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>

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index a58666a..e7af647 100644 (file)
--- 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 {