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400f56e3f8
Building module/zfs/dbuf.c for 32-bit targets can result in a warning:
In file included from
/usr/src/sys/contrib/openzfs/include/sys/zfs_context.h:97,
from /usr/src/sys/contrib/openzfs/module/zfs/dbuf.c:32:
/usr/src/sys/contrib/openzfs/module/zfs/dbuf.c: In function
'dmu_buf_will_clone':
/usr/src/sys/contrib/openzfs/lib/libspl/include/assert.h:116:33: error:
cast from pointer to integer of different size
[-Werror=pointer-to-int-cast]
116 | const uint64_t __left = (uint64_t)(LEFT);
\
| ^
/usr/src/sys/contrib/openzfs/lib/libspl/include/assert.h:148:25: note:
in expansion of macro 'VERIFY0'
148 | #define ASSERT0 VERIFY0
| ^~~~~~~
/usr/src/sys/contrib/openzfs/module/zfs/dbuf.c:2704:9: note: in
expansion of macro 'ASSERT0'
2704 | ASSERT0(dbuf_find_dirty_eq(db, tx->tx_txg));
| ^~~~~~~
This is because dbuf_find_dirty_eq() returns a pointer, which if
pointers are 32-bit results in a warning about the cast to uint64_t.
Instead, use the ASSERT3P() macro, with == and NULL as second and third
arguments, which should work regardless of the target's bitness.
Reviewed-by: Kay Pedersen <mail@mkwg.de>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Brian Atkinson <batkinson@lanl.gov>
Signed-off-by: Dimitry Andric <dimitry@andric.com>
Closes #15224
5194 lines
150 KiB
C
5194 lines
150 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
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* Copyright (c) 2012, 2020 by Delphix. All rights reserved.
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* Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
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* Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
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* Copyright (c) 2019, Klara Inc.
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* Copyright (c) 2019, Allan Jude
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* Copyright (c) 2021, 2022 by Pawel Jakub Dawidek
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*/
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#include <sys/zfs_context.h>
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#include <sys/arc.h>
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#include <sys/dmu.h>
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#include <sys/dmu_send.h>
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#include <sys/dmu_impl.h>
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#include <sys/dbuf.h>
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#include <sys/dmu_objset.h>
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#include <sys/dsl_dataset.h>
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#include <sys/dsl_dir.h>
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#include <sys/dmu_tx.h>
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#include <sys/spa.h>
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#include <sys/zio.h>
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#include <sys/dmu_zfetch.h>
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#include <sys/sa.h>
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#include <sys/sa_impl.h>
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#include <sys/zfeature.h>
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#include <sys/blkptr.h>
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#include <sys/range_tree.h>
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#include <sys/trace_zfs.h>
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#include <sys/callb.h>
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#include <sys/abd.h>
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#include <sys/brt.h>
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#include <sys/vdev.h>
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#include <cityhash.h>
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#include <sys/spa_impl.h>
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#include <sys/wmsum.h>
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#include <sys/vdev_impl.h>
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static kstat_t *dbuf_ksp;
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typedef struct dbuf_stats {
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/*
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* Various statistics about the size of the dbuf cache.
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*/
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kstat_named_t cache_count;
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kstat_named_t cache_size_bytes;
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kstat_named_t cache_size_bytes_max;
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/*
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* Statistics regarding the bounds on the dbuf cache size.
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*/
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kstat_named_t cache_target_bytes;
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kstat_named_t cache_lowater_bytes;
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kstat_named_t cache_hiwater_bytes;
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/*
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* Total number of dbuf cache evictions that have occurred.
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*/
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kstat_named_t cache_total_evicts;
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/*
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* The distribution of dbuf levels in the dbuf cache and
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* the total size of all dbufs at each level.
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*/
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kstat_named_t cache_levels[DN_MAX_LEVELS];
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kstat_named_t cache_levels_bytes[DN_MAX_LEVELS];
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/*
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* Statistics about the dbuf hash table.
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*/
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kstat_named_t hash_hits;
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kstat_named_t hash_misses;
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kstat_named_t hash_collisions;
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kstat_named_t hash_elements;
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kstat_named_t hash_elements_max;
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/*
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* Number of sublists containing more than one dbuf in the dbuf
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* hash table. Keep track of the longest hash chain.
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*/
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kstat_named_t hash_chains;
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kstat_named_t hash_chain_max;
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/*
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* Number of times a dbuf_create() discovers that a dbuf was
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* already created and in the dbuf hash table.
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*/
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kstat_named_t hash_insert_race;
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/*
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* Number of entries in the hash table dbuf and mutex arrays.
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*/
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kstat_named_t hash_table_count;
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kstat_named_t hash_mutex_count;
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/*
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* Statistics about the size of the metadata dbuf cache.
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*/
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kstat_named_t metadata_cache_count;
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kstat_named_t metadata_cache_size_bytes;
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kstat_named_t metadata_cache_size_bytes_max;
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/*
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* For diagnostic purposes, this is incremented whenever we can't add
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* something to the metadata cache because it's full, and instead put
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* the data in the regular dbuf cache.
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*/
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kstat_named_t metadata_cache_overflow;
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} dbuf_stats_t;
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dbuf_stats_t dbuf_stats = {
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{ "cache_count", KSTAT_DATA_UINT64 },
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{ "cache_size_bytes", KSTAT_DATA_UINT64 },
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{ "cache_size_bytes_max", KSTAT_DATA_UINT64 },
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{ "cache_target_bytes", KSTAT_DATA_UINT64 },
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{ "cache_lowater_bytes", KSTAT_DATA_UINT64 },
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{ "cache_hiwater_bytes", KSTAT_DATA_UINT64 },
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{ "cache_total_evicts", KSTAT_DATA_UINT64 },
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{ { "cache_levels_N", KSTAT_DATA_UINT64 } },
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{ { "cache_levels_bytes_N", KSTAT_DATA_UINT64 } },
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{ "hash_hits", KSTAT_DATA_UINT64 },
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{ "hash_misses", KSTAT_DATA_UINT64 },
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{ "hash_collisions", KSTAT_DATA_UINT64 },
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{ "hash_elements", KSTAT_DATA_UINT64 },
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{ "hash_elements_max", KSTAT_DATA_UINT64 },
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{ "hash_chains", KSTAT_DATA_UINT64 },
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{ "hash_chain_max", KSTAT_DATA_UINT64 },
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{ "hash_insert_race", KSTAT_DATA_UINT64 },
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{ "hash_table_count", KSTAT_DATA_UINT64 },
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{ "hash_mutex_count", KSTAT_DATA_UINT64 },
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{ "metadata_cache_count", KSTAT_DATA_UINT64 },
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{ "metadata_cache_size_bytes", KSTAT_DATA_UINT64 },
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{ "metadata_cache_size_bytes_max", KSTAT_DATA_UINT64 },
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{ "metadata_cache_overflow", KSTAT_DATA_UINT64 }
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};
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struct {
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wmsum_t cache_count;
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wmsum_t cache_total_evicts;
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wmsum_t cache_levels[DN_MAX_LEVELS];
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wmsum_t cache_levels_bytes[DN_MAX_LEVELS];
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wmsum_t hash_hits;
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wmsum_t hash_misses;
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wmsum_t hash_collisions;
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wmsum_t hash_chains;
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wmsum_t hash_insert_race;
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wmsum_t metadata_cache_count;
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wmsum_t metadata_cache_overflow;
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} dbuf_sums;
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#define DBUF_STAT_INCR(stat, val) \
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wmsum_add(&dbuf_sums.stat, val);
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#define DBUF_STAT_DECR(stat, val) \
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DBUF_STAT_INCR(stat, -(val));
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#define DBUF_STAT_BUMP(stat) \
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DBUF_STAT_INCR(stat, 1);
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#define DBUF_STAT_BUMPDOWN(stat) \
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DBUF_STAT_INCR(stat, -1);
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#define DBUF_STAT_MAX(stat, v) { \
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uint64_t _m; \
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while ((v) > (_m = dbuf_stats.stat.value.ui64) && \
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(_m != atomic_cas_64(&dbuf_stats.stat.value.ui64, _m, (v))))\
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continue; \
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}
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static void dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx);
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static void dbuf_sync_leaf_verify_bonus_dnode(dbuf_dirty_record_t *dr);
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static int dbuf_read_verify_dnode_crypt(dmu_buf_impl_t *db, uint32_t flags);
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/*
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* Global data structures and functions for the dbuf cache.
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*/
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static kmem_cache_t *dbuf_kmem_cache;
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static taskq_t *dbu_evict_taskq;
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static kthread_t *dbuf_cache_evict_thread;
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static kmutex_t dbuf_evict_lock;
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static kcondvar_t dbuf_evict_cv;
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static boolean_t dbuf_evict_thread_exit;
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/*
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* There are two dbuf caches; each dbuf can only be in one of them at a time.
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*
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* 1. Cache of metadata dbufs, to help make read-heavy administrative commands
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* from /sbin/zfs run faster. The "metadata cache" specifically stores dbufs
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* that represent the metadata that describes filesystems/snapshots/
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* bookmarks/properties/etc. We only evict from this cache when we export a
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* pool, to short-circuit as much I/O as possible for all administrative
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* commands that need the metadata. There is no eviction policy for this
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* cache, because we try to only include types in it which would occupy a
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* very small amount of space per object but create a large impact on the
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* performance of these commands. Instead, after it reaches a maximum size
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* (which should only happen on very small memory systems with a very large
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* number of filesystem objects), we stop taking new dbufs into the
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* metadata cache, instead putting them in the normal dbuf cache.
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*
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* 2. LRU cache of dbufs. The dbuf cache maintains a list of dbufs that
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* are not currently held but have been recently released. These dbufs
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* are not eligible for arc eviction until they are aged out of the cache.
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* Dbufs that are aged out of the cache will be immediately destroyed and
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* become eligible for arc eviction.
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*
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* Dbufs are added to these caches once the last hold is released. If a dbuf is
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* later accessed and still exists in the dbuf cache, then it will be removed
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* from the cache and later re-added to the head of the cache.
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*
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* If a given dbuf meets the requirements for the metadata cache, it will go
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* there, otherwise it will be considered for the generic LRU dbuf cache. The
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* caches and the refcounts tracking their sizes are stored in an array indexed
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* by those caches' matching enum values (from dbuf_cached_state_t).
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*/
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typedef struct dbuf_cache {
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multilist_t cache;
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zfs_refcount_t size ____cacheline_aligned;
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} dbuf_cache_t;
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dbuf_cache_t dbuf_caches[DB_CACHE_MAX];
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/* Size limits for the caches */
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static uint64_t dbuf_cache_max_bytes = UINT64_MAX;
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static uint64_t dbuf_metadata_cache_max_bytes = UINT64_MAX;
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/* Set the default sizes of the caches to log2 fraction of arc size */
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static uint_t dbuf_cache_shift = 5;
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static uint_t dbuf_metadata_cache_shift = 6;
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/* Set the dbuf hash mutex count as log2 shift (dynamic by default) */
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static uint_t dbuf_mutex_cache_shift = 0;
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static unsigned long dbuf_cache_target_bytes(void);
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static unsigned long dbuf_metadata_cache_target_bytes(void);
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/*
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* The LRU dbuf cache uses a three-stage eviction policy:
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* - A low water marker designates when the dbuf eviction thread
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* should stop evicting from the dbuf cache.
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* - When we reach the maximum size (aka mid water mark), we
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* signal the eviction thread to run.
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* - The high water mark indicates when the eviction thread
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* is unable to keep up with the incoming load and eviction must
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* happen in the context of the calling thread.
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*
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* The dbuf cache:
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* (max size)
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* low water mid water hi water
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* +----------------------------------------+----------+----------+
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* | | | |
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* | | | |
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* | | | |
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* | | | |
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* +----------------------------------------+----------+----------+
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* stop signal evict
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* evicting eviction directly
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* thread
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*
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* The high and low water marks indicate the operating range for the eviction
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* thread. The low water mark is, by default, 90% of the total size of the
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* cache and the high water mark is at 110% (both of these percentages can be
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* changed by setting dbuf_cache_lowater_pct and dbuf_cache_hiwater_pct,
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* respectively). The eviction thread will try to ensure that the cache remains
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* within this range by waking up every second and checking if the cache is
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* above the low water mark. The thread can also be woken up by callers adding
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* elements into the cache if the cache is larger than the mid water (i.e max
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* cache size). Once the eviction thread is woken up and eviction is required,
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* it will continue evicting buffers until it's able to reduce the cache size
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* to the low water mark. If the cache size continues to grow and hits the high
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* water mark, then callers adding elements to the cache will begin to evict
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* directly from the cache until the cache is no longer above the high water
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* mark.
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*/
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/*
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* The percentage above and below the maximum cache size.
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*/
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static uint_t dbuf_cache_hiwater_pct = 10;
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static uint_t dbuf_cache_lowater_pct = 10;
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static int
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dbuf_cons(void *vdb, void *unused, int kmflag)
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{
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(void) unused, (void) kmflag;
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dmu_buf_impl_t *db = vdb;
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memset(db, 0, sizeof (dmu_buf_impl_t));
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mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL);
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rw_init(&db->db_rwlock, NULL, RW_DEFAULT, NULL);
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cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL);
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multilist_link_init(&db->db_cache_link);
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zfs_refcount_create(&db->db_holds);
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return (0);
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}
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static void
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dbuf_dest(void *vdb, void *unused)
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{
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(void) unused;
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dmu_buf_impl_t *db = vdb;
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mutex_destroy(&db->db_mtx);
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rw_destroy(&db->db_rwlock);
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cv_destroy(&db->db_changed);
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ASSERT(!multilist_link_active(&db->db_cache_link));
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zfs_refcount_destroy(&db->db_holds);
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}
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/*
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* dbuf hash table routines
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*/
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static dbuf_hash_table_t dbuf_hash_table;
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/*
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* We use Cityhash for this. It's fast, and has good hash properties without
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* requiring any large static buffers.
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*/
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static uint64_t
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dbuf_hash(void *os, uint64_t obj, uint8_t lvl, uint64_t blkid)
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{
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return (cityhash4((uintptr_t)os, obj, (uint64_t)lvl, blkid));
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}
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#define DTRACE_SET_STATE(db, why) \
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DTRACE_PROBE2(dbuf__state_change, dmu_buf_impl_t *, db, \
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const char *, why)
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#define DBUF_EQUAL(dbuf, os, obj, level, blkid) \
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((dbuf)->db.db_object == (obj) && \
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(dbuf)->db_objset == (os) && \
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(dbuf)->db_level == (level) && \
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(dbuf)->db_blkid == (blkid))
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dmu_buf_impl_t *
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dbuf_find(objset_t *os, uint64_t obj, uint8_t level, uint64_t blkid,
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uint64_t *hash_out)
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{
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dbuf_hash_table_t *h = &dbuf_hash_table;
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uint64_t hv;
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uint64_t idx;
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dmu_buf_impl_t *db;
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hv = dbuf_hash(os, obj, level, blkid);
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idx = hv & h->hash_table_mask;
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mutex_enter(DBUF_HASH_MUTEX(h, idx));
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for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) {
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if (DBUF_EQUAL(db, os, obj, level, blkid)) {
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mutex_enter(&db->db_mtx);
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if (db->db_state != DB_EVICTING) {
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mutex_exit(DBUF_HASH_MUTEX(h, idx));
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return (db);
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}
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mutex_exit(&db->db_mtx);
|
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}
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}
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mutex_exit(DBUF_HASH_MUTEX(h, idx));
|
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if (hash_out != NULL)
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*hash_out = hv;
|
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return (NULL);
|
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}
|
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|
|
static dmu_buf_impl_t *
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dbuf_find_bonus(objset_t *os, uint64_t object)
|
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{
|
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dnode_t *dn;
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dmu_buf_impl_t *db = NULL;
|
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if (dnode_hold(os, object, FTAG, &dn) == 0) {
|
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rw_enter(&dn->dn_struct_rwlock, RW_READER);
|
|
if (dn->dn_bonus != NULL) {
|
|
db = dn->dn_bonus;
|
|
mutex_enter(&db->db_mtx);
|
|
}
|
|
rw_exit(&dn->dn_struct_rwlock);
|
|
dnode_rele(dn, FTAG);
|
|
}
|
|
return (db);
|
|
}
|
|
|
|
/*
|
|
* Insert an entry into the hash table. If there is already an element
|
|
* equal to elem in the hash table, then the already existing element
|
|
* will be returned and the new element will not be inserted.
|
|
* Otherwise returns NULL.
|
|
*/
|
|
static dmu_buf_impl_t *
|
|
dbuf_hash_insert(dmu_buf_impl_t *db)
|
|
{
|
|
dbuf_hash_table_t *h = &dbuf_hash_table;
|
|
objset_t *os = db->db_objset;
|
|
uint64_t obj = db->db.db_object;
|
|
int level = db->db_level;
|
|
uint64_t blkid, idx;
|
|
dmu_buf_impl_t *dbf;
|
|
uint32_t i;
|
|
|
|
blkid = db->db_blkid;
|
|
ASSERT3U(dbuf_hash(os, obj, level, blkid), ==, db->db_hash);
|
|
idx = db->db_hash & h->hash_table_mask;
|
|
|
|
mutex_enter(DBUF_HASH_MUTEX(h, idx));
|
|
for (dbf = h->hash_table[idx], i = 0; dbf != NULL;
|
|
dbf = dbf->db_hash_next, i++) {
|
|
if (DBUF_EQUAL(dbf, os, obj, level, blkid)) {
|
|
mutex_enter(&dbf->db_mtx);
|
|
if (dbf->db_state != DB_EVICTING) {
|
|
mutex_exit(DBUF_HASH_MUTEX(h, idx));
|
|
return (dbf);
|
|
}
|
|
mutex_exit(&dbf->db_mtx);
|
|
}
|
|
}
|
|
|
|
if (i > 0) {
|
|
DBUF_STAT_BUMP(hash_collisions);
|
|
if (i == 1)
|
|
DBUF_STAT_BUMP(hash_chains);
|
|
|
|
DBUF_STAT_MAX(hash_chain_max, i);
|
|
}
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
db->db_hash_next = h->hash_table[idx];
|
|
h->hash_table[idx] = db;
|
|
mutex_exit(DBUF_HASH_MUTEX(h, idx));
|
|
uint64_t he = atomic_inc_64_nv(&dbuf_stats.hash_elements.value.ui64);
|
|
DBUF_STAT_MAX(hash_elements_max, he);
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* This returns whether this dbuf should be stored in the metadata cache, which
|
|
* is based on whether it's from one of the dnode types that store data related
|
|
* to traversing dataset hierarchies.
|
|
*/
|
|
static boolean_t
|
|
dbuf_include_in_metadata_cache(dmu_buf_impl_t *db)
|
|
{
|
|
DB_DNODE_ENTER(db);
|
|
dmu_object_type_t type = DB_DNODE(db)->dn_type;
|
|
DB_DNODE_EXIT(db);
|
|
|
|
/* Check if this dbuf is one of the types we care about */
|
|
if (DMU_OT_IS_METADATA_CACHED(type)) {
|
|
/* If we hit this, then we set something up wrong in dmu_ot */
|
|
ASSERT(DMU_OT_IS_METADATA(type));
|
|
|
|
/*
|
|
* Sanity check for small-memory systems: don't allocate too
|
|
* much memory for this purpose.
|
|
*/
|
|
if (zfs_refcount_count(
|
|
&dbuf_caches[DB_DBUF_METADATA_CACHE].size) >
|
|
dbuf_metadata_cache_target_bytes()) {
|
|
DBUF_STAT_BUMP(metadata_cache_overflow);
|
|
return (B_FALSE);
|
|
}
|
|
|
|
return (B_TRUE);
|
|
}
|
|
|
|
return (B_FALSE);
|
|
}
|
|
|
|
/*
|
|
* Remove an entry from the hash table. It must be in the EVICTING state.
|
|
*/
|
|
static void
|
|
dbuf_hash_remove(dmu_buf_impl_t *db)
|
|
{
|
|
dbuf_hash_table_t *h = &dbuf_hash_table;
|
|
uint64_t idx;
|
|
dmu_buf_impl_t *dbf, **dbp;
|
|
|
|
ASSERT3U(dbuf_hash(db->db_objset, db->db.db_object, db->db_level,
|
|
db->db_blkid), ==, db->db_hash);
|
|
idx = db->db_hash & h->hash_table_mask;
|
|
|
|
/*
|
|
* We mustn't hold db_mtx to maintain lock ordering:
|
|
* DBUF_HASH_MUTEX > db_mtx.
|
|
*/
|
|
ASSERT(zfs_refcount_is_zero(&db->db_holds));
|
|
ASSERT(db->db_state == DB_EVICTING);
|
|
ASSERT(!MUTEX_HELD(&db->db_mtx));
|
|
|
|
mutex_enter(DBUF_HASH_MUTEX(h, idx));
|
|
dbp = &h->hash_table[idx];
|
|
while ((dbf = *dbp) != db) {
|
|
dbp = &dbf->db_hash_next;
|
|
ASSERT(dbf != NULL);
|
|
}
|
|
*dbp = db->db_hash_next;
|
|
db->db_hash_next = NULL;
|
|
if (h->hash_table[idx] &&
|
|
h->hash_table[idx]->db_hash_next == NULL)
|
|
DBUF_STAT_BUMPDOWN(hash_chains);
|
|
mutex_exit(DBUF_HASH_MUTEX(h, idx));
|
|
atomic_dec_64(&dbuf_stats.hash_elements.value.ui64);
|
|
}
|
|
|
|
typedef enum {
|
|
DBVU_EVICTING,
|
|
DBVU_NOT_EVICTING
|
|
} dbvu_verify_type_t;
|
|
|
|
static void
|
|
dbuf_verify_user(dmu_buf_impl_t *db, dbvu_verify_type_t verify_type)
|
|
{
|
|
#ifdef ZFS_DEBUG
|
|
int64_t holds;
|
|
|
|
if (db->db_user == NULL)
|
|
return;
|
|
|
|
/* Only data blocks support the attachment of user data. */
|
|
ASSERT(db->db_level == 0);
|
|
|
|
/* Clients must resolve a dbuf before attaching user data. */
|
|
ASSERT(db->db.db_data != NULL);
|
|
ASSERT3U(db->db_state, ==, DB_CACHED);
|
|
|
|
holds = zfs_refcount_count(&db->db_holds);
|
|
if (verify_type == DBVU_EVICTING) {
|
|
/*
|
|
* Immediate eviction occurs when holds == dirtycnt.
|
|
* For normal eviction buffers, holds is zero on
|
|
* eviction, except when dbuf_fix_old_data() calls
|
|
* dbuf_clear_data(). However, the hold count can grow
|
|
* during eviction even though db_mtx is held (see
|
|
* dmu_bonus_hold() for an example), so we can only
|
|
* test the generic invariant that holds >= dirtycnt.
|
|
*/
|
|
ASSERT3U(holds, >=, db->db_dirtycnt);
|
|
} else {
|
|
if (db->db_user_immediate_evict == TRUE)
|
|
ASSERT3U(holds, >=, db->db_dirtycnt);
|
|
else
|
|
ASSERT3U(holds, >, 0);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
dbuf_evict_user(dmu_buf_impl_t *db)
|
|
{
|
|
dmu_buf_user_t *dbu = db->db_user;
|
|
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
|
|
if (dbu == NULL)
|
|
return;
|
|
|
|
dbuf_verify_user(db, DBVU_EVICTING);
|
|
db->db_user = NULL;
|
|
|
|
#ifdef ZFS_DEBUG
|
|
if (dbu->dbu_clear_on_evict_dbufp != NULL)
|
|
*dbu->dbu_clear_on_evict_dbufp = NULL;
|
|
#endif
|
|
|
|
/*
|
|
* There are two eviction callbacks - one that we call synchronously
|
|
* and one that we invoke via a taskq. The async one is useful for
|
|
* avoiding lock order reversals and limiting stack depth.
|
|
*
|
|
* Note that if we have a sync callback but no async callback,
|
|
* it's likely that the sync callback will free the structure
|
|
* containing the dbu. In that case we need to take care to not
|
|
* dereference dbu after calling the sync evict func.
|
|
*/
|
|
boolean_t has_async = (dbu->dbu_evict_func_async != NULL);
|
|
|
|
if (dbu->dbu_evict_func_sync != NULL)
|
|
dbu->dbu_evict_func_sync(dbu);
|
|
|
|
if (has_async) {
|
|
taskq_dispatch_ent(dbu_evict_taskq, dbu->dbu_evict_func_async,
|
|
dbu, 0, &dbu->dbu_tqent);
|
|
}
|
|
}
|
|
|
|
boolean_t
|
|
dbuf_is_metadata(dmu_buf_impl_t *db)
|
|
{
|
|
/*
|
|
* Consider indirect blocks and spill blocks to be meta data.
|
|
*/
|
|
if (db->db_level > 0 || db->db_blkid == DMU_SPILL_BLKID) {
|
|
return (B_TRUE);
|
|
} else {
|
|
boolean_t is_metadata;
|
|
|
|
DB_DNODE_ENTER(db);
|
|
is_metadata = DMU_OT_IS_METADATA(DB_DNODE(db)->dn_type);
|
|
DB_DNODE_EXIT(db);
|
|
|
|
return (is_metadata);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We want to exclude buffers that are on a special allocation class from
|
|
* L2ARC.
|
|
*/
|
|
boolean_t
|
|
dbuf_is_l2cacheable(dmu_buf_impl_t *db)
|
|
{
|
|
if (db->db_objset->os_secondary_cache == ZFS_CACHE_ALL ||
|
|
(db->db_objset->os_secondary_cache ==
|
|
ZFS_CACHE_METADATA && dbuf_is_metadata(db))) {
|
|
if (l2arc_exclude_special == 0)
|
|
return (B_TRUE);
|
|
|
|
blkptr_t *bp = db->db_blkptr;
|
|
if (bp == NULL || BP_IS_HOLE(bp))
|
|
return (B_FALSE);
|
|
uint64_t vdev = DVA_GET_VDEV(bp->blk_dva);
|
|
vdev_t *rvd = db->db_objset->os_spa->spa_root_vdev;
|
|
vdev_t *vd = NULL;
|
|
|
|
if (vdev < rvd->vdev_children)
|
|
vd = rvd->vdev_child[vdev];
|
|
|
|
if (vd == NULL)
|
|
return (B_TRUE);
|
|
|
|
if (vd->vdev_alloc_bias != VDEV_BIAS_SPECIAL &&
|
|
vd->vdev_alloc_bias != VDEV_BIAS_DEDUP)
|
|
return (B_TRUE);
|
|
}
|
|
return (B_FALSE);
|
|
}
|
|
|
|
static inline boolean_t
|
|
dnode_level_is_l2cacheable(blkptr_t *bp, dnode_t *dn, int64_t level)
|
|
{
|
|
if (dn->dn_objset->os_secondary_cache == ZFS_CACHE_ALL ||
|
|
(dn->dn_objset->os_secondary_cache == ZFS_CACHE_METADATA &&
|
|
(level > 0 ||
|
|
DMU_OT_IS_METADATA(dn->dn_handle->dnh_dnode->dn_type)))) {
|
|
if (l2arc_exclude_special == 0)
|
|
return (B_TRUE);
|
|
|
|
if (bp == NULL || BP_IS_HOLE(bp))
|
|
return (B_FALSE);
|
|
uint64_t vdev = DVA_GET_VDEV(bp->blk_dva);
|
|
vdev_t *rvd = dn->dn_objset->os_spa->spa_root_vdev;
|
|
vdev_t *vd = NULL;
|
|
|
|
if (vdev < rvd->vdev_children)
|
|
vd = rvd->vdev_child[vdev];
|
|
|
|
if (vd == NULL)
|
|
return (B_TRUE);
|
|
|
|
if (vd->vdev_alloc_bias != VDEV_BIAS_SPECIAL &&
|
|
vd->vdev_alloc_bias != VDEV_BIAS_DEDUP)
|
|
return (B_TRUE);
|
|
}
|
|
return (B_FALSE);
|
|
}
|
|
|
|
|
|
/*
|
|
* This function *must* return indices evenly distributed between all
|
|
* sublists of the multilist. This is needed due to how the dbuf eviction
|
|
* code is laid out; dbuf_evict_thread() assumes dbufs are evenly
|
|
* distributed between all sublists and uses this assumption when
|
|
* deciding which sublist to evict from and how much to evict from it.
|
|
*/
|
|
static unsigned int
|
|
dbuf_cache_multilist_index_func(multilist_t *ml, void *obj)
|
|
{
|
|
dmu_buf_impl_t *db = obj;
|
|
|
|
/*
|
|
* The assumption here, is the hash value for a given
|
|
* dmu_buf_impl_t will remain constant throughout it's lifetime
|
|
* (i.e. it's objset, object, level and blkid fields don't change).
