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 struct nfs_client_initdata { 60 unsigned long init_flags; 61 const char *hostname; /* Hostname of the server */ 62 const struct sockaddr *addr; /* Address of the server */ 63 const char *nodename; /* Hostname of the client */ 64 const char *ip_addr; /* IP address of the client */ 65 size_t addrlen; 66 struct nfs_subversion *nfs_mod; 67 int proto; 68 u32 minorversion; 69 unsigned int nconnect; 70 struct net *net; 71 const struct rpc_timeout *timeparms; 72 const struct cred *cred; 73 }; 74 75 /* 76 * In-kernel mount arguments 77 */ 78 struct nfs_fs_context { 79 bool internal; 80 bool skip_reconfig_option_check; 81 bool need_mount; 82 bool sloppy; 83 unsigned int flags; /* NFS{,4}_MOUNT_* flags */ 84 unsigned int rsize, wsize; 85 unsigned int timeo, retrans; 86 unsigned int acregmin, acregmax; 87 unsigned int acdirmin, acdirmax; 88 unsigned int namlen; 89 unsigned int options; 90 unsigned int bsize; 91 struct nfs_auth_info auth_info; 92 rpc_authflavor_t selected_flavor; 93 char *client_address; 94 unsigned int version; 95 unsigned int minorversion; 96 char *fscache_uniq; 97 unsigned short protofamily; 98 unsigned short mountfamily; 99 100 struct { 101 union { 102 struct sockaddr address; 103 struct sockaddr_storage _address; 104 }; 105 size_t addrlen; 106 char *hostname; 107 u32 version; 108 int port; 109 unsigned short protocol; 110 } mount_server; 111 112 struct { 113 union { 114 struct sockaddr address; 115 struct sockaddr_storage _address; 116 }; 117 size_t addrlen; 118 char *hostname; 119 char *export_path; 120 int port; 121 unsigned short protocol; 122 unsigned short nconnect; 123 unsigned short export_path_len; 124 } nfs_server; 125 126 struct nfs_fh *mntfh; 127 struct nfs_server *server; 128 struct nfs_subversion *nfs_mod; 129 130 /* Information for a cloned mount. */ 131 struct nfs_clone_mount { 132 struct super_block *sb; 133 struct dentry *dentry; 134 struct nfs_fattr *fattr; 135 unsigned int inherited_bsize; 136 } clone_data; 137 }; 138 139 #define nfs_errorf(fc, fmt, ...) errorf(fc, fmt, ## __VA_ARGS__) 140 #define nfs_invalf(fc, fmt, ...) invalf(fc, fmt, ## __VA_ARGS__) 141 #define nfs_warnf(fc, fmt, ...) warnf(fc, fmt, ## __VA_ARGS__) 142 143 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc) 144 { 145 return fc->fs_private; 146 } 147 148 /* mount_clnt.c */ 149 struct nfs_mount_request { 150 struct sockaddr *sap; 151 size_t salen; 152 char *hostname; 153 char *dirpath; 154 u32 version; 155 unsigned short protocol; 156 struct nfs_fh *fh; 157 int noresvport; 158 unsigned int *auth_flav_len; 159 rpc_authflavor_t *auth_flavs; 160 struct net *net; 161 }; 162 163 extern int nfs_mount(struct nfs_mount_request *info); 164 extern void nfs_umount(const struct nfs_mount_request *info); 165 166 /* client.c */ 167 extern const struct rpc_program nfs_program; 168 extern void nfs_clients_init(struct net *net); 169 extern void nfs_clients_exit(struct net *net); 170 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 171 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 172 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 173 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 174 void nfs_server_insert_lists(struct nfs_server *); 175 void nfs_server_remove_lists(struct nfs_server *); 176 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 177 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 178 rpc_authflavor_t); 179 struct nfs_server *nfs_alloc_server(void); 180 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 181 182 extern void nfs_put_client(struct nfs_client *); 183 extern void nfs_free_client(struct nfs_client *); 184 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 185 extern struct nfs_client * 186 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 187 struct nfs4_sessionid *, u32); 188 extern struct nfs_server *nfs_create_server(struct fs_context *); 189 extern struct nfs_server *nfs4_create_server(struct fs_context *); 190 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *); 191 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 192 struct sockaddr *sap, size_t salen, 193 struct net *net); 194 extern void nfs_free_server(struct nfs_server *server); 195 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 196 struct nfs_fh *, 197 struct nfs_fattr *, 198 rpc_authflavor_t); 199 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 200 extern int nfs_client_init_status(const struct nfs_client *clp); 201 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 202 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 203 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 204 const struct sockaddr *ds_addr, 205 int ds_addrlen, int ds_proto, 206 unsigned int ds_timeo, 207 unsigned int ds_retrans, 208 u32 minor_version); 