metaslab.c revision 03f8c366886542ed249a15d755ae78ea4e775d9d
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER START
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * The contents of this file are subject to the terms of the
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * Common Development and Distribution License (the "License").
ea8dc4b6d2251b437950c0056bc626b311c73c27eschrock * You may not use this file except in compliance with the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
fa9e4066f08beec538e775443c5be79dd423fcabahrens * or http://www.opensolaris.org/os/licensing.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * See the License for the specific language governing permissions
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and limitations under the License.
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * When distributing Covered Code, include this CDDL HEADER in each
fa9e4066f08beec538e775443c5be79dd423fcabahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If applicable, add the following below this CDDL HEADER, with the
fa9e4066f08beec538e775443c5be79dd423fcabahrens * fields enclosed by brackets "[]" replaced with your own identifying
fa9e4066f08beec538e775443c5be79dd423fcabahrens * information: Portions Copyright [yyyy] [name of copyright owner]
fa9e4066f08beec538e775443c5be79dd423fcabahrens *
fa9e4066f08beec538e775443c5be79dd423fcabahrens * CDDL HEADER END
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
8d18220deb04ec7b12410cd90deb4d45e66d49bfMark J Musante * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
840345f69c01af33ad169d6b4a6ae7ea78b4218aGeorge Wilson * Copyright (c) 2012 by Delphix. All rights reserved.
9dc3941c735ef88de46e850f745aa556d3a071a5Sašo Kiselkov * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zfs_context.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/dmu_tx.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/space_map.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/metaslab_impl.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/vdev_impl.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens#include <sys/zio.h>
fa9e4066f08beec538e775443c5be79dd423fcabahrens
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson/*
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * Allow allocations to switch to gang blocks quickly. We do this to
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * avoid having to load lots of space_maps in a given txg. There are,
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * however, some cases where we want to avoid "fast" ganging and instead
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * we want to do an exhaustive search of all metaslabs on this device.
840345f69c01af33ad169d6b4a6ae7ea78b4218aGeorge Wilson * Currently we don't allow any gang, zil, or dump device related allocations
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * to "fast" gang.
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson */
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson#define CAN_FASTGANG(flags) \
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson (!((flags) & (METASLAB_GANG_CHILD | METASLAB_GANG_HEADER | \
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson METASLAB_GANG_AVOID)))
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson
13506d1eefbbc37e2f12a0528831d9f6d4c361d7maybeeuint64_t metaslab_aliquot = 512ULL << 10;
e05725b117836db173257fae43fb0746eb857fb5bonwickuint64_t metaslab_gang_bang = SPA_MAXBLOCKSIZE + 1; /* force gang blocks */
13506d1eefbbc37e2f12a0528831d9f6d4c361d7maybee
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson/*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * The in-core space map representation is more compact than its on-disk form.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * The zfs_condense_pct determines how much more compact the in-core
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * space_map representation must be before we compact it on-disk.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * Values should be greater than or equal to 100.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilsonint zfs_condense_pct = 200;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson/*
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * This value defines the number of allowed allocation failures per vdev.
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * If a device reaches this threshold in a given txg then we consider skipping
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * allocations on that device.
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson */
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilsonint zfs_mg_alloc_failures;
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick/*
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick * Metaslab debugging: when set, keeps all space maps in core to verify frees.
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick */
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickstatic int metaslab_debug = 0;
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson/*
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * Minimum size which forces the dynamic allocator to change
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * it's allocation strategy. Once the space map cannot satisfy
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * an allocation of this size then it switches to using more
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * aggressive strategy (i.e search by size rather than offset).
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson */
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilsonuint64_t metaslab_df_alloc_threshold = SPA_MAXBLOCKSIZE;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson/*
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * The minimum free space, in percent, which must be available
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * in a space map to continue allocations in a first-fit fashion.
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * Once the space_map's free space drops below this level we dynamically
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * switch to using best-fit allocations.
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonint metaslab_df_free_pct = 4;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson/*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * A metaslab is considered "free" if it contains a contiguous
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * segment which is greater than metaslab_min_alloc_size.
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonuint64_t metaslab_min_alloc_size = DMU_MAX_ACCESS;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson/*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Max number of space_maps to prefetch.
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonint metaslab_prefetch_limit = SPA_DVAS_PER_BP;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson/*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Percentage bonus multiplier for metaslabs that are in the bonus area.
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonint metaslab_smo_bonus_pct = 150;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
9dc3941c735ef88de46e850f745aa556d3a071a5Sašo Kiselkov/*
9dc3941c735ef88de46e850f745aa556d3a071a5Sašo Kiselkov * Should we be willing to write data to degraded vdevs?
9dc3941c735ef88de46e850f745aa556d3a071a5Sašo Kiselkov */
9dc3941c735ef88de46e850f745aa556d3a071a5Sašo Kiselkovboolean_t zfs_write_to_degraded = B_FALSE;
9dc3941c735ef88de46e850f745aa556d3a071a5Sašo Kiselkov
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ==========================================================================
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Metaslab classes
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ==========================================================================
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_class_t *
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilsonmetaslab_class_create(spa_t *spa, space_map_ops_t *ops)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens metaslab_class_t *mc;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mc = kmem_zalloc(sizeof (metaslab_class_t), KM_SLEEP);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson mc->mc_spa = spa;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mc->mc_rotor = NULL;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson mc->mc_ops = ops;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (mc);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_class_destroy(metaslab_class_t *mc)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mc->mc_rotor == NULL);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mc->mc_alloc == 0);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mc->mc_deferred == 0);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mc->mc_space == 0);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mc->mc_dspace == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(mc, sizeof (metaslab_class_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilsonint
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilsonmetaslab_class_validate(metaslab_class_t *mc)
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson{
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson metaslab_group_t *mg;
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson vdev_t *vd;
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson /*
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson * Must hold one of the spa_config locks.
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson */
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson ASSERT(spa_config_held(mc->mc_spa, SCL_ALL, RW_READER) ||
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson spa_config_held(mc->mc_spa, SCL_ALL, RW_WRITER));
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson if ((mg = mc->mc_rotor) == NULL)
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson return (0);
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson do {
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson vd = mg->mg_vd;
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson ASSERT(vd->vdev_mg != NULL);
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson ASSERT3P(vd->vdev_top, ==, vd);
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson ASSERT3P(mg->mg_class, ==, mc);
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson ASSERT3P(vd->vdev_ops, !=, &vdev_hole_ops);
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson } while ((mg = mg->mg_next) != mc->mc_rotor);
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson return (0);
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson}
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickvoid
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickmetaslab_class_space_update(metaslab_class_t *mc, int64_t alloc_delta,
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick int64_t defer_delta, int64_t space_delta, int64_t dspace_delta)
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick{
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick atomic_add_64(&mc->mc_alloc, alloc_delta);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick atomic_add_64(&mc->mc_deferred, defer_delta);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick atomic_add_64(&mc->mc_space, space_delta);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick atomic_add_64(&mc->mc_dspace, dspace_delta);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick}
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickuint64_t
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickmetaslab_class_get_alloc(metaslab_class_t *mc)
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick{
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick return (mc->mc_alloc);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick}
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickuint64_t
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickmetaslab_class_get_deferred(metaslab_class_t *mc)
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick{
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick return (mc->mc_deferred);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick}
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickuint64_t
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickmetaslab_class_get_space(metaslab_class_t *mc)
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick{
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick return (mc->mc_space);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick}
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickuint64_t
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwickmetaslab_class_get_dspace(metaslab_class_t *mc)
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick{
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick return (spa_deflate(mc->mc_spa) ? mc->mc_dspace : mc->mc_space);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick}
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ==========================================================================
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Metaslab groups
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ==========================================================================
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensstatic int
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_compare(const void *x1, const void *x2)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens const metaslab_t *m1 = x1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens const metaslab_t *m2 = x2;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (m1->ms_weight < m2->ms_weight)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (m1->ms_weight > m2->ms_weight)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (-1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If the weights are identical, use the offset to force uniqueness.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (m1->ms_map->sm_start < m2->ms_map->sm_start)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (-1);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (m1->ms_map->sm_start > m2->ms_map->sm_start)
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT3P(m1, ==, m2);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_group_t *
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_group_create(metaslab_class_t *mc, vdev_t *vd)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens metaslab_group_t *mg;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mg = kmem_zalloc(sizeof (metaslab_group_t), KM_SLEEP);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_init(&mg->mg_lock, NULL, MUTEX_DEFAULT, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_create(&mg->mg_metaslab_tree, metaslab_compare,
fa9e4066f08beec538e775443c5be79dd423fcabahrens sizeof (metaslab_t), offsetof(struct metaslab, ms_group_node));
fa9e4066f08beec538e775443c5be79dd423fcabahrens mg->mg_vd = vd;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mg->mg_class = mc;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mg->mg_activation_count = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (mg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_group_destroy(metaslab_group_t *mg)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mg->mg_prev == NULL);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mg->mg_next == NULL);
a33cae9802e94744efee12a7a77c89360645eae8Tim Haley /*
a33cae9802e94744efee12a7a77c89360645eae8Tim Haley * We may have gone below zero with the activation count
a33cae9802e94744efee12a7a77c89360645eae8Tim Haley * either because we never activated in the first place or
a33cae9802e94744efee12a7a77c89360645eae8Tim Haley * because we're done, and possibly removing the vdev.
