ceph: don't request excl caps when mount is readonly

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index a58666a3f8dd..e7af6479c9bc 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -1855,14 +1855,17 @@ retry_locked:
                         retain |= CEPH_CAP_ANY;       /* be greedy */
                 } else if (S_ISDIR(inode->i_mode) &&
                            (issued & CEPH_CAP_FILE_SHARED) &&
-                            __ceph_dir_is_complete(ci)) {
+                           __ceph_dir_is_complete(ci)) {
                         /*
                          * If a directory is complete, we want to keep
                          * the exclusive cap. So that MDS does not end up
                          * revoking the shared cap on every create/unlink
                          * operation.
                          */
-                        want = CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
+                        if (IS_RDONLY(inode))
+                                want = CEPH_CAP_ANY_SHARED;
+                        else
+                                want = CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL;
                         retain |= want;
                 } else {