209 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 210 struct inode *); 211 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 212 const struct sockaddr *ds_addr, int ds_addrlen, 213 int ds_proto, unsigned int ds_timeo, 214 unsigned int ds_retrans); 215 #ifdef CONFIG_PROC_FS 216 extern int __init nfs_fs_proc_init(void); 217 extern void nfs_fs_proc_exit(void); 218 extern int nfs_fs_proc_net_init(struct net *net); 219 extern void nfs_fs_proc_net_exit(struct net *net); 220 #else 221 static inline int nfs_fs_proc_net_init(struct net *net) 222 { 223 return 0; 224 } 225 static inline void nfs_fs_proc_net_exit(struct net *net) 226 { 227 } 228 static inline int nfs_fs_proc_init(void) 229 { 230 return 0; 231 } 232 static inline void nfs_fs_proc_exit(void) 233 { 234 } 235 #endif 236 237 /* callback_xdr.c */ 238 extern const struct svc_version nfs4_callback_version1; 239 extern const struct svc_version nfs4_callback_version4; 240 241 /* fs_context.c */ 242 extern struct file_system_type nfs_fs_type; 243 244 /* pagelist.c */ 245 extern int __init nfs_init_nfspagecache(void); 246 extern void nfs_destroy_nfspagecache(void); 247 extern int __init nfs_init_readpagecache(void); 248 extern void nfs_destroy_readpagecache(void); 249 extern int __init nfs_init_writepagecache(void); 250 extern void nfs_destroy_writepagecache(void); 251 252 extern int __init nfs_init_directcache(void); 253 extern void nfs_destroy_directcache(void); 254 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 255 struct nfs_pgio_header *hdr, 256 void (*release)(struct nfs_pgio_header *hdr)); 257 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 258 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 259 260 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 261 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 262 void nfs_pgio_header_free(struct nfs_pgio_header *); 263 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 264 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 265 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, 266 const struct rpc_call_ops *call_ops, int how, int flags); 267 void nfs_free_request(struct nfs_page *req); 268 struct nfs_pgio_mirror * 269 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 270 271 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 272 const struct nfs_open_context *ctx2) 273 { 274 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; 275 } 276 277 /* nfs2xdr.c */ 278 extern const struct rpc_procinfo nfs_procedures[]; 279 extern int nfs2_decode_dirent(struct xdr_stream *, 280 struct nfs_entry *, bool); 281 282 /* nfs3xdr.c */ 283 extern const struct rpc_procinfo nfs3_procedures[]; 284 extern int nfs3_decode_dirent(struct xdr_stream *, 285 struct nfs_entry *, bool); 286 287 /* nfs4xdr.c */ 288 #if IS_ENABLED(CONFIG_NFS_V4) 289 extern int nfs4_decode_dirent(struct xdr_stream *, 290 struct nfs_entry *, bool); 291 #endif 292 #ifdef CONFIG_NFS_V4_1 293 extern const u32 nfs41_maxread_overhead; 294 extern const u32 nfs41_maxwrite_overhead; 295 extern const u32 nfs41_maxgetdevinfo_overhead; 296 #endif 297 298 /* nfs4proc.c */ 299 #if IS_ENABLED(CONFIG_NFS_V4) 300 extern const struct rpc_procinfo nfs4_procedures[]; 301 #endif 302 303 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 304 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 305 static inline struct nfs4_label * 306 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 307 { 308 if (!dst || !src) 309 return NULL; 310 311 if (src->len > NFS4_MAXLABELLEN) 312 return NULL; 313 314 dst->lfs = src->lfs; 315 dst->pi = src->pi; 316 dst->len = src->len; 317 memcpy(dst->label, src->label, src->len); 318 319 return dst; 320 } 321 static inline void nfs4_label_free(struct nfs4_label *label) 322 { 323 if (label) { 324 kfree(label->label); 325 kfree(label); 326 } 327 return; 328 } 329 330 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 331 { 332 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 333 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 334 } 335 #else 336 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 337 static inline void nfs4_label_free(void *label) {} 338 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 339 { 340 } 341 static inline struct nfs4_label * 342 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 343 { 344 return NULL; 345 } 346 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 347 348 /* proc.c */ 349 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 350 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 351 const struct nfs_client_initdata *); 352 353 /* dir.c */ 354 extern void nfs_advise_use_readdirplus(struct inode *dir); 355 extern void nfs_force_use_readdirplus(struct inode *dir); 356 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 357 