2SNeilBrown break; 1246191ea9b2SNeilBrown if (sync_blocks < (PAGE_SIZE>>9)) 1247191ea9b2SNeilBrown BUG(); 1248191ea9b2SNeilBrown if (len > (sync_blocks<<9)) len = sync_blocks<<9; 1249ab7a30c7SNeilBrown } 1250ab7a30c7SNeilBrown } 1251191ea9b2SNeilBrown 12521da177e4SLinus Torvalds for (i=0 ; i < conf->raid_disks; i++) { 12531da177e4SLinus Torvalds bio = r1_bio->bios[i]; 12541da177e4SLinus Torvalds if (bio->bi_end_io) { 12551da177e4SLinus Torvalds page = r1_bio->bios[0]->bi_io_vec[bio->bi_vcnt].bv_page; 12561da177e4SLinus Torvalds if (bio_add_page(bio, page, len, 0) == 0) { 12571da177e4SLinus Torvalds /* stop here */ 12581da177e4SLinus Torvalds r1_bio->bios[0]->bi_io_vec[bio->bi_vcnt].bv_page = page; 12591da177e4SLinus Torvalds while (i > 0) { 12601da177e4SLinus Torvalds i--; 12611da177e4SLinus Torvalds bio = r1_bio->bios[i]; 12621da177e4SLinus Torvalds if (bio->bi_end_io==NULL) continue; 12631da177e4SLinus Torvalds /* remove last page from this bio */ 12641da177e4SLinus Torvalds bio->bi_vcnt--; 12651da177e4SLinus Torvalds bio->bi_size -= len; 12661da177e4SLinus Torvalds bio->bi_flags &= ~(1<< BIO_SEG_VALID); 12671da177e4SLinus Torvalds } 12681da177e4SLinus Torvalds goto bio_full; 12691da177e4SLinus Torvalds } 12701da177e4SLinus Torvalds } 12711da177e4SLinus Torvalds } 12721da177e4SLinus Torvalds nr_sectors += len>>9; 12731da177e4SLinus Torvalds sector_nr += len>>9; 1274191ea9b2SNeilBrown sync_blocks -= (len>>9); 12751da177e4SLinus Torvalds } while (r1_bio->bios[disk]->bi_vcnt < RESYNC_PAGES); 12761da177e4SLinus Torvalds bio_full: 12771da177e4SLinus Torvalds bio = r1_bio->bios[disk]; 12781da177e4SLinus Torvalds r1_bio->sectors = nr_sectors; 12791da177e4SLinus Torvalds 12801da177e4SLinus Torvalds md_sync_acct(mirror->rdev->bdev, nr_sectors); 12811da177e4SLinus Torvalds 12821da177e4SLinus Torvalds generic_make_request(bio); 12831da177e4SLinus Torvalds 12841da177e4SLinus Torvalds return nr_sectors; 12851da177e4SLinus Torvalds } 12861da177e4SLinus Torvalds 12871da177e4SLinus Torvalds static int run(mddev_t *mddev) 12881da177e4SLinus Torvalds { 12891da177e4SLinus Torvalds conf_t *conf; 12901da177e4SLinus Torvalds int i, j, disk_idx; 12911da177e4SLinus Torvalds mirror_info_t *disk; 12921da177e4SLinus Torvalds mdk_rdev_t *rdev; 12931da177e4SLinus Torvalds struct list_head *tmp; 12941da177e4SLinus Torvalds 12951da177e4SLinus Torvalds if (mddev->level != 1) { 12961da177e4SLinus Torvalds printk("raid1: %s: raid level not set to mirroring (%d)\n", 12971da177e4SLinus Torvalds mdname(mddev), mddev->level); 12981da177e4SLinus Torvalds goto out; 12991da177e4SLinus Torvalds } 13001da177e4SLinus Torvalds /* 13011da177e4SLinus Torvalds * copy the already verified devices into our private RAID1 13021da177e4SLinus Torvalds * bookkeeping area. [whatever we allocate in run(), 13031da177e4SLinus Torvalds * should be freed in stop()] 13041da177e4SLinus Torvalds */ 13051da177e4SLinus Torvalds conf = kmalloc(sizeof(conf_t), GFP_KERNEL); 