root / block / qcow2.c @ cc84d90f
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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 | 737e150e | Paolo Bonzini | #include "block/block_int.h" |
26 | 1de7afc9 | Paolo Bonzini | #include "qemu/module.h" |
27 | 585f8587 | bellard | #include <zlib.h> |
28 | 753d9b82 | Aurelien Jarno | #include "qemu/aes.h" |
29 | f7d0fe02 | Kevin Wolf | #include "block/qcow2.h" |
30 | 1de7afc9 | Paolo Bonzini | #include "qemu/error-report.h" |
31 | 7b1b5d19 | Paolo Bonzini | #include "qapi/qmp/qerror.h" |
32 | acdfb480 | Kevin Wolf | #include "qapi/qmp/qbool.h" |
33 | 3cce16f4 | Kevin Wolf | #include "trace.h" |
34 | 585f8587 | bellard | |
35 | 585f8587 | bellard | /*
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36 | 585f8587 | bellard | Differences with QCOW:
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37 | 585f8587 | bellard | |
38 | 585f8587 | bellard | - Support for multiple incremental snapshots.
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39 | 585f8587 | bellard | - Memory management by reference counts.
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40 | 585f8587 | bellard | - Clusters which have a reference count of one have the bit
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41 | 585f8587 | bellard | QCOW_OFLAG_COPIED to optimize write performance.
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42 | 5fafdf24 | ths | - Size of compressed clusters is stored in sectors to reduce bit usage
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43 | 585f8587 | bellard | in the cluster offsets.
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44 | 585f8587 | bellard | - Support for storing additional data (such as the VM state) in the
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45 | 3b46e624 | ths | snapshots.
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46 | 585f8587 | bellard | - If a backing store is used, the cluster size is not constrained
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47 | 585f8587 | bellard | (could be backported to QCOW).
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48 | 585f8587 | bellard | - L2 tables have always a size of one cluster.
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49 | 585f8587 | bellard | */
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50 | 585f8587 | bellard | |
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 | 21d82ac9 | Jeff Cody | |
57 | 7c80ab3f | Jes Sorensen | #define QCOW2_EXT_MAGIC_END 0 |
58 | 7c80ab3f | Jes Sorensen | #define QCOW2_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA |
59 | cfcc4c62 | Kevin Wolf | #define QCOW2_EXT_MAGIC_FEATURE_TABLE 0x6803f857 |
60 | 9b80ddf3 | aliguori | |
61 | 7c80ab3f | Jes Sorensen | static int qcow2_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 | 6744cbab | Kevin Wolf | be32_to_cpu(cow_header->version) >= 2)
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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 | 7c80ab3f | Jes Sorensen | static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
82 | cfcc4c62 | Kevin Wolf | uint64_t end_offset, void **p_feature_table)
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83 | 9b80ddf3 | aliguori | { |
84 | 75bab85c | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
85 | 9b80ddf3 | aliguori | QCowExtension ext; |
86 | 9b80ddf3 | aliguori | uint64_t offset; |
87 | 75bab85c | Kevin Wolf | int ret;
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88 | 9b80ddf3 | aliguori | |
89 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
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90 | 7c80ab3f | Jes Sorensen | printf("qcow2_read_extensions: start=%ld end=%ld\n", start_offset, end_offset);
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91 | 9b80ddf3 | aliguori | #endif
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92 | 9b80ddf3 | aliguori | offset = start_offset; |
93 | 9b80ddf3 | aliguori | while (offset < end_offset) {
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94 | 9b80ddf3 | aliguori | |
95 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
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96 | 9b80ddf3 | aliguori | /* Sanity check */
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97 | 9b80ddf3 | aliguori | if (offset > s->cluster_size)
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98 | 7c80ab3f | Jes Sorensen | printf("qcow2_read_extension: suspicious offset %lu\n", offset);
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99 | 9b80ddf3 | aliguori | |
100 | 9b2260cb | Dong Xu Wang | printf("attempting to read extended header in offset %lu\n", offset);
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101 | 9b80ddf3 | aliguori | #endif
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102 | 9b80ddf3 | aliguori | |
103 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) { |
104 | 7c80ab3f | Jes Sorensen | fprintf(stderr, "qcow2_read_extension: ERROR: "
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105 | 0bfcd599 | Blue Swirl | "pread fail from offset %" PRIu64 "\n", |
106 | 0bfcd599 | Blue Swirl | offset); |
107 | 9b80ddf3 | aliguori | return 1; |
108 | 9b80ddf3 | aliguori | } |
109 | 9b80ddf3 | aliguori | be32_to_cpus(&ext.magic); |
110 | 9b80ddf3 | aliguori | be32_to_cpus(&ext.len); |
111 | 9b80ddf3 | aliguori | offset += sizeof(ext);
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112 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
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113 | 9b80ddf3 | aliguori | printf("ext.magic = 0x%x\n", ext.magic);
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114 | 9b80ddf3 | aliguori | #endif
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115 | 64ca6aee | Kevin Wolf | if (ext.len > end_offset - offset) {
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116 | 64ca6aee | Kevin Wolf | error_report("Header extension too large");
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117 | 64ca6aee | Kevin Wolf | return -EINVAL;
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118 | 64ca6aee | Kevin Wolf | } |
119 | 64ca6aee | Kevin Wolf | |
120 | 9b80ddf3 | aliguori | switch (ext.magic) {
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121 | 7c80ab3f | Jes Sorensen | case QCOW2_EXT_MAGIC_END:
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122 | 9b80ddf3 | aliguori | return 0; |
123 | f965509c | aliguori | |
124 | 7c80ab3f | Jes Sorensen | case QCOW2_EXT_MAGIC_BACKING_FORMAT:
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125 | f965509c | aliguori | if (ext.len >= sizeof(bs->backing_format)) { |
126 | f965509c | aliguori | fprintf(stderr, "ERROR: ext_backing_format: len=%u too large"
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127 | 4c978075 | aliguori | " (>=%zu)\n",
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128 | f965509c | aliguori | ext.len, sizeof(bs->backing_format));
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129 | f965509c | aliguori | return 2; |
130 | f965509c | aliguori | } |
131 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, offset , bs->backing_format,
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132 | f965509c | aliguori | ext.len) != ext.len) |
133 | f965509c | aliguori | return 3; |
134 | f965509c | aliguori | bs->backing_format[ext.len] = '\0';
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135 | f965509c | aliguori | #ifdef DEBUG_EXT
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136 | f965509c | aliguori | printf("Qcow2: Got format extension %s\n", bs->backing_format);
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137 | f965509c | aliguori | #endif
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138 | f965509c | aliguori | break;
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139 | f965509c | aliguori | |
140 | cfcc4c62 | Kevin Wolf | case QCOW2_EXT_MAGIC_FEATURE_TABLE:
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141 | cfcc4c62 | Kevin Wolf | if (p_feature_table != NULL) { |
142 | cfcc4c62 | Kevin Wolf | void* feature_table = g_malloc0(ext.len + 2 * sizeof(Qcow2Feature)); |
143 | cfcc4c62 | Kevin Wolf | ret = bdrv_pread(bs->file, offset , feature_table, ext.len); |
144 | cfcc4c62 | Kevin Wolf | if (ret < 0) { |
145 | cfcc4c62 | Kevin Wolf | return ret;
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146 | cfcc4c62 | Kevin Wolf | } |
147 | cfcc4c62 | Kevin Wolf | |
148 | cfcc4c62 | Kevin Wolf | *p_feature_table = feature_table; |
149 | cfcc4c62 | Kevin Wolf | } |
150 | cfcc4c62 | Kevin Wolf | break;
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151 | cfcc4c62 | Kevin Wolf | |
152 | 9b80ddf3 | aliguori | default:
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153 | 75bab85c | Kevin Wolf | /* unknown magic - save it in case we need to rewrite the header */
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154 | 75bab85c | Kevin Wolf | { |
155 | 75bab85c | Kevin Wolf | Qcow2UnknownHeaderExtension *uext; |
156 | 75bab85c | Kevin Wolf | |
157 | 75bab85c | Kevin Wolf | uext = g_malloc0(sizeof(*uext) + ext.len);
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158 | 75bab85c | Kevin Wolf | uext->magic = ext.magic; |
159 | 75bab85c | Kevin Wolf | uext->len = ext.len; |
160 | 75bab85c | Kevin Wolf | QLIST_INSERT_HEAD(&s->unknown_header_ext, uext, next); |
161 | 75bab85c | Kevin Wolf | |
162 | 75bab85c | Kevin Wolf | ret = bdrv_pread(bs->file, offset , uext->data, uext->len); |
163 | 75bab85c | Kevin Wolf | if (ret < 0) { |
164 | 75bab85c | Kevin Wolf | return ret;
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165 | 75bab85c | Kevin Wolf | } |
166 | 75bab85c | Kevin Wolf | } |
167 | 9b80ddf3 | aliguori | break;
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168 | 9b80ddf3 | aliguori | } |
169 | fd29b4bb | Kevin Wolf | |
170 | fd29b4bb | Kevin Wolf | offset += ((ext.len + 7) & ~7); |
171 | 9b80ddf3 | aliguori | } |
172 | 9b80ddf3 | aliguori | |
173 | 9b80ddf3 | aliguori | return 0; |
174 | 9b80ddf3 | aliguori | } |
175 | 9b80ddf3 | aliguori | |
176 | 75bab85c | Kevin Wolf | static void cleanup_unknown_header_ext(BlockDriverState *bs) |
177 | 75bab85c | Kevin Wolf | { |
178 | 75bab85c | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
179 | 75bab85c | Kevin Wolf | Qcow2UnknownHeaderExtension *uext, *next; |
180 | 75bab85c | Kevin Wolf | |
181 | 75bab85c | Kevin Wolf | QLIST_FOREACH_SAFE(uext, &s->unknown_header_ext, next, next) { |
182 | 75bab85c | Kevin Wolf | QLIST_REMOVE(uext, next); |
183 | 75bab85c | Kevin Wolf | g_free(uext); |
184 | 75bab85c | Kevin Wolf | } |
185 | 75bab85c | Kevin Wolf | } |
186 | 9b80ddf3 | aliguori | |
187 | b9531b6e | Stefan Weil | static void GCC_FMT_ATTR(2, 3) report_unsupported(BlockDriverState *bs, |
188 | b9531b6e | Stefan Weil | const char *fmt, ...) |
189 | 6744cbab | Kevin Wolf | { |
190 | 6744cbab | Kevin Wolf | char msg[64]; |
191 | 6744cbab | Kevin Wolf | va_list ap; |
192 | 6744cbab | Kevin Wolf | |
193 | 6744cbab | Kevin Wolf | va_start(ap, fmt); |
194 | 6744cbab | Kevin Wolf | vsnprintf(msg, sizeof(msg), fmt, ap);
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195 | 6744cbab | Kevin Wolf | va_end(ap); |
196 | 6744cbab | Kevin Wolf | |
197 | 6744cbab | Kevin Wolf | qerror_report(QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, |
198 | 6744cbab | Kevin Wolf | bs->device_name, "qcow2", msg);
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199 | 6744cbab | Kevin Wolf | } |
200 | 6744cbab | Kevin Wolf | |
201 | cfcc4c62 | Kevin Wolf | static void report_unsupported_feature(BlockDriverState *bs, |
202 | cfcc4c62 | Kevin Wolf | Qcow2Feature *table, uint64_t mask) |
203 | cfcc4c62 | Kevin Wolf | { |
204 | cfcc4c62 | Kevin Wolf | while (table && table->name[0] != '\0') { |
205 | cfcc4c62 | Kevin Wolf | if (table->type == QCOW2_FEAT_TYPE_INCOMPATIBLE) {
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206 | cfcc4c62 | Kevin Wolf | if (mask & (1 << table->bit)) { |
207 | cfcc4c62 | Kevin Wolf | report_unsupported(bs, "%.46s",table->name);
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208 | cfcc4c62 | Kevin Wolf | mask &= ~(1 << table->bit);
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209 | cfcc4c62 | Kevin Wolf | } |
210 | cfcc4c62 | Kevin Wolf | } |
211 | cfcc4c62 | Kevin Wolf | table++; |
212 | cfcc4c62 | Kevin Wolf | } |
213 | cfcc4c62 | Kevin Wolf | |
214 | cfcc4c62 | Kevin Wolf | if (mask) {
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215 | cfcc4c62 | Kevin Wolf | report_unsupported(bs, "Unknown incompatible feature: %" PRIx64, mask);
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216 | cfcc4c62 | Kevin Wolf | } |
217 | cfcc4c62 | Kevin Wolf | } |
218 | cfcc4c62 | Kevin Wolf | |
219 | c61d0004 | Stefan Hajnoczi | /*
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220 | bfe8043e | Stefan Hajnoczi | * Sets the dirty bit and flushes afterwards if necessary.
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221 | bfe8043e | Stefan Hajnoczi | *
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222 | bfe8043e | Stefan Hajnoczi | * The incompatible_features bit is only set if the image file header was
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223 | bfe8043e | Stefan Hajnoczi | * updated successfully. Therefore it is not required to check the return
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224 | bfe8043e | Stefan Hajnoczi | * value of this function.
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225 | bfe8043e | Stefan Hajnoczi | */
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226 | 280d3735 | Kevin Wolf | int qcow2_mark_dirty(BlockDriverState *bs)
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227 | bfe8043e | Stefan Hajnoczi | { |
228 | bfe8043e | Stefan Hajnoczi | BDRVQcowState *s = bs->opaque; |
229 | bfe8043e | Stefan Hajnoczi | uint64_t val; |
230 | bfe8043e | Stefan Hajnoczi | int ret;
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231 | bfe8043e | Stefan Hajnoczi | |
232 | bfe8043e | Stefan Hajnoczi | assert(s->qcow_version >= 3);
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233 | bfe8043e | Stefan Hajnoczi | |
234 | bfe8043e | Stefan Hajnoczi | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) {
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235 | bfe8043e | Stefan Hajnoczi | return 0; /* already dirty */ |
236 | bfe8043e | Stefan Hajnoczi | } |
237 | bfe8043e | Stefan Hajnoczi | |
238 | bfe8043e | Stefan Hajnoczi | val = cpu_to_be64(s->incompatible_features | QCOW2_INCOMPAT_DIRTY); |
239 | bfe8043e | Stefan Hajnoczi | ret = bdrv_pwrite(bs->file, offsetof(QCowHeader, incompatible_features), |
240 | bfe8043e | Stefan Hajnoczi | &val, sizeof(val));
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241 | bfe8043e | Stefan Hajnoczi | if (ret < 0) { |
242 | bfe8043e | Stefan Hajnoczi | return ret;
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243 | bfe8043e | Stefan Hajnoczi | } |
244 | bfe8043e | Stefan Hajnoczi | ret = bdrv_flush(bs->file); |
245 | bfe8043e | Stefan Hajnoczi | if (ret < 0) { |
246 | bfe8043e | Stefan Hajnoczi | return ret;
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247 | bfe8043e | Stefan Hajnoczi | } |
248 | bfe8043e | Stefan Hajnoczi | |
249 | bfe8043e | Stefan Hajnoczi | /* Only treat image as dirty if the header was updated successfully */
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250 | bfe8043e | Stefan Hajnoczi | s->incompatible_features |= QCOW2_INCOMPAT_DIRTY; |
251 | bfe8043e | Stefan Hajnoczi | return 0; |
252 | bfe8043e | Stefan Hajnoczi | } |
253 | bfe8043e | Stefan Hajnoczi | |
254 | bfe8043e | Stefan Hajnoczi | /*
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255 | c61d0004 | Stefan Hajnoczi | * Clears the dirty bit and flushes before if necessary. Only call this
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256 | c61d0004 | Stefan Hajnoczi | * function when there are no pending requests, it does not guard against
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257 | c61d0004 | Stefan Hajnoczi | * concurrent requests dirtying the image.
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258 | c61d0004 | Stefan Hajnoczi | */
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259 | c61d0004 | Stefan Hajnoczi | static int qcow2_mark_clean(BlockDriverState *bs) |
260 | c61d0004 | Stefan Hajnoczi | { |
261 | c61d0004 | Stefan Hajnoczi | BDRVQcowState *s = bs->opaque; |
262 | c61d0004 | Stefan Hajnoczi | |
263 | c61d0004 | Stefan Hajnoczi | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) {
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264 | c61d0004 | Stefan Hajnoczi | int ret = bdrv_flush(bs);
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265 | c61d0004 | Stefan Hajnoczi | if (ret < 0) { |
266 | c61d0004 | Stefan Hajnoczi | return ret;
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267 | c61d0004 | Stefan Hajnoczi | } |
268 | c61d0004 | Stefan Hajnoczi | |
269 | c61d0004 | Stefan Hajnoczi | s->incompatible_features &= ~QCOW2_INCOMPAT_DIRTY; |
270 | c61d0004 | Stefan Hajnoczi | return qcow2_update_header(bs);
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271 | c61d0004 | Stefan Hajnoczi | } |
272 | c61d0004 | Stefan Hajnoczi | return 0; |
273 | c61d0004 | Stefan Hajnoczi | } |
274 | c61d0004 | Stefan Hajnoczi | |
275 | 69c98726 | Max Reitz | /*
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276 | 69c98726 | Max Reitz | * Marks the image as corrupt.
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277 | 69c98726 | Max Reitz | */
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278 | 69c98726 | Max Reitz | int qcow2_mark_corrupt(BlockDriverState *bs)
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279 | 69c98726 | Max Reitz | { |
280 | 69c98726 | Max Reitz | BDRVQcowState *s = bs->opaque; |
281 | 69c98726 | Max Reitz | |
282 | 69c98726 | Max Reitz | s->incompatible_features |= QCOW2_INCOMPAT_CORRUPT; |
283 | 69c98726 | Max Reitz | return qcow2_update_header(bs);
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284 | 69c98726 | Max Reitz | } |
285 | 69c98726 | Max Reitz | |
286 | 69c98726 | Max Reitz | /*
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287 | 69c98726 | Max Reitz | * Marks the image as consistent, i.e., unsets the corrupt bit, and flushes
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288 | 69c98726 | Max Reitz | * before if necessary.
