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2619 asynchronous destruction of ZFS file systems
2747 SPA versioning with zfs feature flags
Reviewed by: Matt Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <gwilson@delphix.com>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Reviewed by: Dan Kruchinin <dan.kruchinin@gmail.com>
Approved by: Dan McDonald <danmcd@nexenta.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 *
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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 - * Copyright (c) 2011 by Delphix. All rights reserved.
23 + * Copyright (c) 2012 by Delphix. All rights reserved.
24 24 * Copyright (c) 2012, Joyent, Inc. All rights reserved.
25 25 */
26 26
27 27 #ifndef _SYS_DSL_DATASET_H
28 28 #define _SYS_DSL_DATASET_H
29 29
30 30 #include <sys/dmu.h>
31 31 #include <sys/spa.h>
32 32 #include <sys/txg.h>
33 33 #include <sys/zio.h>
34 34 #include <sys/bplist.h>
35 35 #include <sys/dsl_synctask.h>
36 36 #include <sys/zfs_context.h>
37 37 #include <sys/dsl_deadlist.h>
38 38
39 39 #ifdef __cplusplus
40 40 extern "C" {
41 41 #endif
42 42
43 43 struct dsl_dataset;
44 44 struct dsl_dir;
45 45 struct dsl_pool;
46 46
47 47 #define DS_FLAG_INCONSISTENT (1ULL<<0)
48 48 #define DS_IS_INCONSISTENT(ds) \
49 49 ((ds)->ds_phys->ds_flags & DS_FLAG_INCONSISTENT)
50 50 /*
51 51 * NB: nopromote can not yet be set, but we want support for it in this
52 52 * on-disk version, so that we don't need to upgrade for it later. It
53 53 * will be needed when we implement 'zfs split' (where the split off
54 54 * clone should not be promoted).
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
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79 79 typedef struct dsl_dataset_phys {
80 80 uint64_t ds_dir_obj; /* DMU_OT_DSL_DIR */
81 81 uint64_t ds_prev_snap_obj; /* DMU_OT_DSL_DATASET */
82 82 uint64_t ds_prev_snap_txg;
83 83 uint64_t ds_next_snap_obj; /* DMU_OT_DSL_DATASET */
84 84 uint64_t ds_snapnames_zapobj; /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
85 85 uint64_t ds_num_children; /* clone/snap children; ==0 for head */
86 86 uint64_t ds_creation_time; /* seconds since 1970 */
87 87 uint64_t ds_creation_txg;
88 88 uint64_t ds_deadlist_obj; /* DMU_OT_DEADLIST */
89 - uint64_t ds_used_bytes;
89 + /*
90 + * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
91 + * include all blocks referenced by this dataset, including those
92 + * shared with any other datasets.
93 + */
94 + uint64_t ds_referenced_bytes;
90 95 uint64_t ds_compressed_bytes;
91 96 uint64_t ds_uncompressed_bytes;
92 97 uint64_t ds_unique_bytes; /* only relevant to snapshots */
93 98 /*
94 99 * The ds_fsid_guid is a 56-bit ID that can change to avoid
95 100 * collisions. The ds_guid is a 64-bit ID that will never
96 101 * change, so there is a small probability that it will collide.
97 102 */
98 103 uint64_t ds_fsid_guid;
99 104 uint64_t ds_guid;
100 105 uint64_t ds_flags; /* DS_FLAG_* */
101 106 blkptr_t ds_bp;
102 107 uint64_t ds_next_clones_obj; /* DMU_OT_DSL_CLONES */
103 108 uint64_t ds_props_obj; /* DMU_OT_DSL_PROPS for snaps */
104 109 uint64_t ds_userrefs_obj; /* DMU_OT_USERREFS */
105 110 uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
106 111 } dsl_dataset_phys_t;
107 112
108 113 typedef struct dsl_dataset {
109 114 /* Immutable: */
110 115 struct dsl_dir *ds_dir;
111 116 dsl_dataset_phys_t *ds_phys;
112 117 dmu_buf_t *ds_dbuf;
113 118 uint64_t ds_object;
114 119 uint64_t ds_fsid_guid;
115 120
116 121 /* only used in syncing context, only valid for non-snapshots: */
117 122 struct dsl_dataset *ds_prev;
118 123
119 124 /* has internal locking: */
120 125 dsl_deadlist_t ds_deadlist;
121 126 bplist_t ds_pending_deadlist;
122 127
123 128 /* to protect against multiple concurrent incremental recv */
124 129 kmutex_t ds_recvlock;
125 130
126 131 /* protected by lock on pool's dp_dirty_datasets list */
127 132 txg_node_t ds_dirty_link;
128 133 list_node_t ds_synced_link;
129 134
130 135 /*
131 136 * ds_phys->ds_<accounting> is also protected by ds_lock.
132 137 * Protected by ds_lock:
133 138 */
134 139 kmutex_t ds_lock;
135 140 objset_t *ds_objset;
136 141 uint64_t ds_userrefs;
137 142
138 143 /*
139 144 * ds_owner is protected by the ds_rwlock and the ds_lock
140 145 */
141 146 krwlock_t ds_rwlock;
142 147 kcondvar_t ds_exclusive_cv;
143 148 void *ds_owner;
144 149
145 150 /* no locking; only for making guesses */
146 151 uint64_t ds_trysnap_txg;
147 152
148 153 /* for objset_open() */
149 154 kmutex_t ds_opening_lock;
150 155
151 156 uint64_t ds_reserved; /* cached refreservation */
152 157 uint64_t ds_quota; /* cached refquota */
153 158
154 159 kmutex_t ds_sendstream_lock;
155 160 list_t ds_sendstreams;
156 161
157 162 /* Protected by ds_lock; keep at end of struct for better locality */
158 163 char ds_snapname[MAXNAMELEN];
159 164 } dsl_dataset_t;
160 165
161 166 struct dsl_ds_destroyarg {
162 167 dsl_dataset_t *ds; /* ds to destroy */
163 168 dsl_dataset_t *rm_origin; /* also remove our origin? */
164 169 boolean_t is_origin_rm; /* set if removing origin snap */
165 170 boolean_t defer; /* destroy -d requested? */
166 171 boolean_t releasing; /* destroying due to release? */
167 172 boolean_t need_prep; /* do we need to retry due to EBUSY? */
168 173 };
169 174
170 175 /*
171 176 * The max length of a temporary tag prefix is the number of hex digits
172 177 * required to express UINT64_MAX plus one for the hyphen.
