1 files changed, 114 insertions, 0 deletions
diff --git a/lib/ext2fs/qcow2.h b/lib/ext2fs/qcow2.h
new file mode 100644
index 0000000..b649c9c
--- /dev/null
+++ b/lib/ext2fs/qcow2.h
@@ -0,0 +1,114 @@
+/*
+ * qcow2.h --- structures and function prototypes for qcow2.c to generate
+ * qcow2 formatted disk images.  This format is used originally by QEMU
+ * for virtual machines, and stores the filesystem data on disk in a
+ * packed format to avoid creating sparse image files that need lots of
+ * seeking to read and write.
+ *
+ * The qcow2 format supports zlib compression, but that is not yet
+ * implemented.
+ *
+ * It is possible to directly mount a qcow2 image using qemu-nbd:
+ *
+ * [root]# modprobe nbd max_part=63
+ * [root]# qemu-nbd -c /dev/nbd0 image.img
+ * [root]# mount /dev/nbd0p1 /mnt/qemu
+ *
+ * Format details at http://people.gnome.org/~markmc/qcow-image-format.html
+ *
+ * Copyright (C) 2010 Red Hat, Inc., Lukas Czerner <lczerner@redhat.com>
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ * %End-Header%
+ */
+
+/* Number of l2 tables in memory before writeback */
+#define L2_CACHE_PREALLOC	512
+
+
+#define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
+#define QCOW_VERSION		2
+#define QCOW_OFLAG_COPIED	(1ULL << 63)
+#define QCOW_OFLAG_COMPRESSED	(1ULL << 62)
+
+#define QCOW_COMPRESSED		1
+#define QCOW_ENCRYPTED		2
+#define QCOW_CORRUPTED		3
+
+struct ext2_qcow2_hdr {
+	__u32	magic;
+	__u32	version;
+
+	__u64	backing_file_offset;
+	__u32	backing_file_size;
+
+	__u32	cluster_bits;
+	__u64	size;
+	__u32	crypt_method;
+
+	__u32	l1_size;
+	__u64	l1_table_offset;
+
+	__u64	refcount_table_offset;
+	__u32	refcount_table_clusters;
+
+	__u32	nb_snapshots;
+	__u64	snapshots_offset;
+};
+
+typedef struct ext2_qcow2_l2_table L2_CACHE_HEAD;
+
+struct ext2_qcow2_l2_table {
+	__u32		l1_index;
+	__u64		offset;
+	__u64		*data;
+	L2_CACHE_HEAD	*next;
+};
+
+struct ext2_qcow2_l2_cache {
+	L2_CACHE_HEAD	*used_head;
+	L2_CACHE_HEAD	*used_tail;
+	L2_CACHE_HEAD	*free_head;
+	__u32		free;
+	__u32		count;
+	__u64		next_offset;
+};
+
+struct ext2_qcow2_refcount {
+	__u64	*refcount_table;
+	__u64	refcount_table_offset;
+	__u64	refcount_block_offset;
+
+	__u32	refcount_table_clusters;
+	__u32	refcount_table_index;
+	__u32	refcount_block_index;
+
+	__u16	*refcount_block;
+};
+
+struct ext2_qcow2_image {
+	int	fd;
+	struct	ext2_qcow2_hdr		*hdr;
+	struct	ext2_qcow2_l2_cache	*l2_cache;
+	struct	ext2_qcow2_refcount	refcount;
+	__u32	cluster_size;
+	__u32	cluster_bits;
+	__u32	l1_size;
+	__u32	l2_size;
+
+	__u64	*l1_table;
+	__u64	l2_offset;
+	__u64	l1_offset;
+	__u64	image_size;
+};
+
+/* Function prototypes */
+
+/* qcow2.c */
+
+/* Functions for converting qcow2 image into raw image */
+struct ext2_qcow2_hdr *qcow2_read_header(int);
+int qcow2_write_raw_image(int, int, struct ext2_qcow2_hdr *);
+