dsl_dataset.h revision 323757
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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2011, 2015 by Delphix. All rights reserved. 24 * Copyright (c) 2013, Joyent, Inc. All rights reserved. 25 * Copyright (c) 2013 Steven Hartland. All rights reserved. 26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 27 * Copyright (c) 2014 Integros [integros.com] 28 */ 29 30#ifndef _SYS_DSL_DATASET_H 31#define _SYS_DSL_DATASET_H 32 33#include <sys/dmu.h> 34#include <sys/spa.h> 35#include <sys/txg.h> 36#include <sys/zio.h> 37#include <sys/bplist.h> 38#include <sys/dsl_synctask.h> 39#include <sys/zfs_context.h> 40#include <sys/dsl_deadlist.h> 41#include <sys/refcount.h> 42#include <sys/rrwlock.h> 43#include <zfeature_common.h> 44 45#ifdef __cplusplus 46extern "C" { 47#endif 48 49struct dsl_dataset; 50struct dsl_dir; 51struct dsl_pool; 52 53#define DS_FLAG_INCONSISTENT (1ULL<<0) 54#define DS_IS_INCONSISTENT(ds) \ 55 (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) 56 57/* 58 * Do not allow this dataset to be promoted. 59 */ 60#define DS_FLAG_NOPROMOTE (1ULL<<1) 61 62/* 63 * DS_FLAG_UNIQUE_ACCURATE is set if ds_unique_bytes has been correctly 64 * calculated for head datasets (starting with SPA_VERSION_UNIQUE_ACCURATE, 65 * refquota/refreservations). 66 */ 67#define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2) 68 69/* 70 * DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called 71 * on a dataset. This allows the dataset to be destroyed using 'zfs release'. 72 */ 73#define DS_FLAG_DEFER_DESTROY (1ULL<<3) 74#define DS_IS_DEFER_DESTROY(ds) \ 75 (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_DEFER_DESTROY) 76 77/* 78 * DS_FIELD_* are strings that are used in the "extensified" dataset zap object. 79 * They should be of the format <reverse-dns>:<field>. 80 */ 81 82/* 83 * This field's value is the object ID of a zap object which contains the 84 * bookmarks of this dataset. If it is present, then this dataset is counted 85 * in the refcount of the SPA_FEATURES_BOOKMARKS feature. 86 */ 87#define DS_FIELD_BOOKMARK_NAMES "com.delphix:bookmarks" 88 89/* 90 * These fields are set on datasets that are in the middle of a resumable 91 * receive, and allow the sender to resume the send if it is interrupted. 92 */ 93#define DS_FIELD_RESUME_FROMGUID "com.delphix:resume_fromguid" 94#define DS_FIELD_RESUME_TONAME "com.delphix:resume_toname" 95#define DS_FIELD_RESUME_TOGUID "com.delphix:resume_toguid" 96#define DS_FIELD_RESUME_OBJECT "com.delphix:resume_object" 97#define DS_FIELD_RESUME_OFFSET "com.delphix:resume_offset" 98#define DS_FIELD_RESUME_BYTES "com.delphix:resume_bytes" 99#define DS_FIELD_RESUME_LARGEBLOCK "com.delphix:resume_largeblockok" 100#define DS_FIELD_RESUME_EMBEDOK "com.delphix:resume_embedok" 101#define DS_FIELD_RESUME_COMPRESSOK "com.delphix:resume_compressok" 102 103/* 104 * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose 105 * name lookups should be performed case-insensitively. 106 */ 107#define DS_FLAG_CI_DATASET (1ULL<<16) 108 109#define DS_CREATE_FLAG_NODIRTY (1ULL<<24) 110 111typedef struct dsl_dataset_phys { 112 uint64_t ds_dir_obj; /* DMU_OT_DSL_DIR */ 113 uint64_t ds_prev_snap_obj; /* DMU_OT_DSL_DATASET */ 114 uint64_t ds_prev_snap_txg; 115 uint64_t ds_next_snap_obj; /* DMU_OT_DSL_DATASET */ 116 uint64_t ds_snapnames_zapobj; /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */ 117 uint64_t ds_num_children; /* clone/snap children; ==0 for head */ 118 uint64_t ds_creation_time; /* seconds since 1970 */ 119 uint64_t ds_creation_txg; 120 uint64_t ds_deadlist_obj; /* DMU_OT_DEADLIST */ 121 /* 122 * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes 123 * include all blocks referenced by this dataset, including those 124 * shared with any other datasets. 125 */ 126 uint64_t ds_referenced_bytes; 127 uint64_t ds_compressed_bytes; 128 uint64_t ds_uncompressed_bytes; 129 uint64_t ds_unique_bytes; /* only relevant to snapshots */ 130 /* 131 * The ds_fsid_guid is a 56-bit ID that can change to avoid 132 * collisions. The ds_guid is a 64-bit ID that will never 133 * change, so there is a small probability that it will collide. 