zfs/include/sys/dsl_dataset.h

   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) 2011, 2014 by Delphix. All rights reserved.
  25  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  26  * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
  27  */
  28
  29 #ifndef _SYS_DSL_DATASET_H
  30 #define _SYS_DSL_DATASET_H
  31
  32 #include <sys/dmu.h>
  33 #include <sys/spa.h>
  34 #include <sys/txg.h>
  35 #include <sys/zio.h>
  36 #include <sys/bplist.h>
  37 #include <sys/dsl_synctask.h>
  38 #include <sys/zfs_context.h>
  39 #include <sys/dsl_deadlist.h>
  40 #include <sys/refcount.h>
  41 #include <sys/rrwlock.h>
  42 #include <zfeature_common.h>
  43
  44 #ifdef  __cplusplus
  45 extern "C" {
  46 #endif
  47
  48 struct dsl_dataset;
  49 struct dsl_dir;
  50 struct dsl_pool;
  51
  52 #define DS_FLAG_INCONSISTENT    (1ULL<<0)
  53 #define DS_IS_INCONSISTENT(ds)  \
  54         (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT)
  55
  56 /*
  57  * Do not allow this dataset to be promoted.
  58  */
  59 #define DS_FLAG_NOPROMOTE       (1ULL<<1)
  60
  61 /*
  62  * DS_FLAG_UNIQUE_ACCURATE is set if ds_unique_bytes has been correctly
  63  * calculated for head datasets (starting with SPA_VERSION_UNIQUE_ACCURATE,
  64  * refquota/refreservations).
  65  */
  66 #define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)
  67
  68 /*
  69  * DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called
  70  * on a dataset. This allows the dataset to be destroyed using 'zfs release'.
  71  */
  72 #define DS_FLAG_DEFER_DESTROY   (1ULL<<3)
  73 #define DS_IS_DEFER_DESTROY(ds) \
  74         (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_DEFER_DESTROY)
  75
  76 /*
  77  * DS_FIELD_* are strings that are used in the "extensified" dataset zap object.
  78  * They should be of the format <reverse-dns>:<field>.
  79  */
  80
  81 /*
  82  * This field's value is the object ID of a zap object which contains the
  83  * bookmarks of this dataset.  If it is present, then this dataset is counted
  84  * in the refcount of the SPA_FEATURES_BOOKMARKS feature.
  85  */
  86 #define DS_FIELD_BOOKMARK_NAMES "com.delphix:bookmarks"
  87
  88 /*
  89  * This field is present (with value=0) if this dataset may contain large
  90  * dnodes (>512B).  If it is present, then this dataset is counted in the
  91  * refcount of the SPA_FEATURE_LARGE_DNODE feature.
  92  */
  93 #define DS_FIELD_LARGE_DNODE "org.zfsonlinux:large_dnode"
  94
  95 /*
  96  * These fields are set on datasets that are in the middle of a resumable
  97  * receive, and allow the sender to resume the send if it is interrupted.
  98  */
  99 #define DS_FIELD_RESUME_FROMGUID "com.delphix:resume_fromguid"
 100 #define DS_FIELD_RESUME_TONAME "com.delphix:resume_toname"
 101 #define DS_FIELD_RESUME_TOGUID "com.delphix:resume_toguid"
 102 #define DS_FIELD_RESUME_OBJECT "com.delphix:resume_object"
 103 #define DS_FIELD_RESUME_OFFSET "com.delphix:resume_offset"
 104 #define DS_FIELD_RESUME_BYTES "com.delphix:resume_bytes"
 105 #define DS_FIELD_RESUME_LARGEBLOCK "com.delphix:resume_largeblockok"
 106 #define DS_FIELD_RESUME_EMBEDOK "com.delphix:resume_embedok"
 107 #define DS_FIELD_RESUME_COMPRESSOK "com.delphix:resume_compressok"
 108
 109 /*
 110  * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
 111  * name lookups should be performed case-insensitively.
 112  */
 113 #define DS_FLAG_CI_DATASET      (1ULL<<16)
 114
 115 #define DS_CREATE_FLAG_NODIRTY  (1ULL<<24)
 116
 117 typedef struct dsl_dataset_phys {
 118         uint64_t ds_dir_obj;            /* DMU_OT_DSL_DIR */
 119         uint64_t ds_prev_snap_obj;      /* DMU_OT_DSL_DATASET */
 120         uint64_t ds_prev_snap_txg;
 121         uint64_t ds_next_snap_obj;      /* DMU_OT_DSL_DATASET */
 122         uint64_t ds_snapnames_zapobj;   /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
 123         uint64_t ds_num_children;       /* clone/snap children; ==0 for head */
 124         uint64_t ds_creation_time;      /* seconds since 1970 */
 125         uint64_t ds_creation_txg;
 126         uint64_t ds_deadlist_obj;       /* DMU_OT_DEADLIST */
 127         /*
 128          * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
 129          * include all blocks referenced by this dataset, including those
 130          * shared with any other datasets.
