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_SB_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 static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry) 37 { 38 if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL)) 39 return false; 40 if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size) 41 return false; 42 return true; 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 bool internal; 86 bool skip_reconfig_option_check; 87 bool need_mount; 88 bool sloppy; 89 unsigned int flags; /* NFS{,4}_MOUNT_* flags */ 90 unsigned int rsize, wsize; 91 unsigned int timeo, retrans; 92 unsigned int acregmin, acregmax; 93 unsigned int acdirmin, acdirmax; 94 unsigned int namlen; 95 unsigned int options; 96 unsigned int bsize; 97 struct nfs_auth_info auth_info; 98 rpc_authflavor_t selected_flavor; 99 char *client_address; 100 unsigned int version; 101 unsigned int minorversion; 102 char *fscache_uniq; 103 unsigned short protofamily; 104 unsigned short mountfamily; 105 106 struct { 107 union { 108 struct sockaddr address; 109 struct sockaddr_storage _address; 110 }; 111 size_t addrlen; 112 char *hostname; 113 u32 version; 114 int port; 115 unsigned short protocol; 116 } mount_server; 117 118 struct { 119 union { 120 struct sockaddr address; 121 struct sockaddr_storage _address; 122 }; 123 size_t addrlen; 124 char *hostname; 125 char *export_path; 126 int port; 127 unsigned short protocol; 128 unsigned short nconnect; 129 unsigned short export_path_len; 130 } nfs_server; 131 132 struct nfs_fh *mntfh; 133 struct nfs_server *server; 134 struct nfs_subversion *nfs_mod; 135 136 /* Information for a cloned mount. */ 137 struct nfs_clone_mount { 138 struct super_block *sb; 139 struct dentry *dentry; 140 struct nfs_fattr *fattr; 141 unsigned int inherited_bsize; 142 } clone_data; 143 }; 144 145 #define nfs_errorf(fc, fmt, ...) errorf(fc, fmt, ## __VA_ARGS__) 146 #define nfs_invalf(fc, fmt, ...) invalf(fc, fmt, ## __VA_ARGS__) 147 #define nfs_warnf(fc, fmt, ...) warnf(fc, fmt, ## __VA_ARGS__) 148 149 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc) 150 { 151 return fc->fs_private; 152 } 153 154 /* mount_clnt.c */ 155 struct nfs_mount_request { 156 struct sockaddr *sap; 157 size_t salen; 158 char *hostname; 159 char *dirpath; 160 u32 version; 161 unsigned short protocol; 162 struct nfs_fh *fh; 163 int noresvport; 164 unsigned int *auth_flav_len; 165 rpc_authflavor_t *auth_flavs; 166 struct net *net; 167 }; 168 169 extern int nfs_mount(struct nfs_mount_request *info); 170 extern void nfs_umount(const struct nfs_mount_request *info); 171 172 /* client.c */ 173 extern const struct rpc_program nfs_program; 174 extern void nfs_clients_init(struct net *net); 175 extern void nfs_clients_exit(struct net *net); 176 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 177 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 178 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 179 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 180 void nfs_server_insert_lists(struct nfs_server *); 181 void nfs_server_remove_lists(struct nfs_server *); 182 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 183 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 184 rpc_authflavor_t); 185 struct nfs_server *nfs_alloc_server(void); 186 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 187 188 extern void nfs_put_client(struct nfs_client *); 189 extern void nfs_free_client(struct nfs_client *); 190 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 191 extern struct nfs_client * 192 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 193 struct nfs4_sessionid *, u32); 194 extern struct nfs_server *nfs_create_server(struct fs_context *); 195 extern struct nfs_server *nfs4_create_server(struct fs_context *); 196 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *); 197 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 198 struct sockaddr *sap, size_t salen, 199 struct net *net); 200 extern void nfs_free_server(struct nfs_server *server); 201 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 202 struct nfs_fh *, 203 struct nfs_fattr *, 204 rpc_authflavor_t); 205 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 206 extern int nfs_client_init_status(const struct nfs_client *clp); 207 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 208 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 209 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 210 const struct sockaddr *ds_addr, 211 int ds_addrlen, int ds_proto, 212 unsigned int ds_timeo, 213 unsigned int ds_retrans, 214 u32 minor_version); 215 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 216 struct inode *); 217 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 218 const struct sockaddr *ds_addr, int ds_addrlen, 219 int ds_proto, unsigned int ds_timeo, 220 unsigned int ds_retrans); 221 #ifdef CONFIG_PROC_FS 222 extern int __init nfs_fs_proc_init(void); 223 extern void nfs_fs_proc_exit(void); 224 extern int nfs_fs_proc_net_init(struct net *net); 225 extern void nfs_fs_proc_net_exit(struct net *net); 226 #else 227 static inline int