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FITS: generating send-streams in portable format
This commit adds the command 'zfs fits-send', analogous to zfs send. The
generated send stream is compatible with the stream generated with that
from 'btrfs send' and can in principle easily be received to any filesystem.
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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) 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
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 89 /*
90 90 * ds_referenced_bytes, ds_compressed_bytes, and ds_uncompressed_bytes
91 91 * include all blocks referenced by this dataset, including those
92 92 * shared with any other datasets.
93 93 */
94 94 uint64_t ds_referenced_bytes;
95 95 uint64_t ds_compressed_bytes;
96 96 uint64_t ds_uncompressed_bytes;
97 97 uint64_t ds_unique_bytes; /* only relevant to snapshots */
98 98 /*
99 99 * The ds_fsid_guid is a 56-bit ID that can change to avoid
100 100 * collisions. The ds_guid is a 64-bit ID that will never
101 101 * change, so there is a small probability that it will collide.
102 102 */
103 103 uint64_t ds_fsid_guid;
104 104 uint64_t ds_guid;
105 105 uint64_t ds_flags; /* DS_FLAG_* */
106 106 blkptr_t ds_bp;
107 107 uint64_t ds_next_clones_obj; /* DMU_OT_DSL_CLONES */
108 108 uint64_t ds_props_obj; /* DMU_OT_DSL_PROPS for snaps */
109 109 uint64_t ds_userrefs_obj; /* DMU_OT_USERREFS */
110 110 uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
111 111 } dsl_dataset_phys_t;
112 112
113 113 typedef struct dsl_dataset {
114 114 /* Immutable: */
115 115 struct dsl_dir *ds_dir;
116 116 dsl_dataset_phys_t *ds_phys;
117 117 dmu_buf_t *ds_dbuf;
118 118 uint64_t ds_object;
119 119 uint64_t ds_fsid_guid;
120 120
121 121 /* only used in syncing context, only valid for non-snapshots: */
122 122 struct dsl_dataset *ds_prev;
123 123
124 124 /* has internal locking: */
125 125 dsl_deadlist_t ds_deadlist;
126 126 bplist_t ds_pending_deadlist;
127 127
128 128 /* to protect against multiple concurrent incremental recv */
129 129 kmutex_t ds_recvlock;
130 130
131 131 /* protected by lock on pool's dp_dirty_datasets list */
132 132 txg_node_t ds_dirty_link;
133 133 list_node_t ds_synced_link;
134 134
135 135 /*
136 136 * ds_phys->ds_<accounting> is also protected by ds_lock.
137 137 * Protected by ds_lock:
138 138 */
139 139 kmutex_t ds_lock;
140 140 objset_t *ds_objset;
141 141 uint64_t ds_userrefs;
142 142
143 143 /*
144 144 * ds_owner is protected by the ds_rwlock and the ds_lock
145 145 */
146 146 krwlock_t ds_rwlock;
147 147 kcondvar_t ds_exclusive_cv;
148 148 void *ds_owner;
149 149
150 150 /* no locking; only for making guesses */
151 151 uint64_t ds_trysnap_txg;
152 152
153 153 /* for objset_open() */
154 154 kmutex_t ds_opening_lock;
155 155
156 156 uint64_t ds_reserved; /* cached refreservation */
157 157 uint64_t ds_quota; /* cached refquota */
158 158
159 159 kmutex_t ds_sendstream_lock;
160 160 list_t ds_sendstreams;
161 161
162 162 /* Protected by ds_lock; keep at end of struct for better locality */
163 163 char ds_snapname[MAXNAMELEN];
164 164 } dsl_dataset_t;
165 165
166 166 struct dsl_ds_destroyarg {
167 167 dsl_dataset_t *ds; /* ds to destroy */
168 168 dsl_dataset_t *rm_origin; /* also remove our origin? */
169 169 boolean_t is_origin_rm; /* set if removing origin snap */
170 170 boolean_t defer; /* destroy -d requested? */
171 171 boolean_t releasing; /* destroying due to release? */
172 172 boolean_t need_prep; /* do we need to retry due to EBUSY? */
173 173 };
174 174
175 175 /*
176 176 * The max length of a temporary tag prefix is the number of hex digits
177 177 * required to express UINT64_MAX plus one for the hyphen.
