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qcow2: Version 3 images
This adds the basic infrastructure to qcow2 to handle version 3 images. It includes code to create v3 images, allow header updates for v3 images and checks feature bits. It still misses support for zero clusters, so this is not a fully compliant implementation of v3 yet. The default for creating new images stays at v2 for now. Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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afdf0abe77
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3 changed files with 149 additions and 15 deletions
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@ -33,7 +33,6 @@
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//#define DEBUG_EXT
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#define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
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#define QCOW_VERSION 2
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#define QCOW_CRYPT_NONE 0
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#define QCOW_CRYPT_AES 1
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@ -71,6 +70,14 @@ typedef struct QCowHeader {
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uint32_t refcount_table_clusters;
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uint32_t nb_snapshots;
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uint64_t snapshots_offset;
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/* The following fields are only valid for version >= 3 */
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uint64_t incompatible_features;
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uint64_t compatible_features;
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uint64_t autoclear_features;
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uint32_t refcount_order;
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uint32_t header_length;
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} QCowHeader;
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typedef struct QCowSnapshot {
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@ -135,6 +142,14 @@ typedef struct BDRVQcowState {
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QCowSnapshot *snapshots;
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int flags;
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int qcow_version;
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uint64_t incompatible_features;
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uint64_t compatible_features;
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uint64_t autoclear_features;
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size_t unknown_header_fields_size;
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void* unknown_header_fields;
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QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext;
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} BDRVQcowState;
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