dm-raid1.c revision 5339fc2d47d1d720e027b9b832bf5aae8fba2ac0
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; 72929be8fcb4b4b65d038e73d3bb34715851a95ca2Mikulas Patocka int leg_failure; 73b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow atomic_t suspend; 74e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown 7572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow atomic_t default_mirror; /* Default mirror */ 76e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown 776ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski struct workqueue_struct *kmirrord_wq; 786ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski struct work_struct kmirrord_work; 79a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka struct timer_list timer; 80a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka unsigned long timer_pending; 81a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka 8272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct work_struct trigger_event; 836ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski 841f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen unsigned nr_mirrors; 85e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown struct mirror mirror[0]; 86e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown}; 87e4c8b3ba34cc1aeab451c7a5cc843c5fd62cbe3dNeil Brown 881f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic void wakeup_mirrord(void *context) 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 901f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct mirror_set *ms = context; 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 926ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski queue_work(ms->kmirrord_wq, &ms->kmirrord_work); 936ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski} 946ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski 95a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patockastatic void delayed_wake_fn(unsigned long data) 96a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka{ 97a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka struct mirror_set *ms = (struct mirror_set *) data; 98a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka 99a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka clear_bit(0, &ms->timer_pending); 1001f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_mirrord(ms); 101a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka} 102a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka 103a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patockastatic void delayed_wake(struct mirror_set *ms) 104a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka{ 105a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka if (test_and_set_bit(0, &ms->timer_pending)) 106a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka return; 107a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka 108a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka ms->timer.expires = jiffies + HZ / 5; 109a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka ms->timer.data = (unsigned long) ms; 110a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka ms->timer.function = delayed_wake_fn; 111a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka add_timer(&ms->timer); 112a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka} 113a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka 1141f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic void wakeup_all_recovery_waiters(void *context) 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1161f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wake_up_all(&_kmirrord_recovery_stopped); 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1191f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic void queue_bio(struct mirror_set *ms, struct bio *bio, int rw) 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long flags; 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int should_wake = 0; 1231f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct bio_list *bl; 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1251f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen bl = (rw == WRITE) ? &ms->writes : &ms->reads; 1261f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen spin_lock_irqsave(&ms->lock, flags); 1271f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen should_wake = !(bl->head); 1281f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen bio_list_add(bl, bio); 1291f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen spin_unlock_irqrestore(&ms->lock, flags); 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (should_wake) 1321f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_mirrord(ms); 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1351f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic void dispatch_bios(void *context, struct bio_list *bio_list) 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1371f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct mirror_set *ms = context; 1381f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct bio *bio; 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1401f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen while ((bio = bio_list_pop(bio_list))) 1411f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen queue_bio(ms, bio, WRITE); 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow#define MIN_READ_RECORDS 20 14506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstruct dm_raid1_read_record { 14606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct mirror *m; 14706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct dm_bio_details details; 14806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow}; 14906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 15095f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patockastatic struct kmem_cache *_dm_raid1_read_record_cache; 15195f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Every mirror should look like this one. 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define DEFAULT_MIRROR 0 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 15806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * This is yucky. We squirrel the mirror struct away inside 15906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * bi_next for read/write buffers. This is safe since the bh 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * doesn't get submitted to the lower levels of block layer. 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 16206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic struct mirror *bio_get_m(struct bio *bio) 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 16406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return (struct mirror *) bio->bi_next; 1651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 16706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic void bio_set_m(struct bio *bio, struct mirror *m) 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 16906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio->bi_next = (struct bio *) m; 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 17272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowstatic struct mirror *get_default_mirror(struct mirror_set *ms) 17372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow{ 17472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow return &ms->mirror[atomic_read(&ms->default_mirror)]; 17572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow} 17672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 17772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowstatic void set_default_mirror(struct mirror *m) 17872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow{ 17972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct mirror_set *ms = m->ms; 18072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct mirror *m0 = &(ms->mirror[0]); 18172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 18272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow atomic_set(&ms->default_mirror, m - m0); 18372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow} 18472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 18587968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patockastatic struct mirror *get_valid_mirror(struct mirror_set *ms) 18687968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka{ 18787968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka struct mirror *m; 18887968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka 18987968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka for (m = ms->mirror; m < ms->mirror + ms->nr_mirrors; m++) 19087968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka if (!atomic_read(&m->error_count)) 19187968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka return m; 19287968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka 19387968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka return NULL; 19487968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka} 19587968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka 19672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow/* fail_mirror 19772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * @m: mirror device to fail 19872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * @error_type: one of the enum's, DM_RAID1_*_ERROR 19972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * 20072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * If errors are being handled, record the type of 20172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * error encountered for this device. If this type 20272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * of error has already been recorded, we can return; 20372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * otherwise, we must signal userspace by triggering 20472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * an event. Additionally, if the device is the 20572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * primary device, we must choose a new primary, but 20672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * only if the mirror is in-sync. 20772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * 20872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * This function must not block. 20972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow */ 21072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowstatic void fail_mirror(struct mirror *m, enum dm_raid1_error error_type) 21172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow{ 21272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct mirror_set *ms = m->ms; 21372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct mirror *new; 21472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 215929be8fcb4b4b65d038e73d3bb34715851a95ca2Mikulas Patocka ms->leg_failure = 1; 216929be8fcb4b4b65d038e73d3bb34715851a95ca2Mikulas Patocka 21772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow /* 21872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * error_count is used for nothing more than a 21972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * simple way to tell if a device has encountered 22072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * errors. 