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 */ 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 39 #ifdef __cplusplus 40 extern "C" { 41 #endif 42 43 /* 44 * This is the locking strategy for the DMU. Numbers in parenthesis are 45 * cases that use that lock order, referenced below: 46 * 47 * ARC is self-contained 48 * bplist is self-contained 49 * refcount is self-contained 50 * txg is self-contained (hopefully!) 51 * zst_lock 52 * zf_rwlock 53 * 54 * XXX try to improve evicting path? 55 * 56 * dp_config_rwlock > os_obj_lock > dn_struct_rwlock > 57 * dn_dbufs_mtx > hash_mutexes > db_mtx > dd_lock > leafs 58 * 59 * dp_config_rwlock 60 * must be held before: everything 61 * protects dd namespace changes 62 * protects property changes globally 63 * held from: 64 * dsl_dir_open/r: 65 * dsl_dir_create_sync/w: 66 * dsl_dir_sync_destroy/w: 67 * dsl_dir_rename_sync/w: 68 * dsl_prop_changed_notify/r: 69 * 70 * os_obj_lock 71 * must be held before: 72 * everything except dp_config_rwlock 73 * protects os_obj_next 74 * held from: 75 * dmu_object_alloc: dn_dbufs_mtx, db_mtx, hash_mutexes, dn_struct_rwlock 76 * 77 * dn_struct_rwlock 78 * must be held before: 79 * everything except dp_config_rwlock and os_obj_lock 80 * protects structure of dnode (eg. nlevels) 81 * db_blkptr can change when syncing out change to nlevels 82 * dn_maxblkid 83 * dn_nlevels 84 * dn_*blksz* 85 * phys nlevels, maxblkid, physical blkptr_t's (?) 86 * held from: 87 * callers of dbuf_read_impl, dbuf_hold[_impl], dbuf_prefetch 88 * dmu_object_info_from_dnode: dn_dirty_mtx (dn_datablksz) 89 * dbuf_read_impl: db_mtx, dmu_zfetch() 90 * dmu_zfetch: zf_rwlock/r, zst_lock, dbuf_prefetch() 91 * dbuf_new_size: db_mtx 92 * dbuf_dirty: db_mtx 93 * dbuf_findbp: (callers, phys? - the real need) 94 * dbuf_create: dn_dbufs_mtx, hash_mutexes, db_mtx (phys?) 95 * dbuf_prefetch: dn_dirty_mtx, hash_mutexes, db_mtx, dn_dbufs_mtx 96 * dbuf_hold_impl: hash_mutexes, db_mtx, dn_dbufs_mtx, dbuf_findbp() 97 * dnode_sync/w (increase_indirection): db_mtx (phys) 98 * dnode_set_blksz/w: dn_dbufs_mtx (dn_*blksz*) 99 * dnode_new_blkid/w: (dn_maxblkid) 100 * dnode_free_range/w: dn_dirty_mtx (dn_maxblkid) 101 * dnode_next_offset: (phys) 102 * 103 * dn_dbufs_mtx 104 * must be held before: 105 * db_mtx, hash_mutexes 106 * protects: 107 * dn_dbufs 108 * dn_evicted 109 * held from: 110 * dmu_evict_user: db_mtx (dn_dbufs) 111 * dbuf_free_range: db_mtx (dn_dbufs) 112 * dbuf_remove_ref: db_mtx, callees: 113 * dbuf_hash_remove: hash_mutexes, db_mtx 114 * dbuf_create: hash_mutexes, db_mtx (dn_dbufs) 115 * dnode_set_blksz: (dn_dbufs) 116 * 117 * hash_mutexes (global) 118 * must be held before: 119 * db_mtx 120 * protects dbuf_hash_table (global) and db_hash_next 121 * held from: 122 * dbuf_find: db_mtx 123 * dbuf_hash_insert: db_mtx 124 * dbuf_hash_remove: db_mtx 125 * 126 * db_mtx (meta-leaf) 127 * must be held before: 128 * dn_mtx, dn_dirty_mtx, dd_lock (leaf mutexes) 129 * protects: 130 * db_state 131 * db_holds 132 * db_buf 133 * db_changed 134 * db_data_pending 135 * db_dirtied 136 * db_link 137 * db_dirty_node (??) 138 * db_dirtycnt 139 * db_d.* 140 * db.* 141 * held from: 142 * dbuf_dirty: dn_mtx, dn_dirty_mtx 143 * dbuf_dirty->dsl_dir_willuse_space: dd_lock 144 * dbuf_dirty->dbuf_new_block->dsl_dataset_block_freeable: dd_lock 145 * dbuf_undirty: dn_dirty_mtx (db_d) 146 * dbuf_write_done: dn_dirty_mtx (db_state) 147 * dbuf_* 148 * dmu_buf_update_user: none (db_d) 149 * dmu_evict_user: none (db_d) (maybe can eliminate) 150 * dbuf_find: none (db_holds) 151 * dbuf_hash_insert: none (db_holds) 152 * dmu_buf_read_array_impl: none (db_state, db_changed) 153 * dmu_sync: none (db_dirty_node, db_d) 154 * dnode_reallocate: none (db) 155 * 156 * dn_mtx (leaf) 157 * protects: 158 * dn_dirty_dbufs 159 * dn_ranges 160 * phys accounting 161 * dn_allocated_txg 162 * dn_free_txg 163 * dn_assigned_txg 164 * dd_assigned_tx 165 * dn_notxholds 166 * dn_dirtyctx 167 * dn_dirtyctx_firstset 168 * (dn_phys copy fields?) 