|
|
* Thus, we don't need to store the dbuf's sublist index
|
|
* on insertion, as this index can be recalculated on removal.
|
|
*
|
|
* Also, the low order bits of the hash value are thought to be
|
|
* distributed evenly. Otherwise, in the case that the multilist
|
|
* has a power of two number of sublists, each sublists' usage
|
|
* would not be evenly distributed. In this context full 64bit
|
|
* division would be a waste of time, so limit it to 32 bits.
|
|
*/
|
|
return ((unsigned int)dbuf_hash(db->db_objset, db->db.db_object,
|
|
db->db_level, db->db_blkid) %
|
|
multilist_get_num_sublists(ml));
|
|
}
|
|
|
|
/*
|
|
* The target size of the dbuf cache can grow with the ARC target,
|
|
* unless limited by the tunable dbuf_cache_max_bytes.
|
|
*/
|
|
static inline unsigned long
|
|
dbuf_cache_target_bytes(void)
|
|
{
|
|
return (MIN(dbuf_cache_max_bytes,
|
|
arc_target_bytes() >> dbuf_cache_shift));
|
|
}
|
|
|
|
/*
|
|
* The target size of the dbuf metadata cache can grow with the ARC target,
|
|
* unless limited by the tunable dbuf_metadata_cache_max_bytes.
|
|
*/
|
|
static inline unsigned long
|
|
dbuf_metadata_cache_target_bytes(void)
|
|
{
|
|
return (MIN(dbuf_metadata_cache_max_bytes,
|
|
arc_target_bytes() >> dbuf_metadata_cache_shift));
|
|
}
|
|
|
|
static inline uint64_t
|
|
dbuf_cache_hiwater_bytes(void)
|
|
{
|
|
uint64_t dbuf_cache_target = dbuf_cache_target_bytes();
|
|
return (dbuf_cache_target +
|
|
(dbuf_cache_target * dbuf_cache_hiwater_pct) / 100);
|
|
}
|
|
|
|
static inline uint64_t
|
|
dbuf_cache_lowater_bytes(void)
|
|
{
|
|
uint64_t dbuf_cache_target = dbuf_cache_target_bytes();
|
|
return (dbuf_cache_target -
|
|
(dbuf_cache_target * dbuf_cache_lowater_pct) / 100);
|
|
}
|
|
|
|
static inline boolean_t
|
|
dbuf_cache_above_lowater(void)
|
|
{
|
|
return (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) >
|
|
dbuf_cache_lowater_bytes());
|
|
}
|
|
|
|
/*
|
|
* Evict the oldest eligible dbuf from the dbuf cache.
|
|
*/
|
|
static void
|
|
dbuf_evict_one(void)
|
|
{
|
|
int idx = multilist_get_random_index(&dbuf_caches[DB_DBUF_CACHE].cache);
|
|
multilist_sublist_t *mls = multilist_sublist_lock(
|
|
&dbuf_caches[DB_DBUF_CACHE].cache, idx);
|
|
|
|
ASSERT(!MUTEX_HELD(&dbuf_evict_lock));
|
|
|
|
dmu_buf_impl_t *db = multilist_sublist_tail(mls);
|
|
while (db != NULL && mutex_tryenter(&db->db_mtx) == 0) {
|
|
db = multilist_sublist_prev(mls, db);
|
|
}
|
|
|
|
DTRACE_PROBE2(dbuf__evict__one, dmu_buf_impl_t *, db,
|
|
multilist_sublist_t *, mls);
|
|
|
|
if (db != NULL) {
|
|
multilist_sublist_remove(mls, db);
|
|
multilist_sublist_unlock(mls);
|
|
(void) zfs_refcount_remove_many(
|
|
&dbuf_caches[DB_DBUF_CACHE].size, db->db.db_size, db);
|
|
DBUF_STAT_BUMPDOWN(cache_levels[db->db_level]);
|
|
DBUF_STAT_BUMPDOWN(cache_count);
|
|
DBUF_STAT_DECR(cache_levels_bytes[db->db_level],
|
|
db->db.db_size);
|
|
ASSERT3U(db->db_caching_status, ==, DB_DBUF_CACHE);
|
|
db->db_caching_status = DB_NO_CACHE;
|
|
dbuf_destroy(db);
|
|
DBUF_STAT_BUMP(cache_total_evicts);
|
|
} else {
|
|
multilist_sublist_unlock(mls);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The dbuf evict thread is responsible for aging out dbufs from the
|
|
* cache. Once the cache has reached it's maximum size, dbufs are removed
|
|
* and destroyed. The eviction thread will continue running until the size
|
|
* of the dbuf cache is at or below the maximum size. Once the dbuf is aged
|
|
* out of the cache it is destroyed and becomes eligible for arc eviction.
|
|
*/
|
|
static __attribute__((noreturn)) void
|
|
dbuf_evict_thread(void *unused)
|
|
{
|
|
(void) unused;
|
|
callb_cpr_t cpr;
|
|
|
|
CALLB_CPR_INIT(&cpr, &dbuf_evict_lock, callb_generic_cpr, FTAG);
|
|
|
|
mutex_enter(&dbuf_evict_lock);
|
|
while (!dbuf_evict_thread_exit) {
|
|
while (!dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) {
|
|
CALLB_CPR_SAFE_BEGIN(&cpr);
|
|
(void) cv_timedwait_idle_hires(&dbuf_evict_cv,
|
|
&dbuf_evict_lock, SEC2NSEC(1), MSEC2NSEC(1), 0);
|
|
CALLB_CPR_SAFE_END(&cpr, &dbuf_evict_lock);
|
|
}
|
|
mutex_exit(&dbuf_evict_lock);
|
|
|
|
/*
|
|
* Keep evicting as long as we're above the low water mark
|
|
* for the cache. We do this without holding the locks to
|
|
* minimize lock contention.
|
|
*/
|
|
while (dbuf_cache_above_lowater() && !dbuf_evict_thread_exit) {
|
|
dbuf_evict_one();
|
|
}
|
|
|
|
mutex_enter(&dbuf_evict_lock);
|
|
}
|
|
|
|
dbuf_evict_thread_exit = B_FALSE;
|
|
cv_broadcast(&dbuf_evict_cv);
|
|
CALLB_CPR_EXIT(&cpr); /* drops dbuf_evict_lock */
|
|
thread_exit();
|
|
}
|
|
|
|
/*
|
|
* Wake up the dbuf eviction thread if the dbuf cache is at its max size.
|
|
* If the dbuf cache is at its high water mark, then evict a dbuf from the
|
|
* dbuf cache using the caller's context.
|
|
*/
|
|
static void
|
|
dbuf_evict_notify(uint64_t size)
|
|
{
|
|
/*
|
|
* We check if we should evict without holding the dbuf_evict_lock,
|
|
* because it's OK to occasionally make the wrong decision here,
|
|
* and grabbing the lock results in massive lock contention.
|
|
*/
|
|
if (size > dbuf_cache_target_bytes()) {
|
|
if (size > dbuf_cache_hiwater_bytes())
|
|
dbuf_evict_one();
|
|
cv_signal(&dbuf_evict_cv);
|
|
}
|
|
}
|
|
|
|
static int
|
|
dbuf_kstat_update(kstat_t *ksp, int rw)
|
|
{
|
|
dbuf_stats_t *ds = ksp->ks_data;
|
|
dbuf_hash_table_t *h = &dbuf_hash_table;
|
|
|
|
if (rw == KSTAT_WRITE)
|
|
return (SET_ERROR(EACCES));
|
|
|
|
ds->cache_count.value.ui64 =
|
|
wmsum_value(&dbuf_sums.cache_count);
|
|
ds->cache_size_bytes.value.ui64 =
|
|
zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size);
|
|
ds->cache_target_bytes.value.ui64 = dbuf_cache_target_bytes();
|
|
ds->cache_hiwater_bytes.value.ui64 = dbuf_cache_hiwater_bytes();
|
|
ds->cache_lowater_bytes.value.ui64 = dbuf_cache_lowater_bytes();
|
|
ds->cache_total_evicts.value.ui64 =
|
|
wmsum_value(&dbuf_sums.cache_total_evicts);
|
|
for (int i = 0; i < DN_MAX_LEVELS; i++) {
|
|
ds->cache_levels[i].value.ui64 =
|
|
wmsum_value(&dbuf_sums.cache_levels[i]);
|
|
ds->cache_levels_bytes[i].value.ui64 =
|
|
wmsum_value(&dbuf_sums.cache_levels_bytes[i]);
|
|
}
|
|
ds->hash_hits.value.ui64 =
|
|
wmsum_value(&dbuf_sums.hash_hits);
|
|
ds->hash_misses.value.ui64 =
|
|
wmsum_value(&dbuf_sums.hash_misses);
|
|
ds->hash_collisions.value.ui64 =
|
|
wmsum_value(&dbuf_sums.hash_collisions);
|
|
ds->hash_chains.value.ui64 =
|
|
wmsum_value(&dbuf_sums.hash_chains);
|
|
ds->hash_insert_race.value.ui64 =
|
|
wmsum_value(&dbuf_sums.hash_insert_race);
|
|
ds->hash_table_count.value.ui64 = h->hash_table_mask + 1;
|
|
ds->hash_mutex_count.value.ui64 = h->hash_mutex_mask + 1;
|
|
ds->metadata_cache_count.value.ui64 =
|
|
wmsum_value(&dbuf_sums.metadata_cache_count);
|
|
ds->metadata_cache_size_bytes.value.ui64 = zfs_refcount_count(
|
|
&dbuf_caches[DB_DBUF_METADATA_CACHE].size);
|
|
ds->metadata_cache_overflow.value.ui64 =
|
|
wmsum_value(&dbuf_sums.metadata_cache_overflow);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
dbuf_init(void)
|
|
{
|
|
uint64_t hmsize, hsize = 1ULL << 16;
|
|
dbuf_hash_table_t *h = &dbuf_hash_table;
|
|
|
|
/*
|
|
* The hash table is big enough to fill one eighth of physical memory
|
|
* with an average block size of zfs_arc_average_blocksize (default 8K).
|
|
* By default, the table will take up
|
|
* totalmem * sizeof(void*) / 8K (1MB per GB with 8-byte pointers).
|
|
*/
|
|
while (hsize * zfs_arc_average_blocksize < arc_all_memory() / 8)
|
|
hsize <<= 1;
|
|
|
|
h->hash_table = NULL;
|
|
while (h->hash_table == NULL) {
|
|
h->hash_table_mask = hsize - 1;
|
|
|
|
h->hash_table = vmem_zalloc(hsize * sizeof (void *), KM_SLEEP);
|
|
if (h->hash_table == NULL)
|
|
hsize >>= 1;
|
|
|
|
ASSERT3U(hsize, >=, 1ULL << 10);
|
|
}
|
|
|
|
/*
|
|
* The hash table buckets are protected by an array of mutexes where
|
|
* each mutex is reponsible for protecting 128 buckets. A minimum
|
|
* array size of 8192 is targeted to avoid contention.
|
|
*/
|
|
if (dbuf_mutex_cache_shift == 0)
|
|
hmsize = MAX(hsize >> 7, 1ULL << 13);
|
|
else
|
|
hmsize = 1ULL << MIN(dbuf_mutex_cache_shift, 24);
|
|
|
|
h->hash_mutexes = NULL;
|
|
while (h->hash_mutexes == NULL) {
|
|
h->hash_mutex_mask = hmsize - 1;
|
|
|
|
h->hash_mutexes = vmem_zalloc(hmsize * sizeof (kmutex_t),
|
|
KM_SLEEP);
|
|
if (h->hash_mutexes == NULL)
|
|
hmsize >>= 1;
|
|
}
|
|
|
|
dbuf_kmem_cache = kmem_cache_create("dmu_buf_impl_t",
|
|
sizeof (dmu_buf_impl_t),
|
|
0, dbuf_cons, dbuf_dest, NULL, NULL, NULL, 0);
|
|
|
|
for (int i = 0; i < hmsize; i++)
|
|
mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL);
|
|
|
|
dbuf_stats_init(h);
|
|
|
|
/*
|
|
* All entries are queued via taskq_dispatch_ent(), so min/maxalloc
|
|
* configuration is not required.
|
|
*/
|
|
dbu_evict_taskq = taskq_create("dbu_evict", 1, defclsyspri, 0, 0, 0);
|
|
|
|
for (dbuf_cached_state_t dcs = 0; dcs < DB_CACHE_MAX; dcs++) {
|
|
multilist_create(&dbuf_caches[dcs].cache,
|
|
sizeof (dmu_buf_impl_t),
|
|
offsetof(dmu_buf_impl_t, db_cache_link),
|
|
dbuf_cache_multilist_index_func);
|
|
zfs_refcount_create(&dbuf_caches[dcs].size);
|
|
}
|
|
|
|
dbuf_evict_thread_exit = B_FALSE;
|
|
mutex_init(&dbuf_evict_lock, NULL, MUTEX_DEFAULT, NULL);
|
|
cv_init(&dbuf_evict_cv, NULL, CV_DEFAULT, NULL);
|
|
dbuf_cache_evict_thread = thread_create(NULL, 0, dbuf_evict_thread,
|
|
NULL, 0, &p0, TS_RUN, minclsyspri);
|
|
|
|
wmsum_init(&dbuf_sums.cache_count, 0);
|
|
wmsum_init(&dbuf_sums.cache_total_evicts, 0);
|
|
for (int i = 0; i < DN_MAX_LEVELS; i++) {
|
|
wmsum_init(&dbuf_sums.cache_levels[i], 0);
|
|
wmsum_init(&dbuf_sums.cache_levels_bytes[i], 0);
|
|
}
|
|
wmsum_init(&dbuf_sums.hash_hits, 0);
|
|
wmsum_init(&dbuf_sums.hash_misses, 0);
|
|
wmsum_init(&dbuf_sums.hash_collisions, 0);
|
|
wmsum_init(&dbuf_sums.hash_chains, 0);
|
|
wmsum_init(&dbuf_sums.hash_insert_race, 0);
|
|
wmsum_init(&dbuf_sums.metadata_cache_count, 0);
|
|
wmsum_init(&dbuf_sums.metadata_cache_overflow, 0);
|
|
|
|
dbuf_ksp = kstat_create("zfs", 0, "dbufstats", "misc",
|
|
KSTAT_TYPE_NAMED, sizeof (dbuf_stats) / sizeof (kstat_named_t),
|
|
KSTAT_FLAG_VIRTUAL);
|
|
if (dbuf_ksp != NULL) {
|
|
for (int i = 0; i < DN_MAX_LEVELS; i++) {
|
|
snprintf(dbuf_stats.cache_levels[i].name,
|
|
KSTAT_STRLEN, "cache_level_%d", i);
|
|
dbuf_stats.cache_levels[i].data_type =
|
|
KSTAT_DATA_UINT64;
|
|
snprintf(dbuf_stats.cache_levels_bytes[i].name,
|
|
KSTAT_STRLEN, "cache_level_%d_bytes", i);
|
|
dbuf_stats.cache_levels_bytes[i].data_type =
|
|
KSTAT_DATA_UINT64;
|
|
}
|
|
dbuf_ksp->ks_data = &dbuf_stats;
|
|
dbuf_ksp->ks_update = dbuf_kstat_update;
|
|
kstat_install(dbuf_ksp);
|
|
}
|
|
}
|
|
|
|
void
|
|
dbuf_fini(void)
|
|
{
|
|
dbuf_hash_table_t *h = &dbuf_hash_table;
|
|
|
|
dbuf_stats_destroy();
|
|
|
|
for (int i = 0; i < (h->hash_mutex_mask + 1); i++)
|
|
mutex_destroy(&h->hash_mutexes[i]);
|
|
|
|
vmem_free(h->hash_table, (h->hash_table_mask + 1) * sizeof (void *));
|
|
vmem_free(h->hash_mutexes, (h->hash_mutex_mask + 1) *
|
|
sizeof (kmutex_t));
|
|
|
|
kmem_cache_destroy(dbuf_kmem_cache);
|
|
taskq_destroy(dbu_evict_taskq);
|
|
|
|
mutex_enter(&dbuf_evict_lock);
|
|
dbuf_evict_thread_exit = B_TRUE;
|
|
while (dbuf_evict_thread_exit) {
|
|
cv_signal(&dbuf_evict_cv);
|
|
cv_wait(&dbuf_evict_cv, &dbuf_evict_lock);
|
|
}
|
|
mutex_exit(&dbuf_evict_lock);
|
|
|
|
mutex_destroy(&dbuf_evict_lock);
|
|
cv_destroy(&dbuf_evict_cv);
|
|
|
|
for (dbuf_cached_state_t dcs = 0; dcs < DB_CACHE_MAX; dcs++) {
|
|
zfs_refcount_destroy(&dbuf_caches[dcs].size);
|
|
multilist_destroy(&dbuf_caches[dcs].cache);
|
|
}
|
|
|
|
if (dbuf_ksp != NULL) {
|
|
kstat_delete(dbuf_ksp);
|
|
dbuf_ksp = NULL;
|
|
}
|
|
|
|
wmsum_fini(&dbuf_sums.cache_count);
|
|
wmsum_fini(&dbuf_sums.cache_total_evicts);
|
|
for (int i = 0; i < DN_MAX_LEVELS; i++) {
|
|
wmsum_fini(&dbuf_sums.cache_levels[i]);
|
|
wmsum_fini(&dbuf_sums.cache_levels_bytes[i]);
|
|
}
|
|
wmsum_fini(&dbuf_sums.hash_hits);
|
|
wmsum_fini(&dbuf_sums.hash_misses);
|
|
wmsum_fini(&dbuf_sums.hash_collisions);
|
|
wmsum_fini(&dbuf_sums.hash_chains);
|
|
wmsum_fini(&dbuf_sums.hash_insert_race);
|
|
wmsum_fini(&dbuf_sums.metadata_cache_count);
|
|
wmsum_fini(&dbuf_sums.metadata_cache_overflow);
|
|
}
|
|
|
|
/*
|
|
* Other stuff.
|
|
*/
|
|
|
|
#ifdef ZFS_DEBUG
|
|
static void
|
|
dbuf_verify(dmu_buf_impl_t *db)
|
|
{
|
|
dnode_t *dn;
|
|
dbuf_dirty_record_t *dr;
|
|
uint32_t txg_prev;
|
|
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
|
|
if (!(zfs_flags & ZFS_DEBUG_DBUF_VERIFY))
|
|
return;
|
|
|
|
ASSERT(db->db_objset != NULL);
|
|
DB_DNODE_ENTER(db);
|
|
dn = DB_DNODE(db);
|
|
if (dn == NULL) {
|
|
ASSERT(db->db_parent == NULL);
|
|
ASSERT(db->db_blkptr == NULL);
|
|
} else {
|
|
ASSERT3U(db->db.db_object, ==, dn->dn_object);
|
|
ASSERT3P(db->db_objset, ==, dn->dn_objset);
|
|
ASSERT3U(db->db_level, <, dn->dn_nlevels);
|
|
ASSERT(db->db_blkid == DMU_BONUS_BLKID ||
|
|
db->db_blkid == DMU_SPILL_BLKID ||
|
|
!avl_is_empty(&dn->dn_dbufs));
|
|
}
|
|
if (db->db_blkid == DMU_BONUS_BLKID) {
|
|
ASSERT(dn != NULL);
|
|
ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen);
|
|
ASSERT3U(db->db.db_offset, ==, DMU_BONUS_BLKID);
|
|
} else if (db->db_blkid == DMU_SPILL_BLKID) {
|
|
ASSERT(dn != NULL);
|
|
ASSERT0(db->db.db_offset);
|
|
} else {
|
|
ASSERT3U(db->db.db_offset, ==, db->db_blkid * db->db.db_size);
|
|
}
|
|
|
|
if ((dr = list_head(&db->db_dirty_records)) != NULL) {
|
|
ASSERT(dr->dr_dbuf == db);
|
|
txg_prev = dr->dr_txg;
|
|
for (dr = list_next(&db->db_dirty_records, dr); dr != NULL;
|
|
dr = list_next(&db->db_dirty_records, dr)) {
|
|
ASSERT(dr->dr_dbuf == db);
|
|
ASSERT(txg_prev > dr->dr_txg);
|
|
txg_prev = dr->dr_txg;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We can't assert that db_size matches dn_datablksz because it
|
|
* can be momentarily different when another thread is doing
|
|
* dnode_set_blksz().
|
|
*/
|
|
if (db->db_level == 0 && db->db.db_object == DMU_META_DNODE_OBJECT) {
|
|
dr = db->db_data_pending;
|
|
/*
|
|
* It should only be modified in syncing context, so
|
|
* make sure we only have one copy of the data.
|
|
*/
|
|
ASSERT(dr == NULL || dr->dt.dl.dr_data == db->db_buf);
|
|
}
|
|
|
|
/* verify db->db_blkptr */
|
|
if (db->db_blkptr) {
|
|
if (db->db_parent == dn->dn_dbuf) {
|
|
/* db is pointed to by the dnode */
|
|
/* ASSERT3U(db->db_blkid, <, dn->dn_nblkptr); */
|
|
if (DMU_OBJECT_IS_SPECIAL(db->db.db_object))
|
|
ASSERT(db->db_parent == NULL);
|
|
else
|
|
ASSERT(db->db_parent != NULL);
|
|
if (db->db_blkid != DMU_SPILL_BLKID)
|
|
ASSERT3P(db->db_blkptr, ==,
|
|
&dn->dn_phys->dn_blkptr[db->db_blkid]);
|
|
} else {
|
|
/* db is pointed to by an indirect block */
|
|
int epb __maybe_unused = db->db_parent->db.db_size >>
|
|
SPA_BLKPTRSHIFT;
|
|
ASSERT3U(db->db_parent->db_level, ==, db->db_level+1);
|
|
ASSERT3U(db->db_parent->db.db_object, ==,
|
|
db->db.db_object);
|
|
/*
|
|
* dnode_grow_indblksz() can make this fail if we don't
|
|
* have the parent's rwlock. XXX indblksz no longer
|
|
* grows. safe to do this now?
|
|
*/
|
|
if (RW_LOCK_HELD(&db->db_parent->db_rwlock)) {
|
|
ASSERT3P(db->db_blkptr, ==,
|
|
((blkptr_t *)db->db_parent->db.db_data +
|
|
db->db_blkid % epb));
|
|
}
|
|
}
|
|
}
|
|
if ((db->db_blkptr == NULL || BP_IS_HOLE(db->db_blkptr)) &&
|
|
(db->db_buf == NULL || db->db_buf->b_data) &&
|
|
db->db.db_data && db->db_blkid != DMU_BONUS_BLKID &&
|
|
db->db_state != DB_FILL && (dn == NULL || !dn->dn_free_txg)) {
|
|
/*
|
|
* If the blkptr isn't set but they have nonzero data,
|
|
* it had better be dirty, otherwise we'll lose that
|
|
* data when we evict this buffer.
|
|
*
|
|
* There is an exception to this rule for indirect blocks; in
|
|
* this case, if the indirect block is a hole, we fill in a few
|
|
* fields on each of the child blocks (importantly, birth time)
|
|
* to prevent hole birth times from being lost when you
|
|
* partially fill in a hole.
|
|
*/
|
|
if (db->db_dirtycnt == 0) {
|
|
if (db->db_level == 0) {
|
|
uint64_t *buf = db->db.db_data;
|
|
int i;
|
|
|
|
for (i = 0; i < db->db.db_size >> 3; i++) {
|
|
ASSERT(buf[i] == 0);
|
|
}
|
|
} else {
|
|
blkptr_t *bps = db->db.db_data;
|
|
ASSERT3U(1 << DB_DNODE(db)->dn_indblkshift, ==,
|
|
db->db.db_size);
|
|
/*
|
|
* We want to verify that all the blkptrs in the
|
|
* indirect block are holes, but we may have
|
|
* automatically set up a few fields for them.
|
|
* We iterate through each blkptr and verify
|
|
* they only have those fields set.
|
|
*/
|
|
for (int i = 0;
|
|
i < db->db.db_size / sizeof (blkptr_t);
|
|
i++) {
|
|
blkptr_t *bp = &bps[i];
|
|
ASSERT(ZIO_CHECKSUM_IS_ZERO(
|
|
&bp->blk_cksum));
|
|
ASSERT(
|
|
DVA_IS_EMPTY(&bp->blk_dva[0]) &&
|
|
DVA_IS_EMPTY(&bp->blk_dva[1]) &&
|
|
DVA_IS_EMPTY(&bp->blk_dva[2]));
|
|
ASSERT0(bp->blk_fill);
|
|
ASSERT0(bp->blk_pad[0]);
|
|
ASSERT0(bp->blk_pad[1]);
|
|
ASSERT(!BP_IS_EMBEDDED(bp));
|
|
ASSERT(BP_IS_HOLE(bp));
|
|
ASSERT0(bp->blk_phys_birth);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
DB_DNODE_EXIT(db);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
dbuf_clear_data(dmu_buf_impl_t *db)
|
|
{
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
dbuf_evict_user(db);
|
|
ASSERT3P(db->db_buf, ==, NULL);
|
|
db->db.db_data = NULL;
|
|
if (db->db_state != DB_NOFILL) {
|
|
db->db_state = DB_UNCACHED;
|
|
DTRACE_SET_STATE(db, "clear data");
|
|
}
|
|
}
|
|
|
|
static void
|
|
dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf)
|
|
{
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
ASSERT(buf != NULL);
|
|
|
|
db->db_buf = buf;
|
|
ASSERT(buf->b_data != NULL);
|
|
db->db.db_data = buf->b_data;
|
|
}
|
|
|
|
static arc_buf_t *
|
|
dbuf_alloc_arcbuf(dmu_buf_impl_t *db)
|
|
{
|
|
spa_t *spa = db->db_objset->os_spa;
|
|
|
|
return (arc_alloc_buf(spa, db, DBUF_GET_BUFC_TYPE(db), db->db.db_size));
|
|
}
|
|
|
|
/*
|
|
* Loan out an arc_buf for read. Return the loaned arc_buf.
|
|
*/
|
|
arc_buf_t *
|
|
dbuf_loan_arcbuf(dmu_buf_impl_t *db)
|
|
{
|
|
arc_buf_t *abuf;
|
|
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
mutex_enter(&db->db_mtx);
|
|
if (arc_released(db->db_buf) || zfs_refcount_count(&db->db_holds) > 1) {
|
|
int blksz = db->db.db_size;
|
|
spa_t *spa = db->db_objset->os_spa;
|
|
|
|
mutex_exit(&db->db_mtx);
|
|
abuf = arc_loan_buf(spa, B_FALSE, blksz);
|
|
memcpy(abuf->b_data, db->db.db_data, blksz);
|
|
} else {
|
|
abuf = db->db_buf;
|
|
arc_loan_inuse_buf(abuf, db);
|
|
db->db_buf = NULL;
|
|
dbuf_clear_data(db);
|
|
mutex_exit(&db->db_mtx);
|
|
}
|
|
return (abuf);
|
|
}
|
|
|
|
/*
|
|
* Calculate which level n block references the data at the level 0 offset
|
|
* provided.
|
|
*/
|
|
uint64_t
|
|
dbuf_whichblock(const dnode_t *dn, const int64_t level, const uint64_t offset)
|
|
{
|
|
if (dn->dn_datablkshift != 0 && dn->dn_indblkshift != 0) {
|
|
/*
|
|
* The level n blkid is equal to the level 0 blkid divided by
|
|
* the number of level 0s in a level n block.
|
|
*
|
|
* The level 0 blkid is offset >> datablkshift =
|
|
* offset / 2^datablkshift.
|
|
*
|
|
* The number of level 0s in a level n is the number of block
|
|
* pointers in an indirect block, raised to the power of level.
|
|
* This is 2^(indblkshift - SPA_BLKPTRSHIFT)^level =
|
|
* 2^(level*(indblkshift - SPA_BLKPTRSHIFT)).
|
|
*
|
|
* Thus, the level n blkid is: offset /
|
|
* ((2^datablkshift)*(2^(level*(indblkshift-SPA_BLKPTRSHIFT))))
|
|
* = offset / 2^(datablkshift + level *
|
|
* (indblkshift - SPA_BLKPTRSHIFT))
|
|
* = offset >> (datablkshift + level *
|
|
* (indblkshift - SPA_BLKPTRSHIFT))
|
|
*/
|
|
|
|
const unsigned exp = dn->dn_datablkshift +
|
|
level * (dn->dn_indblkshift - SPA_BLKPTRSHIFT);
|
|
|
|
if (exp >= 8 * sizeof (offset)) {
|
|
/* This only happens on the highest indirection level */
|
|
ASSERT3U(level, ==, dn->dn_nlevels - 1);
|
|
return (0);
|
|
}
|
|
|
|
ASSERT3U(exp, <, 8 * sizeof (offset));
|
|
|
|
return (offset >> exp);
|
|
} else {
|
|
ASSERT3U(offset, <, dn->dn_datablksz);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function is used to lock the parent of the provided dbuf. This should be
|
|
* used when modifying or reading db_blkptr.
