zfs/lib/libzcommon/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 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #ifndef _SYS_DMU_OBJSET_H
  27 #define _SYS_DMU_OBJSET_H
  28
  29 #pragma ident   "@(#)dmu_objset.h       1.13    08/04/27 SMI"
  30
  31 #include <sys/spa.h>
  32 #include <sys/arc.h>
  33 #include <sys/txg.h>
  34 #include <sys/zfs_context.h>
  35 #include <sys/dnode.h>
  36 #include <sys/zio.h>
  37 #include <sys/zil.h>
  38
  39 #ifdef  __cplusplus
  40 extern "C" {
  41 #endif
  42
  43 struct dsl_dataset;
  44 struct dmu_tx;
  45 struct objset_impl;
  46
  47 typedef struct objset_phys {
  48         dnode_phys_t os_meta_dnode;
  49         zil_header_t os_zil_header;
  50         uint64_t os_type;
  51         char os_pad[1024 - sizeof (dnode_phys_t) - sizeof (zil_header_t) -
  52             sizeof (uint64_t)];
  53 } objset_phys_t;
  54
  55 struct objset {
  56         struct objset_impl *os;
  57         int os_mode;
  58 };
  59
  60 typedef struct objset_impl {
  61         /* Immutable: */
  62         struct dsl_dataset *os_dsl_dataset;
  63         spa_t *os_spa;
  64         arc_buf_t *os_phys_buf;
  65         objset_phys_t *os_phys;
  66         dnode_t *os_meta_dnode;
  67         zilog_t *os_zil;
  68         objset_t os;
  69         uint8_t os_checksum;    /* can change, under dsl_dir's locks */
  70         uint8_t os_compress;    /* can change, under dsl_dir's locks */
  71         uint8_t os_copies;      /* can change, under dsl_dir's locks */
  72         uint8_t os_md_checksum;
  73         uint8_t os_md_compress;
  74
  75         /* no lock needed: */
  76         struct dmu_tx *os_synctx; /* XXX sketchy */
  77         blkptr_t *os_rootbp;
  78
  79         /* Protected by os_obj_lock */
  80         kmutex_t os_obj_lock;
  81         uint64_t os_obj_next;
  82
  83         /* Protected by os_lock */
  84         kmutex_t os_lock;
  85         list_t os_dirty_dnodes[TXG_SIZE];
  86         list_t os_free_dnodes[TXG_SIZE];
  87         list_t os_dnodes;
  88         list_t os_downgraded_dbufs;
  89
  90         /* stuff we store for the user */
  91         kmutex_t os_user_ptr_lock;
  92         void *os_user_ptr;
  93 } objset_impl_t;
  94
  95 #define DMU_META_DNODE_OBJECT   0
  96
  97 /* called from zpl */
  98 int dmu_objset_open(const char *name, dmu_objset_type_t type, int mode,
  99     objset_t **osp);
 100 void dmu_objset_close(objset_t *os);
 101 int dmu_objset_create(const char *name, dmu_objset_type_t type,
 102     objset_t *clone_parent, uint64_t flags,
 103     void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg);
 104 int dmu_objset_destroy(const char *name);
 105 int dmu_objset_rollback(objset_t *os);
 106 int dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive);
 107 void dmu_objset_stats(objset_t *os, nvlist_t *nv);
 108 void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat);
 109 void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
 110     uint64_t *usedobjsp, uint64_t *availobjsp);
 111 uint64_t dmu_objset_fsid_guid(objset_t *os);
 112 int dmu_objset_find(char *name, int func(char *, void *), void *arg,
 113     int flags);
 114 void dmu_objset_byteswap(void *buf, size_t size);
 115 int dmu_objset_evict_dbufs(objset_t *os);
 116
 117 /* called from dsl */
 118 void dmu_objset_sync(objset_impl_t *os, zio_t *zio, dmu_tx_t *tx);
 119 objset_impl_t *dmu_objset_create_impl(spa_t *spa, struct dsl_dataset *ds,
 120     blkptr_t *bp, dmu_objset_type_t type, dmu_tx_t *tx);
 121 int dmu_objset_open_impl(spa_t *spa, struct dsl_dataset *ds, blkptr_t *bp,
 122     objset_impl_t **osip);
 123 void dmu_objset_evict(struct dsl_dataset *ds, void *arg);
 124
 125 #ifdef  __cplusplus
 126 }
 127 #endif
 128
 129 #endif /* _SYS_DMU_OBJSET_H */