Commits

Anonymous committed ae9d2b8 Merge

Merge tag 'disintegrate-raid-20121009' of git://git.infradead.org/users/dhowells/linux-headers into for-next

UAPI Disintegration 2012-10-09

Comments (0)

Files changed (6)

include/linux/raid/Kbuild

-header-y += md_p.h
-header-y += md_u.h

include/linux/raid/md_p.h

-/*
-   md_p.h : physical layout of Linux RAID devices
-          Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
-	  
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-   
-   You should have received a copy of the GNU General Public License
-   (for example /usr/src/linux/COPYING); if not, write to the Free
-   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
-*/
-
-#ifndef _MD_P_H
-#define _MD_P_H
-
-#include <linux/types.h>
-
-/*
- * RAID superblock.
- *
- * The RAID superblock maintains some statistics on each RAID configuration.
- * Each real device in the RAID set contains it near the end of the device.
- * Some of the ideas are copied from the ext2fs implementation.
- *
- * We currently use 4096 bytes as follows:
- *
- *	word offset	function
- *
- *	   0  -    31	Constant generic RAID device information.
- *        32  -    63   Generic state information.
- *	  64  -   127	Personality specific information.
- *	 128  -   511	12 32-words descriptors of the disks in the raid set.
- *	 512  -   911	Reserved.
- *	 912  -  1023	Disk specific descriptor.
- */
-
-/*
- * If x is the real device size in bytes, we return an apparent size of:
- *
- *	y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES
- *
- * and place the 4kB superblock at offset y.
- */
-#define MD_RESERVED_BYTES		(64 * 1024)
-#define MD_RESERVED_SECTORS		(MD_RESERVED_BYTES / 512)
-
-#define MD_NEW_SIZE_SECTORS(x)		((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
-
-#define MD_SB_BYTES			4096
-#define MD_SB_WORDS			(MD_SB_BYTES / 4)
-#define MD_SB_SECTORS			(MD_SB_BYTES / 512)
-
-/*
- * The following are counted in 32-bit words
- */
-#define	MD_SB_GENERIC_OFFSET		0
-#define MD_SB_PERSONALITY_OFFSET	64
-#define MD_SB_DISKS_OFFSET		128
-#define MD_SB_DESCRIPTOR_OFFSET		992
-
-#define MD_SB_GENERIC_CONSTANT_WORDS	32
-#define MD_SB_GENERIC_STATE_WORDS	32
-#define MD_SB_GENERIC_WORDS		(MD_SB_GENERIC_CONSTANT_WORDS + MD_SB_GENERIC_STATE_WORDS)
-#define MD_SB_PERSONALITY_WORDS		64
-#define MD_SB_DESCRIPTOR_WORDS		32
-#define MD_SB_DISKS			27
-#define MD_SB_DISKS_WORDS		(MD_SB_DISKS*MD_SB_DESCRIPTOR_WORDS)
-#define MD_SB_RESERVED_WORDS		(1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_WORDS - MD_SB_DESCRIPTOR_WORDS)
-#define MD_SB_EQUAL_WORDS		(MD_SB_GENERIC_WORDS + MD_SB_PERSONALITY_WORDS + MD_SB_DISKS_WORDS)
-
-/*
- * Device "operational" state bits
- */
-#define MD_DISK_FAULTY		0 /* disk is faulty / operational */
-#define MD_DISK_ACTIVE		1 /* disk is running or spare disk */
-#define MD_DISK_SYNC		2 /* disk is in sync with the raid set */
-#define MD_DISK_REMOVED		3 /* disk is in sync with the raid set */
-
-#define	MD_DISK_WRITEMOSTLY	9 /* disk is "write-mostly" is RAID1 config.
-				   * read requests will only be sent here in
-				   * dire need
-				   */
-
-typedef struct mdp_device_descriptor_s {
-	__u32 number;		/* 0 Device number in the entire set	      */
-	__u32 major;		/* 1 Device major number		      */
-	__u32 minor;		/* 2 Device minor number		      */
-	__u32 raid_disk;	/* 3 The role of the device in the raid set   */
-	__u32 state;		/* 4 Operational state			      */
-	__u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5];
-} mdp_disk_t;
-
-#define MD_SB_MAGIC		0xa92b4efc
-
-/*
- * Superblock state bits
- */
-#define MD_SB_CLEAN		0
-#define MD_SB_ERRORS		1
-
-#define	MD_SB_BITMAP_PRESENT	8 /* bitmap may be present nearby */
-
-/*
- * Notes:
- * - if an array is being reshaped (restriped) in order to change the
- *   the number of active devices in the array, 'raid_disks' will be
- *   the larger of the old and new numbers.  'delta_disks' will
- *   be the "new - old".  So if +ve, raid_disks is the new value, and
