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#include <linux/filelock.h> 27 28struct idmap; 29 30enum nfs4_client_state { 31 NFS4CLNT_MANAGER_RUNNING = 0, 32 NFS4CLNT_CHECK_LEASE, 33 NFS4CLNT_LEASE_EXPIRED, 34 NFS4CLNT_RECLAIM_REBOOT, 35 NFS4CLNT_RECLAIM_NOGRACE, 36 NFS4CLNT_DELEGRETURN, 37 NFS4CLNT_SESSION_RESET, 38 NFS4CLNT_LEASE_CONFIRM, 39 NFS4CLNT_SERVER_SCOPE_MISMATCH, 40 NFS4CLNT_PURGE_STATE, 41 NFS4CLNT_BIND_CONN_TO_SESSION, 42 NFS4CLNT_MOVED, 43 NFS4CLNT_LEASE_MOVED, 44 NFS4CLNT_DELEGATION_EXPIRED, 45 NFS4CLNT_RUN_MANAGER, 46 NFS4CLNT_MANAGER_AVAILABLE, 47 NFS4CLNT_RECALL_RUNNING, 48 NFS4CLNT_RECALL_ANY_LAYOUT_READ, 49 NFS4CLNT_RECALL_ANY_LAYOUT_RW, 50 NFS4CLNT_DELEGRETURN_DELAYED, 51}; 52 53#define NFS4_RENEW_TIMEOUT 0x01 54#define NFS4_RENEW_DELEGATION_CB 0x02 55 56struct nfs_seqid_counter; 57struct nfs4_minor_version_ops { 58 u32 minor_version; 59 unsigned init_caps; 60 61 int (*init_client)(struct nfs_client *); 62 void (*shutdown_client)(struct nfs_client *); 63 bool (*match_stateid)(const nfs4_stateid *, 64 const nfs4_stateid *); 65 int (*find_root_sec)(struct nfs_server *, struct nfs_fh *, 66 struct nfs_fsinfo *); 67 void (*free_lock_state)(struct nfs_server *, 68 struct nfs4_lock_state *); 69 int (*test_and_free_expired)(struct nfs_server *, 70 nfs4_stateid *, const struct cred *); 71 struct nfs_seqid * 72 (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); 73 void (*session_trunk)(struct rpc_clnt *clnt, 74 struct rpc_xprt *xprt, void *data); 75 const struct rpc_call_ops *call_sync_ops; 76 const struct nfs4_state_recovery_ops *reboot_recovery_ops; 77 const struct nfs4_state_recovery_ops *nograce_recovery_ops; 78 const struct nfs4_state_maintenance_ops *state_renewal_ops; 79 const struct nfs4_mig_recovery_ops *mig_recovery_ops; 80}; 81 82#define NFS_SEQID_CONFIRMED 1 83struct nfs_seqid_counter { 84 ktime_t create_time; 85 int owner_id; 86 int flags; 87 u32 counter; 88 spinlock_t lock; /* Protects the list */ 89 struct list_head list; /* Defines sequence of RPC calls */ 90 struct rpc_wait_queue wait; /* RPC call delay queue */ 91}; 92 93struct nfs_seqid { 94 struct nfs_seqid_counter *sequence; 95 struct list_head list; 96 struct rpc_task *task; 97}; 98 99static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status) 100{ 101 if (seqid_mutating_err(-status)) 102 seqid->flags |= NFS_SEQID_CONFIRMED; 103} 104 105/* 106 * NFS4 state_owners and lock_owners are simply labels for ordered 107 * sequences of RPC calls. Their sole purpose is to provide once-only 108 * semantics by allowing the server to identify replayed requests. 109 */ 110struct nfs4_state_owner { 111 struct nfs_server *so_server; 112 struct list_head so_lru; 113 unsigned long so_expires; 114 struct rb_node so_server_node; 115 116 const struct cred *so_cred; /* Associated cred */ 117 118 spinlock_t so_lock; 119 atomic_t so_count; 120 unsigned long so_flags; 121 struct list_head so_states; 122 struct nfs_seqid_counter so_seqid; 123 seqcount_spinlock_t so_reclaim_seqcount; 124 struct mutex so_delegreturn_mutex; 125}; 126 127enum { 128 NFS_OWNER_RECLAIM_REBOOT, 129 NFS_OWNER_RECLAIM_NOGRACE 130}; 131 132#define NFS_LOCK_NEW 0 133#define NFS_LOCK_RECLAIM 1 134#define NFS_LOCK_EXPIRED 2 135 136/* 137 * struct nfs4_state maintains the client-side state for a given 138 * (state_owner,inode) tuple (OPEN) or state_owner (LOCK). 