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/*
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* QEMU Enhanced Disk Format
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qed.h"
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static int bdrv_qed_probe(const uint8_t *buf, int buf_size,
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const char *filename)
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19 |
{
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20 |
const QEDHeader *header = (const QEDHeader *)buf;
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if (buf_size < sizeof(*header)) {
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23 |
return 0;
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24 |
}
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if (le32_to_cpu(header->magic) != QED_MAGIC) {
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return 0;
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}
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return 100;
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}
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/**
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32 |
* Check whether an image format is raw
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*
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34 |
* @fmt: Backing file format, may be NULL
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*/
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static bool qed_fmt_is_raw(const char *fmt)
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{
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38 |
return fmt && strcmp(fmt, "raw") == 0;
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}
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static void qed_header_le_to_cpu(const QEDHeader *le, QEDHeader *cpu)
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{
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43 |
cpu->magic = le32_to_cpu(le->magic);
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44 |
cpu->cluster_size = le32_to_cpu(le->cluster_size);
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cpu->table_size = le32_to_cpu(le->table_size);
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cpu->header_size = le32_to_cpu(le->header_size);
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cpu->features = le64_to_cpu(le->features);
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cpu->compat_features = le64_to_cpu(le->compat_features);
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cpu->autoclear_features = le64_to_cpu(le->autoclear_features);
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cpu->l1_table_offset = le64_to_cpu(le->l1_table_offset);
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cpu->image_size = le64_to_cpu(le->image_size);
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cpu->backing_filename_offset = le32_to_cpu(le->backing_filename_offset);
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cpu->backing_filename_size = le32_to_cpu(le->backing_filename_size);
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}
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static void qed_header_cpu_to_le(const QEDHeader *cpu, QEDHeader *le)
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{
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le->magic = cpu_to_le32(cpu->magic);
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le->cluster_size = cpu_to_le32(cpu->cluster_size);
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le->table_size = cpu_to_le32(cpu->table_size);
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le->header_size = cpu_to_le32(cpu->header_size);
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le->features = cpu_to_le64(cpu->features);
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le->compat_features = cpu_to_le64(cpu->compat_features);
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le->autoclear_features = cpu_to_le64(cpu->autoclear_features);
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le->l1_table_offset = cpu_to_le64(cpu->l1_table_offset);
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le->image_size = cpu_to_le64(cpu->image_size);
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le->backing_filename_offset = cpu_to_le32(cpu->backing_filename_offset);
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le->backing_filename_size = cpu_to_le32(cpu->backing_filename_size);
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}
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71 |
static int qed_write_header_sync(BDRVQEDState *s)
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{
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QEDHeader le;
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74 |
int ret;
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75 |
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qed_header_cpu_to_le(&s->header, &le);
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ret = bdrv_pwrite(s->bs->file, 0, &le, sizeof(le));
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if (ret != sizeof(le)) {
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return ret;
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}
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return 0;
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}
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static uint64_t qed_max_image_size(uint32_t cluster_size, uint32_t table_size)
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{
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uint64_t table_entries;
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uint64_t l2_size;
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table_entries = (table_size * cluster_size) / sizeof(uint64_t);
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l2_size = table_entries * cluster_size;
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return l2_size * table_entries;
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}
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static bool qed_is_cluster_size_valid(uint32_t cluster_size)
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96 |
{
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97 |
if (cluster_size < QED_MIN_CLUSTER_SIZE ||
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98 |
cluster_size > QED_MAX_CLUSTER_SIZE) {
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return false;
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}
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if (cluster_size & (cluster_size - 1)) {
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return false; /* not power of 2 */
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}
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return true;
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}
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static bool qed_is_table_size_valid(uint32_t table_size)
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{
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109 |
if (table_size < QED_MIN_TABLE_SIZE ||
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110 |
table_size > QED_MAX_TABLE_SIZE) {
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111 |
return false;
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}
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if (table_size & (table_size - 1)) {
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return false; /* not power of 2 */
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}
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return true;
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}
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static bool qed_is_image_size_valid(uint64_t image_size, uint32_t cluster_size,
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uint32_t table_size)
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{
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122 |
if (image_size % BDRV_SECTOR_SIZE != 0) {
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return false; /* not multiple of sector size */
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}
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if (image_size > qed_max_image_size(cluster_size, table_size)) {
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126 |
return false; /* image is too large */
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}
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return true;
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}
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131 |
/**
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* Read a string of known length from the image file
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*
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* @file: Image file
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* @offset: File offset to start of string, in bytes
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* @n: String length in bytes
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* @buf: Destination buffer
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138 |
* @buflen: Destination buffer length in bytes
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* @ret: 0 on success, -errno on failure
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*
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* The string is NUL-terminated.
