block: add some comments around the bio read-write flags
authorJens Axboe <jens.axboe@oracle.com>
Thu, 9 Oct 2008 07:01:10 +0000 (09:01 +0200)
committerJens Axboe <jens.axboe@oracle.com>
Thu, 9 Oct 2008 07:01:10 +0000 (09:01 +0200)
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

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