nfs_fs_proc_net_init(struct net *net) 228 { 229 return 0; 230 } 231 static inline void nfs_fs_proc_net_exit(struct net *net) 232 { 233 } 234 static inline int nfs_fs_proc_init(void) 235 { 236 return 0; 237 } 238 static inline void nfs_fs_proc_exit(void) 239 { 240 } 241 #endif 242 243 /* callback_xdr.c */ 244 extern const struct svc_version nfs4_callback_version1; 245 extern const struct svc_version nfs4_callback_version4; 246 247 /* fs_context.c */ 248 extern struct file_system_type nfs_fs_type; 249 250 /* pagelist.c */ 251 extern int __init nfs_init_nfspagecache(void); 252 extern void nfs_destroy_nfspagecache(void); 253 extern int __init nfs_init_readpagecache(void); 254 extern void nfs_destroy_readpagecache(void); 255 extern int __init nfs_init_writepagecache(void); 256 extern void nfs_destroy_writepagecache(void); 257 258 extern int __init nfs_init_directcache(void); 259 extern void nfs_destroy_directcache(void); 260 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 261 struct nfs_pgio_header *hdr, 262 void (*release)(struct nfs_pgio_header *hdr)); 263 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 264 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 265 266 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 267 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 268 void nfs_pgio_header_free(struct nfs_pgio_header *); 269 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 270 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 271 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, 272 const struct rpc_call_ops *call_ops, int how, int flags); 273 void nfs_free_request(struct nfs_page *req); 274 struct nfs_pgio_mirror * 275 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 276 277 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 278 const struct nfs_open_context *ctx2) 279 { 280 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; 281 } 282 283 /* nfs2xdr.c */ 284 extern const struct rpc_procinfo nfs_procedures[]; 285 extern int nfs2_decode_dirent(struct xdr_stream *, 286 struct nfs_entry *, bool); 287 288 /* nfs3xdr.c */ 289 extern const struct rpc_procinfo nfs3_procedures[]; 290 extern int nfs3_decode_dirent(struct xdr_stream *, 291 struct nfs_entry *, bool); 292 293 /* nfs4xdr.c */ 294 #if IS_ENABLED(CONFIG_NFS_V4) 295 extern int nfs4_decode_dirent(struct xdr_stream *, 296 struct nfs_entry *, bool); 297 #endif 298 #ifdef CONFIG_NFS_V4_1 299 extern const u32 nfs41_maxread_overhead; 300 extern const u32 nfs41_maxwrite_overhead; 301 extern const u32 nfs41_maxgetdevinfo_overhead; 302 #endif 303 304 /* nfs4proc.c */ 305 #if IS_ENABLED(CONFIG_NFS_V4) 306 extern const struct rpc_procinfo nfs4_procedures[]; 307 #endif 308 309 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 310 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 311 static inline struct nfs4_label * 312 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 313 { 314 if (!dst || !src) 315 return NULL; 316 317 if (src->len > NFS4_MAXLABELLEN) 318 return NULL; 319 320 dst->lfs = src->lfs; 321 dst->pi = src->pi; 322 dst->len = src->len; 323 memcpy(dst->label, src->label, src->len); 324 325 return dst; 326 } 327 static inline void nfs4_label_free(struct nfs4_label *label) 328 { 329 if (label) { 330 kfree(label->label); 331 kfree(label); 332 } 333 return; 334 } 335 336 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 337 { 338 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 339 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 340 } 341 #else 342 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 343 static inline void nfs4_label_free(void *label) {} 344 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 345 { 346 } 347 static inline struct nfs4_label * 348 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 349 { 350 return NULL; 351 } 352 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 353 354 /* proc.c */ 355 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 356 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 357 const struct nfs_client_initdata *); 358 359 /* dir.c */ 360 extern void nfs_advise_use_readdirplus(struct inode *dir); 361 extern void nfs_force_use_readdirplus(struct inode *dir); 362 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 363 struct shrink_control *sc); 364 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 365 struct shrink_control *sc); 366 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 367 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 368 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 369 int nfs_rmdir(struct inode *, struct dentry *); 370 int nfs_unlink(struct inode *, struct dentry *); 371 int nfs_symlink(struct inode *, struct dentry *, const char *); 372 int nfs_link(struct dentry *, struct inode *, struct dentry *); 373 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 374 int nfs_rename(struct inode *, struct dentry *, 375 struct inode *, struct dentry *, unsigned int); 376 377 /* file.c */ 378 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 379 loff_t nfs_file_llseek(struct file *, loff_t, int); 380 