root / block / vhdx.c @ f53ec699
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1 | e8d4e5ff | Jeff Cody | /*
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2 | e8d4e5ff | Jeff Cody | * Block driver for Hyper-V VHDX Images
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3 | e8d4e5ff | Jeff Cody | *
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4 | e8d4e5ff | Jeff Cody | * Copyright (c) 2013 Red Hat, Inc.,
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5 | e8d4e5ff | Jeff Cody | *
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6 | e8d4e5ff | Jeff Cody | * Authors:
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7 | e8d4e5ff | Jeff Cody | * Jeff Cody <jcody@redhat.com>
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8 | e8d4e5ff | Jeff Cody | *
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9 | e8d4e5ff | Jeff Cody | * This is based on the "VHDX Format Specification v0.95", published 4/12/2012
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10 | e8d4e5ff | Jeff Cody | * by Microsoft:
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11 | e8d4e5ff | Jeff Cody | * https://www.microsoft.com/en-us/download/details.aspx?id=29681
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12 | e8d4e5ff | Jeff Cody | *
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13 | e8d4e5ff | Jeff Cody | * This work is licensed under the terms of the GNU LGPL, version 2 or later.
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14 | e8d4e5ff | Jeff Cody | * See the COPYING.LIB file in the top-level directory.
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15 | e8d4e5ff | Jeff Cody | *
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16 | e8d4e5ff | Jeff Cody | */
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17 | e8d4e5ff | Jeff Cody | |
18 | e8d4e5ff | Jeff Cody | #include "qemu-common.h" |
19 | e8d4e5ff | Jeff Cody | #include "block/block_int.h" |
20 | e8d4e5ff | Jeff Cody | #include "qemu/module.h" |
21 | e8d4e5ff | Jeff Cody | #include "qemu/crc32c.h" |
22 | e8d4e5ff | Jeff Cody | #include "block/vhdx.h" |
23 | e8d4e5ff | Jeff Cody | |
24 | e8d4e5ff | Jeff Cody | |
25 | e8d4e5ff | Jeff Cody | /* Several metadata and region table data entries are identified by
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26 | e8d4e5ff | Jeff Cody | * guids in a MS-specific GUID format. */
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27 | e8d4e5ff | Jeff Cody | |
28 | e8d4e5ff | Jeff Cody | |
29 | e8d4e5ff | Jeff Cody | /* ------- Known Region Table GUIDs ---------------------- */
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30 | e8d4e5ff | Jeff Cody | static const MSGUID bat_guid = { .data1 = 0x2dc27766, |
31 | e8d4e5ff | Jeff Cody | .data2 = 0xf623,
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32 | e8d4e5ff | Jeff Cody | .data3 = 0x4200,
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33 | e8d4e5ff | Jeff Cody | .data4 = { 0x9d, 0x64, 0x11, 0x5e, |
34 | e8d4e5ff | Jeff Cody | 0x9b, 0xfd, 0x4a, 0x08} }; |
35 | e8d4e5ff | Jeff Cody | |
36 | e8d4e5ff | Jeff Cody | static const MSGUID metadata_guid = { .data1 = 0x8b7ca206, |
37 | e8d4e5ff | Jeff Cody | .data2 = 0x4790,
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38 | e8d4e5ff | Jeff Cody | .data3 = 0x4b9a,
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39 | e8d4e5ff | Jeff Cody | .data4 = { 0xb8, 0xfe, 0x57, 0x5f, |
40 | e8d4e5ff | Jeff Cody | 0x05, 0x0f, 0x88, 0x6e} }; |
41 | e8d4e5ff | Jeff Cody | |
42 | e8d4e5ff | Jeff Cody | |
43 | e8d4e5ff | Jeff Cody | |
44 | e8d4e5ff | Jeff Cody | /* ------- Known Metadata Entry GUIDs ---------------------- */
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45 | e8d4e5ff | Jeff Cody | static const MSGUID file_param_guid = { .data1 = 0xcaa16737, |
46 | e8d4e5ff | Jeff Cody | .data2 = 0xfa36,
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47 | e8d4e5ff | Jeff Cody | .data3 = 0x4d43,
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48 | e8d4e5ff | Jeff Cody | .data4 = { 0xb3, 0xb6, 0x33, 0xf0, |
49 | e8d4e5ff | Jeff Cody | 0xaa, 0x44, 0xe7, 0x6b} }; |
50 | e8d4e5ff | Jeff Cody | |
51 | e8d4e5ff | Jeff Cody | static const MSGUID virtual_size_guid = { .data1 = 0x2FA54224, |
52 | e8d4e5ff | Jeff Cody | .data2 = 0xcd1b,
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53 | e8d4e5ff | Jeff Cody | .data3 = 0x4876,
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54 | e8d4e5ff | Jeff Cody | .data4 = { 0xb2, 0x11, 0x5d, 0xbe, |
55 | e8d4e5ff | Jeff Cody | 0xd8, 0x3b, 0xf4, 0xb8} }; |
56 | e8d4e5ff | Jeff Cody | |
57 | e8d4e5ff | Jeff Cody | static const MSGUID page83_guid = { .data1 = 0xbeca12ab, |
58 | e8d4e5ff | Jeff Cody | .data2 = 0xb2e6,
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59 | e8d4e5ff | Jeff Cody | .data3 = 0x4523,
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60 | e8d4e5ff | Jeff Cody | .data4 = { 0x93, 0xef, 0xc3, 0x09, |
61 | e8d4e5ff | Jeff Cody | 0xe0, 0x00, 0xc7, 0x46} }; |
62 | e8d4e5ff | Jeff Cody | |
63 | e8d4e5ff | Jeff Cody | |
64 | e8d4e5ff | Jeff Cody | static const MSGUID phys_sector_guid = { .data1 = 0xcda348c7, |
65 | e8d4e5ff | Jeff Cody | .data2 = 0x445d,
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66 | e8d4e5ff | Jeff Cody | .data3 = 0x4471,
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67 | e8d4e5ff | Jeff Cody | .data4 = { 0x9c, 0xc9, 0xe9, 0x88, |
68 | e8d4e5ff | Jeff Cody | 0x52, 0x51, 0xc5, 0x56} }; |
69 | e8d4e5ff | Jeff Cody | |
70 | e8d4e5ff | Jeff Cody | static const MSGUID parent_locator_guid = { .data1 = 0xa8d35f2d, |
71 | e8d4e5ff | Jeff Cody | .data2 = 0xb30b,
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72 | e8d4e5ff | Jeff Cody | .data3 = 0x454d,
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73 | e8d4e5ff | Jeff Cody | .data4 = { 0xab, 0xf7, 0xd3, |
74 | e8d4e5ff | Jeff Cody | 0xd8, 0x48, 0x34, |
75 | e8d4e5ff | Jeff Cody | 0xab, 0x0c} }; |
76 | e8d4e5ff | Jeff Cody | |
77 | e8d4e5ff | Jeff Cody | static const MSGUID logical_sector_guid = { .data1 = 0x8141bf1d, |
78 | e8d4e5ff | Jeff Cody | .data2 = 0xa96f,
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79 | e8d4e5ff | Jeff Cody | .data3 = 0x4709,
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80 | e8d4e5ff | Jeff Cody | .data4 = { 0xba, 0x47, 0xf2, |
81 | e8d4e5ff | Jeff Cody | 0x33, 0xa8, 0xfa, |
82 | e8d4e5ff | Jeff Cody | 0xab, 0x5f} }; |
83 | e8d4e5ff | Jeff Cody | |
84 | e8d4e5ff | Jeff Cody | /* Each parent type must have a valid GUID; this is for parent images
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85 | e8d4e5ff | Jeff Cody | * of type 'VHDX'. If we were to allow e.g. a QCOW2 parent, we would
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86 | e8d4e5ff | Jeff Cody | * need to make up our own QCOW2 GUID type */
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87 | e8d4e5ff | Jeff Cody | static const MSGUID parent_vhdx_guid = { .data1 = 0xb04aefb7, |
88 | e8d4e5ff | Jeff Cody | .data2 = 0xd19e,
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89 | e8d4e5ff | Jeff Cody | .data3 = 0x4a81,
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90 | e8d4e5ff | Jeff Cody | .data4 = { 0xb7, 0x89, 0x25, 0xb8, |
91 | e8d4e5ff | Jeff Cody | 0xe9, 0x44, 0x59, 0x13} }; |
92 | e8d4e5ff | Jeff Cody | |
93 | e8d4e5ff | Jeff Cody | |
94 | e8d4e5ff | Jeff Cody | #define META_FILE_PARAMETER_PRESENT 0x01 |
95 | e8d4e5ff | Jeff Cody | #define META_VIRTUAL_DISK_SIZE_PRESENT 0x02 |
96 | e8d4e5ff | Jeff Cody | #define META_PAGE_83_PRESENT 0x04 |
97 | e8d4e5ff | Jeff Cody | #define META_LOGICAL_SECTOR_SIZE_PRESENT 0x08 |
98 | e8d4e5ff | Jeff Cody | #define META_PHYS_SECTOR_SIZE_PRESENT 0x10 |
99 | e8d4e5ff | Jeff Cody | #define META_PARENT_LOCATOR_PRESENT 0x20 |
100 | e8d4e5ff | Jeff Cody | |
101 | e8d4e5ff | Jeff Cody | #define META_ALL_PRESENT \
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102 | e8d4e5ff | Jeff Cody | (META_FILE_PARAMETER_PRESENT | META_VIRTUAL_DISK_SIZE_PRESENT | \ |
103 | e8d4e5ff | Jeff Cody | META_PAGE_83_PRESENT | META_LOGICAL_SECTOR_SIZE_PRESENT | \ |
104 | e8d4e5ff | Jeff Cody | META_PHYS_SECTOR_SIZE_PRESENT) |
105 | e8d4e5ff | Jeff Cody | |
106 | e8d4e5ff | Jeff Cody | typedef struct VHDXMetadataEntries { |
107 | e8d4e5ff | Jeff Cody | VHDXMetadataTableEntry file_parameters_entry; |
108 | e8d4e5ff | Jeff Cody | VHDXMetadataTableEntry virtual_disk_size_entry; |
109 | e8d4e5ff | Jeff Cody | VHDXMetadataTableEntry page83_data_entry; |
