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) 2013 by Delphix. All rights reserved.
  24  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
  25  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  26  */
  27
  28 #ifndef _SYS_DSL_DATASET_H
  29 #define _SYS_DSL_DATASET_H
  30
  31 #include <sys/dmu.h>
  32 #include <sys/spa.h>
  33 #include <sys/txg.h>
  34 #include <sys/zio.h>
  35 #include <sys/bplist.h>
  36 #include <sys/dsl_synctask.h>
  37 #include <sys/zfs_context.h>
  38 #include <sys/dsl_deadlist.h>
  39 #include <sys/refcount.h>
  40
  41 #ifdef  __cplusplus
  42 extern "C" {
  43 #endif
  44
  45 struct dsl_dataset;
  46 struct dsl_dir;
  47 struct dsl_pool;
  48
  49 #define DS_FLAG_INCONSISTENT    (1ULL<<0)
  50 #define DS_IS_INCONSISTENT(ds)  \
  51         ((ds)->ds_phys->ds_flags & DS_FLAG_INCONSISTENT)
  52
  53 /*
  54  * Do not allow this dataset to be promoted.
  55  */
  56 #define DS_FLAG_NOPROMOTE       (1ULL<<1)
  57
  58 /*
  59  * DS_FLAG_UNIQUE_ACCURATE is set if ds_unique_bytes has been correctly
  60  * calculated for head datasets (starting with SPA_VERSION_UNIQUE_ACCURATE,
  61  * refquota/refreservations).
  62  */
  63 #define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)
  64
  65 /*
  66  * DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called
  67  * on a dataset. This allows the dataset to be destroyed using 'zfs release'.
  68  */
  69 #define DS_FLAG_DEFER_DESTROY   (1ULL<<3)
  70 #define DS_IS_DEFER_DESTROY(ds) \
  71         ((ds)->ds_phys->ds_flags & DS_FLAG_DEFER_DESTROY)
  72
  73 /*
  74  * DS_FIELD_* are strings that are used in the "extensified" dataset zap object.
  75  * They should be of the format <reverse-dns>:<field>.
  76  */
  77
  78 /*
  79  * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
  80  * name lookups should be performed case-insensitively.
  81  */
  82 #define DS_FLAG_CI_DATASET      (1ULL<<16)
  83
  84 #define DS_CREATE_FLAG_NODIRTY  (1ULL<<24)
  85
  86 typedef struct dsl_dataset_phys {
  87         uint64_t ds_dir_obj;            /* DMU_OT_DSL_DIR */
  88         uint64_t ds_prev_snap_obj;      /* DMU_OT_DSL_DATASET */
  89         uint64_t ds_prev_snap_txg;
  90         uint64_t ds_next_snap_obj;      /* DMU_OT_DSL_DATASET */
  91         uint64_t ds_snapnames_zapobj;   /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
  92         uint64_t ds_num_children;       /* clone/snap children; ==0 for head */
  93         uint64_t ds_creation_time;      /* seconds since 1970 */
  94         uint64_t ds_creation_txg;
  95         uint64_t ds_deadlist_obj;       /* DMU_OT_DEADLIST */
  96         /*
  97          * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
  98          * include all blocks referenced by this dataset, including those
  99          * shared with any other datasets.
 100          */
 101         uint64_t ds_referenced_bytes;
 102         uint64_t ds_compressed_bytes;
 103         uint64_t ds_uncompressed_bytes;
 104         uint64_t ds_unique_bytes;       /* only relevant to snapshots */
 105         /*
 106          * The ds_fsid_guid is a 56-bit ID that can change to avoid
 107          * collisions.  The ds_guid is a 64-bit ID that will never
 108          * change, so there is a small probability that it will collide.
 109          */
 110         uint64_t ds_fsid_guid;
 111         uint64_t ds_guid;
 112         uint64_t ds_flags;              /* DS_FLAG_* */
 113         blkptr_t ds_bp;
 114         uint64_t ds_next_clones_obj;    /* DMU_OT_DSL_CLONES */
 115         uint64_t ds_props_obj;          /* DMU_OT_DSL_PROPS for snaps */
 116         uint64_t ds_userrefs_obj;       /* DMU_OT_USERREFS */
 117         uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
 118 } dsl_dataset_phys_t;
 119
 120 typedef struct dsl_dataset {
 121         /* Immutable: */
 122         struct dsl_dir *ds_dir;
 123         dsl_dataset_phys_t *ds_phys;
 124         dmu_buf_t *ds_dbuf;
 125         uint64_t ds_object;
 126         uint64_t ds_fsid_guid;
 127
 128         /* only used in syncing context, only valid for non-snapshots: */
 129         struct dsl_dataset *ds_prev;
 130
 131         /* has internal locking: */
 132         dsl_deadlist_t ds_deadlist;
 133         bplist_t ds_pending_deadlist;
 134
 135         /* protected by lock on pool's dp_dirty_datasets list */
 136         txg_node_t ds_dirty_link;
 137         list_node_t ds_synced_link;
 138
 139         /*
 140          * ds_phys->ds_<accounting> is also protected by ds_lock.
