dm-raid1.c revision 0f398a8403e31c737b429fddc3850093d0bf58d0
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 2003 Sistina Software Limited. 31f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen * Copyright (C) 2005-2008 Red Hat, Inc. All rights reserved. 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This file is released under the GPL. 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow#include "dm-bio-record.h" 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/mempool.h> 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/pagemap.h> 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/slab.h> 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/workqueue.h> 161f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen#include <linux/device-mapper.h> 17a765e20eeb423d0fa6a02ffab51141e53bbd93cbAlasdair G Kergon#include <linux/dm-io.h> 18a765e20eeb423d0fa6a02ffab51141e53bbd93cbAlasdair G Kergon#include <linux/dm-dirty-log.h> 19a765e20eeb423d0fa6a02ffab51141e53bbd93cbAlasdair G Kergon#include <linux/dm-kcopyd.h> 201f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen#include <linux/dm-region-hash.h> 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2272d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon#define DM_MSG_PREFIX "raid1" 231f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen 241f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen#define MAX_RECOVERY 1 /* Maximum number of regions recovered in parallel. */ 2588be163abb5324bab09f5eff9646590eec5314ebMilan Broz#define DM_IO_PAGES 64 261f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen#define DM_KCOPYD_PAGES 64 2772d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon 28a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow#define DM_RAID1_HANDLE_ERRORS 0x01 29f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow#define errors_handled(p) ((p)->features & DM_RAID1_HANDLE_ERRORS) 30a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 3133184048dc4f9d5550d3b6a88c8e0ff92033eb6eJonathan E Brassowstatic DECLARE_WAIT_QUEUE_HEAD(_kmirrord_recovery_stopped); 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 34e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown * Mirror set structures. 35e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown *---------------------------------------------------------------*/ 3672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowenum dm_raid1_error { 3772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow DM_RAID1_WRITE_ERROR, 3864b30c46e866bbff8a9e17883a18636adc358455Mikulas Patocka DM_RAID1_FLUSH_ERROR, 3972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow DM_RAID1_SYNC_ERROR, 4072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow DM_RAID1_READ_ERROR 4172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow}; 4272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 43e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brownstruct mirror { 44aa5617c55357d86c9082ba1d66fa9795370c9954Jonathan Brassow struct mirror_set *ms; 45e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown atomic_t error_count; 4639ed7adb17bdec8224bd3fae551bb7222e05f35bAl Viro unsigned long error_type; 47e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown struct dm_dev *dev; 48e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown sector_t offset; 49e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown}; 50e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown 51e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brownstruct mirror_set { 52e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown struct dm_target *ti; 53e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown struct list_head list; 541f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen 55a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow uint64_t features; 56e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown 5772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow spinlock_t lock; /* protects the lists */ 58e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown struct bio_list reads; 59e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown struct bio_list writes; 6072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct bio_list failures; 6104788507686d184d8166918b70ef52311bc36dcbMikulas Patocka struct bio_list holds; /* bios are waiting until suspend */ 62e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown 631f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_region_hash *rh; 641f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_kcopyd_client *kcopyd_client; 6588be163abb5324bab09f5eff9646590eec5314ebMilan Broz struct dm_io_client *io_client; 6606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_t *read_record_pool; 6788be163abb5324bab09f5eff9646590eec5314ebMilan Broz 68e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown /* recovery */ 69e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown region_t nr_regions; 70e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown int in_sync; 71fc1ff9588a6d56258ff9576a31aa34f17757c666Jonathan Brassow int log_failure; 72b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow atomic_t suspend; 73e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown 7472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow atomic_t default_mirror; /* Default mirror */ 75e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown 766ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski struct workqueue_struct *kmirrord_wq; 776ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski struct work_struct kmirrord_work; 78a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka struct timer_list timer; 79a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka unsigned long timer_pending; 80a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka 8172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct work_struct trigger_event; 826ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski 831f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen unsigned nr_mirrors; 84e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown struct mirror mirror[0]; 85e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown}; 86e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown 871f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic void wakeup_mirrord(void *context) 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 891f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct mirror_set *ms = context; 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 916ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski queue_work(ms->kmirrord_wq, &ms->kmirrord_work); 926ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski} 936ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski 94a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patockastatic void delayed_wake_fn(unsigned long data) 95a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka{ 96a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka struct mirror_set *ms = (struct mirror_set *) data; 97a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka 98a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka clear_bit(0, &ms->timer_pending); 991f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_mirrord(ms); 100a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka} 101a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka 102a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patockastatic void delayed_wake(struct mirror_set *ms) 103a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka{ 104a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka if (test_and_set_bit(0, &ms->timer_pending)) 105a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka return; 106a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka 107a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka ms->timer.expires = jiffies + HZ / 5; 108a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka ms->timer.data = (unsigned long) ms; 109a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka ms->timer.function = delayed_wake_fn; 110a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka add_timer(&ms->timer); 111a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka} 112a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka 1131f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic void wakeup_all_recovery_waiters(void *context) 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1151f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wake_up_all(&_kmirrord_recovery_stopped); 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1181f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic void queue_bio(struct mirror_set *ms, struct bio *bio, int rw) 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long flags; 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int should_wake = 0; 1221f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct bio_list *bl; 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1241f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen bl = (rw == WRITE) ? &ms->writes : &ms->reads; 1251f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen spin_lock_irqsave(&ms->lock, flags); 1261f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen should_wake = !(bl->head); 1271f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen bio_list_add(bl, bio); 1281f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen spin_unlock_irqrestore(&ms->lock, flags); 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (should_wake) 1311f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_mirrord(ms); 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1341f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic void dispatch_bios(void *context, struct bio_list *bio_list) 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1361f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct mirror_set *ms = context; 1371f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct bio *bio; 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1391f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen while ((bio = bio_list_pop(bio_list))) 1401f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen queue_bio(ms, bio, WRITE); 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow#define MIN_READ_RECORDS 20 14406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstruct dm_raid1_read_record { 14506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct mirror *m; 14606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct dm_bio_details details; 14706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow}; 14806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 14995f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patockastatic struct kmem_cache *_dm_raid1_read_record_cache; 15095f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Every mirror should look like this one. 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define DEFAULT_MIRROR 0 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 15706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * This is yucky. We squirrel the mirror struct away inside 15806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * bi_next for read/write buffers. This is safe since the bh 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * doesn't get submitted to the lower levels of block layer. 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 16106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic struct mirror *bio_get_m(struct bio *bio) 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 16306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return (struct mirror *) bio->bi_next; 1641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 16606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic void bio_set_m(struct bio *bio, struct mirror *m) 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 16806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio->bi_next = (struct bio *) m; 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 17172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowstatic struct mirror *get_default_mirror(struct mirror_set *ms) 17272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow{ 17372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow return &ms->mirror[atomic_read(&ms->default_mirror)]; 17472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow} 17572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 17672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowstatic void set_default_mirror(struct mirror *m) 17772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow{ 17872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct mirror_set *ms = m->ms; 17972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct mirror *m0 = &(ms->mirror[0]); 18072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 18172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow atomic_set(&ms->default_mirror, m - m0); 18272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow} 18372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 18472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow/* fail_mirror 18572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * @m: mirror device to fail 18672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * @error_type: one of the enum's, DM_RAID1_*_ERROR 18772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * 18872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * If errors are being handled, record the type of 18972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * error encountered for this device. If this type 19072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * of error has already been recorded, we can return; 19172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * otherwise, we must signal userspace by triggering 19272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * an event. Additionally, if the device is the 19372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * primary device, we must choose a new primary, but 19472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * only if the mirror is in-sync. 19572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * 19672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * This function must not block. 