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142 |
*/
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143 |
static int qed_read_string(BlockDriverState *file, uint64_t offset, size_t n,
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char *buf, size_t buflen)
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{
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146 |
int ret;
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147 |
if (n >= buflen) {
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148 |
return -EINVAL;
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149 |
}
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150 |
ret = bdrv_pread(file, offset, buf, n);
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151 |
if (ret < 0) {
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152 |
return ret;
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153 |
}
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154 |
buf[n] = '\0';
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155 |
return 0;
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156 |
}
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157 |
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158 |
static int bdrv_qed_open(BlockDriverState *bs, int flags)
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159 |
{
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160 |
BDRVQEDState *s = bs->opaque;
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161 |
QEDHeader le_header;
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162 |
int64_t file_size;
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163 |
int ret;
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164 |
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165 |
s->bs = bs;
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166 |
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167 |
ret = bdrv_pread(bs->file, 0, &le_header, sizeof(le_header));
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168 |
if (ret < 0) {
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169 |
return ret;
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170 |
}
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171 |
ret = 0; /* ret should always be 0 or -errno */
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172 |
qed_header_le_to_cpu(&le_header, &s->header);
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173 |
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174 |
if (s->header.magic != QED_MAGIC) {
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175 |
return -EINVAL;
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176 |
}
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177 |
if (s->header.features & ~QED_FEATURE_MASK) {
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178 |
return -ENOTSUP; /* image uses unsupported feature bits */
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179 |
}
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180 |
if (!qed_is_cluster_size_valid(s->header.cluster_size)) {
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181 |
return -EINVAL;
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182 |
}
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183 |
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184 |
/* Round down file size to the last cluster */
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185 |
file_size = bdrv_getlength(bs->file);
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186 |
if (file_size < 0) {
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187 |
return file_size;
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188 |
}
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189 |
s->file_size = qed_start_of_cluster(s, file_size);
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190 |
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191 |
if (!qed_is_table_size_valid(s->header.table_size)) {
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192 |
return -EINVAL;
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193 |
}
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194 |
if (!qed_is_image_size_valid(s->header.image_size,
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195 |
s->header.cluster_size,
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196 |
s->header.table_size)) {
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197 |
return -EINVAL;
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198 |
}
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199 |
if (!qed_check_table_offset(s, s->header.l1_table_offset)) {
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200 |
return -EINVAL;
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}
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202 |
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203 |
s->table_nelems = (s->header.cluster_size * s->header.table_size) /
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204 |
sizeof(uint64_t);
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s->l2_shift = ffs(s->header.cluster_size) - 1;
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206 |
s->l2_mask = s->table_nelems - 1;
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207 |
s->l1_shift = s->l2_shift + ffs(s->table_nelems) - 1;
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208 |
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209 |
if ((s->header.features & QED_F_BACKING_FILE)) {
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210 |
if ((uint64_t)s->header.backing_filename_offset +
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211 |
s->header.backing_filename_size >
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212 |
s->header.cluster_size * s->header.header_size) {
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213 |
return -EINVAL;
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214 |
}
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215 |
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216 |
ret = qed_read_string(bs->file, s->header.backing_filename_offset,
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217 |
s->header.backing_filename_size, bs->backing_file,
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218 |
sizeof(bs->backing_file));
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219 |
if (ret < 0) {
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220 |
return ret;
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221 |
}
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222 |
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223 |
if (s->header.features & QED_F_BACKING_FORMAT_NO_PROBE) {
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224 |
pstrcpy(bs->backing_format, sizeof(bs->backing_format), "raw");
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225 |
}
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226 |
}
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227 |
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228 |
/* Reset unknown autoclear feature bits. This is a backwards
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229 |
* compatibility mechanism that allows images to be opened by older
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230 |
* programs, which "knock out" unknown feature bits. When an image is
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231 |
* opened by a newer program again it can detect that the autoclear
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232 |
* feature is no longer valid.
