299 lines
10 KiB
C
299 lines
10 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012 by Delphix. All rights reserved.
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* Copyright (c) 2012, Joyent, Inc. All rights reserved.
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*/
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#ifndef _SYS_DSL_DATASET_H
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#define _SYS_DSL_DATASET_H
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#include <sys/dmu.h>
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#include <sys/spa.h>
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#include <sys/txg.h>
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#include <sys/zio.h>
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#include <sys/bplist.h>
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#include <sys/dsl_synctask.h>
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#include <sys/zfs_context.h>
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#include <sys/dsl_deadlist.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct dsl_dataset;
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struct dsl_dir;
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struct dsl_pool;
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#define DS_FLAG_INCONSISTENT (1ULL<<0)
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#define DS_IS_INCONSISTENT(ds) \
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((ds)->ds_phys->ds_flags & DS_FLAG_INCONSISTENT)
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/*
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* NB: nopromote can not yet be set, but we want support for it in this
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* on-disk version, so that we don't need to upgrade for it later. It
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* will be needed when we implement 'zfs split' (where the split off
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* clone should not be promoted).
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*/
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#define DS_FLAG_NOPROMOTE (1ULL<<1)
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/*
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* DS_FLAG_UNIQUE_ACCURATE is set if ds_unique_bytes has been correctly
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* calculated for head datasets (starting with SPA_VERSION_UNIQUE_ACCURATE,
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* refquota/refreservations).
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*/
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#define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)
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/*
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* DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called
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* on a dataset. This allows the dataset to be destroyed using 'zfs release'.
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*/
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#define DS_FLAG_DEFER_DESTROY (1ULL<<3)
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#define DS_IS_DEFER_DESTROY(ds) \
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((ds)->ds_phys->ds_flags & DS_FLAG_DEFER_DESTROY)
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/*
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* DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
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* name lookups should be performed case-insensitively.
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*/
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#define DS_FLAG_CI_DATASET (1ULL<<16)
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typedef struct dsl_dataset_phys {
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uint64_t ds_dir_obj; /* DMU_OT_DSL_DIR */
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uint64_t ds_prev_snap_obj; /* DMU_OT_DSL_DATASET */
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uint64_t ds_prev_snap_txg;
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uint64_t ds_next_snap_obj; /* DMU_OT_DSL_DATASET */
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uint64_t ds_snapnames_zapobj; /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
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uint64_t ds_num_children; /* clone/snap children; ==0 for head */
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uint64_t ds_creation_time; /* seconds since 1970 */
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uint64_t ds_creation_txg;
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uint64_t ds_deadlist_obj; /* DMU_OT_DEADLIST */
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/*
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* ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
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* include all blocks referenced by this dataset, including those
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* shared with any other datasets.
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*/
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uint64_t ds_referenced_bytes;
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uint64_t ds_compressed_bytes;
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uint64_t ds_uncompressed_bytes;
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uint64_t ds_unique_bytes; /* only relevant to snapshots */
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/*
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* The ds_fsid_guid is a 56-bit ID that can change to avoid
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* collisions. The ds_guid is a 64-bit ID that will never
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* change, so there is a small probability that it will collide.
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*/
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uint64_t ds_fsid_guid;
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uint64_t ds_guid;
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uint64_t ds_flags; /* DS_FLAG_* */
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blkptr_t ds_bp;
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uint64_t ds_next_clones_obj; /* DMU_OT_DSL_CLONES */
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uint64_t ds_props_obj; /* DMU_OT_DSL_PROPS for snaps */
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uint64_t ds_userrefs_obj; /* DMU_OT_USERREFS */
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uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
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} dsl_dataset_phys_t;
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typedef struct dsl_dataset {
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/* Immutable: */
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struct dsl_dir *ds_dir;
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dsl_dataset_phys_t *ds_phys;
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dmu_buf_t *ds_dbuf;
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uint64_t ds_object;
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uint64_t ds_fsid_guid;
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/* only used in syncing context, only valid for non-snapshots: */
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struct dsl_dataset *ds_prev;
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/* has internal locking: */
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dsl_deadlist_t ds_deadlist;
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bplist_t ds_pending_deadlist;
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/* to protect against multiple concurrent incremental recv */
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kmutex_t ds_recvlock;
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/* protected by lock on pool's dp_dirty_datasets list */
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txg_node_t ds_dirty_link;
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list_node_t ds_synced_link;
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/*
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* ds_phys->ds_<accounting> is also protected by ds_lock.
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* Protected by ds_lock:
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*/
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kmutex_t ds_lock;
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objset_t *ds_objset;
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uint64_t ds_userrefs;
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/*
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* ds_owner is protected by the ds_rwlock and the ds_lock
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*/
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krwlock_t ds_rwlock;
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kcondvar_t ds_exclusive_cv;
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void *ds_owner;
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/* no locking; only for making guesses */
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uint64_t ds_trysnap_txg;
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/* for objset_open() */
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kmutex_t ds_opening_lock;
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uint64_t ds_reserved; /* cached refreservation */
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uint64_t ds_quota; /* cached refquota */
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kmutex_t ds_sendstream_lock;
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list_t ds_sendstreams;
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/* Protected by ds_lock; keep at end of struct for better locality */
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char ds_snapname[MAXNAMELEN];
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} dsl_dataset_t;
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struct dsl_ds_destroyarg {
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dsl_dataset_t *ds; /* ds to destroy */
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dsl_dataset_t *rm_origin; /* also remove our origin? */
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boolean_t is_origin_rm; /* set if removing origin snap */
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boolean_t defer; /* destroy -d requested? */
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boolean_t releasing; /* destroying due to release? */
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boolean_t need_prep; /* do we need to retry due to EBUSY? */
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};
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/*
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* The max length of a temporary tag prefix is the number of hex digits
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* required to express UINT64_MAX plus one for the hyphen.
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*/
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#define MAX_TAG_PREFIX_LEN 17
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struct dsl_ds_holdarg {
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dsl_sync_task_group_t *dstg;
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char *htag;
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char *snapname;
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boolean_t recursive;
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boolean_t gotone;
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boolean_t temphold;
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char failed[MAXPATHLEN];
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};
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#define dsl_dataset_is_snapshot(ds) \
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((ds)->ds_phys->ds_num_children != 0)
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#define DS_UNIQUE_IS_ACCURATE(ds) \
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(((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
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int dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp);
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int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj,
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void *tag, dsl_dataset_t **);
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int dsl_dataset_own(const char *name, boolean_t inconsistentok,
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void *tag, dsl_dataset_t **dsp);
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int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
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boolean_t inconsistentok, void *tag, dsl_dataset_t **dsp);
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void dsl_dataset_name(dsl_dataset_t *ds, char *name);
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void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
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void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
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void dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag);
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boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok,
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void *tag);
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void dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *tag);
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void dsl_register_onexit_hold_cleanup(dsl_dataset_t *ds, const char *htag,
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minor_t minor);
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uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
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dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
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uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
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uint64_t flags, dmu_tx_t *tx);
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int dsl_dataset_destroy(dsl_dataset_t *ds, void *tag, boolean_t defer);
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int dsl_snapshots_destroy(char *fsname, char *snapname, boolean_t defer);
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dsl_checkfunc_t dsl_dataset_destroy_check;
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dsl_syncfunc_t dsl_dataset_destroy_sync;
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dsl_checkfunc_t dsl_dataset_snapshot_check;
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dsl_syncfunc_t dsl_dataset_snapshot_sync;
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dsl_syncfunc_t dsl_dataset_user_hold_sync;
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int dsl_dataset_rename(char *name, const char *newname, boolean_t recursive);
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int dsl_dataset_promote(const char *name, char *conflsnap);
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int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
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boolean_t force);
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int dsl_dataset_user_hold(char *dsname, char *snapname, char *htag,
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boolean_t recursive, boolean_t temphold, int cleanup_fd);
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int dsl_dataset_user_hold_for_send(dsl_dataset_t *ds, char *htag,
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boolean_t temphold);
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int dsl_dataset_user_release(char *dsname, char *snapname, char *htag,
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boolean_t recursive);
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int dsl_dataset_user_release_tmp(struct dsl_pool *dp, uint64_t dsobj,
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char *htag, boolean_t retry);
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int dsl_dataset_get_holds(const char *dsname, nvlist_t **nvp);
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blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
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void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
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spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
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boolean_t dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds);
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void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);
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void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
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dmu_tx_t *tx);
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int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
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dmu_tx_t *tx, boolean_t async);
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boolean_t dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
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uint64_t blk_birth);
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uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds);
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void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
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void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
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void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
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void dsl_dataset_space(dsl_dataset_t *ds,
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uint64_t *refdbytesp, uint64_t *availbytesp,
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uint64_t *usedobjsp, uint64_t *availobjsp);
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uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
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int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
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uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
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int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
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uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
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boolean_t dsl_dataset_is_dirty(dsl_dataset_t *ds);
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int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
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int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
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uint64_t asize, uint64_t inflight, uint64_t *used,
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uint64_t *ref_rsrv);
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int dsl_dataset_set_quota(const char *dsname, zprop_source_t source,
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uint64_t quota);
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dsl_syncfunc_t dsl_dataset_set_quota_sync;
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int dsl_dataset_set_reservation(const char *dsname, zprop_source_t source,
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uint64_t reservation);
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int dsl_destroy_inconsistent(const char *dsname, void *arg);
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#ifdef ZFS_DEBUG
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#define dprintf_ds(ds, fmt, ...) do { \
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if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
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char *__ds_name = kmem_alloc(MAXNAMELEN, KM_PUSHPAGE); \
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dsl_dataset_name(ds, __ds_name); \
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dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
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kmem_free(__ds_name, MAXNAMELEN); \
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} \
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_NOTE(CONSTCOND) } while (0)
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#else
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#define dprintf_ds(dd, fmt, ...)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_DSL_DATASET_H */
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