|
|
*/
|
|
db_lock_type_t
|
|
dmu_buf_lock_parent(dmu_buf_impl_t *db, krw_t rw, const void *tag)
|
|
{
|
|
enum db_lock_type ret = DLT_NONE;
|
|
if (db->db_parent != NULL) {
|
|
rw_enter(&db->db_parent->db_rwlock, rw);
|
|
ret = DLT_PARENT;
|
|
} else if (dmu_objset_ds(db->db_objset) != NULL) {
|
|
rrw_enter(&dmu_objset_ds(db->db_objset)->ds_bp_rwlock, rw,
|
|
tag);
|
|
ret = DLT_OBJSET;
|
|
}
|
|
/*
|
|
* We only return a DLT_NONE lock when it's the top-most indirect block
|
|
* of the meta-dnode of the MOS.
|
|
*/
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* We need to pass the lock type in because it's possible that the block will
|
|
* move from being the topmost indirect block in a dnode (and thus, have no
|
|
* parent) to not the top-most via an indirection increase. This would cause a
|
|
* panic if we didn't pass the lock type in.
|
|
*/
|
|
void
|
|
dmu_buf_unlock_parent(dmu_buf_impl_t *db, db_lock_type_t type, const void *tag)
|
|
{
|
|
if (type == DLT_PARENT)
|
|
rw_exit(&db->db_parent->db_rwlock);
|
|
else if (type == DLT_OBJSET)
|
|
rrw_exit(&dmu_objset_ds(db->db_objset)->ds_bp_rwlock, tag);
|
|
}
|
|
|
|
static void
|
|
dbuf_read_done(zio_t *zio, const zbookmark_phys_t *zb, const blkptr_t *bp,
|
|
arc_buf_t *buf, void *vdb)
|
|
{
|
|
(void) zb, (void) bp;
|
|
dmu_buf_impl_t *db = vdb;
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
ASSERT3U(db->db_state, ==, DB_READ);
|
|
/*
|
|
* All reads are synchronous, so we must have a hold on the dbuf
|
|
*/
|
|
ASSERT(zfs_refcount_count(&db->db_holds) > 0);
|
|
ASSERT(db->db_buf == NULL);
|
|
ASSERT(db->db.db_data == NULL);
|
|
if (buf == NULL) {
|
|
/* i/o error */
|
|
ASSERT(zio == NULL || zio->io_error != 0);
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
ASSERT3P(db->db_buf, ==, NULL);
|
|
db->db_state = DB_UNCACHED;
|
|
DTRACE_SET_STATE(db, "i/o error");
|
|
} else if (db->db_level == 0 && db->db_freed_in_flight) {
|
|
/* freed in flight */
|
|
ASSERT(zio == NULL || zio->io_error == 0);
|
|
arc_release(buf, db);
|
|
memset(buf->b_data, 0, db->db.db_size);
|
|
arc_buf_freeze(buf);
|
|
db->db_freed_in_flight = FALSE;
|
|
dbuf_set_data(db, buf);
|
|
db->db_state = DB_CACHED;
|
|
DTRACE_SET_STATE(db, "freed in flight");
|
|
} else {
|
|
/* success */
|
|
ASSERT(zio == NULL || zio->io_error == 0);
|
|
dbuf_set_data(db, buf);
|
|
db->db_state = DB_CACHED;
|
|
DTRACE_SET_STATE(db, "successful read");
|
|
}
|
|
cv_broadcast(&db->db_changed);
|
|
dbuf_rele_and_unlock(db, NULL, B_FALSE);
|
|
}
|
|
|
|
/*
|
|
* Shortcut for performing reads on bonus dbufs. Returns
|
|
* an error if we fail to verify the dnode associated with
|
|
* a decrypted block. Otherwise success.
|
|
*/
|
|
static int
|
|
dbuf_read_bonus(dmu_buf_impl_t *db, dnode_t *dn, uint32_t flags)
|
|
{
|
|
int bonuslen, max_bonuslen, err;
|
|
|
|
err = dbuf_read_verify_dnode_crypt(db, flags);
|
|
if (err)
|
|
return (err);
|
|
|
|
bonuslen = MIN(dn->dn_bonuslen, dn->dn_phys->dn_bonuslen);
|
|
max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
ASSERT(DB_DNODE_HELD(db));
|
|
ASSERT3U(bonuslen, <=, db->db.db_size);
|
|
db->db.db_data = kmem_alloc(max_bonuslen, KM_SLEEP);
|
|
arc_space_consume(max_bonuslen, ARC_SPACE_BONUS);
|
|
if (bonuslen < max_bonuslen)
|
|
memset(db->db.db_data, 0, max_bonuslen);
|
|
if (bonuslen)
|
|
memcpy(db->db.db_data, DN_BONUS(dn->dn_phys), bonuslen);
|
|
db->db_state = DB_CACHED;
|
|
DTRACE_SET_STATE(db, "bonus buffer filled");
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
dbuf_handle_indirect_hole(dmu_buf_impl_t *db, dnode_t *dn, blkptr_t *dbbp)
|
|
{
|
|
blkptr_t *bps = db->db.db_data;
|
|
uint32_t indbs = 1ULL << dn->dn_indblkshift;
|
|
int n_bps = indbs >> SPA_BLKPTRSHIFT;
|
|
|
|
for (int i = 0; i < n_bps; i++) {
|
|
blkptr_t *bp = &bps[i];
|
|
|
|
ASSERT3U(BP_GET_LSIZE(dbbp), ==, indbs);
|
|
BP_SET_LSIZE(bp, BP_GET_LEVEL(dbbp) == 1 ?
|
|
dn->dn_datablksz : BP_GET_LSIZE(dbbp));
|
|
BP_SET_TYPE(bp, BP_GET_TYPE(dbbp));
|
|
BP_SET_LEVEL(bp, BP_GET_LEVEL(dbbp) - 1);
|
|
BP_SET_BIRTH(bp, dbbp->blk_birth, 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle reads on dbufs that are holes, if necessary. This function
|
|
* requires that the dbuf's mutex is held. Returns success (0) if action
|
|
* was taken, ENOENT if no action was taken.
|
|
*/
|
|
static int
|
|
dbuf_read_hole(dmu_buf_impl_t *db, dnode_t *dn, blkptr_t *bp)
|
|
{
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
|
|
int is_hole = bp == NULL || BP_IS_HOLE(bp);
|
|
/*
|
|
* For level 0 blocks only, if the above check fails:
|
|
* Recheck BP_IS_HOLE() after dnode_block_freed() in case dnode_sync()
|
|
* processes the delete record and clears the bp while we are waiting
|
|
* for the dn_mtx (resulting in a "no" from block_freed).
|
|
*/
|
|
if (!is_hole && db->db_level == 0)
|
|
is_hole = dnode_block_freed(dn, db->db_blkid) || BP_IS_HOLE(bp);
|
|
|
|
if (is_hole) {
|
|
dbuf_set_data(db, dbuf_alloc_arcbuf(db));
|
|
memset(db->db.db_data, 0, db->db.db_size);
|
|
|
|
if (bp != NULL && db->db_level > 0 && BP_IS_HOLE(bp) &&
|
|
bp->blk_birth != 0) {
|
|
dbuf_handle_indirect_hole(db, dn, bp);
|
|
}
|
|
db->db_state = DB_CACHED;
|
|
DTRACE_SET_STATE(db, "hole read satisfied");
|
|
return (0);
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
|
|
/*
|
|
* This function ensures that, when doing a decrypting read of a block,
|
|
* we make sure we have decrypted the dnode associated with it. We must do
|
|
* this so that we ensure we are fully authenticating the checksum-of-MACs
|
|
* tree from the root of the objset down to this block. Indirect blocks are
|
|
* always verified against their secure checksum-of-MACs assuming that the
|
|
* dnode containing them is correct. Now that we are doing a decrypting read,
|
|
* we can be sure that the key is loaded and verify that assumption. This is
|
|
* especially important considering that we always read encrypted dnode
|
|
* blocks as raw data (without verifying their MACs) to start, and
|
|
* decrypt / authenticate them when we need to read an encrypted bonus buffer.
|
|
*/
|
|
static int
|
|
dbuf_read_verify_dnode_crypt(dmu_buf_impl_t *db, uint32_t flags)
|
|
{
|
|
int err = 0;
|
|
objset_t *os = db->db_objset;
|
|
arc_buf_t *dnode_abuf;
|
|
dnode_t *dn;
|
|
zbookmark_phys_t zb;
|
|
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
|
|
if ((flags & DB_RF_NO_DECRYPT) != 0 ||
|
|
!os->os_encrypted || os->os_raw_receive)
|
|
return (0);
|
|
|
|
DB_DNODE_ENTER(db);
|
|
dn = DB_DNODE(db);
|
|
dnode_abuf = (dn->dn_dbuf != NULL) ? dn->dn_dbuf->db_buf : NULL;
|
|
|
|
if (dnode_abuf == NULL || !arc_is_encrypted(dnode_abuf)) {
|
|
DB_DNODE_EXIT(db);
|
|
return (0);
|
|
}
|
|
|
|
SET_BOOKMARK(&zb, dmu_objset_id(os),
|
|
DMU_META_DNODE_OBJECT, 0, dn->dn_dbuf->db_blkid);
|
|
err = arc_untransform(dnode_abuf, os->os_spa, &zb, B_TRUE);
|
|
|
|
/*
|
|
* An error code of EACCES tells us that the key is still not
|
|
* available. This is ok if we are only reading authenticated
|
|
* (and therefore non-encrypted) blocks.
|
|
*/
|
|
if (err == EACCES && ((db->db_blkid != DMU_BONUS_BLKID &&
|
|
!DMU_OT_IS_ENCRYPTED(dn->dn_type)) ||
|
|
(db->db_blkid == DMU_BONUS_BLKID &&
|
|
!DMU_OT_IS_ENCRYPTED(dn->dn_bonustype))))
|
|
err = 0;
|
|
|
|
DB_DNODE_EXIT(db);
|
|
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* Drops db_mtx and the parent lock specified by dblt and tag before
|
|
* returning.
|
|
*/
|
|
static int
|
|
dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags,
|
|
db_lock_type_t dblt, const void *tag)
|
|
{
|
|
dnode_t *dn;
|
|
zbookmark_phys_t zb;
|
|
uint32_t aflags = ARC_FLAG_NOWAIT;
|
|
int err, zio_flags;
|
|
blkptr_t bp, *bpp;
|
|
|
|
DB_DNODE_ENTER(db);
|
|
dn = DB_DNODE(db);
|
|
ASSERT(!zfs_refcount_is_zero(&db->db_holds));
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL);
|
|
ASSERT(db->db_buf == NULL);
|
|
ASSERT(db->db_parent == NULL ||
|
|
RW_LOCK_HELD(&db->db_parent->db_rwlock));
|
|
|
|
if (db->db_blkid == DMU_BONUS_BLKID) {
|
|
err = dbuf_read_bonus(db, dn, flags);
|
|
goto early_unlock;
|
|
}
|
|
|
|
if (db->db_state == DB_UNCACHED) {
|
|
if (db->db_blkptr == NULL) {
|
|
bpp = NULL;
|
|
} else {
|
|
bp = *db->db_blkptr;
|
|
bpp = &bp;
|
|
}
|
|
} else {
|
|
dbuf_dirty_record_t *dr;
|
|
|
|
ASSERT3S(db->db_state, ==, DB_NOFILL);
|
|
|
|
/*
|
|
* Block cloning: If we have a pending block clone,
|
|
* we don't want to read the underlying block, but the content
|
|
* of the block being cloned, so we have the most recent data.
|
|
*/
|
|
dr = list_head(&db->db_dirty_records);
|
|
if (dr == NULL || !dr->dt.dl.dr_brtwrite) {
|
|
err = EIO;
|
|
goto early_unlock;
|
|
}
|
|
bp = dr->dt.dl.dr_overridden_by;
|
|
bpp = &bp;
|
|
}
|
|
|
|
err = dbuf_read_hole(db, dn, bpp);
|
|
if (err == 0)
|
|
goto early_unlock;
|
|
|
|
ASSERT(bpp != NULL);
|
|
|
|
/*
|
|
* Any attempt to read a redacted block should result in an error. This
|
|
* will never happen under normal conditions, but can be useful for
|
|
* debugging purposes.
|
|
*/
|
|
if (BP_IS_REDACTED(bpp)) {
|
|
ASSERT(dsl_dataset_feature_is_active(
|
|
db->db_objset->os_dsl_dataset,
|
|
SPA_FEATURE_REDACTED_DATASETS));
|
|
err = SET_ERROR(EIO);
|
|
goto early_unlock;
|
|
}
|
|
|
|
SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
|
|
db->db.db_object, db->db_level, db->db_blkid);
|
|
|
|
/*
|
|
* All bps of an encrypted os should have the encryption bit set.
|
|
* If this is not true it indicates tampering and we report an error.
|
|
*/
|
|
if (db->db_objset->os_encrypted && !BP_USES_CRYPT(bpp)) {
|
|
spa_log_error(db->db_objset->os_spa, &zb, &bpp->blk_birth);
|
|
zfs_panic_recover("unencrypted block in encrypted "
|
|
"object set %llu", dmu_objset_id(db->db_objset));
|
|
err = SET_ERROR(EIO);
|
|
goto early_unlock;
|
|
}
|
|
|
|
err = dbuf_read_verify_dnode_crypt(db, flags);
|
|
if (err != 0)
|
|
goto early_unlock;
|
|
|
|
DB_DNODE_EXIT(db);
|
|
|
|
db->db_state = DB_READ;
|
|
DTRACE_SET_STATE(db, "read issued");
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
if (!DBUF_IS_CACHEABLE(db))
|
|
aflags |= ARC_FLAG_UNCACHED;
|
|
else if (dbuf_is_l2cacheable(db))
|
|
aflags |= ARC_FLAG_L2CACHE;
|
|
|
|
dbuf_add_ref(db, NULL);
|
|
|
|
zio_flags = (flags & DB_RF_CANFAIL) ?
|
|
ZIO_FLAG_CANFAIL : ZIO_FLAG_MUSTSUCCEED;
|
|
|
|
if ((flags & DB_RF_NO_DECRYPT) && BP_IS_PROTECTED(db->db_blkptr))
|
|
zio_flags |= ZIO_FLAG_RAW;
|
|
/*
|
|
* The zio layer will copy the provided blkptr later, but we have our
|
|
* own copy so that we can release the parent's rwlock. We have to
|
|
* do that so that if dbuf_read_done is called synchronously (on
|
|
* an l1 cache hit) we don't acquire the db_mtx while holding the
|
|
* parent's rwlock, which would be a lock ordering violation.
|
|
*/
|
|
dmu_buf_unlock_parent(db, dblt, tag);
|
|
(void) arc_read(zio, db->db_objset->os_spa, bpp,
|
|
dbuf_read_done, db, ZIO_PRIORITY_SYNC_READ, zio_flags,
|
|
&aflags, &zb);
|
|
return (err);
|
|
early_unlock:
|
|
DB_DNODE_EXIT(db);
|
|
mutex_exit(&db->db_mtx);
|
|
dmu_buf_unlock_parent(db, dblt, tag);
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* This is our just-in-time copy function. It makes a copy of buffers that
|
|
* have been modified in a previous transaction group before we access them in
|
|
* the current active group.
|
|
*
|
|
* This function is used in three places: when we are dirtying a buffer for the
|
|
* first time in a txg, when we are freeing a range in a dnode that includes
|
|
* this buffer, and when we are accessing a buffer which was received compressed
|
|
* and later referenced in a WRITE_BYREF record.
|
|
*
|
|
* Note that when we are called from dbuf_free_range() we do not put a hold on
|
|
* the buffer, we just traverse the active dbuf list for the dnode.
|
|
*/
|
|
static void
|
|
dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg)
|
|
{
|
|
dbuf_dirty_record_t *dr = list_head(&db->db_dirty_records);
|
|
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
ASSERT(db->db.db_data != NULL);
|
|
ASSERT(db->db_level == 0);
|
|
ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT);
|
|
|
|
if (dr == NULL ||
|
|
(dr->dt.dl.dr_data !=
|
|
((db->db_blkid == DMU_BONUS_BLKID) ? db->db.db_data : db->db_buf)))
|
|
return;
|
|
|
|
/*
|
|
* If the last dirty record for this dbuf has not yet synced
|
|
* and its referencing the dbuf data, either:
|
|
* reset the reference to point to a new copy,
|
|
* or (if there a no active holders)
|
|
* just null out the current db_data pointer.
|
|
*/
|
|
ASSERT3U(dr->dr_txg, >=, txg - 2);
|
|
if (db->db_blkid == DMU_BONUS_BLKID) {
|
|
dnode_t *dn = DB_DNODE(db);
|
|
int bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
|
|
dr->dt.dl.dr_data = kmem_alloc(bonuslen, KM_SLEEP);
|
|
arc_space_consume(bonuslen, ARC_SPACE_BONUS);
|
|
memcpy(dr->dt.dl.dr_data, db->db.db_data, bonuslen);
|
|
} else if (zfs_refcount_count(&db->db_holds) > db->db_dirtycnt) {
|
|
dnode_t *dn = DB_DNODE(db);
|
|
int size = arc_buf_size(db->db_buf);
|
|
arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
|
|
spa_t *spa = db->db_objset->os_spa;
|
|
enum zio_compress compress_type =
|
|
arc_get_compression(db->db_buf);
|
|
uint8_t complevel = arc_get_complevel(db->db_buf);
|
|
|
|
if (arc_is_encrypted(db->db_buf)) {
|
|
boolean_t byteorder;
|
|
uint8_t salt[ZIO_DATA_SALT_LEN];
|
|
uint8_t iv[ZIO_DATA_IV_LEN];
|
|
uint8_t mac[ZIO_DATA_MAC_LEN];
|
|
|
|
arc_get_raw_params(db->db_buf, &byteorder, salt,
|
|
iv, mac);
|
|
dr->dt.dl.dr_data = arc_alloc_raw_buf(spa, db,
|
|
dmu_objset_id(dn->dn_objset), byteorder, salt, iv,
|
|
mac, dn->dn_type, size, arc_buf_lsize(db->db_buf),
|
|
compress_type, complevel);
|
|
} else if (compress_type != ZIO_COMPRESS_OFF) {
|
|
ASSERT3U(type, ==, ARC_BUFC_DATA);
|
|
dr->dt.dl.dr_data = arc_alloc_compressed_buf(spa, db,
|
|
size, arc_buf_lsize(db->db_buf), compress_type,
|
|
complevel);
|
|
} else {
|
|
dr->dt.dl.dr_data = arc_alloc_buf(spa, db, type, size);
|
|
}
|
|
memcpy(dr->dt.dl.dr_data->b_data, db->db.db_data, size);
|
|
} else {
|
|
db->db_buf = NULL;
|
|
dbuf_clear_data(db);
|
|
}
|
|
}
|
|
|
|
int
|
|
dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
|
|
{
|
|
int err = 0;
|
|
boolean_t prefetch;
|
|
dnode_t *dn;
|
|
|
|
/*
|
|
* We don't have to hold the mutex to check db_state because it
|
|
* can't be freed while we have a hold on the buffer.
|
|
*/
|
|
ASSERT(!zfs_refcount_is_zero(&db->db_holds));
|
|
|
|
DB_DNODE_ENTER(db);
|
|
dn = DB_DNODE(db);
|
|
|
|
prefetch = db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID &&
|
|
(flags & DB_RF_NOPREFETCH) == 0 && dn != NULL;
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
if (flags & DB_RF_PARTIAL_FIRST)
|
|
db->db_partial_read = B_TRUE;
|
|
else if (!(flags & DB_RF_PARTIAL_MORE))
|
|
db->db_partial_read = B_FALSE;
|
|
if (db->db_state == DB_CACHED) {
|
|
/*
|
|
* Ensure that this block's dnode has been decrypted if
|
|
* the caller has requested decrypted data.
|
|
*/
|
|
err = dbuf_read_verify_dnode_crypt(db, flags);
|
|
|
|
/*
|
|
* If the arc buf is compressed or encrypted and the caller
|
|
* requested uncompressed data, we need to untransform it
|
|
* before returning. We also call arc_untransform() on any
|
|
* unauthenticated blocks, which will verify their MAC if
|
|
* the key is now available.
|
|
*/
|
|
if (err == 0 && db->db_buf != NULL &&
|
|
(flags & DB_RF_NO_DECRYPT) == 0 &&
|
|
(arc_is_encrypted(db->db_buf) ||
|
|
arc_is_unauthenticated(db->db_buf) ||
|
|
arc_get_compression(db->db_buf) != ZIO_COMPRESS_OFF)) {
|
|
spa_t *spa = dn->dn_objset->os_spa;
|
|
zbookmark_phys_t zb;
|
|
|
|
SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
|
|
db->db.db_object, db->db_level, db->db_blkid);
|
|
dbuf_fix_old_data(db, spa_syncing_txg(spa));
|
|
err = arc_untransform(db->db_buf, spa, &zb, B_FALSE);
|
|
dbuf_set_data(db, db->db_buf);
|
|
}
|
|
mutex_exit(&db->db_mtx);
|
|
if (err == 0 && prefetch) {
|
|
dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE,
|
|
B_FALSE, flags & DB_RF_HAVESTRUCT);
|
|
}
|
|
DB_DNODE_EXIT(db);
|
|
DBUF_STAT_BUMP(hash_hits);
|
|
} else if (db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL) {
|
|
boolean_t need_wait = B_FALSE;
|
|
|
|
db_lock_type_t dblt = dmu_buf_lock_parent(db, RW_READER, FTAG);
|
|
|
|
if (zio == NULL && (db->db_state == DB_NOFILL ||
|
|
(db->db_blkptr != NULL && !BP_IS_HOLE(db->db_blkptr)))) {
|
|
spa_t *spa = dn->dn_objset->os_spa;
|
|
zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL);
|
|
need_wait = B_TRUE;
|
|
}
|
|
err = dbuf_read_impl(db, zio, flags, dblt, FTAG);
|
|
/*
|
|
* dbuf_read_impl has dropped db_mtx and our parent's rwlock
|
|
* for us
|
|
*/
|
|
if (!err && prefetch) {
|
|
dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE,
|
|
db->db_state != DB_CACHED,
|
|
flags & DB_RF_HAVESTRUCT);
|
|
}
|
|
|
|
DB_DNODE_EXIT(db);
|
|
DBUF_STAT_BUMP(hash_misses);
|
|
|
|
/*
|
|
* If we created a zio_root we must execute it to avoid
|
|
* leaking it, even if it isn't attached to any work due
|
|
* to an error in dbuf_read_impl().
|
|
*/
|
|
if (need_wait) {
|
|
if (err == 0)
|
|
err = zio_wait(zio);
|
|
else
|
|
VERIFY0(zio_wait(zio));
|
|
}
|
|
} else {
|
|
/*
|
|
* Another reader came in while the dbuf was in flight
|
|
* between UNCACHED and CACHED. Either a writer will finish
|
|
* writing the buffer (sending the dbuf to CACHED) or the
|
|
* first reader's request will reach the read_done callback
|
|
* and send the dbuf to CACHED. Otherwise, a failure
|
|
* occurred and the dbuf went to UNCACHED.
|
|
*/
|
|
mutex_exit(&db->db_mtx);
|
|
if (prefetch) {
|
|
dmu_zfetch(&dn->dn_zfetch, db->db_blkid, 1, B_TRUE,
|
|
B_TRUE, flags & DB_RF_HAVESTRUCT);
|
|
}
|
|
DB_DNODE_EXIT(db);
|
|
DBUF_STAT_BUMP(hash_misses);
|
|
|
|
/* Skip the wait per the caller's request. */
|
|
if ((flags & DB_RF_NEVERWAIT) == 0) {
|
|
mutex_enter(&db->db_mtx);
|
|
while (db->db_state == DB_READ ||
|
|
db->db_state == DB_FILL) {
|
|
ASSERT(db->db_state == DB_READ ||
|
|
(flags & DB_RF_HAVESTRUCT) == 0);
|
|
DTRACE_PROBE2(blocked__read, dmu_buf_impl_t *,
|
|
db, zio_t *, zio);
|
|
cv_wait(&db->db_changed, &db->db_mtx);
|
|
}
|
|
if (db->db_state == DB_UNCACHED)
|
|
err = SET_ERROR(EIO);
|
|
mutex_exit(&db->db_mtx);
|
|
}
|
|
}
|
|
|
|
return (err);
|
|
}
|
|
|
|
static void
|
|
dbuf_noread(dmu_buf_impl_t *db)
|
|
{
|
|
ASSERT(!zfs_refcount_is_zero(&db->db_holds));
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
mutex_enter(&db->db_mtx);
|
|
while (db->db_state == DB_READ || db->db_state == DB_FILL)
|
|
cv_wait(&db->db_changed, &db->db_mtx);
|
|
if (db->db_state == DB_UNCACHED) {
|
|
ASSERT(db->db_buf == NULL);
|
|
ASSERT(db->db.db_data == NULL);
|
|
dbuf_set_data(db, dbuf_alloc_arcbuf(db));
|
|
db->db_state = DB_FILL;
|
|
DTRACE_SET_STATE(db, "assigning filled buffer");
|
|
} else if (db->db_state == DB_NOFILL) {
|
|
dbuf_clear_data(db);
|
|
} else {
|
|
ASSERT3U(db->db_state, ==, DB_CACHED);
|
|
}
|
|
mutex_exit(&db->db_mtx);
|
|
}
|
|
|
|
void
|
|
dbuf_unoverride(dbuf_dirty_record_t *dr)
|
|
{
|
|
dmu_buf_impl_t *db = dr->dr_dbuf;
|
|
blkptr_t *bp = &dr->dt.dl.dr_overridden_by;
|
|
uint64_t txg = dr->dr_txg;
|
|
boolean_t release;
|
|
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
/*
|
|
* This assert is valid because dmu_sync() expects to be called by
|
|
* a zilog's get_data while holding a range lock. This call only
|
|
* comes from dbuf_dirty() callers who must also hold a range lock.
|
|
*/
|
|
ASSERT(dr->dt.dl.dr_override_state != DR_IN_DMU_SYNC);
|
|
ASSERT(db->db_level == 0);
|
|
|
|
if (db->db_blkid == DMU_BONUS_BLKID ||
|
|
dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN)
|
|
return;
|
|
|
|
ASSERT(db->db_data_pending != dr);
|
|
|
|
/* free this block */
|
|
if (!BP_IS_HOLE(bp) && !dr->dt.dl.dr_nopwrite)
|
|
zio_free(db->db_objset->os_spa, txg, bp);
|
|
|
|
release = !dr->dt.dl.dr_brtwrite;
|
|
dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN;
|
|
dr->dt.dl.dr_nopwrite = B_FALSE;
|
|
dr->dt.dl.dr_brtwrite = B_FALSE;
|
|
dr->dt.dl.dr_has_raw_params = B_FALSE;
|
|
|
|
/*
|
|
* Release the already-written buffer, so we leave it in
|
|
* a consistent dirty state. Note that all callers are
|
|
* modifying the buffer, so they will immediately do
|
|
* another (redundant) arc_release(). Therefore, leave
|
|
* the buf thawed to save the effort of freezing &
|
|
* immediately re-thawing it.
|
|
*/
|
|
if (release)
|
|
arc_release(dr->dt.dl.dr_data, db);
|
|
}
|
|
|
|
/*
|
|
* Evict (if its unreferenced) or clear (if its referenced) any level-0
|
|
* data blocks in the free range, so that any future readers will find
|
|
* empty blocks.
