168 lines
4.1 KiB
C
168 lines
4.1 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 by Delphix. All rights reserved.
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*/
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#ifndef _ABD_H
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#define _ABD_H
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#include <sys/isa_defs.h>
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#include <sys/int_types.h>
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#include <sys/debug.h>
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#include <sys/refcount.h>
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#ifdef _KERNEL
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#include <linux/mm.h>
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#include <linux/bio.h>
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#include <sys/uio.h>
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#endif
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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_flags_t;
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typedef 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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struct abd *abd_parent;
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refcount_t abd_children;
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union {
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struct abd_scatter {
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uint_t abd_offset;
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uint_t abd_chunk_size;
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struct page *abd_chunks[];
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} abd_scatter;
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struct abd_linear {
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void *abd_buf;
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} abd_linear;
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} abd_u;
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} abd_t;
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typedef int abd_iter_func_t(void *buf, size_t len, void *private);
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typedef int abd_iter_func2_t(void *bufa, void *bufb, size_t len, void *private);
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extern int zfs_abd_scatter_enabled;
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static inline boolean_t
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abd_is_linear(abd_t *abd)
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{
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return ((abd->abd_flags & ABD_FLAG_LINEAR) != 0);
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}
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/*
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* Allocations and deallocations
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*/
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abd_t *abd_alloc(size_t, boolean_t);
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abd_t *abd_alloc_linear(size_t, boolean_t);
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abd_t *abd_alloc_for_io(size_t, boolean_t);
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abd_t *abd_alloc_sametype(abd_t *, size_t);
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void abd_free(abd_t *);
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abd_t *abd_get_offset(abd_t *, size_t);
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abd_t *abd_get_from_buf(void *, size_t);
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void abd_put(abd_t *);
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/*
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* Conversion to and from a normal buffer
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*/
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void *abd_to_buf(abd_t *);
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void *abd_borrow_buf(abd_t *, size_t);
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void *abd_borrow_buf_copy(abd_t *, size_t);
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void abd_return_buf(abd_t *, void *, size_t);
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void abd_return_buf_copy(abd_t *, void *, size_t);
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void abd_take_ownership_of_buf(abd_t *, boolean_t);
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void abd_release_ownership_of_buf(abd_t *);
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/*
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* ABD operations
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*/
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int abd_iterate_func(abd_t *, size_t, size_t, abd_iter_func_t *, void *);
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int abd_iterate_func2(abd_t *, abd_t *, size_t, size_t, size_t,
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abd_iter_func2_t *, void *);
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void abd_copy_off(abd_t *, abd_t *, size_t, size_t, size_t);
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void abd_copy_from_buf_off(abd_t *, const void *, size_t, size_t);
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void abd_copy_to_buf_off(void *, abd_t *, size_t, size_t);
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int abd_cmp(abd_t *, abd_t *);
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int abd_cmp_buf_off(abd_t *, const void *, size_t, size_t);
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void abd_zero_off(abd_t *, size_t, size_t);
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#if defined(_KERNEL) && defined(HAVE_SPL)
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unsigned int abd_scatter_bio_map_off(struct bio *, abd_t *, unsigned int,
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size_t);
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unsigned long abd_nr_pages_off(abd_t *, unsigned int, size_t);
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#endif
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/*
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* Wrappers for calls with offsets of 0
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*/
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static inline void
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abd_copy(abd_t *dabd, abd_t *sabd, size_t size)
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{
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abd_copy_off(dabd, sabd, 0, 0, size);
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}
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static inline void
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abd_copy_from_buf(abd_t *abd, void *buf, size_t size)
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{
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abd_copy_from_buf_off(abd, buf, 0, size);
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}
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static inline void
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abd_copy_to_buf(void* buf, abd_t *abd, size_t size)
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{
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abd_copy_to_buf_off(buf, abd, 0, size);
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}
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static inline int
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abd_cmp_buf(abd_t *abd, void *buf, size_t size)
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{
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return (abd_cmp_buf_off(abd, buf, 0, size));
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}
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static inline void
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abd_zero(abd_t *abd, size_t size)
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{
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abd_zero_off(abd, 0, size);
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}
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/*
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* Module lifecycle
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*/
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void abd_init(void);
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void abd_fini(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ABD_H */
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