1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * NFS internal definitions 4 */ 5 6 #include "nfs4_fs.h" 7 #include <linux/mount.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 20 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 21 { 22 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 23 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 24 } 25 26 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 27 { 28 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 29 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 30 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 31 return 0; 32 return 1; 33 } 34 35 struct nfs_clone_mount { 36 const struct super_block *sb; 37 const struct dentry *dentry; 38 char *hostname; 39 char *mnt_path; 40 struct sockaddr *addr; 41 size_t addrlen; 42 rpc_authflavor_t authflavor; 43 }; 44 45 /* 46 * Note: RFC 1813 doesn't limit the number of auth flavors that 47 * a server can return, so make something up. 48 */ 49 #define NFS_MAX_SECFLAVORS (12) 50 51 /* 52 * Value used if the user did not specify a port value. 53 */ 54 #define NFS_UNSPEC_PORT (-1) 55 56 #define NFS_UNSPEC_RETRANS (UINT_MAX) 57 #define NFS_UNSPEC_TIMEO (UINT_MAX) 58 59 /* 60 * Maximum number of pages that readdir can use for creating 61 * a vmapped array of pages. 62 */ 63 #define NFS_MAX_READDIR_PAGES 8 64 65 struct nfs_client_initdata { 66 unsigned long init_flags; 67 const char *hostname; /* Hostname of the server */ 68 const struct sockaddr *addr; /* Address of the server */ 69 const char *nodename; /* Hostname of the client */ 70 const char *ip_addr; /* IP address of the client */ 71 size_t addrlen; 72 struct nfs_subversion *nfs_mod; 73 int proto; 74 u32 minorversion; 75 unsigned int nconnect; 76 struct net *net; 77 const struct rpc_timeout *timeparms; 78 const struct cred *cred; 79 }; 80 81 /* 82 * In-kernel mount arguments 83 */ 84 struct nfs_fs_context { 85 unsigned int flags; /* NFS{,4}_MOUNT_* flags */ 86 unsigned int rsize, wsize; 87 unsigned int timeo, retrans; 88 unsigned int acregmin, acregmax; 89 unsigned int acdirmin, acdirmax; 90 unsigned int namlen; 91 unsigned int options; 92 unsigned int bsize; 93 struct nfs_auth_info auth_info; 94 rpc_authflavor_t selected_flavor; 95 char *client_address; 96 unsigned int version; 97 unsigned int minorversion; 98 char *fscache_uniq; 99 unsigned short protofamily; 100 unsigned short mountfamily; 101 bool need_mount; 102 bool sloppy; 103 104 struct { 105 union { 106 struct sockaddr address; 107 struct sockaddr_storage _address; 108 }; 109 size_t addrlen; 110 char *hostname; 111 u32 version; 112 int port; 113 unsigned short protocol; 114 } mount_server; 115 116 struct { 117 union { 118 struct sockaddr address; 119 struct sockaddr_storage _address; 120 }; 121 size_t addrlen; 122 char *hostname; 123 char *export_path; 124 int port; 125 unsigned short protocol; 126 unsigned short nconnect; 127 } nfs_server; 128 129 void *lsm_opts; 130 struct net *net; 131 132 char buf[32]; /* Parse buffer */ 133 }; 134 135 /* mount_clnt.c */ 136 struct nfs_mount_request { 137 struct sockaddr *sap; 138 size_t salen; 139 char *hostname; 140 char *dirpath; 141 u32 version; 142 unsigned short protocol; 143 struct nfs_fh *fh; 144 int noresvport; 145 unsigned int *auth_flav_len; 146 rpc_authflavor_t *auth_flavs; 147 struct net *net; 148 }; 149 150 struct nfs_mount_info { 151 unsigned int inherited_bsize; 152 struct nfs_fs_context *ctx; 153 struct nfs_clone_mount *cloned; 154 struct nfs_server *server; 155 struct nfs_fh *mntfh; 156 struct nfs_subversion *nfs_mod; 157 }; 158 159 extern int nfs_mount(struct nfs_mount_request *info); 160 extern void nfs_umount(const struct nfs_mount_request *info); 161 162 /* client.c */ 163 extern const struct rpc_program nfs_program; 164 extern void nfs_clients_init(struct net *net); 165 extern void nfs_clients_exit(struct net *net); 166 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 167 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 168 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 169 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 170 void nfs_server_insert_lists(struct nfs_server *); 171 void