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 /* 22d6e555bdSGeorge Wilson * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 2401f55e48SGeorge Wilson */ 2501f55e48SGeorge Wilson 2601f55e48SGeorge Wilson /* 27*86714001SSerapheim Dimitropoulos * Copyright (c) 2011, 2017 by Delphix. All rights reserved. 28fa9e4066Sahrens */ 29fa9e4066Sahrens 30fa9e4066Sahrens #ifndef _SYS_METASLAB_IMPL_H 31fa9e4066Sahrens #define _SYS_METASLAB_IMPL_H 32fa9e4066Sahrens 33fa9e4066Sahrens #include <sys/metaslab.h> 34fa9e4066Sahrens #include <sys/space_map.h> 350713e232SGeorge Wilson #include <sys/range_tree.h> 36fa9e4066Sahrens #include <sys/vdev.h> 37fa9e4066Sahrens #include <sys/txg.h> 38fa9e4066Sahrens #include <sys/avl.h> 39fa9e4066Sahrens 40fa9e4066Sahrens #ifdef __cplusplus 41fa9e4066Sahrens extern "C" { 42fa9e4066Sahrens #endif 43fa9e4066Sahrens 448363e80aSGeorge Wilson /* 458363e80aSGeorge Wilson * Metaslab allocation tracing record. 468363e80aSGeorge Wilson */ 478363e80aSGeorge Wilson typedef struct metaslab_alloc_trace { 488363e80aSGeorge Wilson list_node_t mat_list_node; 498363e80aSGeorge Wilson metaslab_group_t *mat_mg; 508363e80aSGeorge Wilson metaslab_t *mat_msp; 518363e80aSGeorge Wilson uint64_t mat_size; 528363e80aSGeorge Wilson uint64_t mat_weight; 538363e80aSGeorge Wilson uint32_t mat_dva_id; 548363e80aSGeorge Wilson uint64_t mat_offset; 558363e80aSGeorge Wilson } metaslab_alloc_trace_t; 568363e80aSGeorge Wilson 578363e80aSGeorge Wilson /* 588363e80aSGeorge Wilson * Used by the metaslab allocation tracing facility to indicate 598363e80aSGeorge Wilson * error conditions. These errors are stored to the offset member 608363e80aSGeorge Wilson * of the metaslab_alloc_trace_t record and displayed by mdb. 618363e80aSGeorge Wilson */ 628363e80aSGeorge Wilson typedef enum trace_alloc_type { 638363e80aSGeorge Wilson TRACE_ALLOC_FAILURE = -1ULL, 648363e80aSGeorge Wilson TRACE_TOO_SMALL = -2ULL, 658363e80aSGeorge Wilson TRACE_FORCE_GANG = -3ULL, 668363e80aSGeorge Wilson TRACE_NOT_ALLOCATABLE = -4ULL, 678363e80aSGeorge Wilson TRACE_GROUP_FAILURE = -5ULL, 688363e80aSGeorge Wilson TRACE_ENOSPC = -6ULL, 698363e80aSGeorge Wilson TRACE_CONDENSING = -7ULL, 708363e80aSGeorge Wilson TRACE_VDEV_ERROR = -8ULL 718363e80aSGeorge Wilson } trace_alloc_type_t; 728363e80aSGeorge Wilson 738363e80aSGeorge Wilson #define METASLAB_WEIGHT_PRIMARY (1ULL << 63) 748363e80aSGeorge Wilson #define METASLAB_WEIGHT_SECONDARY (1ULL << 62) 758363e80aSGeorge Wilson #define METASLAB_WEIGHT_TYPE (1ULL << 61) 768363e80aSGeorge Wilson #define METASLAB_ACTIVE_MASK \ 778363e80aSGeorge Wilson (METASLAB_WEIGHT_PRIMARY | METASLAB_WEIGHT_SECONDARY) 788363e80aSGeorge Wilson 798363e80aSGeorge Wilson /* 808363e80aSGeorge Wilson * The metaslab weight is used to encode the amount of free space in a 818363e80aSGeorge Wilson * metaslab, such that the "best" metaslab appears first when sorting the 828363e80aSGeorge Wilson * metaslabs by weight. The weight (and therefore the "best" metaslab) can 838363e80aSGeorge Wilson * be determined in two different ways: by computing a weighted sum of all 848363e80aSGeorge Wilson * the free space