root / block / qcow2.c @ c142442b
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1 | 585f8587 | bellard | /*
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2 | 585f8587 | bellard | * Block driver for the QCOW version 2 format
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3 | 5fafdf24 | ths | *
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4 | 585f8587 | bellard | * Copyright (c) 2004-2006 Fabrice Bellard
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5 | 5fafdf24 | ths | *
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6 | 585f8587 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 585f8587 | bellard | * of this software and associated documentation files (the "Software"), to deal
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8 | 585f8587 | bellard | * in the Software without restriction, including without limitation the rights
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9 | 585f8587 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 585f8587 | bellard | * copies of the Software, and to permit persons to whom the Software is
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11 | 585f8587 | bellard | * furnished to do so, subject to the following conditions:
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12 | 585f8587 | bellard | *
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13 | 585f8587 | bellard | * The above copyright notice and this permission notice shall be included in
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14 | 585f8587 | bellard | * all copies or substantial portions of the Software.
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15 | 585f8587 | bellard | *
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16 | 585f8587 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 585f8587 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 585f8587 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 585f8587 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 585f8587 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 585f8587 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 585f8587 | bellard | * THE SOFTWARE.
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23 | 585f8587 | bellard | */
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24 | faf07963 | pbrook | #include "qemu-common.h" |
25 | 585f8587 | bellard | #include "block_int.h" |
26 | 5efa9d5a | Anthony Liguori | #include "module.h" |
27 | 585f8587 | bellard | #include <zlib.h> |
28 | 585f8587 | bellard | #include "aes.h" |
29 | f7d0fe02 | Kevin Wolf | #include "block/qcow2.h" |
30 | 585f8587 | bellard | |
31 | 585f8587 | bellard | /*
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32 | 585f8587 | bellard | Differences with QCOW:
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33 | 585f8587 | bellard | |
34 | 585f8587 | bellard | - Support for multiple incremental snapshots.
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35 | 585f8587 | bellard | - Memory management by reference counts.
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36 | 585f8587 | bellard | - Clusters which have a reference count of one have the bit
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37 | 585f8587 | bellard | QCOW_OFLAG_COPIED to optimize write performance.
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38 | 5fafdf24 | ths | - Size of compressed clusters is stored in sectors to reduce bit usage
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39 | 585f8587 | bellard | in the cluster offsets.
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40 | 585f8587 | bellard | - Support for storing additional data (such as the VM state) in the
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41 | 3b46e624 | ths | snapshots.
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42 | 585f8587 | bellard | - If a backing store is used, the cluster size is not constrained
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43 | 585f8587 | bellard | (could be backported to QCOW).
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44 | 585f8587 | bellard | - L2 tables have always a size of one cluster.
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45 | 585f8587 | bellard | */
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46 | 585f8587 | bellard | |
47 | 585f8587 | bellard | //#define DEBUG_ALLOC
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48 | 585f8587 | bellard | //#define DEBUG_ALLOC2
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49 | 9b80ddf3 | aliguori | //#define DEBUG_EXT
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50 | 5fafdf24 | ths | |
51 | 9b80ddf3 | aliguori | |
52 | 9b80ddf3 | aliguori | typedef struct { |
53 | 9b80ddf3 | aliguori | uint32_t magic; |
54 | 9b80ddf3 | aliguori | uint32_t len; |
55 | 9b80ddf3 | aliguori | } QCowExtension; |
56 | 9b80ddf3 | aliguori | #define QCOW_EXT_MAGIC_END 0 |
57 | f965509c | aliguori | #define QCOW_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA |
58 | 9b80ddf3 | aliguori | |
59 | 9b80ddf3 | aliguori | |
60 | 585f8587 | bellard | |
61 | 585f8587 | bellard | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) |
62 | 585f8587 | bellard | { |
63 | 585f8587 | bellard | const QCowHeader *cow_header = (const void *)buf; |
64 | 3b46e624 | ths | |
65 | 585f8587 | bellard | if (buf_size >= sizeof(QCowHeader) && |
66 | 585f8587 | bellard | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && |
67 | 5fafdf24 | ths | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
68 | 585f8587 | bellard | return 100; |
69 | 585f8587 | bellard | else
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70 | 585f8587 | bellard | return 0; |
71 | 585f8587 | bellard | } |
72 | 585f8587 | bellard | |
73 | 9b80ddf3 | aliguori | |
74 | 9b80ddf3 | aliguori | /*
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75 | 9b80ddf3 | aliguori | * read qcow2 extension and fill bs
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76 | 9b80ddf3 | aliguori | * start reading from start_offset
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77 | 9b80ddf3 | aliguori | * finish reading upon magic of value 0 or when end_offset reached
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78 | 9b80ddf3 | aliguori | * unknown magic is skipped (future extension this version knows nothing about)
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79 | 9b80ddf3 | aliguori | * return 0 upon success, non-0 otherwise
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80 | 9b80ddf3 | aliguori | */
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81 | 9b80ddf3 | aliguori | static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
82 | 9b80ddf3 | aliguori | uint64_t end_offset) |
83 | 9b80ddf3 | aliguori | { |
84 | 9b80ddf3 | aliguori | BDRVQcowState *s = bs->opaque; |
85 | 9b80ddf3 | aliguori | QCowExtension ext; |
86 | 9b80ddf3 | aliguori | uint64_t offset; |
87 | 9b80ddf3 | aliguori | |
88 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
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89 | 9b80ddf3 | aliguori | printf("qcow_read_extensions: start=%ld end=%ld\n", start_offset, end_offset);
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90 | 9b80ddf3 | aliguori | #endif
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91 | 9b80ddf3 | aliguori | offset = start_offset; |
92 | 9b80ddf3 | aliguori | while (offset < end_offset) {
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93 | 9b80ddf3 | aliguori | |
94 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
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95 | 9b80ddf3 | aliguori | /* Sanity check */
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96 | 9b80ddf3 | aliguori | if (offset > s->cluster_size)
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97 | 9b80ddf3 | aliguori | printf("qcow_handle_extension: suspicious offset %lu\n", offset);
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98 | 9b80ddf3 | aliguori | |
99 | 9b80ddf3 | aliguori | printf("attemting to read extended header in offset %lu\n", offset);
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100 | 9b80ddf3 | aliguori | #endif
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101 | 9b80ddf3 | aliguori | |
102 | 9b80ddf3 | aliguori | if (bdrv_pread(s->hd, offset, &ext, sizeof(ext)) != sizeof(ext)) { |
103 | 4c978075 | aliguori | fprintf(stderr, "qcow_handle_extension: ERROR: pread fail from offset %llu\n",
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104 | 4c978075 | aliguori | (unsigned long long)offset); |
105 | 9b80ddf3 | aliguori | return 1; |
106 | 9b80ddf3 | aliguori | } |
107 | 9b80ddf3 | aliguori | be32_to_cpus(&ext.magic); |
108 | 9b80ddf3 | aliguori | be32_to_cpus(&ext.len); |
109 | 9b80ddf3 | aliguori | offset += sizeof(ext);
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110 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
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111 | 9b80ddf3 | aliguori | printf("ext.magic = 0x%x\n", ext.magic);
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112 | 9b80ddf3 | aliguori | #endif
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113 | 9b80ddf3 | aliguori | switch (ext.magic) {
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114 | 9b80ddf3 | aliguori | case QCOW_EXT_MAGIC_END:
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115 | 9b80ddf3 | aliguori | return 0; |
116 | f965509c | aliguori | |
117 | f965509c | aliguori | case QCOW_EXT_MAGIC_BACKING_FORMAT:
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118 | f965509c | aliguori | if (ext.len >= sizeof(bs->backing_format)) { |
119 | f965509c | aliguori | fprintf(stderr, "ERROR: ext_backing_format: len=%u too large"
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120 | 4c978075 | aliguori | " (>=%zu)\n",
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121 | f965509c | aliguori | ext.len, sizeof(bs->backing_format));
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122 | f965509c | aliguori | return 2; |
123 | f965509c | aliguori | } |
124 | f965509c | aliguori | if (bdrv_pread(s->hd, offset , bs->backing_format,
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125 | f965509c | aliguori | ext.len) != ext.len) |
126 | f965509c | aliguori | return 3; |
127 | f965509c | aliguori | bs->backing_format[ext.len] = '\0';
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128 | f965509c | aliguori | #ifdef DEBUG_EXT
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129 | f965509c | aliguori | printf("Qcow2: Got format extension %s\n", bs->backing_format);
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130 | f965509c | aliguori | #endif
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131 | f965509c | aliguori | offset += ((ext.len + 7) & ~7); |
132 | f965509c | aliguori | break;
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133 | f965509c | aliguori | |
134 | 9b80ddf3 | aliguori | default:
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135 | 9b80ddf3 | aliguori | /* unknown magic -- just skip it */
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136 | 9b80ddf3 | aliguori | offset += ((ext.len + 7) & ~7); |
137 | 9b80ddf3 | aliguori | break;
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138 | 9b80ddf3 | aliguori | } |
139 | 9b80ddf3 | aliguori | } |
140 | 9b80ddf3 | aliguori | |
141 | 9b80ddf3 | aliguori | return 0; |
142 | 9b80ddf3 | aliguori | } |
143 | 9b80ddf3 | aliguori | |
144 | 9b80ddf3 | aliguori | |
145 | 585f8587 | bellard | static int qcow_open(BlockDriverState *bs, const char *filename, int flags) |
146 | 585f8587 | bellard | { |
147 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
148 | 585f8587 | bellard | int len, i, shift, ret;
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149 | 585f8587 | bellard | QCowHeader header; |
150 | 9b80ddf3 | aliguori | uint64_t ext_end; |
151 | 585f8587 | bellard | |
152 | 4dc822d7 | aliguori | /* Performance is terrible right now with cache=writethrough due mainly
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153 | 4dc822d7 | aliguori | * to reference count updates. If the user does not explicitly specify
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154 | 4dc822d7 | aliguori | * a caching type, force to writeback caching.