|
|
*/
|
|
void
|
|
dbuf_free_range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid,
|
|
dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db_search;
|
|
dmu_buf_impl_t *db, *db_next;
|
|
uint64_t txg = tx->tx_txg;
|
|
avl_index_t where;
|
|
dbuf_dirty_record_t *dr;
|
|
|
|
if (end_blkid > dn->dn_maxblkid &&
|
|
!(start_blkid == DMU_SPILL_BLKID || end_blkid == DMU_SPILL_BLKID))
|
|
end_blkid = dn->dn_maxblkid;
|
|
dprintf_dnode(dn, "start=%llu end=%llu\n", (u_longlong_t)start_blkid,
|
|
(u_longlong_t)end_blkid);
|
|
|
|
db_search = kmem_alloc(sizeof (dmu_buf_impl_t), KM_SLEEP);
|
|
db_search->db_level = 0;
|
|
db_search->db_blkid = start_blkid;
|
|
db_search->db_state = DB_SEARCH;
|
|
|
|
mutex_enter(&dn->dn_dbufs_mtx);
|
|
db = avl_find(&dn->dn_dbufs, db_search, &where);
|
|
ASSERT3P(db, ==, NULL);
|
|
|
|
db = avl_nearest(&dn->dn_dbufs, where, AVL_AFTER);
|
|
|
|
for (; db != NULL; db = db_next) {
|
|
db_next = AVL_NEXT(&dn->dn_dbufs, db);
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
|
|
if (db->db_level != 0 || db->db_blkid > end_blkid) {
|
|
break;
|
|
}
|
|
ASSERT3U(db->db_blkid, >=, start_blkid);
|
|
|
|
/* found a level 0 buffer in the range */
|
|
mutex_enter(&db->db_mtx);
|
|
if (dbuf_undirty(db, tx)) {
|
|
/* mutex has been dropped and dbuf destroyed */
|
|
continue;
|
|
}
|
|
|
|
if (db->db_state == DB_UNCACHED ||
|
|
db->db_state == DB_NOFILL ||
|
|
db->db_state == DB_EVICTING) {
|
|
ASSERT(db->db.db_data == NULL);
|
|
mutex_exit(&db->db_mtx);
|
|
continue;
|
|
}
|
|
if (db->db_state == DB_READ || db->db_state == DB_FILL) {
|
|
/* will be handled in dbuf_read_done or dbuf_rele */
|
|
db->db_freed_in_flight = TRUE;
|
|
mutex_exit(&db->db_mtx);
|
|
continue;
|
|
}
|
|
if (zfs_refcount_count(&db->db_holds) == 0) {
|
|
ASSERT(db->db_buf);
|
|
dbuf_destroy(db);
|
|
continue;
|
|
}
|
|
/* The dbuf is referenced */
|
|
|
|
dr = list_head(&db->db_dirty_records);
|
|
if (dr != NULL) {
|
|
if (dr->dr_txg == txg) {
|
|
/*
|
|
* This buffer is "in-use", re-adjust the file
|
|
* size to reflect that this buffer may
|
|
* contain new data when we sync.
|
|
*/
|
|
if (db->db_blkid != DMU_SPILL_BLKID &&
|
|
db->db_blkid > dn->dn_maxblkid)
|
|
dn->dn_maxblkid = db->db_blkid;
|
|
dbuf_unoverride(dr);
|
|
} else {
|
|
/*
|
|
* This dbuf is not dirty in the open context.
|
|
* Either uncache it (if its not referenced in
|
|
* the open context) or reset its contents to
|
|
* empty.
|
|
*/
|
|
dbuf_fix_old_data(db, txg);
|
|
}
|
|
}
|
|
/* clear the contents if its cached */
|
|
if (db->db_state == DB_CACHED) {
|
|
ASSERT(db->db.db_data != NULL);
|
|
arc_release(db->db_buf, db);
|
|
rw_enter(&db->db_rwlock, RW_WRITER);
|
|
memset(db->db.db_data, 0, db->db.db_size);
|
|
rw_exit(&db->db_rwlock);
|
|
arc_buf_freeze(db->db_buf);
|
|
}
|
|
|
|
mutex_exit(&db->db_mtx);
|
|
}
|
|
|
|
mutex_exit(&dn->dn_dbufs_mtx);
|
|
kmem_free(db_search, sizeof (dmu_buf_impl_t));
|
|
}
|
|
|
|
void
|
|
dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx)
|
|
{
|
|
arc_buf_t *buf, *old_buf;
|
|
dbuf_dirty_record_t *dr;
|
|
int osize = db->db.db_size;
|
|
arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
|
|
dnode_t *dn;
|
|
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
|
|
DB_DNODE_ENTER(db);
|
|
dn = DB_DNODE(db);
|
|
|
|
/*
|
|
* XXX we should be doing a dbuf_read, checking the return
|
|
* value and returning that up to our callers
|
|
*/
|
|
dmu_buf_will_dirty(&db->db, tx);
|
|
|
|
/* create the data buffer for the new block */
|
|
buf = arc_alloc_buf(dn->dn_objset->os_spa, db, type, size);
|
|
|
|
/* copy old block data to the new block */
|
|
old_buf = db->db_buf;
|
|
memcpy(buf->b_data, old_buf->b_data, MIN(osize, size));
|
|
/* zero the remainder */
|
|
if (size > osize)
|
|
memset((uint8_t *)buf->b_data + osize, 0, size - osize);
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
dbuf_set_data(db, buf);
|
|
arc_buf_destroy(old_buf, db);
|
|
db->db.db_size = size;
|
|
|
|
dr = list_head(&db->db_dirty_records);
|
|
/* dirty record added by dmu_buf_will_dirty() */
|
|
VERIFY(dr != NULL);
|
|
if (db->db_level == 0)
|
|
dr->dt.dl.dr_data = buf;
|
|
ASSERT3U(dr->dr_txg, ==, tx->tx_txg);
|
|
ASSERT3U(dr->dr_accounted, ==, osize);
|
|
dr->dr_accounted = size;
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
dmu_objset_willuse_space(dn->dn_objset, size - osize, tx);
|
|
DB_DNODE_EXIT(db);
|
|
}
|
|
|
|
void
|
|
dbuf_release_bp(dmu_buf_impl_t *db)
|
|
{
|
|
objset_t *os __maybe_unused = db->db_objset;
|
|
|
|
ASSERT(dsl_pool_sync_context(dmu_objset_pool(os)));
|
|
ASSERT(arc_released(os->os_phys_buf) ||
|
|
list_link_active(&os->os_dsl_dataset->ds_synced_link));
|
|
ASSERT(db->db_parent == NULL || arc_released(db->db_parent->db_buf));
|
|
|
|
(void) arc_release(db->db_buf, db);
|
|
}
|
|
|
|
/*
|
|
* We already have a dirty record for this TXG, and we are being
|
|
* dirtied again.
|
|
*/
|
|
static void
|
|
dbuf_redirty(dbuf_dirty_record_t *dr)
|
|
{
|
|
dmu_buf_impl_t *db = dr->dr_dbuf;
|
|
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
|
|
if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) {
|
|
/*
|
|
* If this buffer has already been written out,
|
|
* we now need to reset its state.
|
|
*/
|
|
dbuf_unoverride(dr);
|
|
if (db->db.db_object != DMU_META_DNODE_OBJECT &&
|
|
db->db_state != DB_NOFILL) {
|
|
/* Already released on initial dirty, so just thaw. */
|
|
ASSERT(arc_released(db->db_buf));
|
|
arc_buf_thaw(db->db_buf);
|
|
}
|
|
}
|
|
}
|
|
|
|
dbuf_dirty_record_t *
|
|
dbuf_dirty_lightweight(dnode_t *dn, uint64_t blkid, dmu_tx_t *tx)
|
|
{
|
|
rw_enter(&dn->dn_struct_rwlock, RW_READER);
|
|
IMPLY(dn->dn_objset->os_raw_receive, dn->dn_maxblkid >= blkid);
|
|
dnode_new_blkid(dn, blkid, tx, B_TRUE, B_FALSE);
|
|
ASSERT(dn->dn_maxblkid >= blkid);
|
|
|
|
dbuf_dirty_record_t *dr = kmem_zalloc(sizeof (*dr), KM_SLEEP);
|
|
list_link_init(&dr->dr_dirty_node);
|
|
list_link_init(&dr->dr_dbuf_node);
|
|
dr->dr_dnode = dn;
|
|
dr->dr_txg = tx->tx_txg;
|
|
dr->dt.dll.dr_blkid = blkid;
|
|
dr->dr_accounted = dn->dn_datablksz;
|
|
|
|
/*
|
|
* There should not be any dbuf for the block that we're dirtying.
|
|
* Otherwise the buffer contents could be inconsistent between the
|
|
* dbuf and the lightweight dirty record.
|
|
*/
|
|
ASSERT3P(NULL, ==, dbuf_find(dn->dn_objset, dn->dn_object, 0, blkid,
|
|
NULL));
|
|
|
|
mutex_enter(&dn->dn_mtx);
|
|
int txgoff = tx->tx_txg & TXG_MASK;
|
|
if (dn->dn_free_ranges[txgoff] != NULL) {
|
|
range_tree_clear(dn->dn_free_ranges[txgoff], blkid, 1);
|
|
}
|
|
|
|
if (dn->dn_nlevels == 1) {
|
|
ASSERT3U(blkid, <, dn->dn_nblkptr);
|
|
list_insert_tail(&dn->dn_dirty_records[txgoff], dr);
|
|
mutex_exit(&dn->dn_mtx);
|
|
rw_exit(&dn->dn_struct_rwlock);
|
|
dnode_setdirty(dn, tx);
|
|
} else {
|
|
mutex_exit(&dn->dn_mtx);
|
|
|
|
int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
|
|
dmu_buf_impl_t *parent_db = dbuf_hold_level(dn,
|
|
1, blkid >> epbs, FTAG);
|
|
rw_exit(&dn->dn_struct_rwlock);
|
|
if (parent_db == NULL) {
|
|
kmem_free(dr, sizeof (*dr));
|
|
return (NULL);
|
|
}
|
|
int err = dbuf_read(parent_db, NULL,
|
|
(DB_RF_NOPREFETCH | DB_RF_CANFAIL));
|
|
if (err != 0) {
|
|
dbuf_rele(parent_db, FTAG);
|
|
kmem_free(dr, sizeof (*dr));
|
|
return (NULL);
|
|
}
|
|
|
|
dbuf_dirty_record_t *parent_dr = dbuf_dirty(parent_db, tx);
|
|
dbuf_rele(parent_db, FTAG);
|
|
mutex_enter(&parent_dr->dt.di.dr_mtx);
|
|
ASSERT3U(parent_dr->dr_txg, ==, tx->tx_txg);
|
|
list_insert_tail(&parent_dr->dt.di.dr_children, dr);
|
|
mutex_exit(&parent_dr->dt.di.dr_mtx);
|
|
dr->dr_parent = parent_dr;
|
|
}
|
|
|
|
dmu_objset_willuse_space(dn->dn_objset, dr->dr_accounted, tx);
|
|
|
|
return (dr);
|
|
}
|
|
|
|
dbuf_dirty_record_t *
|
|
dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx)
|
|
{
|
|
dnode_t *dn;
|
|
objset_t *os;
|
|
dbuf_dirty_record_t *dr, *dr_next, *dr_head;
|
|
int txgoff = tx->tx_txg & TXG_MASK;
|
|
boolean_t drop_struct_rwlock = B_FALSE;
|
|
|
|
ASSERT(tx->tx_txg != 0);
|
|
ASSERT(!zfs_refcount_is_zero(&db->db_holds));
|
|
DMU_TX_DIRTY_BUF(tx, db);
|
|
|
|
DB_DNODE_ENTER(db);
|
|
dn = DB_DNODE(db);
|
|
/*
|
|
* Shouldn't dirty a regular buffer in syncing context. Private
|
|
* objects may be dirtied in syncing context, but only if they
|
|
* were already pre-dirtied in open context.
|
|
*/
|
|
#ifdef ZFS_DEBUG
|
|
if (dn->dn_objset->os_dsl_dataset != NULL) {
|
|
rrw_enter(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock,
|
|
RW_READER, FTAG);
|
|
}
|
|
ASSERT(!dmu_tx_is_syncing(tx) ||
|
|
BP_IS_HOLE(dn->dn_objset->os_rootbp) ||
|
|
DMU_OBJECT_IS_SPECIAL(dn->dn_object) ||
|
|
dn->dn_objset->os_dsl_dataset == NULL);
|
|
if (dn->dn_objset->os_dsl_dataset != NULL)
|
|
rrw_exit(&dn->dn_objset->os_dsl_dataset->ds_bp_rwlock, FTAG);
|
|
#endif
|
|
/*
|
|
* We make this assert for private objects as well, but after we
|
|
* check if we're already dirty. They are allowed to re-dirty
|
|
* in syncing context.
|
|
*/
|
|
ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT ||
|
|
dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx ==
|
|
(dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN));
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
/*
|
|
* XXX make this true for indirects too? The problem is that
|
|
* transactions created with dmu_tx_create_assigned() from
|
|
* syncing context don't bother holding ahead.
|
|
*/
|
|
ASSERT(db->db_level != 0 ||
|
|
db->db_state == DB_CACHED || db->db_state == DB_FILL ||
|
|
db->db_state == DB_NOFILL);
|
|
|
|
mutex_enter(&dn->dn_mtx);
|
|
dnode_set_dirtyctx(dn, tx, db);
|
|
if (tx->tx_txg > dn->dn_dirty_txg)
|
|
dn->dn_dirty_txg = tx->tx_txg;
|
|
mutex_exit(&dn->dn_mtx);
|
|
|
|
if (db->db_blkid == DMU_SPILL_BLKID)
|
|
dn->dn_have_spill = B_TRUE;
|
|
|
|
/*
|
|
* If this buffer is already dirty, we're done.
|
|
*/
|
|
dr_head = list_head(&db->db_dirty_records);
|
|
ASSERT(dr_head == NULL || dr_head->dr_txg <= tx->tx_txg ||
|
|
db->db.db_object == DMU_META_DNODE_OBJECT);
|
|
dr_next = dbuf_find_dirty_lte(db, tx->tx_txg);
|
|
if (dr_next && dr_next->dr_txg == tx->tx_txg) {
|
|
DB_DNODE_EXIT(db);
|
|
|
|
dbuf_redirty(dr_next);
|
|
mutex_exit(&db->db_mtx);
|
|
return (dr_next);
|
|
}
|
|
|
|
/*
|
|
* Only valid if not already dirty.
|
|
*/
|
|
ASSERT(dn->dn_object == 0 ||
|
|
dn->dn_dirtyctx == DN_UNDIRTIED || dn->dn_dirtyctx ==
|
|
(dmu_tx_is_syncing(tx) ? DN_DIRTY_SYNC : DN_DIRTY_OPEN));
|
|
|
|
ASSERT3U(dn->dn_nlevels, >, db->db_level);
|
|
|
|
/*
|
|
* We should only be dirtying in syncing context if it's the
|
|
* mos or we're initializing the os or it's a special object.
|
|
* However, we are allowed to dirty in syncing context provided
|
|
* we already dirtied it in open context. Hence we must make
|
|
* this assertion only if we're not already dirty.
|
|
*/
|
|
os = dn->dn_objset;
|
|
VERIFY3U(tx->tx_txg, <=, spa_final_dirty_txg(os->os_spa));
|
|
#ifdef ZFS_DEBUG
|
|
if (dn->dn_objset->os_dsl_dataset != NULL)
|
|
rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_READER, FTAG);
|
|
ASSERT(!dmu_tx_is_syncing(tx) || DMU_OBJECT_IS_SPECIAL(dn->dn_object) ||
|
|
os->os_dsl_dataset == NULL || BP_IS_HOLE(os->os_rootbp));
|
|
if (dn->dn_objset->os_dsl_dataset != NULL)
|
|
rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG);
|
|
#endif
|
|
ASSERT(db->db.db_size != 0);
|
|
|
|
dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size);
|
|
|
|
if (db->db_blkid != DMU_BONUS_BLKID && db->db_state != DB_NOFILL) {
|
|
dmu_objset_willuse_space(os, db->db.db_size, tx);
|
|
}
|
|
|
|
/*
|
|
* If this buffer is dirty in an old transaction group we need
|
|
* to make a copy of it so that the changes we make in this
|
|
* transaction group won't leak out when we sync the older txg.
|
|
*/
|
|
dr = kmem_zalloc(sizeof (dbuf_dirty_record_t), KM_SLEEP);
|
|
list_link_init(&dr->dr_dirty_node);
|
|
list_link_init(&dr->dr_dbuf_node);
|
|
dr->dr_dnode = dn;
|
|
if (db->db_level == 0) {
|
|
void *data_old = db->db_buf;
|
|
|
|
if (db->db_state != DB_NOFILL) {
|
|
if (db->db_blkid == DMU_BONUS_BLKID) {
|
|
dbuf_fix_old_data(db, tx->tx_txg);
|
|
data_old = db->db.db_data;
|
|
} else if (db->db.db_object != DMU_META_DNODE_OBJECT) {
|
|
/*
|
|
* Release the data buffer from the cache so
|
|
* that we can modify it without impacting
|
|
* possible other users of this cached data
|
|
* block. Note that indirect blocks and
|
|
* private objects are not released until the
|
|
* syncing state (since they are only modified
|
|
* then).
|
|
*/
|
|
arc_release(db->db_buf, db);
|
|
dbuf_fix_old_data(db, tx->tx_txg);
|
|
data_old = db->db_buf;
|
|
}
|
|
ASSERT(data_old != NULL);
|
|
}
|
|
dr->dt.dl.dr_data = data_old;
|
|
} else {
|
|
mutex_init(&dr->dt.di.dr_mtx, NULL, MUTEX_NOLOCKDEP, NULL);
|
|
list_create(&dr->dt.di.dr_children,
|
|
sizeof (dbuf_dirty_record_t),
|
|
offsetof(dbuf_dirty_record_t, dr_dirty_node));
|
|
}
|
|
if (db->db_blkid != DMU_BONUS_BLKID && db->db_state != DB_NOFILL) {
|
|
dr->dr_accounted = db->db.db_size;
|
|
}
|
|
dr->dr_dbuf = db;
|
|
dr->dr_txg = tx->tx_txg;
|
|
list_insert_before(&db->db_dirty_records, dr_next, dr);
|
|
|
|
/*
|
|
* We could have been freed_in_flight between the dbuf_noread
|
|
* and dbuf_dirty. We win, as though the dbuf_noread() had
|
|
* happened after the free.
|
|
*/
|
|
if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID &&
|
|
db->db_blkid != DMU_SPILL_BLKID) {
|
|
mutex_enter(&dn->dn_mtx);
|
|
if (dn->dn_free_ranges[txgoff] != NULL) {
|
|
range_tree_clear(dn->dn_free_ranges[txgoff],
|
|
db->db_blkid, 1);
|
|
}
|
|
mutex_exit(&dn->dn_mtx);
|
|
db->db_freed_in_flight = FALSE;
|
|
}
|
|
|
|
/*
|
|
* This buffer is now part of this txg
|
|
*/
|
|
dbuf_add_ref(db, (void *)(uintptr_t)tx->tx_txg);
|
|
db->db_dirtycnt += 1;
|
|
ASSERT3U(db->db_dirtycnt, <=, 3);
|
|
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
if (db->db_blkid == DMU_BONUS_BLKID ||
|
|
db->db_blkid == DMU_SPILL_BLKID) {
|
|
mutex_enter(&dn->dn_mtx);
|
|
ASSERT(!list_link_active(&dr->dr_dirty_node));
|
|
list_insert_tail(&dn->dn_dirty_records[txgoff], dr);
|
|
mutex_exit(&dn->dn_mtx);
|
|
dnode_setdirty(dn, tx);
|
|
DB_DNODE_EXIT(db);
|
|
return (dr);
|
|
}
|
|
|
|
if (!RW_WRITE_HELD(&dn->dn_struct_rwlock)) {
|
|
rw_enter(&dn->dn_struct_rwlock, RW_READER);
|
|
drop_struct_rwlock = B_TRUE;
|
|
}
|
|
|
|
/*
|
|
* If we are overwriting a dedup BP, then unless it is snapshotted,
|
|
* when we get to syncing context we will need to decrement its
|
|
* refcount in the DDT. Prefetch the relevant DDT block so that
|
|
* syncing context won't have to wait for the i/o.
|
|
*/
|
|
if (db->db_blkptr != NULL) {
|
|
db_lock_type_t dblt = dmu_buf_lock_parent(db, RW_READER, FTAG);
|
|
ddt_prefetch(os->os_spa, db->db_blkptr);
|
|
dmu_buf_unlock_parent(db, dblt, FTAG);
|
|
}
|
|
|
|
/*
|
|
* We need to hold the dn_struct_rwlock to make this assertion,
|
|
* because it protects dn_phys / dn_next_nlevels from changing.
|
|
*/
|
|
ASSERT((dn->dn_phys->dn_nlevels == 0 && db->db_level == 0) ||
|
|
dn->dn_phys->dn_nlevels > db->db_level ||
|
|
dn->dn_next_nlevels[txgoff] > db->db_level ||
|
|
dn->dn_next_nlevels[(tx->tx_txg-1) & TXG_MASK] > db->db_level ||
|
|
dn->dn_next_nlevels[(tx->tx_txg-2) & TXG_MASK] > db->db_level);
|
|
|
|
|
|
if (db->db_level == 0) {
|
|
ASSERT(!db->db_objset->os_raw_receive ||
|
|
dn->dn_maxblkid >= db->db_blkid);
|
|
dnode_new_blkid(dn, db->db_blkid, tx,
|
|
drop_struct_rwlock, B_FALSE);
|
|
ASSERT(dn->dn_maxblkid >= db->db_blkid);
|
|
}
|
|
|
|
if (db->db_level+1 < dn->dn_nlevels) {
|
|
dmu_buf_impl_t *parent = db->db_parent;
|
|
dbuf_dirty_record_t *di;
|
|
int parent_held = FALSE;
|
|
|
|
if (db->db_parent == NULL || db->db_parent == dn->dn_dbuf) {
|
|
int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
|
|
parent = dbuf_hold_level(dn, db->db_level + 1,
|
|
db->db_blkid >> epbs, FTAG);
|
|
ASSERT(parent != NULL);
|
|
parent_held = TRUE;
|
|
}
|
|
if (drop_struct_rwlock)
|
|
rw_exit(&dn->dn_struct_rwlock);
|
|
ASSERT3U(db->db_level + 1, ==, parent->db_level);
|
|
di = dbuf_dirty(parent, tx);
|
|
if (parent_held)
|
|
dbuf_rele(parent, FTAG);
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
/*
|
|
* Since we've dropped the mutex, it's possible that
|
|
* dbuf_undirty() might have changed this out from under us.
|
|
*/
|
|
if (list_head(&db->db_dirty_records) == dr ||
|
|
dn->dn_object == DMU_META_DNODE_OBJECT) {
|
|
mutex_enter(&di->dt.di.dr_mtx);
|
|
ASSERT3U(di->dr_txg, ==, tx->tx_txg);
|
|
ASSERT(!list_link_active(&dr->dr_dirty_node));
|
|
list_insert_tail(&di->dt.di.dr_children, dr);
|
|
mutex_exit(&di->dt.di.dr_mtx);
|
|
dr->dr_parent = di;
|
|
}
|
|
mutex_exit(&db->db_mtx);
|
|
} else {
|
|
ASSERT(db->db_level + 1 == dn->dn_nlevels);
|
|
ASSERT(db->db_blkid < dn->dn_nblkptr);
|
|
ASSERT(db->db_parent == NULL || db->db_parent == dn->dn_dbuf);
|
|
mutex_enter(&dn->dn_mtx);
|
|
ASSERT(!list_link_active(&dr->dr_dirty_node));
|
|
list_insert_tail(&dn->dn_dirty_records[txgoff], dr);
|
|
mutex_exit(&dn->dn_mtx);
|
|
if (drop_struct_rwlock)
|
|
rw_exit(&dn->dn_struct_rwlock);
|
|
}
|
|
|
|
dnode_setdirty(dn, tx);
|
|
DB_DNODE_EXIT(db);
|
|
return (dr);
|
|
}
|
|
|
|
static void
|
|
dbuf_undirty_bonus(dbuf_dirty_record_t *dr)
|
|
{
|
|
dmu_buf_impl_t *db = dr->dr_dbuf;
|
|
|
|
if (dr->dt.dl.dr_data != db->db.db_data) {
|
|
struct dnode *dn = dr->dr_dnode;
|
|
int max_bonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
|
|
|
|
kmem_free(dr->dt.dl.dr_data, max_bonuslen);
|
|
arc_space_return(max_bonuslen, ARC_SPACE_BONUS);
|
|
}
|
|
db->db_data_pending = NULL;
|
|
ASSERT(list_next(&db->db_dirty_records, dr) == NULL);
|
|
list_remove(&db->db_dirty_records, dr);
|
|
if (dr->dr_dbuf->db_level != 0) {
|
|
mutex_destroy(&dr->dt.di.dr_mtx);
|
|
list_destroy(&dr->dt.di.dr_children);
|
|
}
|
|
kmem_free(dr, sizeof (dbuf_dirty_record_t));
|
|
ASSERT3U(db->db_dirtycnt, >, 0);
|
|
db->db_dirtycnt -= 1;
|
|
}
|
|
|
|
/*
|
|
* Undirty a buffer in the transaction group referenced by the given
|
|
* transaction. Return whether this evicted the dbuf.
|
|
*/
|
|
boolean_t
|
|
dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx)
|
|
{
|
|
uint64_t txg = tx->tx_txg;
|
|
boolean_t brtwrite;
|
|
|
|
ASSERT(txg != 0);
|
|
|
|
/*
|
|
* Due to our use of dn_nlevels below, this can only be called
|
|
* in open context, unless we are operating on the MOS.
|
|
* From syncing context, dn_nlevels may be different from the
|
|
* dn_nlevels used when dbuf was dirtied.
|
|
*/
|
|
ASSERT(db->db_objset ==
|
|
dmu_objset_pool(db->db_objset)->dp_meta_objset ||
|
|
txg != spa_syncing_txg(dmu_objset_spa(db->db_objset)));
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
ASSERT0(db->db_level);
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
|
|
/*
|
|
* If this buffer is not dirty, we're done.
|
|
*/
|
|
dbuf_dirty_record_t *dr = dbuf_find_dirty_eq(db, txg);
|
|
if (dr == NULL)
|
|
return (B_FALSE);
|
|
ASSERT(dr->dr_dbuf == db);
|
|
|
|
brtwrite = dr->dt.dl.dr_brtwrite;
|
|
if (brtwrite) {
|
|
/*
|
|
* We are freeing a block that we cloned in the same
|
|
* transaction group.
|
|
*/
|
|
brt_pending_remove(dmu_objset_spa(db->db_objset),
|
|
&dr->dt.dl.dr_overridden_by, tx);
|
|
}
|
|
|
|
dnode_t *dn = dr->dr_dnode;
|
|
|
|
dprintf_dbuf(db, "size=%llx\n", (u_longlong_t)db->db.db_size);
|
|
|
|
ASSERT(db->db.db_size != 0);
|
|
|
|
dsl_pool_undirty_space(dmu_objset_pool(dn->dn_objset),
|
|
dr->dr_accounted, txg);
|
|
|
|
list_remove(&db->db_dirty_records, dr);
|
|
|
|
/*
|
|
* Note that there are three places in dbuf_dirty()
|
|
* where this dirty record may be put on a list.
|
|
* Make sure to do a list_remove corresponding to
|
|
* every one of those list_insert calls.
|
|
*/
|
|
if (dr->dr_parent) {
|
|
mutex_enter(&dr->dr_parent->dt.di.dr_mtx);
|
|
list_remove(&dr->dr_parent->dt.di.dr_children, dr);
|
|
mutex_exit(&dr->dr_parent->dt.di.dr_mtx);
|
|
} else if (db->db_blkid == DMU_SPILL_BLKID ||
|
|
db->db_level + 1 == dn->dn_nlevels) {
|
|
ASSERT(db->db_blkptr == NULL || db->db_parent == dn->dn_dbuf);
|
|
mutex_enter(&dn->dn_mtx);
|
|
list_remove(&dn->dn_dirty_records[txg & TXG_MASK], dr);
|
|
mutex_exit(&dn->dn_mtx);
|
|
}
|
|
|
|
if (db->db_state != DB_NOFILL && !brtwrite) {
|
|
dbuf_unoverride(dr);
|
|
|
|
ASSERT(db->db_buf != NULL);
|
|
ASSERT(dr->dt.dl.dr_data != NULL);
|
|
if (dr->dt.dl.dr_data != db->db_buf)
|
|
arc_buf_destroy(dr->dt.dl.dr_data, db);
|
|
}
|
|
|
|
kmem_free(dr, sizeof (dbuf_dirty_record_t));
|
|
|
|
ASSERT(db->db_dirtycnt > 0);
|
|
db->db_dirtycnt -= 1;
|
|
|
|
if (zfs_refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) {
|
|
ASSERT(db->db_state == DB_NOFILL || brtwrite ||
|
|
arc_released(db->db_buf));
|
|
dbuf_destroy(db);
|
|
return (B_TRUE);
|
|
}
|
|
|
|
return (B_FALSE);
|
|
}
|
|
|
|
static void
|
|
dmu_buf_will_dirty_impl(dmu_buf_t *db_fake, int flags, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
boolean_t undirty = B_FALSE;
|
|
|
|
ASSERT(tx->tx_txg != 0);
|
|
ASSERT(!zfs_refcount_is_zero(&db->db_holds));
|
|
|
|
/*
|
|
* Quick check for dirtiness. For already dirty blocks, this
|
|
* reduces runtime of this function by >90%, and overall performance
|
|
* by 50% for some workloads (e.g. file deletion with indirect blocks
|
|
* cached).
