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1 | 6a0f9e82 | bellard | /*
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2 | cc2040f8 | Stefan Weil | * Block driver for Connectix / Microsoft Virtual PC images
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3 | 5fafdf24 | ths | *
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4 | 6a0f9e82 | bellard | * Copyright (c) 2005 Alex Beregszaszi
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5 | 15d35bc5 | aliguori | * Copyright (c) 2009 Kevin Wolf <kwolf@suse.de>
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6 | 5fafdf24 | ths | *
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7 | 6a0f9e82 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 | 6a0f9e82 | bellard | * of this software and associated documentation files (the "Software"), to deal
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9 | 6a0f9e82 | bellard | * in the Software without restriction, including without limitation the rights
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10 | 6a0f9e82 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 | 6a0f9e82 | bellard | * copies of the Software, and to permit persons to whom the Software is
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12 | 6a0f9e82 | bellard | * furnished to do so, subject to the following conditions:
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13 | 6a0f9e82 | bellard | *
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14 | 6a0f9e82 | bellard | * The above copyright notice and this permission notice shall be included in
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15 | 6a0f9e82 | bellard | * all copies or substantial portions of the Software.
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16 | 6a0f9e82 | bellard | *
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17 | 6a0f9e82 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 | 6a0f9e82 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 | 6a0f9e82 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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20 | 6a0f9e82 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 | 6a0f9e82 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 | 6a0f9e82 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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23 | 6a0f9e82 | bellard | * THE SOFTWARE.
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24 | 6a0f9e82 | bellard | */
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25 | faf07963 | pbrook | #include "qemu-common.h" |
26 | 737e150e | Paolo Bonzini | #include "block/block_int.h" |
27 | 1de7afc9 | Paolo Bonzini | #include "qemu/module.h" |
28 | caf71f86 | Paolo Bonzini | #include "migration/migration.h" |
29 | 1fe1fa51 | Charles Arnold | #if defined(CONFIG_UUID)
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30 | 1fe1fa51 | Charles Arnold | #include <uuid/uuid.h> |
31 | 1fe1fa51 | Charles Arnold | #endif
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32 | 6a0f9e82 | bellard | |
33 | 6a0f9e82 | bellard | /**************************************************************/
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34 | 6a0f9e82 | bellard | |
35 | 6a0f9e82 | bellard | #define HEADER_SIZE 512 |
36 | 6a0f9e82 | bellard | |
37 | 6a0f9e82 | bellard | //#define CACHE
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38 | 6a0f9e82 | bellard | |
39 | 2cfacb62 | aliguori | enum vhd_type {
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40 | 2cfacb62 | aliguori | VHD_FIXED = 2,
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41 | 2cfacb62 | aliguori | VHD_DYNAMIC = 3,
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42 | 2cfacb62 | aliguori | VHD_DIFFERENCING = 4,
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43 | 2cfacb62 | aliguori | }; |
44 | 2cfacb62 | aliguori | |
45 | 57c7d9e5 | aliguori | // Seconds since Jan 1, 2000 0:00:00 (UTC)
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46 | 57c7d9e5 | aliguori | #define VHD_TIMESTAMP_BASE 946684800 |
47 | 57c7d9e5 | aliguori | |
48 | 6a0f9e82 | bellard | // always big-endian
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49 | b9fa33a6 | aliguori | struct vhd_footer {
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50 | 2cfacb62 | aliguori | char creator[8]; // "conectix" |
51 | 2cfacb62 | aliguori | uint32_t features; |
52 | 2cfacb62 | aliguori | uint32_t version; |
53 | 2cfacb62 | aliguori | |
54 | 2cfacb62 | aliguori | // Offset of next header structure, 0xFFFFFFFF if none
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55 | 2cfacb62 | aliguori | uint64_t data_offset; |
56 | 2cfacb62 | aliguori | |
57 | 2cfacb62 | aliguori | // Seconds since Jan 1, 2000 0:00:00 (UTC)
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58 | 2cfacb62 | aliguori | uint32_t timestamp; |
59 | 2cfacb62 | aliguori | |
60 | 2cfacb62 | aliguori | char creator_app[4]; // "vpc " |
61 | 2cfacb62 | aliguori | uint16_t major; |
62 | 2cfacb62 | aliguori | uint16_t minor; |
63 | 2cfacb62 | aliguori | char creator_os[4]; // "Wi2k" |
64 | 2cfacb62 | aliguori | |
65 | 2cfacb62 | aliguori | uint64_t orig_size; |
66 | 2cfacb62 | aliguori | uint64_t size; |
67 | 2cfacb62 | aliguori | |
68 | 2cfacb62 | aliguori | uint16_t cyls; |
69 | 2cfacb62 | aliguori | uint8_t heads; |
70 | 2cfacb62 | aliguori | uint8_t secs_per_cyl; |
71 | 2cfacb62 | aliguori | |
72 | 2cfacb62 | aliguori | uint32_t type; |
73 | 2cfacb62 | aliguori | |
74 | 2cfacb62 | aliguori | // Checksum of the Hard Disk Footer ("one's complement of the sum of all
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75 | 2cfacb62 | aliguori | // the bytes in the footer without the checksum field")
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76 | 2cfacb62 | aliguori | uint32_t checksum; |
77 | 2cfacb62 | aliguori | |
78 | 2cfacb62 | aliguori | // UUID used to identify a parent hard disk (backing file)
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79 | 2cfacb62 | aliguori | uint8_t uuid[16];
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80 | 2cfacb62 | aliguori | |
81 | 2cfacb62 | aliguori | uint8_t in_saved_state; |
82 | b9fa33a6 | aliguori | }; |
83 | b9fa33a6 | aliguori | |
84 | b9fa33a6 | aliguori | struct vhd_dyndisk_header {
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85 | 2cfacb62 | aliguori | char magic[8]; // "cxsparse" |
86 | 2cfacb62 | aliguori | |
87 | 2cfacb62 | aliguori | // Offset of next header structure, 0xFFFFFFFF if none
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88 | 2cfacb62 | aliguori | uint64_t data_offset; |
89 | 2cfacb62 | aliguori | |
90 | 2cfacb62 | aliguori | // Offset of the Block Allocation Table (BAT)
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91 | 2cfacb62 | aliguori | uint64_t table_offset; |
92 | 2cfacb62 | aliguori | |
93 | 2cfacb62 | aliguori | uint32_t version; |
94 | 2cfacb62 | aliguori | uint32_t max_table_entries; // 32bit/entry
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95 | 2cfacb62 | aliguori | |
96 | 2cfacb62 | aliguori | // 2 MB by default, must be a power of two
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97 | 2cfacb62 | aliguori | uint32_t block_size; |
98 | 2cfacb62 | aliguori | |
99 | 2cfacb62 | aliguori | uint32_t checksum; |
100 | 2cfacb62 | aliguori | uint8_t parent_uuid[16];
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101 | 2cfacb62 | aliguori | uint32_t parent_timestamp; |
102 | 2cfacb62 | aliguori | uint32_t reserved; |