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|
233 |
*/
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234 |
if ((s->header.autoclear_features & ~QED_AUTOCLEAR_FEATURE_MASK) != 0 &&
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235 |
!bdrv_is_read_only(bs->file)) {
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236 |
s->header.autoclear_features &= QED_AUTOCLEAR_FEATURE_MASK;
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237 |
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238 |
ret = qed_write_header_sync(s);
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239 |
if (ret) {
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|
240 |
return ret;
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|
241 |
}
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|
242 |
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|
243 |
/* From here on only known autoclear feature bits are valid */
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244 |
bdrv_flush(bs->file);
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245 |
}
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|
246 |
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247 |
return ret;
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248 |
}
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249 |
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250 |
static void bdrv_qed_close(BlockDriverState *bs)
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251 |
{
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252 |
}
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253 |
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254 |
static int bdrv_qed_flush(BlockDriverState *bs)
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255 |
{
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256 |
return bdrv_flush(bs->file);
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257 |
}
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258 |
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259 |
static int qed_create(const char *filename, uint32_t cluster_size,
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260 |
uint64_t image_size, uint32_t table_size,
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261 |
const char *backing_file, const char *backing_fmt)
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|
262 |
{
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263 |
QEDHeader header = {
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264 |
.magic = QED_MAGIC,
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265 |
.cluster_size = cluster_size,
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266 |
.table_size = table_size,
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267 |
.header_size = 1,
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268 |
.features = 0,
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269 |
.compat_features = 0,
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|
270 |
.l1_table_offset = cluster_size,
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|
271 |
.image_size = image_size,
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|
272 |
};
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|
273 |
QEDHeader le_header;
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|
274 |
uint8_t *l1_table = NULL;
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|
275 |
size_t l1_size = header.cluster_size * header.table_size;
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|
276 |
int ret = 0;
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|
277 |
BlockDriverState *bs = NULL;
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278 |
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|
279 |
ret = bdrv_create_file(filename, NULL);
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280 |
if (ret < 0) {
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281 |
return ret;
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282 |
}
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283 |