19772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow */ 19872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowstatic void fail_mirror(struct mirror *m, enum dm_raid1_error error_type) 19972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow{ 20072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct mirror_set *ms = m->ms; 20172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct mirror *new; 20272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 20372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow /* 20472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * error_count is used for nothing more than a 20572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * simple way to tell if a device has encountered 20672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * errors. 20772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow */ 20872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow atomic_inc(&m->error_count); 20972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 21072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (test_and_set_bit(error_type, &m->error_type)) 21172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow return; 21272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 213d460c65a6a9ec9e0d284864ec3a9a2d1b73f0e43Jonathan Brassow if (!errors_handled(ms)) 214d460c65a6a9ec9e0d284864ec3a9a2d1b73f0e43Jonathan Brassow return; 215d460c65a6a9ec9e0d284864ec3a9a2d1b73f0e43Jonathan Brassow 21672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (m != get_default_mirror(ms)) 21772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow goto out; 21872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 21972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (!ms->in_sync) { 22072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow /* 22172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * Better to issue requests to same failing device 22272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * than to risk returning corrupt data. 22372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow */ 22472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow DMERR("Primary mirror (%s) failed while out-of-sync: " 22572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow "Reads may fail.", m->dev->name); 22672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow goto out; 22772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow } 22872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 22972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow for (new = ms->mirror; new < ms->mirror + ms->nr_mirrors; new++) 23072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (!atomic_read(&new->error_count)) { 23172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow set_default_mirror(new); 23272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow break; 23372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow } 23472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 23572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (unlikely(new == ms->mirror + ms->nr_mirrors)) 23672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow DMWARN("All sides of mirror have failed."); 23772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 23872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowout: 23972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow schedule_work(&ms->trigger_event); 24072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow} 24172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 242c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patockastatic int mirror_flush(struct dm_target *ti) 243c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka{ 244c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka struct mirror_set *ms = ti->private; 245c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka unsigned long error_bits; 246c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka 247c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka unsigned int i; 248c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka struct dm_io_region io[ms->nr_mirrors]; 249c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka struct mirror *m; 250c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka struct dm_io_request io_req = { 251c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka .bi_rw = WRITE_BARRIER, 252c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka .mem.type = DM_IO_KMEM, 253c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka .mem.ptr.bvec = NULL, 254c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka .client = ms->io_client, 255c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka }; 256c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka 257c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) { 258c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka io[i].bdev = m->dev->bdev; 259c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka io[i].sector = 0; 260c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka io[i].count = 0; 261c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka } 262c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka 263c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka error_bits = -1; 264c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka dm_io(&io_req, ms->nr_mirrors, io, &error_bits); 265c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka if (unlikely(error_bits != 0)) { 266c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka for (i = 0; i < ms->nr_mirrors; i++) 267c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka if (test_bit(i, &error_bits)) 268c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka fail_mirror(ms->mirror + i, 26964b30c46e866bbff8a9e17883a18636adc358455Mikulas Patocka DM_RAID1_FLUSH_ERROR); 270c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka return -EIO; 271c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka } 272c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka 273c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka return 0; 274c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka} 275c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Recovery. 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * When a mirror is first activated we may find that some regions 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * are in the no-sync state. We have to recover these by 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * recopying from the default mirror to all the others. 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *---------------------------------------------------------------*/ 2834cdc1d1fa5c5ac14dc21be19832f02fd0b83867eAlasdair G Kergonstatic void recovery_complete(int read_err, unsigned long write_err, 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds void *context) 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2861f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_region *reg = context; 2871f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct mirror_set *ms = dm_rh_region_context(reg); 2888f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow int m, bit = 0; 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2908f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow if (read_err) { 291f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow /* Read error means the failure of default mirror. */ 292f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow DMERR_LIMIT("Unable to read primary mirror during recovery"); 2938f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow fail_mirror(get_default_mirror(ms), DM_RAID1_SYNC_ERROR); 2948f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow } 295f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow 2968f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow if (write_err) { 2974cdc1d1fa5c5ac14dc21be19832f02fd0b83867eAlasdair G Kergon DMERR_LIMIT("Write error during recovery (error = 0x%lx)", 298f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow write_err); 2998f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow /* 3008f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow * Bits correspond to devices (excluding default mirror). 3018f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow * The default mirror cannot change during recovery. 3028f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow */ 3038f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow for (m = 0; m < ms->nr_mirrors; m++) { 3048f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow if (&ms->mirror[m] == get_default_mirror(ms)) 3058f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow continue; 3068f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow if (test_bit(bit, &write_err)) 3078f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow fail_mirror(ms->mirror + m, 3088f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow DM_RAID1_SYNC_ERROR); 3098f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow bit++; 3108f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow } 3118f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow } 312f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow 3131f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_recovery_end(reg, !(read_err || write_err)); 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3161f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic int recover(struct mirror_set *ms, struct dm_region *reg) 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int r; 3191f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen unsigned i; 320eb69aca5d3370b81450d68edeebc2bb9a3eb9689Heinz Mauelshagen struct dm_io_region from, to[DM_KCOPYD_MAX_REGIONS], *dest; 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror *m; 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long flags = 0; 3231f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen region_t key = dm_rh_get_region_key(reg); 3241f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen sector_t region_size = dm_rh_get_region_size(ms->rh); 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* fill in the source */ 32772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow m = get_default_mirror(ms); 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds from.bdev = m->dev->bdev; 3291f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen from.sector = m->offset + dm_rh_region_to_sector(ms->rh, key); 3301f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen if (key == (ms->nr_regions - 1)) { 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The final region may be smaller than 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * region_size. 