1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * linux/fs/nfs/nfs4_fs.h 4 * 5 * Copyright (C) 2005 Trond Myklebust 6 * 7 * NFSv4-specific filesystem definitions and declarations 8 */ 9 10#ifndef __LINUX_FS_NFS_NFS4_FS_H 11#define __LINUX_FS_NFS_NFS4_FS_H 12 13#if defined(CONFIG_NFS_V4_2) 14#define NFS4_MAX_MINOR_VERSION 2 15#elif defined(CONFIG_NFS_V4_1) 16#define NFS4_MAX_MINOR_VERSION 1 17#else 18#define NFS4_MAX_MINOR_VERSION 0 19#endif 20 21#if IS_ENABLED(CONFIG_NFS_V4) 22 23#define NFS4_MAX_LOOP_ON_RECOVER (10) 24 25#include <linux/seqlock.h> 26 27struct idmap; 28 29enum nfs4_client_state { 30 NFS4CLNT_MANAGER_RUNNING = 0, 31 NFS4CLNT_CHECK_LEASE, 32 NFS4CLNT_LEASE_EXPIRED, 33 NFS4CLNT_RECLAIM_REBOOT, 34 NFS4CLNT_RECLAIM_NOGRACE, 35 NFS4CLNT_DELEGRETURN, 36 NFS4CLNT_SESSION_RESET, 37 NFS4CLNT_LEASE_CONFIRM, 38 NFS4CLNT_SERVER_SCOPE_MISMATCH, 39 NFS4CLNT_PURGE_STATE, 40 NFS4CLNT_BIND_CONN_TO_SESSION, 41 NFS4CLNT_MOVED, 42 NFS4CLNT_LEASE_MOVED, 43 NFS4CLNT_DELEGATION_EXPIRED, 44 NFS4CLNT_RUN_MANAGER, 45 NFS4CLNT_MANAGER_AVAILABLE, 46 NFS4CLNT_RECALL_RUNNING, 47 NFS4CLNT_RECALL_ANY_LAYOUT_READ, 48 NFS4CLNT_RECALL_ANY_LAYOUT_RW, 49 NFS4CLNT_DELEGRETURN_DELAYED, 50}; 51 52#define NFS4_RENEW_TIMEOUT 0x01 53#define NFS4_RENEW_DELEGATION_CB 0x02 54 55struct nfs_seqid_counter; 56struct nfs4_minor_version_ops { 57 u32 minor_version; 58 unsigned init_caps; 59 60 int (*init_client)(struct nfs_client *); 61 void (*shutdown_client)(struct nfs_client *); 62 bool (*match_stateid)(const nfs4_stateid *, 63 const nfs4_stateid *); 64 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *, 65 struct nfs_fsinfo *); 66 void (*free_lock_state)(struct nfs_server *, 67 struct nfs4_lock_state *); 68 int (*test_and_free_expired)(struct nfs_server *, 69 nfs4_stateid *, const struct cred *); 70 struct nfs_seqid * 71 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 72 void (*session_trunk)(struct rpc_clnt *clnt, 73 struct rpc_xprt *xprt, void *data); 74 const struct rpc_call_ops *call_sync_ops; 75 const struct nfs4_state_recovery_ops *reboot_recovery_ops; 76 const struct nfs4_state_recovery_ops *nograce_recovery_ops; 77 const struct nfs4_state_maintenance_ops *state_renewal_ops; 78 const struct nfs4_mig_recovery_ops *mig_recovery_ops; 79}; 80 81#define NFS_SEQID_CONFIRMED 1 82struct nfs_seqid_counter { 83 ktime_t create_time; 84 int owner_id; 85 int flags; 86 u32 counter; 87 spinlock_t lock; /* Protects the list */ 88 struct list_head list; /* Defines sequence of RPC calls */ 89 struct rpc_wait_queue wait; /* RPC call delay queue */ 90}; 91 92struct nfs_seqid { 93 struct nfs_seqid_counter *sequence; 94 struct list_head list; 95 struct rpc_task *task; 96}; 97 98static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status) 99{ 100 if (seqid_mutating_err(-status)) 101 seqid->flags |= NFS_SEQID_CONFIRMED; 102} 103 104/* 105 * NFS4 state_owners and lock_owners are simply labels for ordered 106 * sequences of RPC calls. Their sole purpose is to provide once-only 107 * semantics by allowing the server to identify replayed requests. 108 */ 109struct nfs4_state_owner { 110 struct nfs_server *so_server; 111 struct list_head so_lru; 112 unsigned long so_expires; 113 struct rb_node so_server_node; 114 115 const struct cred *so_cred; /* Associated cred */ 116 117 spinlock_t so_lock; 118 atomic_t so_count; 119 unsigned long so_flags; 120 struct list_head so_states; 121 struct nfs_seqid_counter so_seqid; 122 seqcount_spinlock_t so_reclaim_seqcount; 123 struct mutex so_delegreturn_mutex; 124}; 125 126enum { 127 NFS_OWNER_RECLAIM_REBOOT, 128 NFS_OWNER_RECLAIM_NOGRACE 129}; 130 131#define NFS_LOCK_NEW 0 132#define NFS_LOCK_RECLAIM 1 133#define NFS_LOCK_EXPIRED 2 134 135/* 136 * struct nfs4_state maintains the client-side state for a given 137 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). 138 * 139 * OPEN: 140 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, 141 * we need to know how many files are open for reading or writing on a 142 * given inode. This information too is stored here. 143 * 144 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) 145 */ 146 147struct nfs4_lock_state { 148 struct list_head ls_locks; /* Other lock stateids */ 149 struct nfs4_state * ls_state; /* Pointer to open state */ 150#define NFS_LOCK_INITIALIZED 0 151#define NFS_LOCK_LOST 1 152 unsigned long ls_flags; 153 struct nfs_seqid_counter ls_seqid; 154 nfs4_stateid ls_stateid; 155 refcount_t ls_count; 156 fl_owner_t ls_owner; 157}; 158 159/* bits for nfs4_state->flags */ 160enum { 161 LK_STATE_IN_USE, 162 NFS_DELEGATED_STATE, /* Current stateid