- *   "raid_disks-delta_disks" is the old.  If -ve, raid_disks is the
- *   old value and "raid_disks+delta_disks" is the new (smaller) value.
- */
-
-
-typedef struct mdp_superblock_s {
-	/*
-	 * Constant generic information
-	 */
-	__u32 md_magic;		/*  0 MD identifier 			      */
-	__u32 major_version;	/*  1 major version to which the set conforms */
-	__u32 minor_version;	/*  2 minor version ...			      */
-	__u32 patch_version;	/*  3 patchlevel version ...		      */
-	__u32 gvalid_words;	/*  4 Number of used words in this section    */
-	__u32 set_uuid0;	/*  5 Raid set identifier		      */
-	__u32 ctime;		/*  6 Creation time			      */
-	__u32 level;		/*  7 Raid personality			      */
-	__u32 size;		/*  8 Apparent size of each individual disk   */
-	__u32 nr_disks;		/*  9 total disks in the raid set	      */
-	__u32 raid_disks;	/* 10 disks in a fully functional raid set    */
-	__u32 md_minor;		/* 11 preferred MD minor device number	      */
-	__u32 not_persistent;	/* 12 does it have a persistent superblock    */
-	__u32 set_uuid1;	/* 13 Raid set identifier #2		      */
-	__u32 set_uuid2;	/* 14 Raid set identifier #3		      */
-	__u32 set_uuid3;	/* 15 Raid set identifier #4		      */
-	__u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 16];
-
-	/*
-	 * Generic state information
-	 */
-	__u32 utime;		/*  0 Superblock update time		      */
-	__u32 state;		/*  1 State bits (clean, ...)		      */
-	__u32 active_disks;	/*  2 Number of currently active disks	      */
-	__u32 working_disks;	/*  3 Number of working disks		      */
-	__u32 failed_disks;	/*  4 Number of failed disks		      */
-	__u32 spare_disks;	/*  5 Number of spare disks		      */
-	__u32 sb_csum;		/*  6 checksum of the whole superblock        */
-#ifdef __BIG_ENDIAN
-	__u32 events_hi;	/*  7 high-order of superblock update count   */
-	__u32 events_lo;	/*  8 low-order of superblock update count    */
-	__u32 cp_events_hi;	/*  9 high-order of checkpoint update count   */
-	__u32 cp_events_lo;	/* 10 low-order of checkpoint update count    */
-#else
-	__u32 events_lo;	/*  7 low-order of superblock update count    */
-	__u32 events_hi;	/*  8 high-order of superblock update count   */
-	__u32 cp_events_lo;	/*  9 low-order of checkpoint update count    */
-	__u32 cp_events_hi;	/* 10 high-order of checkpoint update count   */
-#endif
-	__u32 recovery_cp;	/* 11 recovery checkpoint sector count	      */
-	/* There are only valid for minor_version > 90 */
-	__u64 reshape_position;	/* 12,13 next address in array-space for reshape */
-	__u32 new_level;	/* 14 new level we are reshaping to	      */
-	__u32 delta_disks;	/* 15 change in number of raid_disks	      */
-	__u32 new_layout;	/* 16 new layout			      */
-	__u32 new_chunk;	/* 17 new chunk size (bytes)		      */
-	__u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 18];
-
-	/*
-	 * Personality information
-	 */
-	__u32 layout;		/*  0 the array's physical layout	      */
-	__u32 chunk_size;	/*  1 chunk size in bytes		      */
-	__u32 root_pv;		/*  2 LV root PV */
-	__u32 root_block;	/*  3 LV root block */
-	__u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 4];
-
-	/*
-	 * Disks information
-	 */
-	mdp_disk_t disks[MD_SB_DISKS];
-
-	/*
-	 * Reserved
-	 */
-	__u32 reserved[MD_SB_RESERVED_WORDS];
-
-	/*
-	 * Active descriptor
-	 */
-	mdp_disk_t this_disk;
-
-} mdp_super_t;
-
-static inline __u64 md_event(mdp_super_t *sb) {
-	__u64 ev = sb->events_hi;
-	return (ev<<32)| sb->events_lo;
-}
-
-#define MD_SUPERBLOCK_1_TIME_SEC_MASK ((1ULL<<40) - 1)
-
-/*
- * The version-1 superblock :
- * All numeric fields are little-endian.
- *
- * total size: 256 bytes plus 2 per device.
- *  1K allows 384 devices.
- */
-struct mdp_superblock_1 {
-	/* constant array information - 128 bytes */
-	__le32	magic;		/* MD_SB_MAGIC: 0xa92b4efc - little endian */
-	__le32	major_version;	/* 1 */
-	__le32	feature_map;	/* bit 0 set if 'bitmap_offset' is meaningful */