103 | 2cfacb62 | aliguori | |
104 | 2cfacb62 | aliguori | // Backing file name (in UTF-16)
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105 | 2cfacb62 | aliguori | uint8_t parent_name[512];
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106 | 2cfacb62 | aliguori | |
107 | 2cfacb62 | aliguori | struct {
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108 | 2cfacb62 | aliguori | uint32_t platform; |
109 | 2cfacb62 | aliguori | uint32_t data_space; |
110 | 2cfacb62 | aliguori | uint32_t data_length; |
111 | 2cfacb62 | aliguori | uint32_t reserved; |
112 | 2cfacb62 | aliguori | uint64_t data_offset; |
113 | 2cfacb62 | aliguori | } parent_locator[8];
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114 | 6a0f9e82 | bellard | }; |
115 | 6a0f9e82 | bellard | |
116 | 6a0f9e82 | bellard | typedef struct BDRVVPCState { |
117 | 848c66e8 | Paolo Bonzini | CoMutex lock; |
118 | 15d35bc5 | aliguori | uint8_t footer_buf[HEADER_SIZE]; |
119 | 15d35bc5 | aliguori | uint64_t free_data_block_offset; |
120 | 2cfacb62 | aliguori | int max_table_entries;
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121 | 6a0f9e82 | bellard | uint32_t *pagetable; |
122 | 15d35bc5 | aliguori | uint64_t bat_offset; |
123 | 15d35bc5 | aliguori | uint64_t last_bitmap_offset; |
124 | 6a0f9e82 | bellard | |
125 | 2cfacb62 | aliguori | uint32_t block_size; |
126 | 15d35bc5 | aliguori | uint32_t bitmap_size; |
127 | 15d35bc5 | aliguori | |
128 | 6a0f9e82 | bellard | #ifdef CACHE
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129 | 6a0f9e82 | bellard | uint8_t *pageentry_u8; |
130 | 6a0f9e82 | bellard | uint32_t *pageentry_u32; |
131 | 6a0f9e82 | bellard | uint16_t *pageentry_u16; |
132 | 3b46e624 | ths | |
133 | 6a0f9e82 | bellard | uint64_t last_bitmap; |
134 | 6a0f9e82 | bellard | #endif
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135 | 612ff3d8 | Kevin Wolf | |
136 | 612ff3d8 | Kevin Wolf | Error *migration_blocker; |
137 | 6a0f9e82 | bellard | } BDRVVPCState; |
138 | 6a0f9e82 | bellard | |
139 | 57c7d9e5 | aliguori | static uint32_t vpc_checksum(uint8_t* buf, size_t size)
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140 | 57c7d9e5 | aliguori | { |
141 | 57c7d9e5 | aliguori | uint32_t res = 0;
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142 | 57c7d9e5 | aliguori | int i;
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143 | 57c7d9e5 | aliguori | |
144 | 57c7d9e5 | aliguori | for (i = 0; i < size; i++) |
145 | 57c7d9e5 | aliguori | res += buf[i]; |
146 | 57c7d9e5 | aliguori | |
147 | 57c7d9e5 | aliguori | return ~res;
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148 | 57c7d9e5 | aliguori | } |
149 | 57c7d9e5 | aliguori | |
150 | 57c7d9e5 | aliguori | |
151 | 6a0f9e82 | bellard | static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename) |
152 | 6a0f9e82 | bellard | { |
153 | ffe8ab83 | ths | if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8)) |
154 | 6a0f9e82 | bellard | return 100; |
155 | 6a0f9e82 | bellard | return 0; |
156 | 6a0f9e82 | bellard | } |
157 | 6a0f9e82 | bellard | |
158 | 66f82cee | Kevin Wolf | static int vpc_open(BlockDriverState *bs, int flags) |
159 | 6a0f9e82 | bellard | { |
160 | 6a0f9e82 | bellard | BDRVVPCState *s = bs->opaque; |
161 | 66f82cee | Kevin Wolf | int i;
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162 | b9fa33a6 | aliguori | struct vhd_footer* footer;
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163 | b9fa33a6 | aliguori | struct vhd_dyndisk_header* dyndisk_header;
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164 | b9fa33a6 | aliguori | uint8_t buf[HEADER_SIZE]; |
165 | 57c7d9e5 | aliguori | uint32_t checksum; |
166 | efc8243d | Serge E. Hallyn | int err = -1; |
167 | 24da78db | Charles Arnold | int disk_type = VHD_DYNAMIC;
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168 | 6a0f9e82 | bellard | |
169 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, 0, s->footer_buf, HEADER_SIZE) != HEADER_SIZE) |
170 | 6a0f9e82 | bellard | goto fail;
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171 | 6a0f9e82 | bellard | |
172 | 15d35bc5 | aliguori | footer = (struct vhd_footer*) s->footer_buf;
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173 | 24da78db | Charles Arnold | if (strncmp(footer->creator, "conectix", 8)) { |
174 | 24da78db | Charles Arnold | int64_t offset = bdrv_getlength(bs->file); |
175 | 24da78db | Charles Arnold | if (offset < HEADER_SIZE) {
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176 | 24da78db | Charles Arnold | goto fail;
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177 | 24da78db | Charles Arnold | } |
178 | 24da78db | Charles Arnold | /* If a fixed disk, the footer is found only at the end of the file */
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179 | 24da78db | Charles Arnold | if (bdrv_pread(bs->file, offset-HEADER_SIZE, s->footer_buf, HEADER_SIZE)
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180 | 24da78db | Charles Arnold | != HEADER_SIZE) { |
181 | 24da78db | Charles Arnold | goto fail;
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182 | 24da78db | Charles Arnold | } |
183 | 24da78db | Charles Arnold | if (strncmp(footer->creator, "conectix", 8)) { |
184 | 24da78db | Charles Arnold | goto fail;
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185 | 24da78db | Charles Arnold | } |
186 | 24da78db | Charles Arnold | disk_type = VHD_FIXED; |
187 | 24da78db | Charles Arnold | } |
188 | 6a0f9e82 | bellard | |
189 | 57c7d9e5 | aliguori | checksum = be32_to_cpu(footer->checksum); |
190 | 57c7d9e5 | aliguori | footer->checksum = 0;
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191 | 57c7d9e5 | aliguori | if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum)
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192 | 57c7d9e5 | aliguori | fprintf(stderr, "block-vpc: The header checksum of '%s' is "
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193 | 66f82cee | Kevin Wolf | "incorrect.\n", bs->filename);
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194 | 57c7d9e5 | aliguori | |
195 | c088b691 | Zhang Shengju | /* Write 'checksum' back to footer, or else will leave it with zero. */
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196 | c088b691 | Zhang Shengju | footer->checksum = be32_to_cpu(checksum); |
197 | c088b691 | Zhang Shengju | |
198 | 1fa79228 | aliguori | // The visible size of a image in Virtual PC depends on the geometry
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199 | 1fa79228 | aliguori | // rather than on the size stored in the footer (the size in the footer
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200 | 1fa79228 | aliguori | // is too large usually)
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201 | 1fa79228 | aliguori | bs->total_sectors = (int64_t) |
202 | 1fa79228 | aliguori | be16_to_cpu(footer->cyls) * footer->heads * footer->secs_per_cyl; |
203 | 1fa79228 | aliguori | |
204 | 258d2edb | Charles Arnold | /* Allow a maximum disk size of approximately 2 TB */
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205 | 258d2edb | Charles Arnold | if (bs->total_sectors >= 65535LL * 255 * 255) { |
206 | efc8243d | Serge E. Hallyn | err = -EFBIG; |
207 | efc8243d | Serge E. Hallyn | goto fail;
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208 | efc8243d | Serge E. Hallyn | } |
209 | efc8243d | Serge E. Hallyn | |
210 | 24da78db | Charles Arnold | if (disk_type == VHD_DYNAMIC) {