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|
284 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDWR | BDRV_O_CACHE_WB);
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285 |
if (ret < 0) {
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286 |
return ret;
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|
287 |
}
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|
288 |
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|
289 |
if (backing_file) {
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|
290 |
header.features |= QED_F_BACKING_FILE;
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291 |
header.backing_filename_offset = sizeof(le_header);
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292 |
header.backing_filename_size = strlen(backing_file);
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293 |
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294 |
if (qed_fmt_is_raw(backing_fmt)) {
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295 |
header.features |= QED_F_BACKING_FORMAT_NO_PROBE;
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296 |
}
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|
297 |
}
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|
298 |
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|
299 |
qed_header_cpu_to_le(&header, &le_header);
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300 |
ret = bdrv_pwrite(bs, 0, &le_header, sizeof(le_header));
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301 |
if (ret < 0) {
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302 |
goto out;
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303 |
}
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304 |
ret = bdrv_pwrite(bs, sizeof(le_header), backing_file,
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305 |
header.backing_filename_size);
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306 |
if (ret < 0) {
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|
307 |
goto out;
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|
308 |
}
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|
309 |
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|
310 |
l1_table = qemu_mallocz(l1_size);
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|
311 |
ret = bdrv_pwrite(bs, header.l1_table_offset, l1_table, l1_size);
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|
312 |
if (ret < 0) {
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|
313 |
goto out;
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314 |
}
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|
315 |
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|
316 |
ret = 0; /* success */
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|
317 |
out:
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|
318 |
qemu_free(l1_table);
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|
319 |
bdrv_delete(bs);
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|
320 |
return ret;
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|
321 |
}
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|
322 |
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|
323 |
static int bdrv_qed_create(const char *filename, QEMUOptionParameter *options)
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|
324 |
{
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|
325 |
uint64_t image_size = 0;
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|
326 |
uint32_t cluster_size = QED_DEFAULT_CLUSTER_SIZE;
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|
327 |
uint32_t table_size = QED_DEFAULT_TABLE_SIZE;
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|
328 |
const char *backing_file = NULL;
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|
329 |
const char *backing_fmt = NULL;
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|
330 |
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|
331 |
while (options && options->name) {
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|
332 |
if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