13061da177e4SLinus Torvalds mddev->private = conf; 13071da177e4SLinus Torvalds if (!conf) 13081da177e4SLinus Torvalds goto out_no_mem; 13091da177e4SLinus Torvalds 13101da177e4SLinus Torvalds memset(conf, 0, sizeof(*conf)); 13111da177e4SLinus Torvalds conf->mirrors = kmalloc(sizeof(struct mirror_info)*mddev->raid_disks, 13121da177e4SLinus Torvalds GFP_KERNEL); 13131da177e4SLinus Torvalds if (!conf->mirrors) 13141da177e4SLinus Torvalds goto out_no_mem; 13151da177e4SLinus Torvalds 13161da177e4SLinus Torvalds memset(conf->mirrors, 0, sizeof(struct mirror_info)*mddev->raid_disks); 13171da177e4SLinus Torvalds 13181da177e4SLinus Torvalds conf->poolinfo = kmalloc(sizeof(*conf->poolinfo), GFP_KERNEL); 13191da177e4SLinus Torvalds if (!conf->poolinfo) 13201da177e4SLinus Torvalds goto out_no_mem; 13211da177e4SLinus Torvalds conf->poolinfo->mddev = mddev; 13221da177e4SLinus Torvalds conf->poolinfo->raid_disks = mddev->raid_disks; 13231da177e4SLinus Torvalds conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 13241da177e4SLinus Torvalds r1bio_pool_free, 13251da177e4SLinus Torvalds conf->poolinfo); 13261da177e4SLinus Torvalds if (!conf->r1bio_pool) 13271da177e4SLinus Torvalds goto out_no_mem; 13281da177e4SLinus Torvalds 13291da177e4SLinus Torvalds ITERATE_RDEV(mddev, rdev, tmp) { 13301da177e4SLinus Torvalds disk_idx = rdev->raid_disk; 13311da177e4SLinus Torvalds if (disk_idx >= mddev->raid_disks 13321da177e4SLinus Torvalds || disk_idx < 0) 13331da177e4SLinus Torvalds continue; 13341da177e4SLinus Torvalds disk = conf->mirrors + disk_idx; 13351da177e4SLinus Torvalds 13361da177e4SLinus Torvalds disk->rdev = rdev; 13371da177e4SLinus Torvalds 13381da177e4SLinus Torvalds blk_queue_stack_limits(mddev->queue, 13391da177e4SLinus Torvalds rdev->bdev->bd_disk->queue); 13401da177e4SLinus Torvalds /* as we don't honour merge_bvec_fn, we must never risk 13411da177e4SLinus Torvalds * violating it, so limit ->max_sector to one PAGE, as 13421da177e4SLinus Torvalds * a one page request is never in violation. 13431da177e4SLinus Torvalds */ 13441da177e4SLinus Torvalds if (rdev->bdev->bd_disk->queue->merge_bvec_fn && 13451da177e4SLinus Torvalds mddev->queue->max_sectors > (PAGE_SIZE>>9)) 13461da177e4SLinus Torvalds blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); 13471da177e4SLinus Torvalds 13481da177e4SLinus Torvalds disk->head_position = 0; 13491da177e4SLinus Torvalds if (!rdev->faulty && rdev->in_sync) 13501da177e4SLinus Torvalds conf->working_disks++; 13511da177e4SLinus Torvalds } 13521da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks; 13531da177e4SLinus Torvalds conf->mddev = mddev; 13541da177e4SLinus Torvalds spin_lock_init(&conf->device_lock); 13551da177e4SLinus Torvalds INIT_LIST_HEAD(&conf->retry_list); 13561da177e4SLinus Torvalds if (conf->working_disks == 1) 13571da177e4SLinus Torvalds mddev->recovery_cp = MaxSector; 13581da177e4SLinus Torvalds 13591da177e4SLinus Torvalds spin_lock_init(&conf->resync_lock); 