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4ef69de384
The Linux 5.16.14 kernel's coccicheck caught this. The semantic patch that caught it was: ./scripts/coccinelle/null/badzero.cocci Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Closes #14372
118 lines
3.0 KiB
C
118 lines
3.0 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://opensource.org/licenses/CDDL-1.0.
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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 2022 Tino Reichardt <milky-zfs@mcmilk.de>
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*/
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#include <sys/zfs_context.h>
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#include <sys/zio_checksum.h>
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#include <sys/blake3.h>
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#include <sys/abd.h>
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static int
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blake3_incremental(void *buf, size_t size, void *arg)
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{
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BLAKE3_CTX *ctx = arg;
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Blake3_Update(ctx, buf, size);
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return (0);
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}
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/*
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* Computes a native 256-bit BLAKE3 MAC checksum. Please note that this
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* function requires the presence of a ctx_template that should be allocated
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* using abd_checksum_blake3_tmpl_init.
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*/
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void
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abd_checksum_blake3_native(abd_t *abd, uint64_t size, const void *ctx_template,
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zio_cksum_t *zcp)
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{
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ASSERT(ctx_template != NULL);
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#if defined(_KERNEL)
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BLAKE3_CTX *ctx = blake3_per_cpu_ctx[CPU_SEQID_UNSTABLE];
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#else
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BLAKE3_CTX *ctx = kmem_alloc(sizeof (*ctx), KM_SLEEP);
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#endif
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memcpy(ctx, ctx_template, sizeof (*ctx));
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(void) abd_iterate_func(abd, 0, size, blake3_incremental, ctx);
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Blake3_Final(ctx, (uint8_t *)zcp);
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#if !defined(_KERNEL)
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memset(ctx, 0, sizeof (*ctx));
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kmem_free(ctx, sizeof (*ctx));
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#endif
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}
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/*
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* Byteswapped version of abd_checksum_blake3_native. This just invokes
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* the native checksum function and byteswaps the resulting checksum (since
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* BLAKE3 is internally endian-insensitive).
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*/
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void
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abd_checksum_blake3_byteswap(abd_t *abd, uint64_t size,
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const void *ctx_template, zio_cksum_t *zcp)
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{
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zio_cksum_t tmp;
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ASSERT(ctx_template != NULL);
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abd_checksum_blake3_native(abd, size, ctx_template, &tmp);
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zcp->zc_word[0] = BSWAP_64(tmp.zc_word[0]);
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zcp->zc_word[1] = BSWAP_64(tmp.zc_word[1]);
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zcp->zc_word[2] = BSWAP_64(tmp.zc_word[2]);
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zcp->zc_word[3] = BSWAP_64(tmp.zc_word[3]);
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}
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/*
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* Allocates a BLAKE3 MAC template suitable for using in BLAKE3 MAC checksum
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* computations and returns a pointer to it.
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*/
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void *
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abd_checksum_blake3_tmpl_init(const zio_cksum_salt_t *salt)
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{
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BLAKE3_CTX *ctx;
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ASSERT(sizeof (salt->zcs_bytes) == 32);
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/* init reference object */
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ctx = kmem_zalloc(sizeof (*ctx), KM_SLEEP);
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Blake3_InitKeyed(ctx, salt->zcs_bytes);
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return (ctx);
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}
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/*
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* Frees a BLAKE3 context template previously allocated using
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* zio_checksum_blake3_tmpl_init.
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*/
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void
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abd_checksum_blake3_tmpl_free(void *ctx_template)
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{
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BLAKE3_CTX *ctx = ctx_template;
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memset(ctx, 0, sizeof (*ctx));
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kmem_free(ctx, sizeof (*ctx));
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}
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