mirror of
https://github.com/apache/cloudstack.git
synced 2025-10-26 08:42:29 +01:00
220 lines
9.9 KiB
C
220 lines
9.9 KiB
C
/* Copyright (c) 2008, XenSource Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* * Neither the name of XenSource Inc. nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
|
|
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
|
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
|
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
#ifndef __VHD_H__
|
|
#define __VHD_H__
|
|
|
|
#include <inttypes.h>
|
|
|
|
typedef uint32_t u32;
|
|
typedef uint64_t u64;
|
|
|
|
#define DEBUG 1
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
/* General definitions. */
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
#define VHD_SECTOR_SIZE 512
|
|
#define VHD_SECTOR_SHIFT 9
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
/* This is the generic disk footer, used by all disks. */
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
struct hd_ftr {
|
|
char cookie[8]; /* Identifies original creator of the disk */
|
|
u32 features; /* Feature Support -- see below */
|
|
u32 ff_version; /* (major,minor) version of disk file */
|
|
u64 data_offset; /* Abs. offset from SOF to next structure */
|
|
u32 timestamp; /* Creation time. secs since 1/1/2000GMT */
|
|
char crtr_app[4]; /* Creator application */
|
|
u32 crtr_ver; /* Creator version (major,minor) */
|
|
u32 crtr_os; /* Creator host OS */
|
|
u64 orig_size; /* Size at creation (bytes) */
|
|
u64 curr_size; /* Current size of disk (bytes) */
|
|
u32 geometry; /* Disk geometry */
|
|
u32 type; /* Disk type */
|
|
u32 checksum; /* 1's comp sum of this struct. */
|
|
blk_uuid_t uuid; /* Unique disk ID, used for naming parents */
|
|
char saved; /* one-bit -- is this disk/VM in a saved state? */
|
|
char hidden; /* tapdisk-specific field: is this vdi hidden? */
|
|
char reserved[426]; /* padding */
|
|
};
|
|
|
|
/* VHD cookie string. */
|
|
static const char HD_COOKIE[9] = "conectix";
|
|
|
|
/* Feature fields in hd_ftr */
|
|
#define HD_NO_FEATURES 0x00000000
|
|
#define HD_TEMPORARY 0x00000001 /* disk can be deleted on shutdown */
|
|
#define HD_RESERVED 0x00000002 /* NOTE: must always be set */
|
|
|
|
/* Version field in hd_ftr */
|
|
#define HD_FF_VERSION 0x00010000
|
|
|
|
/* Known creator OS type fields in hd_ftr.crtr_os */
|
|
#define HD_CR_OS_WINDOWS 0x5769326B /* (Wi2k) */
|
|
#define HD_CR_OS_MACINTOSH 0x4D616320 /* (Mac ) */
|
|
|
|
/*
|
|
* version 0.1: little endian bitmaps
|
|
* version 1.1: big endian bitmaps; batmap
|
|
* version 1.2: libvhd
|
|
* version 1.3: batmap version bump to 1.2
|
|
*/
|
|
#define VHD_VERSION(major, minor) (((major) << 16) | ((minor) & 0x0000FFFF))
|
|
#define VHD_CURRENT_VERSION VHD_VERSION(1, 3)
|
|
|
|
/* Disk geometry accessor macros. */
|
|
/* Geometry is a triple of (cylinders (2 bytes), tracks (1 byte), and
|
|
* secotrs-per-track (1 byte))
|
|
*/
|
|
#define GEOM_GET_CYLS(_g) (((_g) >> 16) & 0xffff)
|
|
#define GEOM_GET_HEADS(_g) (((_g) >> 8) & 0xff)
|
|
#define GEOM_GET_SPT(_g) ((_g) & 0xff)
|
|
|
|
#define GEOM_ENCODE(_c, _h, _s) (((_c) << 16) | ((_h) << 8) | (_s))
|
|
|
|
/* type field in hd_ftr */
|
|
#define HD_TYPE_NONE 0
|
|
#define HD_TYPE_FIXED 2 /* fixed-allocation disk */
|
|
#define HD_TYPE_DYNAMIC 3 /* dynamic disk */
|
|
#define HD_TYPE_DIFF 4 /* differencing disk */
|
|
|
|
/* String table for hd.type */
|
|
static const char *HD_TYPE_STR[7] = {
|
|
"None", /* 0 */
|
|
"Reserved (deprecated)", /* 1 */
|
|
"Fixed hard disk", /* 2 */
|
|
"Dynamic hard disk", /* 3 */
|
|
"Differencing hard disk", /* 4 */
|
|
"Reserved (deprecated)", /* 5 */
|
|
"Reserved (deprecated)" /* 6 */
|
|
};
|
|
|
|
#define HD_TYPE_MAX 6
|
|
|
|
struct prt_loc {
|
|
u32 code; /* Platform code -- see defines below. */
|
|
