1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * NFS internal definitions 4 */ 5 6 #include "nfs4_fs.h" 7 #include <linux/fs_context.h> 8 #include <linux/security.h> 9 #include <linux/crc32.h> 10 #include <linux/sunrpc/addr.h> 11 #include <linux/nfs_page.h> 12 #include <linux/wait_bit.h> 13 14 #define NFS_MS_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS) 15 16 extern const struct export_operations nfs_export_ops; 17 18 struct nfs_string; 19 struct nfs_pageio_descriptor; 20 21 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 22 { 23 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 24 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 25 } 26 27 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 28 { 29 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 30 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 31 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 32 return 0; 33 return 1; 34 } 35 36 struct nfs_clone_mount { 37 const struct super_block *sb; 38 struct dentry *dentry; 39 char *hostname; 40 char *mnt_path; 41 struct sockaddr *addr; 42 size_t addrlen; 43 rpc_authflavor_t authflavor; 44 struct nfs_fattr *fattr; 45 }; 46 47 /* 48 * Note: RFC 1813 doesn't limit the number of auth flavors that 49 * a server can return, so make something up. 50 */ 51 #define NFS_MAX_SECFLAVORS (12) 52 53 /* 54 * Value used if the user did not specify a port value. 55 */ 56 #define NFS_UNSPEC_PORT (-1) 57 58 #define NFS_UNSPEC_RETRANS (UINT_MAX) 59 #define NFS_UNSPEC_TIMEO (UINT_MAX) 60 61 /* 62 * Maximum number of pages that readdir can use for creating 63 * a vmapped array of pages. 64 */ 65 #define NFS_MAX_READDIR_PAGES 8 66 67 struct nfs_client_initdata { 68 unsigned long init_flags; 69 const char *hostname; /* Hostname of the server */ 70 const struct sockaddr *addr; /* Address of the server */ 71 const char *nodename; /* Hostname of the client */ 72 const char *ip_addr; /* IP address of the client */ 73 size_t addrlen; 74 struct nfs_subversion *nfs_mod; 75 int proto; 76 u32 minorversion; 77 unsigned int nconnect; 78 struct net *net; 79 const struct rpc_timeout *timeparms; 80 const struct cred *cred; 81 }; 82 83 struct nfs_mount_info { 84 unsigned int inherited_bsize; 85 struct nfs_fs_context *ctx; 86 struct nfs_clone_mount *cloned; 87 struct nfs_server *server; 88 struct nfs_fh *mntfh; 89 struct nfs_subversion *nfs_mod; 90 }; 91 92 /* 93 * In-kernel mount arguments 94 */ 95 struct nfs_fs_context { 96 bool internal; 97 bool skip_reconfig_option_check; 98 bool need_mount; 99 bool sloppy; 100 unsigned int flags; /* NFS{,4}_MOUNT_* flags */ 101 unsigned int rsize, wsize; 102 unsigned int timeo, retrans; 103 unsigned int acregmin, acregmax; 104 unsigned int acdirmin, acdirmax; 105 unsigned int namlen; 106 unsigned int options; 107 unsigned int bsize; 108 struct nfs_auth_info auth_info; 109 rpc_authflavor_t selected_flavor; 110 char *client_address; 111 unsigned int version; 112 unsigned int minorversion; 113 char *fscache_uniq; 114 unsigned short protofamily; 115 unsigned short mountfamily; 116 117 struct { 118 union { 119 struct sockaddr address; 120 struct sockaddr_storage _address; 121 }; 122 size_t addrlen; 123 char *hostname; 124 u32 version; 125 int port; 126 unsigned short protocol; 127 } mount_server; 128 129 struct { 130 union { 131 struct sockaddr address; 132 struct sockaddr_storage _address; 133 }; 134 size_t addrlen; 135 char *hostname; 136 char *export_path; 137 int port; 138 unsigned short protocol; 139 unsigned short nconnect; 140 unsigned short export_path_len; 141 } nfs_server; 142 143 void *lsm_opts; 144 struct net *net; 145 146 char buf[32]; /* Parse buffer */ 147 148 struct nfs_mount_info mount_info; 149 struct nfs_clone_mount clone_data; 150 }; 151 152 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc) 153 { 154 return fc->fs_private; 155 } 156 157 /* mount_clnt.c */ 158 struct nfs_mount_request { 159 struct sockaddr *sap; 160 size_t salen; 161 char *hostname; 162 char *dirpath; 163 u32 version; 164 unsigned short protocol; 165 struct nfs_fh *fh; 166 int noresvport; 167 unsigned int *auth_flav_len; 168 rpc_authflavor_t *auth_flavs; 169 struct net *net; 170 }; 171 172 extern int nfs_mount(struct nfs_mount_request *info); 173 extern void nfs_umount(const struct nfs_mount_request *info); 174 175 /* client.c */ 176 extern const struct rpc_program nfs_program; 177 extern void nfs_clients_init(struct net *net); 178 extern void nfs_clients_exit(struct net *net); 179 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 180 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 181 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 182 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 183 void nfs_server_insert_lists(struct nfs_server *); 184 void nfs_server_remove_lists(struct nfs_server *); 185 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 186 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 187 rpc_authflavor_t); 188 struct nfs_server *nfs_alloc_server(void); 189 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 190 191 extern void nfs_put_client(struct nfs_client *); 192 extern void nfs_free_client(struct nfs_client *); 193 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 194 extern struct nfs_client * 195 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 196 struct nfs4_sessionid *, u32); 197 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *); 198 extern struct nfs_server *nfs4_create_server(struct nfs_mount_info *); 199 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 200 struct nfs_fh *); 201 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 202 struct sockaddr *sap, size_t salen, 203 struct net *net); 204 extern void nfs_free_server(struct nfs_server *server); 205 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 206 struct nfs_fh *, 207 struct nfs_fattr *, 208 rpc_authflavor_t); 209 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 210 extern int nfs_client_init_status(const struct nfs_client *clp); 211 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 212 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 213 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 214 const struct sockaddr *ds_addr, 215 int ds_addrlen, int ds_proto, 216 unsigned int ds_timeo, 217 unsigned int ds_retrans, 218 u32 minor_version); 219 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 220 struct inode *); 221 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 222 const struct sockaddr *ds_addr, int ds_addrlen, 223 int ds_proto, unsigned int ds_timeo, 224 unsigned int ds_retrans); 225 #ifdef CONFIG_PROC_FS 226 extern int __init nfs_fs_proc_init(void); 227 extern void nfs_fs_proc_exit(void); 228 extern int nfs_fs_proc_net_init(struct net *net); 229 extern void nfs_fs_proc_net_exit(struct net *net); 230 #else 231 static inline int nfs_fs_proc_net_init(struct net *net) 232 { 233 return 0; 234 } 235 static inline void nfs_fs_proc_net_exit(struct net *net) 236 { 237 } 238 static inline int nfs_fs_proc_init(void) 239 { 240 return 0; 241 } 242 static inline void nfs_fs_proc_exit(void) 243 { 244 } 245 #endif 246 247 /* callback_xdr.c */ 248 extern const struct svc_version nfs4_callback_version1; 249 extern const struct svc_version nfs4_callback_version4; 250 251 /* fs_context.c */ 252 extern struct file_system_type nfs_fs_type; 253 254 /* pagelist.c */ 255 extern int __init nfs_init_nfspagecache(void); 256 extern void nfs_destroy_nfspagecache(void); 257 extern int __init nfs_init_readpagecache(void); 258 extern void nfs_destroy_readpagecache(void); 259 extern int __init nfs_init_writepagecache(void); 260 extern void nfs_destroy_writepagecache(void); 261 262 extern int __init nfs_init_directcache(void); 263 extern void nfs_destroy_directcache(void); 264 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 265 struct nfs_pgio_header *hdr, 266 void (*release)(struct nfs_pgio_header *hdr)); 267 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 268 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 269 270 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 271 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 272 void nfs_pgio_header_free(struct nfs_pgio_header *); 273 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 274 