[PATCH 3/7] nfs: simplify nfs_folio_find_and_lock_request

[Christoph Hellwig <hch@lst.de>]

nfs_folio_find_and_lock_request and the nfs_page_group_lock_head helper
called by it spend quite some effort to deal with head vs subrequests.
But given that only the head request can be stashed in the folio private
data, non of that is required.

Fold the locking logic from nfs_page_group_lock_head into
nfs_folio_find_and_lock_request and simplify the result based on the
invariant that we always find the head request in the folio private data.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/nfs/pagelist.c        | 19 -------------------
 fs/nfs/write.c           | 38 +++++++++++++++++++++-----------------
 include/linux/nfs_page.h |  1 -
 3 files changed, 21 insertions(+), 37 deletions(-)

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 3b006bcbcc87a2..e48cc69a2361aa 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -187,25 +187,6 @@ nfs_async_iocounter_wait(struct rpc_task *task, struct nfs_lock_context *l_ctx)
 }
 EXPORT_SYMBOL_GPL(nfs_async_iocounter_wait);
 
-/*
- * nfs_page_lock_head_request - page lock the head of the page group
- * @req: any member of the page group
- */
-struct nfs_page *
-nfs_page_group_lock_head(struct nfs_page *req)
-{
-	struct nfs_page *head = req->wb_head;
-
-	while (!nfs_lock_request(head)) {
-		int ret = nfs_wait_on_request(head);
-		if (ret < 0)
-			return ERR_PTR(ret);
-	}
-	if (head != req)
-		kref_get(&head->wb_kref);
-	return head;
-}
-
 /*
  * nfs_unroll_locks -  unlock all newly locked reqs and wait on @req
  * @head: head request of page group, must be holding head lock
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 5410c18a006937..58e5b78ff436b9 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -197,28 +197,32 @@ static struct nfs_page *nfs_folio_find_head_request(struct folio *folio)
 static struct nfs_page *nfs_folio_find_and_lock_request(struct folio *folio)
 {
 	struct inode *inode = folio->mapping->host;
-	struct nfs_page *req, *head;
+	struct nfs_page *head;
 	int ret;
 
-	for (;;) {
-		req = nfs_folio_find_head_request(folio);
-		if (!req)
-			return req;
-		head = nfs_page_group_lock_head(req);
-		if (head != req)
-			nfs_release_request(req);
-		if (IS_ERR(head))
-			return head;
-		ret = nfs_cancel_remove_inode(head, inode);
-		if (ret < 0) {
-			nfs_unlock_and_release_request(head);
+retry:
+	head = nfs_folio_find_head_request(folio);
+	if (!head)
+		return NULL;
+
+	while (!nfs_lock_request(head)) {
+		ret = nfs_wait_on_request(head);
+		if (ret < 0)
 			return ERR_PTR(ret);
-		}
-		/* Ensure that nobody removed the request before we locked it */
-		if (head == folio->private)
-			break;
+	}
+
+	/* Ensure that nobody removed the request before we locked it */
+	if (head != folio->private) {
 		nfs_unlock_and_release_request(head);
+		goto retry;
 	}
+
+	ret = nfs_cancel_remove_inode(head, inode);
+	if (ret < 0) {
+		nfs_unlock_and_release_request(head);
+		return ERR_PTR(ret);
+	}
+
 	return head;
 }
 
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index 7bc31df457ea58..e799d93626f117 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -155,7 +155,6 @@ extern size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
 extern  int nfs_wait_on_request(struct nfs_page *);
 extern	void nfs_unlock_request(struct nfs_page *req);
 extern	void nfs_unlock_and_release_request(struct nfs_page *);
-extern	struct nfs_page *nfs_page_group_lock_head(struct nfs_page *req);
 extern	int nfs_page_group_lock_subrequests(struct nfs_page *head);
 extern void nfs_join_page_group(struct nfs_page *head,
 				struct nfs_commit_info *cinfo,
-- 
2.43.0