22172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow */ 22272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow atomic_inc(&m->error_count); 22372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 22472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (test_and_set_bit(error_type, &m->error_type)) 22572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow return; 22672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 227d460c65a6a9ec9e0d284864ec3a9a2d1b73f0e43Jonathan Brassow if (!errors_handled(ms)) 228d460c65a6a9ec9e0d284864ec3a9a2d1b73f0e43Jonathan Brassow return; 229d460c65a6a9ec9e0d284864ec3a9a2d1b73f0e43Jonathan Brassow 23072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (m != get_default_mirror(ms)) 23172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow goto out; 23272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 23372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (!ms->in_sync) { 23472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow /* 23572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * Better to issue requests to same failing device 23672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow * than to risk returning corrupt data. 23772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow */ 23872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow DMERR("Primary mirror (%s) failed while out-of-sync: " 23972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow "Reads may fail.", m->dev->name); 24072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow goto out; 24172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow } 24272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 24387968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka new = get_valid_mirror(ms); 24487968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka if (new) 24587968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka set_default_mirror(new); 24687968ddd2f3be1c21b932cac30157a83a1c4f935Mikulas Patocka else 24772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow DMWARN("All sides of mirror have failed."); 24872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 24972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowout: 25072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow schedule_work(&ms->trigger_event); 25172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow} 25272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 253c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patockastatic int mirror_flush(struct dm_target *ti) 254c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka{ 255c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka struct mirror_set *ms = ti->private; 256c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka unsigned long error_bits; 257c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka 258c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka unsigned int i; 259c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka struct dm_io_region io[ms->nr_mirrors]; 260c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka struct mirror *m; 261c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka struct dm_io_request io_req = { 262c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka .bi_rw = WRITE_BARRIER, 263c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka .mem.type = DM_IO_KMEM, 264c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka .mem.ptr.bvec = NULL, 265c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka .client = ms->io_client, 266c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka }; 267c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka 268c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) { 269c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka io[i].bdev = m->dev->bdev; 270c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka io[i].sector = 0; 271c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka io[i].count = 0; 272c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka } 273c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka 274c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka error_bits = -1; 275c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka dm_io(&io_req, ms->nr_mirrors, io, &error_bits); 276c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka if (unlikely(error_bits != 0)) { 277c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka for (i = 0; i < ms->nr_mirrors; i++) 278c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka if (test_bit(i, &error_bits)) 279c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka fail_mirror(ms->mirror + i, 28064b30c46e866bbff8a9e17883a18636adc358455Mikulas Patocka DM_RAID1_FLUSH_ERROR); 281c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka return -EIO; 282c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka } 283c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka 284c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka return 0; 285c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka} 286c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Recovery. 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * When a mirror is first activated we may find that some regions 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * are in the no-sync state. We have to recover these by 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * recopying from the default mirror to all the others. 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *---------------------------------------------------------------*/ 2944cdc1d1fa5c5ac14dc21be19832f02fd0b83867eAlasdair G Kergonstatic void recovery_complete(int read_err, unsigned long write_err, 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds void *context) 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 2971f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_region *reg = context; 2981f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct mirror_set *ms = dm_rh_region_context(reg); 2998f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow int m, bit = 0; 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3018f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow if (read_err) { 302f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow /* Read error means the failure of default mirror. */ 303f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow DMERR_LIMIT("Unable to read primary mirror during recovery"); 3048f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow fail_mirror(get_default_mirror(ms), DM_RAID1_SYNC_ERROR); 3058f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow } 306f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow 3078f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow if (write_err) { 3084cdc1d1fa5c5ac14dc21be19832f02fd0b83867eAlasdair G Kergon DMERR_LIMIT("Write error during recovery (error = 0x%lx)", 309f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow write_err); 3108f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow /* 3118f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow * Bits correspond to devices (excluding default mirror). 3128f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow * The default mirror cannot change during recovery. 3138f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow */ 3148f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow for (m = 0; m < ms->nr_mirrors; m++) { 3158f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow if (&ms->mirror[m] == get_default_mirror(ms)) 3168f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow continue; 3178f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow if (test_bit(bit, &write_err)) 3188f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow fail_mirror(ms->mirror + m, 3198f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow DM_RAID1_SYNC_ERROR); 3208f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow bit++; 3218f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow } 3228f0205b798f926e2745de5fdebf0a8605c621de6Jonathan Brassow } 323f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow 3241f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_recovery_end(reg, !(read_err || write_err)); 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3271f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic int recover(struct mirror_set *ms, struct dm_region *reg) 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int r; 3301f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen unsigned i; 331eb69aca5d3370b81450d68edeebc2bb9a3eb9689Heinz Mauelshagen struct dm_io_region from, to[DM_KCOPYD_MAX_REGIONS], *dest; 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror *m; 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long flags = 0; 3341f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen region_t key = dm_rh_get_region_key(reg); 3351f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen sector_t region_size = dm_rh_get_region_size(ms->rh); 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* fill in the source */ 33872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow m = get_default_mirror(ms); 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds from.bdev = m->dev->bdev; 3401f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen from.sector = m->offset + dm_rh_region_to_sector(ms->rh, key); 3411f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen if (key == (ms->nr_regions - 1)) { 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The final region may be smaller than 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * region_size. 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3461f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen from.count = ms->ti->len & (region_size - 1); 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!from.count) 3481f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen from.count = region_size; 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else 3501f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen from.count = region_size; 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* fill in the destinations */ 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0, dest = to; i < ms->nr_mirrors; i++) { 35472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (&ms->mirror[i] == get_default_mirror(ms)) 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds m = ms->mirror + i; 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dest->bdev = m->dev->bdev; 3591f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dest->sector = m->offset + dm_rh_region_to_sector(ms->rh, key); 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dest->count = from.count; 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dest++; 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* hand to kcopyd */ 365f7c83e2e4783c4f7abe6f3a85a8c5e210f98bc7bJonathan Brassow if (!errors_handled(ms)) 366f7c83e2e4783c4f7abe6f3a85a8c5e210f98bc7bJonathan Brassow set_bit(DM_KCOPYD_IGNORE_ERROR, &flags); 367f7c83e2e4783c4f7abe6f3a85a8c5e210f98bc7bJonathan Brassow 368eb69aca5d3370b81450d68edeebc2bb9a3eb9689Heinz Mauelshagen r = dm_kcopyd_copy(ms->kcopyd_client, &from, ms->nr_mirrors - 1, to, 369eb69aca5d3370b81450d68edeebc2bb9a3eb9689Heinz Mauelshagen flags, recovery_complete, reg); 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return r; 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void do_recovery(struct mirror_set *ms) 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3761f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_region *reg; 3771f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int r; 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Start quiescing some regions. 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3831f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_recovery_prepare(ms->rh); 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copy any already quiesced regions. 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3881f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen while ((reg = dm_rh_recovery_start(ms->rh))) { 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds r = recover(ms, reg); 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (r) 3911f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_recovery_end(reg, 0); 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Update the in sync flag. 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!ms->in_sync && 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (log->type->get_sync_count(log) == ms->nr_regions)) { 3991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* the sync is complete */ 4001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dm_table_event(ms->ti->table); 4011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->in_sync = 1; 4021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 4031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 4061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Reads 4071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *---------------------------------------------------------------*/ 4081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct mirror *choose_mirror(struct mirror_set *ms, sector_t sector) 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 41006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct mirror *m = get_default_mirror(ms); 41106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 41206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow do { 41306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (likely(!atomic_read(&m->error_count))) 41406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return m; 41506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 41606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (m-- == ms->mirror) 41706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m += ms->nr_mirrors; 41806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } while (m != get_default_mirror(ms)); 41906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 42006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return NULL; 42106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 42206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 42306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic int default_ok(struct mirror *m) 42406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 42506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct mirror *default_mirror = get_default_mirror(m->ms); 42606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 42706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return !atomic_read(&default_mirror->error_count); 42806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 42906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 43006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic int mirror_available(struct mirror_set *ms, struct bio *bio) 43106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 4321f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 4331f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen region_t region = dm_rh_bio_to_region(ms->rh, bio); 43406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 4351f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen if (log->type->in_sync(log, region, 0)) 43606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return choose_mirror(ms, bio->bi_sector) ? 