kernel/fs/zfs/sys/dsl_dir.h

   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, 2016 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 #define DD_FIELD_LAST_REMAP_TXG         "com.delphix:last_remap_txg"
  51
  52 typedef enum dd_used {
  53         DD_USED_HEAD,
  54         DD_USED_SNAP,
  55         DD_USED_CHILD,
  56         DD_USED_CHILD_RSRV,
  57         DD_USED_REFRSRV,
  58         DD_USED_NUM
  59 } dd_used_t;
  60
  61 #define DD_FLAG_USED_BREAKDOWN (1<<0)
  62
  63 typedef struct dsl_dir_phys {
  64         uint64_t dd_creation_time; /* not actually used */
  65         uint64_t dd_head_dataset_obj;
  66         uint64_t dd_parent_obj;
  67         uint64_t dd_origin_obj;
  68         uint64_t dd_child_dir_zapobj;
  69         /*
  70          * how much space our children are accounting for; for leaf
  71          * datasets, == physical space used by fs + snaps
  72          */
  73         uint64_t dd_used_bytes;
  74         uint64_t dd_compressed_bytes;
  75         uint64_t dd_uncompressed_bytes;
  76         /* Administrative quota setting */
  77         uint64_t dd_quota;
  78         /* Administrative reservation setting */
  79         uint64_t dd_reserved;
  80         uint64_t dd_props_zapobj;
  81         uint64_t dd_deleg_zapobj; /* dataset delegation permissions */
  82         uint64_t dd_flags;
  83         uint64_t dd_used_breakdown[DD_USED_NUM];
  84         uint64_t dd_clones; /* dsl_dir objects */
  85         uint64_t dd_pad[13]; /* pad out to 256 bytes for good measure */
  86 } dsl_dir_phys_t;
  87
  88 struct dsl_dir {
  89         dmu_buf_user_t dd_dbu;
  90
  91         /* These are immutable; no lock needed: */
  92         uint64_t dd_object;
  93         dsl_pool_t *dd_pool;
  94
  95         /* Stable until user eviction; no lock needed: */
  96         dmu_buf_t *dd_dbuf;
  97
  98         /* protected by lock on pool's dp_dirty_dirs list */
  99         txg_node_t dd_dirty_link;
 100
 101         /* protected by dp_config_rwlock */
 102         dsl_dir_t *dd_parent;
 103
 104         /* Protected by dd_lock */
 105         kmutex_t dd_lock;
 106         list_t dd_props; /* list of dsl_prop_record_t's */
 107         timestruc_t dd_snap_cmtime; /* last time snapshot namespace changed */
 108         uint64_t dd_origin_txg;
 109
 110         /* gross estimate of space used by in-flight tx's */
 111         uint64_t dd_tempreserved[TXG_SIZE];
 112         /* amount of space we expect to write; == amount of dirty data */
 113         int64_t dd_space_towrite[TXG_SIZE];
 114
 115         /* protected by dd_lock; keep at end of struct for better locality */
 116         char dd_myname[ZFS_MAX_DATASET_NAME_LEN];
 117 };
 118
 119 inline dsl_dir_phys_t *
 120 dsl_dir_phys(dsl_dir_t *dd)
 121 {
 122         return (dd->dd_dbuf->db_data);
 123 }
 124
 125 void dsl_dir_rele(dsl_dir_t *dd, void *tag);
 126 void dsl_dir_async_rele(dsl_dir_t *dd, void *tag);
 127 int dsl_dir_hold(dsl_pool_t *dp, const char *name, void *tag,
 128     dsl_dir_t **, const char **tail);
 129 int dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj,
 130     const char *tail, void *tag, dsl_dir_t **);
 131 void dsl_dir_name(dsl_dir_t *dd, char *buf);
 132 int dsl_dir_namelen(dsl_dir_t *dd);
 133 uint64_t dsl_dir_create_sync(dsl_pool_t *dp, dsl_dir_t *pds,
 134     const char *name, dmu_tx_t *tx);
 135
 136 uint64_t dsl_dir_get_used(dsl_dir_t *dd);
 137 uint64_t dsl_dir_get_quota(dsl_dir_t *dd);