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|
333 |
image_size = options->value.n;
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|
334 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) {
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|
335 |
backing_file = options->value.s;
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|
336 |
} else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) {
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|
337 |
backing_fmt = options->value.s;
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|
338 |
} else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) {
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|
339 |
if (options->value.n) {
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|
340 |
cluster_size = options->value.n;
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|
341 |
}
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|
342 |
} else if (!strcmp(options->name, BLOCK_OPT_TABLE_SIZE)) {
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|
343 |
if (options->value.n) {
|
|
344 |
table_size = options->value.n;
|
|
345 |
}
|
|
346 |
}
|
|
347 |
options++;
|
|
348 |
}
|
|
349 |
|
|
350 |
if (!qed_is_cluster_size_valid(cluster_size)) {
|
|
351 |
fprintf(stderr, "QED cluster size must be within range [%u, %u] and power of 2\n",
|
|
352 |
QED_MIN_CLUSTER_SIZE, QED_MAX_CLUSTER_SIZE);
|
|
353 |
return -EINVAL;
|
|
354 |
}
|
|
355 |
if (!qed_is_table_size_valid(table_size)) {
|
|
356 |
fprintf(stderr, "QED table size must be within range [%u, %u] and power of 2\n",
|
|
357 |
QED_MIN_TABLE_SIZE, QED_MAX_TABLE_SIZE);
|
|
358 |
return -EINVAL;
|
|
359 |
}
|
|
360 |
if (!qed_is_image_size_valid(image_size, cluster_size, table_size)) {
|
|
361 |
fprintf(stderr, "QED image size must be a non-zero multiple of "
|
|
362 |
"cluster size and less than %" PRIu64 " bytes\n",
|
|
363 |
qed_max_image_size(cluster_size, table_size));
|
|
364 |
return -EINVAL;
|
|
365 |
}
|
|
366 |
|
|
367 |
return qed_create(filename, cluster_size, image_size, table_size,
|
|
368 |
backing_file, backing_fmt);
|
|
369 |
}
|
|
370 |
|
|
371 |
static int bdrv_qed_is_allocated(BlockDriverState *bs, int64_t sector_num,
|
|
372 |
int nb_sectors, int *pnum)
|
|
373 |
{
|
|
374 |
return -ENOTSUP;
|
|
375 |
}
|
|
376 |
|
|
377 |
static int bdrv_qed_make_empty(BlockDriverState *bs)
|
|
378 |
{
|
|
379 |
return -ENOTSUP;
|
|
380 |
}
|
|
381 |
|
|
382 |
static BlockDriverAIOCB *bdrv_qed_aio_readv(BlockDriverState *bs,
|
|
383 |
int64_t sector_num,
|
|
384 |
QEMUIOVector *qiov, int nb_sectors,
|
|
385 |
BlockDriverCompletionFunc *cb,
|
|
386 |
void *opaque)
|
|
387 |
{
|
|
388 |
return NULL;
|
|
389 |
}
|
|
390 |
|
|
391 |
static BlockDriverAIOCB *bdrv_qed_aio_writev(BlockDriverState *bs,
|
|
392 |
int64_t sector_num,
|
|
393 |
QEMUIOVector *qiov, int nb_sectors,
|
|
394 |
BlockDriverCompletionFunc *cb,
|
|
395 |
void *opaque)
|
|
396 |
{
|
|
397 |
return NULL;
|
|
398 |
}
|
|
399 |
|
|
400 |
static BlockDriverAIOCB *bdrv_qed_aio_flush(BlockDriverState *bs,
|
|
401 |
BlockDriverCompletionFunc *cb,
|
|
402 |
void *opaque)
|
|
403 |
{
|
|
404 |
return bdrv_aio_flush(bs->file, cb, opaque);
|
|
405 |
}
|
|
406 |
|
|
407 |
static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset)
|
|
408 |
{
|
|
409 |
return -ENOTSUP;
|
|
410 |
}
|
|
411 |
|
|
412 |
static int64_t bdrv_qed_getlength(BlockDriverState *bs)
|
|
413 |
{
|
|
414 |
BDRVQEDState *s = bs->opaque;
|
|
415 |
return s->header.image_size;
|
|
416 |
}
|
|
417 |
|
|
418 |
static int bdrv_qed_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
|
419 |
{
|
|
420 |
BDRVQEDState *s = bs->opaque;
|
|
421 |
|
|
422 |
memset(bdi, 0, sizeof(*bdi));
|
|
423 |
bdi->cluster_size = s->header.cluster_size;
|
|
424 |
return 0;
|
|
425 |
}
|
|
426 |
|
|
427 |
static int bdrv_qed_change_backing_file(BlockDriverState *bs,
|
|
428 |
const char *backing_file,
|
|
429 |
const char *backing_fmt)
|
|
430 |
{
|
|
431 |
BDRVQEDState *s = bs->opaque;
|
|
432 |
QEDHeader new_header, le_header;
|
|
433 |
void *buffer;
|
|
434 |
size_t buffer_len, backing_file_len;
|
|
435 |
int ret;
|
|
436 |
