include/sys/dmu_objset.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, 2017 by Delphix. All rights reserved.
  24  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
  25  * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
  26  */
  27
  28 /* Portions Copyright 2010 Robert Milkowski */
  29
  30 #ifndef _SYS_DMU_OBJSET_H
  31 #define _SYS_DMU_OBJSET_H
  32
  33 #include <sys/spa.h>
  34 #include <sys/arc.h>
  35 #include <sys/txg.h>
  36 #include <sys/zfs_context.h>
  37 #include <sys/dnode.h>
  38 #include <sys/zio.h>
  39 #include <sys/zil.h>
  40 #include <sys/sa.h>
  41
  42 #ifdef  __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 extern krwlock_t os_lock;
  47
  48 struct dsl_pool;
  49 struct dsl_dataset;
  50 struct dmu_tx;
  51
  52 #define OBJSET_PHYS_SIZE 2048
  53 #define OBJSET_OLD_PHYS_SIZE 1024
  54
  55 #define OBJSET_BUF_HAS_USERUSED(buf) \
  56         (arc_buf_size(buf) > OBJSET_OLD_PHYS_SIZE)
  57
  58 #define OBJSET_FLAG_USERACCOUNTING_COMPLETE     (1ULL<<0)
  59 #define OBJSET_FLAG_USEROBJACCOUNTING_COMPLETE  (1ULL<<1)
  60
  61 typedef struct objset_phys {
  62         dnode_phys_t os_meta_dnode;
  63         zil_header_t os_zil_header;
  64         uint64_t os_type;
  65         uint64_t os_flags;
  66         char os_pad[OBJSET_PHYS_SIZE - sizeof (dnode_phys_t)*3 -
  67             sizeof (zil_header_t) - sizeof (uint64_t)*2];
  68         dnode_phys_t os_userused_dnode;
  69         dnode_phys_t os_groupused_dnode;
  70 } objset_phys_t;
  71
  72 typedef int (*dmu_objset_upgrade_cb_t)(objset_t *);
  73
  74 struct objset {
  75         /* Immutable: */
  76         struct dsl_dataset *os_dsl_dataset;
  77         spa_t *os_spa;
  78         arc_buf_t *os_phys_buf;
  79         objset_phys_t *os_phys;
  80         /*
  81          * The following "special" dnodes have no parent, are exempt
  82          * from dnode_move(), and are not recorded in os_dnodes, but they
  83          * root their descendents in this objset using handles anyway, so
  84          * that all access to dnodes from dbufs consistently uses handles.
  85          */
  86         dnode_handle_t os_meta_dnode;
  87         dnode_handle_t os_userused_dnode;
  88         dnode_handle_t os_groupused_dnode;
  89         zilog_t *os_zil;
  90
  91         list_node_t os_evicting_node;
  92
  93         /* can change, under dsl_dir's locks: */
  94         uint64_t os_dnodesize; /* default dnode size for new objects */
  95         enum zio_checksum os_checksum;
  96         enum zio_compress os_compress;
  97         uint8_t os_copies;
  98         enum zio_checksum os_dedup_checksum;
  99         boolean_t os_dedup_verify;
 100         zfs_logbias_op_t os_logbias;
 101         zfs_cache_type_t os_primary_cache;
 102         zfs_cache_type_t os_secondary_cache;
 103         zfs_sync_type_t os_sync;
 104         zfs_redundant_metadata_type_t os_redundant_metadata;
 105         int os_recordsize;
 106
 107         /*
 108          * Pointer is constant; the blkptr it points to is protected by
 109          * os_dsl_dataset->ds_bp_rwlock
 110          */
 111         blkptr_t *os_rootbp;
 112
 113         /* no lock needed: */
 114         struct dmu_tx *os_synctx; /* XXX sketchy */
 115         zil_header_t os_zil_header;
 116         multilist_t *os_synced_dnodes;
 117         uint64_t os_flags;
 118         uint64_t os_freed_dnodes;
 119         boolean_t os_rescan_dnodes;
 120
 121         /* Protected by os_obj_lock */
 122         kmutex_t os_obj_lock;
 123         uint64_t os_obj_next_chunk;
 124
 125         /* Per-CPU next object to allocate, protected by atomic ops. */
 126         uint64_t *os_obj_next_percpu;
 127         int os_obj_next_percpu_len;
 128
 129         /* Protected by os_lock */