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211 | 24da78db | Charles Arnold | if (bdrv_pread(bs->file, be64_to_cpu(footer->data_offset), buf,
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212 | 24da78db | Charles Arnold | HEADER_SIZE) != HEADER_SIZE) { |
213 | 24da78db | Charles Arnold | goto fail;
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214 | 24da78db | Charles Arnold | } |
215 | b9fa33a6 | aliguori | |
216 | 24da78db | Charles Arnold | dyndisk_header = (struct vhd_dyndisk_header *) buf;
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217 | 6a0f9e82 | bellard | |
218 | 24da78db | Charles Arnold | if (strncmp(dyndisk_header->magic, "cxsparse", 8)) { |
219 | 24da78db | Charles Arnold | goto fail;
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220 | 24da78db | Charles Arnold | } |
221 | 6a0f9e82 | bellard | |
222 | 24da78db | Charles Arnold | s->block_size = be32_to_cpu(dyndisk_header->block_size); |
223 | 24da78db | Charles Arnold | s->bitmap_size = ((s->block_size / (8 * 512)) + 511) & ~511; |
224 | 15d35bc5 | aliguori | |
225 | 24da78db | Charles Arnold | s->max_table_entries = be32_to_cpu(dyndisk_header->max_table_entries); |
226 | 24da78db | Charles Arnold | s->pagetable = g_malloc(s->max_table_entries * 4);
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227 | b71d1c2e | aliguori | |
228 | 24da78db | Charles Arnold | s->bat_offset = be64_to_cpu(dyndisk_header->table_offset); |
229 | 24da78db | Charles Arnold | if (bdrv_pread(bs->file, s->bat_offset, s->pagetable,
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230 | 24da78db | Charles Arnold | s->max_table_entries * 4) != s->max_table_entries * 4) { |
231 | 24da78db | Charles Arnold | goto fail;
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232 | 24da78db | Charles Arnold | } |
233 | b71d1c2e | aliguori | |
234 | 24da78db | Charles Arnold | s->free_data_block_offset = |
235 | 24da78db | Charles Arnold | (s->bat_offset + (s->max_table_entries * 4) + 511) & ~511; |
236 | 15d35bc5 | aliguori | |
237 | 24da78db | Charles Arnold | for (i = 0; i < s->max_table_entries; i++) { |
238 | 24da78db | Charles Arnold | be32_to_cpus(&s->pagetable[i]); |
239 | 24da78db | Charles Arnold | if (s->pagetable[i] != 0xFFFFFFFF) { |
240 | 24da78db | Charles Arnold | int64_t next = (512 * (int64_t) s->pagetable[i]) +
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241 | 24da78db | Charles Arnold | s->bitmap_size + s->block_size; |
242 | 15d35bc5 | aliguori | |
243 | 24da78db | Charles Arnold | if (next > s->free_data_block_offset) {
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244 | 24da78db | Charles Arnold | s->free_data_block_offset = next; |
245 | 24da78db | Charles Arnold | } |
246 | 24da78db | Charles Arnold | } |
247 | 15d35bc5 | aliguori | } |
248 | 15d35bc5 | aliguori | |
249 | 24da78db | Charles Arnold | s->last_bitmap_offset = (int64_t) -1;
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250 | 6a0f9e82 | bellard | |
251 | 6a0f9e82 | bellard | #ifdef CACHE
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252 | 24da78db | Charles Arnold | s->pageentry_u8 = g_malloc(512);
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253 | 24da78db | Charles Arnold | s->pageentry_u32 = s->pageentry_u8; |
254 | 24da78db | Charles Arnold | s->pageentry_u16 = s->pageentry_u8; |
255 | 24da78db | Charles Arnold | s->last_pagetable = -1;
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256 | 6a0f9e82 | bellard | #endif
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257 | 24da78db | Charles Arnold | } |
258 | 6a0f9e82 | bellard | |
259 | 848c66e8 | Paolo Bonzini | qemu_co_mutex_init(&s->lock); |
260 | 612ff3d8 | Kevin Wolf | |
261 | 612ff3d8 | Kevin Wolf | /* Disable migration when VHD images are used */
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262 | 612ff3d8 | Kevin Wolf | error_set(&s->migration_blocker, |
263 | 612ff3d8 | Kevin Wolf | QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED, |
264 | 612ff3d8 | Kevin Wolf | "vpc", bs->device_name, "live migration"); |
265 | 612ff3d8 | Kevin Wolf | migrate_add_blocker(s->migration_blocker); |
266 | 612ff3d8 | Kevin Wolf | |
267 | 6a0f9e82 | bellard | return 0; |
268 | 6a0f9e82 | bellard | fail:
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269 | efc8243d | Serge E. Hallyn | return err;
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270 | 6a0f9e82 | bellard | } |
271 | 6a0f9e82 | bellard | |
272 | 3fe4b700 | Jeff Cody | static int vpc_reopen_prepare(BDRVReopenState *state, |
273 | 3fe4b700 | Jeff Cody | BlockReopenQueue *queue, Error **errp) |
274 | 3fe4b700 | Jeff Cody | { |
275 | 3fe4b700 | Jeff Cody | return 0; |
276 | 3fe4b700 | Jeff Cody | } |
277 | 3fe4b700 | Jeff Cody | |
278 | b71d1c2e | aliguori | /*
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279 | b71d1c2e | aliguori | * Returns the absolute byte offset of the given sector in the image file.
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280 | b71d1c2e | aliguori | * If the sector is not allocated, -1 is returned instead.
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281 | 15d35bc5 | aliguori | *
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282 | 15d35bc5 | aliguori | * The parameter write must be 1 if the offset will be used for a write
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283 | 15d35bc5 | aliguori | * operation (the block bitmaps is updated then), 0 otherwise.
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284 | b71d1c2e | aliguori | */
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285 | 15d35bc5 | aliguori | static inline int64_t get_sector_offset(BlockDriverState *bs, |
286 | 15d35bc5 | aliguori | int64_t sector_num, int write)
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287 | 6a0f9e82 | bellard | { |
288 | 6a0f9e82 | bellard | BDRVVPCState *s = bs->opaque; |
289 | 6a0f9e82 | bellard | uint64_t offset = sector_num * 512;
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290 | 6a0f9e82 | bellard | uint64_t bitmap_offset, block_offset; |
291 | 6a0f9e82 | bellard | uint32_t pagetable_index, pageentry_index; |
292 | 6a0f9e82 | bellard | |
293 | 2cfacb62 | aliguori | pagetable_index = offset / s->block_size; |
294 | 2cfacb62 | aliguori | pageentry_index = (offset % s->block_size) / 512;
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295 | 3b46e624 | ths | |
296 | 15d35bc5 | aliguori | if (pagetable_index >= s->max_table_entries || s->pagetable[pagetable_index] == 0xffffffff) |
297 | 15d35bc5 | aliguori | return -1; // not allocated |
298 | 6a0f9e82 | bellard | |
299 | 378e2aea | aliguori | bitmap_offset = 512 * (uint64_t) s->pagetable[pagetable_index];
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300 | 15d35bc5 | aliguori | block_offset = bitmap_offset + s->bitmap_size + (512 * pageentry_index);
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301 | 15d35bc5 | aliguori | |
302 | 15d35bc5 | aliguori | // We must ensure that we don't write to any sectors which are marked as
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303 | 15d35bc5 | aliguori | // unused in the bitmap. We get away with setting all bits in the block
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304 | 15d35bc5 | aliguori | // bitmap each time we write to a new block. This might cause Virtual PC to
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305 | 15d35bc5 | aliguori | // miss sparse read optimization, but it's not a problem in terms of
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306 | 15d35bc5 | aliguori | // correctness.
