sys/dmu_objset.h

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/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/* Portions Copyright 2010 Robert Milkowski */

#ifndef _SYS_DMU_OBJSET_H
#define _SYS_DMU_OBJSET_H

#include <sys/spa.h>
#include <sys/arc.h>
#include <sys/txg.h>
#include <sys/zfs_context.h>
#include <sys/dnode.h>
#include <sys/zio.h>
#include <sys/zil.h>
#include <sys/sa.h>

#ifdef  __cplusplus
extern "C" {
#endif

extern krwlock_t os_lock;

struct dsl_dataset;
struct dmu_tx;

#define OBJSET_PHYS_SIZE 2048
#define OBJSET_OLD_PHYS_SIZE 1024

#define OBJSET_BUF_HAS_USERUSED(buf) \
        (arc_buf_size(buf) > OBJSET_OLD_PHYS_SIZE)

#define OBJSET_FLAG_USERACCOUNTING_COMPLETE     (1ULL<<0)

typedef struct objset_phys {
        dnode_phys_t os_meta_dnode;
        zil_header_t os_zil_header;
        uint64_t os_type;
        uint64_t os_flags;
        char os_pad[OBJSET_PHYS_SIZE - sizeof (dnode_phys_t)*3 -
            sizeof (zil_header_t) - sizeof (uint64_t)*2];
        dnode_phys_t os_userused_dnode;
        dnode_phys_t os_groupused_dnode;
} objset_phys_t;

struct objset {
        struct dsl_dataset *os_dsl_dataset;
        spa_t *os_spa;
        arc_buf_t *os_phys_buf;
        objset_phys_t *os_phys;
        /*
         * The following "special" dnodes have no parent and are exempt from
         * dnode_move(), but they root their descendents in this objset using
         * handles anyway, so that all access to dnodes from dbufs consistently
         * uses handles.
         */
        dnode_handle_t os_meta_dnode;
        dnode_handle_t os_userused_dnode;
        dnode_handle_t os_groupused_dnode;
        zilog_t *os_zil;

        uint8_t os_checksum;
        uint8_t os_compress;
        uint8_t os_copies;
        uint8_t os_dedup_checksum;
        uint8_t os_dedup_verify;
        uint8_t os_logbias;
        uint8_t os_primary_cache;
        uint8_t os_secondary_cache;
        uint8_t os_sync;

        struct dmu_tx *os_synctx; 
        blkptr_t *os_rootbp;
        zil_header_t os_zil_header;
        list_t os_synced_dnodes;
        uint64_t os_flags;

        kmutex_t os_obj_lock;
        uint64_t os_obj_next;

        kmutex_t os_lock;
        list_t os_dirty_dnodes[TXG_SIZE];
        list_t os_free_dnodes[TXG_SIZE];
        list_t os_dnodes;
        list_t os_downgraded_dbufs;

        kmutex_t os_user_ptr_lock;
        void *os_user_ptr;

        sa_os_t *os_sa;
};

#define DMU_META_OBJSET         0
#define DMU_META_DNODE_OBJECT   0
#define DMU_OBJECT_IS_SPECIAL(obj) ((int64_t)(obj) <= 0)
#define DMU_META_DNODE(os)      ((os)->os_meta_dnode.dnh_dnode)
#define DMU_USERUSED_DNODE(os)  ((os)->os_userused_dnode.dnh_dnode)
#define DMU_GROUPUSED_DNODE(os) ((os)->os_groupused_dnode.dnh_dnode)

#define DMU_OS_IS_L2CACHEABLE(os)                               \
        ((os)->os_secondary_cache == ZFS_CACHE_ALL ||           \
        (os)->os_secondary_cache == ZFS_CACHE_METADATA)

/* called from zpl */
int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
int dmu_objset_own(const char *name, dmu_objset_type_t type,
    boolean_t readonly, void *tag, objset_t **osp);
void dmu_objset_rele(objset_t *os, void *tag);
void dmu_objset_disown(objset_t *os, void *tag);
int dmu_objset_from_ds(struct dsl_dataset *ds, objset_t **osp);

int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
    void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg);
int dmu_objset_clone(const char *name, struct dsl_dataset *clone_origin,
    uint64_t flags);
int dmu_objset_destroy(const char *name, boolean_t defer);
int dmu_objset_snapshot(char *fsname, char *snapname, char *tag,
    struct nvlist *props, boolean_t recursive, boolean_t temporary, int fd);
void dmu_objset_stats(objset_t *os, nvlist_t *nv);
void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat);
void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
    uint64_t *usedobjsp, uint64_t *availobjsp);
uint64_t dmu_objset_fsid_guid(objset_t *os);
int dmu_objset_find(const char *name, int func(const char *, void *), void *arg,
    int flags);
int dmu_objset_find_spa(spa_t *spa, const char *name,
    int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags);
int dmu_objset_prefetch(const char *name, void *arg);
void dmu_objset_byteswap(void *buf, size_t size);
int dmu_objset_evict_dbufs(objset_t *os);
timestruc_t dmu_objset_snap_cmtime(objset_t *os);

/* called from dsl */
void dmu_objset_sync(objset_t *os, zio_t *zio, dmu_tx_t *tx);
boolean_t dmu_objset_is_dirty(objset_t *os, uint64_t txg);
objset_t *dmu_objset_create_impl(spa_t *spa, struct dsl_dataset *ds,
    blkptr_t *bp, dmu_objset_type_t type, dmu_tx_t *tx);
int dmu_objset_open_impl(spa_t *spa, struct dsl_dataset *ds, blkptr_t *bp,
    objset_t **osp);
void dmu_objset_evict(objset_t *os);
void dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx);
void dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx);
boolean_t dmu_objset_userused_enabled(objset_t *os);
int dmu_objset_userspace_upgrade(objset_t *os);
boolean_t dmu_objset_userspace_present(objset_t *os);

void dmu_objset_init(void);
void dmu_objset_fini(void);

#ifdef  __cplusplus
}
#endif

#endif /* _SYS_DMU_OBJSET_H */