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, 2 insertions, 0 deletions

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index d3bb8132a1aa..4fd30900eff7 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -233,6 +233,7 @@ static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir)
         u32 ftype;
         struct ceph_mds_reply_info_parsed *rinfo;
         const int max_entries = client->mount_args->max_readdir;
+        const int max_bytes = client->mount_args->max_readdir_bytes;
 
         dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off);
         if (fi->at_end)
@@ -316,6 +317,7 @@ more:
                 req->r_readdir_offset = fi->next_offset;
                 req->r_args.readdir.frag = cpu_to_le32(frag);
                 req->r_args.readdir.max_entries = cpu_to_le32(max_entries);
+                req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes);
                 req->r_num_caps = max_entries + 1;
                 err = ceph_mdsc_do_request(mdsc, NULL, req);
                 if (err < 0) {