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155 | 4dc822d7 | aliguori | */
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156 | 4dc822d7 | aliguori | if ((flags & BDRV_O_CACHE_DEF)) {
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157 | 4dc822d7 | aliguori | flags |= BDRV_O_CACHE_WB; |
158 | 4dc822d7 | aliguori | flags &= ~BDRV_O_CACHE_DEF; |
159 | 4dc822d7 | aliguori | } |
160 | b5eff355 | aurel32 | ret = bdrv_file_open(&s->hd, filename, flags); |
161 | 585f8587 | bellard | if (ret < 0) |
162 | 585f8587 | bellard | return ret;
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163 | 585f8587 | bellard | if (bdrv_pread(s->hd, 0, &header, sizeof(header)) != sizeof(header)) |
164 | 585f8587 | bellard | goto fail;
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165 | 585f8587 | bellard | be32_to_cpus(&header.magic); |
166 | 585f8587 | bellard | be32_to_cpus(&header.version); |
167 | 585f8587 | bellard | be64_to_cpus(&header.backing_file_offset); |
168 | 585f8587 | bellard | be32_to_cpus(&header.backing_file_size); |
169 | 585f8587 | bellard | be64_to_cpus(&header.size); |
170 | 585f8587 | bellard | be32_to_cpus(&header.cluster_bits); |
171 | 585f8587 | bellard | be32_to_cpus(&header.crypt_method); |
172 | 585f8587 | bellard | be64_to_cpus(&header.l1_table_offset); |
173 | 585f8587 | bellard | be32_to_cpus(&header.l1_size); |
174 | 585f8587 | bellard | be64_to_cpus(&header.refcount_table_offset); |
175 | 585f8587 | bellard | be32_to_cpus(&header.refcount_table_clusters); |
176 | 585f8587 | bellard | be64_to_cpus(&header.snapshots_offset); |
177 | 585f8587 | bellard | be32_to_cpus(&header.nb_snapshots); |
178 | 3b46e624 | ths | |
179 | 585f8587 | bellard | if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION)
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180 | 585f8587 | bellard | goto fail;
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181 | 5fafdf24 | ths | if (header.size <= 1 || |
182 | 73c632ed | Kevin Wolf | header.cluster_bits < MIN_CLUSTER_BITS || |
183 | 73c632ed | Kevin Wolf | header.cluster_bits > MAX_CLUSTER_BITS) |
184 | 585f8587 | bellard | goto fail;
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185 | 585f8587 | bellard | if (header.crypt_method > QCOW_CRYPT_AES)
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186 | 585f8587 | bellard | goto fail;
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187 | 585f8587 | bellard | s->crypt_method_header = header.crypt_method; |
188 | 585f8587 | bellard | if (s->crypt_method_header)
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189 | 585f8587 | bellard | bs->encrypted = 1;
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190 | 585f8587 | bellard | s->cluster_bits = header.cluster_bits; |
191 | 585f8587 | bellard | s->cluster_size = 1 << s->cluster_bits;
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192 | 585f8587 | bellard | s->cluster_sectors = 1 << (s->cluster_bits - 9); |
193 | 585f8587 | bellard | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ |
194 | 585f8587 | bellard | s->l2_size = 1 << s->l2_bits;
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195 | 585f8587 | bellard | bs->total_sectors = header.size / 512;
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196 | 585f8587 | bellard | s->csize_shift = (62 - (s->cluster_bits - 8)); |
197 | 585f8587 | bellard | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; |
198 | 585f8587 | bellard | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; |
199 | 585f8587 | bellard | s->refcount_table_offset = header.refcount_table_offset; |
200 | 5fafdf24 | ths | s->refcount_table_size = |
201 | 585f8587 | bellard | header.refcount_table_clusters << (s->cluster_bits - 3);
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202 | 585f8587 | bellard | |
203 | 585f8587 | bellard | s->snapshots_offset = header.snapshots_offset; |
204 | 585f8587 | bellard | s->nb_snapshots = header.nb_snapshots; |
205 | 585f8587 | bellard | |
206 | 585f8587 | bellard | /* read the level 1 table */
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207 | 585f8587 | bellard | s->l1_size = header.l1_size; |
208 | 585f8587 | bellard | shift = s->cluster_bits + s->l2_bits; |
209 | 585f8587 | bellard | s->l1_vm_state_index = (header.size + (1LL << shift) - 1) >> shift; |
210 | 585f8587 | bellard | /* the L1 table must contain at least enough entries to put
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211 | 585f8587 | bellard | header.size bytes */
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212 | 585f8587 | bellard | if (s->l1_size < s->l1_vm_state_index)
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213 | 585f8587 | bellard | goto fail;
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214 | 585f8587 | bellard | s->l1_table_offset = header.l1_table_offset; |
215 | 585f8587 | bellard | s->l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t));
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216 | 5fafdf24 | ths | if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) != |
217 | 585f8587 | bellard | s->l1_size * sizeof(uint64_t))
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218 | 585f8587 | bellard | goto fail;
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219 | 585f8587 | bellard | for(i = 0;i < s->l1_size; i++) { |
220 | 585f8587 | bellard | be64_to_cpus(&s->l1_table[i]); |
221 | 585f8587 | bellard | } |
222 | 585f8587 | bellard | /* alloc L2 cache */
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223 | 585f8587 | bellard | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
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224 | 585f8587 | bellard | s->cluster_cache = qemu_malloc(s->cluster_size); |
225 | 585f8587 | bellard | /* one more sector for decompressed data alignment */
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226 | 095a9c58 | aliguori | s->cluster_data = qemu_malloc(QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
227 | 095a9c58 | aliguori | + 512);
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228 | 585f8587 | bellard | s->cluster_cache_offset = -1;
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229 | 3b46e624 | ths | |
230 | 585f8587 | bellard | if (refcount_init(bs) < 0) |
231 | 585f8587 | bellard | goto fail;
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232 | 585f8587 | bellard | |
233 | 9b80ddf3 | aliguori | /* read qcow2 extensions */
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234 | 9b80ddf3 | aliguori | if (header.backing_file_offset)
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235 | 9b80ddf3 | aliguori | ext_end = header.backing_file_offset; |
236 | 9b80ddf3 | aliguori | else
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237 | 9b80ddf3 | aliguori | ext_end = s->cluster_size; |
238 | 9b80ddf3 | aliguori | if (qcow_read_extensions(bs, sizeof(header), ext_end)) |
239 | 9b80ddf3 | aliguori | goto fail;
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240 | 9b80ddf3 | aliguori | |
241 | 585f8587 | bellard | /* read the backing file name */
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242 | 585f8587 | bellard | if (header.backing_file_offset != 0) { |
