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/nfs_page.h> 11 #include <linux/wait_bit.h> 12 13 #define NFS_MS_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS) 14 15 extern const struct export_operations nfs_export_ops; 16 17 struct nfs_string; 18 19 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 20 { 21 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 22 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 23 } 24 25 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 26 { 27 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 28 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 29 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 30 return 0; 31 return 1; 32 } 33 34 struct nfs_clone_mount { 35 const struct super_block *sb; 36 const struct dentry *dentry; 37 struct nfs_fh *fh; 38 struct nfs_fattr *fattr; 39 char *hostname; 40 char *mnt_path; 41 struct sockaddr *addr; 42 size_t addrlen; 43 rpc_authflavor_t authflavor; 44 }; 45 46 /* 47 * Note: RFC 1813 doesn't limit the number of auth flavors that 48 * a server can return, so make something up. 49 */ 50 #define NFS_MAX_SECFLAVORS (12) 51 52 /* 53 * Value used if the user did not specify a port value. 54 */ 55 #define NFS_UNSPEC_PORT (-1) 56 57 #define NFS_UNSPEC_RETRANS (UINT_MAX) 58 #define NFS_UNSPEC_TIMEO (UINT_MAX) 59 60 /* 61 * Maximum number of pages that readdir can use for creating 62 * a vmapped array of pages. 63 */ 64 #define NFS_MAX_READDIR_PAGES 8 65 66 struct nfs_client_initdata { 67 unsigned long init_flags; 68 const char *hostname; /* Hostname of the server */ 69 const struct sockaddr *addr; /* Address of the server */ 70 const char *nodename; /* Hostname of the client */ 71 const char *ip_addr; /* IP address of the client */ 72 size_t addrlen; 73 struct nfs_subversion *nfs_mod; 74 int proto; 75 u32 minorversion; 76 unsigned int nconnect; 77 struct net *net; 78 const struct rpc_timeout *timeparms; 79 const struct cred *cred; 80 }; 81 82 /* 83 * In-kernel mount arguments 84 */ 85 struct nfs_parsed_mount_data { 86 int flags; 87 unsigned int rsize, wsize; 88 unsigned int timeo, retrans; 89 unsigned int acregmin, acregmax, 90 acdirmin, acdirmax; 91 unsigned int namlen; 92 unsigned int options; 93 unsigned int bsize; 94 struct nfs_auth_info auth_info; 95 rpc_authflavor_t selected_flavor; 96 char *client_address; 97 unsigned int version; 98 unsigned int minorversion; 99 char *fscache_uniq; 100 bool need_mount; 101 102 struct { 103 struct sockaddr_storage address; 104 size_t addrlen; 105 char *hostname; 106 u32 version; 107 int port; 108 unsigned short protocol; 109 } mount_server; 110 111 struct { 112 struct sockaddr_storage address; 113 size_t addrlen; 114 char *hostname; 115 char *export_path; 116 int port; 117 unsigned short protocol; 118 unsigned short nconnect; 119 } nfs_server; 120 121 void *lsm_opts; 122 struct net *net; 123 }; 124 125 /* mount_clnt.c */ 126 struct nfs_mount_request { 127 struct sockaddr *sap; 128 size_t salen; 129 char *hostname; 130 char *dirpath; 131 u32 version; 132 unsigned short protocol; 133 struct nfs_fh *fh; 134 int noresvport; 135 unsigned int *auth_flav_len; 136 rpc_authflavor_t *auth_flavs; 137 struct net *net; 138 }; 139 140 struct nfs_mount_info { 141 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 142 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 143 struct nfs_parsed_mount_data *parsed; 144 struct nfs_clone_mount *cloned; 145 struct nfs_fh *mntfh; 146 }; 147 148 extern int nfs_mount(struct nfs_mount_request *info); 149 extern void nfs_umount(const struct nfs_mount_request *info); 150 151 /* client.c */ 152 extern const struct rpc_program nfs_program; 153 extern void nfs_clients_init(struct net *net); 154 extern void nfs_clients_exit(struct net *net); 155 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 156 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 157 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 158 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 159 void nfs_server_insert_lists(struct nfs_server *); 160 void nfs_server_remove_lists(struct nfs_server *); 161 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 162 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 163 rpc_authflavor_t); 164 struct nfs_server *nfs_alloc_server(void); 165 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 166 167 extern void nfs_put_client(struct nfs_client *); 168 extern void nfs_free_client(struct nfs_client *); 169 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 170 extern struct nfs_client * 171 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 172 struct nfs4_sessionid *, u32); 173 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 174 struct nfs_subversion *); 175 extern struct nfs_server *nfs4_create_server( 176 struct nfs_mount_info *, 177 struct nfs_subversion *); 178 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 