is delegation */ 163 NFS_OPEN_STATE, /* OPEN stateid is set */ 164 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */ 165 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */ 166 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */ 167 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */ 168 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */ 169 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */ 170 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */ 171 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */ 172 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */ 173 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/ 174 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/ 175 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */ 176}; 177 178struct nfs4_state { 179 struct list_head open_states; /* List of states for the same state_owner */ 180 struct list_head inode_states; /* List of states for the same inode */ 181 struct list_head lock_states; /* List of subservient lock stateids */ 182 183 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 184 struct inode *inode; /* Pointer to the inode */ 185 186 unsigned long flags; /* Do we hold any locks? */ 187 spinlock_t state_lock; /* Protects the lock_states list */ 188 189 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 190 nfs4_stateid stateid; /* Current stateid: may be delegation */ 191 nfs4_stateid open_stateid; /* OPEN stateid */ 192 193 /* The following 3 fields are protected by owner->so_lock */ 194 unsigned int n_rdonly; /* Number of read-only references */ 195 unsigned int n_wronly; /* Number of write-only references */ 196 unsigned int n_rdwr; /* Number of read/write references */ 197 fmode_t state; /* State on the server (R,W, or RW) */ 198 refcount_t count; 199 200 wait_queue_head_t waitq; 201 struct rcu_head rcu_head; 202}; 203 204 205struct nfs4_exception { 206 struct nfs4_state *state; 207 struct inode *inode; 208 nfs4_stateid *stateid; 209 long timeout; 210 unsigned char task_is_privileged : 1; 211 unsigned char delay : 1, 212 recovering : 1, 213 retry : 1; 214 bool interruptible; 215}; 216 217struct nfs4_state_recovery_ops { 218 int owner_flag_bit; 219 int state_flag_bit; 220 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 221 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 222 int (*establish_clid)(struct nfs_client *, const struct cred *); 223 int (*reclaim_complete)(struct nfs_client *, const struct cred *); 224 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 225 const struct cred *); 226}; 227 228struct nfs4_opendata { 229 struct kref kref; 230 struct nfs_openargs o_arg; 231 struct nfs_openres o_res; 232 struct nfs_open_confirmargs c_arg; 233 struct nfs_open_confirmres c_res; 234 struct nfs4_string owner_name; 235 struct nfs4_string group_name; 236 struct nfs4_label *a_label; 237 struct nfs_fattr f_attr; 238 struct nfs4_label *f_label; 239 struct dentry *dir; 240 struct dentry *dentry; 241 struct nfs4_state_owner *owner; 242 struct nfs4_state *state; 243 struct iattr attrs; 244 struct nfs4_layoutget *lgp; 245 unsigned long timestamp; 246 bool rpc_done; 247 bool file_created; 248 bool is_recover; 249 bool cancelled; 250 int rpc_status; 251}; 252 253struct nfs4_add_xprt_data { 254 struct nfs_client *clp; 255 const struct cred *cred; 256}; 257 258struct nfs4_state_maintenance_ops { 259 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned); 260 const struct cred * (*get_state_renewal_cred)(struct nfs_client *); 261 int (*renew_lease)(struct nfs_client *, const struct cred *); 262}; 263 264struct nfs4_mig_recovery_ops { 265 int (*get_locations)(struct inode *, struct nfs4_fs_locations *, 266 struct page *, const struct cred *); 267 int (*fsid_present)(struct inode *, const struct cred *); 268}; 269 270extern const struct dentry_operations nfs4_dentry_operations; 271 272/* dir.c */ 273int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 274 unsigned, umode_t); 275 276/* fs_context.c */ 277extern struct file_system_type nfs4_fs_type; 278 279/* nfs4namespace.c */ 280struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 281 const struct qstr *); 282int nfs4_submount(struct fs_context *, struct nfs_server *); 283int nfs4_replace_transport(struct nfs_server *server, 284 const struct nfs4_fs_locations *locations); 285size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr *sa, 286 size_t salen, struct net *net, int port); 287/* nfs4proc.c */ 288extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 289extern int nfs4_async_handle_error(struct rpc_task *task, 290 struct nfs_server *server, 291 struct nfs4_state *state, long *timeout); 292extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 293 struct rpc_message *, struct nfs4_sequence_args *, 294 struct nfs4_sequence_res *, int); 295extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 296extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *); 297extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *); 298extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 299extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred); 300extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred); 301extern int nfs4_destroy_clientid(struct nfs_client *clp); 302extern int nfs4_init_clientid(struct nfs_client *, const struct cred *); 303extern int nfs41_init_clientid(struct nfs_client *, const struct cred *); 304extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 305extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 306extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 307 struct nfs4_fs_locations *, struct page *); 308extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *, 309 struct page *page, const struct cred *); 310extern int nfs4_proc_fsid_present(struct inode *, const struct cred *); 311extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, 312 struct dentry *, 313 struct nfs_fh *, 314 struct nfs_fattr *); 315extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 316extern const struct xattr_handler *nfs4_xattr_handlers[]; 317extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 318 const struct nfs_open_context *ctx, 319 const struct nfs_lock_context *l_ctx, 320 fmode_t fmode); 321extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 322 struct nfs_fattr *fattr, struct nfs4_label *label, 323 struct inode *inode); 324extern int update_open_stateid(struct nfs4_state *state, 325 const nfs4_stateid *open_stateid, 326 const nfs4_stateid *deleg_stateid, 327 fmode_t fmode); 328 329extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 330 struct nfs_fsinfo *fsinfo); 331extern void nfs4_update_changeattr(struct inode *dir, 332 struct nfs4_change_info *cinfo, 333 unsigned long timestamp, 334 unsigned long cache_validity); 335extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 336 struct page **pages); 337 338#if defined(CONFIG_NFS_V4_1) 339extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 340extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 341extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 342extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 343 bool sync); 344extern int nfs4_detect_session_trunking(struct nfs_client *clp, 345 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 346 347static inline bool 348is_ds_only_client(struct nfs_client *clp) 349{ 350 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 351 EXCHGID4_FLAG_USE_PNFS_DS; 352} 353 354static inline bool 355is_ds_client(struct nfs_client *clp) 356{ 357 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 358} 359 360static inline bool 361_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 362 struct rpc_clnt **clntp, struct rpc_message *msg) 363{ 364 rpc_authflavor_t flavor; 365 366 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 367 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 368 /* Using machine creds for cleanup operations 369 * is only relevent if the client credentials 370 * might expire. So don't bother for 371 * RPC_AUTH_UNIX. If file was only exported to 372 * sec=sys, the PUTFH would fail anyway. 373 */ 374 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 375 return false; 376 } 377 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 378 msg->rpc_cred = rpc_machine_cred(); 379 380 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 381 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 382 flavor != RPC_AUTH_GSS_KRB5P); 383 *clntp = clp->cl_rpcclient; 384 385 return true; 386 } 387 return false; 388} 389 390/* 391 * Function responsible for determining if an rpc_message should use the 392 * machine cred under SP4_MACH_CRED and if so switching the credential and 393 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 394 * Should be called before rpc_call_sync/rpc_call_async. 395 */ 396static inline void 397nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 398 struct rpc_clnt **clntp, struct rpc_message *msg) 399{ 400 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 401} 402 403/* 404 * Special wrapper to nfs4_state_protect for write. 