1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5441d80aaSlling * Common Development and Distribution License (the "License"). 6441d80aaSlling * 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 */ 21ad135b5dSChristopher Siden 22fa9e4066Sahrens /* 233f9d6ad7SLin Ling * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24ad135b5dSChristopher Siden * Copyright (c) 2012 by Delphix. All rights reserved. 25fa9e4066Sahrens */ 26fa9e4066Sahrens 27fa9e4066Sahrens /* 28fa9e4066Sahrens * Virtual Device Labels 29fa9e4066Sahrens * --------------------- 30fa9e4066Sahrens * 31fa9e4066Sahrens * The vdev label serves several distinct purposes: 32fa9e4066Sahrens * 33fa9e4066Sahrens * 1. Uniquely identify this device as part of a ZFS pool and confirm its 34fa9e4066Sahrens * identity within the pool. 35fa9e4066Sahrens * 36fa9e4066Sahrens * 2. Verify that all the devices given in a configuration are present 37fa9e4066Sahrens * within the pool. 38fa9e4066Sahrens * 39fa9e4066Sahrens * 3. Determine the uberblock for the pool. 40fa9e4066Sahrens * 41fa9e4066Sahrens * 4. In case of an import operation, determine the configuration of the 42fa9e4066Sahrens * toplevel vdev of which it is a part. 43fa9e4066Sahrens * 44fa9e4066Sahrens * 5. If an import operation cannot find all the devices in the pool, 45fa9e4066Sahrens * provide enough information to the administrator to determine which 46fa9e4066Sahrens * devices are missing. 47fa9e4066Sahrens * 48fa9e4066Sahrens * It is important to note that while the kernel is responsible for writing the 49fa9e4066Sahrens * label, it only consumes the information in the first three cases. The 50fa9e4066Sahrens * latter information is only consumed in userland when determining the 51fa9e4066Sahrens * configuration to import a pool. 52fa9e4066Sahrens * 53fa9e4066Sahrens * 54fa9e4066Sahrens * Label Organization 55fa9e4066Sahrens * ------------------ 56fa9e4066Sahrens * 57fa9e4066Sahrens * Before describing the contents of the label, it's important to understand how 58fa9e4066Sahrens * the labels are written and updated with respect to the uberblock. 59fa9e4066Sahrens * 60fa9e4066Sahrens * When the pool configuration is altered, either because it was newly created 61fa9e4066Sahrens * or a device was added, we want to update all the labels such that we can deal 62fa9e4066Sahrens * with fatal failure at any point. To this end, each disk has two labels which 63fa9e4066Sahrens * are updated before and after the uberblock is synced. Assuming we have 643d7072f8Seschrock * labels and an uberblock with the following transaction groups: 65fa9e4066Sahrens * 66fa9e4066Sahrens * L1 UB L2 67fa9e4066Sahrens * +------+ +------+ +------+ 68fa9e4066Sahrens * | | | | | | 69fa9e4066Sahrens * | t10 | | t10 | | t10 | 70fa9e4066Sahrens * | | | | | | 71fa9e4066Sahrens * +------+ +------+ +------+ 72fa9e4066Sahrens * 73fa9e4066Sahrens * In this stable state, the labels and the uberblock were all updated within 74fa9e4066Sahrens * the same transaction group (10). Each label is mirrored and checksummed, so 75fa9e4066Sahrens * that we can detect when we fail partway through writing the label. 76fa9e4066Sahrens * 77fa9e4066Sahrens * In order to identify which labels are valid, the labels are written in the 78fa9e4066Sahrens * following manner: 79fa9e4066Sahrens * 80fa9e4066Sahrens * 1. For each vdev, update 'L1' to the new label 81fa9e4066Sahrens * 2. Update the uberblock 82fa9e4066Sahrens * 3. For each vdev, update 'L2' to the new label 83fa9e4066Sahrens * 84fa9e4066Sahrens * Given arbitrary failure, we can determine the correct label to use based on 85fa9e4066Sahrens * the transaction group. If we fail after updating L1 but before updating the 86fa9e4066Sahrens * UB, we will notice that L1's transaction group is greater than the uberblock, 87fa9e4066Sahrens * so L2 must be valid. If we fail after writing the uberblock but before 88fa9e4066Sahrens * writing L2, we will notice that L2's transaction group is less than L1, and 89fa9e4066Sahrens * therefore L1 is valid. 90fa9e4066Sahrens * 91fa9e4066Sahrens * Another added complexity is that not every label is updated when the config 92fa9e4066Sahrens * is synced. If we add a single device, we do not want to have to re-write 93fa9e4066Sahrens * every label for every device in the pool. This means that both L1 and L2 may 94fa9e4066Sahrens * be older than the pool uberblock, because the necessary information is stored 95fa9e4066Sahrens * on another vdev. 96fa9e4066Sahrens * 97fa9e4066Sahrens * 98fa9e4066Sahrens * On-disk Format 99fa9e4066Sahrens * -------------- 100fa9e4066Sahrens * 101fa9e4066Sahrens * The vdev label consists of two distinct parts, and is wrapped within the 102fa9e4066Sahrens * vdev_label_t structure. The label includes 8k of padding to permit legacy 103fa9e4066Sahrens * VTOC disk labels, but is otherwise ignored. 104fa9e4066Sahrens * 105fa9e4066Sahrens * The first half of the label is a packed nvlist which contains pool wide 106fa9e4066Sahrens * properties, per-vdev properties, and configuration information. It is 107fa9e4066Sahrens * described in more detail below. 108fa9e4066Sahrens * 109fa9e4066Sahrens * The latter half of the label consists of a redundant array of uberblocks. 110fa9e4066Sahrens * These uberblocks are updated whenever a transaction group is committed, 111fa9e4066Sahrens * or when the configuration is updated. When a pool is loaded, we scan each 112fa9e4066Sahrens * vdev for the 'best' uberblock. 113fa9e4066Sahrens * 114fa9e4066Sahrens * 115fa9e4066Sahrens * Configuration Information 116fa9e4066Sahrens * ------------------------- 117fa9e4066Sahrens * 118fa9e4066Sahrens * The nvlist describing the pool and vdev contains the following elements: 119fa9e4066Sahrens * 120fa9e4066Sahrens * version ZFS on-disk version 121fa9e4066Sahrens * name Pool name 122fa9e4066Sahrens * state Pool state 123fa9e4066Sahrens * txg Transaction group in which this label was written 124fa9e4066Sahrens * pool_guid Unique identifier for this pool 125fa9e4066Sahrens * vdev_tree An nvlist describing vdev tree. 126ad135b5dSChristopher Siden * features_for_read 127ad135b5dSChristopher Siden * An nvlist of the features necessary for reading the MOS. 128fa9e4066Sahrens * 129fa9e4066Sahrens * Each leaf device label also contains the following: 130fa9e4066Sahrens * 131fa9e4066Sahrens * top_guid Unique ID for top-level vdev in which this is contained 132fa9e4066Sahrens * guid Unique ID for the leaf vdev 133fa9e4066Sahrens * 134fa9e4066Sahrens * The 'vs' configuration follows the format described in 'spa_config.c'. 135fa9e4066Sahrens */ 136fa9e4066Sahrens 137fa9e4066Sahrens #include <sys/zfs_context.h> 138fa9e4066Sahrens #include <sys/spa.h> 139fa9e4066Sahrens #include <sys/spa_impl.h> 140fa9e4066Sahrens #include <sys/dmu.h> 141fa9e4066Sahrens #include <sys/zap.h> 142fa9e4066Sahrens #include <sys/vdev.h> 143fa9e4066Sahrens #include <sys/vdev_impl.h> 144fa9e4066Sahrens #include <sys/uberblock_impl.h> 145fa9e4066Sahrens #include <sys/metaslab.h> 146fa9e4066Sahrens #include <sys/zio.h> 1473f9d6ad7SLin Ling #include <sys/dsl_scan.h> 148fa9e4066Sahrens #include <sys/fs/zfs.h> 149fa9e4066Sahrens 150fa9e4066Sahrens /* 151fa9e4066Sahrens * Basic routines to read and write from a vdev label. 152fa9e4066Sahrens * Used throughout the rest of this file. 153fa9e4066Sahrens */ 154fa9e4066Sahrens uint64_t 155fa9e4066Sahrens vdev_label_offset(uint64_t psize, int l, uint64_t offset) 156fa9e4066Sahrens { 157ecc2d604Sbonwick ASSERT(offset < sizeof (vdev_label_t)); 158e7437265Sahrens ASSERT(P2PHASE_TYPED(psize, sizeof (vdev_label_t), uint64_t) == 0); 159ecc2d604Sbonwick 160fa9e4066Sahrens return (offset + l * sizeof (vdev_label_t) + (l < VDEV_LABELS / 2 ? 