|
|
*/
|
|
mutex_enter(&db->db_mtx);
|
|
|
|
if (db->db_state == DB_CACHED || db->db_state == DB_NOFILL) {
|
|
dbuf_dirty_record_t *dr = dbuf_find_dirty_eq(db, tx->tx_txg);
|
|
/*
|
|
* It's possible that it is already dirty but not cached,
|
|
* because there are some calls to dbuf_dirty() that don't
|
|
* go through dmu_buf_will_dirty().
|
|
*/
|
|
if (dr != NULL) {
|
|
if (dr->dt.dl.dr_brtwrite) {
|
|
/*
|
|
* Block cloning: If we are dirtying a cloned
|
|
* block, we cannot simply redirty it, because
|
|
* this dr has no data associated with it.
|
|
* We will go through a full undirtying below,
|
|
* before dirtying it again.
|
|
*/
|
|
undirty = B_TRUE;
|
|
} else {
|
|
/* This dbuf is already dirty and cached. */
|
|
dbuf_redirty(dr);
|
|
mutex_exit(&db->db_mtx);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
DB_DNODE_ENTER(db);
|
|
if (RW_WRITE_HELD(&DB_DNODE(db)->dn_struct_rwlock))
|
|
flags |= DB_RF_HAVESTRUCT;
|
|
DB_DNODE_EXIT(db);
|
|
|
|
/*
|
|
* Block cloning: Do the dbuf_read() before undirtying the dbuf, as we
|
|
* want to make sure dbuf_read() will read the pending cloned block and
|
|
* not the uderlying block that is being replaced. dbuf_undirty() will
|
|
* do dbuf_unoverride(), so we will end up with cloned block content,
|
|
* without overridden BP.
|
|
*/
|
|
(void) dbuf_read(db, NULL, flags);
|
|
if (undirty) {
|
|
mutex_enter(&db->db_mtx);
|
|
VERIFY(!dbuf_undirty(db, tx));
|
|
mutex_exit(&db->db_mtx);
|
|
}
|
|
(void) dbuf_dirty(db, tx);
|
|
}
|
|
|
|
void
|
|
dmu_buf_will_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_will_dirty_impl(db_fake,
|
|
DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH, tx);
|
|
}
|
|
|
|
boolean_t
|
|
dmu_buf_is_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
dbuf_dirty_record_t *dr;
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
dr = dbuf_find_dirty_eq(db, tx->tx_txg);
|
|
mutex_exit(&db->db_mtx);
|
|
return (dr != NULL);
|
|
}
|
|
|
|
void
|
|
dmu_buf_will_clone(dmu_buf_t *db_fake, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
|
|
/*
|
|
* Block cloning: We are going to clone into this block, so undirty
|
|
* modifications done to this block so far in this txg. This includes
|
|
* writes and clones into this block.
|
|
*/
|
|
mutex_enter(&db->db_mtx);
|
|
VERIFY(!dbuf_undirty(db, tx));
|
|
ASSERT3P(dbuf_find_dirty_eq(db, tx->tx_txg), ==, NULL);
|
|
if (db->db_buf != NULL) {
|
|
arc_buf_destroy(db->db_buf, db);
|
|
db->db_buf = NULL;
|
|
}
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
dmu_buf_will_not_fill(db_fake, tx);
|
|
}
|
|
|
|
void
|
|
dmu_buf_will_not_fill(dmu_buf_t *db_fake, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
db->db_state = DB_NOFILL;
|
|
DTRACE_SET_STATE(db, "allocating NOFILL buffer");
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
dbuf_noread(db);
|
|
(void) dbuf_dirty(db, tx);
|
|
}
|
|
|
|
void
|
|
dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
ASSERT(tx->tx_txg != 0);
|
|
ASSERT(db->db_level == 0);
|
|
ASSERT(!zfs_refcount_is_zero(&db->db_holds));
|
|
|
|
ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT ||
|
|
dmu_tx_private_ok(tx));
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
if (db->db_state == DB_NOFILL) {
|
|
/*
|
|
* Block cloning: We will be completely overwriting a block
|
|
* cloned in this transaction group, so let's undirty the
|
|
* pending clone and mark the block as uncached. This will be
|
|
* as if the clone was never done.
|
|
*/
|
|
VERIFY(!dbuf_undirty(db, tx));
|
|
db->db_state = DB_UNCACHED;
|
|
}
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
dbuf_noread(db);
|
|
(void) dbuf_dirty(db, tx);
|
|
}
|
|
|
|
/*
|
|
* This function is effectively the same as dmu_buf_will_dirty(), but
|
|
* indicates the caller expects raw encrypted data in the db, and provides
|
|
* the crypt params (byteorder, salt, iv, mac) which should be stored in the
|
|
* blkptr_t when this dbuf is written. This is only used for blocks of
|
|
* dnodes, during raw receive.
|
|
*/
|
|
void
|
|
dmu_buf_set_crypt_params(dmu_buf_t *db_fake, boolean_t byteorder,
|
|
const uint8_t *salt, const uint8_t *iv, const uint8_t *mac, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
dbuf_dirty_record_t *dr;
|
|
|
|
/*
|
|
* dr_has_raw_params is only processed for blocks of dnodes
|
|
* (see dbuf_sync_dnode_leaf_crypt()).
|
|
*/
|
|
ASSERT3U(db->db.db_object, ==, DMU_META_DNODE_OBJECT);
|
|
ASSERT3U(db->db_level, ==, 0);
|
|
ASSERT(db->db_objset->os_raw_receive);
|
|
|
|
dmu_buf_will_dirty_impl(db_fake,
|
|
DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH | DB_RF_NO_DECRYPT, tx);
|
|
|
|
dr = dbuf_find_dirty_eq(db, tx->tx_txg);
|
|
|
|
ASSERT3P(dr, !=, NULL);
|
|
|
|
dr->dt.dl.dr_has_raw_params = B_TRUE;
|
|
dr->dt.dl.dr_byteorder = byteorder;
|
|
memcpy(dr->dt.dl.dr_salt, salt, ZIO_DATA_SALT_LEN);
|
|
memcpy(dr->dt.dl.dr_iv, iv, ZIO_DATA_IV_LEN);
|
|
memcpy(dr->dt.dl.dr_mac, mac, ZIO_DATA_MAC_LEN);
|
|
}
|
|
|
|
static void
|
|
dbuf_override_impl(dmu_buf_impl_t *db, const blkptr_t *bp, dmu_tx_t *tx)
|
|
{
|
|
struct dirty_leaf *dl;
|
|
dbuf_dirty_record_t *dr;
|
|
|
|
dr = list_head(&db->db_dirty_records);
|
|
ASSERT3P(dr, !=, NULL);
|
|
ASSERT3U(dr->dr_txg, ==, tx->tx_txg);
|
|
dl = &dr->dt.dl;
|
|
dl->dr_overridden_by = *bp;
|
|
dl->dr_override_state = DR_OVERRIDDEN;
|
|
dl->dr_overridden_by.blk_birth = dr->dr_txg;
|
|
}
|
|
|
|
void
|
|
dmu_buf_fill_done(dmu_buf_t *dbuf, dmu_tx_t *tx)
|
|
{
|
|
(void) tx;
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf;
|
|
dbuf_states_t old_state;
|
|
mutex_enter(&db->db_mtx);
|
|
DBUF_VERIFY(db);
|
|
|
|
old_state = db->db_state;
|
|
db->db_state = DB_CACHED;
|
|
if (old_state == DB_FILL) {
|
|
if (db->db_level == 0 && db->db_freed_in_flight) {
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
/* we were freed while filling */
|
|
/* XXX dbuf_undirty? */
|
|
memset(db->db.db_data, 0, db->db.db_size);
|
|
db->db_freed_in_flight = FALSE;
|
|
DTRACE_SET_STATE(db,
|
|
"fill done handling freed in flight");
|
|
} else {
|
|
DTRACE_SET_STATE(db, "fill done");
|
|
}
|
|
cv_broadcast(&db->db_changed);
|
|
}
|
|
mutex_exit(&db->db_mtx);
|
|
}
|
|
|
|
void
|
|
dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data,
|
|
bp_embedded_type_t etype, enum zio_compress comp,
|
|
int uncompressed_size, int compressed_size, int byteorder,
|
|
dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf;
|
|
struct dirty_leaf *dl;
|
|
dmu_object_type_t type;
|
|
dbuf_dirty_record_t *dr;
|
|
|
|
if (etype == BP_EMBEDDED_TYPE_DATA) {
|
|
ASSERT(spa_feature_is_active(dmu_objset_spa(db->db_objset),
|
|
SPA_FEATURE_EMBEDDED_DATA));
|
|
}
|
|
|
|
DB_DNODE_ENTER(db);
|
|
type = DB_DNODE(db)->dn_type;
|
|
DB_DNODE_EXIT(db);
|
|
|
|
ASSERT0(db->db_level);
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
|
|
dmu_buf_will_not_fill(dbuf, tx);
|
|
|
|
dr = list_head(&db->db_dirty_records);
|
|
ASSERT3P(dr, !=, NULL);
|
|
ASSERT3U(dr->dr_txg, ==, tx->tx_txg);
|
|
dl = &dr->dt.dl;
|
|
encode_embedded_bp_compressed(&dl->dr_overridden_by,
|
|
data, comp, uncompressed_size, compressed_size);
|
|
BPE_SET_ETYPE(&dl->dr_overridden_by, etype);
|
|
BP_SET_TYPE(&dl->dr_overridden_by, type);
|
|
BP_SET_LEVEL(&dl->dr_overridden_by, 0);
|
|
BP_SET_BYTEORDER(&dl->dr_overridden_by, byteorder);
|
|
|
|
dl->dr_override_state = DR_OVERRIDDEN;
|
|
dl->dr_overridden_by.blk_birth = dr->dr_txg;
|
|
}
|
|
|
|
void
|
|
dmu_buf_redact(dmu_buf_t *dbuf, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)dbuf;
|
|
dmu_object_type_t type;
|
|
ASSERT(dsl_dataset_feature_is_active(db->db_objset->os_dsl_dataset,
|
|
SPA_FEATURE_REDACTED_DATASETS));
|
|
|
|
DB_DNODE_ENTER(db);
|
|
type = DB_DNODE(db)->dn_type;
|
|
DB_DNODE_EXIT(db);
|
|
|
|
ASSERT0(db->db_level);
|
|
dmu_buf_will_not_fill(dbuf, tx);
|
|
|
|
blkptr_t bp = { { { {0} } } };
|
|
BP_SET_TYPE(&bp, type);
|
|
BP_SET_LEVEL(&bp, 0);
|
|
BP_SET_BIRTH(&bp, tx->tx_txg, 0);
|
|
BP_SET_REDACTED(&bp);
|
|
BPE_SET_LSIZE(&bp, dbuf->db_size);
|
|
|
|
dbuf_override_impl(db, &bp, tx);
|
|
}
|
|
|
|
/*
|
|
* Directly assign a provided arc buf to a given dbuf if it's not referenced
|
|
* by anybody except our caller. Otherwise copy arcbuf's contents to dbuf.
|
|
*/
|
|
void
|
|
dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx)
|
|
{
|
|
ASSERT(!zfs_refcount_is_zero(&db->db_holds));
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
ASSERT(db->db_level == 0);
|
|
ASSERT3U(dbuf_is_metadata(db), ==, arc_is_metadata(buf));
|
|
ASSERT(buf != NULL);
|
|
ASSERT3U(arc_buf_lsize(buf), ==, db->db.db_size);
|
|
ASSERT(tx->tx_txg != 0);
|
|
|
|
arc_return_buf(buf, db);
|
|
ASSERT(arc_released(buf));
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
|
|
while (db->db_state == DB_READ || db->db_state == DB_FILL)
|
|
cv_wait(&db->db_changed, &db->db_mtx);
|
|
|
|
ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED);
|
|
|
|
if (db->db_state == DB_CACHED &&
|
|
zfs_refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) {
|
|
/*
|
|
* In practice, we will never have a case where we have an
|
|
* encrypted arc buffer while additional holds exist on the
|
|
* dbuf. We don't handle this here so we simply assert that
|
|
* fact instead.
|
|
*/
|
|
ASSERT(!arc_is_encrypted(buf));
|
|
mutex_exit(&db->db_mtx);
|
|
(void) dbuf_dirty(db, tx);
|
|
memcpy(db->db.db_data, buf->b_data, db->db.db_size);
|
|
arc_buf_destroy(buf, db);
|
|
return;
|
|
}
|
|
|
|
if (db->db_state == DB_CACHED) {
|
|
dbuf_dirty_record_t *dr = list_head(&db->db_dirty_records);
|
|
|
|
ASSERT(db->db_buf != NULL);
|
|
if (dr != NULL && dr->dr_txg == tx->tx_txg) {
|
|
ASSERT(dr->dt.dl.dr_data == db->db_buf);
|
|
|
|
if (!arc_released(db->db_buf)) {
|
|
ASSERT(dr->dt.dl.dr_override_state ==
|
|
DR_OVERRIDDEN);
|
|
arc_release(db->db_buf, db);
|
|
}
|
|
dr->dt.dl.dr_data = buf;
|
|
arc_buf_destroy(db->db_buf, db);
|
|
} else if (dr == NULL || dr->dt.dl.dr_data != db->db_buf) {
|
|
arc_release(db->db_buf, db);
|
|
arc_buf_destroy(db->db_buf, db);
|
|
}
|
|
db->db_buf = NULL;
|
|
}
|
|
ASSERT(db->db_buf == NULL);
|
|
dbuf_set_data(db, buf);
|
|
db->db_state = DB_FILL;
|
|
DTRACE_SET_STATE(db, "filling assigned arcbuf");
|
|
mutex_exit(&db->db_mtx);
|
|
(void) dbuf_dirty(db, tx);
|
|
dmu_buf_fill_done(&db->db, tx);
|
|
}
|
|
|
|
void
|
|
dbuf_destroy(dmu_buf_impl_t *db)
|
|
{
|
|
dnode_t *dn;
|
|
dmu_buf_impl_t *parent = db->db_parent;
|
|
dmu_buf_impl_t *dndb;
|
|
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
ASSERT(zfs_refcount_is_zero(&db->db_holds));
|
|
|
|
if (db->db_buf != NULL) {
|
|
arc_buf_destroy(db->db_buf, db);
|
|
db->db_buf = NULL;
|
|
}
|
|
|
|
if (db->db_blkid == DMU_BONUS_BLKID) {
|
|
int slots = DB_DNODE(db)->dn_num_slots;
|
|
int bonuslen = DN_SLOTS_TO_BONUSLEN(slots);
|
|
if (db->db.db_data != NULL) {
|
|
kmem_free(db->db.db_data, bonuslen);
|
|
arc_space_return(bonuslen, ARC_SPACE_BONUS);
|
|
db->db_state = DB_UNCACHED;
|
|
DTRACE_SET_STATE(db, "buffer cleared");
|
|
}
|
|
}
|
|
|
|
dbuf_clear_data(db);
|
|
|
|
if (multilist_link_active(&db->db_cache_link)) {
|
|
ASSERT(db->db_caching_status == DB_DBUF_CACHE ||
|
|
db->db_caching_status == DB_DBUF_METADATA_CACHE);
|
|
|
|
multilist_remove(&dbuf_caches[db->db_caching_status].cache, db);
|
|
(void) zfs_refcount_remove_many(
|
|
&dbuf_caches[db->db_caching_status].size,
|
|
db->db.db_size, db);
|
|
|
|
if (db->db_caching_status == DB_DBUF_METADATA_CACHE) {
|
|
DBUF_STAT_BUMPDOWN(metadata_cache_count);
|
|
} else {
|
|
DBUF_STAT_BUMPDOWN(cache_levels[db->db_level]);
|
|
DBUF_STAT_BUMPDOWN(cache_count);
|
|
DBUF_STAT_DECR(cache_levels_bytes[db->db_level],
|
|
db->db.db_size);
|
|
}
|
|
db->db_caching_status = DB_NO_CACHE;
|
|
}
|
|
|
|
ASSERT(db->db_state == DB_UNCACHED || db->db_state == DB_NOFILL);
|
|
ASSERT(db->db_data_pending == NULL);
|
|
ASSERT(list_is_empty(&db->db_dirty_records));
|
|
|
|
db->db_state = DB_EVICTING;
|
|
DTRACE_SET_STATE(db, "buffer eviction started");
|
|
db->db_blkptr = NULL;
|
|
|
|
/*
|
|
* Now that db_state is DB_EVICTING, nobody else can find this via
|
|
* the hash table. We can now drop db_mtx, which allows us to
|
|
* acquire the dn_dbufs_mtx.
|
|
*/
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
DB_DNODE_ENTER(db);
|
|
dn = DB_DNODE(db);
|
|
dndb = dn->dn_dbuf;
|
|
if (db->db_blkid != DMU_BONUS_BLKID) {
|
|
boolean_t needlock = !MUTEX_HELD(&dn->dn_dbufs_mtx);
|
|
if (needlock)
|
|
mutex_enter_nested(&dn->dn_dbufs_mtx,
|
|
NESTED_SINGLE);
|
|
avl_remove(&dn->dn_dbufs, db);
|
|
membar_producer();
|
|
DB_DNODE_EXIT(db);
|
|
if (needlock)
|
|
mutex_exit(&dn->dn_dbufs_mtx);
|
|
/*
|
|
* Decrementing the dbuf count means that the hold corresponding
|
|
* to the removed dbuf is no longer discounted in dnode_move(),
|
|
* so the dnode cannot be moved until after we release the hold.
|
|
* The membar_producer() ensures visibility of the decremented
|
|
* value in dnode_move(), since DB_DNODE_EXIT doesn't actually
|
|
* release any lock.
|
|
*/
|
|
mutex_enter(&dn->dn_mtx);
|
|
dnode_rele_and_unlock(dn, db, B_TRUE);
|
|
db->db_dnode_handle = NULL;
|
|
|
|
dbuf_hash_remove(db);
|
|
} else {
|
|
DB_DNODE_EXIT(db);
|
|
}
|
|
|
|
ASSERT(zfs_refcount_is_zero(&db->db_holds));
|
|
|
|
db->db_parent = NULL;
|
|
|
|
ASSERT(db->db_buf == NULL);
|
|
ASSERT(db->db.db_data == NULL);
|
|
ASSERT(db->db_hash_next == NULL);
|
|
ASSERT(db->db_blkptr == NULL);
|
|
ASSERT(db->db_data_pending == NULL);
|
|
ASSERT3U(db->db_caching_status, ==, DB_NO_CACHE);
|
|
ASSERT(!multilist_link_active(&db->db_cache_link));
|
|
|
|
/*
|
|
* If this dbuf is referenced from an indirect dbuf,
|
|
* decrement the ref count on the indirect dbuf.
|
|
*/
|
|
if (parent && parent != dndb) {
|
|
mutex_enter(&parent->db_mtx);
|
|
dbuf_rele_and_unlock(parent, db, B_TRUE);
|
|
}
|
|
|
|
kmem_cache_free(dbuf_kmem_cache, db);
|
|
arc_space_return(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF);
|
|
}
|
|
|
|
/*
|
|
* Note: While bpp will always be updated if the function returns success,
|
|
* parentp will not be updated if the dnode does not have dn_dbuf filled in;
|
|
* this happens when the dnode is the meta-dnode, or {user|group|project}used
|
|
* object.
|
|
*/
|
|
__attribute__((always_inline))
|
|
static inline int
|
|
dbuf_findbp(dnode_t *dn, int level, uint64_t blkid, int fail_sparse,
|
|
dmu_buf_impl_t **parentp, blkptr_t **bpp)
|
|
{
|
|
*parentp = NULL;
|
|
*bpp = NULL;
|
|
|
|
ASSERT(blkid != DMU_BONUS_BLKID);
|
|
|
|
if (blkid == DMU_SPILL_BLKID) {
|
|
mutex_enter(&dn->dn_mtx);
|
|
if (dn->dn_have_spill &&
|
|
(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR))
|
|
*bpp = DN_SPILL_BLKPTR(dn->dn_phys);
|
|
else
|
|
*bpp = NULL;
|
|
dbuf_add_ref(dn->dn_dbuf, NULL);
|
|
*parentp = dn->dn_dbuf;
|
|
mutex_exit(&dn->dn_mtx);
|
|
return (0);
|
|
}
|
|
|
|
int nlevels =
|
|
(dn->dn_phys->dn_nlevels == 0) ? 1 : dn->dn_phys->dn_nlevels;
|
|
int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
|
|
|
|
ASSERT3U(level * epbs, <, 64);
|
|
ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));
|
|
/*
|
|
* This assertion shouldn't trip as long as the max indirect block size
|
|
* is less than 1M. The reason for this is that up to that point,
|
|
* the number of levels required to address an entire object with blocks
|
|
* of size SPA_MINBLOCKSIZE satisfies nlevels * epbs + 1 <= 64. In
|
|
* other words, if N * epbs + 1 > 64, then if (N-1) * epbs + 1 > 55
|
|
* (i.e. we can address the entire object), objects will all use at most
|
|
* N-1 levels and the assertion won't overflow. However, once epbs is
|
|
* 13, 4 * 13 + 1 = 53, but 5 * 13 + 1 = 66. Then, 4 levels will not be
|
|
* enough to address an entire object, so objects will have 5 levels,
|
|
* but then this assertion will overflow.
|
|
*
|
|
* All this is to say that if we ever increase DN_MAX_INDBLKSHIFT, we
|
|
* need to redo this logic to handle overflows.
|
|
*/
|
|
ASSERT(level >= nlevels ||
|
|
((nlevels - level - 1) * epbs) +
|
|
highbit64(dn->dn_phys->dn_nblkptr) <= 64);
|
|
if (level >= nlevels ||
|
|
blkid >= ((uint64_t)dn->dn_phys->dn_nblkptr <<
|
|
((nlevels - level - 1) * epbs)) ||
|
|
(fail_sparse &&
|
|
blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))) {
|
|
/* the buffer has no parent yet */
|
|
return (SET_ERROR(ENOENT));
|
|
} else if (level < nlevels-1) {
|
|
/* this block is referenced from an indirect block */
|
|
int err;
|
|
|
|
err = dbuf_hold_impl(dn, level + 1,
|
|
blkid >> epbs, fail_sparse, FALSE, NULL, parentp);
|
|
|
|
if (err)
|
|
return (err);
|
|
err = dbuf_read(*parentp, NULL,
|
|
(DB_RF_HAVESTRUCT | DB_RF_NOPREFETCH | DB_RF_CANFAIL));
|
|
if (err) {
|
|
dbuf_rele(*parentp, NULL);
|
|
*parentp = NULL;
|
|
return (err);
|
|
}
|
|
rw_enter(&(*parentp)->db_rwlock, RW_READER);
|
|
*bpp = ((blkptr_t *)(*parentp)->db.db_data) +
|
|
(blkid & ((1ULL << epbs) - 1));
|
|
if (blkid > (dn->dn_phys->dn_maxblkid >> (level * epbs)))
|
|
ASSERT(BP_IS_HOLE(*bpp));
|
|
rw_exit(&(*parentp)->db_rwlock);
|
|
return (0);
|
|
} else {
|
|
/* the block is referenced from the dnode */
|
|
ASSERT3U(level, ==, nlevels-1);
|
|
ASSERT(dn->dn_phys->dn_nblkptr == 0 ||
|
|
blkid < dn->dn_phys->dn_nblkptr);
|
|
if (dn->dn_dbuf) {
|
|
dbuf_add_ref(dn->dn_dbuf, NULL);
|
|
*parentp = dn->dn_dbuf;
|
|
}
|
|
*bpp = &dn->dn_phys->dn_blkptr[blkid];
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
static dmu_buf_impl_t *
|
|
dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid,
|
|
dmu_buf_impl_t *parent, blkptr_t *blkptr, uint64_t hash)
|
|
{
|
|
objset_t *os = dn->dn_objset;
|
|
dmu_buf_impl_t *db, *odb;
|
|
|
|
ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));
|
|
ASSERT(dn->dn_type != DMU_OT_NONE);
|
|
|
|
db = kmem_cache_alloc(dbuf_kmem_cache, KM_SLEEP);
|
|
|
|
list_create(&db->db_dirty_records, sizeof (dbuf_dirty_record_t),
|
|
offsetof(dbuf_dirty_record_t, dr_dbuf_node));
|
|
|
|
db->db_objset = os;
|
|
db->db.db_object = dn->dn_object;
|
|
db->db_level = level;
|
|
db->db_blkid = blkid;
|
|
db->db_dirtycnt = 0;
|
|
db->db_dnode_handle = dn->dn_handle;
|
|
db->db_parent = parent;
|
|
db->db_blkptr = blkptr;
|
|
db->db_hash = hash;
|
|
|
|
db->db_user = NULL;
|
|
db->db_user_immediate_evict = FALSE;
|
|
db->db_freed_in_flight = FALSE;
|
|
db->db_pending_evict = FALSE;
|
|
|
|
if (blkid == DMU_BONUS_BLKID) {
|
|
ASSERT3P(parent, ==, dn->dn_dbuf);
|
|
db->db.db_size = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots) -
|
|
(dn->dn_nblkptr-1) * sizeof (blkptr_t);
|
|
ASSERT3U(db->db.db_size, >=, dn->dn_bonuslen);
|
|
db->db.db_offset = DMU_BONUS_BLKID;
|
|
db->db_state = DB_UNCACHED;
|
|
DTRACE_SET_STATE(db, "bonus buffer created");
|
|
db->db_caching_status = DB_NO_CACHE;
|
|
/* the bonus dbuf is not placed in the hash table */
|
|
arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF);
|
|
return (db);
|
|
} else if (blkid == DMU_SPILL_BLKID) {
|
|
db->db.db_size = (blkptr != NULL) ?
|
|
BP_GET_LSIZE(blkptr) : SPA_MINBLOCKSIZE;
|
|
db->db.db_offset = 0;
|
|
} else {
|
|
int blocksize =
|
|
db->db_level ? 1 << dn->dn_indblkshift : dn->dn_datablksz;
|
|
db->db.db_size = blocksize;
|
|
db->db.db_offset = db->db_blkid * blocksize;
|
|
}
|
|
|
|
/*
|
|
* Hold the dn_dbufs_mtx while we get the new dbuf
|
|
* in the hash table *and* added to the dbufs list.
|
|
* This prevents a possible deadlock with someone
|
|
* trying to look up this dbuf before it's added to the
|
|
* dn_dbufs list.
|
|
*/
|
|
mutex_enter(&dn->dn_dbufs_mtx);
|
|
db->db_state = DB_EVICTING; /* not worth logging this state change */
|
|
if ((odb = dbuf_hash_insert(db)) != NULL) {
|
|
/* someone else inserted it first */
|
|
mutex_exit(&dn->dn_dbufs_mtx);
|
|
kmem_cache_free(dbuf_kmem_cache, db);
|
|
DBUF_STAT_BUMP(hash_insert_race);
|
|
return (odb);
|
|
}
|
|
avl_add(&dn->dn_dbufs, db);
|
|
|
|
db->db_state = DB_UNCACHED;
|
|
DTRACE_SET_STATE(db, "regular buffer created");
|
|
db->db_caching_status = DB_NO_CACHE;
|
|
mutex_exit(&dn->dn_dbufs_mtx);
|
|
arc_space_consume(sizeof (dmu_buf_impl_t), ARC_SPACE_DBUF);
|
|
|
|
if (parent && parent != dn->dn_dbuf)
|
|
dbuf_add_ref(parent, db);
|
|
|
|
ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT ||
|
|
zfs_refcount_count(&dn->dn_holds) > 0);
|
|
(void) zfs_refcount_add(&dn->dn_holds, db);
|
|
|
|
dprintf_dbuf(db, "db=%p\n", db);
|
|
|
|
return (db);
|
|
}
|
|
|
|
/*
|
|
* This function returns a block pointer and information about the object,
|
|
* given a dnode and a block. This is a publicly accessible version of
|
|
* dbuf_findbp that only returns some information, rather than the
|
|
* dbuf. Note that the dnode passed in must be held, and the dn_struct_rwlock
|
|
* should be locked as (at least) a reader.
