+++ /dev/null
-/*
- * 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 http://www.opensolaris.org/os/licensing.
- * 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 by Delphix. All rights reserved.
- */
-
-#ifndef _ABD_H
-#define _ABD_H
-
-#include <sys/isa_defs.h>
-#include <sys/int_types.h>
-#include <sys/debug.h>
-#include <sys/refcount.h>
-#ifdef _KERNEL
-#include <linux/mm.h>
-#include <linux/bio.h>
-#include <sys/uio.h>
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-typedef enum abd_flags {
- ABD_FLAG_LINEAR = 1 << 0, /* is buffer linear (or scattered)? */
- ABD_FLAG_OWNER = 1 << 1, /* does it own its data buffers? */
- ABD_FLAG_META = 1 << 2, /* does this represent FS metadata? */
- ABD_FLAG_MULTI_ZONE = 1 << 3, /* pages split over memory zones */
- ABD_FLAG_MULTI_CHUNK = 1 << 4 /* pages split over multiple chunks */
-} abd_flags_t;
-
-typedef struct abd {
- abd_flags_t abd_flags;
- uint_t abd_size; /* excludes scattered abd_offset */
- struct abd *abd_parent;
- refcount_t abd_children;
- union {
- struct abd_scatter {
- uint_t abd_offset;
- uint_t abd_nents;
- struct scatterlist *abd_sgl;
- } abd_scatter;
- struct abd_linear {
- void *abd_buf;
- } abd_linear;
- } abd_u;
-} abd_t;
-
-typedef int abd_iter_func_t(void *buf, size_t len, void *private);
-typedef int abd_iter_func2_t(void *bufa, void *bufb, size_t len, void *private);
-
-extern int zfs_abd_scatter_enabled;
-
-static inline boolean_t
-abd_is_linear(abd_t *abd)
-{
- return ((abd->abd_flags & ABD_FLAG_LINEAR) != 0 ? B_TRUE : B_FALSE);
-}
-
-/*
- * Allocations and deallocations
- */
-
-abd_t *abd_alloc(size_t, boolean_t);
-abd_t *abd_alloc_linear(size_t, boolean_t);
-abd_t *abd_alloc_for_io(size_t, boolean_t);
-abd_t *abd_alloc_sametype(abd_t *, size_t);
-void abd_free(abd_t *);
-abd_t *abd_get_offset(abd_t *, size_t);
-abd_t *abd_get_offset_size(abd_t *, size_t, size_t);
-abd_t *abd_get_from_buf(void *, size_t);
-void abd_put(abd_t *);
-
-/*
- * Conversion to and from a normal buffer
- */
-
-void *abd_to_buf(abd_t *);
-void *abd_borrow_buf(abd_t *, size_t);
-void *abd_borrow_buf_copy(abd_t *, size_t);
-void abd_return_buf(abd_t *, void *, size_t);
-void abd_return_buf_copy(abd_t *, void *, size_t);
-void abd_take_ownership_of_buf(abd_t *, boolean_t);
-void abd_release_ownership_of_buf(abd_t *);
-
-/*
- * ABD operations
- */
-
-int abd_iterate_func(abd_t *, size_t, size_t, abd_iter_func_t *, void *);
-int abd_iterate_func2(abd_t *, abd_t *, size_t, size_t, size_t,
- abd_iter_func2_t *, void *);
-void abd_copy_off(abd_t *, abd_t *, size_t, size_t, size_t);
-void abd_copy_from_buf_off(abd_t *, const void *, size_t, size_t);
-void abd_copy_to_buf_off(void *, abd_t *, size_t, size_t);
-int abd_cmp(abd_t *, abd_t *);
-int abd_cmp_buf_off(abd_t *, const void *, size_t, size_t);
-void abd_zero_off(abd_t *, size_t, size_t);
-
-#if defined(_KERNEL) && defined(HAVE_SPL)
-unsigned int abd_scatter_bio_map_off(struct bio *, abd_t *, unsigned int,
- size_t);
-unsigned long abd_nr_pages_off(abd_t *, unsigned int, size_t);
-#endif
-
-void abd_raidz_gen_iterate(abd_t **cabds, abd_t *dabd,
- ssize_t csize, ssize_t dsize, const unsigned parity,
- void (*func_raidz_gen)(void **, const void *, size_t, size_t));
-void abd_raidz_rec_iterate(abd_t **cabds, abd_t **tabds,
- ssize_t tsize, const unsigned parity,
- void (*func_raidz_rec)(void **t, const size_t tsize, void **c,
- const unsigned *mul),
- const unsigned *mul);
-
-/*
- * Wrappers for calls with offsets of 0
- */
-
-static inline void
-abd_copy(abd_t *dabd, abd_t *sabd, size_t size)
-{
- abd_copy_off(dabd, sabd, 0, 0, size);
-}
-
-static inline void
-abd_copy_from_buf(abd_t *abd, const void *buf, size_t size)
-{
- abd_copy_from_buf_off(abd, buf, 0, size);
-}
-
-static inline void
-abd_copy_to_buf(void* buf, abd_t *abd, size_t size)
-{
- abd_copy_to_buf_off(buf, abd, 0, size);
-}
-
-static inline int
-abd_cmp_buf(abd_t *abd, const void *buf, size_t size)
-{
- return (abd_cmp_buf_off(abd, buf, 0, size));
-}
-
-static inline void
-abd_zero(abd_t *abd, size_t size)
-{
- abd_zero_off(abd, 0, size);
-}
-
-/*
- * Module lifecycle
- */
-
-void abd_init(void);
-void abd_fini(void);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _ABD_H */
projects / mirror_ubuntu-bionic-kernel.git / blobdiff