1 files changed, 15 insertions, 5 deletions

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 745a612dbe22..0be5050638f7 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -29,8 +29,6 @@
 static struct kmem_cache *nfs_page_cachep;
 static const struct rpc_call_ops nfs_pgio_common_ops;
 
-static void nfs_free_request(struct nfs_page *);
-
 static bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount)
 {
 	p->npages = pagecount;
@@ -232,20 +230,28 @@ nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev)
 	WARN_ON_ONCE(prev == req);
 
 	if (!prev) {
+		/* a head request */
 		req->wb_head = req;
 		req->wb_this_page = req;
 	} else {
+		/* a subrequest */
 		WARN_ON_ONCE(prev->wb_this_page != prev->wb_head);
 		WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &prev->wb_head->wb_flags));
 		req->wb_head = prev->wb_head;
 		req->wb_this_page = prev->wb_this_page;
 		prev->wb_this_page = req;
 
+		/* All subrequests take a ref on the head request until
+		 * nfs_page_group_destroy is called */
+		kref_get(&req->wb_head->wb_kref);
+
 		/* grab extra ref if head request has extra ref from
 		 * the write/commit path to handle handoff between write
 		 * and commit lists */
-		if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags))
+		if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags)) {
+			set_bit(PG_INODE_REF, &req->wb_flags);
 			kref_get(&req->wb_kref);
+		}
 	}
 }
 
@@ -262,6 +268,10 @@ nfs_page_group_destroy(struct kref *kref)
 	struct nfs_page *req = container_of(kref, struct nfs_page, wb_kref);
 	struct nfs_page *tmp, *next;
 
+	/* subrequests must release the ref on the head request */
+	if (req->wb_head != req)
+		nfs_release_request(req->wb_head);
+
 	if (!nfs_page_group_sync_on_bit(req, PG_TEARDOWN))
 		return;
 
@@ -387,7 +397,7 @@ static void nfs_clear_request(struct nfs_page *req)
  *
  * Note: Should never be called with the spinlock held!
  */
-static void nfs_free_request(struct nfs_page *req)
+void nfs_free_request(struct nfs_page *req)
 {
 	WARN_ON_ONCE(req->wb_this_page != req);
 
@@ -917,7 +927,6 @@ static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
 			nfs_pageio_doio(desc);
 			if (desc->pg_error < 0)
 				return 0;
-			desc->pg_moreio = 0;
 			if (desc->pg_recoalesce)
 				return 0;
 			/* retry add_request for this subreq */
@@ -964,6 +973,7 @@ static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc)
 		desc->pg_count = 0;
 		desc->pg_base = 0;
 		desc->pg_recoalesce = 0;
+		desc->pg_moreio = 0;
 
 		while (!list_empty(&head)) {
 			struct nfs_page *req;