264 lines
7 KiB
C
264 lines
7 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 http://www.opensolaris.org/os/licensing.
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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 2010 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2012, Joyent, Inc. All rights reserved.
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* Copyright (c) 2013, 2018 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_DMU_IMPL_H
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#define _SYS_DMU_IMPL_H
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#include <sys/txg_impl.h>
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#include <sys/zio.h>
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#include <sys/dnode.h>
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#include <sys/zfs_context.h>
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#include <sys/zfs_ioctl.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* This is the locking strategy for the DMU. Numbers in parenthesis are
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* cases that use that lock order, referenced below:
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*
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* ARC is self-contained
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* bplist is self-contained
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* refcount is self-contained
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* txg is self-contained (hopefully!)
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* zst_lock
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* zf_rwlock
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*
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* XXX try to improve evicting path?
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*
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* dp_config_rwlock > os_obj_lock > dn_struct_rwlock >
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* dn_dbufs_mtx > hash_mutexes > db_mtx > dd_lock > leafs
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*
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* dp_config_rwlock
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* must be held before: everything
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* protects dd namespace changes
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* protects property changes globally
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* held from:
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* dsl_dir_open/r:
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* dsl_dir_create_sync/w:
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* dsl_dir_sync_destroy/w:
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* dsl_dir_rename_sync/w:
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* dsl_prop_changed_notify/r:
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*
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* os_obj_lock
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* must be held before:
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* everything except dp_config_rwlock
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* protects os_obj_next
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* held from:
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* dmu_object_alloc: dn_dbufs_mtx, db_mtx, hash_mutexes, dn_struct_rwlock
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*
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* dn_struct_rwlock
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* must be held before:
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* everything except dp_config_rwlock and os_obj_lock
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* protects structure of dnode (eg. nlevels)
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* db_blkptr can change when syncing out change to nlevels
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* dn_maxblkid
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* dn_nlevels
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* dn_*blksz*
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* phys nlevels, maxblkid, physical blkptr_t's (?)
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* held from:
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* callers of dbuf_read_impl, dbuf_hold[_impl], dbuf_prefetch
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* dmu_object_info_from_dnode: dn_dirty_mtx (dn_datablksz)
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* dbuf_read_impl: db_mtx, dmu_zfetch()
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* dmu_zfetch: zf_rwlock/r, zst_lock, dbuf_prefetch()
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* dbuf_new_size: db_mtx
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* dbuf_dirty: db_mtx
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* dbuf_findbp: (callers, phys? - the real need)
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* dbuf_create: dn_dbufs_mtx, hash_mutexes, db_mtx (phys?)
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* dbuf_prefetch: dn_dirty_mtx, hash_mutexes, db_mtx, dn_dbufs_mtx
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* dbuf_hold_impl: hash_mutexes, db_mtx, dn_dbufs_mtx, dbuf_findbp()
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* dnode_sync/w (increase_indirection): db_mtx (phys)
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* dnode_set_blksz/w: dn_dbufs_mtx (dn_*blksz*)
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* dnode_new_blkid/w: (dn_maxblkid)
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* dnode_free_range/w: dn_dirty_mtx (dn_maxblkid)
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* dnode_next_offset: (phys)
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*
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* dn_dbufs_mtx
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* must be held before:
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* db_mtx, hash_mutexes
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* protects:
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* dn_dbufs
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* dn_evicted
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* held from:
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* dmu_evict_user: db_mtx (dn_dbufs)
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* dbuf_free_range: db_mtx (dn_dbufs)
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* dbuf_remove_ref: db_mtx, callees:
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* dbuf_hash_remove: hash_mutexes, db_mtx
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* dbuf_create: hash_mutexes, db_mtx (dn_dbufs)
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* dnode_set_blksz: (dn_dbufs)
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*
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* hash_mutexes (global)
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* must be held before:
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* db_mtx
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* protects dbuf_hash_table (global) and db_hash_next
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* held from:
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* dbuf_find: db_mtx
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* dbuf_hash_insert: db_mtx
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* dbuf_hash_remove: db_mtx
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*
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* db_mtx (meta-leaf)
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* must be held before:
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* dn_mtx, dn_dirty_mtx, dd_lock (leaf mutexes)
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* protects:
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* db_state
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* db_holds
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* db_buf
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* db_changed
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* db_data_pending
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* db_dirtied
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* db_link
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* db_dirty_node (??)
