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, 33 insertions, 0 deletions

diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c
index 441484ab7e94..22d3b47fb1be 100644
--- a/fs/ceph/debugfs.c
+++ b/fs/ceph/debugfs.c
@@ -320,6 +320,30 @@ DEFINE_SHOW_FUNC(osdc_show)
 DEFINE_SHOW_FUNC(dentry_lru_show)
 DEFINE_SHOW_FUNC(caps_show)
 
+static int congestion_kb_set(void *data, u64 val)
+{
+        struct ceph_client *client = (struct ceph_client *)data;
+
+        if (client)
+                client->mount_args->congestion_kb = (int)val;
+
+        return 0;
+}
+
+static int congestion_kb_get(void *data, u64 *val)
+{
+        struct ceph_client *client = (struct ceph_client *)data;
+
+        if (client)
+                *val = (u64)client->mount_args->congestion_kb;
+
+        return 0;
+}
+
+
+DEFINE_SIMPLE_ATTRIBUTE(congestion_kb_fops, congestion_kb_get,
+                        congestion_kb_set, "%llu\n");
+
 int __init ceph_debugfs_init(void)
 {
         ceph_debugfs_dir = debugfs_create_dir("ceph", NULL);
@@ -409,6 +433,14 @@ int ceph_debugfs_client_init(struct ceph_client *client)
         if (!client->debugfs_caps)
                 goto out;
 
+        client->debugfs_congestion_kb = debugfs_create_file("writeback_congestion_kb",
+                                                   0600,
+                                                   client->debugfs_dir,
+                                                   client,
+                                                   &congestion_kb_fops);
+        if (!client->debugfs_congestion_kb)
+                goto out;
+
         sprintf(name, "../../bdi/%s", dev_name(client->sb->s_bdi->dev));
         client->debugfs_bdi = debugfs_create_symlink("bdi", client->debugfs_dir,
                                                      name);
@@ -431,6 +463,7 @@ void ceph_debugfs_client_cleanup(struct ceph_client *client)
         debugfs_remove(client->osdc.debugfs_file);
         debugfs_remove(client->mdsc.debugfs_file);
         debugfs_remove(client->monc.debugfs_file);
+        debugfs_remove(client->debugfs_congestion_kb);
         debugfs_remove(client->debugfs_dir);
 }