debuggers.hg

view tools/blktap2/drivers/qcow.h @ 22848:6341fe0f4e5a

Added tag 4.1.0-rc2 for changeset 9dca60d88c63
author Keir Fraser <keir@xen.org>
date Tue Jan 25 14:06:55 2011 +0000 (2011-01-25)
parents 1c627434605e
children
line source
1 /*
2 * Copyright (c) 2008, XenSource Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of XenSource Inc. nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
20 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
29 #ifndef _QCOW_H_
30 #define _QCOW_H_
32 #include "aes.h"
33 /**************************************************************/
34 /* QEMU COW block driver with compression and encryption support */
36 #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
37 #define XEN_MAGIC (('X' << 24) | ('E' << 16) | ('N' << 8) | 0xfb)
38 #define QCOW_VERSION 1
40 #define QCOW_CRYPT_NONE 0x00
41 #define QCOW_CRYPT_AES 0x01
43 #define QCOW_OFLAG_COMPRESSED (1LL << 63)
44 #define SPARSE_FILE 0x01
45 #define EXTHDR_L1_BIG_ENDIAN 0x02
47 #ifndef O_BINARY
48 #define O_BINARY 0
49 #endif
51 #define ROUNDUP(l, s) \
52 ({ \
53 (uint64_t)( \
54 (l + (s - 1)) - ((l + (s - 1)) % s)); \
55 })
57 typedef struct QCowHeader {
58 uint32_t magic;
59 uint32_t version;
60 uint64_t backing_file_offset;
61 uint32_t backing_file_size;
62 uint32_t mtime;
63 uint64_t size; /* in bytes */
64 uint8_t cluster_bits;
65 uint8_t l2_bits;
66 uint32_t crypt_method;
67 uint64_t l1_table_offset;
68 } QCowHeader;
70 /*Extended header for Xen enhancements*/
71 typedef struct QCowHeader_ext {
72 uint32_t xmagic;
73 uint32_t cksum;
74 uint32_t min_cluster_alloc;
75 uint32_t flags;
76 } QCowHeader_ext;
78 uint32_t gen_cksum(char *ptr, int len);
79 int get_filesize(char *filename, uint64_t *size, struct stat *st);
80 int qtruncate(int fd, off_t length, int sparse);
82 #define L2_CACHE_SIZE 16 /*Fixed allocation in Qemu*/
84 struct tdqcow_state {
85 int fd; /*Main Qcow file descriptor */
86 uint64_t fd_end; /*Store a local record of file length */
87 char *name; /*Record of the filename*/
88 uint32_t backing_file_size;
89 uint64_t backing_file_offset;
90 uint8_t extended; /*File contains extended header*/
91 int encrypted; /*File contents are encrypted or plain*/
92 int cluster_bits; /*Determines length of cluster as
93 *indicated by file hdr*/
94 int cluster_size; /*Length of cluster*/
95 int cluster_sectors; /*Number of sectors per cluster*/
96 int cluster_alloc; /*Blktap fix for allocating full
97 *extents*/
98 int min_cluster_alloc; /*Blktap historical extent alloc*/
99 int sparse; /*Indicates whether to preserve sparseness*/
100 int l2_bits; /*Size of L2 table entry*/
101 int l2_size; /*Full table size*/
102 int l1_size; /*L1 table size*/
103 uint64_t cluster_offset_mask;
104 uint64_t l1_table_offset; /*L1 table offset from beginning of
105 *file*/
106 uint64_t *l1_table; /*L1 table entries*/
107 uint64_t *l2_cache; /*We maintain a cache of size
108 *L2_CACHE_SIZE of most read entries*/
109 uint64_t l2_cache_offsets[L2_CACHE_SIZE]; /*L2 cache entries*/
110 uint32_t l2_cache_counts[L2_CACHE_SIZE]; /*Cache access record*/
111 uint8_t *cluster_cache;
112 uint8_t *cluster_data;
113 uint64_t cluster_cache_offset; /**/
114 uint32_t crypt_method; /*current crypt method, 0 if no
115 *key yet */
116 uint32_t crypt_method_header; /**/
117 AES_KEY aes_encrypt_key; /*AES key*/
118 AES_KEY aes_decrypt_key; /*AES key*/
120 /* libaio state */
121 int aio_free_count;
122 int max_aio_reqs;
123 struct qcow_request *aio_requests;
124 struct qcow_request **aio_free_list;
126 };
128 int qcow_create(const char *filename, uint64_t total_size,
129 const char *backing_file, int sparse);
131 #endif //_QCOW_H_