4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
27 * Copyright (c) 2012, Martin Matuska <mm@FreeBSD.org>. All rights reserved.
28 * Copyright (c) 2013 by Delphix. All rights reserved.
31 #ifndef _SYS_DMU_IMPL_H
32 #define _SYS_DMU_IMPL_H
34 #include <sys/txg_impl.h>
36 #include <sys/dnode.h>
37 #include <sys/kstat.h>
38 #include <sys/zfs_context.h>
39 #include <sys/zfs_ioctl.h>
46 * This is the locking strategy for the DMU. Numbers in parenthesis are
47 * cases that use that lock order, referenced below:
49 * ARC is self-contained
50 * bplist is self-contained
51 * refcount is self-contained
52 * txg is self-contained (hopefully!)
56 * XXX try to improve evicting path?
58 * dp_config_rwlock > os_obj_lock > dn_struct_rwlock >
59 * dn_dbufs_mtx > hash_mutexes > db_mtx > dd_lock > leafs
62 * must be held before: everything
63 * protects dd namespace changes
64 * protects property changes globally
67 * dsl_dir_create_sync/w:
68 * dsl_dir_sync_destroy/w:
69 * dsl_dir_rename_sync/w:
70 * dsl_prop_changed_notify/r:
73 * must be held before:
74 * everything except dp_config_rwlock
75 * protects os_obj_next
77 * dmu_object_alloc: dn_dbufs_mtx, db_mtx, hash_mutexes, dn_struct_rwlock
80 * must be held before:
81 * everything except dp_config_rwlock and os_obj_lock
82 * protects structure of dnode (eg. nlevels)
83 * db_blkptr can change when syncing out change to nlevels
87 * phys nlevels, maxblkid, physical blkptr_t's (?)
89 * callers of dbuf_read_impl, dbuf_hold[_impl], dbuf_prefetch
90 * dmu_object_info_from_dnode: dn_dirty_mtx (dn_datablksz)
92 * dbuf_read_impl: db_mtx, dmu_zfetch()
93 * dmu_zfetch: zf_rwlock/r, zst_lock, dbuf_prefetch()
94 * dbuf_new_size: db_mtx
96 * dbuf_findbp: (callers, phys? - the real need)
97 * dbuf_create: dn_dbufs_mtx, hash_mutexes, db_mtx (phys?)
98 * dbuf_prefetch: dn_dirty_mtx, hash_mutexes, db_mtx, dn_dbufs_mtx
99 * dbuf_hold_impl: hash_mutexes, db_mtx, dn_dbufs_mtx, dbuf_findbp()
100 * dnode_sync/w (increase_indirection): db_mtx (phys)
101 * dnode_set_blksz/w: dn_dbufs_mtx (dn_*blksz*)
102 * dnode_new_blkid/w: (dn_maxblkid)
103 * dnode_free_range/w: dn_dirty_mtx (dn_maxblkid)
104 * dnode_next_offset: (phys)
107 * must be held before:
108 * db_mtx, hash_mutexes
113 * dmu_evict_user: db_mtx (dn_dbufs)
114 * dbuf_free_range: db_mtx (dn_dbufs)
115 * dbuf_remove_ref: db_mtx, callees:
116 * dbuf_hash_remove: hash_mutexes, db_mtx
117 * dbuf_create: hash_mutexes, db_mtx (dn_dbufs)
118 * dnode_set_blksz: (dn_dbufs)
120 * hash_mutexes (global)
121 * must be held before:
123 * protects dbuf_hash_table (global) and db_hash_next
126 * dbuf_hash_insert: db_mtx
127 * dbuf_hash_remove: db_mtx
130 * must be held before:
131 * dn_mtx, dn_dirty_mtx, dd_lock (leaf mutexes)
145 * dbuf_dirty: dn_mtx, dn_dirty_mtx
146 * dbuf_dirty->dsl_dir_willuse_space: dd_lock
147 * dbuf_dirty->dbuf_new_block->dsl_dataset_block_freeable: dd_lock
148 * dbuf_undirty: dn_dirty_mtx (db_d)
149 * dbuf_write_done: dn_dirty_mtx (db_state)
151 * dmu_buf_update_user: none (db_d)
152 * dmu_evict_user: none (db_d) (maybe can eliminate)
153 * dbuf_find: none (db_holds)
154 * dbuf_hash_insert: none (db_holds)
155 * dmu_buf_read_array_impl: none (db_state, db_changed)
156 * dmu_sync: none (db_dirty_node, db_d)
157 * dnode_reallocate: none (db)
170 * dn_dirtyctx_firstset
171 * (dn_phys copy fields?)
