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, Joyent, Inc. All rights reserved.
  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_clones; /* dsl_dir objects */
  74 
  75         uint64_t dd_filesystem_count;
  76         uint64_t dd_snapshot_count;
  77 
  78         uint64_t dd_pad[11]; /* pad out to 256 bytes for good measure */
  79 } dsl_dir_phys_t;
  80 
  81 struct dsl_dir {
  82         /* These are immutable; no lock needed: */
  83         uint64_t dd_object;
  84         dsl_dir_phys_t *dd_phys;
  85         dmu_buf_t *dd_dbuf;
  86         dsl_pool_t *dd_pool;
  87 
  88         /* protected by lock on pool's dp_dirty_dirs list */
  89         txg_node_t dd_dirty_link;
  90 
  91         /* protected by dp_config_rwlock */
  92         dsl_dir_t *dd_parent;
  93 
  94         /* Protected by dd_lock */
  95         kmutex_t dd_lock;
  96         list_t dd_prop_cbs; /* list of dsl_prop_cb_record_t's */
  97         timestruc_t dd_snap_cmtime; /* last time snapshot namespace changed */
  98         uint64_t dd_origin_txg;
  99 
 100         /* gross estimate of space used by in-flight tx's */
 101         uint64_t dd_tempreserved[TXG_SIZE];
 102         /* amount of space we expect to write; == amount of dirty data */
 103         int64_t dd_space_towrite[TXG_SIZE];
 104 
 105         /* protected by dd_lock; keep at end of struct for better locality */
 106         char dd_myname[MAXNAMELEN];
 107 };
 108 
 109 void dsl_dir_close(dsl_dir_t *dd, void *tag);
 110 int dsl_dir_open(const char *name, void *tag, dsl_dir_t **, const char **tail);
 111 int dsl_dir_open_spa(spa_t *spa, const char *name, void *tag, dsl_dir_t **,
 112     const char **tailp);
 113 int dsl_dir_open_obj(dsl_pool_t *dp, uint64_t ddobj,
 114     const char *tail, void *tag, dsl_dir_t **);
 115 void dsl_dir_name(dsl_dir_t *dd, char *buf);
 116 int dsl_dir_namelen(dsl_dir_t *dd);
 117 uint64_t dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds,
 118     const char *name, dmu_tx_t *tx);
 119 dsl_checkfunc_t dsl_dir_destroy_check;
 120 dsl_syncfunc_t dsl_dir_destroy_sync;
 121 void dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv);
 122 uint64_t dsl_dir_space_available(dsl_dir_t *dd,
 123     dsl_dir_t *ancestor, int64_t delta, int ondiskonly);
 124 void dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx);
 125 void dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx);
 126 int dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t mem,
 127     uint64_t asize, uint64_t fsize, uint64_t usize, void **tr_cookiep,
 128     dmu_tx_t *tx);
 129 void dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx);
 130 void dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx);
 131 void dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
 132     int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx);
 133 void dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
 134     dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
 135 int dsl_dir_set_quota(const char *ddname, zprop_source_t source,
 136     uint64_t quota);
 137 int dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
 138     uint64_t reservation);
 139 int dsl_dir_validate_fs_ss_limit(const char *, uint64_t, zfs_prop_t);
 140 int dsl_dir_fscount_check(dsl_dir_t *, uint64_t, dsl_dir_t *);
 141 void dsl_dir_fscount_adjust(dsl_dir_t *, dmu_tx_t *, int64_t, boolean_t,
 142     boolean_t);
 143 int dsl_snapcount_check(dsl_dir_t *, uint64_t, dsl_dir_t *);
 144 void dsl_snapcount_adjust(dsl_dir_t *, dmu_tx_t *, int64_t, boolean_t);
 145 int dsl_dir_rename(dsl_dir_t *dd, const char *newname);
 146 int dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
 147     dsl_dir_t *moving_dd, uint64_t space, dmu_tx_t *tx);
 148 int dsl_dir_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx);
 149 boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
 150 void dsl_dir_new_refreservation(dsl_dir_t *dd, struct dsl_dataset *ds,
 151     uint64_t reservation, cred_t *cr, dmu_tx_t *tx);
 152 void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);
 153 timestruc_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
 154 
 155 /* internal reserved dir name */
 156 #define MOS_DIR_NAME "$MOS"
 157 #define ORIGIN_DIR_NAME "$ORIGIN"
 158 #define XLATION_DIR_NAME "$XLATION"
 159 #define FREE_DIR_NAME "$FREE"
 160 
 161 #ifdef ZFS_DEBUG
 162 #define dprintf_dd(dd, fmt, ...) do { \
 163         if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
 164         char *__ds_name = kmem_alloc(MAXNAMELEN + strlen(MOS_DIR_NAME) + 1, \
 165             KM_SLEEP); \
 166         dsl_dir_name(dd, __ds_name); \
 167         dprintf("dd=%s " fmt, __ds_name, __VA_ARGS__); \
 168         kmem_free(__ds_name, MAXNAMELEN + strlen(MOS_DIR_NAME) + 1); \
 169         } \
 170 _NOTE(CONSTCOND) } while (0)
 171 #else
 172 #define dprintf_dd(dd, fmt, ...)
 173 #endif
 174 
 175 #ifdef  __cplusplus
 176 }
 177 #endif
 178 
 179 #endif /* _SYS_DSL_DIR_H */