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289 | 69c98726 | Max Reitz | */
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290 | 69c98726 | Max Reitz | int qcow2_mark_consistent(BlockDriverState *bs)
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291 | 69c98726 | Max Reitz | { |
292 | 69c98726 | Max Reitz | BDRVQcowState *s = bs->opaque; |
293 | 69c98726 | Max Reitz | |
294 | 69c98726 | Max Reitz | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) {
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295 | 69c98726 | Max Reitz | int ret = bdrv_flush(bs);
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296 | 69c98726 | Max Reitz | if (ret < 0) { |
297 | 69c98726 | Max Reitz | return ret;
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298 | 69c98726 | Max Reitz | } |
299 | 69c98726 | Max Reitz | |
300 | 69c98726 | Max Reitz | s->incompatible_features &= ~QCOW2_INCOMPAT_CORRUPT; |
301 | 69c98726 | Max Reitz | return qcow2_update_header(bs);
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302 | 69c98726 | Max Reitz | } |
303 | 69c98726 | Max Reitz | return 0; |
304 | 69c98726 | Max Reitz | } |
305 | 69c98726 | Max Reitz | |
306 | acbe5982 | Stefan Hajnoczi | static int qcow2_check(BlockDriverState *bs, BdrvCheckResult *result, |
307 | acbe5982 | Stefan Hajnoczi | BdrvCheckMode fix) |
308 | acbe5982 | Stefan Hajnoczi | { |
309 | acbe5982 | Stefan Hajnoczi | int ret = qcow2_check_refcounts(bs, result, fix);
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310 | acbe5982 | Stefan Hajnoczi | if (ret < 0) { |
311 | acbe5982 | Stefan Hajnoczi | return ret;
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312 | acbe5982 | Stefan Hajnoczi | } |
313 | acbe5982 | Stefan Hajnoczi | |
314 | acbe5982 | Stefan Hajnoczi | if (fix && result->check_errors == 0 && result->corruptions == 0) { |
315 | 24530f3e | Max Reitz | ret = qcow2_mark_clean(bs); |
316 | 24530f3e | Max Reitz | if (ret < 0) { |
317 | 24530f3e | Max Reitz | return ret;
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318 | 24530f3e | Max Reitz | } |
319 | 24530f3e | Max Reitz | return qcow2_mark_consistent(bs);
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320 | acbe5982 | Stefan Hajnoczi | } |
321 | acbe5982 | Stefan Hajnoczi | return ret;
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322 | acbe5982 | Stefan Hajnoczi | } |
323 | acbe5982 | Stefan Hajnoczi | |
324 | 74c4510a | Kevin Wolf | static QemuOptsList qcow2_runtime_opts = {
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325 | 74c4510a | Kevin Wolf | .name = "qcow2",
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326 | 74c4510a | Kevin Wolf | .head = QTAILQ_HEAD_INITIALIZER(qcow2_runtime_opts.head), |
327 | 74c4510a | Kevin Wolf | .desc = { |
328 | 74c4510a | Kevin Wolf | { |
329 | 64aa99d3 | Kevin Wolf | .name = QCOW2_OPT_LAZY_REFCOUNTS, |
330 | 74c4510a | Kevin Wolf | .type = QEMU_OPT_BOOL, |
331 | 74c4510a | Kevin Wolf | .help = "Postpone refcount updates",
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332 | 74c4510a | Kevin Wolf | }, |
333 | 67af674e | Kevin Wolf | { |
334 | 67af674e | Kevin Wolf | .name = QCOW2_OPT_DISCARD_REQUEST, |
335 | 67af674e | Kevin Wolf | .type = QEMU_OPT_BOOL, |
336 | 67af674e | Kevin Wolf | .help = "Pass guest discard requests to the layer below",
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337 | 67af674e | Kevin Wolf | }, |
338 | 67af674e | Kevin Wolf | { |
339 | 67af674e | Kevin Wolf | .name = QCOW2_OPT_DISCARD_SNAPSHOT, |
340 | 67af674e | Kevin Wolf | .type = QEMU_OPT_BOOL, |
341 | 67af674e | Kevin Wolf | .help = "Generate discard requests when snapshot related space "
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342 | 67af674e | Kevin Wolf | "is freed",
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343 | 67af674e | Kevin Wolf | }, |
344 | 67af674e | Kevin Wolf | { |
345 | 67af674e | Kevin Wolf | .name = QCOW2_OPT_DISCARD_OTHER, |
346 | 67af674e | Kevin Wolf | .type = QEMU_OPT_BOOL, |
347 | 67af674e | Kevin Wolf | .help = "Generate discard requests when other clusters are freed",
|
348 | 67af674e | Kevin Wolf | }, |
349 | 74c4510a | Kevin Wolf | { /* end of list */ }
|
350 | 74c4510a | Kevin Wolf | }, |
351 | 74c4510a | Kevin Wolf | }; |
352 | 74c4510a | Kevin Wolf | |
353 | 015a1036 | Max Reitz | static int qcow2_open(BlockDriverState *bs, QDict *options, int flags, |
354 | 015a1036 | Max Reitz | Error **errp) |
355 | 585f8587 | bellard | { |
356 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
357 | 6d85a57e | Jes Sorensen | int len, i, ret = 0; |
358 | 585f8587 | bellard | QCowHeader header; |
359 | 74c4510a | Kevin Wolf | QemuOpts *opts; |
360 | 74c4510a | Kevin Wolf | Error *local_err = NULL;
|
361 | 9b80ddf3 | aliguori | uint64_t ext_end; |
362 | 2cf7cfa1 | Kevin Wolf | uint64_t l1_vm_state_index; |
363 | 585f8587 | bellard | |
364 | 6d85a57e | Jes Sorensen | ret = bdrv_pread(bs->file, 0, &header, sizeof(header)); |
365 | 6d85a57e | Jes Sorensen | if (ret < 0) { |
366 | 585f8587 | bellard | goto fail;
|
367 | 6d85a57e | Jes Sorensen | } |
368 | 585f8587 | bellard | be32_to_cpus(&header.magic); |
369 | 585f8587 | bellard | be32_to_cpus(&header.version); |
370 | 585f8587 | bellard | be64_to_cpus(&header.backing_file_offset); |
371 | 585f8587 | bellard | be32_to_cpus(&header.backing_file_size); |
372 | 585f8587 | bellard | be64_to_cpus(&header.size); |
373 | 585f8587 | bellard | be32_to_cpus(&header.cluster_bits); |
374 | 585f8587 | bellard | be32_to_cpus(&header.crypt_method); |
375 | 585f8587 | bellard | be64_to_cpus(&header.l1_table_offset); |
376 | 585f8587 | bellard | be32_to_cpus(&header.l1_size); |
377 | 585f8587 | bellard | be64_to_cpus(&header.refcount_table_offset); |
378 | 585f8587 | bellard | be32_to_cpus(&header.refcount_table_clusters); |
379 | 585f8587 | bellard | be64_to_cpus(&header.snapshots_offset); |
380 | 585f8587 | bellard | be32_to_cpus(&header.nb_snapshots); |
381 | 3b46e624 | ths | |
382 | e8cdcec1 | Kevin Wolf | if (header.magic != QCOW_MAGIC) {
|
383 | 15bac0d5 | Stefan Weil | ret = -EMEDIUMTYPE; |
384 | 585f8587 | bellard | goto fail;
|
385 | 6d85a57e | Jes Sorensen | } |
386 | 6744cbab | Kevin Wolf | if (header.version < 2 || header.version > 3) { |
387 | 6744cbab | Kevin Wolf | report_unsupported(bs, "QCOW version %d", header.version);
|
388 | 6744cbab | Kevin Wolf | ret = -ENOTSUP; |
389 | 6744cbab | Kevin Wolf | goto fail;
|
390 | 6744cbab | Kevin Wolf | } |
391 | 6744cbab | Kevin Wolf | |
392 | 6744cbab | Kevin Wolf | s->qcow_version = header.version; |
393 | 6744cbab | Kevin Wolf | |
394 | 6744cbab | Kevin Wolf | /* Initialise version 3 header fields */
|
395 | 6744cbab | Kevin Wolf | if (header.version == 2) { |
396 | 6744cbab | Kevin Wolf | header.incompatible_features = 0;
|
397 | 6744cbab | Kevin Wolf | header.compatible_features = 0;
|
398 | 6744cbab | Kevin Wolf | header.autoclear_features = 0;
|
399 | 6744cbab | Kevin Wolf | header.refcount_order = 4;
|
400 | 6744cbab | Kevin Wolf | header.header_length = 72;
|
401 | 6744cbab | Kevin Wolf | } else {
|
402 | 6744cbab | Kevin Wolf | be64_to_cpus(&header.incompatible_features); |
403 | 6744cbab | Kevin Wolf | be64_to_cpus(&header.compatible_features); |
404 | 6744cbab | Kevin Wolf | be64_to_cpus(&header.autoclear_features); |
405 | 6744cbab | Kevin Wolf | be32_to_cpus(&header.refcount_order); |
406 | 6744cbab | Kevin Wolf | be32_to_cpus(&header.header_length); |
407 | 6744cbab | Kevin Wolf | } |
408 | 6744cbab | Kevin Wolf | |
409 | 6744cbab | Kevin Wolf | if (header.header_length > sizeof(header)) { |
410 | 6744cbab | Kevin Wolf | s->unknown_header_fields_size = header.header_length - sizeof(header);
|
411 | 6744cbab | Kevin Wolf | s->unknown_header_fields = g_malloc(s->unknown_header_fields_size); |
412 | 6744cbab | Kevin Wolf | ret = bdrv_pread(bs->file, sizeof(header), s->unknown_header_fields,
|
413 | 6744cbab | Kevin Wolf | s->unknown_header_fields_size); |
414 | 6744cbab | Kevin Wolf | if (ret < 0) { |
415 | 6744cbab | Kevin Wolf | goto fail;
|
416 | 6744cbab | Kevin Wolf | } |
417 | 6744cbab | Kevin Wolf | } |
418 | 6744cbab | Kevin Wolf | |
419 | cfcc4c62 | Kevin Wolf | if (header.backing_file_offset) {
|
420 | cfcc4c62 | Kevin Wolf | ext_end = header.backing_file_offset; |
421 | cfcc4c62 | Kevin Wolf | } else {
|
422 | cfcc4c62 | Kevin Wolf | ext_end = 1 << header.cluster_bits;
|
423 | cfcc4c62 | Kevin Wolf | } |
424 | cfcc4c62 | Kevin Wolf | |
425 | 6744cbab | Kevin Wolf | /* Handle feature bits */
|
426 | 6744cbab | Kevin Wolf | s->incompatible_features = header.incompatible_features; |
427 | 6744cbab | Kevin Wolf | s->compatible_features = header.compatible_features; |
428 | 6744cbab | Kevin Wolf | s->autoclear_features = header.autoclear_features; |
429 | 6744cbab | Kevin Wolf | |
430 | c61d0004 | Stefan Hajnoczi | if (s->incompatible_features & ~QCOW2_INCOMPAT_MASK) {
|
431 | cfcc4c62 | Kevin Wolf | void *feature_table = NULL; |
432 | cfcc4c62 | Kevin Wolf | qcow2_read_extensions(bs, header.header_length, ext_end, |
433 | cfcc4c62 | Kevin Wolf | &feature_table); |
434 | cfcc4c62 | Kevin Wolf | report_unsupported_feature(bs, feature_table, |
435 | c61d0004 | Stefan Hajnoczi | s->incompatible_features & |
436 | c61d0004 | Stefan Hajnoczi | ~QCOW2_INCOMPAT_MASK); |
437 | 6744cbab | Kevin Wolf | ret = -ENOTSUP; |
438 | 6744cbab | Kevin Wolf | goto fail;
|
439 | 6744cbab | Kevin Wolf | } |
440 | 6744cbab | Kevin Wolf | |
441 | 69c98726 | Max Reitz | if (s->incompatible_features & QCOW2_INCOMPAT_CORRUPT) {
|
442 | 69c98726 | Max Reitz | /* Corrupt images may not be written to unless they are being repaired
|
443 | 69c98726 | Max Reitz | */
|
444 | 69c98726 | Max Reitz | if ((flags & BDRV_O_RDWR) && !(flags & BDRV_O_CHECK)) {
|
445 | 69c98726 | Max Reitz | error_report("qcow2: Image is corrupt; cannot be opened "
|
446 | 69c98726 | Max Reitz | "read/write.");
|
447 | 69c98726 | Max Reitz | ret = -EACCES; |
448 | 69c98726 | Max Reitz | goto fail;
|
449 | 69c98726 | Max Reitz | } |
450 | 69c98726 | Max Reitz | } |
451 | 69c98726 | Max Reitz | |
452 | 6744cbab | Kevin Wolf | /* Check support for various header values */
|
453 | 6744cbab | Kevin Wolf | if (header.refcount_order != 4) { |
454 | 6744cbab | Kevin Wolf | report_unsupported(bs, "%d bit reference counts",
|
455 | 6744cbab | Kevin Wolf | 1 << header.refcount_order);
|
456 | e8cdcec1 | Kevin Wolf | ret = -ENOTSUP; |
457 | e8cdcec1 | Kevin Wolf | goto fail;
|
458 | e8cdcec1 | Kevin Wolf | } |
459 | b6481f37 | Max Reitz | s->refcount_order = header.refcount_order; |
460 | 6744cbab | Kevin Wolf | |
461 | d191d12d | Stefan Weil | if (header.cluster_bits < MIN_CLUSTER_BITS ||
|
462 | 6d85a57e | Jes Sorensen | header.cluster_bits > MAX_CLUSTER_BITS) { |
463 | 6d85a57e | Jes Sorensen | ret = -EINVAL; |
464 | 585f8587 | bellard | goto fail;
|
465 | 6d85a57e | Jes Sorensen | } |
466 | 6d85a57e | Jes Sorensen | if (header.crypt_method > QCOW_CRYPT_AES) {
|
467 | 6d85a57e | Jes Sorensen | ret = -EINVAL; |
468 | 585f8587 | bellard | goto fail;
|
469 | 6d85a57e | Jes Sorensen | } |
470 | 585f8587 | bellard | s->crypt_method_header = header.crypt_method; |
471 | 6d85a57e | Jes Sorensen | if (s->crypt_method_header) {
|
472 | 585f8587 | bellard | bs->encrypted = 1;
|
473 | 6d85a57e | Jes Sorensen | } |
474 | 585f8587 | bellard | s->cluster_bits = header.cluster_bits; |
475 | 585f8587 | bellard | s->cluster_size = 1 << s->cluster_bits;
|
476 | 585f8587 | bellard | s->cluster_sectors = 1 << (s->cluster_bits - 9); |
477 | 585f8587 | bellard | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ |
478 | 585f8587 | bellard | s->l2_size = 1 << s->l2_bits;
|
479 | 585f8587 | bellard | bs->total_sectors = header.size / 512;
|
480 | 585f8587 | bellard | s->csize_shift = (62 - (s->cluster_bits - 8)); |
481 | 585f8587 | bellard | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; |
482 | 585f8587 | bellard | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; |
483 | 585f8587 | bellard | s->refcount_table_offset = header.refcount_table_offset; |
484 | 5fafdf24 | ths | s->refcount_table_size = |
485 | 585f8587 | bellard | header.refcount_table_clusters << (s->cluster_bits - 3);
|
486 | 585f8587 | bellard | |
487 | 585f8587 | bellard | s->snapshots_offset = header.snapshots_offset; |
488 | 585f8587 | bellard | s->nb_snapshots = header.nb_snapshots; |
489 | 585f8587 | bellard | |
490 | 585f8587 | bellard | /* read the level 1 table */
|
491 | 585f8587 | bellard | s->l1_size = header.l1_size; |
492 | 2cf7cfa1 | Kevin Wolf | |
493 | 2cf7cfa1 | Kevin Wolf | l1_vm_state_index = size_to_l1(s, header.size); |
494 | 2cf7cfa1 | Kevin Wolf | if (l1_vm_state_index > INT_MAX) {
|
495 | 2cf7cfa1 | Kevin Wolf | ret = -EFBIG; |
496 | 2cf7cfa1 | Kevin Wolf | goto fail;
|
497 | 2cf7cfa1 | Kevin Wolf | } |
498 | 2cf7cfa1 | Kevin Wolf | s->l1_vm_state_index = l1_vm_state_index; |
499 | 2cf7cfa1 | Kevin Wolf | |
500 | 585f8587 | bellard | /* the L1 table must contain at least enough entries to put
|
501 | 585f8587 | bellard | header.size bytes */
|
502 | 6d85a57e | Jes Sorensen | if (s->l1_size < s->l1_vm_state_index) {
|
503 | 6d85a57e | Jes Sorensen | ret = -EINVAL; |
504 | 585f8587 | bellard | goto fail;
|
505 | 6d85a57e | Jes Sorensen | } |
506 | 585f8587 | bellard | s->l1_table_offset = header.l1_table_offset; |
507 | d191d12d | Stefan Weil | if (s->l1_size > 0) { |
508 | 7267c094 | Anthony Liguori | s->l1_table = g_malloc0( |
509 | d191d12d | Stefan Weil | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
510 | 6d85a57e | Jes Sorensen | ret = bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, |
511 | 6d85a57e | Jes Sorensen | s->l1_size * sizeof(uint64_t));
|
512 | 6d85a57e | Jes Sorensen | if (ret < 0) { |
513 | d191d12d | Stefan Weil | goto fail;
|
514 | 6d85a57e | Jes Sorensen | } |
515 | d191d12d | Stefan Weil | for(i = 0;i < s->l1_size; i++) { |
516 | d191d12d | Stefan Weil | be64_to_cpus(&s->l1_table[i]); |
517 | d191d12d | Stefan Weil | } |
518 | 585f8587 | bellard | } |
519 | 29c1a730 | Kevin Wolf | |
520 | 29c1a730 | Kevin Wolf | /* alloc L2 table/refcount block cache */
|
521 | 6af4e9ea | Paolo Bonzini | s->l2_table_cache = qcow2_cache_create(bs, L2_CACHE_SIZE); |
522 | 6af4e9ea | Paolo Bonzini | s->refcount_block_cache = qcow2_cache_create(bs, REFCOUNT_CACHE_SIZE); |
523 | 29c1a730 | Kevin Wolf | |
524 | 7267c094 | Anthony Liguori | s->cluster_cache = g_malloc(s->cluster_size); |
525 | 585f8587 | bellard | /* one more sector for decompressed data alignment */
|
526 | dea43a65 | Frediano Ziglio | s->cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
527 | 095a9c58 | aliguori | + 512);
|
528 | 585f8587 | bellard | s->cluster_cache_offset = -1;
|
529 | 06d9260f | Anthony Liguori | s->flags = flags; |
530 | 3b46e624 | ths | |
531 | 6d85a57e | Jes Sorensen | ret = qcow2_refcount_init(bs); |
532 | 6d85a57e | Jes Sorensen | if (ret != 0) { |
533 | 585f8587 | bellard | goto fail;
|
534 | 6d85a57e | Jes Sorensen | } |
535 | 585f8587 | bellard | |
536 | 72cf2d4f | Blue Swirl | QLIST_INIT(&s->cluster_allocs); |
537 | 0b919fae | Kevin Wolf | QTAILQ_INIT(&s->discards); |
538 | f214978a | Kevin Wolf | |
539 | 9b80ddf3 | aliguori | /* read qcow2 extensions */
|
540 | cfcc4c62 | Kevin Wolf | if (qcow2_read_extensions(bs, header.header_length, ext_end, NULL)) { |
541 | 6d85a57e | Jes Sorensen | ret = -EINVAL; |
542 | 9b80ddf3 | aliguori | goto fail;
|
543 | 6d85a57e | Jes Sorensen | } |
544 | 9b80ddf3 | aliguori | |
545 | 585f8587 | bellard | /* read the backing file name */
|
546 | 585f8587 | bellard | if (header.backing_file_offset != 0) { |
547 | 585f8587 | bellard | len = header.backing_file_size; |
