NFS: Add functionality to allow waiting on all outstanding reads to complete

This will later allow NFS locking code to wait for readahead to complete
before releasing byte range locks.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index f6b1956f3c86..fc01d5cb4cf1 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -59,11 +59,18 @@ struct nfs_lockowner {
         pid_t l_pid;
 };
 
+#define NFS_IO_INPROGRESS 0
+struct nfs_io_counter {
+        unsigned long flags;
+        atomic_t io_count;
+};
+
 struct nfs_lock_context {
         atomic_t count;
         struct list_head list;
         struct nfs_open_context *open_context;
         struct nfs_lockowner lockowner;
+        struct nfs_io_counter io_count;
 };
 
 struct nfs4_state;