in the metaslab (a space based weight) or by counting only 858363e80aSGeorge Wilson * the free segments of the largest size (a segment based weight). We prefer 868363e80aSGeorge Wilson * the segment based weight because it reflects how the free space is 878363e80aSGeorge Wilson * comprised, but we cannot always use it -- legacy pools do not have the 888363e80aSGeorge Wilson * space map histogram information necessary to determine the largest 898363e80aSGeorge Wilson * contiguous regions. Pools that have the space map histogram determine 908363e80aSGeorge Wilson * the segment weight by looking at each bucket in the histogram and 918363e80aSGeorge Wilson * determining the free space whose size in bytes is in the range: 928363e80aSGeorge Wilson * [2^i, 2^(i+1)) 938363e80aSGeorge Wilson * We then encode the largest index, i, that contains regions into the 948363e80aSGeorge Wilson * segment-weighted value. 958363e80aSGeorge Wilson * 968363e80aSGeorge Wilson * Space-based weight: 978363e80aSGeorge Wilson * 988363e80aSGeorge Wilson * 64 56 48 40 32 24 16 8 0 998363e80aSGeorge Wilson * +-------+-------+-------+-------+-------+-------+-------+-------+ 1008363e80aSGeorge Wilson * |PS1| weighted-free space | 1018363e80aSGeorge Wilson * +-------+-------+-------+-------+-------+-------+-------+-------+ 1028363e80aSGeorge Wilson * 1038363e80aSGeorge Wilson * PS - indicates primary and secondary activation 1048363e80aSGeorge Wilson * space - the fragmentation-weighted space 1058363e80aSGeorge Wilson * 1068363e80aSGeorge Wilson * Segment-based weight: 1078363e80aSGeorge Wilson * 1088363e80aSGeorge Wilson * 64 56 48 40 32 24 16 8 0 1098363e80aSGeorge Wilson * +-------+-------+-------+-------+-------+-------+-------+-------+ 1108363e80aSGeorge Wilson * |PS0| idx| count of segments in region | 1118363e80aSGeorge Wilson * +-------+-------+-------+-------+-------+-------+-------+-------+ 1128363e80aSGeorge Wilson * 1138363e80aSGeorge Wilson * PS - indicates primary and secondary activation 1148363e80aSGeorge Wilson * idx - index for the highest bucket in the histogram 1158363e80aSGeorge Wilson * count - number of segments in the specified bucket 1168363e80aSGeorge Wilson */ 1178363e80aSGeorge Wilson #define WEIGHT_GET_ACTIVE(weight) BF64_GET((weight), 62, 2) 1188363e80aSGeorge Wilson #define WEIGHT_SET_ACTIVE(weight, x) BF64_SET((weight), 62, 2, x) 1198363e80aSGeorge Wilson 1208363e80aSGeorge Wilson #define WEIGHT_IS_SPACEBASED(weight) \ 1218363e80aSGeorge Wilson ((weight) == 0 || BF64_GET((weight), 61, 1)) 1228363e80aSGeorge Wilson #define WEIGHT_SET_SPACEBASED(weight) BF64_SET((weight), 61, 1, 1) 1238363e80aSGeorge Wilson 1248363e80aSGeorge Wilson /* 1258363e80aSGeorge Wilson * These macros are only applicable to segment-based weighting. 1268363e80aSGeorge Wilson */ 1278363e80aSGeorge Wilson #define WEIGHT_GET_INDEX(weight) BF64_GET((weight), 55, 6) 1288363e80aSGeorge Wilson #define WEIGHT_SET_INDEX(weight, x) BF64_SET((weight), 55, 6, x) 1298363e80aSGeorge Wilson #define WEIGHT_GET_COUNT(weight) BF64_GET((weight), 0, 55) 1308363e80aSGeorge Wilson #define WEIGHT_SET_COUNT(weight, x) BF64_SET((weight), 0, 55, x) 1318363e80aSGeorge Wilson 1322e4c9986SGeorge Wilson /* 1332e4c9986SGeorge Wilson * A metaslab class encompasses a category of allocatable top-level vdevs. 