179 struct nfs_fh *); 180 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 181 struct sockaddr *sap, size_t salen, 182 struct net *net); 183 extern void nfs_free_server(struct nfs_server *server); 184 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 185 struct nfs_fh *, 186 struct nfs_fattr *, 187 rpc_authflavor_t); 188 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 189 extern int nfs_client_init_status(const struct nfs_client *clp); 190 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 191 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 192 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 193 const struct sockaddr *ds_addr, 194 int ds_addrlen, int ds_proto, 195 unsigned int ds_timeo, 196 unsigned int ds_retrans, 197 u32 minor_version); 198 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 199 struct inode *); 200 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 201 const struct sockaddr *ds_addr, int ds_addrlen, 202 int ds_proto, unsigned int ds_timeo, 203 unsigned int ds_retrans); 204 #ifdef CONFIG_PROC_FS 205 extern int __init nfs_fs_proc_init(void); 206 extern void nfs_fs_proc_exit(void); 207 extern int nfs_fs_proc_net_init(struct net *net); 208 extern void nfs_fs_proc_net_exit(struct net *net); 209 #else 210 static inline int nfs_fs_proc_net_init(struct net *net) 211 { 212 return 0; 213 } 214 static inline void nfs_fs_proc_net_exit(struct net *net) 215 { 216 } 217 static inline int nfs_fs_proc_init(void) 218 { 219 return 0; 220 } 221 static inline void nfs_fs_proc_exit(void) 222 { 223 } 224 #endif 225 226 /* callback_xdr.c */ 227 extern const struct svc_version nfs4_callback_version1; 228 extern const struct svc_version nfs4_callback_version4; 229 230 struct nfs_pageio_descriptor; 231 /* pagelist.c */ 232 extern int __init nfs_init_nfspagecache(void); 233 extern void nfs_destroy_nfspagecache(void); 234 extern int __init nfs_init_readpagecache(void); 235 extern void nfs_destroy_readpagecache(void); 236 extern int __init nfs_init_writepagecache(void); 237 extern void nfs_destroy_writepagecache(void); 238 239 extern int __init nfs_init_directcache(void); 240 extern void nfs_destroy_directcache(void); 241 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 242 struct nfs_pgio_header *hdr, 243 void (*release)(struct nfs_pgio_header *hdr)); 244 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 245 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 246 247 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 248 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 249 void nfs_pgio_header_free(struct nfs_pgio_header *); 250 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 251 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 252 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, 253 const struct rpc_call_ops *call_ops, int how, int flags); 254 void nfs_free_request(struct nfs_page *req); 255 struct nfs_pgio_mirror * 256 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 257 258 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc) 259 { 260 WARN_ON_ONCE(desc->pg_mirror_count < 1); 261 return desc->pg_mirror_count > 1; 262 } 263 264 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 265 const struct nfs_open_context *ctx2) 266 { 267 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; 268 } 269 270 /* nfs2xdr.c */ 271 extern const struct rpc_procinfo nfs_procedures[]; 272 extern int nfs2_decode_dirent(struct xdr_stream *, 273 struct nfs_entry *, bool); 274 275 /* nfs3xdr.c */ 276 extern const struct rpc_procinfo nfs3_procedures[]; 277 extern int nfs3_decode_dirent(struct xdr_stream *, 278 struct nfs_entry *, bool); 279 280 /* nfs4xdr.c */ 281 #if IS_ENABLED(CONFIG_NFS_V4) 282 extern int nfs4_decode_dirent(struct xdr_stream *, 283 struct nfs_entry *, bool); 284 #endif 285 #ifdef CONFIG_NFS_V4_1 286 extern const u32 nfs41_maxread_overhead; 287 extern const u32 nfs41_maxwrite_overhead; 288 extern const u32 nfs41_maxgetdevinfo_overhead; 289 #endif 290 291 /* nfs4proc.c */ 292 #if IS_ENABLED(CONFIG_NFS_V4) 293 extern const struct rpc_procinfo nfs4_procedures[]; 294 #endif 295 296 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 297 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 298 static inline struct nfs4_label * 299 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 300 { 301 if (!dst || !src) 302 return NULL; 303 304 if (src->len > NFS4_MAXLABELLEN) 305 return NULL; 306 307 dst->lfs = src->lfs; 308 dst->pi = src->pi; 309 dst->len = src->len; 310 memcpy(dst->label, src->label, src->len); 311 312 return dst; 313 } 314 static inline void nfs4_label_free(struct nfs4_label *label) 315 { 316 if (label) { 317 kfree(label->label); 318 kfree(label); 319 } 320 return; 321 } 322 323 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 324 { 325 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 