|
|
*/
|
|
int
|
|
dbuf_dnode_findbp(dnode_t *dn, uint64_t level, uint64_t blkid,
|
|
blkptr_t *bp, uint16_t *datablkszsec, uint8_t *indblkshift)
|
|
{
|
|
dmu_buf_impl_t *dbp = NULL;
|
|
blkptr_t *bp2;
|
|
int err = 0;
|
|
ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));
|
|
|
|
err = dbuf_findbp(dn, level, blkid, B_FALSE, &dbp, &bp2);
|
|
if (err == 0) {
|
|
ASSERT3P(bp2, !=, NULL);
|
|
*bp = *bp2;
|
|
if (dbp != NULL)
|
|
dbuf_rele(dbp, NULL);
|
|
if (datablkszsec != NULL)
|
|
*datablkszsec = dn->dn_phys->dn_datablkszsec;
|
|
if (indblkshift != NULL)
|
|
*indblkshift = dn->dn_phys->dn_indblkshift;
|
|
}
|
|
|
|
return (err);
|
|
}
|
|
|
|
typedef struct dbuf_prefetch_arg {
|
|
spa_t *dpa_spa; /* The spa to issue the prefetch in. */
|
|
zbookmark_phys_t dpa_zb; /* The target block to prefetch. */
|
|
int dpa_epbs; /* Entries (blkptr_t's) Per Block Shift. */
|
|
int dpa_curlevel; /* The current level that we're reading */
|
|
dnode_t *dpa_dnode; /* The dnode associated with the prefetch */
|
|
zio_priority_t dpa_prio; /* The priority I/Os should be issued at. */
|
|
zio_t *dpa_zio; /* The parent zio_t for all prefetches. */
|
|
arc_flags_t dpa_aflags; /* Flags to pass to the final prefetch. */
|
|
dbuf_prefetch_fn dpa_cb; /* prefetch completion callback */
|
|
void *dpa_arg; /* prefetch completion arg */
|
|
} dbuf_prefetch_arg_t;
|
|
|
|
static void
|
|
dbuf_prefetch_fini(dbuf_prefetch_arg_t *dpa, boolean_t io_done)
|
|
{
|
|
if (dpa->dpa_cb != NULL) {
|
|
dpa->dpa_cb(dpa->dpa_arg, dpa->dpa_zb.zb_level,
|
|
dpa->dpa_zb.zb_blkid, io_done);
|
|
}
|
|
kmem_free(dpa, sizeof (*dpa));
|
|
}
|
|
|
|
static void
|
|
dbuf_issue_final_prefetch_done(zio_t *zio, const zbookmark_phys_t *zb,
|
|
const blkptr_t *iobp, arc_buf_t *abuf, void *private)
|
|
{
|
|
(void) zio, (void) zb, (void) iobp;
|
|
dbuf_prefetch_arg_t *dpa = private;
|
|
|
|
if (abuf != NULL)
|
|
arc_buf_destroy(abuf, private);
|
|
|
|
dbuf_prefetch_fini(dpa, B_TRUE);
|
|
}
|
|
|
|
/*
|
|
* Actually issue the prefetch read for the block given.
|
|
*/
|
|
static void
|
|
dbuf_issue_final_prefetch(dbuf_prefetch_arg_t *dpa, blkptr_t *bp)
|
|
{
|
|
ASSERT(!BP_IS_REDACTED(bp) ||
|
|
dsl_dataset_feature_is_active(
|
|
dpa->dpa_dnode->dn_objset->os_dsl_dataset,
|
|
SPA_FEATURE_REDACTED_DATASETS));
|
|
|
|
if (BP_IS_HOLE(bp) || BP_IS_EMBEDDED(bp) || BP_IS_REDACTED(bp))
|
|
return (dbuf_prefetch_fini(dpa, B_FALSE));
|
|
|
|
int zio_flags = ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE;
|
|
arc_flags_t aflags =
|
|
dpa->dpa_aflags | ARC_FLAG_NOWAIT | ARC_FLAG_PREFETCH |
|
|
ARC_FLAG_NO_BUF;
|
|
|
|
/* dnodes are always read as raw and then converted later */
|
|
if (BP_GET_TYPE(bp) == DMU_OT_DNODE && BP_IS_PROTECTED(bp) &&
|
|
dpa->dpa_curlevel == 0)
|
|
zio_flags |= ZIO_FLAG_RAW;
|
|
|
|
ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp));
|
|
ASSERT3U(dpa->dpa_curlevel, ==, dpa->dpa_zb.zb_level);
|
|
ASSERT(dpa->dpa_zio != NULL);
|
|
(void) arc_read(dpa->dpa_zio, dpa->dpa_spa, bp,
|
|
dbuf_issue_final_prefetch_done, dpa,
|
|
dpa->dpa_prio, zio_flags, &aflags, &dpa->dpa_zb);
|
|
}
|
|
|
|
/*
|
|
* Called when an indirect block above our prefetch target is read in. This
|
|
* will either read in the next indirect block down the tree or issue the actual
|
|
* prefetch if the next block down is our target.
|
|
*/
|
|
static void
|
|
dbuf_prefetch_indirect_done(zio_t *zio, const zbookmark_phys_t *zb,
|
|
const blkptr_t *iobp, arc_buf_t *abuf, void *private)
|
|
{
|
|
(void) zb, (void) iobp;
|
|
dbuf_prefetch_arg_t *dpa = private;
|
|
|
|
ASSERT3S(dpa->dpa_zb.zb_level, <, dpa->dpa_curlevel);
|
|
ASSERT3S(dpa->dpa_curlevel, >, 0);
|
|
|
|
if (abuf == NULL) {
|
|
ASSERT(zio == NULL || zio->io_error != 0);
|
|
dbuf_prefetch_fini(dpa, B_TRUE);
|
|
return;
|
|
}
|
|
ASSERT(zio == NULL || zio->io_error == 0);
|
|
|
|
/*
|
|
* The dpa_dnode is only valid if we are called with a NULL
|
|
* zio. This indicates that the arc_read() returned without
|
|
* first calling zio_read() to issue a physical read. Once
|
|
* a physical read is made the dpa_dnode must be invalidated
|
|
* as the locks guarding it may have been dropped. If the
|
|
* dpa_dnode is still valid, then we want to add it to the dbuf
|
|
* cache. To do so, we must hold the dbuf associated with the block
|
|
* we just prefetched, read its contents so that we associate it
|
|
* with an arc_buf_t, and then release it.
|
|
*/
|
|
if (zio != NULL) {
|
|
ASSERT3S(BP_GET_LEVEL(zio->io_bp), ==, dpa->dpa_curlevel);
|
|
if (zio->io_flags & ZIO_FLAG_RAW_COMPRESS) {
|
|
ASSERT3U(BP_GET_PSIZE(zio->io_bp), ==, zio->io_size);
|
|
} else {
|
|
ASSERT3U(BP_GET_LSIZE(zio->io_bp), ==, zio->io_size);
|
|
}
|
|
ASSERT3P(zio->io_spa, ==, dpa->dpa_spa);
|
|
|
|
dpa->dpa_dnode = NULL;
|
|
} else if (dpa->dpa_dnode != NULL) {
|
|
uint64_t curblkid = dpa->dpa_zb.zb_blkid >>
|
|
(dpa->dpa_epbs * (dpa->dpa_curlevel -
|
|
dpa->dpa_zb.zb_level));
|
|
dmu_buf_impl_t *db = dbuf_hold_level(dpa->dpa_dnode,
|
|
dpa->dpa_curlevel, curblkid, FTAG);
|
|
if (db == NULL) {
|
|
arc_buf_destroy(abuf, private);
|
|
dbuf_prefetch_fini(dpa, B_TRUE);
|
|
return;
|
|
}
|
|
(void) dbuf_read(db, NULL,
|
|
DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH | DB_RF_HAVESTRUCT);
|
|
dbuf_rele(db, FTAG);
|
|
}
|
|
|
|
dpa->dpa_curlevel--;
|
|
uint64_t nextblkid = dpa->dpa_zb.zb_blkid >>
|
|
(dpa->dpa_epbs * (dpa->dpa_curlevel - dpa->dpa_zb.zb_level));
|
|
blkptr_t *bp = ((blkptr_t *)abuf->b_data) +
|
|
P2PHASE(nextblkid, 1ULL << dpa->dpa_epbs);
|
|
|
|
ASSERT(!BP_IS_REDACTED(bp) || (dpa->dpa_dnode &&
|
|
dsl_dataset_feature_is_active(
|
|
dpa->dpa_dnode->dn_objset->os_dsl_dataset,
|
|
SPA_FEATURE_REDACTED_DATASETS)));
|
|
if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) {
|
|
arc_buf_destroy(abuf, private);
|
|
dbuf_prefetch_fini(dpa, B_TRUE);
|
|
return;
|
|
} else if (dpa->dpa_curlevel == dpa->dpa_zb.zb_level) {
|
|
ASSERT3U(nextblkid, ==, dpa->dpa_zb.zb_blkid);
|
|
dbuf_issue_final_prefetch(dpa, bp);
|
|
} else {
|
|
arc_flags_t iter_aflags = ARC_FLAG_NOWAIT;
|
|
zbookmark_phys_t zb;
|
|
|
|
/* flag if L2ARC eligible, l2arc_noprefetch then decides */
|
|
if (dpa->dpa_aflags & ARC_FLAG_L2CACHE)
|
|
iter_aflags |= ARC_FLAG_L2CACHE;
|
|
|
|
ASSERT3U(dpa->dpa_curlevel, ==, BP_GET_LEVEL(bp));
|
|
|
|
SET_BOOKMARK(&zb, dpa->dpa_zb.zb_objset,
|
|
dpa->dpa_zb.zb_object, dpa->dpa_curlevel, nextblkid);
|
|
|
|
(void) arc_read(dpa->dpa_zio, dpa->dpa_spa,
|
|
bp, dbuf_prefetch_indirect_done, dpa,
|
|
ZIO_PRIORITY_SYNC_READ,
|
|
ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE,
|
|
&iter_aflags, &zb);
|
|
}
|
|
|
|
arc_buf_destroy(abuf, private);
|
|
}
|
|
|
|
/*
|
|
* Issue prefetch reads for the given block on the given level. If the indirect
|
|
* blocks above that block are not in memory, we will read them in
|
|
* asynchronously. As a result, this call never blocks waiting for a read to
|
|
* complete. Note that the prefetch might fail if the dataset is encrypted and
|
|
* the encryption key is unmapped before the IO completes.
|
|
*/
|
|
int
|
|
dbuf_prefetch_impl(dnode_t *dn, int64_t level, uint64_t blkid,
|
|
zio_priority_t prio, arc_flags_t aflags, dbuf_prefetch_fn cb,
|
|
void *arg)
|
|
{
|
|
blkptr_t bp;
|
|
int epbs, nlevels, curlevel;
|
|
uint64_t curblkid;
|
|
|
|
ASSERT(blkid != DMU_BONUS_BLKID);
|
|
ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));
|
|
|
|
if (blkid > dn->dn_maxblkid)
|
|
goto no_issue;
|
|
|
|
if (level == 0 && dnode_block_freed(dn, blkid))
|
|
goto no_issue;
|
|
|
|
/*
|
|
* This dnode hasn't been written to disk yet, so there's nothing to
|
|
* prefetch.
|
|
*/
|
|
nlevels = dn->dn_phys->dn_nlevels;
|
|
if (level >= nlevels || dn->dn_phys->dn_nblkptr == 0)
|
|
goto no_issue;
|
|
|
|
epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
|
|
if (dn->dn_phys->dn_maxblkid < blkid << (epbs * level))
|
|
goto no_issue;
|
|
|
|
dmu_buf_impl_t *db = dbuf_find(dn->dn_objset, dn->dn_object,
|
|
level, blkid, NULL);
|
|
if (db != NULL) {
|
|
mutex_exit(&db->db_mtx);
|
|
/*
|
|
* This dbuf already exists. It is either CACHED, or
|
|
* (we assume) about to be read or filled.
|
|
*/
|
|
goto no_issue;
|
|
}
|
|
|
|
/*
|
|
* Find the closest ancestor (indirect block) of the target block
|
|
* that is present in the cache. In this indirect block, we will
|
|
* find the bp that is at curlevel, curblkid.
|
|
*/
|
|
curlevel = level;
|
|
curblkid = blkid;
|
|
while (curlevel < nlevels - 1) {
|
|
int parent_level = curlevel + 1;
|
|
uint64_t parent_blkid = curblkid >> epbs;
|
|
dmu_buf_impl_t *db;
|
|
|
|
if (dbuf_hold_impl(dn, parent_level, parent_blkid,
|
|
FALSE, TRUE, FTAG, &db) == 0) {
|
|
blkptr_t *bpp = db->db_buf->b_data;
|
|
bp = bpp[P2PHASE(curblkid, 1 << epbs)];
|
|
dbuf_rele(db, FTAG);
|
|
break;
|
|
}
|
|
|
|
curlevel = parent_level;
|
|
curblkid = parent_blkid;
|
|
}
|
|
|
|
if (curlevel == nlevels - 1) {
|
|
/* No cached indirect blocks found. */
|
|
ASSERT3U(curblkid, <, dn->dn_phys->dn_nblkptr);
|
|
bp = dn->dn_phys->dn_blkptr[curblkid];
|
|
}
|
|
ASSERT(!BP_IS_REDACTED(&bp) ||
|
|
dsl_dataset_feature_is_active(dn->dn_objset->os_dsl_dataset,
|
|
SPA_FEATURE_REDACTED_DATASETS));
|
|
if (BP_IS_HOLE(&bp) || BP_IS_REDACTED(&bp))
|
|
goto no_issue;
|
|
|
|
ASSERT3U(curlevel, ==, BP_GET_LEVEL(&bp));
|
|
|
|
zio_t *pio = zio_root(dmu_objset_spa(dn->dn_objset), NULL, NULL,
|
|
ZIO_FLAG_CANFAIL);
|
|
|
|
dbuf_prefetch_arg_t *dpa = kmem_zalloc(sizeof (*dpa), KM_SLEEP);
|
|
dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset;
|
|
SET_BOOKMARK(&dpa->dpa_zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET,
|
|
dn->dn_object, level, blkid);
|
|
dpa->dpa_curlevel = curlevel;
|
|
dpa->dpa_prio = prio;
|
|
dpa->dpa_aflags = aflags;
|
|
dpa->dpa_spa = dn->dn_objset->os_spa;
|
|
dpa->dpa_dnode = dn;
|
|
dpa->dpa_epbs = epbs;
|
|
dpa->dpa_zio = pio;
|
|
dpa->dpa_cb = cb;
|
|
dpa->dpa_arg = arg;
|
|
|
|
if (!DNODE_LEVEL_IS_CACHEABLE(dn, level))
|
|
dpa->dpa_aflags |= ARC_FLAG_UNCACHED;
|
|
else if (dnode_level_is_l2cacheable(&bp, dn, level))
|
|
dpa->dpa_aflags |= ARC_FLAG_L2CACHE;
|
|
|
|
/*
|
|
* If we have the indirect just above us, no need to do the asynchronous
|
|
* prefetch chain; we'll just run the last step ourselves. If we're at
|
|
* a higher level, though, we want to issue the prefetches for all the
|
|
* indirect blocks asynchronously, so we can go on with whatever we were
|
|
* doing.
|
|
*/
|
|
if (curlevel == level) {
|
|
ASSERT3U(curblkid, ==, blkid);
|
|
dbuf_issue_final_prefetch(dpa, &bp);
|
|
} else {
|
|
arc_flags_t iter_aflags = ARC_FLAG_NOWAIT;
|
|
zbookmark_phys_t zb;
|
|
|
|
/* flag if L2ARC eligible, l2arc_noprefetch then decides */
|
|
if (dnode_level_is_l2cacheable(&bp, dn, level))
|
|
iter_aflags |= ARC_FLAG_L2CACHE;
|
|
|
|
SET_BOOKMARK(&zb, ds != NULL ? ds->ds_object : DMU_META_OBJSET,
|
|
dn->dn_object, curlevel, curblkid);
|
|
(void) arc_read(dpa->dpa_zio, dpa->dpa_spa,
|
|
&bp, dbuf_prefetch_indirect_done, dpa,
|
|
ZIO_PRIORITY_SYNC_READ,
|
|
ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE,
|
|
&iter_aflags, &zb);
|
|
}
|
|
/*
|
|
* We use pio here instead of dpa_zio since it's possible that
|
|
* dpa may have already been freed.
|
|
*/
|
|
zio_nowait(pio);
|
|
return (1);
|
|
no_issue:
|
|
if (cb != NULL)
|
|
cb(arg, level, blkid, B_FALSE);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
dbuf_prefetch(dnode_t *dn, int64_t level, uint64_t blkid, zio_priority_t prio,
|
|
arc_flags_t aflags)
|
|
{
|
|
|
|
return (dbuf_prefetch_impl(dn, level, blkid, prio, aflags, NULL, NULL));
|
|
}
|
|
|
|
/*
|
|
* Helper function for dbuf_hold_impl() to copy a buffer. Handles
|
|
* the case of encrypted, compressed and uncompressed buffers by
|
|
* allocating the new buffer, respectively, with arc_alloc_raw_buf(),
|
|
* arc_alloc_compressed_buf() or arc_alloc_buf().*
|
|
*
|
|
* NOTE: Declared noinline to avoid stack bloat in dbuf_hold_impl().
|
|
*/
|
|
noinline static void
|
|
dbuf_hold_copy(dnode_t *dn, dmu_buf_impl_t *db)
|
|
{
|
|
dbuf_dirty_record_t *dr = db->db_data_pending;
|
|
arc_buf_t *data = dr->dt.dl.dr_data;
|
|
enum zio_compress compress_type = arc_get_compression(data);
|
|
uint8_t complevel = arc_get_complevel(data);
|
|
|
|
if (arc_is_encrypted(data)) {
|
|
boolean_t byteorder;
|
|
uint8_t salt[ZIO_DATA_SALT_LEN];
|
|
uint8_t iv[ZIO_DATA_IV_LEN];
|
|
uint8_t mac[ZIO_DATA_MAC_LEN];
|
|
|
|
arc_get_raw_params(data, &byteorder, salt, iv, mac);
|
|
dbuf_set_data(db, arc_alloc_raw_buf(dn->dn_objset->os_spa, db,
|
|
dmu_objset_id(dn->dn_objset), byteorder, salt, iv, mac,
|
|
dn->dn_type, arc_buf_size(data), arc_buf_lsize(data),
|
|
compress_type, complevel));
|
|
} else if (compress_type != ZIO_COMPRESS_OFF) {
|
|
dbuf_set_data(db, arc_alloc_compressed_buf(
|
|
dn->dn_objset->os_spa, db, arc_buf_size(data),
|
|
arc_buf_lsize(data), compress_type, complevel));
|
|
} else {
|
|
dbuf_set_data(db, arc_alloc_buf(dn->dn_objset->os_spa, db,
|
|
DBUF_GET_BUFC_TYPE(db), db->db.db_size));
|
|
}
|
|
|
|
rw_enter(&db->db_rwlock, RW_WRITER);
|
|
memcpy(db->db.db_data, data->b_data, arc_buf_size(data));
|
|
rw_exit(&db->db_rwlock);
|
|
}
|
|
|
|
/*
|
|
* Returns with db_holds incremented, and db_mtx not held.
|
|
* Note: dn_struct_rwlock must be held.
|
|
*/
|
|
int
|
|
dbuf_hold_impl(dnode_t *dn, uint8_t level, uint64_t blkid,
|
|
boolean_t fail_sparse, boolean_t fail_uncached,
|
|
const void *tag, dmu_buf_impl_t **dbp)
|
|
{
|
|
dmu_buf_impl_t *db, *parent = NULL;
|
|
uint64_t hv;
|
|
|
|
/* If the pool has been created, verify the tx_sync_lock is not held */
|
|
spa_t *spa = dn->dn_objset->os_spa;
|
|
dsl_pool_t *dp = spa->spa_dsl_pool;
|
|
if (dp != NULL) {
|
|
ASSERT(!MUTEX_HELD(&dp->dp_tx.tx_sync_lock));
|
|
}
|
|
|
|
ASSERT(blkid != DMU_BONUS_BLKID);
|
|
ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));
|
|
ASSERT3U(dn->dn_nlevels, >, level);
|
|
|
|
*dbp = NULL;
|
|
|
|
/* dbuf_find() returns with db_mtx held */
|
|
db = dbuf_find(dn->dn_objset, dn->dn_object, level, blkid, &hv);
|
|
|
|
if (db == NULL) {
|
|
blkptr_t *bp = NULL;
|
|
int err;
|
|
|
|
if (fail_uncached)
|
|
return (SET_ERROR(ENOENT));
|
|
|
|
ASSERT3P(parent, ==, NULL);
|
|
err = dbuf_findbp(dn, level, blkid, fail_sparse, &parent, &bp);
|
|
if (fail_sparse) {
|
|
if (err == 0 && bp && BP_IS_HOLE(bp))
|
|
err = SET_ERROR(ENOENT);
|
|
if (err) {
|
|
if (parent)
|
|
dbuf_rele(parent, NULL);
|
|
return (err);
|
|
}
|
|
}
|
|
if (err && err != ENOENT)
|
|
return (err);
|
|
db = dbuf_create(dn, level, blkid, parent, bp, hv);
|
|
}
|
|
|
|
if (fail_uncached && db->db_state != DB_CACHED) {
|
|
mutex_exit(&db->db_mtx);
|
|
return (SET_ERROR(ENOENT));
|
|
}
|
|
|
|
if (db->db_buf != NULL) {
|
|
arc_buf_access(db->db_buf);
|
|
ASSERT3P(db->db.db_data, ==, db->db_buf->b_data);
|
|
}
|
|
|
|
ASSERT(db->db_buf == NULL || arc_referenced(db->db_buf));
|
|
|
|
/*
|
|
* If this buffer is currently syncing out, and we are
|
|
* still referencing it from db_data, we need to make a copy
|
|
* of it in case we decide we want to dirty it again in this txg.
|
|
*/
|
|
if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID &&
|
|
dn->dn_object != DMU_META_DNODE_OBJECT &&
|
|
db->db_state == DB_CACHED && db->db_data_pending) {
|
|
dbuf_dirty_record_t *dr = db->db_data_pending;
|
|
if (dr->dt.dl.dr_data == db->db_buf) {
|
|
ASSERT3P(db->db_buf, !=, NULL);
|
|
dbuf_hold_copy(dn, db);
|
|
}
|
|
}
|
|
|
|
if (multilist_link_active(&db->db_cache_link)) {
|
|
ASSERT(zfs_refcount_is_zero(&db->db_holds));
|
|
ASSERT(db->db_caching_status == DB_DBUF_CACHE ||
|
|
db->db_caching_status == DB_DBUF_METADATA_CACHE);
|
|
|
|
multilist_remove(&dbuf_caches[db->db_caching_status].cache, db);
|
|
(void) zfs_refcount_remove_many(
|
|
&dbuf_caches[db->db_caching_status].size,
|
|
db->db.db_size, db);
|
|
|
|
if (db->db_caching_status == DB_DBUF_METADATA_CACHE) {
|
|
DBUF_STAT_BUMPDOWN(metadata_cache_count);
|
|
} else {
|
|
DBUF_STAT_BUMPDOWN(cache_levels[db->db_level]);
|
|
DBUF_STAT_BUMPDOWN(cache_count);
|
|
DBUF_STAT_DECR(cache_levels_bytes[db->db_level],
|
|
db->db.db_size);
|
|
}
|
|
db->db_caching_status = DB_NO_CACHE;
|
|
}
|
|
(void) zfs_refcount_add(&db->db_holds, tag);
|
|
DBUF_VERIFY(db);
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
/* NOTE: we can't rele the parent until after we drop the db_mtx */
|
|
if (parent)
|
|
dbuf_rele(parent, NULL);
|
|
|
|
ASSERT3P(DB_DNODE(db), ==, dn);
|
|
ASSERT3U(db->db_blkid, ==, blkid);
|
|
ASSERT3U(db->db_level, ==, level);
|
|
*dbp = db;
|
|
|
|
return (0);
|
|
}
|
|
|
|
dmu_buf_impl_t *
|
|
dbuf_hold(dnode_t *dn, uint64_t blkid, const void *tag)
|
|
{
|
|
return (dbuf_hold_level(dn, 0, blkid, tag));
|
|
}
|
|
|
|
dmu_buf_impl_t *
|
|
dbuf_hold_level(dnode_t *dn, int level, uint64_t blkid, const void *tag)
|
|
{
|
|
dmu_buf_impl_t *db;
|
|
int err = dbuf_hold_impl(dn, level, blkid, FALSE, FALSE, tag, &db);
|
|
return (err ? NULL : db);
|
|
}
|
|
|
|
void
|
|
dbuf_create_bonus(dnode_t *dn)
|
|
{
|
|
ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock));
|
|
|
|
ASSERT(dn->dn_bonus == NULL);
|
|
dn->dn_bonus = dbuf_create(dn, 0, DMU_BONUS_BLKID, dn->dn_dbuf, NULL,
|
|
dbuf_hash(dn->dn_objset, dn->dn_object, 0, DMU_BONUS_BLKID));
|
|
}
|
|
|
|
int
|
|
dbuf_spill_set_blksz(dmu_buf_t *db_fake, uint64_t blksz, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
|
|
if (db->db_blkid != DMU_SPILL_BLKID)
|
|
return (SET_ERROR(ENOTSUP));
|
|
if (blksz == 0)
|
|
blksz = SPA_MINBLOCKSIZE;
|
|
ASSERT3U(blksz, <=, spa_maxblocksize(dmu_objset_spa(db->db_objset)));
|
|
blksz = P2ROUNDUP(blksz, SPA_MINBLOCKSIZE);
|
|
|
|
dbuf_new_size(db, blksz, tx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx)
|
|
{
|
|
dbuf_free_range(dn, DMU_SPILL_BLKID, DMU_SPILL_BLKID, tx);
|
|
}
|
|
|
|
#pragma weak dmu_buf_add_ref = dbuf_add_ref
|
|
void
|
|
dbuf_add_ref(dmu_buf_impl_t *db, const void *tag)
|
|
{
|
|
int64_t holds = zfs_refcount_add(&db->db_holds, tag);
|
|
VERIFY3S(holds, >, 1);
|
|
}
|
|
|
|
#pragma weak dmu_buf_try_add_ref = dbuf_try_add_ref
|
|
boolean_t
|
|
dbuf_try_add_ref(dmu_buf_t *db_fake, objset_t *os, uint64_t obj, uint64_t blkid,
|
|
const void *tag)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
dmu_buf_impl_t *found_db;
|
|
boolean_t result = B_FALSE;
|
|
|
|
if (blkid == DMU_BONUS_BLKID)
|
|
found_db = dbuf_find_bonus(os, obj);
|
|
else
|
|
found_db = dbuf_find(os, obj, 0, blkid, NULL);
|
|
|
|
if (found_db != NULL) {
|
|
if (db == found_db && dbuf_refcount(db) > db->db_dirtycnt) {
|
|
(void) zfs_refcount_add(&db->db_holds, tag);
|
|
result = B_TRUE;
|
|
}
|
|
mutex_exit(&found_db->db_mtx);
|
|
}
|
|
return (result);
|
|
}
|
|
|
|
/*
|
|
* If you call dbuf_rele() you had better not be referencing the dnode handle
|
|
* unless you have some other direct or indirect hold on the dnode. (An indirect
|
|
* hold is a hold on one of the dnode's dbufs, including the bonus buffer.)
|
|
* Without that, the dbuf_rele() could lead to a dnode_rele() followed by the
|
|
* dnode's parent dbuf evicting its dnode handles.
|
|
*/
|
|
void
|
|
dbuf_rele(dmu_buf_impl_t *db, const void *tag)
|
|
{
|
|
mutex_enter(&db->db_mtx);
|
|
dbuf_rele_and_unlock(db, tag, B_FALSE);
|
|
}
|
|
|
|
void
|
|
dmu_buf_rele(dmu_buf_t *db, const void *tag)
|
|
{
|
|
dbuf_rele((dmu_buf_impl_t *)db, tag);
|
|
}
|
|
|
|
/*
|
|
* dbuf_rele() for an already-locked dbuf. This is necessary to allow
|
|
* db_dirtycnt and db_holds to be updated atomically. The 'evicting'
|
|
* argument should be set if we are already in the dbuf-evicting code
|
|
* path, in which case we don't want to recursively evict. This allows us to
|
|
* avoid deeply nested stacks that would have a call flow similar to this:
|
|
*
|
|
* dbuf_rele()-->dbuf_rele_and_unlock()-->dbuf_evict_notify()
|
|
* ^ |
|
|
* | |
|
|
* +-----dbuf_destroy()<--dbuf_evict_one()<--------+
|
|
*
|
|
*/
|
|
void
|
|
dbuf_rele_and_unlock(dmu_buf_impl_t *db, const void *tag, boolean_t evicting)
|
|
{
|
|
int64_t holds;
|
|
uint64_t size;
|
|
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
DBUF_VERIFY(db);
|
|
|
|
/*
|
|
* Remove the reference to the dbuf before removing its hold on the
|
|
* dnode so we can guarantee in dnode_move() that a referenced bonus
|
|
* buffer has a corresponding dnode hold.
