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 13 struct knfsd_fh; 14 struct svc_fh; 15 struct svc_rqst; 16 17 /* 18 * FS Locations 19 */ 20 21 #define MAX_FS_LOCATIONS 128 22 23 struct nfsd4_fs_location { 24 char *hosts; /* colon separated list of hosts */ 25 char *path; /* slash separated list of path components */ 26 }; 27 28 struct 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 45 struct exp_flavor_info { 46 u32 pseudoflavor; 47 u32 flags; 48 }; 49 50 /* Per-export stats */ 51 enum { 52 EXP_STATS_FH_STALE, 53 EXP_STATS_IO_READ, 54 EXP_STATS_IO_WRITE, 55 EXP_STATS_COUNTERS_NUM 56 }; 57 58 struct export_stats { 59 time64_t start_time; 60 struct percpu_counter counter[EXP_STATS_COUNTERS_NUM]; 61 }; 62 63 struct 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 */ 86 struct 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) 100 101 int 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 */ 107 int nfsd_export_init(struct net *); 108 void nfsd_export_shutdown(struct net *); 109 void nfsd_export_flush(struct net *); 110 struct svc_export * rqst_exp_get_by_name(struct svc_rqst *, 111 struct path *); 112 struct svc_export * rqst_exp_parent(struct svc_rqst *, 113 struct path *); 114 struct svc_export * rqst_find_fsidzero_export(struct svc_rqst *); 115 int 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 *); 118 119 static inline void exp_put(struct svc_export *exp) 120 { 121 cache_put(&exp->h, exp->cd); 122 } 123 124 static inline struct svc_export *exp_get(struct svc_export *exp) 125 { 126 cache_get(&exp->h); 127 return exp; 128 } 129 struct svc_export * rqst_exp_find(struct svc_rqst *, int, u32 *); 130 131 #endif /* NFSD_EXPORT_H */ 132