172 * (dn_phys contents?)
176 * dbuf_sync: none (phys accounting)
177 * dbuf_undirty: none (dn_ranges, dn_dirty_dbufs)
178 * dbuf_write_done: none (phys accounting)
179 * dmu_object_info_from_dnode: none (accounting)
180 * dmu_tx_commit: none
181 * dmu_tx_hold_object_impl: none
182 * dmu_tx_try_assign: dn_notxholds(cv)
183 * dmu_tx_unassign: none
186 * must be held before:
196 * dd_phys accounting?
199 * dsl_prop_changed_notify: none (dd_prop_cbs)
200 * dsl_prop_register: none (dd_prop_cbs)
201 * dsl_prop_unregister: none (dd_prop_cbs)
202 * dsl_dataset_block_freeable: none (dd_sync_*)
209 * os_downgraded_dbufs
213 * dnode_create: none (os_dnodes)
214 * dnode_destroy: none (os_dnodes)
215 * dnode_setdirty: none (dn_dirtyblksz, os_*_dnodes)
216 * dnode_free: none (dn_dirtyblksz, os_*_dnodes)
224 * ds_phys userrefs zapobj
242 typedef struct dmu_xuio {
245 struct arc_buf **bufs;
249 typedef struct xuio_stats {
250 /* loaned yet not returned arc_buf */
251 kstat_named_t xuiostat_onloan_rbuf;
252 kstat_named_t xuiostat_onloan_wbuf;
253 /* whether a copy is made when loaning out a read buffer */
254 kstat_named_t xuiostat_rbuf_copied;
255 kstat_named_t xuiostat_rbuf_nocopy;
256 /* whether a copy is made when assigning a write buffer */
257 kstat_named_t xuiostat_wbuf_copied;
258 kstat_named_t xuiostat_wbuf_nocopy;
261 static xuio_stats_t xuio_stats = {
262 { "onloan_read_buf", KSTAT_DATA_UINT64 },
263 { "onloan_write_buf", KSTAT_DATA_UINT64 },
264 { "read_buf_copied", KSTAT_DATA_UINT64 },
265 { "read_buf_nocopy", KSTAT_DATA_UINT64 },
266 { "write_buf_copied", KSTAT_DATA_UINT64 },
267 { "write_buf_nocopy", KSTAT_DATA_UINT64 }
270 #define XUIOSTAT_INCR(stat, val) \
271 atomic_add_64(&xuio_stats.stat.value.ui64, (val))
272 #define XUIOSTAT_BUMP(stat) XUIOSTAT_INCR(stat, 1)
275 * The list of data whose inclusion in a send stream can be pending from
276 * one call to backup_cb to another. Multiple calls to dump_free() and
277 * dump_freeobjects() can be aggregated into a single DRR_FREE or
278 * DRR_FREEOBJECTS replay record.
286 typedef struct dmu_sendarg {
287 list_node_t dsa_link;
288 dmu_replay_record_t *dsa_drr;
292 struct proc *dsa_proc;
298 dmu_pendop_t dsa_pending_op;
299 boolean_t dsa_incremental;
300 uint64_t dsa_featureflags;
301 uint64_t dsa_last_data_object;
302 uint64_t dsa_last_data_offset;
305 void dmu_object_zapify(objset_t *, uint64_t, dmu_object_type_t, dmu_tx_t *);
306 void dmu_object_free_zapified(objset_t *, uint64_t, dmu_tx_t *);
307 int dmu_buf_hold_noread(objset_t *, uint64_t, uint64_t,
308 void *, dmu_buf_t **);
314 #endif /* _SYS_DMU_IMPL_H */