139 * 140 * OPEN: 141 * In order to know when to OPEN_DOWNGRADE or CLOSE the state on the server, 142 * we need to know how many files are open for reading or writing on a 143 * given inode. This information too is stored here. 144 * 145 * LOCK: one nfs4_state (LOCK) to hold the lock stateid nfs4_state(OPEN) 146 */ 147 148struct nfs4_lock_state { 149 struct list_head ls_locks; /* Other lock stateids */ 150 struct nfs4_state * ls_state; /* Pointer to open state */ 151#define NFS_LOCK_INITIALIZED 0 152#define NFS_LOCK_LOST 1 153#define NFS_LOCK_UNLOCKING 2 154 unsigned long ls_flags; 155 struct nfs_seqid_counter ls_seqid; 156 nfs4_stateid ls_stateid; 157 refcount_t ls_count; 158 fl_owner_t ls_owner; 159}; 160 161/* bits for nfs4_state->flags */ 162enum { 163 LK_STATE_IN_USE, 164 NFS_DELEGATED_STATE, /* Current stateid is delegation */ 165 NFS_OPEN_STATE, /* OPEN stateid is set */ 166 NFS_O_RDONLY_STATE, /* OPEN stateid has read-only state */ 167 NFS_O_WRONLY_STATE, /* OPEN stateid has write-only state */ 168 NFS_O_RDWR_STATE, /* OPEN stateid has read/write state */ 169 NFS_STATE_RECLAIM_REBOOT, /* OPEN stateid server rebooted */ 170 NFS_STATE_RECLAIM_NOGRACE, /* OPEN stateid needs to recover state */ 171 NFS_STATE_POSIX_LOCKS, /* Posix locks are supported */ 172 NFS_STATE_RECOVERY_FAILED, /* OPEN stateid state recovery failed */ 173 NFS_STATE_MAY_NOTIFY_LOCK, /* server may CB_NOTIFY_LOCK */ 174 NFS_STATE_CHANGE_WAIT, /* A state changing operation is outstanding */ 175 NFS_CLNT_DST_SSC_COPY_STATE, /* dst server open state on client*/ 176 NFS_CLNT_SRC_SSC_COPY_STATE, /* src server open state on client*/ 177 NFS_SRV_SSC_COPY_STATE, /* ssc state on the dst server */ 178}; 179 180struct nfs4_state { 181 struct list_head open_states; /* List of states for the same state_owner */ 182 struct list_head inode_states; /* List of states for the same inode */ 183 struct list_head lock_states; /* List of subservient lock stateids */ 184 185 struct nfs4_state_owner *owner; /* Pointer to the open owner */ 186 struct inode *inode; /* Pointer to the inode */ 187 188 unsigned long flags; /* Do we hold any locks? */ 189 spinlock_t state_lock; /* Protects the lock_states list */ 190 191 seqlock_t seqlock; /* Protects the stateid/open_stateid */ 192 nfs4_stateid stateid; /* Current stateid: may be delegation */ 193 nfs4_stateid open_stateid; /* OPEN stateid */ 194 195 /* The following 3 fields are protected by owner->so_lock */ 196 unsigned int n_rdonly; /* Number of read-only references */ 197 unsigned int n_wronly; /* Number of write-only references */ 198 unsigned int n_rdwr; /* Number of read/write references */ 199 fmode_t state; /* State on the server (R,W, or RW) */ 200 refcount_t count; 201 202 wait_queue_head_t waitq; 203 struct rcu_head rcu_head; 204}; 205 206 207struct nfs4_exception { 208 struct nfs4_state *state; 209 struct inode *inode; 210 nfs4_stateid *stateid; 211 long timeout; 212 unsigned char task_is_privileged : 1; 213 unsigned char delay : 1, 214 recovering : 1, 215 retry : 1; 216 bool interruptible; 217}; 218 219struct nfs4_state_recovery_ops { 220 int owner_flag_bit; 221 int state_flag_bit; 222 int (*recover_open)(struct nfs4_state_owner *, struct nfs4_state *); 223 int (*recover_lock)(struct nfs4_state *, struct file_lock *); 224 int (*establish_clid)(struct nfs_client *, const struct cred *); 225 int (*reclaim_complete)(struct nfs_client *, const struct cred *); 226 int (*detect_trunking)(struct nfs_client *, struct