163 lines
4.2 KiB
C
163 lines
4.2 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_H
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#define _ABD_H
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#include <sys/isa_defs.h>
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#include <sys/debug.h>
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#include <sys/zfs_refcount.h>
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#include <sys/uio.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct abd; /* forward declaration */
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typedef struct abd abd_t;
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typedef int abd_iter_func_t(void *buf, size_t len, void *priv);
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typedef int abd_iter_func2_t(void *bufa, void *bufb, size_t len, void *priv);
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extern int zfs_abd_scatter_enabled;
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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_gang_abd(void);
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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_gang_add(abd_t *, abd_t *, boolean_t);
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void abd_free(abd_t *);
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void abd_put(abd_t *);
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abd_t *abd_get_offset(abd_t *, size_t);
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abd_t *abd_get_offset_size(abd_t *, size_t, size_t);
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abd_t *abd_get_zeros(size_t);
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abd_t *abd_get_from_buf(void *, size_t);
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void abd_cache_reap_now(void);
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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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void abd_verify(abd_t *);
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uint_t abd_get_size(abd_t *);
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void abd_raidz_gen_iterate(abd_t **cabds, abd_t *dabd,
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ssize_t csize, ssize_t dsize, const unsigned parity,
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void (*func_raidz_gen)(void **, const void *, size_t, size_t));
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void abd_raidz_rec_iterate(abd_t **cabds, abd_t **tabds,
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ssize_t tsize, const unsigned parity,
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void (*func_raidz_rec)(void **t, const size_t tsize, void **c,
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const unsigned *mul),
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const unsigned *mul);
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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, const 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, const 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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* ABD type check functions
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*/
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boolean_t abd_is_linear(abd_t *);
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boolean_t abd_is_gang(abd_t *);
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boolean_t abd_is_linear_page(abd_t *);
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/*
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* Module lifecycle
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* Defined in each specific OS's abd_os.c
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*/
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void abd_init(void);
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void abd_fini(void);
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/*
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* Linux ABD bio functions
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*/
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#if defined(__linux__) && defined(_KERNEL)
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unsigned int abd_bio_map_off(struct bio *, abd_t *, unsigned int, 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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#ifdef __cplusplus
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}
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#endif
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#endif /* _ABD_H */
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