a33cae9802e94744efee12a7a77c89360645eae8Tim Haley */
a33cae9802e94744efee12a7a77c89360645eae8Tim Haley ASSERT(mg->mg_activation_count <= 0);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_destroy(&mg->mg_metaslab_tree);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_destroy(&mg->mg_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(mg, sizeof (metaslab_group_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwickvoid
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwickmetaslab_group_activate(metaslab_group_t *mg)
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick{
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick metaslab_class_t *mc = mg->mg_class;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick metaslab_group_t *mgprev, *mgnext;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(spa_config_held(mc->mc_spa, SCL_ALLOC, RW_WRITER));
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mc->mc_rotor != mg);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mg->mg_prev == NULL);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mg->mg_next == NULL);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mg->mg_activation_count <= 0);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick if (++mg->mg_activation_count <= 0)
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick return;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mg->mg_aliquot = metaslab_aliquot * MAX(1, mg->mg_vd->vdev_children);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick if ((mgprev = mc->mc_rotor) == NULL) {
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mg->mg_prev = mg;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mg->mg_next = mg;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick } else {
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mgnext = mgprev->mg_next;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mg->mg_prev = mgprev;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mg->mg_next = mgnext;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mgprev->mg_next = mg;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mgnext->mg_prev = mg;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick }
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mc->mc_rotor = mg;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick}
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwickvoid
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwickmetaslab_group_passivate(metaslab_group_t *mg)
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick{
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick metaslab_class_t *mc = mg->mg_class;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick metaslab_group_t *mgprev, *mgnext;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(spa_config_held(mc->mc_spa, SCL_ALLOC, RW_WRITER));
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick if (--mg->mg_activation_count != 0) {
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mc->mc_rotor != mg);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mg->mg_prev == NULL);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mg->mg_next == NULL);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mg->mg_activation_count < 0);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick return;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick }
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mgprev = mg->mg_prev;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mgnext = mg->mg_next;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick if (mg == mgnext) {
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mc->mc_rotor = NULL;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick } else {
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mc->mc_rotor = mgnext;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mgprev->mg_next = mgnext;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mgnext->mg_prev = mgprev;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick }
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mg->mg_prev = NULL;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick mg->mg_next = NULL;
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick}
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickstatic void
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickmetaslab_group_add(metaslab_group_t *mg, metaslab_t *msp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&mg->mg_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(msp->ms_group == NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens msp->ms_group = mg;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick msp->ms_weight = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_add(&mg->mg_metaslab_tree, msp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&mg->mg_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_group_remove(metaslab_group_t *mg, metaslab_t *msp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&mg->mg_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(msp->ms_group == mg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_remove(&mg->mg_metaslab_tree, msp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens msp->ms_group = NULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&mg->mg_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickstatic void
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_group_sort(metaslab_group_t *mg, metaslab_t *msp, uint64_t weight)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens /*
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens * Although in principle the weight can be any value, in
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens * practice we do not use values in the range [1, 510].
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens */
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens ASSERT(weight >= SPA_MINBLOCKSIZE-1 || weight == 0);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ASSERT(MUTEX_HELD(&msp->ms_lock));
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&mg->mg_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(msp->ms_group == mg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_remove(&mg->mg_metaslab_tree, msp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens msp->ms_weight = weight;
fa9e4066f08beec538e775443c5be79dd423fcabahrens avl_add(&mg->mg_metaslab_tree, msp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&mg->mg_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson/*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * ==========================================================================
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Common allocator routines
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * ==========================================================================
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic int
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_segsize_compare(const void *x1, const void *x2)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson const space_seg_t *s1 = x1;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson const space_seg_t *s2 = x2;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t ss_size1 = s1->ss_end - s1->ss_start;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t ss_size2 = s2->ss_end - s2->ss_start;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (ss_size1 < ss_size2)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (-1);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (ss_size1 > ss_size2)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (1);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (s1->ss_start < s2->ss_start)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (-1);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (s1->ss_start > s2->ss_start)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (1);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (0);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson}
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick/*
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * This is a helper function that can be used by the allocator to find
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * a suitable block to allocate. This will search the specified AVL
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * tree looking for a block that matches the specified criteria.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickstatic uint64_t
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilsonmetaslab_block_picker(avl_tree_t *t, uint64_t *cursor, uint64_t size,
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson uint64_t align)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick{
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick space_seg_t *ss, ssearch;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick avl_index_t where;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ssearch.ss_start = *cursor;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ssearch.ss_end = *cursor + size;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ss = avl_find(t, &ssearch, &where);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick if (ss == NULL)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ss = avl_nearest(t, where, AVL_AFTER);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick while (ss != NULL) {
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick uint64_t offset = P2ROUNDUP(ss->ss_start, align);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick if (offset + size <= ss->ss_end) {
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick *cursor = offset + size;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick return (offset);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick }
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ss = AVL_NEXT(t, ss);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick }
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /*
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * If we know we've searched the whole map (*cursor == 0), give up.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * Otherwise, reset the cursor to the beginning and try again.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick if (*cursor == 0)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick return (-1ULL);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick *cursor = 0;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson return (metaslab_block_picker(t, cursor, size, align));
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson}
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilsonstatic void
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_pp_load(space_map_t *sm)
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson space_seg_t *ss;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson ASSERT(sm->sm_ppd == NULL);
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson sm->sm_ppd = kmem_zalloc(64 * sizeof (uint64_t), KM_SLEEP);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson sm->sm_pp_root = kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson avl_create(sm->sm_pp_root, metaslab_segsize_compare,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson sizeof (space_seg_t), offsetof(struct space_seg, ss_pp_node));
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson for (ss = avl_first(&sm->sm_root); ss; ss = AVL_NEXT(&sm->sm_root, ss))
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson avl_add(sm->sm_pp_root, ss);
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson}
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilsonstatic void
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_pp_unload(space_map_t *sm)
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson void *cookie = NULL;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson kmem_free(sm->sm_ppd, 64 * sizeof (uint64_t));
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson sm->sm_ppd = NULL;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson while (avl_destroy_nodes(sm->sm_pp_root, &cookie) != NULL) {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson /* tear down the tree */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson }
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson avl_destroy(sm->sm_pp_root);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson kmem_free(sm->sm_pp_root, sizeof (avl_tree_t));
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson sm->sm_pp_root = NULL;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick}
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick/* ARGSUSED */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickstatic void
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_pp_claim(space_map_t *sm, uint64_t start, uint64_t size)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick{
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /* No need to update cursor */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick}
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick/* ARGSUSED */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickstatic void
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_pp_free(space_map_t *sm, uint64_t start, uint64_t size)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick{
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /* No need to update cursor */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick}
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson/*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Return the maximum contiguous segment within the metaslab.
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson */
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilsonuint64_t
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_pp_maxsize(space_map_t *sm)
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson{
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson avl_tree_t *t = sm->sm_pp_root;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson space_seg_t *ss;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson if (t == NULL || (ss = avl_last(t)) == NULL)
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson return (0ULL);
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson return (ss->ss_end - ss->ss_start);
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson}
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson/*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * ==========================================================================
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * The first-fit block allocator
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * ==========================================================================
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic uint64_t
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_ff_alloc(space_map_t *sm, uint64_t size)
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson avl_tree_t *t = &sm->sm_root;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t align = size & -size;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t *cursor = (uint64_t *)sm->sm_ppd + highbit(align) - 1;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (metaslab_block_picker(t, cursor, size, align));
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson}
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson/* ARGSUSED */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonboolean_t
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_ff_fragmented(space_map_t *sm)
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (B_TRUE);
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson}
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic space_map_ops_t metaslab_ff_ops = {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_load,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_unload,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_ff_alloc,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_claim,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_free,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_maxsize,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_ff_fragmented
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson};
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson/*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * ==========================================================================
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Dynamic block allocator -
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Uses the first fit allocation scheme until space get low and then
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * adjusts to a best fit allocation method. Uses metaslab_df_alloc_threshold
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * and metaslab_df_free_pct to determine when to switch the allocation scheme.
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * ==========================================================================
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilsonstatic uint64_t
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilsonmetaslab_df_alloc(space_map_t *sm, uint64_t size)
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson{
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson avl_tree_t *t = &sm->sm_root;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson uint64_t align = size & -size;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson uint64_t *cursor = (uint64_t *)sm->sm_ppd + highbit(align) - 1;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t max_size = metaslab_pp_maxsize(sm);
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson int free_pct = sm->sm_space * 100 / sm->sm_size;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson ASSERT(MUTEX_HELD(sm->sm_lock));
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson ASSERT3U(avl_numnodes(&sm->sm_root), ==, avl_numnodes(sm->sm_pp_root));
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson if (max_size < size)
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson return (-1ULL);
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson /*
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * If we're running low on space switch to using the size
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson * sorted AVL tree (best-fit).
