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, 3 insertions, 1 deletions

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 395adc5fceb..3725c9ee9d0 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -66,7 +66,8 @@ struct ceph_mount_args {
         int congestion_kb;    /* max writeback in flight */
         int caps_wanted_delay_min, caps_wanted_delay_max;
         int cap_release_safety;
-        int max_readdir;      /* max readdir size */
+        int max_readdir;       /* max readdir result (entires) */
+        int max_readdir_bytes; /* max readdir result (bytes) */
         char *snapdir_name;   /* default ".snap" */
         char *name;
         char *secret;
@@ -81,6 +82,7 @@ struct ceph_mount_args {
 #define CEPH_OSD_IDLE_TTL_DEFAULT    60
 #define CEPH_MOUNT_RSIZE_DEFAULT    (512*1024) /* readahead */
 #define CEPH_MAX_READDIR_DEFAULT    1024
+#define CEPH_MAX_READDIR_BYTES_DEFAULT    (512*1024)
 
 #define CEPH_MSG_MAX_FRONT_LEN  (16*1024*1024)
 #define CEPH_MSG_MAX_DATA_LEN   (16*1024*1024)