326 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 327 } 328 #else 329 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 330 static inline void nfs4_label_free(void *label) {} 331 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 332 { 333 } 334 static inline struct nfs4_label * 335 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 336 { 337 return NULL; 338 } 339 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 340 341 /* proc.c */ 342 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 343 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 344 const struct nfs_client_initdata *); 345 346 /* dir.c */ 347 extern void nfs_advise_use_readdirplus(struct inode *dir); 348 extern void nfs_force_use_readdirplus(struct inode *dir); 349 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 350 struct shrink_control *sc); 351 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 352 struct shrink_control *sc); 353 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 354 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 355 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 356 int nfs_rmdir(struct inode *, struct dentry *); 357 int nfs_unlink(struct inode *, struct dentry *); 358 int nfs_symlink(struct inode *, struct dentry *, const char *); 359 int nfs_link(struct dentry *, struct inode *, struct dentry *); 360 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 361 int nfs_rename(struct inode *, struct dentry *, 362 struct inode *, struct dentry *, unsigned int); 363 364 /* file.c */ 365 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 366 loff_t nfs_file_llseek(struct file *, loff_t, int); 367 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 368 int nfs_file_mmap(struct file *, struct vm_area_struct *); 369 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 370 int nfs_file_release(struct inode *, struct file *); 371 int nfs_lock(struct file *, int, struct file_lock *); 372 int nfs_flock(struct file *, int, struct file_lock *); 373 int nfs_check_flags(int); 374 375 /* inode.c */ 376 extern struct workqueue_struct *nfsiod_workqueue; 377 extern struct inode *nfs_alloc_inode(struct super_block *sb); 378 extern void nfs_free_inode(struct inode *); 379 extern int nfs_write_inode(struct inode *, struct writeback_control *); 380 extern int nfs_drop_inode(struct inode *); 381 extern void nfs_clear_inode(struct inode *); 382 extern void nfs_evict_inode(struct inode *); 383 void nfs_zap_acl_cache(struct inode *inode); 384 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 385 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 386 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); 387 388 /* super.c */ 389 extern const struct super_operations nfs_sops; 390 extern struct file_system_type nfs_fs_type; 391 extern struct file_system_type nfs_xdev_fs_type; 392 #if IS_ENABLED(CONFIG_NFS_V4) 393 extern struct file_system_type nfs4_referral_fs_type; 394 #endif 395 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 396 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 397 struct nfs_subversion *); 398 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 399 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 400 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 401 struct nfs_mount_info *, struct nfs_subversion *); 402 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 403 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 404 const char *, struct nfs_mount_info *); 405 void nfs_kill_super(struct super_block *); 406 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 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); 414 415 /* io.c */ 416 extern void nfs_start_io_read(struct inode *inode); 417 extern void nfs_end_io_read(struct inode *inode); 418 extern void nfs_start_io_write(struct inode *inode); 419 extern void nfs_end_io_write(struct inode *inode); 420 extern void nfs_start_io_direct(struct inode *inode); 421 extern void nfs_end_io_direct(struct inode *inode); 422 423 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 424 { 425 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 426 } 427 428 /* namespace.c */ 429 #define NFS_PATH_CANONICAL 1 430 extern char *nfs_path(char **p, struct dentry *dentry, 431 char *buffer, ssize_t buflen, unsigned flags); 432 extern struct vfsmount *nfs_d_automount(struct path *path); 433 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 434 struct nfs_fh *, struct nfs_fattr *); 435 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 436 struct nfs_fattr *, rpc_authflavor_t); 437 438 /* getroot.c */ 439 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 440 const char *); 441 #if IS_ENABLED(CONFIG_NFS_V4) 442 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 443 const char *); 444 445 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 446 #endif 447 448 struct