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6b239d1757
wmsum was designed exactly for cases like these with many updates and rare reads. It allows to completely avoid atomic operations on congested global variables. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Mark Maybee <mark.maybee@delphix.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #12172
113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/*
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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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#include <sys/wmsum.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_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 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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abd_t *abd_alloc_struct(size_t);
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void abd_free_struct(abd_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_impl(size_t);
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abd_t *abd_get_offset_scatter(abd_t *, abd_t *, size_t);
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void abd_free_struct_impl(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_INCR(stat, val) \
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wmsum_add(&abd_sums.stat, (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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