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47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
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/*
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* Block utility functions
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*
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* Copyright IBM, Corp. 2011
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* Copyright (c) 2020 Coiby Xu <coiby.xu@gmail.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qapi/qmp/qerror.h"
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#include "block-helpers.h"
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/**
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* check_block_size:
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* @id: The unique ID of the object
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* @name: The name of the property being validated
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* @value: The block size in bytes
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* @errp: A pointer to an area to store an error
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*
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* This function checks that the block size meets the following conditions:
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* 1. At least MIN_BLOCK_SIZE
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* 2. No larger than MAX_BLOCK_SIZE
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* 3. A power of 2
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*/
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void check_block_size(const char *id, const char *name, int64_t value,
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Error **errp)
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{
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/* value of 0 means "unset" */
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if (value && (value < MIN_BLOCK_SIZE || value > MAX_BLOCK_SIZE)) {
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error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE,
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id, name, value, MIN_BLOCK_SIZE, MAX_BLOCK_SIZE);
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return;
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}
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/* We rely on power-of-2 blocksizes for bitmasks */
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if ((value & (value - 1)) != 0) {
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error_setg(errp,
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"Property %s.%s doesn't take value '%" PRId64
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"', it's not a power of 2",
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id, name, value);
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return;
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}
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}
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