nfs_server_remove_lists(struct nfs_server *); 172 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 173 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 174 rpc_authflavor_t); 175 struct nfs_server *nfs_alloc_server(void); 176 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 177 178 extern void nfs_put_client(struct nfs_client *); 179 extern void nfs_free_client(struct nfs_client *); 180 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 181 extern struct nfs_client * 182 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 183 struct nfs4_sessionid *, u32); 184 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *); 185 extern struct nfs_server *nfs4_create_server(struct nfs_mount_info *); 186 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 187 struct nfs_fh *); 188 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 189 struct sockaddr *sap, size_t salen, 190 struct net *net); 191 extern void nfs_free_server(struct nfs_server *server); 192 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 193 struct nfs_fh *, 194 struct nfs_fattr *, 195 rpc_authflavor_t); 196 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 197 extern int nfs_client_init_status(const struct nfs_client *clp); 198 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 199 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 200 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 201 const struct sockaddr *ds_addr, 202 int ds_addrlen, int ds_proto, 203 unsigned int ds_timeo, 204 unsigned int ds_retrans, 205 u32 minor_version); 206 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 207 struct inode *); 208 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 209 const struct sockaddr *ds_addr, int ds_addrlen, 210 int ds_proto, unsigned int ds_timeo, 211 unsigned int ds_retrans); 212 #ifdef CONFIG_PROC_FS 213 extern int __init nfs_fs_proc_init(void); 214 extern void nfs_fs_proc_exit(void); 215 extern int nfs_fs_proc_net_init(struct net *net); 216 extern void nfs_fs_proc_net_exit(struct net *net); 217 #else 218 static inline int nfs_fs_proc_net_init(struct net *net) 219 { 220 return 0; 221 } 222 static inline void nfs_fs_proc_net_exit(struct net *net) 223 { 224 } 225 static inline int nfs_fs_proc_init(void) 226 { 227 return 0; 228 } 229 static inline void nfs_fs_proc_exit(void) 230 { 231 } 232 #endif 233 234 /* callback_xdr.c */ 235 extern const struct svc_version nfs4_callback_version1; 236 extern const struct svc_version nfs4_callback_version4; 237 238 struct nfs_pageio_descriptor; 239 240 /* mount.c */ 241 #define NFS_TEXT_DATA 1 242 243 extern struct nfs_fs_context *nfs_alloc_parsed_mount_data(void); 244 extern void nfs_free_parsed_mount_data(struct nfs_fs_context *ctx); 245 extern int nfs_parse_mount_options(char *raw, struct nfs_fs_context *ctx); 246 extern int nfs_validate_mount_data(struct file_system_type *fs_type, 247 void *options, 248 struct nfs_fs_context *ctx, 249 struct nfs_fh *mntfh, 250 const char *dev_name); 251 extern int nfs_validate_text_mount_data(void *options, 252 struct nfs_fs_context *ctx, 253 const char *dev_name); 254 255 /* pagelist.c */ 256 extern int __init nfs_init_nfspagecache(void); 257 extern void nfs_destroy_nfspagecache(void); 258 extern int __init nfs_init_readpagecache(void); 259 extern void nfs_destroy_readpagecache(void); 260 extern int __init nfs_init_writepagecache(void); 261 extern void nfs_destroy_writepagecache(void); 262 263 extern int __init nfs_init_directcache(void); 264 extern void nfs_destroy_directcache(void); 265 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 266 struct nfs_pgio_header *hdr, 267 void (*release)(struct nfs_pgio_header *hdr)); 268 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 269 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 270 271 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 272 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 273 void nfs_pgio_header_free(struct nfs_pgio_header *); 274 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 275 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 276 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, 277 const struct rpc_call_ops *call_ops, int how, int flags); 278 void