FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/bpobj.h

     /*
      * 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 https://opensource.org/licenses/CDDL-1.0.
     * 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) 2010, Oracle and/or its affiliates. All rights reserved.
     * Copyright (c) 2015, 2019 by Delphix. All rights reserved.
     */
    
    #ifndef _SYS_BPOBJ_H
    #define _SYS_BPOBJ_H
    
    #include <sys/dmu.h>
    #include <sys/spa.h>
    #include <sys/txg.h>
    #include <sys/zio.h>
    #include <sys/zfs_context.h>
    #include <sys/bplist.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    typedef struct bpobj_phys {
            /*
             * This is the bonus buffer for the dead lists.  The object's
             * contents is an array of bpo_entries blkptr_t's, representing
             * a total of bpo_bytes physical space.
             */
            uint64_t        bpo_num_blkptrs;
            uint64_t        bpo_bytes;
            uint64_t        bpo_comp;
            uint64_t        bpo_uncomp;
            uint64_t        bpo_subobjs;
            uint64_t        bpo_num_subobjs;
            uint64_t        bpo_num_freed;
    } bpobj_phys_t;
    
    #define BPOBJ_SIZE_V0   (2 * sizeof (uint64_t))
    #define BPOBJ_SIZE_V1   (4 * sizeof (uint64_t))
    #define BPOBJ_SIZE_V2   (6 * sizeof (uint64_t))
    
    typedef struct bpobj {
            kmutex_t        bpo_lock;
            objset_t        *bpo_os;
            uint64_t        bpo_object;
            int             bpo_epb;
            uint8_t         bpo_havecomp;
            uint8_t         bpo_havesubobj;
            uint8_t         bpo_havefreed;
            bpobj_phys_t    *bpo_phys;
            dmu_buf_t       *bpo_dbuf;
            dmu_buf_t       *bpo_cached_dbuf;
    } bpobj_t;
    
    typedef int bpobj_itor_t(void *arg, const blkptr_t *bp, boolean_t bp_freed,
        dmu_tx_t *tx);
    
    uint64_t bpobj_alloc(objset_t *mos, int blocksize, dmu_tx_t *tx);
    uint64_t bpobj_alloc_empty(objset_t *os, int blocksize, dmu_tx_t *tx);
    void bpobj_free(objset_t *os, uint64_t obj, dmu_tx_t *tx);
    void bpobj_decr_empty(objset_t *os, dmu_tx_t *tx);
    
    int bpobj_open(bpobj_t *bpo, objset_t *mos, uint64_t object);
    void bpobj_close(bpobj_t *bpo);
    boolean_t bpobj_is_open(const bpobj_t *bpo);
    
    int bpobj_iterate(bpobj_t *bpo, bpobj_itor_t func, void *arg, dmu_tx_t *tx);
    int bpobj_iterate_nofree(bpobj_t *bpo, bpobj_itor_t func, void *, uint64_t *);
    int livelist_bpobj_iterate_from_nofree(bpobj_t *bpo, bpobj_itor_t func,
        void *arg, int64_t start);
    
    void bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx);
    void bpobj_enqueue(bpobj_t *bpo, const blkptr_t *bp, boolean_t bp_freed,
        dmu_tx_t *tx);
    
    int bpobj_space(bpobj_t *bpo,
        uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
    int bpobj_space_range(bpobj_t *bpo, uint64_t mintxg, uint64_t maxtxg,
        uint64_t *usedp, uint64_t *compp, uint64_t *uncompp);
    boolean_t bpobj_is_empty(bpobj_t *bpo);
    
    int bplist_append_cb(void *arg, const blkptr_t *bp, boolean_t bp_freed,
       dmu_tx_t *tx);
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif /* _SYS_BPOBJ_H */

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