zfs/sys/dsl_dataset.h

	dsl_dataset.h revision c1379625401dfbe1c39b79136dd384a571d47fde
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2013 by Delphix. All rights reserved.
 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
 * Copyright (c) 2013 Steven Hartland. All rights reserved.
 */

#ifndef _SYS_DSL_DATASET_H
#define _SYS_DSL_DATASET_H

#include <sys/dmu.h>
#include <sys/spa.h>
#include <sys/txg.h>
#include <sys/zio.h>
#include <sys/bplist.h>
#include <sys/dsl_synctask.h>
#include <sys/zfs_context.h>
#include <sys/dsl_deadlist.h>
#include <sys/refcount.h>

#ifdef  __cplusplus
extern "C" {
#endif

struct dsl_dataset;
struct dsl_dir;
struct dsl_pool;

#define DS_FLAG_INCONSISTENT    (1ULL<<0)
#define DS_IS_INCONSISTENT(ds)  \
    (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT)

/*
 * Do not allow this dataset to be promoted.
 */
#define DS_FLAG_NOPROMOTE   (1ULL<<1)

/*
 * DS_FLAG_UNIQUE_ACCURATE is set if ds_unique_bytes has been correctly
 * calculated for head datasets (starting with SPA_VERSION_UNIQUE_ACCURATE,
 * refquota/refreservations).
 */
#define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)

/*
 * DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called
 * on a dataset. This allows the dataset to be destroyed using 'zfs release'.
 */
#define DS_FLAG_DEFER_DESTROY   (1ULL<<3)
#define DS_IS_DEFER_DESTROY(ds) \
    (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_DEFER_DESTROY)

/*
 * DS_FIELD_* are strings that are used in the "extensified" dataset zap object.
 * They should be of the format <reverse-dns>:<field>.
 */

/*
 * This field's value is the object ID of a zap object which contains the
 * bookmarks of this dataset.  If it is present, then this dataset is counted
 * in the refcount of the SPA_FEATURES_BOOKMARKS feature.
 */
#define DS_FIELD_BOOKMARK_NAMES "com.delphix:bookmarks"

/*
 * This field is present (with value=0) if this dataset may contain large
 * blocks (>128KB).  If it is present, then this dataset
 * is counted in the refcount of the SPA_FEATURE_LARGE_BLOCKS feature.
 */
#define DS_FIELD_LARGE_BLOCKS "org.open-zfs:large_blocks"

/*
 * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
 * name lookups should be performed case-insensitively.
 */
#define DS_FLAG_CI_DATASET  (1ULL<<16)

#define DS_CREATE_FLAG_NODIRTY  (1ULL<<24)

typedef struct dsl_dataset_phys {
    uint64_t ds_dir_obj;        /* DMU_OT_DSL_DIR */
    uint64_t ds_prev_snap_obj;  /* DMU_OT_DSL_DATASET */
    uint64_t ds_prev_snap_txg;
    uint64_t ds_next_snap_obj;  /* DMU_OT_DSL_DATASET */
    uint64_t ds_snapnames_zapobj;   /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
    uint64_t ds_num_children;   /* clone/snap children; ==0 for head */
    uint64_t ds_creation_time;  /* seconds since 1970 */
    uint64_t ds_creation_txg;
    uint64_t ds_deadlist_obj;   /* DMU_OT_DEADLIST */
    /*
     * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
     * include all blocks referenced by this dataset, including those
     * shared with any other datasets.
     */
    uint64_t ds_referenced_bytes;
    uint64_t ds_compressed_bytes;
    uint64_t ds_uncompressed_bytes;
    uint64_t ds_unique_bytes;   /* only relevant to snapshots */
    /*
     * The ds_fsid_guid is a 56-bit ID that can change to avoid
     * collisions.  The ds_guid is a 64-bit ID that will never
     * change, so there is a small probability that it will collide.
     */
    uint64_t ds_fsid_guid;
    uint64_t ds_guid;
    uint64_t ds_flags;      /* DS_FLAG_* */
    blkptr_t ds_bp;
    uint64_t ds_next_clones_obj;    /* DMU_OT_DSL_CLONES */
    uint64_t ds_props_obj;      /* DMU_OT_DSL_PROPS for snaps */
    uint64_t ds_userrefs_obj;   /* DMU_OT_USERREFS */
    uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
} dsl_dataset_phys_t;

typedef struct dsl_dataset {
    /* Immutable: */
    struct dsl_dir *ds_dir;
    dmu_buf_t *ds_dbuf;
    uint64_t ds_object;
    uint64_t ds_fsid_guid;

    /* only used in syncing context, only valid for non-snapshots: */
    struct dsl_dataset *ds_prev;
    uint64_t ds_bookmarks;  /* DMU_OTN_ZAP_METADATA */
    boolean_t ds_large_blocks;
    boolean_t ds_need_large_blocks;

    /* has internal locking: */
    dsl_deadlist_t ds_deadlist;
    bplist_t ds_pending_deadlist;

