cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nfs_ssc.h (2057B)

      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
     13extern struct nfs_ssc_client_ops_tbl nfs_ssc_client_tbl;
     14
     15/*
     16 * NFS_V4
     17 */
     18struct 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 */
     27struct nfs_ssc_client_ops {
     28	void (*sco_sb_deactive)(struct super_block *sb);
     29};
     30
     31struct 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
     36extern void nfs42_ssc_register_ops(void);
     37extern void nfs42_ssc_unregister_ops(void);
     38
     39extern void nfs42_ssc_register(const struct nfs4_ssc_client_ops *ops);
     40extern void nfs42_ssc_unregister(const struct nfs4_ssc_client_ops *ops);
     41
     42#ifdef CONFIG_NFSD_V4_2_INTER_SSC
     43static 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
     51static 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
     57struct 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];
     68};
     69#endif
     70
     71/*
     72 * NFS_FS
     73 */
     74extern void nfs_ssc_register(const struct nfs_ssc_client_ops *ops);
     75extern void nfs_ssc_unregister(const struct nfs_ssc_client_ops *ops);
     76
     77static 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}