From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Tue, 20 Nov 2012 20:16:30 +0000 (-0500)
Subject: NFSv4.1: Fix nfs4_callback_recallslot to work with dynamic slot allocation
X-Git-Tag: firefly_0821_release~3680^2~1413^2~46
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=ce008c4bb9766bc7eeb02e8299c8baadc25da90b;p=firefly-linux-kernel-4.4.55.git

NFSv4.1: Fix nfs4_callback_recallslot to work with dynamic slot allocation

Ensure that the NFSv4.1 CB_RECALL_SLOT callback updates the slot table
target max slotid safely.

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

diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index 0ef047b7d28d..15b9879d6fbb 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -576,7 +576,7 @@ __be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
 	if (args->crsa_target_max_slots == fc_tbl->max_slots)
 		goto out;
 
-	fc_tbl->target_highest_slotid = args->crsa_target_max_slots;
+	nfs41_set_target_slotid(fc_tbl, args->crsa_target_max_slots);
 	nfs41_handle_recall_slot(cps->clp);
 out:
 	dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 42c58691fb41..5d4e82b10c3c 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -260,6 +260,8 @@ extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data,
 
 extern struct nfs4_slot *nfs4_alloc_slots(struct nfs4_slot_table *table,
 		u32 max_slots, gfp_t gfp_flags);
+extern void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
+		u32 target_highest_slotid);
 
 static inline bool
 is_ds_only_client(struct nfs_client *clp)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 52435ec44193..62212231ce62 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -498,6 +498,14 @@ static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl,
 	tbl->generation++;
 }
 
+void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
+		u32 target_highest_slotid)
+{
+	spin_lock(&tbl->slot_tbl_lock);
+	nfs41_set_target_slotid_locked(tbl, target_highest_slotid);
+	spin_unlock(&tbl->slot_tbl_lock);
+}
+
 static void nfs41_set_server_slotid_locked(struct nfs4_slot_table *tbl,
 		u32 highest_slotid)
 {