nfs_client **, 227 const struct cred *); 228}; 229 230struct nfs4_opendata { 231 struct kref kref; 232 struct nfs_openargs o_arg; 233 struct nfs_openres o_res; 234 struct nfs_open_confirmargs c_arg; 235 struct nfs_open_confirmres c_res; 236 struct nfs4_string owner_name; 237 struct nfs4_string group_name; 238 struct nfs4_label *a_label; 239 struct nfs_fattr f_attr; 240 struct dentry *dir; 241 struct dentry *dentry; 242 struct nfs4_state_owner *owner; 243 struct nfs4_state *state; 244 struct iattr attrs; 245 struct nfs4_layoutget *lgp; 246 unsigned long timestamp; 247 bool rpc_done; 248 bool file_created; 249 bool is_recover; 250 bool cancelled; 251 int rpc_status; 252}; 253 254struct nfs4_add_xprt_data { 255 struct nfs_client *clp; 256 const struct cred *cred; 257}; 258 259struct nfs4_state_maintenance_ops { 260 int (*sched_state_renewal)(struct nfs_client *, const struct cred *, unsigned); 261 const struct cred * (*get_state_renewal_cred)(struct nfs_client *); 262 int (*renew_lease)(struct nfs_client *, const struct cred *); 263}; 264 265struct nfs4_mig_recovery_ops { 266 int (*get_locations)(struct nfs_server *, struct nfs_fh *, 267 struct nfs4_fs_locations *, struct page *, const struct cred *); 268 int (*fsid_present)(struct inode *, const struct cred *); 269}; 270 271extern const struct dentry_operations nfs4_dentry_operations; 272 273/* dir.c */ 274int nfs_atomic_open(struct inode *, struct dentry *, struct file *, 275 unsigned, umode_t); 276 277/* fs_context.c */ 278extern struct file_system_type nfs4_fs_type; 279 280/* nfs4namespace.c */ 281struct rpc_clnt *nfs4_negotiate_security(struct rpc_clnt *, struct inode *, 282 const struct qstr *); 283int nfs4_submount(struct fs_context *, struct nfs_server *); 284int nfs4_replace_transport(struct nfs_server *server, 285 const struct nfs4_fs_locations *locations); 286size_t nfs_parse_server_name(char *string, size_t len, struct sockaddr_storage *ss, 287 size_t salen, struct net *net, int port); 288/* nfs4proc.c */ 289extern int nfs4_handle_exception(struct nfs_server *, int, struct nfs4_exception *); 290extern int nfs4_async_handle_error(struct rpc_task *task, 291 struct nfs_server *server, 292 struct nfs4_state *state, long *timeout); 293extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, 294 struct rpc_message *, struct nfs4_sequence_args *, 295 struct nfs4_sequence_res *, int); 296extern void nfs4_init_sequence(struct nfs4_sequence_args *, struct nfs4_sequence_res *, int, int); 297extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, const struct cred *, struct nfs4_setclientid_res *); 298extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, const struct cred *); 299extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); 300extern int nfs4_proc_bind_conn_to_session(struct nfs_client *, const struct cred *cred); 301extern int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred); 302extern int nfs4_destroy_clientid(struct nfs_client *clp); 303extern int nfs4_init_clientid(struct nfs_client *, const struct cred *); 304extern int nfs41_init_clientid(struct nfs_client *, const struct cred *); 305extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait); 306extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle); 307extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *, 308 struct nfs4_fs_locations *, struct page *); 309extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *, 