nfs_pgio_completion_ops; 449 /* read.c */ 450 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 451 struct inode *inode, bool force_mds, 452 const struct nfs_pgio_completion_ops *compl_ops); 453 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 454 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 455 456 /* super.c */ 457 void nfs_umount_begin(struct super_block *); 458 int nfs_statfs(struct dentry *, struct kstatfs *); 459 int nfs_show_options(struct seq_file *, struct dentry *); 460 int nfs_show_devname(struct seq_file *, struct dentry *); 461 int nfs_show_path(struct seq_file *, struct dentry *); 462 int nfs_show_stats(struct seq_file *, struct dentry *); 463 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 464 465 /* write.c */ 466 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 467 struct inode *inode, int ioflags, bool force_mds, 468 const struct nfs_pgio_completion_ops *compl_ops); 469 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 470 extern void nfs_commit_free(struct nfs_commit_data *p); 471 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 472 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 473 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 474 struct nfs_commit_data *data, 475 const struct nfs_rpc_ops *nfs_ops, 476 const struct rpc_call_ops *call_ops, 477 int how, int flags); 478 extern void nfs_init_commit(struct nfs_commit_data *data, 479 struct list_head *head, 480 struct pnfs_layout_segment *lseg, 481 struct nfs_commit_info *cinfo); 482 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 483 struct nfs_commit_info *cinfo, int max); 484 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 485 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 486 struct nfs_commit_info *cinfo); 487 void nfs_mark_request_commit(struct nfs_page *req, 488 struct pnfs_layout_segment *lseg, 489 struct nfs_commit_info *cinfo, 490 u32 ds_commit_idx); 491 int nfs_write_need_commit(struct nfs_pgio_header *); 492 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 493 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 494 int how, struct nfs_commit_info *cinfo); 495 void nfs_retry_commit(struct list_head *page_list, 496 struct pnfs_layout_segment *lseg, 497 struct nfs_commit_info *cinfo, 498 u32 ds_commit_idx); 499 void nfs_commitdata_release(struct nfs_commit_data *data); 500 void nfs_request_add_commit_list(struct nfs_page *req, 501 struct nfs_commit_info *cinfo); 502 void nfs_request_add_commit_list_locked(struct nfs_page *req, 503 struct list_head *dst, 504 struct nfs_commit_info *cinfo); 505 void nfs_request_remove_commit_list(struct nfs_page *req, 506 struct nfs_commit_info *cinfo); 507 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 508 struct inode *inode, 509 struct nfs_direct_req *dreq); 510 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 511 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 512 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 513 514 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 515 loff_t lstart, loff_t lend); 516 517 #ifdef CONFIG_NFS_V4_1 518 static inline 519 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 520 { 521 int i; 522 523 for (i = 0; i < cinfo->nbuckets; i++) 524 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 525 } 526 #else 527 static inline 528 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 529 { 530 } 531 #endif 532 533 #ifdef CONFIG_MIGRATION 534 extern int nfs_migrate_page(struct address_space *, 535 struct page *, struct page *, enum migrate_mode); 536 #endif 537 538 static inline int 539 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 540 const struct nfs_write_verifier *v2) 541 { 542 return memcmp(v1->data, v2->data, sizeof(v1->data)); 543 } 544 545 /* unlink.c */ 546 extern struct rpc_task * 547 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 548 struct dentry *old_dentry, struct dentry *new_dentry, 549 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 550 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 551 552 /* direct.c */ 553 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 554 struct nfs_direct_req *dreq); 555 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 556 557 /* nfs4proc.c */ 558 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 559 const struct nfs_client_initdata *); 560 extern int nfs40_walk_client_list(struct nfs_client *clp, 561 struct nfs_client **result, 562 const struct cred *cred); 563 extern int nfs41_walk_client_list(struct nfs_client *clp, 564 struct nfs_client **result, 565 const struct cred *cred); 566 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, 567 struct rpc_xprt *xprt, 568 void *data); 569 570 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 571 { 572 inode = igrab(inode); 573 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 574 iput(inode); 575 inode = NULL; 