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 275 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, 276 const struct rpc_call_ops *call_ops, int how, int flags); 277 void nfs_free_request(struct nfs_page *req); 278 struct nfs_pgio_mirror * 279 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 280 281 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc) 282 { 283 WARN_ON_ONCE(desc->pg_mirror_count < 1); 284 return desc->pg_mirror_count > 1; 285 } 286 287 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 288 const struct nfs_open_context *ctx2) 289 { 290 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; 291 } 292 293 /* nfs2xdr.c */ 294 extern const struct rpc_procinfo nfs_procedures[]; 295 extern int nfs2_decode_dirent(struct xdr_stream *, 296 struct nfs_entry *, bool); 297 298 /* nfs3xdr.c */ 299 extern const struct rpc_procinfo nfs3_procedures[]; 300 extern int nfs3_decode_dirent(struct xdr_stream *, 301 struct nfs_entry *, bool); 302 303 /* nfs4xdr.c */ 304 #if IS_ENABLED(CONFIG_NFS_V4) 305 extern int nfs4_decode_dirent(struct xdr_stream *, 306 struct nfs_entry *, bool); 307 #endif 308 #ifdef CONFIG_NFS_V4_1 309 extern const u32 nfs41_maxread_overhead; 310 extern const u32 nfs41_maxwrite_overhead; 311 extern const u32 nfs41_maxgetdevinfo_overhead; 312 #endif 313 314 /* nfs4proc.c */ 315 #if IS_ENABLED(CONFIG_NFS_V4) 316 extern const struct rpc_procinfo nfs4_procedures[]; 317 #endif 318 319 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 320 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 321 static inline struct nfs4_label * 322 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 323 { 324 if (!dst || !src) 325 return NULL; 326 327 if (src->len > NFS4_MAXLABELLEN) 328 return NULL; 329 330 dst->lfs = src->lfs; 331 dst->pi = src->pi; 332 dst->len = src->len; 333 memcpy(dst->label, src->label, src->len); 334 335 return dst; 336 } 337 static inline void nfs4_label_free(struct nfs4_label *label) 338 { 339 if (label) { 340 kfree(label->label); 341 kfree(label); 342 } 343 return; 344 } 345 346 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 347 { 348 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 349 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 350 } 351 #else 352 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 353 static inline void nfs4_label_free(void *label) {} 354 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 355 { 356 } 357 static inline struct nfs4_label * 358 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 359 { 360 return NULL; 361 } 362 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 363 364 /* proc.c */ 365 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 366 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 367 const struct nfs_client_initdata *); 368 369 /* dir.c */ 370 extern void nfs_advise_use_readdirplus(struct inode *dir); 371 extern void nfs_force_use_readdirplus(struct inode *dir); 372 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 373 struct shrink_control *sc); 374 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 375 struct shrink_control *sc); 376 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 377 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 378 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 379 int nfs_rmdir(struct inode *, struct dentry *); 380 int nfs_unlink(struct inode *, struct dentry *); 381 int nfs_symlink(struct inode *, struct dentry *, const char *); 382 int nfs_link(struct dentry *, struct inode *, struct dentry *); 383 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 384 int nfs_rename(struct inode *, struct dentry *, 385 struct inode *, struct dentry *, unsigned int); 386 387 /* file.c */ 388 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 389 loff_t nfs_file_llseek(struct file *, loff_t, int); 390 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 391 int nfs_file_mmap(struct file *, struct vm_area_struct *); 392 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 393 int nfs_file_release(struct inode *, struct file *); 394 int nfs_lock(struct file *, int, struct file_lock *); 395 int nfs_flock(struct file *, int, struct