nfs_free_request(struct nfs_page *req); 279 struct nfs_pgio_mirror * 280 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 281 282 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc) 283 { 284 WARN_ON_ONCE(desc->pg_mirror_count < 1); 285 return desc->pg_mirror_count > 1; 286 } 287 288 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 289 const struct nfs_open_context *ctx2) 290 { 291 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; 292 } 293 294 /* nfs2xdr.c */ 295 extern const struct rpc_procinfo nfs_procedures[]; 296 extern int nfs2_decode_dirent(struct xdr_stream *, 297 struct nfs_entry *, bool); 298 299 /* nfs3xdr.c */ 300 extern const struct rpc_procinfo nfs3_procedures[]; 301 extern int nfs3_decode_dirent(struct xdr_stream *, 302 struct nfs_entry *, bool); 303 304 /* nfs4xdr.c */ 305 #if IS_ENABLED(CONFIG_NFS_V4) 306 extern int nfs4_decode_dirent(struct xdr_stream *, 307 struct nfs_entry *, bool); 308 #endif 309 #ifdef CONFIG_NFS_V4_1 310 extern const u32 nfs41_maxread_overhead; 311 extern const u32 nfs41_maxwrite_overhead; 312 extern const u32 nfs41_maxgetdevinfo_overhead; 313 #endif 314 315 /* nfs4proc.c */ 316 #if IS_ENABLED(CONFIG_NFS_V4) 317 extern const struct rpc_procinfo nfs4_procedures[]; 318 #endif 319 320 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 321 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 322 static inline struct nfs4_label * 323 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 324 { 325 if (!dst || !src) 326 return NULL; 327 328 if (src->len > NFS4_MAXLABELLEN) 329 return NULL; 330 331 dst->lfs = src->lfs; 332 dst->pi = src->pi; 333 dst->len = src->len; 334 memcpy(dst->label, src->label, src->len); 335 336 return dst; 337 } 338 static inline void nfs4_label_free(struct nfs4_label *label) 339 { 340 if (label) { 341 kfree(label->label); 342 kfree(label); 343 } 344 return; 345 } 346 347 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 348 { 349 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 350 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 351 } 352 #else 353 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 354 static inline void nfs4_label_free(void *label) {} 355 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 356 { 357 } 358 static inline struct nfs4_label * 359 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 360 { 361 return NULL; 362 } 363 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 364 365 /* proc.c */ 366 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 367 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 368 const struct nfs_client_initdata *); 369 370 /* dir.c */ 371 extern void nfs_advise_use_readdirplus(struct inode *dir); 372 extern void nfs_force_use_readdirplus(struct inode *dir); 373 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 374 struct shrink_control *sc); 375 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 376 struct shrink_control *sc); 377 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 378 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 379 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 380 int nfs_rmdir(struct inode *, struct dentry *); 381 int nfs_unlink(struct inode *, struct dentry *); 382 int nfs_symlink(struct inode *, struct dentry *, const char *); 383 int nfs_link(struct dentry *, struct inode *, struct dentry *); 384 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 385 int nfs_rename(struct inode *, struct dentry *, 386 struct inode *, struct dentry *, unsigned int); 387 388 /* file.c */ 389 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 390 loff_t nfs_file_llseek(struct file *, loff_t, int); 391 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 392 int nfs_file_mmap(struct file *, struct vm_area_struct *); 393 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 394 int nfs_file_release(struct inode *, struct file *); 395 int nfs_lock(struct file *, int, struct file_lock *); 396 int nfs_flock(struct file *, int, struct file_lock *); 397 int nfs_check_flags(int); 398 399 /* inode.c */ 400 extern struct workqueue_struct *nfsiod_workqueue; 401 extern struct inode *nfs_alloc_inode(struct super_block *sb); 402 extern