310 struct nfs4_fs_locations *, 311 struct page *page, const struct cred *); 312extern int nfs4_proc_fsid_present(struct inode *, const struct cred *); 313extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *, 314 struct dentry *, 315 struct nfs_fh *, 316 struct nfs_fattr *); 317extern int nfs4_proc_secinfo(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *); 318extern const struct xattr_handler *nfs4_xattr_handlers[]; 319extern int nfs4_set_rw_stateid(nfs4_stateid *stateid, 320 const struct nfs_open_context *ctx, 321 const struct nfs_lock_context *l_ctx, 322 fmode_t fmode); 323extern void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[], 324 struct inode *inode, unsigned long cache_validity); 325extern int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, 326 struct nfs_fattr *fattr, struct inode *inode); 327extern int update_open_stateid(struct nfs4_state *state, 328 const nfs4_stateid *open_stateid, 329 const nfs4_stateid *deleg_stateid, 330 fmode_t fmode); 331extern int nfs4_proc_setlease(struct file *file, int arg, 332 struct file_lock **lease, void **priv); 333extern int nfs4_proc_get_lease_time(struct nfs_client *clp, 334 struct nfs_fsinfo *fsinfo); 335extern void nfs4_update_changeattr(struct inode *dir, 336 struct nfs4_change_info *cinfo, 337 unsigned long timestamp, 338 unsigned long cache_validity); 339extern int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen, 340 struct page **pages); 341 342#if defined(CONFIG_NFS_V4_1) 343extern int nfs41_sequence_done(struct rpc_task *, struct nfs4_sequence_res *); 344extern int nfs4_proc_create_session(struct nfs_client *, const struct cred *); 345extern int nfs4_proc_destroy_session(struct nfs4_session *, const struct cred *); 346extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, 347 bool sync); 348extern int nfs4_detect_session_trunking(struct nfs_client *clp, 349 struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); 350 351static inline bool 352is_ds_only_client(struct nfs_client *clp) 353{ 354 return (clp->cl_exchange_flags & EXCHGID4_FLAG_MASK_PNFS) == 355 EXCHGID4_FLAG_USE_PNFS_DS; 356} 357 358static inline bool 359is_ds_client(struct nfs_client *clp) 360{ 361 return clp->cl_exchange_flags & EXCHGID4_FLAG_USE_PNFS_DS; 362} 363 364static inline bool 365_nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 366 struct rpc_clnt **clntp, struct rpc_message *msg) 367{ 368 rpc_authflavor_t flavor; 369 370 if (sp4_mode == NFS_SP4_MACH_CRED_CLEANUP || 371 sp4_mode == NFS_SP4_MACH_CRED_PNFS_CLEANUP) { 372 /* Using machine creds for cleanup operations 373 * is only relevent if the client credentials 374 * might expire. So don't bother for 375 * RPC_AUTH_UNIX. If file was only exported to 376 * sec=sys, the PUTFH would fail anyway. 377 */ 378 if ((*clntp)->cl_auth->au_flavor == RPC_AUTH_UNIX) 379 return false; 380 } 381 if (test_bit(sp4_mode, &clp->cl_sp4_flags)) { 382 msg->rpc_cred = rpc_machine_cred(); 383 384 flavor = clp->cl_rpcclient->cl_auth->au_flavor; 385 WARN_ON_ONCE(flavor != RPC_AUTH_GSS_KRB5I && 386 flavor != RPC_AUTH_GSS_KRB5P); 387 *clntp = clp->cl_rpcclient; 388 389 return true; 390 } 391 return false; 392} 393 394/* 395 * Function responsible for determining if an rpc_message should use the 396 * machine cred under SP4_MACH_CRED and if so switching the credential and 397 * authflavor (using the nfs_client's rpc_clnt which will be krb5i/p). 