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 https://opensource.org/licenses/CDDL-1.0. 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, 2018 by Delphix. All rights reserved. 28 */ 29 30 #ifndef _SYS_DMU_IMPL_H 31 #define _SYS_DMU_IMPL_H 32 33 #include <sys/txg_impl.h> 34 #include <sys/zio.h> 35 #include <sys/dnode.h> 36 #include <sys/zfs_context.h> 37 #include <sys/zfs_ioctl.h> 38 #include <sys/uio.h> 39 #include <sys/abd.h> 40 #include <sys/arc.h> 41 #include <sys/dbuf.h> 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 /* 48 * This is the locking strategy for the DMU. Numbers in parenthesis are 49 * cases that use that lock order, referenced below: 50 * 51 * ARC is self-contained 52 * bplist is self-contained 53 * refcount is self-contained 54 * txg is self-contained (hopefully!) 55 * zst_lock 56 * zf_rwlock 57 * 58 * XXX try to improve evicting path? 59 * 60 * dp_config_rwlock > os_obj_lock > dn_struct_rwlock > 61 * dn_dbufs_mtx > hash_mutexes > db_mtx > dd_lock > leafs 62 * 63 * dp_config_rwlock 64 * must be held before: everything 65 * protects dd namespace changes 66 * protects property changes globally 67 * held from: 68 * dsl_dir_open/r: 69 * dsl_dir_create_sync/w: 70 * dsl_dir_sync_destroy/w: 71 * dsl_dir_rename_sync/w: 72 * dsl_prop_changed_notify/r: 73 * 74 * os_obj_lock 75 * must be held before: 76 * everything except dp_config_rwlock 77 * protects os_obj_next 78 * held from: 79 * dmu_object_alloc: dn_dbufs_mtx, db_mtx, hash_mutexes, dn_struct_rwlock 80 * 81 * dn_struct_rwlock 82 * must be held before: 83 * everything except dp_config_rwlock and os_obj_lock 84 * protects structure of dnode (eg. nlevels) 85 * db_blkptr can change when syncing out change to nlevels 86 * dn_maxblkid 87 * dn_nlevels 88 * dn_*blksz* 89 * phys nlevels, maxblkid, physical blkptr_t's (?) 90 * held from: 91 * callers of dbuf_read_impl, dbuf_hold[_impl], dbuf_prefetch 92 * dmu_object_info_from_dnode: dn_dirty_mtx (dn_datablksz) 93 * dbuf_read_impl: db_mtx, dmu_zfetch() 94 * dmu_zfetch: zf_rwlock/r, zst_lock, dbuf_prefetch() 95 * dbuf_new_size: db_mtx 96 * dbuf_dirty: db_mtx 97 * dbuf_findbp: (callers, phys? - the real need) 98 * dbuf_create: dn_dbufs_mtx, hash_mutexes, db_mtx (phys?) 99 * dbuf_prefetch: dn_dirty_mtx, hash_mutexes, db_mtx, dn_dbufs_mtx 100 * dbuf_hold_impl: hash_mutexes, db_mtx, dn_dbufs_mtx, dbuf_findbp() 101 * dnode_sync/w (increase_indirection): db_mtx (phys) 102 * dnode_set_blksz/w: dn_dbufs_mtx (dn_*blksz*) 103 * dnode_new_blkid/w: (dn_maxblkid) 104 * dnode_free_range/w: dn_dirty_mtx (dn_maxblkid) 105 * dnode_next_offset: (phys) 106 * 107 * dn_dbufs_mtx 108 * must be held before: 109 * db_mtx, hash_mutexes 110 * protects: 111 * dn_dbufs 112 * dn_evicted 113 * held from: 114 * dmu_evict_user: db_mtx (dn_dbufs) 115 * dbuf_free_range: db_mtx (dn_dbufs) 116 * dbuf_remove_ref: db_mtx, callees: 117 * dbuf_hash_remove: hash_mutexes, db_mtx 118 * dbuf_create: hash_mutexes, db_mtx (dn_dbufs) 119 * dnode_set_blksz: (dn_dbufs) 120 * 121 * hash_mutexes (global) 122 * must be held before: 123 * db_mtx 124 * protects dbuf_hash_table (global) and db_hash_next 125 * held from: 126 * dbuf_find: db_mtx 127 * dbuf_hash_insert: db_mtx 128 * dbuf_hash_remove: db_mtx 129 * 130 * db_mtx (meta-leaf) 131 * must be held before: 132 * dn_mtx, dn_dirty_mtx, dd_lock (leaf mutexes) 133 * protects: 134 * db_state 135 * db_holds 136 * db_buf 137 * db_changed 138 * db_data_pending 139 * db_dirtied 140 * db_link 141 * db_dirty_records 142 * db_dirtycnt 143 * db_d.* 144 * db.