161fa9e4066Sahrens 0 : psize - VDEV_LABELS * sizeof (vdev_label_t))); 162fa9e4066Sahrens } 163fa9e4066Sahrens 16421bf64a7Sgw /* 16521bf64a7Sgw * Returns back the vdev label associated with the passed in offset. 16621bf64a7Sgw */ 16721bf64a7Sgw int 16821bf64a7Sgw vdev_label_number(uint64_t psize, uint64_t offset) 16921bf64a7Sgw { 17021bf64a7Sgw int l; 17121bf64a7Sgw 17221bf64a7Sgw if (offset >= psize - VDEV_LABEL_END_SIZE) { 17321bf64a7Sgw offset -= psize - VDEV_LABEL_END_SIZE; 17421bf64a7Sgw offset += (VDEV_LABELS / 2) * sizeof (vdev_label_t); 17521bf64a7Sgw } 17621bf64a7Sgw l = offset / sizeof (vdev_label_t); 17721bf64a7Sgw return (l < VDEV_LABELS ? l : -1); 17821bf64a7Sgw } 17921bf64a7Sgw 180fa9e4066Sahrens static void 181fa9e4066Sahrens vdev_label_read(zio_t *zio, vdev_t *vd, int l, void *buf, uint64_t offset, 182e14bb325SJeff Bonwick uint64_t size, zio_done_func_t *done, void *private, int flags) 183fa9e4066Sahrens { 184e14bb325SJeff Bonwick ASSERT(spa_config_held(zio->io_spa, SCL_STATE_ALL, RW_WRITER) == 185e14bb325SJeff Bonwick SCL_STATE_ALL); 186e14bb325SJeff Bonwick ASSERT(flags & ZIO_FLAG_CONFIG_WRITER); 187fa9e4066Sahrens 188fa9e4066Sahrens zio_nowait(zio_read_phys(zio, vd, 189fa9e4066Sahrens vdev_label_offset(vd->vdev_psize, l, offset), 190fa9e4066Sahrens size, buf, ZIO_CHECKSUM_LABEL, done, private, 191e14bb325SJeff Bonwick ZIO_PRIORITY_SYNC_READ, flags, B_TRUE)); 192fa9e4066Sahrens } 193fa9e4066Sahrens 194fa9e4066Sahrens static void 195fa9e4066Sahrens vdev_label_write(zio_t *zio, vdev_t *vd, int l, void *buf, uint64_t offset, 19617f17c2dSbonwick uint64_t size, zio_done_func_t *done, void *private, int flags) 197fa9e4066Sahrens { 198e14bb325SJeff Bonwick ASSERT(spa_config_held(zio->io_spa, SCL_ALL, RW_WRITER) == SCL_ALL || 199e14bb325SJeff Bonwick (spa_config_held(zio->io_spa, SCL_CONFIG | SCL_STATE, RW_READER) == 200e14bb325SJeff Bonwick (SCL_CONFIG | SCL_STATE) && 201e14bb325SJeff Bonwick dsl_pool_sync_context(spa_get_dsl(zio->io_spa)))); 202e14bb325SJeff Bonwick ASSERT(flags & ZIO_FLAG_CONFIG_WRITER); 203fa9e4066Sahrens 204fa9e4066Sahrens zio_nowait(zio_write_phys(zio, vd, 205fa9e4066Sahrens vdev_label_offset(vd->vdev_psize, l, offset), 206fa9e4066Sahrens size, buf, ZIO_CHECKSUM_LABEL, done, private, 20717f17c2dSbonwick ZIO_PRIORITY_SYNC_WRITE, flags, B_TRUE)); 208fa9e4066Sahrens } 209fa9e4066Sahrens 210fa9e4066Sahrens /* 211fa9e4066Sahrens * Generate the nvlist representing this vdev's config. 212fa9e4066Sahrens */ 213fa9e4066Sahrens nvlist_t * 21499653d4eSeschrock vdev_config_generate(spa_t *spa, vdev_t *vd, boolean_t getstats, 2153f9d6ad7SLin Ling vdev_config_flag_t flags) 216fa9e4066Sahrens { 217fa9e4066Sahrens nvlist_t *nv = NULL; 218fa9e4066Sahrens 219ea8dc4b6Seschrock VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 220fa9e4066Sahrens 221fa9e4066Sahrens VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_TYPE, 222fa9e4066Sahrens vd->vdev_ops->vdev_op_type) == 0); 2233f9d6ad7SLin Ling if (!(flags & (VDEV_CONFIG_SPARE | VDEV_CONFIG_L2CACHE))) 22499653d4eSeschrock VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_ID, vd->vdev_id) 22599653d4eSeschrock == 0); 226fa9e4066Sahrens VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_GUID, vd->vdev_guid) == 0); 227fa9e4066Sahrens 228fa9e4066Sahrens if (vd->vdev_path != NULL) 229fa9e4066Sahrens VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_PATH, 230fa9e4066Sahrens vd->vdev_path) == 0); 231fa9e4066Sahrens 232fa9e4066Sahrens if (vd->vdev_devid != NULL) 233fa9e4066Sahrens VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_DEVID, 234fa9e4066Sahrens vd->vdev_devid) == 0); 235fa9e4066Sahrens 2363d7072f8Seschrock if (vd->vdev_physpath != NULL) 2373d7072f8Seschrock VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_PHYS_PATH, 2383d7072f8Seschrock vd->vdev_physpath) == 0); 2393d7072f8Seschrock 2406809eb4eSEric Schrock if (vd->vdev_fru != NULL) 2416809eb4eSEric Schrock VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_FRU, 2426809eb4eSEric Schrock vd->vdev_fru) == 0); 2436809eb4eSEric Schrock 24499653d4eSeschrock if (vd->vdev_nparity != 0) { 24599653d4eSeschrock ASSERT(strcmp(vd->vdev_ops->vdev_op_type, 24699653d4eSeschrock VDEV_TYPE_RAIDZ) == 0); 24799653d4eSeschrock 24899653d4eSeschrock /* 24999653d4eSeschrock * Make sure someone hasn't managed to sneak a fancy new vdev 25099653d4eSeschrock * into a crufty old storage pool. 25199653d4eSeschrock */ 25299653d4eSeschrock ASSERT(vd->vdev_nparity == 1 || 253f94275ceSAdam Leventhal (vd->vdev_nparity <= 2 && 254f94275ceSAdam Leventhal spa_version(spa) >= SPA_VERSION_RAIDZ2) || 255f94275ceSAdam Leventhal (vd->vdev_nparity <= 3 && 256f94275ceSAdam Leventhal spa_version(spa) >= SPA_VERSION_RAIDZ3)); 25799653d4eSeschrock 25899653d4eSeschrock /* 25999653d4eSeschrock * Note that we'll add the nparity tag even on storage pools 26099653d4eSeschrock * that only support a single parity device -- older software 26199653d4eSeschrock * will just ignore it. 26299653d4eSeschrock */ 26399653d4eSeschrock VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_NPARITY, 26499653d4eSeschrock vd->vdev_nparity) == 0); 26599653d4eSeschrock } 26699653d4eSeschrock 267afefbcddSeschrock if (vd->vdev_wholedisk != -1ULL) 268afefbcddSeschrock VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_WHOLE_DISK, 269afefbcddSeschrock vd->vdev_wholedisk) == 0); 270afefbcddSeschrock 271ea8dc4b6Seschrock if (vd->vdev_not_present) 272ea8dc4b6Seschrock VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_NOT_PRESENT, 1) == 0); 273ea8dc4b6Seschrock 27499653d4eSeschrock if (vd->vdev_isspare) 27599653d4eSeschrock VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_IS_SPARE, 1) == 0); 27699653d4eSeschrock 2773f9d6ad7SLin Ling if (!(flags & (VDEV_CONFIG_SPARE | VDEV_CONFIG_L2CACHE)) && 2783f9d6ad7SLin Ling vd == vd->vdev_top) { 279fa9e4066Sahrens VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_METASLAB_ARRAY, 280fa9e4066Sahrens vd->vdev_ms_array) == 0); 281fa9e4066Sahrens VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_METASLAB_SHIFT, 282fa9e4066Sahrens vd->vdev_ms_shift) == 0); 283fa9e4066Sahrens VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_ASHIFT, 284fa9e4066Sahrens vd->vdev_ashift) == 0); 285fa9e4066Sahrens VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_ASIZE, 286fa9e4066Sahrens vd->vdev_asize) == 0); 2878654d025Sperrin VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_IS_LOG, 2888654d025Sperrin vd->vdev_islog) == 0); 2893f9d6ad7SLin Ling if (vd->vdev_removing) 2903f9d6ad7SLin Ling VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_REMOVING, 2913f9d6ad7SLin Ling vd->vdev_removing) == 0); 292fa9e4066Sahrens } 293fa9e4066Sahrens 2948ad4d6ddSJeff Bonwick if (vd->vdev_dtl_smo.smo_object != 0) 295fa9e4066Sahrens VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_DTL, 2968ad4d6ddSJeff Bonwick vd->vdev_dtl_smo.smo_object) == 0); 297fa9e4066Sahrens 29888ecc943SGeorge Wilson if (vd->vdev_crtxg) 29988ecc943SGeorge Wilson VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_CREATE_TXG, 30088ecc943SGeorge Wilson vd->vdev_crtxg) == 0); 30188ecc943SGeorge Wilson 302fa9e4066Sahrens if (getstats) { 303fa9e4066Sahrens vdev_stat_t vs; 3043f9d6ad7SLin Ling pool_scan_stat_t ps; 3053f9d6ad7SLin Ling 306fa9e4066Sahrens vdev_get_stats(vd, &vs); 3073f9d6ad7SLin Ling VERIFY(nvlist_add_uint64_array(nv, ZPOOL_CONFIG_VDEV_STATS, 308fa9e4066Sahrens (uint64_t *)&vs, sizeof (vs) / sizeof (uint64_t)) == 0); 3093f9d6ad7SLin Ling 3103f9d6ad7SLin Ling /* provide either current or previous scan information */ 3113f9d6ad7SLin Ling if (spa_scan_get_stats(spa, &ps) == 0) { 3123f9d6ad7SLin Ling VERIFY(nvlist_add_uint64_array(nv, 3133f9d6ad7SLin Ling ZPOOL_CONFIG_SCAN_STATS, (uint64_t *)&ps, 3143f9d6ad7SLin Ling sizeof (pool_scan_stat_t) / sizeof (uint64_t)) 3153f9d6ad7SLin Ling == 0); 3163f9d6ad7SLin Ling } 317fa9e4066Sahrens } 318fa9e4066Sahrens 319fa9e4066Sahrens if (!vd->vdev_ops->vdev_op_leaf) { 320fa9e4066Sahrens nvlist_t **child; 3213f9d6ad7SLin Ling int c, idx; 322fa9e4066Sahrens 32388ecc943SGeorge Wilson ASSERT(!vd->vdev_ishole); 32488ecc943SGeorge Wilson 325fa9e4066Sahrens child = kmem_alloc(vd->vdev_children * sizeof (nvlist_t *), 326fa9e4066Sahrens KM_SLEEP); 327fa9e4066Sahrens 3283f9d6ad7SLin Ling for (c = 0, idx = 0; c < vd->vdev_children; c++) { 3293f9d6ad7SLin Ling vdev_t *cvd = vd->vdev_child[c]; 3303f9d6ad7SLin Ling 3313f9d6ad7SLin Ling /* 3323f9d6ad7SLin Ling * If we're generating an nvlist of removing 3333f9d6ad7SLin Ling * vdevs then skip over any device which is 3343f9d6ad7SLin Ling * not being removed. 