struct shrink_control *sc); 358 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 359 struct shrink_control *sc); 360 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 361 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 362 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 363 int nfs_rmdir(struct inode *, struct dentry *); 364 int nfs_unlink(struct inode *, struct dentry *); 365 int nfs_symlink(struct inode *, struct dentry *, const char *); 366 int nfs_link(struct dentry *, struct inode *, struct dentry *); 367 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 368 int nfs_rename(struct inode *, struct dentry *, 369 struct inode *, struct dentry *, unsigned int); 370 371 /* file.c */ 372 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 373 loff_t nfs_file_llseek(struct file *, loff_t, int); 374 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 375 int nfs_file_mmap(struct file *, struct vm_area_struct *); 376 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 377 int nfs_file_release(struct inode *, struct file *); 378 int nfs_lock(struct file *, int, struct file_lock *); 379 int nfs_flock(struct file *, int, struct file_lock *); 380 int nfs_check_flags(int); 381 382 /* inode.c */ 383 extern struct workqueue_struct *nfsiod_workqueue; 384 extern struct inode *nfs_alloc_inode(struct super_block *sb); 385 extern void nfs_free_inode(struct inode *); 386 extern int nfs_write_inode(struct inode *, struct writeback_control *); 387 extern int nfs_drop_inode(struct inode *); 388 extern void nfs_clear_inode(struct inode *); 389 extern void nfs_evict_inode(struct inode *); 390 void nfs_zap_acl_cache(struct inode *inode); 391 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 392 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 393 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); 394 395 /* super.c */ 396 extern const struct super_operations nfs_sops; 397 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 398 int nfs_try_get_tree(struct fs_context *); 399 int nfs_get_tree_common(struct fs_context *); 400 void nfs_kill_super(struct super_block *); 401 402 extern struct rpc_stat nfs_rpcstat; 403 404 extern int __init register_nfs_fs(void); 405 extern void __exit unregister_nfs_fs(void); 406 extern bool nfs_sb_active(struct super_block *sb); 407 extern void nfs_sb_deactive(struct super_block *sb); 408 extern int nfs_client_for_each_server(struct nfs_client *clp, 409 int (*fn)(struct nfs_server *, void *), 410 void *data); 411 /* io.c */ 412 extern void nfs_start_io_read(struct inode *inode); 413 extern void nfs_end_io_read(struct inode *inode); 414 extern void nfs_start_io_write(struct inode *inode); 415 extern void nfs_end_io_write(struct inode *inode); 416 extern void nfs_start_io_direct(struct inode *inode); 417 extern void nfs_end_io_direct(struct inode *inode); 418 419 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 420 { 421 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 422 } 423 424 /* namespace.c */ 425 #define NFS_PATH_CANONICAL 1 426 extern char *nfs_path(char **p, struct dentry *dentry, 427 char *buffer, ssize_t buflen, unsigned flags); 428 extern struct vfsmount *nfs_d_automount(struct path *path); 429 int nfs_submount(struct fs_context *, struct nfs_server *); 430 int nfs_do_submount(struct fs_context *); 431 432 /* getroot.c */ 433 extern int nfs_get_root(struct super_block *s, struct fs_context *fc); 434 #if IS_ENABLED(CONFIG_NFS_V4) 435 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 436 #endif 437 438 struct nfs_pgio_completion_ops; 439 /* read.c */ 440 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 441 struct inode *inode, bool force_mds, 442 const struct nfs_pgio_completion_ops *compl_ops); 443 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 444 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 445 446 /* super.c */ 447 void nfs_umount_begin(struct super_block *); 448 int nfs_statfs(struct dentry *, struct kstatfs *); 449 int nfs_show_options(struct seq_file *, struct dentry *); 450 int nfs_show_devname(struct seq_file *, struct dentry *); 451 int nfs_show_path(struct seq_file *, struct dentry *); 452 int nfs_show_stats(struct seq_file *, struct dentry *); 453 int nfs_reconfigure(struct fs_context *); 454 455 /* write.c */ 456 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 457 struct inode *inode, int ioflags, bool force_mds, 458 const struct nfs_pgio_completion_ops *compl_ops); 459 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 460 extern void nfs_commit_free(struct nfs_commit_data *p); 461 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 462 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 463 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 464 struct nfs_commit_data *data, 465 const struct