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307 | 15d35bc5 | aliguori | if (write && (s->last_bitmap_offset != bitmap_offset)) {
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308 | 15d35bc5 | aliguori | uint8_t bitmap[s->bitmap_size]; |
309 | 15d35bc5 | aliguori | |
310 | 15d35bc5 | aliguori | s->last_bitmap_offset = bitmap_offset; |
311 | 15d35bc5 | aliguori | memset(bitmap, 0xff, s->bitmap_size);
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312 | 078a458e | Kevin Wolf | bdrv_pwrite_sync(bs->file, bitmap_offset, bitmap, s->bitmap_size); |
313 | 15d35bc5 | aliguori | } |
314 | 3b46e624 | ths | |
315 | 26a76461 | bellard | // printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",
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316 | 6a0f9e82 | bellard | // sector_num, pagetable_index, pageentry_index,
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317 | 6a0f9e82 | bellard | // bitmap_offset, block_offset);
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318 | 6a0f9e82 | bellard | |
319 | 6a0f9e82 | bellard | // disabled by reason
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320 | 6a0f9e82 | bellard | #if 0
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321 | 6a0f9e82 | bellard | #ifdef CACHE
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322 | 6a0f9e82 | bellard | if (bitmap_offset != s->last_bitmap)
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323 | 6a0f9e82 | bellard | {
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324 | 6a0f9e82 | bellard | lseek(s->fd, bitmap_offset, SEEK_SET);
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325 | 6a0f9e82 | bellard | |
326 | 6a0f9e82 | bellard | s->last_bitmap = bitmap_offset;
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327 | 5fafdf24 | ths | |
328 | 6a0f9e82 | bellard | // Scary! Bitmap is stored as big endian 32bit entries,
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329 | 6a0f9e82 | bellard | // while we used to look it up byte by byte
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330 | 6a0f9e82 | bellard | read(s->fd, s->pageentry_u8, 512);
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331 | 6a0f9e82 | bellard | for (i = 0; i < 128; i++)
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332 | 6a0f9e82 | bellard | be32_to_cpus(&s->pageentry_u32[i]);
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333 | 6a0f9e82 | bellard | }
|
334 | 6a0f9e82 | bellard | |
335 | 6a0f9e82 | bellard | if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1)
|
336 | 6a0f9e82 | bellard | return -1;
|
337 | 6a0f9e82 | bellard | #else
|
338 | 6a0f9e82 | bellard | lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET);
|
339 | 5fafdf24 | ths | |
340 | 6a0f9e82 | bellard | read(s->fd, &bitmap_entry, 1);
|
341 | 6a0f9e82 | bellard | |
342 | 6a0f9e82 | bellard | if ((bitmap_entry >> (pageentry_index % 8)) & 1) |
343 | 6a0f9e82 | bellard | return -1; // not allocated |
344 | 6a0f9e82 | bellard | #endif
|
345 | 6a0f9e82 | bellard | #endif
|
346 | 6a0f9e82 | bellard | |
347 | b71d1c2e | aliguori | return block_offset;
|
348 | 6a0f9e82 | bellard | } |
349 | 6a0f9e82 | bellard | |
350 | 15d35bc5 | aliguori | /*
|
351 | 15d35bc5 | aliguori | * Writes the footer to the end of the image file. This is needed when the
|
352 | 15d35bc5 | aliguori | * file grows as it overwrites the old footer
|
353 | 15d35bc5 | aliguori | *
|
354 | 15d35bc5 | aliguori | * Returns 0 on success and < 0 on error
|
355 | 15d35bc5 | aliguori | */
|
356 | 15d35bc5 | aliguori | static int rewrite_footer(BlockDriverState* bs) |
357 | 15d35bc5 | aliguori | { |
358 | 15d35bc5 | aliguori | int ret;
|
359 | 15d35bc5 | aliguori | BDRVVPCState *s = bs->opaque; |
360 | 15d35bc5 | aliguori | int64_t offset = s->free_data_block_offset; |
361 | 15d35bc5 | aliguori | |
362 | 078a458e | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, offset, s->footer_buf, HEADER_SIZE); |
363 | 15d35bc5 | aliguori | if (ret < 0) |
364 | 15d35bc5 | aliguori | return ret;
|
365 | 15d35bc5 | aliguori | |
366 | 15d35bc5 | aliguori | return 0; |
367 | 15d35bc5 | aliguori | } |
368 | 15d35bc5 | aliguori | |
369 | 15d35bc5 | aliguori | /*
|
370 | 15d35bc5 | aliguori | * Allocates a new block. This involves writing a new footer and updating
|
371 | 15d35bc5 | aliguori | * the Block Allocation Table to use the space at the old end of the image
|
372 | 15d35bc5 | aliguori | * file (overwriting the old footer)
|
373 | 15d35bc5 | aliguori | *
|
374 | 15d35bc5 | aliguori | * Returns the sectors' offset in the image file on success and < 0 on error
|
375 | 15d35bc5 | aliguori | */
|
376 | 15d35bc5 | aliguori | static int64_t alloc_block(BlockDriverState* bs, int64_t sector_num)
|
377 | 15d35bc5 | aliguori | { |
378 | 15d35bc5 | aliguori | BDRVVPCState *s = bs->opaque; |
379 | 15d35bc5 | aliguori | int64_t bat_offset; |
380 | 15d35bc5 | aliguori | uint32_t index, bat_value; |
381 | 15d35bc5 | aliguori | int ret;
|
382 | 15d35bc5 | aliguori | uint8_t bitmap[s->bitmap_size]; |
383 | 15d35bc5 | aliguori | |
384 | 15d35bc5 | aliguori | // Check if sector_num is valid
|
385 | 15d35bc5 | aliguori | if ((sector_num < 0) || (sector_num > bs->total_sectors)) |
386 | 15d35bc5 | aliguori | return -1; |
387 | 15d35bc5 | aliguori | |
388 | 15d35bc5 | aliguori | // Write entry into in-memory BAT
|
389 | 15d35bc5 | aliguori | index = (sector_num * 512) / s->block_size;
|
390 | 15d35bc5 | aliguori | if (s->pagetable[index] != 0xFFFFFFFF) |
391 | 15d35bc5 | aliguori | return -1; |
392 | 15d35bc5 | aliguori | |
393 | 15d35bc5 | aliguori | s->pagetable[index] = s->free_data_block_offset / 512;
|
394 | 15d35bc5 | aliguori | |
395 | 15d35bc5 | aliguori | // Initialize the block's bitmap
|
396 | 15d35bc5 | aliguori | memset(bitmap, 0xff, s->bitmap_size);
|
397 | 5bb1cbac | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, s->free_data_block_offset, bitmap, |
398 | 078a458e | Kevin Wolf | s->bitmap_size); |
399 | 5bb1cbac | Kevin Wolf | if (ret < 0) { |
400 | 5bb1cbac | Kevin Wolf | return ret;
|
401 | 5bb1cbac | Kevin Wolf | } |
402 | 15d35bc5 | aliguori | |
403 | 15d35bc5 | aliguori | // Write new footer (the old one will be overwritten)
|
404 | 15d35bc5 | aliguori | s->free_data_block_offset += s->block_size + s->bitmap_size; |
405 | 15d35bc5 | aliguori | ret = rewrite_footer(bs); |
406 | 15d35bc5 | aliguori | if (ret < 0) |
407 | 15d35bc5 | aliguori | goto fail;
|
408 | 15d35bc5 | aliguori | |
409 | 15d35bc5 | aliguori | // Write BAT entry to disk
