xfs: refactor dir2 leaf readahead shadow buffer cleverness

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Currently, the dir2 leaf block getdents function uses a complex state
tracking mechanism to create a shadow copy of the block mappings and
then uses the shadow copy to schedule readahead.  Since the read and
readahead functions are perfectly capable of reading the mappings
themselves, we can tear all that out in favor of a simpler function that
simply keeps pushing the readahead window further out.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

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Darrick J. Wong 2017-06-14 21:23:05 -07:00

parent 7912e7fef2

commit d205a7d0ec

1 changed files with 84 additions and 234 deletions

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fs/xfs/xfs_dir2_readdir.c

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