readahead: disentangle async and sync readahead

Both async and sync readahead are handled by ondemand_readahead()
function.  However there isn't actually much in common.  Just move async
related parts into page_cache_ra_async() and sync related parts to
page_cache_ra_sync().  No functional changes.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Jan Kara <[email protected]>
Reviewed-by: Josef Bacik <[email protected]>
Tested-by: Zhang Peng <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions