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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003
* Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
* Copyright (C) 2005 Neil Brown <neilb@suse.com>
*/
/* See documentation/bitmap.md */
#ifndef BITMAP_H
#define BITMAP_H 1
#define BITMAP_MAJOR_LO 3
#define BITMAP_MAJOR_HI 4
#define BITMAP_MAJOR_CLUSTERED 5
#define BITMAP_MAGIC 0x6d746962
/* use these for bitmap->flags and bitmap->sb->state bit-fields */
enum bitmap_state {
BITMAP_ACTIVE = 0x001, /* the bitmap is in use */
BITMAP_STALE = 0x002 /* the bitmap file is out of date or had -EIO */
};
/* the superblock at the front of the bitmap file -- little endian */
typedef struct bitmap_super_s {
__u32 magic; /* 0 BITMAP_MAGIC */
__u32 version; /* 4 the bitmap major for now, could change... */
__u8 uuid[16]; /* 8 128 bit uuid - must match md device uuid */
__u64 events; /* 24 event counter for the bitmap (1)*/
__u64 events_cleared;/*32 event counter when last bit cleared (2) */
__u64 sync_size; /* 40 the size of the md device's sync range(3) */
__u32 state; /* 48 bitmap state information */
__u32 chunksize; /* 52 the bitmap chunk size in bytes */
__u32 daemon_sleep; /* 56 seconds between disk flushes */
__u32 write_behind; /* 60 number of outstanding write-behind writes */
__u32 sectors_reserved; /* 64 number of 512-byte sectors that are
* reserved for the bitmap. */
__u32 nodes; /* 68 the maximum number of nodes in cluster. */
__u8 cluster_name[64]; /* 72 cluster name to which this md belongs */
__u8 pad[256 - 136]; /* set to zero */
} bitmap_super_t;
#endif
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