qemu/block/vhdx.h

2  * Block driver for Hyper-V VHDX Images
11  *      https://www.microsoft.com/en-us/download/details.aspx?id=34750
14  * See the COPYING.LIB file in the top-level directory.
25 /* Structures and fields present in the VHDX file */
32  * |----------|---------------|------------|--------------|--------------------|
47  * A note on the use of MS-GUID fields.  For more details on the GUID,
51  * bytes are data1-data4. It makes no mention of what algorithm should be used
58 /* ---- HEADER SECTION STRUCTURES ---- */
66     uint16_t    creator[256];           /* optional; utf-16 string to identify
72 /* the guid is a 16 byte unique ID - the definition for this used by
73  * Microsoft is not just 16 bytes though - it is a structure that is defined,
97     uint32_t    checksum;               /* CRC-32C hash of the whole header */
111                                                     - system & user metadata
112                                                     - raw block data
113                                                     - disk size
114                                                     - any change that will
119                                            blocks are re-arranged */
121                                            there is no valid log. If non-zero,
138     uint32_t    checksum;               /* CRC-32C hash of the 64KB table */
146  *  BAT (block allocation table):  2DC27766F62342009D64115E9BFD4A08
153     MSGUID      guid;                   /* 128-bit unique identifier */
161 /* ---- LOG ENTRY STRUCTURES ---- */
168     uint32_t    checksum;               /* CRC-32C hash of the 64KB table */
181     uint64_t    flushed_file_offset;    /* see spec for full details - this
194         uint32_t    trailing_bytes;     /* data desc: bytes 4092-4096 of the
200         uint64_t    leading_bytes;      /* data desc: bytes 0-7 of the data
203     uint64_t    file_offset;            /* file offset to write zeros - multiple
213     uint8_t     data[4084];             /* raw data, bytes 8-4091 (inclusive).
221 /* block states - different state values depending on whether it is a
244 /* ---- METADATA REGION STRUCTURES ---- */
264     MSGUID      item_id;                /* 128-bit identifier for metadata */
270     uint32_t    data_bits;              /* least-significant 3 bits are flags,
285     uint32_t data_bits;                 /* least-significant 2 bits are flags,
318 /* key and value strings are UNICODE strings, UTF-16 LE encoding, no NULs */
327 /* ----- END VHDX SPECIFICATION STRUCTURES ---- */
336     uint16_t present;  member
363     VHDXRegionTableEntry bat_rt;         /* region table for the BAT */
384     VHDXBatEntry *bat;  member
424     guid->data1 = le32_to_cpu(guid->data1);  in leguid_to_cpus()
425     guid->data2 = le16_to_cpu(guid->data2);  in leguid_to_cpus()
426     guid->data3 = le16_to_cpu(guid->data3);  in leguid_to_cpus()
431     guid->data1 = cpu_to_le32(guid->data1);  in cpu_to_leguids()
432     guid->data2 = cpu_to_le16(guid->data2);  in cpu_to_leguids()
433     guid->data3 = cpu_to_le16(guid->data3);  in cpu_to_leguids()