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson */
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson if (max_size < metaslab_df_alloc_threshold ||
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson free_pct < metaslab_df_free_pct) {
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson t = sm->sm_pp_root;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson *cursor = 0;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson }
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson return (metaslab_block_picker(t, cursor, size, 1ULL));
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson}
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic boolean_t
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_df_fragmented(space_map_t *sm)
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t max_size = metaslab_pp_maxsize(sm);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson int free_pct = sm->sm_space * 100 / sm->sm_size;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (max_size >= metaslab_df_alloc_threshold &&
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson free_pct >= metaslab_df_free_pct)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (B_FALSE);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (B_TRUE);
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson}
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilsonstatic space_map_ops_t metaslab_df_ops = {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_load,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_unload,
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson metaslab_df_alloc,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_claim,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_free,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_maxsize,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_df_fragmented
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson};
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson/*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * ==========================================================================
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Other experimental allocators
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * ==========================================================================
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic uint64_t
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_cdf_alloc(space_map_t *sm, uint64_t size)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson avl_tree_t *t = &sm->sm_root;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t *cursor = (uint64_t *)sm->sm_ppd;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t *extent_end = (uint64_t *)sm->sm_ppd + 1;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t max_size = metaslab_pp_maxsize(sm);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t rsize = size;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t offset = 0;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ASSERT(MUTEX_HELD(sm->sm_lock));
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ASSERT3U(avl_numnodes(&sm->sm_root), ==, avl_numnodes(sm->sm_pp_root));
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (max_size < size)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (-1ULL);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ASSERT3U(*extent_end, >=, *cursor);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson /*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * If we're running low on space switch to using the size
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * sorted AVL tree (best-fit).
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if ((*cursor + size) > *extent_end) {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson t = sm->sm_pp_root;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson *cursor = *extent_end = 0;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (max_size > 2 * SPA_MAXBLOCKSIZE)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson rsize = MIN(metaslab_min_alloc_size, max_size);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson offset = metaslab_block_picker(t, extent_end, rsize, 1ULL);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (offset != -1)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson *cursor = offset + size;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson } else {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson offset = metaslab_block_picker(t, cursor, rsize, 1ULL);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson }
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ASSERT3U(*cursor, <=, *extent_end);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (offset);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson}
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic boolean_t
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_cdf_fragmented(space_map_t *sm)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t max_size = metaslab_pp_maxsize(sm);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (max_size > (metaslab_min_alloc_size * 10))
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (B_FALSE);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (B_TRUE);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson}
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic space_map_ops_t metaslab_cdf_ops = {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_load,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_unload,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_cdf_alloc,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_claim,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_free,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_maxsize,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_cdf_fragmented
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson};
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
8d18220deb04ec7b12410cd90deb4d45e66d49bfMark J Musanteuint64_t metaslab_ndf_clump_shift = 4;
8d18220deb04ec7b12410cd90deb4d45e66d49bfMark J Musante
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic uint64_t
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_ndf_alloc(space_map_t *sm, uint64_t size)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson avl_tree_t *t = &sm->sm_root;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson avl_index_t where;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson space_seg_t *ss, ssearch;
8d18220deb04ec7b12410cd90deb4d45e66d49bfMark J Musante uint64_t hbit = highbit(size);
8d18220deb04ec7b12410cd90deb4d45e66d49bfMark J Musante uint64_t *cursor = (uint64_t *)sm->sm_ppd + hbit - 1;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t max_size = metaslab_pp_maxsize(sm);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ASSERT(MUTEX_HELD(sm->sm_lock));
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ASSERT3U(avl_numnodes(&sm->sm_root), ==, avl_numnodes(sm->sm_pp_root));
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (max_size < size)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (-1ULL);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ssearch.ss_start = *cursor;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ssearch.ss_end = *cursor + size;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ss = avl_find(t, &ssearch, &where);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (ss == NULL || (ss->ss_start + size > ss->ss_end)) {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson t = sm->sm_pp_root;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ssearch.ss_start = 0;
8d18220deb04ec7b12410cd90deb4d45e66d49bfMark J Musante ssearch.ss_end = MIN(max_size,
8d18220deb04ec7b12410cd90deb4d45e66d49bfMark J Musante 1ULL << (hbit + metaslab_ndf_clump_shift));
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ss = avl_find(t, &ssearch, &where);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (ss == NULL)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ss = avl_nearest(t, where, AVL_AFTER);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson ASSERT(ss != NULL);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson }
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (ss != NULL) {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (ss->ss_start + size <= ss->ss_end) {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson *cursor = ss->ss_start + size;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (ss->ss_start);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson }
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson }
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (-1ULL);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson}
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic boolean_t
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_ndf_fragmented(space_map_t *sm)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson uint64_t max_size = metaslab_pp_maxsize(sm);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
8d18220deb04ec7b12410cd90deb4d45e66d49bfMark J Musante if (max_size > (metaslab_min_alloc_size << metaslab_ndf_clump_shift))
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (B_FALSE);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (B_TRUE);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson}
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic space_map_ops_t metaslab_ndf_ops = {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_load,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_unload,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_ndf_alloc,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_claim,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_free,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_pp_maxsize,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_ndf_fragmented
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick};
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilsonspace_map_ops_t *zfs_metaslab_ops = &metaslab_df_ops;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ==========================================================================
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Metaslabs
fa9e4066f08beec538e775443c5be79dd423fcabahrens * ==========================================================================
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickmetaslab_t *
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickmetaslab_init(metaslab_group_t *mg, space_map_obj_t *smo,
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t start, uint64_t size, uint64_t txg)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_t *vd = mg->mg_vd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens metaslab_t *msp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens msp = kmem_zalloc(sizeof (metaslab_t), KM_SLEEP);
5ad820458efd0fdb914baff9c1447c22b819fa23nd mutex_init(&msp->ms_lock, NULL, MUTEX_DEFAULT, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick msp->ms_smo_syncing = *smo;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /*
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * We create the main space map here, but we don't create the
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * allocmaps and freemaps until metaslab_sync_done(). This serves
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * two purposes: it allows metaslab_sync_done() to detect the
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * addition of new space; and for debugging, it ensures that we'd
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * data fault on any attempt to use this metaslab before it's ready.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson msp->ms_map = kmem_zalloc(sizeof (space_map_t), KM_SLEEP);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_create(msp->ms_map, start, size,
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick vd->vdev_ashift, &msp->ms_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick metaslab_group_add(mg, msp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick if (metaslab_debug && smo->smo_object != 0) {
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick mutex_enter(&msp->ms_lock);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson VERIFY(space_map_load(msp->ms_map, mg->mg_class->mc_ops,
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick SM_FREE, smo, spa_meta_objset(vd->vdev_spa)) == 0);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick mutex_exit(&msp->ms_lock);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick }
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If we're opening an existing pool (txg == 0) or creating
fa9e4066f08beec538e775443c5be79dd423fcabahrens * a new one (txg == TXG_INITIAL), all space is available now.
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If we're adding space to an existing pool, the new space
fa9e4066f08beec538e775443c5be79dd423fcabahrens * does not become available until after this txg has synced.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick if (txg <= TXG_INITIAL)
fa9e4066f08beec538e775443c5be79dd423fcabahrens metaslab_sync_done(msp, 0);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick if (txg != 0) {
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick vdev_dirty(vd, 0, NULL, txg);
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley vdev_dirty(vd, VDD_METASLAB, msp, txg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick return (msp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_fini(metaslab_t *msp)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens metaslab_group_t *mg = msp->ms_group;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick vdev_space_update(mg->mg_vd,
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson -msp->ms_smo.smo_alloc, 0, -msp->ms_map->sm_size);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens metaslab_group_remove(mg, msp);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&msp->ms_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_unload(msp->ms_map);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_destroy(msp->ms_map);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson kmem_free(msp->ms_map, sizeof (*msp->ms_map));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley for (int t = 0; t < TXG_SIZE; t++) {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_destroy(msp->ms_allocmap[t]);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_destroy(msp->ms_freemap[t]);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson kmem_free(msp->ms_allocmap[t], sizeof (*msp->ms_allocmap[t]));
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson kmem_free(msp->ms_freemap[t], sizeof (*msp->ms_freemap[t]));
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson for (int t = 0; t < TXG_DEFER_SIZE; t++) {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_destroy(msp->ms_defermap[t]);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson kmem_free(msp->ms_defermap[t], sizeof (*msp->ms_defermap[t]));
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson }
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley
fb09f5aad449c97fe309678f3f604982b563a96fMadhav Suresh ASSERT0(msp->ms_deferspace);
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&msp->ms_lock);
5ad820458efd0fdb914baff9c1447c22b819fa23nd mutex_destroy(&msp->ms_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens kmem_free(msp, sizeof (metaslab_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm#define METASLAB_WEIGHT_PRIMARY (1ULL << 63)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm#define METASLAB_WEIGHT_SECONDARY (1ULL << 62)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm#define METASLAB_ACTIVE_MASK \
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm (METASLAB_WEIGHT_PRIMARY | METASLAB_WEIGHT_SECONDARY)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickstatic uint64_t
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickmetaslab_weight(metaslab_t *msp)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick{
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm metaslab_group_t *mg = msp->ms_group;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t *sm = msp->ms_map;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick space_map_obj_t *smo = &msp->ms_smo;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm vdev_t *vd = mg->mg_vd;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick uint64_t weight, space;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ASSERT(MUTEX_HELD(&msp->ms_lock));
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson /*
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson * This vdev is in the process of being removed so there is nothing
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson * for us to do here.
