166325755SMatthew Dillon /* 2*b84de5afSMatthew Dillon * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. 366325755SMatthew Dillon * 466325755SMatthew Dillon * This code is derived from software contributed to The DragonFly Project 566325755SMatthew Dillon * by Matthew Dillon <dillon@backplane.com> 666325755SMatthew Dillon * 766325755SMatthew Dillon * Redistribution and use in source and binary forms, with or without 866325755SMatthew Dillon * modification, are permitted provided that the following conditions 966325755SMatthew Dillon * are met: 1066325755SMatthew Dillon * 1166325755SMatthew Dillon * 1. Redistributions of source code must retain the above copyright 1266325755SMatthew Dillon * notice, this list of conditions and the following disclaimer. 1366325755SMatthew Dillon * 2. Redistributions in binary form must reproduce the above copyright 1466325755SMatthew Dillon * notice, this list of conditions and the following disclaimer in 1566325755SMatthew Dillon * the documentation and/or other materials provided with the 1666325755SMatthew Dillon * distribution. 1766325755SMatthew Dillon * 3. Neither the name of The DragonFly Project nor the names of its 1866325755SMatthew Dillon * contributors may be used to endorse or promote products derived 1966325755SMatthew Dillon * from this software without specific, prior written permission. 2066325755SMatthew Dillon * 2166325755SMatthew Dillon * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 2266325755SMatthew Dillon * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 2366325755SMatthew Dillon * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 2466325755SMatthew Dillon * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 2566325755SMatthew Dillon * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 2666325755SMatthew Dillon * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 2766325755SMatthew Dillon * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 2866325755SMatthew Dillon * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 2966325755SMatthew Dillon * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 3066325755SMatthew Dillon * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 3166325755SMatthew Dillon * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3266325755SMatthew Dillon * SUCH DAMAGE. 3366325755SMatthew Dillon * 34*b84de5afSMatthew Dillon * $DragonFly: src/sys/vfs/hammer/hammer_transaction.c,v 1.12 2008/04/24 21:20:33 dillon Exp $ 3566325755SMatthew Dillon */ 3666325755SMatthew Dillon 3766325755SMatthew Dillon #include "hammer.h" 3866325755SMatthew Dillon 39*b84de5afSMatthew Dillon /* 40*b84de5afSMatthew Dillon * Start a standard transaction. 41*b84de5afSMatthew Dillon */ 4266325755SMatthew Dillon void 438cd0a023SMatthew Dillon hammer_start_transaction(struct hammer_transaction *trans, 448cd0a023SMatthew Dillon struct hammer_mount *hmp) 4566325755SMatthew Dillon { 46a89aec1bSMatthew Dillon int error; 4766325755SMatthew Dillon 48*b84de5afSMatthew Dillon trans->type = HAMMER_TRANS_STD; 4966325755SMatthew Dillon trans->hmp = hmp; 50a89aec1bSMatthew Dillon trans->rootvol = hammer_get_root_volume(hmp, &error); 51a89aec1bSMatthew Dillon KKASSERT(error == 0); 52*b84de5afSMatthew Dillon trans->tid = 0; 53*b84de5afSMatthew Dillon trans->time = hammer_alloc_tid(trans); 5466325755SMatthew Dillon } 5566325755SMatthew Dillon 56*b84de5afSMatthew Dillon /* 57*b84de5afSMatthew Dillon * Start a simple read-only transaction. This will not stall. 