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3351f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen from.count = ms->ti->len & (region_size - 1); 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!from.count) 3371f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen from.count = region_size; 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else 3391f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen from.count = region_size; 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* fill in the destinations */ 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0, dest = to; i < ms->nr_mirrors; i++) { 34372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (&ms->mirror[i] == get_default_mirror(ms)) 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds m = ms->mirror + i; 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dest->bdev = m->dev->bdev; 3481f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dest->sector = m->offset + dm_rh_region_to_sector(ms->rh, key); 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dest->count = from.count; 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dest++; 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* hand to kcopyd */ 354f7c83e2e4783c4f7abe6f3a85a8c5e210f98bc7bJonathan Brassow if (!errors_handled(ms)) 355f7c83e2e4783c4f7abe6f3a85a8c5e210f98bc7bJonathan Brassow set_bit(DM_KCOPYD_IGNORE_ERROR, &flags); 356f7c83e2e4783c4f7abe6f3a85a8c5e210f98bc7bJonathan Brassow 357eb69aca5d3370b81450d68edeebc2bb9a3eb9689Heinz Mauelshagen r = dm_kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to, 358eb69aca5d3370b81450d68edeebc2bb9a3eb9689Heinz Mauelshagen flags, recovery_complete, reg); 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return r; 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void do_recovery(struct mirror_set *ms) 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3651f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_region *reg; 3661f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int r; 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Start quiescing some regions. 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3721f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_recovery_prepare(ms->rh); 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copy any already quiesced regions. 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3771f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen while ((reg = dm_rh_recovery_start(ms->rh))) { 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds r = recover(ms, reg); 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (r) 3801f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_recovery_end(reg, 0); 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Update the in sync flag. 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!ms->in_sync && 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (log->type->get_sync_count(log) == ms->nr_regions)) { 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* the sync is complete */ 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dm_table_event(ms->ti->table); 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->in_sync = 1; 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Reads 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *---------------------------------------------------------------*/ 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector) 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 39906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct mirror *m = get_default_mirror(ms); 40006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 40106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow do { 40206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (likely(!atomic_read(&m->error_count))) 40306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return m; 40406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 40506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (m-- == ms->mirror) 40606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m += ms->nr_mirrors; 40706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } while (m != get_default_mirror(ms)); 40806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 40906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return NULL; 41006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 41106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 41206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic int default_ok(struct mirror *m) 41306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 41406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct mirror *default_mirror = get_default_mirror(m->ms); 41506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 41606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return !atomic_read(&default_mirror->error_count); 41706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 41806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 41906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic int mirror_available(struct mirror_set *ms, struct bio *bio) 42006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 4211f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 4221f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen region_t region = dm_rh_bio_to_region(ms->rh, bio); 42306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 4241f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen if (log->type->in_sync(log, region, 0)) 42506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return choose_mirror(ms, bio->bi_sector) ? 1 : 0; 42606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 42706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return 0; 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * remap a buffer to a particular mirror. 4321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 43306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic sector_t map_sector(struct mirror *m, struct bio *bio) 43406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 4354184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka if (unlikely(!bio->bi_size)) 4364184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka return 0; 43706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return m->offset + (bio->bi_sector - m->ms->ti->begin); 43806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 43906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 44006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic void map_bio(struct mirror *m, struct bio *bio) 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio->bi_bdev = m->dev->bdev; 44306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio->bi_sector = map_sector(m, bio); 44406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 44506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 44622a1ceb1e6a7fbce95a1531ff10bb4fb036d4a37Heinz Mauelshagenstatic void map_region(struct dm_io_region *io, struct mirror *m, 44706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct bio *bio) 44806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 44906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow io->bdev = m->dev->bdev; 45006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow io->sector = map_sector(m, bio); 45106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow io->count = bio->bi_size >> 9; 45206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 45306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 45404788507686d184d8166918b70ef52311bc36dcbMikulas Patockastatic void hold_bio(struct mirror_set *ms, struct bio *bio) 45504788507686d184d8166918b70ef52311bc36dcbMikulas Patocka{ 45604788507686d184d8166918b70ef52311bc36dcbMikulas Patocka /* 45704788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * If device is suspended, complete the bio. 45804788507686d184d8166918b70ef52311bc36dcbMikulas Patocka */ 45904788507686d184d8166918b70ef52311bc36dcbMikulas Patocka if (atomic_read(&ms->suspend)) { 46004788507686d184d8166918b70ef52311bc36dcbMikulas Patocka if (dm_noflush_suspending(ms->ti)) 46104788507686d184d8166918b70ef52311bc36dcbMikulas Patocka bio_endio(bio, DM_ENDIO_REQUEUE); 46204788507686d184d8166918b70ef52311bc36dcbMikulas Patocka else 46304788507686d184d8166918b70ef52311bc36dcbMikulas Patocka bio_endio(bio, -EIO); 46404788507686d184d8166918b70ef52311bc36dcbMikulas Patocka return; 46504788507686d184d8166918b70ef52311bc36dcbMikulas Patocka } 46604788507686d184d8166918b70ef52311bc36dcbMikulas Patocka 46704788507686d184d8166918b70ef52311bc36dcbMikulas Patocka /* 46804788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * Hold bio until the suspend is complete. 46904788507686d184d8166918b70ef52311bc36dcbMikulas Patocka */ 47004788507686d184d8166918b70ef52311bc36dcbMikulas Patocka spin_lock_irq(&ms->lock); 47104788507686d184d8166918b70ef52311bc36dcbMikulas Patocka bio_list_add(&ms->holds, bio); 47204788507686d184d8166918b70ef52311bc36dcbMikulas Patocka spin_unlock_irq(&ms->lock); 47304788507686d184d8166918b70ef52311bc36dcbMikulas Patocka} 47404788507686d184d8166918b70ef52311bc36dcbMikulas Patocka 47506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow/*----------------------------------------------------------------- 47606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * Reads 47706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow *---------------------------------------------------------------*/ 47806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic void read_callback(unsigned long error, void *context) 47906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 48006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct bio *bio = context; 48106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct mirror *m; 48206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 48306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m = bio_get_m(bio); 48406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_set_m(bio, NULL); 48506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 48606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (likely(!error)) { 48706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_endio(bio, 0); 48806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return; 48906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 49006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 49106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow fail_mirror(m, DM_RAID1_READ_ERROR); 49206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 49306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (likely(default_ok(m)) || mirror_available(m->ms, bio)) { 49406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow DMWARN_LIMIT("Read failure on mirror device %s. " 49506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow "Trying alternative device.", 49606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m->dev->name); 49706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow queue_bio(m->ms, bio, bio_rw(bio)); 49806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return; 49906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 50006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 50106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow DMERR_LIMIT("Read failure on mirror device %s. Failing I/O.", 50206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m->dev->name); 50306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_endio(bio, -EIO); 50406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 50506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 50606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow/* Asynchronous read. */ 50706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic void read_async_bio(struct mirror *m, struct bio *bio) 50806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 50922a1ceb1e6a7fbce95a1531ff10bb4fb036d4a37Heinz Mauelshagen struct dm_io_region io; 51006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct dm_io_request io_req = { 51106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .bi_rw = READ, 51206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .mem.type = DM_IO_BVEC, 51306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .mem.ptr.bvec = bio->bi_io_vec + bio->bi_idx, 51406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .notify.fn = read_callback, 51506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .notify.context = bio, 51606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .client = m->ms->io_client, 51706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow }; 51806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 51906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_region(&io, m, bio); 52006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_set_m(bio, m); 5211f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen BUG_ON(dm_io(&io_req, 1, &io, NULL)); 5221f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen} 5231f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen 5241f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic inline int region_in_sync(struct mirror_set *ms, region_t region, 5251f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen int may_block) 5261f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen{ 5271f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen int state = dm_rh_get_state(ms->rh, region, may_block); 5281f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen return state == DM_RH_CLEAN || state == DM_RH_DIRTY; 5291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void do_reads(struct mirror_set *ms, struct bio_list *reads) 5321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds region_t region; 5341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct bio *bio; 5351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror *m; 5361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while ((bio = bio_list_pop(reads))) { 5381f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen region = dm_rh_bio_to_region(ms->rh, bio); 53906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m = get_default_mirror(ms); 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We can only read balance if the region is in sync. 