Isn't this a miscount in md_p.h, in struct mdp_superblock_1:
...
__u8 pad2[64-56]; /* set to 0 when writing */
/* array state information - 64 bytes */
__u64 utime; /* 40 bits second, 24 btes microseconds */
__u64 events; /* incremented when superblock updated */
__u64 resync_offset; /* data before this offset (from data_offset) known to be in sync */
__u32 sb_csum; /* checksum upto devs[max_dev] */
__u32 max_dev; /* size of devs[] array to consider */
__u8 pad3[64-40]; /* set to 0 when writing */
I count 3 * 64b + 2 * 32b = 3 * 8B + 2 * 4B = 32B, not 40B, before the
padding for this section starts. It looks like somebody counted 5 * 64b
= 5 * 8B = 40B.
Peter
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