58*b84de5afSMatthew Dillon */ 5966325755SMatthew Dillon void 6036f82b23SMatthew Dillon hammer_simple_transaction(struct hammer_transaction *trans, 6136f82b23SMatthew Dillon struct hammer_mount *hmp) 6236f82b23SMatthew Dillon { 6336f82b23SMatthew Dillon int error; 6436f82b23SMatthew Dillon 65*b84de5afSMatthew Dillon trans->type = HAMMER_TRANS_RO; 6636f82b23SMatthew Dillon trans->hmp = hmp; 6736f82b23SMatthew Dillon trans->rootvol = hammer_get_root_volume(hmp, &error); 6836f82b23SMatthew Dillon KKASSERT(error == 0); 69*b84de5afSMatthew Dillon trans->tid = 0; 70*b84de5afSMatthew Dillon trans->time = hammer_alloc_tid(trans); 7136f82b23SMatthew Dillon } 7236f82b23SMatthew Dillon 73*b84de5afSMatthew Dillon /* 74*b84de5afSMatthew Dillon * Start a transaction using a particular TID. Used by the sync code. 75*b84de5afSMatthew Dillon * This does not stall. 76*b84de5afSMatthew Dillon */ 7736f82b23SMatthew Dillon void 78*b84de5afSMatthew Dillon hammer_start_transaction_fls(struct hammer_transaction *trans, 79*b84de5afSMatthew Dillon struct hammer_mount *hmp) 80d113fda1SMatthew Dillon { 81d113fda1SMatthew Dillon int error; 82d113fda1SMatthew Dillon 83*b84de5afSMatthew Dillon trans->type = HAMMER_TRANS_FLS; 84d113fda1SMatthew Dillon trans->hmp = hmp; 85d113fda1SMatthew Dillon trans->rootvol = hammer_get_root_volume(hmp, &error); 86d113fda1SMatthew Dillon KKASSERT(error == 0); 87*b84de5afSMatthew Dillon trans->tid = hammer_alloc_tid(trans); 88*b84de5afSMatthew Dillon trans->time = trans->tid; 89d113fda1SMatthew Dillon } 90d113fda1SMatthew Dillon 91d113fda1SMatthew Dillon void 92*b84de5afSMatthew Dillon hammer_done_transaction(struct hammer_transaction *trans) 9366325755SMatthew Dillon { 94a89aec1bSMatthew Dillon hammer_rel_volume(trans->rootvol, 0); 95*b84de5afSMatthew Dillon trans->rootvol = NULL; 9666325755SMatthew Dillon } 9766325755SMatthew Dillon 98d113fda1SMatthew Dillon /* 99d113fda1SMatthew Dillon * Note: Successive transaction ids must be at least 2 apart so the 100d113fda1SMatthew Dillon * B-Tree code can make a separator that does not match either the 101d113fda1SMatthew Dillon * left or right hand sides. 102d113fda1SMatthew Dillon */ 103a89aec1bSMatthew Dillon hammer_tid_t 104a89aec1bSMatthew Dillon hammer_alloc_tid(hammer_transaction_t trans) 105a89aec1bSMatthew Dillon { 106a89aec1bSMatthew Dillon struct timespec ts; 107a89aec1bSMatthew Dillon hammer_tid_t tid; 108a89aec1bSMatthew Dillon 109a89aec1bSMatthew Dillon getnanotime(&ts); 110a89aec1bSMatthew Dillon tid = ts.tv_sec * 1000000000LL + ts.tv_nsec; 111*b84de5afSMatthew Dillon if (tid < trans->hmp->next_tid) 112*b84de5afSMatthew Dillon tid = trans->hmp->next_tid; 113*b84de5afSMatthew Dillon #if 0 11436f82b23SMatthew Dillon hammer_modify_volume(trans, trans->rootvol, NULL, 0); 115a89aec1bSMatthew Dillon ondisk = trans->rootvol->ondisk; 11647197d71SMatthew Dillon if (tid < ondisk->vol0_next_tid) 11747197d71SMatthew Dillon tid = ondisk->vol0_next_tid; 118*b84de5afSMatthew Dillon #endif 119855942b6SMatthew Dillon if (tid >= 0xFFFFFFFFFFFFFFF0ULL) 120a89aec1bSMatthew Dillon panic("hammer_start_transaction: Ran out of TIDs!"); 121d113fda1SMatthew Dillon if (hammer_debug_tid) { 122d113fda1SMatthew Dillon kprintf("alloc_tid %016llx (0x%08x)\n", 123d113fda1SMatthew Dillon tid, (int)(tid / 1000000000LL)); 124d113fda1SMatthew Dillon } 125*b84de5afSMatthew Dillon #if 0 12647197d71SMatthew Dillon ondisk->vol0_next_tid = tid + 2; 127*b84de5afSMatthew Dillon #endif 128*b84de5afSMatthew Dillon trans->hmp->next_tid = tid + 2; 129a89aec1bSMatthew Dillon return(tid); 130a89aec1bSMatthew Dillon } 131a89aec1bSMatthew Dillon 132