1 /* 2 * NFS internal definitions 3 */ 4 5 #include "nfs4_fs.h" 6 #include <linux/mount.h> 7 #include <linux/security.h> 8 #include <linux/crc32.h> 9 #include <linux/nfs_page.h> 10 #include <linux/wait_bit.h> 11 12 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 13 14 struct nfs_string; 15 16 /* Maximum number of readahead requests 17 * FIXME: this should really be a sysctl so that users may tune it to suit 18 * their needs. People that do NFS over a slow network, might for 19 * instance want to reduce it to something closer to 1 for improved 20 * interactive response. 21 */ 22 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 23 24 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 25 { 26 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 27 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 28 } 29 30 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 31 { 32 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 33 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 34 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 35 return 0; 36 return 1; 37 } 38 39 struct nfs_clone_mount { 40 const struct super_block *sb; 41 const struct dentry *dentry; 42 struct nfs_fh *fh; 43 struct nfs_fattr *fattr; 44 char *hostname; 45 char *mnt_path; 46 struct sockaddr *addr; 47 size_t addrlen; 48 rpc_authflavor_t authflavor; 49 }; 50 51 /* 52 * Note: RFC 1813 doesn't limit the number of auth flavors that 53 * a server can return, so make something up. 54 */ 55 #define NFS_MAX_SECFLAVORS (12) 56 57 /* 58 * Value used if the user did not specify a port value. 59 */ 60 #define NFS_UNSPEC_PORT (-1) 61 62 #define NFS_UNSPEC_RETRANS (UINT_MAX) 63 #define NFS_UNSPEC_TIMEO (UINT_MAX) 64 65 /* 66 * Maximum number of pages that readdir can use for creating 67 * a vmapped array of pages. 68 */ 69 #define NFS_MAX_READDIR_PAGES 8 70 71 struct nfs_client_initdata { 72 unsigned long init_flags; 73 const char *hostname; /* Hostname of the server */ 74 const struct sockaddr *addr; /* Address of the server */ 75 const char *nodename; /* Hostname of the client */ 76 const char *ip_addr; /* IP address of the client */ 77 size_t addrlen; 78 struct nfs_subversion *nfs_mod; 79 int proto; 80 u32 minorversion; 81 struct net *net; 82 const struct rpc_timeout *timeparms; 83 }; 84 85 /* 86 * In-kernel mount arguments 87 */ 88 struct nfs_parsed_mount_data { 89 int flags; 90 unsigned int rsize, wsize; 91 unsigned int timeo, retrans; 92 unsigned int acregmin, acregmax, 93 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 bool need_mount; 104 105 struct { 106 struct sockaddr_storage address; 107 size_t addrlen; 108 char *hostname; 109 u32 version; 110 int port; 111 unsigned short protocol; 112 } mount_server; 113 114 struct { 115 struct sockaddr_storage address; 116 size_t addrlen; 117 char *hostname; 118 char *export_path; 119 int port; 120 unsigned short protocol; 121 } nfs_server; 122 123 struct security_mnt_opts lsm_opts; 124 struct net *net; 125 }; 126 127 /* mount_clnt.c */ 128 struct nfs_mount_request { 129 struct sockaddr *sap; 130 size_t salen; 131 char *hostname; 132 char *dirpath; 133 u32 version; 134 unsigned short protocol; 135 struct nfs_fh *fh; 136 int noresvport; 137 unsigned int *auth_flav_len; 138 rpc_authflavor_t *auth_flavs; 139 struct net *net; 140 }; 141 142 struct nfs_mount_info { 143 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 144 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 145 struct nfs_parsed_mount_data *parsed; 146 struct nfs_clone_mount *cloned; 147 struct nfs_fh *mntfh; 148 }; 149 150 extern int nfs_mount(struct nfs_mount_request *info); 151 extern void nfs_umount(const struct nfs_mount_request *info); 152 153 /* client.c */ 154 extern const struct rpc_program nfs_program; 155 extern void nfs_clients_init(struct net *net); 156 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 157 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 158 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 159 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 160 void nfs_server_insert_lists(struct nfs_server *); 161 void nfs_server_remove_lists(struct nfs_server *); 162 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 163 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 164 rpc_authflavor_t); 165 struct nfs_server *nfs_alloc_server(void); 166 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 167 168 extern void nfs_cleanup_cb_ident_idr(struct net *); 169 extern void nfs_put_client(struct nfs_client *); 170 extern void nfs_free_client(struct nfs_client *); 171 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 172 extern struct nfs_client * 173 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 174 struct nfs4_sessionid *, u32); 175 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 176 struct nfs_subversion *); 177 extern struct nfs_server *nfs4_create_server( 178 struct