166325755SMatthew Dillon /* 2b84de5afSMatthew 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*0729c8c8SMatthew Dillon * $DragonFly: src/sys/vfs/hammer/hammer_transaction.c,v 1.14 2008/04/29 01:10:37 dillon Exp $ 3566325755SMatthew Dillon */ 3666325755SMatthew Dillon 3766325755SMatthew Dillon #include "hammer.h" 3866325755SMatthew Dillon 39*0729c8c8SMatthew Dillon static hammer_tid_t hammer_alloc_tid(hammer_transaction_t trans, int count); 40*0729c8c8SMatthew Dillon 41*0729c8c8SMatthew Dillon 42b84de5afSMatthew Dillon /* 43b84de5afSMatthew Dillon * Start a standard transaction. 44b84de5afSMatthew Dillon */ 4566325755SMatthew Dillon void 468cd0a023SMatthew Dillon hammer_start_transaction(struct hammer_transaction *trans, 478cd0a023SMatthew Dillon struct hammer_mount *hmp) 4866325755SMatthew Dillon { 49a89aec1bSMatthew Dillon int error; 5066325755SMatthew Dillon 51b84de5afSMatthew Dillon trans->type = HAMMER_TRANS_STD; 5266325755SMatthew Dillon trans->hmp = hmp; 53a89aec1bSMatthew Dillon trans->rootvol = hammer_get_root_volume(hmp, &error); 54a89aec1bSMatthew Dillon KKASSERT(error == 0); 55b84de5afSMatthew Dillon trans->tid = 0; 56*0729c8c8SMatthew Dillon trans->time = hammer_alloc_tid(trans, 1); 5766325755SMatthew Dillon } 5866325755SMatthew Dillon 59b84de5afSMatthew Dillon /* 60b84de5afSMatthew Dillon * Start a simple read-only transaction. This will not stall. 61b84de5afSMatthew Dillon */ 6266325755SMatthew Dillon void 6336f82b23SMatthew Dillon hammer_simple_transaction(struct hammer_transaction *trans, 6436f82b23SMatthew Dillon struct hammer_mount *hmp) 6536f82b23SMatthew Dillon { 6636f82b23SMatthew Dillon int error; 6736f82b23SMatthew Dillon 68b84de5afSMatthew Dillon trans->type = HAMMER_TRANS_RO; 6936f82b23SMatthew Dillon trans->hmp = hmp; 7036f82b23SMatthew Dillon trans->rootvol = hammer_get_root_volume(hmp, &error); 7136f82b23SMatthew Dillon KKASSERT(error == 0); 72b84de5afSMatthew Dillon trans->tid = 0; 73*0729c8c8SMatthew Dillon trans->time = hammer_alloc_tid(trans, 1); 7436f82b23SMatthew Dillon } 7536f82b23SMatthew Dillon 76b84de5afSMatthew Dillon /* 77b84de5afSMatthew Dillon * Start a transaction using a particular TID. Used by the sync code. 78b84de5afSMatthew Dillon * This does not stall. 79b84de5afSMatthew Dillon */ 8036f82b23SMatthew Dillon void 81b84de5afSMatthew Dillon hammer_start_transaction_fls(struct hammer_transaction *trans, 82b84de5afSMatthew Dillon struct hammer_mount *hmp) 83d113fda1SMatthew Dillon { 84d113fda1SMatthew Dillon int error; 85d113fda1SMatthew Dillon 86b84de5afSMatthew Dillon trans->type = HAMMER_TRANS_FLS; 87d113fda1SMatthew Dillon trans->hmp = hmp; 88d113fda1SMatthew Dillon trans->rootvol = hammer_get_root_volume(hmp, &error); 89d113fda1SMatthew Dillon KKASSERT(error == 0); 90*0729c8c8SMatthew Dillon trans->tid = hammer_alloc_tid(trans, 1); 91b84de5afSMatthew Dillon trans->time = trans->tid; 92d113fda1SMatthew Dillon } 93d113fda1SMatthew Dillon 94d113fda1SMatthew Dillon void 95b84de5afSMatthew Dillon hammer_done_transaction(struct hammer_transaction *trans) 9666325755SMatthew Dillon { 97a89aec1bSMatthew Dillon hammer_rel_volume(trans->rootvol, 0); 98b84de5afSMatthew Dillon trans->rootvol = NULL; 9966325755SMatthew Dillon } 10066325755SMatthew Dillon 101d113fda1SMatthew Dillon /* 102d113fda1SMatthew Dillon * Note: Successive transaction ids must be at least 2 apart so the 103d113fda1SMatthew Dillon * B-Tree code can make a separator that does not match either the 104d113fda1SMatthew Dillon * left or right hand sides. 105d113fda1SMatthew Dillon */ 106*0729c8c8SMatthew Dillon static hammer_tid_t 107*0729c8c8SMatthew Dillon hammer_alloc_tid(hammer_transaction_t trans, int count) 108a89aec1bSMatthew Dillon { 109a89aec1bSMatthew Dillon struct timespec ts; 110a89aec1bSMatthew Dillon hammer_tid_t tid; 111a89aec1bSMatthew Dillon 112a89aec1bSMatthew Dillon getnanotime(&ts); 113a89aec1bSMatthew Dillon tid = ts.tv_sec * 1000000000LL + ts.tv_nsec; 114b84de5afSMatthew Dillon if (tid < trans->hmp->next_tid) 115b84de5afSMatthew Dillon tid = trans->hmp->next_tid; 116*0729c8c8SMatthew Dillon if (tid >= 0xFFFFFFFFFFFFF000ULL) 117a89aec1bSMatthew Dillon panic("hammer_start_transaction: Ran out of TIDs!"); 118*0729c8c8SMatthew Dillon trans->hmp->next_tid = tid + count * 2; 119d113fda1SMatthew Dillon if (hammer_debug_tid) { 120d113fda1SMatthew Dillon kprintf("alloc_tid %016llx (0x%08x)\n", 121d113fda1SMatthew Dillon tid, (int)(tid / 1000000000LL)); 122d113fda1SMatthew Dillon } 123a89aec1bSMatthew Dillon return(tid); 124a89aec1bSMatthew Dillon } 125a89aec1bSMatthew Dillon 126*0729c8c8SMatthew Dillon /* 127*0729c8c8SMatthew Dillon * Allocate an object id 128*0729c8c8SMatthew Dillon */ 129*0729c8c8SMatthew Dillon hammer_tid_t 130*0729c8c8SMatthew Dillon hammer_alloc_objid(hammer_transaction_t trans, hammer_inode_t dip) 131*0729c8c8SMatthew Dillon { 132*0729c8c8SMatthew Dillon hammer_objid_cache_t ocp; 133*0729c8c8SMatthew Dillon hammer_tid_t tid; 134*0729c8c8SMatthew Dillon 135*0729c8c8SMatthew Dillon while ((ocp = dip->objid_cache) == NULL) { 136*0729c8c8SMatthew Dillon if (trans->hmp->objid_cache_count < OBJID_CACHE_SIZE) { 137*0729c8c8SMatthew Dillon ocp = kmalloc(sizeof(*ocp), M_HAMMER, M_WAITOK|M_ZERO); 138*0729c8c8SMatthew Dillon ocp->next_tid = hammer_alloc_tid(trans, 139*0729c8c8SMatthew Dillon OBJID_CACHE_BULK); 140*0729c8c8SMatthew Dillon ocp->count = OBJID_CACHE_BULK; 141*0729c8c8SMatthew Dillon TAILQ_INSERT_HEAD(&trans->hmp->objid_cache_list, ocp, 142*0729c8c8SMatthew Dillon entry); 143*0729c8c8SMatthew Dillon ++trans->hmp->objid_cache_count; 144*0729c8c8SMatthew Dillon /* may have blocked, recheck */ 145*0729c8c8SMatthew Dillon if (dip->objid_cache == NULL) { 146*0729c8c8SMatthew Dillon dip->objid_cache = ocp; 147*0729c8c8SMatthew Dillon ocp->dip = dip; 148*0729c8c8SMatthew Dillon } 149*0729c8c8SMatthew Dillon } else { 150*0729c8c8SMatthew Dillon ocp = TAILQ_FIRST(&trans->hmp->objid_cache_list); 151*0729c8c8SMatthew Dillon if (ocp->dip) 152*0729c8c8SMatthew Dillon ocp->dip->objid_cache = NULL; 153*0729c8c8SMatthew Dillon dip->objid_cache = ocp; 154*0729c8c8SMatthew Dillon ocp->dip = dip; 155*0729c8c8SMatthew Dillon } 156*0729c8c8SMatthew Dillon } 157*0729c8c8SMatthew Dillon TAILQ_REMOVE(&trans->hmp->objid_cache_list, ocp, entry); 158*0729c8c8SMatthew Dillon tid = ocp->next_tid; 159*0729c8c8SMatthew Dillon ocp->next_tid += 2; 160*0729c8c8SMatthew Dillon if (--ocp->count == 0) { 161*0729c8c8SMatthew Dillon dip->objid_cache = NULL; 162*0729c8c8SMatthew Dillon --trans->hmp->objid_cache_count; 163*0729c8c8SMatthew Dillon ocp->dip = NULL; 164*0729c8c8SMatthew Dillon kfree(ocp, M_HAMMER); 165*0729c8c8SMatthew Dillon } else { 166*0729c8c8SMatthew Dillon TAILQ_INSERT_TAIL(&trans->hmp->objid_cache_list, ocp, entry); 167*0729c8c8SMatthew Dillon } 168*0729c8c8SMatthew Dillon return(tid); 169*0729c8c8SMatthew Dillon } 170*0729c8c8SMatthew Dillon 171*0729c8c8SMatthew Dillon void 172*0729c8c8SMatthew Dillon hammer_clear_objid(hammer_inode_t dip) 173*0729c8c8SMatthew Dillon { 174*0729c8c8SMatthew Dillon hammer_objid_cache_t ocp; 175*0729c8c8SMatthew Dillon 176*0729c8c8SMatthew Dillon if ((ocp = dip->objid_cache) != NULL) { 177*0729c8c8SMatthew Dillon dip->objid_cache = NULL; 178*0729c8c8SMatthew Dillon ocp->dip = NULL; 179*0729c8c8SMatthew Dillon TAILQ_REMOVE(&dip->hmp->objid_cache_list, ocp, entry); 180*0729c8c8SMatthew Dillon TAILQ_INSERT_HEAD(&dip->hmp->objid_cache_list, ocp, entry); 181*0729c8c8SMatthew Dillon } 182*0729c8c8SMatthew Dillon } 183*0729c8c8SMatthew Dillon 184*0729c8c8SMatthew Dillon void 185*0729c8c8SMatthew Dillon hammer_destroy_objid_cache(hammer_mount_t hmp) 186*0729c8c8SMatthew Dillon { 187*0729c8c8SMatthew Dillon hammer_objid_cache_t ocp; 188*0729c8c8SMatthew Dillon 189*0729c8c8SMatthew Dillon while ((ocp = TAILQ_FIRST(&hmp->objid_cache_list)) != NULL) { 190*0729c8c8SMatthew Dillon TAILQ_REMOVE(&hmp->objid_cache_list, ocp, entry); 191*0729c8c8SMatthew Dillon kfree(ocp, M_HAMMER); 192*0729c8c8SMatthew Dillon } 193*0729c8c8SMatthew Dillon } 194*0729c8c8SMatthew Dillon 195