13601da177e4SLinus Torvalds init_waitqueue_head(&conf->wait_idle); 13611da177e4SLinus Torvalds init_waitqueue_head(&conf->wait_resume); 13621da177e4SLinus Torvalds 1363191ea9b2SNeilBrown bio_list_init(&conf->pending_bio_list); 1364191ea9b2SNeilBrown bio_list_init(&conf->flushing_bio_list); 1365191ea9b2SNeilBrown 13661da177e4SLinus Torvalds if (!conf->working_disks) { 13671da177e4SLinus Torvalds printk(KERN_ERR "raid1: no operational mirrors for %s\n", 13681da177e4SLinus Torvalds mdname(mddev)); 13691da177e4SLinus Torvalds goto out_free_conf; 13701da177e4SLinus Torvalds } 13711da177e4SLinus Torvalds 13721da177e4SLinus Torvalds mddev->degraded = 0; 13731da177e4SLinus Torvalds for (i = 0; i < conf->raid_disks; i++) { 13741da177e4SLinus Torvalds 13751da177e4SLinus Torvalds disk = conf->mirrors + i; 13761da177e4SLinus Torvalds 13771da177e4SLinus Torvalds if (!disk->rdev) { 13781da177e4SLinus Torvalds disk->head_position = 0; 13791da177e4SLinus Torvalds mddev->degraded++; 13801da177e4SLinus Torvalds } 13811da177e4SLinus Torvalds } 13821da177e4SLinus Torvalds 13831da177e4SLinus Torvalds /* 13841da177e4SLinus Torvalds * find the first working one and use it as a starting point 13851da177e4SLinus Torvalds * to read balancing. 13861da177e4SLinus Torvalds */ 13871da177e4SLinus Torvalds for (j = 0; j < conf->raid_disks && 13881da177e4SLinus Torvalds (!conf->mirrors[j].rdev || 13891da177e4SLinus Torvalds !conf->mirrors[j].rdev->in_sync) ; j++) 13901da177e4SLinus Torvalds /* nothing */; 13911da177e4SLinus Torvalds conf->last_used = j; 13921da177e4SLinus Torvalds 13931da177e4SLinus Torvalds 13941da177e4SLinus Torvalds mddev->thread = md_register_thread(raid1d, mddev, "%s_raid1"); 13951da177e4SLinus Torvalds if (!mddev->thread) { 13961da177e4SLinus Torvalds printk(KERN_ERR 13971da177e4SLinus Torvalds "raid1: couldn't allocate thread for %s\n", 13981da177e4SLinus Torvalds mdname(mddev)); 13991da177e4SLinus Torvalds goto out_free_conf; 14001da177e4SLinus Torvalds } 1401191ea9b2SNeilBrown if (mddev->bitmap) mddev->thread->timeout = mddev->bitmap->daemon_sleep * HZ; 1402191ea9b2SNeilBrown 14031da177e4SLinus Torvalds printk(KERN_INFO 14041da177e4SLinus Torvalds "raid1: raid set %s active with %d out of %d mirrors\n", 14051da177e4SLinus Torvalds mdname(mddev), mddev->raid_disks - mddev->degraded, 14061da177e4SLinus Torvalds mddev->raid_disks); 14071da177e4SLinus Torvalds /* 14081da177e4SLinus Torvalds * Ok, everything is just fine now 14091da177e4SLinus Torvalds */ 14101da177e4SLinus Torvalds mddev->array_size = mddev->size; 14111da177e4SLinus Torvalds 14127a5febe9SNeilBrown mddev->queue->unplug_fn = raid1_unplug; 14137a5febe9SNeilBrown mddev->queue->issue_flush_fn = raid1_issue_flush; 14147a5febe9SNeilBrown 14151da177e4SLinus Torvalds return 0; 14161da177e4SLinus Torvalds 14171da177e4SLinus Torvalds out_no_mem: 14181da177e4SLinus Torvalds printk(KERN_ERR "raid1: couldn't allocate memory for %s\n", 14191da177e4SLinus Torvalds