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson */
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson if (vd->vdev_removing) {
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson ASSERT0(smo->smo_alloc);
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson ASSERT0(vd->vdev_ms_shift);
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson return (0);
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson }
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /*
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * The baseline weight is the metaslab's free space.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick space = sm->sm_size - smo->smo_alloc;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick weight = space;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /*
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * Modern disks have uniform bit density and constant angular velocity.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * Therefore, the outer recording zones are faster (higher bandwidth)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * than the inner zones by the ratio of outer to inner track diameter,
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * which is typically around 2:1. We account for this by assigning
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * higher weight to lower metaslabs (multiplier ranging from 2x to 1x).
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * In effect, this means that we'll select the metaslab with the most
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * free bandwidth rather than simply the one with the most free space.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick weight = 2 * weight -
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ((sm->sm_start >> vd->vdev_ms_shift) * weight) / vd->vdev_ms_count;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ASSERT(weight >= space && weight <= 2 * space);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * For locality, assign higher weight to metaslabs which have
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * a lower offset than what we've already activated.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (sm->sm_start <= mg->mg_bonus_area)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson weight *= (metaslab_smo_bonus_pct / 100);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm ASSERT(weight >= space &&
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson weight <= 2 * (metaslab_smo_bonus_pct / 100) * space);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (sm->sm_loaded && !sm->sm_ops->smop_fragmented(sm)) {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson /*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * If this metaslab is one we're actively using, adjust its
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * weight to make it preferable to any inactive metaslab so
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * we'll polish it off.
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson weight |= (msp->ms_weight & METASLAB_ACTIVE_MASK);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson }
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson return (weight);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson}
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonstatic void
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_prefetch(metaslab_group_t *mg)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson spa_t *spa = mg->mg_vd->vdev_spa;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_t *msp;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson avl_tree_t *t = &mg->mg_metaslab_tree;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson int m;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson mutex_enter(&mg->mg_lock);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Prefetch the next potential metaslabs
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson for (msp = avl_first(t), m = 0; msp; msp = AVL_NEXT(t, msp), m++) {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t *sm = msp->ms_map;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson space_map_obj_t *smo = &msp->ms_smo;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson /* If we have reached our prefetch limit then we're done */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (m >= metaslab_prefetch_limit)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson break;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (!sm->sm_loaded && smo->smo_object != 0) {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson mutex_exit(&mg->mg_lock);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson dmu_prefetch(spa_meta_objset(spa), smo->smo_object,
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson 0ULL, smo->smo_objsize);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson mutex_enter(&mg->mg_lock);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson }
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson }
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson mutex_exit(&mg->mg_lock);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick}
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickstatic int
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilsonmetaslab_activate(metaslab_t *msp, uint64_t activation_weight)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_group_t *mg = msp->ms_group;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t *sm = msp->ms_map;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson space_map_ops_t *sm_ops = msp->ms_group->mg_class->mc_ops;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ASSERT(MUTEX_HELD(&msp->ms_lock));
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if ((msp->ms_weight & METASLAB_ACTIVE_MASK) == 0) {
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley space_map_load_wait(sm);
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley if (!sm->sm_loaded) {
01f55e48fb4d524eaf70687728aa51b7762e2e97George Wilson space_map_obj_t *smo = &msp->ms_smo;
01f55e48fb4d524eaf70687728aa51b7762e2e97George Wilson
01f55e48fb4d524eaf70687728aa51b7762e2e97George Wilson int error = space_map_load(sm, sm_ops, SM_FREE, smo,
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick spa_meta_objset(msp->ms_group->mg_vd->vdev_spa));
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (error) {
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley metaslab_group_sort(msp->ms_group, msp, 0);
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley return (error);
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley }
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley for (int t = 0; t < TXG_DEFER_SIZE; t++)
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_walk(msp->ms_defermap[t],
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley space_map_claim, sm);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson }
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson /*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Track the bonus area as we activate new metaslabs.
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson if (sm->sm_start > mg->mg_bonus_area) {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson mutex_enter(&mg->mg_lock);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson mg->mg_bonus_area = sm->sm_start;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson mutex_exit(&mg->mg_lock);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick }
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick metaslab_group_sort(msp->ms_group, msp,
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm msp->ms_weight | activation_weight);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick }
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ASSERT(sm->sm_loaded);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm ASSERT(msp->ms_weight & METASLAB_ACTIVE_MASK);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick return (0);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick}
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickstatic void
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwickmetaslab_passivate(metaslab_t *msp, uint64_t size)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick{
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens /*
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens * If size < SPA_MINBLOCKSIZE, then we will not allocate from
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens * this metaslab again. In that case, it had better be empty,
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens * or we would be leaving space on the table.
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT(size >= SPA_MINBLOCKSIZE || msp->ms_map->sm_space == 0);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm metaslab_group_sort(msp->ms_group, msp, MIN(msp->ms_weight, size));
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm ASSERT((msp->ms_weight & METASLAB_ACTIVE_MASK) == 0);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick}
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson/*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * Determine if the in-core space map representation can be condensed on-disk.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * We would like to use the following criteria to make our decision:
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson *
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * 1. The size of the space map object should not dramatically increase as a
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * result of writing out our in-core free map.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson *
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * 2. The minimal on-disk space map representation is zfs_condense_pct/100
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * times the size than the in-core representation (i.e. zfs_condense_pct = 110
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * and in-core = 1MB, minimal = 1.1.MB).
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson *
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * Checking the first condition is tricky since we don't want to walk
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * the entire AVL tree calculating the estimated on-disk size. Instead we
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * use the size-ordered AVL tree in the space map and calculate the
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * size required for the largest segment in our in-core free map. If the
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * size required to represent that segment on disk is larger than the space
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * map object then we avoid condensing this map.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson *
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * To determine the second criterion we use a best-case estimate and assume
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * each segment can be represented on-disk as a single 64-bit entry. We refer
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * to this best-case estimate as the space map's minimal form.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilsonstatic boolean_t
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilsonmetaslab_should_condense(metaslab_t *msp)
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson{
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t *sm = msp->ms_map;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_obj_t *smo = &msp->ms_smo_syncing;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_seg_t *ss;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson uint64_t size, entries, segsz;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT(MUTEX_HELD(&msp->ms_lock));
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT(sm->sm_loaded);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson /*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * Use the sm_pp_root AVL tree, which is ordered by size, to obtain
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * the largest segment in the in-core free map. If the tree is
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * empty then we should condense the map.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ss = avl_last(sm->sm_pp_root);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (ss == NULL)
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson return (B_TRUE);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson /*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * Calculate the number of 64-bit entries this segment would
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * require when written to disk. If this single segment would be
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * larger on-disk than the entire current on-disk structure, then
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * clearly condensing will increase the on-disk structure size.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson size = (ss->ss_end - ss->ss_start) >> sm->sm_shift;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson entries = size / (MIN(size, SM_RUN_MAX));
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson segsz = entries * sizeof (uint64_t);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson return (segsz <= smo->smo_objsize &&
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson smo->smo_objsize >= (zfs_condense_pct *
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson sizeof (uint64_t) * avl_numnodes(&sm->sm_root)) / 100);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson}
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson/*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * Condense the on-disk space map representation to its minimized form.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * The minimized form consists of a small number of allocations followed by
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * the in-core free map.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilsonstatic void
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilsonmetaslab_condense(metaslab_t *msp, uint64_t txg, dmu_tx_t *tx)
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson{
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson spa_t *spa = msp->ms_group->mg_vd->vdev_spa;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t *freemap = msp->ms_freemap[txg & TXG_MASK];
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t condense_map;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t *sm = msp->ms_map;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson objset_t *mos = spa_meta_objset(spa);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_obj_t *smo = &msp->ms_smo_syncing;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT(MUTEX_HELD(&msp->ms_lock));
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT3U(spa_sync_pass(spa), ==, 1);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT(sm->sm_loaded);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson spa_dbgmsg(spa, "condensing: txg %llu, msp[%llu] %p, "
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson "smo size %llu, segments %lu", txg,
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson (msp->ms_map->sm_start / msp->ms_map->sm_size), msp,
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson smo->smo_objsize, avl_numnodes(&sm->sm_root));
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson /*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * Create an map that is a 100% allocated map. We remove segments
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * that have been freed in this txg, any deferred frees that exist,
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * and any allocation in the future. Removing segments should be
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * a relatively inexpensive operation since we expect these maps to
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * a small number of nodes.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_create(&condense_map, sm->sm_start, sm->sm_size,
