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3996 want a libzfs_core API to rollback to latest snapshot
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
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--- old/usr/src/uts/common/fs/zfs/sys/dsl_dataset.h
+++ new/usr/src/uts/common/fs/zfs/sys/dsl_dataset.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright (c) 2013 by Delphix. All rights reserved.
24 24 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
25 25 * Copyright (c) 2013 Steven Hartland. All rights reserved.
26 26 */
27 27
28 28 #ifndef _SYS_DSL_DATASET_H
29 29 #define _SYS_DSL_DATASET_H
30 30
31 31 #include <sys/dmu.h>
32 32 #include <sys/spa.h>
33 33 #include <sys/txg.h>
34 34 #include <sys/zio.h>
35 35 #include <sys/bplist.h>
36 36 #include <sys/dsl_synctask.h>
37 37 #include <sys/zfs_context.h>
38 38 #include <sys/dsl_deadlist.h>
39 39 #include <sys/refcount.h>
40 40
41 41 #ifdef __cplusplus
42 42 extern "C" {
43 43 #endif
44 44
45 45 struct dsl_dataset;
46 46 struct dsl_dir;
47 47 struct dsl_pool;
48 48
49 49 #define DS_FLAG_INCONSISTENT (1ULL<<0)
50 50 #define DS_IS_INCONSISTENT(ds) \
51 51 ((ds)->ds_phys->ds_flags & DS_FLAG_INCONSISTENT)
52 52 /*
53 53 * Note: nopromote can not yet be set, but we want support for it in this
54 54 * on-disk version, so that we don't need to upgrade for it later.
55 55 */
56 56 #define DS_FLAG_NOPROMOTE (1ULL<<1)
57 57
58 58 /*
59 59 * DS_FLAG_UNIQUE_ACCURATE is set if ds_unique_bytes has been correctly
60 60 * calculated for head datasets (starting with SPA_VERSION_UNIQUE_ACCURATE,
61 61 * refquota/refreservations).
62 62 */
63 63 #define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)
64 64
65 65 /*
66 66 * DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called
67 67 * on a dataset. This allows the dataset to be destroyed using 'zfs release'.
68 68 */
69 69 #define DS_FLAG_DEFER_DESTROY (1ULL<<3)
70 70 #define DS_IS_DEFER_DESTROY(ds) \
71 71 ((ds)->ds_phys->ds_flags & DS_FLAG_DEFER_DESTROY)
72 72
73 73 /*
74 74 * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
75 75 * name lookups should be performed case-insensitively.
76 76 */
77 77 #define DS_FLAG_CI_DATASET (1ULL<<16)
78 78
79 79 #define DS_CREATE_FLAG_NODIRTY (1ULL<<24)
80 80
81 81 typedef struct dsl_dataset_phys {
82 82 uint64_t ds_dir_obj; /* DMU_OT_DSL_DIR */
83 83 uint64_t ds_prev_snap_obj; /* DMU_OT_DSL_DATASET */
84 84 uint64_t ds_prev_snap_txg;
85 85 uint64_t ds_next_snap_obj; /* DMU_OT_DSL_DATASET */
86 86 uint64_t ds_snapnames_zapobj; /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
87 87 uint64_t ds_num_children; /* clone/snap children; ==0 for head */
88 88 uint64_t ds_creation_time; /* seconds since 1970 */
89 89 uint64_t ds_creation_txg;
90 90 uint64_t ds_deadlist_obj; /* DMU_OT_DEADLIST */
91 91 /*
92 92 * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
93 93 * include all blocks referenced by this dataset, including those
94 94 * shared with any other datasets.
95 95 */
96 96 uint64_t ds_referenced_bytes;
97 97 uint64_t ds_compressed_bytes;
98 98 uint64_t ds_uncompressed_bytes;
99 99 uint64_t ds_unique_bytes; /* only relevant to snapshots */
100 100 /*
101 101 * The ds_fsid_guid is a 56-bit ID that can change to avoid
102 102 * collisions. The ds_guid is a 64-bit ID that will never
103 103 * change, so there is a small probability that it will collide.
104 104 */
105 105 uint64_t ds_fsid_guid;
106 106 uint64_t ds_guid;
107 107 uint64_t ds_flags; /* DS_FLAG_* */
108 108 blkptr_t ds_bp;
109 109 uint64_t ds_next_clones_obj; /* DMU_OT_DSL_CLONES */
110 110 uint64_t ds_props_obj; /* DMU_OT_DSL_PROPS for snaps */
111 111 uint64_t ds_userrefs_obj; /* DMU_OT_USERREFS */
112 112 uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
113 113 } dsl_dataset_phys_t;
114 114
115 115 typedef struct dsl_dataset {
116 116 /* Immutable: */
117 117 struct dsl_dir *ds_dir;
118 118 dsl_dataset_phys_t *ds_phys;
119 119 dmu_buf_t *ds_dbuf;
120 120 uint64_t ds_object;
121 121 uint64_t ds_fsid_guid;
122 122
123 123 /* only used in syncing context, only valid for non-snapshots: */
124 124 struct dsl_dataset *ds_prev;
125 125
126 126 /* has internal locking: */
127 127 dsl_deadlist_t ds_deadlist;
128 128 bplist_t ds_pending_deadlist;
129 129
130 130 /* protected by lock on pool's dp_dirty_datasets list */
131 131 txg_node_t ds_dirty_link;
132 132 list_node_t ds_synced_link;
133 133
134 134 /*
135 135 * ds_phys->ds_<accounting> is also protected by ds_lock.