110 | e8d4e5ff | Jeff Cody | VHDXMetadataTableEntry logical_sector_size_entry; |
111 | e8d4e5ff | Jeff Cody | VHDXMetadataTableEntry phys_sector_size_entry; |
112 | e8d4e5ff | Jeff Cody | VHDXMetadataTableEntry parent_locator_entry; |
113 | e8d4e5ff | Jeff Cody | uint16_t present; |
114 | e8d4e5ff | Jeff Cody | } VHDXMetadataEntries; |
115 | e8d4e5ff | Jeff Cody | |
116 | e8d4e5ff | Jeff Cody | |
117 | 059e2fbb | Jeff Cody | typedef struct VHDXSectorInfo { |
118 | 059e2fbb | Jeff Cody | uint32_t bat_idx; /* BAT entry index */
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119 | 059e2fbb | Jeff Cody | uint32_t sectors_avail; /* sectors available in payload block */
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120 | 059e2fbb | Jeff Cody | uint32_t bytes_left; /* bytes left in the block after data to r/w */
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121 | 059e2fbb | Jeff Cody | uint32_t bytes_avail; /* bytes available in payload block */
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122 | 059e2fbb | Jeff Cody | uint64_t file_offset; /* absolute offset in bytes, in file */
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123 | 059e2fbb | Jeff Cody | uint64_t block_offset; /* block offset, in bytes */
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124 | 059e2fbb | Jeff Cody | } VHDXSectorInfo; |
125 | 059e2fbb | Jeff Cody | |
126 | 059e2fbb | Jeff Cody | |
127 | 059e2fbb | Jeff Cody | |
128 | e8d4e5ff | Jeff Cody | typedef struct BDRVVHDXState { |
129 | e8d4e5ff | Jeff Cody | CoMutex lock; |
130 | e8d4e5ff | Jeff Cody | |
131 | e8d4e5ff | Jeff Cody | int curr_header;
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132 | e8d4e5ff | Jeff Cody | VHDXHeader *headers[2];
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133 | e8d4e5ff | Jeff Cody | |
134 | e8d4e5ff | Jeff Cody | VHDXRegionTableHeader rt; |
135 | e8d4e5ff | Jeff Cody | VHDXRegionTableEntry bat_rt; /* region table for the BAT */
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136 | e8d4e5ff | Jeff Cody | VHDXRegionTableEntry metadata_rt; /* region table for the metadata */
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137 | e8d4e5ff | Jeff Cody | |
138 | e8d4e5ff | Jeff Cody | VHDXMetadataTableHeader metadata_hdr; |
139 | e8d4e5ff | Jeff Cody | VHDXMetadataEntries metadata_entries; |
140 | e8d4e5ff | Jeff Cody | |
141 | e8d4e5ff | Jeff Cody | VHDXFileParameters params; |
142 | e8d4e5ff | Jeff Cody | uint32_t block_size; |
143 | e8d4e5ff | Jeff Cody | uint32_t block_size_bits; |
144 | e8d4e5ff | Jeff Cody | uint32_t sectors_per_block; |
145 | e8d4e5ff | Jeff Cody | uint32_t sectors_per_block_bits; |
146 | e8d4e5ff | Jeff Cody | |
147 | e8d4e5ff | Jeff Cody | uint64_t virtual_disk_size; |
148 | e8d4e5ff | Jeff Cody | uint32_t logical_sector_size; |
149 | e8d4e5ff | Jeff Cody | uint32_t physical_sector_size; |
150 | e8d4e5ff | Jeff Cody | |
151 | e8d4e5ff | Jeff Cody | uint64_t chunk_ratio; |
152 | e8d4e5ff | Jeff Cody | uint32_t chunk_ratio_bits; |
153 | e8d4e5ff | Jeff Cody | uint32_t logical_sector_size_bits; |
154 | e8d4e5ff | Jeff Cody | |
155 | e8d4e5ff | Jeff Cody | uint32_t bat_entries; |
156 | e8d4e5ff | Jeff Cody | VHDXBatEntry *bat; |
157 | e8d4e5ff | Jeff Cody | uint64_t bat_offset; |
158 | e8d4e5ff | Jeff Cody | |
159 | e8d4e5ff | Jeff Cody | VHDXParentLocatorHeader parent_header; |
160 | e8d4e5ff | Jeff Cody | VHDXParentLocatorEntry *parent_entries; |
161 | e8d4e5ff | Jeff Cody | |
162 | e8d4e5ff | Jeff Cody | } BDRVVHDXState; |
163 | e8d4e5ff | Jeff Cody | |
164 | e8d4e5ff | Jeff Cody | uint32_t vhdx_checksum_calc(uint32_t crc, uint8_t *buf, size_t size, |
165 | e8d4e5ff | Jeff Cody | int crc_offset)
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166 | e8d4e5ff | Jeff Cody | { |
167 | e8d4e5ff | Jeff Cody | uint32_t crc_new; |
168 | e8d4e5ff | Jeff Cody | uint32_t crc_orig; |
169 | e8d4e5ff | Jeff Cody | assert(buf != NULL);
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170 | e8d4e5ff | Jeff Cody | |
171 | e8d4e5ff | Jeff Cody | if (crc_offset > 0) { |
172 | e8d4e5ff | Jeff Cody | memcpy(&crc_orig, buf + crc_offset, sizeof(crc_orig));
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173 | e8d4e5ff | Jeff Cody | memset(buf + crc_offset, 0, sizeof(crc_orig)); |
174 | e8d4e5ff | Jeff Cody | } |
175 | e8d4e5ff | Jeff Cody | |
176 | e8d4e5ff | Jeff Cody | crc_new = crc32c(crc, buf, size); |
177 | e8d4e5ff | Jeff Cody | if (crc_offset > 0) { |
178 | e8d4e5ff | Jeff Cody | memcpy(buf + crc_offset, &crc_orig, sizeof(crc_orig));
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179 | e8d4e5ff | Jeff Cody | } |
180 | e8d4e5ff | Jeff Cody | |
181 | e8d4e5ff | Jeff Cody | return crc_new;
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182 | e8d4e5ff | Jeff Cody | } |
183 | e8d4e5ff | Jeff Cody | |
184 | e8d4e5ff | Jeff Cody | /* Validates the checksum of the buffer, with an in-place CRC.
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185 | e8d4e5ff | Jeff Cody | *
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186 | e8d4e5ff | Jeff Cody | * Zero is substituted during crc calculation for the original crc field,
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187 | e8d4e5ff | Jeff Cody | * and the crc field is restored afterwards. But the buffer will be modifed
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188 | e8d4e5ff | Jeff Cody | * during the calculation, so this may not be not suitable for multi-threaded
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189 | e8d4e5ff | Jeff Cody | * use.
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190 | e8d4e5ff | Jeff Cody | *
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191 | e8d4e5ff | Jeff Cody | * crc_offset: byte offset in buf of the buffer crc
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192 | e8d4e5ff | Jeff Cody | * buf: buffer pointer
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193 | e8d4e5ff | Jeff Cody | * size: size of buffer (must be > crc_offset+4)
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194 | e8d4e5ff | Jeff Cody | *
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195 | e8d4e5ff | Jeff Cody | * returns true if checksum is valid, false otherwise
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196 | e8d4e5ff | Jeff Cody | */
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197 | e8d4e5ff | Jeff Cody | bool vhdx_checksum_is_valid(uint8_t *buf, size_t size, int crc_offset) |
198 | e8d4e5ff | Jeff Cody | { |
199 | e8d4e5ff | Jeff Cody | uint32_t crc_orig; |
200 | e8d4e5ff | Jeff Cody | uint32_t crc; |
201 | e8d4e5ff | Jeff Cody | |
202 | e8d4e5ff | Jeff Cody | assert(buf != NULL);
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203 | e8d4e5ff | Jeff Cody | assert(size > (crc_offset + 4));
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204 | e8d4e5ff | Jeff Cody | |
205 | e8d4e5ff | Jeff Cody | memcpy(&crc_orig, buf + crc_offset, sizeof(crc_orig));
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206 | e8d4e5ff | Jeff Cody | crc_orig = le32_to_cpu(crc_orig); |
207 | e8d4e5ff | Jeff Cody | |
208 | e8d4e5ff | Jeff Cody | crc = vhdx_checksum_calc(0xffffffff, buf, size, crc_offset);
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209 | e8d4e5ff | Jeff Cody | |
210 | e8d4e5ff | Jeff Cody | return crc == crc_orig;
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211 | e8d4e5ff | Jeff Cody | } |
212 | e8d4e5ff | Jeff Cody | |
213 | e8d4e5ff | Jeff Cody | |
214 | e8d4e5ff | Jeff Cody | /*
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215 | e8d4e5ff | Jeff Cody | * Per the MS VHDX Specification, for every VHDX file:
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216 | e8d4e5ff | Jeff Cody | * - The header section is fixed size - 1 MB
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217 | e8d4e5ff | Jeff Cody | * - The header section is always the first "object"
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218 | e8d4e5ff | Jeff Cody | * - The first 64KB of the header is the File Identifier
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219 | e8d4e5ff | Jeff Cody | * - The first uint64 (8 bytes) is the VHDX Signature ("vhdxfile")
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220 | e8d4e5ff | Jeff Cody | * - The following 512 bytes constitute a UTF-16 string identifiying the
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221 | e8d4e5ff | Jeff Cody | * software that created the file, and is optional and diagnostic only.