 130         kmutex_t os_lock;
 131         multilist_t *os_dirty_dnodes[TXG_SIZE];
 132         list_t os_dnodes;
 133         list_t os_downgraded_dbufs;
 134
 135         /* Protects changes to DMU_{USER,GROUP}USED_OBJECT */
 136         kmutex_t os_userused_lock;
 137
 138         /* stuff we store for the user */
 139         kmutex_t os_user_ptr_lock;
 140         void *os_user_ptr;
 141         sa_os_t *os_sa;
 142
 143         /* kernel thread to upgrade this dataset */
 144         kmutex_t os_upgrade_lock;
 145         taskqid_t os_upgrade_id;
 146         dmu_objset_upgrade_cb_t os_upgrade_cb;
 147         boolean_t os_upgrade_exit;
 148         int os_upgrade_status;
 149 };
 150
 151 #define DMU_META_OBJSET         0
 152 #define DMU_META_DNODE_OBJECT   0
 153 #define DMU_OBJECT_IS_SPECIAL(obj) ((int64_t)(obj) <= 0)
 154 #define DMU_META_DNODE(os)      ((os)->os_meta_dnode.dnh_dnode)
 155 #define DMU_USERUSED_DNODE(os)  ((os)->os_userused_dnode.dnh_dnode)
 156 #define DMU_GROUPUSED_DNODE(os) ((os)->os_groupused_dnode.dnh_dnode)
 157
 158 #define DMU_OS_IS_L2CACHEABLE(os)                               \
 159         ((os)->os_secondary_cache == ZFS_CACHE_ALL ||           \
 160         (os)->os_secondary_cache == ZFS_CACHE_METADATA)
 161
 162 /* called from zpl */
 163 int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
 164 int dmu_objset_own(const char *name, dmu_objset_type_t type,
 165     boolean_t readonly, void *tag, objset_t **osp);
 166 int dmu_objset_own_obj(struct dsl_pool *dp, uint64_t obj,
 167     dmu_objset_type_t type, boolean_t readonly, void *tag, objset_t **osp);
 168 void dmu_objset_refresh_ownership(objset_t *os, void *tag);
 169 void dmu_objset_rele(objset_t *os, void *tag);
 170 void dmu_objset_disown(objset_t *os, void *tag);
 171 int dmu_objset_from_ds(struct dsl_dataset *ds, objset_t **osp);
 172
 173 void dmu_objset_stats(objset_t *os, nvlist_t *nv);
 174 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat);
 175 void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
 176     uint64_t *usedobjsp, uint64_t *availobjsp);
 177 uint64_t dmu_objset_fsid_guid(objset_t *os);
 178 int dmu_objset_find_dp(struct dsl_pool *dp, uint64_t ddobj,
 179     int func(struct dsl_pool *, struct dsl_dataset *, void *),
 180     void *arg, int flags);
 181 void dmu_objset_evict_dbufs(objset_t *os);
 182 timestruc_t dmu_objset_snap_cmtime(objset_t *os);
 183
 184 /* called from dsl */
 185 void dmu_objset_sync(objset_t *os, zio_t *zio, dmu_tx_t *tx);
 186 boolean_t dmu_objset_is_dirty(objset_t *os, uint64_t txg);
 187 objset_t *dmu_objset_create_impl(spa_t *spa, struct dsl_dataset *ds,
 188     blkptr_t *bp, dmu_objset_type_t type, dmu_tx_t *tx);
 189 int dmu_objset_open_impl(spa_t *spa, struct dsl_dataset *ds, blkptr_t *bp,
 190     objset_t **osp);
 191 void dmu_objset_evict(objset_t *os);
 192 void dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx);
 193 void dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx);
 194 boolean_t dmu_objset_userused_enabled(objset_t *os);
 195 int dmu_objset_userspace_upgrade(objset_t *os);
 196 boolean_t dmu_objset_userspace_present(objset_t *os);
 197 boolean_t dmu_objset_userobjused_enabled(objset_t *os);
 198 boolean_t dmu_objset_userobjspace_upgradable(objset_t *os);
 199 void dmu_objset_userobjspace_upgrade(objset_t *os);
 200 boolean_t dmu_objset_userobjspace_present(objset_t *os);
 201
 202 int dmu_fsname(const char *snapname, char *buf);
 203
 204 void dmu_objset_evict_done(objset_t *os);
 205 void dmu_objset_willuse_space(objset_t *os, int64_t space, dmu_tx_t *tx);
 206
 207 void dmu_objset_init(void);
 208 void dmu_objset_fini(void);
 209
 210 #ifdef  __cplusplus
 211 }
 212 #endif
 213
 214 #endif /* _SYS_DMU_OBJSET_H */