1 : 0; 43706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 43806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return 0; 4391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * remap a buffer to a particular mirror. 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 44406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic sector_t map_sector(struct mirror *m, struct bio *bio) 44506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 4464184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka if (unlikely(!bio->bi_size)) 4474184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka return 0; 44806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return m->offset + (bio->bi_sector - m->ms->ti->begin); 44906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 45006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 45106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic void map_bio(struct mirror *m, struct bio *bio) 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio->bi_bdev = m->dev->bdev; 45406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio->bi_sector = map_sector(m, bio); 45506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 45606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 45722a1ceb1e6a7fbce95a1531ff10bb4fb036d4a37Heinz Mauelshagenstatic void map_region(struct dm_io_region *io, struct mirror *m, 45806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct bio *bio) 45906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 46006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow io->bdev = m->dev->bdev; 46106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow io->sector = map_sector(m, bio); 46206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow io->count = bio->bi_size >> 9; 46306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 46406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 46504788507686d184d8166918b70ef52311bc36dcbMikulas Patockastatic void hold_bio(struct mirror_set *ms, struct bio *bio) 46604788507686d184d8166918b70ef52311bc36dcbMikulas Patocka{ 46704788507686d184d8166918b70ef52311bc36dcbMikulas Patocka /* 46804788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * If device is suspended, complete the bio. 46904788507686d184d8166918b70ef52311bc36dcbMikulas Patocka */ 47004788507686d184d8166918b70ef52311bc36dcbMikulas Patocka if (atomic_read(&ms->suspend)) { 47104788507686d184d8166918b70ef52311bc36dcbMikulas Patocka if (dm_noflush_suspending(ms->ti)) 47204788507686d184d8166918b70ef52311bc36dcbMikulas Patocka bio_endio(bio, DM_ENDIO_REQUEUE); 47304788507686d184d8166918b70ef52311bc36dcbMikulas Patocka else 47404788507686d184d8166918b70ef52311bc36dcbMikulas Patocka bio_endio(bio, -EIO); 47504788507686d184d8166918b70ef52311bc36dcbMikulas Patocka return; 47604788507686d184d8166918b70ef52311bc36dcbMikulas Patocka } 47704788507686d184d8166918b70ef52311bc36dcbMikulas Patocka 47804788507686d184d8166918b70ef52311bc36dcbMikulas Patocka /* 47904788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * Hold bio until the suspend is complete. 48004788507686d184d8166918b70ef52311bc36dcbMikulas Patocka */ 48104788507686d184d8166918b70ef52311bc36dcbMikulas Patocka spin_lock_irq(&ms->lock); 48204788507686d184d8166918b70ef52311bc36dcbMikulas Patocka bio_list_add(&ms->holds, bio); 48304788507686d184d8166918b70ef52311bc36dcbMikulas Patocka spin_unlock_irq(&ms->lock); 48404788507686d184d8166918b70ef52311bc36dcbMikulas Patocka} 48504788507686d184d8166918b70ef52311bc36dcbMikulas Patocka 48606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow/*----------------------------------------------------------------- 48706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * Reads 48806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow *---------------------------------------------------------------*/ 48906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic void read_callback(unsigned long error, void *context) 49006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 49106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct bio *bio = context; 49206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct mirror *m; 49306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 49406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m = bio_get_m(bio); 49506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_set_m(bio, NULL); 49606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 49706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (likely(!error)) { 49806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_endio(bio, 0); 49906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return; 50006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 50106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 50206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow fail_mirror(m, DM_RAID1_READ_ERROR); 50306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 50406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (likely(default_ok(m)) || mirror_available(m->ms, bio)) { 50506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow DMWARN_LIMIT("Read failure on mirror device %s. " 50606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow "Trying alternative device.", 50706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m->dev->name); 50806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow queue_bio(m->ms, bio, bio_rw(bio)); 50906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return; 51006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 51106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 51206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow DMERR_LIMIT("Read failure on mirror device %s. Failing I/O.", 51306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m->dev->name); 51406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_endio(bio, -EIO); 51506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow} 51606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 51706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow/* Asynchronous read. */ 51806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowstatic void read_async_bio(struct mirror *m, struct bio *bio) 51906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow{ 52022a1ceb1e6a7fbce95a1531ff10bb4fb036d4a37Heinz Mauelshagen struct dm_io_region io; 52106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct dm_io_request io_req = { 52206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .bi_rw = READ, 52306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .mem.type = DM_IO_BVEC, 52406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .mem.ptr.bvec = bio->bi_io_vec + bio->bi_idx, 52506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .notify.fn = read_callback, 52606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .notify.context = bio, 52706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow .client = m->ms->io_client, 52806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow }; 52906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 53006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_region(&io, m, bio); 53106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_set_m(bio, m); 5321f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen BUG_ON(dm_io(&io_req, 1, &io, NULL)); 5331f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen} 5341f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen 5351f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagenstatic inline int region_in_sync(struct mirror_set *ms, region_t region, 5361f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen int may_block) 5371f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen{ 5381f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen int state = dm_rh_get_state(ms->rh, region, may_block); 5391f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen return state == DM_RH_CLEAN || state == DM_RH_DIRTY; 5401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void do_reads(struct mirror_set *ms, struct bio_list *reads) 5431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 5441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds region_t region; 5451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct bio *bio; 5461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror *m; 5471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while ((bio = bio_list_pop(reads))) { 5491f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen region = dm_rh_bio_to_region(ms->rh, bio); 55006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m = get_default_mirror(ms); 5511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 5531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We can only read balance if the region is in sync. 5541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 5551f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen if (likely(region_in_sync(ms, region, 1))) 5561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds m = choose_mirror(ms, bio->bi_sector); 55706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow else if (m && atomic_read(&m->error_count)) 55806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m = NULL; 5591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 56006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (likely(m)) 56106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow read_async_bio(m, bio); 56206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow else 56306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_endio(bio, -EIO); 5641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 5651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 5661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 5681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Writes. 5691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We do different things with the write io depending on the 5711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * state of the region that it's in: 5721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 5731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * SYNC: increment pending, use kcopyd to write to *all* mirrors 5741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * RECOVERING: delay the io until recovery completes 5751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * NOSYNC: increment pending, just write to the default mirror 5761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *---------------------------------------------------------------*/ 57772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 57872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 5791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void write_callback(unsigned long error, void *context) 5801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 58172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow unsigned i, ret = 0; 5821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct bio *bio = (struct bio *) context; 5831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms; 58472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow int should_wake = 0; 58572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow unsigned long flags; 5861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 58706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow ms = bio_get_m(bio)->ms; 58806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_set_m(bio, NULL); 5891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 5901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 5911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * NOTE: We don't decrement the pending count here, 5921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * instead it is done by the targets endio function. 