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson sm->sm_shift, sm->sm_lock);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_add(&condense_map, condense_map.sm_start,
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson condense_map.sm_size);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson /*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * Remove what's been freed in this txg from the condense_map.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * Since we're in sync_pass 1, we know that all the frees from
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * this txg are in the freemap.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_walk(freemap, space_map_remove, &condense_map);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson for (int t = 0; t < TXG_DEFER_SIZE; t++)
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_walk(msp->ms_defermap[t],
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_remove, &condense_map);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson for (int t = 1; t < TXG_CONCURRENT_STATES; t++)
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_walk(msp->ms_allocmap[(txg + t) & TXG_MASK],
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_remove, &condense_map);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson /*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * We're about to drop the metaslab's lock thus allowing
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * other consumers to change it's content. Set the
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * space_map's sm_condensing flag to ensure that
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * allocations on this metaslab do not occur while we're
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * in the middle of committing it to disk. This is only critical
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * for the ms_map as all other space_maps use per txg
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * views of their content.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson sm->sm_condensing = B_TRUE;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson mutex_exit(&msp->ms_lock);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_truncate(smo, mos, tx);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson mutex_enter(&msp->ms_lock);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson /*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * While we would ideally like to create a space_map representation
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * that consists only of allocation records, doing so can be
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * prohibitively expensive because the in-core free map can be
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * large, and therefore computationally expensive to subtract
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * from the condense_map. Instead we sync out two maps, a cheap
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * allocation only map followed by the in-core free map. While not
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * optimal, this is typically close to optimal, and much cheaper to
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * compute.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_sync(&condense_map, SM_ALLOC, smo, mos, tx);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_vacate(&condense_map, NULL, NULL);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_destroy(&condense_map);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_sync(sm, SM_FREE, smo, mos, tx);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson sm->sm_condensing = B_FALSE;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson spa_dbgmsg(spa, "condensed: txg %llu, msp[%llu] %p, "
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson "smo size %llu", txg,
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson (msp->ms_map->sm_start / msp->ms_map->sm_size), msp,
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson smo->smo_objsize);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson}
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Write a metaslab to disk in the context of the specified transaction group.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_sync(metaslab_t *msp, uint64_t txg)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_t *vd = msp->ms_group->mg_vd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens spa_t *spa = vd->vdev_spa;
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick objset_t *mos = spa_meta_objset(spa);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t *allocmap = msp->ms_allocmap[txg & TXG_MASK];
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t **freemap = &msp->ms_freemap[txg & TXG_MASK];
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t **freed_map = &msp->ms_freemap[TXG_CLEAN(txg) & TXG_MASK];
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t *sm = msp->ms_map;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick space_map_obj_t *smo = &msp->ms_smo_syncing;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_buf_t *db;
fa9e4066f08beec538e775443c5be79dd423fcabahrens dmu_tx_t *tx;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson ASSERT(!vd->vdev_ishole);
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson /*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * This metaslab has just been added so there's no work to do now.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (*freemap == NULL) {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT3P(allocmap, ==, NULL);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson return;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson }
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT3P(allocmap, !=, NULL);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT3P(*freemap, !=, NULL);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT3P(*freed_map, !=, NULL);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (allocmap->sm_space == 0 && (*freemap)->sm_space == 0)
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /*
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * The only state that can actually be changing concurrently with
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * metaslab_sync() is the metaslab's ms_map. No other thread can
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * be modifying this txg's allocmap, freemap, freed_map, or smo.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * Therefore, we only hold ms_lock to satify space_map ASSERTs.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * We drop it whenever we call into the DMU, because the DMU
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * can call down to us (e.g. via zio_free()) at any time.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley tx = dmu_tx_create_assigned(spa_get_dsl(spa), txg);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick if (smo->smo_object == 0) {
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ASSERT(smo->smo_objsize == 0);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ASSERT(smo->smo_alloc == 0);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick smo->smo_object = dmu_object_alloc(mos,
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick DMU_OT_SPACE_MAP, 1 << SPACE_MAP_BLOCKSHIFT,
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick DMU_OT_SPACE_MAP_HEADER, sizeof (*smo), tx);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick ASSERT(smo->smo_object != 0);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick dmu_write(mos, vd->vdev_ms_array, sizeof (uint64_t) *
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick (sm->sm_start >> vd->vdev_ms_shift),
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick sizeof (uint64_t), &smo->smo_object, tx);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley mutex_enter(&msp->ms_lock);
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (sm->sm_loaded && spa_sync_pass(spa) == 1 &&
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson metaslab_should_condense(msp)) {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson metaslab_condense(msp, txg, tx);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson } else {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_sync(allocmap, SM_ALLOC, smo, mos, tx);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_sync(*freemap, SM_FREE, smo, mos, tx);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson }
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_vacate(allocmap, NULL, NULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson /*
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * For sync pass 1, we avoid walking the entire space map and
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * instead will just swap the pointers for freemap and
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * freed_map. We can safely do this since the freed_map is
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * guaranteed to be empty on the initial pass.
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (spa_sync_pass(spa) == 1) {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT0((*freed_map)->sm_space);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT0(avl_numnodes(&(*freed_map)->sm_root));
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_swap(freemap, freed_map);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson } else {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_vacate(*freemap, space_map_add, *freed_map);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT0(msp->ms_allocmap[txg & TXG_MASK]->sm_space);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT0(msp->ms_freemap[txg & TXG_MASK]->sm_space);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&msp->ms_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson VERIFY0(dmu_bonus_hold(mos, smo->smo_object, FTAG, &db));
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick dmu_buf_will_dirty(db, tx);
1934e92fc930c49429ad71a8ca97340f33227e78maybee ASSERT3U(db->db_size, >=, sizeof (*smo));
1934e92fc930c49429ad71a8ca97340f33227e78maybee bcopy(smo, db->db_data, sizeof (*smo));
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick dmu_buf_rele(db, FTAG);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick dmu_tx_commit(tx);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Called after a transaction group has completely synced to mark
fa9e4066f08beec538e775443c5be79dd423fcabahrens * all of the metaslab's free space as usable.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
fa9e4066f08beec538e775443c5be79dd423fcabahrensvoid
fa9e4066f08beec538e775443c5be79dd423fcabahrensmetaslab_sync_done(metaslab_t *msp, uint64_t txg)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick space_map_obj_t *smo = &msp->ms_smo;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick space_map_obj_t *smosync = &msp->ms_smo_syncing;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_t *sm = msp->ms_map;
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson space_map_t **freed_map = &msp->ms_freemap[TXG_CLEAN(txg) & TXG_MASK];
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson space_map_t **defer_map = &msp->ms_defermap[txg % TXG_DEFER_SIZE];
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick metaslab_group_t *mg = msp->ms_group;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick vdev_t *vd = mg->mg_vd;
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley int64_t alloc_delta, defer_delta;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson ASSERT(!vd->vdev_ishole);
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&msp->ms_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /*
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * If this metaslab is just becoming available, initialize its
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson * allocmaps, freemaps, and defermap and add its capacity to the vdev.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson if (*freed_map == NULL) {
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson ASSERT(*defer_map == NULL);
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley for (int t = 0; t < TXG_SIZE; t++) {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson msp->ms_allocmap[t] = kmem_zalloc(sizeof (space_map_t),
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson KM_SLEEP);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_create(msp->ms_allocmap[t], sm->sm_start,
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick sm->sm_size, sm->sm_shift, sm->sm_lock);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson msp->ms_freemap[t] = kmem_zalloc(sizeof (space_map_t),
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson KM_SLEEP);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_create(msp->ms_freemap[t], sm->sm_start,
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick sm->sm_size, sm->sm_shift, sm->sm_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson for (int t = 0; t < TXG_DEFER_SIZE; t++) {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson msp->ms_defermap[t] = kmem_zalloc(sizeof (space_map_t),
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson KM_SLEEP);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_create(msp->ms_defermap[t], sm->sm_start,
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley sm->sm_size, sm->sm_shift, sm->sm_lock);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson }
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson freed_map = &msp->ms_freemap[TXG_CLEAN(txg) & TXG_MASK];
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson defer_map = &msp->ms_defermap[txg % TXG_DEFER_SIZE];
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick vdev_space_update(vd, 0, 0, sm->sm_size);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley alloc_delta = smosync->smo_alloc - smo->smo_alloc;
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson defer_delta = (*freed_map)->sm_space - (*defer_map)->sm_space;
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick vdev_space_update(vd, alloc_delta + defer_delta, defer_delta, 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT(msp->ms_allocmap[txg & TXG_MASK]->sm_space == 0);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson ASSERT(msp->ms_freemap[txg & TXG_MASK]->sm_space == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /*
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * If there's a space_map_load() in progress, wait for it to complete
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * so that we have a consistent view of the in-core space map.
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick space_map_load_wait(sm);
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson /*
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson * Move the frees from the defer_map to this map (if it's loaded).
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson * Swap the freed_map and the defer_map -- this is safe to do
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson * because we've just emptied out the defer_map.
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson */
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson space_map_vacate(*defer_map, sm->sm_loaded ? space_map_free : NULL, sm);
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson ASSERT0((*defer_map)->sm_space);
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson ASSERT0(avl_numnodes(&(*defer_map)->sm_root));
9eb57f7f3fbb970d4b9b89dcd5ecf543fe2414d5George Wilson space_map_swap(freed_map, defer_map);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick *smo = *smosync;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley msp->ms_deferspace += defer_delta;
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley ASSERT3S(msp->ms_deferspace, >=, 0);
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley ASSERT3S(msp->ms_deferspace, <=, sm->sm_size);
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley if (msp->ms_deferspace != 0) {
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley /*
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley * Keep syncing this metaslab until all deferred frees
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley * are back in circulation.