576 } 577 return inode; 578 } 579 580 static inline void nfs_iput_and_deactive(struct inode *inode) 581 { 582 if (inode != NULL) { 583 struct super_block *sb = inode->i_sb; 584 585 iput(inode); 586 nfs_sb_deactive(sb); 587 } 588 } 589 590 /* 591 * Determine the device name as a string 592 */ 593 static inline char *nfs_devname(struct dentry *dentry, 594 char *buffer, ssize_t buflen) 595 { 596 char *dummy; 597 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 598 } 599 600 /* 601 * Determine the actual block size (and log2 thereof) 602 */ 603 static inline 604 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 605 { 606 /* make sure blocksize is a power of two */ 607 if ((bsize & (bsize - 1)) || nrbitsp) { 608 unsigned char nrbits; 609 610 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 611 ; 612 bsize = 1 << nrbits; 613 if (nrbitsp) 614 *nrbitsp = nrbits; 615 } 616 617 return bsize; 618 } 619 620 /* 621 * Calculate the number of 512byte blocks used. 622 */ 623 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 624 { 625 blkcnt_t used = (tsize + 511) >> 9; 626 return (used > ULONG_MAX) ? ULONG_MAX : used; 627 } 628 629 /* 630 * Compute and set NFS server blocksize 631 */ 632 static inline 633 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 634 { 635 if (bsize < NFS_MIN_FILE_IO_SIZE) 636 bsize = NFS_DEF_FILE_IO_SIZE; 637 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 638 bsize = NFS_MAX_FILE_IO_SIZE; 639 640 return nfs_block_bits(bsize, nrbitsp); 641 } 642 643 /* 644 * Determine the maximum file size for a superblock 645 */ 646 static inline 647 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 648 { 649 sb->s_maxbytes = (loff_t)maxfilesize; 650 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 651 sb->s_maxbytes = MAX_LFS_FILESIZE; 652 } 653 654 /* 655 * Record the page as unstable and mark its inode as dirty. 656 */ 657 static inline 658 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) 659 { 660 if (!cinfo->dreq) { 661 struct inode *inode = page_file_mapping(page)->host; 662 663 inc_node_page_state(page, NR_UNSTABLE_NFS); 664 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE); 665 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 666 } 667 } 668 669 /* 670 * Determine the number of bytes of data the page contains 671 */ 672 static inline 673 unsigned int nfs_page_length(struct page *page) 674 { 675 loff_t i_size = i_size_read(page_file_mapping(page)->host); 676 677 if (i_size > 0) { 678 pgoff_t index = page_index(page); 679 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 680 if (index < end_index) 681 return PAGE_SIZE; 682 if (index == end_index) 683 return ((i_size - 1) & ~PAGE_MASK) + 1; 684 } 685 return 0; 686 } 687 688 /* 689 * Convert a umode to a dirent->d_type 690 */ 691 static inline 692 unsigned char nfs_umode_to_dtype(umode_t mode) 693 { 694 return (mode >> 12) & 15; 695 } 696 697 /* 698 * Determine the number of pages in an array of length 'len' and 699 * with a base offset of 'base' 700 */ 701 static inline 702 unsigned int nfs_page_array_len(unsigned int base, size_t len) 703 { 704 return ((unsigned long)len + (unsigned long)base + 705 PAGE_SIZE - 1) >> PAGE_SHIFT; 706 } 707 708 /* 709 * Convert a struct timespec into a 64-bit change attribute 710 * 711 * This does approximately the same thing as timespec_to_ns(), 712 * but for calculation efficiency, we multiply the seconds by 713 * 1024*1024*1024. 714 */ 715 static inline 716 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 717 { 718 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 719 } 720 721 #ifdef CONFIG_CRC32 722 /** 723 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 724 * @fh - pointer to filehandle 725 * 726 * returns a crc32 hash for the filehandle that is compatible with 727 * the one displayed by "wireshark". 728 */ 729 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 730 { 731 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 732 } 733 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 734 { 735 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 736 NFS4_STATEID_OTHER_SIZE); 737 } 738 #else 739 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 740 { 741 return 0; 742 } 743 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 744 { 745 return 0; 746 } 747 #endif 748 749 static inline bool nfs_error_is_fatal(int err) 750 { 751 switch (err) { 752 case -ERESTARTSYS: 753 case -EINTR: 754 case -EACCES: 755 case -EDQUOT: 756 case -EFBIG: 757 case -EIO: 758 case -ENOSPC: 759 case -EROFS: 760 case -ESTALE: 761 case -E2BIG: 762 case -ENOMEM: 763 case -ETIMEDOUT: 764 return true; 765 default: 766 return false; 767 } 768 } 769 770 static inline bool nfs_error_is_fatal_on_server(int err) 771 { 772 switch (err) { 773 case 0: 774 case -ERESTARTSYS: 775 case -EINTR: 776 return false; 777 } 778 return nfs_error_is_fatal(err); 779 } 780