5931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This way we handle both writes to SYNC and NOSYNC 5941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * regions with the same code. 5951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 59660f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka if (likely(!error)) { 59760f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka bio_endio(bio, ret); 59860f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka return; 59960f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka } 6001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 60172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow for (i = 0; i < ms->nr_mirrors; i++) 60272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow if (test_bit(i, &error)) 60372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow fail_mirror(ms->mirror + i, DM_RAID1_WRITE_ERROR); 60472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 60560f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka /* 60660f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka * Need to raise event. Since raising 60760f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka * events can block, we need to do it in 60860f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka * the main thread. 60960f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka */ 61060f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka spin_lock_irqsave(&ms->lock, flags); 61160f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka if (!ms->failures.head) 61260f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka should_wake = 1; 61360f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka bio_list_add(&ms->failures, bio); 61460f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka spin_unlock_irqrestore(&ms->lock, flags); 61560f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka if (should_wake) 61660f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka wakeup_mirrord(ms); 6171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void do_write(struct mirror_set *ms, struct bio *bio) 6201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int i; 62222a1ceb1e6a7fbce95a1531ff10bb4fb036d4a37Heinz Mauelshagen struct dm_io_region io[ms->nr_mirrors], *dest = io; 6231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror *m; 62488be163abb5324bab09f5eff9646590eec5314ebMilan Broz struct dm_io_request io_req = { 6254184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka .bi_rw = WRITE | (bio->bi_rw & WRITE_BARRIER), 62688be163abb5324bab09f5eff9646590eec5314ebMilan Broz .mem.type = DM_IO_BVEC, 62788be163abb5324bab09f5eff9646590eec5314ebMilan Broz .mem.ptr.bvec = bio->bi_io_vec + bio->bi_idx, 62888be163abb5324bab09f5eff9646590eec5314ebMilan Broz .notify.fn = write_callback, 62988be163abb5324bab09f5eff9646590eec5314ebMilan Broz .notify.context = bio, 63088be163abb5324bab09f5eff9646590eec5314ebMilan Broz .client = ms->io_client, 63188be163abb5324bab09f5eff9646590eec5314ebMilan Broz }; 6321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 63306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow for (i = 0, m = ms->mirror; i < ms->nr_mirrors; i++, m++) 63406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_region(dest++, m, bio); 6351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 63606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow /* 63706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * Use default mirror because we only need it to retrieve the reference 63806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * to the mirror set in write_callback(). 63906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow */ 64006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bio_set_m(bio, get_default_mirror(ms)); 64188be163abb5324bab09f5eff9646590eec5314ebMilan Broz 6421f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen BUG_ON(dm_io(&io_req, ms->nr_mirrors, io, NULL)); 6431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 6441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void do_writes(struct mirror_set *ms, struct bio_list *writes) 6461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 6471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int state; 6481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct bio *bio; 6491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct bio_list sync, nosync, recover, *this_list = NULL; 6507513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow struct bio_list requeue; 6517513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 6527513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow region_t region; 6531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!writes->head) 6551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return; 6561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 6581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Classify each write. 6591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 6601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_init(&sync); 6611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_init(&nosync); 6621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_init(&recover); 6637513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow bio_list_init(&requeue); 6641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while ((bio = bio_list_pop(writes))) { 6664184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka if (unlikely(bio_empty_barrier(bio))) { 6674184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka bio_list_add(&sync, bio); 6684184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka continue; 6694184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka } 6704184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka 6717513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow region = dm_rh_bio_to_region(ms->rh, bio); 6727513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow 6737513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow if (log->type->is_remote_recovering && 6747513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow log->type->is_remote_recovering(log, region)) { 6757513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow bio_list_add(&requeue, bio); 6767513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow continue; 6777513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow } 6787513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow 6797513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow state = dm_rh_get_state(ms->rh, region, 1); 6801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (state) { 6811f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen case DM_RH_CLEAN: 6821f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen case DM_RH_DIRTY: 6831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this_list = &sync; 6841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 6851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6861f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen case DM_RH_NOSYNC: 6871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this_list = &nosync; 6881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 6891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6901f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen case DM_RH_RECOVERING: 6911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this_list = &recover; 6921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 6931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_add(this_list, bio); 6961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 6971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 6981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 6997513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow * Add bios that are delayed due to remote recovery 7007513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow * back on to the write queue 7017513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow */ 7027513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow if (unlikely(requeue.head)) { 7037513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow spin_lock_irq(&ms->lock); 7047513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow bio_list_merge(&ms->writes, &requeue); 7057513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow spin_unlock_irq(&ms->lock); 70669885683d22d8c05910fd808c01fdce1322739b4Mikulas Patocka delayed_wake(ms); 7077513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow } 7087513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow 7097513c2a761d69d2a93f17146b3563527d3618ba0Jonathan Brassow /* 7101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Increment the pending counts for any regions that will 7111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * be written to (writes to recover regions are going to 7121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * be delayed). 7131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 7141f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_inc_pending(ms->rh, &sync); 7151f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_inc_pending(ms->rh, &nosync); 716d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow 717d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow /* 718d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow * If the flush fails on a previous call and succeeds here, 719d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow * we must not reset the log_failure variable. We need 720d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow * userspace interaction to do that. 721d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow */ 722d2b698644c97cb033261536a4f2010924a00eac9Jonathan Brassow ms->log_failure = dm_rh_flush(ms->rh) ? 1 : ms->log_failure; 7231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 7251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Dispatch io. 7261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 727b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow if (unlikely(ms->log_failure)) { 728b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow spin_lock_irq(&ms->lock); 729b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow bio_list_merge(&ms->failures, &sync); 730b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow spin_unlock_irq(&ms->lock); 7311f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_mirrord(ms); 732b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow } else 733fc1ff9588a6d56258ff9576a31aa34f17757c666Jonathan Brassow while ((bio = bio_list_pop(&sync))) 734b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow do_write(ms, bio); 7351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while ((bio = bio_list_pop(&recover))) 7371f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_delay(ms->rh, bio); 7381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 7391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while ((bio = bio_list_pop(&nosync))) { 740929be8fcb4b4b65d038e73d3bb34715851a95ca2Mikulas Patocka if (unlikely(ms->leg_failure) && errors_handled(ms)) 741929be8fcb4b4b65d038e73d3bb34715851a95ca2Mikulas Patocka hold_bio(ms, bio); 742929be8fcb4b4b65d038e73d3bb34715851a95ca2Mikulas Patocka else { 743929be8fcb4b4b65d038e73d3bb34715851a95ca2Mikulas Patocka map_bio(get_default_mirror(ms), bio); 744929be8fcb4b4b65d038e73d3bb34715851a95ca2Mikulas Patocka generic_make_request(bio); 745929be8fcb4b4b65d038e73d3bb34715851a95ca2Mikulas Patocka } 7461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 7471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 7481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 74972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowstatic void do_failures(struct mirror_set *ms, struct bio_list *failures) 75072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow{ 75172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct bio *bio; 75272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 7530f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka if (likely(!failures->head)) 75472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow return; 75572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 756b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow /* 757b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * If the log has failed, unattempted writes are being 7580f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka * put on the holds list. We can't issue those writes 759b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * until a log has been marked, so we must store them. 760b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * 761b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * If a 'noflush' suspend is in progress, we can requeue 762b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * the I/O's to the core. This give userspace a chance 763b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * to reconfigure the mirror, at which point the core 764b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * will reissue the writes. If the 'noflush' flag is 765b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * not set, we have no choice but to return errors. 