548 | 6d85a57e | Jes Sorensen | if (len > 1023) { |
549 | 585f8587 | bellard | len = 1023;
|
550 | 6d85a57e | Jes Sorensen | } |
551 | 6d85a57e | Jes Sorensen | ret = bdrv_pread(bs->file, header.backing_file_offset, |
552 | 6d85a57e | Jes Sorensen | bs->backing_file, len); |
553 | 6d85a57e | Jes Sorensen | if (ret < 0) { |
554 | 585f8587 | bellard | goto fail;
|
555 | 6d85a57e | Jes Sorensen | } |
556 | 585f8587 | bellard | bs->backing_file[len] = '\0';
|
557 | 585f8587 | bellard | } |
558 | 42deb29f | Kevin Wolf | |
559 | 42deb29f | Kevin Wolf | ret = qcow2_read_snapshots(bs); |
560 | 42deb29f | Kevin Wolf | if (ret < 0) { |
561 | 585f8587 | bellard | goto fail;
|
562 | 6d85a57e | Jes Sorensen | } |
563 | 585f8587 | bellard | |
564 | af7b708d | Stefan Hajnoczi | /* Clear unknown autoclear feature bits */
|
565 | af7b708d | Stefan Hajnoczi | if (!bs->read_only && s->autoclear_features != 0) { |
566 | af7b708d | Stefan Hajnoczi | s->autoclear_features = 0;
|
567 | af7b708d | Stefan Hajnoczi | ret = qcow2_update_header(bs); |
568 | af7b708d | Stefan Hajnoczi | if (ret < 0) { |
569 | af7b708d | Stefan Hajnoczi | goto fail;
|
570 | af7b708d | Stefan Hajnoczi | } |
571 | af7b708d | Stefan Hajnoczi | } |
572 | af7b708d | Stefan Hajnoczi | |
573 | 68d100e9 | Kevin Wolf | /* Initialise locks */
|
574 | 68d100e9 | Kevin Wolf | qemu_co_mutex_init(&s->lock); |
575 | 68d100e9 | Kevin Wolf | |
576 | c61d0004 | Stefan Hajnoczi | /* Repair image if dirty */
|
577 | 058f8f16 | Stefan Hajnoczi | if (!(flags & BDRV_O_CHECK) && !bs->read_only &&
|
578 | 058f8f16 | Stefan Hajnoczi | (s->incompatible_features & QCOW2_INCOMPAT_DIRTY)) { |
579 | c61d0004 | Stefan Hajnoczi | BdrvCheckResult result = {0};
|
580 | c61d0004 | Stefan Hajnoczi | |
581 | acbe5982 | Stefan Hajnoczi | ret = qcow2_check(bs, &result, BDRV_FIX_ERRORS); |
582 | c61d0004 | Stefan Hajnoczi | if (ret < 0) { |
583 | c61d0004 | Stefan Hajnoczi | goto fail;
|
584 | c61d0004 | Stefan Hajnoczi | } |
585 | c61d0004 | Stefan Hajnoczi | } |
586 | c61d0004 | Stefan Hajnoczi | |
587 | 74c4510a | Kevin Wolf | /* Enable lazy_refcounts according to image and command line options */
|
588 | 74c4510a | Kevin Wolf | opts = qemu_opts_create_nofail(&qcow2_runtime_opts); |
589 | 74c4510a | Kevin Wolf | qemu_opts_absorb_qdict(opts, options, &local_err); |
590 | 74c4510a | Kevin Wolf | if (error_is_set(&local_err)) {
|
591 | 74c4510a | Kevin Wolf | qerror_report_err(local_err); |
592 | 74c4510a | Kevin Wolf | error_free(local_err); |
593 | 74c4510a | Kevin Wolf | ret = -EINVAL; |
594 | 74c4510a | Kevin Wolf | goto fail;
|
595 | 74c4510a | Kevin Wolf | } |
596 | 74c4510a | Kevin Wolf | |
597 | acdfb480 | Kevin Wolf | s->use_lazy_refcounts = qemu_opt_get_bool(opts, QCOW2_OPT_LAZY_REFCOUNTS, |
598 | 74c4510a | Kevin Wolf | (s->compatible_features & QCOW2_COMPAT_LAZY_REFCOUNTS)); |
599 | 74c4510a | Kevin Wolf | |
600 | 67af674e | Kevin Wolf | s->discard_passthrough[QCOW2_DISCARD_NEVER] = false;
|
601 | 67af674e | Kevin Wolf | s->discard_passthrough[QCOW2_DISCARD_ALWAYS] = true;
|
602 | 67af674e | Kevin Wolf | s->discard_passthrough[QCOW2_DISCARD_REQUEST] = |
603 | 67af674e | Kevin Wolf | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_REQUEST, |
604 | 67af674e | Kevin Wolf | flags & BDRV_O_UNMAP); |
605 | 67af674e | Kevin Wolf | s->discard_passthrough[QCOW2_DISCARD_SNAPSHOT] = |
606 | 67af674e | Kevin Wolf | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_SNAPSHOT, true);
|
607 | 67af674e | Kevin Wolf | s->discard_passthrough[QCOW2_DISCARD_OTHER] = |
608 | 67af674e | Kevin Wolf | qemu_opt_get_bool(opts, QCOW2_OPT_DISCARD_OTHER, false);
|
609 | 67af674e | Kevin Wolf | |
610 | 74c4510a | Kevin Wolf | qemu_opts_del(opts); |
611 | 74c4510a | Kevin Wolf | |
612 | 74c4510a | Kevin Wolf | if (s->use_lazy_refcounts && s->qcow_version < 3) { |
613 | 74c4510a | Kevin Wolf | qerror_report(ERROR_CLASS_GENERIC_ERROR, "Lazy refcounts require "
|
614 | 74c4510a | Kevin Wolf | "a qcow2 image with at least qemu 1.1 compatibility level");
|
615 | 74c4510a | Kevin Wolf | ret = -EINVAL; |
616 | 74c4510a | Kevin Wolf | goto fail;
|
617 | 74c4510a | Kevin Wolf | } |
618 | 74c4510a | Kevin Wolf | |
619 | 585f8587 | bellard | #ifdef DEBUG_ALLOC
|
620 | 6cbc3031 | Philipp Hahn | { |
621 | 6cbc3031 | Philipp Hahn | BdrvCheckResult result = {0};
|
622 | b35278f7 | Stefan Hajnoczi | qcow2_check_refcounts(bs, &result, 0);
|
623 | 6cbc3031 | Philipp Hahn | } |
624 | 585f8587 | bellard | #endif
|
625 | 6d85a57e | Jes Sorensen | return ret;
|
626 | 585f8587 | bellard | |
627 | 585f8587 | bellard | fail:
|
628 | 6744cbab | Kevin Wolf | g_free(s->unknown_header_fields); |
629 | 75bab85c | Kevin Wolf | cleanup_unknown_header_ext(bs); |
630 | ed6ccf0f | Kevin Wolf | qcow2_free_snapshots(bs); |
631 | ed6ccf0f | Kevin Wolf | qcow2_refcount_close(bs); |
632 | 7267c094 | Anthony Liguori | g_free(s->l1_table); |
633 | cf93980e | Max Reitz | /* else pre-write overlap checks in cache_destroy may crash */
|
634 | cf93980e | Max Reitz | s->l1_table = NULL;
|
635 | 29c1a730 | Kevin Wolf | if (s->l2_table_cache) {
|
636 | 29c1a730 | Kevin Wolf | qcow2_cache_destroy(bs, s->l2_table_cache); |
637 | 29c1a730 | Kevin Wolf | } |
638 | 7267c094 | Anthony Liguori | g_free(s->cluster_cache); |
639 | dea43a65 | Frediano Ziglio | qemu_vfree(s->cluster_data); |
640 | 6d85a57e | Jes Sorensen | return ret;
|
641 | 585f8587 | bellard | } |
642 | 585f8587 | bellard | |
643 | 7c80ab3f | Jes Sorensen | static int qcow2_set_key(BlockDriverState *bs, const char *key) |
644 | 585f8587 | bellard | { |
645 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
646 | 585f8587 | bellard | uint8_t keybuf[16];
|
647 | 585f8587 | bellard | int len, i;
|
648 | 3b46e624 | ths | |
649 | 585f8587 | bellard | memset(keybuf, 0, 16); |
650 | 585f8587 | bellard | len = strlen(key); |
651 | 585f8587 | bellard | if (len > 16) |
652 | 585f8587 | bellard | len = 16;
|
653 | 585f8587 | bellard | /* XXX: we could compress the chars to 7 bits to increase
|
654 | 585f8587 | bellard | entropy */
|
655 | 585f8587 | bellard | for(i = 0;i < len;i++) { |
656 | 585f8587 | bellard | keybuf[i] = key[i]; |
657 | 585f8587 | bellard | } |
658 | 585f8587 | bellard | s->crypt_method = s->crypt_method_header; |
659 | 585f8587 | bellard | |
660 | 585f8587 | bellard | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) |
661 | 585f8587 | bellard | return -1; |
662 | 585f8587 | bellard | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) |
663 | 585f8587 | bellard | return -1; |
664 | 585f8587 | bellard | #if 0
|
665 | 585f8587 | bellard | /* test */
|
666 | 585f8587 | bellard | {
|
667 | 585f8587 | bellard | uint8_t in[16];
|
668 | 585f8587 | bellard | uint8_t out[16];
|
669 | 585f8587 | bellard | uint8_t tmp[16];
|
670 | 585f8587 | bellard | for(i=0;i<16;i++)
|
671 | 585f8587 | bellard | in[i] = i;
|
672 | 585f8587 | bellard | AES_encrypt(in, tmp, &s->aes_encrypt_key);
|
673 | 585f8587 | bellard | AES_decrypt(tmp, out, &s->aes_decrypt_key);
|
674 | 585f8587 | bellard | for(i = 0; i < 16; i++)
|
675 | 585f8587 | bellard | printf(" %02x", tmp[i]);
|
676 | 585f8587 | bellard | printf("\n");
|
677 | 585f8587 | bellard | for(i = 0; i < 16; i++)
|
678 | 585f8587 | bellard | printf(" %02x", out[i]);
|
679 | 585f8587 | bellard | printf("\n");
|
680 | 585f8587 | bellard | }
|
681 | 585f8587 | bellard | #endif
|
682 | 585f8587 | bellard | return 0; |
683 | 585f8587 | bellard | } |
684 | 585f8587 | bellard | |
685 | 21d82ac9 | Jeff Cody | /* We have nothing to do for QCOW2 reopen, stubs just return
|
686 | 21d82ac9 | Jeff Cody | * success */
|
687 | 21d82ac9 | Jeff Cody | static int qcow2_reopen_prepare(BDRVReopenState *state, |
688 | 21d82ac9 | Jeff Cody | BlockReopenQueue *queue, Error **errp) |
689 | 21d82ac9 | Jeff Cody | { |
690 | 21d82ac9 | Jeff Cody | return 0; |
691 | 21d82ac9 | Jeff Cody | } |
692 | 21d82ac9 | Jeff Cody | |
693 | b6b8a333 | Paolo Bonzini | static int64_t coroutine_fn qcow2_co_get_block_status(BlockDriverState *bs,
|
694 | f8a2e5e3 | Stefan Hajnoczi | int64_t sector_num, int nb_sectors, int *pnum) |
695 | 585f8587 | bellard | { |
696 | f8a2e5e3 | Stefan Hajnoczi | BDRVQcowState *s = bs->opaque; |
697 | 585f8587 | bellard | uint64_t cluster_offset; |
698 | 4bc74be9 | Paolo Bonzini | int index_in_cluster, ret;
|
699 | 4bc74be9 | Paolo Bonzini | int64_t status = 0;
|
700 | 585f8587 | bellard | |
701 | 095a9c58 | aliguori | *pnum = nb_sectors; |
702 | f8a2e5e3 | Stefan Hajnoczi | qemu_co_mutex_lock(&s->lock); |
703 | 1c46efaa | Kevin Wolf | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset);
|
704 | f8a2e5e3 | Stefan Hajnoczi | qemu_co_mutex_unlock(&s->lock); |
705 | 1c46efaa | Kevin Wolf | if (ret < 0) { |
706 | d663640c | Paolo Bonzini | return ret;
|
707 | 1c46efaa | Kevin Wolf | } |
708 | 095a9c58 | aliguori | |
709 | 4bc74be9 | Paolo Bonzini | if (cluster_offset != 0 && ret != QCOW2_CLUSTER_COMPRESSED && |
710 | 4bc74be9 | Paolo Bonzini | !s->crypt_method) { |
711 | 4bc74be9 | Paolo Bonzini | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
712 | 4bc74be9 | Paolo Bonzini | cluster_offset |= (index_in_cluster << BDRV_SECTOR_BITS); |
713 | 4bc74be9 | Paolo Bonzini | status |= BDRV_BLOCK_OFFSET_VALID | cluster_offset; |
714 | 4bc74be9 | Paolo Bonzini | } |
715 | 4bc74be9 | Paolo Bonzini | if (ret == QCOW2_CLUSTER_ZERO) {
|
716 | 4bc74be9 | Paolo Bonzini | status |= BDRV_BLOCK_ZERO; |
717 | 4bc74be9 | Paolo Bonzini | } else if (ret != QCOW2_CLUSTER_UNALLOCATED) { |
718 | 4bc74be9 | Paolo Bonzini | status |= BDRV_BLOCK_DATA; |
719 | 4bc74be9 | Paolo Bonzini | } |
720 | 4bc74be9 | Paolo Bonzini | return status;
|
721 | 585f8587 | bellard | } |
722 | 585f8587 | bellard | |
723 | a9465922 | bellard | /* handle reading after the end of the backing file */
|
724 | bd28f835 | Kevin Wolf | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
|
725 | bd28f835 | Kevin Wolf | int64_t sector_num, int nb_sectors)
|
726 | a9465922 | bellard | { |
727 | a9465922 | bellard | int n1;
|
728 | a9465922 | bellard | if ((sector_num + nb_sectors) <= bs->total_sectors)
|
729 | a9465922 | bellard | return nb_sectors;
|
730 | a9465922 | bellard | if (sector_num >= bs->total_sectors)
|
731 | a9465922 | bellard | n1 = 0;
|
732 | a9465922 | bellard | else
|
733 | a9465922 | bellard | n1 = bs->total_sectors - sector_num; |
734 | bd28f835 | Kevin Wolf | |
735 | 3d9b4925 | Michael Tokarev | qemu_iovec_memset(qiov, 512 * n1, 0, 512 * (nb_sectors - n1)); |
736 | bd28f835 | Kevin Wolf | |
737 | a9465922 | bellard | return n1;
|
738 | a9465922 | bellard | } |
739 | a9465922 | bellard | |
740 | a968168c | Dong Xu Wang | static coroutine_fn int qcow2_co_readv(BlockDriverState *bs, int64_t sector_num, |
741 | 3fc48d09 | Frediano Ziglio | int remaining_sectors, QEMUIOVector *qiov)
|
742 | 585f8587 | bellard | { |
743 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
744 | a9465922 | bellard | int index_in_cluster, n1;
|
745 | 68d100e9 | Kevin Wolf | int ret;
|
746 | faf575c1 | Frediano Ziglio | int cur_nr_sectors; /* number of sectors in current iteration */ |
747 | c2bdd990 | Frediano Ziglio | uint64_t cluster_offset = 0;
|
748 | 3fc48d09 | Frediano Ziglio | uint64_t bytes_done = 0;
|
749 | 3fc48d09 | Frediano Ziglio | QEMUIOVector hd_qiov; |
750 | 3fc48d09 | Frediano Ziglio | uint8_t *cluster_data = NULL;
|
751 | 585f8587 | bellard | |
752 | 3fc48d09 | Frediano Ziglio | qemu_iovec_init(&hd_qiov, qiov->niov); |
753 | 3fc48d09 | Frediano Ziglio | |
754 | 3fc48d09 | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
755 | 3fc48d09 | Frediano Ziglio | |
756 | 3fc48d09 | Frediano Ziglio | while (remaining_sectors != 0) { |
757 | bd28f835 | Kevin Wolf | |
758 | 5ebaa27e | Frediano Ziglio | /* prepare next request */
|
759 | 3fc48d09 | Frediano Ziglio | cur_nr_sectors = remaining_sectors; |
760 | 5ebaa27e | Frediano Ziglio | if (s->crypt_method) {
|
761 | 5ebaa27e | Frediano Ziglio | cur_nr_sectors = MIN(cur_nr_sectors, |
762 | 5ebaa27e | Frediano Ziglio | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); |
763 | 585f8587 | bellard | } |
764 | 5ebaa27e | Frediano Ziglio | |
765 | 3fc48d09 | Frediano Ziglio | ret = qcow2_get_cluster_offset(bs, sector_num << 9,
|
766 | 5ebaa27e | Frediano Ziglio | &cur_nr_sectors, &cluster_offset); |
767 | 8af36488 | Kevin Wolf | if (ret < 0) { |
768 | 3fc48d09 | Frediano Ziglio | goto fail;
|
769 | 8af36488 | Kevin Wolf | } |
770 | bd28f835 | Kevin Wolf | |
771 | 3fc48d09 | Frediano Ziglio | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
772 | c87c0672 | aliguori | |
773 | 3fc48d09 | Frediano Ziglio | qemu_iovec_reset(&hd_qiov); |
774 | 1b093c48 | Michael Tokarev | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
775 | 5ebaa27e | Frediano Ziglio | cur_nr_sectors * 512);
|
776 | 5ebaa27e | Frediano Ziglio | |
777 | 68d000a3 | Kevin Wolf | switch (ret) {
|
778 | 68d000a3 | Kevin Wolf | case QCOW2_CLUSTER_UNALLOCATED:
|
779 | 5ebaa27e | Frediano Ziglio | |
780 | 5ebaa27e | Frediano Ziglio | if (bs->backing_hd) {
|
781 | 5ebaa27e | Frediano Ziglio | /* read from the base image */
|
782 | 3fc48d09 | Frediano Ziglio | n1 = qcow2_backing_read1(bs->backing_hd, &hd_qiov, |
783 | 3fc48d09 | Frediano Ziglio | sector_num, cur_nr_sectors); |
784 | 5ebaa27e | Frediano Ziglio | if (n1 > 0) { |
785 | 5ebaa27e | Frediano Ziglio | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
786 | 5ebaa27e | Frediano Ziglio | qemu_co_mutex_unlock(&s->lock); |
787 | 3fc48d09 | Frediano Ziglio | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
788 | 3fc48d09 | Frediano Ziglio | n1, &hd_qiov); |
789 | 5ebaa27e | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
790 | 5ebaa27e | Frediano Ziglio | if (ret < 0) { |
791 | 3fc48d09 | Frediano Ziglio | goto fail;
|
792 | 5ebaa27e | Frediano Ziglio | } |
793 | 5ebaa27e | Frediano Ziglio | } |
794 | 5ebaa27e | Frediano Ziglio | } else {
|
795 | 5ebaa27e | Frediano Ziglio | /* Note: in this case, no need to wait */
|
796 | 3d9b4925 | Michael Tokarev | qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors); |
797 | 5ebaa27e | Frediano Ziglio | } |
798 | 68d000a3 | Kevin Wolf | break;
|
799 | 68d000a3 | Kevin Wolf | |
800 | 6377af48 | Kevin Wolf | case QCOW2_CLUSTER_ZERO:
|
801 | 3d9b4925 | Michael Tokarev | qemu_iovec_memset(&hd_qiov, 0, 0, 512 * cur_nr_sectors); |
802 | 6377af48 | Kevin Wolf | break;
|
803 | 6377af48 | Kevin Wolf | |
804 | 68d000a3 | Kevin Wolf | case QCOW2_CLUSTER_COMPRESSED:
|
805 | 5ebaa27e | Frediano Ziglio | /* add AIO support for compressed blocks ? */
|
806 | 5ebaa27e | Frediano Ziglio | ret = qcow2_decompress_cluster(bs, cluster_offset); |
807 | 5ebaa27e | Frediano Ziglio | if (ret < 0) { |
808 | 3fc48d09 | Frediano Ziglio | goto fail;
|
809 | bd28f835 | Kevin Wolf | } |
810 | bd28f835 | Kevin Wolf | |
811 | 03396148 | Michael Tokarev | qemu_iovec_from_buf(&hd_qiov, 0,
|
812 | 5ebaa27e | Frediano Ziglio | s->cluster_cache + index_in_cluster * 512,
|
813 | faf575c1 | Frediano Ziglio | 512 * cur_nr_sectors);
|
814 | 68d000a3 | Kevin Wolf | break;
|
815 | 68d000a3 | Kevin Wolf | |
816 | 68d000a3 | Kevin Wolf | case QCOW2_CLUSTER_NORMAL:
|
817 | 5ebaa27e | Frediano Ziglio | if ((cluster_offset & 511) != 0) { |
818 | 3fc48d09 | Frediano Ziglio | ret = -EIO; |
819 | 3fc48d09 | Frediano Ziglio | goto fail;
|
820 | 5ebaa27e | Frediano Ziglio | } |
821 | bd28f835 | Kevin Wolf | |
822 | 5ebaa27e | Frediano Ziglio | if (s->crypt_method) {
|
823 | 5ebaa27e | Frediano Ziglio | /*
|
824 | 5ebaa27e | Frediano Ziglio | * For encrypted images, read everything into a temporary
|
825 | 5ebaa27e | Frediano Ziglio | * contiguous buffer on which the AES functions can work.