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222 | e8d4e5ff | Jeff Cody | *
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223 | e8d4e5ff | Jeff Cody | * Therefore, we probe by looking for the vhdxfile signature "vhdxfile"
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224 | e8d4e5ff | Jeff Cody | */
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225 | e8d4e5ff | Jeff Cody | static int vhdx_probe(const uint8_t *buf, int buf_size, const char *filename) |
226 | e8d4e5ff | Jeff Cody | { |
227 | e8d4e5ff | Jeff Cody | if (buf_size >= 8 && !memcmp(buf, "vhdxfile", 8)) { |
228 | e8d4e5ff | Jeff Cody | return 100; |
229 | e8d4e5ff | Jeff Cody | } |
230 | e8d4e5ff | Jeff Cody | return 0; |
231 | e8d4e5ff | Jeff Cody | } |
232 | e8d4e5ff | Jeff Cody | |
233 | e8d4e5ff | Jeff Cody | /* All VHDX structures on disk are little endian */
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234 | e8d4e5ff | Jeff Cody | static void vhdx_header_le_import(VHDXHeader *h) |
235 | e8d4e5ff | Jeff Cody | { |
236 | e8d4e5ff | Jeff Cody | assert(h != NULL);
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237 | e8d4e5ff | Jeff Cody | |
238 | e8d4e5ff | Jeff Cody | le32_to_cpus(&h->signature); |
239 | e8d4e5ff | Jeff Cody | le32_to_cpus(&h->checksum); |
240 | e8d4e5ff | Jeff Cody | le64_to_cpus(&h->sequence_number); |
241 | e8d4e5ff | Jeff Cody | |
242 | e8d4e5ff | Jeff Cody | leguid_to_cpus(&h->file_write_guid); |
243 | e8d4e5ff | Jeff Cody | leguid_to_cpus(&h->data_write_guid); |
244 | e8d4e5ff | Jeff Cody | leguid_to_cpus(&h->log_guid); |
245 | e8d4e5ff | Jeff Cody | |
246 | e8d4e5ff | Jeff Cody | le16_to_cpus(&h->log_version); |
247 | e8d4e5ff | Jeff Cody | le16_to_cpus(&h->version); |
248 | e8d4e5ff | Jeff Cody | le32_to_cpus(&h->log_length); |
249 | e8d4e5ff | Jeff Cody | le64_to_cpus(&h->log_offset); |
250 | e8d4e5ff | Jeff Cody | } |
251 | e8d4e5ff | Jeff Cody | |
252 | e8d4e5ff | Jeff Cody | |
253 | e8d4e5ff | Jeff Cody | /* opens the specified header block from the VHDX file header section */
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254 | e8d4e5ff | Jeff Cody | static int vhdx_parse_header(BlockDriverState *bs, BDRVVHDXState *s) |
255 | e8d4e5ff | Jeff Cody | { |
256 | e8d4e5ff | Jeff Cody | int ret = 0; |
257 | e8d4e5ff | Jeff Cody | VHDXHeader *header1; |
258 | e8d4e5ff | Jeff Cody | VHDXHeader *header2; |
259 | e8d4e5ff | Jeff Cody | bool h1_valid = false; |
260 | e8d4e5ff | Jeff Cody | bool h2_valid = false; |
261 | e8d4e5ff | Jeff Cody | uint64_t h1_seq = 0;
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262 | e8d4e5ff | Jeff Cody | uint64_t h2_seq = 0;
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263 | e8d4e5ff | Jeff Cody | uint8_t *buffer; |
264 | e8d4e5ff | Jeff Cody | |
265 | e8d4e5ff | Jeff Cody | header1 = qemu_blockalign(bs, sizeof(VHDXHeader));
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266 | e8d4e5ff | Jeff Cody | header2 = qemu_blockalign(bs, sizeof(VHDXHeader));
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267 | e8d4e5ff | Jeff Cody | |
268 | e8d4e5ff | Jeff Cody | buffer = qemu_blockalign(bs, VHDX_HEADER_SIZE); |
269 | e8d4e5ff | Jeff Cody | |
270 | e8d4e5ff | Jeff Cody | s->headers[0] = header1;
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271 | e8d4e5ff | Jeff Cody | s->headers[1] = header2;
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272 | e8d4e5ff | Jeff Cody | |
273 | e8d4e5ff | Jeff Cody | /* We have to read the whole VHDX_HEADER_SIZE instead of
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274 | e8d4e5ff | Jeff Cody | * sizeof(VHDXHeader), because the checksum is over the whole
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275 | e8d4e5ff | Jeff Cody | * region */
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276 | e8d4e5ff | Jeff Cody | ret = bdrv_pread(bs->file, VHDX_HEADER1_OFFSET, buffer, VHDX_HEADER_SIZE); |
277 | e8d4e5ff | Jeff Cody | if (ret < 0) { |
278 | e8d4e5ff | Jeff Cody | goto fail;
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279 | e8d4e5ff | Jeff Cody | } |
280 | e8d4e5ff | Jeff Cody | /* copy over just the relevant portion that we need */
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281 | e8d4e5ff | Jeff Cody | memcpy(header1, buffer, sizeof(VHDXHeader));
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282 | e8d4e5ff | Jeff Cody | vhdx_header_le_import(header1); |
283 | e8d4e5ff | Jeff Cody | |
284 | e8d4e5ff | Jeff Cody | if (vhdx_checksum_is_valid(buffer, VHDX_HEADER_SIZE, 4) && |
285 | e8d4e5ff | Jeff Cody | !memcmp(&header1->signature, "head", 4) && |
286 | e8d4e5ff | Jeff Cody | header1->version == 1) {
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287 | e8d4e5ff | Jeff Cody | h1_seq = header1->sequence_number; |
288 | e8d4e5ff | Jeff Cody | h1_valid = true;
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289 | e8d4e5ff | Jeff Cody | } |
290 | e8d4e5ff | Jeff Cody | |
291 | e8d4e5ff | Jeff Cody | ret = bdrv_pread(bs->file, VHDX_HEADER2_OFFSET, buffer, VHDX_HEADER_SIZE); |
292 | e8d4e5ff | Jeff Cody | if (ret < 0) { |
293 | e8d4e5ff | Jeff Cody | goto fail;
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294 | e8d4e5ff | Jeff Cody | } |
295 | e8d4e5ff | Jeff Cody | /* copy over just the relevant portion that we need */
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296 | e8d4e5ff | Jeff Cody | memcpy(header2, buffer, sizeof(VHDXHeader));
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297 | e8d4e5ff | Jeff Cody | vhdx_header_le_import(header2); |
298 | e8d4e5ff | Jeff Cody | |
299 | e8d4e5ff | Jeff Cody | if (vhdx_checksum_is_valid(buffer, VHDX_HEADER_SIZE, 4) && |
300 | e8d4e5ff | Jeff Cody | !memcmp(&header2->signature, "head", 4) && |
301 | e8d4e5ff | Jeff Cody | header2->version == 1) {
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302 | e8d4e5ff | Jeff Cody | h2_seq = header2->sequence_number; |
303 | e8d4e5ff | Jeff Cody | h2_valid = true;
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304 | e8d4e5ff | Jeff Cody | } |
305 | e8d4e5ff | Jeff Cody | |
306 | e8d4e5ff | Jeff Cody | /* If there is only 1 valid header (or no valid headers), we
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307 | e8d4e5ff | Jeff Cody | * don't care what the sequence numbers are */
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308 | e8d4e5ff | Jeff Cody | if (h1_valid && !h2_valid) {
|
309 | e8d4e5ff | Jeff Cody | s->curr_header = 0;
|
310 | e8d4e5ff | Jeff Cody | } else if (!h1_valid && h2_valid) { |
311 | e8d4e5ff | Jeff Cody | s->curr_header = 1;
|
312 | e8d4e5ff | Jeff Cody | } else if (!h1_valid && !h2_valid) { |
313 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
314 | e8d4e5ff | Jeff Cody | goto fail;
|
315 | e8d4e5ff | Jeff Cody | } else {
|
316 | e8d4e5ff | Jeff Cody | /* If both headers are valid, then we choose the active one by the
|
317 | e8d4e5ff | Jeff Cody | * highest sequence number. If the sequence numbers are equal, that is
