tree 29488639a0421bfd6316beb79131630d43039009
parent 486aff5e04823bb1e60c4045226eb244024b8420
author Dan Williams <dan.j.williams@intel.com> 1504111414 -0700
committer Dan Williams <dan.j.williams@intel.com> 1504197210 -0700

ext2: perform dax_device lookup at mount

The ->iomap_begin() operation is a hot path, so cache the
fs_dax_get_by_host() result at mount time to avoid the incurring the
hash lookup overhead on a per-i/o basis.

Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Reviewed-by: Jan Kara <jack@suse.cz>
Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>