|
826 | 5ebaa27e | Frediano Ziglio | */
|
827 | 3fc48d09 | Frediano Ziglio | if (!cluster_data) {
|
828 | 3fc48d09 | Frediano Ziglio | cluster_data = |
829 | dea43a65 | Frediano Ziglio | qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
830 | 5ebaa27e | Frediano Ziglio | } |
831 | 5ebaa27e | Frediano Ziglio | |
832 | 5ebaa27e | Frediano Ziglio | assert(cur_nr_sectors <= |
833 | 5ebaa27e | Frediano Ziglio | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors); |
834 | 3fc48d09 | Frediano Ziglio | qemu_iovec_reset(&hd_qiov); |
835 | 3fc48d09 | Frediano Ziglio | qemu_iovec_add(&hd_qiov, cluster_data, |
836 | 5ebaa27e | Frediano Ziglio | 512 * cur_nr_sectors);
|
837 | 5ebaa27e | Frediano Ziglio | } |
838 | 5ebaa27e | Frediano Ziglio | |
839 | 5ebaa27e | Frediano Ziglio | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); |
840 | 5ebaa27e | Frediano Ziglio | qemu_co_mutex_unlock(&s->lock); |
841 | 5ebaa27e | Frediano Ziglio | ret = bdrv_co_readv(bs->file, |
842 | 5ebaa27e | Frediano Ziglio | (cluster_offset >> 9) + index_in_cluster,
|
843 | 3fc48d09 | Frediano Ziglio | cur_nr_sectors, &hd_qiov); |
844 | 5ebaa27e | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
845 | 5ebaa27e | Frediano Ziglio | if (ret < 0) { |
846 | 3fc48d09 | Frediano Ziglio | goto fail;
|
847 | 5ebaa27e | Frediano Ziglio | } |
848 | 5ebaa27e | Frediano Ziglio | if (s->crypt_method) {
|
849 | 3fc48d09 | Frediano Ziglio | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
850 | 3fc48d09 | Frediano Ziglio | cluster_data, cur_nr_sectors, 0, &s->aes_decrypt_key);
|
851 | 03396148 | Michael Tokarev | qemu_iovec_from_buf(qiov, bytes_done, |
852 | 03396148 | Michael Tokarev | cluster_data, 512 * cur_nr_sectors);
|
853 | 5ebaa27e | Frediano Ziglio | } |
854 | 68d000a3 | Kevin Wolf | break;
|
855 | 68d000a3 | Kevin Wolf | |
856 | 68d000a3 | Kevin Wolf | default:
|
857 | 68d000a3 | Kevin Wolf | g_assert_not_reached(); |
858 | 68d000a3 | Kevin Wolf | ret = -EIO; |
859 | 68d000a3 | Kevin Wolf | goto fail;
|
860 | faf575c1 | Frediano Ziglio | } |
861 | f141eafe | aliguori | |
862 | 3fc48d09 | Frediano Ziglio | remaining_sectors -= cur_nr_sectors; |
863 | 3fc48d09 | Frediano Ziglio | sector_num += cur_nr_sectors; |
864 | 3fc48d09 | Frediano Ziglio | bytes_done += cur_nr_sectors * 512;
|
865 | 5ebaa27e | Frediano Ziglio | } |
866 | 3fc48d09 | Frediano Ziglio | ret = 0;
|
867 | faf575c1 | Frediano Ziglio | |
868 | 3fc48d09 | Frediano Ziglio | fail:
|
869 | 68d100e9 | Kevin Wolf | qemu_co_mutex_unlock(&s->lock); |
870 | 42496d62 | Kevin Wolf | |
871 | 3fc48d09 | Frediano Ziglio | qemu_iovec_destroy(&hd_qiov); |
872 | dea43a65 | Frediano Ziglio | qemu_vfree(cluster_data); |
873 | 68d100e9 | Kevin Wolf | |
874 | 68d100e9 | Kevin Wolf | return ret;
|
875 | 585f8587 | bellard | } |
876 | 585f8587 | bellard | |
877 | a968168c | Dong Xu Wang | static coroutine_fn int qcow2_co_writev(BlockDriverState *bs, |
878 | 3fc48d09 | Frediano Ziglio | int64_t sector_num, |
879 | 3fc48d09 | Frediano Ziglio | int remaining_sectors,
|
880 | 3fc48d09 | Frediano Ziglio | QEMUIOVector *qiov) |
881 | 585f8587 | bellard | { |
882 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
883 | 585f8587 | bellard | int index_in_cluster;
|
884 | 095a9c58 | aliguori | int n_end;
|
885 | 68d100e9 | Kevin Wolf | int ret;
|
886 | faf575c1 | Frediano Ziglio | int cur_nr_sectors; /* number of sectors in current iteration */ |
887 | c2bdd990 | Frediano Ziglio | uint64_t cluster_offset; |
888 | 3fc48d09 | Frediano Ziglio | QEMUIOVector hd_qiov; |
889 | 3fc48d09 | Frediano Ziglio | uint64_t bytes_done = 0;
|
890 | 3fc48d09 | Frediano Ziglio | uint8_t *cluster_data = NULL;
|
891 | 8d2497c3 | Kevin Wolf | QCowL2Meta *l2meta = NULL;
|
892 | c2271403 | Frediano Ziglio | |
893 | 3cce16f4 | Kevin Wolf | trace_qcow2_writev_start_req(qemu_coroutine_self(), sector_num, |
894 | 3cce16f4 | Kevin Wolf | remaining_sectors); |
895 | 3cce16f4 | Kevin Wolf | |
896 | 3fc48d09 | Frediano Ziglio | qemu_iovec_init(&hd_qiov, qiov->niov); |
897 | 3fc48d09 | Frediano Ziglio | |
898 | 3fc48d09 | Frediano Ziglio | s->cluster_cache_offset = -1; /* disable compressed cache */ |
899 | 3b46e624 | ths | |
900 | 3fc48d09 | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
901 | 3fc48d09 | Frediano Ziglio | |
902 | 3fc48d09 | Frediano Ziglio | while (remaining_sectors != 0) { |
903 | 3fc48d09 | Frediano Ziglio | |
904 | f50f88b9 | Kevin Wolf | l2meta = NULL;
|
905 | cf5c1a23 | Kevin Wolf | |
906 | 3cce16f4 | Kevin Wolf | trace_qcow2_writev_start_part(qemu_coroutine_self()); |
907 | 3fc48d09 | Frediano Ziglio | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
908 | 3fc48d09 | Frediano Ziglio | n_end = index_in_cluster + remaining_sectors; |
909 | 5ebaa27e | Frediano Ziglio | if (s->crypt_method &&
|
910 | 5ebaa27e | Frediano Ziglio | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) { |
911 | 5ebaa27e | Frediano Ziglio | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; |
912 | 5ebaa27e | Frediano Ziglio | } |
913 | 095a9c58 | aliguori | |
914 | 3fc48d09 | Frediano Ziglio | ret = qcow2_alloc_cluster_offset(bs, sector_num << 9,
|
915 | f50f88b9 | Kevin Wolf | index_in_cluster, n_end, &cur_nr_sectors, &cluster_offset, &l2meta); |
916 | 5ebaa27e | Frediano Ziglio | if (ret < 0) { |
917 | 3fc48d09 | Frediano Ziglio | goto fail;
|
918 | 5ebaa27e | Frediano Ziglio | } |
919 | 148da7ea | Kevin Wolf | |
920 | 5ebaa27e | Frediano Ziglio | assert((cluster_offset & 511) == 0); |
921 | 148da7ea | Kevin Wolf | |
922 | 3fc48d09 | Frediano Ziglio | qemu_iovec_reset(&hd_qiov); |
923 | 1b093c48 | Michael Tokarev | qemu_iovec_concat(&hd_qiov, qiov, bytes_done, |
924 | 5ebaa27e | Frediano Ziglio | cur_nr_sectors * 512);
|
925 | 6f5f060b | Kevin Wolf | |
926 | 5ebaa27e | Frediano Ziglio | if (s->crypt_method) {
|
927 | 3fc48d09 | Frediano Ziglio | if (!cluster_data) {
|
928 | dea43a65 | Frediano Ziglio | cluster_data = qemu_blockalign(bs, QCOW_MAX_CRYPT_CLUSTERS * |
929 | 5ebaa27e | Frediano Ziglio | s->cluster_size); |
930 | 5ebaa27e | Frediano Ziglio | } |
931 | 6f5f060b | Kevin Wolf | |
932 | 3fc48d09 | Frediano Ziglio | assert(hd_qiov.size <= |
933 | 5ebaa27e | Frediano Ziglio | QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size); |
934 | d5e6b161 | Michael Tokarev | qemu_iovec_to_buf(&hd_qiov, 0, cluster_data, hd_qiov.size);
|
935 | 6f5f060b | Kevin Wolf | |
936 | 3fc48d09 | Frediano Ziglio | qcow2_encrypt_sectors(s, sector_num, cluster_data, |
937 | 3fc48d09 | Frediano Ziglio | cluster_data, cur_nr_sectors, 1, &s->aes_encrypt_key);
|
938 | 6f5f060b | Kevin Wolf | |
939 | 3fc48d09 | Frediano Ziglio | qemu_iovec_reset(&hd_qiov); |
940 | 3fc48d09 | Frediano Ziglio | qemu_iovec_add(&hd_qiov, cluster_data, |
941 | 5ebaa27e | Frediano Ziglio | cur_nr_sectors * 512);
|
942 | 5ebaa27e | Frediano Ziglio | } |
943 | 6f5f060b | Kevin Wolf | |
944 | cf93980e | Max Reitz | ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, |
945 | cf93980e | Max Reitz | cluster_offset + index_in_cluster * BDRV_SECTOR_SIZE, |
946 | cf93980e | Max Reitz | cur_nr_sectors * BDRV_SECTOR_SIZE); |
947 | cf93980e | Max Reitz | if (ret < 0) { |
948 | cf93980e | Max Reitz | goto fail;
|
949 | cf93980e | Max Reitz | } |
950 | cf93980e | Max Reitz | |
951 | 5ebaa27e | Frediano Ziglio | qemu_co_mutex_unlock(&s->lock); |
952 | 67a7a0eb | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
953 | 3cce16f4 | Kevin Wolf | trace_qcow2_writev_data(qemu_coroutine_self(), |
954 | 3cce16f4 | Kevin Wolf | (cluster_offset >> 9) + index_in_cluster);
|
955 | 5ebaa27e | Frediano Ziglio | ret = bdrv_co_writev(bs->file, |
956 | 5ebaa27e | Frediano Ziglio | (cluster_offset >> 9) + index_in_cluster,
|
957 | 3fc48d09 | Frediano Ziglio | cur_nr_sectors, &hd_qiov); |
958 | 5ebaa27e | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
959 | 5ebaa27e | Frediano Ziglio | if (ret < 0) { |
960 | 3fc48d09 | Frediano Ziglio | goto fail;
|
961 | 5ebaa27e | Frediano Ziglio | } |
962 | f141eafe | aliguori | |
963 | 88c6588c | Kevin Wolf | while (l2meta != NULL) { |
964 | 88c6588c | Kevin Wolf | QCowL2Meta *next; |
965 | 88c6588c | Kevin Wolf | |
966 | f50f88b9 | Kevin Wolf | ret = qcow2_alloc_cluster_link_l2(bs, l2meta); |
967 | f50f88b9 | Kevin Wolf | if (ret < 0) { |
968 | f50f88b9 | Kevin Wolf | goto fail;
|
969 | f50f88b9 | Kevin Wolf | } |
970 | faf575c1 | Frediano Ziglio | |
971 | 4e95314e | Kevin Wolf | /* Take the request off the list of running requests */
|
972 | 4e95314e | Kevin Wolf | if (l2meta->nb_clusters != 0) { |
973 | 4e95314e | Kevin Wolf | QLIST_REMOVE(l2meta, next_in_flight); |
974 | 4e95314e | Kevin Wolf | } |
975 | 4e95314e | Kevin Wolf | |
976 | 4e95314e | Kevin Wolf | qemu_co_queue_restart_all(&l2meta->dependent_requests); |
977 | 4e95314e | Kevin Wolf | |
978 | 88c6588c | Kevin Wolf | next = l2meta->next; |
979 | f50f88b9 | Kevin Wolf | g_free(l2meta); |
980 | 88c6588c | Kevin Wolf | l2meta = next; |
981 | f50f88b9 | Kevin Wolf | } |
982 | 0fa9131a | Kevin Wolf | |
983 | 3fc48d09 | Frediano Ziglio | remaining_sectors -= cur_nr_sectors; |
984 | 3fc48d09 | Frediano Ziglio | sector_num += cur_nr_sectors; |
985 | 3fc48d09 | Frediano Ziglio | bytes_done += cur_nr_sectors * 512;
|
986 | 3cce16f4 | Kevin Wolf | trace_qcow2_writev_done_part(qemu_coroutine_self(), cur_nr_sectors); |
987 | 5ebaa27e | Frediano Ziglio | } |
988 | 3fc48d09 | Frediano Ziglio | ret = 0;
|
989 | faf575c1 | Frediano Ziglio | |
990 | 3fc48d09 | Frediano Ziglio | fail:
|
991 | 4e95314e | Kevin Wolf | qemu_co_mutex_unlock(&s->lock); |
992 | 4e95314e | Kevin Wolf | |
993 | 88c6588c | Kevin Wolf | while (l2meta != NULL) { |
994 | 88c6588c | Kevin Wolf | QCowL2Meta *next; |
995 | 88c6588c | Kevin Wolf | |
996 | 4e95314e | Kevin Wolf | if (l2meta->nb_clusters != 0) { |
997 | 4e95314e | Kevin Wolf | QLIST_REMOVE(l2meta, next_in_flight); |
998 | 4e95314e | Kevin Wolf | } |
999 | 4e95314e | Kevin Wolf | qemu_co_queue_restart_all(&l2meta->dependent_requests); |
1000 | 88c6588c | Kevin Wolf | |
1001 | 88c6588c | Kevin Wolf | next = l2meta->next; |
1002 | cf5c1a23 | Kevin Wolf | g_free(l2meta); |
1003 | 88c6588c | Kevin Wolf | l2meta = next; |
1004 | cf5c1a23 | Kevin Wolf | } |
1005 | 0fa9131a | Kevin Wolf | |
1006 | 3fc48d09 | Frediano Ziglio | qemu_iovec_destroy(&hd_qiov); |
1007 | dea43a65 | Frediano Ziglio | qemu_vfree(cluster_data); |
1008 | 3cce16f4 | Kevin Wolf | trace_qcow2_writev_done_req(qemu_coroutine_self(), ret); |
1009 | 42496d62 | Kevin Wolf | |
1010 | 68d100e9 | Kevin Wolf | return ret;
|
1011 | 585f8587 | bellard | } |
1012 | 585f8587 | bellard | |
1013 | 7c80ab3f | Jes Sorensen | static void qcow2_close(BlockDriverState *bs) |
1014 | 585f8587 | bellard | { |
1015 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
1016 | 7267c094 | Anthony Liguori | g_free(s->l1_table); |
1017 | cf93980e | Max Reitz | /* else pre-write overlap checks in cache_destroy may crash */
|
1018 | cf93980e | Max Reitz | s->l1_table = NULL;
|
1019 | 29c1a730 | Kevin Wolf | |
1020 | 29c1a730 | Kevin Wolf | qcow2_cache_flush(bs, s->l2_table_cache); |
1021 | 29c1a730 | Kevin Wolf | qcow2_cache_flush(bs, s->refcount_block_cache); |
1022 | 29c1a730 | Kevin Wolf | |
1023 | c61d0004 | Stefan Hajnoczi | qcow2_mark_clean(bs); |
1024 | c61d0004 | Stefan Hajnoczi | |
1025 | 29c1a730 | Kevin Wolf | qcow2_cache_destroy(bs, s->l2_table_cache); |
1026 | 29c1a730 | Kevin Wolf | qcow2_cache_destroy(bs, s->refcount_block_cache); |
1027 | 29c1a730 | Kevin Wolf | |
1028 | 6744cbab | Kevin Wolf | g_free(s->unknown_header_fields); |
1029 | 75bab85c | Kevin Wolf | cleanup_unknown_header_ext(bs); |
1030 | 6744cbab | Kevin Wolf | |
1031 | 7267c094 | Anthony Liguori | g_free(s->cluster_cache); |
1032 | dea43a65 | Frediano Ziglio | qemu_vfree(s->cluster_data); |
1033 | ed6ccf0f | Kevin Wolf | qcow2_refcount_close(bs); |
1034 | 28c1202b | Li Zhi Hui | qcow2_free_snapshots(bs); |
1035 | 585f8587 | bellard | } |
1036 | 585f8587 | bellard | |
1037 | 06d9260f | Anthony Liguori | static void qcow2_invalidate_cache(BlockDriverState *bs) |
1038 | 06d9260f | Anthony Liguori | { |
1039 | 06d9260f | Anthony Liguori | BDRVQcowState *s = bs->opaque; |
1040 | 06d9260f | Anthony Liguori | int flags = s->flags;
|
1041 | 06d9260f | Anthony Liguori | AES_KEY aes_encrypt_key; |
1042 | 06d9260f | Anthony Liguori | AES_KEY aes_decrypt_key; |
1043 | 06d9260f | Anthony Liguori | uint32_t crypt_method = 0;
|
1044 | acdfb480 | Kevin Wolf | QDict *options; |
1045 | 06d9260f | Anthony Liguori | |
1046 | 06d9260f | Anthony Liguori | /*
|
1047 | 06d9260f | Anthony Liguori | * Backing files are read-only which makes all of their metadata immutable,
|
1048 | 06d9260f | Anthony Liguori | * that means we don't have to worry about reopening them here.
|
1049 | 06d9260f | Anthony Liguori | */
|
1050 | 06d9260f | Anthony Liguori | |
1051 | 06d9260f | Anthony Liguori | if (s->crypt_method) {
|
1052 | 06d9260f | Anthony Liguori | crypt_method = s->crypt_method; |
1053 | 06d9260f | Anthony Liguori | memcpy(&aes_encrypt_key, &s->aes_encrypt_key, sizeof(aes_encrypt_key));
|
1054 | 06d9260f | Anthony Liguori | memcpy(&aes_decrypt_key, &s->aes_decrypt_key, sizeof(aes_decrypt_key));
|
1055 | 06d9260f | Anthony Liguori | } |
1056 | 06d9260f | Anthony Liguori | |
1057 | 06d9260f | Anthony Liguori | qcow2_close(bs); |
1058 | 06d9260f | Anthony Liguori | |
1059 | acdfb480 | Kevin Wolf | options = qdict_new(); |
1060 | acdfb480 | Kevin Wolf | qdict_put(options, QCOW2_OPT_LAZY_REFCOUNTS, |
1061 | acdfb480 | Kevin Wolf | qbool_from_int(s->use_lazy_refcounts)); |
1062 | acdfb480 | Kevin Wolf | |
1063 | 06d9260f | Anthony Liguori | memset(s, 0, sizeof(BDRVQcowState)); |
1064 | 015a1036 | Max Reitz | qcow2_open(bs, options, flags, NULL);
|
1065 | acdfb480 | Kevin Wolf | |
1066 | acdfb480 | Kevin Wolf | QDECREF(options); |
1067 | 06d9260f | Anthony Liguori | |
1068 | 06d9260f | Anthony Liguori | if (crypt_method) {
|
1069 | 06d9260f | Anthony Liguori | s->crypt_method = crypt_method; |
1070 | 06d9260f | Anthony Liguori | memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key));
|
1071 | 06d9260f | Anthony Liguori | memcpy(&s->aes_decrypt_key, &aes_decrypt_key, sizeof(aes_decrypt_key));
|
1072 | 06d9260f | Anthony Liguori | } |
1073 | 06d9260f | Anthony Liguori | } |
1074 | 06d9260f | Anthony Liguori | |
1075 | e24e49e6 | Kevin Wolf | static size_t header_ext_add(char *buf, uint32_t magic, const void *s, |
1076 | e24e49e6 | Kevin Wolf | size_t len, size_t buflen) |
1077 | e24e49e6 | Kevin Wolf | { |
1078 | e24e49e6 | Kevin Wolf | QCowExtension *ext_backing_fmt = (QCowExtension*) buf; |
1079 | e24e49e6 | Kevin Wolf | size_t ext_len = sizeof(QCowExtension) + ((len + 7) & ~7); |
1080 | e24e49e6 | Kevin Wolf | |
1081 | e24e49e6 | Kevin Wolf | if (buflen < ext_len) {
|
1082 | e24e49e6 | Kevin Wolf | return -ENOSPC;
|
1083 | e24e49e6 | Kevin Wolf | } |
1084 | e24e49e6 | Kevin Wolf | |
1085 | e24e49e6 | Kevin Wolf | *ext_backing_fmt = (QCowExtension) { |
1086 | e24e49e6 | Kevin Wolf | .magic = cpu_to_be32(magic), |
1087 | e24e49e6 | Kevin Wolf | .len = cpu_to_be32(len), |
1088 | e24e49e6 | Kevin Wolf | }; |
1089 | e24e49e6 | Kevin Wolf | memcpy(buf + sizeof(QCowExtension), s, len);
|
1090 | e24e49e6 | Kevin Wolf | |
1091 | e24e49e6 | Kevin Wolf | return ext_len;
|
1092 | e24e49e6 | Kevin Wolf | } |
1093 | e24e49e6 | Kevin Wolf | |
1094 | 756e6736 | Kevin Wolf | /*
|
1095 | e24e49e6 | Kevin Wolf | * Updates the qcow2 header, including the variable length parts of it, i.e.