243 | 585f8587 | bellard | len = header.backing_file_size; |
244 | 585f8587 | bellard | if (len > 1023) |
245 | 585f8587 | bellard | len = 1023;
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246 | 585f8587 | bellard | if (bdrv_pread(s->hd, header.backing_file_offset, bs->backing_file, len) != len)
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247 | 585f8587 | bellard | goto fail;
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248 | 585f8587 | bellard | bs->backing_file[len] = '\0';
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249 | 585f8587 | bellard | } |
250 | 585f8587 | bellard | if (qcow_read_snapshots(bs) < 0) |
251 | 585f8587 | bellard | goto fail;
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252 | 585f8587 | bellard | |
253 | 585f8587 | bellard | #ifdef DEBUG_ALLOC
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254 | 585f8587 | bellard | check_refcounts(bs); |
255 | 585f8587 | bellard | #endif
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256 | 585f8587 | bellard | return 0; |
257 | 585f8587 | bellard | |
258 | 585f8587 | bellard | fail:
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259 | 585f8587 | bellard | qcow_free_snapshots(bs); |
260 | 585f8587 | bellard | refcount_close(bs); |
261 | 585f8587 | bellard | qemu_free(s->l1_table); |
262 | 585f8587 | bellard | qemu_free(s->l2_cache); |
263 | 585f8587 | bellard | qemu_free(s->cluster_cache); |
264 | 585f8587 | bellard | qemu_free(s->cluster_data); |
265 | 585f8587 | bellard | bdrv_delete(s->hd); |
266 | 585f8587 | bellard | return -1; |
267 | 585f8587 | bellard | } |
268 | 585f8587 | bellard | |
269 | 585f8587 | bellard | static int qcow_set_key(BlockDriverState *bs, const char *key) |
270 | 585f8587 | bellard | { |
271 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
272 | 585f8587 | bellard | uint8_t keybuf[16];
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273 | 585f8587 | bellard | int len, i;
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274 | 3b46e624 | ths | |
275 | 585f8587 | bellard | memset(keybuf, 0, 16); |
276 | 585f8587 | bellard | len = strlen(key); |
277 | 585f8587 | bellard | if (len > 16) |
278 | 585f8587 | bellard | len = 16;
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279 | 585f8587 | bellard | /* XXX: we could compress the chars to 7 bits to increase
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280 | 585f8587 | bellard | entropy */
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281 | 585f8587 | bellard | for(i = 0;i < len;i++) { |
282 | 585f8587 | bellard | keybuf[i] = key[i]; |
283 | 585f8587 | bellard | } |
284 | 585f8587 | bellard | s->crypt_method = s->crypt_method_header; |
285 | 585f8587 | bellard | |
286 | 585f8587 | bellard | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) |
287 | 585f8587 | bellard | return -1; |
288 | 585f8587 | bellard | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) |
289 | 585f8587 | bellard | return -1; |
290 | 585f8587 | bellard | #if 0
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291 | 585f8587 | bellard | /* test */
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292 | 585f8587 | bellard | {
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293 | 585f8587 | bellard | uint8_t in[16];
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294 | 585f8587 | bellard | uint8_t out[16];
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295 | 585f8587 | bellard | uint8_t tmp[16];
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296 | 585f8587 | bellard | for(i=0;i<16;i++)
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297 | 585f8587 | bellard | in[i] = i;
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298 | 585f8587 | bellard | AES_encrypt(in, tmp, &s->aes_encrypt_key);
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299 | 585f8587 | bellard | AES_decrypt(tmp, out, &s->aes_decrypt_key);
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300 | 585f8587 | bellard | for(i = 0; i < 16; i++)
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301 | 585f8587 | bellard | printf(" %02x", tmp[i]);
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302 | 585f8587 | bellard | printf("\n");
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303 | 585f8587 | bellard | for(i = 0; i < 16; i++)
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304 | 585f8587 | bellard | printf(" %02x", out[i]);
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305 | 585f8587 | bellard | printf("\n");
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306 | 585f8587 | bellard | }
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307 | 585f8587 | bellard | #endif
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308 | 585f8587 | bellard | return 0; |
309 | 585f8587 | bellard | } |
310 | 585f8587 | bellard | |
311 | 5fafdf24 | ths | static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num, |
312 | 585f8587 | bellard | int nb_sectors, int *pnum) |
313 | 585f8587 | bellard | { |
314 | 585f8587 | bellard | uint64_t cluster_offset; |
315 | 585f8587 | bellard | |
316 | 095a9c58 | aliguori | *pnum = nb_sectors; |
317 | 095a9c58 | aliguori | cluster_offset = get_cluster_offset(bs, sector_num << 9, pnum);
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318 | 095a9c58 | aliguori | |
319 | 585f8587 | bellard | return (cluster_offset != 0); |
320 | 585f8587 | bellard | } |
321 | 585f8587 | bellard | |
322 | a9465922 | bellard | /* handle reading after the end of the backing file */
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323 | 45aba42f | Kevin Wolf | int backing_read1(BlockDriverState *bs,
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324 | 45aba42f | Kevin Wolf | int64_t sector_num, uint8_t *buf, int nb_sectors)
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325 | a9465922 | bellard | { |
326 | a9465922 | bellard | int n1;
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327 | a9465922 | bellard | if ((sector_num + nb_sectors) <= bs->total_sectors)
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328 | a9465922 | bellard | return nb_sectors;
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329 | a9465922 | bellard | if (sector_num >= bs->total_sectors)
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330 | a9465922 | bellard | n1 = 0;
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331 | a9465922 | bellard | else
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332 | a9465922 | bellard | n1 = bs->total_sectors - sector_num; |
333 | a9465922 | bellard | memset(buf + n1 * 512, 0, 512 * (nb_sectors - n1)); |
334 | a9465922 | bellard | return n1;
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335 | a9465922 | bellard | } |
336 | a9465922 | bellard | |
337 | ce1a14dc | pbrook | typedef struct QCowAIOCB { |
338 | ce1a14dc | pbrook | BlockDriverAIOCB common; |
339 | 585f8587 | bellard | int64_t sector_num; |
340 | f141eafe | aliguori | QEMUIOVector *qiov; |
341 | 585f8587 | bellard | uint8_t *buf; |
342 | f141eafe | aliguori | void *orig_buf;
|
343 | 585f8587 | bellard | int nb_sectors;
|
344 | 585f8587 | bellard | int n;
|
345 | 585f8587 | bellard | uint64_t cluster_offset; |