|
318 | e8d4e5ff | Jeff Cody | * invalid */
|
319 | e8d4e5ff | Jeff Cody | if (h1_seq > h2_seq) {
|
320 | e8d4e5ff | Jeff Cody | s->curr_header = 0;
|
321 | e8d4e5ff | Jeff Cody | } else if (h2_seq > h1_seq) { |
322 | e8d4e5ff | Jeff Cody | s->curr_header = 1;
|
323 | e8d4e5ff | Jeff Cody | } else {
|
324 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
325 | e8d4e5ff | Jeff Cody | goto fail;
|
326 | e8d4e5ff | Jeff Cody | } |
327 | e8d4e5ff | Jeff Cody | } |
328 | e8d4e5ff | Jeff Cody | |
329 | e8d4e5ff | Jeff Cody | ret = 0;
|
330 | e8d4e5ff | Jeff Cody | |
331 | e8d4e5ff | Jeff Cody | goto exit;
|
332 | e8d4e5ff | Jeff Cody | |
333 | e8d4e5ff | Jeff Cody | fail:
|
334 | e8d4e5ff | Jeff Cody | qerror_report(ERROR_CLASS_GENERIC_ERROR, "No valid VHDX header found");
|
335 | e8d4e5ff | Jeff Cody | qemu_vfree(header1); |
336 | e8d4e5ff | Jeff Cody | qemu_vfree(header2); |
337 | e8d4e5ff | Jeff Cody | s->headers[0] = NULL; |
338 | e8d4e5ff | Jeff Cody | s->headers[1] = NULL; |
339 | e8d4e5ff | Jeff Cody | exit:
|
340 | e8d4e5ff | Jeff Cody | qemu_vfree(buffer); |
341 | e8d4e5ff | Jeff Cody | return ret;
|
342 | e8d4e5ff | Jeff Cody | } |
343 | e8d4e5ff | Jeff Cody | |
344 | e8d4e5ff | Jeff Cody | |
345 | e8d4e5ff | Jeff Cody | static int vhdx_open_region_tables(BlockDriverState *bs, BDRVVHDXState *s) |
346 | e8d4e5ff | Jeff Cody | { |
347 | e8d4e5ff | Jeff Cody | int ret = 0; |
348 | e8d4e5ff | Jeff Cody | uint8_t *buffer; |
349 | e8d4e5ff | Jeff Cody | int offset = 0; |
350 | e8d4e5ff | Jeff Cody | VHDXRegionTableEntry rt_entry; |
351 | e8d4e5ff | Jeff Cody | uint32_t i; |
352 | e8d4e5ff | Jeff Cody | bool bat_rt_found = false; |
353 | e8d4e5ff | Jeff Cody | bool metadata_rt_found = false; |
354 | e8d4e5ff | Jeff Cody | |
355 | e8d4e5ff | Jeff Cody | /* We have to read the whole 64KB block, because the crc32 is over the
|
356 | e8d4e5ff | Jeff Cody | * whole block */
|
357 | e8d4e5ff | Jeff Cody | buffer = qemu_blockalign(bs, VHDX_HEADER_BLOCK_SIZE); |
358 | e8d4e5ff | Jeff Cody | |
359 | e8d4e5ff | Jeff Cody | ret = bdrv_pread(bs->file, VHDX_REGION_TABLE_OFFSET, buffer, |
360 | e8d4e5ff | Jeff Cody | VHDX_HEADER_BLOCK_SIZE); |
361 | e8d4e5ff | Jeff Cody | if (ret < 0) { |
362 | e8d4e5ff | Jeff Cody | goto fail;
|
363 | e8d4e5ff | Jeff Cody | } |
364 | e8d4e5ff | Jeff Cody | memcpy(&s->rt, buffer, sizeof(s->rt));
|
365 | e8d4e5ff | Jeff Cody | le32_to_cpus(&s->rt.signature); |
366 | e8d4e5ff | Jeff Cody | le32_to_cpus(&s->rt.checksum); |
367 | e8d4e5ff | Jeff Cody | le32_to_cpus(&s->rt.entry_count); |
368 | e8d4e5ff | Jeff Cody | le32_to_cpus(&s->rt.reserved); |
369 | e8d4e5ff | Jeff Cody | offset += sizeof(s->rt);
|
370 | e8d4e5ff | Jeff Cody | |
371 | e8d4e5ff | Jeff Cody | if (!vhdx_checksum_is_valid(buffer, VHDX_HEADER_BLOCK_SIZE, 4) || |
372 | e8d4e5ff | Jeff Cody | memcmp(&s->rt.signature, "regi", 4)) { |
373 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
374 | e8d4e5ff | Jeff Cody | goto fail;
|
375 | e8d4e5ff | Jeff Cody | } |
376 | e8d4e5ff | Jeff Cody | |
377 | e8d4e5ff | Jeff Cody | /* Per spec, maximum region table entry count is 2047 */
|
378 | e8d4e5ff | Jeff Cody | if (s->rt.entry_count > 2047) { |
379 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
380 | e8d4e5ff | Jeff Cody | goto fail;
|
381 | e8d4e5ff | Jeff Cody | } |
382 | e8d4e5ff | Jeff Cody | |
383 | e8d4e5ff | Jeff Cody | for (i = 0; i < s->rt.entry_count; i++) { |
384 | e8d4e5ff | Jeff Cody | memcpy(&rt_entry, buffer + offset, sizeof(rt_entry));
|
385 | e8d4e5ff | Jeff Cody | offset += sizeof(rt_entry);
|
386 | e8d4e5ff | Jeff Cody | |
387 | e8d4e5ff | Jeff Cody | leguid_to_cpus(&rt_entry.guid); |
388 | e8d4e5ff | Jeff Cody | le64_to_cpus(&rt_entry.file_offset); |
389 | e8d4e5ff | Jeff Cody | le32_to_cpus(&rt_entry.length); |
390 | e8d4e5ff | Jeff Cody | le32_to_cpus(&rt_entry.data_bits); |
391 | e8d4e5ff | Jeff Cody | |
392 | e8d4e5ff | Jeff Cody | /* see if we recognize the entry */
|
393 | e8d4e5ff | Jeff Cody | if (guid_eq(rt_entry.guid, bat_guid)) {
|
394 | e8d4e5ff | Jeff Cody | /* must be unique; if we have already found it this is invalid */
|
395 | e8d4e5ff | Jeff Cody | if (bat_rt_found) {
|
396 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
397 | e8d4e5ff | Jeff Cody | goto fail;
|
398 | e8d4e5ff | Jeff Cody | } |
399 | e8d4e5ff | Jeff Cody | bat_rt_found = true;
|
400 | e8d4e5ff | Jeff Cody | s->bat_rt = rt_entry; |
401 | e8d4e5ff | Jeff Cody | continue;
|
402 | e8d4e5ff | Jeff Cody | } |
403 | e8d4e5ff | Jeff Cody | |
404 | e8d4e5ff | Jeff Cody | if (guid_eq(rt_entry.guid, metadata_guid)) {
|
405 | e8d4e5ff | Jeff Cody | /* must be unique; if we have already found it this is invalid */
|
406 | e8d4e5ff | Jeff Cody | if (metadata_rt_found) {
|
407 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
408 | e8d4e5ff | Jeff Cody | goto fail;
|
409 | e8d4e5ff | Jeff Cody | } |
410 | e8d4e5ff | Jeff Cody | metadata_rt_found = true;
|
411 | e8d4e5ff | Jeff Cody | s->metadata_rt = rt_entry; |
412 | e8d4e5ff | Jeff Cody | continue;
|
413 | e8d4e5ff | Jeff Cody | } |
414 | e8d4e5ff | Jeff Cody | |
415 | e8d4e5ff | Jeff Cody | if (rt_entry.data_bits & VHDX_REGION_ENTRY_REQUIRED) {
|
416 | e8d4e5ff | Jeff Cody | /* cannot read vhdx file - required region table entry that
|
417 | e8d4e5ff | Jeff Cody | * we do not understand. per spec, we must fail to open */
|
418 | e8d4e5ff | Jeff Cody | ret = -ENOTSUP; |
419 | e8d4e5ff | Jeff Cody | goto fail;
|
420 | e8d4e5ff | Jeff Cody | } |
421 | e8d4e5ff | Jeff Cody | } |
422 | e8d4e5ff | Jeff Cody | ret = 0;
|
423 | e8d4e5ff | Jeff Cody | |
424 | e8d4e5ff | Jeff Cody | fail:
|
425 | e8d4e5ff | Jeff Cody | qemu_vfree(buffer); |
426 | e8d4e5ff | Jeff Cody | return ret;
|
427 | e8d4e5ff | Jeff Cody | } |
428 | e8d4e5ff | Jeff Cody | |
429 | e8d4e5ff | Jeff Cody | |
430 | e8d4e5ff | Jeff Cody | |
431 | e8d4e5ff | Jeff Cody | /* Metadata initial parser
|
432 | e8d4e5ff | Jeff Cody | *
|
433 | e8d4e5ff | Jeff Cody | * This loads all the metadata entry fields. This may cause additional
|
434 | e8d4e5ff | Jeff Cody | * fields to be processed (e.g. parent locator, etc..).
|
435 | e8d4e5ff | Jeff Cody | *
|
436 | e8d4e5ff | Jeff Cody | * There are 5 Metadata items that are always required:
|
437 | e8d4e5ff | Jeff Cody | * - File Parameters (block size, has a parent)
|
438 | e8d4e5ff | Jeff Cody | * - Virtual Disk Size (size, in bytes, of the virtual drive)
|
439 | e8d4e5ff | Jeff Cody | * - Page 83 Data (scsi page 83 guid)
|
440 | e8d4e5ff | Jeff Cody | * - Logical Sector Size (logical sector size in bytes, either 512 or
|
441 | e8d4e5ff | Jeff Cody | * 4096. We only support 512 currently)
|
442 | e8d4e5ff | Jeff Cody | * - Physical Sector Size (512 or 4096)
|
443 | e8d4e5ff | Jeff Cody | *
|
444 | e8d4e5ff | Jeff Cody | * Also, if the File Parameters indicate this is a differencing file,
|
445 | e8d4e5ff | Jeff Cody | * we must also look for the Parent Locator metadata item.
