ceph: preallocate buffer for readdir reply

Preallocate buffer for readdir reply. Limit number of entries in
readdir reply according to the buffer size.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 68288917c737..e90cfccf93bd 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -67,6 +67,7 @@ struct ceph_mds_reply_info_parsed {
                 /* for readdir results */
                 struct {
                         struct ceph_mds_reply_dirfrag *dir_dir;
+                        size_t                        dir_buf_size;
                         int                           dir_nr;
                         char                          **dir_dname;
                         u32                           *dir_dname_len;
@@ -346,7 +347,8 @@ extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc,
                                     struct dentry *dn);
 
 extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
-
+extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
+                                           struct inode *dir);
 extern struct ceph_mds_request *
 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
 extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,