u32 data_space; /* Number of 512-byte sectors to store locator */
|
|
u32 data_len; /* Actual length of parent locator in bytes */
|
|
u32 res; /* Must be zero */
|
|
u64 data_offset; /* Absolute offset of locator data (bytes) */
|
|
};
|
|
|
|
/* Platform Codes */
|
|
#define PLAT_CODE_NONE 0x0
|
|
#define PLAT_CODE_WI2R 0x57693272 /* deprecated */
|
|
#define PLAT_CODE_WI2K 0x5769326B /* deprecated */
|
|
#define PLAT_CODE_W2RU 0x57327275 /* Windows relative path (UTF-16) */
|
|
#define PLAT_CODE_W2KU 0x57326B75 /* Windows absolute path (UTF-16) */
|
|
#define PLAT_CODE_MAC 0x4D616320 /* MacOS alias stored as a blob. */
|
|
#define PLAT_CODE_MACX 0x4D616358 /* File URL (UTF-8), see RFC 2396. */
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
/* This is the dynamic disk header. */
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
struct dd_hdr {
|
|
char cookie[8]; /* Should contain "cxsparse" */
|
|
u64 data_offset; /* Byte offset of next record. (Unused) 0xffs */
|
|
u64 table_offset; /* Absolute offset to the BAT. */
|
|
u32 hdr_ver; /* Version of the dd_hdr (major,minor) */
|
|
u32 max_bat_size; /* Maximum number of entries in the BAT */
|
|
u32 block_size; /* Block size in bytes. Must be power of 2. */
|
|
u32 checksum; /* Header checksum. 1's comp of all fields. */
|
|
blk_uuid_t prt_uuid; /* ID of the parent disk. */
|
|
u32 prt_ts; /* Modification time of the parent disk */
|
|
u32 res1; /* Reserved. */
|
|
char prt_name[512]; /* Parent unicode name. */
|
|
struct prt_loc loc[8]; /* Parent locator entries. */
|
|
char res2[256]; /* Reserved. */
|
|
};
|
|
|
|
/* VHD cookie string. */
|
|
static const char DD_COOKIE[9] = "cxsparse";
|
|
|
|
/* Version field in hd_ftr */
|
|
#define DD_VERSION 0x00010000
|
|
|
|
/* Default blocksize is 2 meg. */
|
|
#define DD_BLOCKSIZE_DEFAULT 0x00200000
|
|
|
|
#define DD_BLK_UNUSED 0xFFFFFFFF
|
|
|
|
struct dd_batmap_hdr {
|
|
char cookie[8]; /* should contain "tdbatmap" */
|
|
u64 batmap_offset; /* byte offset to batmap */
|
|
u32 batmap_size; /* batmap size in sectors */
|
|
u32 batmap_version; /* version of batmap */
|
|
u32 checksum; /* batmap checksum -- 1's complement of batmap */
|
|
};
|
|
|
|
static const char VHD_BATMAP_COOKIE[9] = "tdbatmap";
|
|
|
|
/*
|
|
* version 1.1: signed char checksum
|
|
*/
|
|
#define VHD_BATMAP_VERSION(major, minor) (((major) << 16) | ((minor) & 0x0000FFFF))
|
|
#define VHD_BATMAP_CURRENT_VERSION VHD_BATMAP_VERSION(1, 2)
|
|
|
|
/* Layout of a dynamic disk:
|
|
*
|
|
* +-------------------------------------------------+
|
|
* | Mirror image of HD footer (hd_ftr) (512 bytes) |
|
|
* +-------------------------------------------------+
|
|
* | Sparse drive header (dd_hdr) (1024 bytes) |
|
|
* +-------------------------------------------------+
|
|
* | BAT (Block allocation table) |
|
|
* | - Array of absolute sector offsets into the |
|
|
* | file (u32). |
|
|
* | - Rounded up to a sector boundary. |
|
|
* | - Unused entries are marked as 0xFFFFFFFF |
|
|
* | - max entries in dd_hdr->max_bat_size |
|
|
* +-------------------------------------------------+
|
|
* | Data Block 0 |
|
|
* | Bitmap (padded to 512 byte sector boundary) |
|
|
* | - each bit indicates whether the associated |
|
|
* | sector within this block is used. |
|
|
* | Data |
|
|
* | - power-of-two multiple of sectors. |
|
|
* | - default 2MB (4096 * 512) |
|
|
* | - Any entries with zero in bitmap should be |
|
|
* | zero on disk |
|
|
* +-------------------------------------------------+
|
|
* | Data Block 1 |
|
|
* +-------------------------------------------------+
|
|
* | ... |
|
|
* +-------------------------------------------------+
|
|
* | Data Block n |
|
|
* +-------------------------------------------------+
|
|
* | HD Footer (511 bytes) |
|
|
* +-------------------------------------------------+
|
|
*/
|
|
|
|
#endif
|