3353f9d6ad7SLin Ling */ 3363f9d6ad7SLin Ling if ((flags & VDEV_CONFIG_REMOVING) && 3373f9d6ad7SLin Ling !cvd->vdev_removing) 3383f9d6ad7SLin Ling continue; 339fa9e4066Sahrens 3403f9d6ad7SLin Ling child[idx++] = vdev_config_generate(spa, cvd, 3413f9d6ad7SLin Ling getstats, flags); 3423f9d6ad7SLin Ling } 3433f9d6ad7SLin Ling 3443f9d6ad7SLin Ling if (idx) { 3453f9d6ad7SLin Ling VERIFY(nvlist_add_nvlist_array(nv, 3463f9d6ad7SLin Ling ZPOOL_CONFIG_CHILDREN, child, idx) == 0); 3473f9d6ad7SLin Ling } 348fa9e4066Sahrens 3493f9d6ad7SLin Ling for (c = 0; c < idx; c++) 350fa9e4066Sahrens nvlist_free(child[c]); 351fa9e4066Sahrens 352fa9e4066Sahrens kmem_free(child, vd->vdev_children * sizeof (nvlist_t *)); 353441d80aaSlling 354441d80aaSlling } else { 355069f55e2SEric Schrock const char *aux = NULL; 356069f55e2SEric Schrock 357ecc2d604Sbonwick if (vd->vdev_offline && !vd->vdev_tmpoffline) 358441d80aaSlling VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_OFFLINE, 359ecc2d604Sbonwick B_TRUE) == 0); 360cb04b873SMark J Musante if (vd->vdev_resilvering) 361cb04b873SMark J Musante VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_RESILVERING, 362cb04b873SMark J Musante B_TRUE) == 0); 3633d7072f8Seschrock if (vd->vdev_faulted) 3643d7072f8Seschrock VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_FAULTED, 3653d7072f8Seschrock B_TRUE) == 0); 3663d7072f8Seschrock if (vd->vdev_degraded) 3673d7072f8Seschrock VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_DEGRADED, 3683d7072f8Seschrock B_TRUE) == 0); 3693d7072f8Seschrock if (vd->vdev_removed) 3703d7072f8Seschrock VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_REMOVED, 3713d7072f8Seschrock B_TRUE) == 0); 3723d7072f8Seschrock if (vd->vdev_unspare) 3733d7072f8Seschrock VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_UNSPARE, 3743d7072f8Seschrock B_TRUE) == 0); 37588ecc943SGeorge Wilson if (vd->vdev_ishole) 37688ecc943SGeorge Wilson VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_IS_HOLE, 37788ecc943SGeorge Wilson B_TRUE) == 0); 378069f55e2SEric Schrock 379069f55e2SEric Schrock switch (vd->vdev_stat.vs_aux) { 380069f55e2SEric Schrock case VDEV_AUX_ERR_EXCEEDED: 381069f55e2SEric Schrock aux = "err_exceeded"; 382069f55e2SEric Schrock break; 383069f55e2SEric Schrock 384069f55e2SEric Schrock case VDEV_AUX_EXTERNAL: 385069f55e2SEric Schrock aux = "external"; 386069f55e2SEric Schrock break; 387069f55e2SEric Schrock } 388069f55e2SEric Schrock 389069f55e2SEric Schrock if (aux != NULL) 390069f55e2SEric Schrock VERIFY(nvlist_add_string(nv, ZPOOL_CONFIG_AUX_STATE, 391069f55e2SEric Schrock aux) == 0); 3921195e687SMark J Musante 3931195e687SMark J Musante if (vd->vdev_splitting && vd->vdev_orig_guid != 0LL) { 3941195e687SMark J Musante VERIFY(nvlist_add_uint64(nv, ZPOOL_CONFIG_ORIG_GUID, 3951195e687SMark J Musante vd->vdev_orig_guid) == 0); 3961195e687SMark J Musante } 397fa9e4066Sahrens } 398fa9e4066Sahrens 399fa9e4066Sahrens return (nv); 400fa9e4066Sahrens } 401fa9e4066Sahrens 40288ecc943SGeorge Wilson /* 40388ecc943SGeorge Wilson * Generate a view of the top-level vdevs. If we currently have holes 40488ecc943SGeorge Wilson * in the namespace, then generate an array which contains a list of holey 40588ecc943SGeorge Wilson * vdevs. Additionally, add the number of top-level children that currently 40688ecc943SGeorge Wilson * exist. 40788ecc943SGeorge Wilson */ 40888ecc943SGeorge Wilson void 40988ecc943SGeorge Wilson vdev_top_config_generate(spa_t *spa, nvlist_t *config) 41088ecc943SGeorge Wilson { 41188ecc943SGeorge Wilson vdev_t *rvd = spa->spa_root_vdev; 41288ecc943SGeorge Wilson uint64_t *array; 4133f9d6ad7SLin Ling uint_t c, idx; 41488ecc943SGeorge Wilson 41588ecc943SGeorge Wilson array = kmem_alloc(rvd->vdev_children * sizeof (uint64_t), KM_SLEEP); 41688ecc943SGeorge Wilson 4173f9d6ad7SLin Ling for (c = 0, idx = 0; c < rvd->vdev_children; c++) { 41888ecc943SGeorge Wilson vdev_t *tvd = rvd->vdev_child[c]; 41988ecc943SGeorge Wilson 42088ecc943SGeorge Wilson if (tvd->vdev_ishole) 42188ecc943SGeorge Wilson array[idx++] = c; 42288ecc943SGeorge Wilson } 42388ecc943SGeorge Wilson 424312c6e15SGeorge Wilson if (idx) { 425312c6e15SGeorge Wilson VERIFY(nvlist_add_uint64_array(config, ZPOOL_CONFIG_HOLE_ARRAY, 426312c6e15SGeorge Wilson array, idx) == 0); 427312c6e15SGeorge Wilson } 428312c6e15SGeorge Wilson 42988ecc943SGeorge Wilson VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VDEV_CHILDREN, 43088ecc943SGeorge Wilson rvd->vdev_children) == 0); 43188ecc943SGeorge Wilson 43288ecc943SGeorge Wilson kmem_free(array, rvd->vdev_children * sizeof (uint64_t)); 43388ecc943SGeorge Wilson } 43488ecc943SGeorge Wilson 435ad135b5dSChristopher Siden /* 436*dfbb9432SGeorge Wilson * Returns the configuration from the label of the given vdev. For vdevs 437*dfbb9432SGeorge Wilson * which don't have a txg value stored on their label (i.e. spares/cache) 438*dfbb9432SGeorge Wilson * or have not been completely initialized (txg = 0) just return 439*dfbb9432SGeorge Wilson * the configuration from the first valid label we find. Otherwise, 440*dfbb9432SGeorge Wilson * find the most up-to-date label that does not exceed the specified 441*dfbb9432SGeorge Wilson * 'txg' value. 442ad135b5dSChristopher Siden */ 443fa9e4066Sahrens nvlist_t * 444*dfbb9432SGeorge Wilson vdev_label_read_config(vdev_t *vd, uint64_t txg) 445fa9e4066Sahrens { 4460373e76bSbonwick spa_t *spa = vd->vdev_spa; 447fa9e4066Sahrens nvlist_t *config = NULL; 448fa9e4066Sahrens vdev_phys_t *vp; 449fa9e4066Sahrens zio_t *zio; 450*dfbb9432SGeorge Wilson uint64_t best_txg = 0; 451*dfbb9432SGeorge Wilson int error = 0; 4528956713aSEric Schrock int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL | 4538956713aSEric Schrock ZIO_FLAG_SPECULATIVE; 454fa9e4066Sahrens 455e14bb325SJeff Bonwick ASSERT(spa_config_held(spa, SCL_STATE_ALL, RW_WRITER) == SCL_STATE_ALL); 4560373e76bSbonwick 4570a4e9518Sgw if (!vdev_readable(vd)) 458fa9e4066Sahrens return (NULL); 459fa9e4066Sahrens 460fa9e4066Sahrens vp = zio_buf_alloc(sizeof (vdev_phys_t)); 461fa9e4066Sahrens 4628956713aSEric Schrock retry: 463e14bb325SJeff Bonwick for (int l = 0; l < VDEV_LABELS; l++) { 464*dfbb9432SGeorge Wilson nvlist_t *label = NULL; 465fa9e4066Sahrens 466e14bb325SJeff Bonwick zio = zio_root(spa, NULL, NULL, flags); 467fa9e4066Sahrens 468fa9e4066Sahrens vdev_label_read(zio, vd, l, vp, 469fa9e4066Sahrens offsetof(vdev_label_t, vl_vdev_phys), 470e14bb325SJeff Bonwick sizeof (vdev_phys_t), NULL, NULL, flags); 471fa9e4066Sahrens 472fa9e4066Sahrens if (zio_wait(zio) == 0 && 473fa9e4066Sahrens nvlist_unpack(vp->vp_nvlist, sizeof (vp->vp_nvlist), 474*dfbb9432SGeorge Wilson &label, 0) == 0) { 475*dfbb9432SGeorge Wilson uint64_t label_txg = 0; 476*dfbb9432SGeorge Wilson 477*dfbb9432SGeorge Wilson /* 478*dfbb9432SGeorge Wilson * Auxiliary vdevs won't have txg values in their 479*dfbb9432SGeorge Wilson * labels and newly added vdevs may not have been 480*dfbb9432SGeorge Wilson * completely initialized so just return the 481*dfbb9432SGeorge Wilson * configuration from the first valid label we 482*dfbb9432SGeorge Wilson * encounter. 