|
1096 | e24e49e6 | Kevin Wolf | * the backing file name and all extensions. qcow2 was not designed to allow
|
1097 | e24e49e6 | Kevin Wolf | * such changes, so if we run out of space (we can only use the first cluster)
|
1098 | e24e49e6 | Kevin Wolf | * this function may fail.
|
1099 | 756e6736 | Kevin Wolf | *
|
1100 | 756e6736 | Kevin Wolf | * Returns 0 on success, -errno in error cases.
|
1101 | 756e6736 | Kevin Wolf | */
|
1102 | e24e49e6 | Kevin Wolf | int qcow2_update_header(BlockDriverState *bs)
|
1103 | 756e6736 | Kevin Wolf | { |
1104 | 756e6736 | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
1105 | e24e49e6 | Kevin Wolf | QCowHeader *header; |
1106 | e24e49e6 | Kevin Wolf | char *buf;
|
1107 | e24e49e6 | Kevin Wolf | size_t buflen = s->cluster_size; |
1108 | 756e6736 | Kevin Wolf | int ret;
|
1109 | e24e49e6 | Kevin Wolf | uint64_t total_size; |
1110 | e24e49e6 | Kevin Wolf | uint32_t refcount_table_clusters; |
1111 | 6744cbab | Kevin Wolf | size_t header_length; |
1112 | 75bab85c | Kevin Wolf | Qcow2UnknownHeaderExtension *uext; |
1113 | 756e6736 | Kevin Wolf | |
1114 | e24e49e6 | Kevin Wolf | buf = qemu_blockalign(bs, buflen); |
1115 | 756e6736 | Kevin Wolf | |
1116 | e24e49e6 | Kevin Wolf | /* Header structure */
|
1117 | e24e49e6 | Kevin Wolf | header = (QCowHeader*) buf; |
1118 | 756e6736 | Kevin Wolf | |
1119 | e24e49e6 | Kevin Wolf | if (buflen < sizeof(*header)) { |
1120 | e24e49e6 | Kevin Wolf | ret = -ENOSPC; |
1121 | e24e49e6 | Kevin Wolf | goto fail;
|
1122 | 756e6736 | Kevin Wolf | } |
1123 | 756e6736 | Kevin Wolf | |
1124 | 6744cbab | Kevin Wolf | header_length = sizeof(*header) + s->unknown_header_fields_size;
|
1125 | e24e49e6 | Kevin Wolf | total_size = bs->total_sectors * BDRV_SECTOR_SIZE; |
1126 | e24e49e6 | Kevin Wolf | refcount_table_clusters = s->refcount_table_size >> (s->cluster_bits - 3);
|
1127 | e24e49e6 | Kevin Wolf | |
1128 | e24e49e6 | Kevin Wolf | *header = (QCowHeader) { |
1129 | 6744cbab | Kevin Wolf | /* Version 2 fields */
|
1130 | e24e49e6 | Kevin Wolf | .magic = cpu_to_be32(QCOW_MAGIC), |
1131 | 6744cbab | Kevin Wolf | .version = cpu_to_be32(s->qcow_version), |
1132 | e24e49e6 | Kevin Wolf | .backing_file_offset = 0,
|
1133 | e24e49e6 | Kevin Wolf | .backing_file_size = 0,
|
1134 | e24e49e6 | Kevin Wolf | .cluster_bits = cpu_to_be32(s->cluster_bits), |
1135 | e24e49e6 | Kevin Wolf | .size = cpu_to_be64(total_size), |
1136 | e24e49e6 | Kevin Wolf | .crypt_method = cpu_to_be32(s->crypt_method_header), |
1137 | e24e49e6 | Kevin Wolf | .l1_size = cpu_to_be32(s->l1_size), |
1138 | e24e49e6 | Kevin Wolf | .l1_table_offset = cpu_to_be64(s->l1_table_offset), |
1139 | e24e49e6 | Kevin Wolf | .refcount_table_offset = cpu_to_be64(s->refcount_table_offset), |
1140 | e24e49e6 | Kevin Wolf | .refcount_table_clusters = cpu_to_be32(refcount_table_clusters), |
1141 | e24e49e6 | Kevin Wolf | .nb_snapshots = cpu_to_be32(s->nb_snapshots), |
1142 | e24e49e6 | Kevin Wolf | .snapshots_offset = cpu_to_be64(s->snapshots_offset), |
1143 | 6744cbab | Kevin Wolf | |
1144 | 6744cbab | Kevin Wolf | /* Version 3 fields */
|
1145 | 6744cbab | Kevin Wolf | .incompatible_features = cpu_to_be64(s->incompatible_features), |
1146 | 6744cbab | Kevin Wolf | .compatible_features = cpu_to_be64(s->compatible_features), |
1147 | 6744cbab | Kevin Wolf | .autoclear_features = cpu_to_be64(s->autoclear_features), |
1148 | b6481f37 | Max Reitz | .refcount_order = cpu_to_be32(s->refcount_order), |
1149 | 6744cbab | Kevin Wolf | .header_length = cpu_to_be32(header_length), |
1150 | e24e49e6 | Kevin Wolf | }; |
1151 | 756e6736 | Kevin Wolf | |
1152 | 6744cbab | Kevin Wolf | /* For older versions, write a shorter header */
|
1153 | 6744cbab | Kevin Wolf | switch (s->qcow_version) {
|
1154 | 6744cbab | Kevin Wolf | case 2: |
1155 | 6744cbab | Kevin Wolf | ret = offsetof(QCowHeader, incompatible_features); |
1156 | 6744cbab | Kevin Wolf | break;
|
1157 | 6744cbab | Kevin Wolf | case 3: |
1158 | 6744cbab | Kevin Wolf | ret = sizeof(*header);
|
1159 | 6744cbab | Kevin Wolf | break;
|
1160 | 6744cbab | Kevin Wolf | default:
|
1161 | b6c14762 | Jim Meyering | ret = -EINVAL; |
1162 | b6c14762 | Jim Meyering | goto fail;
|
1163 | 6744cbab | Kevin Wolf | } |
1164 | 6744cbab | Kevin Wolf | |
1165 | 6744cbab | Kevin Wolf | buf += ret; |
1166 | 6744cbab | Kevin Wolf | buflen -= ret; |
1167 | 6744cbab | Kevin Wolf | memset(buf, 0, buflen);
|
1168 | 6744cbab | Kevin Wolf | |
1169 | 6744cbab | Kevin Wolf | /* Preserve any unknown field in the header */
|
1170 | 6744cbab | Kevin Wolf | if (s->unknown_header_fields_size) {
|
1171 | 6744cbab | Kevin Wolf | if (buflen < s->unknown_header_fields_size) {
|
1172 | 6744cbab | Kevin Wolf | ret = -ENOSPC; |
1173 | 6744cbab | Kevin Wolf | goto fail;
|
1174 | 6744cbab | Kevin Wolf | } |
1175 | 6744cbab | Kevin Wolf | |
1176 | 6744cbab | Kevin Wolf | memcpy(buf, s->unknown_header_fields, s->unknown_header_fields_size); |
1177 | 6744cbab | Kevin Wolf | buf += s->unknown_header_fields_size; |
1178 | 6744cbab | Kevin Wolf | buflen -= s->unknown_header_fields_size; |
1179 | 6744cbab | Kevin Wolf | } |
1180 | 756e6736 | Kevin Wolf | |
1181 | e24e49e6 | Kevin Wolf | /* Backing file format header extension */
|
1182 | e24e49e6 | Kevin Wolf | if (*bs->backing_format) {
|
1183 | e24e49e6 | Kevin Wolf | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_BACKING_FORMAT, |
1184 | e24e49e6 | Kevin Wolf | bs->backing_format, strlen(bs->backing_format), |
1185 | e24e49e6 | Kevin Wolf | buflen); |
1186 | e24e49e6 | Kevin Wolf | if (ret < 0) { |
1187 | e24e49e6 | Kevin Wolf | goto fail;
|
1188 | 756e6736 | Kevin Wolf | } |
1189 | 756e6736 | Kevin Wolf | |
1190 | e24e49e6 | Kevin Wolf | buf += ret; |
1191 | e24e49e6 | Kevin Wolf | buflen -= ret; |
1192 | 756e6736 | Kevin Wolf | } |
1193 | 756e6736 | Kevin Wolf | |
1194 | cfcc4c62 | Kevin Wolf | /* Feature table */
|
1195 | cfcc4c62 | Kevin Wolf | Qcow2Feature features[] = { |
1196 | c61d0004 | Stefan Hajnoczi | { |
1197 | c61d0004 | Stefan Hajnoczi | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, |
1198 | c61d0004 | Stefan Hajnoczi | .bit = QCOW2_INCOMPAT_DIRTY_BITNR, |
1199 | c61d0004 | Stefan Hajnoczi | .name = "dirty bit",
|
1200 | c61d0004 | Stefan Hajnoczi | }, |
1201 | bfe8043e | Stefan Hajnoczi | { |
1202 | 69c98726 | Max Reitz | .type = QCOW2_FEAT_TYPE_INCOMPATIBLE, |
1203 | 69c98726 | Max Reitz | .bit = QCOW2_INCOMPAT_CORRUPT_BITNR, |
1204 | 69c98726 | Max Reitz | .name = "corrupt bit",
|
1205 | 69c98726 | Max Reitz | }, |
1206 | 69c98726 | Max Reitz | { |
1207 | bfe8043e | Stefan Hajnoczi | .type = QCOW2_FEAT_TYPE_COMPATIBLE, |
1208 | bfe8043e | Stefan Hajnoczi | .bit = QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR, |
1209 | bfe8043e | Stefan Hajnoczi | .name = "lazy refcounts",
|
1210 | bfe8043e | Stefan Hajnoczi | }, |
1211 | cfcc4c62 | Kevin Wolf | }; |
1212 | cfcc4c62 | Kevin Wolf | |
1213 | cfcc4c62 | Kevin Wolf | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_FEATURE_TABLE, |
1214 | cfcc4c62 | Kevin Wolf | features, sizeof(features), buflen);
|
1215 | cfcc4c62 | Kevin Wolf | if (ret < 0) { |
1216 | cfcc4c62 | Kevin Wolf | goto fail;
|
1217 | cfcc4c62 | Kevin Wolf | } |
1218 | cfcc4c62 | Kevin Wolf | buf += ret; |
1219 | cfcc4c62 | Kevin Wolf | buflen -= ret; |
1220 | cfcc4c62 | Kevin Wolf | |
1221 | 75bab85c | Kevin Wolf | /* Keep unknown header extensions */
|
1222 | 75bab85c | Kevin Wolf | QLIST_FOREACH(uext, &s->unknown_header_ext, next) { |
1223 | 75bab85c | Kevin Wolf | ret = header_ext_add(buf, uext->magic, uext->data, uext->len, buflen); |
1224 | 75bab85c | Kevin Wolf | if (ret < 0) { |
1225 | 75bab85c | Kevin Wolf | goto fail;
|
1226 | 75bab85c | Kevin Wolf | } |
1227 | 75bab85c | Kevin Wolf | |
1228 | 75bab85c | Kevin Wolf | buf += ret; |
1229 | 75bab85c | Kevin Wolf | buflen -= ret; |
1230 | 75bab85c | Kevin Wolf | } |
1231 | 75bab85c | Kevin Wolf | |
1232 | e24e49e6 | Kevin Wolf | /* End of header extensions */
|
1233 | e24e49e6 | Kevin Wolf | ret = header_ext_add(buf, QCOW2_EXT_MAGIC_END, NULL, 0, buflen); |
1234 | 756e6736 | Kevin Wolf | if (ret < 0) { |
1235 | 756e6736 | Kevin Wolf | goto fail;
|
1236 | 756e6736 | Kevin Wolf | } |
1237 | 756e6736 | Kevin Wolf | |
1238 | e24e49e6 | Kevin Wolf | buf += ret; |
1239 | e24e49e6 | Kevin Wolf | buflen -= ret; |
1240 | 756e6736 | Kevin Wolf | |
1241 | e24e49e6 | Kevin Wolf | /* Backing file name */
|
1242 | e24e49e6 | Kevin Wolf | if (*bs->backing_file) {
|
1243 | e24e49e6 | Kevin Wolf | size_t backing_file_len = strlen(bs->backing_file); |
1244 | e24e49e6 | Kevin Wolf | |
1245 | e24e49e6 | Kevin Wolf | if (buflen < backing_file_len) {
|
1246 | e24e49e6 | Kevin Wolf | ret = -ENOSPC; |
1247 | e24e49e6 | Kevin Wolf | goto fail;
|
1248 | e24e49e6 | Kevin Wolf | } |
1249 | e24e49e6 | Kevin Wolf | |
1250 | 00ea1881 | Jim Meyering | /* Using strncpy is ok here, since buf is not NUL-terminated. */
|
1251 | e24e49e6 | Kevin Wolf | strncpy(buf, bs->backing_file, buflen); |
1252 | e24e49e6 | Kevin Wolf | |
1253 | e24e49e6 | Kevin Wolf | header->backing_file_offset = cpu_to_be64(buf - ((char*) header));
|
1254 | e24e49e6 | Kevin Wolf | header->backing_file_size = cpu_to_be32(backing_file_len); |
1255 | 756e6736 | Kevin Wolf | } |
1256 | 756e6736 | Kevin Wolf | |
1257 | e24e49e6 | Kevin Wolf | /* Write the new header */
|
1258 | e24e49e6 | Kevin Wolf | ret = bdrv_pwrite(bs->file, 0, header, s->cluster_size);
|
1259 | 756e6736 | Kevin Wolf | if (ret < 0) { |
1260 | 756e6736 | Kevin Wolf | goto fail;
|
1261 | 756e6736 | Kevin Wolf | } |
1262 | 756e6736 | Kevin Wolf | |
1263 | 756e6736 | Kevin Wolf | ret = 0;
|
1264 | 756e6736 | Kevin Wolf | fail:
|
1265 | e24e49e6 | Kevin Wolf | qemu_vfree(header); |
1266 | 756e6736 | Kevin Wolf | return ret;
|
1267 | 756e6736 | Kevin Wolf | } |
1268 | 756e6736 | Kevin Wolf | |
1269 | 756e6736 | Kevin Wolf | static int qcow2_change_backing_file(BlockDriverState *bs, |
1270 | 756e6736 | Kevin Wolf | const char *backing_file, const char *backing_fmt) |
1271 | 756e6736 | Kevin Wolf | { |
1272 | e24e49e6 | Kevin Wolf | pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); |
1273 | e24e49e6 | Kevin Wolf | pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); |
1274 | e24e49e6 | Kevin Wolf | |
1275 | e24e49e6 | Kevin Wolf | return qcow2_update_header(bs);
|
1276 | 756e6736 | Kevin Wolf | } |
1277 | 756e6736 | Kevin Wolf | |
1278 | a35e1c17 | Kevin Wolf | static int preallocate(BlockDriverState *bs) |
1279 | a35e1c17 | Kevin Wolf | { |
1280 | a35e1c17 | Kevin Wolf | uint64_t nb_sectors; |
1281 | a35e1c17 | Kevin Wolf | uint64_t offset; |
1282 | 060bee89 | Kevin Wolf | uint64_t host_offset = 0;
|
1283 | a35e1c17 | Kevin Wolf | int num;
|
1284 | 148da7ea | Kevin Wolf | int ret;
|
1285 | f50f88b9 | Kevin Wolf | QCowL2Meta *meta; |
1286 | a35e1c17 | Kevin Wolf | |
1287 | a35e1c17 | Kevin Wolf | nb_sectors = bdrv_getlength(bs) >> 9;
|
1288 | a35e1c17 | Kevin Wolf | offset = 0;
|
1289 | a35e1c17 | Kevin Wolf | |
1290 | a35e1c17 | Kevin Wolf | while (nb_sectors) {
|
1291 | a35e1c17 | Kevin Wolf | num = MIN(nb_sectors, INT_MAX >> 9);
|
1292 | 060bee89 | Kevin Wolf | ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num,
|
1293 | 060bee89 | Kevin Wolf | &host_offset, &meta); |
1294 | 148da7ea | Kevin Wolf | if (ret < 0) { |
1295 | 19dbcbf7 | Kevin Wolf | return ret;
|
1296 | a35e1c17 | Kevin Wolf | } |
1297 | a35e1c17 | Kevin Wolf | |
1298 | f50f88b9 | Kevin Wolf | ret = qcow2_alloc_cluster_link_l2(bs, meta); |
1299 | 19dbcbf7 | Kevin Wolf | if (ret < 0) { |
1300 | 6cfcb9b8 | Kevin Wolf | qcow2_free_any_clusters(bs, meta->alloc_offset, meta->nb_clusters, |
1301 | 6cfcb9b8 | Kevin Wolf | QCOW2_DISCARD_NEVER); |
1302 | 19dbcbf7 | Kevin Wolf | return ret;
|
1303 | a35e1c17 | Kevin Wolf | } |
1304 | a35e1c17 | Kevin Wolf | |
1305 | f214978a | Kevin Wolf | /* There are no dependent requests, but we need to remove our request
|
1306 | f214978a | Kevin Wolf | * from the list of in-flight requests */
|
1307 | f50f88b9 | Kevin Wolf | if (meta != NULL) { |
1308 | 4e95314e | Kevin Wolf | QLIST_REMOVE(meta, next_in_flight); |
1309 | f50f88b9 | Kevin Wolf | } |
1310 | f214978a | Kevin Wolf | |
1311 | a35e1c17 | Kevin Wolf | /* TODO Preallocate data if requested */
|
1312 | a35e1c17 | Kevin Wolf | |
1313 | a35e1c17 | Kevin Wolf | nb_sectors -= num; |
1314 | a35e1c17 | Kevin Wolf | offset += num << 9;
|
1315 | a35e1c17 | Kevin Wolf | } |
1316 | a35e1c17 | Kevin Wolf | |
1317 | a35e1c17 | Kevin Wolf | /*
|
1318 | a35e1c17 | Kevin Wolf | * It is expected that the image file is large enough to actually contain
|
1319 | a35e1c17 | Kevin Wolf | * all of the allocated clusters (otherwise we get failing reads after
|
1320 | a35e1c17 | Kevin Wolf | * EOF). Extend the image to the last allocated sector.
