1 /* 2 * CDDL HEADER START 3 * 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. 7 * 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. 12 * 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] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 /* 26 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 27 * Copyright (c) 2013, 2015 by Delphix. All rights reserved. 28 * Copyright (c) 2018 DilOS 29 */ 30 31 #ifndef _SYS_DMU_IMPL_H 32 #define _SYS_DMU_IMPL_H 33 34 #include <sys/txg_impl.h> 35 #include <sys/zio.h> 36 #include <sys/dnode.h> 37 #include <sys/zfs_context.h> 38 #include <sys/zfs_ioctl.h> 39 40 #ifdef __cplusplus 41 extern "C" { 42 #endif 43 44 /* 45 * This is the locking strategy for the DMU. Numbers in parenthesis are 46 * cases that use that lock order, referenced below: 47 * 48 * ARC is self-contained 49 * bplist is self-contained 50 * refcount is self-contained 51 * txg is self-contained (hopefully!) 52 * zst_lock 53 * zf_rwlock 54 * 55 * XXX try to improve evicting path? 56 * 57 * dp_config_rwlock > os_obj_lock > dn_struct_rwlock > 58 * dn_dbufs_mtx > hash_mutexes > db_mtx > dd_lock > leafs 59 * 60 * dp_config_rwlock 61 * must be held before: everything 62 * protects dd namespace changes 63 * protects property changes globally 64 * held from: 65 * dsl_dir_open/r: 66 * dsl_dir_create_sync/w: 67 * dsl_dir_sync_destroy/w: 68 * dsl_dir_rename_sync/w: 69 * dsl_prop_changed_notify/r: 70 * 71 * os_obj_lock 72 * must be held before: 73 * everything except dp_config_rwlock 74 * protects os_obj_next 75 * held from: 76 * dmu_object_alloc: dn_dbufs_mtx, db_mtx, hash_mutexes, dn_struct_rwlock 77 * 78 * dn_struct_rwlock 79 * must be held before: 80 * everything except dp_config_rwlock and os_obj_lock 81 * protects structure of dnode (eg. nlevels) 82 * db_blkptr can change when syncing out change to nlevels 83 * dn_maxblkid 84 * dn_nlevels 85 * dn_*blksz* 86 * phys nlevels, maxblkid, physical blkptr_t's (?) 87 * held from: 88 * callers of dbuf_read_impl, dbuf_hold[_impl], dbuf_prefetch 89 * dmu_object_info_from_dnode: dn_dirty_mtx (dn_datablksz) 90 * dbuf_read_impl: db_mtx, dmu_zfetch() 91 * dmu_zfetch: zf_rwlock/r, zst_lock, dbuf_prefetch() 92 * dbuf_new_size: db_mtx 93 * dbuf_dirty: db_mtx 94 * dbuf_findbp: (callers, phys? - the real need) 95 * dbuf_create: dn_dbufs_mtx, hash_mutexes, db_mtx (phys?) 96 * dbuf_prefetch: dn_dirty_mtx, hash_mutexes, db_mtx, dn_dbufs_mtx 97 * dbuf_hold_impl: hash_mutexes, db_mtx, dn_dbufs_mtx, dbuf_findbp() 98 * dnode_sync/w (increase_indirection): db_mtx (phys) 99 * dnode_set_blksz/w: dn_dbufs_mtx (dn_*blksz*) 100 * dnode_new_blkid/w: (dn_maxblkid) 101 * dnode_free_range/w: dn_dirty_mtx (dn_maxblkid) 102 * dnode_next_offset: (phys) 103 * 104 * dn_dbufs_mtx 105 * must be held before: 106 * db_mtx, hash_mutexes 107 * protects: 108 * dn_dbufs 109 * dn_evicted 110 * held from: 111 * dmu_evict_user: db_mtx (dn_dbufs) 112 * dbuf_free_range: db_mtx (dn_dbufs) 113 * dbuf_remove_ref: db_mtx, callees: 114 * dbuf_hash_remove: hash_mutexes, db_mtx 115 * dbuf_create: hash_mutexes, db_mtx (dn_dbufs) 116 * dnode_set_blksz: (dn_dbufs) 117 * 118 * hash_mutexes (global) 119 * must be held before: 120 * db_mtx 121 * protects dbuf_hash_table (global) and db_hash_next 122 * held from: 123 * dbuf_find: db_mtx 124 * dbuf_hash_insert: db_mtx 125 * dbuf_hash_remove: db_mtx 126 * 127 * db_mtx (meta-leaf) 128 * must be held before: 129 * dn_mtx, dn_dirty_mtx, dd_lock (leaf mutexes) 130 * protects: 131 * db_state 132 * db_holds 133 * db_buf 134 * db_changed 135 * db_data_pending 136 * db_dirtied 137 * db_link 138 * db_dirty_node (??) 139 * db_dirtycnt 140 * db_d.* 141 * db.