ceph: writeback congestion control

Set bdi congestion bit when amount of write data in flight exceeds adjustable
threshold.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 2304bd2844a4..62d9ae482d72 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -59,6 +59,7 @@ struct ceph_mount_args {
         int wsize;
         int rsize;            /* max readahead */
         int max_readdir;      /* max readdir size */
+        int congestion_kb;      /* max readdir size */
         int osd_timeout;
         char *snapdir_name;   /* default ".snap" */
         char *name;
@@ -136,6 +137,7 @@ struct ceph_client {
         struct workqueue_struct *wb_wq;
         struct workqueue_struct *pg_inv_wq;
         struct workqueue_struct *trunc_wq;
+        atomic_long_t writeback_count;
 
         struct backing_dev_info backing_dev_info;
 
@@ -143,6 +145,7 @@ struct ceph_client {
         struct dentry *debugfs_monmap;
         struct dentry *debugfs_mdsmap, *debugfs_osdmap;
         struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps;
+        struct dentry *debugfs_congestion_kb;
         struct dentry *debugfs_bdi;
 #endif
 };