1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * include/linux/nfs_ssc.h 4 * 5 * Author: Dai Ngo <dai.ngo@oracle.com> 6 * 7 * Copyright (c) 2020, Oracle and/or its affiliates. 8 */ 9 10 #include <linux/nfs_fs.h> 11 #include <linux/sunrpc/svc.h> 12 13 extern struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl; 14 15 /* 16 * NFS_V4 17 */ 18 struct nfs4_ssc_client_ops { 19 struct file *(*sco_open)(struct vfsmount *ss_mnt, 20 struct nfs_fh *src_fh, nfs4_stateid *stateid); 21 void (*sco_close)(struct file *filep); 22 }; 23 24 /* 25 * NFS_FS 26 */ 27 struct nfs_ssc_client_ops { 28 void (*sco_sb_deactive)(struct super_block *sb); 29 }; 30 31 struct nfs_ssc_client_ops_tbl { 32 const struct nfs4_ssc_client_ops *ssc_nfs4_ops; 33 const struct nfs_ssc_client_ops *ssc_nfs_ops; 34 }; 35 36 extern void nfs42_ssc_register_ops(void); 37 extern void nfs42_ssc_unregister_ops(void); 38 39 extern void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops); 40 extern void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops); 41 42 #ifdef CONFIG_NFSD_V4_2_INTER_SSC 43 static inline struct file *nfs42_ssc_open(struct vfsmount *ss_mnt, 44 struct nfs_fh *src_fh, nfs4_stateid *stateid) 45 { 46 if (nfs_ssc_client_tbl.ssc_nfs4_ops) 47 return (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_open)(ss_mnt, src_fh, stateid); 48 return ERR_PTR(-EIO); 49 } 50 51 static inline void nfs42_ssc_close(struct file *filep) 52 { 53 if (nfs_ssc_client_tbl.ssc_nfs4_ops) 54 (*nfs_ssc_client_tbl.ssc_nfs4_ops->sco_close)(filep); 55 } 56 57 struct nfsd4_ssc_umount_item { 58 struct list_head nsui_list; 59 bool nsui_busy; 60 /* 61 * nsui_refcnt inited to 2, 1 on list and 1 for consumer. Entry 62 * is removed when refcnt drops to 1 and nsui_expire expires. 63 */ 64 refcount_t nsui_refcnt; 65 unsigned long nsui_expire; 66 struct vfsmount *nsui_vfsmount; 67 char nsui_ipaddr[RPC_MAX_ADDRBUFLEN + 1]; 68 }; 69 #endif 70 71 /* 72 * NFS_FS 73 */ 74 extern void nfs_ssc_register(const struct nfs_ssc_client_ops *ops); 75 extern void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops); 76 77 static inline void nfs_do_sb_deactive(struct super_block *sb) 78 { 79 if (nfs_ssc_client_tbl.ssc_nfs_ops) 80 (*nfs_ssc_client_tbl.ssc_nfs_ops->sco_sb_deactive)(sb); 81 } 82