151 lines
4.4 KiB
C
151 lines
4.4 KiB
C
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2014 by Chunwei Chen. All rights reserved.
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* Copyright (c) 2016, 2019 by Delphix. All rights reserved.
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*/
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#ifndef _ABD_IMPL_H
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#define _ABD_IMPL_H
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#include <sys/abd.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef enum abd_flags {
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ABD_FLAG_LINEAR = 1 << 0, /* is buffer linear (or scattered)? */
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ABD_FLAG_OWNER = 1 << 1, /* does it own its data buffers? */
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ABD_FLAG_META = 1 << 2, /* does this represent FS metadata? */
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ABD_FLAG_MULTI_ZONE = 1 << 3, /* pages split over memory zones */
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ABD_FLAG_MULTI_CHUNK = 1 << 4, /* pages split over multiple chunks */
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ABD_FLAG_LINEAR_PAGE = 1 << 5, /* linear but allocd from page */
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ABD_FLAG_GANG = 1 << 6, /* mult ABDs chained together */
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ABD_FLAG_GANG_FREE = 1 << 7, /* gang ABD is responsible for mem */
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ABD_FLAG_ZEROS = 1 << 8, /* ABD for zero-filled buffer */
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} abd_flags_t;
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typedef enum abd_stats_op {
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ABDSTAT_INCR, /* Increase abdstat values */
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ABDSTAT_DECR /* Decrease abdstat values */
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} abd_stats_op_t;
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struct abd {
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abd_flags_t abd_flags;
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uint_t abd_size; /* excludes scattered abd_offset */
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list_node_t abd_gang_link;
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struct abd *abd_parent;
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zfs_refcount_t abd_children;
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kmutex_t abd_mtx;
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union {
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struct abd_scatter {
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uint_t abd_offset;
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#if defined(__FreeBSD__) && defined(_KERNEL)
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uint_t abd_chunk_size;
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void *abd_chunks[];
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#else
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uint_t abd_nents;
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struct scatterlist *abd_sgl;
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#endif
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} abd_scatter;
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struct abd_linear {
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void *abd_buf;
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struct scatterlist *abd_sgl; /* for LINEAR_PAGE */
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} abd_linear;
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struct abd_gang {
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list_t abd_gang_chain;
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} abd_gang;
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} abd_u;
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};
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struct scatterlist; /* forward declaration */
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struct abd_iter {
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/* public interface */
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void *iter_mapaddr; /* addr corresponding to iter_pos */
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size_t iter_mapsize; /* length of data valid at mapaddr */
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/* private */
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abd_t *iter_abd; /* ABD being iterated through */
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size_t iter_pos;
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size_t iter_offset; /* offset in current sg/abd_buf, */
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/* abd_offset included */
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struct scatterlist *iter_sg; /* current sg */
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};
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extern abd_t *abd_zero_scatter;
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abd_t *abd_gang_get_offset(abd_t *, size_t *);
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/*
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* OS specific functions
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*/
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abd_t *abd_alloc_struct(size_t);
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abd_t *abd_get_offset_scatter(abd_t *, size_t);
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void abd_free_struct(abd_t *);
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void abd_alloc_chunks(abd_t *, size_t);
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void abd_free_chunks(abd_t *);
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boolean_t abd_size_alloc_linear(size_t);
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void abd_update_scatter_stats(abd_t *, abd_stats_op_t);
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void abd_update_linear_stats(abd_t *, abd_stats_op_t);
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void abd_verify_scatter(abd_t *);
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void abd_free_linear_page(abd_t *);
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/* OS specific abd_iter functions */
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void abd_iter_init(struct abd_iter *, abd_t *);
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boolean_t abd_iter_at_end(struct abd_iter *);
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void abd_iter_advance(struct abd_iter *, size_t);
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void abd_iter_map(struct abd_iter *);
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void abd_iter_unmap(struct abd_iter *);
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/*
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* Helper macros
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*/
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#define ABDSTAT(stat) (abd_stats.stat.value.ui64)
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#define ABDSTAT_INCR(stat, val) \
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atomic_add_64(&abd_stats.stat.value.ui64, (val))
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#define ABDSTAT_BUMP(stat) ABDSTAT_INCR(stat, 1)
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#define ABDSTAT_BUMPDOWN(stat) ABDSTAT_INCR(stat, -1)
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#define ABD_SCATTER(abd) (abd->abd_u.abd_scatter)
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#define ABD_LINEAR_BUF(abd) (abd->abd_u.abd_linear.abd_buf)
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#define ABD_GANG(abd) (abd->abd_u.abd_gang)
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#if defined(_KERNEL)
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#if defined(__FreeBSD__)
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#define abd_enter_critical(flags) critical_enter()
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#define abd_exit_critical(flags) critical_exit()
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#else
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#define abd_enter_critical(flags) local_irq_save(flags)
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#define abd_exit_critical(flags) local_irq_restore(flags)
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#endif
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#else /* !_KERNEL */
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#define abd_enter_critical(flags) ((void)0)
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#define abd_exit_critical(flags) ((void)0)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ABD_IMPL_H */
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