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      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 2007 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	1.12	07/11/09 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,
    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 */
    130