zfs/lib/libzpool/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 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_DSL_DATASET_H
  27 #define _SYS_DSL_DATASET_H
  28
  29 #include <sys/dmu.h>
  30 #include <sys/spa.h>
  31 #include <sys/txg.h>
  32 #include <sys/zio.h>
  33 #include <sys/bplist.h>
  34 #include <sys/dsl_synctask.h>
  35 #include <sys/zfs_context.h>
  36
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 struct dsl_dataset;
  42 struct dsl_dir;
  43 struct dsl_pool;
  44
  45 typedef void dsl_dataset_evict_func_t(struct dsl_dataset *, void *);
  46
  47 #define DS_FLAG_INCONSISTENT    (1ULL<<0)
  48 #define DS_IS_INCONSISTENT(ds)  \
  49         ((ds)->ds_phys->ds_flags & DS_FLAG_INCONSISTENT)
  50 /*
  51  * NB: nopromote can not yet be set, but we want support for it in this
  52  * on-disk version, so that we don't need to upgrade for it later.  It
  53  * will be needed when we implement 'zfs split' (where the split off
  54  * clone should not 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_CI_DATASET is set if the dataset contains a file system whose
  67  * name lookups should be performed case-insensitively.
  68  */
  69 #define DS_FLAG_CI_DATASET      (1ULL<<16)
  70
  71 typedef struct dsl_dataset_phys {
  72         uint64_t ds_dir_obj;            /* DMU_OT_DSL_DIR */
  73         uint64_t ds_prev_snap_obj;      /* DMU_OT_DSL_DATASET */
  74         uint64_t ds_prev_snap_txg;
  75         uint64_t ds_next_snap_obj;      /* DMU_OT_DSL_DATASET */
  76         uint64_t ds_snapnames_zapobj;   /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
  77         uint64_t ds_num_children;       /* clone/snap children; ==0 for head */
  78         uint64_t ds_creation_time;      /* seconds since 1970 */
  79         uint64_t ds_creation_txg;
  80         uint64_t ds_deadlist_obj;       /* DMU_OT_BPLIST */
  81         uint64_t ds_used_bytes;
  82         uint64_t ds_compressed_bytes;
  83         uint64_t ds_uncompressed_bytes;
  84         uint64_t ds_unique_bytes;       /* only relevant to snapshots */
  85         /*
  86          * The ds_fsid_guid is a 56-bit ID that can change to avoid
  87          * collisions.  The ds_guid is a 64-bit ID that will never
  88          * change, so there is a small probability that it will collide.
  89          */
  90         uint64_t ds_fsid_guid;
  91         uint64_t ds_guid;
  92         uint64_t ds_flags;              /* DS_FLAG_* */
  93         blkptr_t ds_bp;
  94         uint64_t ds_next_clones_obj;    /* DMU_OT_DSL_CLONES */
  95         uint64_t ds_props_obj;          /* DMU_OT_DSL_PROPS for snaps */
  96         uint64_t ds_pad[6]; /* pad out to 320 bytes for good measure */
  97 } dsl_dataset_phys_t;
  98
  99 typedef struct dsl_dataset {
 100         /* Immutable: */
 101         struct dsl_dir *ds_dir;
 102         dsl_dataset_phys_t *ds_phys;
 103         dmu_buf_t *ds_dbuf;
 104         uint64_t ds_object;
 105         uint64_t ds_fsid_guid;
 106
 107         /* only used in syncing context, only valid for non-snapshots: */
 108         struct dsl_dataset *ds_prev;
 109         uint64_t ds_origin_txg;
 110
 111         /* has internal locking: */
 112         bplist_t ds_deadlist;
 113
 114         /* protected by lock on pool's dp_dirty_datasets list */
 115         txg_node_t ds_dirty_link;
 116         list_node_t ds_synced_link;
 117
 118         /*
 119          * ds_phys->ds_<accounting> is also protected by ds_lock.