405 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 406 * that use machine cred use NFS_FILE_SYNC. 407 */ 408static inline void 409nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 410 struct rpc_message *msg, struct nfs_pgio_header *hdr) 411{ 412 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 413 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 414 hdr->args.stable = NFS_FILE_SYNC; 415} 416#else /* CONFIG_NFS_v4_1 */ 417static inline bool 418is_ds_only_client(struct nfs_client *clp) 419{ 420 return false; 421} 422 423static inline bool 424is_ds_client(struct nfs_client *clp) 425{ 426 return false; 427} 428 429static inline void 430nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 431 struct rpc_clnt **clntp, struct rpc_message *msg) 432{ 433} 434 435static inline void 436nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 437 struct rpc_message *msg, struct nfs_pgio_header *hdr) 438{ 439} 440#endif /* CONFIG_NFS_V4_1 */ 441 442extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 443 444extern const u32 nfs4_fattr_bitmap[3]; 445extern const u32 nfs4_statfs_bitmap[3]; 446extern const u32 nfs4_pathconf_bitmap[3]; 447extern const u32 nfs4_fsinfo_bitmap[3]; 448extern const u32 nfs4_fs_locations_bitmap[3]; 449 450void nfs40_shutdown_client(struct nfs_client *); 451void nfs41_shutdown_client(struct nfs_client *); 452int nfs40_init_client(struct nfs_client *); 453int nfs41_init_client(struct nfs_client *); 454void nfs4_free_client(struct nfs_client *); 455 456struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 457 458/* nfs4renewd.c */ 459extern void nfs4_schedule_state_renewal(struct nfs_client *); 460extern void nfs4_renewd_prepare_shutdown(struct nfs_server *); 461extern void nfs4_kill_renewd(struct nfs_client *); 462extern void nfs4_renew_state(struct work_struct *); 463extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease); 464 465 466/* nfs4state.c */ 467extern const nfs4_stateid current_stateid; 468 469const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 470const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 471const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 472int nfs4_discover_server_trunking(struct nfs_client *clp, 473 struct nfs_client **); 474int nfs40_discover_server_trunking(struct nfs_client *clp, 475 struct nfs_client **, const struct cred *); 476#if defined(CONFIG_NFS_V4_1) 477int nfs41_discover_server_trunking(struct nfs_client *clp, 478 struct nfs_client **, const struct cred *); 479extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 480extern void nfs41_notify_server(struct nfs_client *); 481bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 482 struct nfs41_server_owner *o2); 483#else 484static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 485{ 486} 487#endif /* CONFIG_NFS_V4_1 */ 488 489extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 490extern void nfs4_put_state_owner(struct nfs4_state_owner *); 491extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 492extern void nfs4_free_state_owners(struct list_head *head); 493extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 494extern void nfs4_put_open_state(struct nfs4_state *); 495extern void nfs4_close_state(struct nfs4_state *, fmode_t); 496extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 497extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 498extern void nfs_inode_find_state_and_recover(struct inode *inode, 499 const nfs4_stateid *stateid); 500extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 501extern void nfs4_schedule_lease_recovery(struct nfs_client *); 502extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 503extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 504extern void nfs4_schedule_state_manager(struct nfs_client *); 505extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 506extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 507extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 508extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 509extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 510extern void nfs41_handle_server_scope(struct nfs_client *, 511 struct nfs41_server_scope **); 512extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 513extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 514extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 515 const struct nfs_lock_context *, nfs4_stateid *, 516 const struct cred **); 517extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 518 struct nfs4_state *state); 519 520extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 521extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 522extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 523extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 524extern void nfs_release_seqid(struct nfs_seqid *seqid); 525extern void nfs_free_seqid(struct nfs_seqid *seqid); 526extern int nfs4_setup_sequence(struct nfs_client *client, 527 struct nfs4_sequence_args *args, 528 struct nfs4_sequence_res *res, 529 struct rpc_task *task); 530extern int nfs4_sequence_done(struct rpc_task *task, 531 struct nfs4_sequence_res *res); 532 533extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 534extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 535extern const nfs4_stateid zero_stateid; 536extern const nfs4_stateid invalid_stateid; 537 538/* nfs4super.c */ 539struct nfs_mount_info; 540extern struct nfs_subversion nfs_v4; 541extern bool nfs4_disable_idmapping; 542extern unsigned short max_session_slots; 543extern unsigned short max_session_cb_slots; 544extern unsigned short send_implementation_id; 545extern bool recover_lost_locks; 546 547#define NFS4_CLIENT_ID_UNIQ_LEN (64) 548extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 549 550extern int nfs4_try_get_tree(struct fs_context *); 551extern int nfs4_get_referral_tree(struct fs_context *); 552 553/* nfs4sysctl.c */ 554#ifdef CONFIG_SYSCTL 555int nfs4_register_sysctl(void); 556void nfs4_unregister_sysctl(void); 557#else 558static inline int nfs4_register_sysctl(void) 559{ 560 return 0; 561} 562 563static inline void nfs4_unregister_sysctl(void) 564{ 565} 566#endif 567 568/* nfs4xdr.c */ 569extern const struct rpc_procinfo nfs4_procedures[]; 570 571#ifdef CONFIG_NFS_V4_2 572extern const u32 nfs42_maxsetxattr_overhead; 573extern const u32 nfs42_maxgetxattr_overhead; 574extern const u32 nfs42_maxlistxattrs_overhead; 575#endif 576 577struct nfs4_mount_data; 578 579/* callback_xdr.c */ 580extern const struct svc_version nfs4_callback_version1; 581extern const struct svc_version nfs4_callback_version4; 582 583static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 584{ 585 memcpy(dst->data, src->data, sizeof(dst->data)); 586 dst->type = src->type; 587} 588 589static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 590{ 591 if (dst->type != src->type) 592 return false; 593 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 594} 595 596static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 597{ 598 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 599} 600 601static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 602{ 603 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 604} 605 606static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2) 607{ 608 u32 seq1 = be32_to_cpu(s1->seqid); 609 u32 seq2 = be32_to_cpu(s2->seqid); 610 611 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU); 612} 613 614static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 615{ 616 return nfs4_stateid_match_other(dst, src) && 617 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 618} 619 620static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 621{ 622 u32 seqid = be32_to_cpu(s1->seqid); 623 624 if (++seqid == 0) 625 ++seqid; 626 s1->seqid = cpu_to_be32(seqid); 627} 628 629static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 630{ 631 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 632} 633 634static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 635 const nfs4_stateid *stateid) 636{ 637 return test_bit(NFS_OPEN_STATE, &state->flags) && 638 nfs4_stateid_match_other(&state->open_stateid, stateid); 639} 640 641/* nfs42xattr.c */ 642#ifdef CONFIG_NFS_V4_2 643extern int __init nfs4_xattr_cache_init(void); 644extern void nfs4_xattr_cache_exit(void); 645extern void nfs4_xattr_cache_add(struct inode *inode, const char *name, 646 const char *buf, struct page **pages, 647 ssize_t buflen); 648extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name); 649extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name, 650 char *buf, ssize_t buflen); 651extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf, 652 ssize_t buflen); 653extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf, 654 ssize_t buflen); 655extern void nfs4_xattr_cache_zap(struct inode *inode); 656#else 657static inline void nfs4_xattr_cache_zap(struct inode *inode) 658{ 659} 660#endif /* CONFIG_NFS_V4_2 */ 661 662#else /* CONFIG_NFS_V4 */ 663 664#define nfs4_close_state(a, b) do { } while (0) 665#define nfs4_close_sync(a, b) do { } while (0) 666#define nfs4_state_protect(a, b, c, d) do { } while (0) 667#define nfs4_state_protect_write(a, b, c, d) do { } while (0) 668 669 670#endif /* CONFIG_NFS_V4 */ 671#endif /* __LINUX_FS_NFS_NFS4_FS.H */ 672