|
446 | e8d4e5ff | Jeff Cody | */
|
447 | e8d4e5ff | Jeff Cody | static int vhdx_parse_metadata(BlockDriverState *bs, BDRVVHDXState *s) |
448 | e8d4e5ff | Jeff Cody | { |
449 | e8d4e5ff | Jeff Cody | int ret = 0; |
450 | e8d4e5ff | Jeff Cody | uint8_t *buffer; |
451 | e8d4e5ff | Jeff Cody | int offset = 0; |
452 | e8d4e5ff | Jeff Cody | uint32_t i = 0;
|
453 | e8d4e5ff | Jeff Cody | VHDXMetadataTableEntry md_entry; |
454 | e8d4e5ff | Jeff Cody | |
455 | e8d4e5ff | Jeff Cody | buffer = qemu_blockalign(bs, VHDX_METADATA_TABLE_MAX_SIZE); |
456 | e8d4e5ff | Jeff Cody | |
457 | e8d4e5ff | Jeff Cody | ret = bdrv_pread(bs->file, s->metadata_rt.file_offset, buffer, |
458 | e8d4e5ff | Jeff Cody | VHDX_METADATA_TABLE_MAX_SIZE); |
459 | e8d4e5ff | Jeff Cody | if (ret < 0) { |
460 | e8d4e5ff | Jeff Cody | goto exit;
|
461 | e8d4e5ff | Jeff Cody | } |
462 | e8d4e5ff | Jeff Cody | memcpy(&s->metadata_hdr, buffer, sizeof(s->metadata_hdr));
|
463 | e8d4e5ff | Jeff Cody | offset += sizeof(s->metadata_hdr);
|
464 | e8d4e5ff | Jeff Cody | |
465 | e8d4e5ff | Jeff Cody | le64_to_cpus(&s->metadata_hdr.signature); |
466 | e8d4e5ff | Jeff Cody | le16_to_cpus(&s->metadata_hdr.reserved); |
467 | e8d4e5ff | Jeff Cody | le16_to_cpus(&s->metadata_hdr.entry_count); |
468 | e8d4e5ff | Jeff Cody | |
469 | e8d4e5ff | Jeff Cody | if (memcmp(&s->metadata_hdr.signature, "metadata", 8)) { |
470 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
471 | e8d4e5ff | Jeff Cody | goto exit;
|
472 | e8d4e5ff | Jeff Cody | } |
473 | e8d4e5ff | Jeff Cody | |
474 | e8d4e5ff | Jeff Cody | s->metadata_entries.present = 0;
|
475 | e8d4e5ff | Jeff Cody | |
476 | e8d4e5ff | Jeff Cody | if ((s->metadata_hdr.entry_count * sizeof(md_entry)) > |
477 | e8d4e5ff | Jeff Cody | (VHDX_METADATA_TABLE_MAX_SIZE - offset)) { |
478 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
479 | e8d4e5ff | Jeff Cody | goto exit;
|
480 | e8d4e5ff | Jeff Cody | } |
481 | e8d4e5ff | Jeff Cody | |
482 | e8d4e5ff | Jeff Cody | for (i = 0; i < s->metadata_hdr.entry_count; i++) { |
483 | e8d4e5ff | Jeff Cody | memcpy(&md_entry, buffer + offset, sizeof(md_entry));
|
484 | e8d4e5ff | Jeff Cody | offset += sizeof(md_entry);
|
485 | e8d4e5ff | Jeff Cody | |
486 | e8d4e5ff | Jeff Cody | leguid_to_cpus(&md_entry.item_id); |
487 | e8d4e5ff | Jeff Cody | le32_to_cpus(&md_entry.offset); |
488 | e8d4e5ff | Jeff Cody | le32_to_cpus(&md_entry.length); |
489 | e8d4e5ff | Jeff Cody | le32_to_cpus(&md_entry.data_bits); |
490 | e8d4e5ff | Jeff Cody | le32_to_cpus(&md_entry.reserved2); |
491 | e8d4e5ff | Jeff Cody | |
492 | e8d4e5ff | Jeff Cody | if (guid_eq(md_entry.item_id, file_param_guid)) {
|
493 | e8d4e5ff | Jeff Cody | if (s->metadata_entries.present & META_FILE_PARAMETER_PRESENT) {
|
494 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
495 | e8d4e5ff | Jeff Cody | goto exit;
|
496 | e8d4e5ff | Jeff Cody | } |
497 | e8d4e5ff | Jeff Cody | s->metadata_entries.file_parameters_entry = md_entry; |
498 | e8d4e5ff | Jeff Cody | s->metadata_entries.present |= META_FILE_PARAMETER_PRESENT; |
499 | e8d4e5ff | Jeff Cody | continue;
|
500 | e8d4e5ff | Jeff Cody | } |
501 | e8d4e5ff | Jeff Cody | |
502 | e8d4e5ff | Jeff Cody | if (guid_eq(md_entry.item_id, virtual_size_guid)) {
|
503 | e8d4e5ff | Jeff Cody | if (s->metadata_entries.present & META_VIRTUAL_DISK_SIZE_PRESENT) {
|
504 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
505 | e8d4e5ff | Jeff Cody | goto exit;
|
506 | e8d4e5ff | Jeff Cody | } |
507 | e8d4e5ff | Jeff Cody | s->metadata_entries.virtual_disk_size_entry = md_entry; |
508 | e8d4e5ff | Jeff Cody | s->metadata_entries.present |= META_VIRTUAL_DISK_SIZE_PRESENT; |
509 | e8d4e5ff | Jeff Cody | continue;
|
510 | e8d4e5ff | Jeff Cody | } |
511 | e8d4e5ff | Jeff Cody | |
512 | e8d4e5ff | Jeff Cody | if (guid_eq(md_entry.item_id, page83_guid)) {
|
513 | e8d4e5ff | Jeff Cody | if (s->metadata_entries.present & META_PAGE_83_PRESENT) {
|
514 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
515 | e8d4e5ff | Jeff Cody | goto exit;
|
516 | e8d4e5ff | Jeff Cody | } |
517 | e8d4e5ff | Jeff Cody | s->metadata_entries.page83_data_entry = md_entry; |
518 | e8d4e5ff | Jeff Cody | s->metadata_entries.present |= META_PAGE_83_PRESENT; |
519 | e8d4e5ff | Jeff Cody | continue;
|
520 | e8d4e5ff | Jeff Cody | } |
521 | e8d4e5ff | Jeff Cody | |
522 | e8d4e5ff | Jeff Cody | if (guid_eq(md_entry.item_id, logical_sector_guid)) {
|
523 | e8d4e5ff | Jeff Cody | if (s->metadata_entries.present &
|
524 | e8d4e5ff | Jeff Cody | META_LOGICAL_SECTOR_SIZE_PRESENT) { |
525 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
526 | e8d4e5ff | Jeff Cody | goto exit;
|
527 | e8d4e5ff | Jeff Cody | } |
528 | e8d4e5ff | Jeff Cody | s->metadata_entries.logical_sector_size_entry = md_entry; |
529 | e8d4e5ff | Jeff Cody | s->metadata_entries.present |= META_LOGICAL_SECTOR_SIZE_PRESENT; |
530 | e8d4e5ff | Jeff Cody | continue;
|
531 | e8d4e5ff | Jeff Cody | } |
532 | e8d4e5ff | Jeff Cody | |
533 | e8d4e5ff | Jeff Cody | if (guid_eq(md_entry.item_id, phys_sector_guid)) {
|
534 | e8d4e5ff | Jeff Cody | if (s->metadata_entries.present & META_PHYS_SECTOR_SIZE_PRESENT) {
|
535 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
536 | e8d4e5ff | Jeff Cody | goto exit;
|
537 | e8d4e5ff | Jeff Cody | } |
538 | e8d4e5ff | Jeff Cody | s->metadata_entries.phys_sector_size_entry = md_entry; |
539 | e8d4e5ff | Jeff Cody | s->metadata_entries.present |= META_PHYS_SECTOR_SIZE_PRESENT; |
540 | e8d4e5ff | Jeff Cody | continue;
|
541 | e8d4e5ff | Jeff Cody | } |
542 | e8d4e5ff | Jeff Cody | |
543 | e8d4e5ff | Jeff Cody | if (guid_eq(md_entry.item_id, parent_locator_guid)) {
|
544 | e8d4e5ff | Jeff Cody | if (s->metadata_entries.present & META_PARENT_LOCATOR_PRESENT) {
|
545 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
546 | e8d4e5ff | Jeff Cody | goto exit;
|
547 | e8d4e5ff | Jeff Cody | } |
548 | e8d4e5ff | Jeff Cody | s->metadata_entries.parent_locator_entry = md_entry; |
549 | e8d4e5ff | Jeff Cody | s->metadata_entries.present |= META_PARENT_LOCATOR_PRESENT; |
550 | e8d4e5ff | Jeff Cody | continue;
|
551 | e8d4e5ff | Jeff Cody | } |
552 | e8d4e5ff | Jeff Cody | |
553 | e8d4e5ff | Jeff Cody | if (md_entry.data_bits & VHDX_META_FLAGS_IS_REQUIRED) {
|
554 | e8d4e5ff | Jeff Cody | /* cannot read vhdx file - required region table entry that
|
555 | e8d4e5ff | Jeff Cody | * we do not understand. per spec, we must fail to open */
|
556 | e8d4e5ff | Jeff Cody | ret = -ENOTSUP; |
557 | e8d4e5ff | Jeff Cody | goto exit;
|
558 | e8d4e5ff | Jeff Cody | } |
559 | e8d4e5ff | Jeff Cody | } |
560 | e8d4e5ff | Jeff Cody | |
561 | e8d4e5ff | Jeff Cody | if (s->metadata_entries.present != META_ALL_PRESENT) {
|
562 | e8d4e5ff | Jeff Cody | ret = -ENOTSUP; |
563 | e8d4e5ff | Jeff Cody | goto exit;
|
564 | e8d4e5ff | Jeff Cody | } |
565 | e8d4e5ff | Jeff Cody | |
566 | e8d4e5ff | Jeff Cody | ret = bdrv_pread(bs->file, |
567 | e8d4e5ff | Jeff Cody | s->metadata_entries.file_parameters_entry.offset |
568 | e8d4e5ff | Jeff Cody | + s->metadata_rt.file_offset, |
569 | e8d4e5ff | Jeff Cody | &s->params, |
570 | e8d4e5ff | Jeff Cody | sizeof(s->params));
|
571 | e8d4e5ff | Jeff Cody | |
572 | e8d4e5ff | Jeff Cody | if (ret < 0) { |
573 | e8d4e5ff | Jeff Cody | goto exit;
|
574 | e8d4e5ff | Jeff Cody | } |
575 | e8d4e5ff | Jeff Cody | |
