NFS: Always enable NFS direct I/O

Since O_DIRECT is a standard feature that is enabled in most distros,
eliminate the CONFIG_NFS_DIRECTIO build option, and change the
fs/nfs/Makefile to always build in the NFS direct I/O engine.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index ef57a5ae5904..10e8b807e7ff 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -234,10 +234,8 @@ nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
         ssize_t result;
         size_t count = iov_length(iov, nr_segs);
 
-#ifdef CONFIG_NFS_DIRECTIO
         if (iocb->ki_filp->f_flags & O_DIRECT)
                 return nfs_file_direct_read(iocb, iov, nr_segs, pos);
-#endif
 
         dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n",
                 dentry->d_parent->d_name.name, dentry->d_name.name,
@@ -383,9 +381,7 @@ const struct address_space_operations nfs_file_aops = {
         .write_end = nfs_write_end,
         .invalidatepage = nfs_invalidate_page,
         .releasepage = nfs_release_page,
-#ifdef CONFIG_NFS_DIRECTIO
         .direct_IO = nfs_direct_IO,
-#endif
         .launder_page = nfs_launder_page,
 };
 
@@ -443,10 +439,8 @@ static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
         ssize_t result;
         size_t count = iov_length(iov, nr_segs);
 
-#ifdef CONFIG_NFS_DIRECTIO
         if (iocb->ki_filp->f_flags & O_DIRECT)
                 return nfs_file_direct_write(iocb, iov, nr_segs, pos);
-#endif
 
         dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%Ld)\n",
                 dentry->d_parent->d_name.name, dentry->d_name.name,