[thirdparty/mdadm.git] / 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

/*
 * 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_RESERVED_BLOCKS		(MD_RESERVED_BYTES / BLOCK_SIZE)

#define MD_NEW_SIZE_SECTORS(x)		((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
#define MD_NEW_SIZE_BLOCKS(x)		((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS)

#define MD_SB_BYTES			4096
#define MD_SB_WORDS			(MD_SB_BYTES / 4)
#define MD_SB_BLOCKS			(MD_SB_BYTES / BLOCK_SIZE)
#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 but may not be in sync */
#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_CLUSTER_ADD	4 /* Initiate a disk add across the cluster
				   * For clustered enviroments only.
				   */
#define MD_DISK_CANDIDATE	5 /* disk is added as spare (local) until confirmed
				   * For clustered enviroments only.
				   */

#define	MD_DISK_WRITEMOSTLY	9 /* disk is "write-mostly" is RAID1 config.
				   * read requests will only be sent here in
				   * dire need
				   */
#define	MD_DISK_FAILFAST	10 /* Fewer retries, more failures */

#define MD_DISK_REPLACEMENT	17
#define MD_DISK_JOURNAL		18 /* disk is used as the write journal in RAID-5/6 */

#define MD_DISK_ROLE_SPARE	0xffff
#define MD_DISK_ROLE_FAULTY	0xfffe
#define MD_DISK_ROLE_JOURNAL	0xfffd
#define MD_DISK_ROLE_MAX	0xff00 /* max value of regular disk role */

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_BBM_ERRORS	2
#define MD_SB_BLOCK_CONTAINER_RESHAPE 3 /* block container wide reshapes */
#define MD_SB_BLOCK_VOLUME	4 /* block activation of array, other arrays
				   * in container can be activated */
#define MD_SB_CLUSTERED		5 /* MD is clustered  */
#define	MD_SB_BITMAP_PRESENT	8 /* bitmap may be present nearby */

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        */
#if  __BYTE_ORDER ==  __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;

#ifdef __TINYC__
typedef unsigned long long __u64;
#endif

static inline __u64 md_event(mdp_super_t *sb) {
	__u64 ev = sb->events_hi;
	return (ev<<32)| sb->events_lo;
}

struct r5l_payload_header {
	__u16 type;
	__u16 flags;
} __attribute__ ((__packed__));

enum r5l_payload_type {
	R5LOG_PAYLOAD_DATA = 0,
	R5LOG_PAYLOAD_PARITY = 1,
	R5LOG_PAYLOAD_FLUSH = 2,
};

struct r5l_payload_data_parity {
	struct r5l_payload_header header;
	__u32 size; /* sector. data/parity size. each 4k has a checksum */
	__u64 location; /* sector. For data, it's raid sector. For
				parity, it's stripe sector */
	__u32 checksum[];
} __attribute__ ((__packed__));

enum r5l_payload_data_parity_flag {
	R5LOG_PAYLOAD_FLAG_DISCARD = 1, /* payload is discard */
	/*
	 * RESHAPED/RESHAPING is only set when there is reshape activity. Note,
	 * both data/parity of a stripe should have the same flag set
	 *
	 * RESHAPED: reshape is running, and this stripe finished reshape
	 * RESHAPING: reshape is running, and this stripe isn't reshaped
	 * */
	R5LOG_PAYLOAD_FLAG_RESHAPED = 2,
	R5LOG_PAYLOAD_FLAG_RESHAPING = 3,
};

struct r5l_payload_flush {
	struct r5l_payload_header header;
	__u32 size; /* flush_stripes size, bytes */
	__u64 flush_stripes[];
} __attribute__ ((__packed__));

enum r5l_payload_flush_flag {
	R5LOG_PAYLOAD_FLAG_FLUSH_STRIPE = 1, /* data represents whole stripe */
};

struct r5l_meta_block {
	__u32 magic;
	__u32 checksum;
	__u8 version;
	__u8 __zero_pading_1;
	__u16 __zero_pading_2;
	__u32 meta_size; /* whole size of the block */

	__u64 seq;
	__u64 position; /* sector, start from rdev->data_offset, current position */
	struct r5l_payload_header payloads[];
} __attribute__ ((__packed__));

