Features/QED: Difference between revisions
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Header { | Header { | ||
uint32_t magic; /* COW2 */ | uint32_t magic; /* COW2 */ | ||
uint32_t features; /* format feature bits */ | |||
uint32_t chunk_size; /* in bytes */ | uint32_t chunk_size; /* in bytes */ | ||
uint64_t max_chunks; /* total image size in bytes = max_chunks * chunks_size */ | uint64_t max_chunks; /* total image size in bytes = max_chunks * chunks_size */ | ||
uint32_t backing_offset; /* backing filename offset from start of file */ | |||
} | } | ||
Revision as of 15:04, 24 August 2010
Specification
The file format looks like this:
+--------+--------------+---------+---------+-----+ | header | extent table | extent0 | extent1 | ... | +--------+--------------+---------+---------+-----+
Header
Header {
uint32_t magic; /* COW2 */
uint32_t features; /* format feature bits */
uint32_t chunk_size; /* in bytes */
uint64_t max_chunks; /* total image size in bytes = max_chunks * chunks_size */
uint32_t backing_offset; /* backing filename offset from start of file */ }