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