178 178 */
179 179 #define MAX_TAG_PREFIX_LEN 17
180 180
181 181 struct dsl_ds_holdarg {
182 182 dsl_sync_task_group_t *dstg;
183 183 const char *htag;
184 184 char *snapname;
185 185 boolean_t recursive;
186 186 boolean_t gotone;
187 187 boolean_t temphold;
188 188 char failed[MAXPATHLEN];
189 189 };
190 190
191 191 #define dsl_dataset_is_snapshot(ds) \
192 192 ((ds)->ds_phys->ds_num_children != 0)
193 193
194 194 #define DS_UNIQUE_IS_ACCURATE(ds) \
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195 195 (((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
196 196
197 197 int dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp);
198 198 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj,
199 199 void *tag, dsl_dataset_t **);
200 200 int dsl_dataset_own(const char *name, boolean_t inconsistentok,
201 201 void *tag, dsl_dataset_t **dsp);
202 202 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
203 203 boolean_t inconsistentok, void *tag, dsl_dataset_t **dsp);
204 204 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
205 +int dsl_dataset_namelen(dsl_dataset_t *ds);
205 206 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
206 207 void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
207 208 void dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag);
208 209 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok,
209 210 void *tag);
210 211 void dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *tag);
211 212 void dsl_register_onexit_hold_cleanup(dsl_dataset_t *ds, const char *htag,
212 213 minor_t minor);
213 214 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
214 215 dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
215 216 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
216 217 uint64_t flags, dmu_tx_t *tx);
217 218 int dsl_dataset_destroy(dsl_dataset_t *ds, void *tag, boolean_t defer);
218 219 dsl_checkfunc_t dsl_dataset_destroy_check;
219 220 dsl_syncfunc_t dsl_dataset_destroy_sync;
220 221 dsl_syncfunc_t dsl_dataset_user_hold_sync;
221 222 int dsl_dataset_snapshot_check(dsl_dataset_t *ds, const char *, dmu_tx_t *tx);
222 223 void dsl_dataset_snapshot_sync(dsl_dataset_t *ds, const char *, dmu_tx_t *tx);
223 224 int dsl_dataset_rename(char *name, const char *newname, boolean_t recursive);
224 225 int dsl_dataset_promote(const char *name, char *conflsnap);
225 226 int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
226 227 boolean_t force);
227 228 int dsl_dataset_user_hold(char *dsname, char *snapname, char *htag,
228 229 boolean_t recursive, boolean_t temphold, int cleanup_fd);
229 230 int dsl_dataset_user_hold_for_send(dsl_dataset_t *ds, char *htag,
230 231 boolean_t temphold);
231 232 int dsl_dataset_user_release(char *dsname, char *snapname, char *htag,
232 233 boolean_t recursive);
233 234 int dsl_dataset_user_release_tmp(struct dsl_pool *dp, uint64_t dsobj,
234 235 char *htag, boolean_t retry);
235 236 int dsl_dataset_get_holds(const char *dsname, nvlist_t **nvp);
236 237
237 238 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
238 239 void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
239 240
240 241 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
241 242
242 243 boolean_t dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds);
243 244
244 245 void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);
245 246
246 247 void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
247 248 dmu_tx_t *tx);
248 249 int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
249 250 dmu_tx_t *tx, boolean_t async);
250 251 boolean_t dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
251 252 uint64_t blk_birth);
252 253 uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds);
253 254
254 255 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
255 256 void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
256 257 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
257 258 void dsl_dataset_space(dsl_dataset_t *ds,
258 259 uint64_t *refdbytesp, uint64_t *availbytesp,
259 260 uint64_t *usedobjsp, uint64_t *availobjsp);
260 261 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
261 262 int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
262 263 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
263 264 int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
264 265 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
265 266 boolean_t dsl_dataset_is_dirty(dsl_dataset_t *ds);
266 267
267 268 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
268 269
269 270 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
270 271 uint64_t asize, uint64_t inflight, uint64_t *used,
271 272 uint64_t *ref_rsrv);
272 273 int dsl_dataset_set_quota(const char *dsname, zprop_source_t source,
273 274 uint64_t quota);
274 275 dsl_syncfunc_t dsl_dataset_set_quota_sync;
275 276 int dsl_dataset_set_reservation(const char *dsname, zprop_source_t source,
276 277 uint64_t reservation);
277 278
278 279 int dsl_destroy_inconsistent(const char *dsname, void *arg);
279 280
280 281 #ifdef ZFS_DEBUG
281 282 #define dprintf_ds(ds, fmt, ...) do { \
282 283 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
283 284 char *__ds_name = kmem_alloc(MAXNAMELEN, KM_SLEEP); \
284 285 dsl_dataset_name(ds, __ds_name); \
285 286 dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
286 287 kmem_free(__ds_name, MAXNAMELEN); \
287 288 } \
288 289 _NOTE(CONSTCOND) } while (0)
289 290 #else
290 291 #define dprintf_ds(dd, fmt, ...)
291 292 #endif
292 293
293 294 #ifdef __cplusplus
294 295 }
295 296 #endif
296 297
297 298 #endif /* _SYS_DSL_DATASET_H */
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