ceph: make ->sync_fs not wait if wait==0

The ->sync_fs() super op only needs to wait if wait is true.  Otherwise,
just get some dirty cap writeback started.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 13 insertions, 4 deletions

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index d80699a4dc26..7f751f2850ba 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -102,12 +102,21 @@ static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf)
 }
 
 
-static int ceph_syncfs(struct super_block *sb, int wait)
+static int ceph_sync_fs(struct super_block *sb, int wait)
 {
-        dout("sync_fs %d\n", wait);
+        struct ceph_client *client = ceph_sb_to_client(sb);
+
+        if (!wait) {
+                dout("sync_fs (non-blocking)\n");
+                ceph_flush_dirty_caps(&client->mdsc);
+                dout("sync_fs (non-blocking) done\n");
+                return 0;
+        }
+
+        dout("sync_fs (blocking)\n");
         ceph_osdc_sync(&ceph_sb_to_client(sb)->osdc);
         ceph_mdsc_sync(&ceph_sb_to_client(sb)->mdsc);
-        dout("sync_fs %d done\n", wait);
+        dout("sync_fs (blocking) done\n");
         return 0;
 }
 
@@ -278,7 +287,7 @@ static const struct super_operations ceph_super_ops = {
         .alloc_inode    = ceph_alloc_inode,
         .destroy_inode  = ceph_destroy_inode,
         .write_inode    = ceph_write_inode,
-        .sync_fs        = ceph_syncfs,
+        .sync_fs        = ceph_sync_fs,
         .put_super      = ceph_put_super,
         .show_options   = ceph_show_options,
         .statfs         = ceph_statfs,