|
1321 | a35e1c17 | Kevin Wolf | */
|
1322 | 060bee89 | Kevin Wolf | if (host_offset != 0) { |
1323 | ea80b906 | Kevin Wolf | uint8_t buf[512];
|
1324 | ea80b906 | Kevin Wolf | memset(buf, 0, 512); |
1325 | 060bee89 | Kevin Wolf | ret = bdrv_write(bs->file, (host_offset >> 9) + num - 1, buf, 1); |
1326 | 19dbcbf7 | Kevin Wolf | if (ret < 0) { |
1327 | 19dbcbf7 | Kevin Wolf | return ret;
|
1328 | 19dbcbf7 | Kevin Wolf | } |
1329 | a35e1c17 | Kevin Wolf | } |
1330 | a35e1c17 | Kevin Wolf | |
1331 | a35e1c17 | Kevin Wolf | return 0; |
1332 | a35e1c17 | Kevin Wolf | } |
1333 | a35e1c17 | Kevin Wolf | |
1334 | 7c80ab3f | Jes Sorensen | static int qcow2_create2(const char *filename, int64_t total_size, |
1335 | 7c80ab3f | Jes Sorensen | const char *backing_file, const char *backing_format, |
1336 | 7c80ab3f | Jes Sorensen | int flags, size_t cluster_size, int prealloc, |
1337 | 6744cbab | Kevin Wolf | QEMUOptionParameter *options, int version)
|
1338 | a9420734 | Kevin Wolf | { |
1339 | 9b2260cb | Dong Xu Wang | /* Calculate cluster_bits */
|
1340 | a9420734 | Kevin Wolf | int cluster_bits;
|
1341 | a9420734 | Kevin Wolf | cluster_bits = ffs(cluster_size) - 1;
|
1342 | a9420734 | Kevin Wolf | if (cluster_bits < MIN_CLUSTER_BITS || cluster_bits > MAX_CLUSTER_BITS ||
|
1343 | a9420734 | Kevin Wolf | (1 << cluster_bits) != cluster_size)
|
1344 | a9420734 | Kevin Wolf | { |
1345 | a9420734 | Kevin Wolf | error_report( |
1346 | 6daf194d | Markus Armbruster | "Cluster size must be a power of two between %d and %dk",
|
1347 | a9420734 | Kevin Wolf | 1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10)); |
1348 | a9420734 | Kevin Wolf | return -EINVAL;
|
1349 | a9420734 | Kevin Wolf | } |
1350 | a9420734 | Kevin Wolf | |
1351 | a9420734 | Kevin Wolf | /*
|
1352 | a9420734 | Kevin Wolf | * Open the image file and write a minimal qcow2 header.
|
1353 | a9420734 | Kevin Wolf | *
|
1354 | a9420734 | Kevin Wolf | * We keep things simple and start with a zero-sized image. We also
|
1355 | a9420734 | Kevin Wolf | * do without refcount blocks or a L1 table for now. We'll fix the
|
1356 | a9420734 | Kevin Wolf | * inconsistency later.
|
1357 | a9420734 | Kevin Wolf | *
|
1358 | a9420734 | Kevin Wolf | * We do need a refcount table because growing the refcount table means
|
1359 | a9420734 | Kevin Wolf | * allocating two new refcount blocks - the seconds of which would be at
|
1360 | a9420734 | Kevin Wolf | * 2 GB for 64k clusters, and we don't want to have a 2 GB initial file
|
1361 | a9420734 | Kevin Wolf | * size for any qcow2 image.
|
1362 | a9420734 | Kevin Wolf | */
|
1363 | a9420734 | Kevin Wolf | BlockDriverState* bs; |
1364 | a9420734 | Kevin Wolf | QCowHeader header; |
1365 | a9420734 | Kevin Wolf | uint8_t* refcount_table; |
1366 | a9420734 | Kevin Wolf | int ret;
|
1367 | a9420734 | Kevin Wolf | |
1368 | cc84d90f | Max Reitz | ret = bdrv_create_file(filename, options, NULL);
|
1369 | a9420734 | Kevin Wolf | if (ret < 0) { |
1370 | a9420734 | Kevin Wolf | return ret;
|
1371 | a9420734 | Kevin Wolf | } |
1372 | a9420734 | Kevin Wolf | |
1373 | 34b5d2c6 | Max Reitz | ret = bdrv_file_open(&bs, filename, NULL, BDRV_O_RDWR, NULL); |
1374 | a9420734 | Kevin Wolf | if (ret < 0) { |
1375 | a9420734 | Kevin Wolf | return ret;
|
1376 | a9420734 | Kevin Wolf | } |
1377 | a9420734 | Kevin Wolf | |
1378 | a9420734 | Kevin Wolf | /* Write the header */
|
1379 | a9420734 | Kevin Wolf | memset(&header, 0, sizeof(header)); |
1380 | a9420734 | Kevin Wolf | header.magic = cpu_to_be32(QCOW_MAGIC); |
1381 | 6744cbab | Kevin Wolf | header.version = cpu_to_be32(version); |
1382 | a9420734 | Kevin Wolf | header.cluster_bits = cpu_to_be32(cluster_bits); |
1383 | a9420734 | Kevin Wolf | header.size = cpu_to_be64(0);
|
1384 | a9420734 | Kevin Wolf | header.l1_table_offset = cpu_to_be64(0);
|
1385 | a9420734 | Kevin Wolf | header.l1_size = cpu_to_be32(0);
|
1386 | a9420734 | Kevin Wolf | header.refcount_table_offset = cpu_to_be64(cluster_size); |
1387 | a9420734 | Kevin Wolf | header.refcount_table_clusters = cpu_to_be32(1);
|
1388 | 6744cbab | Kevin Wolf | header.refcount_order = cpu_to_be32(3 + REFCOUNT_SHIFT);
|
1389 | 6744cbab | Kevin Wolf | header.header_length = cpu_to_be32(sizeof(header));
|
1390 | a9420734 | Kevin Wolf | |
1391 | a9420734 | Kevin Wolf | if (flags & BLOCK_FLAG_ENCRYPT) {
|
1392 | a9420734 | Kevin Wolf | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
1393 | a9420734 | Kevin Wolf | } else {
|
1394 | a9420734 | Kevin Wolf | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
1395 | a9420734 | Kevin Wolf | } |
1396 | a9420734 | Kevin Wolf | |
1397 | bfe8043e | Stefan Hajnoczi | if (flags & BLOCK_FLAG_LAZY_REFCOUNTS) {
|
1398 | bfe8043e | Stefan Hajnoczi | header.compatible_features |= |
1399 | bfe8043e | Stefan Hajnoczi | cpu_to_be64(QCOW2_COMPAT_LAZY_REFCOUNTS); |
1400 | bfe8043e | Stefan Hajnoczi | } |
1401 | bfe8043e | Stefan Hajnoczi | |
1402 | a9420734 | Kevin Wolf | ret = bdrv_pwrite(bs, 0, &header, sizeof(header)); |
1403 | a9420734 | Kevin Wolf | if (ret < 0) { |
1404 | a9420734 | Kevin Wolf | goto out;
|
1405 | a9420734 | Kevin Wolf | } |
1406 | a9420734 | Kevin Wolf | |
1407 | a9420734 | Kevin Wolf | /* Write an empty refcount table */
|
1408 | 7267c094 | Anthony Liguori | refcount_table = g_malloc0(cluster_size); |
1409 | a9420734 | Kevin Wolf | ret = bdrv_pwrite(bs, cluster_size, refcount_table, cluster_size); |
1410 | 7267c094 | Anthony Liguori | g_free(refcount_table); |
1411 | a9420734 | Kevin Wolf | |
1412 | a9420734 | Kevin Wolf | if (ret < 0) { |
1413 | a9420734 | Kevin Wolf | goto out;
|
1414 | a9420734 | Kevin Wolf | } |
1415 | a9420734 | Kevin Wolf | |
1416 | a9420734 | Kevin Wolf | bdrv_close(bs); |
1417 | a9420734 | Kevin Wolf | |
1418 | a9420734 | Kevin Wolf | /*
|
1419 | a9420734 | Kevin Wolf | * And now open the image and make it consistent first (i.e. increase the
|
1420 | a9420734 | Kevin Wolf | * refcount of the cluster that is occupied by the header and the refcount
|
1421 | a9420734 | Kevin Wolf | * table)
|
1422 | a9420734 | Kevin Wolf | */
|
1423 | a9420734 | Kevin Wolf | BlockDriver* drv = bdrv_find_format("qcow2");
|
1424 | a9420734 | Kevin Wolf | assert(drv != NULL);
|
1425 | de9c0cec | Kevin Wolf | ret = bdrv_open(bs, filename, NULL,
|
1426 | 34b5d2c6 | Max Reitz | BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv, NULL);
|
1427 | a9420734 | Kevin Wolf | if (ret < 0) { |
1428 | a9420734 | Kevin Wolf | goto out;
|
1429 | a9420734 | Kevin Wolf | } |
1430 | a9420734 | Kevin Wolf | |
1431 | a9420734 | Kevin Wolf | ret = qcow2_alloc_clusters(bs, 2 * cluster_size);
|
1432 | a9420734 | Kevin Wolf | if (ret < 0) { |
1433 | a9420734 | Kevin Wolf | goto out;
|
1434 | a9420734 | Kevin Wolf | |
1435 | a9420734 | Kevin Wolf | } else if (ret != 0) { |
1436 | a9420734 | Kevin Wolf | error_report("Huh, first cluster in empty image is already in use?");
|
1437 | a9420734 | Kevin Wolf | abort(); |
1438 | a9420734 | Kevin Wolf | } |
1439 | a9420734 | Kevin Wolf | |
1440 | a9420734 | Kevin Wolf | /* Okay, now that we have a valid image, let's give it the right size */
|
1441 | a9420734 | Kevin Wolf | ret = bdrv_truncate(bs, total_size * BDRV_SECTOR_SIZE); |
1442 | a9420734 | Kevin Wolf | if (ret < 0) { |
1443 | a9420734 | Kevin Wolf | goto out;
|
1444 | a9420734 | Kevin Wolf | } |
1445 | a9420734 | Kevin Wolf | |
1446 | a9420734 | Kevin Wolf | /* Want a backing file? There you go.*/
|
1447 | a9420734 | Kevin Wolf | if (backing_file) {
|
1448 | a9420734 | Kevin Wolf | ret = bdrv_change_backing_file(bs, backing_file, backing_format); |
1449 | a9420734 | Kevin Wolf | if (ret < 0) { |
1450 | a9420734 | Kevin Wolf | goto out;
|
1451 | a9420734 | Kevin Wolf | } |
1452 | a9420734 | Kevin Wolf | } |
1453 | a9420734 | Kevin Wolf | |
1454 | a9420734 | Kevin Wolf | /* And if we're supposed to preallocate metadata, do that now */
|
1455 | a9420734 | Kevin Wolf | if (prealloc) {
|
1456 | 15552c4a | Zhi Yong Wu | BDRVQcowState *s = bs->opaque; |
1457 | 15552c4a | Zhi Yong Wu | qemu_co_mutex_lock(&s->lock); |
1458 | a9420734 | Kevin Wolf | ret = preallocate(bs); |
1459 | 15552c4a | Zhi Yong Wu | qemu_co_mutex_unlock(&s->lock); |
1460 | a9420734 | Kevin Wolf | if (ret < 0) { |
1461 | a9420734 | Kevin Wolf | goto out;
|
1462 | a9420734 | Kevin Wolf | } |
1463 | a9420734 | Kevin Wolf | } |
1464 | a9420734 | Kevin Wolf | |
1465 | a9420734 | Kevin Wolf | ret = 0;
|
1466 | a9420734 | Kevin Wolf | out:
|
1467 | 4f6fd349 | Fam Zheng | bdrv_unref(bs); |
1468 | a9420734 | Kevin Wolf | return ret;
|
1469 | a9420734 | Kevin Wolf | } |
1470 | de5f3f40 | Kevin Wolf | |
1471 | d5124c00 | Max Reitz | static int qcow2_create(const char *filename, QEMUOptionParameter *options, |
1472 | d5124c00 | Max Reitz | Error **errp) |
1473 | de5f3f40 | Kevin Wolf | { |
1474 | de5f3f40 | Kevin Wolf | const char *backing_file = NULL; |
1475 | de5f3f40 | Kevin Wolf | const char *backing_fmt = NULL; |
1476 | de5f3f40 | Kevin Wolf | uint64_t sectors = 0;
|
1477 | de5f3f40 | Kevin Wolf | int flags = 0; |
1478 | 99cce9fa | Kevin Wolf | size_t cluster_size = DEFAULT_CLUSTER_SIZE; |
1479 | de5f3f40 | Kevin Wolf | int prealloc = 0; |
1480 | 8ad1898c | Kevin Wolf | int version = 3; |
1481 | de5f3f40 | Kevin Wolf | |
1482 | de5f3f40 | Kevin Wolf | /* Read out options */
|
1483 | de5f3f40 | Kevin Wolf | while (options && options->name) {
|
1484 | de5f3f40 | Kevin Wolf | if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
1485 | de5f3f40 | Kevin Wolf | sectors = options->value.n / 512;
|
1486 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
1487 | de5f3f40 | Kevin Wolf | backing_file = options->value.s; |
1488 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { |
1489 | de5f3f40 | Kevin Wolf | backing_fmt = options->value.s; |
1490 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { |
1491 | de5f3f40 | Kevin Wolf | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
|
1492 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { |
1493 | de5f3f40 | Kevin Wolf | if (options->value.n) {
|
1494 | de5f3f40 | Kevin Wolf | cluster_size = options->value.n; |
1495 | de5f3f40 | Kevin Wolf | } |
1496 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { |
1497 | de5f3f40 | Kevin Wolf | if (!options->value.s || !strcmp(options->value.s, "off")) { |
1498 | de5f3f40 | Kevin Wolf | prealloc = 0;
|
1499 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->value.s, "metadata")) { |
1500 | de5f3f40 | Kevin Wolf | prealloc = 1;
|
1501 | de5f3f40 | Kevin Wolf | } else {
|
1502 | de5f3f40 | Kevin Wolf | fprintf(stderr, "Invalid preallocation mode: '%s'\n",
|
1503 | de5f3f40 | Kevin Wolf | options->value.s); |
1504 | de5f3f40 | Kevin Wolf | return -EINVAL;
|
1505 | de5f3f40 | Kevin Wolf | } |
1506 | 6744cbab | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_COMPAT_LEVEL)) { |
1507 | 9117b477 | Kevin Wolf | if (!options->value.s) {
|
1508 | 9117b477 | Kevin Wolf | /* keep the default */
|
1509 | 9117b477 | Kevin Wolf | } else if (!strcmp(options->value.s, "0.10")) { |
1510 | 6744cbab | Kevin Wolf | version = 2;
|
1511 | 6744cbab | Kevin Wolf | } else if (!strcmp(options->value.s, "1.1")) { |
1512 | 6744cbab | Kevin Wolf | version = 3;
|
1513 | 6744cbab | Kevin Wolf | } else {
|
1514 | 6744cbab | Kevin Wolf | fprintf(stderr, "Invalid compatibility level: '%s'\n",
|
1515 | 6744cbab | Kevin Wolf | options->value.s); |
1516 | 6744cbab | Kevin Wolf | return -EINVAL;
|
1517 | 6744cbab | Kevin Wolf | } |
1518 | bfe8043e | Stefan Hajnoczi | } else if (!strcmp(options->name, BLOCK_OPT_LAZY_REFCOUNTS)) { |
1519 | bfe8043e | Stefan Hajnoczi | flags |= options->value.n ? BLOCK_FLAG_LAZY_REFCOUNTS : 0;
|
1520 | de5f3f40 | Kevin Wolf | } |
1521 | de5f3f40 | Kevin Wolf | options++; |
1522 | de5f3f40 | Kevin Wolf | } |
1523 | de5f3f40 | Kevin Wolf | |
1524 | de5f3f40 | Kevin Wolf | if (backing_file && prealloc) {
|
1525 | de5f3f40 | Kevin Wolf | fprintf(stderr, "Backing file and preallocation cannot be used at "
|
1526 | de5f3f40 | Kevin Wolf | "the same time\n");
|
1527 | de5f3f40 | Kevin Wolf | return -EINVAL;
|
1528 | de5f3f40 | Kevin Wolf | } |
1529 | de5f3f40 | Kevin Wolf | |
1530 | bfe8043e | Stefan Hajnoczi | if (version < 3 && (flags & BLOCK_FLAG_LAZY_REFCOUNTS)) { |
1531 | bfe8043e | Stefan Hajnoczi | fprintf(stderr, "Lazy refcounts only supported with compatibility "
|
1532 | bfe8043e | Stefan Hajnoczi | "level 1.1 and above (use compat=1.1 or greater)\n");
|
1533 | bfe8043e | Stefan Hajnoczi | return -EINVAL;
|
1534 | bfe8043e | Stefan Hajnoczi | } |
1535 | bfe8043e | Stefan Hajnoczi | |
1536 | 7c80ab3f | Jes Sorensen | return qcow2_create2(filename, sectors, backing_file, backing_fmt, flags,
|
1537 | 6744cbab | Kevin Wolf | cluster_size, prealloc, options, version); |
1538 | de5f3f40 | Kevin Wolf | } |
1539 | de5f3f40 | Kevin Wolf | |
1540 | 7c80ab3f | Jes Sorensen | static int qcow2_make_empty(BlockDriverState *bs) |
1541 | 20d97356 | Blue Swirl | { |
1542 | 20d97356 | Blue Swirl | #if 0
|
1543 | 20d97356 | Blue Swirl | /* XXX: not correct */
|
1544 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque;
|
1545 | 20d97356 | Blue Swirl | uint32_t l1_length = s->l1_size * sizeof(uint64_t);
|
1546 | 20d97356 | Blue Swirl | int ret;
|
1547 | 20d97356 | Blue Swirl | |
1548 | 20d97356 | Blue Swirl | memset(s->l1_table, 0, l1_length);
|
1549 | 66f82cee | Kevin Wolf | if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0)
|
1550 | 20d97356 | Blue Swirl | return -1;
|
1551 | 66f82cee | Kevin Wolf | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length);
|
1552 | 20d97356 | Blue Swirl | if (ret < 0)
|
1553 | 20d97356 | Blue Swirl | return ret;
|
1554 | 20d97356 | Blue Swirl | |
1555 | 20d97356 | Blue Swirl | l2_cache_reset(bs);
|
1556 | 20d97356 | Blue Swirl | #endif
|
1557 | 20d97356 | Blue Swirl | return 0; |
1558 | 20d97356 | Blue Swirl | } |
1559 | 20d97356 | Blue Swirl | |
1560 | 621f0589 | Kevin Wolf | static coroutine_fn int qcow2_co_write_zeroes(BlockDriverState *bs, |
1561 | 621f0589 | Kevin Wolf | int64_t sector_num, int nb_sectors)
|
1562 | 621f0589 | Kevin Wolf | { |
1563 | 621f0589 | Kevin Wolf | int ret;
|
1564 | 621f0589 | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
1565 | 621f0589 | Kevin Wolf | |
1566 | 621f0589 | Kevin Wolf | /* Emulate misaligned zero writes */
|
1567 | 621f0589 | Kevin Wolf | if (sector_num % s->cluster_sectors || nb_sectors % s->cluster_sectors) {
|
1568 | 621f0589 | Kevin Wolf | return -ENOTSUP;
|
1569 | 621f0589 | Kevin Wolf | } |