576 | e8d4e5ff | Jeff Cody | le32_to_cpus(&s->params.block_size); |
577 | e8d4e5ff | Jeff Cody | le32_to_cpus(&s->params.data_bits); |
578 | e8d4e5ff | Jeff Cody | |
579 | e8d4e5ff | Jeff Cody | |
580 | e8d4e5ff | Jeff Cody | /* We now have the file parameters, so we can tell if this is a
|
581 | e8d4e5ff | Jeff Cody | * differencing file (i.e.. has_parent), is dynamic or fixed
|
582 | e8d4e5ff | Jeff Cody | * sized (leave_blocks_allocated), and the block size */
|
583 | e8d4e5ff | Jeff Cody | |
584 | e8d4e5ff | Jeff Cody | /* The parent locator required iff the file parameters has_parent set */
|
585 | e8d4e5ff | Jeff Cody | if (s->params.data_bits & VHDX_PARAMS_HAS_PARENT) {
|
586 | e8d4e5ff | Jeff Cody | if (s->metadata_entries.present & META_PARENT_LOCATOR_PRESENT) {
|
587 | e8d4e5ff | Jeff Cody | /* TODO: parse parent locator fields */
|
588 | e8d4e5ff | Jeff Cody | ret = -ENOTSUP; /* temp, until differencing files are supported */
|
589 | e8d4e5ff | Jeff Cody | goto exit;
|
590 | e8d4e5ff | Jeff Cody | } else {
|
591 | e8d4e5ff | Jeff Cody | /* if has_parent is set, but there is not parent locator present,
|
592 | e8d4e5ff | Jeff Cody | * then that is an invalid combination */
|
593 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
594 | e8d4e5ff | Jeff Cody | goto exit;
|
595 | e8d4e5ff | Jeff Cody | } |
596 | e8d4e5ff | Jeff Cody | } |
597 | e8d4e5ff | Jeff Cody | |
598 | e8d4e5ff | Jeff Cody | /* determine virtual disk size, logical sector size,
|
599 | e8d4e5ff | Jeff Cody | * and phys sector size */
|
600 | e8d4e5ff | Jeff Cody | |
601 | e8d4e5ff | Jeff Cody | ret = bdrv_pread(bs->file, |
602 | e8d4e5ff | Jeff Cody | s->metadata_entries.virtual_disk_size_entry.offset |
603 | e8d4e5ff | Jeff Cody | + s->metadata_rt.file_offset, |
604 | e8d4e5ff | Jeff Cody | &s->virtual_disk_size, |
605 | e8d4e5ff | Jeff Cody | sizeof(uint64_t));
|
606 | e8d4e5ff | Jeff Cody | if (ret < 0) { |
607 | e8d4e5ff | Jeff Cody | goto exit;
|
608 | e8d4e5ff | Jeff Cody | } |
609 | e8d4e5ff | Jeff Cody | ret = bdrv_pread(bs->file, |
610 | e8d4e5ff | Jeff Cody | s->metadata_entries.logical_sector_size_entry.offset |
611 | e8d4e5ff | Jeff Cody | + s->metadata_rt.file_offset, |
612 | e8d4e5ff | Jeff Cody | &s->logical_sector_size, |
613 | e8d4e5ff | Jeff Cody | sizeof(uint32_t));
|
614 | e8d4e5ff | Jeff Cody | if (ret < 0) { |
615 | e8d4e5ff | Jeff Cody | goto exit;
|
616 | e8d4e5ff | Jeff Cody | } |
617 | e8d4e5ff | Jeff Cody | ret = bdrv_pread(bs->file, |
618 | e8d4e5ff | Jeff Cody | s->metadata_entries.phys_sector_size_entry.offset |
619 | e8d4e5ff | Jeff Cody | + s->metadata_rt.file_offset, |
620 | e8d4e5ff | Jeff Cody | &s->physical_sector_size, |
621 | e8d4e5ff | Jeff Cody | sizeof(uint32_t));
|
622 | e8d4e5ff | Jeff Cody | if (ret < 0) { |
623 | e8d4e5ff | Jeff Cody | goto exit;
|
624 | e8d4e5ff | Jeff Cody | } |
625 | e8d4e5ff | Jeff Cody | |
626 | e8d4e5ff | Jeff Cody | le64_to_cpus(&s->virtual_disk_size); |
627 | e8d4e5ff | Jeff Cody | le32_to_cpus(&s->logical_sector_size); |
628 | e8d4e5ff | Jeff Cody | le32_to_cpus(&s->physical_sector_size); |
629 | e8d4e5ff | Jeff Cody | |
630 | e8d4e5ff | Jeff Cody | if (s->logical_sector_size == 0 || s->params.block_size == 0) { |
631 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
632 | e8d4e5ff | Jeff Cody | goto exit;
|
633 | e8d4e5ff | Jeff Cody | } |
634 | e8d4e5ff | Jeff Cody | |
635 | e8d4e5ff | Jeff Cody | /* both block_size and sector_size are guaranteed powers of 2 */
|
636 | e8d4e5ff | Jeff Cody | s->sectors_per_block = s->params.block_size / s->logical_sector_size; |
637 | e8d4e5ff | Jeff Cody | s->chunk_ratio = (VHDX_MAX_SECTORS_PER_BLOCK) * |
638 | e8d4e5ff | Jeff Cody | (uint64_t)s->logical_sector_size / |
639 | e8d4e5ff | Jeff Cody | (uint64_t)s->params.block_size; |
640 | e8d4e5ff | Jeff Cody | |
641 | e8d4e5ff | Jeff Cody | /* These values are ones we will want to use for division / multiplication
|
642 | e8d4e5ff | Jeff Cody | * later on, and they are all guaranteed (per the spec) to be powers of 2,
|
643 | e8d4e5ff | Jeff Cody | * so we can take advantage of that for shift operations during
|
644 | e8d4e5ff | Jeff Cody | * reads/writes */
|
645 | e8d4e5ff | Jeff Cody | if (s->logical_sector_size & (s->logical_sector_size - 1)) { |
646 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
647 | e8d4e5ff | Jeff Cody | goto exit;
|
648 | e8d4e5ff | Jeff Cody | } |
649 | e8d4e5ff | Jeff Cody | if (s->sectors_per_block & (s->sectors_per_block - 1)) { |
650 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
651 | e8d4e5ff | Jeff Cody | goto exit;
|
652 | e8d4e5ff | Jeff Cody | } |
653 | e8d4e5ff | Jeff Cody | if (s->chunk_ratio & (s->chunk_ratio - 1)) { |
654 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
655 | e8d4e5ff | Jeff Cody | goto exit;
|
656 | e8d4e5ff | Jeff Cody | } |
657 | e8d4e5ff | Jeff Cody | s->block_size = s->params.block_size; |
658 | e8d4e5ff | Jeff Cody | if (s->block_size & (s->block_size - 1)) { |
659 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
660 | e8d4e5ff | Jeff Cody | goto exit;
|
661 | e8d4e5ff | Jeff Cody | } |
662 | e8d4e5ff | Jeff Cody | |
663 | e8d4e5ff | Jeff Cody | s->logical_sector_size_bits = 31 - clz32(s->logical_sector_size);
|
664 | e8d4e5ff | Jeff Cody | s->sectors_per_block_bits = 31 - clz32(s->sectors_per_block);
|
665 | e8d4e5ff | Jeff Cody | s->chunk_ratio_bits = 63 - clz64(s->chunk_ratio);
|
666 | e8d4e5ff | Jeff Cody | s->block_size_bits = 31 - clz32(s->block_size);
|
667 | e8d4e5ff | Jeff Cody | |
668 | e8d4e5ff | Jeff Cody | ret = 0;
|
669 | e8d4e5ff | Jeff Cody | |
670 | e8d4e5ff | Jeff Cody | exit:
|
671 | e8d4e5ff | Jeff Cody | qemu_vfree(buffer); |
672 | e8d4e5ff | Jeff Cody | return ret;
|
673 | e8d4e5ff | Jeff Cody | } |
674 | e8d4e5ff | Jeff Cody | |
675 | e8d4e5ff | Jeff Cody | /* Parse the replay log. Per the VHDX spec, if the log is present
|
676 | e8d4e5ff | Jeff Cody | * it must be replayed prior to opening the file, even read-only.
|
677 | e8d4e5ff | Jeff Cody | *
|
678 | e8d4e5ff | Jeff Cody | * If read-only, we must replay the log in RAM (or refuse to open
|
679 | e8d4e5ff | Jeff Cody | * a dirty VHDX file read-only */
|
680 | e8d4e5ff | Jeff Cody | static int vhdx_parse_log(BlockDriverState *bs, BDRVVHDXState *s) |
681 | e8d4e5ff | Jeff Cody | { |
682 | e8d4e5ff | Jeff Cody | int ret = 0; |
683 | e8d4e5ff | Jeff Cody | int i;
|
684 | e8d4e5ff | Jeff Cody | VHDXHeader *hdr; |
685 | e8d4e5ff | Jeff Cody | |
686 | e8d4e5ff | Jeff Cody | hdr = s->headers[s->curr_header]; |
687 | e8d4e5ff | Jeff Cody | |
688 | e8d4e5ff | Jeff Cody | /* either the log guid, or log length is zero,
|
689 | e8d4e5ff | Jeff Cody | * then a replay log is present */
|
690 | e8d4e5ff | Jeff Cody | for (i = 0; i < sizeof(hdr->log_guid.data4); i++) { |
691 | e8d4e5ff | Jeff Cody | ret |= hdr->log_guid.data4[i]; |
692 | e8d4e5ff | Jeff Cody | } |
693 | e8d4e5ff | Jeff Cody | if (hdr->log_guid.data1 == 0 && |
694 | e8d4e5ff | Jeff Cody | hdr->log_guid.data2 == 0 &&
|
695 | e8d4e5ff | Jeff Cody | hdr->log_guid.data3 == 0 &&
|
696 | e8d4e5ff | Jeff Cody | ret == 0) {
|
697 | e8d4e5ff | Jeff Cody | goto exit;
|
698 | e8d4e5ff | Jeff Cody | } |
699 | e8d4e5ff | Jeff Cody | |
700 | e8d4e5ff | Jeff Cody | /* per spec, only log version of 0 is supported */
|
701 | e8d4e5ff | Jeff Cody | if (hdr->log_version != 0) { |