void nfs_free_inode(struct inode *); 403 extern int nfs_write_inode(struct inode *, struct writeback_control *); 404 extern int nfs_drop_inode(struct inode *); 405 extern void nfs_clear_inode(struct inode *); 406 extern void nfs_evict_inode(struct inode *); 407 void nfs_zap_acl_cache(struct inode *inode); 408 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 409 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 410 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); 411 412 /* super.c */ 413 extern const struct super_operations nfs_sops; 414 extern struct file_system_type nfs_fs_type; 415 extern struct file_system_type nfs_prepared_fs_type; 416 #if IS_ENABLED(CONFIG_NFS_V4) 417 extern struct file_system_type nfs4_referral_fs_type; 418 #endif 419 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 420 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *); 421 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 422 void nfs_kill_super(struct super_block *); 423 424 extern struct rpc_stat nfs_rpcstat; 425 426 extern int __init register_nfs_fs(void); 427 extern void __exit unregister_nfs_fs(void); 428 extern bool nfs_sb_active(struct super_block *sb); 429 extern void nfs_sb_deactive(struct super_block *sb); 430 431 /* io.c */ 432 extern void nfs_start_io_read(struct inode *inode); 433 extern void nfs_end_io_read(struct inode *inode); 434 extern void nfs_start_io_write(struct inode *inode); 435 extern void nfs_end_io_write(struct inode *inode); 436 extern void nfs_start_io_direct(struct inode *inode); 437 extern void nfs_end_io_direct(struct inode *inode); 438 439 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 440 { 441 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 442 } 443 444 /* namespace.c */ 445 #define NFS_PATH_CANONICAL 1 446 extern char *nfs_path(char **p, struct dentry *dentry, 447 char *buffer, ssize_t buflen, unsigned flags); 448 extern struct vfsmount *nfs_d_automount(struct path *path); 449 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 450 struct nfs_fh *, struct nfs_fattr *); 451 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 452 struct nfs_fattr *, rpc_authflavor_t); 453 454 /* getroot.c */ 455 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 456 const char *); 457 #if IS_ENABLED(CONFIG_NFS_V4) 458 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 459 const char *); 460 461 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 462 #endif 463 464 struct nfs_pgio_completion_ops; 465 /* read.c */ 466 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 467 struct inode *inode, bool force_mds, 468 const struct nfs_pgio_completion_ops *compl_ops); 469 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 470 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 471 472 /* super.c */ 473 void nfs_umount_begin(struct super_block *); 474 int nfs_statfs(struct dentry *, struct kstatfs *); 475 int nfs_show_options(struct seq_file *, struct dentry *); 476 int nfs_show_devname(struct seq_file *, struct dentry *); 477 int nfs_show_path(struct seq_file *, struct dentry *); 478 int nfs_show_stats(struct seq_file *, struct dentry *); 479 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 480 481 /* write.c */ 482 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 483 struct inode *inode, int ioflags, bool force_mds, 484 const struct nfs_pgio_completion_ops *compl_ops); 485 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 486 extern void nfs_commit_free(struct nfs_commit_data *p); 487 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 488 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 489 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 490 struct nfs_commit_data *data, 491 const struct nfs_rpc_ops *nfs_ops, 492 const struct rpc_call_ops *call_ops, 493 int how, int flags); 494 extern void nfs_init_commit(struct nfs_commit_data *data, 495 struct list_head *head, 496 struct pnfs_layout_segment *lseg, 497 struct nfs_commit_info *cinfo); 498 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 499 struct nfs_commit_info *cinfo, int max); 500 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 501 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 