NFSv4: Support recalling delegations by stateid

There appear to be some rogue servers out there that issue multiple
delegations with different stateids for the same file. Ensure that when we
return delegations, we do so on a per-stateid basis rather than a per-file
basis.

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

1 files changed, 50 insertions, 30 deletions

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 9f17b91..cee2ba4 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -57,7 +57,7 @@ out_err:
 	return status;
 }
 
-static void nfs_delegation_claim_opens(struct inode *inode)
+static void nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid)
 {
 	struct nfs_inode *nfsi = NFS_I(inode);
 	struct nfs_open_context *ctx;
@@ -72,6 +72,8 @@ again:
 			continue;
 		if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 			continue;
+		if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0)
+			continue;
 		get_nfs_open_context(ctx);
 		spin_unlock(&inode->i_lock);
 		err = nfs4_open_delegation_recall(ctx, state);
@@ -170,33 +172,55 @@ static void nfs_msync_inode(struct inode *inode)
 /*
  * Basic procedure for returning a delegation to the server
  */
-int __nfs_inode_return_delegation(struct inode *inode)
+static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation)
 {
 	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
 	struct nfs_inode *nfsi = NFS_I(inode);
-	struct nfs_delegation *delegation;
-	int res = 0;
 
 	nfs_msync_inode(inode);
 	down_read(&clp->cl_sem);
 	/* Guard against new delegated open calls */
 	down_write(&nfsi->rwsem);
-	spin_lock(&clp->cl_lock);
-	delegation = nfsi->delegation;
-	if (delegation != NULL) {
-		list_del_init(&delegation->super_list);
-		nfsi->delegation = NULL;
-		nfsi->delegation_state = 0;
-	}
-	spin_unlock(&clp->cl_lock);
-	nfs_delegation_claim_opens(inode);
+	nfs_delegation_claim_opens(inode, &delegation->stateid);
 	up_write(&nfsi->rwsem);
 	up_read(&clp->cl_sem);
 	nfs_msync_inode(inode);
 
-	if (delegation != NULL)
-		res = nfs_do_return_delegation(inode, delegation);
-	return res;
+	return nfs_do_return_delegation(inode, delegation);
+}
+
+static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid)
+{
+	struct nfs_delegation *delegation = nfsi->delegation;
+
+	if (delegation == NULL)
+		goto nomatch;
+	if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data,
+				sizeof(delegation->stateid.data)) != 0)
+		goto nomatch;
+	list_del_init(&delegation->super_list);
+	nfsi->delegation = NULL;
+	nfsi->delegation_state = 0;
+	return delegation;
+nomatch:
+	return NULL;
+}
+
+int nfs_inode_return_delegation(struct inode *inode)
+{
+	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
+	struct nfs_inode *nfsi = NFS_I(inode);
+	struct nfs_delegation *delegation;
+	int err = 0;
+
+	if (nfsi->delegation_state != 0) {
+		spin_lock(&clp->cl_lock);
+		delegation = nfs_detach_delegation_locked(nfsi, NULL);
+		spin_unlock(&clp->cl_lock);
+		if (delegation != NULL)
+			err = __nfs_inode_return_delegation(inode, delegation);
+	}
+	return err;
 }
 
 /*
@@ -218,8 +242,9 @@ restart:
 		inode = igrab(delegation->inode);
 		if (inode == NULL)
 			continue;
+		nfs_detach_delegation_locked(NFS_I(inode), NULL);
 		spin_unlock(&clp->cl_lock);
-		nfs_inode_return_delegation(inode);
+		__nfs_inode_return_delegation(inode, delegation);
 		iput(inode);
 		goto restart;
 	}
@@ -243,8 +268,9 @@ restart:
 		inode = igrab(delegation->inode);
 		if (inode == NULL)
 			continue;
+		nfs_detach_delegation_locked(NFS_I(inode), NULL);
 		spin_unlock(&clp->cl_lock);
-		nfs_inode_return_delegation(inode);
+		__nfs_inode_return_delegation(inode, delegation);
 		iput(inode);
 		goto restart;
 	}
@@ -285,8 +311,9 @@ restart:
 		inode = igrab(delegation->inode);
 		if (inode == NULL)
 			continue;
+		nfs_detach_delegation_locked(NFS_I(inode), NULL);
 		spin_unlock(&clp->cl_lock);
-		nfs_inode_return_delegation(inode);
+		__nfs_inode_return_delegation(inode, delegation);
 		iput(inode);
 		goto restart;
 	}
@@ -316,21 +343,14 @@ static int recall_thread(void *data)
 	down_read(&clp->cl_sem);
 	down_write(&nfsi->rwsem);
 	spin_lock(&clp->cl_lock);
-	delegation = nfsi->delegation;
-	if (delegation != NULL && memcmp(delegation->stateid.data,
-				args->stateid->data,
-				sizeof(delegation->stateid.data)) == 0) {
-		list_del_init(&delegation->super_list);
-		nfsi->delegation = NULL;
-		nfsi->delegation_state = 0;
+	delegation = nfs_detach_delegation_locked(nfsi, args->stateid);
+	if (delegation != NULL)
 		args->result = 0;
-	} else {
-		delegation = NULL;
+	else
 		args->result = -ENOENT;
-	}
 	spin_unlock(&clp->cl_lock);
 	complete(&args->started);
-	nfs_delegation_claim_opens(inode);
+	nfs_delegation_claim_opens(inode, args->stateid);
 	up_write(&nfsi->rwsem);
 	up_read(&clp->cl_sem);
 	nfs_msync_inode(inode);