1342e4c9986SGeorge Wilson * Each top-level vdev is associated with a metaslab group which defines 1352e4c9986SGeorge Wilson * the allocatable region for that vdev. Examples of these categories include 1362e4c9986SGeorge Wilson * "normal" for data block allocations (i.e. main pool allocations) or "log" 1372e4c9986SGeorge Wilson * for allocations designated for intent log devices (i.e. slog devices). 1382e4c9986SGeorge Wilson * When a block allocation is requested from the SPA it is associated with a 1392e4c9986SGeorge Wilson * metaslab_class_t, and only top-level vdevs (i.e. metaslab groups) belonging 1402e4c9986SGeorge Wilson * to the class can be used to satisfy that request. Allocations are done 1412e4c9986SGeorge Wilson * by traversing the metaslab groups that are linked off of the mc_rotor field. 1422e4c9986SGeorge Wilson * This rotor points to the next metaslab group where allocations will be 1432e4c9986SGeorge Wilson * attempted. Allocating a block is a 3 step process -- select the metaslab 1442e4c9986SGeorge Wilson * group, select the metaslab, and then allocate the block. The metaslab 1452e4c9986SGeorge Wilson * class defines the low-level block allocator that will be used as the 1462e4c9986SGeorge Wilson * final step in allocation. These allocators are pluggable allowing each class 1472e4c9986SGeorge Wilson * to use a block allocator that best suits that class. 1482e4c9986SGeorge Wilson */ 149fa9e4066Sahrens struct metaslab_class { 1500f7643c7SGeorge Wilson kmutex_t mc_lock; 15188ecc943SGeorge Wilson spa_t *mc_spa; 152fa9e4066Sahrens metaslab_group_t *mc_rotor; 1530713e232SGeorge Wilson metaslab_ops_t *mc_ops; 154b24ab676SJeff Bonwick uint64_t mc_aliquot; 1550f7643c7SGeorge Wilson 1560f7643c7SGeorge Wilson /* 1570f7643c7SGeorge Wilson * Track the number of metaslab groups that have been initialized 1580f7643c7SGeorge Wilson * and can accept allocations. An initialized metaslab group is 1590f7643c7SGeorge Wilson * one has been completely added to the config (i.e. we have 1600f7643c7SGeorge Wilson * updated the MOS config and the space has been added to the pool). 1610f7643c7SGeorge Wilson */ 1620f7643c7SGeorge Wilson uint64_t mc_groups; 1630f7643c7SGeorge Wilson 1640f7643c7SGeorge Wilson /* 1650f7643c7SGeorge Wilson * Toggle to enable/disable the allocation throttle. 1660f7643c7SGeorge Wilson */ 1670f7643c7SGeorge Wilson boolean_t mc_alloc_throttle_enabled; 1680f7643c7SGeorge Wilson 1690f7643c7SGeorge Wilson /* 1700f7643c7SGeorge Wilson * The allocation throttle works on a reservation system. Whenever 1710f7643c7SGeorge Wilson * an asynchronous zio wants to perform an allocation it must 1720f7643c7SGeorge Wilson * first reserve the number of blocks that it wants to allocate. 