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*2f85fa4dSMatthew Dillon * $DragonFly: src/sys/vfs/hammer/hammer_transaction.c,v 1.15 2008/05/18 01:48:50 dillon Exp $ 3566325755SMatthew Dillon */ 3666325755SMatthew Dillon 3766325755SMatthew Dillon #include "hammer.h" 3866325755SMatthew Dillon 390729c8c8SMatthew Dillon static hammer_tid_t hammer_alloc_tid(hammer_transaction_t trans, int count); 400729c8c8SMatthew Dillon 410729c8c8SMatthew 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; 560729c8c8SMatthew Dillon trans->time = hammer_alloc_tid(trans, 1); 57*2f85fa4dSMatthew Dillon trans->sync_lock_refs = 0; 5866325755SMatthew Dillon } 5966325755SMatthew Dillon 60b84de5afSMatthew Dillon /* 61b84de5afSMatthew Dillon * Start a simple read-only transaction. This will not stall. 62b84de5afSMatthew Dillon */ 6366325755SMatthew Dillon void 6436f82b23SMatthew Dillon hammer_simple_transaction(struct hammer_transaction *trans, 6536f82b23SMatthew Dillon struct hammer_mount *hmp) 6636f82b23SMatthew Dillon { 6736f82b23SMatthew Dillon int error; 6836f82b23SMatthew Dillon 69b84de5afSMatthew Dillon trans->type = HAMMER_TRANS_RO; 7036f82b23SMatthew Dillon trans->hmp = hmp; 7136f82b23SMatthew Dillon trans->rootvol = hammer_get_root_volume(hmp, &error); 7236f82b23SMatthew Dillon KKASSERT(error == 0); 73b84de5afSMatthew Dillon trans->tid = 0; 740729c8c8SMatthew Dillon trans->time = hammer_alloc_tid(trans, 1); 75*2f85fa4dSMatthew Dillon trans->sync_lock_refs = 0; 7636f82b23SMatthew Dillon } 7736f82b23SMatthew Dillon 78b84de5afSMatthew Dillon /* 79b84de5afSMatthew Dillon * Start a transaction using a particular TID. Used by the sync code. 80b84de5afSMatthew Dillon * This does not stall. 81*2f85fa4dSMatthew Dillon * 82*2f85fa4dSMatthew Dillon * This routine may only be called from the flusher thread. We predispose 83*2f85fa4dSMatthew Dillon * sync_lock_refs, implying serialization against the synchronization stage 84*2f85fa4dSMatthew Dillon * (which the flusher is responsible for). 85b84de5afSMatthew Dillon */ 8636f82b23SMatthew Dillon void 87b84de5afSMatthew Dillon hammer_start_transaction_fls(struct hammer_transaction *trans, 88b84de5afSMatthew Dillon struct hammer_mount *hmp) 89d113fda1SMatthew Dillon { 90d113fda1SMatthew Dillon int error; 91d113fda1SMatthew Dillon 92*2f85fa4dSMatthew Dillon KKASSERT(curthread == hmp->flusher_td); 93*2f85fa4dSMatthew Dillon 94b84de5afSMatthew Dillon trans->type = HAMMER_TRANS_FLS; 95d113fda1SMatthew Dillon trans->hmp = hmp; 96d113fda1SMatthew Dillon trans->rootvol = hammer_get_root_volume(hmp, &error); 97d113fda1SMatthew Dillon KKASSERT(error == 0); 980729c8c8SMatthew Dillon trans->tid = hammer_alloc_tid(trans, 1); 99b84de5afSMatthew Dillon trans->time = trans->tid; 