nfs_mount_info *, 179 struct nfs_subversion *); 180 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 181 struct nfs_fh *); 182 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 183 struct sockaddr *sap, size_t salen, 184 struct net *net); 185 extern void nfs_free_server(struct nfs_server *server); 186 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 187 struct nfs_fh *, 188 struct nfs_fattr *, 189 rpc_authflavor_t); 190 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 191 extern int nfs_client_init_status(const struct nfs_client *clp); 192 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 193 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 194 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 195 const struct sockaddr *ds_addr, 196 int ds_addrlen, int ds_proto, 197 unsigned int ds_timeo, 198 unsigned int ds_retrans, 199 u32 minor_version); 200 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 201 struct inode *); 202 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 203 const struct sockaddr *ds_addr, int ds_addrlen, 204 int ds_proto, unsigned int ds_timeo, 205 unsigned int ds_retrans); 206 #ifdef CONFIG_PROC_FS 207 extern int __init nfs_fs_proc_init(void); 208 extern void nfs_fs_proc_exit(void); 209 extern int nfs_fs_proc_net_init(struct net *net); 210 extern void nfs_fs_proc_net_exit(struct net *net); 211 #else 212 static inline int nfs_fs_proc_net_init(struct net *net) 213 { 214 return 0; 215 } 216 static inline void nfs_fs_proc_net_exit(struct net *net) 217 { 218 } 219 static inline int nfs_fs_proc_init(void) 220 { 221 return 0; 222 } 223 static inline void nfs_fs_proc_exit(void) 224 { 225 } 226 #endif 227 228 /* callback_xdr.c */ 229 extern const struct svc_version nfs4_callback_version1; 230 extern const struct svc_version nfs4_callback_version4; 231 232 struct nfs_pageio_descriptor; 233 /* pagelist.c */ 234 extern int __init nfs_init_nfspagecache(void); 235 extern void nfs_destroy_nfspagecache(void); 236 extern int __init nfs_init_readpagecache(void); 237 extern void nfs_destroy_readpagecache(void); 238 extern int __init nfs_init_writepagecache(void); 239 extern void nfs_destroy_writepagecache(void); 240 241 extern int __init nfs_init_directcache(void); 242 extern void nfs_destroy_directcache(void); 243 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 244 struct nfs_pgio_header *hdr, 245 void (*release)(struct nfs_pgio_header *hdr)); 246 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 247 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 248 249 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 250 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 251 void nfs_pgio_header_free(struct nfs_pgio_header *); 252 void nfs_pgio_data_destroy(struct nfs_pgio_header *); 253 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 254 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 255 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops, 256 const struct rpc_call_ops *call_ops, int how, int flags); 257 void nfs_free_request(struct nfs_page *req); 258 struct nfs_pgio_mirror * 259 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 260 261 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc) 262 { 263 WARN_ON_ONCE(desc->pg_mirror_count < 1); 264 return desc->pg_mirror_count > 1; 265 } 266 267 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 268 const struct nfs_open_context *ctx2) 269 { 270 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state; 271 } 272 273 /* nfs2xdr.c */ 274 extern const struct rpc_procinfo nfs_procedures[]; 275 extern int nfs2_decode_dirent(struct xdr_stream *, 276 struct nfs_entry *, int); 277 278 /* nfs3xdr.c */ 279 extern const struct rpc_procinfo nfs3_procedures[]; 280 extern int nfs3_decode_dirent(struct xdr_stream *, 281 struct nfs_entry *, int); 282 283 /* nfs4xdr.c */ 284 #if IS_ENABLED(CONFIG_NFS_V4) 285 extern int nfs4_decode_dirent(struct xdr_stream *, 286 struct nfs_entry *, int); 287 #endif 288 #ifdef CONFIG_NFS_V4_1 289 extern const u32 nfs41_maxread_overhead; 290 extern const u32 nfs41_maxwrite_overhead; 291 extern const u32 nfs41_maxgetdevinfo_overhead; 292 #endif 293 294 /* nfs4proc.c */ 295 #if IS_ENABLED(CONFIG_NFS_V4) 296 extern const struct rpc_procinfo nfs4_procedures[]; 297 #endif 298 299 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 300 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 301 static inline struct nfs4_label * 302 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 303 { 304 if (!dst || !src) 305 return NULL; 306 307 if (src->len > NFS4_MAXLABELLEN) 308 return NULL; 309 310 dst->lfs = src->lfs; 311 dst->pi = src->pi; 312 dst->len = src->len; 313 memcpy(dst->label, src->label, src->len); 314 315 return dst; 316 } 317 static inline void nfs4_label_free(struct nfs4_label *label) 318 { 319 if (label) { 320 kfree(label->label); 321 kfree(label); 322 } 323 return; 324 } 