1730f7643c7SGeorge Wilson * If there aren't sufficient slots available for the pending zio 1740f7643c7SGeorge Wilson * then that I/O is throttled until more slots free up. The current 1750f7643c7SGeorge Wilson * number of reserved allocations is maintained by the mc_alloc_slots 1760f7643c7SGeorge Wilson * refcount. The mc_alloc_max_slots value determines the maximum 1770f7643c7SGeorge Wilson * number of allocations that the system allows. Gang blocks are 1780f7643c7SGeorge Wilson * allowed to reserve slots even if we've reached the maximum 1790f7643c7SGeorge Wilson * number of allocations allowed. 1800f7643c7SGeorge Wilson */ 1810f7643c7SGeorge Wilson uint64_t mc_alloc_max_slots; 1820f7643c7SGeorge Wilson refcount_t mc_alloc_slots; 1830f7643c7SGeorge Wilson 18422e30981SGeorge Wilson uint64_t mc_alloc_groups; /* # of allocatable groups */ 1850f7643c7SGeorge Wilson 186b24ab676SJeff Bonwick uint64_t mc_alloc; /* total allocated space */ 187b24ab676SJeff Bonwick uint64_t mc_deferred; /* total deferred frees */ 188b24ab676SJeff Bonwick uint64_t mc_space; /* total space (alloc + free) */ 189b24ab676SJeff Bonwick uint64_t mc_dspace; /* total deflated space */ 1902e4c9986SGeorge Wilson uint64_t mc_histogram[RANGE_TREE_HISTOGRAM_SIZE]; 191fa9e4066Sahrens }; 192fa9e4066Sahrens 1932e4c9986SGeorge Wilson /* 1942e4c9986SGeorge Wilson * Metaslab groups encapsulate all the allocatable regions (i.e. metaslabs) 1952e4c9986SGeorge Wilson * of a top-level vdev. They are linked togther to form a circular linked 1962e4c9986SGeorge Wilson * list and can belong to only one metaslab class. Metaslab groups may become 1972e4c9986SGeorge Wilson * ineligible for allocations for a number of reasons such as limited free 1982e4c9986SGeorge Wilson * space, fragmentation, or going offline. When this happens the allocator will 1992e4c9986SGeorge Wilson * simply find the next metaslab group in the linked list and attempt 2002e4c9986SGeorge Wilson * to allocate from that group instead. 2012e4c9986SGeorge Wilson */ 202fa9e4066Sahrens struct metaslab_group { 203fa9e4066Sahrens kmutex_t mg_lock; 204fa9e4066Sahrens avl_tree_t mg_metaslab_tree; 205fa9e4066Sahrens uint64_t mg_aliquot; 20622e30981SGeorge Wilson boolean_t mg_allocatable; /* can we allocate? */ 2070f7643c7SGeorge Wilson 2080f7643c7SGeorge Wilson /* 2090f7643c7SGeorge Wilson * A metaslab group is considered to be initialized only after 2100f7643c7SGeorge Wilson * we have updated the MOS config and added the space to the pool. 2110f7643c7SGeorge Wilson * We only allow allocation attempts to a metaslab group if it 2120f7643c7SGeorge Wilson * has been initialized. 2130f7643c7SGeorge Wilson */ 2140f7643c7SGeorge Wilson boolean_t mg_initialized; 2150f7643c7SGeorge Wilson 21622e30981SGeorge Wilson uint64_t mg_free_capacity; /* percentage free */ 217fa9e4066Sahrens int64_t mg_bias; 218a1521560SJeff Bonwick int64_t mg_activation_count; 219fa9e4066Sahrens metaslab_class_t *mg_class; 220fa9e4066Sahrens vdev_t *mg_vd; 2210713e232SGeorge Wilson taskq_t *mg_taskq; 222fa9e4066Sahrens metaslab_group_t *mg_prev; 223fa9e4066Sahrens metaslab_group_t *mg_next; 2240f7643c7SGeorge Wilson 2250f7643c7SGeorge Wilson /* 2260f7643c7SGeorge Wilson * Each metaslab group can handle mg_max_alloc_queue_depth allocations 2270f7643c7SGeorge Wilson * which are tracked by mg_alloc_queue_depth. It's possible for a 2280f7643c7SGeorge Wilson * metaslab group to handle more allocations than its max. This 2290f7643c7SGeorge Wilson * can occur when gang blocks are required or when other groups 2300f7643c7SGeorge Wilson * are unable to handle their share of allocations. 