linux/raid/md_p.h

1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
4           Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
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.
40  *	y = (x & ~(MD_RESERVED_BYTES - 1)) - MD_RESERVED_BYTES
47 #define MD_NEW_SIZE_SECTORS(x)		((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
54  * The following are counted in 32-bit words
68 #define MD_SB_RESERVED_WORDS		(1024 - MD_SB_GENERIC_WORDS - MD_SB_PERSONALITY_WORDS - MD_SB_DISKS_W…
74 #define MD_DISK_FAULTY		0 /* disk is faulty / operational */
75 #define MD_DISK_ACTIVE		1 /* disk is running or spare disk */
76 #define MD_DISK_SYNC		2 /* disk is in sync with the raid set */
77 #define MD_DISK_REMOVED		3 /* disk is in sync with the raid set */
78 #define MD_DISK_CLUSTER_ADD     4 /* Initiate a disk add across the cluster
81 #define MD_DISK_CANDIDATE	5 /* disk is added as spare (local) until confirmed
85 				    * devices available - and don't try to
89 #define	MD_DISK_WRITEMOSTLY	9 /* disk is "write-mostly" is RAID1 config.
93 #define MD_DISK_JOURNAL		18 /* disk is used as the write journal in RAID-5/6 */
98 #define MD_DISK_ROLE_MAX	0xff00 /* max value of regular disk role */
106 	__u32 reserved[MD_SB_DESCRIPTOR_WORDS - 5];
122  * - if an array is being reshaped (restriped) in order to change
125  *   be the "new - old".  So if +ve, raid_disks is the new value, and
126  *   "raid_disks-delta_disks" is the old.  If -ve, raid_disks is the
143 	__u32 size;		/*  8 Apparent size of each individual disk   */
151 	__u32 gstate_creserved[MD_SB_GENERIC_CONSTANT_WORDS - 16];
164 	__u32 events_hi;	/*  7 high-order of superblock update count   */
165 	__u32 events_lo;	/*  8 low-order of superblock update count    */
166 	__u32 cp_events_hi;	/*  9 high-order of checkpoint update count   */
167 	__u32 cp_events_lo;	/* 10 low-order of checkpoint update count    */
169 	__u32 events_lo;	/*  7 low-order of superblock update count    */
170 	__u32 events_hi;	/*  8 high-order of superblock update count   */
171 	__u32 cp_events_lo;	/*  9 low-order of checkpoint update count    */
172 	__u32 cp_events_hi;	/* 10 high-order of checkpoint update count   */
178 	__u64 reshape_position;	/* 12,13 next address in array-space for reshape */
183 	__u32 gstate_sreserved[MD_SB_GENERIC_STATE_WORDS - 18];
192 	__u32 pstate_reserved[MD_SB_PERSONALITY_WORDS - 4];
212 	__u64 ev = sb->events_hi;  in md_event()
213 	return (ev<<32)| sb->events_lo;  in md_event()
216 #define MD_SUPERBLOCK_1_TIME_SEC_MASK ((1ULL<<40) - 1)
219  * The version-1 superblock :
220  * All numeric fields are little-endian.
226 	/* constant array information - 128 bytes */
227 	__le32	magic;		/* MD_SB_MAGIC: 0xa92b4efc - little endian */
232 	__u8	set_uuid[16];	/* user-space generated. */
233 	char	set_name[32];	/* set and interpreted by user-space */
236 	__le32	level;		/* 0,1,4,5, -1 (linear) */
257 	__le64	reshape_position;	/* next address in array-space for reshape */
261 	__le32  new_offset;	/* signed number to add to data_offset in new
262 				 * layout.  0 == no-change.  This can be
266 	/* constant this-device information - 64 bytes */
274 	__le32	dev_number;	/* permanent identifier of this  device - not role in raid */
275 	__le32	cnt_corrected_read; /* number of read errors that were corrected by re-writing */
276 	__u8	device_uuid[16]; /* user-space setable, ignored by kernel */
277 	__u8	devflags;	/* per-device flags.  Only two defined...*/
281 	 * If offset and size are non-zero, that space is reserved and available
286 				 * signed - not unsigned */
288 	/* array state information - 64 bytes */
294 	__u8	pad3[64-32];	/* set to 0 when writing */
298 	 * Note there are no per-device state flags. State information is rolled
396 	__le64 position; /* sector, start from rdev->data_offset, current position */
407 	__le32 parity_disk;	/* member disk containing parity */
415 	(PPL_HEADER_SIZE - PPL_HDR_RESERVED - 4 * sizeof(__le32) - sizeof(__le64))