173 178 */
174 179 #define MAX_TAG_PREFIX_LEN 17
175 180
176 181 struct dsl_ds_holdarg {
177 182 dsl_sync_task_group_t *dstg;
178 183 char *htag;
179 184 char *snapname;
180 185 boolean_t recursive;
181 186 boolean_t gotone;
182 187 boolean_t temphold;
183 188 char failed[MAXPATHLEN];
184 189 };
185 190
186 191 #define dsl_dataset_is_snapshot(ds) \
187 192 ((ds)->ds_phys->ds_num_children != 0)
188 193
189 194 #define DS_UNIQUE_IS_ACCURATE(ds) \
190 195 (((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
191 196
192 197 int dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp);
193 198 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj,
194 199 void *tag, dsl_dataset_t **);
195 200 int dsl_dataset_own(const char *name, boolean_t inconsistentok,
196 201 void *tag, dsl_dataset_t **dsp);
197 202 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
198 203 boolean_t inconsistentok, void *tag, dsl_dataset_t **dsp);
199 204 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
200 205 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
201 206 void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
202 207 void dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag);
203 208 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok,
204 209 void *tag);
205 210 void dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *tag);
206 211 void dsl_register_onexit_hold_cleanup(dsl_dataset_t *ds, const char *htag,
207 212 minor_t minor);
208 213 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
209 214 dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
210 215 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
211 216 uint64_t flags, dmu_tx_t *tx);
212 217 int dsl_dataset_destroy(dsl_dataset_t *ds, void *tag, boolean_t defer);
213 218 int dsl_snapshots_destroy(char *fsname, char *snapname, boolean_t defer);
214 219 dsl_checkfunc_t dsl_dataset_destroy_check;
215 220 dsl_syncfunc_t dsl_dataset_destroy_sync;
216 221 dsl_checkfunc_t dsl_dataset_snapshot_check;
217 222 dsl_syncfunc_t dsl_dataset_snapshot_sync;
218 223 dsl_syncfunc_t dsl_dataset_user_hold_sync;
219 224 int dsl_dataset_rename(char *name, const char *newname, boolean_t recursive);
220 225 int dsl_dataset_promote(const char *name, char *conflsnap);
221 226 int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
222 227 boolean_t force);
223 228 int dsl_dataset_user_hold(char *dsname, char *snapname, char *htag,
224 229 boolean_t recursive, boolean_t temphold, int cleanup_fd);
225 230 int dsl_dataset_user_hold_for_send(dsl_dataset_t *ds, char *htag,
226 231 boolean_t temphold);
227 232 int dsl_dataset_user_release(char *dsname, char *snapname, char *htag,
228 233 boolean_t recursive);
229 234 int dsl_dataset_user_release_tmp(struct dsl_pool *dp, uint64_t dsobj,
230 235 char *htag, boolean_t retry);
231 236 int dsl_dataset_get_holds(const char *dsname, nvlist_t **nvp);
232 237
233 238 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
234 239 void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
235 240
236 241 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
237 242
238 243 boolean_t dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds);
239 244
240 245 void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);
241 246
242 247 void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
243 248 dmu_tx_t *tx);
244 249 int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
245 250 dmu_tx_t *tx, boolean_t async);
246 251 boolean_t dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
247 252 uint64_t blk_birth);
248 253 uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds);
249 254
250 255 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
251 256 void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
252 257 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
253 258 void dsl_dataset_space(dsl_dataset_t *ds,
254 259 uint64_t *refdbytesp, uint64_t *availbytesp,
255 260 uint64_t *usedobjsp, uint64_t *availobjsp);
256 261 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
257 262 int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
258 263 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
259 264 int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
260 265 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
261 266
262 267 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
263 268
264 269 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
265 270 uint64_t asize, uint64_t inflight, uint64_t *used,
266 271 uint64_t *ref_rsrv);
267 272 int dsl_dataset_set_quota(const char *dsname, zprop_source_t source,
268 273 uint64_t quota);
269 274 dsl_syncfunc_t dsl_dataset_set_quota_sync;
270 275 int dsl_dataset_set_reservation(const char *dsname, zprop_source_t source,
271 276 uint64_t reservation);
272 277
273 278 int dsl_destroy_inconsistent(const char *dsname, void *arg);
274 279
275 280 #ifdef ZFS_DEBUG
276 281 #define dprintf_ds(ds, fmt, ...) do { \
277 282 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
278 283 char *__ds_name = kmem_alloc(MAXNAMELEN, KM_SLEEP); \
279 284 dsl_dataset_name(ds, __ds_name); \
280 285 dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
281 286 kmem_free(__ds_name, MAXNAMELEN); \
282 287 } \
283 288 _NOTE(CONSTCOND) } while (0)
284 289 #else
285 290 #define dprintf_ds(dd, fmt, ...)
286 291 #endif
287 292
288 293 #ifdef __cplusplus
289 294 }
290 295 #endif
291 296
292 297 #endif /* _SYS_DSL_DATASET_H */
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