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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2024 Mike Snitzer <snitzer@hammerspace.com>
* Copyright (C) 2024 NeilBrown <neilb@suse.de>
*/
#ifndef __LINUX_NFSLOCALIO_H
#define __LINUX_NFSLOCALIO_H
/* nfsd_file structure is purposely kept opaque to NFS client */
struct nfsd_file;
#if IS_ENABLED(CONFIG_NFS_LOCALIO)
#include <linux/module.h>
#include <linux/list.h>
#include <linux/uuid.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/nfs.h>
#include <net/net_namespace.h>
/*
* Useful to allow a client to negotiate if localio
* possible with its server.
*
* See Documentation/filesystems/nfs/localio.rst for more detail.
*/
typedef struct {
uuid_t uuid;
struct list_head list;
struct net __rcu *net; /* nfsd's network namespace */
struct auth_domain *dom; /* auth_domain for localio */
} nfs_uuid_t;
void nfs_uuid_begin(nfs_uuid_t *);
void nfs_uuid_end(nfs_uuid_t *);
void nfs_uuid_is_local(const uuid_t *, struct list_head *,
struct net *, struct auth_domain *, struct module *);
void nfs_uuid_invalidate_clients(struct list_head *list);
void nfs_uuid_invalidate_one_client(nfs_uuid_t *nfs_uuid);
/* localio needs to map filehandle -> struct nfsd_file */
extern struct nfsd_file *
nfsd_open_local_fh(struct net *, struct auth_domain *, struct rpc_clnt *,
const struct cred *, const struct nfs_fh *,
const fmode_t) __must_hold(rcu);
struct nfsd_localio_operations {
bool (*nfsd_serv_try_get)(struct net *);
void (*nfsd_serv_put)(struct net *);
struct nfsd_file *(*nfsd_open_local_fh)(struct net *,
struct auth_domain *,
struct rpc_clnt *,
const struct cred *,
const struct nfs_fh *,
const fmode_t);
void (*nfsd_file_put_local)(struct nfsd_file *);
struct file *(*nfsd_file_file)(struct nfsd_file *);
} ____cacheline_aligned;
extern void nfsd_localio_ops_init(void);
extern const struct nfsd_localio_operations *nfs_to;
struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *,
struct rpc_clnt *, const struct cred *,
const struct nfs_fh *, const fmode_t);
static inline void nfs_to_nfsd_file_put_local(struct nfsd_file *localio)
{
/*
* Once reference to nfsd_serv is dropped, NFSD could be
* unloaded, so ensure safe return from nfsd_file_put_local()
* by always taking RCU.
*/
rcu_read_lock();
nfs_to->nfsd_file_put_local(localio);
rcu_read_unlock();
}
#else /* CONFIG_NFS_LOCALIO */
static inline void nfsd_localio_ops_init(void)
{
}
static inline void nfs_to_nfsd_file_put_local(struct nfsd_file *localio)
{
}
#endif /* CONFIG_NFS_LOCALIO */
#endif /* __LINUX_NFSLOCALIO_H */
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