xfs: simplify xfs_file_iomap_begin() logic

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The current logic that determines whether allocation should be done
has grown somewhat spaghetti like with the addition of IOMAP_NOWAIT
functionality. Separate out each of the different cases into single,
obvious checks to get rid most of the nested IOMAP_NOWAIT checks
in the allocation logic.

Signed-Off-By: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

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Dave Chinner 2018-05-02 12:54:53 -07:00 • committed by Darrick J. Wong

parent 3460cac1ca

commit d064178094

1 changed files with 46 additions and 36 deletions

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fs/xfs/xfs_iomap.c

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