|
|
*/
|
|
holds = zfs_refcount_remove(&db->db_holds, tag);
|
|
ASSERT(holds >= 0);
|
|
|
|
/*
|
|
* We can't freeze indirects if there is a possibility that they
|
|
* may be modified in the current syncing context.
|
|
*/
|
|
if (db->db_buf != NULL &&
|
|
holds == (db->db_level == 0 ? db->db_dirtycnt : 0)) {
|
|
arc_buf_freeze(db->db_buf);
|
|
}
|
|
|
|
if (holds == db->db_dirtycnt &&
|
|
db->db_level == 0 && db->db_user_immediate_evict)
|
|
dbuf_evict_user(db);
|
|
|
|
if (holds == 0) {
|
|
if (db->db_blkid == DMU_BONUS_BLKID) {
|
|
dnode_t *dn;
|
|
boolean_t evict_dbuf = db->db_pending_evict;
|
|
|
|
/*
|
|
* If the dnode moves here, we cannot cross this
|
|
* barrier until the move completes.
|
|
*/
|
|
DB_DNODE_ENTER(db);
|
|
|
|
dn = DB_DNODE(db);
|
|
atomic_dec_32(&dn->dn_dbufs_count);
|
|
|
|
/*
|
|
* Decrementing the dbuf count means that the bonus
|
|
* buffer's dnode hold is no longer discounted in
|
|
* dnode_move(). The dnode cannot move until after
|
|
* the dnode_rele() below.
|
|
*/
|
|
DB_DNODE_EXIT(db);
|
|
|
|
/*
|
|
* Do not reference db after its lock is dropped.
|
|
* Another thread may evict it.
|
|
*/
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
if (evict_dbuf)
|
|
dnode_evict_bonus(dn);
|
|
|
|
dnode_rele(dn, db);
|
|
} else if (db->db_buf == NULL) {
|
|
/*
|
|
* This is a special case: we never associated this
|
|
* dbuf with any data allocated from the ARC.
|
|
*/
|
|
ASSERT(db->db_state == DB_UNCACHED ||
|
|
db->db_state == DB_NOFILL);
|
|
dbuf_destroy(db);
|
|
} else if (arc_released(db->db_buf)) {
|
|
/*
|
|
* This dbuf has anonymous data associated with it.
|
|
*/
|
|
dbuf_destroy(db);
|
|
} else if (!(DBUF_IS_CACHEABLE(db) || db->db_partial_read) ||
|
|
db->db_pending_evict) {
|
|
dbuf_destroy(db);
|
|
} else if (!multilist_link_active(&db->db_cache_link)) {
|
|
ASSERT3U(db->db_caching_status, ==, DB_NO_CACHE);
|
|
|
|
dbuf_cached_state_t dcs =
|
|
dbuf_include_in_metadata_cache(db) ?
|
|
DB_DBUF_METADATA_CACHE : DB_DBUF_CACHE;
|
|
db->db_caching_status = dcs;
|
|
|
|
multilist_insert(&dbuf_caches[dcs].cache, db);
|
|
uint64_t db_size = db->db.db_size;
|
|
size = zfs_refcount_add_many(
|
|
&dbuf_caches[dcs].size, db_size, db);
|
|
uint8_t db_level = db->db_level;
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
if (dcs == DB_DBUF_METADATA_CACHE) {
|
|
DBUF_STAT_BUMP(metadata_cache_count);
|
|
DBUF_STAT_MAX(metadata_cache_size_bytes_max,
|
|
size);
|
|
} else {
|
|
DBUF_STAT_BUMP(cache_count);
|
|
DBUF_STAT_MAX(cache_size_bytes_max, size);
|
|
DBUF_STAT_BUMP(cache_levels[db_level]);
|
|
DBUF_STAT_INCR(cache_levels_bytes[db_level],
|
|
db_size);
|
|
}
|
|
|
|
if (dcs == DB_DBUF_CACHE && !evicting)
|
|
dbuf_evict_notify(size);
|
|
}
|
|
} else {
|
|
mutex_exit(&db->db_mtx);
|
|
}
|
|
|
|
}
|
|
|
|
#pragma weak dmu_buf_refcount = dbuf_refcount
|
|
uint64_t
|
|
dbuf_refcount(dmu_buf_impl_t *db)
|
|
{
|
|
return (zfs_refcount_count(&db->db_holds));
|
|
}
|
|
|
|
uint64_t
|
|
dmu_buf_user_refcount(dmu_buf_t *db_fake)
|
|
{
|
|
uint64_t holds;
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
ASSERT3U(zfs_refcount_count(&db->db_holds), >=, db->db_dirtycnt);
|
|
holds = zfs_refcount_count(&db->db_holds) - db->db_dirtycnt;
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
return (holds);
|
|
}
|
|
|
|
void *
|
|
dmu_buf_replace_user(dmu_buf_t *db_fake, dmu_buf_user_t *old_user,
|
|
dmu_buf_user_t *new_user)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
dbuf_verify_user(db, DBVU_NOT_EVICTING);
|
|
if (db->db_user == old_user)
|
|
db->db_user = new_user;
|
|
else
|
|
old_user = db->db_user;
|
|
dbuf_verify_user(db, DBVU_NOT_EVICTING);
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
return (old_user);
|
|
}
|
|
|
|
void *
|
|
dmu_buf_set_user(dmu_buf_t *db_fake, dmu_buf_user_t *user)
|
|
{
|
|
return (dmu_buf_replace_user(db_fake, NULL, user));
|
|
}
|
|
|
|
void *
|
|
dmu_buf_set_user_ie(dmu_buf_t *db_fake, dmu_buf_user_t *user)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
|
|
db->db_user_immediate_evict = TRUE;
|
|
return (dmu_buf_set_user(db_fake, user));
|
|
}
|
|
|
|
void *
|
|
dmu_buf_remove_user(dmu_buf_t *db_fake, dmu_buf_user_t *user)
|
|
{
|
|
return (dmu_buf_replace_user(db_fake, user, NULL));
|
|
}
|
|
|
|
void *
|
|
dmu_buf_get_user(dmu_buf_t *db_fake)
|
|
{
|
|
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
|
|
|
|
dbuf_verify_user(db, DBVU_NOT_EVICTING);
|
|
return (db->db_user);
|
|
}
|
|
|
|
void
|
|
dmu_buf_user_evict_wait(void)
|
|
{
|
|
taskq_wait(dbu_evict_taskq);
|
|
}
|
|
|
|
blkptr_t *
|
|
dmu_buf_get_blkptr(dmu_buf_t *db)
|
|
{
|
|
dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db;
|
|
return (dbi->db_blkptr);
|
|
}
|
|
|
|
objset_t *
|
|
dmu_buf_get_objset(dmu_buf_t *db)
|
|
{
|
|
dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db;
|
|
return (dbi->db_objset);
|
|
}
|
|
|
|
dnode_t *
|
|
dmu_buf_dnode_enter(dmu_buf_t *db)
|
|
{
|
|
dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db;
|
|
DB_DNODE_ENTER(dbi);
|
|
return (DB_DNODE(dbi));
|
|
}
|
|
|
|
void
|
|
dmu_buf_dnode_exit(dmu_buf_t *db)
|
|
{
|
|
dmu_buf_impl_t *dbi = (dmu_buf_impl_t *)db;
|
|
DB_DNODE_EXIT(dbi);
|
|
}
|
|
|
|
static void
|
|
dbuf_check_blkptr(dnode_t *dn, dmu_buf_impl_t *db)
|
|
{
|
|
/* ASSERT(dmu_tx_is_syncing(tx) */
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
|
|
if (db->db_blkptr != NULL)
|
|
return;
|
|
|
|
if (db->db_blkid == DMU_SPILL_BLKID) {
|
|
db->db_blkptr = DN_SPILL_BLKPTR(dn->dn_phys);
|
|
BP_ZERO(db->db_blkptr);
|
|
return;
|
|
}
|
|
if (db->db_level == dn->dn_phys->dn_nlevels-1) {
|
|
/*
|
|
* This buffer was allocated at a time when there was
|
|
* no available blkptrs from the dnode, or it was
|
|
* inappropriate to hook it in (i.e., nlevels mismatch).
|
|
*/
|
|
ASSERT(db->db_blkid < dn->dn_phys->dn_nblkptr);
|
|
ASSERT(db->db_parent == NULL);
|
|
db->db_parent = dn->dn_dbuf;
|
|
db->db_blkptr = &dn->dn_phys->dn_blkptr[db->db_blkid];
|
|
DBUF_VERIFY(db);
|
|
} else {
|
|
dmu_buf_impl_t *parent = db->db_parent;
|
|
int epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
|
|
|
|
ASSERT(dn->dn_phys->dn_nlevels > 1);
|
|
if (parent == NULL) {
|
|
mutex_exit(&db->db_mtx);
|
|
rw_enter(&dn->dn_struct_rwlock, RW_READER);
|
|
parent = dbuf_hold_level(dn, db->db_level + 1,
|
|
db->db_blkid >> epbs, db);
|
|
rw_exit(&dn->dn_struct_rwlock);
|
|
mutex_enter(&db->db_mtx);
|
|
db->db_parent = parent;
|
|
}
|
|
db->db_blkptr = (blkptr_t *)parent->db.db_data +
|
|
(db->db_blkid & ((1ULL << epbs) - 1));
|
|
DBUF_VERIFY(db);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dbuf_sync_bonus(dbuf_dirty_record_t *dr, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = dr->dr_dbuf;
|
|
void *data = dr->dt.dl.dr_data;
|
|
|
|
ASSERT0(db->db_level);
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
ASSERT(db->db_blkid == DMU_BONUS_BLKID);
|
|
ASSERT(data != NULL);
|
|
|
|
dnode_t *dn = dr->dr_dnode;
|
|
ASSERT3U(DN_MAX_BONUS_LEN(dn->dn_phys), <=,
|
|
DN_SLOTS_TO_BONUSLEN(dn->dn_phys->dn_extra_slots + 1));
|
|
memcpy(DN_BONUS(dn->dn_phys), data, DN_MAX_BONUS_LEN(dn->dn_phys));
|
|
|
|
dbuf_sync_leaf_verify_bonus_dnode(dr);
|
|
|
|
dbuf_undirty_bonus(dr);
|
|
dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg, B_FALSE);
|
|
}
|
|
|
|
/*
|
|
* When syncing out a blocks of dnodes, adjust the block to deal with
|
|
* encryption. Normally, we make sure the block is decrypted before writing
|
|
* it. If we have crypt params, then we are writing a raw (encrypted) block,
|
|
* from a raw receive. In this case, set the ARC buf's crypt params so
|
|
* that the BP will be filled with the correct byteorder, salt, iv, and mac.
|
|
*/
|
|
static void
|
|
dbuf_prepare_encrypted_dnode_leaf(dbuf_dirty_record_t *dr)
|
|
{
|
|
int err;
|
|
dmu_buf_impl_t *db = dr->dr_dbuf;
|
|
|
|
ASSERT(MUTEX_HELD(&db->db_mtx));
|
|
ASSERT3U(db->db.db_object, ==, DMU_META_DNODE_OBJECT);
|
|
ASSERT3U(db->db_level, ==, 0);
|
|
|
|
if (!db->db_objset->os_raw_receive && arc_is_encrypted(db->db_buf)) {
|
|
zbookmark_phys_t zb;
|
|
|
|
/*
|
|
* Unfortunately, there is currently no mechanism for
|
|
* syncing context to handle decryption errors. An error
|
|
* here is only possible if an attacker maliciously
|
|
* changed a dnode block and updated the associated
|
|
* checksums going up the block tree.
|
|
*/
|
|
SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
|
|
db->db.db_object, db->db_level, db->db_blkid);
|
|
err = arc_untransform(db->db_buf, db->db_objset->os_spa,
|
|
&zb, B_TRUE);
|
|
if (err)
|
|
panic("Invalid dnode block MAC");
|
|
} else if (dr->dt.dl.dr_has_raw_params) {
|
|
(void) arc_release(dr->dt.dl.dr_data, db);
|
|
arc_convert_to_raw(dr->dt.dl.dr_data,
|
|
dmu_objset_id(db->db_objset),
|
|
dr->dt.dl.dr_byteorder, DMU_OT_DNODE,
|
|
dr->dt.dl.dr_salt, dr->dt.dl.dr_iv, dr->dt.dl.dr_mac);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* dbuf_sync_indirect() is called recursively from dbuf_sync_list() so it
|
|
* is critical the we not allow the compiler to inline this function in to
|
|
* dbuf_sync_list() thereby drastically bloating the stack usage.
|
|
*/
|
|
noinline static void
|
|
dbuf_sync_indirect(dbuf_dirty_record_t *dr, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = dr->dr_dbuf;
|
|
dnode_t *dn = dr->dr_dnode;
|
|
|
|
ASSERT(dmu_tx_is_syncing(tx));
|
|
|
|
dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr);
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
|
|
ASSERT(db->db_level > 0);
|
|
DBUF_VERIFY(db);
|
|
|
|
/* Read the block if it hasn't been read yet. */
|
|
if (db->db_buf == NULL) {
|
|
mutex_exit(&db->db_mtx);
|
|
(void) dbuf_read(db, NULL, DB_RF_MUST_SUCCEED);
|
|
mutex_enter(&db->db_mtx);
|
|
}
|
|
ASSERT3U(db->db_state, ==, DB_CACHED);
|
|
ASSERT(db->db_buf != NULL);
|
|
|
|
/* Indirect block size must match what the dnode thinks it is. */
|
|
ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift);
|
|
dbuf_check_blkptr(dn, db);
|
|
|
|
/* Provide the pending dirty record to child dbufs */
|
|
db->db_data_pending = dr;
|
|
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
dbuf_write(dr, db->db_buf, tx);
|
|
|
|
zio_t *zio = dr->dr_zio;
|
|
mutex_enter(&dr->dt.di.dr_mtx);
|
|
dbuf_sync_list(&dr->dt.di.dr_children, db->db_level - 1, tx);
|
|
ASSERT(list_head(&dr->dt.di.dr_children) == NULL);
|
|
mutex_exit(&dr->dt.di.dr_mtx);
|
|
zio_nowait(zio);
|
|
}
|
|
|
|
/*
|
|
* Verify that the size of the data in our bonus buffer does not exceed
|
|
* its recorded size.
|
|
*
|
|
* The purpose of this verification is to catch any cases in development
|
|
* where the size of a phys structure (i.e space_map_phys_t) grows and,
|
|
* due to incorrect feature management, older pools expect to read more
|
|
* data even though they didn't actually write it to begin with.
|
|
*
|
|
* For a example, this would catch an error in the feature logic where we
|
|
* open an older pool and we expect to write the space map histogram of
|
|
* a space map with size SPACE_MAP_SIZE_V0.
|
|
*/
|
|
static void
|
|
dbuf_sync_leaf_verify_bonus_dnode(dbuf_dirty_record_t *dr)
|
|
{
|
|
#ifdef ZFS_DEBUG
|
|
dnode_t *dn = dr->dr_dnode;
|
|
|
|
/*
|
|
* Encrypted bonus buffers can have data past their bonuslen.
|
|
* Skip the verification of these blocks.
|
|
*/
|
|
if (DMU_OT_IS_ENCRYPTED(dn->dn_bonustype))
|
|
return;
|
|
|
|
uint16_t bonuslen = dn->dn_phys->dn_bonuslen;
|
|
uint16_t maxbonuslen = DN_SLOTS_TO_BONUSLEN(dn->dn_num_slots);
|
|
ASSERT3U(bonuslen, <=, maxbonuslen);
|
|
|
|
arc_buf_t *datap = dr->dt.dl.dr_data;
|
|
char *datap_end = ((char *)datap) + bonuslen;
|
|
char *datap_max = ((char *)datap) + maxbonuslen;
|
|
|
|
/* ensure that everything is zero after our data */
|
|
for (; datap_end < datap_max; datap_end++)
|
|
ASSERT(*datap_end == 0);
|
|
#endif
|
|
}
|
|
|
|
static blkptr_t *
|
|
dbuf_lightweight_bp(dbuf_dirty_record_t *dr)
|
|
{
|
|
/* This must be a lightweight dirty record. */
|
|
ASSERT3P(dr->dr_dbuf, ==, NULL);
|
|
dnode_t *dn = dr->dr_dnode;
|
|
|
|
if (dn->dn_phys->dn_nlevels == 1) {
|
|
VERIFY3U(dr->dt.dll.dr_blkid, <, dn->dn_phys->dn_nblkptr);
|
|
return (&dn->dn_phys->dn_blkptr[dr->dt.dll.dr_blkid]);
|
|
} else {
|
|
dmu_buf_impl_t *parent_db = dr->dr_parent->dr_dbuf;
|
|
int epbs = dn->dn_indblkshift - SPA_BLKPTRSHIFT;
|
|
VERIFY3U(parent_db->db_level, ==, 1);
|
|
VERIFY3P(parent_db->db_dnode_handle->dnh_dnode, ==, dn);
|
|
VERIFY3U(dr->dt.dll.dr_blkid >> epbs, ==, parent_db->db_blkid);
|
|
blkptr_t *bp = parent_db->db.db_data;
|
|
return (&bp[dr->dt.dll.dr_blkid & ((1 << epbs) - 1)]);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dbuf_lightweight_ready(zio_t *zio)
|
|
{
|
|
dbuf_dirty_record_t *dr = zio->io_private;
|
|
blkptr_t *bp = zio->io_bp;
|
|
|
|
if (zio->io_error != 0)
|
|
return;
|
|
|
|
dnode_t *dn = dr->dr_dnode;
|
|
|
|
blkptr_t *bp_orig = dbuf_lightweight_bp(dr);
|
|
spa_t *spa = dmu_objset_spa(dn->dn_objset);
|
|
int64_t delta = bp_get_dsize_sync(spa, bp) -
|
|
bp_get_dsize_sync(spa, bp_orig);
|
|
dnode_diduse_space(dn, delta);
|
|
|
|
uint64_t blkid = dr->dt.dll.dr_blkid;
|
|
mutex_enter(&dn->dn_mtx);
|
|
if (blkid > dn->dn_phys->dn_maxblkid) {
|
|
ASSERT0(dn->dn_objset->os_raw_receive);
|
|
dn->dn_phys->dn_maxblkid = blkid;
|
|
}
|
|
mutex_exit(&dn->dn_mtx);
|
|
|
|
if (!BP_IS_EMBEDDED(bp)) {
|
|
uint64_t fill = BP_IS_HOLE(bp) ? 0 : 1;
|
|
BP_SET_FILL(bp, fill);
|
|
}
|
|
|
|
dmu_buf_impl_t *parent_db;
|
|
EQUIV(dr->dr_parent == NULL, dn->dn_phys->dn_nlevels == 1);
|
|
if (dr->dr_parent == NULL) {
|
|
parent_db = dn->dn_dbuf;
|
|
} else {
|
|
parent_db = dr->dr_parent->dr_dbuf;
|
|
}
|
|
rw_enter(&parent_db->db_rwlock, RW_WRITER);
|
|
*bp_orig = *bp;
|
|
rw_exit(&parent_db->db_rwlock);
|
|
}
|
|
|
|
static void
|
|
dbuf_lightweight_done(zio_t *zio)
|
|
{
|
|
dbuf_dirty_record_t *dr = zio->io_private;
|
|
|
|
VERIFY0(zio->io_error);
|
|
|
|
objset_t *os = dr->dr_dnode->dn_objset;
|
|
dmu_tx_t *tx = os->os_synctx;
|
|
|
|
if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) {
|
|
ASSERT(BP_EQUAL(zio->io_bp, &zio->io_bp_orig));
|
|
} else {
|
|
dsl_dataset_t *ds = os->os_dsl_dataset;
|
|
(void) dsl_dataset_block_kill(ds, &zio->io_bp_orig, tx, B_TRUE);
|
|
dsl_dataset_block_born(ds, zio->io_bp, tx);
|
|
}
|
|
|
|
dsl_pool_undirty_space(dmu_objset_pool(os), dr->dr_accounted,
|
|
zio->io_txg);
|
|
|
|
abd_free(dr->dt.dll.dr_abd);
|
|
kmem_free(dr, sizeof (*dr));
|
|
}
|
|
|
|
noinline static void
|
|
dbuf_sync_lightweight(dbuf_dirty_record_t *dr, dmu_tx_t *tx)
|
|
{
|
|
dnode_t *dn = dr->dr_dnode;
|
|
zio_t *pio;
|
|
if (dn->dn_phys->dn_nlevels == 1) {
|
|
pio = dn->dn_zio;
|
|
} else {
|
|
pio = dr->dr_parent->dr_zio;
|
|
}
|
|
|
|
zbookmark_phys_t zb = {
|
|
.zb_objset = dmu_objset_id(dn->dn_objset),
|
|
.zb_object = dn->dn_object,
|
|
.zb_level = 0,
|
|
.zb_blkid = dr->dt.dll.dr_blkid,
|
|
};
|
|
|
|
/*
|
|
* See comment in dbuf_write(). This is so that zio->io_bp_orig
|
|
* will have the old BP in dbuf_lightweight_done().
|
|
*/
|
|
dr->dr_bp_copy = *dbuf_lightweight_bp(dr);
|
|
|
|
dr->dr_zio = zio_write(pio, dmu_objset_spa(dn->dn_objset),
|
|
dmu_tx_get_txg(tx), &dr->dr_bp_copy, dr->dt.dll.dr_abd,
|
|
dn->dn_datablksz, abd_get_size(dr->dt.dll.dr_abd),
|
|
&dr->dt.dll.dr_props, dbuf_lightweight_ready, NULL,
|
|
dbuf_lightweight_done, dr, ZIO_PRIORITY_ASYNC_WRITE,
|
|
ZIO_FLAG_MUSTSUCCEED | dr->dt.dll.dr_flags, &zb);
|
|
|
|
zio_nowait(dr->dr_zio);
|
|
}
|
|
|
|
/*
|
|
* dbuf_sync_leaf() is called recursively from dbuf_sync_list() so it is
|
|
* critical the we not allow the compiler to inline this function in to
|
|
* dbuf_sync_list() thereby drastically bloating the stack usage.
|
|
*/
|
|
noinline static void
|
|
dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx)
|
|
{
|
|
arc_buf_t **datap = &dr->dt.dl.dr_data;
|
|
dmu_buf_impl_t *db = dr->dr_dbuf;
|
|
dnode_t *dn = dr->dr_dnode;
|
|
objset_t *os;
|
|
uint64_t txg = tx->tx_txg;
|
|
|
|
ASSERT(dmu_tx_is_syncing(tx));
|
|
|
|
dprintf_dbuf_bp(db, db->db_blkptr, "blkptr=%p", db->db_blkptr);
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
/*
|
|
* To be synced, we must be dirtied. But we
|
|
* might have been freed after the dirty.
|
|
*/
|
|
if (db->db_state == DB_UNCACHED) {
|
|
/* This buffer has been freed since it was dirtied */
|
|
ASSERT(db->db.db_data == NULL);
|
|
} else if (db->db_state == DB_FILL) {
|
|
/* This buffer was freed and is now being re-filled */
|
|
ASSERT(db->db.db_data != dr->dt.dl.dr_data);
|
|
} else if (db->db_state == DB_READ) {
|
|
/*
|
|
* This buffer has a clone we need to write, and an in-flight
|
|
* read on the BP we're about to clone. Its safe to issue the
|
|
* write here because the read has already been issued and the
|
|
* contents won't change.
|
|
*/
|
|
ASSERT(dr->dt.dl.dr_brtwrite &&
|
|
dr->dt.dl.dr_override_state == DR_OVERRIDDEN);
|
|
} else {
|
|
ASSERT(db->db_state == DB_CACHED || db->db_state == DB_NOFILL);
|
|
}
|
|
DBUF_VERIFY(db);
|
|
|
|
if (db->db_blkid == DMU_SPILL_BLKID) {
|
|
mutex_enter(&dn->dn_mtx);
|
|
if (!(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR)) {
|
|
/*
|
|
* In the previous transaction group, the bonus buffer
|
|
* was entirely used to store the attributes for the
|
|
* dnode which overrode the dn_spill field. However,
|
|
* when adding more attributes to the file a spill
|
|
* block was required to hold the extra attributes.
|
|
*
|
|
* Make sure to clear the garbage left in the dn_spill
|
|
* field from the previous attributes in the bonus
|
|
* buffer. Otherwise, after writing out the spill
|
|
* block to the new allocated dva, it will free
|
|
* the old block pointed to by the invalid dn_spill.
|
|
*/
|
|
db->db_blkptr = NULL;
|
|
}
|
|
dn->dn_phys->dn_flags |= DNODE_FLAG_SPILL_BLKPTR;
|
|
mutex_exit(&dn->dn_mtx);
|
|
}
|
|
|
|
/*
|
|
* If this is a bonus buffer, simply copy the bonus data into the
|
|
* dnode. It will be written out when the dnode is synced (and it
|
|
* will be synced, since it must have been dirty for dbuf_sync to
|
|
* be called).
|
|
*/
|
|
if (db->db_blkid == DMU_BONUS_BLKID) {
|
|
ASSERT(dr->dr_dbuf == db);
|
|
dbuf_sync_bonus(dr, tx);
|
|
return;
|
|
}
|
|
|
|
os = dn->dn_objset;
|
|
|
|
/*
|
|
* This function may have dropped the db_mtx lock allowing a dmu_sync
|
|
* operation to sneak in. As a result, we need to ensure that we
|
|
* don't check the dr_override_state until we have returned from
|
|
* dbuf_check_blkptr.
|
|
*/
|
|
dbuf_check_blkptr(dn, db);
|
|
|
|
/*
|
|
* If this buffer is in the middle of an immediate write,
|
|
* wait for the synchronous IO to complete.
|
|
*/
|
|
while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC) {
|
|
ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT);
|
|
cv_wait(&db->db_changed, &db->db_mtx);
|
|
}
|
|
|
|
/*
|
|
* If this is a dnode block, ensure it is appropriately encrypted
|
|
* or decrypted, depending on what we are writing to it this txg.
|
|
*/
|
|
if (os->os_encrypted && dn->dn_object == DMU_META_DNODE_OBJECT)
|
|
dbuf_prepare_encrypted_dnode_leaf(dr);
|
|
|
|
if (db->db_state != DB_NOFILL &&
|
|
dn->dn_object != DMU_META_DNODE_OBJECT &&
|
|
zfs_refcount_count(&db->db_holds) > 1 &&
|
|
dr->dt.dl.dr_override_state != DR_OVERRIDDEN &&
|
|
*datap == db->db_buf) {
|
|
/*
|
|
* If this buffer is currently "in use" (i.e., there
|
|
* are active holds and db_data still references it),
|
|
* then make a copy before we start the write so that
|
|
* any modifications from the open txg will not leak
|
|
* into this write.
|
|
*
|
|
* NOTE: this copy does not need to be made for
|
|
* objects only modified in the syncing context (e.g.
|
|
* DNONE_DNODE blocks).
|
|
*/
|
|
int psize = arc_buf_size(*datap);
|
|
int lsize = arc_buf_lsize(*datap);
|
|
arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
|
|
enum zio_compress compress_type = arc_get_compression(*datap);
|
|
uint8_t complevel = arc_get_complevel(*datap);
|
|
|
|
if (arc_is_encrypted(*datap)) {
|
|
boolean_t byteorder;
|
|
uint8_t salt[ZIO_DATA_SALT_LEN];
|
|
uint8_t iv[ZIO_DATA_IV_LEN];
|
|
uint8_t mac[ZIO_DATA_MAC_LEN];
|
|
|
|
arc_get_raw_params(*datap, &byteorder, salt, iv, mac);
|
|
*datap = arc_alloc_raw_buf(os->os_spa, db,
|
|
dmu_objset_id(os), byteorder, salt, iv, mac,
|
|
dn->dn_type, psize, lsize, compress_type,
|
|
complevel);
|
|
} else if (compress_type != ZIO_COMPRESS_OFF) {
|
|
ASSERT3U(type, ==, ARC_BUFC_DATA);
|
|
*datap = arc_alloc_compressed_buf(os->os_spa, db,
|
|
psize, lsize, compress_type, complevel);
|
|
} else {
|
|
*datap = arc_alloc_buf(os->os_spa, db, type, psize);
|
|
}
|
|
memcpy((*datap)->b_data, db->db.db_data, psize);
|
|
}
|
|
db->db_data_pending = dr;
|
|
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
dbuf_write(dr, *datap, tx);
|
|
|
|
ASSERT(!list_link_active(&dr->dr_dirty_node));
|
|
if (dn->dn_object == DMU_META_DNODE_OBJECT) {
|
|
list_insert_tail(&dn->dn_dirty_records[txg & TXG_MASK], dr);
|
|
} else {
|
|
zio_nowait(dr->dr_zio);
|
|
}
|
|
}
|
|
|
|
void
|
|
dbuf_sync_list(list_t *list, int level, dmu_tx_t *tx)
|
|
{
|
|
dbuf_dirty_record_t *dr;
|
|
|
|
while ((dr = list_head(list))) {
|
|
if (dr->dr_zio != NULL) {
|
|
/*
|
|
* If we find an already initialized zio then we
|
|
* are processing the meta-dnode, and we have finished.
