Coiby Xu | 5937835 | 2020-09-18 16:09:09 +0800 | [diff] [blame] | 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 | } |