Re: [PATCH] xfs: Don't trim file extents during iomap

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On Tue, Nov 28, 2017 at 06:30:34PM -0800, Darrick J. Wong wrote:
> Hey Christoph, what are the rules about ->iomap_begin passing back an
> extent that extends outside the range that was requested?  Mr. Borisov
> wants XFS fiemap to return the raw extent without trimming (apparently
> to follow the ext4 fiemap behavior), but enabling XFS_BMAPI_ENTIRE
> unconditionally causes xfstests regressions, which we cannot have.

No rules yet as you see.  But I think the best plan in the long run
is that the iomap.c code will trim any mapping if needed instead of having
duplicate instance of the trimming code in the file systems.
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