 141          * Protected by ds_lock:
 142          */
 143         kmutex_t ds_lock;
 144         objset_t *ds_objset;
 145         uint64_t ds_userrefs;
 146         void *ds_owner;
 147
 148         /*
 149          * Long holds prevent the ds from being destroyed; they allow the
 150          * ds to remain held even after dropping the dp_config_rwlock.
 151          * Owning counts as a long hold.  See the comments above
 152          * dsl_pool_hold() for details.
 153          */
 154         refcount_t ds_longholds;
 155
 156         /* no locking; only for making guesses */
 157         uint64_t ds_trysnap_txg;
 158
 159         /* for objset_open() */
 160         kmutex_t ds_opening_lock;
 161
 162         uint64_t ds_reserved;   /* cached refreservation */
 163         uint64_t ds_quota;      /* cached refquota */
 164
 165         kmutex_t ds_sendstream_lock;
 166         list_t ds_sendstreams;
 167
 168         /* Protected by ds_lock; keep at end of struct for better locality */
 169         char ds_snapname[MAXNAMELEN];
 170 } dsl_dataset_t;
 171
 172 /*
 173  * The max length of a temporary tag prefix is the number of hex digits
 174  * required to express UINT64_MAX plus one for the hyphen.
 175  */
 176 #define MAX_TAG_PREFIX_LEN      17
 177
 178 #define dsl_dataset_is_snapshot(ds) \
 179         ((ds)->ds_phys->ds_num_children != 0)
 180
 181 #define DS_UNIQUE_IS_ACCURATE(ds)       \
 182         (((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
 183
 184 int dsl_dataset_hold(struct dsl_pool *dp, const char *name, void *tag,
 185     dsl_dataset_t **dsp);
 186 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj, void *tag,
 187     dsl_dataset_t **);
 188 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
 189 int dsl_dataset_own(struct dsl_pool *dp, const char *name,
 190     void *tag, dsl_dataset_t **dsp);
 191 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
 192     void *tag, dsl_dataset_t **dsp);
 193 void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
 194 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
 195 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag);
 196 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
 197     dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
 198 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
 199     uint64_t flags, dmu_tx_t *tx);
 200 int dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors);
 201 int dsl_dataset_promote(const char *name, char *conflsnap);
 202 int dsl_dataset_rename_snapshot(const char *fsname,
 203     const char *oldsnapname, const char *newsnapname, boolean_t recursive);
 204 int dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
 205     minor_t cleanup_minor, const char *htag);
 206
 207 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
 208 void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
 209
 210 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
 211
 212 boolean_t dsl_dataset_modified_since_snap(dsl_dataset_t *ds,
 213     dsl_dataset_t *snap);
 214
 215 void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);
 216
 217 void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
 218     dmu_tx_t *tx);
 219 int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
 220     dmu_tx_t *tx, boolean_t async);
 221 boolean_t dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
 222     uint64_t blk_birth);
 223 uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds);
 224 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
 225     uint64_t *value);
 226
 227 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
 228 void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
 229 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
 230 void dsl_dataset_space(dsl_dataset_t *ds,
 231     uint64_t *refdbytesp, uint64_t *availbytesp,
 232     uint64_t *usedobjsp, uint64_t *availobjsp);
 233 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
 234 int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
 235     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
 236 int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
 237     uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
 238 boolean_t dsl_dataset_is_dirty(dsl_dataset_t *ds);
 239
 240 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
 241
 242 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
 243     uint64_t asize, uint64_t inflight, uint64_t *used,
 244     uint64_t *ref_rsrv);
 245 int dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
 246     uint64_t quota);
 247 int dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
 248     uint64_t reservation);
 249
 250 boolean_t dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier);
 251 void dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag);
 252 void dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag);
 253 boolean_t dsl_dataset_long_held(dsl_dataset_t *ds);
 254
 255 int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
 256     dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx);
 257 void dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
 258     dsl_dataset_t *origin_head, dmu_tx_t *tx);
 259 int dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
 260     dmu_tx_t *tx, boolean_t recv);
 261 void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
 262     dmu_tx_t *tx);
 263
 264 void dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
 265     dmu_tx_t *tx);
 266 void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds);
 267 int dsl_dataset_get_snapname(dsl_dataset_t *ds);
 268 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
 269     uint64_t *value);
 270 int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx);
 271 void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
 272     zprop_source_t source, uint64_t value, dmu_tx_t *tx);
 273 int dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result);
 274
 275 #ifdef ZFS_DEBUG
 276 #define dprintf_ds(ds, fmt, ...) do { \
 277         if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
 278         char *__ds_name = kmem_alloc(MAXNAMELEN, KM_PUSHPAGE); \
 279         dsl_dataset_name(ds, __ds_name); \
 280         dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
 281         kmem_free(__ds_name, MAXNAMELEN); \
 282         } \
 283 _NOTE(CONSTCOND) } while (0)
 284 #else
 285 #define dprintf_ds(dd, fmt, ...)
 286 #endif
 287
 288 #ifdef  __cplusplus
 289 }
 290 #endif
 291
 292 #endif /* _SYS_DSL_DATASET_H */