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SubjectRe: [EXT4 set 4][PATCH 1/5] i_version:64 bit inode version

It just occurred to me:

If i_version is 64bit, then knfsd would need to be careful when
reading it on a 32bit host. What are the locking rules?

Presumably it is only updated under i_mutex protection, but having to
get i_mutex to read it would seem a little heavy handed.

Should it use a seqlock like i_size?
Could we use the same seqlock that i_size uses, or would we need a
separate one?

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