|
410 | 15d35bc5 | aliguori | bat_offset = s->bat_offset + (4 * index);
|
411 | 15d35bc5 | aliguori | bat_value = be32_to_cpu(s->pagetable[index]); |
412 | 078a458e | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, bat_offset, &bat_value, 4);
|
413 | 15d35bc5 | aliguori | if (ret < 0) |
414 | 15d35bc5 | aliguori | goto fail;
|
415 | 15d35bc5 | aliguori | |
416 | 15d35bc5 | aliguori | return get_sector_offset(bs, sector_num, 0); |
417 | 15d35bc5 | aliguori | |
418 | 15d35bc5 | aliguori | fail:
|
419 | 15d35bc5 | aliguori | s->free_data_block_offset -= (s->block_size + s->bitmap_size); |
420 | 15d35bc5 | aliguori | return -1; |
421 | 15d35bc5 | aliguori | } |
422 | 15d35bc5 | aliguori | |
423 | 5fafdf24 | ths | static int vpc_read(BlockDriverState *bs, int64_t sector_num, |
424 | 6a0f9e82 | bellard | uint8_t *buf, int nb_sectors)
|
425 | 6a0f9e82 | bellard | { |
426 | 6c6ea921 | Kevin Wolf | BDRVVPCState *s = bs->opaque; |
427 | 6a0f9e82 | bellard | int ret;
|
428 | b71d1c2e | aliguori | int64_t offset; |
429 | 6c6ea921 | Kevin Wolf | int64_t sectors, sectors_per_block; |
430 | 24da78db | Charles Arnold | struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf; |
431 | 6a0f9e82 | bellard | |
432 | 24da78db | Charles Arnold | if (cpu_to_be32(footer->type) == VHD_FIXED) {
|
433 | 24da78db | Charles Arnold | return bdrv_read(bs->file, sector_num, buf, nb_sectors);
|
434 | 24da78db | Charles Arnold | } |
435 | 6a0f9e82 | bellard | while (nb_sectors > 0) { |
436 | 15d35bc5 | aliguori | offset = get_sector_offset(bs, sector_num, 0);
|
437 | b71d1c2e | aliguori | |
438 | 6c6ea921 | Kevin Wolf | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
439 | 6c6ea921 | Kevin Wolf | sectors = sectors_per_block - (sector_num % sectors_per_block); |
440 | 6c6ea921 | Kevin Wolf | if (sectors > nb_sectors) {
|
441 | 6c6ea921 | Kevin Wolf | sectors = nb_sectors; |
442 | 6c6ea921 | Kevin Wolf | } |
443 | 6c6ea921 | Kevin Wolf | |
444 | b71d1c2e | aliguori | if (offset == -1) { |
445 | 6c6ea921 | Kevin Wolf | memset(buf, 0, sectors * BDRV_SECTOR_SIZE);
|
446 | b71d1c2e | aliguori | } else {
|
447 | 6c6ea921 | Kevin Wolf | ret = bdrv_pread(bs->file, offset, buf, |
448 | 6c6ea921 | Kevin Wolf | sectors * BDRV_SECTOR_SIZE); |
449 | 6c6ea921 | Kevin Wolf | if (ret != sectors * BDRV_SECTOR_SIZE) {
|
450 | b71d1c2e | aliguori | return -1; |
451 | 6c6ea921 | Kevin Wolf | } |
452 | b71d1c2e | aliguori | } |
453 | b71d1c2e | aliguori | |
454 | 6c6ea921 | Kevin Wolf | nb_sectors -= sectors; |
455 | 6c6ea921 | Kevin Wolf | sector_num += sectors; |
456 | 6c6ea921 | Kevin Wolf | buf += sectors * BDRV_SECTOR_SIZE; |
457 | 6a0f9e82 | bellard | } |
458 | 6a0f9e82 | bellard | return 0; |
459 | 6a0f9e82 | bellard | } |
460 | 6a0f9e82 | bellard | |
461 | 2914caa0 | Paolo Bonzini | static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num, |
462 | 2914caa0 | Paolo Bonzini | uint8_t *buf, int nb_sectors)
|
463 | 2914caa0 | Paolo Bonzini | { |
464 | 2914caa0 | Paolo Bonzini | int ret;
|
465 | 2914caa0 | Paolo Bonzini | BDRVVPCState *s = bs->opaque; |
466 | 2914caa0 | Paolo Bonzini | qemu_co_mutex_lock(&s->lock); |
467 | 2914caa0 | Paolo Bonzini | ret = vpc_read(bs, sector_num, buf, nb_sectors); |
468 | 2914caa0 | Paolo Bonzini | qemu_co_mutex_unlock(&s->lock); |
469 | 2914caa0 | Paolo Bonzini | return ret;
|
470 | 2914caa0 | Paolo Bonzini | } |
471 | 2914caa0 | Paolo Bonzini | |
472 | 15d35bc5 | aliguori | static int vpc_write(BlockDriverState *bs, int64_t sector_num, |
473 | 15d35bc5 | aliguori | const uint8_t *buf, int nb_sectors) |
474 | 15d35bc5 | aliguori | { |
475 | 6c6ea921 | Kevin Wolf | BDRVVPCState *s = bs->opaque; |
476 | 15d35bc5 | aliguori | int64_t offset; |
477 | 6c6ea921 | Kevin Wolf | int64_t sectors, sectors_per_block; |
478 | 15d35bc5 | aliguori | int ret;
|
479 | 24da78db | Charles Arnold | struct vhd_footer *footer = (struct vhd_footer *) s->footer_buf; |
480 | 15d35bc5 | aliguori | |
481 | 24da78db | Charles Arnold | if (cpu_to_be32(footer->type) == VHD_FIXED) {
|
482 | 24da78db | Charles Arnold | return bdrv_write(bs->file, sector_num, buf, nb_sectors);
|
483 | 24da78db | Charles Arnold | } |
484 | 15d35bc5 | aliguori | while (nb_sectors > 0) { |
485 | 15d35bc5 | aliguori | offset = get_sector_offset(bs, sector_num, 1);
|
486 | 15d35bc5 | aliguori | |
487 | 6c6ea921 | Kevin Wolf | sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; |
488 | 6c6ea921 | Kevin Wolf | sectors = sectors_per_block - (sector_num % sectors_per_block); |
489 | 6c6ea921 | Kevin Wolf | if (sectors > nb_sectors) {
|
490 | 6c6ea921 | Kevin Wolf | sectors = nb_sectors; |
491 | 6c6ea921 | Kevin Wolf | } |
492 | 6c6ea921 | Kevin Wolf | |
493 | 15d35bc5 | aliguori | if (offset == -1) { |
494 | 15d35bc5 | aliguori | offset = alloc_block(bs, sector_num); |
495 | 15d35bc5 | aliguori | if (offset < 0) |
496 | 15d35bc5 | aliguori | return -1; |
497 | 15d35bc5 | aliguori | } |
498 | 15d35bc5 | aliguori | |
499 | 6c6ea921 | Kevin Wolf | ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE); |
500 | 6c6ea921 | Kevin Wolf | if (ret != sectors * BDRV_SECTOR_SIZE) {
|
501 | 15d35bc5 | aliguori | return -1; |
502 | 6c6ea921 | Kevin Wolf | } |
503 | 15d35bc5 | aliguori | |
504 | 6c6ea921 | Kevin Wolf | nb_sectors -= sectors; |
505 | 6c6ea921 | Kevin Wolf | sector_num += sectors; |
506 | 6c6ea921 | Kevin Wolf | buf += sectors * BDRV_SECTOR_SIZE; |
507 | 15d35bc5 | aliguori | } |
508 | 15d35bc5 | aliguori | |
509 | 15d35bc5 | aliguori | return 0; |
510 | 15d35bc5 | aliguori | } |
511 | 15d35bc5 | aliguori | |
512 | e183ef75 | Paolo Bonzini | static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num, |
513 | e183ef75 | Paolo Bonzini | const uint8_t *buf, int nb_sectors) |
514 | e183ef75 | Paolo Bonzini | { |
515 | e183ef75 | Paolo Bonzini | int ret;
|
516 | e183ef75 | Paolo Bonzini | BDRVVPCState *s = bs->opaque; |
517 | e183ef75 | Paolo Bonzini | qemu_co_mutex_lock(&s->lock); |
518 | e183ef75 | Paolo Bonzini | ret = vpc_write(bs, sector_num, buf, nb_sectors); |
519 | e183ef75 | Paolo Bonzini | qemu_co_mutex_unlock(&s->lock); |
520 | e183ef75 | Paolo Bonzini | return ret;
|
521 | e183ef75 | Paolo Bonzini | } |
522 | e183ef75 | Paolo Bonzini | |
523 | 57c7d9e5 | aliguori | /*
|
524 | 57c7d9e5 | aliguori | * Calculates the number of cylinders, heads and sectors per cylinder
|
525 | 57c7d9e5 | aliguori | * based on a given number of sectors. This is the algorithm described
|
526 | 57c7d9e5 | aliguori | * in the VHD specification.
