NFS: Relax requirements in nfs_flush_incompatible

If two processes share the same credentials and NFSv4 open stateid, then
allow them both to dirty the same page, even if their nfs_open_context
differs.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 0aa8d6f23b4c..2c26e04d9396 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1130,7 +1130,8 @@ int nfs_flush_incompatible(struct file *file, struct page *page)
                 if (req == NULL)
                         return 0;
                 l_ctx = req->wb_lock_context;
-                do_flush = req->wb_page != page || req->wb_context != ctx;
+                do_flush = req->wb_page != page ||
+                        !nfs_match_open_context(req->wb_context, ctx);
                 /* for now, flush if more than 1 request in page_group */
                 do_flush |= req->wb_this_page != req;
                 if (l_ctx && flctx &&