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