766b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * 767b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * Some writes on the failures list may have been 768b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * submitted before the log failure and represent a 769b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * failure to write to one of the devices. It is ok 770b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * for us to treat them the same and requeue them 771b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * as well. 772b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow */ 7730f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka while ((bio = bio_list_pop(failures))) { 77460f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka if (!ms->log_failure) { 7750f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka ms->in_sync = 0; 776c58098be979509a54021e837a47fcad08db31f94Mikulas Patocka dm_rh_mark_nosync(ms->rh, bio); 7770f398a8403e31c737b429fddc3850093d0bf58d0Mikulas Patocka } 77860f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka 77960f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka /* 78060f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka * If all the legs are dead, fail the I/O. 78160f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka * If we have been told to handle errors, hold the bio 78260f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka * and wait for userspace to deal with the problem. 78360f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka * Otherwise pretend that the I/O succeeded. (This would 78460f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka * be wrong if the failed leg returned after reboot and 78560f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka * got replicated back to the good legs.) 78660f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka */ 78760f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka if (!get_valid_mirror(ms)) 78860f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka bio_endio(bio, -EIO); 78960f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka else if (errors_handled(ms)) 79060f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka hold_bio(ms, bio); 79160f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka else 79260f355ead31e2be8d06ac8acb163df91a1c64e3bMikulas Patocka bio_endio(bio, 0); 793b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow } 79472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow} 79572f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 79672f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassowstatic void trigger_event(struct work_struct *work) 79772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow{ 79872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct mirror_set *ms = 79972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow container_of(work, struct mirror_set, trigger_event); 80072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 80172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow dm_table_event(ms->ti->table); 80272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow} 80372f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow 8041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 8051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * kmirrord 8061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *---------------------------------------------------------------*/ 807a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patockastatic void do_mirror(struct work_struct *work) 8081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8091f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct mirror_set *ms = container_of(work, struct mirror_set, 8101f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen kmirrord_work); 81172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow struct bio_list reads, writes, failures; 81272f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow unsigned long flags; 8131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 81472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow spin_lock_irqsave(&ms->lock, flags); 8151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds reads = ms->reads; 8161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writes = ms->writes; 81772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow failures = ms->failures; 8181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_init(&ms->reads); 8191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bio_list_init(&ms->writes); 82072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow bio_list_init(&ms->failures); 82172f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow spin_unlock_irqrestore(&ms->lock, flags); 8221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8231f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_update_states(ms->rh, errors_handled(ms)); 8241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do_recovery(ms); 8251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do_reads(ms, &reads); 8261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do_writes(ms, &writes); 82772f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow do_failures(ms, &failures); 8287ff14a36159d947872870e7a3e9dcaebc46b23ebMikulas Patocka 8297ff14a36159d947872870e7a3e9dcaebc46b23ebMikulas Patocka dm_table_unplug_all(ms->ti->table); 8301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/*----------------------------------------------------------------- 8331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Target functions 8341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *---------------------------------------------------------------*/ 8351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct mirror_set *alloc_context(unsigned int nr_mirrors, 8361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds uint32_t region_size, 8371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct dm_target *ti, 838416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen struct dm_dirty_log *dl) 8391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 8401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds size_t len; 8411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = NULL; 8421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds len = sizeof(*ms) + (sizeof(ms->mirror[0]) * nr_mirrors); 8441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 845dd00cc486ab1c17049a535413d1751ef3482141cYoann Padioleau ms = kzalloc(len, GFP_KERNEL); 8461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!ms) { 84772d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Cannot allocate mirror context"; 8481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 8491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_init(&ms->lock); 8525339fc2d47d1d720e027b9b832bf5aae8fba2ac0Mikulas Patocka bio_list_init(&ms->reads); 8535339fc2d47d1d720e027b9b832bf5aae8fba2ac0Mikulas Patocka bio_list_init(&ms->writes); 8545339fc2d47d1d720e027b9b832bf5aae8fba2ac0Mikulas Patocka bio_list_init(&ms->failures); 8555339fc2d47d1d720e027b9b832bf5aae8fba2ac0Mikulas Patocka bio_list_init(&ms->holds); 8561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->ti = ti; 8581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->nr_mirrors = nr_mirrors; 8591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->nr_regions = dm_sector_div_up(ti->len, region_size); 8601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->in_sync = 0; 861b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow ms->log_failure = 0; 862929be8fcb4b4b65d038e73d3bb34715851a95ca2Mikulas Patocka ms->leg_failure = 0; 863b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow atomic_set(&ms->suspend, 0); 86472f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow atomic_set(&ms->default_mirror, DEFAULT_MIRROR); 8651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 86695f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka ms->read_record_pool = mempool_create_slab_pool(MIN_READ_RECORDS, 86795f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka _dm_raid1_read_record_cache); 86895f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka 86906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (!ms->read_record_pool) { 87006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow ti->error = "Error creating mirror read_record_pool"; 87106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow kfree(ms); 87206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return NULL; 87306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 87406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 87588be163abb5324bab09f5eff9646590eec5314ebMilan Broz ms->io_client = dm_io_client_create(DM_IO_PAGES); 87688be163abb5324bab09f5eff9646590eec5314ebMilan Broz if (IS_ERR(ms->io_client)) { 87788be163abb5324bab09f5eff9646590eec5314ebMilan Broz ti->error = "Error creating dm_io client"; 87806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_destroy(ms->read_record_pool); 87988be163abb5324bab09f5eff9646590eec5314ebMilan Broz kfree(ms); 88088be163abb5324bab09f5eff9646590eec5314ebMilan Broz return NULL; 88188be163abb5324bab09f5eff9646590eec5314ebMilan Broz } 88288be163abb5324bab09f5eff9646590eec5314ebMilan Broz 8831f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen ms->rh = dm_region_hash_create(ms, dispatch_bios, wakeup_mirrord, 8841f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_all_recovery_waiters, 8851f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen ms->ti->begin, MAX_RECOVERY, 8861f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dl, region_size, ms->nr_regions); 8871f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen if (IS_ERR(ms->rh)) { 88872d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Error creating dirty region hash"; 889a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov dm_io_client_destroy(ms->io_client); 89006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_destroy(ms->read_record_pool); 8911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(ms); 8921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 8931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 8941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return ms; 8961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 8971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void free_context(struct mirror_set *ms, struct dm_target *ti, 8991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int m) 9001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds while (m--) 9021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dm_put_device(ti, ms->mirror[m].dev); 9031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 90488be163abb5324bab09f5eff9646590eec5314ebMilan Broz dm_io_client_destroy(ms->io_client); 9051f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_region_hash_destroy(ms->rh); 90606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_destroy(ms->read_record_pool); 9071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kfree(ms); 9081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int get_mirror(struct mirror_set *ms, struct dm_target *ti, 9111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int mirror, char **argv) 9121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9134ee218cd67b385759993a6c840ea45f0ee0a8b30Andrew Morton unsigned long long offset; 9141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9154ee218cd67b385759993a6c840ea45f0ee0a8b30Andrew Morton if (sscanf(argv[1], "%llu", &offset) != 1) { 91672d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Invalid offset"; 9171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 9181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (dm_get_device(ti, argv[0], offset, ti->len, 9211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dm_table_get_mode(ti->table), 9221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds &ms->mirror[mirror].dev)) { 92372d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Device lookup failure"; 9241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENXIO; 9251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 927aa5617c55357d86c9082ba1d66fa9795370c9954Jonathan Brassow ms->mirror[mirror].ms = ms; 92872f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow atomic_set(&(ms->mirror[mirror].error_count), 0); 92972f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow ms->mirror[mirror].error_type = 0; 9301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms->mirror[mirror].offset = offset; 9311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 9331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 9361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Create dirty log: log_type #log_params <log_params> 9371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 938416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagenstatic struct dm_dirty_log *create_dirty_log(struct dm_target *ti, 9391f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen unsigned argc, char **argv, 