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley */
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley vdev_dirty(vd, VDD_METASLAB, msp, txg + 1);
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley }
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick /*
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * If the map is loaded but no longer active, evict it as soon as all
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * future allocations have synced. (If we unloaded it now and then
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick * loaded a moment later, the map wouldn't reflect those allocations.)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick */
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (sm->sm_loaded && (msp->ms_weight & METASLAB_ACTIVE_MASK) == 0) {
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick int evictable = 1;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
468c413a79615e77179e8d98f22a7e513a8135bdTim Haley for (int t = 1; t < TXG_CONCURRENT_STATES; t++)
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (msp->ms_allocmap[(txg + t) & TXG_MASK]->sm_space)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick evictable = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick if (evictable && !metaslab_debug)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick space_map_unload(sm);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick metaslab_group_sort(mg, msp, metaslab_weight(msp));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick mutex_exit(&msp->ms_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonvoid
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilsonmetaslab_sync_reassess(metaslab_group_t *mg)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson{
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson vdev_t *vd = mg->mg_vd;
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson int64_t failures = mg->mg_alloc_failures;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson /*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Re-evaluate all metaslabs which have lower offsets than the
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * bonus area.
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson for (int m = 0; m < vd->vdev_ms_count; m++) {
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_t *msp = vd->vdev_ms[m];
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (msp->ms_map->sm_start > mg->mg_bonus_area)
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson break;
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson mutex_enter(&msp->ms_lock);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_group_sort(mg, msp, metaslab_weight(msp));
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson mutex_exit(&msp->ms_lock);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson }
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson atomic_add_64(&mg->mg_alloc_failures, -failures);
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson /*
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson * Prefetch the next potential metaslabs
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson */
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson metaslab_prefetch(mg);
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson}
80eb36f241abf8c076119fb4c49a55fd61ebc710George Wilson
44cd46cadd9aab751dae6a4023c1cb5bf316d274billmstatic uint64_t
44cd46cadd9aab751dae6a4023c1cb5bf316d274billmmetaslab_distance(metaslab_t *msp, dva_t *dva)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm{
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm uint64_t ms_shift = msp->ms_group->mg_vd->vdev_ms_shift;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm uint64_t offset = DVA_GET_OFFSET(dva) >> ms_shift;
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson uint64_t start = msp->ms_map->sm_start >> ms_shift;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (msp->ms_group->mg_vd->vdev_id != DVA_GET_VDEV(dva))
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm return (1ULL << 63);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (offset < start)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm return ((start - offset) << ms_shift);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (offset > start)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm return ((offset - start) << ms_shift);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm return (0);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm}
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
44cd46cadd9aab751dae6a4023c1cb5bf316d274billmstatic uint64_t
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilsonmetaslab_group_alloc(metaslab_group_t *mg, uint64_t psize, uint64_t asize,
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson uint64_t txg, uint64_t min_distance, dva_t *dva, int d, int flags)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson spa_t *spa = mg->mg_vd->vdev_spa;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick metaslab_t *msp = NULL;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick uint64_t offset = -1ULL;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm avl_tree_t *t = &mg->mg_metaslab_tree;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm uint64_t activation_weight;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm uint64_t target_distance;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm int i;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm activation_weight = METASLAB_WEIGHT_PRIMARY;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson for (i = 0; i < d; i++) {
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson if (DVA_GET_VDEV(&dva[i]) == mg->mg_vd->vdev_id) {
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm activation_weight = METASLAB_WEIGHT_SECONDARY;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson break;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson }
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick for (;;) {
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson boolean_t was_active;
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick mutex_enter(&mg->mg_lock);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm for (msp = avl_first(t); msp; msp = AVL_NEXT(t, msp)) {
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson if (msp->ms_weight < asize) {
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson spa_dbgmsg(spa, "%s: failed to meet weight "
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson "requirement: vdev %llu, txg %llu, mg %p, "
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson "msp %p, psize %llu, asize %llu, "
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson "failures %llu, weight %llu",
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson spa_name(spa), mg->mg_vd->vdev_id, txg,
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson mg, msp, psize, asize,
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson mg->mg_alloc_failures, msp->ms_weight);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm mutex_exit(&mg->mg_lock);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm return (-1ULL);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm }
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson /*
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson * If the selected metaslab is condensing, skip it.
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson */
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson if (msp->ms_map->sm_condensing)
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson continue;
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson was_active = msp->ms_weight & METASLAB_ACTIVE_MASK;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (activation_weight == METASLAB_WEIGHT_PRIMARY)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm break;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm target_distance = min_distance +
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm (msp->ms_smo.smo_alloc ? 0 : min_distance >> 1);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm for (i = 0; i < d; i++)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (metaslab_distance(msp, &dva[i]) <
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm target_distance)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm break;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (i == d)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm break;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick }
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick mutex_exit(&mg->mg_lock);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (msp == NULL)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm return (-1ULL);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson /*
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * If we've already reached the allowable number of failed
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * allocation attempts on this metaslab group then we
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * consider skipping it. We skip it only if we're allowed
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * to "fast" gang, the physical size is larger than
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * a gang block, and we're attempting to allocate from
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * the primary metaslab.
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson */
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson if (mg->mg_alloc_failures > zfs_mg_alloc_failures &&
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson CAN_FASTGANG(flags) && psize > SPA_GANGBLOCKSIZE &&
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson activation_weight == METASLAB_WEIGHT_PRIMARY) {
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson spa_dbgmsg(spa, "%s: skipping metaslab group: "
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson "vdev %llu, txg %llu, mg %p, psize %llu, "
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson "asize %llu, failures %llu", spa_name(spa),
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson mg->mg_vd->vdev_id, txg, mg, psize, asize,
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson mg->mg_alloc_failures);
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson return (-1ULL);
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson }
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&msp->ms_lock);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
aeb1c1b609b02f03e8e7448beb88384ebc713525gw /*
aeb1c1b609b02f03e8e7448beb88384ebc713525gw * Ensure that the metaslab we have selected is still
aeb1c1b609b02f03e8e7448beb88384ebc713525gw * capable of handling our request. It's possible that
aeb1c1b609b02f03e8e7448beb88384ebc713525gw * another thread may have changed the weight while we
aeb1c1b609b02f03e8e7448beb88384ebc713525gw * were blocked on the metaslab lock.
aeb1c1b609b02f03e8e7448beb88384ebc713525gw */
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson if (msp->ms_weight < asize || (was_active &&
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson !(msp->ms_weight & METASLAB_ACTIVE_MASK) &&
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson activation_weight == METASLAB_WEIGHT_PRIMARY)) {
aeb1c1b609b02f03e8e7448beb88384ebc713525gw mutex_exit(&msp->ms_lock);
aeb1c1b609b02f03e8e7448beb88384ebc713525gw continue;
aeb1c1b609b02f03e8e7448beb88384ebc713525gw }
aeb1c1b609b02f03e8e7448beb88384ebc713525gw
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if ((msp->ms_weight & METASLAB_WEIGHT_SECONDARY) &&
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm activation_weight == METASLAB_WEIGHT_PRIMARY) {
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm metaslab_passivate(msp,
5f5f7a6f9c8e9c1587a54e690556d756ec67558cahrens msp->ms_weight & ~METASLAB_ACTIVE_MASK);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm mutex_exit(&msp->ms_lock);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm continue;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm }
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson if (metaslab_activate(msp, activation_weight) != 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&msp->ms_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens continue;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson /*
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson * If this metaslab is currently condensing then pick again as
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson * we can't manipulate this metaslab until it's committed
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson * to disk.
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson */
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson if (msp->ms_map->sm_condensing) {
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson mutex_exit(&msp->ms_lock);
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson continue;
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson }
03f8c366886542ed249a15d755ae78ea4e775d9dGeorge Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if ((offset = space_map_alloc(msp->ms_map, asize)) != -1ULL)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick break;
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson atomic_inc_64(&mg->mg_alloc_failures);
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson metaslab_passivate(msp, space_map_maxsize(msp->ms_map));
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&msp->ms_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (msp->ms_allocmap[txg & TXG_MASK]->sm_space == 0)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick vdev_dirty(mg->mg_vd, VDD_METASLAB, msp, txg);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_add(msp->ms_allocmap[txg & TXG_MASK], offset, asize);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick mutex_exit(&msp->ms_lock);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm return (offset);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Allocate a block for the specified i/o.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
44cd46cadd9aab751dae6a4023c1cb5bf316d274billmstatic int
8654d0253136055bd4cc2423d87378e8a37f2eb5perrinmetaslab_alloc_dva(spa_t *spa, metaslab_class_t *mc, uint64_t psize,
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick dva_t *dva, int d, dva_t *hintdva, uint64_t txg, int flags)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens metaslab_group_t *mg, *rotor;
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_t *vd;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm int dshift = 3;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm int all_zero;
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick int zio_lock = B_FALSE;
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick boolean_t allocatable;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t offset = -1ULL;
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t asize;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm uint64_t distance;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick ASSERT(!DVA_IS_VALID(&dva[d]));
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
e05725b117836db173257fae43fb0746eb857fb5bonwick /*
e05725b117836db173257fae43fb0746eb857fb5bonwick * For testing, make some blocks above a certain size be gang blocks.
e05725b117836db173257fae43fb0746eb857fb5bonwick */
d3d50737e566cade9a08d73d2af95105ac7cd960Rafael Vanoni if (psize >= metaslab_gang_bang && (ddi_get_lbolt() & 3) == 0)
e05725b117836db173257fae43fb0746eb857fb5bonwick return (ENOSPC);
e05725b117836db173257fae43fb0746eb857fb5bonwick
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Start at the rotor and loop through all mgs until we find something.
