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 2009 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #ifndef	_SYS_DSL_DIR_H
27 #define	_SYS_DSL_DIR_H
28 
29 #include <sys/dmu.h>
30 #include <sys/dsl_pool.h>
31 #include <sys/dsl_synctask.h>
32 #include <sys/refcount.h>
33 #include <sys/zfs_context.h>
34 
35 #ifdef	__cplusplus
36 extern "C" {
37 #endif
38 
39 struct dsl_dataset;
40 
41 typedef enum dd_used {
42 	DD_USED_HEAD,
43 	DD_USED_SNAP,
44 	DD_USED_CHILD,
45 	DD_USED_CHILD_RSRV,
46 	DD_USED_REFRSRV,
47 	DD_USED_NUM
48 } dd_used_t;
49 
50 #define	DD_FLAG_USED_BREAKDOWN (1<<0)
51 
52 typedef struct dsl_dir_phys {
53 	uint64_t dd_creation_time; /* not actually used */
54 	uint64_t dd_head_dataset_obj;
55 	uint64_t dd_parent_obj;
56 	uint64_t dd_origin_obj;
57 	uint64_t dd_child_dir_zapobj;
58 	/*
59 	 * how much space our children are accounting for; for leaf
60 	 * datasets, == physical space used by fs + snaps
61 	 */
62 	uint64_t dd_used_bytes;
63 	uint64_t dd_compressed_bytes;
64 	uint64_t dd_uncompressed_bytes;
65 	/* Administrative quota setting */
66 	uint64_t dd_quota;
67 	/* Administrative reservation setting */
68 	uint64_t dd_reserved;
69 	uint64_t dd_props_zapobj;
70 	uint64_t dd_deleg_zapobj; /* dataset delegation permissions */
71 	uint64_t dd_flags;
72 	uint64_t dd_used_breakdown[DD_USED_NUM];
73 	uint64_t dd_pad[14]; /* pad out to 256 bytes for good measure */
74 } dsl_dir_phys_t;
75 
76 struct dsl_dir {
77 	/* These are immutable; no lock needed: */
78 	uint64_t dd_object;
79 	dsl_dir_phys_t *dd_phys;
80 	dmu_buf_t *dd_dbuf;
81 	dsl_pool_t *dd_pool;
82 
83 	/* protected by lock on pool's dp_dirty_dirs list */
84 	txg_node_t dd_dirty_link;
85 
86 	/* protected by dp_config_rwlock */
87 	dsl_dir_t *dd_parent;
88 
89 	/* Protected by dd_lock */
90 	kmutex_t dd_lock;
91 	list_t dd_prop_cbs; /* list of dsl_prop_cb_record_t's */
92 	timestruc_t dd_snap_cmtime; /* last time snapshot namespace changed */
93 
94 	/* gross estimate of space used by in-flight tx's */
95 	uint64_t dd_tempreserved[TXG_SIZE];
96 	/* amount of space we expect to write; == amount of dirty data */
97 	int64_t dd_space_towrite[TXG_SIZE];
98 
99 	/* protected by dd_lock; keep at end of struct for better locality */
100 	char dd_myname[MAXNAMELEN];
101 };
102 
103 void dsl_dir_close(dsl_dir_t *dd, void *tag);
104 int dsl_dir_open(const char *name, void *tag, dsl_dir_t **, const char **tail);
105 int dsl_dir_open_spa(spa_t *spa, const char *name, void *tag, dsl_dir_t **,
106     const char **tailp);
107 int dsl_dir_open_obj(dsl_pool_t *dp, uint64_t ddobj,
108     const char *tail, void *tag, dsl_dir_t **);
109 void dsl_dir_name(dsl_dir_t *dd, char *buf);
110 int dsl_dir_namelen(dsl_dir_t *dd);
111 uint64_t dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds,
112     const char *name, dmu_tx_t *tx);
113 dsl_checkfunc_t dsl_dir_destroy_check;
114 dsl_syncfunc_t dsl_dir_destroy_sync;
115 void dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv);
116 uint64_t dsl_dir_space_available(dsl_dir_t *dd,
117     dsl_dir_t *ancestor, int64_t delta, int ondiskonly);
118 void dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx);
119 void dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx);
120 int dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t mem,
121     uint64_t asize, uint64_t fsize, uint64_t usize, void **tr_cookiep,
122     dmu_tx_t *tx);
123 void dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx);
124 void dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx);
125 void dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
126     int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx);
127 void dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
128     dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
129 int dsl_dir_set_quota(const char *ddname, zprop_source_t source,
130     uint64_t quota);
131 int dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
132     uint64_t reservation);
133 int dsl_dir_rename(dsl_dir_t *dd, const char *newname);
134 int dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd, uint64_t space);
135 int dsl_dir_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx);
136 boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
137 void dsl_dir_new_refreservation(dsl_dir_t *dd, struct dsl_dataset *ds,
138     uint64_t reservation, cred_t *cr, dmu_tx_t *tx);
139 void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);
140 timestruc_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
141 
142 /* internal reserved dir name */
143 #define	MOS_DIR_NAME "$MOS"
144 #define	ORIGIN_DIR_NAME "$ORIGIN"
145 
146 #ifdef ZFS_DEBUG
147 #define	dprintf_dd(dd, fmt, ...) do { \
148 	if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
149 	char *__ds_name = kmem_alloc(MAXNAMELEN + strlen(MOS_DIR_NAME) + 1, \
150 	    KM_SLEEP); \
151 	dsl_dir_name(dd, __ds_name); \
152 	dprintf("dd=%s " fmt, __ds_name, __VA_ARGS__); \
153 	kmem_free(__ds_name, MAXNAMELEN + strlen(MOS_DIR_NAME) + 1); \
154 	} \
155 _NOTE(CONSTCOND) } while (0)
156 #else
157 #define	dprintf_dd(dd, fmt, ...)
158 #endif
159 
160 #ifdef	__cplusplus
161 }
162 #endif
163 
164 #endif /* _SYS_DSL_DIR_H */
165