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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012 by Delphix. All rights reserved.
24 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
25 */
26
27 #ifndef _SYS_DSL_DATASET_H
28 #define _SYS_DSL_DATASET_H
29
30 #include <sys/dmu.h>
31 #include <sys/spa.h>
32 #include <sys/txg.h>
33 #include <sys/zio.h>
34 #include <sys/bplist.h>
35 #include <sys/dsl_synctask.h>
36 #include <sys/zfs_context.h>
37 #include <sys/dsl_deadlist.h>
38 #include <sys/refcount.h>
39
40 #ifdef __cplusplus
41 extern "C" {
42 #endif
43
44 struct dsl_dataset;
45 struct dsl_dir;
46 struct dsl_pool;
47
48 #define DS_FLAG_INCONSISTENT (1ULL<<0)
49 #define DS_IS_INCONSISTENT(ds) \
50 ((ds)->ds_phys->ds_flags & DS_FLAG_INCONSISTENT)
51 /*
52 * Note: nopromote can not yet be set, but we want support for it in this
53 * on-disk version, so that we don't need to upgrade for it later.
54 */
55 #define DS_FLAG_NOPROMOTE (1ULL<<1)
56
57 /*
58 * DS_FLAG_UNIQUE_ACCURATE is set if ds_unique_bytes has been correctly
59 * calculated for head datasets (starting with SPA_VERSION_UNIQUE_ACCURATE,
60 * refquota/refreservations).
61 */
62 #define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)
63
64 /*
65 * DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called
66 * on a dataset. This allows the dataset to be destroyed using 'zfs release'.
67 */
68 #define DS_FLAG_DEFER_DESTROY (1ULL<<3)
69 #define DS_IS_DEFER_DESTROY(ds) \
70 ((ds)->ds_phys->ds_flags & DS_FLAG_DEFER_DESTROY)
71
72 /*
73 * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
74 * name lookups should be performed case-insensitively.
75 */
76 #define DS_FLAG_CI_DATASET (1ULL<<16)
77
78 #define DS_CREATE_FLAG_NODIRTY (1ULL<<24)
79
80 typedef struct dsl_dataset_phys {
81 uint64_t ds_dir_obj; /* DMU_OT_DSL_DIR */
82 uint64_t ds_prev_snap_obj; /* DMU_OT_DSL_DATASET */
83 uint64_t ds_prev_snap_txg;
84 uint64_t ds_next_snap_obj; /* DMU_OT_DSL_DATASET */
85 uint64_t ds_snapnames_zapobj; /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
86 uint64_t ds_num_children; /* clone/snap children; ==0 for head */
87 uint64_t ds_creation_time; /* seconds since 1970 */
88 uint64_t ds_creation_txg;
89 uint64_t ds_deadlist_obj; /* DMU_OT_DEADLIST */
90 /*
91 * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
92 * include all blocks referenced by this dataset, including those
93 * shared with any other datasets.
94 */
95 uint64_t ds_referenced_bytes;
96 uint64_t ds_compressed_bytes;
97 uint64_t ds_uncompressed_bytes;
98 uint64_t ds_unique_bytes; /* only relevant to snapshots */
99 /*
100 * The ds_fsid_guid is a 56-bit ID that can change to avoid
101 * collisions. The ds_guid is a 64-bit ID that will never
102 * change, so there is a small probability that it will collide.
103 */
104 uint64_t ds_fsid_guid;
105 uint64_t ds_guid;
106 uint64_t ds_flags; /* DS_FLAG_* */
107 blkptr_t ds_bp;
108 uint64_t ds_next_clones_obj; /* DMU_OT_DSL_CLONES */
109 uint64_t ds_props_obj; /* DMU_OT_DSL_PROPS for snaps */
110 uint64_t ds_userrefs_obj; /* DMU_OT_USERREFS */
111 uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
112 } dsl_dataset_phys_t;
113
114 typedef struct dsl_dataset {
115 /* Immutable: */
116 struct dsl_dir *ds_dir;
117 dsl_dataset_phys_t *ds_phys;
118 dmu_buf_t *ds_dbuf;
119 uint64_t ds_object;
120 uint64_t ds_fsid_guid;
121
122 /* only used in syncing context, only valid for non-snapshots: */
123 struct dsl_dataset *ds_prev;
124
125 /* has internal locking: */
126 dsl_deadlist_t ds_deadlist;
127 bplist_t ds_pending_deadlist;
128
129 /* protected by lock on pool's dp_dirty_datasets list */
130 txg_node_t ds_dirty_link;
131 list_node_t ds_synced_link;
132
133 /*
134 * ds_phys->ds_<accounting> is also protected by ds_lock.
