From: Trond Myklebust <trondmy@gmail.com>
Date: Mon, 6 Jan 2020 15:25:01 -0500
Subject: [PATCH] NFS: Revalidate the file mapping on all fatal writeback
 errors
Git-commit: b8946d7bfb9417ec171693d4478a831420aead5f
Patch-mainline: v5.6-rc1
References: git-fixes

If a write or commit failed, and the mapping sees a fatal error, we
need to revalidate the contents of that mapping.

Fixes: 06c9fdf3b9f1 ("NFS: On fatal writeback errors, we need to call nfs_inode_remove_request()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Acked-by: NeilBrown <neilb@suse.com>

---
 fs/nfs/write.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -256,8 +256,11 @@ static void nfs_set_pageerror(struct add
 
 static void nfs_mapping_set_error(struct page *page, int error)
 {
+	struct address_space *mapping = page_file_mapping(page);
+
 	SetPageError(page);
-	mapping_set_error(page_file_mapping(page), error);
+	mapping_set_error(mapping, error);
+	nfs_set_pageerror(mapping);
 }
 
 /*
@@ -600,7 +603,6 @@ release_request:
 
 static void nfs_write_error(struct nfs_page *req, int error)
 {
-	nfs_set_pageerror(page_file_mapping(req->wb_page));
 	nfs_mapping_set_error(req->wb_page, error);
 	nfs_inode_remove_request(req);
 	nfs_end_page_writeback(req);
@@ -1006,7 +1008,6 @@ static void nfs_write_completion(struct
 		nfs_list_remove_request(req);
 		if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
 		    (hdr->good_bytes < bytes)) {
-			nfs_set_pageerror(page_file_mapping(req->wb_page));
 			nfs_mapping_set_error(req->wb_page, hdr->error);
 			goto remove_req;
 		}