483*dfbb9432SGeorge Wilson */ 484*dfbb9432SGeorge Wilson error = nvlist_lookup_uint64(label, 485*dfbb9432SGeorge Wilson ZPOOL_CONFIG_POOL_TXG, &label_txg); 486*dfbb9432SGeorge Wilson if ((error || label_txg == 0) && !config) { 487*dfbb9432SGeorge Wilson config = label; 488*dfbb9432SGeorge Wilson break; 489*dfbb9432SGeorge Wilson } else if (label_txg <= txg && label_txg > best_txg) { 490*dfbb9432SGeorge Wilson best_txg = label_txg; 491*dfbb9432SGeorge Wilson nvlist_free(config); 492*dfbb9432SGeorge Wilson config = fnvlist_dup(label); 493*dfbb9432SGeorge Wilson } 494*dfbb9432SGeorge Wilson } 495fa9e4066Sahrens 496*dfbb9432SGeorge Wilson if (label != NULL) { 497*dfbb9432SGeorge Wilson nvlist_free(label); 498*dfbb9432SGeorge Wilson label = NULL; 499fa9e4066Sahrens } 500fa9e4066Sahrens } 501fa9e4066Sahrens 5028956713aSEric Schrock if (config == NULL && !(flags & ZIO_FLAG_TRYHARD)) { 5038956713aSEric Schrock flags |= ZIO_FLAG_TRYHARD; 5048956713aSEric Schrock goto retry; 5058956713aSEric Schrock } 5068956713aSEric Schrock 507fa9e4066Sahrens zio_buf_free(vp, sizeof (vdev_phys_t)); 508fa9e4066Sahrens 509fa9e4066Sahrens return (config); 510fa9e4066Sahrens } 511fa9e4066Sahrens 51239c23413Seschrock /* 51339c23413Seschrock * Determine if a device is in use. The 'spare_guid' parameter will be filled 51439c23413Seschrock * in with the device guid if this spare is active elsewhere on the system. 51539c23413Seschrock */ 51639c23413Seschrock static boolean_t 51739c23413Seschrock vdev_inuse(vdev_t *vd, uint64_t crtxg, vdev_labeltype_t reason, 518fa94a07fSbrendan uint64_t *spare_guid, uint64_t *l2cache_guid) 51939c23413Seschrock { 52039c23413Seschrock spa_t *spa = vd->vdev_spa; 52139c23413Seschrock uint64_t state, pool_guid, device_guid, txg, spare_pool; 52239c23413Seschrock uint64_t vdtxg = 0; 52339c23413Seschrock nvlist_t *label; 52439c23413Seschrock 52539c23413Seschrock if (spare_guid) 52639c23413Seschrock *spare_guid = 0ULL; 527fa94a07fSbrendan if (l2cache_guid) 528fa94a07fSbrendan *l2cache_guid = 0ULL; 52939c23413Seschrock 53039c23413Seschrock /* 53139c23413Seschrock * Read the label, if any, and perform some basic sanity checks. 53239c23413Seschrock */ 533*dfbb9432SGeorge Wilson if ((label = vdev_label_read_config(vd, -1ULL)) == NULL) 53439c23413Seschrock return (B_FALSE); 53539c23413Seschrock 53639c23413Seschrock (void) nvlist_lookup_uint64(label, ZPOOL_CONFIG_CREATE_TXG, 53739c23413Seschrock &vdtxg); 53839c23413Seschrock 53939c23413Seschrock if (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_STATE, 54039c23413Seschrock &state) != 0 || 54139c23413Seschrock nvlist_lookup_uint64(label, ZPOOL_CONFIG_GUID, 54239c23413Seschrock &device_guid) != 0) { 54339c23413Seschrock nvlist_free(label); 54439c23413Seschrock return (B_FALSE); 54539c23413Seschrock } 54639c23413Seschrock 547fa94a07fSbrendan if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 54839c23413Seschrock (nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_GUID, 54939c23413Seschrock &pool_guid) != 0 || 55039c23413Seschrock nvlist_lookup_uint64(label, ZPOOL_CONFIG_POOL_TXG, 55139c23413Seschrock &txg) != 0)) { 55239c23413Seschrock nvlist_free(label); 55339c23413Seschrock return (B_FALSE); 55439c23413Seschrock } 55539c23413Seschrock 55639c23413Seschrock nvlist_free(label); 55739c23413Seschrock 55839c23413Seschrock /* 55939c23413Seschrock * Check to see if this device indeed belongs to the pool it claims to 56039c23413Seschrock * be a part of. The only way this is allowed is if the device is a hot 56139c23413Seschrock * spare (which we check for later on). 56239c23413Seschrock */ 563fa94a07fSbrendan if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 56439c23413Seschrock !spa_guid_exists(pool_guid, device_guid) && 56589a89ebfSlling !spa_spare_exists(device_guid, NULL, NULL) && 566fa94a07fSbrendan !spa_l2cache_exists(device_guid, NULL)) 56739c23413Seschrock return (B_FALSE); 56839c23413Seschrock 56939c23413Seschrock /* 57039c23413Seschrock * If the transaction group is zero, then this an initialized (but 57139c23413Seschrock * unused) label. This is only an error if the create transaction 57239c23413Seschrock * on-disk is the same as the one we're using now, in which case the 57339c23413Seschrock * user has attempted to add the same vdev multiple times in the same 57439c23413Seschrock * transaction. 57539c23413Seschrock */ 576fa94a07fSbrendan if (state != POOL_STATE_SPARE && state != POOL_STATE_L2CACHE && 577fa94a07fSbrendan txg == 0 && vdtxg == crtxg) 57839c23413Seschrock return (B_TRUE); 57939c23413Seschrock 58039c23413Seschrock /* 58139c23413Seschrock * Check to see if this is a spare device. We do an explicit check for 58239c23413Seschrock * spa_has_spare() here because it may be on our pending list of spares 583fa94a07fSbrendan * to add. We also check if it is an l2cache device. 58439c23413Seschrock */ 58589a89ebfSlling if (spa_spare_exists(device_guid, &spare_pool, NULL) || 58639c23413Seschrock spa_has_spare(spa, device_guid)) { 58739c23413Seschrock if (spare_guid) 58839c23413Seschrock *spare_guid = device_guid; 58939c23413Seschrock 59039c23413Seschrock switch (reason) { 59139c23413Seschrock case VDEV_LABEL_CREATE: 592fa94a07fSbrendan case VDEV_LABEL_L2CACHE: 59339c23413Seschrock return (B_TRUE); 59439c23413Seschrock 59539c23413Seschrock case VDEV_LABEL_REPLACE: 59639c23413Seschrock return (!spa_has_spare(spa, device_guid) || 59739c23413Seschrock spare_pool != 0ULL); 59839c23413Seschrock 59939c23413Seschrock case VDEV_LABEL_SPARE: 60039c23413Seschrock return (spa_has_spare(spa, device_guid)); 60139c23413Seschrock } 60239c23413Seschrock } 60339c23413Seschrock 604fa94a07fSbrendan /* 605fa94a07fSbrendan * Check to see if this is an l2cache device. 606fa94a07fSbrendan */ 607fa94a07fSbrendan if (spa_l2cache_exists(device_guid, NULL)) 608fa94a07fSbrendan return (B_TRUE); 609fa94a07fSbrendan 610f9af39baSGeorge Wilson /* 611f9af39baSGeorge Wilson * We can't rely on a pool's state if it's been imported 612f9af39baSGeorge Wilson * read-only. Instead we look to see if the pools is marked 613f9af39baSGeorge Wilson * read-only in the namespace and set the state to active. 614f9af39baSGeorge Wilson */ 615f9af39baSGeorge Wilson if ((spa = spa_by_guid(pool_guid, device_guid)) != NULL && 616f9af39baSGeorge Wilson spa_mode(spa) == FREAD) 617f9af39baSGeorge Wilson state = POOL_STATE_ACTIVE; 618f9af39baSGeorge Wilson 61939c23413Seschrock /* 62039c23413Seschrock * If the device is marked ACTIVE, then this device is in use by another 62139c23413Seschrock * pool on the system. 62239c23413Seschrock */ 62339c23413Seschrock return (state == POOL_STATE_ACTIVE); 62439c23413Seschrock } 62539c23413Seschrock 62639c23413Seschrock /* 62739c23413Seschrock * Initialize a vdev label. We check to make sure each leaf device is not in 62839c23413Seschrock * use, and writable. We put down an initial label which we will later 62939c23413Seschrock * overwrite with a complete label. Note that it's important to do this 63039c23413Seschrock * sequentially, not in parallel, so that we catch cases of multiple use of the 63139c23413Seschrock * same leaf vdev in the vdev we're creating -- e.g. mirroring a disk with 63239c23413Seschrock * itself. 