Branch data Line data Source code
1 : : /*
2 : : * Copyright (c) 2017, Citrix Systems, Inc.
3 : : *
4 : : * All rights reserved.
5 : : *
6 : : * Redistribution and use in source and binary forms, with or without
7 : : * modification, are permitted provided that the following conditions are met:
8 : : *
9 : : * 1. Redistributions of source code must retain the above copyright
10 : : * notice, this list of conditions and the following disclaimer.
11 : : * 2. Redistributions in binary form must reproduce the above copyright
12 : : * notice, this list of conditions and the following disclaimer in the
13 : : * documentation and/or other materials provided with the distribution.
14 : : * 3. Neither the name of the copyright holder nor the names of its
15 : : * contributors may be used to endorse or promote products derived from
16 : : * this software without specific prior written permission.
17 : : *
18 : : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 : : * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 : : * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 : : * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
22 : : * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 : : * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 : : * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25 : : * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 : : * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27 : : * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 : : * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 : : */
30 : :
31 : : #ifndef _CBT_UTIL_H_
32 : : #define _CBT_UTIL_H_
33 : :
34 : : #include <uuid/uuid.h>
35 : : #include "../drivers/tapdisk-log.h"
36 : :
37 : : #define CBT_BLOCK_SIZE (64 * 1024)
38 : :
39 : : struct cbt_log_metadata {
40 : : uuid_t parent;
41 : : uuid_t child;
42 : : int consistent;
43 : : uint64_t size;
44 : : };
45 : :
46 : : struct cbt_log_data {
47 : : struct cbt_log_metadata metadata;
48 : : char *bitmap;
49 : : };
50 : :
51 : : static inline uint64_t
52 : : roundup_div(uint64_t a, int b)
53 : : {
54 : : return (a + b - 1) / b;
55 : : }
56 : :
57 : : static inline uint64_t
58 : : bitmap_size(uint64_t sz)
59 : : {
60 : : // Original disk size is in bytes
61 : 10 : uint64_t num_blocks = roundup_div(sz, CBT_BLOCK_SIZE);
62 : : return (roundup_div(num_blocks, 8));
63 : : }
64 : :
65 : :
66 : : #endif
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