346 | 5fafdf24 | ths | uint8_t *cluster_data; |
347 | 585f8587 | bellard | BlockDriverAIOCB *hd_aiocb; |
348 | c87c0672 | aliguori | struct iovec hd_iov;
|
349 | c87c0672 | aliguori | QEMUIOVector hd_qiov; |
350 | 1490791f | aliguori | QEMUBH *bh; |
351 | e976c6a1 | aliguori | QCowL2Meta l2meta; |
352 | 585f8587 | bellard | } QCowAIOCB; |
353 | 585f8587 | bellard | |
354 | c16b5a2c | Christoph Hellwig | static void qcow_aio_cancel(BlockDriverAIOCB *blockacb) |
355 | c16b5a2c | Christoph Hellwig | { |
356 | c16b5a2c | Christoph Hellwig | QCowAIOCB *acb = (QCowAIOCB *)blockacb; |
357 | c16b5a2c | Christoph Hellwig | if (acb->hd_aiocb)
|
358 | c16b5a2c | Christoph Hellwig | bdrv_aio_cancel(acb->hd_aiocb); |
359 | c16b5a2c | Christoph Hellwig | qemu_aio_release(acb); |
360 | c16b5a2c | Christoph Hellwig | } |
361 | c16b5a2c | Christoph Hellwig | |
362 | c16b5a2c | Christoph Hellwig | static AIOPool qcow_aio_pool = {
|
363 | c16b5a2c | Christoph Hellwig | .aiocb_size = sizeof(QCowAIOCB),
|
364 | c16b5a2c | Christoph Hellwig | .cancel = qcow_aio_cancel, |
365 | c16b5a2c | Christoph Hellwig | }; |
366 | c16b5a2c | Christoph Hellwig | |
367 | 1490791f | aliguori | static void qcow_aio_read_cb(void *opaque, int ret); |
368 | 1490791f | aliguori | static void qcow_aio_read_bh(void *opaque) |
369 | 1490791f | aliguori | { |
370 | 1490791f | aliguori | QCowAIOCB *acb = opaque; |
371 | 1490791f | aliguori | qemu_bh_delete(acb->bh); |
372 | 1490791f | aliguori | acb->bh = NULL;
|
373 | 1490791f | aliguori | qcow_aio_read_cb(opaque, 0);
|
374 | 1490791f | aliguori | } |
375 | 1490791f | aliguori | |
376 | a32ef786 | aliguori | static int qcow_schedule_bh(QEMUBHFunc *cb, QCowAIOCB *acb) |
377 | a32ef786 | aliguori | { |
378 | a32ef786 | aliguori | if (acb->bh)
|
379 | a32ef786 | aliguori | return -EIO;
|
380 | a32ef786 | aliguori | |
381 | a32ef786 | aliguori | acb->bh = qemu_bh_new(cb, acb); |
382 | a32ef786 | aliguori | if (!acb->bh)
|
383 | a32ef786 | aliguori | return -EIO;
|
384 | a32ef786 | aliguori | |
385 | a32ef786 | aliguori | qemu_bh_schedule(acb->bh); |
386 | a32ef786 | aliguori | |
387 | a32ef786 | aliguori | return 0; |
388 | a32ef786 | aliguori | } |
389 | a32ef786 | aliguori | |
390 | 585f8587 | bellard | static void qcow_aio_read_cb(void *opaque, int ret) |
391 | 585f8587 | bellard | { |
392 | ce1a14dc | pbrook | QCowAIOCB *acb = opaque; |
393 | ce1a14dc | pbrook | BlockDriverState *bs = acb->common.bs; |
394 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
395 | a9465922 | bellard | int index_in_cluster, n1;
|
396 | 585f8587 | bellard | |
397 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
398 | f141eafe | aliguori | if (ret < 0) |
399 | f141eafe | aliguori | goto done;
|
400 | 585f8587 | bellard | |
401 | 585f8587 | bellard | /* post process the read buffer */
|
402 | ce1a14dc | pbrook | if (!acb->cluster_offset) {
|
403 | 585f8587 | bellard | /* nothing to do */
|
404 | ce1a14dc | pbrook | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
405 | 585f8587 | bellard | /* nothing to do */
|
406 | 585f8587 | bellard | } else {
|
407 | 585f8587 | bellard | if (s->crypt_method) {
|
408 | 5fafdf24 | ths | encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf, |
409 | 5fafdf24 | ths | acb->n, 0,
|
410 | 585f8587 | bellard | &s->aes_decrypt_key); |
411 | 585f8587 | bellard | } |
412 | 585f8587 | bellard | } |
413 | 585f8587 | bellard | |
414 | ce1a14dc | pbrook | acb->nb_sectors -= acb->n; |
415 | ce1a14dc | pbrook | acb->sector_num += acb->n; |
416 | ce1a14dc | pbrook | acb->buf += acb->n * 512;
|
417 | 585f8587 | bellard | |
418 | ce1a14dc | pbrook | if (acb->nb_sectors == 0) { |
419 | 585f8587 | bellard | /* request completed */
|
420 | f141eafe | aliguori | ret = 0;
|
421 | f141eafe | aliguori | goto done;
|
422 | 585f8587 | bellard | } |
423 | 3b46e624 | ths | |
424 | 585f8587 | bellard | /* prepare next AIO request */
|
425 | 095a9c58 | aliguori | acb->n = acb->nb_sectors; |
426 | 095a9c58 | aliguori | acb->cluster_offset = get_cluster_offset(bs, acb->sector_num << 9, &acb->n);
|
427 | ce1a14dc | pbrook | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
|
428 | ce1a14dc | pbrook | |
429 | ce1a14dc | pbrook | if (!acb->cluster_offset) {
|
430 | 585f8587 | bellard | if (bs->backing_hd) {
|
431 | 585f8587 | bellard | /* read from the base image */
|
432 | 5fafdf24 | ths | n1 = backing_read1(bs->backing_hd, acb->sector_num, |
433 | ce1a14dc | pbrook | acb->buf, acb->n); |
434 | a9465922 | bellard | if (n1 > 0) { |
435 | 3f4cb3d3 | blueswir1 | acb->hd_iov.iov_base = (void *)acb->buf;
|
436 | c87c0672 | aliguori | acb->hd_iov.iov_len = acb->n * 512;
|
437 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
438 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num, |
439 | c87c0672 | aliguori | &acb->hd_qiov, acb->n, |
440 | c87c0672 | aliguori | qcow_aio_read_cb, acb); |
441 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
442 | f141eafe | aliguori | goto done;
|
443 | a9465922 | bellard | } else {
|
444 | a32ef786 | aliguori | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
445 | a32ef786 | aliguori | if (ret < 0) |
446 | f141eafe | aliguori | goto done;
|
447 | a9465922 | bellard | } |
448 | 585f8587 | bellard | } else {
|
449 | 585f8587 | bellard | /* Note: in this case, no need to wait */
|
450 | ce1a14dc | pbrook | memset(acb->buf, 0, 512 * acb->n); |
451 | a32ef786 | aliguori | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
452 | a32ef786 | aliguori | if (ret < 0) |
453 | f141eafe | aliguori | goto done;
|
454 | 585f8587 | bellard | } |
455 | ce1a14dc | pbrook | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
456 | 585f8587 | bellard | /* add AIO support for compressed blocks ? */
|
457 | ce1a14dc | pbrook | if (decompress_cluster(s, acb->cluster_offset) < 0) |
458 | f141eafe | aliguori | goto done;
|
459 | 5fafdf24 | ths | memcpy(acb->buf, |
460 | ce1a14dc | pbrook | s->cluster_cache + index_in_cluster * 512, 512 * acb->n); |
461 | a32ef786 | aliguori | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
462 | a32ef786 | aliguori | if (ret < 0) |
463 | f141eafe | aliguori | goto done;
|
464 | 585f8587 | bellard | } else {
|
465 | ce1a14dc | pbrook | if ((acb->cluster_offset & 511) != 0) { |
466 | 585f8587 | bellard | ret = -EIO; |
467 | f141eafe | aliguori | goto done;
|
468 | 585f8587 | bellard | } |
469 | c87c0672 | aliguori | |
470 | 3f4cb3d3 | blueswir1 | acb->hd_iov.iov_base = (void *)acb->buf;
|
471 | c87c0672 | aliguori | acb->hd_iov.iov_len = acb->n * 512;
|
472 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
473 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_readv(s->hd, |
474 | 5fafdf24 | ths | (acb->cluster_offset >> 9) + index_in_cluster,
|
475 | c87c0672 | aliguori | &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb); |
476 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
477 | f141eafe | aliguori | goto done;
|
478 | f141eafe | aliguori | } |
479 | f141eafe | aliguori | |
480 | f141eafe | aliguori | return;
|
481 | f141eafe | aliguori | done:
|
482 | f141eafe | aliguori | if (acb->qiov->niov > 1) { |
483 | f141eafe | aliguori | qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size); |