63339c23413Seschrock */ 63439c23413Seschrock int 63539c23413Seschrock vdev_label_init(vdev_t *vd, uint64_t crtxg, vdev_labeltype_t reason) 636fa9e4066Sahrens { 637fa9e4066Sahrens spa_t *spa = vd->vdev_spa; 638fa9e4066Sahrens nvlist_t *label; 639fa9e4066Sahrens vdev_phys_t *vp; 640f83ffe1aSLin Ling char *pad2; 641ecc2d604Sbonwick uberblock_t *ub; 642fa9e4066Sahrens zio_t *zio; 643fa9e4066Sahrens char *buf; 644fa9e4066Sahrens size_t buflen; 645fa9e4066Sahrens int error; 646fa94a07fSbrendan uint64_t spare_guid, l2cache_guid; 647e14bb325SJeff Bonwick int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL; 648fa9e4066Sahrens 649e14bb325SJeff Bonwick ASSERT(spa_config_held(spa, SCL_ALL, RW_WRITER) == SCL_ALL); 6500373e76bSbonwick 651e14bb325SJeff Bonwick for (int c = 0; c < vd->vdev_children; c++) 65239c23413Seschrock if ((error = vdev_label_init(vd->vdev_child[c], 65339c23413Seschrock crtxg, reason)) != 0) 654fa9e4066Sahrens return (error); 655fa9e4066Sahrens 65688ecc943SGeorge Wilson /* Track the creation time for this vdev */ 65788ecc943SGeorge Wilson vd->vdev_crtxg = crtxg; 65888ecc943SGeorge Wilson 659fa9e4066Sahrens if (!vd->vdev_ops->vdev_op_leaf) 660fa9e4066Sahrens return (0); 661fa9e4066Sahrens 662fa9e4066Sahrens /* 66339c23413Seschrock * Dead vdevs cannot be initialized. 664fa9e4066Sahrens */ 665fa9e4066Sahrens if (vdev_is_dead(vd)) 666fa9e4066Sahrens return (EIO); 667fa9e4066Sahrens 668fa9e4066Sahrens /* 66939c23413Seschrock * Determine if the vdev is in use. 670fa9e4066Sahrens */ 6711195e687SMark J Musante if (reason != VDEV_LABEL_REMOVE && reason != VDEV_LABEL_SPLIT && 672fa94a07fSbrendan vdev_inuse(vd, crtxg, reason, &spare_guid, &l2cache_guid)) 67339c23413Seschrock return (EBUSY); 67439c23413Seschrock 67539c23413Seschrock /* 676fa94a07fSbrendan * If this is a request to add or replace a spare or l2cache device 677fa94a07fSbrendan * that is in use elsewhere on the system, then we must update the 678fa94a07fSbrendan * guid (which was initialized to a random value) to reflect the 679fa94a07fSbrendan * actual GUID (which is shared between multiple pools). 68039c23413Seschrock */ 681fa94a07fSbrendan if (reason != VDEV_LABEL_REMOVE && reason != VDEV_LABEL_L2CACHE && 682fa94a07fSbrendan spare_guid != 0ULL) { 68331157203SJeff Bonwick uint64_t guid_delta = spare_guid - vd->vdev_guid; 68499653d4eSeschrock 68531157203SJeff Bonwick vd->vdev_guid += guid_delta; 68631157203SJeff Bonwick 68731157203SJeff Bonwick for (vdev_t *pvd = vd; pvd != NULL; pvd = pvd->vdev_parent) 68831157203SJeff Bonwick pvd->vdev_guid_sum += guid_delta; 68939c23413Seschrock 69099653d4eSeschrock /* 69139c23413Seschrock * If this is a replacement, then we want to fallthrough to the 69239c23413Seschrock * rest of the code. If we're adding a spare, then it's already 6933d7072f8Seschrock * labeled appropriately and we can just return. 69499653d4eSeschrock */ 69539c23413Seschrock if (reason == VDEV_LABEL_SPARE) 69639c23413Seschrock return (0); 6971195e687SMark J Musante ASSERT(reason == VDEV_LABEL_REPLACE || 6981195e687SMark J Musante reason == VDEV_LABEL_SPLIT); 699fa9e4066Sahrens } 700fa9e4066Sahrens 701fa94a07fSbrendan if (reason != VDEV_LABEL_REMOVE && reason != VDEV_LABEL_SPARE && 702fa94a07fSbrendan l2cache_guid != 0ULL) { 70331157203SJeff Bonwick uint64_t guid_delta = l2cache_guid - vd->vdev_guid; 70431157203SJeff Bonwick 70531157203SJeff Bonwick vd->vdev_guid += guid_delta; 706fa94a07fSbrendan 70731157203SJeff Bonwick for (vdev_t *pvd = vd; pvd != NULL; pvd = pvd->vdev_parent) 70831157203SJeff Bonwick pvd->vdev_guid_sum += guid_delta; 709fa94a07fSbrendan 710fa94a07fSbrendan /* 711fa94a07fSbrendan * If this is a replacement, then we want to fallthrough to the 712fa94a07fSbrendan * rest of the code. If we're adding an l2cache, then it's 713fa94a07fSbrendan * already labeled appropriately and we can just return. 714fa94a07fSbrendan */ 715fa94a07fSbrendan if (reason == VDEV_LABEL_L2CACHE) 716fa94a07fSbrendan return (0); 717fa94a07fSbrendan ASSERT(reason == VDEV_LABEL_REPLACE); 718fa94a07fSbrendan } 719fa94a07fSbrendan 720fa9e4066Sahrens /* 72139c23413Seschrock * Initialize its label. 722fa9e4066Sahrens */ 723fa9e4066Sahrens vp = zio_buf_alloc(sizeof (vdev_phys_t)); 724fa9e4066Sahrens bzero(vp, sizeof (vdev_phys_t)); 725fa9e4066Sahrens 726fa9e4066Sahrens /* 727fa9e4066Sahrens * Generate a label describing the pool and our top-level vdev. 728fa9e4066Sahrens * We mark it as being from txg 0 to indicate that it's not 729fa9e4066Sahrens * really part of an active pool just yet. The labels will 730fa9e4066Sahrens * be written again with a meaningful txg by spa_sync(). 731fa9e4066Sahrens */ 73239c23413Seschrock if (reason == VDEV_LABEL_SPARE || 73339c23413Seschrock (reason == VDEV_LABEL_REMOVE && vd->vdev_isspare)) { 73439c23413Seschrock /* 73539c23413Seschrock * For inactive hot spares, we generate a special label that 73639c23413Seschrock * identifies as a mutually shared hot spare. We write the 73739c23413Seschrock * label if we are adding a hot spare, or if we are removing an 73839c23413Seschrock * active hot spare (in which case we want to revert the 73939c23413Seschrock * labels). 74039c23413Seschrock */ 74199653d4eSeschrock VERIFY(nvlist_alloc(&label, NV_UNIQUE_NAME, KM_SLEEP) == 0); 74299653d4eSeschrock 74399653d4eSeschrock VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_VERSION, 74499653d4eSeschrock spa_version(spa)) == 0); 74599653d4eSeschrock VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_POOL_STATE, 74699653d4eSeschrock POOL_STATE_SPARE) == 0); 74799653d4eSeschrock VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_GUID, 74899653d4eSeschrock vd->vdev_guid) == 0); 749fa94a07fSbrendan } else if (reason == VDEV_LABEL_L2CACHE || 750fa94a07fSbrendan (reason == VDEV_LABEL_REMOVE && vd->vdev_isl2cache)) { 751fa94a07fSbrendan /* 752fa94a07fSbrendan * For level 2 ARC devices, add a special label. 753fa94a07fSbrendan */ 754fa94a07fSbrendan VERIFY(nvlist_alloc(&label, NV_UNIQUE_NAME, KM_SLEEP) == 0); 755fa94a07fSbrendan 756fa94a07fSbrendan VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_VERSION, 757fa94a07fSbrendan spa_version(spa)) == 0); 758fa94a07fSbrendan VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_POOL_STATE, 759fa94a07fSbrendan POOL_STATE_L2CACHE) == 0); 760fa94a07fSbrendan VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_GUID, 761fa94a07fSbrendan vd->vdev_guid) == 0); 76299653d4eSeschrock } else { 7631195e687SMark J Musante uint64_t txg = 0ULL; 7641195e687SMark J Musante 7651195e687SMark J Musante if (reason == VDEV_LABEL_SPLIT) 7661195e687SMark J Musante txg = spa->spa_uberblock.ub_txg; 7671195e687SMark J Musante label = spa_config_generate(spa, vd, txg, B_FALSE); 76899653d4eSeschrock 76999653d4eSeschrock /* 77099653d4eSeschrock * Add our creation time. This allows us to detect multiple 77199653d4eSeschrock * vdev uses as described above, and automatically expires if we 77299653d4eSeschrock * fail. 77399653d4eSeschrock */ 77499653d4eSeschrock VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_CREATE_TXG, 77599653d4eSeschrock crtxg) == 0); 77699653d4eSeschrock } 777fa9e4066Sahrens 778fa9e4066Sahrens buf = vp->vp_nvlist; 779fa9e4066Sahrens buflen = sizeof (vp->vp_nvlist); 780fa9e4066Sahrens 781a75573b6Smmusante error = nvlist_pack(label, &buf, &buflen, NV_ENCODE_XDR, KM_SLEEP); 782a75573b6Smmusante if (error != 0) { 783fa9e4066Sahrens nvlist_free(label); 784fa9e4066Sahrens zio_buf_free(vp, sizeof (vdev_phys_t)); 785a75573b6Smmusante /* EFAULT means nvlist_pack ran out of room */ 786a75573b6Smmusante return (error == EFAULT ? ENAMETOOLONG : EINVAL); 787fa9e4066Sahrens } 788fa9e4066Sahrens 789fa9e4066Sahrens /* 790fa9e4066Sahrens * Initialize uberblock template. 791fa9e4066Sahrens */ 792f64c0e34SEric Taylor ub = zio_buf_alloc(VDEV_UBERBLOCK_RING); 793f64c0e34SEric Taylor bzero(ub, VDEV_UBERBLOCK_RING); 794ecc2d604Sbonwick *ub = spa->spa_uberblock; 795ecc2d604Sbonwick ub->ub_txg = 0; 796fa9e4066Sahrens 797f83ffe1aSLin Ling /* Initialize the 2nd padding area. */ 798f83ffe1aSLin Ling pad2 = zio_buf_alloc(VDEV_PAD_SIZE); 799f83ffe1aSLin Ling bzero(pad2, VDEV_PAD_SIZE); 800f83ffe1aSLin Ling 801fa9e4066Sahrens /* 802fa9e4066Sahrens * Write everything in parallel. 