[PATCH 4.7 094/186] pNFS: Separate handling of NFS4ERR_LAYOUTTRYLATER and RECALLCONFLICT

[Greg Kroah-Hartman]

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>

commit e85d7ee42003314652ab3ae2c60e3b8cd793b65f upstream.

They are not the same error, and need to be handled differently.

Fixes: 183d9e7b112aa ("pnfs: rework LAYOUTGET retry handling")
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/nfs/nfs4proc.c |   23 ++++++++++++++---------
 fs/nfs/pnfs.c     |    1 +
 2 files changed, 15 insertions(+), 9 deletions(-)

--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -427,6 +427,7 @@ static int nfs4_do_handle_exception(stru
 		case -NFS4ERR_DELAY:
 			nfs_inc_server_stats(server, NFSIOS_DELAY);
 		case -NFS4ERR_GRACE:
+		case -NFS4ERR_LAYOUTTRYLATER:
 		case -NFS4ERR_RECALLCONFLICT:
 			exception->delay = 1;
 			return 0;
@@ -7869,11 +7870,12 @@ nfs4_layoutget_handle_exception(struct r
 	struct inode *inode = lgp->args.inode;
 	struct nfs_server *server = NFS_SERVER(inode);
 	struct pnfs_layout_hdr *lo;
-	int status = task->tk_status;
+	int nfs4err = task->tk_status;
+	int err, status = 0;
 
 	dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
 
-	switch (status) {
+	switch (nfs4err) {
 	case 0:
 		goto out;
 
@@ -7905,12 +7907,11 @@ nfs4_layoutget_handle_exception(struct r
 			status = -EOVERFLOW;
 			goto out;
 		}
-		/* Fallthrough */
+		status = -EBUSY;
+		break;
 	case -NFS4ERR_RECALLCONFLICT:
-		nfs4_handle_exception(server, -NFS4ERR_RECALLCONFLICT,
-					exception);
 		status = -ERECALLCONFLICT;
-		goto out;
+		break;
 	case -NFS4ERR_EXPIRED:
 	case -NFS4ERR_BAD_STATEID:
 		exception->timeout = 0;
@@ -7941,9 +7942,13 @@ nfs4_layoutget_handle_exception(struct r
 			spin_unlock(&inode->i_lock);
 	}
 
-	status = nfs4_handle_exception(server, status, exception);
-	if (exception->retry)
-		status = -EAGAIN;
+	err = nfs4_handle_exception(server, nfs4err, exception);
+	if (!status) {
+		if (exception->retry)
+			status = -EAGAIN;
+		else
+			status = err;
+	}
 out:
 	dprintk("<-- %s\n", __func__);
 	return status;
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1647,6 +1647,7 @@ lookup_again:
 				 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
 	if (IS_ERR(lseg)) {
 		switch(PTR_ERR(lseg)) {
+		case -EBUSY:
 		case -ERECALLCONFLICT:
 			if (time_after(jiffies, giveup))
 				lseg = NULL;