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 381 int nfs_file_mmap(struct file *, struct vm_area_struct *); 382 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 383 int nfs_file_release(struct inode *, struct file *); 384 int nfs_lock(struct file *, int, struct file_lock *); 385 int nfs_flock(struct file *, int, struct file_lock *); 386 int nfs_check_flags(int); 387 388 /* inode.c */ 389 extern struct workqueue_struct *nfsiod_workqueue; 390 extern struct inode *nfs_alloc_inode(struct super_block *sb); 391 extern void nfs_free_inode(struct inode *); 392 extern int nfs_write_inode(struct inode *, struct writeback_control *); 393 extern int nfs_drop_inode(struct inode *); 394 extern void nfs_clear_inode(struct inode *); 395 extern void nfs_evict_inode(struct inode *); 396 void nfs_zap_acl_cache(struct inode *inode); 397 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 398 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 399 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); 400 401 /* super.c */ 402 extern const struct super_operations nfs_sops; 403 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 404 int nfs_try_get_tree(struct fs_context *); 405 int nfs_get_tree_common(struct fs_context *); 406 void nfs_kill_super(struct super_block *); 407 408 extern struct rpc_stat nfs_rpcstat; 409 410 extern int __init register_nfs_fs(void); 411 extern void __exit unregister_nfs_fs(void); 412 extern bool nfs_sb_active(struct super_block *sb); 413 extern void nfs_sb_deactive(struct super_block *sb); 414 extern int nfs_client_for_each_server(struct nfs_client *clp, 415 int (*fn)(struct nfs_server *, void *), 416 void *data); 417 /* io.c */ 418 extern void nfs_start_io_read(struct inode *inode); 419 extern void nfs_end_io_read(struct inode *inode); 420 extern void nfs_start_io_write(struct inode *inode); 421 extern void nfs_end_io_write(struct inode *inode); 422 extern void nfs_start_io_direct(struct inode *inode); 423 extern void nfs_end_io_direct(struct inode *inode); 424 425 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 426 { 427 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 428 } 429 430 /* namespace.c */ 431 #define NFS_PATH_CANONICAL 1 432 extern char *nfs_path(char **p, struct dentry *dentry, 433 char *buffer, ssize_t buflen, unsigned flags); 434 extern struct vfsmount *nfs_d_automount(struct path *path); 435 int nfs_submount(struct fs_context *, struct nfs_server *); 436 int nfs_do_submount(struct fs_context *); 437 438 /* getroot.c */ 439 extern int nfs_get_root(struct super_block *s, struct fs_context *fc); 440 #if IS_ENABLED(CONFIG_NFS_V4) 441 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 442 #endif 443 444 struct nfs_pgio_completion_ops; 445 /* read.c */ 446 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 447 struct inode *inode, bool force_mds, 448 const struct nfs_pgio_completion_ops *compl_ops); 449 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 450 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 451 452 /* super.c */ 453 void nfs_umount_begin(struct super_block *); 454 int nfs_statfs(struct dentry *, struct kstatfs *); 455 int nfs_show_options(struct seq_file *, struct dentry *); 456 int nfs_show_devname(struct seq_file *, struct dentry *); 457 int nfs_show_path(struct seq_file *, struct dentry *); 458 int nfs_show_stats(struct seq_file *, struct dentry *); 459 int nfs_reconfigure(struct fs_context *); 460 461 /* write.c */ 462 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 463 struct inode *inode, int ioflags, bool force_mds, 464 const struct nfs_pgio_completion_ops *compl_ops); 465 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 466 extern void nfs_commit_free(struct nfs_commit_data *p); 467 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 468 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 469 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 470 struct nfs_commit_data *data, 471 const struct nfs_rpc_ops *nfs_ops, 472 const struct rpc_call_ops *call_ops, 473 int how, int flags); 474 extern void nfs_init_commit(struct nfs_commit_data *data, 475 struct list_head *head, 476 struct pnfs_layout_segment *lseg, 477 struct nfs_commit_info *cinfo); 478 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 479 struct nfs_commit_info *cinfo, int max); 480 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 481 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 482 struct nfs_commit_info *cinfo); 483 void nfs_mark_request_commit(struct nfs_page *req, 484 struct pnfs_layout_segment *lseg, 485 struct nfs_commit_info *cinfo, 486 u32 ds_commit_idx); 487 int nfs_write_need_commit(struct nfs_pgio_header *); 488 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 489 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 490 int how, struct nfs_commit_info *cinfo); 491 void nfs_retry_commit(struct list_head *page_list, 492 struct pnfs_layout_segment *lseg, 493 struct nfs_commit_info *cinfo, 494 u32 ds_commit_idx); 495 void nfs_commitdata_release(struct nfs_commit_data *data); 496 void nfs_request_add_commit_list(struct nfs_page *req, 497 struct nfs_commit_info *cinfo); 498 void nfs_request_add_commit_list_locked(struct nfs_page *req, 499 struct list_head *dst, 500 struct nfs_commit_info *cinfo); 501 void nfs_request_remove_commit_list(struct nfs_page *req, 502 struct nfs_commit_info *cinfo); 503 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 504 struct inode *inode, 505 struct nfs_direct_req *dreq); 506 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 507 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 508 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 509 510 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 511 loff_t lstart, loff_t lend); 512 513 #ifdef CONFIG_NFS_V4_1 514 static inline void 515 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets, 516 unsigned int nbuckets) 517 { 518 unsigned int i; 519 520 for (i = 0; i < nbuckets; i++) 521 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 522 } 523 static inline 524 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 525 { 526 struct pnfs_commit_array *array; 527 528 rcu_read_lock(); 529 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list) 530 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets, 531 array->nbuckets); 532 rcu_read_unlock(); 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 static inline bool 554 nfs_write_match_verf(const struct nfs_writeverf *verf, 555 struct nfs_page *req) 556 { 557 return verf->committed > NFS_UNSTABLE && 558 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier); 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 (an extra writeback period) and mark its 672 * inode as dirty. 673 */ 674 static inline 675 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) 676 { 677 if (!cinfo->dreq) { 678 struct inode *inode = page_file_mapping(page)->host; 679 680 /* This page is really still in write-back - just that the 681 * writeback is happening on the server now. 682 */ 683 inc_node_page_state(page, NR_WRITEBACK); 684 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK); 685 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 686 } 687 } 688 689 /* 690 * Determine the number of bytes of data the page contains 691 */ 692 static inline 693 unsigned int nfs_page_length(struct page *page) 694 { 695 loff_t i_size = i_size_read(page_file_mapping(page)->host); 696 697 if (i_size > 0) { 698 pgoff_t index = page_index(page); 699 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 700 if (index < end_index) 701 return PAGE_SIZE; 702 if (index == end_index) 703 return ((i_size - 1) & ~PAGE_MASK) + 1; 704 } 705 return 0; 706 } 707 708 /* 709 * Convert a umode to a dirent->d_type 710 */ 711 static inline 712 unsigned char nfs_umode_to_dtype(umode_t mode) 713 { 714 return (mode >> 12) & 15; 715 } 716 717 /* 718 * Determine the number of pages in an array of length 'len' and 719 * with a base offset of 'base' 720 */ 721 static inline 722 unsigned int nfs_page_array_len(unsigned int base, size_t len) 723 { 724 return ((unsigned long)len + (unsigned long)base + 725 PAGE_SIZE - 1) >> PAGE_SHIFT; 726 } 727 728 /* 729 * Convert a struct timespec64 into a 64-bit change attribute 730 * 731 * This does approximately the same thing as timespec64_to_ns(), 732 * but for calculation efficiency, we multiply the seconds by 733 * 1024*1024*1024. 734 */ 735 static inline 736 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts) 737 { 738 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 739 } 740 741 #ifdef CONFIG_CRC32 742 /** 743 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 744 * @fh - pointer to filehandle 745 * 746 * returns a crc32 hash for the filehandle that is compatible with 747 * the one displayed by "wireshark". 748 */ 749 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 750 { 751 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 752 } 753 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 754 { 755 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 756 NFS4_STATEID_OTHER_SIZE); 757 } 758 #else 759 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 760 { 761 return 0; 762 } 763 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 764 { 765 return 0; 766 } 767 #endif 768 769 static inline bool nfs_error_is_fatal(int err) 770 { 771 switch (err) { 772 case -ERESTARTSYS: 773 case -EINTR: 774 case -EACCES: 775 case -EDQUOT: 776 case -EFBIG: 777 case -EIO: 778 case -ENOSPC: 779 case -EROFS: 780 case -ESTALE: 781 case -E2BIG: 782 case -ENOMEM: 783 case -ETIMEDOUT: 784 return true; 785 default: 786 return false; 787 } 788 } 789 790 static inline bool nfs_error_is_fatal_on_server(int err) 791 { 792 switch (err) { 793 case 0: 794 case -ERESTARTSYS: 795 case -EINTR: 796 return false; 797 } 798 return nfs_error_is_fatal(err); 799 } 800 801 /* 802 * Select between a default port value and a user-specified port value. 803 * If a zero value is set, then autobind will be used. 804 */ 805 static inline void nfs_set_port(struct sockaddr *sap, int *port, 806 const unsigned short default_port) 807 { 808 if (*port == NFS_UNSPEC_PORT) 809 *port = default_port; 810 811 rpc_set_port(sap, *port); 812 } 813