 120          * Protected by ds_lock:
 121          */
 122         kmutex_t ds_lock;
 123         void *ds_user_ptr;
 124         dsl_dataset_evict_func_t *ds_user_evict_func;
 125
 126         /*
 127          * ds_owner is protected by the ds_rwlock and the ds_lock
 128          */
 129         krwlock_t ds_rwlock;
 130         kcondvar_t ds_exclusive_cv;
 131         void *ds_owner;
 132
 133         /* no locking; only for making guesses */
 134         uint64_t ds_trysnap_txg;
 135
 136         /* for objset_open() */
 137         kmutex_t ds_opening_lock;
 138
 139         uint64_t ds_reserved;   /* cached refreservation */
 140         uint64_t ds_quota;      /* cached refquota */
 141
 142         /* Protected by ds_lock; keep at end of struct for better locality */
 143         char ds_snapname[MAXNAMELEN];
 144 } dsl_dataset_t;
 145
 146 #define dsl_dataset_is_snapshot(ds)     \
 147         ((ds)->ds_phys->ds_num_children != 0)
 148
 149 #define DS_UNIQUE_IS_ACCURATE(ds)       \
 150         (((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
 151
 152 int dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp);
 153 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj,
 154     void *tag, dsl_dataset_t **);
 155 int dsl_dataset_own(const char *name, int flags, void *owner,
 156     dsl_dataset_t **dsp);
 157 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
 158     int flags, void *owner, dsl_dataset_t **);
 159 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
 160 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
 161 void dsl_dataset_disown(dsl_dataset_t *ds, void *owner);
 162 void dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag);
 163 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok,
 164     void *owner);
 165 void dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *owner);
 166 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
 167     dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
 168 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
 169     uint64_t flags, dmu_tx_t *tx);
 170 int dsl_dataset_destroy(dsl_dataset_t *ds, void *tag);
 171 int dsl_snapshots_destroy(char *fsname, char *snapname);
 172 dsl_checkfunc_t dsl_dataset_destroy_check;
 173 dsl_syncfunc_t dsl_dataset_destroy_sync;
 174 dsl_checkfunc_t dsl_dataset_snapshot_check;
 175 dsl_syncfunc_t dsl_dataset_snapshot_sync;
 176 int dsl_dataset_rollback(dsl_dataset_t *ds, dmu_objset_type_t ost);
 177 int dsl_dataset_rename(char *name, const char *newname, boolean_t recursive);
 178 int dsl_dataset_promote(const char *name);
 179 int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
 180     boolean_t force);
 181
 182 void *dsl_dataset_set_user_ptr(dsl_dataset_t *ds,
 183     void *p, dsl_dataset_evict_func_t func);
 184 void *dsl_dataset_get_user_ptr(dsl_dataset_t *ds);
 185
 186 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
 187 void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
 188
 189 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
 190
 191 boolean_t dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds);
 192
 193 void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);
 194
 195 void dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
 196 int dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio,
 197     dmu_tx_t *tx);
 198 int dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth);
 199 uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds);
 200
 201 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
 202 void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
 203 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
 204 void dsl_dataset_space(dsl_dataset_t *ds,
 205     uint64_t *refdbytesp, uint64_t *availbytesp,
 206     uint64_t *usedobjsp, uint64_t *availobjsp);
 207 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
 208
 209 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
 210
 211 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
 212     uint64_t asize, uint64_t inflight, uint64_t *used,
 213     uint64_t *ref_rsrv);
 214 int dsl_dataset_set_quota(const char *dsname, uint64_t quota);
 215 void dsl_dataset_set_quota_sync(void *arg1, void *arg2, cred_t *cr,
 216     dmu_tx_t *tx);
 217 int dsl_dataset_set_reservation(const char *dsname, uint64_t reservation);
 218 void dsl_dataset_set_flags(dsl_dataset_t *ds, uint64_t flags);
 219 int64_t dsl_dataset_new_refreservation(dsl_dataset_t *ds, uint64_t reservation,
 220     dmu_tx_t *tx);
 221
 222 #ifdef ZFS_DEBUG
 223 #define dprintf_ds(ds, fmt, ...) do { \
 224         if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
 225         char *__ds_name = kmem_alloc(MAXNAMELEN, KM_SLEEP); \
 226         dsl_dataset_name(ds, __ds_name); \
 227         dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
 228         kmem_free(__ds_name, MAXNAMELEN); \
 229         } \
 230 _NOTE(CONSTCOND) } while (0)
 231 #else
 232 #define dprintf_ds(dd, fmt, ...)
 233 #endif
 234
 235 #ifdef  __cplusplus
 236 }
 237 #endif
 238
 239 #endif /* _SYS_DSL_DATASET_H */