2310f7643c7SGeorge Wilson */ 2320f7643c7SGeorge Wilson uint64_t mg_max_alloc_queue_depth; 2330f7643c7SGeorge Wilson refcount_t mg_alloc_queue_depth; 2340f7643c7SGeorge Wilson 2350f7643c7SGeorge Wilson /* 2360f7643c7SGeorge Wilson * A metalab group that can no longer allocate the minimum block 2370f7643c7SGeorge Wilson * size will set mg_no_free_space. Once a metaslab group is out 2380f7643c7SGeorge Wilson * of space then its share of work must be distributed to other 2390f7643c7SGeorge Wilson * groups. 2400f7643c7SGeorge Wilson */ 2410f7643c7SGeorge Wilson boolean_t mg_no_free_space; 2420f7643c7SGeorge Wilson 2430f7643c7SGeorge Wilson uint64_t mg_allocations; 2440f7643c7SGeorge Wilson uint64_t mg_failed_allocations; 2452e4c9986SGeorge Wilson uint64_t mg_fragmentation; 2462e4c9986SGeorge Wilson uint64_t mg_histogram[RANGE_TREE_HISTOGRAM_SIZE]; 247fa9e4066Sahrens }; 248fa9e4066Sahrens 249fa9e4066Sahrens /* 2500713e232SGeorge Wilson * This value defines the number of elements in the ms_lbas array. The value 2512e4c9986SGeorge Wilson * of 64 was chosen as it covers all power of 2 buckets up to UINT64_MAX. 2522e4c9986SGeorge Wilson * This is the equivalent of highbit(UINT64_MAX). 2530713e232SGeorge Wilson */ 2540713e232SGeorge Wilson #define MAX_LBAS 64 2550713e232SGeorge Wilson 2560713e232SGeorge Wilson /* 2575f145778SMatthew Ahrens * Each metaslab maintains a set of in-core trees to track metaslab 258*86714001SSerapheim Dimitropoulos * operations. The in-core free tree (ms_allocatable) contains the list of 2595f145778SMatthew Ahrens * free segments which are eligible for allocation. As blocks are 260*86714001SSerapheim Dimitropoulos * allocated, the allocated segment are removed from the ms_allocatable and 261*86714001SSerapheim Dimitropoulos * added to a per txg allocation tree (ms_allocating). As blocks are 262*86714001SSerapheim Dimitropoulos * freed, they are added to the free tree (ms_freeing). These trees 2635cabbc6bSPrashanth Sreenivasa * allow us to process all allocations and frees in syncing context 2645cabbc6bSPrashanth Sreenivasa * where it is safe to update the on-disk space maps. An additional set 2655cabbc6bSPrashanth Sreenivasa * of in-core trees is maintained to track deferred frees 266*86714001SSerapheim Dimitropoulos * (ms_defer). Once a block is freed it will move from the 267*86714001SSerapheim Dimitropoulos * ms_freed to the ms_defer tree. A deferred free means that a block 2685f145778SMatthew Ahrens * has been freed but cannot be used by the pool until TXG_DEFER_SIZE 2695f145778SMatthew Ahrens * transactions groups later. For example, a block that is freed in txg 2705f145778SMatthew Ahrens * 50 will not be available for reallocation until txg 52 (50 + 2715f145778SMatthew Ahrens * TXG_DEFER_SIZE). This provides a safety net for uberblock rollback. 