 131          */
 132         uint64_t ds_referenced_bytes;
 133         uint64_t ds_compressed_bytes;
 134         uint64_t ds_uncompressed_bytes;
 135         uint64_t ds_unique_bytes;       /* only relevant to snapshots */
 136         /*
 137          * The ds_fsid_guid is a 56-bit ID that can change to avoid
 138          * collisions.  The ds_guid is a 64-bit ID that will never
 139          * change, so there is a small probability that it will collide.
 140          */
 141         uint64_t ds_fsid_guid;
 142         uint64_t ds_guid;
 143         uint64_t ds_flags;              /* DS_FLAG_* */
 144         blkptr_t ds_bp;
 145         uint64_t ds_next_clones_obj;    /* DMU_OT_DSL_CLONES */
 146         uint64_t ds_props_obj;          /* DMU_OT_DSL_PROPS for snaps */
 147         uint64_t ds_userrefs_obj;       /* DMU_OT_USERREFS */
 148         uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
 149 } dsl_dataset_phys_t;
 150
 151 typedef struct dsl_dataset {
 152         dmu_buf_user_t ds_dbu;
 153         rrwlock_t ds_bp_rwlock; /* Protects ds_phys->ds_bp */
 154
 155         /* Immutable: */
 156         struct dsl_dir *ds_dir;
 157         dmu_buf_t *ds_dbuf;
 158         uint64_t ds_object;
 159         uint64_t ds_fsid_guid;
 160         boolean_t ds_is_snapshot;
 161
 162         /* only used in syncing context, only valid for non-snapshots: */
 163         struct dsl_dataset *ds_prev;
 164         uint64_t ds_bookmarks;  /* DMU_OTN_ZAP_METADATA */
 165
 166         /* has internal locking: */
 167         dsl_deadlist_t ds_deadlist;
 168         bplist_t ds_pending_deadlist;
 169
 170         /* protected by lock on pool's dp_dirty_datasets list */
 171         txg_node_t ds_dirty_link;
 172         list_node_t ds_synced_link;
 173
 174         /*
 175          * ds_phys->ds_<accounting> is also protected by ds_lock.
 176          * Protected by ds_lock:
 177          */
 178         kmutex_t ds_lock;
 179         objset_t *ds_objset;
 180         uint64_t ds_userrefs;
 181         void *ds_owner;
 182
 183         /*
 184          * Long holds prevent the ds from being destroyed; they allow the
 185          * ds to remain held even after dropping the dp_config_rwlock.
 186          * Owning counts as a long hold.  See the comments above
 187          * dsl_pool_hold() for details.
 188          */
 189         refcount_t ds_longholds;
 190
 191         /* no locking; only for making guesses */
 192         uint64_t ds_trysnap_txg;
 193
 194         /* for objset_open() */
 195         kmutex_t ds_opening_lock;
 196
 197         uint64_t ds_reserved;   /* cached refreservation */
 198         uint64_t ds_quota;      /* cached refquota */
 199
 200         kmutex_t ds_sendstream_lock;
 201         list_t ds_sendstreams;
 202
 203         /*
 204          * When in the middle of a resumable receive, tracks how much
 205          * progress we have made.
 206          */
 207         uint64_t ds_resume_object[TXG_SIZE];
 208         uint64_t ds_resume_offset[TXG_SIZE];
 209         uint64_t ds_resume_bytes[TXG_SIZE];
 210
 211         /* Protected by our dsl_dir's dd_lock */
 212         list_t ds_prop_cbs;
 213
 214         /*
 215          * For ZFEATURE_FLAG_PER_DATASET features, set if this dataset
 216          * uses this feature.
 217          */
 218         uint8_t ds_feature_inuse[SPA_FEATURES];
 219
 220         /*
 221          * Set if we need to activate the feature on this dataset this txg
 222          * (used only in syncing context).
 223          */
 224         uint8_t ds_feature_activation_needed[SPA_FEATURES];
 225
 226         /* Protected by ds_lock; keep at end of struct for better locality */
 227         char ds_snapname[ZFS_MAX_DATASET_NAME_LEN];
 228 } dsl_dataset_t;
 229
 230 static inline dsl_dataset_phys_t *
 231 dsl_dataset_phys(dsl_dataset_t *ds)
 232 {
 233         return (ds->ds_dbuf->db_data);
 234 }
 235
 236 /*
 237  * The max length of a temporary tag prefix is the number of hex digits
 238  * required to express UINT64_MAX plus one for the hyphen.