-	__le32	pad0;		/* always set to 0 when writing */
-
-	__u8	set_uuid[16];	/* user-space generated. */
-	char	set_name[32];	/* set and interpreted by user-space */
-
-	__le64	ctime;		/* lo 40 bits are seconds, top 24 are microseconds or 0*/
-	__le32	level;		/* -4 (multipath), -1 (linear), 0,1,4,5 */
-	__le32	layout;		/* only for raid5 and raid10 currently */
-	__le64	size;		/* used size of component devices, in 512byte sectors */
-
-	__le32	chunksize;	/* in 512byte sectors */
-	__le32	raid_disks;
-	__le32	bitmap_offset;	/* sectors after start of superblock that bitmap starts
-				 * NOTE: signed, so bitmap can be before superblock
-				 * only meaningful of feature_map[0] is set.
-				 */
-
-	/* These are only valid with feature bit '4' */
-	__le32	new_level;	/* new level we are reshaping to		*/
-	__le64	reshape_position;	/* next address in array-space for reshape */
-	__le32	delta_disks;	/* change in number of raid_disks		*/
-	__le32	new_layout;	/* new layout					*/
-	__le32	new_chunk;	/* new chunk size (512byte sectors)		*/
-	__le32  new_offset;	/* signed number to add to data_offset in new
-				 * layout.  0 == no-change.  This can be
-				 * different on each device in the array.
-				 */
-
-	/* constant this-device information - 64 bytes */
-	__le64	data_offset;	/* sector start of data, often 0 */
-	__le64	data_size;	/* sectors in this device that can be used for data */
-	__le64	super_offset;	/* sector start of this superblock */
-	__le64	recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
-	__le32	dev_number;	/* permanent identifier of this  device - not role in raid */
-	__le32	cnt_corrected_read; /* number of read errors that were corrected by re-writing */
-	__u8	device_uuid[16]; /* user-space setable, ignored by kernel */
-	__u8	devflags;	/* per-device flags.  Only one defined...*/
-#define	WriteMostly1	1	/* mask for writemostly flag in above */
-	/* Bad block log.  If there are any bad blocks the feature flag is set.
-	 * If offset and size are non-zero, that space is reserved and available
-	 */
-	__u8	bblog_shift;	/* shift from sectors to block size */
-	__le16	bblog_size;	/* number of sectors reserved for list */
-	__le32	bblog_offset;	/* sector offset from superblock to bblog,
-				 * signed - not unsigned */
-
-	/* array state information - 64 bytes */
-	__le64	utime;		/* 40 bits second, 24 bits microseconds */
-	__le64	events;		/* incremented when superblock updated */
-	__le64	resync_offset;	/* data before this offset (from data_offset) known to be in sync */
-	__le32	sb_csum;	/* checksum up to devs[max_dev] */
-	__le32	max_dev;	/* size of devs[] array to consider */
-	__u8	pad3[64-32];	/* set to 0 when writing */
-
-	/* device state information. Indexed by dev_number.
-	 * 2 bytes per device
-	 * Note there are no per-device state flags. State information is rolled
-	 * into the 'roles' value.  If a device is spare or faulty, then it doesn't
-	 * have a meaningful role.
-	 */
-	__le16	dev_roles[0];	/* role in array, or 0xffff for a spare, or 0xfffe for faulty */
-};
-
-/* feature_map bits */
-#define MD_FEATURE_BITMAP_OFFSET	1
-#define	MD_FEATURE_RECOVERY_OFFSET	2 /* recovery_offset is present and
-					   * must be honoured
-					   */
-#define	MD_FEATURE_RESHAPE_ACTIVE	4
-#define	MD_FEATURE_BAD_BLOCKS		8 /* badblock list is not empty */
-#define	MD_FEATURE_REPLACEMENT		16 /* This device is replacing an
-					    * active device with same 'role'.
-					    * 'recovery_offset' is also set.
-					    */
-#define	MD_FEATURE_RESHAPE_BACKWARDS	32 /* Reshape doesn't change number
-					    * of devices, but is going
-					    * backwards anyway.
-					    */
-#define	MD_FEATURE_NEW_OFFSET		64 /* new_offset must be honoured */
-#define	MD_FEATURE_ALL			(MD_FEATURE_BITMAP_OFFSET	\
-					|MD_FEATURE_RECOVERY_OFFSET	\
-					|MD_FEATURE_RESHAPE_ACTIVE	\
-					|MD_FEATURE_BAD_BLOCKS		\
-					|MD_FEATURE_REPLACEMENT		\
-					|MD_FEATURE_RESHAPE_BACKWARDS	\
-					|MD_FEATURE_NEW_OFFSET		\
-					)
-
-#endif 