|
527 | 57c7d9e5 | aliguori | *
|
528 | 57c7d9e5 | aliguori | * Note that the geometry doesn't always exactly match total_sectors but
|
529 | 57c7d9e5 | aliguori | * may round it down.
|
530 | 6e9ea0c0 | aurel32 | *
|
531 | 258d2edb | Charles Arnold | * Returns 0 on success, -EFBIG if the size is larger than ~2 TB. Override
|
532 | 258d2edb | Charles Arnold | * the hardware EIDE and ATA-2 limit of 16 heads (max disk size of 127 GB)
|
533 | 258d2edb | Charles Arnold | * and instead allow up to 255 heads.
|
534 | 57c7d9e5 | aliguori | */
|
535 | 6e9ea0c0 | aurel32 | static int calculate_geometry(int64_t total_sectors, uint16_t* cyls, |
536 | 57c7d9e5 | aliguori | uint8_t* heads, uint8_t* secs_per_cyl) |
537 | 57c7d9e5 | aliguori | { |
538 | 57c7d9e5 | aliguori | uint32_t cyls_times_heads; |
539 | 57c7d9e5 | aliguori | |
540 | 258d2edb | Charles Arnold | /* Allow a maximum disk size of approximately 2 TB */
|
541 | 258d2edb | Charles Arnold | if (total_sectors > 65535LL * 255 * 255) { |
542 | 6e9ea0c0 | aurel32 | return -EFBIG;
|
543 | 258d2edb | Charles Arnold | } |
544 | 57c7d9e5 | aliguori | |
545 | 57c7d9e5 | aliguori | if (total_sectors > 65535 * 16 * 63) { |
546 | 57c7d9e5 | aliguori | *secs_per_cyl = 255;
|
547 | 258d2edb | Charles Arnold | if (total_sectors > 65535 * 16 * 255) { |
548 | 258d2edb | Charles Arnold | *heads = 255;
|
549 | 258d2edb | Charles Arnold | } else {
|
550 | 258d2edb | Charles Arnold | *heads = 16;
|
551 | 258d2edb | Charles Arnold | } |
552 | 57c7d9e5 | aliguori | cyls_times_heads = total_sectors / *secs_per_cyl; |
553 | 57c7d9e5 | aliguori | } else {
|
554 | 57c7d9e5 | aliguori | *secs_per_cyl = 17;
|
555 | 57c7d9e5 | aliguori | cyls_times_heads = total_sectors / *secs_per_cyl; |
556 | 57c7d9e5 | aliguori | *heads = (cyls_times_heads + 1023) / 1024; |
557 | 57c7d9e5 | aliguori | |
558 | 57c7d9e5 | aliguori | if (*heads < 4) |
559 | 57c7d9e5 | aliguori | *heads = 4;
|
560 | 57c7d9e5 | aliguori | |
561 | 57c7d9e5 | aliguori | if (cyls_times_heads >= (*heads * 1024) || *heads > 16) { |
562 | 57c7d9e5 | aliguori | *secs_per_cyl = 31;
|
563 | 57c7d9e5 | aliguori | *heads = 16;
|
564 | 57c7d9e5 | aliguori | cyls_times_heads = total_sectors / *secs_per_cyl; |
565 | 57c7d9e5 | aliguori | } |
566 | 57c7d9e5 | aliguori | |
567 | 57c7d9e5 | aliguori | if (cyls_times_heads >= (*heads * 1024)) { |
568 | 57c7d9e5 | aliguori | *secs_per_cyl = 63;
|
569 | 57c7d9e5 | aliguori | *heads = 16;
|
570 | 57c7d9e5 | aliguori | cyls_times_heads = total_sectors / *secs_per_cyl; |
571 | 57c7d9e5 | aliguori | } |
572 | 57c7d9e5 | aliguori | } |
573 | 57c7d9e5 | aliguori | |
574 | dede4188 | Stefan Weil | *cyls = cyls_times_heads / *heads; |
575 | 6e9ea0c0 | aurel32 | |
576 | 6e9ea0c0 | aurel32 | return 0; |
577 | 57c7d9e5 | aliguori | } |
578 | 57c7d9e5 | aliguori | |
579 | 24da78db | Charles Arnold | static int create_dynamic_disk(int fd, uint8_t *buf, int64_t total_sectors) |
580 | 57c7d9e5 | aliguori | { |
581 | 57c7d9e5 | aliguori | struct vhd_dyndisk_header* dyndisk_header =
|
582 | 57c7d9e5 | aliguori | (struct vhd_dyndisk_header*) buf;
|
583 | 57c7d9e5 | aliguori | size_t block_size, num_bat_entries; |
584 | 24da78db | Charles Arnold | int i;
|
585 | f0ff243a | Blue Swirl | int ret = -EIO;
|
586 | 57c7d9e5 | aliguori | |
587 | 57c7d9e5 | aliguori | // Write the footer (twice: at the beginning and at the end)
|
588 | 57c7d9e5 | aliguori | block_size = 0x200000;
|
589 | 57c7d9e5 | aliguori | num_bat_entries = (total_sectors + block_size / 512) / (block_size / 512); |
590 | 57c7d9e5 | aliguori | |
591 | f0ff243a | Blue Swirl | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
|
592 | f0ff243a | Blue Swirl | goto fail;
|
593 | f0ff243a | Blue Swirl | } |
594 | 57c7d9e5 | aliguori | |
595 | f0ff243a | Blue Swirl | if (lseek(fd, 1536 + ((num_bat_entries * 4 + 511) & ~511), SEEK_SET) < 0) { |
596 | f0ff243a | Blue Swirl | goto fail;
|
597 | f0ff243a | Blue Swirl | } |
598 | f0ff243a | Blue Swirl | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
|
599 | f0ff243a | Blue Swirl | goto fail;
|
600 | f0ff243a | Blue Swirl | } |
601 | 57c7d9e5 | aliguori | |
602 | 57c7d9e5 | aliguori | // Write the initial BAT
|
603 | f0ff243a | Blue Swirl | if (lseek(fd, 3 * 512, SEEK_SET) < 0) { |
604 | f0ff243a | Blue Swirl | goto fail;
|
605 | f0ff243a | Blue Swirl | } |
606 | 57c7d9e5 | aliguori | |
607 | 57c7d9e5 | aliguori | memset(buf, 0xFF, 512); |
608 | f0ff243a | Blue Swirl | for (i = 0; i < (num_bat_entries * 4 + 511) / 512; i++) { |
609 | f0ff243a | Blue Swirl | if (write(fd, buf, 512) != 512) { |
610 | f0ff243a | Blue Swirl | goto fail;
|
611 | f0ff243a | Blue Swirl | } |
612 | f0ff243a | Blue Swirl | } |
613 | 57c7d9e5 | aliguori | |
614 | 57c7d9e5 | aliguori | // Prepare the Dynamic Disk Header
|
615 | 57c7d9e5 | aliguori | memset(buf, 0, 1024); |
616 | 57c7d9e5 | aliguori | |
617 | 5ec4d682 | Nathan Froyd | memcpy(dyndisk_header->magic, "cxsparse", 8); |
618 | 57c7d9e5 | aliguori | |
619 | 78439f6a | Charles Arnold | /*
|
620 | 78439f6a | Charles Arnold | * Note: The spec is actually wrong here for data_offset, it says
|
621 | 78439f6a | Charles Arnold | * 0xFFFFFFFF, but MS tools expect all 64 bits to be set.