325 326 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 327 { 328 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 329 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 330 } 331 #else 332 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 333 static inline void nfs4_label_free(void *label) {} 334 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 335 { 336 } 337 static inline struct nfs4_label * 338 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 339 { 340 return NULL; 341 } 342 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 343 344 /* proc.c */ 345 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 346 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 347 const struct nfs_client_initdata *); 348 349 /* dir.c */ 350 extern void nfs_advise_use_readdirplus(struct inode *dir); 351 extern void nfs_force_use_readdirplus(struct inode *dir); 352 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 353 struct shrink_control *sc); 354 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 355 struct shrink_control *sc); 356 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 357 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 358 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 359 int nfs_rmdir(struct inode *, struct dentry *); 360 int nfs_unlink(struct inode *, struct dentry *); 361 int nfs_symlink(struct inode *, struct dentry *, const char *); 362 int nfs_link(struct dentry *, struct inode *, struct dentry *); 363 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 364 int nfs_rename(struct inode *, struct dentry *, 365 struct inode *, struct dentry *, unsigned int); 366 367 /* file.c */ 368 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 369 loff_t nfs_file_llseek(struct file *, loff_t, int); 370 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 371 int nfs_file_mmap(struct file *, struct vm_area_struct *); 372 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 373 int nfs_file_release(struct inode *, struct file *); 374 int nfs_lock(struct file *, int, struct file_lock *); 375 int nfs_flock(struct file *, int, struct file_lock *); 376 int nfs_check_flags(int); 377 378 /* inode.c */ 379 extern struct workqueue_struct *nfsiod_workqueue; 380 extern struct inode *nfs_alloc_inode(struct super_block *sb); 381 extern void nfs_destroy_inode(struct inode *); 382 extern int nfs_write_inode(struct inode *, struct writeback_control *); 383 extern int nfs_drop_inode(struct inode *); 384 extern void nfs_clear_inode(struct inode *); 385 extern void nfs_evict_inode(struct inode *); 386 void nfs_zap_acl_cache(struct inode *inode); 387 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 388 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 389 extern int nfs_wait_atomic_killable(atomic_t *p); 390 391 /* super.c */ 392 extern const struct super_operations nfs_sops; 393 extern struct file_system_type nfs_fs_type; 394 extern struct file_system_type nfs_xdev_fs_type; 395 #if IS_ENABLED(CONFIG_NFS_V4) 396 extern struct file_system_type nfs4_xdev_fs_type; 397 extern struct file_system_type nfs4_referral_fs_type; 398 #endif 399 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 400 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 401 struct nfs_subversion *); 402 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 403 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 404 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 405 struct nfs_mount_info *, struct nfs_subversion *); 406 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 407 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 408 const char *, struct nfs_mount_info *); 409 void nfs_kill_super(struct super_block *); 410 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 411 412 extern struct rpc_stat nfs_rpcstat; 413 414 extern int __init register_nfs_fs(void); 415 extern void __exit unregister_nfs_fs(void); 416 extern bool nfs_sb_active(struct super_block *sb); 417 extern void nfs_sb_deactive(struct super_block *sb); 418 419 /* io.c */ 420 extern void nfs_start_io_read(struct inode *inode); 421 extern void nfs_end_io_read(struct inode *inode); 422 extern void nfs_start_io_write(struct inode *inode); 423 extern void nfs_end_io_write(struct inode *inode); 424 extern void nfs_start_io_direct(struct inode *inode); 425 extern void nfs_end_io_direct(struct inode *inode); 426 427 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 428 { 429 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 430 } 431 432 /* namespace.c */ 433 #define NFS_PATH_CANONICAL 1 434 extern char *nfs_path(char **p, struct dentry *dentry, 435 char *buffer, ssize_t buflen, unsigned flags); 436 extern struct vfsmount *nfs_d_automount(struct path *path); 437 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 438 struct nfs_fh *, struct nfs_fattr *); 439 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 440 struct