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick * Note that there's no locking on mc_rotor or mc_aliquot because
fa9e4066f08beec538e775443c5be79dd423fcabahrens * nothing actually breaks if we miss a few updates -- we just won't
fa9e4066f08beec538e775443c5be79dd423fcabahrens * allocate quite as evenly. It all balances out over time.
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm *
67bd71c6cc629bab3aa0d595c624a667f1574254perrin * If we are doing ditto or log blocks, try to spread them across
67bd71c6cc629bab3aa0d595c624a667f1574254perrin * consecutive vdevs. If we're forced to reuse a vdev before we've
67bd71c6cc629bab3aa0d595c624a667f1574254perrin * allocated all of our ditto blocks, then try and spread them out on
67bd71c6cc629bab3aa0d595c624a667f1574254perrin * that vdev as much as possible. If it turns out to not be possible,
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm * gradually lower our standards until anything becomes acceptable.
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm * Also, allocating on consecutive vdevs (as opposed to random vdevs)
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm * gives us hope of containing our fault domains to something we're
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm * able to reason about. Otherwise, any two top-level vdev failures
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm * will guarantee the loss of data. With consecutive allocation,
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm * only two adjacent top-level vdev failures will result in data loss.
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm *
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm * If we are doing gang blocks (hintdva is non-NULL), try to keep
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm * ourselves on the same vdev as our gang block header. That
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm * way, we can hope for locality in vdev_cache, plus it makes our
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm * fault domains something tractable.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (hintdva) {
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm vd = vdev_lookup_top(spa, DVA_GET_VDEV(&hintdva[d]));
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson /*
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson * It's possible the vdev we're using as the hint no
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson * longer exists (i.e. removed). Consult the rotor when
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson * all else fails.
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson */
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick if (vd != NULL) {
67bd71c6cc629bab3aa0d595c624a667f1574254perrin mg = vd->vdev_mg;
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson if (flags & METASLAB_HINTBP_AVOID &&
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson mg->mg_next != NULL)
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson mg = mg->mg_next;
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson } else {
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson mg = mc->mc_rotor;
88ecc943b4eb72f7c4fbbd8435997b85ef171fc3George Wilson }
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm } else if (d != 0) {
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm vd = vdev_lookup_top(spa, DVA_GET_VDEV(&dva[d - 1]));
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm mg = vd->vdev_mg->mg_next;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm } else {
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm mg = mc->mc_rotor;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm }
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
8654d0253136055bd4cc2423d87378e8a37f2eb5perrin /*
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick * If the hint put us into the wrong metaslab class, or into a
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick * metaslab group that has been passivated, just follow the rotor.
8654d0253136055bd4cc2423d87378e8a37f2eb5perrin */
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick if (mg->mg_class != mc || mg->mg_activation_count <= 0)
8654d0253136055bd4cc2423d87378e8a37f2eb5perrin mg = mc->mc_rotor;
8654d0253136055bd4cc2423d87378e8a37f2eb5perrin
8654d0253136055bd4cc2423d87378e8a37f2eb5perrin rotor = mg;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billmtop:
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm all_zero = B_TRUE;
fa9e4066f08beec538e775443c5be79dd423fcabahrens do {
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick ASSERT(mg->mg_activation_count == 1);
a15215608b8bd90f714f6db21ee623b584607cb6Jeff Bonwick
fa9e4066f08beec538e775443c5be79dd423fcabahrens vd = mg->mg_vd;
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick
0a4e9518a44f226be6d39383330b5b1792d2f184gw /*
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick * Don't allocate from faulted devices.
0a4e9518a44f226be6d39383330b5b1792d2f184gw */
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick if (zio_lock) {
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick spa_config_enter(spa, SCL_ZIO, FTAG, RW_READER);
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick allocatable = vdev_allocatable(vd);
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick spa_config_exit(spa, SCL_ZIO, FTAG);
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick } else {
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick allocatable = vdev_allocatable(vd);
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick }
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick if (!allocatable)
0a4e9518a44f226be6d39383330b5b1792d2f184gw goto next;
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick
0a4e9518a44f226be6d39383330b5b1792d2f184gw /*
0a4e9518a44f226be6d39383330b5b1792d2f184gw * Avoid writing single-copy data to a failing vdev
9dc3941c735ef88de46e850f745aa556d3a071a5Sašo Kiselkov * unless the user instructs us that it is okay.
0a4e9518a44f226be6d39383330b5b1792d2f184gw */
0a4e9518a44f226be6d39383330b5b1792d2f184gw if ((vd->vdev_stat.vs_write_errors > 0 ||
0a4e9518a44f226be6d39383330b5b1792d2f184gw vd->vdev_state < VDEV_STATE_HEALTHY) &&
9dc3941c735ef88de46e850f745aa556d3a071a5Sašo Kiselkov d == 0 && dshift == 3 &&
9dc3941c735ef88de46e850f745aa556d3a071a5Sašo Kiselkov !(zfs_write_to_degraded && vd->vdev_state ==
9dc3941c735ef88de46e850f745aa556d3a071a5Sašo Kiselkov VDEV_STATE_DEGRADED)) {
0a4e9518a44f226be6d39383330b5b1792d2f184gw all_zero = B_FALSE;
0a4e9518a44f226be6d39383330b5b1792d2f184gw goto next;
0a4e9518a44f226be6d39383330b5b1792d2f184gw }
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
8654d0253136055bd4cc2423d87378e8a37f2eb5perrin ASSERT(mg->mg_class == mc);
8654d0253136055bd4cc2423d87378e8a37f2eb5perrin
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm distance = vd->vdev_asize >> dshift;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (distance <= (1ULL << vd->vdev_ms_shift))
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm distance = 0;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm else
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm all_zero = B_FALSE;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
fa9e4066f08beec538e775443c5be79dd423fcabahrens asize = vdev_psize_to_asize(vd, psize);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(P2PHASE(asize, 1ULL << vd->vdev_ashift) == 0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson offset = metaslab_group_alloc(mg, psize, asize, txg, distance,
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson dva, d, flags);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (offset != -1ULL) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * If we've just selected this metaslab group,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * figure out whether the corresponding vdev is
fa9e4066f08beec538e775443c5be79dd423fcabahrens * over- or under-used relative to the pool,
fa9e4066f08beec538e775443c5be79dd423fcabahrens * and set an allocation bias to even it out.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick if (mc->mc_aliquot == 0) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_stat_t *vs = &vd->vdev_stat;
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick int64_t vu, cu;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson vu = (vs->vs_alloc * 100) / (vs->vs_space + 1);
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson cu = (mc->mc_alloc * 100) / (mc->mc_space + 1);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens /*
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * Calculate how much more or less we should
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * try to allocate from this device during
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * this iteration around the rotor.
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * For example, if a device is 80% full
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * and the pool is 20% full then we should
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * reduce allocations by 60% on this device.
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson *
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * mg_bias = (20 - 80) * 512K / 100 = -307K
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson *
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * This reduces allocations by 307K for this
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson * iteration.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick mg->mg_bias = ((cu - vu) *
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson (int64_t)mg->mg_aliquot) / 100;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick if (atomic_add_64_nv(&mc->mc_aliquot, asize) >=
fa9e4066f08beec538e775443c5be79dd423fcabahrens mg->mg_aliquot + mg->mg_bias) {
fa9e4066f08beec538e775443c5be79dd423fcabahrens mc->mc_rotor = mg->mg_next;
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick mc->mc_aliquot = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm DVA_SET_VDEV(&dva[d], vd->vdev_id);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm DVA_SET_OFFSET(&dva[d], offset);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick DVA_SET_GANG(&dva[d], !!(flags & METASLAB_GANG_HEADER));
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm DVA_SET_ASIZE(&dva[d], asize);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
0a4e9518a44f226be6d39383330b5b1792d2f184gwnext:
fa9e4066f08beec538e775443c5be79dd423fcabahrens mc->mc_rotor = mg->mg_next;
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick mc->mc_aliquot = 0;
fa9e4066f08beec538e775443c5be79dd423fcabahrens } while ((mg = mg->mg_next) != rotor);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm if (!all_zero) {
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm dshift++;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm ASSERT(dshift < 64);
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm goto top;
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm }
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm
d6e555bdd793b8bc8fe57d5f12c3d69c813d0661George Wilson if (!allocatable && !zio_lock) {
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick dshift = 3;
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick zio_lock = B_TRUE;
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick goto top;
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick }
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick
44cd46cadd9aab751dae6a4023c1cb5bf316d274billm bzero(&dva[d], sizeof (dva_t));
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens return (ENOSPC);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens/*
fa9e4066f08beec538e775443c5be79dd423fcabahrens * Free the block represented by DVA in the context of the specified
fa9e4066f08beec538e775443c5be79dd423fcabahrens * transaction group.