|
|
* The dbufs for all dnodes are put back on the list
|
|
* during processing, so that we can zio_wait()
|
|
* these IOs after initiating all child IOs.
|
|
*/
|
|
ASSERT3U(dr->dr_dbuf->db.db_object, ==,
|
|
DMU_META_DNODE_OBJECT);
|
|
break;
|
|
}
|
|
list_remove(list, dr);
|
|
if (dr->dr_dbuf == NULL) {
|
|
dbuf_sync_lightweight(dr, tx);
|
|
} else {
|
|
if (dr->dr_dbuf->db_blkid != DMU_BONUS_BLKID &&
|
|
dr->dr_dbuf->db_blkid != DMU_SPILL_BLKID) {
|
|
VERIFY3U(dr->dr_dbuf->db_level, ==, level);
|
|
}
|
|
if (dr->dr_dbuf->db_level > 0)
|
|
dbuf_sync_indirect(dr, tx);
|
|
else
|
|
dbuf_sync_leaf(dr, tx);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
dbuf_write_ready(zio_t *zio, arc_buf_t *buf, void *vdb)
|
|
{
|
|
(void) buf;
|
|
dmu_buf_impl_t *db = vdb;
|
|
dnode_t *dn;
|
|
blkptr_t *bp = zio->io_bp;
|
|
blkptr_t *bp_orig = &zio->io_bp_orig;
|
|
spa_t *spa = zio->io_spa;
|
|
int64_t delta;
|
|
uint64_t fill = 0;
|
|
int i;
|
|
|
|
ASSERT3P(db->db_blkptr, !=, NULL);
|
|
ASSERT3P(&db->db_data_pending->dr_bp_copy, ==, bp);
|
|
|
|
DB_DNODE_ENTER(db);
|
|
dn = DB_DNODE(db);
|
|
delta = bp_get_dsize_sync(spa, bp) - bp_get_dsize_sync(spa, bp_orig);
|
|
dnode_diduse_space(dn, delta - zio->io_prev_space_delta);
|
|
zio->io_prev_space_delta = delta;
|
|
|
|
if (bp->blk_birth != 0) {
|
|
ASSERT((db->db_blkid != DMU_SPILL_BLKID &&
|
|
BP_GET_TYPE(bp) == dn->dn_type) ||
|
|
(db->db_blkid == DMU_SPILL_BLKID &&
|
|
BP_GET_TYPE(bp) == dn->dn_bonustype) ||
|
|
BP_IS_EMBEDDED(bp));
|
|
ASSERT(BP_GET_LEVEL(bp) == db->db_level);
|
|
}
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
|
|
#ifdef ZFS_DEBUG
|
|
if (db->db_blkid == DMU_SPILL_BLKID) {
|
|
ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR);
|
|
ASSERT(!(BP_IS_HOLE(bp)) &&
|
|
db->db_blkptr == DN_SPILL_BLKPTR(dn->dn_phys));
|
|
}
|
|
#endif
|
|
|
|
if (db->db_level == 0) {
|
|
mutex_enter(&dn->dn_mtx);
|
|
if (db->db_blkid > dn->dn_phys->dn_maxblkid &&
|
|
db->db_blkid != DMU_SPILL_BLKID) {
|
|
ASSERT0(db->db_objset->os_raw_receive);
|
|
dn->dn_phys->dn_maxblkid = db->db_blkid;
|
|
}
|
|
mutex_exit(&dn->dn_mtx);
|
|
|
|
if (dn->dn_type == DMU_OT_DNODE) {
|
|
i = 0;
|
|
while (i < db->db.db_size) {
|
|
dnode_phys_t *dnp =
|
|
(void *)(((char *)db->db.db_data) + i);
|
|
|
|
i += DNODE_MIN_SIZE;
|
|
if (dnp->dn_type != DMU_OT_NONE) {
|
|
fill++;
|
|
for (int j = 0; j < dnp->dn_nblkptr;
|
|
j++) {
|
|
(void) zfs_blkptr_verify(spa,
|
|
&dnp->dn_blkptr[j],
|
|
BLK_CONFIG_SKIP,
|
|
BLK_VERIFY_HALT);
|
|
}
|
|
if (dnp->dn_flags &
|
|
DNODE_FLAG_SPILL_BLKPTR) {
|
|
(void) zfs_blkptr_verify(spa,
|
|
DN_SPILL_BLKPTR(dnp),
|
|
BLK_CONFIG_SKIP,
|
|
BLK_VERIFY_HALT);
|
|
}
|
|
i += dnp->dn_extra_slots *
|
|
DNODE_MIN_SIZE;
|
|
}
|
|
}
|
|
} else {
|
|
if (BP_IS_HOLE(bp)) {
|
|
fill = 0;
|
|
} else {
|
|
fill = 1;
|
|
}
|
|
}
|
|
} else {
|
|
blkptr_t *ibp = db->db.db_data;
|
|
ASSERT3U(db->db.db_size, ==, 1<<dn->dn_phys->dn_indblkshift);
|
|
for (i = db->db.db_size >> SPA_BLKPTRSHIFT; i > 0; i--, ibp++) {
|
|
if (BP_IS_HOLE(ibp))
|
|
continue;
|
|
(void) zfs_blkptr_verify(spa, ibp,
|
|
BLK_CONFIG_SKIP, BLK_VERIFY_HALT);
|
|
fill += BP_GET_FILL(ibp);
|
|
}
|
|
}
|
|
DB_DNODE_EXIT(db);
|
|
|
|
if (!BP_IS_EMBEDDED(bp))
|
|
BP_SET_FILL(bp, fill);
|
|
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
db_lock_type_t dblt = dmu_buf_lock_parent(db, RW_WRITER, FTAG);
|
|
*db->db_blkptr = *bp;
|
|
dmu_buf_unlock_parent(db, dblt, FTAG);
|
|
}
|
|
|
|
/*
|
|
* This function gets called just prior to running through the compression
|
|
* stage of the zio pipeline. If we're an indirect block comprised of only
|
|
* holes, then we want this indirect to be compressed away to a hole. In
|
|
* order to do that we must zero out any information about the holes that
|
|
* this indirect points to prior to before we try to compress it.
|
|
*/
|
|
static void
|
|
dbuf_write_children_ready(zio_t *zio, arc_buf_t *buf, void *vdb)
|
|
{
|
|
(void) zio, (void) buf;
|
|
dmu_buf_impl_t *db = vdb;
|
|
dnode_t *dn;
|
|
blkptr_t *bp;
|
|
unsigned int epbs, i;
|
|
|
|
ASSERT3U(db->db_level, >, 0);
|
|
DB_DNODE_ENTER(db);
|
|
dn = DB_DNODE(db);
|
|
epbs = dn->dn_phys->dn_indblkshift - SPA_BLKPTRSHIFT;
|
|
ASSERT3U(epbs, <, 31);
|
|
|
|
/* Determine if all our children are holes */
|
|
for (i = 0, bp = db->db.db_data; i < 1ULL << epbs; i++, bp++) {
|
|
if (!BP_IS_HOLE(bp))
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If all the children are holes, then zero them all out so that
|
|
* we may get compressed away.
|
|
*/
|
|
if (i == 1ULL << epbs) {
|
|
/*
|
|
* We only found holes. Grab the rwlock to prevent
|
|
* anybody from reading the blocks we're about to
|
|
* zero out.
|
|
*/
|
|
rw_enter(&db->db_rwlock, RW_WRITER);
|
|
memset(db->db.db_data, 0, db->db.db_size);
|
|
rw_exit(&db->db_rwlock);
|
|
}
|
|
DB_DNODE_EXIT(db);
|
|
}
|
|
|
|
static void
|
|
dbuf_write_done(zio_t *zio, arc_buf_t *buf, void *vdb)
|
|
{
|
|
(void) buf;
|
|
dmu_buf_impl_t *db = vdb;
|
|
blkptr_t *bp_orig = &zio->io_bp_orig;
|
|
blkptr_t *bp = db->db_blkptr;
|
|
objset_t *os = db->db_objset;
|
|
dmu_tx_t *tx = os->os_synctx;
|
|
|
|
ASSERT0(zio->io_error);
|
|
ASSERT(db->db_blkptr == bp);
|
|
|
|
/*
|
|
* For nopwrites and rewrites we ensure that the bp matches our
|
|
* original and bypass all the accounting.
|
|
*/
|
|
if (zio->io_flags & (ZIO_FLAG_IO_REWRITE | ZIO_FLAG_NOPWRITE)) {
|
|
ASSERT(BP_EQUAL(bp, bp_orig));
|
|
} else {
|
|
dsl_dataset_t *ds = os->os_dsl_dataset;
|
|
(void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE);
|
|
dsl_dataset_block_born(ds, bp, tx);
|
|
}
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
|
|
DBUF_VERIFY(db);
|
|
|
|
dbuf_dirty_record_t *dr = db->db_data_pending;
|
|
dnode_t *dn = dr->dr_dnode;
|
|
ASSERT(!list_link_active(&dr->dr_dirty_node));
|
|
ASSERT(dr->dr_dbuf == db);
|
|
ASSERT(list_next(&db->db_dirty_records, dr) == NULL);
|
|
list_remove(&db->db_dirty_records, dr);
|
|
|
|
#ifdef ZFS_DEBUG
|
|
if (db->db_blkid == DMU_SPILL_BLKID) {
|
|
ASSERT(dn->dn_phys->dn_flags & DNODE_FLAG_SPILL_BLKPTR);
|
|
ASSERT(!(BP_IS_HOLE(db->db_blkptr)) &&
|
|
db->db_blkptr == DN_SPILL_BLKPTR(dn->dn_phys));
|
|
}
|
|
#endif
|
|
|
|
if (db->db_level == 0) {
|
|
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
|
|
ASSERT(dr->dt.dl.dr_override_state == DR_NOT_OVERRIDDEN);
|
|
if (db->db_state != DB_NOFILL) {
|
|
if (dr->dt.dl.dr_data != NULL &&
|
|
dr->dt.dl.dr_data != db->db_buf) {
|
|
arc_buf_destroy(dr->dt.dl.dr_data, db);
|
|
}
|
|
}
|
|
} else {
|
|
ASSERT(list_head(&dr->dt.di.dr_children) == NULL);
|
|
ASSERT3U(db->db.db_size, ==, 1 << dn->dn_phys->dn_indblkshift);
|
|
if (!BP_IS_HOLE(db->db_blkptr)) {
|
|
int epbs __maybe_unused = dn->dn_phys->dn_indblkshift -
|
|
SPA_BLKPTRSHIFT;
|
|
ASSERT3U(db->db_blkid, <=,
|
|
dn->dn_phys->dn_maxblkid >> (db->db_level * epbs));
|
|
ASSERT3U(BP_GET_LSIZE(db->db_blkptr), ==,
|
|
db->db.db_size);
|
|
}
|
|
mutex_destroy(&dr->dt.di.dr_mtx);
|
|
list_destroy(&dr->dt.di.dr_children);
|
|
}
|
|
|
|
cv_broadcast(&db->db_changed);
|
|
ASSERT(db->db_dirtycnt > 0);
|
|
db->db_dirtycnt -= 1;
|
|
db->db_data_pending = NULL;
|
|
dbuf_rele_and_unlock(db, (void *)(uintptr_t)tx->tx_txg, B_FALSE);
|
|
|
|
dsl_pool_undirty_space(dmu_objset_pool(os), dr->dr_accounted,
|
|
zio->io_txg);
|
|
|
|
kmem_free(dr, sizeof (dbuf_dirty_record_t));
|
|
}
|
|
|
|
static void
|
|
dbuf_write_nofill_ready(zio_t *zio)
|
|
{
|
|
dbuf_write_ready(zio, NULL, zio->io_private);
|
|
}
|
|
|
|
static void
|
|
dbuf_write_nofill_done(zio_t *zio)
|
|
{
|
|
dbuf_write_done(zio, NULL, zio->io_private);
|
|
}
|
|
|
|
static void
|
|
dbuf_write_override_ready(zio_t *zio)
|
|
{
|
|
dbuf_dirty_record_t *dr = zio->io_private;
|
|
dmu_buf_impl_t *db = dr->dr_dbuf;
|
|
|
|
dbuf_write_ready(zio, NULL, db);
|
|
}
|
|
|
|
static void
|
|
dbuf_write_override_done(zio_t *zio)
|
|
{
|
|
dbuf_dirty_record_t *dr = zio->io_private;
|
|
dmu_buf_impl_t *db = dr->dr_dbuf;
|
|
blkptr_t *obp = &dr->dt.dl.dr_overridden_by;
|
|
|
|
mutex_enter(&db->db_mtx);
|
|
if (!BP_EQUAL(zio->io_bp, obp)) {
|
|
if (!BP_IS_HOLE(obp))
|
|
dsl_free(spa_get_dsl(zio->io_spa), zio->io_txg, obp);
|
|
arc_release(dr->dt.dl.dr_data, db);
|
|
}
|
|
mutex_exit(&db->db_mtx);
|
|
|
|
dbuf_write_done(zio, NULL, db);
|
|
|
|
if (zio->io_abd != NULL)
|
|
abd_free(zio->io_abd);
|
|
}
|
|
|
|
typedef struct dbuf_remap_impl_callback_arg {
|
|
objset_t *drica_os;
|
|
uint64_t drica_blk_birth;
|
|
dmu_tx_t *drica_tx;
|
|
} dbuf_remap_impl_callback_arg_t;
|
|
|
|
static void
|
|
dbuf_remap_impl_callback(uint64_t vdev, uint64_t offset, uint64_t size,
|
|
void *arg)
|
|
{
|
|
dbuf_remap_impl_callback_arg_t *drica = arg;
|
|
objset_t *os = drica->drica_os;
|
|
spa_t *spa = dmu_objset_spa(os);
|
|
dmu_tx_t *tx = drica->drica_tx;
|
|
|
|
ASSERT(dsl_pool_sync_context(spa_get_dsl(spa)));
|
|
|
|
if (os == spa_meta_objset(spa)) {
|
|
spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx);
|
|
} else {
|
|
dsl_dataset_block_remapped(dmu_objset_ds(os), vdev, offset,
|
|
size, drica->drica_blk_birth, tx);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dbuf_remap_impl(dnode_t *dn, blkptr_t *bp, krwlock_t *rw, dmu_tx_t *tx)
|
|
{
|
|
blkptr_t bp_copy = *bp;
|
|
spa_t *spa = dmu_objset_spa(dn->dn_objset);
|
|
dbuf_remap_impl_callback_arg_t drica;
|
|
|
|
ASSERT(dsl_pool_sync_context(spa_get_dsl(spa)));
|
|
|
|
drica.drica_os = dn->dn_objset;
|
|
drica.drica_blk_birth = bp->blk_birth;
|
|
drica.drica_tx = tx;
|
|
if (spa_remap_blkptr(spa, &bp_copy, dbuf_remap_impl_callback,
|
|
&drica)) {
|
|
/*
|
|
* If the blkptr being remapped is tracked by a livelist,
|
|
* then we need to make sure the livelist reflects the update.
|
|
* First, cancel out the old blkptr by appending a 'FREE'
|
|
* entry. Next, add an 'ALLOC' to track the new version. This
|
|
* way we avoid trying to free an inaccurate blkptr at delete.
|
|
* Note that embedded blkptrs are not tracked in livelists.
|
|
*/
|
|
if (dn->dn_objset != spa_meta_objset(spa)) {
|
|
dsl_dataset_t *ds = dmu_objset_ds(dn->dn_objset);
|
|
if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) &&
|
|
bp->blk_birth > ds->ds_dir->dd_origin_txg) {
|
|
ASSERT(!BP_IS_EMBEDDED(bp));
|
|
ASSERT(dsl_dir_is_clone(ds->ds_dir));
|
|
ASSERT(spa_feature_is_enabled(spa,
|
|
SPA_FEATURE_LIVELIST));
|
|
bplist_append(&ds->ds_dir->dd_pending_frees,
|
|
bp);
|
|
bplist_append(&ds->ds_dir->dd_pending_allocs,
|
|
&bp_copy);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The db_rwlock prevents dbuf_read_impl() from
|
|
* dereferencing the BP while we are changing it. To
|
|
* avoid lock contention, only grab it when we are actually
|
|
* changing the BP.
|
|
*/
|
|
if (rw != NULL)
|
|
rw_enter(rw, RW_WRITER);
|
|
*bp = bp_copy;
|
|
if (rw != NULL)
|
|
rw_exit(rw);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remap any existing BP's to concrete vdevs, if possible.
|
|
*/
|
|
static void
|
|
dbuf_remap(dnode_t *dn, dmu_buf_impl_t *db, dmu_tx_t *tx)
|
|
{
|
|
spa_t *spa = dmu_objset_spa(db->db_objset);
|
|
ASSERT(dsl_pool_sync_context(spa_get_dsl(spa)));
|
|
|
|
if (!spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL))
|
|
return;
|
|
|
|
if (db->db_level > 0) {
|
|
blkptr_t *bp = db->db.db_data;
|
|
for (int i = 0; i < db->db.db_size >> SPA_BLKPTRSHIFT; i++) {
|
|
dbuf_remap_impl(dn, &bp[i], &db->db_rwlock, tx);
|
|
}
|
|
} else if (db->db.db_object == DMU_META_DNODE_OBJECT) {
|
|
dnode_phys_t *dnp = db->db.db_data;
|
|
ASSERT3U(db->db_dnode_handle->dnh_dnode->dn_type, ==,
|
|
DMU_OT_DNODE);
|
|
for (int i = 0; i < db->db.db_size >> DNODE_SHIFT;
|
|
i += dnp[i].dn_extra_slots + 1) {
|
|
for (int j = 0; j < dnp[i].dn_nblkptr; j++) {
|
|
krwlock_t *lock = (dn->dn_dbuf == NULL ? NULL :
|
|
&dn->dn_dbuf->db_rwlock);
|
|
dbuf_remap_impl(dn, &dnp[i].dn_blkptr[j], lock,
|
|
tx);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* Issue I/O to commit a dirty buffer to disk. */
|
|
static void
|
|
dbuf_write(dbuf_dirty_record_t *dr, arc_buf_t *data, dmu_tx_t *tx)
|
|
{
|
|
dmu_buf_impl_t *db = dr->dr_dbuf;
|
|
dnode_t *dn = dr->dr_dnode;
|
|
objset_t *os;
|
|
dmu_buf_impl_t *parent = db->db_parent;
|
|
uint64_t txg = tx->tx_txg;
|
|
zbookmark_phys_t zb;
|
|
zio_prop_t zp;
|
|
zio_t *pio; /* parent I/O */
|
|
int wp_flag = 0;
|
|
|
|
ASSERT(dmu_tx_is_syncing(tx));
|
|
|
|
os = dn->dn_objset;
|
|
|
|
if (db->db_state != DB_NOFILL) {
|
|
if (db->db_level > 0 || dn->dn_type == DMU_OT_DNODE) {
|
|
/*
|
|
* Private object buffers are released here rather
|
|
* than in dbuf_dirty() since they are only modified
|
|
* in the syncing context and we don't want the
|
|
* overhead of making multiple copies of the data.
|
|
*/
|
|
if (BP_IS_HOLE(db->db_blkptr)) {
|
|
arc_buf_thaw(data);
|
|
} else {
|
|
dbuf_release_bp(db);
|
|
}
|
|
dbuf_remap(dn, db, tx);
|
|
}
|
|
}
|
|
|
|
if (parent != dn->dn_dbuf) {
|
|
/* Our parent is an indirect block. */
|
|
/* We have a dirty parent that has been scheduled for write. */
|
|
ASSERT(parent && parent->db_data_pending);
|
|
/* Our parent's buffer is one level closer to the dnode. */
|
|
ASSERT(db->db_level == parent->db_level-1);
|
|
/*
|
|
* We're about to modify our parent's db_data by modifying
|
|
* our block pointer, so the parent must be released.
|
|
*/
|
|
ASSERT(arc_released(parent->db_buf));
|
|
pio = parent->db_data_pending->dr_zio;
|
|
} else {
|
|
/* Our parent is the dnode itself. */
|
|
ASSERT((db->db_level == dn->dn_phys->dn_nlevels-1 &&
|
|
db->db_blkid != DMU_SPILL_BLKID) ||
|
|
(db->db_blkid == DMU_SPILL_BLKID && db->db_level == 0));
|
|
if (db->db_blkid != DMU_SPILL_BLKID)
|
|
ASSERT3P(db->db_blkptr, ==,
|
|
&dn->dn_phys->dn_blkptr[db->db_blkid]);
|
|
pio = dn->dn_zio;
|
|
}
|
|
|
|
ASSERT(db->db_level == 0 || data == db->db_buf);
|
|
ASSERT3U(db->db_blkptr->blk_birth, <=, txg);
|
|
ASSERT(pio);
|
|
|
|
SET_BOOKMARK(&zb, os->os_dsl_dataset ?
|
|
os->os_dsl_dataset->ds_object : DMU_META_OBJSET,
|
|
db->db.db_object, db->db_level, db->db_blkid);
|
|
|
|
if (db->db_blkid == DMU_SPILL_BLKID)
|
|
wp_flag = WP_SPILL;
|
|
wp_flag |= (db->db_state == DB_NOFILL) ? WP_NOFILL : 0;
|
|
|
|
dmu_write_policy(os, dn, db->db_level, wp_flag, &zp);
|
|
|
|
/*
|
|
* We copy the blkptr now (rather than when we instantiate the dirty
|
|
* record), because its value can change between open context and
|
|
* syncing context. We do not need to hold dn_struct_rwlock to read
|
|
* db_blkptr because we are in syncing context.
|
|
*/
|
|
dr->dr_bp_copy = *db->db_blkptr;
|
|
|
|
if (db->db_level == 0 &&
|
|
dr->dt.dl.dr_override_state == DR_OVERRIDDEN) {
|
|
/*
|
|
* The BP for this block has been provided by open context
|
|
* (by dmu_sync() or dmu_buf_write_embedded()).
|
|
*/
|
|
abd_t *contents = (data != NULL) ?
|
|
abd_get_from_buf(data->b_data, arc_buf_size(data)) : NULL;
|
|
|
|
dr->dr_zio = zio_write(pio, os->os_spa, txg, &dr->dr_bp_copy,
|
|
contents, db->db.db_size, db->db.db_size, &zp,
|
|
dbuf_write_override_ready, NULL,
|
|
dbuf_write_override_done,
|
|
dr, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);
|
|
mutex_enter(&db->db_mtx);
|
|
dr->dt.dl.dr_override_state = DR_NOT_OVERRIDDEN;
|
|
zio_write_override(dr->dr_zio, &dr->dt.dl.dr_overridden_by,
|
|
dr->dt.dl.dr_copies, dr->dt.dl.dr_nopwrite,
|
|
dr->dt.dl.dr_brtwrite);
|
|
mutex_exit(&db->db_mtx);
|
|
} else if (db->db_state == DB_NOFILL) {
|
|
ASSERT(zp.zp_checksum == ZIO_CHECKSUM_OFF ||
|
|
zp.zp_checksum == ZIO_CHECKSUM_NOPARITY);
|
|
dr->dr_zio = zio_write(pio, os->os_spa, txg,
|
|
&dr->dr_bp_copy, NULL, db->db.db_size, db->db.db_size, &zp,
|
|
dbuf_write_nofill_ready, NULL,
|
|
dbuf_write_nofill_done, db,
|
|
ZIO_PRIORITY_ASYNC_WRITE,
|
|
ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_NODATA, &zb);
|
|
} else {
|
|
ASSERT(arc_released(data));
|
|
|
|
/*
|
|
* For indirect blocks, we want to setup the children
|
|
* ready callback so that we can properly handle an indirect
|
|
* block that only contains holes.
|
|
*/
|
|
arc_write_done_func_t *children_ready_cb = NULL;
|
|
if (db->db_level != 0)
|
|
children_ready_cb = dbuf_write_children_ready;
|
|
|
|
dr->dr_zio = arc_write(pio, os->os_spa, txg,
|
|
&dr->dr_bp_copy, data, !DBUF_IS_CACHEABLE(db),
|
|
dbuf_is_l2cacheable(db), &zp, dbuf_write_ready,
|
|
children_ready_cb, dbuf_write_done, db,
|
|
ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb);
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(dbuf_find);
|
|
EXPORT_SYMBOL(dbuf_is_metadata);
|
|
EXPORT_SYMBOL(dbuf_destroy);
|
|
EXPORT_SYMBOL(dbuf_loan_arcbuf);
|
|
EXPORT_SYMBOL(dbuf_whichblock);
|
|
EXPORT_SYMBOL(dbuf_read);
|
|
EXPORT_SYMBOL(dbuf_unoverride);
|
|
EXPORT_SYMBOL(dbuf_free_range);
|
|
EXPORT_SYMBOL(dbuf_new_size);
|
|
EXPORT_SYMBOL(dbuf_release_bp);
|
|
EXPORT_SYMBOL(dbuf_dirty);
|
|
EXPORT_SYMBOL(dmu_buf_set_crypt_params);
|
|
EXPORT_SYMBOL(dmu_buf_will_dirty);
|
|
EXPORT_SYMBOL(dmu_buf_is_dirty);
|
|
EXPORT_SYMBOL(dmu_buf_will_clone);
|
|
EXPORT_SYMBOL(dmu_buf_will_not_fill);
|
|
EXPORT_SYMBOL(dmu_buf_will_fill);
|
|
EXPORT_SYMBOL(dmu_buf_fill_done);
|
|
EXPORT_SYMBOL(dmu_buf_rele);
|
|
EXPORT_SYMBOL(dbuf_assign_arcbuf);
|
|
EXPORT_SYMBOL(dbuf_prefetch);
|
|
EXPORT_SYMBOL(dbuf_hold_impl);
|
|
EXPORT_SYMBOL(dbuf_hold);
|
|
EXPORT_SYMBOL(dbuf_hold_level);
|
|
EXPORT_SYMBOL(dbuf_create_bonus);
|
|
EXPORT_SYMBOL(dbuf_spill_set_blksz);
|
|
EXPORT_SYMBOL(dbuf_rm_spill);
|
|
EXPORT_SYMBOL(dbuf_add_ref);
|
|
EXPORT_SYMBOL(dbuf_rele);
|
|
EXPORT_SYMBOL(dbuf_rele_and_unlock);
|
|
EXPORT_SYMBOL(dbuf_refcount);
|
|
EXPORT_SYMBOL(dbuf_sync_list);
|
|
EXPORT_SYMBOL(dmu_buf_set_user);
|
|
EXPORT_SYMBOL(dmu_buf_set_user_ie);
|
|
EXPORT_SYMBOL(dmu_buf_get_user);
|
|
EXPORT_SYMBOL(dmu_buf_get_blkptr);
|
|
|
|
ZFS_MODULE_PARAM(zfs_dbuf_cache, dbuf_cache_, max_bytes, U64, ZMOD_RW,
|
|
"Maximum size in bytes of the dbuf cache.");
|
|
|
|
ZFS_MODULE_PARAM(zfs_dbuf_cache, dbuf_cache_, hiwater_pct, UINT, ZMOD_RW,
|
|
"Percentage over dbuf_cache_max_bytes for direct dbuf eviction.");
|
|
|
|
ZFS_MODULE_PARAM(zfs_dbuf_cache, dbuf_cache_, lowater_pct, UINT, ZMOD_RW,
|
|
"Percentage below dbuf_cache_max_bytes when dbuf eviction stops.");
|
|
|
|
ZFS_MODULE_PARAM(zfs_dbuf, dbuf_, metadata_cache_max_bytes, U64, ZMOD_RW,
|
|
"Maximum size in bytes of dbuf metadata cache.");
|
|
|
|
ZFS_MODULE_PARAM(zfs_dbuf, dbuf_, cache_shift, UINT, ZMOD_RW,
|
|
"Set size of dbuf cache to log2 fraction of arc size.");
|
|
|
|
ZFS_MODULE_PARAM(zfs_dbuf, dbuf_, metadata_cache_shift, UINT, ZMOD_RW,
|
|
"Set size of dbuf metadata cache to log2 fraction of arc size.");
|
|
|
|
ZFS_MODULE_PARAM(zfs_dbuf, dbuf_, mutex_cache_shift, UINT, ZMOD_RD,
|
|
"Set size of dbuf cache mutex array as log2 shift.");
|