#define R5LOG_VERSION 0x1
#define R5LOG_MAGIC 0x6433c509

#endif
Commit	Line	Data
64c4757e NB	1	/*
	2	md_p.h : physical layout of Linux RAID devices
	3	Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
aba69144	4
64c4757e NB	5	This program is free software; you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation; either version 2, or (at your option)
	8	any later version.
aba69144	9
64c4757e NB	10	You should have received a copy of the GNU General Public License
64c4757e NB	11	(for example /usr/src/linux/COPYING); if not, write to the Free
aba69144	12	Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
64c4757e NB	13	*/
	14
	15	#ifndef _MD_P_H
	16	#define _MD_P_H
	17
	18	/*
	19	* RAID superblock.
	20	*
	21	* The RAID superblock maintains some statistics on each RAID configuration.
	22	* Each real device in the RAID set contains it near the end of the device.
	23	* Some of the ideas are copied from the ext2fs implementation.
	24	*
	25	* We currently use 4096 bytes as follows:
	26	*
	27	* word offset function
	28	*
	29	* 0 - 31 Constant generic RAID device information.
	30	* 32 - 63 Generic state information.
	31	* 64 - 127 Personality specific information.
	32	* 128 - 511 12 32-words descriptors of the disks in the raid set.
	33	* 512 - 911 Reserved.
	34	* 912 - 1023 Disk specific descriptor.
	35	*/
	36
	37	/*
	38	* If x is the real device size in bytes, we return an apparent size of:
	39	*
	40	* y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES
	41	*
	42	* and place the 4kB superblock at offset y.
	43	*/
	44	#define MD_RESERVED_BYTES (64 * 1024)
	45	#define MD_RESERVED_SECTORS (MD_RESERVED_BYTES / 512)
	46	#define MD_RESERVED_BLOCKS (MD_RESERVED_BYTES / BLOCK_SIZE)
	47
	48	#define MD_NEW_SIZE_SECTORS(x) ((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
	49	#define MD_NEW_SIZE_BLOCKS(x) ((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS)
	50
	51	#define MD_SB_BYTES 4096
	52	#define MD_SB_WORDS (MD_SB_BYTES / 4)
	53	#define MD_SB_BLOCKS (MD_SB_BYTES / BLOCK_SIZE)
	54	#define MD_SB_SECTORS (MD_SB_BYTES / 512)
	55
	56	/*
	57	* The following are counted in 32-bit words
	58	*/
	59	#define MD_SB_GENERIC_OFFSET 0
	60	#define MD_SB_PERSONALITY_OFFSET 64
	61	#define MD_SB_DISKS_OFFSET 128
	62	#define MD_SB_DESCRIPTOR_OFFSET 992
	63
	64	#define MD_SB_GENERIC_CONSTANT_WORDS 32
	65	#define MD_SB_GENERIC_STATE_WORDS 32
	66	#define MD_SB_GENERIC_WORDS (MD_SB_GENERIC_CONSTANT_WORDS + MD_SB_GENERIC_STATE_WORDS)
	67	#define MD_SB_PERSONALITY_WORDS 64
	68	#define MD_SB_DESCRIPTOR_WORDS 32
	69	#define MD_SB_DISKS 27
	70	#define MD_SB_DISKS_WORDS (MD_SB_DISKS*MD_SB_DESCRIPTOR_WORDS)
	71	#define MD_SB_RESERVED_WORDS (1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_WORDS - MD_SB_DESCRIPTOR_WORDS)
	72	#define MD_SB_EQUAL_WORDS (MD_SB_GENERIC_WORDS + MD_SB_PERSONALITY_WORDS + MD_SB_DISKS_WORDS)
	73
	74	/*
	75	* Device "operational" state bits
	76	*/
77	#define MD_DISK_FAULTY 0 /* disk is faulty / operational */
f22385f9	78	#define MD_DISK_ACTIVE 1 /* disk is running but may not be in sync */
64c4757e NB	79	#define MD_DISK_SYNC 2 /* disk is in sync with the raid set */
64c4757e NB	80	#define MD_DISK_REMOVED 3 /* disk is in sync with the raid set */
4de90913 GJ	81	#define MD_DISK_CLUSTER_ADD 4 /* Initiate a disk add across the cluster
	82	* For clustered enviroments only.
	83	*/
	84	#define MD_DISK_CANDIDATE 5 /* disk is added as spare (local) until confirmed
	85	* For clustered enviroments only.
	86	*/
64c4757e	87
