kernel/fs/zfs/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  * Copyright (c) 2014 Integros [integros.com]
  27  */
  28
  29 /* Portions Copyright 2010 Robert Milkowski */
  30
  31 #ifndef _SYS_DMU_OBJSET_H
  32 #define _SYS_DMU_OBJSET_H
  33
  34 #include <sys/spa.h>
  35 #include <sys/arc.h>
  36 #include <sys/txg.h>
  37 #include <sys/zfs_context.h>
  38 #include <sys/dnode.h>
  39 #include <sys/zio.h>
  40 #include <sys/zil.h>
  41 #include <sys/sa.h>
  42
  43 #ifdef  __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 extern krwlock_t os_lock;
  48
  49 struct dsl_pool;
  50 struct dsl_dataset;
  51 struct dmu_tx;
  52
  53 #define OBJSET_PHYS_SIZE 2048
  54 #define OBJSET_OLD_PHYS_SIZE 1024
  55
  56 #define OBJSET_BUF_HAS_USERUSED(buf) \
  57         (arc_buf_size(buf) > OBJSET_OLD_PHYS_SIZE)
  58
  59 #define OBJSET_FLAG_USERACCOUNTING_COMPLETE     (1ULL<<0)
  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 struct objset {
  73         /* Immutable: */
  74         struct dsl_dataset *os_dsl_dataset;
  75         spa_t *os_spa;
  76         arc_buf_t *os_phys_buf;
  77         objset_phys_t *os_phys;
  78         /*
  79          * The following "special" dnodes have no parent, are exempt
  80          * from dnode_move(), and are not recorded in os_dnodes, but they
  81          * root their descendents in this objset using handles anyway, so
  82          * that all access to dnodes from dbufs consistently uses handles.
  83          */
  84         dnode_handle_t os_meta_dnode;
  85         dnode_handle_t os_userused_dnode;
  86         dnode_handle_t os_groupused_dnode;
  87         zilog_t *os_zil;
  88
  89         list_node_t os_evicting_node;
  90
  91         /* can change, under dsl_dir's locks: */
  92         enum zio_checksum os_checksum;
  93         enum zio_compress os_compress;
  94         uint8_t os_copies;
  95         enum zio_checksum os_dedup_checksum;
  96         boolean_t os_dedup_verify;
  97         zfs_logbias_op_t os_logbias;
  98         zfs_cache_type_t os_primary_cache;
  99         zfs_cache_type_t os_secondary_cache;
 100         zfs_sync_type_t os_sync;
 101         zfs_redundant_metadata_type_t os_redundant_metadata;
 102         int os_recordsize;
 103
 104         /*
 105          * Pointer is constant; the blkptr it points to is protected by
 106          * os_dsl_dataset->ds_bp_rwlock
 107          */
 108         blkptr_t *os_rootbp;
 109
 110         /* no lock needed: */
 111         struct dmu_tx *os_synctx; /* XXX sketchy */
 112         zil_header_t os_zil_header;
 113         multilist_t *os_synced_dnodes;
 114         uint64_t os_flags;
 115         uint64_t os_freed_dnodes;
 116         boolean_t os_rescan_dnodes;
 117
 118         /* Protected by os_obj_lock */
 119         kmutex_t os_obj_lock;
 120         uint64_t os_obj_next;
 121
 122         /* Protected by os_lock */
 123         kmutex_t os_lock;
 124         multilist_t *os_dirty_dnodes[TXG_SIZE];
 125         list_t os_dnodes;
 126         list_t os_downgraded_dbufs;
 127
 128         /* Protects changes to DMU_{USER,GROUP}USED_OBJECT */
 129         kmutex_t os_userused_lock;
 130
 131         /* stuff we store for the user */
 132         kmutex_t os_user_ptr_lock;
 133         void *os_user_ptr;
 134         sa_os_t *os_sa;
 135 };
 136
 137 #define DMU_META_OBJSET         0
 138 #define DMU_META_DNODE_OBJECT   0
 139 #define DMU_OBJECT_IS_SPECIAL(obj) ((int64_t)(obj) <= 0)
 140 #define DMU_META_DNODE(os)      ((os)->os_meta_dnode.dnh_dnode)
 141 #define DMU_USERUSED_DNODE(os)  ((os)->os_userused_dnode.dnh_dnode)
 142 #define DMU_GROUPUSED_DNODE(os) ((os)->os_groupused_dnode.dnh_dnode)
 143
 144 #define DMU_OS_IS_L2CACHEABLE(os)                               \
 145         ((os)->os_secondary_cache == ZFS_CACHE_ALL ||           \
 146         (os)->os_secondary_cache == ZFS_CACHE_METADATA)
 147
 148 #define DMU_OS_IS_L2COMPRESSIBLE(os)    (zfs_mdcomp_disable == B_FALSE)
 149
 150 /* called from zpl */
 151 int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
 152 int dmu_objset_own(const char *name, dmu_objset_type_t type,
 153     boolean_t readonly, void *tag, objset_t **osp);
 154 int dmu_objset_own_obj(struct dsl_pool *dp, uint64_t obj,
 155     dmu_objset_type_t type, boolean_t readonly, void *tag, objset_t **osp);
 156 void dmu_objset_refresh_ownership(objset_t *os, void *tag);
 157 void dmu_objset_rele(objset_t *os, void *tag);
 158 void dmu_objset_disown(objset_t *os, void *tag);
 159 int dmu_objset_from_ds(struct dsl_dataset *ds, objset_t **osp);
 160
 161 void dmu_objset_stats(objset_t *os, nvlist_t *nv);
 162 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat);
 163 void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
 164     uint64_t *usedobjsp, uint64_t *availobjsp);
 165 uint64_t dmu_objset_fsid_guid(objset_t *os);
 166 int dmu_objset_find_dp(struct dsl_pool *dp, uint64_t ddobj,
 167     int func(struct dsl_pool *, struct dsl_dataset *, void *),
 168     void *arg, int flags);
 169 int dmu_objset_prefetch(const char *name, void *arg);
 170 void dmu_objset_evict_dbufs(objset_t *os);
 171 timestruc_t dmu_objset_snap_cmtime(objset_t *os);
 172
 173 /* called from dsl */
 174 void dmu_objset_sync(objset_t *os, zio_t *zio, dmu_tx_t *tx);
 175 boolean_t dmu_objset_is_dirty(objset_t *os, uint64_t txg);
 176 objset_t *dmu_objset_create_impl(spa_t *spa, struct dsl_dataset *ds,
 177     blkptr_t *bp, dmu_objset_type_t type, dmu_tx_t *tx);
 178 int dmu_objset_open_impl(spa_t *spa, struct dsl_dataset *ds, blkptr_t *bp,
 179     objset_t **osp);
 180 void dmu_objset_evict(objset_t *os);
 181 void dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx);
 182 void dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx);
 183 boolean_t dmu_objset_userused_enabled(objset_t *os);
 184 int dmu_objset_userspace_upgrade(objset_t *os);
 185 boolean_t dmu_objset_userspace_present(objset_t *os);
 186 int dmu_fsname(const char *snapname, char *buf);
 187
 188 void dmu_objset_evict_done(objset_t *os);
 189 void dmu_objset_willuse_space(objset_t *os, int64_t space, dmu_tx_t *tx);
 190
 191 void dmu_objset_init(void);
 192 void dmu_objset_fini(void);
 193
 194 #ifdef  __cplusplus
 195 }
 196 #endif
 197
 198 #endif /* _SYS_DMU_OBJSET_H */