include/linux/raid/md_u.h

    (for example /usr/src/linux/COPYING); if not, write to the Free
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
 */
-
 #ifndef _MD_U_H
 #define _MD_U_H
 
-/*
- * Different major versions are not compatible.
- * Different minor versions are only downward compatible.
- * Different patchlevel versions are downward and upward compatible.
- */
-#define MD_MAJOR_VERSION                0
-#define MD_MINOR_VERSION                90
-/*
- * MD_PATCHLEVEL_VERSION indicates kernel functionality.
- * >=1 means different superblock formats are selectable using SET_ARRAY_INFO
- *     and major_version/minor_version accordingly
- * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
- *     in the super status byte
- * >=3 means that bitmap superblock version 4 is supported, which uses
- *     little-ending representation rather than host-endian
- */
-#define MD_PATCHLEVEL_VERSION           3
-
-/* ioctls */
-
-/* status */
-#define RAID_VERSION		_IOR (MD_MAJOR, 0x10, mdu_version_t)
-#define GET_ARRAY_INFO		_IOR (MD_MAJOR, 0x11, mdu_array_info_t)
-#define GET_DISK_INFO		_IOR (MD_MAJOR, 0x12, mdu_disk_info_t)
-#define PRINT_RAID_DEBUG	_IO (MD_MAJOR, 0x13)
-#define RAID_AUTORUN		_IO (MD_MAJOR, 0x14)
-#define GET_BITMAP_FILE		_IOR (MD_MAJOR, 0x15, mdu_bitmap_file_t)
-
-/* configuration */
-#define CLEAR_ARRAY		_IO (MD_MAJOR, 0x20)
-#define ADD_NEW_DISK		_IOW (MD_MAJOR, 0x21, mdu_disk_info_t)
-#define HOT_REMOVE_DISK		_IO (MD_MAJOR, 0x22)
-#define SET_ARRAY_INFO		_IOW (MD_MAJOR, 0x23, mdu_array_info_t)
-#define SET_DISK_INFO		_IO (MD_MAJOR, 0x24)
-#define WRITE_RAID_INFO		_IO (MD_MAJOR, 0x25)
-#define UNPROTECT_ARRAY		_IO (MD_MAJOR, 0x26)
-#define PROTECT_ARRAY		_IO (MD_MAJOR, 0x27)
-#define HOT_ADD_DISK		_IO (MD_MAJOR, 0x28)
-#define SET_DISK_FAULTY		_IO (MD_MAJOR, 0x29)
-#define HOT_GENERATE_ERROR	_IO (MD_MAJOR, 0x2a)
-#define SET_BITMAP_FILE		_IOW (MD_MAJOR, 0x2b, int)
+#include <uapi/linux/raid/md_u.h>
 
-/* usage */
-#define RUN_ARRAY		_IOW (MD_MAJOR, 0x30, mdu_param_t)
-/*  0x31 was START_ARRAY  */
-#define STOP_ARRAY		_IO (MD_MAJOR, 0x32)
-#define STOP_ARRAY_RO		_IO (MD_MAJOR, 0x33)
-#define RESTART_ARRAY_RW	_IO (MD_MAJOR, 0x34)
-
-/* 63 partitions with the alternate major number (mdp) */
-#define MdpMinorShift 6
-#ifdef __KERNEL__
 extern int mdp_major;
-#endif
-
-typedef struct mdu_version_s {
-	int major;
-	int minor;
-	int patchlevel;
-} mdu_version_t;
-
-typedef struct mdu_array_info_s {
-	/*
-	 * Generic constant information
-	 */
-	int major_version;
-	int minor_version;
-	int patch_version;
-	int ctime;
-	int level;
-	int size;
-	int nr_disks;
-	int raid_disks;
-	int md_minor;
-	int not_persistent;
-
-	/*
-	 * Generic state information
-	 */
-	int utime;		/*  0 Superblock update time		      */
-	int state;		/*  1 State bits (clean, ...)		      */
-	int active_disks;	/*  2 Number of currently active disks	      */
-	int working_disks;	/*  3 Number of working disks		      */
-	int failed_disks;	/*  4 Number of failed disks		      */
-	int spare_disks;	/*  5 Number of spare disks		      */
-
-	/*
-	 * Personality information
-	 */
-	int layout;		/*  0 the array's physical layout	      */
-	int chunk_size;	/*  1 chunk size in bytes		      */
-
-} mdu_array_info_t;
-
-/* non-obvious values for 'level' */
-#define	LEVEL_MULTIPATH		(-4)
-#define	LEVEL_LINEAR		(-1)
-#define	LEVEL_FAULTY		(-5)
-
-/* we need a value for 'no level specified' and 0
- * means 'raid0', so we need something else.  This is
- * for internal use only
- */
-#define	LEVEL_NONE		(-1000000)
-
-typedef struct mdu_disk_info_s {
-	/*
-	 * configuration/status of one particular disk
-	 */
-	int number;
-	int major;
-	int minor;
-	int raid_disk;
-	int state;
-
-} mdu_disk_info_t;
-
-typedef struct mdu_start_info_s {
-	/*
-	 * configuration/status of one particular disk
-	 */
-	int major;
-	int minor;
-	int raid_disk;
-	int state;
-
-} mdu_start_info_t;
-
-typedef struct mdu_bitmap_file_s
-{
-	char pathname[4096];
-} mdu_bitmap_file_t;
-
-typedef struct mdu_param_s
-{
-	int			personality;	/* 1,2,3,4 */
-	int			chunk_size;	/* in bytes */
-	int			max_fault;	/* unused for now */
-} mdu_param_t;
-
 #endif 
-