398 * Should be called before rpc_call_sync/rpc_call_async. 399 */ 400static inline void 401nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_mode, 402 struct rpc_clnt **clntp, struct rpc_message *msg) 403{ 404 _nfs4_state_protect(clp, sp4_mode, clntp, msg); 405} 406 407/* 408 * Special wrapper to nfs4_state_protect for write. 409 * If WRITE can use machine cred but COMMIT cannot, make sure all writes 410 * that use machine cred use NFS_FILE_SYNC. 411 */ 412static inline void 413nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 414 struct rpc_message *msg, struct nfs_pgio_header *hdr) 415{ 416 if (_nfs4_state_protect(clp, NFS_SP4_MACH_CRED_WRITE, clntp, msg) && 417 !test_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags)) 418 hdr->args.stable = NFS_FILE_SYNC; 419} 420#else /* CONFIG_NFS_v4_1 */ 421static inline bool 422is_ds_only_client(struct nfs_client *clp) 423{ 424 return false; 425} 426 427static inline bool 428is_ds_client(struct nfs_client *clp) 429{ 430 return false; 431} 432 433static inline void 434nfs4_state_protect(struct nfs_client *clp, unsigned long sp4_flags, 435 struct rpc_clnt **clntp, struct rpc_message *msg) 436{ 437} 438 439static inline void 440nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, 441 struct rpc_message *msg, struct nfs_pgio_header *hdr) 442{ 443} 444#endif /* CONFIG_NFS_V4_1 */ 445 446extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; 447 448extern const u32 nfs4_fattr_bitmap[3]; 449extern const u32 nfs4_statfs_bitmap[3]; 450extern const u32 nfs4_pathconf_bitmap[3]; 451extern const u32 nfs4_fsinfo_bitmap[3]; 452extern const u32 nfs4_fs_locations_bitmap[3]; 453 454void nfs40_shutdown_client(struct nfs_client *); 455void nfs41_shutdown_client(struct nfs_client *); 456int nfs40_init_client(struct nfs_client *); 457int nfs41_init_client(struct nfs_client *); 458void nfs4_free_client(struct nfs_client *); 459 460struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *); 461 462/* nfs4renewd.c */ 463extern void nfs4_schedule_state_renewal(struct nfs_client *); 464extern void nfs4_kill_renewd(struct nfs_client *); 465extern void nfs4_renew_state(struct work_struct *); 466extern void nfs4_set_lease_period(struct nfs_client *clp, unsigned long lease); 467 468 469/* nfs4state.c */ 470extern const nfs4_stateid current_stateid; 471 472const struct cred *nfs4_get_clid_cred(struct nfs_client *clp); 473const struct cred *nfs4_get_machine_cred(struct nfs_client *clp); 474const struct cred *nfs4_get_renew_cred(struct nfs_client *clp); 475int nfs4_discover_server_trunking(struct nfs_client *clp, 476 struct nfs_client **); 477int nfs40_discover_server_trunking(struct nfs_client *clp, 478 struct nfs_client **, const struct cred *); 479#if defined(CONFIG_NFS_V4_1) 480int nfs41_discover_server_trunking(struct nfs_client *clp, 481 struct nfs_client **, const struct cred *); 482extern void nfs4_schedule_session_recovery(struct nfs4_session *, int); 483extern void nfs41_notify_server(struct nfs_client *); 484bool nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 485 struct nfs41_server_owner *o2); 486#else 487static inline void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) 488{ 489} 490#endif /* CONFIG_NFS_V4_1 */ 491 492extern struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *, const struct cred *, gfp_t); 493extern void nfs4_put_state_owner(struct nfs4_state_owner *); 494extern void nfs4_purge_state_owners(struct nfs_server *, struct list_head *); 495extern void nfs4_free_state_owners(struct list_head *head); 496extern struct nfs4_state * nfs4_get_open_state(struct inode *, struct nfs4_state_owner *); 497extern void nfs4_put_open_state(struct nfs4_state *); 498extern void nfs4_close_state(struct nfs4_state *, fmode_t); 499extern void nfs4_close_sync(struct nfs4_state *, fmode_t); 500extern void nfs4_state_set_mode_locked(struct nfs4_state *, fmode_t); 501extern void nfs_inode_find_state_and_recover(struct inode *inode, 502 const nfs4_stateid *stateid); 503extern int nfs4_state_mark_reclaim_nograce(struct nfs_client *, struct nfs4_state *); 504extern void nfs4_schedule_lease_recovery(struct nfs_client *); 505extern int nfs4_wait_clnt_recover(struct nfs_client *clp); 506extern int nfs4_client_recover_expired_lease(struct nfs_client *clp); 507extern void nfs4_schedule_state_manager(struct nfs_client *); 508extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp); 509extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *); 510extern int nfs4_schedule_migration_recovery(const struct nfs_server *); 511extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *); 512extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, bool); 513extern void nfs41_handle_server_scope(struct nfs_client *, 514 struct nfs41_server_scope **); 515extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp); 516extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl); 517extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t, 518 const struct nfs_lock_context *, nfs4_stateid *, 519 const struct cred **); 520extern bool nfs4_copy_open_stateid(nfs4_stateid *dst, 521 struct nfs4_state *state); 522 523extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask); 524extern int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task); 525extern void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid); 526extern void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid); 527extern void nfs_release_seqid(struct nfs_seqid *seqid); 528extern void nfs_free_seqid(struct nfs_seqid *seqid); 529extern int nfs4_setup_sequence(struct nfs_client *client, 530 struct nfs4_sequence_args *args, 531 struct nfs4_sequence_res *res, 532 struct rpc_task *task); 533extern int nfs4_sequence_done(struct rpc_task *task, 534 struct nfs4_sequence_res *res); 535 536extern void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp); 537extern int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res); 538extern const nfs4_stateid zero_stateid; 539extern const nfs4_stateid invalid_stateid; 540 541/* nfs4super.c */ 542struct nfs_mount_info; 543extern struct nfs_subversion nfs_v4; 544extern bool nfs4_disable_idmapping; 545extern unsigned short max_session_slots; 546extern unsigned short max_session_cb_slots; 547extern unsigned short send_implementation_id; 548extern bool recover_lost_locks; 549 550#define NFS4_CLIENT_ID_UNIQ_LEN (64) 551extern char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN]; 552 553extern int nfs4_try_get_tree(struct fs_context *); 554extern int nfs4_get_referral_tree(struct fs_context *); 555 556/* nfs4sysctl.c */ 557#ifdef CONFIG_SYSCTL 558int nfs4_register_sysctl(void); 559void nfs4_unregister_sysctl(void); 560#else 561static inline int nfs4_register_sysctl(void) 562{ 563 return 0; 564} 565 566static inline void nfs4_unregister_sysctl(void) 567{ 568} 569#endif 570 571/* nfs4xdr.c */ 572extern