FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/abd_impl.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) 2014 by Chunwei Chen. All rights reserved.
     * Copyright (c) 2016, 2019 by Delphix. All rights reserved.
     */
    
    #ifndef _ABD_IMPL_H
    #define _ABD_IMPL_H
    
    #include <sys/abd.h>
    #include <sys/wmsum.h>
    
    #ifdef __cplusplus
    extern "C" {
    #endif
    
    typedef enum abd_stats_op {
            ABDSTAT_INCR, /* Increase abdstat values */
            ABDSTAT_DECR  /* Decrease abdstat values */
    } abd_stats_op_t;
    
    struct scatterlist; /* forward declaration */
    
    struct abd_iter {
            /* public interface */
            void            *iter_mapaddr;  /* addr corresponding to iter_pos */
            size_t          iter_mapsize;   /* length of data valid at mapaddr */
    
            /* private */
            abd_t           *iter_abd;      /* ABD being iterated through */
            size_t          iter_pos;
            size_t          iter_offset;    /* offset in current sg/abd_buf, */
                                            /* abd_offset included */
            struct scatterlist *iter_sg;    /* current sg */
    };
    
    extern abd_t *abd_zero_scatter;
    
    abd_t *abd_gang_get_offset(abd_t *, size_t *);
    abd_t *abd_alloc_struct(size_t);
    void abd_free_struct(abd_t *);
    
    /*
     * OS specific functions
     */
    
    abd_t *abd_alloc_struct_impl(size_t);
    abd_t *abd_get_offset_scatter(abd_t *, abd_t *, size_t, size_t);
    void abd_free_struct_impl(abd_t *);
    void abd_alloc_chunks(abd_t *, size_t);
    void abd_free_chunks(abd_t *);
    void abd_update_scatter_stats(abd_t *, abd_stats_op_t);
    void abd_update_linear_stats(abd_t *, abd_stats_op_t);
    void abd_verify_scatter(abd_t *);
    void abd_free_linear_page(abd_t *);
    /* OS specific abd_iter functions */
    void abd_iter_init(struct abd_iter  *, abd_t *);
    boolean_t abd_iter_at_end(struct abd_iter *);
    void abd_iter_advance(struct abd_iter *, size_t);
    void abd_iter_map(struct abd_iter *);
    void abd_iter_unmap(struct abd_iter *);
    
    /*
     * Helper macros
     */
    #define ABDSTAT_INCR(stat, val) \
            wmsum_add(&abd_sums.stat, (val))
    #define ABDSTAT_BUMP(stat)      ABDSTAT_INCR(stat, 1)
    #define ABDSTAT_BUMPDOWN(stat)  ABDSTAT_INCR(stat, -1)
    
    #define ABD_SCATTER(abd)        (abd->abd_u.abd_scatter)
    #define ABD_LINEAR_BUF(abd)     (abd->abd_u.abd_linear.abd_buf)
    #define ABD_GANG(abd)           (abd->abd_u.abd_gang)
    
    #if defined(_KERNEL)
    #if defined(__FreeBSD__)
    #define abd_enter_critical(flags)       critical_enter()
    #define abd_exit_critical(flags)        critical_exit()
    #else
    #define abd_enter_critical(flags)       local_irq_save(flags)
   #define abd_exit_critical(flags)        local_irq_restore(flags)
   #endif
   #else /* !_KERNEL */
   #define abd_enter_critical(flags)       ((void)0)
   #define abd_exit_critical(flags)        ((void)0)
   #endif
   
   #ifdef __cplusplus
   }
   #endif
   
   #endif  /* _ABD_IMPL_H */

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