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5441f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen if (likely(region_in_sync(ms, region, 1))) 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds m = choose_mirror(ms, bio->bi_sector); 54606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow else if (m && atomic_read(&m->error_count)) 54706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m = NULL; 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 54906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (likely(m)) 55006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow read_async_bio(m, bio); 55106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow else 55206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_endio(bio, -EIO); 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 5571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Writes. 5581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We do different things with the write io depending on the 5601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * state of the region that it's in: 5611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * SYNC: increment pending, use kcopyd to write to *all* mirrors 5631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * RECOVERING: delay the io until recovery completes 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * NOSYNC: increment pending, just write to the default mirror 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *---------------------------------------------------------------*/ 56672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 56772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void write_callback(unsigned long error, void *context) 5691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 57072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow unsigned i, ret = 0; 5711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct bio *bio = (struct bio *) context; 5721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms; 57372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow int uptodate = 0; 57472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow int should_wake = 0; 57572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow unsigned long flags; 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 57706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow ms = bio_get_m(bio)->ms; 57806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_set_m(bio, NULL); 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 5811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * NOTE: We don't decrement the pending count here, 5821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * instead it is done by the targets endio function. 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This way we handle both writes to SYNC and NOSYNC 5841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * regions with the same code. 5851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 58672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (likely(!error)) 58772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow goto out; 5881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 58972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow for (i = 0; i < ms->nr_mirrors; i++) 59072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (test_bit(i, &error)) 59172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow fail_mirror(ms->mirror + i, DM_RAID1_WRITE_ERROR); 59272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow else 59372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow uptodate = 1; 59472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 59572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (unlikely(!uptodate)) { 59672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow DMERR("All replicated volumes dead, failing I/O"); 59772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow /* None of the writes succeeded, fail the I/O. */ 59872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow ret = -EIO; 59972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow } else if (errors_handled(ms)) { 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 60172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * Need to raise event. Since raising 60272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * events can block, we need to do it in 60372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * the main thread. 6041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 60572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow spin_lock_irqsave(&ms->lock, flags); 60672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (!ms->failures.head) 60772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow should_wake = 1; 60872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow bio_list_add(&ms->failures, bio); 60972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow spin_unlock_irqrestore(&ms->lock, flags); 61072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (should_wake) 6111f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_mirrord(ms); 61272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow return; 6131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 61472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowout: 61572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow bio_endio(bio, ret); 6161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void do_write(struct mirror_set *ms, struct bio *bio) 6191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int i; 62122a1ceb1e6a7fbce95a1531ff10bb4fb036d4a37Heinz Mauelshagen struct dm_io_region io[ms->nr_mirrors], *dest = io; 6221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror *m; 62388be163abb5324bab09f5eff9646590eec5314ebMilan Broz struct dm_io_request io_req = { 6244184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka .bi_rw = WRITE | (bio->bi_rw & WRITE_BARRIER), 62588be163abb5324bab09f5eff9646590eec5314ebMilan Broz .mem.type = DM_IO_BVEC, 62688be163abb5324bab09f5eff9646590eec5314ebMilan Broz .mem.ptr.bvec = bio->bi_io_vec + bio->bi_idx, 62788be163abb5324bab09f5eff9646590eec5314ebMilan Broz .notify.fn = write_callback, 62888be163abb5324bab09f5eff9646590eec5314ebMilan Broz .notify.context = bio, 62988be163abb5324bab09f5eff9646590eec5314ebMilan Broz .client = ms->io_client, 63088be163abb5324bab09f5eff9646590eec5314ebMilan Broz }; 6311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 63206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) 63306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_region(dest++, m, bio); 6341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 63506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow /* 63606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * Use default mirror because we only need it to retrieve the reference 63706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * to the mirror set in write_callback(). 63806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow */ 63906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_set_m(bio, get_default_mirror(ms)); 64088be163abb5324bab09f5eff9646590eec5314ebMilan Broz 6411f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen BUG_ON(dm_io(&io_req, ms->nr_mirrors, io, NULL)); 6421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void do_writes(struct mirror_set *ms, struct bio_list *writes) 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int state; 6471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct bio *bio; 6481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct bio_list sync, nosync, recover, *this_list = NULL; 6497513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow struct bio_list requeue; 6507513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 6517513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow region_t region; 6521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!writes->head) 6541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 6551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 6571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Classify each write. 6581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_init(&sync); 6601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_init(&nosync); 6611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_init(&recover); 6627513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow bio_list_init(&requeue); 6631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while ((bio = bio_list_pop(writes))) { 6654184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka if (unlikely(bio_empty_barrier(bio))) { 6664184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka bio_list_add(&sync, bio); 6674184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka continue; 6684184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka } 6694184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka 6707513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow region = dm_rh_bio_to_region(ms->rh, bio); 6717513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow 6727513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow if (log->type->is_remote_recovering && 6737513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow log->type->is_remote_recovering(log, region)) { 6747513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow bio_list_add(&requeue, bio); 6757513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow continue; 6767513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow } 6777513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow 6787513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow state = dm_rh_get_state(ms->rh, region, 1); 6791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (state) { 6801f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen case DM_RH_CLEAN: 6811f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen case DM_RH_DIRTY: 6821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this_list = &sync; 6831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 6841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6851f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen case DM_RH_NOSYNC: 6861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this_list = &nosync; 6871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 6881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6891f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen case DM_RH_RECOVERING: 6901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this_list = &recover; 6911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 6921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_add(this_list, bio); 6951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 6987513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow * Add bios that are delayed due to remote recovery 6997513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow * back on to the write queue 7007513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow */ 7017513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow if (unlikely(requeue.head)) { 7027513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow spin_lock_irq(&ms->lock); 7037513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow bio_list_merge(&ms->writes, &requeue); 7047513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow spin_unlock_irq(&ms->lock); 70569885683d22d8c05910fd808c01fdce1322739b4Mikulas Patocka delayed_wake(ms); 7067513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow } 7077513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow 7087513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow /* 7091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Increment the pending counts for any regions that will 7101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * be written to (writes to recover regions are going to 7111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * be delayed). 7121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7131f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_inc_pending(ms->rh, &sync); 7141f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_inc_pending(ms->rh, &nosync); 715d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow 716d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow /* 717d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow * If the flush fails on a previous call and succeeds here, 718d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow * we must not reset the log_failure variable. We need 719d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow * userspace interaction to do that. 720d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow */ 721d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow ms->log_failure = dm_rh_flush(ms->rh) ? 