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
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42
43 struct dsl_dataset;
44 struct dsl_dir;
45 struct dsl_pool;
46
47 #define DS_FLAG_INCONSISTENT (1ULL<<0)
48 #define DS_IS_INCONSISTENT(ds) \
49 ((ds)->ds_phys->ds_flags & DS_FLAG_INCONSISTENT)
50 /*
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).
55 */
56 #define DS_FLAG_NOPROMOTE (1ULL<<1)
57
58 /*
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).
62 */
63 #define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)
64
65 /*
66 * DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called
67 * on a dataset. This allows the dataset to be destroyed using 'zfs release'.
68 */
69 #define DS_FLAG_DEFER_DESTROY (1ULL<<3)
70 #define DS_IS_DEFER_DESTROY(ds) \
71 ((ds)->ds_phys->ds_flags & DS_FLAG_DEFER_DESTROY)
72
73 /*
74 * DS_FLAG_CI_DATASET is set if the dataset contains a file system whose
75 * name lookups should be performed case-insensitively.
76 */
77 #define DS_FLAG_CI_DATASET (1ULL<<16)
78
79 typedef struct dsl_dataset_phys {
80 uint64_t ds_dir_obj; /* DMU_OT_DSL_DIR */
81 uint64_t ds_prev_snap_obj; /* DMU_OT_DSL_DATASET */
82 uint64_t ds_prev_snap_txg;
83 uint64_t ds_next_snap_obj; /* DMU_OT_DSL_DATASET */
84 uint64_t ds_snapnames_zapobj; /* DMU_OT_DSL_DS_SNAP_MAP 0 for snaps */
85 uint64_t ds_num_children; /* clone/snap children; ==0 for head */
86 uint64_t ds_creation_time; /* seconds since 1970 */
87 uint64_t ds_creation_txg;
88 uint64_t ds_deadlist_obj; /* DMU_OT_DEADLIST */
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;
95 uint64_t ds_compressed_bytes;
96 uint64_t ds_uncompressed_bytes;
97 uint64_t ds_unique_bytes; /* only relevant to snapshots */
98 /*
99 * The ds_fsid_guid is a 56-bit ID that can change to avoid
100 * collisions. The ds_guid is a 64-bit ID that will never
101 * change, so there is a small probability that it will collide.
102 */
103 uint64_t ds_fsid_guid;
104 uint64_t ds_guid;
105 uint64_t ds_flags; /* DS_FLAG_* */
106 blkptr_t ds_bp;
107 uint64_t ds_next_clones_obj; /* DMU_OT_DSL_CLONES */
108 uint64_t ds_props_obj; /* DMU_OT_DSL_PROPS for snaps */
109 uint64_t ds_userrefs_obj; /* DMU_OT_USERREFS */
110 uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
111 } dsl_dataset_phys_t;
112
113 typedef struct dsl_dataset {
114 /* Immutable: */
115 struct dsl_dir *ds_dir;
116 dsl_dataset_phys_t *ds_phys;
117 dmu_buf_t *ds_dbuf;
118 uint64_t ds_object;
119 uint64_t ds_fsid_guid;
120
121 /* only used in syncing context, only valid for non-snapshots: */
122 struct dsl_dataset *ds_prev;
123
124 /* has internal locking: */
125 dsl_deadlist_t ds_deadlist;
126 bplist_t ds_pending_deadlist;
127
128 /* protected by lock on pool's dp_dirty_datasets list */
129 txg_node_t ds_dirty_link;
130 list_node_t ds_synced_link;
131
132 /*
133 * ds_phys->ds_<accounting> is also protected by ds_lock.
134 * Protected by ds_lock:
135 */
136 kmutex_t ds_lock;
137 objset_t *ds_objset;
138 uint64_t ds_userrefs;
139
140 /*
141 * ds_owner is protected by the ds_rwlock and the ds_lock
142 */
143 krwlock_t ds_rwlock;
144 kcondvar_t ds_exclusive_cv;
145 void *ds_owner;
146
147 /* no locking; only for making guesses */
148 uint64_t ds_trysnap_txg;
149
150 /* for objset_open() */
151 kmutex_t ds_opening_lock;
152
153 uint64_t ds_reserved; /* cached refreservation */
154 uint64_t ds_quota; /* cached refquota */
155
156 kmutex_t ds_sendstream_lock;
157 list_t ds_sendstreams;
158
159 /* Protected by ds_lock; keep at end of struct for better locality */
160 char ds_snapname[MAXNAMELEN];
161 } dsl_dataset_t;
162
163 struct dsl_ds_destroyarg {
164 dsl_dataset_t *ds; /* ds to destroy */
165 dsl_dataset_t *rm_origin; /* also remove our origin? */
166 boolean_t is_origin_rm; /* set if removing origin snap */
167 boolean_t defer; /* destroy -d requested? */
168 boolean_t releasing; /* destroying due to release? */
169 boolean_t need_prep; /* do we need to retry due to EBUSY? */
170 };
171
172 /*
173 * The max length of a temporary tag prefix is the number of hex digits
174 * required to express UINT64_MAX plus one for the hyphen.