include/uapi/linux/raid/Kbuild

 # UAPI Header export list
+header-y += md_p.h
+header-y += md_u.h

include/uapi/linux/raid/md_p.h

+/*
+   md_p.h : physical layout of Linux RAID devices
+          Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
+	  
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+   
+   You should have received a copy of the GNU General Public License
+   (for example /usr/src/linux/COPYING); if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
+*/
+
+#ifndef _MD_P_H
+#define _MD_P_H
+
+#include <linux/types.h>
+
+/*
+ * RAID superblock.
+ *
+ * The RAID superblock maintains some statistics on each RAID configuration.
+ * Each real device in the RAID set contains it near the end of the device.
+ * Some of the ideas are copied from the ext2fs implementation.
+ *
+ * We currently use 4096 bytes as follows:
+ *
+ *	word offset	function
+ *
+ *	   0  -    31	Constant generic RAID device information.
+ *        32  -    63   Generic state information.
+ *	  64  -   127	Personality specific information.
+ *	 128  -   511	12 32-words descriptors of the disks in the raid set.
+ *	 512  -   911	Reserved.
+ *	 912  -  1023	Disk specific descriptor.
+ */
+
+/*
+ * If x is the real device size in bytes, we return an apparent size of:
+ *
+ *	y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES
+ *
+ * and place the 4kB superblock at offset y.
+ */
+#define MD_RESERVED_BYTES		(64 * 1024)
+#define MD_RESERVED_SECTORS		(MD_RESERVED_BYTES / 512)
+
+#define MD_NEW_SIZE_SECTORS(x)		((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
+
+#define MD_SB_BYTES			4096
+#define MD_SB_WORDS			(MD_SB_BYTES / 4)
+#define MD_SB_SECTORS			(MD_SB_BYTES / 512)
+
+/*
+ * The following are counted in 32-bit words
+ */
+#define	MD_SB_GENERIC_OFFSET		0
+#define MD_SB_PERSONALITY_OFFSET	64
+#define MD_SB_DISKS_OFFSET		128
+#define MD_SB_DESCRIPTOR_OFFSET		992
+
+#define MD_SB_GENERIC_CONSTANT_WORDS	32
+#define MD_SB_GENERIC_STATE_WORDS	32
+#define MD_SB_GENERIC_WORDS		(MD_SB_GENERIC_CONSTANT_WORDS + MD_SB_GENERIC_STATE_WORDS)
+#define MD_SB_PERSONALITY_WORDS		64
+#define MD_SB_DESCRIPTOR_WORDS		32
+#define MD_SB_DISKS			27
+#define MD_SB_DISKS_WORDS		(MD_SB_DISKS*MD_SB_DESCRIPTOR_WORDS)
+#define MD_SB_RESERVED_WORDS		(1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_WORDS - MD_SB_DESCRIPTOR_WORDS)
+#define MD_SB_EQUAL_WORDS		(MD_SB_GENERIC_WORDS + MD_SB_PERSONALITY_WORDS + MD_SB_DISKS_WORDS)
+
+/*
+ * Device "operational" state bits
+ */
+#define MD_DISK_FAULTY		0 /* disk is faulty / operational */
+#define MD_DISK_ACTIVE		1 /* disk is running or spare disk */
+#define MD_DISK_SYNC		2 /* disk is in sync with the raid set */
+#define MD_DISK_REMOVED		3 /* disk is in sync with the raid set */
+
+#define	MD_DISK_WRITEMOSTLY	9 /* disk is "write-mostly" is RAID1 config.
+				   * read requests will only be sent here in
+				   * dire need
+				   */
+
+typedef struct mdp_device_descriptor_s {
+	__u32 number;		/* 0 Device number in the entire set	      */
+	__u32 major;		/* 1 Device major number		      */
+	__u32 minor;		/* 2 Device minor number		      */
+	__u32 raid_disk;	/* 3 The role of the device in the raid set   */
+	__u32 state;		/* 4 Operational state			      */
+	__u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5];
+} mdp_disk_t;
+
+#define MD_SB_MAGIC		0xa92b4efc
+
+/*
+ * Superblock state bits
+ */
+#define MD_SB_CLEAN		0
+#define MD_SB_ERRORS		1
+
+#define	MD_SB_BITMAP_PRESENT	8 /* bitmap may be present nearby */
+
+/*
+ * Notes:
+ * - if an array is being reshaped (restriped) in order to change the
+ *   the number of active devices in the array, 'raid_disks' will be
+ *   the larger of the old and new numbers.  'delta_disks' will
+ *   be the "new - old".  So if +ve, raid_disks is the new value, and
+ *   "raid_disks-delta_disks" is the old.  If -ve, raid_disks is the
+ *   old value and "raid_disks+delta_disks" is the new (smaller) value.