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* db_dirtycnt
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* db_d.*
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* db.*
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* held from:
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* dbuf_dirty: dn_mtx, dn_dirty_mtx
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* dbuf_dirty->dsl_dir_willuse_space: dd_lock
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* dbuf_dirty->dbuf_new_block->dsl_dataset_block_freeable: dd_lock
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* dbuf_undirty: dn_dirty_mtx (db_d)
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* dbuf_write_done: dn_dirty_mtx (db_state)
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* dbuf_*
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* dmu_buf_update_user: none (db_d)
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* dmu_evict_user: none (db_d) (maybe can eliminate)
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* dbuf_find: none (db_holds)
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* dbuf_hash_insert: none (db_holds)
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* dmu_buf_read_array_impl: none (db_state, db_changed)
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* dmu_sync: none (db_dirty_node, db_d)
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* dnode_reallocate: none (db)
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*
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* dn_mtx (leaf)
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* protects:
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* dn_dirty_dbufs
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* dn_ranges
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* phys accounting
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* dn_allocated_txg
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* dn_free_txg
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* dn_assigned_txg
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* dn_dirty_txg
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* dd_assigned_tx
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* dn_notxholds
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* dn_nodnholds
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* dn_dirtyctx
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* dn_dirtyctx_firstset
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* (dn_phys copy fields?)
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* (dn_phys contents?)
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* held from:
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* dnode_*
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* dbuf_dirty: none
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* dbuf_sync: none (phys accounting)
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* dbuf_undirty: none (dn_ranges, dn_dirty_dbufs)
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* dbuf_write_done: none (phys accounting)
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* dmu_object_info_from_dnode: none (accounting)
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* dmu_tx_commit: none
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* dmu_tx_hold_object_impl: none
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* dmu_tx_try_assign: dn_notxholds(cv)
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* dmu_tx_unassign: none
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*
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* dd_lock
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* must be held before:
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* ds_lock
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* ancestors' dd_lock
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* protects:
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* dd_prop_cbs
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* dd_sync_*
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* dd_used_bytes
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* dd_tempreserved
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* dd_space_towrite
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* dd_myname
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* dd_phys accounting?
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* held from:
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* dsl_dir_*
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* dsl_prop_changed_notify: none (dd_prop_cbs)
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* dsl_prop_register: none (dd_prop_cbs)
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* dsl_prop_unregister: none (dd_prop_cbs)
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*
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* os_lock (leaf)
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* protects:
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* os_dirty_dnodes
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* os_free_dnodes
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* os_dnodes
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* os_downgraded_dbufs
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* dn_dirtyblksz
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* dn_dirty_link
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* held from:
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* dnode_create: none (os_dnodes)
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* dnode_destroy: none (os_dnodes)
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* dnode_setdirty: none (dn_dirtyblksz, os_*_dnodes)
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* dnode_free: none (dn_dirtyblksz, os_*_dnodes)
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*
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* ds_lock
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* protects:
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* ds_objset
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* ds_open_refcount
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* ds_snapname
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* ds_phys accounting
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* ds_phys userrefs zapobj
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* ds_reserved
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* held from:
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* dsl_dataset_*
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*
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* dr_mtx (leaf)
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* protects:
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* dr_children
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* held from:
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* dbuf_dirty
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* dbuf_undirty
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* dbuf_sync_indirect
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* dnode_new_blkid
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*/
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struct objset;
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struct dmu_pool;
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typedef struct dmu_xuio {
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int next;
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int cnt;
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struct arc_buf **bufs;
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iovec_t *iovp;
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} dmu_xuio_t;
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typedef struct dmu_sendstatus {
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list_node_t dss_link;
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int dss_outfd;
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proc_t *dss_proc;
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offset_t *dss_off;
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uint64_t dss_blocks; /* blocks visited during the sending process */
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} dmu_sendstatus_t;
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void dmu_object_zapify(objset_t *, uint64_t, dmu_object_type_t, dmu_tx_t *);
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void dmu_object_free_zapified(objset_t *, uint64_t, dmu_tx_t *);
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int dmu_buf_hold_noread(objset_t *, uint64_t, uint64_t,
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void *, dmu_buf_t **);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_DMU_IMPL_H */
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