file_lock *); 396 int nfs_check_flags(int); 397 398 /* inode.c */ 399 extern struct workqueue_struct *nfsiod_workqueue; 400 extern struct inode *nfs_alloc_inode(struct super_block *sb); 401 extern void nfs_free_inode(struct inode *); 402 extern int nfs_write_inode(struct inode *, struct writeback_control *); 403 extern int nfs_drop_inode(struct inode *); 404 extern void nfs_clear_inode(struct inode *); 405 extern void nfs_evict_inode(struct inode *); 406 void nfs_zap_acl_cache(struct inode *inode); 407 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 408 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 409 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); 410 411 /* super.c */ 412 extern const struct super_operations nfs_sops; 413 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 414 int nfs_try_get_tree(struct fs_context *); 415 int nfs_get_tree_common(struct fs_context *); 416 void nfs_kill_super(struct super_block *); 417 418 extern struct rpc_stat nfs_rpcstat; 419 420 extern int __init register_nfs_fs(void); 421 extern void __exit unregister_nfs_fs(void); 422 extern bool nfs_sb_active(struct super_block *sb); 423 extern void nfs_sb_deactive(struct super_block *sb); 424 425 /* io.c */ 426 extern void nfs_start_io_read(struct inode *inode); 427 extern void nfs_end_io_read(struct inode *inode); 428 extern void nfs_start_io_write(struct inode *inode); 429 extern void nfs_end_io_write(struct inode *inode); 430 extern void nfs_start_io_direct(struct inode *inode); 431 extern void nfs_end_io_direct(struct inode *inode); 432 433 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 434 { 435 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 436 } 437 438 /* namespace.c */ 439 #define NFS_PATH_CANONICAL 1 440 extern char *nfs_path(char **p, struct dentry *dentry, 441 char *buffer, ssize_t buflen, unsigned flags); 442 extern struct vfsmount *nfs_d_automount(struct path *path); 443 int nfs_submount(struct fs_context *, struct nfs_server *); 444 int nfs_do_submount(struct fs_context *); 445 446 /* getroot.c */ 447 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 448 const char *); 449 #if IS_ENABLED(CONFIG_NFS_V4) 450 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 451 const char *); 452 453 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 454 #endif 455 456 struct nfs_pgio_completion_ops; 457 /* read.c */ 458 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 459 struct inode *inode, bool force_mds, 460 const struct nfs_pgio_completion_ops *compl_ops); 461 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 462 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 463 464 /* super.c */ 465 void nfs_umount_begin(struct super_block *); 466 int nfs_statfs(struct dentry *, struct kstatfs *); 467 int nfs_show_options(struct seq_file *, struct dentry *); 468 int nfs_show_devname(struct seq_file *, struct dentry *); 469 int nfs_show_path(struct seq_file *, struct dentry *); 470 int nfs_show_stats(struct seq_file *, struct dentry *); 471 int nfs_reconfigure(struct fs_context *); 472 473 /* write.c */ 474 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 475 struct inode *inode, int ioflags, bool force_mds, 476 const struct nfs_pgio_completion_ops *compl_ops); 477 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 478 extern void nfs_commit_free(struct nfs_commit_data *p); 479 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 480 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 481 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 482 struct nfs_commit_data *data, 483 const struct nfs_rpc_ops *nfs_ops, 484 const struct rpc_call_ops *call_ops, 485 int how, int flags); 486 extern void nfs_init_commit(struct nfs_commit_data *data, 487 struct list_head *head, 488 struct pnfs_layout_segment *lseg, 489 struct nfs_commit_info *cinfo); 490 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 491 struct nfs_commit_info *cinfo, int max); 492 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 493 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 494 struct nfs_commit_info *cinfo); 495 void nfs_mark_request_commit(struct nfs_page *req, 496 struct pnfs_layout_segment *lseg, 497 struct nfs_commit_info *cinfo, 498 u32 ds_commit_idx); 499 int nfs_write_need_commit(struct nfs_pgio_header *); 500 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 501 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 502 int how, struct nfs_commit_info *cinfo); 503 void nfs_retry_commit(struct list_head *page_list, 504 struct pnfs_layout_segment *lseg, 505 struct nfs_commit_info *cinfo, 506 u32 ds_commit_idx); 507 void nfs_commitdata_release(struct nfs_commit_data *data); 508 void nfs_request_add_commit_list(struct nfs_page *req, 509 struct nfs_commit_info *cinfo); 510 void nfs_request_add_commit_list_locked(struct nfs_page *req, 511 struct list_head *dst, 512 struct nfs_commit_info *cinfo); 513 void nfs_request_remove_commit_list(struct nfs_page *req, 514 struct nfs_commit_info *cinfo); 515 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 516 struct inode *inode, 517 struct nfs_direct_req *dreq); 518 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 519 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 520 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 521 522 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 523 loff_t lstart, loff_t lend); 524 525 #ifdef CONFIG_NFS_V4_1 526 static inline 527 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 528 { 529 int i; 530 531 for (i = 0; i < cinfo->nbuckets; i++) 532 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 533 } 534 #else 535 static inline 536 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 537 { 538 } 539 #endif 540 541 #ifdef CONFIG_MIGRATION 542 extern int nfs_migrate_page(struct address_space *, 543 struct page *, struct page *, enum migrate_mode); 544 #endif 545 546 static inline int 547 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 548 const struct nfs_write_verifier *v2) 549 { 550 return memcmp(v1->data, v2->data, sizeof(v1->data)); 551 } 552 553 /* unlink.c */ 554 extern struct rpc_task * 555 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 556 struct dentry *old_dentry, struct dentry *new_dentry, 557 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 558 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 559 560 /* direct.c */ 561 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 562 struct nfs_direct_req *dreq); 563 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 564 565 /* nfs4proc.c */ 566 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 567 const struct nfs_client_initdata *); 568 extern int nfs40_walk_client_list(struct nfs_client *clp, 569 struct nfs_client **result, 570 const struct cred *cred); 571 extern int nfs41_walk_client_list(struct nfs_client *clp, 572 struct nfs_client **result, 573 const struct cred *cred); 574 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, 575 struct rpc_xprt *xprt, 576 void *data); 577 578 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 579 { 580 inode = igrab(inode); 581 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 582 iput(inode); 583 inode = NULL; 584 } 585 return inode; 586 } 587 588 static inline void nfs_iput_and_deactive(struct inode *inode) 589 { 590 if (inode != NULL) { 591 struct super_block *sb = inode->i_sb; 592 593 iput(inode); 594 nfs_sb_deactive(sb); 595 } 596 } 597 598 /* 599 * Determine the device name as a string 600 */ 601 static inline char *nfs_devname(struct dentry *dentry, 602 char *buffer, ssize_t buflen) 603 { 604 char *dummy; 605 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 606 } 607 608 /* 609 * Determine the actual block size (and log2 thereof) 610 */ 611 static inline 612 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 613 { 614 /* make sure blocksize is a power of two */ 615 if ((bsize & (bsize - 1)) || nrbitsp) { 616 unsigned char nrbits; 617 618 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 619 ; 620 bsize = 1 << nrbits; 621 if (nrbitsp) 622 *nrbitsp = nrbits; 623 } 624 625 return bsize; 626 } 627 628 /* 629 * Calculate the number of 512byte blocks used. 630 */ 631 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 632 { 633 blkcnt_t used = (tsize + 511) >> 9; 634 