[PATCH] Remove DIO_OWN_LOCKING

[Russell Cattelan <cattelan@xxxxxxxxxxx>]

While trying to fix up GFS2 directio and reading through the code
involving the various lock flags I discovered the DIO_OWN_LOCKING 
flag is no longer used.
 
XFS recently changed it xfs_vm_direct_IO function to call
blockdev_direct_IO_no_locking for reads and
blockdev_direct_IO_own_locking
for writes. But DIO_OWN_LOCKING is only used in the direct IO read case
so effectively the flag is never checked an therefore can probably be
removed.

-- 
Russell Cattelan <cattelan@xxxxxxxxxxx>

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