/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2010 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * Copyright (c) 2012, Joyent, Inc. All rights reserved. * Copyright (c) 2013, 2015 by Delphix. All rights reserved. * Copyright (c) 2018 DilOS */ #ifndef _SYS_DMU_IMPL_H #define _SYS_DMU_IMPL_H #include <sys/txg_impl.h> #include <sys/zio.h> #include <sys/dnode.h> #include <sys/zfs_context.h> #include <sys/zfs_ioctl.h> #ifdef __cplusplus extern "C" { #endif /* * This is the locking strategy for the DMU. Numbers in parenthesis are * cases that use that lock order, referenced below: * * ARC is self-contained * bplist is self-contained * refcount is self-contained * txg is self-contained (hopefully!) * zst_lock * zf_rwlock * * XXX try to improve evicting path? * * dp_config_rwlock > os_obj_lock > dn_struct_rwlock > * dn_dbufs_mtx > hash_mutexes > db_mtx > dd_lock > leafs * * dp_config_rwlock * must be held before: everything * protects dd namespace changes * protects property changes globally * held from: * dsl_dir_open/r: * dsl_dir_create_sync/w: * dsl_dir_sync_destroy/w: * dsl_dir_rename_sync/w: * dsl_prop_changed_notify/r: * * os_obj_lock * must be held before: * everything except dp_config_rwlock * protects os_obj_next * held from: * dmu_object_alloc: dn_dbufs_mtx, db_mtx, hash_mutexes, dn_struct_rwlock * * dn_struct_rwlock * must be held before: * everything except dp_config_rwlock and os_obj_lock * protects structure of dnode (eg. nlevels) * db_blkptr can change when syncing out change to nlevels * dn_maxblkid * dn_nlevels * dn_*blksz* * phys nlevels, maxblkid, physical blkptr_t's (?) * held from: * callers of dbuf_read_impl, dbuf_hold[_impl], dbuf_prefetch * dmu_object_info_from_dnode: dn_dirty_mtx (dn_datablksz) * dbuf_read_impl: db_mtx, dmu_zfetch() * dmu_zfetch: zf_rwlock/r, zst_lock, dbuf_prefetch() * dbuf_new_size: db_mtx * dbuf_dirty: db_mtx * dbuf_findbp: (callers, phys? - the real need) * dbuf_create: dn_dbufs_mtx, hash_mutexes, db_mtx (phys?) * dbuf_prefetch: dn_dirty_mtx, hash_mutexes, db_mtx, dn_dbufs_mtx * dbuf_hold_impl: hash_mutexes, db_mtx, dn_dbufs_mtx, dbuf_findbp() * dnode_sync/w (increase_indirection): db_mtx (phys) * dnode_set_blksz/w: dn_dbufs_mtx (dn_*blksz*) * dnode_new_blkid/w: (dn_maxblkid) * dnode_free_range/w: dn_dirty_mtx (dn_maxblkid) * dnode_next_offset: (phys) * * dn_dbufs_mtx * must be held before: * db_mtx, hash_mutexes * protects: * dn_dbufs * dn_evicted * held from: * dmu_evict_user: db_mtx (dn_dbufs) * dbuf_free_range: db_mtx (dn_dbufs) * dbuf_remove_ref: db_mtx, callees: * dbuf_hash_remove: hash_mutexes, db_mtx * dbuf_create: hash_mutexes, db_mtx (dn_dbufs) * dnode_set_blksz: (dn_dbufs) * * hash_mutexes (global) * must be held before: * db_mtx * protects dbuf_hash_table (global) and db_hash_next * held from: * dbuf_find: db_mtx * dbuf_hash_insert: db_mtx * dbuf_hash_remove: db_mtx * * db_mtx (meta-leaf) * must be held before: * dn_mtx, dn_dirty_mtx, dd_lock (leaf mutexes) * protects: * db_state * db_holds * db_buf * db_changed * db_data_pending * db_dirtied * db_link * db_dirty_node (??) * db_dirtycnt * db_d.* * db.