|
622 | 78439f6a | Charles Arnold | */
|
623 | 78439f6a | Charles Arnold | dyndisk_header->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL);
|
624 | 57c7d9e5 | aliguori | dyndisk_header->table_offset = be64_to_cpu(3 * 512); |
625 | 57c7d9e5 | aliguori | dyndisk_header->version = be32_to_cpu(0x00010000);
|
626 | 57c7d9e5 | aliguori | dyndisk_header->block_size = be32_to_cpu(block_size); |
627 | 57c7d9e5 | aliguori | dyndisk_header->max_table_entries = be32_to_cpu(num_bat_entries); |
628 | 57c7d9e5 | aliguori | |
629 | 57c7d9e5 | aliguori | dyndisk_header->checksum = be32_to_cpu(vpc_checksum(buf, 1024));
|
630 | 57c7d9e5 | aliguori | |
631 | 57c7d9e5 | aliguori | // Write the header
|
632 | f0ff243a | Blue Swirl | if (lseek(fd, 512, SEEK_SET) < 0) { |
633 | f0ff243a | Blue Swirl | goto fail;
|
634 | f0ff243a | Blue Swirl | } |
635 | 57c7d9e5 | aliguori | |
636 | f0ff243a | Blue Swirl | if (write(fd, buf, 1024) != 1024) { |
637 | f0ff243a | Blue Swirl | goto fail;
|
638 | f0ff243a | Blue Swirl | } |
639 | f0ff243a | Blue Swirl | ret = 0;
|
640 | f0ff243a | Blue Swirl | |
641 | f0ff243a | Blue Swirl | fail:
|
642 | 24da78db | Charles Arnold | return ret;
|
643 | 24da78db | Charles Arnold | } |
644 | 24da78db | Charles Arnold | |
645 | 24da78db | Charles Arnold | static int create_fixed_disk(int fd, uint8_t *buf, int64_t total_size) |
646 | 24da78db | Charles Arnold | { |
647 | 24da78db | Charles Arnold | int ret = -EIO;
|
648 | 24da78db | Charles Arnold | |
649 | 24da78db | Charles Arnold | /* Add footer to total size */
|
650 | 24da78db | Charles Arnold | total_size += 512;
|
651 | 24da78db | Charles Arnold | if (ftruncate(fd, total_size) != 0) { |
652 | 24da78db | Charles Arnold | ret = -errno; |
653 | 24da78db | Charles Arnold | goto fail;
|
654 | 24da78db | Charles Arnold | } |
655 | 24da78db | Charles Arnold | if (lseek(fd, -512, SEEK_END) < 0) { |
656 | 24da78db | Charles Arnold | goto fail;
|
657 | 24da78db | Charles Arnold | } |
658 | 24da78db | Charles Arnold | if (write(fd, buf, HEADER_SIZE) != HEADER_SIZE) {
|
659 | 24da78db | Charles Arnold | goto fail;
|
660 | 24da78db | Charles Arnold | } |
661 | 24da78db | Charles Arnold | |
662 | 24da78db | Charles Arnold | ret = 0;
|
663 | 24da78db | Charles Arnold | |
664 | 24da78db | Charles Arnold | fail:
|
665 | 24da78db | Charles Arnold | return ret;
|
666 | 24da78db | Charles Arnold | } |
667 | 24da78db | Charles Arnold | |
668 | 24da78db | Charles Arnold | static int vpc_create(const char *filename, QEMUOptionParameter *options) |
669 | 24da78db | Charles Arnold | { |
670 | 24da78db | Charles Arnold | uint8_t buf[1024];
|
671 | 24da78db | Charles Arnold | struct vhd_footer *footer = (struct vhd_footer *) buf; |
672 | 24da78db | Charles Arnold | QEMUOptionParameter *disk_type_param; |
673 | 24da78db | Charles Arnold | int fd, i;
|
674 | 24da78db | Charles Arnold | uint16_t cyls = 0;
|
675 | 24da78db | Charles Arnold | uint8_t heads = 0;
|
676 | 24da78db | Charles Arnold | uint8_t secs_per_cyl = 0;
|
677 | 24da78db | Charles Arnold | int64_t total_sectors; |
678 | 24da78db | Charles Arnold | int64_t total_size; |
679 | 24da78db | Charles Arnold | int disk_type;
|
680 | 24da78db | Charles Arnold | int ret = -EIO;
|
681 | 24da78db | Charles Arnold | |
682 | 24da78db | Charles Arnold | /* Read out options */
|
683 | 24da78db | Charles Arnold | total_size = get_option_parameter(options, BLOCK_OPT_SIZE)->value.n; |
684 | 24da78db | Charles Arnold | |
685 | 24da78db | Charles Arnold | disk_type_param = get_option_parameter(options, BLOCK_OPT_SUBFMT); |
686 | 24da78db | Charles Arnold | if (disk_type_param && disk_type_param->value.s) {
|
687 | 24da78db | Charles Arnold | if (!strcmp(disk_type_param->value.s, "dynamic")) { |
688 | 24da78db | Charles Arnold | disk_type = VHD_DYNAMIC; |
689 | 24da78db | Charles Arnold | } else if (!strcmp(disk_type_param->value.s, "fixed")) { |
690 | 24da78db | Charles Arnold | disk_type = VHD_FIXED; |
691 | 24da78db | Charles Arnold | } else {
|
692 | 24da78db | Charles Arnold | return -EINVAL;
|
693 | 24da78db | Charles Arnold | } |
694 | 24da78db | Charles Arnold | } else {
|
695 | 24da78db | Charles Arnold | disk_type = VHD_DYNAMIC; |
696 | 24da78db | Charles Arnold | } |
697 | 24da78db | Charles Arnold | |
698 | 24da78db | Charles Arnold | /* Create the file */
|
699 | 6165f4d8 | Corey Bryant | fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
|
700 | 24da78db | Charles Arnold | if (fd < 0) { |
701 | 24da78db | Charles Arnold | return -EIO;
|
702 | 24da78db | Charles Arnold | } |
703 | 24da78db | Charles Arnold | |
704 | ecd880d9 | Kevin Wolf | /*
|
705 | ecd880d9 | Kevin Wolf | * Calculate matching total_size and geometry. Increase the number of
|
706 | ecd880d9 | Kevin Wolf | * sectors requested until we get enough (or fail). This ensures that
|
707 | ecd880d9 | Kevin Wolf | * qemu-img convert doesn't truncate images, but rather rounds up.
