fs: simplify the generic_write_sync prototype

The kiocb already has the new position, so use that.  The only interesting
case is AIO, where we currently don't bother updating ki_pos.  We're about
to free the kiocb after we're done, so we might as well update it to make
everyone's life simpler.

While we're at it also return the bytes written argument passed in if
we were successful so that the boilerplate error switch code in the
callers can go away.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index be86de9a77d7..0b9fca040b0c 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -1054,7 +1054,9 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
                         if (i_size_read(inode) < iocb->ki_pos)
                                 i_size_write(inode, iocb->ki_pos);
                         spin_unlock(&inode->i_lock);
-                        generic_write_sync(iocb, pos, result);
+
+                        /* XXX: should check the generic_write_sync retval */
+                        generic_write_sync(iocb, result);
                 }
         }
         nfs_direct_req_release(dreq);