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, 2 insertions, 7 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 8345d6d3436a..182b21825255 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2791,13 +2791,8 @@ ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
                 ret = __generic_file_write_iter(iocb, from);
         inode_unlock(inode);
 
-        if (ret > 0) {
-                ssize_t err;
-
-                err = generic_write_sync(iocb, iocb->ki_pos - ret, ret);
-                if (err < 0)
-                        ret = err;
-        }
+        if (ret > 0)
+                ret = generic_write_sync(iocb, ret);
         return ret;
 }
 EXPORT_SYMBOL(generic_file_write_iter);