2725f145778SMatthew Ahrens * A pool could be safely rolled back TXG_DEFERS_SIZE transactions 2735f145778SMatthew Ahrens * groups and ensure that no block has been reallocated. 2740713e232SGeorge Wilson * 2750713e232SGeorge Wilson * The simplified transition diagram looks like this: 2760713e232SGeorge Wilson * 2770713e232SGeorge Wilson * 2780713e232SGeorge Wilson * ALLOCATE 2790713e232SGeorge Wilson * | 2800713e232SGeorge Wilson * V 281*86714001SSerapheim Dimitropoulos * free segment (ms_allocatable) -> ms_allocating[4] -> (write to space map) 2820713e232SGeorge Wilson * ^ 283*86714001SSerapheim Dimitropoulos * | ms_freeing <--- FREE 284*86714001SSerapheim Dimitropoulos * | | 285*86714001SSerapheim Dimitropoulos * | v 286*86714001SSerapheim Dimitropoulos * | ms_freed 287*86714001SSerapheim Dimitropoulos * | | 288*86714001SSerapheim Dimitropoulos * +-------- ms_defer[2] <-------+-------> (write to space map) 28916a4a807SGeorge Wilson * 2900713e232SGeorge Wilson * 2910713e232SGeorge Wilson * Each metaslab's space is tracked in a single space map in the MOS, 2925f145778SMatthew Ahrens * which is only updated in syncing context. Each time we sync a txg, 2935f145778SMatthew Ahrens * we append the allocs and frees from that txg to the space map. The 2945f145778SMatthew Ahrens * pool space is only updated once all metaslabs have finished syncing. 29516a4a807SGeorge Wilson * 2965f145778SMatthew Ahrens * To load the in-core free tree we read the space map from disk. This 2975f145778SMatthew Ahrens * object contains a series of alloc and free records that are combined 2985f145778SMatthew Ahrens * to make up the list of all free segments in this metaslab. These 299*86714001SSerapheim Dimitropoulos * segments are represented in-core by the ms_allocatable and are stored 300*86714001SSerapheim Dimitropoulos * in an AVL tree. 30116a4a807SGeorge Wilson * 3020713e232SGeorge Wilson * As the space map grows (as a result of the appends) it will 3035f145778SMatthew Ahrens * eventually become space-inefficient. When the metaslab's in-core 3045f145778SMatthew Ahrens * free tree is zfs_condense_pct/100 times the size of the minimal 3055f145778SMatthew Ahrens * on-disk representation, we rewrite it in its minimized form. If a 3065f145778SMatthew Ahrens * metaslab needs to condense then we must set the ms_condensing flag to 3075f145778SMatthew Ahrens * ensure that allocations are not performed on the metaslab that is 3085f145778SMatthew Ahrens * being written. 309fa9e4066Sahrens */ 310fa9e4066Sahrens struct metaslab { 3110713e232SGeorge Wilson kmutex_t ms_lock; 3125cabbc6bSPrashanth Sreenivasa kmutex_t ms_sync_lock; 3130713e232SGeorge Wilson kcondvar_t ms_load_cv; 3140713e232SGeorge Wilson space_map_t *ms_sm; 3150713e232SGeorge Wilson uint64_t ms_id; 3160713e232SGeorge Wilson uint64_t ms_start; 3170713e232SGeorge Wilson uint64_t ms_size; 3182e4c9986SGeorge Wilson uint64_t ms_fragmentation; 3190713e232SGeorge Wilson 320*86714001SSerapheim Dimitropoulos range_tree_t *ms_allocating[TXG_SIZE]; 321*86714001SSerapheim Dimitropoulos range_tree_t *ms_allocatable; 3220713e232SGeorge Wilson 3235f145778SMatthew Ahrens /* 3245f145778SMatthew Ahrens * The following range trees are accessed only from syncing context. 