175 */
176 #define MAX_TAG_PREFIX_LEN 17
177
178 struct dsl_ds_holdarg {
179 dsl_sync_task_group_t *dstg;
180 char *htag;
181 char *snapname;
182 boolean_t recursive;
183 boolean_t gotone;
184 boolean_t temphold;
185 char failed[MAXPATHLEN];
186 };
187
188 #define dsl_dataset_is_snapshot(ds) \
189 ((ds)->ds_phys->ds_num_children != 0)
190
191 #define DS_UNIQUE_IS_ACCURATE(ds) \
192 (((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
193
194 int dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp);
195 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj,
196 void *tag, dsl_dataset_t **);
197 int dsl_dataset_own(const char *name, boolean_t inconsistentok,
198 void *tag, dsl_dataset_t **dsp);
199 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
200 boolean_t inconsistentok, void *tag, dsl_dataset_t **dsp);
201 void dsl_dataset_name(dsl_dataset_t *ds, char *name);
202 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
203 void dsl_dataset_disown(dsl_dataset_t *ds, void *tag);
204 void dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag);
205 boolean_t dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok,
206 void *tag);
207 void dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *tag);
208 void dsl_register_onexit_hold_cleanup(dsl_dataset_t *ds, const char *htag,
209 minor_t minor);
210 uint64_t dsl_dataset_create_sync(dsl_dir_t *pds, const char *lastname,
211 dsl_dataset_t *origin, uint64_t flags, cred_t *, dmu_tx_t *);
212 uint64_t dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin,
213 uint64_t flags, dmu_tx_t *tx);
214 int dsl_dataset_destroy(dsl_dataset_t *ds, void *tag, boolean_t defer);
215 int dsl_snapshots_destroy(char *fsname, char *snapname, boolean_t defer);
216 dsl_checkfunc_t dsl_dataset_destroy_check;
217 dsl_syncfunc_t dsl_dataset_destroy_sync;
218 dsl_checkfunc_t dsl_dataset_snapshot_check;
219 dsl_syncfunc_t dsl_dataset_snapshot_sync;
220 dsl_syncfunc_t dsl_dataset_user_hold_sync;
221 int dsl_dataset_rename(char *name, const char *newname, boolean_t recursive);
222 int dsl_dataset_promote(const char *name, char *conflsnap);
223 int dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head,
224 boolean_t force);
225 int dsl_dataset_user_hold(char *dsname, char *snapname, char *htag,
226 boolean_t recursive, boolean_t temphold, int cleanup_fd);
227 int dsl_dataset_user_hold_for_send(dsl_dataset_t *ds, char *htag,
228 boolean_t temphold);
229 int dsl_dataset_user_release(char *dsname, char *snapname, char *htag,
230 boolean_t recursive);
231 int dsl_dataset_user_release_tmp(struct dsl_pool *dp, uint64_t dsobj,
232 char *htag, boolean_t retry);
233 int dsl_dataset_get_holds(const char *dsname, nvlist_t **nvp);
234
235 blkptr_t *dsl_dataset_get_blkptr(dsl_dataset_t *ds);
236 void dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx);
237
238 spa_t *dsl_dataset_get_spa(dsl_dataset_t *ds);
239
240 boolean_t dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds);
241
242 void dsl_dataset_sync(dsl_dataset_t *os, zio_t *zio, dmu_tx_t *tx);
243
244 void dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp,
245 dmu_tx_t *tx);
246 int dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp,
247 dmu_tx_t *tx, boolean_t async);
248 boolean_t dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp,
249 uint64_t blk_birth);
250 uint64_t dsl_dataset_prev_snap_txg(dsl_dataset_t *ds);
251
252 void dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx);
253 void dsl_dataset_stats(dsl_dataset_t *os, nvlist_t *nv);
254 void dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat);
255 void dsl_dataset_space(dsl_dataset_t *ds,
256 uint64_t *refdbytesp, uint64_t *availbytesp,
257 uint64_t *usedobjsp, uint64_t *availobjsp);
258 uint64_t dsl_dataset_fsid_guid(dsl_dataset_t *ds);
259 int dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new,
260 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
261 int dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, dsl_dataset_t *last,
262 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
263
264 int dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf);
265
266 int dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota,
267 uint64_t asize, uint64_t inflight, uint64_t *used,
268 uint64_t *ref_rsrv);
269 int dsl_dataset_set_quota(const char *dsname, zprop_source_t source,
270 uint64_t quota);
271 dsl_syncfunc_t dsl_dataset_set_quota_sync;
272 int dsl_dataset_set_reservation(const char *dsname, zprop_source_t source,
273 uint64_t reservation);
274
275 int dsl_destroy_inconsistent(const char *dsname, void *arg);
276
277 #ifdef ZFS_DEBUG
278 #define dprintf_ds(ds, fmt, ...) do { \
279 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
280 char *__ds_name = kmem_alloc(MAXNAMELEN, KM_SLEEP); \
281 dsl_dataset_name(ds, __ds_name); \
282 dprintf("ds=%s " fmt, __ds_name, __VA_ARGS__); \
283 kmem_free(__ds_name, MAXNAMELEN); \
284 } \
285 _NOTE(CONSTCOND) } while (0)
286 #else
287 #define dprintf_ds(dd, fmt, ...)
288 #endif
289
290 #ifdef __cplusplus
291 }
292 #endif
293
294 #endif /* _SYS_DSL_DATASET_H */