9401f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen unsigned *args_used) 9411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 9421f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen unsigned param_count; 943416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen struct dm_dirty_log *dl; 9441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (argc < 2) { 94672d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Insufficient mirror log arguments"; 9471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 9481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (sscanf(argv[1], "%u", ¶m_count) != 1) { 95172d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Invalid mirror log argument count"; 9521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 9531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *args_used = 2 + param_count; 9561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (argc < *args_used) { 95872d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Insufficient mirror log arguments"; 9591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 9601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 962c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka dl = dm_dirty_log_create(argv[0], ti, mirror_flush, param_count, 963c0da3748b9a894b9f9b561ecc2d090a913988a0fMikulas Patocka argv + 2); 9641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!dl) { 96572d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Error creating mirror dirty log"; 9661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return NULL; 9671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 9681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 9691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return dl; 9701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 9711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 972a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassowstatic int parse_features(struct mirror_set *ms, unsigned argc, char **argv, 973a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow unsigned *args_used) 974a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow{ 975a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow unsigned num_features; 976a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow struct dm_target *ti = ms->ti; 977a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 978a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow *args_used = 0; 979a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 980a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (!argc) 981a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow return 0; 982a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 983a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (sscanf(argv[0], "%u", &num_features) != 1) { 984a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ti->error = "Invalid number of features"; 985a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow return -EINVAL; 986a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow } 987a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 988a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow argc--; 989a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow argv++; 990a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow (*args_used)++; 991a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 992a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (num_features > argc) { 993a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ti->error = "Not enough arguments to support feature count"; 994a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow return -EINVAL; 995a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow } 996a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 997a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (!strcmp("handle_errors", argv[0])) 998a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ms->features |= DM_RAID1_HANDLE_ERRORS; 999a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow else { 1000a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ti->error = "Unrecognised feature requested"; 1001a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow return -EINVAL; 1002a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow } 1003a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 1004a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow (*args_used)++; 1005a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 1006a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow return 0; 1007a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow} 1008a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 10091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 10101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Construct a mirror mapping: 10111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 10121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * log_type #log_params <log_params> 10131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * #mirrors [mirror_path offset]{2,} 1014a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow * [#features <features>] 10151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 10161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * log_type is "core" or "disk" 10171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * #log_params is between 1 and 3 1018a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow * 1019a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow * If present, features must be "handle_errors". 10201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 10211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv) 10221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 10231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int r; 10241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int nr_mirrors, m, args_used; 10251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms; 1026416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen struct dm_dirty_log *dl; 10271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds dl = create_dirty_log(ti, argc, argv, &args_used); 10291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!dl) 10301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 10311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds argv += args_used; 10331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds argc -= args_used; 10341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!argc || sscanf(argv[0], "%u", &nr_mirrors) != 1 || 1036eb69aca5d3370b81450d68edeebc2bb9a3eb9689Heinz Mauelshagen nr_mirrors < 2 || nr_mirrors > DM_KCOPYD_MAX_REGIONS + 1) { 103772d9486169a2a8353e022813185ba2f32d7dde69Alasdair G Kergon ti->error = "Invalid number of mirrors"; 1038416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen dm_dirty_log_destroy(dl); 10391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 10401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds argv++, argc--; 10431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1044a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (argc < nr_mirrors * 2) { 1045a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ti->error = "Too few mirror arguments"; 1046416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen dm_dirty_log_destroy(dl); 10471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EINVAL; 10481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ms = alloc_context(nr_mirrors, dl->type->get_region_size(dl), ti, dl); 10511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!ms) { 1052416cd17b1982217bca3dc41b9f00b0b38fdaadadHeinz Mauelshagen dm_dirty_log_destroy(dl); 10531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOMEM; 10541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Get the mirror parameter sets */ 10571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (m = 0; m < nr_mirrors; m++) { 10581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds r = get_mirror(ms, ti, m, argv); 10591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (r) { 10601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds free_context(ms, ti, m); 10611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return r; 10621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds argv += 2; 10641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds argc -= 2; 10651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 10661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ti->private = ms; 10681f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen ti->split_io = dm_rh_get_region_size(ms->rh); 10694184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka ti->num_flush_requests = 1; 10701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 10716ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski ms->kmirrord_wq = create_singlethread_workqueue("kmirrord"); 10726ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski if (!ms->kmirrord_wq) { 10736ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski DMERR("couldn't start kmirrord"); 1074a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov r = -ENOMEM; 1075a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov goto err_free_context; 10766ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski } 10776ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski INIT_WORK(&ms->kmirrord_work, do_mirror); 1078a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka init_timer(&ms->timer); 1079a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka ms->timer_pending = 0; 108072f4b314100bae85c75d8e4c6fec621ab44e777dJonathan Brassow INIT_WORK(&ms->trigger_event, trigger_event); 10816ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski 1082a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow r = parse_features(ms, argc, argv, &args_used); 1083a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov if (r) 1084a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov goto err_destroy_wq; 1085a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 1086a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow argv += args_used; 1087a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow argc -= args_used; 1088a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 1089f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow /* 1090f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * Any read-balancing addition depends on the 1091f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * DM_RAID1_HANDLE_ERRORS flag being present. 1092f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * This is because the decision to balance depends 1093f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * on the sync state of a region. If the above 1094f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * flag is not present, we ignore errors; and 1095f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow * the sync state may be inaccurate. 1096f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow */ 1097f44db678edcc6f4c2779ac43f63f0b9dfa28b724Jonathan Brassow 1098a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (argc) { 1099a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow ti->error = "Too many mirror arguments"; 1100a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov r = -EINVAL; 1101a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov goto err_destroy_wq; 1102a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow } 1103a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 11041f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen r = dm_kcopyd_client_create(DM_KCOPYD_PAGES, &ms->kcopyd_client); 1105a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov if (r) 1106a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov goto err_destroy_wq; 11071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11081f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen wakeup_mirrord(ms); 11091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 1110a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov 1111a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhoverr_destroy_wq: 1112a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov destroy_workqueue(ms->kmirrord_wq); 1113a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhoverr_free_context: 1114a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov free_context(ms, ti, ms->nr_mirrors); 1115a72cf737e09da409e047863e38410930dae5fe05Dmitry Monakhov return r; 11161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void mirror_dtr(struct dm_target *ti) 11191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = (struct mirror_set *) ti->private; 11211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1122a2aebe03be60ae4da03507a00d60211d5e0327c3Mikulas Patocka del_timer_sync(&ms->timer); 11236ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski flush_workqueue(ms->kmirrord_wq); 112418776c7316545482a02bfaa2629a2aa1afc48357Mikulas Patocka flush_scheduled_work(); 