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* qcow2.h --- structures and function prototypes for qcow2.c to generate

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* qcow2 formatted disk images. This format is used originally by QEMU

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* for virtual machines, and stores the filesystem data on disk in a

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* packed format to avoid creating sparse image files that need lots of

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* seeking to read and write.

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* The qcow2 format supports zlib compression, but that is not yet

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* implemented.

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* It is possible to directly mount a qcow2 image using qemu-nbd:

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* [root]# modprobe nbd max_part=63

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* [root]# qemu-nbd -c /dev/nbd0 image.img

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* [root]# mount /dev/nbd0p1 /mnt/qemu

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* Format details at http://people.gnome.org/~markmc/qcow-image-format.html

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* %Begin-Header%

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* This file may be redistributed under the terms of the GNU Public

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* License.

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* %End-Header%

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/* Number of l2 tables in memory before writeback */

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#define L2_CACHE_PREALLOC 512

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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_OFLAG_COPIED (1ULL << 63)

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#define QCOW_OFLAG_COMPRESSED (1ULL << 62)

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#define QCOW_COMPRESSED 1

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#define QCOW_ENCRYPTED 2

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#define QCOW_CORRUPTED 3

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struct ext2_qcow2_hdr {

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__u32 magic;

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__u32 version;

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__u64 backing_file_offset;

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__u32 backing_file_size;

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__u32 cluster_bits;

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__u64 size;

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__u32 crypt_method;

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__u32 l1_size;

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__u64 l1_table_offset;

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__u64 refcount_table_offset;

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__u32 refcount_table_clusters;

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__u32 nb_snapshots;

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__u64 snapshots_offset;

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};

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typedef struct ext2_qcow2_l2_table L2_CACHE_HEAD;

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struct ext2_qcow2_l2_table {

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__u32 l1_index;

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__u64 offset;

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__u64 *data;

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L2_CACHE_HEAD *next;

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};

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struct ext2_qcow2_l2_cache {

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L2_CACHE_HEAD *used_head;

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L2_CACHE_HEAD *used_tail;

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L2_CACHE_HEAD *free_head;

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__u32 free;

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__u32 count;

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__u64 next_offset;

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};

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struct ext2_qcow2_refcount {

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__u64 *refcount_table;

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__u64 refcount_table_offset;

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__u64 refcount_block_offset;

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__u32 refcount_table_clusters;

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__u32 refcount_table_index;

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__u32 refcount_block_index;

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__u16 *refcount_block;

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};

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struct ext2_qcow2_image {

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int fd;

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struct ext2_qcow2_hdr *hdr;

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struct ext2_qcow2_l2_cache *l2_cache;

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struct ext2_qcow2_refcount refcount;

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__u32 cluster_size;

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__u32 cluster_bits;

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__u32 l1_size;

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__u32 l2_size;

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__u64 *l1_table;

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__u64 l2_offset;

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__u64 l1_offset;

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__u64 image_size;

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};

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/* Function prototypes */

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/* qcow2.c */

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/* Functions for converting qcow2 image into raw image */

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struct ext2_qcow2_hdr *qcow2_read_header(int);

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int qcow2_write_raw_image(int, int, struct ext2_qcow2_hdr *);

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