fs: add FMODE_BUF_RASYNC

If set, this indicates that the file system supports IOCB_WAITQ for
buffered reads.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-05-22 09:12:51 -06:00
commit c2a25ec0f1