1 files changed, 92 insertions, 0 deletions
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h
new file mode 100644
index 000000000..26f57a99d
--- /dev/null
+++ b/fs/nfs/delegation.h
@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * linux/fs/nfs/delegation.h
+ *
+ * Copyright (c) Trond Myklebust
+ *
+ * Definitions pertaining to NFS delegated files
+ */
+#ifndef FS_NFS_DELEGATION_H
+#define FS_NFS_DELEGATION_H
+
+#if IS_ENABLED(CONFIG_NFS_V4)
+/*
+ * NFSv4 delegation
+ */
+struct nfs_delegation {
+	struct list_head super_list;
+	const struct cred *cred;
+	struct inode *inode;
+	nfs4_stateid stateid;
+	fmode_t type;
+	unsigned long pagemod_limit;
+	__u64 change_attr;
+	unsigned long flags;
+	refcount_t refcount;
+	spinlock_t lock;
+	struct rcu_head rcu;
+};
+
+enum {
+	NFS_DELEGATION_NEED_RECLAIM = 0,
+	NFS_DELEGATION_RETURN,
+	NFS_DELEGATION_RETURN_IF_CLOSED,
+	NFS_DELEGATION_REFERENCED,
+	NFS_DELEGATION_RETURNING,
+	NFS_DELEGATION_REVOKED,
+	NFS_DELEGATION_TEST_EXPIRED,
+	NFS_DELEGATION_INODE_FREEING,
+	NFS_DELEGATION_RETURN_DELAYED,
+};
+
+int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
+		fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
+void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
+		fmode_t type, const nfs4_stateid *stateid, unsigned long pagemod_limit);
+int nfs4_inode_return_delegation(struct inode *inode);
+void nfs4_inode_return_delegation_on_close(struct inode *inode);
+int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
+void nfs_inode_evict_delegation(struct inode *inode);
+
+struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
+void nfs_server_return_all_delegations(struct nfs_server *);
+void nfs_expire_all_delegations(struct nfs_client *clp);
+void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags);
+void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
+int nfs_client_return_marked_delegations(struct nfs_client *clp);
+int nfs_delegations_present(struct nfs_client *clp);
+void nfs_remove_bad_delegation(struct inode *inode, const nfs4_stateid *stateid);
+void nfs_delegation_mark_returned(struct inode *inode, const nfs4_stateid *stateid);
+
+void nfs_delegation_mark_reclaim(struct nfs_client *clp);
+void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
+
+void nfs_mark_test_expired_all_delegations(struct nfs_client *clp);
+void nfs_test_expired_all_delegations(struct nfs_client *clp);
+void nfs_reap_expired_delegations(struct nfs_client *clp);
+
+/* NFSv4 delegation-related procedures */
+int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync);
+int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid);
+int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid);
+bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags, nfs4_stateid *dst, const struct cred **cred);
+bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode);
+
+struct nfs_delegation *nfs4_get_valid_delegation(const struct inode *inode);
+void nfs_mark_delegation_referenced(struct nfs_delegation *delegation);
+int nfs4_have_delegation(struct inode *inode, fmode_t flags);
+int nfs4_check_delegation(struct inode *inode, fmode_t flags);
+bool nfs4_delegation_flush_on_close(const struct inode *inode);
+void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
+		const nfs4_stateid *stateid);
+int nfs4_inode_make_writeable(struct inode *inode);
+
+#endif
+
+static inline int nfs_have_delegated_attributes(struct inode *inode)
+{
+	return NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) &&
+		!(NFS_I(inode)->cache_validity & NFS_INO_REVAL_FORCED);
+}
+
+#endif