803fa9e4066Sahrens */ 8048956713aSEric Schrock retry: 80517f17c2dSbonwick zio = zio_root(spa, NULL, NULL, flags); 806fa9e4066Sahrens 807e14bb325SJeff Bonwick for (int l = 0; l < VDEV_LABELS; l++) { 808fa9e4066Sahrens 809fa9e4066Sahrens vdev_label_write(zio, vd, l, vp, 810fa9e4066Sahrens offsetof(vdev_label_t, vl_vdev_phys), 81117f17c2dSbonwick sizeof (vdev_phys_t), NULL, NULL, flags); 812fa9e4066Sahrens 813f83ffe1aSLin Ling /* 814f83ffe1aSLin Ling * Skip the 1st padding area. 815f83ffe1aSLin Ling * Zero out the 2nd padding area where it might have 816f83ffe1aSLin Ling * left over data from previous filesystem format. 817f83ffe1aSLin Ling */ 818f83ffe1aSLin Ling vdev_label_write(zio, vd, l, pad2, 819f83ffe1aSLin Ling offsetof(vdev_label_t, vl_pad2), 820f83ffe1aSLin Ling VDEV_PAD_SIZE, NULL, NULL, flags); 821f83ffe1aSLin Ling 822f64c0e34SEric Taylor vdev_label_write(zio, vd, l, ub, 823f64c0e34SEric Taylor offsetof(vdev_label_t, vl_uberblock), 824f64c0e34SEric Taylor VDEV_UBERBLOCK_RING, NULL, NULL, flags); 825fa9e4066Sahrens } 826fa9e4066Sahrens 827fa9e4066Sahrens error = zio_wait(zio); 828fa9e4066Sahrens 8298956713aSEric Schrock if (error != 0 && !(flags & ZIO_FLAG_TRYHARD)) { 8308956713aSEric Schrock flags |= ZIO_FLAG_TRYHARD; 8318956713aSEric Schrock goto retry; 8328956713aSEric Schrock } 8338956713aSEric Schrock 834fa9e4066Sahrens nvlist_free(label); 835f83ffe1aSLin Ling zio_buf_free(pad2, VDEV_PAD_SIZE); 836f64c0e34SEric Taylor zio_buf_free(ub, VDEV_UBERBLOCK_RING); 837fa9e4066Sahrens zio_buf_free(vp, sizeof (vdev_phys_t)); 838fa9e4066Sahrens 83939c23413Seschrock /* 84039c23413Seschrock * If this vdev hasn't been previously identified as a spare, then we 8413d7072f8Seschrock * mark it as such only if a) we are labeling it as a spare, or b) it 842fa94a07fSbrendan * exists as a spare elsewhere in the system. Do the same for 843fa94a07fSbrendan * level 2 ARC devices. 84439c23413Seschrock */ 84539c23413Seschrock if (error == 0 && !vd->vdev_isspare && 84639c23413Seschrock (reason == VDEV_LABEL_SPARE || 84789a89ebfSlling spa_spare_exists(vd->vdev_guid, NULL, NULL))) 84839c23413Seschrock spa_spare_add(vd); 84999653d4eSeschrock 850fa94a07fSbrendan if (error == 0 && !vd->vdev_isl2cache && 851fa94a07fSbrendan (reason == VDEV_LABEL_L2CACHE || 852fa94a07fSbrendan spa_l2cache_exists(vd->vdev_guid, NULL))) 853fa94a07fSbrendan spa_l2cache_add(vd); 854fa94a07fSbrendan 85539c23413Seschrock return (error); 85699653d4eSeschrock } 85799653d4eSeschrock 858fa9e4066Sahrens /* 859fa9e4066Sahrens * ========================================================================== 860fa9e4066Sahrens * uberblock load/sync 861fa9e4066Sahrens * ========================================================================== 862fa9e4066Sahrens */ 863fa9e4066Sahrens 864fa9e4066Sahrens /* 865fa9e4066Sahrens * Consider the following situation: txg is safely synced to disk. We've 866fa9e4066Sahrens * written the first uberblock for txg + 1, and then we lose power. When we 867fa9e4066Sahrens * come back up, we fail to see the uberblock for txg + 1 because, say, 868fa9e4066Sahrens * it was on a mirrored device and the replica to which we wrote txg + 1 869fa9e4066Sahrens * is now offline. If we then make some changes and sync txg + 1, and then 870ad135b5dSChristopher Siden * the missing replica comes back, then for a few seconds we'll have two 871fa9e4066Sahrens * conflicting uberblocks on disk with the same txg. The solution is simple: 872fa9e4066Sahrens * among uberblocks with equal txg, choose the one with the latest timestamp. 873fa9e4066Sahrens */ 874fa9e4066Sahrens static int 875fa9e4066Sahrens vdev_uberblock_compare(uberblock_t *ub1, uberblock_t *ub2) 876fa9e4066Sahrens { 877fa9e4066Sahrens if (ub1->ub_txg < ub2->ub_txg) 878fa9e4066Sahrens return (-1); 879fa9e4066Sahrens if (ub1->ub_txg > ub2->ub_txg) 880fa9e4066Sahrens return (1); 881fa9e4066Sahrens 882fa9e4066Sahrens if (ub1->ub_timestamp < ub2->ub_timestamp) 883fa9e4066Sahrens return (-1); 884fa9e4066Sahrens if (ub1->ub_timestamp > ub2->ub_timestamp) 885fa9e4066Sahrens return (1); 886fa9e4066Sahrens 887fa9e4066Sahrens return (0); 888fa9e4066Sahrens } 889fa9e4066Sahrens 890ad135b5dSChristopher Siden struct ubl_cbdata { 891ad135b5dSChristopher Siden uberblock_t *ubl_ubbest; /* Best uberblock */ 892ad135b5dSChristopher Siden vdev_t *ubl_vd; /* vdev associated with the above */ 893ad135b5dSChristopher Siden }; 894ad135b5dSChristopher Siden 895fa9e4066Sahrens static void 896fa9e4066Sahrens vdev_uberblock_load_done(zio_t *zio) 897fa9e4066Sahrens { 898ad135b5dSChristopher Siden vdev_t *vd = zio->io_vd; 899468c413aSTim Haley spa_t *spa = zio->io_spa; 900e14bb325SJeff Bonwick zio_t *rio = zio->io_private; 901ecc2d604Sbonwick uberblock_t *ub = zio->io_data; 902ad135b5dSChristopher Siden struct ubl_cbdata *cbp = rio->io_private; 903fa9e4066Sahrens 904ad135b5dSChristopher Siden ASSERT3U(zio->io_size, ==, VDEV_UBERBLOCK_SIZE(vd)); 905fa9e4066Sahrens 906ea8dc4b6Seschrock if (zio->io_error == 0 && uberblock_verify(ub) == 0) { 907e14bb325SJeff Bonwick mutex_enter(&rio->io_lock); 908468c413aSTim Haley if (ub->ub_txg <= spa->spa_load_max_txg && 909ad135b5dSChristopher Siden vdev_uberblock_compare(ub, cbp->ubl_ubbest) > 0) { 910ad135b5dSChristopher Siden /* 911*dfbb9432SGeorge Wilson * Keep track of the vdev in which this uberblock 912*dfbb9432SGeorge Wilson * was found. We will use this information later 913*dfbb9432SGeorge Wilson * to obtain the config nvlist associated with 914ad135b5dSChristopher Siden * this uberblock. 915ad135b5dSChristopher Siden */ 916ad135b5dSChristopher Siden *cbp->ubl_ubbest = *ub; 917ad135b5dSChristopher Siden cbp->ubl_vd = vd; 918ad135b5dSChristopher Siden } 919e14bb325SJeff Bonwick mutex_exit(&rio->io_lock); 920fa9e4066Sahrens } 921fa9e4066Sahrens 922fa9e4066Sahrens zio_buf_free(zio->io_data, zio->io_size); 923fa9e4066Sahrens } 924fa9e4066Sahrens 925ad135b5dSChristopher Siden static void 926ad135b5dSChristopher Siden vdev_uberblock_load_impl(zio_t *zio, vdev_t *vd, int flags, 927ad135b5dSChristopher Siden struct ubl_cbdata *cbp) 928fa9e4066Sahrens { 929e14bb325SJeff Bonwick for (int c = 0; c < vd->vdev_children; c++) 930ad135b5dSChristopher Siden vdev_uberblock_load_impl(zio, vd->vdev_child[c], flags, cbp); 931fa9e4066Sahrens 932e14bb325SJeff Bonwick if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) { 933e14bb325SJeff Bonwick for (int l = 0; l < VDEV_LABELS; l++) { 934e14bb325SJeff Bonwick for (int n = 0; n < VDEV_UBERBLOCK_COUNT(vd); n++) { 935e14bb325SJeff Bonwick vdev_label_read(zio, vd, l, 936e14bb325SJeff Bonwick zio_buf_alloc(VDEV_UBERBLOCK_SIZE(vd)), 937e14bb325SJeff Bonwick VDEV_UBERBLOCK_OFFSET(vd, n), 938e14bb325SJeff Bonwick VDEV_UBERBLOCK_SIZE(vd), 939e14bb325SJeff Bonwick vdev_uberblock_load_done, zio, flags); 940e14bb325SJeff Bonwick } 941fa9e4066Sahrens } 942fa9e4066Sahrens } 943ad135b5dSChristopher Siden } 944e14bb325SJeff Bonwick 945ad135b5dSChristopher Siden /* 946ad135b5dSChristopher Siden * Reads the 'best' uberblock from disk along with its associated 947ad135b5dSChristopher Siden * configuration. First, we read the uberblock array of each label of each 948ad135b5dSChristopher Siden * vdev, keeping track of the uberblock with the highest txg in each array. 949*dfbb9432SGeorge Wilson * Then, we read the configuration from the same vdev as the best uberblock. 