502 struct nfs_commit_info *cinfo); 503 void nfs_mark_request_commit(struct nfs_page *req, 504 struct pnfs_layout_segment *lseg, 505 struct nfs_commit_info *cinfo, 506 u32 ds_commit_idx); 507 int nfs_write_need_commit(struct nfs_pgio_header *); 508 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 509 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 510 int how, struct nfs_commit_info *cinfo); 511 void nfs_retry_commit(struct list_head *page_list, 512 struct pnfs_layout_segment *lseg, 513 struct nfs_commit_info *cinfo, 514 u32 ds_commit_idx); 515 void nfs_commitdata_release(struct nfs_commit_data *data); 516 void nfs_request_add_commit_list(struct nfs_page *req, 517 struct nfs_commit_info *cinfo); 518 void nfs_request_add_commit_list_locked(struct nfs_page *req, 519 struct list_head *dst, 520 struct nfs_commit_info *cinfo); 521 void nfs_request_remove_commit_list(struct nfs_page *req, 522 struct nfs_commit_info *cinfo); 523 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 524 struct inode *inode, 525 struct nfs_direct_req *dreq); 526 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 527 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 528 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 529 530 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 531 loff_t lstart, loff_t lend); 532 533 #ifdef CONFIG_NFS_V4_1 534 static inline 535 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 536 { 537 int i; 538 539 for (i = 0; i < cinfo->nbuckets; i++) 540 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 541 } 542 #else 543 static inline 544 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 545 { 546 } 547 #endif 548 549 #ifdef CONFIG_MIGRATION 550 extern int nfs_migrate_page(struct address_space *, 551 struct page *, struct page *, enum migrate_mode); 552 #endif 553 554 static inline int 555 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 556 const struct nfs_write_verifier *v2) 557 { 558 return memcmp(v1->data, v2->data, sizeof(v1->data)); 559 } 560 561 /* unlink.c */ 562 extern struct rpc_task * 563 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 564 struct dentry *old_dentry, struct dentry *new_dentry, 565 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 566 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 567 568 /* direct.c */ 569 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 570 struct nfs_direct_req *dreq); 571 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 572 573 /* nfs4proc.c */ 574 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 575 const struct nfs_client_initdata *); 576 extern int nfs40_walk_client_list(struct nfs_client *clp, 577 struct nfs_client **result, 578 const struct cred *cred); 579 extern int nfs41_walk_client_list(struct nfs_client *clp, 580 struct nfs_client **result, 581 const struct cred *cred); 582 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, 583 struct rpc_xprt *xprt, 584 void *data); 585 586 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 587 { 588 inode = igrab(inode); 589 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 590 iput(inode); 591 inode = NULL; 592 } 593 return inode; 594 } 595 596 static inline void nfs_iput_and_deactive(struct inode *inode) 597 { 598 if (inode != NULL) { 599 struct super_block *sb = inode->i_sb; 600 601 iput(inode); 602 nfs_sb_deactive(sb); 603 } 604 } 605 606 /* 607 * Determine the device name as a string 608 */ 609 static inline char *nfs_devname(struct dentry *dentry, 610 char *buffer, ssize_t buflen) 611 { 612 char *dummy; 613 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 614 } 615 616 /* 617 * Determine the actual block size (and log2 thereof) 618 */ 619 static inline 620 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 621 { 622 /* make sure blocksize is a power of two */ 623 if ((bsize & (bsize - 1)) || nrbitsp) { 624 unsigned char nrbits; 625 626 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 627 ; 628 bsize = 1 << nrbits; 629 if (nrbitsp) 630 *nrbitsp = nrbits; 631 } 632 633 return bsize; 634 } 635 636 /* 637 * Calculate the number of 512byte blocks used. 638 */ 639 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 640 { 641 