|
|
437 |
/* Refuse to set backing filename if unknown compat feature bits are
|
|
438 |
* active. If the image uses an unknown compat feature then we may not
|
|
439 |
* know the layout of data following the header structure and cannot safely
|
|
440 |
* add a new string.
|
|
441 |
*/
|
|
442 |
if (backing_file && (s->header.compat_features &
|
|
443 |
~QED_COMPAT_FEATURE_MASK)) {
|
|
444 |
return -ENOTSUP;
|
|
445 |
}
|
|
446 |
|
|
447 |
memcpy(&new_header, &s->header, sizeof(new_header));
|
|
448 |
|
|
449 |
new_header.features &= ~(QED_F_BACKING_FILE |
|
|
450 |
QED_F_BACKING_FORMAT_NO_PROBE);
|
|
451 |
|
|
452 |
/* Adjust feature flags */
|
|
453 |
if (backing_file) {
|
|
454 |
new_header.features |= QED_F_BACKING_FILE;
|
|
455 |
|
|
456 |
if (qed_fmt_is_raw(backing_fmt)) {
|
|
457 |
new_header.features |= QED_F_BACKING_FORMAT_NO_PROBE;
|
|
458 |
}
|
|
459 |
}
|
|
460 |
|
|
461 |
/* Calculate new header size */
|
|
462 |
backing_file_len = 0;
|
|
463 |
|
|
464 |
if (backing_file) {
|
|
465 |
backing_file_len = strlen(backing_file);
|
|
466 |
}
|
|
467 |
|
|
468 |
buffer_len = sizeof(new_header);
|
|
469 |
new_header.backing_filename_offset = buffer_len;
|
|
470 |
new_header.backing_filename_size = backing_file_len;
|
|
471 |
buffer_len += backing_file_len;
|
|
472 |
|
|
473 |
/* Make sure we can rewrite header without failing */
|
|
474 |
if (buffer_len > new_header.header_size * new_header.cluster_size) {
|
|
475 |
return -ENOSPC;
|
|
476 |
}
|
|
477 |
|
|
478 |
/* Prepare new header */
|
|
479 |
buffer = qemu_malloc(buffer_len);
|
|
480 |
|
|
481 |
qed_header_cpu_to_le(&new_header, &le_header);
|
|
482 |
memcpy(buffer, &le_header, sizeof(le_header));
|
|
483 |
buffer_len = sizeof(le_header);
|
|
484 |
|
|
485 |
memcpy(buffer + buffer_len, backing_file, backing_file_len);
|
|
486 |
buffer_len += backing_file_len;
|
|
487 |
|
|
488 |
/* Write new header */
|
|
489 |
ret = bdrv_pwrite_sync(bs->file, 0, buffer, buffer_len);
|
|
490 |
qemu_free(buffer);
|
|
491 |
if (ret == 0) {
|
|
492 |
memcpy(&s->header, &new_header, sizeof(new_header));
|
|
493 |
}
|
|
494 |
return ret;
|
|
495 |
}
|
|
496 |
|
|
497 |
static int bdrv_qed_check(BlockDriverState *bs, BdrvCheckResult *result)
|
|
498 |
{
|
|
499 |
return -ENOTSUP;
|
|
500 |
}
|
|
501 |
|
|
502 |
static QEMUOptionParameter qed_create_options[] = {
|
|
503 |
{
|
|
504 |
.name = BLOCK_OPT_SIZE,
|
|
505 |
.type = OPT_SIZE,
|
|
506 |
.help = "Virtual disk size (in bytes)"
|
|
507 |
}, {
|
|
508 |
.name = BLOCK_OPT_BACKING_FILE,
|
|
509 |
.type = OPT_STRING,
|
|
510 |
.help = "File name of a base image"
|
|
511 |
}, {
|
|
512 |
.name = BLOCK_OPT_BACKING_FMT,
|
|
513 |
.type = OPT_STRING,
|
|
514 |
.help = "Image format of the base image"
|
|
515 |
}, {
|
|
516 |
.name = BLOCK_OPT_CLUSTER_SIZE,
|
|
517 |
.type = OPT_SIZE,
|
|
518 |
.help = "Cluster size (in bytes)"
|
|
519 |
}, {
|
|
520 |
.name = BLOCK_OPT_TABLE_SIZE,
|
|
521 |
.type = OPT_SIZE,
|
|
522 |
.help = "L1/L2 table size (in clusters)"
|
|
523 |
},
|
|
524 |
{ /* end of list */ }
|
|
525 |
};
|
|
526 |
|
|
527 |
static BlockDriver bdrv_qed = {
|
|
528 |
.format_name = "qed",
|
|
529 |
.instance_size = sizeof(BDRVQEDState),
|
|
530 |
.create_options = qed_create_options,
|
|
531 |
|
|
532 |
.bdrv_probe = bdrv_qed_probe,
|
|
533 |
.bdrv_open = bdrv_qed_open,
|
|
534 |
.bdrv_close = bdrv_qed_close,
|
|
535 |
.bdrv_create = bdrv_qed_create,
|
|
536 |
.bdrv_flush = bdrv_qed_flush,
|
|
537 |
.bdrv_is_allocated = bdrv_qed_is_allocated,
|
|
538 |
.bdrv_make_empty = bdrv_qed_make_empty,
|
|
539 |
.bdrv_aio_readv = bdrv_qed_aio_readv,
|
|
540 |
.bdrv_aio_writev = bdrv_qed_aio_writev,
|
|
541 |
.bdrv_aio_flush = bdrv_qed_aio_flush,
|
|
542 |
.bdrv_truncate = bdrv_qed_truncate,
|
|
543 |
.bdrv_getlength = bdrv_qed_getlength,
|
|
544 |
.bdrv_get_info = bdrv_qed_get_info,
|
|
545 |
.bdrv_change_backing_file = bdrv_qed_change_backing_file,
|
|
546 |
.bdrv_check = bdrv_qed_check,
|
|
547 |
};
|
|
548 |
|
|
549 |
static void bdrv_qed_init(void)
|
|
550 |
{
|
|
551 |
bdrv_register(&bdrv_qed);
|
|
552 |
}
|
|
553 |
|
|
554 |
block_init(bdrv_qed_init);
|