[PATCH v10 35/35] netfs: Clean up now-unused code

[David Howells <dhowells@redhat.com>]

Delete now-unused code from netfslib, given the changes to the writeback
dispatch code and the combination of ->prepare_xxx() and ->issue_xxx()
methods.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Paulo Alcantara <pc@manguebit.org>
cc: Matthew Wilcox <willy@infradead.org>
cc: Christoph Hellwig <hch@infradead.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
---
 fs/netfs/write_issue.c | 216 -----------------------------------------
 1 file changed, 216 deletions(-)

diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
index e0d14d77b751..961949689303 100644
--- a/fs/netfs/write_issue.c
+++ b/fs/netfs/write_issue.c
@@ -223,69 +223,6 @@ struct netfs_io_subrequest *netfs_alloc_write_subreq(struct netfs_io_request *wr
 	return subreq;
 }
 
-#if 0 // TODO: Remove old stuff
-/*
- * Prepare a write subrequest.  We need to allocate a new subrequest
- * if we don't have one.
- */
-void netfs_prepare_write(struct netfs_io_request *wreq,
-			 struct netfs_io_stream *stream,
-			 uoff_t start)
-{
-	struct netfs_io_subrequest *subreq;
-
-	subreq = netfs_alloc_subrequest(wreq);
-	subreq->source		= stream->source;
-	subreq->start		= start;
-	subreq->stream_nr	= stream->stream_nr;
-
-	bvecq_pos_set(&subreq->dispatch_pos, &wreq->dispatch_cursor);
-
-	_enter("R=%x[%x]", wreq->debug_id, subreq->debug_index);
-
-	trace_netfs_sreq(subreq, netfs_sreq_trace_prepare);
-
-	stream->sreq_max_len	= UINT_MAX;
-	stream->sreq_max_segs	= INT_MAX;
-	switch (stream->source) {
-	case NETFS_UPLOAD_TO_SERVER:
-		netfs_stat(&netfs_n_wh_upload);
-		stream->sreq_max_len = wreq->wsize;
-		break;
-	case NETFS_WRITE_TO_CACHE:
-		netfs_stat(&netfs_n_wh_write);
-		break;
-	default:
-		WARN_ON_ONCE(1);
-		break;
-	}
-
-	if (stream->prepare_write)
-		stream->prepare_write(subreq);
-
-	__set_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags);
-
-	/* We add to the end of the list whilst the collector may be walking
-	 * the list.  The collector only goes nextwards and uses the lock to
-	 * remove entries off of the front.
-	 */
-	spin_lock(&wreq->lock);
-	/* Write IN_PROGRESS before pointer to new subreq */
-	list_add_tail_release(&subreq->rreq_link, &stream->subrequests);
-	if (list_is_first(&subreq->rreq_link, &stream->subrequests)) {
-		if (!stream->active) {
-			stream->collected_to = subreq->start;
-			/* Write list pointers before active flag */
-			smp_store_release(&stream->active, true);
-		}
-	}
-
-	spin_unlock(&wreq->lock);
-
-	stream->construct = subreq;
-}
-#endif
-
 /*
  * Advance the state of the amount of data buffered on a stream.
  */
@@ -368,159 +305,6 @@ int netfs_prepare_write_buffer(struct netfs_io_subrequest *subreq,
 }
 EXPORT_SYMBOL(netfs_prepare_write_buffer);
 
