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1 | /* |
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 | */ | |
28 | void 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 | } |