    /* protected by lock on pool's dp_dirty_datasets list */
    txg_node_t ds_dirty_link;
    list_node_t ds_synced_link;

    /*
     * ds_phys->ds_<accounting> is also protected by ds_lock.
     * Protected by ds_lock:
     */
    kmutex_t ds_lock;
    objset_t *ds_objset;
    uint64_t ds_userrefs;
    void *ds_owner;

    /*
     * Long holds prevent the ds from being destroyed; they allow the
     * ds to remain held even after dropping the dp_config_rwlock.
     * Owning counts as a long hold.  See the comments above
     * dsl_pool_hold() for details.
     */
    refcount_t ds_longholds;

    /* no locking; only for making guesses */
    uint64_t ds_trysnap_txg;

    /* for objset_open() */
    kmutex_t ds_opening_lock;

    uint64_t ds_reserved;   /* cached refreservation */
    uint64_t ds_quota;  /* cached refquota */

    kmutex_t ds_sendstream_lock;
    list_t ds_sendstreams;

    /* Protected by ds_lock; keep at end of struct for better locality */
    char ds_snapname[MAXNAMELEN];
} dsl_dataset_t;

inline dsl_dataset_phys_t *
dsl_dataset_phys(dsl_dataset_t *ds)
{
    return (ds->ds_dbuf->db_data);
}

/*
 * The max length of a temporary tag prefix is the number of hex digits
 * required to express UINT64_MAX plus one for the hyphen.
 */
#define MAX_TAG_PREFIX_LEN  17

inline boolean_t
dsl_dataset_is_snapshot(dsl_dataset_t *ds)
{
    return (dsl_dataset_phys(ds)->ds_num_children != 0);
}

#define DS_UNIQUE_IS_ACCURATE(ds)   \
    ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)

int dsl_dataset_hold(struct dsl_pool *dp, const char *name, void *tag,
    dsl_dataset_t **dsp);
int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj, void *tag,
    dsl_dataset_t **);
void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
int dsl_dataset_own(struct dsl_pool *dp, const char *name,
    void *tag, dsl_dataset_t **dsp);
int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
    void *tag, dsl_dataset_t **dsp);
void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
void dsl_dataset_name(dsl_dataset_t *ds, char *name);
boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag);
uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
    dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
    uint64_t flags, dmu_tx_t *tx);
int dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors);
int dsl_dataset_promote(const char *name, char *conflsnap);
int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
    boolean_t force);
int dsl_dataset_rename_snapshot(const char *fsname,
    const char *oldsnapname, const char *newsnapname, boolean_t recursive);
int dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
    minor_t cleanup_minor, const char *htag);

blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);

spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);

boolean_t dsl_dataset_modified_since_snap(dsl_dataset_t *ds,
    dsl_dataset_t *snap);

void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);

void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
    dmu_tx_t *tx);
int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
    dmu_tx_t *tx, boolean_t async);
boolean_t dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
    uint64_t blk_birth);
uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds);

void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
void dsl_dataset_space(dsl_dataset_t *ds,
    uint64_t *refdbytesp, uint64_t *availbytesp,
    uint64_t *usedobjsp, uint64_t *availobjsp);
uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
    uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
    uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
boolean_t dsl_dataset_is_dirty(dsl_dataset_t *ds);
int dsl_dataset_activate_large_blocks(const char *dsname);
void dsl_dataset_activate_large_blocks_sync_impl(uint64_t dsobj, dmu_tx_t *tx);

int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);

int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
    uint64_t asize, uint64_t inflight, uint64_t *used,
    uint64_t *ref_rsrv);
int dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
    uint64_t quota);
int dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
    uint64_t reservation);

boolean_t dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier,
    uint64_t earlier_txg);
void dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag);
void dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag);
boolean_t dsl_dataset_long_held(dsl_dataset_t *ds);

int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
    dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx);
void dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
    dsl_dataset_t *origin_head, dmu_tx_t *tx);
int dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
    dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr);
void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
    dmu_tx_t *tx);

void dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
    dmu_tx_t *tx);
void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds);
int dsl_dataset_get_snapname(dsl_dataset_t *ds);
int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
    uint64_t *value);
int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx,
    boolean_t adj_cnt);
void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
    zprop_source_t source, uint64_t value, dmu_tx_t *tx);
void dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx);
int dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result);

#ifdef ZFS_DEBUG
#define dprintf_ds(ds, fmt, ...) do { \
    if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
    char *__ds_name = kmem_alloc(MAXNAMELEN, KM_SLEEP); \
    dsl_dataset_name(ds, __ds_name); \
    dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
    kmem_free(__ds_name, MAXNAMELEN); \
    } \
_NOTE(CONSTCOND) } while (0)
#else
#define dprintf_ds(dd, fmt, ...)
#endif

#ifdef  __cplusplus
}
#endif

#endif /* _SYS_DSL_DATASET_H */