+ */
+
+
+typedef struct mdp_superblock_s {
+	/*
+	 * Constant generic information
+	 */
+	__u32 md_magic;		/*  0 MD identifier 			      */
+	__u32 major_version;	/*  1 major version to which the set conforms */
+	__u32 minor_version;	/*  2 minor version ...			      */
+	__u32 patch_version;	/*  3 patchlevel version ...		      */
+	__u32 gvalid_words;	/*  4 Number of used words in this section    */
+	__u32 set_uuid0;	/*  5 Raid set identifier		      */
+	__u32 ctime;		/*  6 Creation time			      */
+	__u32 level;		/*  7 Raid personality			      */
+	__u32 size;		/*  8 Apparent size of each individual disk   */
+	__u32 nr_disks;		/*  9 total disks in the raid set	      */
+	__u32 raid_disks;	/* 10 disks in a fully functional raid set    */
+	__u32 md_minor;		/* 11 preferred MD minor device number	      */
+	__u32 not_persistent;	/* 12 does it have a persistent superblock    */
+	__u32 set_uuid1;	/* 13 Raid set identifier #2		      */
+	__u32 set_uuid2;	/* 14 Raid set identifier #3		      */
+	__u32 set_uuid3;	/* 15 Raid set identifier #4		      */
+	__u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 16];
+
+	/*
+	 * Generic state information
+	 */
+	__u32 utime;		/*  0 Superblock update time		      */
+	__u32 state;		/*  1 State bits (clean, ...)		      */
+	__u32 active_disks;	/*  2 Number of currently active disks	      */
+	__u32 working_disks;	/*  3 Number of working disks		      */
+	__u32 failed_disks;	/*  4 Number of failed disks		      */
+	__u32 spare_disks;	/*  5 Number of spare disks		      */
+	__u32 sb_csum;		/*  6 checksum of the whole superblock        */
+#ifdef __BIG_ENDIAN
+	__u32 events_hi;	/*  7 high-order of superblock update count   */
+	__u32 events_lo;	/*  8 low-order of superblock update count    */
+	__u32 cp_events_hi;	/*  9 high-order of checkpoint update count   */
+	__u32 cp_events_lo;	/* 10 low-order of checkpoint update count    */
+#else
+	__u32 events_lo;	/*  7 low-order of superblock update count    */
+	__u32 events_hi;	/*  8 high-order of superblock update count   */
+	__u32 cp_events_lo;	/*  9 low-order of checkpoint update count    */
+	__u32 cp_events_hi;	/* 10 high-order of checkpoint update count   */
+#endif
+	__u32 recovery_cp;	/* 11 recovery checkpoint sector count	      */
+	/* There are only valid for minor_version > 90 */
+	__u64 reshape_position;	/* 12,13 next address in array-space for reshape */
+	__u32 new_level;	/* 14 new level we are reshaping to	      */
+	__u32 delta_disks;	/* 15 change in number of raid_disks	      */
+	__u32 new_layout;	/* 16 new layout			      */
+	__u32 new_chunk;	/* 17 new chunk size (bytes)		      */
+	__u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 18];
+
+	/*
+	 * Personality information
+	 */
+	__u32 layout;		/*  0 the array's physical layout	      */
+	__u32 chunk_size;	/*  1 chunk size in bytes		      */
+	__u32 root_pv;		/*  2 LV root PV */
+	__u32 root_block;	/*  3 LV root block */
+	__u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 4];
+
+	/*
+	 * Disks information
+	 */
+	mdp_disk_t disks[MD_SB_DISKS];
+
+	/*
+	 * Reserved
+	 */
+	__u32 reserved[MD_SB_RESERVED_WORDS];
+
+	/*
+	 * Active descriptor
+	 */
+	mdp_disk_t this_disk;
+
+} mdp_super_t;
+
+static inline __u64 md_event(mdp_super_t *sb) {
+	__u64 ev = sb->events_hi;
+	return (ev<<32)| sb->events_lo;
+}
+
+#define MD_SUPERBLOCK_1_TIME_SEC_MASK ((1ULL<<40) - 1)
+
+/*
+ * The version-1 superblock :
+ * All numeric fields are little-endian.
+ *
+ * total size: 256 bytes plus 2 per device.
+ *  1K allows 384 devices.
+ */
+struct mdp_superblock_1 {
+	/* constant array information - 128 bytes */
+	__le32	magic;		/* MD_SB_MAGIC: 0xa92b4efc - little endian */
+	__le32	major_version;	/* 1 */
+	__le32	feature_map;	/* bit 0 set if 'bitmap_offset' is meaningful */
+	__le32	pad0;		/* always set to 0 when writing */
+
+	__u8	set_uuid[16];	/* user-space generated. */