 239  */
 240 #define MAX_TAG_PREFIX_LEN      17
 241
 242 #define dsl_dataset_is_snapshot(ds) \
 243         (dsl_dataset_phys(ds)->ds_num_children != 0)
 244
 245 #define DS_UNIQUE_IS_ACCURATE(ds)       \
 246         ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
 247
 248 int dsl_dataset_hold(struct dsl_pool *dp, const char *name, void *tag,
 249     dsl_dataset_t **dsp);
 250 boolean_t dsl_dataset_try_add_ref(struct dsl_pool *dp, dsl_dataset_t *ds,
 251     void *tag);
 252 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj, void *tag,
 253     dsl_dataset_t **);
 254 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
 255 int dsl_dataset_own(struct dsl_pool *dp, const char *name,
 256     void *tag, dsl_dataset_t **dsp);
 257 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
 258     void *tag, dsl_dataset_t **dsp);
 259 void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
 260 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
 261 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag);
 262 int dsl_dataset_namelen(dsl_dataset_t *ds);
 263 boolean_t dsl_dataset_has_owner(dsl_dataset_t *ds);
 264 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
 265     dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
 266 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
 267     uint64_t flags, dmu_tx_t *tx);
 268 int dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors);
 269 int dsl_dataset_promote(const char *name, char *conflsnap);
 270 int dsl_dataset_rename_snapshot(const char *fsname,
 271     const char *oldsnapname, const char *newsnapname, boolean_t recursive);
 272 int dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
 273     minor_t cleanup_minor, const char *htag);
 274
 275 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
 276
 277 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
 278
 279 boolean_t dsl_dataset_modified_since_snap(dsl_dataset_t *ds,
 280     dsl_dataset_t *snap);
 281
 282 void dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx);
 283 void dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx);
 284
 285 void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
 286     dmu_tx_t *tx);
 287 int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
 288     dmu_tx_t *tx, boolean_t async);
 289 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
 290     uint64_t *value);
 291
 292 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
 293 void dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv);
 294 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
 295 void dsl_dataset_space(dsl_dataset_t *ds,
 296     uint64_t *refdbytesp, uint64_t *availbytesp,
 297     uint64_t *usedobjsp, uint64_t *availobjsp);
 298 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
 299 int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
 300     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
 301 int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
 302     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
 303 boolean_t dsl_dataset_is_dirty(dsl_dataset_t *ds);
 304
 305 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
 306
 307 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
 308     uint64_t asize, uint64_t inflight, uint64_t *used,
 309     uint64_t *ref_rsrv);
 310 int dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
 311     uint64_t quota);
 312 int dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
 313     uint64_t reservation);
 314
 315 boolean_t dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
 316     uint64_t earlier_txg);
 317 void dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag);
 318 void dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag);
 319 boolean_t dsl_dataset_long_held(dsl_dataset_t *ds);
 320
 321 int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
 322     dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx);
 323 void dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
 324     dsl_dataset_t *origin_head, dmu_tx_t *tx);
 325 int dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
 326     dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr);
 327 void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
 328     dmu_tx_t *tx);
 329
 330 void dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
 331     dmu_tx_t *tx);
 332 void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds);
 333 int dsl_dataset_get_snapname(dsl_dataset_t *ds);
 334 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
 335     uint64_t *value);
 336 int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
 337     boolean_t adj_cnt);
 338 void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
 339     zprop_source_t source, uint64_t value, dmu_tx_t *tx);
 340 void dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx);
 341 boolean_t dsl_dataset_is_zapified(dsl_dataset_t *ds);
 342 boolean_t dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds);
 343 int dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner,
 344     nvlist_t *result);
 345
 346 void dsl_dataset_deactivate_feature(uint64_t dsobj,
 347     spa_feature_t f, dmu_tx_t *tx);
 348
 349 #ifdef ZFS_DEBUG
 350 #define dprintf_ds(ds, fmt, ...) do { \
 351         if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
 352         char *__ds_name = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); \
 353         dsl_dataset_name(ds, __ds_name); \
 354         dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
 355         kmem_free(__ds_name, ZFS_MAX_DATASET_NAME_LEN); \
 356         } \
 357 _NOTE(CONSTCOND) } while (0)
 358 #else
 359 #define dprintf_ds(dd, fmt, ...)
 360 #endif
 361
 362 #ifdef  __cplusplus
 363 }
 364 #endif
 365
 366 #endif /* _SYS_DSL_DATASET_H */