nfs_fattr *, rpc_authflavor_t); 441 442 /* getroot.c */ 443 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 444 const char *); 445 #if IS_ENABLED(CONFIG_NFS_V4) 446 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 447 const char *); 448 449 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 450 #endif 451 452 struct nfs_pgio_completion_ops; 453 /* read.c */ 454 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 455 struct inode *inode, bool force_mds, 456 const struct nfs_pgio_completion_ops *compl_ops); 457 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 458 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 459 460 /* super.c */ 461 void nfs_umount_begin(struct super_block *); 462 int nfs_statfs(struct dentry *, struct kstatfs *); 463 int nfs_show_options(struct seq_file *, struct dentry *); 464 int nfs_show_devname(struct seq_file *, struct dentry *); 465 int nfs_show_path(struct seq_file *, struct dentry *); 466 int nfs_show_stats(struct seq_file *, struct dentry *); 467 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 468 469 /* write.c */ 470 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 471 struct inode *inode, int ioflags, bool force_mds, 472 const struct nfs_pgio_completion_ops *compl_ops); 473 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 474 extern void nfs_commit_free(struct nfs_commit_data *p); 475 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 476 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 477 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 478 struct nfs_commit_data *data, 479 const struct nfs_rpc_ops *nfs_ops, 480 const struct rpc_call_ops *call_ops, 481 int how, int flags); 482 extern void nfs_init_commit(struct nfs_commit_data *data, 483 struct list_head *head, 484 struct pnfs_layout_segment *lseg, 485 struct nfs_commit_info *cinfo); 486 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 487 struct nfs_commit_info *cinfo, int max); 488 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 489 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 490 struct nfs_commit_info *cinfo); 491 void nfs_mark_request_commit(struct nfs_page *req, 492 struct pnfs_layout_segment *lseg, 493 struct nfs_commit_info *cinfo, 494 u32 ds_commit_idx); 495 int nfs_write_need_commit(struct nfs_pgio_header *); 496 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 497 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 498 int how, struct nfs_commit_info *cinfo); 499 void nfs_retry_commit(struct list_head *page_list, 500 struct pnfs_layout_segment *lseg, 501 struct nfs_commit_info *cinfo, 502 u32 ds_commit_idx); 503 void nfs_commitdata_release(struct nfs_commit_data *data); 504 void nfs_request_add_commit_list(struct nfs_page *req, 505 struct nfs_commit_info *cinfo); 506 void nfs_request_add_commit_list_locked(struct nfs_page *req, 507 struct list_head *dst, 508 struct nfs_commit_info *cinfo); 509 void nfs_request_remove_commit_list(struct nfs_page *req, 510 struct nfs_commit_info *cinfo); 511 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 512 struct inode *inode, 513 struct nfs_direct_req *dreq); 514 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 515 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 516 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 517 518 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 519 loff_t lstart, loff_t lend); 520 521 #ifdef CONFIG_NFS_V4_1 522 static inline 523 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 524 { 525 int i; 526 527 for (i = 0; i < cinfo->nbuckets; i++) 528 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 529 } 530 #else 531 static inline 532 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 533 { 534 } 535 #endif 536 537 #ifdef CONFIG_MIGRATION 538 extern int nfs_migrate_page(struct address_space *, 539 struct page *, struct page *, enum migrate_mode); 540 #endif 541 542 static inline int 543 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 544 const struct nfs_write_verifier *v2) 545 { 546 return memcmp(v1->data, v2->data, sizeof(v1->data)); 547 } 548 549 /* unlink.c */ 550 extern struct rpc_task * 551 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 552 struct dentry *old_dentry, struct dentry *new_dentry, 553 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 554 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 555 556 /* direct.c */ 557 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 558 struct nfs_direct_req *dreq); 559 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 560 561 /* nfs4proc.c */ 562 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 563 const struct nfs_client_initdata *); 564 extern int nfs40_walk_client_list(struct nfs_client *clp, 565 struct nfs_client **result, 566 struct rpc_cred *cred); 567 extern int nfs41_walk_client_list(struct nfs_client *clp, 568 struct nfs_client **result, 569 struct rpc_cred *cred); 570 extern int nfs4_test_session_trunk(struct rpc_clnt *, 571 struct rpc_xprt *, 572 void *); 573 574 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 575 { 576 inode = igrab(inode); 577 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 578 iput(inode); 579 inode = NULL; 580 } 581 return inode; 582 } 583 584 static inline void nfs_iput_and_deactive(struct inode *inode) 585 { 586 if (inode != NULL) { 587 struct super_block *sb = inode->i_sb; 588 589 iput(inode); 590 nfs_sb_deactive(sb); 591 } 592 } 593 594 /* 595 * Determine the device name as a string 596 */ 597 static inline char *nfs_devname(struct dentry *dentry, 598 char *buffer, ssize_t buflen) 599 { 600 char *dummy; 601 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 602 } 603 604 /* 605 * Determine the actual block size (and log2 thereof) 606 */ 607 static inline 608 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 609 { 610 /* make sure blocksize is a power of two */ 611 if ((bsize & (bsize - 1)) || nrbitsp) { 612 unsigned char nrbits; 613 614 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 615 ; 616 bsize = 1 << nrbits; 617 if (nrbitsp) 618 *nrbitsp = nrbits; 619 } 620 621 return bsize; 622 } 623 624 /* 625 * Calculate the number of 512byte blocks used. 626 */ 627 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 628 { 629 blkcnt_t used = (tsize + 511) >> 9; 630 return (used > ULONG_MAX) ? ULONG_MAX : used; 631 } 632 633 /* 634 * Compute and set NFS server blocksize 635 */ 636 static inline 637 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 638 { 639 if (bsize < NFS_MIN_FILE_IO_SIZE) 640 bsize = NFS_DEF_FILE_IO_SIZE; 641 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 642 bsize = NFS_MAX_FILE_IO_SIZE; 643 644 return nfs_block_bits(bsize, nrbitsp); 645 } 646 647 /* 648 * Determine the maximum file size for a superblock 649 */ 650 static inline 651 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 652 { 653 sb->s_maxbytes = (loff_t)maxfilesize; 654 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 655 sb->s_maxbytes = MAX_LFS_FILESIZE; 656 } 657 658 /* 659 * Record the page as unstable and mark its inode as dirty. 660 */ 661 static inline 662 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) 663 { 664 if (!cinfo->dreq) { 665 struct inode *inode = page_file_mapping(page)->host; 666 667 inc_node_page_state(page, NR_UNSTABLE_NFS); 668 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE); 669 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 670 } 671 } 672 673 /* 674 * Determine the number of bytes of data the page contains 675 */ 676 static inline 677 unsigned int nfs_page_length(struct page *page) 678 { 679 loff_t i_size = i_size_read(page_file_mapping(page)->host); 680 681 if (i_size > 0) { 682 pgoff_t index = page_index(page); 683 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 684 if (index < end_index) 685 return PAGE_SIZE; 686 if (index == end_index) 687 return ((i_size - 1) & ~PAGE_MASK) + 1; 688 } 689 return 0; 690 } 691 692 /* 693 * Convert a umode to a dirent->d_type 694 */ 695 static inline 696 unsigned char nfs_umode_to_dtype(umode_t mode) 697 { 698 return (mode >> 12) & 15; 699 } 700 701 /* 702 * Determine the number of pages in an array of length 'len' and 703 * with a base offset of 'base' 704 */ 705 static inline 706 unsigned int nfs_page_array_len(unsigned int base, size_t len) 707 { 708 return ((unsigned long)len + (unsigned long)base + 709 PAGE_SIZE - 1) >> PAGE_SHIFT; 710 } 711 712 /* 713 * Convert a struct timespec into a 64-bit change attribute 714 * 715 * This does approximately the same thing as timespec_to_ns(), 716 * but for calculation efficiency, we multiply the seconds by 717 * 1024*1024*1024. 718 */ 719 static inline 720 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 721 { 722 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 723 } 724 725 #ifdef CONFIG_CRC32 726 /** 727 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 728 * @fh - pointer to filehandle 729 * 730 * returns a crc32 hash for the filehandle that is compatible with 731 * the one displayed by "wireshark". 732 */ 733 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 734 { 735 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 736 } 737 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 738 { 739 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 740 NFS4_STATEID_OTHER_SIZE); 741 } 742 #else 743 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 744 { 745 return 0; 746 } 747 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 748 { 749 return 0; 750 } 751 #endif 752 753 static inline bool nfs_error_is_fatal(int err) 754 { 755 switch (err) { 756 case -ERESTARTSYS: 757 case -EACCES: 758 case -EDQUOT: 759 case -EFBIG: 760 case -EIO: 761 case -ENOSPC: 762 case -EROFS: 763 case -ESTALE: 764 case -E2BIG: 765 return true; 766 default: 767 return false; 768 } 769 } 770