[v2,9/9] NFSv4: Handle NFS4ERR_OLD_STATEID in LOCKU
diff mbox series

Message ID 20190916204419.21717-10-trond.myklebust@hammerspace.com
State New
Headers show
Series
  • Various NFSv4 state error handling fixes
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Commit Message

Trond Myklebust Sept. 16, 2019, 8:44 p.m. UTC
If a LOCKU request receives a NFS4ERR_OLD_STATEID, then bump the
seqid before resending. Ensure we only bump the seqid by 1.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---
 fs/nfs/nfs4proc.c | 48 +++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 44 insertions(+), 4 deletions(-)

Patch
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diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index c14af2c1c6b6..2fe6f8737023 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6411,6 +6411,42 @@  static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *
 	return err;
 }
 
+/*
+ * Update the seqid of a lock stateid after receiving
+ * NFS4ERR_OLD_STATEID
+ */
+static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
+		struct nfs4_lock_state *lsp)
+{
+	struct nfs4_state *state = lsp->ls_state;
+	bool ret = false;
+
+	spin_lock(&state->state_lock);
+	if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
+		goto out;
+	if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
+		nfs4_stateid_seqid_inc(dst);
+	else
+		dst->seqid = lsp->ls_stateid.seqid;
+	ret = true;
+out:
+	spin_unlock(&state->state_lock);
+	return ret;
+}
+
+static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
+		struct nfs4_lock_state *lsp)
+{
+	struct nfs4_state *state = lsp->ls_state;
+	bool ret;
+
+	spin_lock(&state->state_lock);
+	ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
+	nfs4_stateid_copy(dst, &lsp->ls_stateid);
+	spin_unlock(&state->state_lock);
+	return ret;
+}
+
 struct nfs4_unlockdata {
 	struct nfs_locku_args arg;
 	struct nfs_locku_res res;
@@ -6444,6 +6480,7 @@  static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
 	locks_init_lock(&p->fl);
 	locks_copy_lock(&p->fl, fl);
 	p->server = NFS_SERVER(inode);
+	nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
 	return p;
 }
 
@@ -6482,10 +6519,14 @@  static void nfs4_locku_done(struct rpc_task *task, void *data)
 					task->tk_msg.rpc_cred);
 			/* Fall through */
 		case -NFS4ERR_BAD_STATEID:
-		case -NFS4ERR_OLD_STATEID:
 		case -NFS4ERR_STALE_STATEID:
-			if (!nfs4_stateid_match(&calldata->arg.stateid,
-						&calldata->lsp->ls_stateid))
+			if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
+						calldata->lsp))
+				rpc_restart_call_prepare(task);
+			break;
+		case -NFS4ERR_OLD_STATEID:
+			if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
+						calldata->lsp))
 				rpc_restart_call_prepare(task);
 			break;
 		default:
@@ -6508,7 +6549,6 @@  static void nfs4_locku_prepare(struct rpc_task *task, void *data)
 
 	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
 		goto out_wait;
-	nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
 	if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
 		/* Note: exit _without_ running nfs4_locku_done */
 		goto out_no_action;