nfs_rpc_ops *nfs_ops, 466 const struct rpc_call_ops *call_ops, 467 int how, int flags); 468 extern void nfs_init_commit(struct nfs_commit_data *data, 469 struct list_head *head, 470 struct pnfs_layout_segment *lseg, 471 struct nfs_commit_info *cinfo); 472 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 473 struct nfs_commit_info *cinfo, int max); 474 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 475 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 476 struct nfs_commit_info *cinfo); 477 void nfs_mark_request_commit(struct nfs_page *req, 478 struct pnfs_layout_segment *lseg, 479 struct nfs_commit_info *cinfo, 480 u32 ds_commit_idx); 481 int nfs_write_need_commit(struct nfs_pgio_header *); 482 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 483 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 484 int how, struct nfs_commit_info *cinfo); 485 void nfs_retry_commit(struct list_head *page_list, 486 struct pnfs_layout_segment *lseg, 487 struct nfs_commit_info *cinfo, 488 u32 ds_commit_idx); 489 void nfs_commitdata_release(struct nfs_commit_data *data); 490 void nfs_request_add_commit_list(struct nfs_page *req, 491 struct nfs_commit_info *cinfo); 492 void nfs_request_add_commit_list_locked(struct nfs_page *req, 493 struct list_head *dst, 494 struct nfs_commit_info *cinfo); 495 void nfs_request_remove_commit_list(struct nfs_page *req, 496 struct nfs_commit_info *cinfo); 497 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 498 struct inode *inode, 499 struct nfs_direct_req *dreq); 500 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 501 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 502 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 503 504 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 505 loff_t lstart, loff_t lend); 506 507 #ifdef CONFIG_NFS_V4_1 508 static inline void 509 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets, 510 unsigned int nbuckets) 511 { 512 unsigned int i; 513 514 for (i = 0; i < nbuckets; i++) 515 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 516 } 517 static inline 518 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 519 { 520 struct pnfs_commit_array *array; 521 522 rcu_read_lock(); 523 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list) 524 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets, 525 array->nbuckets); 526 rcu_read_unlock(); 527 } 528 #else 529 static inline 530 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 531 { 532 } 533 #endif 534 535 #ifdef CONFIG_MIGRATION 536 extern int nfs_migrate_page(struct address_space *, 537 struct page *, struct page *, enum migrate_mode); 538 #endif 539 540 static inline int 541 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 542 const struct nfs_write_verifier *v2) 543 { 544 return memcmp(v1->data, v2->data, sizeof(v1->data)); 545 } 546 547 static inline bool 548 nfs_write_match_verf(const struct nfs_writeverf *verf, 549 struct nfs_page *req) 550 { 551 return verf->committed > NFS_UNSTABLE && 552 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier); 553 } 554 555 /* unlink.c */ 556 extern struct rpc_task * 557 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 558 struct dentry *old_dentry, struct dentry *new_dentry, 559 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 560 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 561 562 /* direct.c */ 563 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 564 struct nfs_direct_req *dreq); 565 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 566 567 /* nfs4proc.c */ 568 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 569 const struct nfs_client_initdata *); 570 extern int nfs40_walk_client_list(struct nfs_client *clp, 571 struct nfs_client **result, 572 const struct cred *cred); 573 extern int nfs41_walk_client_list(struct nfs_client *clp, 574 struct nfs_client **result, 575 const struct cred *cred); 576 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, 577 struct rpc_xprt *xprt, 578 void *data); 579 580 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 581 { 582 inode = igrab(inode); 583 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 584 iput(inode); 585 inode = NULL; 586 } 587 return inode; 588 } 589 590 static inline void nfs_iput_and_deactive(struct inode *inode) 591 { 592 if (inode != NULL) { 593 struct super_block *sb = inode->i_sb; 594 595 iput(inode); 596 nfs_sb_deactive(sb); 597 } 598 } 599 600 /* 601 * Determine the device name as a string 602 */ 603 static inline char *nfs_devname(struct dentry *dentry, 604 char *buffer, ssize_t buflen) 605 { 606 char *dummy; 607 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 608 } 609 610 /* 611 * Determine the actual block size (and log2 thereof) 612 */ 613 static inline 614 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 