702 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
703 | e8d4e5ff | Jeff Cody | goto exit;
|
704 | e8d4e5ff | Jeff Cody | } |
705 | e8d4e5ff | Jeff Cody | |
706 | e8d4e5ff | Jeff Cody | if (hdr->log_length == 0) { |
707 | e8d4e5ff | Jeff Cody | goto exit;
|
708 | e8d4e5ff | Jeff Cody | } |
709 | e8d4e5ff | Jeff Cody | |
710 | e8d4e5ff | Jeff Cody | /* We currently do not support images with logs to replay */
|
711 | e8d4e5ff | Jeff Cody | ret = -ENOTSUP; |
712 | e8d4e5ff | Jeff Cody | |
713 | e8d4e5ff | Jeff Cody | exit:
|
714 | e8d4e5ff | Jeff Cody | return ret;
|
715 | e8d4e5ff | Jeff Cody | } |
716 | e8d4e5ff | Jeff Cody | |
717 | e8d4e5ff | Jeff Cody | |
718 | e8d4e5ff | Jeff Cody | static int vhdx_open(BlockDriverState *bs, QDict *options, int flags) |
719 | e8d4e5ff | Jeff Cody | { |
720 | e8d4e5ff | Jeff Cody | BDRVVHDXState *s = bs->opaque; |
721 | e8d4e5ff | Jeff Cody | int ret = 0; |
722 | e8d4e5ff | Jeff Cody | uint32_t i; |
723 | e8d4e5ff | Jeff Cody | uint64_t signature; |
724 | e8d4e5ff | Jeff Cody | uint32_t data_blocks_cnt, bitmap_blocks_cnt; |
725 | e8d4e5ff | Jeff Cody | |
726 | e8d4e5ff | Jeff Cody | |
727 | e8d4e5ff | Jeff Cody | s->bat = NULL;
|
728 | e8d4e5ff | Jeff Cody | |
729 | e8d4e5ff | Jeff Cody | qemu_co_mutex_init(&s->lock); |
730 | e8d4e5ff | Jeff Cody | |
731 | e8d4e5ff | Jeff Cody | /* validate the file signature */
|
732 | e8d4e5ff | Jeff Cody | ret = bdrv_pread(bs->file, 0, &signature, sizeof(uint64_t)); |
733 | e8d4e5ff | Jeff Cody | if (ret < 0) { |
734 | e8d4e5ff | Jeff Cody | goto fail;
|
735 | e8d4e5ff | Jeff Cody | } |
736 | e8d4e5ff | Jeff Cody | if (memcmp(&signature, "vhdxfile", 8)) { |
737 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
738 | e8d4e5ff | Jeff Cody | goto fail;
|
739 | e8d4e5ff | Jeff Cody | } |
740 | e8d4e5ff | Jeff Cody | |
741 | e8d4e5ff | Jeff Cody | ret = vhdx_parse_header(bs, s); |
742 | e8d4e5ff | Jeff Cody | if (ret) {
|
743 | e8d4e5ff | Jeff Cody | goto fail;
|
744 | e8d4e5ff | Jeff Cody | } |
745 | e8d4e5ff | Jeff Cody | |
746 | e8d4e5ff | Jeff Cody | ret = vhdx_parse_log(bs, s); |
747 | e8d4e5ff | Jeff Cody | if (ret) {
|
748 | e8d4e5ff | Jeff Cody | goto fail;
|
749 | e8d4e5ff | Jeff Cody | } |
750 | e8d4e5ff | Jeff Cody | |
751 | e8d4e5ff | Jeff Cody | ret = vhdx_open_region_tables(bs, s); |
752 | e8d4e5ff | Jeff Cody | if (ret) {
|
753 | e8d4e5ff | Jeff Cody | goto fail;
|
754 | e8d4e5ff | Jeff Cody | } |
755 | e8d4e5ff | Jeff Cody | |
756 | e8d4e5ff | Jeff Cody | ret = vhdx_parse_metadata(bs, s); |
757 | e8d4e5ff | Jeff Cody | if (ret) {
|
758 | e8d4e5ff | Jeff Cody | goto fail;
|
759 | e8d4e5ff | Jeff Cody | } |
760 | e8d4e5ff | Jeff Cody | s->block_size = s->params.block_size; |
761 | e8d4e5ff | Jeff Cody | |
762 | e8d4e5ff | Jeff Cody | /* the VHDX spec dictates that virtual_disk_size is always a multiple of
|
763 | e8d4e5ff | Jeff Cody | * logical_sector_size */
|
764 | e8d4e5ff | Jeff Cody | bs->total_sectors = s->virtual_disk_size >> s->logical_sector_size_bits; |
765 | e8d4e5ff | Jeff Cody | |
766 | e8d4e5ff | Jeff Cody | data_blocks_cnt = s->virtual_disk_size >> s->block_size_bits; |
767 | e8d4e5ff | Jeff Cody | if (s->virtual_disk_size - (data_blocks_cnt << s->block_size_bits)) {
|
768 | e8d4e5ff | Jeff Cody | data_blocks_cnt++; |
769 | e8d4e5ff | Jeff Cody | } |
770 | e8d4e5ff | Jeff Cody | bitmap_blocks_cnt = data_blocks_cnt >> s->chunk_ratio_bits; |
771 | e8d4e5ff | Jeff Cody | if (data_blocks_cnt - (bitmap_blocks_cnt << s->chunk_ratio_bits)) {
|
772 | e8d4e5ff | Jeff Cody | bitmap_blocks_cnt++; |
773 | e8d4e5ff | Jeff Cody | } |
774 | e8d4e5ff | Jeff Cody | |
775 | e8d4e5ff | Jeff Cody | if (s->parent_entries) {
|
776 | e8d4e5ff | Jeff Cody | s->bat_entries = bitmap_blocks_cnt * (s->chunk_ratio + 1);
|
777 | e8d4e5ff | Jeff Cody | } else {
|
778 | e8d4e5ff | Jeff Cody | s->bat_entries = data_blocks_cnt + |
779 | e8d4e5ff | Jeff Cody | ((data_blocks_cnt - 1) >> s->chunk_ratio_bits);
|
780 | e8d4e5ff | Jeff Cody | } |
781 | e8d4e5ff | Jeff Cody | |
782 | e8d4e5ff | Jeff Cody | s->bat_offset = s->bat_rt.file_offset; |
783 | e8d4e5ff | Jeff Cody | |
784 | e8d4e5ff | Jeff Cody | if (s->bat_entries > s->bat_rt.length / sizeof(VHDXBatEntry)) { |
785 | e8d4e5ff | Jeff Cody | /* BAT allocation is not large enough for all entries */
|
786 | e8d4e5ff | Jeff Cody | ret = -EINVAL; |
787 | e8d4e5ff | Jeff Cody | goto fail;
|
788 | e8d4e5ff | Jeff Cody | } |
789 | e8d4e5ff | Jeff Cody | |
790 | e8d4e5ff | Jeff Cody | s->bat = qemu_blockalign(bs, s->bat_rt.length); |
791 | e8d4e5ff | Jeff Cody | |
792 | e8d4e5ff | Jeff Cody | ret = bdrv_pread(bs->file, s->bat_offset, s->bat, s->bat_rt.length); |
793 | e8d4e5ff | Jeff Cody | if (ret < 0) { |
794 | e8d4e5ff | Jeff Cody | goto fail;
|
795 | e8d4e5ff | Jeff Cody | } |
796 | e8d4e5ff | Jeff Cody | |
797 | e8d4e5ff | Jeff Cody | for (i = 0; i < s->bat_entries; i++) { |
798 | e8d4e5ff | Jeff Cody | le64_to_cpus(&s->bat[i]); |
799 | e8d4e5ff | Jeff Cody | } |
800 | e8d4e5ff | Jeff Cody | |
801 | e8d4e5ff | Jeff Cody | if (flags & BDRV_O_RDWR) {
|
802 | e8d4e5ff | Jeff Cody | ret = -ENOTSUP; |
803 | e8d4e5ff | Jeff Cody | goto fail;
|
804 | e8d4e5ff | Jeff Cody | } |
805 | e8d4e5ff | Jeff Cody | |
806 | 059e2fbb | Jeff Cody | /* TODO: differencing files, write */
|
807 | e8d4e5ff | Jeff Cody | |
808 | e8d4e5ff | Jeff Cody | return 0; |
809 | e8d4e5ff | Jeff Cody | fail:
|
810 | e8d4e5ff | Jeff Cody | qemu_vfree(s->headers[0]);
|
811 | e8d4e5ff | Jeff Cody | qemu_vfree(s->headers[1]);
|
812 | e8d4e5ff | Jeff Cody | qemu_vfree(s->bat); |
813 | e8d4e5ff | Jeff Cody | qemu_vfree(s->parent_entries); |
814 | e8d4e5ff | Jeff Cody | return ret;
|
815 | e8d4e5ff | Jeff Cody | } |
816 | e8d4e5ff | Jeff Cody | |
817 | e8d4e5ff | Jeff Cody | static int vhdx_reopen_prepare(BDRVReopenState *state, |
818 | e8d4e5ff | Jeff Cody | BlockReopenQueue *queue, Error **errp) |
819 | e8d4e5ff | Jeff Cody | { |
820 | e8d4e5ff | Jeff Cody | return 0; |
821 | e8d4e5ff | Jeff Cody | } |
822 | e8d4e5ff | Jeff Cody | |
823 | e8d4e5ff | Jeff Cody | |
824 | 059e2fbb | Jeff Cody | /*
|
825 | 059e2fbb | Jeff Cody | * Perform sector to block offset translations, to get various
|
826 | 059e2fbb | Jeff Cody | * sector and file offsets into the image. See VHDXSectorInfo
|
827 | 059e2fbb | Jeff Cody | */
|
828 | 059e2fbb | Jeff Cody | static void vhdx_block_translate(BDRVVHDXState *s, int64_t sector_num, |
829 | 059e2fbb | Jeff Cody | int nb_sectors, VHDXSectorInfo *sinfo)
|
830 | 059e2fbb | Jeff Cody | { |
831 | 059e2fbb | Jeff Cody | uint32_t block_offset; |
832 | 059e2fbb | Jeff Cody | |
833 | 059e2fbb | Jeff Cody | sinfo->bat_idx = sector_num >> s->sectors_per_block_bits; |
834 | 059e2fbb | Jeff Cody | /* effectively a modulo - this gives us the offset into the block
|
835 | 059e2fbb | Jeff Cody | * (in sector sizes) for our sector number */
|
836 | 059e2fbb | Jeff Cody | block_offset = sector_num - (sinfo->bat_idx << s->sectors_per_block_bits); |
837 | 059e2fbb | Jeff Cody | /* the chunk ratio gives us the interleaving of the sector
|
838 | 059e2fbb | Jeff Cody | * bitmaps, so we need to advance our page block index by the
|
839 | 059e2fbb | Jeff Cody | * sector bitmaps entry number */
|
840 | 059e2fbb | Jeff Cody | sinfo->bat_idx += sinfo->bat_idx >> s->chunk_ratio_bits; |
841 | 059e2fbb | Jeff Cody | |