1570 | 621f0589 | Kevin Wolf | |
1571 | 621f0589 | Kevin Wolf | /* Whatever is left can use real zero clusters */
|
1572 | 621f0589 | Kevin Wolf | qemu_co_mutex_lock(&s->lock); |
1573 | 621f0589 | Kevin Wolf | ret = qcow2_zero_clusters(bs, sector_num << BDRV_SECTOR_BITS, |
1574 | 621f0589 | Kevin Wolf | nb_sectors); |
1575 | 621f0589 | Kevin Wolf | qemu_co_mutex_unlock(&s->lock); |
1576 | 621f0589 | Kevin Wolf | |
1577 | 621f0589 | Kevin Wolf | return ret;
|
1578 | 621f0589 | Kevin Wolf | } |
1579 | 621f0589 | Kevin Wolf | |
1580 | 6db39ae2 | Paolo Bonzini | static coroutine_fn int qcow2_co_discard(BlockDriverState *bs, |
1581 | 6db39ae2 | Paolo Bonzini | int64_t sector_num, int nb_sectors)
|
1582 | 5ea929e3 | Kevin Wolf | { |
1583 | 6db39ae2 | Paolo Bonzini | int ret;
|
1584 | 6db39ae2 | Paolo Bonzini | BDRVQcowState *s = bs->opaque; |
1585 | 6db39ae2 | Paolo Bonzini | |
1586 | 6db39ae2 | Paolo Bonzini | qemu_co_mutex_lock(&s->lock); |
1587 | 6db39ae2 | Paolo Bonzini | ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS, |
1588 | 670df5e3 | Kevin Wolf | nb_sectors, QCOW2_DISCARD_REQUEST); |
1589 | 6db39ae2 | Paolo Bonzini | qemu_co_mutex_unlock(&s->lock); |
1590 | 6db39ae2 | Paolo Bonzini | return ret;
|
1591 | 5ea929e3 | Kevin Wolf | } |
1592 | 5ea929e3 | Kevin Wolf | |
1593 | 419b19d9 | Stefan Hajnoczi | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
1594 | 419b19d9 | Stefan Hajnoczi | { |
1595 | 419b19d9 | Stefan Hajnoczi | BDRVQcowState *s = bs->opaque; |
1596 | 2cf7cfa1 | Kevin Wolf | int64_t new_l1_size; |
1597 | 2cf7cfa1 | Kevin Wolf | int ret;
|
1598 | 419b19d9 | Stefan Hajnoczi | |
1599 | 419b19d9 | Stefan Hajnoczi | if (offset & 511) { |
1600 | 259b2173 | Kevin Wolf | error_report("The new size must be a multiple of 512");
|
1601 | 419b19d9 | Stefan Hajnoczi | return -EINVAL;
|
1602 | 419b19d9 | Stefan Hajnoczi | } |
1603 | 419b19d9 | Stefan Hajnoczi | |
1604 | 419b19d9 | Stefan Hajnoczi | /* cannot proceed if image has snapshots */
|
1605 | 419b19d9 | Stefan Hajnoczi | if (s->nb_snapshots) {
|
1606 | 259b2173 | Kevin Wolf | error_report("Can't resize an image which has snapshots");
|
1607 | 419b19d9 | Stefan Hajnoczi | return -ENOTSUP;
|
1608 | 419b19d9 | Stefan Hajnoczi | } |
1609 | 419b19d9 | Stefan Hajnoczi | |
1610 | 419b19d9 | Stefan Hajnoczi | /* shrinking is currently not supported */
|
1611 | 419b19d9 | Stefan Hajnoczi | if (offset < bs->total_sectors * 512) { |
1612 | 259b2173 | Kevin Wolf | error_report("qcow2 doesn't support shrinking images yet");
|
1613 | 419b19d9 | Stefan Hajnoczi | return -ENOTSUP;
|
1614 | 419b19d9 | Stefan Hajnoczi | } |
1615 | 419b19d9 | Stefan Hajnoczi | |
1616 | 419b19d9 | Stefan Hajnoczi | new_l1_size = size_to_l1(s, offset); |
1617 | 72893756 | Stefan Hajnoczi | ret = qcow2_grow_l1_table(bs, new_l1_size, true);
|
1618 | 419b19d9 | Stefan Hajnoczi | if (ret < 0) { |
1619 | 419b19d9 | Stefan Hajnoczi | return ret;
|
1620 | 419b19d9 | Stefan Hajnoczi | } |
1621 | 419b19d9 | Stefan Hajnoczi | |
1622 | 419b19d9 | Stefan Hajnoczi | /* write updated header.size */
|
1623 | 419b19d9 | Stefan Hajnoczi | offset = cpu_to_be64(offset); |
1624 | 8b3b7206 | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
1625 | 8b3b7206 | Kevin Wolf | &offset, sizeof(uint64_t));
|
1626 | 419b19d9 | Stefan Hajnoczi | if (ret < 0) { |
1627 | 419b19d9 | Stefan Hajnoczi | return ret;
|
1628 | 419b19d9 | Stefan Hajnoczi | } |
1629 | 419b19d9 | Stefan Hajnoczi | |
1630 | 419b19d9 | Stefan Hajnoczi | s->l1_vm_state_index = new_l1_size; |
1631 | 419b19d9 | Stefan Hajnoczi | return 0; |
1632 | 419b19d9 | Stefan Hajnoczi | } |
1633 | 419b19d9 | Stefan Hajnoczi | |
1634 | 20d97356 | Blue Swirl | /* XXX: put compressed sectors first, then all the cluster aligned
|
1635 | 20d97356 | Blue Swirl | tables to avoid losing bytes in alignment */
|
1636 | 7c80ab3f | Jes Sorensen | static int qcow2_write_compressed(BlockDriverState *bs, int64_t sector_num, |
1637 | 7c80ab3f | Jes Sorensen | const uint8_t *buf, int nb_sectors) |
1638 | 20d97356 | Blue Swirl | { |
1639 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1640 | 20d97356 | Blue Swirl | z_stream strm; |
1641 | 20d97356 | Blue Swirl | int ret, out_len;
|
1642 | 20d97356 | Blue Swirl | uint8_t *out_buf; |
1643 | 20d97356 | Blue Swirl | uint64_t cluster_offset; |
1644 | 20d97356 | Blue Swirl | |
1645 | 20d97356 | Blue Swirl | if (nb_sectors == 0) { |
1646 | 20d97356 | Blue Swirl | /* align end of file to a sector boundary to ease reading with
|
1647 | 20d97356 | Blue Swirl | sector based I/Os */
|
1648 | 66f82cee | Kevin Wolf | cluster_offset = bdrv_getlength(bs->file); |
1649 | 20d97356 | Blue Swirl | cluster_offset = (cluster_offset + 511) & ~511; |
1650 | 66f82cee | Kevin Wolf | bdrv_truncate(bs->file, cluster_offset); |
1651 | 20d97356 | Blue Swirl | return 0; |
1652 | 20d97356 | Blue Swirl | } |
1653 | 20d97356 | Blue Swirl | |
1654 | f4d38bef | Stefan Hajnoczi | if (nb_sectors != s->cluster_sectors) {
|
1655 | f4d38bef | Stefan Hajnoczi | ret = -EINVAL; |
1656 | f4d38bef | Stefan Hajnoczi | |
1657 | f4d38bef | Stefan Hajnoczi | /* Zero-pad last write if image size is not cluster aligned */
|
1658 | f4d38bef | Stefan Hajnoczi | if (sector_num + nb_sectors == bs->total_sectors &&
|
1659 | f4d38bef | Stefan Hajnoczi | nb_sectors < s->cluster_sectors) { |
1660 | f4d38bef | Stefan Hajnoczi | uint8_t *pad_buf = qemu_blockalign(bs, s->cluster_size); |
1661 | f4d38bef | Stefan Hajnoczi | memset(pad_buf, 0, s->cluster_size);
|
1662 | f4d38bef | Stefan Hajnoczi | memcpy(pad_buf, buf, nb_sectors * BDRV_SECTOR_SIZE); |
1663 | f4d38bef | Stefan Hajnoczi | ret = qcow2_write_compressed(bs, sector_num, |
1664 | f4d38bef | Stefan Hajnoczi | pad_buf, s->cluster_sectors); |
1665 | f4d38bef | Stefan Hajnoczi | qemu_vfree(pad_buf); |
1666 | f4d38bef | Stefan Hajnoczi | } |
1667 | f4d38bef | Stefan Hajnoczi | return ret;
|
1668 | f4d38bef | Stefan Hajnoczi | } |
1669 | 20d97356 | Blue Swirl | |
1670 | 7267c094 | Anthony Liguori | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
1671 | 20d97356 | Blue Swirl | |
1672 | 20d97356 | Blue Swirl | /* best compression, small window, no zlib header */
|
1673 | 20d97356 | Blue Swirl | memset(&strm, 0, sizeof(strm)); |
1674 | 20d97356 | Blue Swirl | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
1675 | 20d97356 | Blue Swirl | Z_DEFLATED, -12,
|
1676 | 20d97356 | Blue Swirl | 9, Z_DEFAULT_STRATEGY);
|
1677 | 20d97356 | Blue Swirl | if (ret != 0) { |
1678 | 8f1efd00 | Kevin Wolf | ret = -EINVAL; |
1679 | 8f1efd00 | Kevin Wolf | goto fail;
|
1680 | 20d97356 | Blue Swirl | } |
1681 | 20d97356 | Blue Swirl | |
1682 | 20d97356 | Blue Swirl | strm.avail_in = s->cluster_size; |
1683 | 20d97356 | Blue Swirl | strm.next_in = (uint8_t *)buf; |
1684 | 20d97356 | Blue Swirl | strm.avail_out = s->cluster_size; |
1685 | 20d97356 | Blue Swirl | strm.next_out = out_buf; |
1686 | 20d97356 | Blue Swirl | |
1687 | 20d97356 | Blue Swirl | ret = deflate(&strm, Z_FINISH); |
1688 | 20d97356 | Blue Swirl | if (ret != Z_STREAM_END && ret != Z_OK) {
|
1689 | 20d97356 | Blue Swirl | deflateEnd(&strm); |
1690 | 8f1efd00 | Kevin Wolf | ret = -EINVAL; |
1691 | 8f1efd00 | Kevin Wolf | goto fail;
|
1692 | 20d97356 | Blue Swirl | } |
1693 | 20d97356 | Blue Swirl | out_len = strm.next_out - out_buf; |
1694 | 20d97356 | Blue Swirl | |
1695 | 20d97356 | Blue Swirl | deflateEnd(&strm); |
1696 | 20d97356 | Blue Swirl | |
1697 | 20d97356 | Blue Swirl | if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
|
1698 | 20d97356 | Blue Swirl | /* could not compress: write normal cluster */
|
1699 | cf93980e | Max Reitz | |
1700 | cf93980e | Max Reitz | ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, |
1701 | cf93980e | Max Reitz | sector_num * BDRV_SECTOR_SIZE, |
1702 | cf93980e | Max Reitz | s->cluster_sectors * BDRV_SECTOR_SIZE); |
1703 | cf93980e | Max Reitz | if (ret < 0) { |
1704 | cf93980e | Max Reitz | goto fail;
|
1705 | cf93980e | Max Reitz | } |
1706 | cf93980e | Max Reitz | |
1707 | 8f1efd00 | Kevin Wolf | ret = bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
1708 | 8f1efd00 | Kevin Wolf | if (ret < 0) { |
1709 | 8f1efd00 | Kevin Wolf | goto fail;
|
1710 | 8f1efd00 | Kevin Wolf | } |
1711 | 20d97356 | Blue Swirl | } else {
|
1712 | 20d97356 | Blue Swirl | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, |
1713 | 20d97356 | Blue Swirl | sector_num << 9, out_len);
|
1714 | 8f1efd00 | Kevin Wolf | if (!cluster_offset) {
|
1715 | 8f1efd00 | Kevin Wolf | ret = -EIO; |
1716 | 8f1efd00 | Kevin Wolf | goto fail;
|
1717 | 8f1efd00 | Kevin Wolf | } |
1718 | 20d97356 | Blue Swirl | cluster_offset &= s->cluster_offset_mask; |
1719 | cf93980e | Max Reitz | |
1720 | cf93980e | Max Reitz | ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, |
1721 | cf93980e | Max Reitz | cluster_offset, out_len); |
1722 | cf93980e | Max Reitz | if (ret < 0) { |
1723 | cf93980e | Max Reitz | goto fail;
|
1724 | cf93980e | Max Reitz | } |
1725 | cf93980e | Max Reitz | |
1726 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
1727 | 8f1efd00 | Kevin Wolf | ret = bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len); |
1728 | 8f1efd00 | Kevin Wolf | if (ret < 0) { |
1729 | 8f1efd00 | Kevin Wolf | goto fail;
|
1730 | 20d97356 | Blue Swirl | } |
1731 | 20d97356 | Blue Swirl | } |
1732 | 20d97356 | Blue Swirl | |
1733 | 8f1efd00 | Kevin Wolf | ret = 0;
|
1734 | 8f1efd00 | Kevin Wolf | fail:
|
1735 | 7267c094 | Anthony Liguori | g_free(out_buf); |
1736 | 8f1efd00 | Kevin Wolf | return ret;
|
1737 | 20d97356 | Blue Swirl | } |
1738 | 20d97356 | Blue Swirl | |
1739 | a968168c | Dong Xu Wang | static coroutine_fn int qcow2_co_flush_to_os(BlockDriverState *bs) |
1740 | 20d97356 | Blue Swirl | { |
1741 | 29c1a730 | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
1742 | 29c1a730 | Kevin Wolf | int ret;
|
1743 | 29c1a730 | Kevin Wolf | |
1744 | 8b94ff85 | Paolo Bonzini | qemu_co_mutex_lock(&s->lock); |
1745 | 29c1a730 | Kevin Wolf | ret = qcow2_cache_flush(bs, s->l2_table_cache); |
1746 | 29c1a730 | Kevin Wolf | if (ret < 0) { |
1747 | c95de7e2 | Dong Xu Wang | qemu_co_mutex_unlock(&s->lock); |
1748 | 8b94ff85 | Paolo Bonzini | return ret;
|
1749 | 29c1a730 | Kevin Wolf | } |
1750 | 29c1a730 | Kevin Wolf | |
1751 | bfe8043e | Stefan Hajnoczi | if (qcow2_need_accurate_refcounts(s)) {
|
1752 | bfe8043e | Stefan Hajnoczi | ret = qcow2_cache_flush(bs, s->refcount_block_cache); |
1753 | bfe8043e | Stefan Hajnoczi | if (ret < 0) { |
1754 | bfe8043e | Stefan Hajnoczi | qemu_co_mutex_unlock(&s->lock); |
1755 | bfe8043e | Stefan Hajnoczi | return ret;
|
1756 | bfe8043e | Stefan Hajnoczi | } |
1757 | 29c1a730 | Kevin Wolf | } |
1758 | 8b94ff85 | Paolo Bonzini | qemu_co_mutex_unlock(&s->lock); |
1759 | 29c1a730 | Kevin Wolf | |
1760 | eb489bb1 | Kevin Wolf | return 0; |
1761 | eb489bb1 | Kevin Wolf | } |
1762 | eb489bb1 | Kevin Wolf | |
1763 | 7c80ab3f | Jes Sorensen | static int qcow2_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1764 | 20d97356 | Blue Swirl | { |
1765 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1766 | 20d97356 | Blue Swirl | bdi->cluster_size = s->cluster_size; |
1767 | 7c80ab3f | Jes Sorensen | bdi->vm_state_offset = qcow2_vm_state_offset(s); |
1768 | 20d97356 | Blue Swirl | return 0; |
1769 | 20d97356 | Blue Swirl | } |
1770 | 20d97356 | Blue Swirl | |
1771 | 20d97356 | Blue Swirl | #if 0
|
1772 | 20d97356 | Blue Swirl | static void dump_refcounts(BlockDriverState *bs)
|
1773 | 20d97356 | Blue Swirl | {
|
1774 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque;
|
1775 | 20d97356 | Blue Swirl | int64_t nb_clusters, k, k1, size;
|
1776 | 20d97356 | Blue Swirl | int refcount;
|
1777 | 20d97356 | Blue Swirl | |
1778 | 66f82cee | Kevin Wolf | size = bdrv_getlength(bs->file);
|
1779 | 20d97356 | Blue Swirl | nb_clusters = size_to_clusters(s, size);
|
1780 | 20d97356 | Blue Swirl | for(k = 0; k < nb_clusters;) {
|
1781 | 20d97356 | Blue Swirl | k1 = k;
|
1782 | 20d97356 | Blue Swirl | refcount = get_refcount(bs, k);
|
1783 | 20d97356 | Blue Swirl | k++;
|
1784 | 20d97356 | Blue Swirl | while (k < nb_clusters && get_refcount(bs, k) == refcount)
|
1785 | 20d97356 | Blue Swirl | k++;
|
1786 | 0bfcd599 | Blue Swirl | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount,
|
1787 | 0bfcd599 | Blue Swirl | k - k1);
|
1788 | 20d97356 | Blue Swirl | }
|
1789 | 20d97356 | Blue Swirl | }
|
1790 | 20d97356 | Blue Swirl | #endif
|
1791 | 20d97356 | Blue Swirl | |
1792 | cf8074b3 | Kevin Wolf | static int qcow2_save_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, |
1793 | cf8074b3 | Kevin Wolf | int64_t pos) |
1794 | 20d97356 | Blue Swirl | { |
1795 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1796 | 20d97356 | Blue Swirl | int growable = bs->growable;
|
1797 | 20d97356 | Blue Swirl | int ret;
|
1798 | 20d97356 | Blue Swirl | |
1799 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
1800 | 20d97356 | Blue Swirl | bs->growable = 1;
|
1801 | 8d3b1a2d | Kevin Wolf | ret = bdrv_pwritev(bs, qcow2_vm_state_offset(s) + pos, qiov); |
1802 | 20d97356 | Blue Swirl | bs->growable = growable; |
1803 | 20d97356 | Blue Swirl | |
1804 | 20d97356 | Blue Swirl | return ret;
|
1805 | 20d97356 | Blue Swirl | } |
1806 | 20d97356 | Blue Swirl | |
1807 | 7c80ab3f | Jes Sorensen | static int qcow2_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1808 | 7c80ab3f | Jes Sorensen | int64_t pos, int size)
|
1809 | 20d97356 | Blue Swirl | { |
1810 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1811 | 20d97356 | Blue Swirl | int growable = bs->growable;
|
1812 | 0d51b4de | Asias He | bool zero_beyond_eof = bs->zero_beyond_eof;
|
1813 | 20d97356 | Blue Swirl | int ret;
|
1814 | 20d97356 | Blue Swirl | |
1815 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
1816 | 20d97356 | Blue Swirl | bs->growable = 1;
|
1817 | 0d51b4de | Asias He | bs->zero_beyond_eof = false;
|
1818 | 7c80ab3f | Jes Sorensen | ret = bdrv_pread(bs, qcow2_vm_state_offset(s) + pos, buf, size); |
1819 | 20d97356 | Blue Swirl | bs->growable = growable; |
1820 | 0d51b4de | Asias He | bs->zero_beyond_eof = zero_beyond_eof; |
1821 | 20d97356 | Blue Swirl | |
1822 | 20d97356 | Blue Swirl | return ret;
|
1823 | 20d97356 | Blue Swirl | } |
1824 | 20d97356 | Blue Swirl | |
1825 | 9296b3ed | Max Reitz | /*
|
1826 | 9296b3ed | Max Reitz | * Downgrades an image's version. To achieve this, any incompatible features
|
1827 | 9296b3ed | Max Reitz | * have to be removed.
