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Adding the mutli abd type, which allows for linear and scatter abd's to be chained together into a single abd. As part of this PR, the ABD code has been reorganized so the OS dependant ABD code has been split into their own independent files. The shared ABD code is now under: module/zfs/abd.c With the independent OS code in: module/os/linux/zfs/abd_os.c module/os/freebsd/zfs/abd_os.c Signed-off-by: Brian Atkinson <[email protected]> Co-authored-by: Mark Maybee <[email protected]> Co-authored-by: Brian Atkinson <[email protected]>
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,135 @@ | ||
| /* | ||
| * 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, 2019 by Delphix. All rights reserved. | ||
| */ | ||
|
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| #ifndef _ABD_IMPL_H | ||
| #define _ABD_IMPL_H | ||
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| #include <sys/abd.h> | ||
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
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| 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_FLAG_LINEAR_PAGE = 1 << 5, /* linear but allocd from page */ | ||
| ABD_FLAG_MULTI_LIST = 1 << 6, /* mult ABDs chained together */ | ||
| ABD_FLAG_MULTI_FREE = 1 << 7, /* mult ABD is responsible for mem */ | ||
| ABD_FLAG_ZEROS = 1 << 8, /* ABD for zero-filled buffer */ | ||
| } abd_flags_t; | ||
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| typedef enum abd_stats_op { | ||
| ABDSTAT_INCR, /* Increase abdstat values */ | ||
| ABDSTAT_DECR /* Decrease abdstat values */ | ||
| } abd_stats_op_t; | ||
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| struct abd { | ||
| abd_flags_t abd_flags; | ||
| uint_t abd_size; /* excludes scattered abd_offset */ | ||
| list_node_t abd_multi_link; | ||
| struct abd *abd_parent; | ||
| zfs_refcount_t abd_children; | ||
| kmutex_t abd_mtx; | ||
| union { | ||
| struct abd_scatter { | ||
| uint_t abd_offset; | ||
| #if defined(__FreeBSD__) && defined(_KERNEL) | ||
| uint_t abd_chunk_size; | ||
| void *abd_chunks[]; | ||
| #else | ||
| uint_t abd_nents; | ||
| struct scatterlist *abd_sgl; | ||
| #endif | ||
| } abd_scatter; | ||
| struct abd_linear { | ||
| void *abd_buf; | ||
| struct scatterlist *abd_sgl; /* for LINEAR_PAGE */ | ||
| } abd_linear; | ||
| struct abd_multi { | ||
| list_t abd_chain; | ||
| } abd_multi; | ||
| } abd_u; | ||
| }; | ||
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| struct scatterlist; /* forward declaration */ | ||
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| struct abd_iter { | ||
| /* public interface */ | ||
| void *iter_mapaddr; /* addr corresponding to iter_pos */ | ||
| size_t iter_mapsize; /* length of data valid at mapaddr */ | ||
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| /* private */ | ||
| abd_t *iter_abd; /* ABD being iterated through */ | ||
| size_t iter_pos; | ||
| size_t iter_offset; /* offset in current sg/abd_buf, */ | ||
| /* abd_offset included */ | ||
| struct scatterlist *iter_sg; /* current sg */ | ||
| }; | ||
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| /* | ||
| * OS specific functions | ||
| */ | ||
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| abd_t *abd_alloc_struct(size_t); | ||
| abd_t *abd_get_offset_scatter(abd_t *, size_t); | ||
| void abd_free_struct(abd_t *); | ||
| void abd_alloc_pages(abd_t *, size_t); | ||
| void abd_free_pages(abd_t *); | ||
| boolean_t abd_size_alloc_linear(size_t); | ||
| void abd_update_scatter_stats(abd_t *, abd_stats_op_t); | ||
| void abd_update_linear_stats(abd_t *, abd_stats_op_t); | ||
| void abd_verify_scatter(abd_t *); | ||
| void abd_free_linear_page(abd_t *); | ||
| void abd_enter_critical(unsigned long); | ||
| void abd_exit_critical(unsigned long); | ||
| /* OS specific abd_iter functions */ | ||
| void abd_iter_init(struct abd_iter *, abd_t *); | ||
| boolean_t abd_iter_at_end(struct abd_iter *); | ||
| void abd_iter_advance(struct abd_iter *, size_t); | ||
| void abd_iter_map(struct abd_iter *); | ||
| void abd_iter_unmap(struct abd_iter *); | ||
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| /* | ||
| * Helper macros | ||
| */ | ||
| #define ABDSTAT(stat) (abd_stats.stat.value.ui64) | ||
| #define ABDSTAT_INCR(stat, val) \ | ||
| atomic_add_64(&abd_stats.stat.value.ui64, (val)) | ||
| #define ABDSTAT_BUMP(stat) ABDSTAT_INCR(stat, 1) | ||
| #define ABDSTAT_BUMPDOWN(stat) ABDSTAT_INCR(stat, -1) | ||
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| #define ABD_SCATTER(abd) (abd->abd_u.abd_scatter) | ||
| #define ABD_LINEAR_BUF(abd) (abd->abd_u.abd_linear.abd_buf) | ||
| #define ABD_MULTI(abd) (abd->abd_u.abd_multi) | ||
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| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
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| #endif /* _ABD_IMPL_H */ |
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@@ -39,6 +39,7 @@ KERNEL_C = \ | |
| zpool_prop.c \ | ||
| zprop_common.c \ | ||
| abd.c \ | ||
| abd_os.c \ | ||
| aggsum.c \ | ||
| arc.c \ | ||
| arc_os.c \ | ||
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