blob: c4851432f56601158becd975f49c62dc7dfbbb74 [file] [log] [blame]
Coiby Xu59378352020-09-18 16:09:09 +08001/*
2 * Block utility functions
3 *
4 * Copyright IBM, Corp. 2011
5 * Copyright (c) 2020 Coiby Xu <coiby.xu@gmail.com>
6 *
7 * This work is licensed under the terms of the GNU GPL, version 2 or later.
8 * See the COPYING file in the top-level directory.
9 */
10
11#include "qemu/osdep.h"
12#include "qapi/error.h"
13#include "qapi/qmp/qerror.h"
14#include "block-helpers.h"
15
16/**
17 * check_block_size:
18 * @id: The unique ID of the object
19 * @name: The name of the property being validated
20 * @value: The block size in bytes
21 * @errp: A pointer to an area to store an error
22 *
23 * This function checks that the block size meets the following conditions:
24 * 1. At least MIN_BLOCK_SIZE
25 * 2. No larger than MAX_BLOCK_SIZE
26 * 3. A power of 2
27 */
28void check_block_size(const char *id, const char *name, int64_t value,
29 Error **errp)
30{
31 /* value of 0 means "unset" */
32 if (value && (value < MIN_BLOCK_SIZE || value > MAX_BLOCK_SIZE)) {
33 error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE,
34 id, name, value, MIN_BLOCK_SIZE, MAX_BLOCK_SIZE);
35 return;
36 }
37
38 /* We rely on power-of-2 blocksizes for bitmasks */
39 if ((value & (value - 1)) != 0) {
40 error_setg(errp,
41 "Property %s.%s doesn't take value '%" PRId64
42 "', it's not a power of 2",
43 id, name, value);
44 return;
45 }
46}