100*2f85fa4dSMatthew Dillon trans->sync_lock_refs = 1; 101d113fda1SMatthew Dillon } 102d113fda1SMatthew Dillon 103d113fda1SMatthew Dillon void 104b84de5afSMatthew Dillon hammer_done_transaction(struct hammer_transaction *trans) 10566325755SMatthew Dillon { 106*2f85fa4dSMatthew Dillon int expected_lock_refs; 107*2f85fa4dSMatthew Dillon 108a89aec1bSMatthew Dillon hammer_rel_volume(trans->rootvol, 0); 109b84de5afSMatthew Dillon trans->rootvol = NULL; 110*2f85fa4dSMatthew Dillon expected_lock_refs = (trans->type == HAMMER_TRANS_FLS) ? 1 : 0; 111*2f85fa4dSMatthew Dillon KKASSERT(trans->sync_lock_refs == expected_lock_refs); 112*2f85fa4dSMatthew Dillon trans->sync_lock_refs = 0; 11366325755SMatthew Dillon } 11466325755SMatthew Dillon 115d113fda1SMatthew Dillon /* 116d113fda1SMatthew Dillon * Note: Successive transaction ids must be at least 2 apart so the 117d113fda1SMatthew Dillon * B-Tree code can make a separator that does not match either the 118d113fda1SMatthew Dillon * left or right hand sides. 119d113fda1SMatthew Dillon */ 1200729c8c8SMatthew Dillon static hammer_tid_t 1210729c8c8SMatthew Dillon hammer_alloc_tid(hammer_transaction_t trans, int count) 122a89aec1bSMatthew Dillon { 123a89aec1bSMatthew Dillon struct timespec ts; 124a89aec1bSMatthew Dillon hammer_tid_t tid; 125a89aec1bSMatthew Dillon 126a89aec1bSMatthew Dillon getnanotime(&ts); 127a89aec1bSMatthew Dillon tid = ts.tv_sec * 1000000000LL + ts.tv_nsec; 128b84de5afSMatthew Dillon if (tid < trans->hmp->next_tid) 129b84de5afSMatthew Dillon tid = trans->hmp->next_tid; 1300729c8c8SMatthew Dillon if (tid >= 0xFFFFFFFFFFFFF000ULL) 131a89aec1bSMatthew Dillon panic("hammer_start_transaction: Ran out of TIDs!"); 1320729c8c8SMatthew Dillon trans->hmp->next_tid = tid + count * 2; 133d113fda1SMatthew Dillon if (hammer_debug_tid) { 134d113fda1SMatthew Dillon kprintf("alloc_tid %016llx (0x%08x)\n", 135d113fda1SMatthew Dillon tid, (int)(tid / 1000000000LL)); 136d113fda1SMatthew Dillon } 137a89aec1bSMatthew Dillon return(tid); 138a89aec1bSMatthew Dillon } 139a89aec1bSMatthew Dillon 1400729c8c8SMatthew Dillon /* 1410729c8c8SMatthew Dillon * Allocate an object id 1420729c8c8SMatthew Dillon */ 1430729c8c8SMatthew Dillon hammer_tid_t 1440729c8c8SMatthew Dillon hammer_alloc_objid(hammer_transaction_t trans, hammer_inode_t dip) 1450729c8c8SMatthew Dillon { 1460729c8c8SMatthew Dillon hammer_objid_cache_t ocp; 1470729c8c8SMatthew Dillon hammer_tid_t tid; 1480729c8c8SMatthew Dillon 1490729c8c8SMatthew Dillon while ((ocp = dip->objid_cache) == NULL) { 1500729c8c8SMatthew Dillon if (trans->hmp->objid_cache_count < OBJID_CACHE_SIZE) { 1510729c8c8SMatthew Dillon ocp = kmalloc(sizeof(*ocp), M_HAMMER, M_WAITOK|M_ZERO); 1520729c8c8SMatthew Dillon ocp->next_tid = hammer_alloc_tid(trans, 1530729c8c8SMatthew Dillon OBJID_CACHE_BULK); 1540729c8c8SMatthew Dillon ocp->count = OBJID_CACHE_BULK; 1550729c8c8SMatthew Dillon TAILQ_INSERT_HEAD(&trans->hmp->objid_cache_list, ocp, 1560729c8c8SMatthew Dillon entry); 1570729c8c8SMatthew Dillon ++trans->hmp->objid_cache_count; 1580729c8c8SMatthew Dillon /* may have blocked, recheck */ 1590729c8c8SMatthew Dillon if (dip->objid_cache == NULL) { 1600729c8c8SMatthew Dillon dip->objid_cache = ocp; 1610729c8c8SMatthew Dillon ocp->dip = dip; 1620729c8c8SMatthew Dillon } 1630729c8c8SMatthew Dillon } else { 1640729c8c8SMatthew Dillon ocp = TAILQ_FIRST(&trans->hmp->objid_cache_list); 1650729c8c8SMatthew Dillon if (ocp->dip) 1660729c8c8SMatthew Dillon ocp->dip->objid_cache = NULL; 1670729c8c8SMatthew Dillon dip->objid_cache = ocp; 1680729c8c8SMatthew Dillon ocp->dip = dip; 1690729c8c8SMatthew Dillon } 1700729c8c8SMatthew Dillon } 1710729c8c8SMatthew Dillon TAILQ_REMOVE(&trans->hmp->objid_cache_list, ocp, entry); 1720729c8c8SMatthew Dillon tid = ocp->next_tid; 1730729c8c8SMatthew Dillon ocp->next_tid += 2; 1740729c8c8SMatthew Dillon if (--ocp->count == 0) { 1750729c8c8SMatthew Dillon dip->objid_cache = NULL; 1760729c8c8SMatthew Dillon --trans->hmp->objid_cache_count; 1770729c8c8SMatthew Dillon ocp->dip = NULL; 1780729c8c8SMatthew Dillon kfree(ocp, M_HAMMER); 1790729c8c8SMatthew Dillon } else { 1800729c8c8SMatthew Dillon TAILQ_INSERT_TAIL(&trans->hmp->objid_cache_list, ocp, entry); 1810729c8c8SMatthew Dillon } 1820729c8c8SMatthew Dillon return(tid); 1830729c8c8SMatthew Dillon } 1840729c8c8SMatthew Dillon 1850729c8c8SMatthew Dillon void 1860729c8c8SMatthew Dillon hammer_clear_objid(hammer_inode_t dip) 1870729c8c8SMatthew Dillon { 1880729c8c8SMatthew Dillon hammer_objid_cache_t ocp; 1890729c8c8SMatthew Dillon 1900729c8c8SMatthew Dillon if ((ocp = dip->objid_cache) != NULL) { 1910729c8c8SMatthew Dillon dip->objid_cache = NULL; 1920729c8c8SMatthew Dillon ocp->dip = NULL; 1930729c8c8SMatthew Dillon TAILQ_REMOVE(&dip->hmp->objid_cache_list, ocp, entry); 1940729c8c8SMatthew Dillon TAILQ_INSERT_HEAD(&dip->hmp->objid_cache_list, ocp, entry); 1950729c8c8SMatthew Dillon } 1960729c8c8SMatthew Dillon } 1970729c8c8SMatthew Dillon 1980729c8c8SMatthew Dillon void 1990729c8c8SMatthew Dillon hammer_destroy_objid_cache(hammer_mount_t hmp) 2000729c8c8SMatthew Dillon { 2010729c8c8SMatthew Dillon hammer_objid_cache_t ocp; 2020729c8c8SMatthew Dillon 2030729c8c8SMatthew Dillon while ((ocp = TAILQ_FIRST(&hmp->objid_cache_list)) != NULL) { 2040729c8c8SMatthew Dillon TAILQ_REMOVE(&hmp->objid_cache_list, ocp, entry); 2050729c8c8SMatthew Dillon kfree(ocp, M_HAMMER); 2060729c8c8SMatthew Dillon } 2070729c8c8SMatthew Dillon } 2080729c8c8SMatthew Dillon 209