blkcnt_t used = (tsize + 511) >> 9; 642 return (used > ULONG_MAX) ? ULONG_MAX : used; 643 } 644 645 /* 646 * Compute and set NFS server blocksize 647 */ 648 static inline 649 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 650 { 651 if (bsize < NFS_MIN_FILE_IO_SIZE) 652 bsize = NFS_DEF_FILE_IO_SIZE; 653 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 654 bsize = NFS_MAX_FILE_IO_SIZE; 655 656 return nfs_block_bits(bsize, nrbitsp); 657 } 658 659 /* 660 * Determine the maximum file size for a superblock 661 */ 662 static inline 663 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 664 { 665 sb->s_maxbytes = (loff_t)maxfilesize; 666 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 667 sb->s_maxbytes = MAX_LFS_FILESIZE; 668 } 669 670 /* 671 * Record the page as unstable and mark its inode as dirty. 672 */ 673 static inline 674 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) 675 { 676 if (!cinfo->dreq) { 677 struct inode *inode = page_file_mapping(page)->host; 678 679 inc_node_page_state(page, NR_UNSTABLE_NFS); 680 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE); 681 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 682 } 683 } 684 685 /* 686 * Determine the number of bytes of data the page contains 687 */ 688 static inline 689 unsigned int nfs_page_length(struct page *page) 690 { 691 loff_t i_size = i_size_read(page_file_mapping(page)->host); 692 693 if (i_size > 0) { 694 pgoff_t index = page_index(page); 695 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 696 if (index < end_index) 697 return PAGE_SIZE; 698 if (index == end_index) 699 return ((i_size - 1) & ~PAGE_MASK) + 1; 700 } 701 return 0; 702 } 703 704 /* 705 * Convert a umode to a dirent->d_type 706 */ 707 static inline 708 unsigned char nfs_umode_to_dtype(umode_t mode) 709 { 710 return (mode >> 12) & 15; 711 } 712 713 /* 714 * Determine the number of pages in an array of length 'len' and 715 * with a base offset of 'base' 716 */ 717 static inline 718 unsigned int nfs_page_array_len(unsigned int base, size_t len) 719 { 720 return ((unsigned long)len + (unsigned long)base + 721 PAGE_SIZE - 1) >> PAGE_SHIFT; 722 } 723 724 /* 725 * Convert a struct timespec into a 64-bit change attribute 726 * 727 * This does approximately the same thing as timespec_to_ns(), 728 * but for calculation efficiency, we multiply the seconds by 729 * 1024*1024*1024. 730 */ 731 static inline 732 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts) 733 { 734 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 735 } 736 737 #ifdef CONFIG_CRC32 738 /** 739 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 740 * @fh - pointer to filehandle 741 * 742 * returns a crc32 hash for the filehandle that is compatible with 743 * the one displayed by "wireshark". 744 */ 745 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 746 { 747 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 748 } 749 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 750 { 751 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 752 NFS4_STATEID_OTHER_SIZE); 753 } 754 #else 755 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 756 { 757 return 0; 758 } 759 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 760 { 761 return 0; 762 } 763 #endif 764 765 static inline bool nfs_error_is_fatal(int err) 766 { 767 switch (err) { 768 case -ERESTARTSYS: 769 case -EINTR: 770 case -EACCES: 771 case -EDQUOT: 772 case -EFBIG: 773 case -EIO: 774 case -ENOSPC: 775 case -EROFS: 776 case -ESTALE: 777 case -E2BIG: 778 case -ENOMEM: 779 case -ETIMEDOUT: 780 return true; 781 default: 782 return false; 783 } 784 } 785 786 static inline bool nfs_error_is_fatal_on_server(int err) 787 { 788 switch (err) { 789 case 0: 790 case -ERESTARTSYS: 791 case -EINTR: 792 return false; 793 } 794 return nfs_error_is_fatal(err); 795 } 796 797 /* 798 * Select between a default port value and a user-specified port value. 799 * If a zero value is set, then autobind will be used. 800 */ 801 static inline void nfs_set_port(struct sockaddr *sap, int *port, 802 const unsigned short default_port) 803 { 804 if (*port == NFS_UNSPEC_PORT) 805 *port = default_port; 806 807 rpc_set_port(sap, *port); 808 } 809