dsl_dataset.h revision 2e2c135528b3edfe9aaf67d1f004dc0202fa1a54
/*
* 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) 2012 by Delphix. All rights reserved.
* Copyright (c) 2012, Joyent, Inc. 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>
#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) \
((ds)->ds_phys->ds_flags & DS_FLAG_INCONSISTENT)
/*
* NB: nopromote can not yet be set, but we want support for it in this
* on-disk version, so that we don't need to upgrade for it later. It
* will be needed when we implement 'zfs split' (where the split off
* clone should not 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) \
((ds)->ds_phys->ds_flags & DS_FLAG_DEFER_DESTROY)
/*
* 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)
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;
dsl_dataset_phys_t *ds_phys;
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;
/* has internal locking: */
dsl_deadlist_t ds_deadlist;
bplist_t ds_pending_deadlist;
/* to protect against multiple concurrent incremental recv */
kmutex_t ds_recvlock;
/* 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;
/*
* ds_owner is protected by the ds_rwlock and the ds_lock
*/
krwlock_t ds_rwlock;
kcondvar_t ds_exclusive_cv;
void *ds_owner;
/* 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;
struct dsl_ds_destroyarg {
dsl_dataset_t *ds; /* ds to destroy */
dsl_dataset_t *rm_origin; /* also remove our origin? */
boolean_t is_origin_rm; /* set if removing origin snap */
boolean_t defer; /* destroy -d requested? */
boolean_t releasing; /* destroying due to release? */
boolean_t need_prep; /* do we need to retry due to EBUSY? */
};
/*
* 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
struct dsl_ds_holdarg {
dsl_sync_task_group_t *dstg;
const char *htag;
char *snapname;
boolean_t recursive;
boolean_t gotone;
boolean_t temphold;
char failed[MAXPATHLEN];
};
#define dsl_dataset_is_snapshot(ds) \
((ds)->ds_phys->ds_num_children != 0)
#define DS_UNIQUE_IS_ACCURATE(ds) \
(((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
int dsl_dataset_hold(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 **);
int dsl_dataset_own(const char *name, boolean_t inconsistentok,
void *tag, dsl_dataset_t **dsp);
int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
boolean_t inconsistentok, void *tag, dsl_dataset_t **dsp);
void dsl_dataset_name(dsl_dataset_t *ds, char *name);
void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
void dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag);
boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok,
void *tag);
void dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *tag);
void dsl_register_onexit_hold_cleanup(dsl_dataset_t *ds, const char *htag,
minor_t minor);
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_destroy(dsl_dataset_t *ds, void *tag, boolean_t defer);
dsl_checkfunc_t dsl_dataset_destroy_check;
dsl_syncfunc_t dsl_dataset_destroy_sync;
dsl_syncfunc_t dsl_dataset_user_hold_sync;
int dsl_dataset_snapshot_check(dsl_dataset_t *ds, const char *, dmu_tx_t *tx);
void dsl_dataset_snapshot_sync(dsl_dataset_t *ds, const char *, dmu_tx_t *tx);
int dsl_dataset_rename(char *name, const char *newname, boolean_t recursive);
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_user_hold(char *dsname, char *snapname, char *htag,
boolean_t recursive, boolean_t temphold, int cleanup_fd);
int dsl_dataset_user_hold_for_send(dsl_dataset_t *ds, char *htag,
boolean_t temphold);
int dsl_dataset_user_release(char *dsname, char *snapname, char *htag,
boolean_t recursive);
int dsl_dataset_user_release_tmp(struct dsl_pool *dp, uint64_t dsobj,
char *htag, boolean_t retry);
int dsl_dataset_get_holds(const char *dsname, nvlist_t **nvp);
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_lastsnap(dsl_dataset_t *ds);
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_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_quota(const char *dsname, zprop_source_t source,
uint64_t quota);
dsl_syncfunc_t dsl_dataset_set_quota_sync;
int dsl_dataset_set_reservation(const char *dsname, zprop_source_t source,
uint64_t reservation);
int dsl_destroy_inconsistent(const char *dsname, void *arg);
#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 */