fa9e4066f08beec538e775443c5be79dd423fcabahrens */
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwickstatic void
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwickmetaslab_free_dva(spa_t *spa, const dva_t *dva, uint64_t txg, boolean_t now)
fa9e4066f08beec538e775443c5be79dd423fcabahrens{
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t vdev = DVA_GET_VDEV(dva);
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t offset = DVA_GET_OFFSET(dva);
fa9e4066f08beec538e775443c5be79dd423fcabahrens uint64_t size = DVA_GET_ASIZE(dva);
fa9e4066f08beec538e775443c5be79dd423fcabahrens vdev_t *vd;
fa9e4066f08beec538e775443c5be79dd423fcabahrens metaslab_t *msp;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick ASSERT(DVA_IS_VALID(dva));
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (txg > spa_freeze_txg(spa))
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick if ((vd = vdev_lookup_top(spa, vdev)) == NULL ||
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick (offset >> vd->vdev_ms_shift) >= vd->vdev_ms_count) {
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick cmn_err(CE_WARN, "metaslab_free_dva(): bad DVA %llu:%llu",
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick (u_longlong_t)vdev, (u_longlong_t)offset);
fa9e4066f08beec538e775443c5be79dd423fcabahrens ASSERT(0);
fa9e4066f08beec538e775443c5be79dd423fcabahrens return;
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens msp = vd->vdev_ms[offset >> vd->vdev_ms_shift];
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens if (DVA_GET_GANG(dva))
fa9e4066f08beec538e775443c5be79dd423fcabahrens size = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_enter(&msp->ms_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick if (now) {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_remove(msp->ms_allocmap[txg & TXG_MASK],
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick offset, size);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_free(msp->ms_map, offset, size);
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick } else {
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (msp->ms_freemap[txg & TXG_MASK]->sm_space == 0)
ecc2d604e885a75cc75e647b5641af99d5a6f4a6bonwick vdev_dirty(vd, VDD_METASLAB, msp, txg);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_add(msp->ms_freemap[txg & TXG_MASK], offset, size);
fa9e4066f08beec538e775443c5be79dd423fcabahrens }
fa9e4066f08beec538e775443c5be79dd423fcabahrens
fa9e4066f08beec538e775443c5be79dd423fcabahrens mutex_exit(&msp->ms_lock);
fa9e4066f08beec538e775443c5be79dd423fcabahrens}
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick/*
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick * Intent log support: upon opening the pool after a crash, notify the SPA
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick * of blocks that the intent log has allocated for immediate write, but
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick * which are still considered free by the SPA because the last transaction
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick * group didn't commit yet.
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick */
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwickstatic int
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwickmetaslab_claim_dva(spa_t *spa, const dva_t *dva, uint64_t txg)
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick{
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick uint64_t vdev = DVA_GET_VDEV(dva);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick uint64_t offset = DVA_GET_OFFSET(dva);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick uint64_t size = DVA_GET_ASIZE(dva);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick vdev_t *vd;
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick metaslab_t *msp;
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick int error = 0;
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick ASSERT(DVA_IS_VALID(dva));
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick if ((vd = vdev_lookup_top(spa, vdev)) == NULL ||
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick (offset >> vd->vdev_ms_shift) >= vd->vdev_ms_count)
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick return (ENXIO);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick msp = vd->vdev_ms[offset >> vd->vdev_ms_shift];
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick if (DVA_GET_GANG(dva))
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick size = vdev_psize_to_asize(vd, SPA_GANGBLOCKSIZE);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick mutex_enter(&msp->ms_lock);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if ((txg != 0 && spa_writeable(spa)) || !msp->ms_map->sm_loaded)
09c9d376e8ccb8fbba74f33cc268964464092b62George Wilson error = metaslab_activate(msp, METASLAB_WEIGHT_SECONDARY);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (error == 0 && !space_map_contains(msp->ms_map, offset, size))
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick error = ENOENT;
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick if (error || txg == 0) { /* txg == 0 indicates dry run */
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick mutex_exit(&msp->ms_lock);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick return (error);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick }
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_claim(msp->ms_map, offset, size);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
8ad4d6dd86f5bc65fb3afa566c8133f3bac21648Jeff Bonwick if (spa_writeable(spa)) { /* don't dirty if we're zdb(1M) */
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson if (msp->ms_allocmap[txg & TXG_MASK]->sm_space == 0)
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick vdev_dirty(vd, VDD_METASLAB, msp, txg);
16a4a8074274d2d7cc408589cf6359f4a378c861George Wilson space_map_add(msp->ms_allocmap[txg & TXG_MASK], offset, size);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick }
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick mutex_exit(&msp->ms_lock);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick return (0);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick}
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwickint
8654d0253136055bd4cc2423d87378e8a37f2eb5perrinmetaslab_alloc(spa_t *spa, metaslab_class_t *mc, uint64_t psize, blkptr_t *bp,
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick int ndvas, uint64_t txg, blkptr_t *hintbp, int flags)
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick{
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick dva_t *dva = bp->blk_dva;
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick dva_t *hintdva = hintbp->blk_dva;
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick int error = 0;
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick ASSERT(bp->blk_birth == 0);
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick ASSERT(BP_PHYSICAL_BIRTH(bp) == 0);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick spa_config_enter(spa, SCL_ALLOC, FTAG, RW_READER);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick if (mc->mc_rotor == NULL) { /* no vdevs in this class */
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick spa_config_exit(spa, SCL_ALLOC, FTAG);
8654d0253136055bd4cc2423d87378e8a37f2eb5perrin return (ENOSPC);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick }
8654d0253136055bd4cc2423d87378e8a37f2eb5perrin
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick ASSERT(ndvas > 0 && ndvas <= spa_max_replication(spa));
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick ASSERT(BP_GET_NDVAS(bp) == 0);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick ASSERT(hintbp == NULL || ndvas <= BP_GET_NDVAS(hintbp));
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick for (int d = 0; d < ndvas; d++) {
8654d0253136055bd4cc2423d87378e8a37f2eb5perrin error = metaslab_alloc_dva(spa, mc, psize, dva, d, hintdva,
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick txg, flags);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick if (error) {
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick for (d--; d >= 0; d--) {
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick metaslab_free_dva(spa, &dva[d], txg, B_TRUE);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick bzero(&dva[d], sizeof (dva_t));
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick }
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick spa_config_exit(spa, SCL_ALLOC, FTAG);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick return (error);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick }
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick }
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick ASSERT(error == 0);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick ASSERT(BP_GET_NDVAS(bp) == ndvas);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick spa_config_exit(spa, SCL_ALLOC, FTAG);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick BP_SET_BIRTH(bp, txg, txg);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick return (0);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick}
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwickvoid
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwickmetaslab_free(spa_t *spa, const blkptr_t *bp, uint64_t txg, boolean_t now)
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick{
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick const dva_t *dva = bp->blk_dva;
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick int ndvas = BP_GET_NDVAS(bp);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick ASSERT(!BP_IS_HOLE(bp));
b24ab6762772a3f6a89393947930c7fa61306783Jeff Bonwick ASSERT(!now || bp->blk_birth >= spa_syncing_txg(spa));
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick spa_config_enter(spa, SCL_FREE, FTAG, RW_READER);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick for (int d = 0; d < ndvas; d++)
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick metaslab_free_dva(spa, &dva[d], txg, now);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick spa_config_exit(spa, SCL_FREE, FTAG);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick}
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwickint
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwickmetaslab_claim(spa_t *spa, const blkptr_t *bp, uint64_t txg)
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick{
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick const dva_t *dva = bp->blk_dva;
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick int ndvas = BP_GET_NDVAS(bp);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick int error = 0;
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick ASSERT(!BP_IS_HOLE(bp));
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick if (txg != 0) {
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick /*
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick * First do a dry run to make sure all DVAs are claimable,
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick * so we don't have to unwind from partial failures below.
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick */
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick if ((error = metaslab_claim(spa, bp, 0)) != 0)
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick return (error);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick }
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick spa_config_enter(spa, SCL_ALLOC, FTAG, RW_READER);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick for (int d = 0; d < ndvas; d++)
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick if ((error = metaslab_claim_dva(spa, &dva[d], txg)) != 0)
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick break;
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick spa_config_exit(spa, SCL_ALLOC, FTAG);
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick ASSERT(error == 0 || txg == 0);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick
e14bb3258d05c1b1077e2db7cf77088924e56919Jeff Bonwick return (error);
d80c45e0f58fa434ba37259ea2e2b12e0380c19abonwick}