136 136 * Protected by ds_lock:
137 137 */
138 138 kmutex_t ds_lock;
139 139 objset_t *ds_objset;
140 140 uint64_t ds_userrefs;
141 141 void *ds_owner;
142 142
143 143 /*
144 144 * Long holds prevent the ds from being destroyed; they allow the
145 145 * ds to remain held even after dropping the dp_config_rwlock.
146 146 * Owning counts as a long hold. See the comments above
147 147 * dsl_pool_hold() for details.
148 148 */
149 149 refcount_t ds_longholds;
150 150
151 151 /* no locking; only for making guesses */
152 152 uint64_t ds_trysnap_txg;
153 153
154 154 /* for objset_open() */
155 155 kmutex_t ds_opening_lock;
156 156
157 157 uint64_t ds_reserved; /* cached refreservation */
158 158 uint64_t ds_quota; /* cached refquota */
159 159
160 160 kmutex_t ds_sendstream_lock;
161 161 list_t ds_sendstreams;
162 162
163 163 /* Protected by ds_lock; keep at end of struct for better locality */
164 164 char ds_snapname[MAXNAMELEN];
165 165 } dsl_dataset_t;
166 166
167 167 /*
168 168 * The max length of a temporary tag prefix is the number of hex digits
169 169 * required to express UINT64_MAX plus one for the hyphen.
170 170 */
171 171 #define MAX_TAG_PREFIX_LEN 17
172 172
173 173 #define dsl_dataset_is_snapshot(ds) \
174 174 ((ds)->ds_phys->ds_num_children != 0)
175 175
176 176 #define DS_UNIQUE_IS_ACCURATE(ds) \
177 177 (((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
178 178
179 179 int dsl_dataset_hold(struct dsl_pool *dp, const char *name, void *tag,
180 180 dsl_dataset_t **dsp);
181 181 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj, void *tag,
182 182 dsl_dataset_t **);
183 183 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
184 184 int dsl_dataset_own(struct dsl_pool *dp, const char *name,
185 185 void *tag, dsl_dataset_t **dsp);
186 186 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
187 187 void *tag, dsl_dataset_t **dsp);
188 188 void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
189 189 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
190 190 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, void *tag);
191 191 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
192 192 dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
193 193 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
194 194 uint64_t flags, dmu_tx_t *tx);
195 195 int dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors);
196 196 int dsl_dataset_promote(const char *name, char *conflsnap);
197 197 int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
198 198 boolean_t force);
199 199 int dsl_dataset_rename_snapshot(const char *fsname,
200 200 const char *oldsnapname, const char *newsnapname, boolean_t recursive);
201 201 int dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname,
202 202 minor_t cleanup_minor, const char *htag);
203 203
204 204 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
205 205 void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
206 206
207 207 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
208 208
209 209 boolean_t dsl_dataset_modified_since_snap(dsl_dataset_t *ds,
210 210 dsl_dataset_t *snap);
211 211
212 212 void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);
213 213
214 214 void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
215 215 dmu_tx_t *tx);
216 216 int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
217 217 dmu_tx_t *tx, boolean_t async);
218 218 boolean_t dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
219 219 uint64_t blk_birth);
220 220 uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds);
221 221
222 222 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
223 223 void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
224 224 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
225 225 void dsl_dataset_space(dsl_dataset_t *ds,
226 226 uint64_t *refdbytesp, uint64_t *availbytesp,
227 227 uint64_t *usedobjsp, uint64_t *availobjsp);
228 228 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
229 229 int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
230 230 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
231 231 int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
232 232 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
233 233 boolean_t dsl_dataset_is_dirty(dsl_dataset_t *ds);
234 234
235 235 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
236 236
237 237 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
238 238 uint64_t asize, uint64_t inflight, uint64_t *used,
239 239 uint64_t *ref_rsrv);
240 240 int dsl_dataset_set_refquota(const char *dsname, zprop_source_t source,
241 241 uint64_t quota);
242 242 int dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source,
243 243 uint64_t reservation);
244 244
245 245 boolean_t dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier);
246 246 void dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag);
247 247 void dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag);
248 248 boolean_t dsl_dataset_long_held(dsl_dataset_t *ds);
249 249
250 250 int dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone,
251 251 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx);
252 252 void dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone,
253 253 dsl_dataset_t *origin_head, dmu_tx_t *tx);
254 254 int dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname,
255 255 dmu_tx_t *tx, boolean_t recv);
256 256 void dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname,
257 257 dmu_tx_t *tx);
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258 258
259 259 void dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj,
260 260 dmu_tx_t *tx);
261 261 void dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds);
262 262 int dsl_dataset_get_snapname(dsl_dataset_t *ds);
263 263 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
264 264 uint64_t *value);
265 265 int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx);
266 266 void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
267 267 zprop_source_t source, uint64_t value, dmu_tx_t *tx);
268 -int dsl_dataset_rollback(const char *fsname, void *owner);
268 +int dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result);
269 269
270 270 #ifdef ZFS_DEBUG
271 271 #define dprintf_ds(ds, fmt, ...) do { \
272 272 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
273 273 char *__ds_name = kmem_alloc(MAXNAMELEN, KM_SLEEP); \
274 274 dsl_dataset_name(ds, __ds_name); \
275 275 dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
276 276 kmem_free(__ds_name, MAXNAMELEN); \
277 277 } \
278 278 _NOTE(CONSTCOND) } while (0)
279 279 #else
280 280 #define dprintf_ds(dd, fmt, ...)
281 281 #endif
282 282
283 283 #ifdef __cplusplus
284 284 }
285 285 #endif
286 286
287 287 #endif /* _SYS_DSL_DATASET_H */
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