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) 2013 by Delphix. All rights reserved.
24 * Copyright (c) 2014, Joyent, Inc. All rights reserved.
25 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
26 */
27
28 #ifndef _SYS_DSL_DIR_H
29 #define _SYS_DSL_DIR_H
30
31 #include <sys/dmu.h>
32 #include <sys/dsl_pool.h>
33 #include <sys/dsl_synctask.h>
34 #include <sys/refcount.h>
35 #include <sys/zfs_context.h>
36
37 #ifdef __cplusplus
38 extern "C" {
39 #endif
40
41 struct dsl_dataset;
42
43 /*
44 * DD_FIELD_* are strings that are used in the "extensified" dsl_dir zap object.
45 * They should be of the format <reverse-dns>:<field>.
46 */
47
48 #define DD_FIELD_FILESYSTEM_COUNT "com.joyent:filesystem_count"
49 #define DD_FIELD_SNAPSHOT_COUNT "com.joyent:snapshot_count"
50
51 typedef enum dd_used {
52 DD_USED_HEAD,
53 DD_USED_SNAP,
54 DD_USED_CHILD,
55 DD_USED_CHILD_RSRV,
56 DD_USED_REFRSRV,
57 DD_USED_NUM
58 } dd_used_t;
59
60 #define DD_FLAG_USED_BREAKDOWN (1<<0)
61
62 typedef struct dsl_dir_phys {
63 uint64_t dd_creation_time; /* not actually used */
64 uint64_t dd_head_dataset_obj;
65 uint64_t dd_parent_obj;
66 uint64_t dd_origin_obj;
67 uint64_t dd_child_dir_zapobj;
68 /*
69 * how much space our children are accounting for; for leaf
70 * datasets, == physical space used by fs + snaps
71 */
72 uint64_t dd_used_bytes;
73 uint64_t dd_compressed_bytes;
74 uint64_t dd_uncompressed_bytes;
75 /* Administrative quota setting */
76 uint64_t dd_quota;
77 /* Administrative reservation setting */
78 uint64_t dd_reserved;
79 uint64_t dd_props_zapobj;
80 uint64_t dd_deleg_zapobj; /* dataset delegation permissions */
81 uint64_t dd_flags;
82 uint64_t dd_used_breakdown[DD_USED_NUM];
83 uint64_t dd_clones; /* dsl_dir objects */
84 uint64_t dd_pad[13]; /* pad out to 256 bytes for good measure */
85 } dsl_dir_phys_t;
86
87 struct dsl_dir {
88 dmu_buf_user_t dd_dbu;
89
90 /* These are immutable; no lock needed: */
91 uint64_t dd_object;
92 dsl_pool_t *dd_pool;
93
94 /* Stable until user eviction; no lock needed: */
95 dmu_buf_t *dd_dbuf;
96
97 /* protected by lock on pool's dp_dirty_dirs list */
98 txg_node_t dd_dirty_link;
99
100 /* protected by dp_config_rwlock */
101 dsl_dir_t *dd_parent;
102
103 /* Protected by dd_lock */
104 kmutex_t dd_lock;
105 list_t dd_prop_cbs; /* list of dsl_prop_cb_record_t's */
106 timestruc_t dd_snap_cmtime; /* last time snapshot namespace changed */
107 uint64_t dd_origin_txg;
108
109 /* gross estimate of space used by in-flight tx's */
110 uint64_t dd_tempreserved[TXG_SIZE];
111 /* amount of space we expect to write; == amount of dirty data */
112 int64_t dd_space_towrite[TXG_SIZE];
113
114 /* protected by dd_lock; keep at end of struct for better locality */
115 char dd_myname[ZFS_MAX_DATASET_NAME_LEN];
116 };
117
118 inline dsl_dir_phys_t *
dsl_dir_phys(dsl_dir_t * dd)119 dsl_dir_phys(dsl_dir_t *dd)
120 {
121 return (dd->dd_dbuf->db_data);
122 }
123
124 void dsl_dir_rele(dsl_dir_t *dd, void *tag);
125 void dsl_dir_async_rele(dsl_dir_t *dd, void *tag);
126 int dsl_dir_hold(dsl_pool_t *dp, const char *name, void *tag,
127 dsl_dir_t **, const char **tail);
128 int dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj,
129 const char *tail, void *tag, dsl_dir_t **);
130 void dsl_dir_name(dsl_dir_t *dd, char *buf);
131 int dsl_dir_namelen(dsl_dir_t *dd);
132 uint64_t dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds,
133 const char *name, dmu_tx_t *tx);
134 void dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv);
135 uint64_t dsl_dir_space_available(dsl_dir_t *dd,
136 dsl_dir_t *ancestor, int64_t delta, int ondiskonly);
137 void dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx);
138 void dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx);
139 int dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t mem,
140 uint64_t asize, uint64_t fsize, uint64_t usize, void **tr_cookiep,
141 dmu_tx_t *tx);
142 void dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx);
143 void dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx);
144 void dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
145 int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx);
146 void dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
147 dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
148 int dsl_dir_set_quota(const char *ddname, zprop_source_t source,
149 uint64_t quota);
150 int dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
151 uint64_t reservation);
152 int dsl_dir_activate_fs_ss_limit(const char *);
153 int dsl_fs_ss_limit_check(dsl_dir_t *, uint64_t, zfs_prop_t, dsl_dir_t *,
154 cred_t *);
155 void dsl_fs_ss_count_adjust(dsl_dir_t *, int64_t, const char *, dmu_tx_t *);
156 int dsl_dir_rename(const char *oldname, const char *newname);
157 int dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
158 uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t *);
159 boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
160 void dsl_dir_new_refreservation(dsl_dir_t *dd, struct dsl_dataset *ds,
161 uint64_t reservation, cred_t *cr, dmu_tx_t *tx);
162 void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);
163 timestruc_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
164 void dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value,
165 dmu_tx_t *tx);
166 void dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx);
167 boolean_t dsl_dir_is_zapified(dsl_dir_t *dd);
168
169 /* internal reserved dir name */
170 #define MOS_DIR_NAME "$MOS"
171 #define ORIGIN_DIR_NAME "$ORIGIN"
172 #define XLATION_DIR_NAME "$XLATION"
173 #define FREE_DIR_NAME "$FREE"
174 #define LEAK_DIR_NAME "$LEAK"
175
176 #ifdef ZFS_DEBUG
177 #define dprintf_dd(dd, fmt, ...) do { \
178 if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
179 char *__ds_name = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); \
180 dsl_dir_name(dd, __ds_name); \
181 dprintf("dd=%s " fmt, __ds_name, __VA_ARGS__); \
182 kmem_free(__ds_name, ZFS_MAX_DATASET_NAME_LEN); \
183 } \
184 _NOTE(CONSTCOND) } while (0)
185 #else
186 #define dprintf_dd(dd, fmt, ...)
187 #endif
188
189 #ifdef __cplusplus
190 }
191 #endif
192
193 #endif /* _SYS_DSL_DIR_H */
194