* * held from: * dbuf_dirty: dn_mtx, dn_dirty_mtx * dbuf_dirty->dsl_dir_willuse_space: dd_lock * dbuf_dirty->dbuf_new_block->dsl_dataset_block_freeable: dd_lock * dbuf_undirty: dn_dirty_mtx (db_d) * dbuf_write_done: dn_dirty_mtx (db_state) * dbuf_* * dmu_buf_update_user: none (db_d) * dmu_evict_user: none (db_d) (maybe can eliminate) * dbuf_find: none (db_holds) * dbuf_hash_insert: none (db_holds) * dmu_buf_read_array_impl: none (db_state, db_changed) * dmu_sync: none (db_dirty_node, db_d) * dnode_reallocate: none (db) * * dn_mtx (leaf) * protects: * dn_dirty_dbufs * dn_ranges * phys accounting * dn_allocated_txg * dn_free_txg * dn_assigned_txg * dn_dirty_txg * dd_assigned_tx * dn_notxholds * dn_nodnholds * dn_dirtyctx * dn_dirtyctx_firstset * (dn_phys copy fields?) * (dn_phys contents?) * held from: * dnode_* * dbuf_dirty: none * dbuf_sync: none (phys accounting) * dbuf_undirty: none (dn_ranges, dn_dirty_dbufs) * dbuf_write_done: none (phys accounting) * dmu_object_info_from_dnode: none (accounting) * dmu_tx_commit: none * dmu_tx_hold_object_impl: none * dmu_tx_try_assign: dn_notxholds(cv) * dmu_tx_unassign: none * * dd_lock * must be held before: * ds_lock * ancestors' dd_lock * protects: * dd_prop_cbs * dd_sync_* * dd_used_bytes * dd_tempreserved * dd_space_towrite * dd_myname * dd_phys accounting? * held from: * dsl_dir_* * dsl_prop_changed_notify: none (dd_prop_cbs) * dsl_prop_register: none (dd_prop_cbs) * dsl_prop_unregister: none (dd_prop_cbs) * * os_lock (leaf) * protects: * os_dirty_dnodes * os_free_dnodes * os_dnodes * os_downgraded_dbufs * dn_dirtyblksz * dn_dirty_link * held from: * dnode_create: none (os_dnodes) * dnode_destroy: none (os_dnodes) * dnode_setdirty: none (dn_dirtyblksz, os_*_dnodes) * dnode_free: none (dn_dirtyblksz, os_*_dnodes) * * ds_lock * protects: * ds_objset * ds_open_refcount * ds_snapname * ds_phys accounting * ds_phys userrefs zapobj * ds_reserved * held from: * dsl_dataset_* * * dr_mtx (leaf) * protects: * dr_children * held from: * dbuf_dirty * dbuf_undirty * dbuf_sync_indirect * dnode_new_blkid */ struct objset; struct dmu_pool; typedef struct dmu_xuio { int next; int cnt; struct arc_buf **bufs; iovec_t *iovp; } dmu_xuio_t; typedef struct xuio_stats { /* loaned yet not returned arc_buf */ kstat_named_t xuiostat_onloan_rbuf; kstat_named_t xuiostat_onloan_wbuf; /* whether a copy is made when loaning out a read buffer */ kstat_named_t xuiostat_rbuf_copied; kstat_named_t xuiostat_rbuf_nocopy; /* whether a copy is made when assigning a write buffer */ kstat_named_t xuiostat_wbuf_copied; kstat_named_t xuiostat_wbuf_nocopy; } xuio_stats_t; /* * The list of data whose inclusion in a send stream can be pending from * one call to backup_cb to another. Multiple calls to dump_free() and * dump_freeobjects() can be aggregated into a single DRR_FREE or * DRR_FREEOBJECTS replay record. */ typedef enum { PENDING_NONE, PENDING_FREE, PENDING_FREEOBJECTS } dmu_pendop_t; typedef struct dmu_sendarg { list_node_t dsa_link; dmu_replay_record_t *dsa_drr; vnode_t *dsa_vp; int dsa_outfd; struct proc *dsa_proc; offset_t *dsa_off; objset_t *dsa_os; zio_cksum_t dsa_zc; uint64_t dsa_toguid; uint64_t dsa_fromtxg; int dsa_err; dmu_pendop_t dsa_pending_op; uint64_t dsa_featureflags; uint64_t dsa_last_data_object; uint64_t dsa_last_data_offset; uint64_t dsa_resume_object; uint64_t dsa_resume_offset; boolean_t dsa_sent_begin; boolean_t dsa_sent_end; } dmu_sendarg_t; void dmu_object_zapify(objset_t *, uint64_t, dmu_object_type_t, dmu_tx_t *); void dmu_object_free_zapified(objset_t *, uint64_t, dmu_tx_t *); int dmu_buf_hold_noread(objset_t *, uint64_t, uint64_t, void *, dmu_buf_t **); #ifdef __cplusplus } #endif #endif /* _SYS_DMU_IMPL_H */
