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.
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.
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]
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #ifndef _SYS_DSL_DATASET_H
27 #define _SYS_DSL_DATASET_H
29 #pragma ident "@(#)dsl_dataset.h 1.16 08/04/27 SMI"
35 #include <sys/bplist.h>
36 #include <sys/dsl_synctask.h>
37 #include <sys/zfs_context.h>
47 typedef void dsl_dataset_evict_func_t(struct dsl_dataset *, void *);
49 #define DS_FLAG_INCONSISTENT (1ULL<<0)
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).
56 #define DS_FLAG_NOPROMOTE (1ULL<<1)
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).
63 #define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)
66 * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
67 * name lookups should be performed case-insensitively.
69 #define DS_FLAG_CI_DATASET (1ULL<<16)
71 typedef struct dsl_dataset_phys {
73 uint64_t ds_prev_snap_obj;
74 uint64_t ds_prev_snap_txg;
75 uint64_t ds_next_snap_obj;
76 uint64_t ds_snapnames_zapobj; /* zap obj of snaps; ==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;
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 */
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.
90 uint64_t ds_fsid_guid;
94 uint64_t ds_pad[8]; /* pad out to 320 bytes for good measure */
97 typedef struct dsl_dataset {
99 struct dsl_dir *ds_dir;
100 dsl_dataset_phys_t *ds_phys;
103 uint64_t ds_fsid_guid;
105 /* only used in syncing context: */
106 struct dsl_dataset *ds_prev; /* only valid for non-snapshots */
108 /* has internal locking: */
109 bplist_t ds_deadlist;
111 /* protected by lock on pool's dp_dirty_datasets list */
112 txg_node_t ds_dirty_link;
113 list_node_t ds_synced_link;
116 * ds_phys->ds_<accounting> is also protected by ds_lock.
117 * Protected by ds_lock:
121 dsl_dataset_evict_func_t *ds_user_evict_func;
122 uint64_t ds_open_refcount;
124 /* no locking; only for making guesses */
125 uint64_t ds_trysnap_txg;
127 /* for objset_open() */
128 kmutex_t ds_opening_lock;
130 uint64_t ds_reserved; /* cached refreservation */
131 uint64_t ds_quota; /* cached refquota */
133 /* Protected by ds_lock; keep at end of struct for better locality */
134 char ds_snapname[MAXNAMELEN];
137 #define dsl_dataset_is_snapshot(ds) \
138 ((ds)->ds_phys->ds_num_children != 0)
140 #define DS_UNIQUE_IS_ACCURATE(ds) \
141 (((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
143 int dsl_dataset_open_spa(spa_t *spa, const char *name, int mode,
144 void *tag, dsl_dataset_t **dsp);
145 int dsl_dataset_open(const char *name, int mode, void *tag,
146 dsl_dataset_t **dsp);
147 int dsl_dataset_open_obj(struct dsl_pool *dp, uint64_t dsobj,
148 const char *tail, int mode, void *tag, dsl_dataset_t **);
149 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
150 void dsl_dataset_close(dsl_dataset_t *ds, int mode, void *tag);
151 void dsl_dataset_downgrade(dsl_dataset_t *ds, int oldmode, int newmode);
152 boolean_t dsl_dataset_tryupgrade(dsl_dataset_t *ds, int oldmode, int newmode);
153 uint64_t dsl_dataset_create_sync_impl(dsl_dir_t *dd, dsl_dataset_t *origin,
154 uint64_t flags, dmu_tx_t *tx);
155 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds,
156 const char *lastname, dsl_dataset_t *origin, uint64_t flags,
157 cred_t *, dmu_tx_t *);
158 int dsl_dataset_destroy(dsl_dataset_t *ds, void *tag);
159 int dsl_snapshots_destroy(char *fsname, char *snapname);
160 dsl_checkfunc_t dsl_dataset_destroy_check;
161 dsl_syncfunc_t dsl_dataset_destroy_sync;
162 dsl_checkfunc_t dsl_dataset_snapshot_check;
163 dsl_syncfunc_t dsl_dataset_snapshot_sync;
164 int dsl_dataset_rollback(dsl_dataset_t *ds, dmu_objset_type_t ost);
165 int dsl_dataset_rename(char *name, const char *newname, boolean_t recursive);
166 int dsl_dataset_promote(const char *name);
167 int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
170 void *dsl_dataset_set_user_ptr(dsl_dataset_t *ds,
171 void *p, dsl_dataset_evict_func_t func);
172 void *dsl_dataset_get_user_ptr(dsl_dataset_t *ds);
174 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
175 void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
177 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
179 boolean_t dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds);
181 void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);
183 void dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
184 void dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio,
186 int dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth);
187 uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds);
189 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
190 void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
191 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
192 void dsl_dataset_space(dsl_dataset_t *ds,
193 uint64_t *refdbytesp, uint64_t *availbytesp,
194 uint64_t *usedobjsp, uint64_t *availobjsp);
195 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
197 void dsl_dataset_create_root(struct dsl_pool *dp, uint64_t *ddobjp,
200 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
202 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
203 uint64_t asize, uint64_t inflight, uint64_t *used,
205 int dsl_dataset_set_quota(const char *dsname, uint64_t quota);
206 void dsl_dataset_set_quota_sync(void *arg1, void *arg2, cred_t *cr,
208 int dsl_dataset_set_reservation(const char *dsname, uint64_t reservation);
209 void dsl_dataset_set_flags(dsl_dataset_t *ds, uint64_t flags);
212 #define dprintf_ds(ds, fmt, ...) do { \
213 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
214 char *__ds_name = kmem_alloc(MAXNAMELEN, KM_SLEEP); \
215 dsl_dataset_name(ds, __ds_name); \
216 dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
217 kmem_free(__ds_name, MAXNAMELEN); \
219 _NOTE(CONSTCOND) } while (0)
221 #define dprintf_ds(dd, fmt, ...)
228 #endif /* _SYS_DSL_DATASET_H */