3255f145778SMatthew Ahrens * ms_free*tree only have entries while syncing, and are empty 3265f145778SMatthew Ahrens * between syncs. 3275f145778SMatthew Ahrens */ 328*86714001SSerapheim Dimitropoulos range_tree_t *ms_freeing; /* to free this syncing txg */ 329*86714001SSerapheim Dimitropoulos range_tree_t *ms_freed; /* already freed this syncing txg */ 330*86714001SSerapheim Dimitropoulos range_tree_t *ms_defer[TXG_DEFER_SIZE]; 331*86714001SSerapheim Dimitropoulos range_tree_t *ms_checkpointing; /* to add to the checkpoint */ 3325f145778SMatthew Ahrens 3330713e232SGeorge Wilson boolean_t ms_condensing; /* condensing? */ 3342e4c9986SGeorge Wilson boolean_t ms_condense_wanted; 335*86714001SSerapheim Dimitropoulos uint64_t ms_condense_checked_txg; 3368363e80aSGeorge Wilson 3378363e80aSGeorge Wilson /* 3388363e80aSGeorge Wilson * We must hold both ms_lock and ms_group->mg_lock in order to 3398363e80aSGeorge Wilson * modify ms_loaded. 3408363e80aSGeorge Wilson */ 3410713e232SGeorge Wilson boolean_t ms_loaded; 3420713e232SGeorge Wilson boolean_t ms_loading; 3430713e232SGeorge Wilson 344468c413aSTim Haley int64_t ms_deferspace; /* sum of ms_defermap[] space */ 345ecc2d604Sbonwick uint64_t ms_weight; /* weight vs. others in group */ 3468363e80aSGeorge Wilson uint64_t ms_activation_weight; /* activation weight */ 3478363e80aSGeorge Wilson 3488363e80aSGeorge Wilson /* 3498363e80aSGeorge Wilson * Track of whenever a metaslab is selected for loading or allocation. 3508363e80aSGeorge Wilson * We use this value to determine how long the metaslab should 3518363e80aSGeorge Wilson * stay cached. 3528363e80aSGeorge Wilson */ 3538363e80aSGeorge Wilson uint64_t ms_selected_txg; 3548363e80aSGeorge Wilson 3558363e80aSGeorge Wilson uint64_t ms_alloc_txg; /* last successful alloc (debug only) */ 3568363e80aSGeorge Wilson uint64_t ms_max_size; /* maximum allocatable size */ 3570713e232SGeorge Wilson 3580713e232SGeorge Wilson /* 3590713e232SGeorge Wilson * The metaslab block allocators can optionally use a size-ordered 3600713e232SGeorge Wilson * range tree and/or an array of LBAs. Not all allocators use 361*86714001SSerapheim Dimitropoulos * this functionality. The ms_allocatable_by_size should always 362*86714001SSerapheim Dimitropoulos * contain the same number of segments as the ms_allocatable. The 363*86714001SSerapheim Dimitropoulos * only difference is that the ms_allocatable_by_size is ordered by 364*86714001SSerapheim Dimitropoulos * segment sizes. 3650713e232SGeorge Wilson */ 366*86714001SSerapheim Dimitropoulos avl_tree_t ms_allocatable_by_size; 3670713e232SGeorge Wilson uint64_t ms_lbas[MAX_LBAS]; 3680713e232SGeorge Wilson 369ecc2d604Sbonwick metaslab_group_t *ms_group; /* metaslab group */ 370ecc2d604Sbonwick avl_node_t ms_group_node; /* node in metaslab group tree */ 371ecc2d604Sbonwick txg_node_t ms_txg_node; /* per-txg dirty metaslab links */ 372fa9e4066Sahrens }; 373fa9e4066Sahrens 374fa9e4066Sahrens #ifdef __cplusplus 375fa9e4066Sahrens } 376fa9e4066Sahrens #endif 377fa9e4066Sahrens 378fa9e4066Sahrens #endif /* _SYS_METASLAB_IMPL_H */ 379