484 | f141eafe | aliguori | qemu_vfree(acb->orig_buf); |
485 | 585f8587 | bellard | } |
486 | f141eafe | aliguori | acb->common.cb(acb->common.opaque, ret); |
487 | f141eafe | aliguori | qemu_aio_release(acb); |
488 | 585f8587 | bellard | } |
489 | 585f8587 | bellard | |
490 | ce1a14dc | pbrook | static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs,
|
491 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
492 | f141eafe | aliguori | BlockDriverCompletionFunc *cb, void *opaque, int is_write) |
493 | 585f8587 | bellard | { |
494 | ce1a14dc | pbrook | QCowAIOCB *acb; |
495 | ce1a14dc | pbrook | |
496 | c16b5a2c | Christoph Hellwig | acb = qemu_aio_get(&qcow_aio_pool, bs, cb, opaque); |
497 | ce1a14dc | pbrook | if (!acb)
|
498 | ce1a14dc | pbrook | return NULL; |
499 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
500 | ce1a14dc | pbrook | acb->sector_num = sector_num; |
501 | f141eafe | aliguori | acb->qiov = qiov; |
502 | f141eafe | aliguori | if (qiov->niov > 1) { |
503 | e268ca52 | aliguori | acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size); |
504 | f141eafe | aliguori | if (is_write)
|
505 | f141eafe | aliguori | qemu_iovec_to_buffer(qiov, acb->buf); |
506 | 3f4cb3d3 | blueswir1 | } else {
|
507 | 3f4cb3d3 | blueswir1 | acb->buf = (uint8_t *)qiov->iov->iov_base; |
508 | 3f4cb3d3 | blueswir1 | } |
509 | ce1a14dc | pbrook | acb->nb_sectors = nb_sectors; |
510 | ce1a14dc | pbrook | acb->n = 0;
|
511 | ce1a14dc | pbrook | acb->cluster_offset = 0;
|
512 | e976c6a1 | aliguori | acb->l2meta.nb_clusters = 0;
|
513 | ce1a14dc | pbrook | return acb;
|
514 | ce1a14dc | pbrook | } |
515 | ce1a14dc | pbrook | |
516 | f141eafe | aliguori | static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs,
|
517 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
518 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque)
|
519 | ce1a14dc | pbrook | { |
520 | ce1a14dc | pbrook | QCowAIOCB *acb; |
521 | ce1a14dc | pbrook | |
522 | f141eafe | aliguori | acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
|
523 | ce1a14dc | pbrook | if (!acb)
|
524 | ce1a14dc | pbrook | return NULL; |
525 | 585f8587 | bellard | |
526 | 585f8587 | bellard | qcow_aio_read_cb(acb, 0);
|
527 | ce1a14dc | pbrook | return &acb->common;
|
528 | 585f8587 | bellard | } |
529 | 585f8587 | bellard | |
530 | 585f8587 | bellard | static void qcow_aio_write_cb(void *opaque, int ret) |
531 | 585f8587 | bellard | { |
532 | ce1a14dc | pbrook | QCowAIOCB *acb = opaque; |
533 | ce1a14dc | pbrook | BlockDriverState *bs = acb->common.bs; |
534 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
535 | 585f8587 | bellard | int index_in_cluster;
|
536 | 585f8587 | bellard | const uint8_t *src_buf;
|
537 | 095a9c58 | aliguori | int n_end;
|
538 | ce1a14dc | pbrook | |
539 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
540 | ce1a14dc | pbrook | |
541 | f141eafe | aliguori | if (ret < 0) |
542 | f141eafe | aliguori | goto done;
|
543 | 585f8587 | bellard | |
544 | e976c6a1 | aliguori | if (alloc_cluster_link_l2(bs, acb->cluster_offset, &acb->l2meta) < 0) { |
545 | e976c6a1 | aliguori | free_any_clusters(bs, acb->cluster_offset, acb->l2meta.nb_clusters); |
546 | f141eafe | aliguori | goto done;
|
547 | e976c6a1 | aliguori | } |
548 | e976c6a1 | aliguori | |
549 | ce1a14dc | pbrook | acb->nb_sectors -= acb->n; |
550 | ce1a14dc | pbrook | acb->sector_num += acb->n; |
551 | ce1a14dc | pbrook | acb->buf += acb->n * 512;
|
552 | 585f8587 | bellard | |
553 | ce1a14dc | pbrook | if (acb->nb_sectors == 0) { |
554 | 585f8587 | bellard | /* request completed */
|
555 | f141eafe | aliguori | ret = 0;
|
556 | f141eafe | aliguori | goto done;
|
557 | 585f8587 | bellard | } |
558 | 3b46e624 | ths | |
559 | ce1a14dc | pbrook | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
|
560 | 095a9c58 | aliguori | n_end = index_in_cluster + acb->nb_sectors; |
561 | 095a9c58 | aliguori | if (s->crypt_method &&
|
562 | 095a9c58 | aliguori | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) |
563 | 095a9c58 | aliguori | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; |
564 | 095a9c58 | aliguori | |
565 | e976c6a1 | aliguori | acb->cluster_offset = alloc_cluster_offset(bs, acb->sector_num << 9,
|
566 | 05203524 | aliguori | index_in_cluster, |
567 | e976c6a1 | aliguori | n_end, &acb->n, &acb->l2meta); |
568 | e976c6a1 | aliguori | if (!acb->cluster_offset || (acb->cluster_offset & 511) != 0) { |
569 | 585f8587 | bellard | ret = -EIO; |
570 | f141eafe | aliguori | goto done;
|
571 | 585f8587 | bellard | } |
572 | 585f8587 | bellard | if (s->crypt_method) {
|
573 | ce1a14dc | pbrook | if (!acb->cluster_data) {
|
574 | 095a9c58 | aliguori | acb->cluster_data = qemu_mallocz(QCOW_MAX_CRYPT_CLUSTERS * |
575 | 095a9c58 | aliguori | s->cluster_size); |
576 | 585f8587 | bellard | } |
577 | 5fafdf24 | ths | encrypt_sectors(s, acb->sector_num, acb->cluster_data, acb->buf, |
578 | ce1a14dc | pbrook | acb->n, 1, &s->aes_encrypt_key);
|
579 | ce1a14dc | pbrook | src_buf = acb->cluster_data; |
580 | 585f8587 | bellard | } else {
|
581 | ce1a14dc | pbrook | src_buf = acb->buf; |
582 | 585f8587 | bellard | } |
583 | c87c0672 | aliguori | acb->hd_iov.iov_base = (void *)src_buf;
|
584 | c87c0672 | aliguori | acb->hd_iov.iov_len = acb->n * 512;
|
585 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
586 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_writev(s->hd, |
587 | c87c0672 | aliguori | (acb->cluster_offset >> 9) + index_in_cluster,
|
588 | c87c0672 | aliguori | &acb->hd_qiov, acb->n, |
589 | c87c0672 | aliguori | qcow_aio_write_cb, acb); |
590 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
591 | f141eafe | aliguori | goto done;
|
592 | f141eafe | aliguori | |
593 | f141eafe | aliguori | return;
|
594 | f141eafe | aliguori | |
595 | f141eafe | aliguori | done:
|
596 | f141eafe | aliguori | if (acb->qiov->niov > 1) |
597 | f141eafe | aliguori | qemu_vfree(acb->orig_buf); |
598 | f141eafe | aliguori | acb->common.cb(acb->common.opaque, ret); |
599 | f141eafe | aliguori | qemu_aio_release(acb); |
600 | 585f8587 | bellard | } |
601 | 585f8587 | bellard | |
602 | f141eafe | aliguori | static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs,
|
603 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
604 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque)
|
605 | 585f8587 | bellard | { |
606 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
607 | ce1a14dc | pbrook | QCowAIOCB *acb; |
608 | 3b46e624 | ths | |
609 | 585f8587 | bellard | s->cluster_cache_offset = -1; /* disable compressed cache */ |
610 | 585f8587 | bellard | |
611 | f141eafe | aliguori | acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
|
612 | ce1a14dc | pbrook | if (!acb)
|
613 | ce1a14dc | pbrook | return NULL; |
614 | 3b46e624 | ths | |
615 | 585f8587 | bellard | qcow_aio_write_cb(acb, 0);
|
616 | ce1a14dc | pbrook | return &acb->common;
|
617 | 585f8587 | bellard | } |
618 | 585f8587 | bellard | |
619 | 585f8587 | bellard | static void qcow_close(BlockDriverState *bs) |
620 | 585f8587 | bellard | { |
621 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
622 | 585f8587 | bellard | qemu_free(s->l1_table); |
623 | 585f8587 | bellard | qemu_free(s->l2_cache); |