169 * (dn_phys contents?) 170 * held from: 171 * dnode_* 172 * dbuf_dirty: none 173 * dbuf_sync: none (phys accounting) 174 * dbuf_undirty: none (dn_ranges, dn_dirty_dbufs) 175 * dbuf_write_done: none (phys accounting) 176 * dmu_object_info_from_dnode: none (accounting) 177 * dmu_tx_commit: none 178 * dmu_tx_hold_object_impl: none 179 * dmu_tx_try_assign: dn_notxholds(cv) 180 * dmu_tx_unassign: none 181 * 182 * dd_lock 183 * must be held before: 184 * ds_lock 185 * ancestors' dd_lock 186 * protects: 187 * dd_prop_cbs 188 * dd_sync_* 189 * dd_used_bytes 190 * dd_tempreserved 191 * dd_space_towrite 192 * dd_myname 193 * dd_phys accounting? 194 * held from: 195 * dsl_dir_* 196 * dsl_prop_changed_notify: none (dd_prop_cbs) 197 * dsl_prop_register: none (dd_prop_cbs) 198 * dsl_prop_unregister: none (dd_prop_cbs) 199 * 200 * os_lock (leaf) 201 * protects: 202 * os_dirty_dnodes 203 * os_free_dnodes 204 * os_dnodes 205 * os_downgraded_dbufs 206 * dn_dirtyblksz 207 * dn_dirty_link 208 * held from: 209 * dnode_create: none (os_dnodes) 210 * dnode_destroy: none (os_dnodes) 211 * dnode_setdirty: none (dn_dirtyblksz, os_*_dnodes) 212 * dnode_free: none (dn_dirtyblksz, os_*_dnodes) 213 * 214 * ds_lock 215 * protects: 216 * ds_objset 217 * ds_open_refcount 218 * ds_snapname 219 * ds_phys accounting 220 * ds_phys userrefs zapobj 221 * ds_reserved 222 * held from: 223 * dsl_dataset_* 224 * 225 * dr_mtx (leaf) 226 * protects: 227 * dr_children 228 * held from: 229 * dbuf_dirty 230 * dbuf_undirty 231 * dbuf_sync_indirect 232 * dnode_new_blkid 233 */ 234 235 struct objset; 236 struct dmu_pool; 237 238 typedef struct dmu_xuio { 239 int next; 240 int cnt; 241 struct arc_buf **bufs; 242 iovec_t *iovp; 243 } dmu_xuio_t; 244 245 typedef struct xuio_stats { 246 /* loaned yet not returned arc_buf */ 247 kstat_named_t xuiostat_onloan_rbuf; 248 kstat_named_t xuiostat_onloan_wbuf; 249 /* whether a copy is made when loaning out a read buffer */ 250 kstat_named_t xuiostat_rbuf_copied; 251 kstat_named_t xuiostat_rbuf_nocopy; 252 /* whether a copy is made when assigning a write buffer */ 253 kstat_named_t xuiostat_wbuf_copied; 254 kstat_named_t xuiostat_wbuf_nocopy; 255 } xuio_stats_t; 256 257 static xuio_stats_t xuio_stats = { 258 { "onloan_read_buf", KSTAT_DATA_UINT64 }, 259 { "onloan_write_buf", KSTAT_DATA_UINT64 }, 260 { "read_buf_copied", KSTAT_DATA_UINT64 }, 261 { "read_buf_nocopy", KSTAT_DATA_UINT64 }, 262 { "write_buf_copied", KSTAT_DATA_UINT64 }, 263 { "write_buf_nocopy", KSTAT_DATA_UINT64 } 264 }; 265 266 #define XUIOSTAT_INCR(stat, val) \ 267 atomic_add_64(&xuio_stats.stat.value.ui64, (val)) 268 #define XUIOSTAT_BUMP(stat) XUIOSTAT_INCR(stat, 1) 269 270 /* 271 * The list of data whose inclusion in a send stream can be pending from 272 * one call to backup_cb to another. Multiple calls to dump_free() and 273 * dump_freeobjects() can be aggregated into a single DRR_FREE or 274 * DRR_FREEOBJECTS replay record. 275 */ 276 typedef enum { 277 PENDING_NONE, 278 PENDING_FREE, 279 PENDING_FREEOBJECTS 280 } dmu_pendop_t; 281 282 typedef struct dmu_sendarg { 283 list_node_t dsa_link; 284 dmu_replay_record_t *dsa_drr; 285 vnode_t *dsa_vp; 286 int dsa_outfd; 287 struct proc *dsa_proc; 288 offset_t *dsa_off; 289 objset_t *dsa_os; 290 zio_cksum_t dsa_zc; 291 uint64_t dsa_toguid; 292 int dsa_err; 293 dmu_pendop_t dsa_pending_op; 294 uint64_t dsa_featureflags; 295 uint64_t dsa_last_data_object; 296 uint64_t dsa_last_data_offset; 297 uint64_t dsa_resume_object; 298 uint64_t dsa_resume_offset; 299 boolean_t dsa_sent_begin; 300 boolean_t dsa_sent_end; 301 } dmu_sendarg_t; 302 303 void dmu_object_zapify(objset_t *, uint64_t, dmu_object_type_t, dmu_tx_t *); 304 void dmu_object_free_zapified(objset_t *, uint64_t, dmu_tx_t *); 305 int dmu_buf_hold_noread(objset_t *, uint64_t, uint64_t, 306 void *, dmu_buf_t **); 307 308 #ifdef __cplusplus 309 } 310 #endif 311 312 #endif /* _SYS_DMU_IMPL_H */ 313