* 142 * held from: 143 * dbuf_dirty: dn_mtx, dn_dirty_mtx 144 * dbuf_dirty->dsl_dir_willuse_space: dd_lock 145 * dbuf_dirty->dbuf_new_block->dsl_dataset_block_freeable: dd_lock 146 * dbuf_undirty: dn_dirty_mtx (db_d) 147 * dbuf_write_done: dn_dirty_mtx (db_state) 148 * dbuf_* 149 * dmu_buf_update_user: none (db_d) 150 * dmu_evict_user: none (db_d) (maybe can eliminate) 151 * dbuf_find: none (db_holds) 152 * dbuf_hash_insert: none (db_holds) 153 * dmu_buf_read_array_impl: none (db_state, db_changed) 154 * dmu_sync: none (db_dirty_node, db_d) 155 * dnode_reallocate: none (db) 156 * 157 * dn_mtx (leaf) 158 * protects: 159 * dn_dirty_dbufs 160 * dn_ranges 161 * phys accounting 162 * dn_allocated_txg 163 * dn_free_txg 164 * dn_assigned_txg 165 * dn_dirty_txg 166 * dd_assigned_tx 167 * dn_notxholds 168 * dn_dirtyctx 169 * dn_dirtyctx_firstset 170 * (dn_phys copy fields?) 171 * (dn_phys contents?) 172 * held from: 173 * dnode_* 174 * dbuf_dirty: none 175 * dbuf_sync: none (phys accounting) 176 * dbuf_undirty: none (dn_ranges, dn_dirty_dbufs) 177 * dbuf_write_done: none (phys accounting) 178 * dmu_object_info_from_dnode: none (accounting) 179 * dmu_tx_commit: none 180 * dmu_tx_hold_object_impl: none 181 * dmu_tx_try_assign: dn_notxholds(cv) 182 * dmu_tx_unassign: none 183 * 184 * dd_lock 185 * must be held before: 186 * ds_lock 187 * ancestors' dd_lock 188 * protects: 189 * dd_prop_cbs 190 * dd_sync_* 191 * dd_used_bytes 192 * dd_tempreserved 193 * dd_space_towrite 194 * dd_myname 195 * dd_phys accounting? 196 * held from: 197 * dsl_dir_* 198 * dsl_prop_changed_notify: none (dd_prop_cbs) 199 * dsl_prop_register: none (dd_prop_cbs) 200 * dsl_prop_unregister: none (dd_prop_cbs) 201 * 202 * os_lock (leaf) 203 * protects: 204 * os_dirty_dnodes 205 * os_free_dnodes 206 * os_dnodes 207 * os_downgraded_dbufs 208 * dn_dirtyblksz 209 * dn_dirty_link 210 * held from: 211 * dnode_create: none (os_dnodes) 212 * dnode_destroy: none (os_dnodes) 213 * dnode_setdirty: none (dn_dirtyblksz, os_*_dnodes) 214 * dnode_free: none (dn_dirtyblksz, os_*_dnodes) 215 * 216 * ds_lock 217 * protects: 218 * ds_objset 219 * ds_open_refcount 220 * ds_snapname 221 * ds_phys accounting 222 * ds_phys userrefs zapobj 223 * ds_reserved 224 * held from: 225 * dsl_dataset_* 226 * 227 * dr_mtx (leaf) 228 * protects: 229 * dr_children 230 * held from: 231 * dbuf_dirty 232 * dbuf_undirty 233 * dbuf_sync_indirect 234 * dnode_new_blkid 235 */ 236 237 struct objset; 238 struct dmu_pool; 239 240 typedef struct dmu_xuio { 241 int next; 242 int cnt; 243 struct arc_buf **bufs; 244 iovec_t *iovp; 245 } dmu_xuio_t; 246 247 typedef struct xuio_stats { 248 /* loaned yet not returned arc_buf */ 249 kstat_named_t xuiostat_onloan_rbuf; 250 kstat_named_t xuiostat_onloan_wbuf; 251 /* whether a copy is made when loaning out a read buffer */ 252 kstat_named_t xuiostat_rbuf_copied; 253 kstat_named_t xuiostat_rbuf_nocopy; 254 /* whether a copy is made when assigning a write buffer */ 255 kstat_named_t xuiostat_wbuf_copied; 256 kstat_named_t xuiostat_wbuf_nocopy; 257 } xuio_stats_t; 258 259 /* 260 * The list of data whose inclusion in a send stream can be pending from 261 * one call to backup_cb to another. Multiple calls to dump_free() and 262 * dump_freeobjects() can be aggregated into a single DRR_FREE or 263 * DRR_FREEOBJECTS replay record. 264 */ 265 typedef enum { 266 PENDING_NONE, 267 PENDING_FREE, 268 PENDING_FREEOBJECTS 269 } dmu_pendop_t; 270 271 typedef struct dmu_sendarg { 272 list_node_t dsa_link; 273 dmu_replay_record_t *dsa_drr; 274 vnode_t *dsa_vp; 275 int dsa_outfd; 276 struct proc *dsa_proc; 277 offset_t *dsa_off; 278 objset_t *dsa_os; 279 zio_cksum_t dsa_zc; 280 uint64_t dsa_toguid; 281 uint64_t dsa_fromtxg; 282 int dsa_err; 283 dmu_pendop_t dsa_pending_op; 284 uint64_t dsa_featureflags; 285 uint64_t dsa_last_data_object; 286 uint64_t dsa_last_data_offset; 287 uint64_t dsa_resume_object; 288 uint64_t dsa_resume_offset; 289 boolean_t dsa_sent_begin; 290 boolean_t dsa_sent_end; 291 } dmu_sendarg_t; 292 293 void dmu_object_zapify(objset_t *, uint64_t, dmu_object_type_t, dmu_tx_t *); 294 void dmu_object_free_zapified(objset_t *, uint64_t, dmu_tx_t *); 295 int dmu_buf_hold_noread(objset_t *, uint64_t, uint64_t, 296 void *, dmu_buf_t **); 297 298 #ifdef __cplusplus 299 } 300 #endif 301 302 #endif /* _SYS_DMU_IMPL_H */ 303