842 | 059e2fbb | Jeff Cody | /* the number of sectors we can read/write in this cycle */
|
843 | 059e2fbb | Jeff Cody | sinfo->sectors_avail = s->sectors_per_block - block_offset; |
844 | 059e2fbb | Jeff Cody | |
845 | 059e2fbb | Jeff Cody | sinfo->bytes_left = sinfo->sectors_avail << s->logical_sector_size_bits; |
846 | 059e2fbb | Jeff Cody | |
847 | 059e2fbb | Jeff Cody | if (sinfo->sectors_avail > nb_sectors) {
|
848 | 059e2fbb | Jeff Cody | sinfo->sectors_avail = nb_sectors; |
849 | 059e2fbb | Jeff Cody | } |
850 | 059e2fbb | Jeff Cody | |
851 | 059e2fbb | Jeff Cody | sinfo->bytes_avail = sinfo->sectors_avail << s->logical_sector_size_bits; |
852 | 059e2fbb | Jeff Cody | |
853 | 059e2fbb | Jeff Cody | sinfo->file_offset = s->bat[sinfo->bat_idx] >> VHDX_BAT_FILE_OFF_BITS; |
854 | 059e2fbb | Jeff Cody | |
855 | 059e2fbb | Jeff Cody | sinfo->block_offset = block_offset << s->logical_sector_size_bits; |
856 | 059e2fbb | Jeff Cody | |
857 | 059e2fbb | Jeff Cody | /* The file offset must be past the header section, so must be > 0 */
|
858 | 059e2fbb | Jeff Cody | if (sinfo->file_offset == 0) { |
859 | 059e2fbb | Jeff Cody | return;
|
860 | 059e2fbb | Jeff Cody | } |
861 | 059e2fbb | Jeff Cody | |
862 | 059e2fbb | Jeff Cody | /* block offset is the offset in vhdx logical sectors, in
|
863 | 059e2fbb | Jeff Cody | * the payload data block. Convert that to a byte offset
|
864 | 059e2fbb | Jeff Cody | * in the block, and add in the payload data block offset
|
865 | 059e2fbb | Jeff Cody | * in the file, in bytes, to get the final read address */
|
866 | 059e2fbb | Jeff Cody | |
867 | 059e2fbb | Jeff Cody | sinfo->file_offset <<= 20; /* now in bytes, rather than 1MB units */ |
868 | 059e2fbb | Jeff Cody | sinfo->file_offset += sinfo->block_offset; |
869 | 059e2fbb | Jeff Cody | } |
870 | 059e2fbb | Jeff Cody | |
871 | 059e2fbb | Jeff Cody | |
872 | 059e2fbb | Jeff Cody | |
873 | e8d4e5ff | Jeff Cody | static coroutine_fn int vhdx_co_readv(BlockDriverState *bs, int64_t sector_num, |
874 | e8d4e5ff | Jeff Cody | int nb_sectors, QEMUIOVector *qiov)
|
875 | e8d4e5ff | Jeff Cody | { |
876 | 059e2fbb | Jeff Cody | BDRVVHDXState *s = bs->opaque; |
877 | 059e2fbb | Jeff Cody | int ret = 0; |
878 | 059e2fbb | Jeff Cody | VHDXSectorInfo sinfo; |
879 | 059e2fbb | Jeff Cody | uint64_t bytes_done = 0;
|
880 | 059e2fbb | Jeff Cody | QEMUIOVector hd_qiov; |
881 | 059e2fbb | Jeff Cody | |
882 | 059e2fbb | Jeff Cody | qemu_iovec_init(&hd_qiov, qiov->niov); |
883 | 059e2fbb | Jeff Cody | |
884 | 059e2fbb | Jeff Cody | qemu_co_mutex_lock(&s->lock); |
885 | 059e2fbb | Jeff Cody | |
886 | 059e2fbb | Jeff Cody | while (nb_sectors > 0) { |
887 | 059e2fbb | Jeff Cody | /* We are a differencing file, so we need to inspect the sector bitmap
|
888 | 059e2fbb | Jeff Cody | * to see if we have the data or not */
|
889 | 059e2fbb | Jeff Cody | if (s->params.data_bits & VHDX_PARAMS_HAS_PARENT) {
|
890 | 059e2fbb | Jeff Cody | /* not supported yet */
|
891 | 059e2fbb | Jeff Cody | ret = -ENOTSUP; |
892 | 059e2fbb | Jeff Cody | goto exit;
|
893 | 059e2fbb | Jeff Cody | } else {
|
894 | 059e2fbb | Jeff Cody | vhdx_block_translate(s, sector_num, nb_sectors, &sinfo); |
895 | 059e2fbb | Jeff Cody | |
896 | 059e2fbb | Jeff Cody | qemu_iovec_reset(&hd_qiov); |
897 | 059e2fbb | Jeff Cody | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, sinfo.bytes_avail); |
898 | 059e2fbb | Jeff Cody | |
899 | 059e2fbb | Jeff Cody | /* check the payload block state */
|
900 | 059e2fbb | Jeff Cody | switch (s->bat[sinfo.bat_idx] & VHDX_BAT_STATE_BIT_MASK) {
|
901 | 059e2fbb | Jeff Cody | case PAYLOAD_BLOCK_NOT_PRESENT: /* fall through */ |
902 | 059e2fbb | Jeff Cody | case PAYLOAD_BLOCK_UNDEFINED: /* fall through */ |
903 | 059e2fbb | Jeff Cody | case PAYLOAD_BLOCK_UNMAPPED: /* fall through */ |
904 | 059e2fbb | Jeff Cody | case PAYLOAD_BLOCK_ZERO:
|
905 | 059e2fbb | Jeff Cody | /* return zero */
|
906 | 059e2fbb | Jeff Cody | qemu_iovec_memset(&hd_qiov, 0, 0, sinfo.bytes_avail); |
907 | 059e2fbb | Jeff Cody | break;
|
908 | 059e2fbb | Jeff Cody | case PAYLOAD_BLOCK_FULL_PRESENT:
|
909 | 059e2fbb | Jeff Cody | qemu_co_mutex_unlock(&s->lock); |
910 | 059e2fbb | Jeff Cody | ret = bdrv_co_readv(bs->file, |
911 | 059e2fbb | Jeff Cody | sinfo.file_offset >> BDRV_SECTOR_BITS, |
912 | 059e2fbb | Jeff Cody | sinfo.sectors_avail, &hd_qiov); |
913 | 059e2fbb | Jeff Cody | qemu_co_mutex_lock(&s->lock); |
914 | 059e2fbb | Jeff Cody | if (ret < 0) { |
915 | 059e2fbb | Jeff Cody | goto exit;
|
916 | 059e2fbb | Jeff Cody | } |
917 | 059e2fbb | Jeff Cody | break;
|
918 | 059e2fbb | Jeff Cody | case PAYLOAD_BLOCK_PARTIALLY_PRESENT:
|
919 | 059e2fbb | Jeff Cody | /* we don't yet support difference files, fall through
|
920 | 059e2fbb | Jeff Cody | * to error */
|
921 | 059e2fbb | Jeff Cody | default:
|
922 | 059e2fbb | Jeff Cody | ret = -EIO; |
923 | 059e2fbb | Jeff Cody | goto exit;
|
924 | 059e2fbb | Jeff Cody | break;
|
925 | 059e2fbb | Jeff Cody | } |
926 | 059e2fbb | Jeff Cody | nb_sectors -= sinfo.sectors_avail; |
927 | 059e2fbb | Jeff Cody | sector_num += sinfo.sectors_avail; |
928 | 059e2fbb | Jeff Cody | bytes_done += sinfo.bytes_avail; |
929 | 059e2fbb | Jeff Cody | } |
930 | 059e2fbb | Jeff Cody | } |
931 | 059e2fbb | Jeff Cody | ret = 0;
|
932 | 059e2fbb | Jeff Cody | exit:
|
933 | 059e2fbb | Jeff Cody | qemu_co_mutex_unlock(&s->lock); |
934 | 059e2fbb | Jeff Cody | qemu_iovec_destroy(&hd_qiov); |
935 | 059e2fbb | Jeff Cody | return ret;
|
936 | e8d4e5ff | Jeff Cody | } |
937 | e8d4e5ff | Jeff Cody | |
938 | e8d4e5ff | Jeff Cody | |
939 | e8d4e5ff | Jeff Cody | |
940 | e8d4e5ff | Jeff Cody | static coroutine_fn int vhdx_co_writev(BlockDriverState *bs, int64_t sector_num, |
941 | e8d4e5ff | Jeff Cody | int nb_sectors, QEMUIOVector *qiov)
|
942 | e8d4e5ff | Jeff Cody | { |
943 | e8d4e5ff | Jeff Cody | return -ENOTSUP;
|
944 | e8d4e5ff | Jeff Cody | } |
945 | e8d4e5ff | Jeff Cody | |
946 | e8d4e5ff | Jeff Cody | |
947 | e8d4e5ff | Jeff Cody | static void vhdx_close(BlockDriverState *bs) |
948 | e8d4e5ff | Jeff Cody | { |
949 | e8d4e5ff | Jeff Cody | BDRVVHDXState *s = bs->opaque; |
950 | e8d4e5ff | Jeff Cody | qemu_vfree(s->headers[0]);
|
951 | e8d4e5ff | Jeff Cody | qemu_vfree(s->headers[1]);
|
952 | e8d4e5ff | Jeff Cody | qemu_vfree(s->bat); |
953 | e8d4e5ff | Jeff Cody | qemu_vfree(s->parent_entries); |
954 | e8d4e5ff | Jeff Cody | } |
955 | e8d4e5ff | Jeff Cody | |
956 | e8d4e5ff | Jeff Cody | static BlockDriver bdrv_vhdx = {
|
957 | e8d4e5ff | Jeff Cody | .format_name = "vhdx",
|
958 | e8d4e5ff | Jeff Cody | .instance_size = sizeof(BDRVVHDXState),
|
959 | e8d4e5ff | Jeff Cody | .bdrv_probe = vhdx_probe, |
960 | e8d4e5ff | Jeff Cody | .bdrv_open = vhdx_open, |
961 | e8d4e5ff | Jeff Cody | .bdrv_close = vhdx_close, |
962 | e8d4e5ff | Jeff Cody | .bdrv_reopen_prepare = vhdx_reopen_prepare, |
963 | e8d4e5ff | Jeff Cody | .bdrv_co_readv = vhdx_co_readv, |
964 | e8d4e5ff | Jeff Cody | .bdrv_co_writev = vhdx_co_writev, |
965 | e8d4e5ff | Jeff Cody | }; |
966 | e8d4e5ff | Jeff Cody | |
967 | e8d4e5ff | Jeff Cody | static void bdrv_vhdx_init(void) |
968 | e8d4e5ff | Jeff Cody | { |
969 | e8d4e5ff | Jeff Cody | bdrv_register(&bdrv_vhdx); |
970 | e8d4e5ff | Jeff Cody | } |
971 | e8d4e5ff | Jeff Cody | |
972 | e8d4e5ff | Jeff Cody | block_init(bdrv_vhdx_init); |