ceph: specify max_bytes on readdir replies

Specify max bytes in request to bound size of reply.  Add associated
mount option with default value of 512 KB.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ceph/ceph_fs.h b/fs/ceph/ceph_fs.h
index 715e39ce517a..3b9eeed097b3 100644
--- a/fs/ceph/ceph_fs.h
+++ b/fs/ceph/ceph_fs.h
@@ -361,6 +361,7 @@ union ceph_mds_request_args {
         struct {
                 __le32 frag;                 /* which dir fragment */
                 __le32 max_entries;          /* how many dentries to grab */
+                __le32 max_bytes;
         } __attribute__ ((packed)) readdir;
         struct {
                 __le32 mode;