1125eb69aca5d3370b81450d68edeebc2bb9a3eb9689Heinz Mauelshagen dm_kcopyd_client_destroy(ms->kcopyd_client); 11266ad36fe2b451cc85cc7b14f4128286759e217124Holger Smolinski destroy_workqueue(ms->kmirrord_wq); 11271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds free_context(ms, ti, ms->nr_mirrors); 11281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 11311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Mirror mapping function 11321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 11331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mirror_map(struct dm_target *ti, struct bio *bio, 11341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds union map_info *map_context) 11351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int r, rw = bio_rw(bio); 11371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror *m; 11381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = ti->private; 113906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct dm_raid1_read_record *read_record = NULL; 11401f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 11411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rw == WRITE) { 114306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow /* Save region for mirror_end_io() handler */ 11441f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen map_context->ll = dm_rh_bio_to_region(ms->rh, bio); 11451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds queue_bio(ms, bio, rw); 1146d2a7ad29a810441e9dacbaddcc2f0c6045390008Kiyoshi Ueda return DM_MAPIO_SUBMITTED; 11471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11491f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen r = log->type->in_sync(log, dm_rh_bio_to_region(ms->rh, bio), 0); 11501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (r < 0 && r != -EWOULDBLOCK) 11511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return r; 11521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 115406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * If region is not in-sync queue the bio. 11551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 115606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (!r || (r == -EWOULDBLOCK)) { 115706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (rw == READA) 115806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return -EWOULDBLOCK; 11591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds queue_bio(ms, bio, rw); 1161d2a7ad29a810441e9dacbaddcc2f0c6045390008Kiyoshi Ueda return DM_MAPIO_SUBMITTED; 11621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 11631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 116406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow /* 116506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * The region is in-sync and we can perform reads directly. 116606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * Store enough information so we can retry if it fails. 116706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow */ 11681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds m = choose_mirror(ms, bio->bi_sector); 116906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (unlikely(!m)) 11701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -EIO; 11711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 117206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow read_record = mempool_alloc(ms->read_record_pool, GFP_NOIO); 117306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (likely(read_record)) { 117406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow dm_bio_record(&read_record->details, bio); 117506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_context->ptr = read_record; 117606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow read_record->m = m; 117706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 117806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 117906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_bio(m, bio); 118006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 1181d2a7ad29a810441e9dacbaddcc2f0c6045390008Kiyoshi Ueda return DM_MAPIO_REMAPPED; 11821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 11831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mirror_end_io(struct dm_target *ti, struct bio *bio, 11851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int error, union map_info *map_context) 11861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 11871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int rw = bio_rw(bio); 11881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = (struct mirror_set *) ti->private; 118906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct mirror *m = NULL; 119006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct dm_bio_details *bd = NULL; 119106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow struct dm_raid1_read_record *read_record = map_context->ptr; 11921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 11931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* 11941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * We need to dec pending if this was a write. 11951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 119606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (rw == WRITE) { 11974184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka if (likely(!bio_empty_barrier(bio))) 11984184153f9e483f9bb63339ed316e059962fe9794Mikulas Patocka dm_rh_dec(ms->rh, map_context->ll); 119906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return error; 120006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 12011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 120206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (error == -EOPNOTSUPP) 120306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow goto out; 120406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 12051f98a13f623e0ef666690a18c1250335fc6d7ef1Jens Axboe if ((error == -EWOULDBLOCK) && bio_rw_flagged(bio, BIO_RW_AHEAD)) 120606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow goto out; 120706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 120806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (unlikely(error)) { 120906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (!read_record) { 121006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow /* 121106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * There wasn't enough memory to record necessary 121206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * information for a retry or there was no other 121306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * mirror in-sync. 121406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow */ 1215e03f1a842287480aa03732612148c0d333baca61Adrian Bunk DMERR_LIMIT("Mirror read failed."); 121606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return -EIO; 121706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 1218e03f1a842287480aa03732612148c0d333baca61Adrian Bunk 1219e03f1a842287480aa03732612148c0d333baca61Adrian Bunk m = read_record->m; 1220e03f1a842287480aa03732612148c0d333baca61Adrian Bunk 122106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow DMERR("Mirror read failed from %s. Trying alternative device.", 122206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow m->dev->name); 122306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 122406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow fail_mirror(m, DM_RAID1_READ_ERROR); 122506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 122606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow /* 122706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * A failed read is requeued for another attempt using an intact 122806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow * mirror. 122906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow */ 123006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (default_ok(m) || mirror_available(ms, bio)) { 123106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow bd = &read_record->details; 123206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 123306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow dm_bio_restore(bd, bio); 123406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_free(read_record, ms->read_record_pool); 123506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_context->ptr = NULL; 123606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow queue_bio(ms, bio, rw); 123706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return 1; 123806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 123906386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow DMERR("All replicated volumes dead, failing I/O"); 124006386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 124106386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 124206386bbfd2441416875d0403d405c56822f6ebacJonathan Brassowout: 124306386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow if (read_record) { 124406386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow mempool_free(read_record, ms->read_record_pool); 124506386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow map_context->ptr = NULL; 124606386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow } 124706386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow 124806386bbfd2441416875d0403d405c56822f6ebacJonathan Brassow return error; 12491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 12501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1251b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassowstatic void mirror_presuspend(struct dm_target *ti) 12521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 12531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = (struct mirror_set *) ti->private; 12541f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 12551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 125604788507686d184d8166918b70ef52311bc36dcbMikulas Patocka struct bio_list holds; 125704788507686d184d8166918b70ef52311bc36dcbMikulas Patocka struct bio *bio; 125804788507686d184d8166918b70ef52311bc36dcbMikulas Patocka 1259b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow atomic_set(&ms->suspend, 1); 1260b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 1261b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow /* 1262b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * We must finish up all the work that we've 1263b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * generated (i.e. recovery work). 1264b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow */ 12651f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_stop_recovery(ms->rh); 126633184048dc4f9d5550d3b6a88c8e0ff92033eb6eJonathan E Brassow 126733184048dc4f9d5550d3b6a88c8e0ff92033eb6eJonathan E Brassow wait_event(_kmirrord_recovery_stopped, 12681f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen !dm_rh_recovery_in_flight(ms->rh)); 126933184048dc4f9d5550d3b6a88c8e0ff92033eb6eJonathan E Brassow 1270b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow if (log->type->presuspend && log->type->presuspend(log)) 1271b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow /* FIXME: need better error handling */ 1272b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow DMWARN("log presuspend failed"); 1273b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 1274b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow /* 1275b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * Now that recovery is complete/stopped and the 1276b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * delayed bios are queued, we need to wait for 1277b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * the worker thread to complete. This way, 1278b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow * we know that all of our I/O has been pushed. 