mdname(mddev)); 14201da177e4SLinus Torvalds 14211da177e4SLinus Torvalds out_free_conf: 14221da177e4SLinus Torvalds if (conf) { 14231da177e4SLinus Torvalds if (conf->r1bio_pool) 14241da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 14251da177e4SLinus Torvalds if (conf->mirrors) 14261da177e4SLinus Torvalds kfree(conf->mirrors); 14271da177e4SLinus Torvalds if (conf->poolinfo) 14281da177e4SLinus Torvalds kfree(conf->poolinfo); 14291da177e4SLinus Torvalds kfree(conf); 14301da177e4SLinus Torvalds mddev->private = NULL; 14311da177e4SLinus Torvalds } 14321da177e4SLinus Torvalds out: 14331da177e4SLinus Torvalds return -EIO; 14341da177e4SLinus Torvalds } 14351da177e4SLinus Torvalds 14361da177e4SLinus Torvalds static int stop(mddev_t *mddev) 14371da177e4SLinus Torvalds { 14381da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 14391da177e4SLinus Torvalds 14401da177e4SLinus Torvalds md_unregister_thread(mddev->thread); 14411da177e4SLinus Torvalds mddev->thread = NULL; 14421da177e4SLinus Torvalds blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ 14431da177e4SLinus Torvalds if (conf->r1bio_pool) 14441da177e4SLinus Torvalds mempool_destroy(conf->r1bio_pool); 14451da177e4SLinus Torvalds if (conf->mirrors) 14461da177e4SLinus Torvalds kfree(conf->mirrors); 14471da177e4SLinus Torvalds if (conf->poolinfo) 14481da177e4SLinus Torvalds kfree(conf->poolinfo); 14491da177e4SLinus Torvalds kfree(conf); 14501da177e4SLinus Torvalds mddev->private = NULL; 14511da177e4SLinus Torvalds return 0; 14521da177e4SLinus Torvalds } 14531da177e4SLinus Torvalds 14541da177e4SLinus Torvalds static int raid1_resize(mddev_t *mddev, sector_t sectors) 14551da177e4SLinus Torvalds { 14561da177e4SLinus Torvalds /* no resync is happening, and there is enough space 14571da177e4SLinus Torvalds * on all devices, so we can resize. 14581da177e4SLinus Torvalds * We need to make sure resync covers any new space. 14591da177e4SLinus Torvalds * If the array is shrinking we should possibly wait until 14601da177e4SLinus Torvalds * any io in the removed space completes, but it hardly seems 14611da177e4SLinus Torvalds * worth it. 14621da177e4SLinus Torvalds */ 14631da177e4SLinus Torvalds mddev->array_size = sectors>>1; 14641da177e4SLinus Torvalds set_capacity(mddev->gendisk, mddev->array_size << 1); 14651da177e4SLinus Torvalds mddev->changed = 1; 14661da177e4SLinus Torvalds if (mddev->array_size > mddev->size && mddev->recovery_cp == MaxSector) { 14671da177e4SLinus Torvalds mddev->recovery_cp = mddev->size << 1; 14681da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 14691da177e4SLinus Torvalds } 14701da177e4SLinus Torvalds mddev->size = mddev->array_size; 14711da177e4SLinus Torvalds return 0; 14721da177e4SLinus Torvalds } 14731da177e4SLinus Torvalds 14741da177e4SLinus Torvalds static int raid1_reshape(mddev_t *mddev, int raid_disks) 14751da177e4SLinus Torvalds { 14761da177e4SLinus Torvalds /* We need to: 14771da177e4SLinus Torvalds * 1/ resize the r1bio_pool 14781da177e4SLinus Torvalds * 2/ resize conf->mirrors 14791da177e4SLinus Torvalds * 14801da177e4SLinus Torvalds * We allocate a new r1bio_pool if we can. 14811da177e4SLinus Torvalds * Then raise a device barrier and wait until all IO stops. 