• Dan Williams's avatar
    block, dax: move "select DAX" from BLOCK to FS_DAX · ef510424
    Dan Williams authored
    For configurations that do not enable DAX filesystems or drivers, do not
    require the DAX core to be built.
    Given that the 'direct_access' method has been removed from
    'block_device_operations', we can also go ahead and remove the
    block-related dax helper functions from fs/block_dev.c to
    drivers/dax/super.c. This keeps dax details out of the block layer and
    lets the DAX core be built as a module in the FS_DAX=n case.
    Filesystems need to include dax.h to call bdev_dax_supported().
    Cc: linux-xfs@vger.kernel.org
    Cc: Jens Axboe <axboe@kernel.dk>
    Cc: "Theodore Ts'o" <tytso@mit.edu>
    Cc: Matthew Wilcox <mawilcox@microsoft.com>
    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
    Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
    Reviewed-by: default avatarJan Kara <jack@suse.com>
    Reported-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
    Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
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