624 | 585f8587 | bellard | qemu_free(s->cluster_cache); |
625 | 585f8587 | bellard | qemu_free(s->cluster_data); |
626 | 585f8587 | bellard | refcount_close(bs); |
627 | 585f8587 | bellard | bdrv_delete(s->hd); |
628 | 585f8587 | bellard | } |
629 | 585f8587 | bellard | |
630 | 73c632ed | Kevin Wolf | static int get_bits_from_size(size_t size) |
631 | 73c632ed | Kevin Wolf | { |
632 | 73c632ed | Kevin Wolf | int res = 0; |
633 | 73c632ed | Kevin Wolf | |
634 | 73c632ed | Kevin Wolf | if (size == 0) { |
635 | 73c632ed | Kevin Wolf | return -1; |
636 | 73c632ed | Kevin Wolf | } |
637 | 73c632ed | Kevin Wolf | |
638 | 73c632ed | Kevin Wolf | while (size != 1) { |
639 | 73c632ed | Kevin Wolf | /* Not a power of two */
|
640 | 73c632ed | Kevin Wolf | if (size & 1) { |
641 | 73c632ed | Kevin Wolf | return -1; |
642 | 73c632ed | Kevin Wolf | } |
643 | 73c632ed | Kevin Wolf | |
644 | 73c632ed | Kevin Wolf | size >>= 1;
|
645 | 73c632ed | Kevin Wolf | res++; |
646 | 73c632ed | Kevin Wolf | } |
647 | 73c632ed | Kevin Wolf | |
648 | 73c632ed | Kevin Wolf | return res;
|
649 | 73c632ed | Kevin Wolf | } |
650 | 73c632ed | Kevin Wolf | |
651 | f965509c | aliguori | static int qcow_create2(const char *filename, int64_t total_size, |
652 | f965509c | aliguori | const char *backing_file, const char *backing_format, |
653 | 73c632ed | Kevin Wolf | int flags, size_t cluster_size)
|
654 | 585f8587 | bellard | { |
655 | f965509c | aliguori | |
656 | 585f8587 | bellard | int fd, header_size, backing_filename_len, l1_size, i, shift, l2_bits;
|
657 | 2d2431f0 | aliguori | int ref_clusters, backing_format_len = 0; |
658 | 585f8587 | bellard | QCowHeader header; |
659 | 585f8587 | bellard | uint64_t tmp, offset; |
660 | 585f8587 | bellard | QCowCreateState s1, *s = &s1; |
661 | f965509c | aliguori | QCowExtension ext_bf = {0, 0}; |
662 | f965509c | aliguori | |
663 | 3b46e624 | ths | |
664 | 585f8587 | bellard | memset(s, 0, sizeof(*s)); |
665 | 585f8587 | bellard | |
666 | 585f8587 | bellard | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
|
667 | 585f8587 | bellard | if (fd < 0) |
668 | 585f8587 | bellard | return -1; |
669 | 585f8587 | bellard | memset(&header, 0, sizeof(header)); |
670 | 585f8587 | bellard | header.magic = cpu_to_be32(QCOW_MAGIC); |
671 | 585f8587 | bellard | header.version = cpu_to_be32(QCOW_VERSION); |
672 | 585f8587 | bellard | header.size = cpu_to_be64(total_size * 512);
|
673 | 585f8587 | bellard | header_size = sizeof(header);
|
674 | 585f8587 | bellard | backing_filename_len = 0;
|
675 | 585f8587 | bellard | if (backing_file) {
|
676 | f965509c | aliguori | if (backing_format) {
|
677 | f965509c | aliguori | ext_bf.magic = QCOW_EXT_MAGIC_BACKING_FORMAT; |
678 | f965509c | aliguori | backing_format_len = strlen(backing_format); |
679 | f965509c | aliguori | ext_bf.len = (backing_format_len + 7) & ~7; |
680 | f965509c | aliguori | header_size += ((sizeof(ext_bf) + ext_bf.len + 7) & ~7); |
681 | f965509c | aliguori | } |
682 | 585f8587 | bellard | header.backing_file_offset = cpu_to_be64(header_size); |
683 | 585f8587 | bellard | backing_filename_len = strlen(backing_file); |
684 | 585f8587 | bellard | header.backing_file_size = cpu_to_be32(backing_filename_len); |
685 | 585f8587 | bellard | header_size += backing_filename_len; |
686 | 585f8587 | bellard | } |
687 | 73c632ed | Kevin Wolf | |
688 | 73c632ed | Kevin Wolf | /* Cluster size */
|
689 | 73c632ed | Kevin Wolf | s->cluster_bits = get_bits_from_size(cluster_size); |
690 | 73c632ed | Kevin Wolf | if (s->cluster_bits < MIN_CLUSTER_BITS ||
|
691 | 73c632ed | Kevin Wolf | s->cluster_bits > MAX_CLUSTER_BITS) |
692 | 73c632ed | Kevin Wolf | { |
693 | 73c632ed | Kevin Wolf | fprintf(stderr, "Cluster size must be a power of two between "
|
694 | 73c632ed | Kevin Wolf | "%d and %dk\n",
|
695 | 73c632ed | Kevin Wolf | 1 << MIN_CLUSTER_BITS,
|
696 | 73c632ed | Kevin Wolf | 1 << (MAX_CLUSTER_BITS - 10)); |
697 | 73c632ed | Kevin Wolf | return -EINVAL;
|
698 | 73c632ed | Kevin Wolf | } |
699 | 585f8587 | bellard | s->cluster_size = 1 << s->cluster_bits;
|
700 | 73c632ed | Kevin Wolf | |
701 | 585f8587 | bellard | header.cluster_bits = cpu_to_be32(s->cluster_bits); |
702 | 585f8587 | bellard | header_size = (header_size + 7) & ~7; |
703 | ec36ba14 | ths | if (flags & BLOCK_FLAG_ENCRYPT) {
|
704 | 585f8587 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
705 | 585f8587 | bellard | } else {
|
706 | 585f8587 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
707 | 585f8587 | bellard | } |
708 | 585f8587 | bellard | l2_bits = s->cluster_bits - 3;
|
709 | 585f8587 | bellard | shift = s->cluster_bits + l2_bits; |
710 | 585f8587 | bellard | l1_size = (((total_size * 512) + (1LL << shift) - 1) >> shift); |
711 | 585f8587 | bellard | offset = align_offset(header_size, s->cluster_size); |
712 | 585f8587 | bellard | s->l1_table_offset = offset; |
713 | 585f8587 | bellard | header.l1_table_offset = cpu_to_be64(s->l1_table_offset); |
714 | 585f8587 | bellard | header.l1_size = cpu_to_be32(l1_size); |
715 | 15e6690a | bellard | offset += align_offset(l1_size * sizeof(uint64_t), s->cluster_size);
|
716 | 585f8587 | bellard | |
717 | 585f8587 | bellard | s->refcount_table = qemu_mallocz(s->cluster_size); |
718 | 3b46e624 | ths | |
719 | 585f8587 | bellard | s->refcount_table_offset = offset; |
720 | 585f8587 | bellard | header.refcount_table_offset = cpu_to_be64(offset); |
721 | 585f8587 | bellard | header.refcount_table_clusters = cpu_to_be32(1);
|
722 | 585f8587 | bellard | offset += s->cluster_size; |
723 | 585f8587 | bellard | s->refcount_block_offset = offset; |
724 | 2d2431f0 | aliguori | |
725 | 2d2431f0 | aliguori | /* count how many refcount blocks needed */
|
726 | 2d2431f0 | aliguori | tmp = offset >> s->cluster_bits; |
727 | 2d2431f0 | aliguori | ref_clusters = (tmp >> (s->cluster_bits - REFCOUNT_SHIFT)) + 1;
|
728 | 2d2431f0 | aliguori | for (i=0; i < ref_clusters; i++) { |
729 | 2d2431f0 | aliguori | s->refcount_table[i] = cpu_to_be64(offset); |
730 | 2d2431f0 | aliguori | offset += s->cluster_size; |
731 | 2d2431f0 | aliguori | } |
732 | 2d2431f0 | aliguori | |
733 | 2d2431f0 | aliguori | s->refcount_block = qemu_mallocz(ref_clusters * s->cluster_size); |
734 | 585f8587 | bellard | |
735 | 585f8587 | bellard | /* update refcounts */
|
736 | 585f8587 | bellard | create_refcount_update(s, 0, header_size);
|
737 | 15e6690a | bellard | create_refcount_update(s, s->l1_table_offset, l1_size * sizeof(uint64_t));
|
738 | 585f8587 | bellard | create_refcount_update(s, s->refcount_table_offset, s->cluster_size); |
739 | 2d2431f0 | aliguori | create_refcount_update(s, s->refcount_block_offset, ref_clusters * s->cluster_size); |
740 | 3b46e624 | ths | |
741 | 585f8587 | bellard | /* write all the data */
|
742 | 585f8587 | bellard | write(fd, &header, sizeof(header));
|
743 | 585f8587 | bellard | if (backing_file) {
|
744 | f965509c | aliguori | if (backing_format_len) {
|
745 | f965509c | aliguori | char zero[16]; |
746 | f965509c | aliguori | int d = ext_bf.len - backing_format_len;
|
747 | f965509c | aliguori | |
748 | f965509c | aliguori | memset(zero, 0, sizeof(zero)); |
