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 */
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;
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,
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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_HAS_PHYS(ds) \
49 ((ds)->ds_dbuf != NULL && (ds)->ds_dbuf->db_data != NULL)
50
51 #define DS_FLAG_INCONSISTENT (1ULL<<0)
52 #define DS_IS_INCONSISTENT(ds) \
53 ((ds)->ds_phys->ds_flags & DS_FLAG_INCONSISTENT)
54 /*
55 * Note: nopromote can not yet be set, but we want support for it in this
56 * on-disk version, so that we don't need to upgrade for it later.
57 */
58 #define DS_FLAG_NOPROMOTE (1ULL<<1)
59
60 /*
61 * DS_FLAG_UNIQUE_ACCURATE is set if ds_unique_bytes has been correctly
62 * calculated for head datasets (starting with SPA_VERSION_UNIQUE_ACCURATE,
63 * refquota/refreservations).
64 */
65 #define DS_FLAG_UNIQUE_ACCURATE (1ULL<<2)
66
67 /*
68 * DS_FLAG_DEFER_DESTROY is set after 'zfs destroy -d' has been called
69 * on a dataset. This allows the dataset to be destroyed using 'zfs release'.
70 */
97 */
98 uint64_t ds_referenced_bytes;
99 uint64_t ds_compressed_bytes;
100 uint64_t ds_uncompressed_bytes;
101 uint64_t ds_unique_bytes; /* only relevant to snapshots */
102 /*
103 * The ds_fsid_guid is a 56-bit ID that can change to avoid
104 * collisions. The ds_guid is a 64-bit ID that will never
105 * change, so there is a small probability that it will collide.
106 */
107 uint64_t ds_fsid_guid;
108 uint64_t ds_guid;
109 uint64_t ds_flags; /* DS_FLAG_* */
110 blkptr_t ds_bp;
111 uint64_t ds_next_clones_obj; /* DMU_OT_DSL_CLONES */
112 uint64_t ds_props_obj; /* DMU_OT_DSL_PROPS for snaps */
113 uint64_t ds_userrefs_obj; /* DMU_OT_USERREFS */
114 uint64_t ds_pad[5]; /* pad out to 320 bytes for good measure */
115 } dsl_dataset_phys_t;
116
117 typedef struct dsl_dataset_dbuf {
118 uint8_t dsdb_pad[offsetof(dmu_buf_t, db_data)];
119 dsl_dataset_phys_t *dsdb_data;
120 } dsl_dataset_dbuf_t;
121
122 typedef struct dsl_dataset {
123 dmu_buf_user_t db_evict;
124
125 /* Immutable: */
126 struct dsl_dir *ds_dir;
127 union {
128 dmu_buf_t *ds_dmu_db;
129 dsl_dataset_dbuf_t *ds_db;
130 } ds_db_u;
131 uint64_t ds_object;
132 uint64_t ds_fsid_guid;
133
134 /* only used in syncing context, only valid for non-snapshots: */
135 struct dsl_dataset *ds_prev;
136
137 /* has internal locking: */
138 dsl_deadlist_t ds_deadlist;
139 bplist_t ds_pending_deadlist;
140
141 /* protected by lock on pool's dp_dirty_datasets list */
142 txg_node_t ds_dirty_link;
143 list_node_t ds_synced_link;
144
145 /*
146 * ds_phys->ds_<accounting> is also protected by ds_lock.
147 * Protected by ds_lock:
148 */
149 kmutex_t ds_lock;
150 objset_t *ds_objset;
158 * dsl_pool_hold() for details.
159 */
160 refcount_t ds_longholds;
161
162 /* no locking; only for making guesses */
163 uint64_t ds_trysnap_txg;
164
165 /* for objset_open() */
166 kmutex_t ds_opening_lock;
167
168 uint64_t ds_reserved; /* cached refreservation */
169 uint64_t ds_quota; /* cached refquota */
170
171 kmutex_t ds_sendstream_lock;
172 list_t ds_sendstreams;
173
174 /* Protected by ds_lock; keep at end of struct for better locality */
175 char ds_snapname[MAXNAMELEN];
176 } dsl_dataset_t;
177
178 /* See sys/dmu.h:dmu_buf_user_t for why we have these. */
179 #define ds_dbuf ds_db_u.ds_dmu_db
180 #define ds_phys ds_db_u.ds_db->dsdb_data
181
182 struct dsl_ds_destroyarg {
183 dsl_dataset_t *ds; /* ds to destroy */
184 dsl_dataset_t *rm_origin; /* also remove our origin? */
185 boolean_t is_origin_rm; /* set if removing origin snap */
186 boolean_t defer; /* destroy -d requested? */
187 boolean_t releasing; /* destroying due to release? */
188 boolean_t need_prep; /* do we need to retry due to EBUSY? */
189 };
190
191 /*
192 * The max length of a temporary tag prefix is the number of hex digits
193 * required to express UINT64_MAX plus one for the hyphen.
194 */
195 #define MAX_TAG_PREFIX_LEN 17
196
197 #define dsl_dataset_is_snapshot(ds) \
198 ((ds)->ds_phys->ds_num_children != 0)
199
200 #define DS_UNIQUE_IS_ACCURATE(ds) \
201 (((ds)->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) != 0)
202
203 int dsl_dataset_hold(struct dsl_pool *dp, const char *name, void *tag,
204 dsl_dataset_t **dsp);
205 int dsl_dataset_hold_obj(struct dsl_pool *dp, uint64_t dsobj, void *tag,
206 dsl_dataset_t **);
207 void dsl_dataset_rele(dsl_dataset_t *ds, void *tag);
208 int dsl_dataset_own(struct dsl_pool *dp, const char *name,
209 void *tag, dsl_dataset_t **dsp);
210 int dsl_dataset_own_obj(struct dsl_pool *dp, uint64_t dsobj,
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