-#if 0 // TODO: Remove old stuff
-/*
- * Set the I/O iterator for the filesystem/cache to use and dispatch the I/O
- * operation.  The operation may be asynchronous and should call
- * netfs_write_subrequest_terminated() when complete.
- */
-static void netfs_do_issue_write(struct netfs_io_stream *stream,
-				 struct netfs_io_subrequest *subreq)
-{
-	struct netfs_io_request *wreq = subreq->rreq;
-
-	_enter("R=%x[%x],%zx", wreq->debug_id, subreq->debug_index, subreq->len);
-
-	if (stream->source == NETFS_WRITE_TO_CACHE &&
-	    unlikely(test_bit(NETFS_RREQ_CACHE_STOP, &wreq->flags))) {
-		size_t dio_size = wreq->cache_resources.dio_size;
-		size_t len, disp;
-
-		disp = subreq->start & (dio_size - 1);
-		len = round_up(subreq->len + disp, dio_size);
-
-		subreq->start -= disp;
-		subreq->len = len;
-
-		__set_bit(NETFS_SREQ_CANCELLED, &subreq->flags);
-		return netfs_write_subrequest_terminated(subreq, subreq->len);
-	}
-
-	if (test_bit(NETFS_SREQ_FAILED, &subreq->flags))
-		return netfs_write_subrequest_terminated(subreq, subreq->error);
-
-	trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
-	stream->issue_write(subreq);
-}
-
-void netfs_reissue_write(struct netfs_io_stream *stream,
-			 struct netfs_io_subrequest *subreq)
-{
-	// TODO: Use encrypted buffer
-	bvecq_pos_unset(&subreq->content);
-	bvecq_pos_set(&subreq->content, &subreq->dispatch_pos);
-	iov_iter_bvec_queue(&subreq->io_iter, ITER_SOURCE,
-			    subreq->content.bvecq, subreq->content.slot,
-			    subreq->content.offset,
-			    subreq->len);
-	iov_iter_advance(&subreq->io_iter, subreq->transferred);
-
-	subreq->retry_count++;
-	subreq->error = 0;
-	__clear_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
-	__set_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags);
-	netfs_stat(&netfs_n_wh_retry_write_subreq);
-	netfs_do_issue_write(stream, subreq);
-}
-
-static void netfs_issue_write(struct netfs_io_request *wreq,
-			      struct netfs_io_stream *stream)
-{
-	struct netfs_io_subrequest *subreq = stream->construct;
-
-	if (!subreq)
-		return;
-
-	bvecq_pos_set(&subreq->content, &subreq->dispatch_pos);
-	iov_iter_bvec_queue(&subreq->io_iter, ITER_SOURCE,
-			    subreq->content.bvecq, subreq->content.slot,
-			    subreq->content.offset,
-			    subreq->len);
-
-	stream->construct = NULL;
-	netfs_do_issue_write(stream, subreq);
-}
-
-/*
- * Add data to the write subrequest, dispatching each as we fill it up or if it
- * is discontiguous with the previous.  We only fill one part at a time so that
- * we can avoid overrunning the credits obtained (cifs) and try to parallelise
- * content-crypto preparation with network writes.
- */
-size_t netfs_advance_write(struct netfs_io_request *wreq,
-			   struct netfs_io_stream *stream,
-			   uoff_t start, size_t len, bool to_eof)
-{
-	struct netfs_io_subrequest *subreq = stream->construct;
-	size_t part;
-
-	if (!stream->avail) {
-		_leave("no write");
-		return len;
-	}
-
-	_enter("R=%x[%x]", wreq->debug_id, subreq ? subreq->debug_index : 0);
-
-	if (subreq && start != subreq->start + subreq->len) {
-		netfs_issue_write(wreq, stream);
-		subreq = NULL;
-	}
-
-	if (!stream->construct)
-		netfs_prepare_write(wreq, stream, start);
-	subreq = stream->construct;
-
-	part = umin(stream->sreq_max_len - subreq->len, len);
-	_debug("part %zx/%zx %zx/%zx", subreq->len, stream->sreq_max_len, part, len);
-	subreq->len += part;
-	subreq->nr_segs++;
-
-	if (subreq->len >= stream->sreq_max_len ||
-	    subreq->nr_segs >= stream->sreq_max_segs ||
-	    to_eof) {
-		netfs_issue_write(wreq, stream);
-		subreq = NULL;
-	}
-
-	return part;
-}
-
-/*
- * Prepare and issue a subrequest.
- * TODO: Replace with combined ->prepare/->issue call().
- */
-static int netfs_prep_and_issue_subreq(struct netfs_io_request *wreq,
-				       struct netfs_io_stream *stream,
-				       struct netfs_io_subrequest *subreq)
-{
-	stream->sreq_max_len	= UINT_MAX;
-	stream->sreq_max_segs	= INT_MAX;
-	switch (stream->source) {
-	case NETFS_UPLOAD_TO_SERVER:
-		netfs_stat(&netfs_n_wh_upload);
-		stream->sreq_max_len = wreq->wsize;
-		break;
-	case NETFS_WRITE_TO_CACHE:
-		netfs_stat(&netfs_n_wh_write);
-		break;
-	default:
-		WARN_ON_ONCE(1);
-		break;
-	}
-
-	if (stream->prepare_write)
-		stream->prepare_write(subreq);
-	netfs_prepare_buffered_write_buffer(subreq, stream->sreq_max_segs);
-	iov_iter_bvec_queue(&subreq->io_iter, ITER_SOURCE,
-			    subreq->content.bvecq, subreq->content.slot,
-			    subreq->content.offset,
-			    subreq->len);
-	trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
-	stream->issue_write(subreq);
-	return 0;
-}
-#endif
-
 /*
  * Issue writes for a stream.
  */