749 | f965509c | aliguori | cpu_to_be32s(&ext_bf.magic); |
750 | f965509c | aliguori | cpu_to_be32s(&ext_bf.len); |
751 | f965509c | aliguori | write(fd, &ext_bf, sizeof(ext_bf));
|
752 | f965509c | aliguori | write(fd, backing_format, backing_format_len); |
753 | f965509c | aliguori | if (d>0) { |
754 | f965509c | aliguori | write(fd, zero, d); |
755 | f965509c | aliguori | } |
756 | f965509c | aliguori | } |
757 | 585f8587 | bellard | write(fd, backing_file, backing_filename_len); |
758 | 585f8587 | bellard | } |
759 | 585f8587 | bellard | lseek(fd, s->l1_table_offset, SEEK_SET); |
760 | 585f8587 | bellard | tmp = 0;
|
761 | 585f8587 | bellard | for(i = 0;i < l1_size; i++) { |
762 | 585f8587 | bellard | write(fd, &tmp, sizeof(tmp));
|
763 | 585f8587 | bellard | } |
764 | 585f8587 | bellard | lseek(fd, s->refcount_table_offset, SEEK_SET); |
765 | 585f8587 | bellard | write(fd, s->refcount_table, s->cluster_size); |
766 | 3b46e624 | ths | |
767 | 585f8587 | bellard | lseek(fd, s->refcount_block_offset, SEEK_SET); |
768 | 2d2431f0 | aliguori | write(fd, s->refcount_block, ref_clusters * s->cluster_size); |
769 | 585f8587 | bellard | |
770 | 585f8587 | bellard | qemu_free(s->refcount_table); |
771 | 585f8587 | bellard | qemu_free(s->refcount_block); |
772 | 585f8587 | bellard | close(fd); |
773 | 585f8587 | bellard | return 0; |
774 | 585f8587 | bellard | } |
775 | 585f8587 | bellard | |
776 | 0e7e1989 | Kevin Wolf | static int qcow_create(const char *filename, QEMUOptionParameter *options) |
777 | 0e7e1989 | Kevin Wolf | { |
778 | 0e7e1989 | Kevin Wolf | const char *backing_file = NULL; |
779 | 0e7e1989 | Kevin Wolf | const char *backing_fmt = NULL; |
780 | 0e7e1989 | Kevin Wolf | uint64_t sectors = 0;
|
781 | 0e7e1989 | Kevin Wolf | int flags = 0; |
782 | 9ccb258e | Kevin Wolf | size_t cluster_size = 65536;
|
783 | 0e7e1989 | Kevin Wolf | |
784 | 0e7e1989 | Kevin Wolf | /* Read out options */
|
785 | 0e7e1989 | Kevin Wolf | while (options && options->name) {
|
786 | 0e7e1989 | Kevin Wolf | if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
787 | 0e7e1989 | Kevin Wolf | sectors = options->value.n / 512;
|
788 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
789 | 0e7e1989 | Kevin Wolf | backing_file = options->value.s; |
790 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { |
791 | 0e7e1989 | Kevin Wolf | backing_fmt = options->value.s; |
792 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { |
793 | 0e7e1989 | Kevin Wolf | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
|
794 | 73c632ed | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { |
795 | 73c632ed | Kevin Wolf | if (options->value.n) {
|
796 | 73c632ed | Kevin Wolf | cluster_size = options->value.n; |
797 | 73c632ed | Kevin Wolf | } |
798 | 0e7e1989 | Kevin Wolf | } |
799 | 0e7e1989 | Kevin Wolf | options++; |
800 | 0e7e1989 | Kevin Wolf | } |
801 | 0e7e1989 | Kevin Wolf | |
802 | 73c632ed | Kevin Wolf | return qcow_create2(filename, sectors, backing_file, backing_fmt, flags,
|
803 | 73c632ed | Kevin Wolf | cluster_size); |
804 | f965509c | aliguori | } |
805 | f965509c | aliguori | |
806 | 585f8587 | bellard | static int qcow_make_empty(BlockDriverState *bs) |
807 | 585f8587 | bellard | { |
808 | 585f8587 | bellard | #if 0
|
809 | 585f8587 | bellard | /* XXX: not correct */
|
810 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque;
|
811 | 585f8587 | bellard | uint32_t l1_length = s->l1_size * sizeof(uint64_t);
|
812 | 585f8587 | bellard | int ret;
|
813 | 585f8587 | bellard | |
814 | 585f8587 | bellard | memset(s->l1_table, 0, l1_length);
|
815 | 585f8587 | bellard | if (bdrv_pwrite(s->hd, s->l1_table_offset, s->l1_table, l1_length) < 0)
|
816 | ac674887 | aliguori | return -1;
|
817 | 585f8587 | bellard | ret = bdrv_truncate(s->hd, s->l1_table_offset + l1_length);
|
818 | 585f8587 | bellard | if (ret < 0)
|
819 | 585f8587 | bellard | return ret;
|
820 | 3b46e624 | ths | |
821 | 585f8587 | bellard | l2_cache_reset(bs);
|
822 | 585f8587 | bellard | #endif
|
823 | 585f8587 | bellard | return 0; |
824 | 585f8587 | bellard | } |
825 | 585f8587 | bellard | |
826 | 585f8587 | bellard | /* XXX: put compressed sectors first, then all the cluster aligned
|
827 | 585f8587 | bellard | tables to avoid losing bytes in alignment */
|
828 | 5fafdf24 | ths | static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, |
829 | 585f8587 | bellard | const uint8_t *buf, int nb_sectors) |
830 | 585f8587 | bellard | { |
831 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
832 | 585f8587 | bellard | z_stream strm; |
833 | 585f8587 | bellard | int ret, out_len;
|
834 | 585f8587 | bellard | uint8_t *out_buf; |
835 | 585f8587 | bellard | uint64_t cluster_offset; |
836 | 585f8587 | bellard | |
837 | 585f8587 | bellard | if (nb_sectors == 0) { |
838 | 585f8587 | bellard | /* align end of file to a sector boundary to ease reading with
|
839 | 585f8587 | bellard | sector based I/Os */
|
840 | 585f8587 | bellard | cluster_offset = bdrv_getlength(s->hd); |
841 | 585f8587 | bellard | cluster_offset = (cluster_offset + 511) & ~511; |
842 | 585f8587 | bellard | bdrv_truncate(s->hd, cluster_offset); |
843 | 585f8587 | bellard | return 0; |
844 | 585f8587 | bellard | } |
845 | 585f8587 | bellard | |
846 | 585f8587 | bellard | if (nb_sectors != s->cluster_sectors)
|
847 | 585f8587 | bellard | return -EINVAL;
|
848 | 585f8587 | bellard | |
849 | 585f8587 | bellard | out_buf = qemu_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
850 | 585f8587 | bellard | |
851 | 585f8587 | bellard | /* best compression, small window, no zlib header */
|
852 | 585f8587 | bellard | memset(&strm, 0, sizeof(strm)); |
853 | 585f8587 | bellard | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
854 | 5fafdf24 | ths | Z_DEFLATED, -12,
|
855 | 585f8587 | bellard | 9, Z_DEFAULT_STRATEGY);
|
856 | 585f8587 | bellard | if (ret != 0) { |
857 | 585f8587 | bellard | qemu_free(out_buf); |
858 | 585f8587 | bellard | return -1; |
859 | 585f8587 | bellard | } |
860 | 585f8587 | bellard | |
861 | 585f8587 | bellard | strm.avail_in = s->cluster_size; |
862 | 585f8587 | bellard | strm.next_in = (uint8_t *)buf; |
863 | 585f8587 | bellard | strm.avail_out = s->cluster_size; |
864 | 585f8587 | bellard | strm.next_out = out_buf; |
865 | 585f8587 | bellard | |
866 | 585f8587 | bellard | ret = deflate(&strm, Z_FINISH); |
867 | 585f8587 | bellard | if (ret != Z_STREAM_END && ret != Z_OK) {
|
868 | 585f8587 | bellard | qemu_free(out_buf); |
869 | 585f8587 | bellard | deflateEnd(&strm); |
870 | 585f8587 | bellard | return -1; |
871 | 585f8587 | bellard | } |
872 | 585f8587 | bellard | out_len = strm.next_out - out_buf; |
873 | 585f8587 | bellard | |
874 | 585f8587 | bellard | deflateEnd(&strm); |
875 | 585f8587 | bellard | |
876 | 585f8587 | bellard | if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
|
877 | 585f8587 | bellard | /* could not compress: write normal cluster */
|
878 | ade40677 | Kevin Wolf | bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
879 | 585f8587 | bellard | } else {
|
880 | 52d893ec | aliguori | cluster_offset = alloc_compressed_cluster_offset(bs, sector_num << 9,
|
881 | 52d893ec | aliguori | out_len); |
882 | 52d893ec | aliguori | if (!cluster_offset)