return (used > ULONG_MAX) ? ULONG_MAX : used; 635 } 636 637 /* 638 * Compute and set NFS server blocksize 639 */ 640 static inline 641 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 642 { 643 if (bsize < NFS_MIN_FILE_IO_SIZE) 644 bsize = NFS_DEF_FILE_IO_SIZE; 645 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 646 bsize = NFS_MAX_FILE_IO_SIZE; 647 648 return nfs_block_bits(bsize, nrbitsp); 649 } 650 651 /* 652 * Determine the maximum file size for a superblock 653 */ 654 static inline 655 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 656 { 657 sb->s_maxbytes = (loff_t)maxfilesize; 658 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 659 sb->s_maxbytes = MAX_LFS_FILESIZE; 660 } 661 662 /* 663 * Record the page as unstable and mark its inode as dirty. 664 */ 665 static inline 666 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) 667 { 668 if (!cinfo->dreq) { 669 struct inode *inode = page_file_mapping(page)->host; 670 671 inc_node_page_state(page, NR_UNSTABLE_NFS); 672 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE); 673 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 674 } 675 } 676 677 /* 678 * Determine the number of bytes of data the page contains 679 */ 680 static inline 681 unsigned int nfs_page_length(struct page *page) 682 { 683 loff_t i_size = i_size_read(page_file_mapping(page)->host); 684 685 if (i_size > 0) { 686 pgoff_t index = page_index(page); 687 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 688 if (index < end_index) 689 return PAGE_SIZE; 690 if (index == end_index) 691 return ((i_size - 1) & ~PAGE_MASK) + 1; 692 } 693 return 0; 694 } 695 696 /* 697 * Convert a umode to a dirent->d_type 698 */ 699 static inline 700 unsigned char nfs_umode_to_dtype(umode_t mode) 701 { 702 return (mode >> 12) & 15; 703 } 704 705 /* 706 * Determine the number of pages in an array of length 'len' and 707 * with a base offset of 'base' 708 */ 709 static inline 710 unsigned int nfs_page_array_len(unsigned int base, size_t len) 711 { 712 return ((unsigned long)len + (unsigned long)base + 713 PAGE_SIZE - 1) >> PAGE_SHIFT; 714 } 715 716 /* 717 * Convert a struct timespec into a 64-bit change attribute 718 * 719 * This does approximately the same thing as timespec_to_ns(), 720 * but for calculation efficiency, we multiply the seconds by 721 * 1024*1024*1024. 722 */ 723 static inline 724 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts) 725 { 726 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 727 } 728 729 #ifdef CONFIG_CRC32 730 /** 731 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 732 * @fh - pointer to filehandle 733 * 734 * returns a crc32 hash for the filehandle that is compatible with 735 * the one displayed by "wireshark". 736 */ 737 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 738 { 739 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 740 } 741 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 742 { 743 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 744 NFS4_STATEID_OTHER_SIZE); 745 } 746 #else 747 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 748 { 749 return 0; 750 } 751 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 752 { 753 return 0; 754 } 755 #endif 756 757 static inline bool nfs_error_is_fatal(int err) 758 { 759 switch (err) { 760 case -ERESTARTSYS: 761 case -EINTR: 762 case -EACCES: 763 case -EDQUOT: 764 case -EFBIG: 765 case -EIO: 766 case -ENOSPC: 767 case -EROFS: 768 case -ESTALE: 769 case -E2BIG: 770 case -ENOMEM: 771 case -ETIMEDOUT: 772 return true; 773 default: 774 return false; 775 } 776 } 777 778 static inline bool nfs_error_is_fatal_on_server(int err) 779 { 780 switch (err) { 781 case 0: 782 case -ERESTARTSYS: 783 case -EINTR: 784 return false; 785 } 786 return nfs_error_is_fatal(err); 787 } 788 789 /* 790 * Select between a default port value and a user-specified port value. 791 * If a zero value is set, then autobind will be used. 792 */ 793 static inline void nfs_set_port(struct sockaddr *sap, int *port, 794 const unsigned short default_port) 795 { 796 if (*port == NFS_UNSPEC_PORT) 797 *port = default_port; 798 799 rpc_set_port(sap, *port); 800 } 801