* 145 * held from: 146 * dbuf_dirty: dn_mtx, dn_dirty_mtx 147 * dbuf_dirty->dsl_dir_willuse_space: dd_lock 148 * dbuf_dirty->dbuf_new_block->dsl_dataset_block_freeable: dd_lock 149 * dbuf_undirty: dn_dirty_mtx (db_d) 150 * dbuf_write_done: dn_dirty_mtx (db_state) 151 * dbuf_* 152 * dmu_buf_update_user: none (db_d) 153 * dmu_evict_user: none (db_d) (maybe can eliminate) 154 * dbuf_find: none (db_holds) 155 * dbuf_hash_insert: none (db_holds) 156 * dmu_buf_read_array_impl: none (db_state, db_changed) 157 * dmu_sync: none (db_dirty_records, db_d) 158 * dnode_reallocate: none (db) 159 * dmu_write_direct: none (db_dirty_records, db_d) 160 * dmu_write_direct_done: none (db_dirty_records, db_d) 161 * 162 * dn_mtx (leaf) 163 * protects: 164 * dn_dirty_dbufs 165 * dn_ranges 166 * phys accounting 167 * dn_allocated_txg 168 * dn_free_txg 169 * dn_assigned_txg 170 * dn_dirty_txg 171 * dd_assigned_tx 172 * dn_notxholds 173 * dn_nodnholds 174 * dn_dirtyctx 175 * dn_dirtyctx_firstset 176 * (dn_phys copy fields?) 177 * (dn_phys contents?) 178 * held from: 179 * dnode_* 180 * dbuf_dirty: none 181 * dbuf_sync: none (phys accounting) 182 * dbuf_undirty: none (dn_ranges, dn_dirty_dbufs) 183 * dbuf_write_done: none (phys accounting) 184 * dmu_object_info_from_dnode: none (accounting) 185 * dmu_tx_commit: none 186 * dmu_tx_hold_object_impl: none 187 * dmu_tx_try_assign: dn_notxholds(cv) 188 * dmu_tx_unassign: none 189 * 190 * dd_lock 191 * must be held before: 192 * ds_lock 193 * ancestors' dd_lock 194 * protects: 195 * dd_prop_cbs 196 * dd_sync_* 197 * dd_used_bytes 198 * dd_tempreserved 199 * dd_space_towrite 200 * dd_myname 201 * dd_phys accounting? 202 * held from: 203 * dsl_dir_* 204 * dsl_prop_changed_notify: none (dd_prop_cbs) 205 * dsl_prop_register: none (dd_prop_cbs) 206 * dsl_prop_unregister: none (dd_prop_cbs) 207 * 208 * os_lock (leaf) 209 * protects: 210 * os_dirty_dnodes 211 * os_free_dnodes 212 * os_dnodes 213 * os_downgraded_dbufs 214 * dn_dirtyblksz 215 * dn_dirty_link 216 * held from: 217 * dnode_create: none (os_dnodes) 218 * dnode_destroy: none (os_dnodes) 219 * dnode_setdirty: none (dn_dirtyblksz, os_*_dnodes) 220 * dnode_free: none (dn_dirtyblksz, os_*_dnodes) 221 * 222 * ds_lock 223 * protects: 224 * ds_objset 225 * ds_open_refcount 226 * ds_snapname 227 * ds_phys accounting 228 * ds_phys userrefs zapobj 229 * ds_reserved 230 * held from: 231 * dsl_dataset_* 232 * 233 * dr_mtx (leaf) 234 * protects: 235 * dr_children 236 * held from: 237 * dbuf_dirty 238 * dbuf_undirty 239 * dbuf_sync_indirect 240 * dnode_new_blkid 241 */ 242 243 struct dmu_pool; 244 struct dmu_buf; 245 struct zgd; 246 247 typedef struct dmu_sendstatus { 248 list_node_t dss_link; 249 int dss_outfd; 250 proc_t *dss_proc; 251 offset_t *dss_off; 252 uint64_t dss_blocks; /* blocks visited during the sending process */ 253 } dmu_sendstatus_t; 254 255 /* 256 * dmu_sync_{ready/done} args 257 */ 258 typedef struct { 259 dbuf_dirty_record_t *dsa_dr; 260 void (*dsa_done)(struct zgd *, int); 261 struct zgd *dsa_zgd; 262 dmu_tx_t *dsa_tx; 263 } dmu_sync_arg_t; 264 265 void dmu_sync_done(zio_t *, arc_buf_t *buf, void *varg); 266 void dmu_sync_ready(zio_t *, arc_buf_t *buf, void *varg); 267 268 void dmu_object_zapify(objset_t *, uint64_t, dmu_object_type_t, dmu_tx_t *); 269 void dmu_object_free_zapified(objset_t *, uint64_t, dmu_tx_t *); 270 271 int dmu_write_direct(zio_t *, dmu_buf_impl_t *, abd_t *, dmu_tx_t *); 272 int dmu_read_abd(dnode_t *, uint64_t, uint64_t, abd_t *, uint32_t flags); 273 int dmu_write_abd(dnode_t *, uint64_t, uint64_t, abd_t *, uint32_t, dmu_tx_t *); 274 #if defined(_KERNEL) 275 int dmu_read_uio_direct(dnode_t *, zfs_uio_t *, uint64_t); 276 int dmu_write_uio_direct(dnode_t *, zfs_uio_t *, uint64_t, dmu_tx_t *); 277 #endif 278 279 #ifdef __cplusplus 280 } 281 #endif 282 283 #endif /* _SYS_DMU_IMPL_H */ 284