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SubjectRe: Filling holes in ext2
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> 3) lock the pages corresponding to the user buffer so that 
> __copy_from_user() cannot fail.
>
> I like the latter option, as it removes this abort case for ext3 and
> could drastically simplify GFS.

Neat elegant and fundamentally close to impossible to implement without
deadlocks.

There only seems to be a problem if prepare_write fills in the metadata. In
such cases the fs I think does need to implement abort operations
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