NFS: Ensure that the read code cleans up properly when rpc_run_task() fails

In the case of readpage() we need to ensure that the pages get unlocked,
and that the error is flagged.

In the case of O_DIRECT, we need to ensure that the pages are all released.

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

1 files changed, 13 insertions, 6 deletions

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index e44200579c8d..9d9085b93a32 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -229,14 +229,20 @@ static void nfs_direct_complete(struct nfs_direct_req *dreq)
 static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
 {
         struct nfs_read_data *data = calldata;
-        struct nfs_direct_req *dreq = (struct nfs_direct_req *) data->req;
 
-        if (nfs_readpage_result(task, data) != 0)
-                return;
+        nfs_readpage_result(task, data);
+}
+
+static void nfs_direct_read_release(void *calldata)
+{
+
+        struct nfs_read_data *data = calldata;
+        struct nfs_direct_req *dreq = (struct nfs_direct_req *) data->req;
+        int status = data->task.tk_status;
 
         spin_lock(&dreq->lock);
-        if (unlikely(task->tk_status < 0)) {
-                dreq->error = task->tk_status;
+        if (unlikely(status < 0)) {
+                dreq->error = status;
                 spin_unlock(&dreq->lock);
         } else {
                 dreq->count += data->res.count;
@@ -249,11 +255,12 @@ static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
 
         if (put_dreq(dreq))
                 nfs_direct_complete(dreq);
+        nfs_readdata_release(calldata);
 }
 
 static const struct rpc_call_ops nfs_read_direct_ops = {
         .rpc_call_done = nfs_direct_read_result,
-        .rpc_release = nfs_readdata_release,
+        .rpc_release = nfs_direct_read_release,
 };
 
 /*