const struct rpc_procinfo nfs4_procedures[]; 573 574#ifdef CONFIG_NFS_V4_2 575extern const u32 nfs42_maxsetxattr_overhead; 576extern const u32 nfs42_maxgetxattr_overhead; 577extern const u32 nfs42_maxlistxattrs_overhead; 578#endif 579 580struct nfs4_mount_data; 581 582/* callback_xdr.c */ 583extern const struct svc_version nfs4_callback_version1; 584extern const struct svc_version nfs4_callback_version4; 585 586static inline void nfs4_stateid_copy(nfs4_stateid *dst, const nfs4_stateid *src) 587{ 588 memcpy(dst->data, src->data, sizeof(dst->data)); 589 dst->type = src->type; 590} 591 592static inline bool nfs4_stateid_match(const nfs4_stateid *dst, const nfs4_stateid *src) 593{ 594 if (dst->type != src->type) 595 return false; 596 return memcmp(dst->data, src->data, sizeof(dst->data)) == 0; 597} 598 599static inline bool nfs4_stateid_match_other(const nfs4_stateid *dst, const nfs4_stateid *src) 600{ 601 return memcmp(dst->other, src->other, NFS4_STATEID_OTHER_SIZE) == 0; 602} 603 604static inline bool nfs4_stateid_is_newer(const nfs4_stateid *s1, const nfs4_stateid *s2) 605{ 606 return (s32)(be32_to_cpu(s1->seqid) - be32_to_cpu(s2->seqid)) > 0; 607} 608 609static inline bool nfs4_stateid_is_next(const nfs4_stateid *s1, const nfs4_stateid *s2) 610{ 611 u32 seq1 = be32_to_cpu(s1->seqid); 612 u32 seq2 = be32_to_cpu(s2->seqid); 613 614 return seq2 == seq1 + 1U || (seq2 == 1U && seq1 == 0xffffffffU); 615} 616 617static inline bool nfs4_stateid_match_or_older(const nfs4_stateid *dst, const nfs4_stateid *src) 618{ 619 return nfs4_stateid_match_other(dst, src) && 620 !(src->seqid && nfs4_stateid_is_newer(dst, src)); 621} 622 623static inline void nfs4_stateid_seqid_inc(nfs4_stateid *s1) 624{ 625 u32 seqid = be32_to_cpu(s1->seqid); 626 627 if (++seqid == 0) 628 ++seqid; 629 s1->seqid = cpu_to_be32(seqid); 630} 631 632static inline bool nfs4_valid_open_stateid(const struct nfs4_state *state) 633{ 634 return test_bit(NFS_STATE_RECOVERY_FAILED, &state->flags) == 0; 635} 636 637static inline bool nfs4_state_match_open_stateid_other(const struct nfs4_state *state, 638 const nfs4_stateid *stateid) 639{ 640 return test_bit(NFS_OPEN_STATE, &state->flags) && 641 nfs4_stateid_match_other(&state->open_stateid, stateid); 642} 643 644/* nfs42xattr.c */ 645#ifdef CONFIG_NFS_V4_2 646extern int __init nfs4_xattr_cache_init(void); 647extern void nfs4_xattr_cache_exit(void); 648extern void nfs4_xattr_cache_add(struct inode *inode, const char *name, 649 const char *buf, struct page **pages, 650 ssize_t buflen); 651extern void nfs4_xattr_cache_remove(struct inode *inode, const char *name); 652extern ssize_t nfs4_xattr_cache_get(struct inode *inode, const char *name, 653 char *buf, ssize_t buflen); 654extern void nfs4_xattr_cache_set_list(struct inode *inode, const char *buf, 655 ssize_t buflen); 656extern ssize_t nfs4_xattr_cache_list(struct inode *inode, char *buf, 657 ssize_t buflen); 658extern void nfs4_xattr_cache_zap(struct inode *inode); 659#else 660static inline void nfs4_xattr_cache_zap(struct inode *inode) 661{ 662} 663#endif /* CONFIG_NFS_V4_2 */ 664 665#else /* CONFIG_NFS_V4 */ 666 667#define nfs4_close_state(a, b) do { } while (0) 668#define nfs4_close_sync(a, b) do { } while (0) 669#define nfs4_state_protect(a, b, c, d) do { } while (0) 670#define nfs4_state_protect_write(a, b, c, d) do { } while (0) 671 672 673#endif /* CONFIG_NFS_V4 */ 674#endif /* __LINUX_FS_NFS_NFS4_FS.H */ 675