1 : ms->log_failure; 7221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 7241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Dispatch io. 7251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 726b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow if (unlikely(ms->log_failure)) { 727b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow spin_lock_irq(&ms->lock); 728b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow bio_list_merge(&ms->failures, &sync); 729b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow spin_unlock_irq(&ms->lock); 7301f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_mirrord(ms); 731b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow } else 732fc1ff9588a6d56258ff9576a31aa34f17757c666Jonathan Brassow while ((bio = bio_list_pop(&sync))) 733b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow do_write(ms, bio); 7341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while ((bio = bio_list_pop(&recover))) 7361f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_delay(ms->rh, bio); 7371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while ((bio = bio_list_pop(&nosync))) { 73906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_bio(get_default_mirror(ms), bio); 7401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds generic_make_request(bio); 7411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 74472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowstatic void do_failures(struct mirror_set *ms, struct bio_list *failures) 74572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow{ 74672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct bio *bio; 74772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 7480f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka if (likely(!failures->head)) 74972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow return; 75072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 751b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow /* 752b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * If the log has failed, unattempted writes are being 7530f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka * put on the holds list. We can't issue those writes 754b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * until a log has been marked, so we must store them. 755b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * 756b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * If a 'noflush' suspend is in progress, we can requeue 757b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * the I/O's to the core. This give userspace a chance 758b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * to reconfigure the mirror, at which point the core 759b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * will reissue the writes. If the 'noflush' flag is 760b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * not set, we have no choice but to return errors. 761b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * 762b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * Some writes on the failures list may have been 763b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * submitted before the log failure and represent a 764b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * failure to write to one of the devices. It is ok 765b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * for us to treat them the same and requeue them 766b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * as well. 767b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow */ 768b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 7690f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka while ((bio = bio_list_pop(failures))) { 7700f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka if (ms->log_failure) 7710f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka hold_bio(ms, bio); 7720f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka else { 7730f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka ms->in_sync = 0; 7740f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka dm_rh_mark_nosync(ms->rh, bio, bio->bi_size, 0); 7750f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka } 776b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow } 77772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow} 77872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 77972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowstatic void trigger_event(struct work_struct *work) 78072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow{ 78172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct mirror_set *ms = 78272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow container_of(work, struct mirror_set, trigger_event); 78372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 78472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow dm_table_event(ms->ti->table); 78572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow} 78672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 7871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 7881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * kmirrord 7891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *---------------------------------------------------------------*/ 790a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patockastatic void do_mirror(struct work_struct *work) 7911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 7921f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct mirror_set *ms = container_of(work, struct mirror_set, 7931f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen kmirrord_work); 79472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct bio_list reads, writes, failures; 79572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow unsigned long flags; 7961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 79772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow spin_lock_irqsave(&ms->lock, flags); 7981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds reads = ms->reads; 7991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writes = ms->writes; 80072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow failures = ms->failures; 8011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_init(&ms->reads); 8021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_init(&ms->writes); 80372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow bio_list_init(&ms->failures); 80472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow spin_unlock_irqrestore(&ms->lock, flags); 8051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8061f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_update_states(ms->rh, errors_handled(ms)); 8071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do_recovery(ms); 8081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do_reads(ms, &reads); 8091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do_writes(ms, &writes); 81072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow do_failures(ms, &failures); 8117ff14a36159d947872870e7a3e9dcaebc46b23ebMikulas Patocka 8127ff14a36159d947872870e7a3e9dcaebc46b23ebMikulas Patocka dm_table_unplug_all(ms->ti->table); 8131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 8161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Target functions 8171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *---------------------------------------------------------------*/ 8181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct mirror_set *alloc_context(unsigned int nr_mirrors, 8191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint32_t region_size, 8201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct dm_target *ti, 821416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen struct dm_dirty_log *dl) 8221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t len; 8241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = NULL; 8251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len = sizeof(*ms) + (sizeof(ms->mirror[0]) * nr_mirrors); 8271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 828dd00cc486ab1c17049a535413d1751ef3482141cYoann Padioleau ms = kzalloc(len, GFP_KERNEL); 8291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!ms) { 83072d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Cannot allocate mirror context"; 8311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_init(&ms->lock); 8351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->ti = ti; 8371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->nr_mirrors = nr_mirrors; 8381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->nr_regions = dm_sector_div_up(ti->len, region_size); 8391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->in_sync = 0; 840b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow ms->log_failure = 0; 841b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow atomic_set(&ms->suspend, 0); 84272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow atomic_set(&ms->default_mirror, DEFAULT_MIRROR); 8431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 84495f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka ms->read_record_pool = mempool_create_slab_pool(MIN_READ_RECORDS, 84595f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka _dm_raid1_read_record_cache); 84695f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka 84706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (!ms->read_record_pool) { 84806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow ti->error = "Error creating mirror read_record_pool"; 84906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow kfree(ms); 85006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return NULL; 85106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 85206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 85388be163abb5324bab09f5eff9646590eec5314ebMilan Broz ms->io_client = dm_io_client_create(DM_IO_PAGES); 85488be163abb5324bab09f5eff9646590eec5314ebMilan Broz if (IS_ERR(ms->io_client)) { 85588be163abb5324bab09f5eff9646590eec5314ebMilan Broz ti->error = "Error creating dm_io client"; 85606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_destroy(ms->read_record_pool); 85788be163abb5324bab09f5eff9646590eec5314ebMilan Broz kfree(ms); 85888be163abb5324bab09f5eff9646590eec5314ebMilan Broz return NULL; 85988be163abb5324bab09f5eff9646590eec5314ebMilan Broz } 86088be163abb5324bab09f5eff9646590eec5314ebMilan Broz 8611f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen ms->rh = dm_region_hash_create(ms, dispatch_bios, wakeup_mirrord, 8621f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_all_recovery_waiters, 8631f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen ms->ti->begin, MAX_RECOVERY, 8641f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dl, region_size, ms->nr_regions); 8651f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen if (IS_ERR(ms->rh)) { 86672d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Error creating dirty region hash"; 867a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov dm_io_client_destroy(ms->io_client); 86806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_destroy(ms->read_record_pool); 8691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(ms); 8701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 8711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ms; 8741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void free_context(struct mirror_set *ms, struct dm_target *ti, 8771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int m) 8781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (m--) 8801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dm_put_device(ti, ms->mirror[m].dev); 8811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 88288be163abb5324bab09f5eff9646590eec5314ebMilan Broz dm_io_client_destroy(ms->io_client); 8831f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_region_hash_destroy(ms->rh); 88406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_destroy(ms->read_record_pool); 8851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(ms); 8861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int get_mirror(struct mirror_set *ms, struct dm_target *ti, 8891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int mirror, char **argv) 8901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8914ee218cd67b385759993a6c840ea45f0ee0a8b30Andrew Morton unsigned long long offset; 8921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8934ee218cd67b385759993a6c840ea45f0ee0a8b30Andrew Morton if (sscanf(argv[1], "%llu", &offset) != 1) { 89472d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Invalid offset"; 8951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 8961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (dm_get_device(ti, argv[0], offset, ti->len, 8991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dm_table_get_mode(ti->table), 9001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds &ms->mirror[mirror].dev)) { 90172d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Device lookup failure"; 9021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENXIO; 9031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 905aa5617c55357d86c9082ba1d66fa9795370c9954Jonathan Brassow ms->mirror[mirror].ms = ms; 90672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow atomic_set(&(ms->mirror[mirror].error_count), 0); 90772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow ms->mirror[mirror].error_type = 0; 9081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->mirror[mirror].offset = offset; 9091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 9111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 9141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Create dirty log: log_type #log_params <log_params> 9151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 916416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagenstatic struct dm_dirty_log *create_dirty_log(struct dm_target *ti, 9171f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen unsigned argc, char **argv, 9181f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen unsigned *args_used) 9191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9201f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen unsigned param_count; 921416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen struct dm_dirty_log *dl; 9221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (argc < 2) { 92472d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Insufficient mirror log arguments"; 9251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 9261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (sscanf(argv[1], "%u", ¶m_count) != 1) { 92972d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Invalid mirror log argument count"; 9301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 9311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *args_used = 2 + param_count; 9341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (argc < *args_used) { 93672d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Insufficient mirror log arguments"; 9371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 9381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 940c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka dl = dm_dirty_log_create(argv[0], ti, mirror_flush, param_count, 941c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka argv + 2); 9421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!dl) { 94372d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Error creating mirror dirty log"; 9441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 9451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return dl; 9481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 950a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassowstatic int parse_features(struct mirror_set *ms, unsigned argc, char **argv, 951a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow unsigned *args_used) 952a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow{ 953a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow unsigned num_features; 954a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow struct dm_target *ti = ms->ti; 955a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 956a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow *args_used = 0; 957a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 958a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (!argc) 959a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow return 0; 960a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 961a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (sscanf(argv[0], "%u", &num_features) != 1) { 962a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ti->error = "Invalid number of features"; 963a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow return -EINVAL; 964a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow } 965a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 966a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow argc--; 967a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow argv++; 968a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow (*args_used)++; 969a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 970a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (num_features > argc) { 971a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ti->error = "Not enough arguments to support feature count"; 972a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow return -EINVAL; 973a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow } 974a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 975a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (!strcmp("handle_errors", argv[0])) 976a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ms->features |= DM_RAID1_HANDLE_ERRORS; 977a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow else { 978a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ti->error = "Unrecognised feature requested"; 979a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow return -EINVAL; 980a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow } 981a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 982a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow (*args_used)++; 983a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 984a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow return 0; 985a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow} 986a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 9871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 9881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Construct a mirror mapping: 9891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 9901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * log_type #log_params <log_params> 9911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * #mirrors [mirror_path offset]{2,} 992a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow * [#features <features>] 9931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 9941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * log_type is "core" or "disk" 9951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * #log_params is between 1 and 3 996a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow * 997a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow * If present, features must be "handle_errors". 9981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 9991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv) 10001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 10011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int r; 10021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int nr_mirrors, m, args_used; 10031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms; 1004416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen struct dm_dirty_log *dl; 10051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dl = create_dirty_log(ti, argc, argv, &args_used); 10071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!dl) 10081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 10091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds argv += args_used; 10111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds argc -= args_used; 10121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!argc || sscanf(argv[0], "%u", &nr_mirrors) != 1 || 1014eb69aca5d3370b81450d68edeebc2bb9a3eb9689Heinz Mauelshagen nr_mirrors < 2 || nr_mirrors > DM_KCOPYD_MAX_REGIONS + 1) { 101572d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Invalid number of mirrors"; 1016416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen dm_dirty_log_destroy(dl); 10171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 10181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds argv++, argc--; 10211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1022a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (argc < nr_mirrors * 2) { 1023a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ti->error = "Too few mirror arguments"; 1024416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen dm_dirty_log_destroy(dl); 10251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 10261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms = alloc_context(nr_mirrors, dl->type->get_region_size(dl), ti, dl); 10291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!ms) { 1030416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen dm_dirty_log_destroy(dl); 10311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOMEM; 10321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Get the mirror parameter sets */ 10351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (m = 0; m < nr_mirrors; m++) { 10361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds r = get_mirror(ms, ti, m, argv); 10371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (r) { 10381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds free_context(ms, ti, m); 10391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return r; 10401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds argv += 2; 10421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds argc -= 2; 10431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ti->private = ms; 10461f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen ti->split_io = dm_rh_get_region_size(ms->rh); 10474184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka ti->num_flush_requests = 1; 10481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10496ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski ms->kmirrord_wq = create_singlethread_workqueue("kmirrord"); 10506ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski if (!ms->kmirrord_wq) { 10516ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski DMERR("couldn't start kmirrord"); 1052a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov r = -ENOMEM; 1053a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov goto err_free_context; 10546ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski } 10556ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski INIT_WORK(&ms->kmirrord_work, do_mirror); 1056a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka init_timer(&ms->timer); 1057a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka ms->timer_pending = 0; 105872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow INIT_WORK(&ms->trigger_event, trigger_event); 10596ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski 1060a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow r = parse_features(ms, argc, argv, &args_used); 1061a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov if (r) 1062a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov goto err_destroy_wq; 1063a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 1064a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow argv += args_used; 1065a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow argc -= args_used; 1066a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 1067f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow /* 1068f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * Any read-balancing addition depends on the 1069f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * DM_RAID1_HANDLE_ERRORS flag being present. 1070f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * This is because the decision to balance depends 1071f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * on the sync state of a region. If the above 1072f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * flag is not present, we ignore errors; and 1073f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * the sync state may be inaccurate. 