dfd4d8ee	88	#define MD_DISK_WRITEMOSTLY 9 /* disk is "write-mostly" is RAID1 config.
aba69144	89	* read requests will only be sent here in
dfd4d8ee NB	90	* dire need
dfd4d8ee NB	91	*/
71574efb	92	#define MD_DISK_FAILFAST 10 /* Fewer retries, more failures */
dfd4d8ee	93
aacb2f81	94	#define MD_DISK_REPLACEMENT 17
ed94976d	95	#define MD_DISK_JOURNAL 18 /* disk is used as the write journal in RAID-5/6 */
aacb2f81	96
fa7574f6 SL	97	#define MD_DISK_ROLE_SPARE 0xffff
fa7574f6 SL	98	#define MD_DISK_ROLE_FAULTY 0xfffe
ed94976d	99	#define MD_DISK_ROLE_JOURNAL 0xfffd
fa7574f6 SL	100	#define MD_DISK_ROLE_MAX 0xff00 /* max value of regular disk role */
fa7574f6 SL	101
64c4757e NB	102	typedef struct mdp_device_descriptor_s {
	103	__u32 number; /* 0 Device number in the entire set */
	104	__u32 major; /* 1 Device major number */
	105	__u32 minor; /* 2 Device minor number */
	106	__u32 raid_disk; /* 3 The role of the device in the raid set */
	107	__u32 state; /* 4 Operational state */
	108	__u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5];
	109	} mdp_disk_t;
	110
	111	#define MD_SB_MAGIC 0xa92b4efc
	112
	113	/*
	114	* Superblock state bits
	115	*/
	116	#define MD_SB_CLEAN 0
	117	#define MD_SB_ERRORS 1
a06d022d	118	#define MD_SB_BBM_ERRORS 2
81219e70 LM	119	#define MD_SB_BLOCK_CONTAINER_RESHAPE 3 /* block container wide reshapes */
	120	#define MD_SB_BLOCK_VOLUME 4 /* block activation of array, other arrays
	121	* in container can be activated */
4de90913	122	#define MD_SB_CLUSTERED 5 /* MD is clustered */
55935d51 NB	123	#define MD_SB_BITMAP_PRESENT 8 /* bitmap may be present nearby */
55935d51 NB	124
64c4757e NB	125	typedef struct mdp_superblock_s {
	126	/*
	127	* Constant generic information
	128	*/
1011e834	129	__u32 md_magic; /* 0 MD identifier */
64c4757e NB	130	__u32 major_version; /* 1 major version to which the set conforms */
	131	__u32 minor_version; /* 2 minor version ... */
	132	__u32 patch_version; /* 3 patchlevel version ... */
	133	__u32 gvalid_words; /* 4 Number of used words in this section */
	134	__u32 set_uuid0; /* 5 Raid set identifier */
	135	__u32 ctime; /* 6 Creation time */
	136	__u32 level; /* 7 Raid personality */
	137	__u32 size; /* 8 Apparent size of each individual disk */
	138	__u32 nr_disks; /* 9 total disks in the raid set */
	139	__u32 raid_disks; /* 10 disks in a fully functional raid set */
	140	__u32 md_minor; /* 11 preferred MD minor device number */
	141	__u32 not_persistent; /* 12 does it have a persistent superblock */
	142	__u32 set_uuid1; /* 13 Raid set identifier #2 */
	143	__u32 set_uuid2; /* 14 Raid set identifier #3 */
	144	__u32 set_uuid3; /* 15 Raid set identifier #4 */
	145	__u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 16];
	146
	147	/*
	148	* Generic state information
	149	*/
	150	__u32 utime; /* 0 Superblock update time */
	151	__u32 state; /* 1 State bits (clean, ...) */
	152	__u32 active_disks; /* 2 Number of currently active disks */
	153	__u32 working_disks; /* 3 Number of working disks */
	154	__u32 failed_disks; /* 4 Number of failed disks */
	155	__u32 spare_disks; /* 5 Number of spare disks */
	156	__u32 sb_csum; /* 6 checksum of the whole superblock */
52826846	157	#if __BYTE_ORDER == __BIG_ENDIAN
64c4757e NB	158	__u32 events_hi; /* 7 high-order of superblock update count */
64c4757e NB	159	__u32 events_lo; /* 8 low-order of superblock update count */
e5329c37 NB	160	__u32 cp_events_hi; /* 9 high-order of checkpoint update count */
e5329c37 NB	161	__u32 cp_events_lo; /* 10 low-order of checkpoint update count */