|
883 | 52d893ec | aliguori | return -1; |
884 | 585f8587 | bellard | cluster_offset &= s->cluster_offset_mask; |
885 | 585f8587 | bellard | if (bdrv_pwrite(s->hd, cluster_offset, out_buf, out_len) != out_len) {
|
886 | 585f8587 | bellard | qemu_free(out_buf); |
887 | 585f8587 | bellard | return -1; |
888 | 585f8587 | bellard | } |
889 | 585f8587 | bellard | } |
890 | 3b46e624 | ths | |
891 | 585f8587 | bellard | qemu_free(out_buf); |
892 | 585f8587 | bellard | return 0; |
893 | 585f8587 | bellard | } |
894 | 585f8587 | bellard | |
895 | 585f8587 | bellard | static void qcow_flush(BlockDriverState *bs) |
896 | 585f8587 | bellard | { |
897 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
898 | 585f8587 | bellard | bdrv_flush(s->hd); |
899 | 585f8587 | bellard | } |
900 | 585f8587 | bellard | |
901 | 585f8587 | bellard | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
902 | 585f8587 | bellard | { |
903 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
904 | 585f8587 | bellard | bdi->cluster_size = s->cluster_size; |
905 | 5fafdf24 | ths | bdi->vm_state_offset = (int64_t)s->l1_vm_state_index << |
906 | 585f8587 | bellard | (s->cluster_bits + s->l2_bits); |
907 | 585f8587 | bellard | return 0; |
908 | 585f8587 | bellard | } |
909 | 585f8587 | bellard | |
910 | 585f8587 | bellard | |
911 | e97fc193 | aliguori | static int qcow_check(BlockDriverState *bs) |
912 | e97fc193 | aliguori | { |
913 | e97fc193 | aliguori | return check_refcounts(bs);
|
914 | 585f8587 | bellard | } |
915 | 585f8587 | bellard | |
916 | 585f8587 | bellard | #if 0
|
917 | 585f8587 | bellard | static void dump_refcounts(BlockDriverState *bs)
|
918 | 585f8587 | bellard | {
|
919 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque;
|
920 | 585f8587 | bellard | int64_t nb_clusters, k, k1, size;
|
921 | 585f8587 | bellard | int refcount;
|
922 | 585f8587 | bellard | |
923 | 585f8587 | bellard | size = bdrv_getlength(s->hd);
|
924 | 6db6c638 | aliguori | nb_clusters = size_to_clusters(s, size);
|
925 | 585f8587 | bellard | for(k = 0; k < nb_clusters;) {
|
926 | 585f8587 | bellard | k1 = k;
|
927 | 585f8587 | bellard | refcount = get_refcount(bs, k);
|
928 | 585f8587 | bellard | k++;
|
929 | 585f8587 | bellard | while (k < nb_clusters && get_refcount(bs, k) == refcount)
|
930 | 585f8587 | bellard | k++;
|
931 | 585f8587 | bellard | printf("%lld: refcount=%d nb=%lld\n", k, refcount, k - k1);
|
932 | 585f8587 | bellard | }
|
933 | 585f8587 | bellard | }
|
934 | 585f8587 | bellard | #endif
|
935 | 585f8587 | bellard | |
936 | 178e08a5 | aliguori | static int qcow_put_buffer(BlockDriverState *bs, const uint8_t *buf, |
937 | 178e08a5 | aliguori | int64_t pos, int size)
|
938 | 178e08a5 | aliguori | { |
939 | 178e08a5 | aliguori | int growable = bs->growable;
|
940 | 178e08a5 | aliguori | |
941 | 178e08a5 | aliguori | bs->growable = 1;
|
942 | 178e08a5 | aliguori | bdrv_pwrite(bs, pos, buf, size); |
943 | 178e08a5 | aliguori | bs->growable = growable; |
944 | 178e08a5 | aliguori | |
945 | 178e08a5 | aliguori | return size;
|
946 | 178e08a5 | aliguori | } |
947 | 178e08a5 | aliguori | |
948 | 178e08a5 | aliguori | static int qcow_get_buffer(BlockDriverState *bs, uint8_t *buf, |
949 | 178e08a5 | aliguori | int64_t pos, int size)
|
950 | 178e08a5 | aliguori | { |
951 | 178e08a5 | aliguori | int growable = bs->growable;
|
952 | 178e08a5 | aliguori | int ret;
|
953 | 178e08a5 | aliguori | |
954 | 178e08a5 | aliguori | bs->growable = 1;
|
955 | 178e08a5 | aliguori | ret = bdrv_pread(bs, pos, buf, size); |
956 | 178e08a5 | aliguori | bs->growable = growable; |
957 | 178e08a5 | aliguori | |
958 | 178e08a5 | aliguori | return ret;
|
959 | 178e08a5 | aliguori | } |
960 | 178e08a5 | aliguori | |
961 | 0e7e1989 | Kevin Wolf | static QEMUOptionParameter qcow_create_options[] = {
|
962 | db08adf5 | Kevin Wolf | { |
963 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_SIZE, |
964 | db08adf5 | Kevin Wolf | .type = OPT_SIZE, |
965 | db08adf5 | Kevin Wolf | .help = "Virtual disk size"
|
966 | db08adf5 | Kevin Wolf | }, |
967 | db08adf5 | Kevin Wolf | { |
968 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_BACKING_FILE, |
969 | db08adf5 | Kevin Wolf | .type = OPT_STRING, |
970 | db08adf5 | Kevin Wolf | .help = "File name of a base image"
|
971 | db08adf5 | Kevin Wolf | }, |
972 | db08adf5 | Kevin Wolf | { |
973 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_BACKING_FMT, |
974 | db08adf5 | Kevin Wolf | .type = OPT_STRING, |
975 | db08adf5 | Kevin Wolf | .help = "Image format of the base image"
|
976 | db08adf5 | Kevin Wolf | }, |
977 | db08adf5 | Kevin Wolf | { |
978 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_ENCRYPT, |
979 | db08adf5 | Kevin Wolf | .type = OPT_FLAG, |
980 | db08adf5 | Kevin Wolf | .help = "Encrypt the image"
|
981 | db08adf5 | Kevin Wolf | }, |
982 | db08adf5 | Kevin Wolf | { |
983 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_CLUSTER_SIZE, |
984 | db08adf5 | Kevin Wolf | .type = OPT_SIZE, |
985 | db08adf5 | Kevin Wolf | .help = "qcow2 cluster size"
|
986 | db08adf5 | Kevin Wolf | }, |
987 | 0e7e1989 | Kevin Wolf | { NULL }
|
988 | 0e7e1989 | Kevin Wolf | }; |
989 | 0e7e1989 | Kevin Wolf | |
990 | 5efa9d5a | Anthony Liguori | static BlockDriver bdrv_qcow2 = {
|
991 | e60f469c | aurel32 | .format_name = "qcow2",
|
992 | e60f469c | aurel32 | .instance_size = sizeof(BDRVQcowState),
|
993 | e60f469c | aurel32 | .bdrv_probe = qcow_probe, |
994 | e60f469c | aurel32 | .bdrv_open = qcow_open, |
995 | e60f469c | aurel32 | .bdrv_close = qcow_close, |
996 | e60f469c | aurel32 | .bdrv_create = qcow_create, |
997 | e60f469c | aurel32 | .bdrv_flush = qcow_flush, |
998 | e60f469c | aurel32 | .bdrv_is_allocated = qcow_is_allocated, |
999 | e60f469c | aurel32 | .bdrv_set_key = qcow_set_key, |
1000 | e60f469c | aurel32 | .bdrv_make_empty = qcow_make_empty, |
1001 | e60f469c | aurel32 | |
1002 | f141eafe | aliguori | .bdrv_aio_readv = qcow_aio_readv, |
1003 | f141eafe | aliguori | .bdrv_aio_writev = qcow_aio_writev, |
1004 | 585f8587 | bellard | .bdrv_write_compressed = qcow_write_compressed, |
1005 | 585f8587 | bellard | |
1006 | 585f8587 | bellard | .bdrv_snapshot_create = qcow_snapshot_create, |
1007 | e60f469c | aurel32 | .bdrv_snapshot_goto = qcow_snapshot_goto, |
1008 | 585f8587 | bellard | .bdrv_snapshot_delete = qcow_snapshot_delete, |
1009 | e60f469c | aurel32 | .bdrv_snapshot_list = qcow_snapshot_list, |
1010 | e60f469c | aurel32 | .bdrv_get_info = qcow_get_info, |
1011 | f965509c | aliguori | |
1012 | 178e08a5 | aliguori | .bdrv_put_buffer = qcow_put_buffer, |
1013 | 178e08a5 | aliguori | .bdrv_get_buffer = qcow_get_buffer, |
1014 | 178e08a5 | aliguori | |
1015 | 0e7e1989 | Kevin Wolf | .create_options = qcow_create_options, |
1016 | e97fc193 | aliguori | .bdrv_check = qcow_check, |
1017 | 585f8587 | bellard | }; |
1018 | 5efa9d5a | Anthony Liguori | |
1019 | 5efa9d5a | Anthony Liguori | static void bdrv_qcow2_init(void) |
1020 | 5efa9d5a | Anthony Liguori | { |
1021 | 5efa9d5a | Anthony Liguori | bdrv_register(&bdrv_qcow2); |
1022 | 5efa9d5a | Anthony Liguori | } |
1023 | 5efa9d5a | Anthony Liguori | |
1024 | 5efa9d5a | Anthony Liguori | block_init(bdrv_qcow2_init); |