+	char	set_name[32];	/* set and interpreted by user-space */
+
+	__le64	ctime;		/* lo 40 bits are seconds, top 24 are microseconds or 0*/
+	__le32	level;		/* -4 (multipath), -1 (linear), 0,1,4,5 */
+	__le32	layout;		/* only for raid5 and raid10 currently */
+	__le64	size;		/* used size of component devices, in 512byte sectors */
+
+	__le32	chunksize;	/* in 512byte sectors */
+	__le32	raid_disks;
+	__le32	bitmap_offset;	/* sectors after start of superblock that bitmap starts
+				 * NOTE: signed, so bitmap can be before superblock
+				 * only meaningful of feature_map[0] is set.
+				 */
+
+	/* These are only valid with feature bit '4' */
+	__le32	new_level;	/* new level we are reshaping to		*/
+	__le64	reshape_position;	/* next address in array-space for reshape */
+	__le32	delta_disks;	/* change in number of raid_disks		*/
+	__le32	new_layout;	/* new layout					*/
+	__le32	new_chunk;	/* new chunk size (512byte sectors)		*/
+	__le32  new_offset;	/* signed number to add to data_offset in new
+				 * layout.  0 == no-change.  This can be
+				 * different on each device in the array.
+				 */
+
+	/* constant this-device information - 64 bytes */
+	__le64	data_offset;	/* sector start of data, often 0 */
+	__le64	data_size;	/* sectors in this device that can be used for data */
+	__le64	super_offset;	/* sector start of this superblock */
+	__le64	recovery_offset;/* sectors before this offset (from data_offset) have been recovered */
+	__le32	dev_number;	/* permanent identifier of this  device - not role in raid */
+	__le32	cnt_corrected_read; /* number of read errors that were corrected by re-writing */
+	__u8	device_uuid[16]; /* user-space setable, ignored by kernel */
+	__u8	devflags;	/* per-device flags.  Only one defined...*/
+#define	WriteMostly1	1	/* mask for writemostly flag in above */
+	/* Bad block log.  If there are any bad blocks the feature flag is set.
+	 * If offset and size are non-zero, that space is reserved and available
+	 */
+	__u8	bblog_shift;	/* shift from sectors to block size */
+	__le16	bblog_size;	/* number of sectors reserved for list */
+	__le32	bblog_offset;	/* sector offset from superblock to bblog,
+				 * signed - not unsigned */
+
+	/* array state information - 64 bytes */
+	__le64	utime;		/* 40 bits second, 24 bits microseconds */
+	__le64	events;		/* incremented when superblock updated */
+	__le64	resync_offset;	/* data before this offset (from data_offset) known to be in sync */
+	__le32	sb_csum;	/* checksum up to devs[max_dev] */
+	__le32	max_dev;	/* size of devs[] array to consider */
+	__u8	pad3[64-32];	/* set to 0 when writing */
+
+	/* device state information. Indexed by dev_number.
+	 * 2 bytes per device
+	 * Note there are no per-device state flags. State information is rolled
+	 * into the 'roles' value.  If a device is spare or faulty, then it doesn't
+	 * have a meaningful role.
+	 */
+	__le16	dev_roles[0];	/* role in array, or 0xffff for a spare, or 0xfffe for faulty */
+};
+
+/* feature_map bits */
+#define MD_FEATURE_BITMAP_OFFSET	1
+#define	MD_FEATURE_RECOVERY_OFFSET	2 /* recovery_offset is present and
+					   * must be honoured
+					   */
+#define	MD_FEATURE_RESHAPE_ACTIVE	4
+#define	MD_FEATURE_BAD_BLOCKS		8 /* badblock list is not empty */
+#define	MD_FEATURE_REPLACEMENT		16 /* This device is replacing an
+					    * active device with same 'role'.
+					    * 'recovery_offset' is also set.
+					    */
+#define	MD_FEATURE_RESHAPE_BACKWARDS	32 /* Reshape doesn't change number
+					    * of devices, but is going
+					    * backwards anyway.
+					    */
+#define	MD_FEATURE_NEW_OFFSET		64 /* new_offset must be honoured */
+#define	MD_FEATURE_ALL			(MD_FEATURE_BITMAP_OFFSET	\
+					|MD_FEATURE_RECOVERY_OFFSET	\
+					|MD_FEATURE_RESHAPE_ACTIVE	\
+					|MD_FEATURE_BAD_BLOCKS		\
+					|MD_FEATURE_REPLACEMENT		\
+					|MD_FEATURE_RESHAPE_BACKWARDS	\
+					|MD_FEATURE_NEW_OFFSET		\
+					)
+
+#endif 

