[PATCH 44/50] nfs41: allow async version layoutreturn

[Tom Haynes <thomas.haynes@primarydata.com>]

From: Peng Tao <tao.peng@primarydata.com>

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Tom Haynes <loghyr@primarydata.com>
---
 fs/nfs/nfs4proc.c | 11 +++++++++--
 fs/nfs/pnfs.c     | 12 +++++++-----
 fs/nfs/pnfs.h     |  2 +-
 3 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index bf5ef58..53df457 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7800,7 +7800,7 @@ static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
 	.rpc_release = nfs4_layoutreturn_release,
 };
 
-int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
+int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
 {
 	struct rpc_task *task;
 	struct rpc_message msg = {
@@ -7814,16 +7814,23 @@ int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
 		.rpc_message = &msg,
 		.callback_ops = &nfs4_layoutreturn_call_ops,
 		.callback_data = lrp,
+		.flags = RPC_TASK_ASYNC,
 	};
-	int status;
+	int status = 0;
 
 	dprintk("--> %s\n", __func__);
 	nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
 	task = rpc_run_task(&task_setup_data);
 	if (IS_ERR(task))
 		return PTR_ERR(task);
+	if (sync == false)
+		goto out;
+	status = nfs4_wait_for_completion_rpc_task(task);
+	if (status != 0)
+		goto out;
 	status = task->tk_status;
 	trace_nfs4_layoutreturn(lrp->args.inode, status);
+out:
 	dprintk("<-- %s status=%d\n", __func__, status);
 	rpc_put_task(task);
 	return status;
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index a368c74..6f36318 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -52,7 +52,8 @@ static LIST_HEAD(pnfs_modules_tbl);
 
 static int
 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
-		       enum pnfs_iomode iomode, u64 offset, u64 length);
+		       enum pnfs_iomode iomode, u64 offset, u64 length,
+		       bool sync);
 
 /* Return the registered pnfs layout driver module matching given id */
 static struct pnfs_layoutdriver_type *
@@ -392,7 +393,7 @@ pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 			spin_unlock(&inode->i_lock);
 			/* hdr reference dropped in nfs4_layoutreturn_release */
 			pnfs_send_layoutreturn(lo, stateid, iomode, 0,
-					       NFS4_MAX_UINT64);
+					       NFS4_MAX_UINT64, true);
 			spin_lock(&inode->i_lock);
 			pnfs_layout_remove_lseg(lo, lseg);
 			spin_unlock(&inode->i_lock);
@@ -905,7 +906,8 @@ static void pnfs_clear_layoutcommit(struct inode *inode,
 
 static int
 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
-		       enum pnfs_iomode iomode, u64 offset, u64 length)
+		       enum pnfs_iomode iomode, u64 offset, u64 length,
+		       bool sync)
 {
 	struct inode *ino = lo->plh_inode;
 	struct nfs4_layoutreturn *lrp;
@@ -931,7 +933,7 @@ pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid,
 	lrp->clp = NFS_SERVER(ino)->nfs_client;
 	lrp->cred = lo->plh_lc_cred;
 
-	status = nfs4_proc_layoutreturn(lrp);
+	status = nfs4_proc_layoutreturn(lrp, sync);
 out:
 	if (status) {
 		spin_lock(&ino->i_lock);
@@ -998,7 +1000,7 @@ _pnfs_return_layout(struct inode *ino)
 	pnfs_free_lseg_list(&tmp_list);
 
 	status = pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, 0,
-					NFS4_MAX_UINT64);
+					NFS4_MAX_UINT64, true);
 out:
 	dprintk("<-- %s status: %d\n", __func__, status);
 	return status;
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 26e7cd8..7a33c50 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -219,7 +219,7 @@ extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 				   struct pnfs_device *dev,
 				   struct rpc_cred *cred);
 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
-extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
+extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
 
 /* pnfs.c */
 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
-- 
1.9.3