|
1828 | 9296b3ed | Max Reitz | */
|
1829 | 9296b3ed | Max Reitz | static int qcow2_downgrade(BlockDriverState *bs, int target_version) |
1830 | 9296b3ed | Max Reitz | { |
1831 | 9296b3ed | Max Reitz | BDRVQcowState *s = bs->opaque; |
1832 | 9296b3ed | Max Reitz | int current_version = s->qcow_version;
|
1833 | 9296b3ed | Max Reitz | int ret;
|
1834 | 9296b3ed | Max Reitz | |
1835 | 9296b3ed | Max Reitz | if (target_version == current_version) {
|
1836 | 9296b3ed | Max Reitz | return 0; |
1837 | 9296b3ed | Max Reitz | } else if (target_version > current_version) { |
1838 | 9296b3ed | Max Reitz | return -EINVAL;
|
1839 | 9296b3ed | Max Reitz | } else if (target_version != 2) { |
1840 | 9296b3ed | Max Reitz | return -EINVAL;
|
1841 | 9296b3ed | Max Reitz | } |
1842 | 9296b3ed | Max Reitz | |
1843 | 9296b3ed | Max Reitz | if (s->refcount_order != 4) { |
1844 | 9296b3ed | Max Reitz | /* we would have to convert the image to a refcount_order == 4 image
|
1845 | 9296b3ed | Max Reitz | * here; however, since qemu (at the time of writing this) does not
|
1846 | 9296b3ed | Max Reitz | * support anything different than 4 anyway, there is no point in doing
|
1847 | 9296b3ed | Max Reitz | * so right now; however, we should error out (if qemu supports this in
|
1848 | 9296b3ed | Max Reitz | * the future and this code has not been adapted) */
|
1849 | 9296b3ed | Max Reitz | error_report("qcow2_downgrade: Image refcount orders other than 4 are"
|
1850 | 9296b3ed | Max Reitz | "currently not supported.");
|
1851 | 9296b3ed | Max Reitz | return -ENOTSUP;
|
1852 | 9296b3ed | Max Reitz | } |
1853 | 9296b3ed | Max Reitz | |
1854 | 9296b3ed | Max Reitz | /* clear incompatible features */
|
1855 | 9296b3ed | Max Reitz | if (s->incompatible_features & QCOW2_INCOMPAT_DIRTY) {
|
1856 | 9296b3ed | Max Reitz | ret = qcow2_mark_clean(bs); |
1857 | 9296b3ed | Max Reitz | if (ret < 0) { |
1858 | 9296b3ed | Max Reitz | return ret;
|
1859 | 9296b3ed | Max Reitz | } |
1860 | 9296b3ed | Max Reitz | } |
1861 | 9296b3ed | Max Reitz | |
1862 | 9296b3ed | Max Reitz | /* with QCOW2_INCOMPAT_CORRUPT, it is pretty much impossible to get here in
|
1863 | 9296b3ed | Max Reitz | * the first place; if that happens nonetheless, returning -ENOTSUP is the
|
1864 | 9296b3ed | Max Reitz | * best thing to do anyway */
|
1865 | 9296b3ed | Max Reitz | |
1866 | 9296b3ed | Max Reitz | if (s->incompatible_features) {
|
1867 | 9296b3ed | Max Reitz | return -ENOTSUP;
|
1868 | 9296b3ed | Max Reitz | } |
1869 | 9296b3ed | Max Reitz | |
1870 | 9296b3ed | Max Reitz | /* since we can ignore compatible features, we can set them to 0 as well */
|
1871 | 9296b3ed | Max Reitz | s->compatible_features = 0;
|
1872 | 9296b3ed | Max Reitz | /* if lazy refcounts have been used, they have already been fixed through
|
1873 | 9296b3ed | Max Reitz | * clearing the dirty flag */
|
1874 | 9296b3ed | Max Reitz | |
1875 | 9296b3ed | Max Reitz | /* clearing autoclear features is trivial */
|
1876 | 9296b3ed | Max Reitz | s->autoclear_features = 0;
|
1877 | 9296b3ed | Max Reitz | |
1878 | 9296b3ed | Max Reitz | ret = qcow2_expand_zero_clusters(bs); |
1879 | 9296b3ed | Max Reitz | if (ret < 0) { |
1880 | 9296b3ed | Max Reitz | return ret;
|
1881 | 9296b3ed | Max Reitz | } |
1882 | 9296b3ed | Max Reitz | |
1883 | 9296b3ed | Max Reitz | s->qcow_version = target_version; |
1884 | 9296b3ed | Max Reitz | ret = qcow2_update_header(bs); |
1885 | 9296b3ed | Max Reitz | if (ret < 0) { |
1886 | 9296b3ed | Max Reitz | s->qcow_version = current_version; |
1887 | 9296b3ed | Max Reitz | return ret;
|
1888 | 9296b3ed | Max Reitz | } |
1889 | 9296b3ed | Max Reitz | return 0; |
1890 | 9296b3ed | Max Reitz | } |
1891 | 9296b3ed | Max Reitz | |
1892 | 9296b3ed | Max Reitz | static int qcow2_amend_options(BlockDriverState *bs, |
1893 | 9296b3ed | Max Reitz | QEMUOptionParameter *options) |
1894 | 9296b3ed | Max Reitz | { |
1895 | 9296b3ed | Max Reitz | BDRVQcowState *s = bs->opaque; |
1896 | 9296b3ed | Max Reitz | int old_version = s->qcow_version, new_version = old_version;
|
1897 | 9296b3ed | Max Reitz | uint64_t new_size = 0;
|
1898 | 9296b3ed | Max Reitz | const char *backing_file = NULL, *backing_format = NULL; |
1899 | 9296b3ed | Max Reitz | bool lazy_refcounts = s->use_lazy_refcounts;
|
1900 | 9296b3ed | Max Reitz | int ret;
|
1901 | 9296b3ed | Max Reitz | int i;
|
1902 | 9296b3ed | Max Reitz | |
1903 | 9296b3ed | Max Reitz | for (i = 0; options[i].name; i++) |
1904 | 9296b3ed | Max Reitz | { |
1905 | 9296b3ed | Max Reitz | if (!options[i].assigned) {
|
1906 | 9296b3ed | Max Reitz | /* only change explicitly defined options */
|
1907 | 9296b3ed | Max Reitz | continue;
|
1908 | 9296b3ed | Max Reitz | } |
1909 | 9296b3ed | Max Reitz | |
1910 | 9296b3ed | Max Reitz | if (!strcmp(options[i].name, "compat")) { |
1911 | 9296b3ed | Max Reitz | if (!options[i].value.s) {
|
1912 | 9296b3ed | Max Reitz | /* preserve default */
|
1913 | 9296b3ed | Max Reitz | } else if (!strcmp(options[i].value.s, "0.10")) { |
1914 | 9296b3ed | Max Reitz | new_version = 2;
|
1915 | 9296b3ed | Max Reitz | } else if (!strcmp(options[i].value.s, "1.1")) { |
1916 | 9296b3ed | Max Reitz | new_version = 3;
|
1917 | 9296b3ed | Max Reitz | } else {
|
1918 | 9296b3ed | Max Reitz | fprintf(stderr, "Unknown compatibility level %s.\n",
|
1919 | 9296b3ed | Max Reitz | options[i].value.s); |
1920 | 9296b3ed | Max Reitz | return -EINVAL;
|
1921 | 9296b3ed | Max Reitz | } |
1922 | 9296b3ed | Max Reitz | } else if (!strcmp(options[i].name, "preallocation")) { |
1923 | 9296b3ed | Max Reitz | fprintf(stderr, "Cannot change preallocation mode.\n");
|
1924 | 9296b3ed | Max Reitz | return -ENOTSUP;
|
1925 | 9296b3ed | Max Reitz | } else if (!strcmp(options[i].name, "size")) { |
1926 | 9296b3ed | Max Reitz | new_size = options[i].value.n; |
1927 | 9296b3ed | Max Reitz | } else if (!strcmp(options[i].name, "backing_file")) { |
1928 | 9296b3ed | Max Reitz | backing_file = options[i].value.s; |
1929 | 9296b3ed | Max Reitz | } else if (!strcmp(options[i].name, "backing_fmt")) { |
1930 | 9296b3ed | Max Reitz | backing_format = options[i].value.s; |
1931 | 9296b3ed | Max Reitz | } else if (!strcmp(options[i].name, "encryption")) { |
1932 | 9296b3ed | Max Reitz | if ((options[i].value.n != !!s->crypt_method)) {
|
1933 | 9296b3ed | Max Reitz | fprintf(stderr, "Changing the encryption flag is not "
|
1934 | 9296b3ed | Max Reitz | "supported.\n");
|
1935 | 9296b3ed | Max Reitz | return -ENOTSUP;
|
1936 | 9296b3ed | Max Reitz | } |
1937 | 9296b3ed | Max Reitz | } else if (!strcmp(options[i].name, "cluster_size")) { |
1938 | 9296b3ed | Max Reitz | if (options[i].value.n != s->cluster_size) {
|
1939 | 9296b3ed | Max Reitz | fprintf(stderr, "Changing the cluster size is not "
|
1940 | 9296b3ed | Max Reitz | "supported.\n");
|
1941 | 9296b3ed | Max Reitz | return -ENOTSUP;
|
1942 | 9296b3ed | Max Reitz | } |
1943 | 9296b3ed | Max Reitz | } else if (!strcmp(options[i].name, "lazy_refcounts")) { |
1944 | 9296b3ed | Max Reitz | lazy_refcounts = options[i].value.n; |
1945 | 9296b3ed | Max Reitz | } else {
|
1946 | 9296b3ed | Max Reitz | /* if this assertion fails, this probably means a new option was
|
1947 | 9296b3ed | Max Reitz | * added without having it covered here */
|
1948 | 9296b3ed | Max Reitz | assert(false);
|
1949 | 9296b3ed | Max Reitz | } |
1950 | 9296b3ed | Max Reitz | } |
1951 | 9296b3ed | Max Reitz | |
1952 | 9296b3ed | Max Reitz | if (new_version != old_version) {
|
1953 | 9296b3ed | Max Reitz | if (new_version > old_version) {
|
1954 | 9296b3ed | Max Reitz | /* Upgrade */
|
1955 | 9296b3ed | Max Reitz | s->qcow_version = new_version; |
1956 | 9296b3ed | Max Reitz | ret = qcow2_update_header(bs); |
1957 | 9296b3ed | Max Reitz | if (ret < 0) { |
1958 | 9296b3ed | Max Reitz | s->qcow_version = old_version; |
1959 | 9296b3ed | Max Reitz | return ret;
|
1960 | 9296b3ed | Max Reitz | } |
1961 | 9296b3ed | Max Reitz | } else {
|
1962 | 9296b3ed | Max Reitz | ret = qcow2_downgrade(bs, new_version); |
1963 | 9296b3ed | Max Reitz | if (ret < 0) { |
1964 | 9296b3ed | Max Reitz | return ret;
|
1965 | 9296b3ed | Max Reitz | } |
1966 | 9296b3ed | Max Reitz | } |
1967 | 9296b3ed | Max Reitz | } |
1968 | 9296b3ed | Max Reitz | |
1969 | 9296b3ed | Max Reitz | if (backing_file || backing_format) {
|
1970 | 9296b3ed | Max Reitz | ret = qcow2_change_backing_file(bs, backing_file ?: bs->backing_file, |
1971 | 9296b3ed | Max Reitz | backing_format ?: bs->backing_format); |
1972 | 9296b3ed | Max Reitz | if (ret < 0) { |
1973 | 9296b3ed | Max Reitz | return ret;
|
1974 | 9296b3ed | Max Reitz | } |
1975 | 9296b3ed | Max Reitz | } |
1976 | 9296b3ed | Max Reitz | |
1977 | 9296b3ed | Max Reitz | if (s->use_lazy_refcounts != lazy_refcounts) {
|
1978 | 9296b3ed | Max Reitz | if (lazy_refcounts) {
|
1979 | 9296b3ed | Max Reitz | if (s->qcow_version < 3) { |
1980 | 9296b3ed | Max Reitz | fprintf(stderr, "Lazy refcounts only supported with compatibility "
|
1981 | 9296b3ed | Max Reitz | "level 1.1 and above (use compat=1.1 or greater)\n");
|
1982 | 9296b3ed | Max Reitz | return -EINVAL;
|
1983 | 9296b3ed | Max Reitz | } |
1984 | 9296b3ed | Max Reitz | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; |
1985 | 9296b3ed | Max Reitz | ret = qcow2_update_header(bs); |
1986 | 9296b3ed | Max Reitz | if (ret < 0) { |
1987 | 9296b3ed | Max Reitz | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; |
1988 | 9296b3ed | Max Reitz | return ret;
|
1989 | 9296b3ed | Max Reitz | } |
1990 | 9296b3ed | Max Reitz | s->use_lazy_refcounts = true;
|
1991 | 9296b3ed | Max Reitz | } else {
|
1992 | 9296b3ed | Max Reitz | /* make image clean first */
|
1993 | 9296b3ed | Max Reitz | ret = qcow2_mark_clean(bs); |
1994 | 9296b3ed | Max Reitz | if (ret < 0) { |
1995 | 9296b3ed | Max Reitz | return ret;
|
1996 | 9296b3ed | Max Reitz | } |
1997 | 9296b3ed | Max Reitz | /* now disallow lazy refcounts */
|
1998 | 9296b3ed | Max Reitz | s->compatible_features &= ~QCOW2_COMPAT_LAZY_REFCOUNTS; |
1999 | 9296b3ed | Max Reitz | ret = qcow2_update_header(bs); |
2000 | 9296b3ed | Max Reitz | if (ret < 0) { |
2001 | 9296b3ed | Max Reitz | s->compatible_features |= QCOW2_COMPAT_LAZY_REFCOUNTS; |
2002 | 9296b3ed | Max Reitz | return ret;
|
2003 | 9296b3ed | Max Reitz | } |
2004 | 9296b3ed | Max Reitz | s->use_lazy_refcounts = false;
|
2005 | 9296b3ed | Max Reitz | } |
2006 | 9296b3ed | Max Reitz | } |
2007 | 9296b3ed | Max Reitz | |
2008 | 9296b3ed | Max Reitz | if (new_size) {
|
2009 | 9296b3ed | Max Reitz | ret = bdrv_truncate(bs, new_size); |
2010 | 9296b3ed | Max Reitz | if (ret < 0) { |
2011 | 9296b3ed | Max Reitz | return ret;
|
2012 | 9296b3ed | Max Reitz | } |
2013 | 9296b3ed | Max Reitz | } |
2014 | 9296b3ed | Max Reitz | |
2015 | 9296b3ed | Max Reitz | return 0; |
2016 | 9296b3ed | Max Reitz | } |
2017 | 9296b3ed | Max Reitz | |
2018 | 7c80ab3f | Jes Sorensen | static QEMUOptionParameter qcow2_create_options[] = {
|
2019 | 20d97356 | Blue Swirl | { |
2020 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_SIZE, |
2021 | 20d97356 | Blue Swirl | .type = OPT_SIZE, |
2022 | 20d97356 | Blue Swirl | .help = "Virtual disk size"
|
2023 | 20d97356 | Blue Swirl | }, |
2024 | 20d97356 | Blue Swirl | { |
2025 | 6744cbab | Kevin Wolf | .name = BLOCK_OPT_COMPAT_LEVEL, |
2026 | 6744cbab | Kevin Wolf | .type = OPT_STRING, |
2027 | 6744cbab | Kevin Wolf | .help = "Compatibility level (0.10 or 1.1)"
|
2028 | 6744cbab | Kevin Wolf | }, |
2029 | 6744cbab | Kevin Wolf | { |
2030 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_BACKING_FILE, |
2031 | 20d97356 | Blue Swirl | .type = OPT_STRING, |
2032 | 20d97356 | Blue Swirl | .help = "File name of a base image"
|
2033 | 20d97356 | Blue Swirl | }, |
2034 | 20d97356 | Blue Swirl | { |
2035 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_BACKING_FMT, |
2036 | 20d97356 | Blue Swirl | .type = OPT_STRING, |
2037 | 20d97356 | Blue Swirl | .help = "Image format of the base image"
|
2038 | 20d97356 | Blue Swirl | }, |
2039 | 20d97356 | Blue Swirl | { |
2040 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_ENCRYPT, |
2041 | 20d97356 | Blue Swirl | .type = OPT_FLAG, |
2042 | 20d97356 | Blue Swirl | .help = "Encrypt the image"
|
2043 | 20d97356 | Blue Swirl | }, |
2044 | 20d97356 | Blue Swirl | { |
2045 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_CLUSTER_SIZE, |
2046 | 20d97356 | Blue Swirl | .type = OPT_SIZE, |
2047 | 99cce9fa | Kevin Wolf | .help = "qcow2 cluster size",
|
2048 | 99cce9fa | Kevin Wolf | .value = { .n = DEFAULT_CLUSTER_SIZE }, |
2049 | 20d97356 | Blue Swirl | }, |
2050 | 20d97356 | Blue Swirl | { |
2051 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_PREALLOC, |
2052 | 20d97356 | Blue Swirl | .type = OPT_STRING, |
2053 | 20d97356 | Blue Swirl | .help = "Preallocation mode (allowed values: off, metadata)"
|
2054 | 20d97356 | Blue Swirl | }, |
2055 | bfe8043e | Stefan Hajnoczi | { |
2056 | bfe8043e | Stefan Hajnoczi | .name = BLOCK_OPT_LAZY_REFCOUNTS, |
2057 | bfe8043e | Stefan Hajnoczi | .type = OPT_FLAG, |
2058 | bfe8043e | Stefan Hajnoczi | .help = "Postpone refcount updates",
|
2059 | bfe8043e | Stefan Hajnoczi | }, |
2060 | 20d97356 | Blue Swirl | { NULL }
|
2061 | 20d97356 | Blue Swirl | }; |
2062 | 20d97356 | Blue Swirl | |
2063 | 20d97356 | Blue Swirl | static BlockDriver bdrv_qcow2 = {
|
2064 | 7c80ab3f | Jes Sorensen | .format_name = "qcow2",
|
2065 | 7c80ab3f | Jes Sorensen | .instance_size = sizeof(BDRVQcowState),
|
2066 | 7c80ab3f | Jes Sorensen | .bdrv_probe = qcow2_probe, |
2067 | 7c80ab3f | Jes Sorensen | .bdrv_open = qcow2_open, |
2068 | 7c80ab3f | Jes Sorensen | .bdrv_close = qcow2_close, |
2069 | 21d82ac9 | Jeff Cody | .bdrv_reopen_prepare = qcow2_reopen_prepare, |
2070 | 7c80ab3f | Jes Sorensen | .bdrv_create = qcow2_create, |
2071 | 3ac21627 | Peter Lieven | .bdrv_has_zero_init = bdrv_has_zero_init_1, |
2072 | b6b8a333 | Paolo Bonzini | .bdrv_co_get_block_status = qcow2_co_get_block_status, |
2073 | 7c80ab3f | Jes Sorensen | .bdrv_set_key = qcow2_set_key, |
2074 | 7c80ab3f | Jes Sorensen | .bdrv_make_empty = qcow2_make_empty, |
2075 | 7c80ab3f | Jes Sorensen | |
2076 | c68b89ac | Kevin Wolf | .bdrv_co_readv = qcow2_co_readv, |
2077 | c68b89ac | Kevin Wolf | .bdrv_co_writev = qcow2_co_writev, |
2078 | eb489bb1 | Kevin Wolf | .bdrv_co_flush_to_os = qcow2_co_flush_to_os, |
2079 | 419b19d9 | Stefan Hajnoczi | |
2080 | 621f0589 | Kevin Wolf | .bdrv_co_write_zeroes = qcow2_co_write_zeroes, |
2081 | 6db39ae2 | Paolo Bonzini | .bdrv_co_discard = qcow2_co_discard, |
2082 | 419b19d9 | Stefan Hajnoczi | .bdrv_truncate = qcow2_truncate, |
2083 | 7c80ab3f | Jes Sorensen | .bdrv_write_compressed = qcow2_write_compressed, |
2084 | 20d97356 | Blue Swirl | |
2085 | 20d97356 | Blue Swirl | .bdrv_snapshot_create = qcow2_snapshot_create, |
2086 | 20d97356 | Blue Swirl | .bdrv_snapshot_goto = qcow2_snapshot_goto, |
2087 | 20d97356 | Blue Swirl | .bdrv_snapshot_delete = qcow2_snapshot_delete, |
2088 | 20d97356 | Blue Swirl | .bdrv_snapshot_list = qcow2_snapshot_list, |
2089 | 51ef6727 | edison | .bdrv_snapshot_load_tmp = qcow2_snapshot_load_tmp, |
2090 | 7c80ab3f | Jes Sorensen | .bdrv_get_info = qcow2_get_info, |
2091 | 20d97356 | Blue Swirl | |
2092 | 7c80ab3f | Jes Sorensen | .bdrv_save_vmstate = qcow2_save_vmstate, |
2093 | 7c80ab3f | Jes Sorensen | .bdrv_load_vmstate = qcow2_load_vmstate, |
2094 | 20d97356 | Blue Swirl | |
2095 | 20d97356 | Blue Swirl | .bdrv_change_backing_file = qcow2_change_backing_file, |
2096 | 20d97356 | Blue Swirl | |
2097 | 06d9260f | Anthony Liguori | .bdrv_invalidate_cache = qcow2_invalidate_cache, |
2098 | 06d9260f | Anthony Liguori | |
2099 | 7c80ab3f | Jes Sorensen | .create_options = qcow2_create_options, |
2100 | 7c80ab3f | Jes Sorensen | .bdrv_check = qcow2_check, |
2101 | 9296b3ed | Max Reitz | .bdrv_amend_options = qcow2_amend_options, |
2102 | 20d97356 | Blue Swirl | }; |
2103 | 20d97356 | Blue Swirl | |
2104 | 5efa9d5a | Anthony Liguori | static void bdrv_qcow2_init(void) |
2105 | 5efa9d5a | Anthony Liguori | { |
2106 | 5efa9d5a | Anthony Liguori | bdrv_register(&bdrv_qcow2); |
2107 | 5efa9d5a | Anthony Liguori | } |
2108 | 5efa9d5a | Anthony Liguori | |
2109 | 5efa9d5a | Anthony Liguori | block_init(bdrv_qcow2_init); |