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/* SPDX-License-Identifier: GPL-2.0 */
/*
* include/linux/nfs_ssc.h
*
* Author: Dai Ngo <dai.ngo@oracle.com>
*
* Copyright (c) 2020, Oracle and/or its affiliates.
*/
#include <linux/nfs_fs.h>
#include <linux/sunrpc/svc.h>
extern struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl;
/*
* NFS_V4
*/
struct nfs4_ssc_client_ops {
struct file *(*sco_open)(struct vfsmount *ss_mnt,
struct nfs_fh *src_fh, nfs4_stateid *stateid);
void (*sco_close)(struct file *filep);
};
/*
* NFS_FS
*/
struct nfs_ssc_client_ops {
void (*sco_sb_deactive)(struct super_block *sb);
};
struct nfs_ssc_client_ops_tbl {
const struct nfs4_ssc_client_ops *ssc_nfs4_ops;
const struct nfs_ssc_client_ops *ssc_nfs_ops;
};
extern void nfs42_ssc_register_ops(void);
extern void nfs42_ssc_unregister_ops(void);
extern void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops);
extern void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops);
#ifdef CONFIG_NFSD_V4_2_INTER_SSC
static inline struct file *nfs42_ssc_open(struct vfsmount *ss_mnt,
struct nfs_fh *src_fh, nfs4_stateid *stateid)
{
if (nfs_ssc_client_tbl.ssc_nfs4_ops)
return (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_open)(ss_mnt, src_fh, stateid);
return ERR_PTR(-EIO);
}
static inline void nfs42_ssc_close(struct file *filep)
{
if (nfs_ssc_client_tbl.ssc_nfs4_ops)
(*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_close)(filep);
}
struct nfsd4_ssc_umount_item {
struct list_head nsui_list;
bool nsui_busy;
/*
* nsui_refcnt inited to 2, 1 on list and 1 for consumer. Entry
* is removed when refcnt drops to 1 and nsui_expire expires.
*/
refcount_t nsui_refcnt;
unsigned long nsui_expire;
struct vfsmount *nsui_vfsmount;
char nsui_ipaddr[RPC_MAX_ADDRBUFLEN];
};
#endif
/*
* NFS_FS
*/
extern void nfs_ssc_register(const struct nfs_ssc_client_ops *ops);
extern void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops);
static inline void nfs_do_sb_deactive(struct super_block *sb)
{
if (nfs_ssc_client_tbl.ssc_nfs_ops)
(*nfs_ssc_client_tbl.ssc_nfs_ops->sco_sb_deactive)(sb);
}
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