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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export.h (3408B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
      4 */
      5#ifndef NFSD_EXPORT_H
      6#define NFSD_EXPORT_H
      7
      8#include <linux/sunrpc/cache.h>
      9#include <linux/percpu_counter.h>
     10#include <uapi/linux/nfsd/export.h>
     11#include <linux/nfs4.h>
     12
     13struct knfsd_fh;
     14struct svc_fh;
     15struct svc_rqst;
     16
     17/*
     18 * FS Locations
     19 */
     20
     21#define MAX_FS_LOCATIONS	128
     22
     23struct nfsd4_fs_location {
     24	char *hosts; /* colon separated list of hosts */
     25	char *path;  /* slash separated list of path components */
     26};
     27
     28struct nfsd4_fs_locations {
     29	uint32_t locations_count;
     30	struct nfsd4_fs_location *locations;
     31/* If we're not actually serving this data ourselves (only providing a
     32 * list of replicas that do serve it) then we set "migrated": */
     33	int migrated;
     34};
     35
     36/*
     37 * We keep an array of pseudoflavors with the export, in order from most
     38 * to least preferred.  For the foreseeable future, we don't expect more
     39 * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
     40 * spkm3i, and spkm3p (and using all 8 at once should be rare).
     41 */
     42#define MAX_SECINFO_LIST	8
     43#define EX_UUID_LEN		16
     44
     45struct exp_flavor_info {
     46	u32	pseudoflavor;
     47	u32	flags;
     48};
     49
     50/* Per-export stats */
     51enum {
     52	EXP_STATS_FH_STALE,
     53	EXP_STATS_IO_READ,
     54	EXP_STATS_IO_WRITE,
     55	EXP_STATS_COUNTERS_NUM
     56};
     57
     58struct export_stats {
     59	time64_t		start_time;
     60	struct percpu_counter	counter[EXP_STATS_COUNTERS_NUM];
     61};
     62
     63struct svc_export {
     64	struct cache_head	h;
     65	struct auth_domain *	ex_client;
     66	int			ex_flags;
     67	struct path		ex_path;
     68	kuid_t			ex_anon_uid;
     69	kgid_t			ex_anon_gid;
     70	int			ex_fsid;
     71	unsigned char *		ex_uuid; /* 16 byte fsid */
     72	struct nfsd4_fs_locations ex_fslocs;
     73	uint32_t		ex_nflavors;
     74	struct exp_flavor_info	ex_flavors[MAX_SECINFO_LIST];
     75	u32			ex_layout_types;
     76	struct nfsd4_deviceid_map *ex_devid_map;
     77	struct cache_detail	*cd;
     78	struct rcu_head		ex_rcu;
     79	struct export_stats	ex_stats;
     80};
     81
     82/* an "export key" (expkey) maps a filehandlefragement to an
     83 * svc_export for a given client.  There can be several per export,
     84 * for the different fsid types.
     85 */
     86struct svc_expkey {
     87	struct cache_head	h;
     88
     89	struct auth_domain *	ek_client;
     90	int			ek_fsidtype;
     91	u32			ek_fsid[6];
     92
     93	struct path		ek_path;
     94	struct rcu_head		ek_rcu;
     95};
     96
     97#define EX_ISSYNC(exp)		(!((exp)->ex_flags & NFSEXP_ASYNC))
     98#define EX_NOHIDE(exp)		((exp)->ex_flags & NFSEXP_NOHIDE)
     99#define EX_WGATHER(exp)		((exp)->ex_flags & NFSEXP_GATHERED_WRITES)
    100
    101int nfsexp_flags(struct svc_rqst *rqstp, struct svc_export *exp);
    102__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp);
    103
    104/*
    105 * Function declarations
    106 */
    107int			nfsd_export_init(struct net *);
    108void			nfsd_export_shutdown(struct net *);
    109void			nfsd_export_flush(struct net *);
    110struct svc_export *	rqst_exp_get_by_name(struct svc_rqst *,
    111					     struct path *);
    112struct svc_export *	rqst_exp_parent(struct svc_rqst *,
    113					struct path *);
    114struct svc_export *	rqst_find_fsidzero_export(struct svc_rqst *);
    115int			exp_rootfh(struct net *, struct auth_domain *,
    116					char *path, struct knfsd_fh *, int maxsize);
    117__be32			exp_pseudoroot(struct svc_rqst *, struct svc_fh *);
    118__be32			nfserrno(int errno);
    119
    120static inline void exp_put(struct svc_export *exp)
    121{
    122	cache_put(&exp->h, exp->cd);
    123}
    124
    125static inline struct svc_export *exp_get(struct svc_export *exp)
    126{
    127	cache_get(&exp->h);
    128	return exp;
    129}
    130struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *);
    131
    132#endif /* NFSD_EXPORT_H */