1074f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow */ 1075f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow 1076a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (argc) { 1077a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ti->error = "Too many mirror arguments"; 1078a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov r = -EINVAL; 1079a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov goto err_destroy_wq; 1080a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow } 1081a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 10821f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen r = dm_kcopyd_client_create(DM_KCOPYD_PAGES, &ms->kcopyd_client); 1083a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov if (r) 1084a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov goto err_destroy_wq; 10851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10861f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_mirrord(ms); 10871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1088a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov 1089a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhoverr_destroy_wq: 1090a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov destroy_workqueue(ms->kmirrord_wq); 1091a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhoverr_free_context: 1092a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov free_context(ms, ti, ms->nr_mirrors); 1093a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov return r; 10941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 10951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void mirror_dtr(struct dm_target *ti) 10971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 10981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = (struct mirror_set *) ti->private; 10991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1100a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka del_timer_sync(&ms->timer); 11016ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski flush_workqueue(ms->kmirrord_wq); 110218776c7316545482a02bfaa2629a2aa1afc48357Mikulas Patocka flush_scheduled_work(); 1103eb69aca5d3370b81450d68edeebc2bb9a3eb9689Heinz Mauelshagen dm_kcopyd_client_destroy(ms->kcopyd_client); 11046ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski destroy_workqueue(ms->kmirrord_wq); 11051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds free_context(ms, ti, ms->nr_mirrors); 11061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 11091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Mirror mapping function 11101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 11111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mirror_map(struct dm_target *ti, struct bio *bio, 11121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds union map_info *map_context) 11131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int r, rw = bio_rw(bio); 11151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror *m; 11161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = ti->private; 111706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct dm_raid1_read_record *read_record = NULL; 11181f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 11191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rw == WRITE) { 112106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow /* Save region for mirror_end_io() handler */ 11221f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen map_context->ll = dm_rh_bio_to_region(ms->rh, bio); 11231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds queue_bio(ms, bio, rw); 1124d2a7ad29a810441e9dacbaddcc2f0c6045390008Kiyoshi Ueda return DM_MAPIO_SUBMITTED; 11251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11271f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen r = log->type->in_sync(log, dm_rh_bio_to_region(ms->rh, bio), 0); 11281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (r < 0 && r != -EWOULDBLOCK) 11291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return r; 11301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 113206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * If region is not in-sync queue the bio. 11331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 113406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (!r || (r == -EWOULDBLOCK)) { 113506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (rw == READA) 113606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return -EWOULDBLOCK; 11371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds queue_bio(ms, bio, rw); 1139d2a7ad29a810441e9dacbaddcc2f0c6045390008Kiyoshi Ueda return DM_MAPIO_SUBMITTED; 11401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 114206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow /* 114306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * The region is in-sync and we can perform reads directly. 114406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * Store enough information so we can retry if it fails. 114506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow */ 11461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds m = choose_mirror(ms, bio->bi_sector); 114706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (unlikely(!m)) 11481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 11491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 115006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow read_record = mempool_alloc(ms->read_record_pool, GFP_NOIO); 115106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (likely(read_record)) { 115206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow dm_bio_record(&read_record->details, bio); 115306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_context->ptr = read_record; 115406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow read_record->m = m; 115506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 115606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 115706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_bio(m, bio); 115806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 1159d2a7ad29a810441e9dacbaddcc2f0c6045390008Kiyoshi Ueda return DM_MAPIO_REMAPPED; 11601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mirror_end_io(struct dm_target *ti, struct bio *bio, 11631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int error, union map_info *map_context) 11641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int rw = bio_rw(bio); 11661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = (struct mirror_set *) ti->private; 116706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct mirror *m = NULL; 116806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct dm_bio_details *bd = NULL; 116906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct dm_raid1_read_record *read_record = map_context->ptr; 11701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 11721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We need to dec pending if this was a write. 11731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 117406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (rw == WRITE) { 11754184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka if (likely(!bio_empty_barrier(bio))) 11764184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka dm_rh_dec(ms->rh, map_context->ll); 117706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return error; 117806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 11791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 118006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (error == -EOPNOTSUPP) 118106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow goto out; 118206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 11831f98a13f623e0ef666690a18c1250335fc6d7ef1Jens Axboe if ((error == -EWOULDBLOCK) && bio_rw_flagged(bio, BIO_RW_AHEAD)) 118406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow goto out; 118506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 118606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (unlikely(error)) { 118706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (!read_record) { 118806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow /* 118906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * There wasn't enough memory to record necessary 119006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * information for a retry or there was no other 119106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * mirror in-sync. 119206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow */ 1193e03f1a842287480aa03732612148c0d333baca61Adrian Bunk DMERR_LIMIT("Mirror read failed."); 119406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return -EIO; 119506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 1196e03f1a842287480aa03732612148c0d333baca61Adrian Bunk 1197e03f1a842287480aa03732612148c0d333baca61Adrian Bunk m = read_record->m; 1198e03f1a842287480aa03732612148c0d333baca61Adrian Bunk 119906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow DMERR("Mirror read failed from %s. Trying alternative device.", 120006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m->dev->name); 120106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 120206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow fail_mirror(m, DM_RAID1_READ_ERROR); 120306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 120406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow /* 120506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * A failed read is requeued for another attempt using an intact 120606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * mirror. 120706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow */ 120806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (default_ok(m) || mirror_available(ms, bio)) { 120906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bd = &read_record->details; 121006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 121106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow dm_bio_restore(bd, bio); 121206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_free(read_record, ms->read_record_pool); 121306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_context->ptr = NULL; 121406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow queue_bio(ms, bio, rw); 121506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return 1; 121606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 121706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow DMERR("All replicated volumes dead, failing I/O"); 121806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 121906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 122006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowout: 122106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (read_record) { 122206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_free(read_record, ms->read_record_pool); 122306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_context->ptr = NULL; 122406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 122506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 122606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return error; 12271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1229b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassowstatic void mirror_presuspend(struct dm_target *ti) 12301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = (struct mirror_set *) ti->private; 12321f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 12331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 123404788507686d184d8166918b70ef52311bc36dcbMikulas Patocka struct bio_list holds; 123504788507686d184d8166918b70ef52311bc36dcbMikulas Patocka struct bio *bio; 123604788507686d184d8166918b70ef52311bc36dcbMikulas Patocka 1237b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow atomic_set(&ms->suspend, 1); 1238b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 1239b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow /* 1240b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * We must finish up all the work that we've 1241b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * generated (i.e. recovery work). 1242b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow */ 12431f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_stop_recovery(ms->rh); 124433184048dc4f9d5550d3b6a88c8e0ff92033eb6eJonathan E Brassow 124533184048dc4f9d5550d3b6a88c8e0ff92033eb6eJonathan E Brassow wait_event(_kmirrord_recovery_stopped, 12461f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen !dm_rh_recovery_in_flight(ms->rh)); 124733184048dc4f9d5550d3b6a88c8e0ff92033eb6eJonathan E Brassow 1248b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow if (log->type->presuspend && log->type->presuspend(log)) 1249b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow /* FIXME: need better error handling */ 1250b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow DMWARN("log presuspend failed"); 1251b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 1252b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow /* 1253b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * Now that recovery is complete/stopped and the 1254b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * delayed bios are queued, we need to wait for 1255b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * the worker thread to complete. This way, 1256b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * we know that all of our I/O has been pushed. 