64c4757e NB	162	#else
	163	__u32 events_lo; /* 7 low-order of superblock update count */
	164	__u32 events_hi; /* 8 high-order of superblock update count */
e5329c37 NB	165	__u32 cp_events_lo; /* 9 low-order of checkpoint update count */
e5329c37 NB	166	__u32 cp_events_hi; /* 10 high-order of checkpoint update count */
64c4757e	167	#endif
e5329c37	168	__u32 recovery_cp; /* 11 recovery checkpoint sector count */
b674b5b8 NB	169	/* There are only valid for minor_version > 90 */
	170	__u64 reshape_position; /* 12,13 next address in array-space for reshape */
	171	__u32 new_level; /* 14 new level we are reshaping to */
	172	__u32 delta_disks; /* 15 change in number of raid_disks */
	173	__u32 new_layout; /* 16 new layout */
	174	__u32 new_chunk; /* 17 new chunk size (bytes) */
	175	__u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 18];
64c4757e NB	176
	177	/*
	178	* Personality information
	179	*/
	180	__u32 layout; /* 0 the array's physical layout */
	181	__u32 chunk_size; /* 1 chunk size in bytes */
	182	__u32 root_pv; /* 2 LV root PV */
	183	__u32 root_block; /* 3 LV root block */
	184	__u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 4];
	185
	186	/*
	187	* Disks information
	188	*/
	189	mdp_disk_t disks[MD_SB_DISKS];
	190
	191	/*
	192	* Reserved
	193	*/
	194	__u32 reserved[MD_SB_RESERVED_WORDS];
	195
	196	/*
	197	* Active descriptor
	198	*/
	199	mdp_disk_t this_disk;
	200
	201	} mdp_super_t;
	202
5787fa49 NB	203	#ifdef __TINYC__
	204	typedef unsigned long long __u64;
	205	#endif
	206
64c4757e NB	207	static inline __u64 md_event(mdp_super_t *sb) {
	208	__u64 ev = sb->events_hi;
	209	return (ev<<32)\| sb->events_lo;
	210	}
	211
cc1799c3 SL	212	struct r5l_payload_header {
	213	__u16 type;
	214	__u16 flags;
	215	} __attribute__ ((__packed__));
	216
	217	enum r5l_payload_type {
	218	R5LOG_PAYLOAD_DATA = 0,
	219	R5LOG_PAYLOAD_PARITY = 1,
	220	R5LOG_PAYLOAD_FLUSH = 2,
	221	};
	222
	223	struct r5l_payload_data_parity {
	224	struct r5l_payload_header header;
	225	__u32 size; /* sector. data/parity size. each 4k has a checksum */
	226	__u64 location; /* sector. For data, it's raid sector. For
	227	parity, it's stripe sector */
	228	__u32 checksum[];
	229	} __attribute__ ((__packed__));
	230
	231	enum r5l_payload_data_parity_flag {
	232	R5LOG_PAYLOAD_FLAG_DISCARD = 1, /* payload is discard */
	233	/*
	234	* RESHAPED/RESHAPING is only set when there is reshape activity. Note,
	235	* both data/parity of a stripe should have the same flag set
	236	*
	237	* RESHAPED: reshape is running, and this stripe finished reshape
	238	* RESHAPING: reshape is running, and this stripe isn't reshaped
	239	* */
	240	R5LOG_PAYLOAD_FLAG_RESHAPED = 2,
	241	R5LOG_PAYLOAD_FLAG_RESHAPING = 3,
	242	};
	243
	244	struct r5l_payload_flush {
	245	struct r5l_payload_header header;
	246	__u32 size; /* flush_stripes size, bytes */
	247	__u64 flush_stripes[];
	248	} __attribute__ ((__packed__));
	249
	250	enum r5l_payload_flush_flag {
	251	R5LOG_PAYLOAD_FLAG_FLUSH_STRIPE = 1, /* data represents whole stripe */
	252	};
	253
	254	struct r5l_meta_block {
	255	__u32 magic;
	256	__u32 checksum;
	257	__u8 version;
	258	__u8 __zero_pading_1;
	259	__u16 __zero_pading_2;
	260	__u32 meta_size; /* whole size of the block */
	261
	262	__u64 seq;
	263	__u64 position; /* sector, start from rdev->data_offset, current position */
	264	struct r5l_payload_header payloads[];
	265	} __attribute__ ((__packed__));
	266
	267	#define R5LOG_VERSION 0x1
	268	#define R5LOG_MAGIC 0x6433c509
	269
aba69144	270	#endif