1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ecc2d604Sbonwick * Common Development and Distribution License (the "License"). 6ecc2d604Sbonwick * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 223f9d6ad7SLin Ling * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 2386714001SSerapheim Dimitropoulos * Copyright (c) 2016, 2017 by Delphix. All rights reserved. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #ifndef _SYS_UBERBLOCK_IMPL_H 27fa9e4066Sahrens #define _SYS_UBERBLOCK_IMPL_H 28fa9e4066Sahrens 29fa9e4066Sahrens #include <sys/uberblock.h> 30fa9e4066Sahrens 31fa9e4066Sahrens #ifdef __cplusplus 32fa9e4066Sahrens extern "C" { 33fa9e4066Sahrens #endif 34fa9e4066Sahrens 35fa9e4066Sahrens /* 36fa9e4066Sahrens * The uberblock version is incremented whenever an incompatible on-disk 37fa9e4066Sahrens * format change is made to the SPA, DMU, or ZAP. 38fa9e4066Sahrens * 39fa9e4066Sahrens * Note: the first two fields should never be moved. When a storage pool 40fa9e4066Sahrens * is opened, the uberblock must be read off the disk before the version 41fa9e4066Sahrens * can be checked. If the ub_version field is moved, we may not detect 42fa9e4066Sahrens * version mismatch. If the ub_magic field is moved, applications that 43fa9e4066Sahrens * expect the magic number in the first word won't work. 44fa9e4066Sahrens */ 45fa9e4066Sahrens #define UBERBLOCK_MAGIC 0x00bab10c /* oo-ba-bloc! */ 46ecc2d604Sbonwick #define UBERBLOCK_SHIFT 10 /* up to 1K */ 47*e0f1c0afSOlaf Faaland #define MMP_MAGIC 0xa11cea11 /* all-see-all */ 48fa9e4066Sahrens 49fa9e4066Sahrens struct uberblock { 50fa9e4066Sahrens uint64_t ub_magic; /* UBERBLOCK_MAGIC */ 51e7437265Sahrens uint64_t ub_version; /* SPA_VERSION */ 52fa9e4066Sahrens uint64_t ub_txg; /* txg of last sync */ 53fa9e4066Sahrens uint64_t ub_guid_sum; /* sum of all vdev guids */ 54fa9e4066Sahrens uint64_t ub_timestamp; /* UTC time of last sync */ 55fa9e4066Sahrens blkptr_t ub_rootbp; /* MOS objset_phys_t */ 563f9d6ad7SLin Ling 573f9d6ad7SLin Ling /* highest SPA_VERSION supported by software that wrote this txg */ 583f9d6ad7SLin Ling uint64_t ub_software_version; 5979c2b812SSerapheim Dimitropoulos 60*e0f1c0afSOlaf Faaland /* Maybe missing in uberblocks we read, but always written */ 6179c2b812SSerapheim Dimitropoulos uint64_t ub_mmp_magic; 6279c2b812SSerapheim Dimitropoulos uint64_t ub_mmp_delay; 6379c2b812SSerapheim Dimitropoulos uint64_t ub_mmp_seq; 6486714001SSerapheim Dimitropoulos 6586714001SSerapheim Dimitropoulos /* 6686714001SSerapheim Dimitropoulos * ub_checkpoint_txg indicates two things about the current uberblock: 6786714001SSerapheim Dimitropoulos * 6886714001SSerapheim Dimitropoulos * 1] If it is not zero then this uberblock is a checkpoint. If it is 6986714001SSerapheim Dimitropoulos * zero, then this uberblock is not a checkpoint. 7086714001SSerapheim Dimitropoulos * 7186714001SSerapheim Dimitropoulos * 2] On checkpointed uberblocks, the value of ub_checkpoint_txg is 7286714001SSerapheim Dimitropoulos * the ub_txg that the uberblock had at the time we moved it to 7386714001SSerapheim Dimitropoulos * the MOS config. 7486714001SSerapheim Dimitropoulos * 7586714001SSerapheim Dimitropoulos * The field is set when we checkpoint the uberblock and continues to 7686714001SSerapheim Dimitropoulos * hold that value even after we've rewound (unlike the ub_txg that 7786714001SSerapheim Dimitropoulos * is reset to a higher value). 7886714001SSerapheim Dimitropoulos * 7986714001SSerapheim Dimitropoulos * Besides checks used to determine whether we are reopening the 8086714001SSerapheim Dimitropoulos * pool from a checkpointed uberblock [see spa_ld_select_uberblock()], 8186714001SSerapheim Dimitropoulos * the value of the field is used to determine which ZIL blocks have 8286714001SSerapheim Dimitropoulos * been allocated according to the ms_sm when we are rewinding to a 8386714001SSerapheim Dimitropoulos * checkpoint. Specifically, if blk_birth > ub_checkpoint_txg, then 8486714001SSerapheim Dimitropoulos * the ZIL block is not allocated [see uses of spa_min_claim_txg()]. 8586714001SSerapheim Dimitropoulos */ 8679c2b812SSerapheim Dimitropoulos uint64_t ub_checkpoint_txg; 87fa9e4066Sahrens }; 88fa9e4066Sahrens 89fa9e4066Sahrens #ifdef __cplusplus 90fa9e4066Sahrens } 91fa9e4066Sahrens #endif 92fa9e4066Sahrens 93fa9e4066Sahrens #endif /* _SYS_UBERBLOCK_IMPL_H */ 94