950ad135b5dSChristopher Siden */ 951ad135b5dSChristopher Siden void 952ad135b5dSChristopher Siden vdev_uberblock_load(vdev_t *rvd, uberblock_t *ub, nvlist_t **config) 953ad135b5dSChristopher Siden { 954ad135b5dSChristopher Siden zio_t *zio; 955ad135b5dSChristopher Siden spa_t *spa = rvd->vdev_spa; 956ad135b5dSChristopher Siden struct ubl_cbdata cb; 957ad135b5dSChristopher Siden int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL | 958ad135b5dSChristopher Siden ZIO_FLAG_SPECULATIVE | ZIO_FLAG_TRYHARD; 959ad135b5dSChristopher Siden 960ad135b5dSChristopher Siden ASSERT(ub); 961ad135b5dSChristopher Siden ASSERT(config); 962ad135b5dSChristopher Siden 963ad135b5dSChristopher Siden bzero(ub, sizeof (uberblock_t)); 964ad135b5dSChristopher Siden *config = NULL; 965ad135b5dSChristopher Siden 966ad135b5dSChristopher Siden cb.ubl_ubbest = ub; 967ad135b5dSChristopher Siden cb.ubl_vd = NULL; 968ad135b5dSChristopher Siden 969ad135b5dSChristopher Siden spa_config_enter(spa, SCL_ALL, FTAG, RW_WRITER); 970ad135b5dSChristopher Siden zio = zio_root(spa, NULL, &cb, flags); 971ad135b5dSChristopher Siden vdev_uberblock_load_impl(zio, rvd, flags, &cb); 972ad135b5dSChristopher Siden (void) zio_wait(zio); 973*dfbb9432SGeorge Wilson 974*dfbb9432SGeorge Wilson /* 975*dfbb9432SGeorge Wilson * It's possible that the best uberblock was discovered on a label 976*dfbb9432SGeorge Wilson * that has a configuration which was written in a future txg. 977*dfbb9432SGeorge Wilson * Search all labels on this vdev to find the configuration that 978*dfbb9432SGeorge Wilson * matches the txg for our uberblock. 979*dfbb9432SGeorge Wilson */ 980*dfbb9432SGeorge Wilson if (cb.ubl_vd != NULL) 981*dfbb9432SGeorge Wilson *config = vdev_label_read_config(cb.ubl_vd, ub->ub_txg); 982ad135b5dSChristopher Siden spa_config_exit(spa, SCL_ALL, FTAG); 983fa9e4066Sahrens } 984fa9e4066Sahrens 985fa9e4066Sahrens /* 98617f17c2dSbonwick * On success, increment root zio's count of good writes. 9870373e76bSbonwick * We only get credit for writes to known-visible vdevs; see spa_vdev_add(). 988fa9e4066Sahrens */ 989fa9e4066Sahrens static void 990fa9e4066Sahrens vdev_uberblock_sync_done(zio_t *zio) 991fa9e4066Sahrens { 99217f17c2dSbonwick uint64_t *good_writes = zio->io_private; 993fa9e4066Sahrens 9940373e76bSbonwick if (zio->io_error == 0 && zio->io_vd->vdev_top->vdev_ms_array != 0) 995fa9e4066Sahrens atomic_add_64(good_writes, 1); 996fa9e4066Sahrens } 997fa9e4066Sahrens 99817f17c2dSbonwick /* 99917f17c2dSbonwick * Write the uberblock to all labels of all leaves of the specified vdev. 100017f17c2dSbonwick */ 1001fa9e4066Sahrens static void 1002e14bb325SJeff Bonwick vdev_uberblock_sync(zio_t *zio, uberblock_t *ub, vdev_t *vd, int flags) 1003fa9e4066Sahrens { 100417f17c2dSbonwick uberblock_t *ubbuf; 1005e14bb325SJeff Bonwick int n; 1006fa9e4066Sahrens 1007e14bb325SJeff Bonwick for (int c = 0; c < vd->vdev_children; c++) 1008e14bb325SJeff Bonwick vdev_uberblock_sync(zio, ub, vd->vdev_child[c], flags); 1009fa9e4066Sahrens 1010fa9e4066Sahrens if (!vd->vdev_ops->vdev_op_leaf) 1011fa9e4066Sahrens return; 1012fa9e4066Sahrens 1013e14bb325SJeff Bonwick if (!vdev_writeable(vd)) 1014fa9e4066Sahrens return; 1015fa9e4066Sahrens 101617f17c2dSbonwick n = ub->ub_txg & (VDEV_UBERBLOCK_COUNT(vd) - 1); 1017fa9e4066Sahrens 101817f17c2dSbonwick ubbuf = zio_buf_alloc(VDEV_UBERBLOCK_SIZE(vd)); 101917f17c2dSbonwick bzero(ubbuf, VDEV_UBERBLOCK_SIZE(vd)); 102017f17c2dSbonwick *ubbuf = *ub; 1021fa9e4066Sahrens 1022e14bb325SJeff Bonwick for (int l = 0; l < VDEV_LABELS; l++) 102317f17c2dSbonwick vdev_label_write(zio, vd, l, ubbuf, 1024e14bb325SJeff Bonwick VDEV_UBERBLOCK_OFFSET(vd, n), VDEV_UBERBLOCK_SIZE(vd), 102517f17c2dSbonwick vdev_uberblock_sync_done, zio->io_private, 1026e14bb325SJeff Bonwick flags | ZIO_FLAG_DONT_PROPAGATE); 1027fa9e4066Sahrens 102817f17c2dSbonwick zio_buf_free(ubbuf, VDEV_UBERBLOCK_SIZE(vd)); 1029fa9e4066Sahrens } 1030fa9e4066Sahrens 103117f17c2dSbonwick int 103217f17c2dSbonwick vdev_uberblock_sync_list(vdev_t **svd, int svdcount, uberblock_t *ub, int flags) 1033fa9e4066Sahrens { 103417f17c2dSbonwick spa_t *spa = svd[0]->vdev_spa; 1035e14bb325SJeff Bonwick zio_t *zio; 103617f17c2dSbonwick uint64_t good_writes = 0; 1037fa9e4066Sahrens 1038e14bb325SJeff Bonwick zio = zio_root(spa, NULL, &good_writes, flags); 1039e14bb325SJeff Bonwick 1040e14bb325SJeff Bonwick for (int v = 0; v < svdcount; v++) 1041e14bb325SJeff Bonwick vdev_uberblock_sync(zio, ub, svd[v], flags); 1042fa9e4066Sahrens 104317f17c2dSbonwick (void) zio_wait(zio); 1044fa9e4066Sahrens 1045fa9e4066Sahrens /* 104617f17c2dSbonwick * Flush the uberblocks to disk. This ensures that the odd labels 104717f17c2dSbonwick * are no longer needed (because the new uberblocks and the even 104817f17c2dSbonwick * labels are safely on disk), so it is safe to overwrite them. 1049fa9e4066Sahrens */ 105017f17c2dSbonwick zio = zio_root(spa, NULL, NULL, flags); 1051fa9e4066Sahrens 1052e14bb325SJeff Bonwick for (int v = 0; v < svdcount; v++) 105317f17c2dSbonwick zio_flush(zio, svd[v]); 1054fa9e4066Sahrens 105517f17c2dSbonwick (void) zio_wait(zio); 105617f17c2dSbonwick 105717f17c2dSbonwick return (good_writes >= 1 ? 0 : EIO); 1058fa9e4066Sahrens } 1059fa9e4066Sahrens 1060fa9e4066Sahrens /* 106117f17c2dSbonwick * On success, increment the count of good writes for our top-level vdev. 1062fa9e4066Sahrens */ 1063fa9e4066Sahrens static void 106417f17c2dSbonwick vdev_label_sync_done(zio_t *zio) 1065fa9e4066Sahrens { 106617f17c2dSbonwick uint64_t *good_writes = zio->io_private; 1067fa9e4066Sahrens 1068fa9e4066Sahrens if (zio->io_error == 0) 1069fa9e4066Sahrens atomic_add_64(good_writes, 1); 1070fa9e4066Sahrens } 1071fa9e4066Sahrens 107217f17c2dSbonwick /* 107317f17c2dSbonwick * If there weren't enough good writes, indicate failure to the parent. 107417f17c2dSbonwick */ 1075fa9e4066Sahrens static void 107617f17c2dSbonwick vdev_label_sync_top_done(zio_t *zio) 107717f17c2dSbonwick { 107817f17c2dSbonwick uint64_t *good_writes = zio->io_private; 107917f17c2dSbonwick 108017f17c2dSbonwick if (*good_writes == 0) 108117f17c2dSbonwick zio->io_error = EIO; 108217f17c2dSbonwick 108317f17c2dSbonwick kmem_free(good_writes, sizeof (uint64_t)); 108417f17c2dSbonwick } 108517f17c2dSbonwick 108651ece835Seschrock /* 10870430f8daSeschrock * We ignore errors for log and cache devices, simply free the private data. 108851ece835Seschrock */ 108951ece835Seschrock static void 10900430f8daSeschrock vdev_label_sync_ignore_done(zio_t *zio) 109151ece835Seschrock { 109251ece835Seschrock kmem_free(zio->io_private, sizeof (uint64_t)); 109351ece835Seschrock } 109451ece835Seschrock 109517f17c2dSbonwick /* 109617f17c2dSbonwick * Write all even or odd labels to all leaves of the specified vdev. 109717f17c2dSbonwick */ 109817f17c2dSbonwick static void 1099e14bb325SJeff Bonwick vdev_label_sync(zio_t *zio, vdev_t *vd, int l, uint64_t txg, int flags) 1100fa9e4066Sahrens { 1101fa9e4066Sahrens nvlist_t *label; 1102fa9e4066Sahrens vdev_phys_t *vp; 1103fa9e4066Sahrens char *buf; 1104fa9e4066Sahrens size_t buflen; 1105fa9e4066Sahrens 1106e14bb325SJeff Bonwick for (int c = 0; c < vd->vdev_children; c++) 1107e14bb325SJeff Bonwick vdev_label_sync(zio, vd->vdev_child[c], l, txg, flags); 1108fa9e4066Sahrens 1109fa9e4066Sahrens if (!vd->vdev_ops->vdev_op_leaf) 1110fa9e4066Sahrens return; 1111fa9e4066Sahrens 1112e14bb325SJeff Bonwick if (!vdev_writeable(vd)) 1113fa9e4066Sahrens return; 1114fa9e4066Sahrens 1115fa9e4066Sahrens /* 1116fa9e4066Sahrens * Generate a label describing the top-level config to which we belong. 