NFS: create common routine for waiting for direct I/O to complete
We're about to add asynchrony to the NFS direct write path. Begin by abstracting out the common pieces in the read path. The first piece is nfs_direct_read_wait, which works the same whether the process is waiting for a read or a write. Test plan: Compile kernel with CONFIG_NFS and CONFIG_NFS_DIRECTIO enabled. Signed-off-by: NChuck Lever <cel@netapp.com> Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>
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