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