615 { 616 /* make sure blocksize is a power of two */ 617 if ((bsize & (bsize - 1)) || nrbitsp) { 618 unsigned char nrbits; 619 620 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 621 ; 622 bsize = 1 << nrbits; 623 if (nrbitsp) 624 *nrbitsp = nrbits; 625 } 626 627 return bsize; 628 } 629 630 /* 631 * Calculate the number of 512byte blocks used. 632 */ 633 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 634 { 635 blkcnt_t used = (tsize + 511) >> 9; 636 return (used > ULONG_MAX) ? ULONG_MAX : used; 637 } 638 639 /* 640 * Compute and set NFS server blocksize 641 */ 642 static inline 643 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 644 { 645 if (bsize < NFS_MIN_FILE_IO_SIZE) 646 bsize = NFS_DEF_FILE_IO_SIZE; 647 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 648 bsize = NFS_MAX_FILE_IO_SIZE; 649 650 return nfs_block_bits(bsize, nrbitsp); 651 } 652 653 /* 654 * Determine the maximum file size for a superblock 655 */ 656 static inline 657 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 658 { 659 sb->s_maxbytes = (loff_t)maxfilesize; 660 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 661 sb->s_maxbytes = MAX_LFS_FILESIZE; 662 } 663 664 /* 665 * Record the page as unstable (an extra writeback period) and mark its 666 * inode as dirty. 667 */ 668 static inline 669 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) 670 { 671 if (!cinfo->dreq) { 672 struct inode *inode = page_file_mapping(page)->host; 673 674 /* This page is really still in write-back - just that the 675 * writeback is happening on the server now. 676 */ 677 inc_node_page_state(page, NR_WRITEBACK); 678 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK); 679 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 680 } 681 } 682 683 /* 684 * Determine the number of bytes of data the page contains 685 */ 686 static inline 687 unsigned int nfs_page_length(struct page *page) 688 { 689 loff_t i_size = i_size_read(page_file_mapping(page)->host); 690 691 if (i_size > 0) { 692 pgoff_t index = page_index(page); 693 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 694 if (index < end_index) 695 return PAGE_SIZE; 696 if (index == end_index) 697 return ((i_size - 1) & ~PAGE_MASK) + 1; 698 } 699 return 0; 700 } 701 702 /* 703 * Convert a umode to a dirent->d_type 704 */ 705 static inline 706 unsigned char nfs_umode_to_dtype(umode_t mode) 707 { 708 return (mode >> 12) & 15; 709 } 710 711 /* 712 * Determine the number of pages in an array of length 'len' and 713 * with a base offset of 'base' 714 */ 715 static inline 716 unsigned int nfs_page_array_len(unsigned int base, size_t len) 717 { 718 return ((unsigned long)len + (unsigned long)base + 719 PAGE_SIZE - 1) >> PAGE_SHIFT; 720 } 721 722 /* 723 * Convert a struct timespec64 into a 64-bit change attribute 724 * 725 * This does approximately the same thing as timespec64_to_ns(), 726 * but for calculation efficiency, we multiply the seconds by 727 * 1024*1024*1024. 728 */ 729 static inline 730 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts) 731 { 732 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 733 } 734 735 #ifdef CONFIG_CRC32 736 /** 737 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 738 * @fh - pointer to filehandle 739 * 740 * returns a crc32 hash for the filehandle that is compatible with 741 * the one displayed by "wireshark". 742 */ 743 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 744 { 745 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 746 } 747 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 748 { 749 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 750 NFS4_STATEID_OTHER_SIZE); 751 } 752 #else 753 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 754 { 755 return 0; 756 } 757 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 758 { 759 return 0; 760 } 761 #endif 762 763 static inline bool nfs_error_is_fatal(int err) 764 { 765 switch (err) { 766 case -ERESTARTSYS: 767 case -EINTR: 768 case -EACCES: 769 case -EDQUOT: 770 case -EFBIG: 771 case -EIO: 772 case -ENOSPC: 773 case -EROFS: 774 case -ESTALE: 775 case -E2BIG: 776 case -ENOMEM: 777 case -ETIMEDOUT: 778 return true; 779 default: 780 return false; 781 } 782 } 783 784 static inline bool nfs_error_is_fatal_on_server(int err) 785 { 786 switch (err) { 787 case 0: 788 case -ERESTARTSYS: 789 case -EINTR: 790 return false; 791 } 792 return nfs_error_is_fatal(err); 793 } 794 795 /* 796 * Select between a default port value and a user-specified port value. 797 * If a zero value is set, then autobind will be used. 798 */ 799 static inline void nfs_set_port(struct sockaddr *sap, int *port, 800 const unsigned short default_port) 801 { 802 if (*port == NFS_UNSPEC_PORT) 803 *port = default_port; 804 805 rpc_set_port(sap, *port); 806 } 807