 138 uint64_t dsl_dir_get_reservation(dsl_dir_t *dd);
 139 uint64_t dsl_dir_get_compressratio(dsl_dir_t *dd);
 140 uint64_t dsl_dir_get_logicalused(dsl_dir_t *dd);
 141 uint64_t dsl_dir_get_usedsnap(dsl_dir_t *dd);
 142 uint64_t dsl_dir_get_usedds(dsl_dir_t *dd);
 143 uint64_t dsl_dir_get_usedrefreserv(dsl_dir_t *dd);
 144 uint64_t dsl_dir_get_usedchild(dsl_dir_t *dd);
 145 void dsl_dir_get_origin(dsl_dir_t *dd, char *buf);
 146 int dsl_dir_get_filesystem_count(dsl_dir_t *dd, uint64_t *count);
 147 int dsl_dir_get_snapshot_count(dsl_dir_t *dd, uint64_t *count);
 148 int dsl_dir_get_remaptxg(dsl_dir_t *dd, uint64_t *count);
 149
 150 void dsl_dir_stats(dsl_dir_t *dd, nvlist_t *nv);
 151 uint64_t dsl_dir_space_available(dsl_dir_t *dd,
 152     dsl_dir_t *ancestor, int64_t delta, int ondiskonly);
 153 void dsl_dir_dirty(dsl_dir_t *dd, dmu_tx_t *tx);
 154 void dsl_dir_sync(dsl_dir_t *dd, dmu_tx_t *tx);
 155 int dsl_dir_tempreserve_space(dsl_dir_t *dd, uint64_t mem,
 156     uint64_t asize, boolean_t netfree, void **tr_cookiep, dmu_tx_t *tx);
 157 void dsl_dir_tempreserve_clear(void *tr_cookie, dmu_tx_t *tx);
 158 void dsl_dir_willuse_space(dsl_dir_t *dd, int64_t space, dmu_tx_t *tx);
 159 void dsl_dir_diduse_space(dsl_dir_t *dd, dd_used_t type,
 160     int64_t used, int64_t compressed, int64_t uncompressed, dmu_tx_t *tx);
 161 void dsl_dir_transfer_space(dsl_dir_t *dd, int64_t delta,
 162     dd_used_t oldtype, dd_used_t newtype, dmu_tx_t *tx);
 163 int dsl_dir_set_quota(const char *ddname, zprop_source_t source,
 164     uint64_t quota);
 165 int dsl_dir_set_reservation(const char *ddname, zprop_source_t source,
 166     uint64_t reservation);
 167 int dsl_dir_activate_fs_ss_limit(const char *);
 168 int dsl_fs_ss_limit_check(dsl_dir_t *, uint64_t, zfs_prop_t, dsl_dir_t *,
 169     cred_t *);
 170 void dsl_fs_ss_count_adjust(dsl_dir_t *, int64_t, const char *, dmu_tx_t *);
 171 int dsl_dir_update_last_remap_txg(dsl_dir_t *, uint64_t);
 172 int dsl_dir_rename(const char *oldname, const char *newname);
 173 int dsl_dir_transfer_possible(dsl_dir_t *sdd, dsl_dir_t *tdd,
 174     uint64_t fs_cnt, uint64_t ss_cnt, uint64_t space, cred_t *);
 175 boolean_t dsl_dir_is_clone(dsl_dir_t *dd);
 176 void dsl_dir_new_refreservation(dsl_dir_t *dd, struct dsl_dataset *ds,
 177     uint64_t reservation, cred_t *cr, dmu_tx_t *tx);
 178 void dsl_dir_snap_cmtime_update(dsl_dir_t *dd);
 179 timestruc_t dsl_dir_snap_cmtime(dsl_dir_t *dd);
 180 void dsl_dir_set_reservation_sync_impl(dsl_dir_t *dd, uint64_t value,
 181     dmu_tx_t *tx);
 182 void dsl_dir_zapify(dsl_dir_t *dd, dmu_tx_t *tx);
 183 boolean_t dsl_dir_is_zapified(dsl_dir_t *dd);
 184
 185 /* internal reserved dir name */
 186 #define MOS_DIR_NAME "$MOS"
 187 #define ORIGIN_DIR_NAME "$ORIGIN"
 188 #define FREE_DIR_NAME "$FREE"
 189 #define LEAK_DIR_NAME "$LEAK"
 190
 191 #ifdef ZFS_DEBUG
 192 #define dprintf_dd(dd, fmt, ...) do { \
 193         if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
 194         char *__ds_name = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); \
 195         dsl_dir_name(dd, __ds_name); \
 196         dprintf("dd=%s " fmt, __ds_name, __VA_ARGS__); \
 197         kmem_free(__ds_name, ZFS_MAX_DATASET_NAME_LEN); \
 198         } \
 199 _NOTE(CONSTCOND) } while (0)
 200 #else
 201 #define dprintf_dd(dd, fmt, ...)
 202 #endif
 203
 204 #ifdef  __cplusplus
 205 }
 206 #endif
 207
 208 #endif /* _SYS_DSL_DIR_H */