1279b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow */ 1280b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow flush_workqueue(ms->kmirrord_wq); 128104788507686d184d8166918b70ef52311bc36dcbMikulas Patocka 128204788507686d184d8166918b70ef52311bc36dcbMikulas Patocka /* 128304788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * Now set ms->suspend is set and the workqueue flushed, no more 128404788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * entries can be added to ms->hold list, so process it. 128504788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * 128604788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * Bios can still arrive concurrently with or after this 128704788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * presuspend function, but they cannot join the hold list 128804788507686d184d8166918b70ef52311bc36dcbMikulas Patocka * because ms->suspend is set. 128904788507686d184d8166918b70ef52311bc36dcbMikulas Patocka */ 129004788507686d184d8166918b70ef52311bc36dcbMikulas Patocka spin_lock_irq(&ms->lock); 129104788507686d184d8166918b70ef52311bc36dcbMikulas Patocka holds = ms->holds; 129204788507686d184d8166918b70ef52311bc36dcbMikulas Patocka bio_list_init(&ms->holds); 129304788507686d184d8166918b70ef52311bc36dcbMikulas Patocka spin_unlock_irq(&ms->lock); 129404788507686d184d8166918b70ef52311bc36dcbMikulas Patocka 129504788507686d184d8166918b70ef52311bc36dcbMikulas Patocka while ((bio = bio_list_pop(&holds))) 129604788507686d184d8166918b70ef52311bc36dcbMikulas Patocka hold_bio(ms, bio); 1297b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow} 1298b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 1299b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassowstatic void mirror_postsuspend(struct dm_target *ti) 1300b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow{ 1301b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow struct mirror_set *ms = ti->private; 13021f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 1303b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 13046b3df0d7a5e85ad2afd3eecc50e2dee59e876ae8Jonathan Brassow if (log->type->postsuspend && log->type->postsuspend(log)) 13051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* FIXME: need better error handling */ 1306b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow DMWARN("log postsuspend failed"); 13071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 13081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void mirror_resume(struct dm_target *ti) 13101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1311b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow struct mirror_set *ms = ti->private; 13121f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 1313b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow 1314b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow atomic_set(&ms->suspend, 0); 13151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (log->type->resume && log->type->resume(log)) 13161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* FIXME: need better error handling */ 13171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DMWARN("log resume failed"); 13181f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen dm_rh_start_recovery(ms->rh); 13191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 13201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1321af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow/* 1322af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * device_status_char 1323af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * @m: mirror device/leg we want the status of 1324af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * 1325af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * We return one character representing the most severe error 1326af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * we have encountered. 1327af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * A => Alive - No failures 1328af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * D => Dead - A write failure occurred leaving mirror out-of-sync 1329af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * S => Sync - A sychronization failure occurred, mirror out-of-sync 1330af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * R => Read - A read failure occurred, mirror data unaffected 1331af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * 1332af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow * Returns: <char> 1333af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow */ 1334af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassowstatic char device_status_char(struct mirror *m) 1335af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow{ 1336af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow if (!atomic_read(&(m->error_count))) 1337af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow return 'A'; 1338af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow 133964b30c46e866bbff8a9e17883a18636adc358455Mikulas Patocka return (test_bit(DM_RAID1_FLUSH_ERROR, &(m->error_type))) ? 'F' : 134064b30c46e866bbff8a9e17883a18636adc358455Mikulas Patocka (test_bit(DM_RAID1_WRITE_ERROR, &(m->error_type))) ? 'D' : 1341af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow (test_bit(DM_RAID1_SYNC_ERROR, &(m->error_type))) ? 'S' : 1342af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow (test_bit(DM_RAID1_READ_ERROR, &(m->error_type))) ? 'R' : 'U'; 1343af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow} 1344af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow 1345af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow 13461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int mirror_status(struct dm_target *ti, status_type_t type, 13471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *result, unsigned int maxlen) 13481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1349315dcc226f066c1d3cef79283dcde807fe0e32d1Jonathan E Brassow unsigned int m, sz = 0; 13501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mirror_set *ms = (struct mirror_set *) ti->private; 13511f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen struct dm_dirty_log *log = dm_rh_dirty_log(ms->rh); 1352af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow char buffer[ms->nr_mirrors + 1]; 13531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (type) { 13551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATUSTYPE_INFO: 13561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DMEMIT("%d ", ms->nr_mirrors); 1357af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow for (m = 0; m < ms->nr_mirrors; m++) { 13581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DMEMIT("%s ", ms->mirror[m].dev->name); 1359af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow buffer[m] = device_status_char(&(ms->mirror[m])); 1360af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow } 1361af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow buffer[m] = '\0'; 13621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1363af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow DMEMIT("%llu/%llu 1 %s ", 13641f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen (unsigned long long)log->type->get_sync_count(log), 1365af195ac82e38ba802fd86b5a014ed05ef6dd88bbJonathan Brassow (unsigned long long)ms->nr_regions, buffer); 1366315dcc226f066c1d3cef79283dcde807fe0e32d1Jonathan E Brassow 13671f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen sz += log->type->status(log, type, result+sz, maxlen-sz); 1368315dcc226f066c1d3cef79283dcde807fe0e32d1Jonathan E Brassow 13691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 13701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case STATUSTYPE_TABLE: 13721f965b19437017cea6d3f3f46acdc5acae5fd011Heinz Mauelshagen sz = log->type->status(log, type, result, maxlen); 1373315dcc226f066c1d3cef79283dcde807fe0e32d1Jonathan E Brassow 1374e52b8f6dbe18c879ad2b5013f991ec9e46813043Jonathan Brassow DMEMIT("%d", ms->nr_mirrors); 13751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (m = 0; m < ms->nr_mirrors; m++) 1376e52b8f6dbe18c879ad2b5013f991ec9e46813043Jonathan Brassow DMEMIT(" %s %llu", ms->mirror[m].dev->name, 1377b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow (unsigned long long)ms->mirror[m].offset); 1378a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow 1379a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow if (ms->features & DM_RAID1_HANDLE_ERRORS) 1380a8e6afa2363de7ee0dea1a3297f6236f421c2dd4Jonathan E Brassow DMEMIT(" 1 handle_errors"); 13811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 13821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 13831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 13841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 13851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1386af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzerstatic int mirror_iterate_devices(struct dm_target *ti, 1387af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer iterate_devices_callout_fn fn, void *data) 1388af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer{ 1389af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer struct mirror_set *ms = ti->private; 1390af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer int ret = 0; 1391af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer unsigned i; 1392af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer 1393af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer for (i = 0; !ret && i < ms->nr_mirrors; i++) 1394af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer ret = fn(ti, ms->mirror[i].dev, 13955dea271b6d87bd1d79a59c1d5baac2596a841c37Mike Snitzer ms->mirror[i].offset, ti->len, data); 1396af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer 1397af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer return ret; 1398af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer} 1399af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer 14001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic struct target_type mirror_target = { 14011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .name = "mirror", 1402af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer .version = {1, 12, 0}, 14031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .module = THIS_MODULE, 14041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .ctr = mirror_ctr, 14051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .dtr = mirror_dtr, 14061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .map = mirror_map, 14071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .end_io = mirror_end_io, 1408b80aa7a0c268d3ae0c472f648af1e3e4a359765cJonathan Brassow .presuspend = mirror_presuspend, 14091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .postsuspend = mirror_postsuspend, 14101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .resume = mirror_resume, 14111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds .status = mirror_status, 1412af4874e03ed82f050d5872d8c39ce64bf16b5c38Mike Snitzer .iterate_devices = mirror_iterate_devices, 14131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds}; 14141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int __init dm_mirror_init(void) 14161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 14171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int r; 14181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 141995f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka _dm_raid1_read_record_cache = KMEM_CACHE(dm_raid1_read_record, 0); 142095f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka if (!_dm_raid1_read_record_cache) { 142195f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka DMERR("Can't allocate dm_raid1_read_record cache"); 142295f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka r = -ENOMEM; 142395f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka goto bad_cache; 142495f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka } 142595f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka 14261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds r = dm_register_target(&mirror_target); 142795f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka if (r < 0) { 14280cd3312434cd1f29bee6bff53bf2790d733ad2a2Alasdair G Kergon DMERR("Failed to register mirror target"); 142995f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka goto bad_target; 143095f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka } 143195f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka 143295f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka return 0; 14331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 143495f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patockabad_target: 143595f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka kmem_cache_destroy(_dm_raid1_read_record_cache); 143695f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patockabad_cache: 14371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return r; 14381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 14391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic void __exit dm_mirror_exit(void) 14411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 144210d3bd09a3c25df114f74f7f86e1b58d070bef32Mikulas Patocka dm_unregister_target(&mirror_target); 144395f8fac8dc6139fedfb87746e0c8fda9b803cb46Mikulas Patocka kmem_cache_destroy(_dm_raid1_read_record_cache); 14441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 14451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Module hooks */ 14471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_init(dm_mirror_init); 14481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_exit(dm_mirror_exit); 14491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 14501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_DESCRIPTION(DM_NAME " mirror target"); 14511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_AUTHOR("Joe Thornber"); 14521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus TorvaldsMODULE_LICENSE("GPL"); 1453