134 */ 135 uint64_t ds_fsid_guid; 136 uint64_t ds_guid; 137 uint64_t ds_flags; /* DS_FLAG_* */ 138 blkptr_t ds_bp; 139 uint64_t ds_next_clones_obj; /* DMU_OT_DSL_CLONES */ 140 uint64_t ds_props_obj; /* DMU_OT_DSL_PROPS for snaps */ 141 uint64_t ds_userrefs_obj; /* DMU_OT_USERREFS */ 142 uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */ 143} dsl_dataset_phys_t; 144 145typedef struct dsl_dataset { 146 dmu_buf_user_t ds_dbu; 147 rrwlock_t ds_bp_rwlock; /* Protects ds_phys->ds_bp */ 148 149 /* Immutable: */ 150 struct dsl_dir *ds_dir; 151 dmu_buf_t *ds_dbuf; 152 uint64_t ds_object; 153 uint64_t ds_fsid_guid; 154 boolean_t ds_is_snapshot; 155 156 /* only used in syncing context, only valid for non-snapshots: */ 157 struct dsl_dataset *ds_prev; 158 uint64_t ds_bookmarks; /* DMU_OTN_ZAP_METADATA */ 159 160 /* has internal locking: */ 161 dsl_deadlist_t ds_deadlist; 162 bplist_t ds_pending_deadlist; 163 164 /* protected by lock on pool's dp_dirty_datasets list */ 165 txg_node_t ds_dirty_link; 166 list_node_t ds_synced_link; 167 168 /* 169 * ds_phys->ds_<accounting> is also protected by ds_lock. 170 * Protected by ds_lock: 171 */ 172 kmutex_t ds_lock; 173 objset_t *ds_objset; 174 uint64_t ds_userrefs; 175 void *ds_owner; 176 177 /* 178 * Long holds prevent the ds from being destroyed; they allow the 179 * ds to remain held even after dropping the dp_config_rwlock. 180 * Owning counts as a long hold. See the comments above 181 * dsl_pool_hold() for details. 182 */ 183 refcount_t ds_longholds; 184 185 /* no locking; only for making guesses */ 186 uint64_t ds_trysnap_txg; 187 188 /* for objset_open() */ 189 kmutex_t ds_opening_lock; 190 191 uint64_t ds_reserved; /* cached refreservation */ 192 uint64_t ds_quota; /* cached refquota */ 193 194 kmutex_t ds_sendstream_lock; 195 list_t ds_sendstreams; 196 197 /* 198 * When in the middle of a resumable receive, tracks how much 199 * progress we have made. 200 */ 201 uint64_t ds_resume_object[TXG_SIZE]; 202 uint64_t ds_resume_offset[TXG_SIZE]; 203 uint64_t ds_resume_bytes[TXG_SIZE]; 204 205 /* Protected by our dsl_dir's dd_lock */ 206 list_t ds_prop_cbs; 207 208 /* 209 * For ZFEATURE_FLAG_PER_DATASET features, set if this dataset 210 * uses this feature. 211 */ 212 uint8_t ds_feature_inuse[SPA_FEATURES]; 213 214 /* 215 * Set if we need to activate the feature on this dataset this txg 216 * (used only in syncing context). 217 */ 218 uint8_t ds_feature_activation_needed[SPA_FEATURES]; 219 220 /* Protected by ds_lock; keep at end of struct for better locality */ 221 char ds_snapname[ZFS_MAX_DATASET_NAME_LEN]; 222} dsl_dataset_t; 223 224inline dsl_dataset_phys_t * 225dsl_dataset_phys(dsl_dataset_t *ds) 226{ 227 return (ds->ds_dbuf->db_data); 228} 229 230/* 231 * The max length of a temporary tag prefix is the number of hex digits 232 * required to express UINT64_MAX plus one for the hyphen. 233 */ 234#define MAX_TAG_PREFIX_LEN 17 235 236#define dsl_dataset_is_snapshot(ds) \ 237 (dsl_dataset_phys(ds)->ds_num_children != 0) 238 239#define DS_UNIQUE_IS_ACCURATE(ds) \ 240 ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0) 241 242int dsl_dataset_hold(struct dsl_pool *dp, const char *name, void *tag, 243 dsl_dataset_t **dsp); 244boolean_t dsl_dataset_try_add_ref(struct dsl_pool *dp, dsl_dataset_t *ds, 245 void *tag); 246int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj, void *tag, 247 dsl_dataset_t **); 248void dsl_dataset_rele(dsl_dataset_t *ds, void *tag); 249int dsl_dataset_own(struct dsl_pool *dp, const char *name, 250 void *tag, dsl_dataset_t **dsp); 251int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj, 252 void *tag, dsl_dataset_t **dsp); 253void dsl_dataset_disown(dsl_dataset_t *ds, void *tag); 254void dsl_dataset_name(dsl_dataset_t *ds, char *name); 255boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag); 256int dsl_dataset_namelen(dsl_dataset_t *ds); 257boolean_t dsl_dataset_has_owner(dsl_dataset_t *ds); 258uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname, 259 dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *); 260uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 261 uint64_t flags, dmu_tx_t *tx); 262int dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors); 263int dsl_dataset_promote(const char *name, char *conflsnap); 264int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head, 265 boolean_t force); 266int dsl_dataset_rename_snapshot(const char *fsname, 267 const char *oldsnapname, const char *newsnapname, boolean_t recursive); 268int dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 269 minor_t cleanup_minor, const char *htag); 270 271blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds); 272 273spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds); 274 275boolean_t dsl_dataset_modified_since_snap(dsl_dataset_t *ds, 276 dsl_dataset_t *snap); 277 278void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx); 279void dsl_dataset_sync_done(dsl_dataset_t *os, dmu_tx_t *tx); 280 281void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, 282 dmu_tx_t *tx); 283int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, 284 dmu_tx_t *tx, boolean_t async); 285 286void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx); 287void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv); 288void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat); 289void dsl_dataset_space(dsl_dataset_t *ds, 290 uint64_t *refdbytesp, uint64_t *availbytesp, 291 uint64_t *usedobjsp, uint64_t *availobjsp); 292uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds); 293int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 294 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp); 295int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last, 296 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp); 297boolean_t dsl_dataset_is_dirty(dsl_dataset_t *ds); 298 299int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf); 300 301int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 302 uint64_t asize, uint64_t inflight, uint64_t *used, 303 uint64_t *ref_rsrv); 304int dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 305 uint64_t quota); 306int dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 307 uint64_t reservation); 308 309boolean_t dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 310 uint64_t earlier_txg); 311void dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag); 312void dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag); 313boolean_t dsl_dataset_long_held(dsl_dataset_t *ds); 314 315int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 316 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx); 317void dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 318 dsl_dataset_t *origin_head, dmu_tx_t *tx); 319int dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 320 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr); 321void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 322 dmu_tx_t *tx); 323 324void dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 325 dmu_tx_t *tx); 326void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds); 327int dsl_dataset_get_snapname(dsl_dataset_t *ds); 328int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, 329 uint64_t *value); 330int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 331 boolean_t adj_cnt); 332void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 333 zprop_source_t source, uint64_t value, dmu_tx_t *tx); 334void dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx); 335boolean_t dsl_dataset_is_zapified(dsl_dataset_t *ds); 336boolean_t dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds); 337int dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 338 nvlist_t *result); 339 340void dsl_dataset_deactivate_feature(uint64_t dsobj, 341 spa_feature_t f, dmu_tx_t *tx); 342 343#ifdef ZFS_DEBUG 344#define dprintf_ds(ds, fmt, ...) do { \ 345 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \ 346 char *__ds_name = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); \ 347 dsl_dataset_name(ds, __ds_name); \ 348 dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \ 349 kmem_free(__ds_name, ZFS_MAX_DATASET_NAME_LEN); \ 350 } \ 351_NOTE(CONSTCOND) } while (0) 352#else 353#define dprintf_ds(dd, fmt, ...) 354#endif 355 356#ifdef __cplusplus 357} 358#endif 359 360#endif /* _SYS_DSL_DATASET_H */ 361