135 * Protected by ds_lock:
136 */
137 kmutex_t ds_lock;
138 objset_t *ds_objset;
139 uint64_t ds_userrefs;
140 void *ds_owner;
141
142 /*
143 * Long holds prevent the ds from being destroyed; they allow the
144 * ds to remain held even after dropping the dp_config_rwlock.
145 * Owning counts as a long hold. See the comments above
146 * dsl_pool_hold() for details.
147 */
148 refcount_t ds_longholds;
149
150 /* no locking; only for making guesses */
151 uint64_t ds_trysnap_txg;
152
153 /* for objset_open() */
154 kmutex_t ds_opening_lock;
155
156 uint64_t ds_reserved; /* cached refreservation */
157 uint64_t ds_quota; /* cached refquota */
158
159 kmutex_t ds_sendstream_lock;
160 list_t ds_sendstreams;
161
162 /* Protected by ds_lock; keep at end of struct for better locality */
163 char ds_snapname[MAXNAMELEN];
164 } dsl_dataset_t;
165
166 /*
167 * The max length of a temporary tag prefix is the number of hex digits
168 * required to express UINT64_MAX plus one for the hyphen.
169 */
170 #define MAX_TAG_PREFIX_LEN 17
171
172 #define dsl_dataset_is_snapshot(ds) \
173 ((ds)->ds_phys->ds_num_children != 0)
174
175 #define DS_UNIQUE_IS_ACCURATE(ds) \
176 (((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
177
178 int dsl_dataset_hold(struct dsl_pool *dp, const char *name, void *tag,
179 dsl_dataset_t **dsp);
180 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj, void *tag,
181 dsl_dataset_t **);
182 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
183 int dsl_dataset_own(struct dsl_pool *dp, const char *name,
184 void *tag, dsl_dataset_t **dsp);
185 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
186 void *tag, dsl_dataset_t **dsp);
187 void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
188 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
189 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag);
190 void dsl_register_onexit_hold_cleanup(nvlist_t *holds, minor_t minor);
191 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
192 dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
193 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
194 uint64_t flags, dmu_tx_t *tx);
195 int dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors);
196 int dsl_dataset_promote(const char *name, char *conflsnap);
197 int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
198 boolean_t force);
199 int dsl_dataset_rename_snapshot(const char *fsname,
200 const char *oldsnapname, const char *newsnapname, boolean_t recursive);
201 int dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
202 minor_t cleanup_minor, const char *htag);
203
204 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
205 void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
206
207 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
208
209 boolean_t dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds);
210
211 void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);
212
213 void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
214 dmu_tx_t *tx);
215 int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
216 dmu_tx_t *tx, boolean_t async);
217 boolean_t dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
218 uint64_t blk_birth);
219 uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds);
220
221 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
222 void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
223 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
224 void dsl_dataset_space(dsl_dataset_t *ds,
225 uint64_t *refdbytesp, uint64_t *availbytesp,
226 uint64_t *usedobjsp, uint64_t *availobjsp);
227 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
228 int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
229 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
230 int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
231 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
232 boolean_t dsl_dataset_is_dirty(dsl_dataset_t *ds);
233
234 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
235
236 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
237 uint64_t asize, uint64_t inflight, uint64_t *used,
238 uint64_t *ref_rsrv);
239 int dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
240 uint64_t quota);
241 int dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
242 uint64_t reservation);
243
244 boolean_t dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier);
245 void dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag);
246 void dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag);
247 boolean_t dsl_dataset_long_held(dsl_dataset_t *ds);
248
249 int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
250 dsl_dataset_t *origin_head, boolean_t force);
251 void dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
252 dsl_dataset_t *origin_head, dmu_tx_t *tx);
253 int dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
254 dmu_tx_t *tx);
255 void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
256 dmu_tx_t *tx);
257
258 void dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
259 dmu_tx_t *tx);
260 void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds);
261 int dsl_dataset_get_snapname(dsl_dataset_t *ds);
262 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
263 uint64_t *value);
264 int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx);
265 void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
266 zprop_source_t source, uint64_t value, dmu_tx_t *tx);
267 int dsl_dataset_rollback(const char *fsname);
268
269 #ifdef ZFS_DEBUG
270 #define dprintf_ds(ds, fmt, ...) do { \
271 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
272 char *__ds_name = kmem_alloc(MAXNAMELEN, KM_SLEEP); \
273 dsl_dataset_name(ds, __ds_name); \
274 dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
275 kmem_free(__ds_name, MAXNAMELEN); \
276 } \
277 _NOTE(CONSTCOND) } while (0)
278 #else
279 #define dprintf_ds(dd, fmt, ...)
280 #endif
281
282 #ifdef __cplusplus
283 }
284 #endif
285
286 #endif /* _SYS_DSL_DATASET_H */