1257b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow */ 1258b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow flush_workqueue(ms->kmirrord_wq); 125904788507686d184d8166918b70ef52311bc36dcbMikulas Patocka 126004788507686d184d8166918b70ef52311bc36dcbMikulas Patocka /* 126104788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * Now set ms->suspend is set and the workqueue flushed, no more 126204788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * entries can be added to ms->hold list, so process it. 126304788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * 126404788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * Bios can still arrive concurrently with or after this 126504788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * presuspend function, but they cannot join the hold list 126604788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * because ms->suspend is set. 126704788507686d184d8166918b70ef52311bc36dcbMikulas Patocka */ 126804788507686d184d8166918b70ef52311bc36dcbMikulas Patocka spin_lock_irq(&ms->lock); 126904788507686d184d8166918b70ef52311bc36dcbMikulas Patocka holds = ms->holds; 127004788507686d184d8166918b70ef52311bc36dcbMikulas Patocka bio_list_init(&ms->holds); 127104788507686d184d8166918b70ef52311bc36dcbMikulas Patocka spin_unlock_irq(&ms->lock); 127204788507686d184d8166918b70ef52311bc36dcbMikulas Patocka 127304788507686d184d8166918b70ef52311bc36dcbMikulas Patocka while ((bio = bio_list_pop(&holds))) 127404788507686d184d8166918b70ef52311bc36dcbMikulas Patocka hold_bio(ms, bio); 1275b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow} 1276b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 1277b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassowstatic void mirror_postsuspend(struct dm_target *ti) 1278b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow{ 1279b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow struct mirror_set *ms = ti->private; 12801f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 1281b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 12826b3df0d7a5e85ad2afd3eecc50e2dee59e876ae8Jonathan Brassow if (log->type->postsuspend && log->type->postsuspend(log)) 12831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* FIXME: need better error handling */ 1284b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow DMWARN("log postsuspend failed"); 12851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 12871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void mirror_resume(struct dm_target *ti) 12881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1289b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow struct mirror_set *ms = ti->private; 12901f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 1291b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 1292b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow atomic_set(&ms->suspend, 0); 12931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (log->type->resume && log->type->resume(log)) 12941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* FIXME: need better error handling */ 12951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DMWARN("log resume failed"); 12961f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_start_recovery(ms->rh); 12971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1299af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow/* 1300af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * device_status_char 1301af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * @m: mirror device/leg we want the status of 1302af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * 1303af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * We return one character representing the most severe error 1304af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * we have encountered. 1305af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * A => Alive - No failures 1306af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * D => Dead - A write failure occurred leaving mirror out-of-sync 1307af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * S => Sync - A sychronization failure occurred, mirror out-of-sync 1308af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * R => Read - A read failure occurred, mirror data unaffected 1309af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * 1310af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * Returns: <char> 1311af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow */ 1312af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassowstatic char device_status_char(struct mirror *m) 1313af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow{ 1314af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow if (!atomic_read(&(m->error_count))) 1315af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow return 'A'; 1316af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow 131764b30c46e866bbff8a9e17883a18636adc358455Mikulas Patocka return (test_bit(DM_RAID1_FLUSH_ERROR, &(m->error_type))) ? 'F' : 131864b30c46e866bbff8a9e17883a18636adc358455Mikulas Patocka (test_bit(DM_RAID1_WRITE_ERROR, &(m->error_type))) ? 'D' : 1319af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow (test_bit(DM_RAID1_SYNC_ERROR, &(m->error_type))) ? 'S' : 1320af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow (test_bit(DM_RAID1_READ_ERROR, &(m->error_type))) ? 'R' : 'U'; 1321af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow} 1322af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow 1323af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow 13241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mirror_status(struct dm_target *ti, status_type_t type, 13251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *result, unsigned int maxlen) 13261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1327315dcc226f066c1d3cef79283dcde807fe0e32d1Jonathan E Brassow unsigned int m, sz = 0; 13281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = (struct mirror_set *) ti->private; 13291f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 1330af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow char buffer[ms->nr_mirrors + 1]; 13311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (type) { 13331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATUSTYPE_INFO: 13341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DMEMIT("%d ", ms->nr_mirrors); 1335af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow for (m = 0; m < ms->nr_mirrors; m++) { 13361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DMEMIT("%s ", ms->mirror[m].dev->name); 1337af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow buffer[m] = device_status_char(&(ms->mirror[m])); 1338af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow } 1339af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow buffer[m] = '\0'; 13401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1341af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow DMEMIT("%llu/%llu 1 %s ", 13421f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen (unsigned long long)log->type->get_sync_count(log), 1343af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow (unsigned long long)ms->nr_regions, buffer); 1344315dcc226f066c1d3cef79283dcde807fe0e32d1Jonathan E Brassow 13451f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen sz += log->type->status(log, type, result+sz, maxlen-sz); 1346315dcc226f066c1d3cef79283dcde807fe0e32d1Jonathan E Brassow 13471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 13481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATUSTYPE_TABLE: 13501f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen sz = log->type->status(log, type, result, maxlen); 1351315dcc226f066c1d3cef79283dcde807fe0e32d1Jonathan E Brassow 1352e52b8f6dbe18c879ad2b5013f991ec9e46813043Jonathan Brassow DMEMIT("%d", ms->nr_mirrors); 13531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (m = 0; m < ms->nr_mirrors; m++) 1354e52b8f6dbe18c879ad2b5013f991ec9e46813043Jonathan Brassow DMEMIT(" %s %llu", ms->mirror[m].dev->name, 1355b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow (unsigned long long)ms->mirror[m].offset); 1356a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 1357a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (ms->features & DM_RAID1_HANDLE_ERRORS) 1358a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow DMEMIT(" 1 handle_errors"); 13591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 13601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 13621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 13631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1364af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzerstatic int mirror_iterate_devices(struct dm_target *ti, 1365af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer iterate_devices_callout_fn fn, void *data) 1366af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer{ 1367af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer struct mirror_set *ms = ti->private; 1368af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer int ret = 0; 1369af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer unsigned i; 1370af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer 1371af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer for (i = 0; !ret && i < ms->nr_mirrors; i++) 1372af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer ret = fn(ti, ms->mirror[i].dev, 13735dea271b6d87bd1d79a59c1d5baac2596a841c37Mike Snitzer ms->mirror[i].offset, ti->len, data); 1374af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer 1375af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer return ret; 1376af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer} 1377af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer 13781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct target_type mirror_target = { 13791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .name = "mirror", 1380af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer .version = {1, 12, 0}, 13811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .module = THIS_MODULE, 13821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .ctr = mirror_ctr, 13831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .dtr = mirror_dtr, 13841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .map = mirror_map, 13851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .end_io = mirror_end_io, 1386b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow .presuspend = mirror_presuspend, 13871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .postsuspend = mirror_postsuspend, 13881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .resume = mirror_resume, 13891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .status = mirror_status, 1390af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer .iterate_devices = mirror_iterate_devices, 13911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 13921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init dm_mirror_init(void) 13941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 13951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int r; 13961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 139795f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka _dm_raid1_read_record_cache = KMEM_CACHE(dm_raid1_read_record, 0); 139895f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka if (!_dm_raid1_read_record_cache) { 139995f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka DMERR("Can't allocate dm_raid1_read_record cache"); 140095f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka r = -ENOMEM; 140195f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka goto bad_cache; 140295f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka } 140395f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka 14041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds r = dm_register_target(&mirror_target); 140595f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka if (r < 0) { 14060cd3312434cd1f29bee6bff53bf2790d733ad2a2Alasdair G Kergon DMERR("Failed to register mirror target"); 140795f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka goto bad_target; 140895f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka } 140995f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka 141095f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka return 0; 14111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 141295f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patockabad_target: 141395f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka kmem_cache_destroy(_dm_raid1_read_record_cache); 141495f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patockabad_cache: 14151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return r; 14161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 14171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit dm_mirror_exit(void) 14191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 142010d3bd09a3c25df114f74f7f86e1b58d070bef32Mikulas Patocka dm_unregister_target(&mirror_target); 142195f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka kmem_cache_destroy(_dm_raid1_read_record_cache); 14221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 14231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Module hooks */ 14251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_init(dm_mirror_init); 14261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(dm_mirror_exit); 14271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_DESCRIPTION(DM_NAME " mirror target"); 14291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Joe Thornber"); 14301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 1431