FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/dmu_traverse.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) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
     * Copyright (c) 2012, 2018 by Delphix. All rights reserved.
     */
    
    #ifndef _SYS_DMU_TRAVERSE_H
    #define _SYS_DMU_TRAVERSE_H
    
    #include <sys/zfs_context.h>
    #include <sys/spa.h>
    #include <sys/zio.h>
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    struct dnode_phys;
    struct dsl_dataset;
    struct zilog;
    struct arc_buf;
    
    typedef int (blkptr_cb_t)(spa_t *spa, zilog_t *zilog, const blkptr_t *bp,
        const zbookmark_phys_t *zb, const struct dnode_phys *dnp, void *arg);
    
    #define TRAVERSE_PRE                    (1<<0)
    #define TRAVERSE_POST                   (1<<1)
    #define TRAVERSE_PREFETCH_METADATA      (1<<2)
    #define TRAVERSE_PREFETCH_DATA          (1<<3)
    #define TRAVERSE_PREFETCH (TRAVERSE_PREFETCH_METADATA | TRAVERSE_PREFETCH_DATA)
    #define TRAVERSE_HARD                   (1<<4)
    
    /*
     * Encrypted dnode blocks have encrypted bonus buffers while the rest
     * of the dnode is left unencrypted. Callers can specify the
     * TRAVERSE_NO_DECRYPT flag to indicate to the traversal code that
     * they wish to receive the raw encrypted dnodes instead of attempting
     * to read the logical data.
     */
    #define TRAVERSE_NO_DECRYPT             (1<<5)
    
    /* Special traverse error return value to indicate skipping of children */
    #define TRAVERSE_VISIT_NO_CHILDREN      -1
    
    int traverse_dataset(struct dsl_dataset *ds,
        uint64_t txg_start, int flags, blkptr_cb_t func, void *arg);
    int traverse_dataset_resume(struct dsl_dataset *ds, uint64_t txg_start,
        zbookmark_phys_t *resume, int flags, blkptr_cb_t func, void *arg);
    int traverse_dataset_destroyed(spa_t *spa, blkptr_t *blkptr,
        uint64_t txg_start, zbookmark_phys_t *resume, int flags,
        blkptr_cb_t func, void *arg);
    int traverse_pool(spa_t *spa,
        uint64_t txg_start, int flags, blkptr_cb_t func, void *arg);
    
    /*
     * Note that this calculation cannot overflow with the current maximum indirect
     * block size (128k).  If that maximum is increased to 1M, however, this
     * calculation can overflow, and handling would need to be added to ensure
     * continued correctness.
     */
    static inline uint64_t
    bp_span_in_blocks(uint8_t indblkshift, uint64_t level)
    {
            unsigned int shift = level * (indblkshift - SPA_BLKPTRSHIFT);
            ASSERT3U(shift, <, 64);
            return (1ULL << shift);
    }
    
    #ifdef  __cplusplus
    }
    #endif
    
    #endif /* _SYS_DMU_TRAVERSE_H */

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