[PATCH v2 14/21] cifs: Remove support for ITER_FOLIOQ from smb_extract_iter_to_rdma()

[David Howells <dhowells@redhat.com>]

netfslib now only presents an bvecq queue and an associated ITER_BVECQ
iterator to the filesystem, so it isn't going to see the ITER_FOLIOQ
iterator.  So remove that code.

Netfslib also won't supply ITER_BVEC/KVEC iterators, though smbdirect
might; further in future, it won't supply iterators at all, but rather a
bvecq slice (that can be used to construct an iterator).

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Paulo Alcantara <pc@manguebit.org>
cc: Stefan Metzmacher <metze@samba.org>
cc: Shyam Prasad N <sprasad@microsoft.com>
cc: Tom Talpey <tom@talpey.com>
cc: linux-cifs@vger.kernel.org
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
---
 fs/smb/smbdirect/connection.c | 68 -----------------------------------
 1 file changed, 68 deletions(-)

diff --git a/fs/smb/smbdirect/connection.c b/fs/smb/smbdirect/connection.c
index 4d2a1700104e..8858e1dfbc25 100644
--- a/fs/smb/smbdirect/connection.c
+++ b/fs/smb/smbdirect/connection.c
@@ -6,7 +6,6 @@
 
 #include "internal.h"
 #include <linux/bvecq.h>
-#include <linux/folio_queue.h>
 
 struct smbdirect_map_sges {
 	struct ib_sge *sge;
@@ -2130,70 +2129,6 @@ static ssize_t smbdirect_map_sges_from_kvec(struct iov_iter *iter,
 	return ret;
 }
 
-/*
- * Extract folio fragments from a FOLIOQ-class iterator and add them to an
- * ib_sge list.  The folios are not pinned.
- */
-static ssize_t smbdirect_map_sges_from_folioq(struct iov_iter *iter,
-					      struct smbdirect_map_sges *state,
-					      ssize_t maxsize)
-{
-	const struct folio_queue *folioq = iter->folioq;
-	unsigned int slot = iter->folioq_slot;
-	ssize_t ret = 0;
-	size_t offset = iter->iov_offset;
-
-	if (WARN_ON_ONCE(!folioq))
-		return -EIO;
-
-	if (slot >= folioq_nr_slots(folioq)) {
-		folioq = folioq->next;
-		if (WARN_ON_ONCE(!folioq))
-			return -EIO;
-		slot = 0;
-	}
-
-	do {
-		struct folio *folio = folioq_folio(folioq, slot);
-		size_t fsize = folioq_folio_size(folioq, slot);
-
-		if (offset < fsize) {
-			size_t part = umin(maxsize, fsize - offset);
-			bool ok;
-
-			ok = smbdirect_map_sges_single_page(state,
-							    folio_page(folio, 0),
-							    offset,
-							    part);
-			if (!ok)
-				return -EIO;
-
-			offset += part;
-			ret += part;
-			maxsize -= part;
-		}
-
-		if (offset >= fsize) {
-			offset = 0;
-			slot++;
-			if (slot >= folioq_nr_slots(folioq)) {
-				if (!folioq->next) {
-					WARN_ON_ONCE(ret < iter->count);
-					break;
-				}
-				folioq = folioq->next;
-				slot = 0;
-			}
-		}
-	} while (state->num_sge < state->max_sge && maxsize > 0);
-
-	iter->folioq = folioq;
-	iter->folioq_slot = slot;
-	iter->iov_offset = offset;
-	iter->count -= ret;
-	return ret;
-}
-
 /*
  * Extract page fragments from up to the given amount of the source iterator
  * and build up an ib_sge list that refers to all of those bits.  The ib_sge list
@@ -2224,9 +2159,6 @@ static ssize_t smbdirect_map_sges_from_iter(struct iov_iter *iter, size_t len,
 	case ITER_KVEC:
 		ret = smbdirect_map_sges_from_kvec(iter, state, len);
 		break;
-	case ITER_FOLIOQ:
-		ret = smbdirect_map_sges_from_folioq(iter, state, len);
-		break;
 	default:
 		WARN_ONCE(1, "iov_iter_type[%u]\n", iov_iter_type(iter));
 		return -EIO;