|
708 | ecd880d9 | Kevin Wolf | */
|
709 | 24da78db | Charles Arnold | total_sectors = total_size / BDRV_SECTOR_SIZE; |
710 | ecd880d9 | Kevin Wolf | for (i = 0; total_sectors > (int64_t)cyls * heads * secs_per_cyl; i++) { |
711 | ecd880d9 | Kevin Wolf | if (calculate_geometry(total_sectors + i, &cyls, &heads,
|
712 | ecd880d9 | Kevin Wolf | &secs_per_cyl)) |
713 | ecd880d9 | Kevin Wolf | { |
714 | 24da78db | Charles Arnold | ret = -EFBIG; |
715 | 24da78db | Charles Arnold | goto fail;
|
716 | 24da78db | Charles Arnold | } |
717 | 24da78db | Charles Arnold | } |
718 | ecd880d9 | Kevin Wolf | |
719 | 24da78db | Charles Arnold | total_sectors = (int64_t) cyls * heads * secs_per_cyl; |
720 | 24da78db | Charles Arnold | |
721 | 24da78db | Charles Arnold | /* Prepare the Hard Disk Footer */
|
722 | 24da78db | Charles Arnold | memset(buf, 0, 1024); |
723 | 24da78db | Charles Arnold | |
724 | 24da78db | Charles Arnold | memcpy(footer->creator, "conectix", 8); |
725 | 24da78db | Charles Arnold | /* TODO Check if "qemu" creator_app is ok for VPC */
|
726 | 24da78db | Charles Arnold | memcpy(footer->creator_app, "qemu", 4); |
727 | 24da78db | Charles Arnold | memcpy(footer->creator_os, "Wi2k", 4); |
728 | 24da78db | Charles Arnold | |
729 | 24da78db | Charles Arnold | footer->features = be32_to_cpu(0x02);
|
730 | 24da78db | Charles Arnold | footer->version = be32_to_cpu(0x00010000);
|
731 | 24da78db | Charles Arnold | if (disk_type == VHD_DYNAMIC) {
|
732 | 24da78db | Charles Arnold | footer->data_offset = be64_to_cpu(HEADER_SIZE); |
733 | 24da78db | Charles Arnold | } else {
|
734 | 24da78db | Charles Arnold | footer->data_offset = be64_to_cpu(0xFFFFFFFFFFFFFFFFULL);
|
735 | 24da78db | Charles Arnold | } |
736 | 24da78db | Charles Arnold | footer->timestamp = be32_to_cpu(time(NULL) - VHD_TIMESTAMP_BASE);
|
737 | 24da78db | Charles Arnold | |
738 | 24da78db | Charles Arnold | /* Version of Virtual PC 2007 */
|
739 | 24da78db | Charles Arnold | footer->major = be16_to_cpu(0x0005);
|
740 | 24da78db | Charles Arnold | footer->minor = be16_to_cpu(0x0003);
|
741 | 24da78db | Charles Arnold | if (disk_type == VHD_DYNAMIC) {
|
742 | 24da78db | Charles Arnold | footer->orig_size = be64_to_cpu(total_sectors * 512);
|
743 | 24da78db | Charles Arnold | footer->size = be64_to_cpu(total_sectors * 512);
|
744 | 24da78db | Charles Arnold | } else {
|
745 | 24da78db | Charles Arnold | footer->orig_size = be64_to_cpu(total_size); |
746 | 24da78db | Charles Arnold | footer->size = be64_to_cpu(total_size); |
747 | 24da78db | Charles Arnold | } |
748 | 24da78db | Charles Arnold | footer->cyls = be16_to_cpu(cyls); |
749 | 24da78db | Charles Arnold | footer->heads = heads; |
750 | 24da78db | Charles Arnold | footer->secs_per_cyl = secs_per_cyl; |
751 | 24da78db | Charles Arnold | |
752 | 24da78db | Charles Arnold | footer->type = be32_to_cpu(disk_type); |
753 | 24da78db | Charles Arnold | |
754 | 1fe1fa51 | Charles Arnold | #if defined(CONFIG_UUID)
|
755 | 1fe1fa51 | Charles Arnold | uuid_generate(footer->uuid); |
756 | 1fe1fa51 | Charles Arnold | #endif
|
757 | 24da78db | Charles Arnold | |
758 | 24da78db | Charles Arnold | footer->checksum = be32_to_cpu(vpc_checksum(buf, HEADER_SIZE)); |
759 | 24da78db | Charles Arnold | |
760 | 24da78db | Charles Arnold | if (disk_type == VHD_DYNAMIC) {
|
761 | 24da78db | Charles Arnold | ret = create_dynamic_disk(fd, buf, total_sectors); |
762 | 24da78db | Charles Arnold | } else {
|
763 | 24da78db | Charles Arnold | ret = create_fixed_disk(fd, buf, total_size); |
764 | 24da78db | Charles Arnold | } |
765 | 24da78db | Charles Arnold | |
766 | 24da78db | Charles Arnold | fail:
|
767 | 2e1e79da | Corey Bryant | qemu_close(fd); |
768 | f0ff243a | Blue Swirl | return ret;
|
769 | 57c7d9e5 | aliguori | } |
770 | 57c7d9e5 | aliguori | |
771 | 6a0f9e82 | bellard | static void vpc_close(BlockDriverState *bs) |
772 | 6a0f9e82 | bellard | { |
773 | 6a0f9e82 | bellard | BDRVVPCState *s = bs->opaque; |
774 | 7267c094 | Anthony Liguori | g_free(s->pagetable); |
775 | 6a0f9e82 | bellard | #ifdef CACHE
|
776 | 7267c094 | Anthony Liguori | g_free(s->pageentry_u8); |
777 | 6a0f9e82 | bellard | #endif
|
778 | 612ff3d8 | Kevin Wolf | |
779 | 612ff3d8 | Kevin Wolf | migrate_del_blocker(s->migration_blocker); |
780 | 612ff3d8 | Kevin Wolf | error_free(s->migration_blocker); |
781 | 6a0f9e82 | bellard | } |
782 | 6a0f9e82 | bellard | |
783 | 0e7e1989 | Kevin Wolf | static QEMUOptionParameter vpc_create_options[] = {
|
784 | db08adf5 | Kevin Wolf | { |
785 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_SIZE, |
786 | db08adf5 | Kevin Wolf | .type = OPT_SIZE, |
787 | db08adf5 | Kevin Wolf | .help = "Virtual disk size"
|
788 | db08adf5 | Kevin Wolf | }, |
789 | 24da78db | Charles Arnold | { |
790 | 24da78db | Charles Arnold | .name = BLOCK_OPT_SUBFMT, |
791 | 24da78db | Charles Arnold | .type = OPT_STRING, |
792 | 24da78db | Charles Arnold | .help = |
793 | 24da78db | Charles Arnold | "Type of virtual hard disk format. Supported formats are "
|
794 | 24da78db | Charles Arnold | "{dynamic (default) | fixed} "
|
795 | 24da78db | Charles Arnold | }, |
796 | 0e7e1989 | Kevin Wolf | { NULL }
|
797 | 0e7e1989 | Kevin Wolf | }; |
798 | 0e7e1989 | Kevin Wolf | |
799 | 5efa9d5a | Anthony Liguori | static BlockDriver bdrv_vpc = {
|
800 | 4a411185 | Kevin Wolf | .format_name = "vpc",
|
801 | 4a411185 | Kevin Wolf | .instance_size = sizeof(BDRVVPCState),
|
802 | c68b89ac | Kevin Wolf | |
803 | 4a411185 | Kevin Wolf | .bdrv_probe = vpc_probe, |
804 | 4a411185 | Kevin Wolf | .bdrv_open = vpc_open, |
805 | 4a411185 | Kevin Wolf | .bdrv_close = vpc_close, |
806 | 3fe4b700 | Jeff Cody | .bdrv_reopen_prepare = vpc_reopen_prepare, |
807 | 4a411185 | Kevin Wolf | .bdrv_create = vpc_create, |
808 | 0e7e1989 | Kevin Wolf | |
809 | c68b89ac | Kevin Wolf | .bdrv_read = vpc_co_read, |
810 | c68b89ac | Kevin Wolf | .bdrv_write = vpc_co_write, |
811 | c68b89ac | Kevin Wolf | |
812 | 0e7e1989 | Kevin Wolf | .create_options = vpc_create_options, |
813 | 6a0f9e82 | bellard | }; |
814 | 5efa9d5a | Anthony Liguori | |
815 | 5efa9d5a | Anthony Liguori | static void bdrv_vpc_init(void) |
816 | 5efa9d5a | Anthony Liguori | { |
817 | 5efa9d5a | Anthony Liguori | bdrv_register(&bdrv_vpc); |
818 | 5efa9d5a | Anthony Liguori | } |
819 | 5efa9d5a | Anthony Liguori | |
820 | 5efa9d5a | Anthony Liguori | block_init(bdrv_vpc_init); |