/* 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); }