14821da177e4SLinus Torvalds * Then resize conf->mirrors and swap in the new r1bio pool. 14836ea9c07cSNeilBrown * 14846ea9c07cSNeilBrown * At the same time, we "pack" the devices so that all the missing 14856ea9c07cSNeilBrown * devices have the higher raid_disk numbers. 14861da177e4SLinus Torvalds */ 14871da177e4SLinus Torvalds mempool_t *newpool, *oldpool; 14881da177e4SLinus Torvalds struct pool_info *newpoolinfo; 14891da177e4SLinus Torvalds mirror_info_t *newmirrors; 14901da177e4SLinus Torvalds conf_t *conf = mddev_to_conf(mddev); 14916ea9c07cSNeilBrown int cnt; 14921da177e4SLinus Torvalds 14936ea9c07cSNeilBrown int d, d2; 14941da177e4SLinus Torvalds 14956ea9c07cSNeilBrown if (raid_disks < conf->raid_disks) { 14966ea9c07cSNeilBrown cnt=0; 14976ea9c07cSNeilBrown for (d= 0; d < conf->raid_disks; d++) 14981da177e4SLinus Torvalds if (conf->mirrors[d].rdev) 14996ea9c07cSNeilBrown cnt++; 15006ea9c07cSNeilBrown if (cnt > raid_disks) 15011da177e4SLinus Torvalds return -EBUSY; 15026ea9c07cSNeilBrown } 15031da177e4SLinus Torvalds 15041da177e4SLinus Torvalds newpoolinfo = kmalloc(sizeof(*newpoolinfo), GFP_KERNEL); 15051da177e4SLinus Torvalds if (!newpoolinfo) 15061da177e4SLinus Torvalds return -ENOMEM; 15071da177e4SLinus Torvalds newpoolinfo->mddev = mddev; 15081da177e4SLinus Torvalds newpoolinfo->raid_disks = raid_disks; 15091da177e4SLinus Torvalds 15101da177e4SLinus Torvalds newpool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc, 15111da177e4SLinus Torvalds r1bio_pool_free, newpoolinfo); 15121da177e4SLinus Torvalds if (!newpool) { 15131da177e4SLinus Torvalds kfree(newpoolinfo); 15141da177e4SLinus Torvalds return -ENOMEM; 15151da177e4SLinus Torvalds } 15161da177e4SLinus Torvalds newmirrors = kmalloc(sizeof(struct mirror_info) * raid_disks, GFP_KERNEL); 15171da177e4SLinus Torvalds if (!newmirrors) { 15181da177e4SLinus Torvalds kfree(newpoolinfo); 15191da177e4SLinus Torvalds mempool_destroy(newpool); 15201da177e4SLinus Torvalds return -ENOMEM; 15211da177e4SLinus Torvalds } 15221da177e4SLinus Torvalds memset(newmirrors, 0, sizeof(struct mirror_info)*raid_disks); 15231da177e4SLinus Torvalds 15241da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 15251da177e4SLinus Torvalds conf->barrier++; 15261da177e4SLinus Torvalds wait_event_lock_irq(conf->wait_idle, !conf->nr_pending, 1527191ea9b2SNeilBrown conf->resync_lock, raid1_unplug(mddev->queue)); 15281da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 15291da177e4SLinus Torvalds 15301da177e4SLinus Torvalds /* ok, everything is stopped */ 15311da177e4SLinus Torvalds oldpool = conf->r1bio_pool; 15321da177e4SLinus Torvalds conf->r1bio_pool = newpool; 15336ea9c07cSNeilBrown 15346ea9c07cSNeilBrown for (d=d2=0; d < conf->raid_disks; d++) 15356ea9c07cSNeilBrown if (conf->mirrors[d].rdev) { 15366ea9c07cSNeilBrown conf->mirrors[d].rdev->raid_disk = d2; 15376ea9c07cSNeilBrown newmirrors[d2++].rdev = conf->mirrors[d].rdev; 15386ea9c07cSNeilBrown } 15391da177e4SLinus Torvalds kfree(conf->mirrors); 15401da177e4SLinus Torvalds conf->mirrors = newmirrors; 15411da177e4SLinus Torvalds kfree(conf->poolinfo); 15421da177e4SLinus Torvalds conf->poolinfo = newpoolinfo; 15431da177e4SLinus Torvalds 15441da177e4SLinus Torvalds mddev->degraded += (raid_disks - conf->raid_disks); 15451da177e4SLinus Torvalds conf->raid_disks = mddev->raid_disks = raid_disks; 15461da177e4SLinus Torvalds 15476ea9c07cSNeilBrown conf->last_used = 0; /* just make sure it is in-range */ 15481da177e4SLinus Torvalds spin_lock_irq(&conf->resync_lock); 15491da177e4SLinus Torvalds conf->barrier--; 15501da177e4SLinus Torvalds spin_unlock_irq(&conf->resync_lock); 15511da177e4SLinus Torvalds wake_up(&conf->wait_resume); 15521da177e4SLinus Torvalds wake_up(&conf->wait_idle); 15531da177e4SLinus Torvalds 15541da177e4SLinus Torvalds 15551da177e4SLinus Torvalds set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); 15561da177e4SLinus Torvalds md_wakeup_thread(mddev->thread); 15571da177e4SLinus Torvalds 15581da177e4SLinus Torvalds mempool_destroy(oldpool); 15591da177e4SLinus Torvalds return 0; 15601da177e4SLinus Torvalds } 15611da177e4SLinus Torvalds 15621da177e4SLinus Torvalds 15631da177e4SLinus Torvalds static mdk_personality_t raid1_personality = 15641da177e4SLinus Torvalds { 15651da177e4SLinus Torvalds .name = "raid1", 15661da177e4SLinus Torvalds .owner = THIS_MODULE, 15671da177e4SLinus Torvalds .make_request = make_request, 15681da177e4SLinus Torvalds .run = run, 15691da177e4SLinus Torvalds .stop = stop, 15701da177e4SLinus Torvalds .status = status, 15711da177e4SLinus Torvalds .error_handler = error, 15721da177e4SLinus Torvalds .hot_add_disk = raid1_add_disk, 15731da177e4SLinus Torvalds .hot_remove_disk= raid1_remove_disk, 15741da177e4SLinus Torvalds .spare_active = raid1_spare_active, 15751da177e4SLinus Torvalds .sync_request = sync_request, 15761da177e4SLinus Torvalds .resize = raid1_resize, 15771da177e4SLinus Torvalds .reshape = raid1_reshape, 15781da177e4SLinus Torvalds }; 15791da177e4SLinus Torvalds 15801da177e4SLinus Torvalds static int __init raid_init(void) 15811da177e4SLinus Torvalds { 15821da177e4SLinus Torvalds return register_md_personality(RAID1, &raid1_personality); 15831da177e4SLinus Torvalds } 15841da177e4SLinus Torvalds 15851da177e4SLinus Torvalds static void raid_exit(void) 15861da177e4SLinus Torvalds { 15871da177e4SLinus Torvalds unregister_md_personality(RAID1); 15881da177e4SLinus Torvalds } 15891da177e4SLinus Torvalds 15901da177e4SLinus Torvalds module_init(raid_init); 15911da177e4SLinus Torvalds module_exit(raid_exit); 15921da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 15931da177e4SLinus Torvalds MODULE_ALIAS("md-personality-3"); /* RAID1 */ 1594