1117fa9e4066Sahrens */ 11180373e76bSbonwick label = spa_config_generate(vd->vdev_spa, vd, txg, B_FALSE); 1119fa9e4066Sahrens 1120fa9e4066Sahrens vp = zio_buf_alloc(sizeof (vdev_phys_t)); 1121fa9e4066Sahrens bzero(vp, sizeof (vdev_phys_t)); 1122fa9e4066Sahrens 1123fa9e4066Sahrens buf = vp->vp_nvlist; 1124fa9e4066Sahrens buflen = sizeof (vp->vp_nvlist); 1125fa9e4066Sahrens 112617f17c2dSbonwick if (nvlist_pack(label, &buf, &buflen, NV_ENCODE_XDR, KM_SLEEP) == 0) { 112717f17c2dSbonwick for (; l < VDEV_LABELS; l += 2) { 112817f17c2dSbonwick vdev_label_write(zio, vd, l, vp, 112917f17c2dSbonwick offsetof(vdev_label_t, vl_vdev_phys), 113017f17c2dSbonwick sizeof (vdev_phys_t), 113117f17c2dSbonwick vdev_label_sync_done, zio->io_private, 1132e14bb325SJeff Bonwick flags | ZIO_FLAG_DONT_PROPAGATE); 113317f17c2dSbonwick } 113417f17c2dSbonwick } 1135fa9e4066Sahrens 1136fa9e4066Sahrens zio_buf_free(vp, sizeof (vdev_phys_t)); 1137fa9e4066Sahrens nvlist_free(label); 1138fa9e4066Sahrens } 1139fa9e4066Sahrens 114017f17c2dSbonwick int 1141e14bb325SJeff Bonwick vdev_label_sync_list(spa_t *spa, int l, uint64_t txg, int flags) 1142fa9e4066Sahrens { 1143e14bb325SJeff Bonwick list_t *dl = &spa->spa_config_dirty_list; 114417f17c2dSbonwick vdev_t *vd; 1145e14bb325SJeff Bonwick zio_t *zio; 1146fa9e4066Sahrens int error; 1147fa9e4066Sahrens 1148fa9e4066Sahrens /* 1149e14bb325SJeff Bonwick * Write the new labels to disk. 1150fa9e4066Sahrens */ 1151e14bb325SJeff Bonwick zio = zio_root(spa, NULL, NULL, flags); 1152fa9e4066Sahrens 115317f17c2dSbonwick for (vd = list_head(dl); vd != NULL; vd = list_next(dl, vd)) { 115417f17c2dSbonwick uint64_t *good_writes = kmem_zalloc(sizeof (uint64_t), 115517f17c2dSbonwick KM_SLEEP); 115688ecc943SGeorge Wilson 115788ecc943SGeorge Wilson ASSERT(!vd->vdev_ishole); 115888ecc943SGeorge Wilson 1159a3f829aeSBill Moore zio_t *vio = zio_null(zio, spa, NULL, 11600430f8daSeschrock (vd->vdev_islog || vd->vdev_aux != NULL) ? 11610430f8daSeschrock vdev_label_sync_ignore_done : vdev_label_sync_top_done, 116217f17c2dSbonwick good_writes, flags); 1163e14bb325SJeff Bonwick vdev_label_sync(vio, vd, l, txg, flags); 116417f17c2dSbonwick zio_nowait(vio); 1165fa9e4066Sahrens } 1166e14bb325SJeff Bonwick 1167e14bb325SJeff Bonwick error = zio_wait(zio); 1168fa9e4066Sahrens 11698654d025Sperrin /* 117017f17c2dSbonwick * Flush the new labels to disk. 11718654d025Sperrin */ 117217f17c2dSbonwick zio = zio_root(spa, NULL, NULL, flags); 11738654d025Sperrin 117417f17c2dSbonwick for (vd = list_head(dl); vd != NULL; vd = list_next(dl, vd)) 117517f17c2dSbonwick zio_flush(zio, vd); 117617f17c2dSbonwick 117717f17c2dSbonwick (void) zio_wait(zio); 1178fa9e4066Sahrens 1179fa9e4066Sahrens return (error); 1180fa9e4066Sahrens } 1181fa9e4066Sahrens 1182fa9e4066Sahrens /* 118317f17c2dSbonwick * Sync the uberblock and any changes to the vdev configuration. 1184fa9e4066Sahrens * 1185fa9e4066Sahrens * The order of operations is carefully crafted to ensure that 1186fa9e4066Sahrens * if the system panics or loses power at any time, the state on disk 1187fa9e4066Sahrens * is still transactionally consistent. The in-line comments below 1188fa9e4066Sahrens * describe the failure semantics at each stage. 1189fa9e4066Sahrens * 119017f17c2dSbonwick * Moreover, vdev_config_sync() is designed to be idempotent: if it fails 1191fa9e4066Sahrens * at any time, you can just call it again, and it will resume its work. 1192fa9e4066Sahrens */ 1193e14bb325SJeff Bonwick int 11948956713aSEric Schrock vdev_config_sync(vdev_t **svd, int svdcount, uint64_t txg, boolean_t tryhard) 1195fa9e4066Sahrens { 119617f17c2dSbonwick spa_t *spa = svd[0]->vdev_spa; 1197fa9e4066Sahrens uberblock_t *ub = &spa->spa_uberblock; 11980373e76bSbonwick vdev_t *vd; 1199fa9e4066Sahrens zio_t *zio; 1200e14bb325SJeff Bonwick int error; 1201e14bb325SJeff Bonwick int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL; 1202fa9e4066Sahrens 12038956713aSEric Schrock /* 12048956713aSEric Schrock * Normally, we don't want to try too hard to write every label and 12058956713aSEric Schrock * uberblock. If there is a flaky disk, we don't want the rest of the 12068956713aSEric Schrock * sync process to block while we retry. But if we can't write a 12078956713aSEric Schrock * single label out, we should retry with ZIO_FLAG_TRYHARD before 12088956713aSEric Schrock * bailing out and declaring the pool faulted. 12098956713aSEric Schrock */ 12108956713aSEric Schrock if (tryhard) 12118956713aSEric Schrock flags |= ZIO_FLAG_TRYHARD; 12128956713aSEric Schrock 1213fa9e4066Sahrens ASSERT(ub->ub_txg <= txg); 1214fa9e4066Sahrens 1215fa9e4066Sahrens /* 121617f17c2dSbonwick * If this isn't a resync due to I/O errors, 121717f17c2dSbonwick * and nothing changed in this transaction group, 121817f17c2dSbonwick * and the vdev configuration hasn't changed, 12190373e76bSbonwick * then there's nothing to do. 1220fa9e4066Sahrens */ 122117f17c2dSbonwick if (ub->ub_txg < txg && 122217f17c2dSbonwick uberblock_update(ub, spa->spa_root_vdev, txg) == B_FALSE && 1223e14bb325SJeff Bonwick list_is_empty(&spa->spa_config_dirty_list)) 1224e14bb325SJeff Bonwick return (0); 1225fa9e4066Sahrens 1226fa9e4066Sahrens if (txg > spa_freeze_txg(spa)) 1227e14bb325SJeff Bonwick return (0); 1228fa9e4066Sahrens 12290373e76bSbonwick ASSERT(txg <= spa->spa_final_txg); 12300373e76bSbonwick 1231fa9e4066Sahrens /* 1232fa9e4066Sahrens * Flush the write cache of every disk that's been written to 1233fa9e4066Sahrens * in this transaction group. This ensures that all blocks 1234fa9e4066Sahrens * written in this txg will be committed to stable storage 1235fa9e4066Sahrens * before any uberblock that references them. 1236fa9e4066Sahrens */ 123717f17c2dSbonwick zio = zio_root(spa, NULL, NULL, flags); 123817f17c2dSbonwick 1239fa9e4066Sahrens for (vd = txg_list_head(&spa->spa_vdev_txg_list, TXG_CLEAN(txg)); vd; 124017f17c2dSbonwick vd = txg_list_next(&spa->spa_vdev_txg_list, vd, TXG_CLEAN(txg))) 124117f17c2dSbonwick zio_flush(zio, vd); 124217f17c2dSbonwick 1243fa9e4066Sahrens (void) zio_wait(zio); 1244fa9e4066Sahrens 1245fa9e4066Sahrens /* 1246fa9e4066Sahrens * Sync out the even labels (L0, L2) for every dirty vdev. If the 1247fa9e4066Sahrens * system dies in the middle of this process, that's OK: all of the 1248fa9e4066Sahrens * even labels that made it to disk will be newer than any uberblock, 1249fa9e4066Sahrens * and will therefore be considered invalid. The odd labels (L1, L3), 125017f17c2dSbonwick * which have not yet been touched, will still be valid. We flush 125117f17c2dSbonwick * the new labels to disk to ensure that all even-label updates 125217f17c2dSbonwick * are committed to stable storage before the uberblock update. 1253fa9e4066Sahrens */ 1254e14bb325SJeff Bonwick if ((error = vdev_label_sync_list(spa, 0, txg, flags)) != 0) 1255e14bb325SJeff Bonwick return (error); 1256fa9e4066Sahrens 1257fa9e4066Sahrens /* 1258e14bb325SJeff Bonwick * Sync the uberblocks to all vdevs in svd[]. 12590373e76bSbonwick * If the system dies in the middle of this step, there are two cases 12600373e76bSbonwick * to consider, and the on-disk state is consistent either way: 1261fa9e4066Sahrens * 1262fa9e4066Sahrens * (1) If none of the new uberblocks made it to disk, then the 1263fa9e4066Sahrens * previous uberblock will be the newest, and the odd labels 1264fa9e4066Sahrens * (which had not yet been touched) will be valid with respect 1265fa9e4066Sahrens * to that uberblock. 1266fa9e4066Sahrens * 1267fa9e4066Sahrens * (2) If one or more new uberblocks made it to disk, then they 1268fa9e4066Sahrens * will be the newest, and the even labels (which had all 1269fa9e4066Sahrens * been successfully committed) will be valid with respect 1270fa9e4066Sahrens * to the new uberblocks. 1271fa9e4066Sahrens */ 1272e14bb325SJeff Bonwick if ((error = vdev_uberblock_sync_list(svd, svdcount, ub, flags)) != 0) 1273e14bb325SJeff Bonwick return (error); 1274fa9e4066Sahrens 1275fa9e4066Sahrens /* 1276fa9e4066Sahrens * Sync out odd labels for every dirty vdev. If the system dies 1277fa9e4066Sahrens * in the middle of this process, the even labels and the new 1278fa9e4066Sahrens * uberblocks will suffice to open the pool. The next time 1279fa9e4066Sahrens * the pool is opened, the first thing we'll do -- before any 1280fa9e4066Sahrens * user data is modified -- is mark every vdev dirty so that 128117f17c2dSbonwick * all labels will be brought up to date. We flush the new labels 128217f17c2dSbonwick * to disk to ensure that all odd-label updates are committed to 128317f17c2dSbonwick * stable storage before the next transaction group begins. 1284fa9e4066Sahrens */ 1285e14bb325SJeff Bonwick return (vdev_label_sync_list(spa, 1, txg, flags)); 1286fa9e4066Sahrens } 1287