include/uapi/linux/raid/md_u.h

+/*
+   md_u.h : user <=> kernel API between Linux raidtools and RAID drivers
+          Copyright (C) 1998 Ingo Molnar
+	  
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+   
+   You should have received a copy of the GNU General Public License
+   (for example /usr/src/linux/COPYING); if not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  
+*/
+
+#ifndef _UAPI_MD_U_H
+#define _UAPI_MD_U_H
+
+/*
+ * Different major versions are not compatible.
+ * Different minor versions are only downward compatible.
+ * Different patchlevel versions are downward and upward compatible.
+ */
+#define MD_MAJOR_VERSION                0
+#define MD_MINOR_VERSION                90
+/*
+ * MD_PATCHLEVEL_VERSION indicates kernel functionality.
+ * >=1 means different superblock formats are selectable using SET_ARRAY_INFO
+ *     and major_version/minor_version accordingly
+ * >=2 means that Internal bitmaps are supported by setting MD_SB_BITMAP_PRESENT
+ *     in the super status byte
+ * >=3 means that bitmap superblock version 4 is supported, which uses
+ *     little-ending representation rather than host-endian
+ */
+#define MD_PATCHLEVEL_VERSION           3
+
+/* ioctls */
+
+/* status */
+#define RAID_VERSION		_IOR (MD_MAJOR, 0x10, mdu_version_t)
+#define GET_ARRAY_INFO		_IOR (MD_MAJOR, 0x11, mdu_array_info_t)
+#define GET_DISK_INFO		_IOR (MD_MAJOR, 0x12, mdu_disk_info_t)
+#define PRINT_RAID_DEBUG	_IO (MD_MAJOR, 0x13)
+#define RAID_AUTORUN		_IO (MD_MAJOR, 0x14)
+#define GET_BITMAP_FILE		_IOR (MD_MAJOR, 0x15, mdu_bitmap_file_t)
+
+/* configuration */
+#define CLEAR_ARRAY		_IO (MD_MAJOR, 0x20)
+#define ADD_NEW_DISK		_IOW (MD_MAJOR, 0x21, mdu_disk_info_t)
+#define HOT_REMOVE_DISK		_IO (MD_MAJOR, 0x22)
+#define SET_ARRAY_INFO		_IOW (MD_MAJOR, 0x23, mdu_array_info_t)
+#define SET_DISK_INFO		_IO (MD_MAJOR, 0x24)
+#define WRITE_RAID_INFO		_IO (MD_MAJOR, 0x25)
+#define UNPROTECT_ARRAY		_IO (MD_MAJOR, 0x26)
+#define PROTECT_ARRAY		_IO (MD_MAJOR, 0x27)
+#define HOT_ADD_DISK		_IO (MD_MAJOR, 0x28)
+#define SET_DISK_FAULTY		_IO (MD_MAJOR, 0x29)
+#define HOT_GENERATE_ERROR	_IO (MD_MAJOR, 0x2a)
+#define SET_BITMAP_FILE		_IOW (MD_MAJOR, 0x2b, int)
+
+/* usage */
+#define RUN_ARRAY		_IOW (MD_MAJOR, 0x30, mdu_param_t)
+/*  0x31 was START_ARRAY  */
+#define STOP_ARRAY		_IO (MD_MAJOR, 0x32)
+#define STOP_ARRAY_RO		_IO (MD_MAJOR, 0x33)
+#define RESTART_ARRAY_RW	_IO (MD_MAJOR, 0x34)
+
+/* 63 partitions with the alternate major number (mdp) */
+#define MdpMinorShift 6
+
+typedef struct mdu_version_s {
+	int major;
+	int minor;
+	int patchlevel;
+} mdu_version_t;
+
+typedef struct mdu_array_info_s {
+	/*
+	 * Generic constant information
+	 */
+	int major_version;
+	int minor_version;
+	int patch_version;
+	int ctime;
+	int level;
+	int size;
+	int nr_disks;
+	int raid_disks;
+	int md_minor;
+	int not_persistent;
+
+	/*
+	 * Generic state information
+	 */
+	int utime;		/*  0 Superblock update time		      */
+	int state;		/*  1 State bits (clean, ...)		      */
+	int active_disks;	/*  2 Number of currently active disks	      */
+	int working_disks;	/*  3 Number of working disks		      */
+	int failed_disks;	/*  4 Number of failed disks		      */
+	int spare_disks;	/*  5 Number of spare disks		      */
+
+	/*
+	 * Personality information
+	 */
+	int layout;		/*  0 the array's physical layout	      */
+	int chunk_size;	/*  1 chunk size in bytes		      */
+
+} mdu_array_info_t;
+
+/* non-obvious values for 'level' */
+#define	LEVEL_MULTIPATH		(-4)
+#define	LEVEL_LINEAR		(-1)
+#define	LEVEL_FAULTY		(-5)
+
+/* we need a value for 'no level specified' and 0
+ * means 'raid0', so we need something else.  This is
+ * for internal use only
+ */
+#define	LEVEL_NONE		(-1000000)
+
+typedef struct mdu_disk_info_s {
+	/*
+	 * configuration/status of one particular disk
+	 */
+	int number;
+	int major;
+	int minor;
+	int raid_disk;
+	int state;
+
+} mdu_disk_info_t;
+
+typedef struct mdu_start_info_s {
+	/*
+	 * configuration/status of one particular disk
+	 */
+	int major;
+	int minor;
+	int raid_disk;
+	int state;
+
+} mdu_start_info_t;
+
+typedef struct mdu_bitmap_file_s
+{
+	char pathname[4096];
+} mdu_bitmap_file_t;
+
+typedef struct mdu_param_s
+{
+	int			personality;	/* 1,2,3,4 */
+	int			chunk_size;	/* in bytes */
+	int			max_fault;	/* unused for now */
+} mdu_param_t;
+
+#endif /* _UAPI_MD_U_H */