NFS: Don't wait for congestion in nfs_update_request()

It is redundant, and will interfere with the call to
balance_dirty_pages_ratelimited_nr in generic_file_write().

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

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 8593965..dbad89c 100644 (file)
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -594,34 +594,6 @@ static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, un
 }
 #endif
 
-static int nfs_wait_on_write_congestion(struct address_space *mapping)
-{
-       struct inode *inode = mapping->host;
-       struct backing_dev_info *bdi = mapping->backing_dev_info;
-       int ret = 0;
-
-       might_sleep();
-
-       if (!bdi_write_congested(bdi))
-               return 0;
-
-       nfs_inc_stats(inode, NFSIOS_CONGESTIONWAIT);
-
-       do {
-               struct rpc_clnt *clnt = NFS_CLIENT(inode);
-               sigset_t oldset;
-
-               rpc_clnt_sigmask(clnt, &oldset);
-               ret = congestion_wait_interruptible(WRITE, HZ/10);
-               rpc_clnt_sigunmask(clnt, &oldset);
-               if (ret == -ERESTARTSYS)
-                       break;
-               ret = 0;
-       } while (bdi_write_congested(bdi));
-
-       return ret;
-}
-
 /*
  * Try to update any existing write request, or create one if there is none.
  * In order to match, the request's credentials must match those of
@@ -640,8 +612,6 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
 
        end = offset + bytes;
 
-       if (nfs_wait_on_write_congestion(mapping))
-               return ERR_PTR(-ERESTARTSYS);
        for (;;) {
                /* Loop over all inode entries and see if we find
                 * A request for the page we wish to update