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 11 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 12 13 struct nfs_string; 14 15 /* Maximum number of readahead requests 16 * FIXME: this should really be a sysctl so that users may tune it to suit 17 * their needs. People that do NFS over a slow network, might for 18 * instance want to reduce it to something closer to 1 for improved 19 * interactive response. 20 */ 21 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 22 23 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 24 { 25 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 26 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 27 } 28 29 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 30 { 31 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 32 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 33 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 34 return 0; 35 return 1; 36 } 37 38 struct nfs_clone_mount { 39 const struct super_block *sb; 40 const struct dentry *dentry; 41 struct nfs_fh *fh; 42 struct nfs_fattr *fattr; 43 char *hostname; 44 char *mnt_path; 45 struct sockaddr *addr; 46 size_t addrlen; 47 rpc_authflavor_t authflavor; 48 }; 49 50 /* 51 * Note: RFC 1813 doesn't limit the number of auth flavors that 52 * a server can return, so make something up. 53 */ 54 #define NFS_MAX_SECFLAVORS (12) 55 56 /* 57 * Value used if the user did not specify a port value. 58 */ 59 #define NFS_UNSPEC_PORT (-1) 60 61 #define NFS_UNSPEC_RETRANS (UINT_MAX) 62 #define NFS_UNSPEC_TIMEO (UINT_MAX) 63 64 /* 65 * Maximum number of pages that readdir can use for creating 66 * a vmapped array of pages. 67 */ 68 #define NFS_MAX_READDIR_PAGES 8 69 70 struct nfs_client_initdata { 71 unsigned long init_flags; 72 const char *hostname; /* Hostname of the server */ 73 const struct sockaddr *addr; /* Address of the server */ 74 const char *nodename; /* Hostname of the client */ 75 const char *ip_addr; /* IP address of the client */ 76 size_t addrlen; 77 struct nfs_subversion *nfs_mod; 78 int proto; 79 u32 minorversion; 80 struct net *net; 81 const struct rpc_timeout *timeparms; 82 }; 83 84 /* 85 * In-kernel mount arguments 86 */ 87 struct nfs_parsed_mount_data { 88 int flags; 89 unsigned int rsize, wsize; 90 unsigned int timeo, retrans; 91 unsigned int acregmin, acregmax, 92 acdirmin, acdirmax; 93 unsigned int namlen; 94 unsigned int options; 95 unsigned int bsize; 96 struct nfs_auth_info auth_info; 97 rpc_authflavor_t selected_flavor; 98 char *client_address; 99 unsigned int version; 100 unsigned int minorversion; 101 char *fscache_uniq; 102 bool need_mount; 103 104 struct { 105 struct sockaddr_storage address; 106 size_t addrlen; 107 char *hostname; 108 u32 version; 109 int port; 110 unsigned short protocol; 111 } mount_server; 112 113 struct { 114 struct sockaddr_storage address; 115 size_t addrlen; 116 char *hostname; 117 char *export_path; 118 int port; 119 unsigned short protocol; 120 } nfs_server; 121 122 struct security_mnt_opts lsm_opts; 123 struct net *net; 124 }; 125 126 /* mount_clnt.c */ 127 struct nfs_mount_request { 128 struct sockaddr *sap; 129 size_t salen; 130 char *hostname; 131 char *dirpath; 132 u32 version; 133 unsigned short protocol; 134 struct nfs_fh *fh; 135 int noresvport; 136 unsigned int *auth_flav_len; 137 rpc_authflavor_t *auth_flavs; 138 struct net *net; 139 }; 140 141 struct nfs_mount_info { 142 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 143 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 144 struct nfs_parsed_mount_data *parsed; 145 struct nfs_clone_mount *cloned; 146 struct nfs_fh *mntfh; 147 }; 148 149 extern int nfs_mount(struct nfs_mount_request *info); 150 extern void nfs_umount(const struct nfs_mount_request *info); 151 152 /* client.c */ 153 extern const struct rpc_program nfs_program; 154 extern void nfs_clients_init(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_cleanup_cb_ident_idr(struct net *); 168 extern void nfs_put_client(struct nfs_client *); 169 extern void nfs_free_client(struct nfs_client *); 170 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 171 extern struct nfs_client * 172 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 173 struct nfs4_sessionid *, u32); 174 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 175 struct nfs_subversion *); 176 extern struct nfs_server *nfs4_create_server( 177 struct nfs_mount_info *, 178 struct nfs_subversion *); 179 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 180 struct nfs_fh *); 181 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 182 struct sockaddr *sap, size_t salen, 183 struct net *net); 184 extern void nfs_free_server(struct nfs_server *server); 185 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 186 struct nfs_fh *, 187 struct nfs_fattr *, 188 rpc_authflavor_t); 189 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 190 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 191 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 192 const struct sockaddr *ds_addr, 193 int ds_addrlen, int ds_proto, 194 unsigned int ds_timeo, 195 unsigned int ds_retrans, 196 u32 minor_version); 197 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 198 struct inode *); 199 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 200 const struct sockaddr *ds_addr, int ds_addrlen, 201 int ds_proto, unsigned int ds_timeo, 202 unsigned int ds_retrans); 203 #ifdef CONFIG_PROC_FS 204 extern int __init nfs_fs_proc_init(void); 205 extern void nfs_fs_proc_exit(void); 206 extern int nfs_fs_proc_net_init(struct net *net); 207 extern void nfs_fs_proc_net_exit(struct net *net); 208 #else 209 static inline int nfs_fs_proc_net_init(struct net *net) 210 { 211 return 0; 212 } 213 static inline void nfs_fs_proc_net_exit(struct net *net) 214 { 215 } 216 static inline int nfs_fs_proc_init(void) 217 { 218 return 0; 219 } 220 static inline void nfs_fs_proc_exit(void) 221 { 222 } 223 #endif 224 225 /* callback_xdr.c */ 226 extern struct svc_version nfs4_callback_version1; 227 extern struct svc_version nfs4_callback_version4; 228 229 struct nfs_pageio_descriptor; 230 /* pagelist.c */ 231 extern int __init nfs_init_nfspagecache(void); 232 extern void nfs_destroy_nfspagecache(void); 233 extern int __init nfs_init_readpagecache(void); 234 extern void nfs_destroy_readpagecache(void); 235 extern int __init nfs_init_writepagecache(void); 236 extern void nfs_destroy_writepagecache(void); 237 238 extern int __init nfs_init_directcache(void); 239 extern void nfs_destroy_directcache(void); 240 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 241 struct nfs_pgio_header *hdr, 242 void (*release)(struct nfs_pgio_header *hdr)); 243 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 244 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 245 246 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 247 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 248 void nfs_pgio_header_free(struct nfs_pgio_header *); 249 void nfs_pgio_data_destroy(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 struct rpc_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 ctx1->cred == ctx2->cred && ctx1->state == ctx2->state; 268 } 269 270 /* nfs2xdr.c */ 271 extern struct rpc_procinfo nfs_procedures[]; 272 extern int nfs2_decode_dirent(struct xdr_stream *, 273 struct nfs_entry *, int); 274 275 /* nfs3xdr.c */ 276 extern struct rpc_procinfo nfs3_procedures[]; 277 extern int nfs3_decode_dirent(struct xdr_stream *, 278 struct nfs_entry *, int); 279 280 /* nfs4xdr.c */ 281 #if IS_ENABLED(CONFIG_NFS_V4) 282 extern int nfs4_decode_dirent(struct xdr_stream *, 283 struct nfs_entry *, int); 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 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_destroy_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); 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_xdev_fs_type; 394 extern struct file_system_type nfs4_referral_fs_type; 395 #endif 396 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 397 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 398 struct nfs_subversion *); 399 void nfs_initialise_sb(struct super_block *); 400 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 401 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 402 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 403 struct nfs_mount_info *, struct nfs_subversion *); 404 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 405 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 406 const char *, struct nfs_mount_info *); 407 void nfs_kill_super(struct super_block *); 408 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 409 410 extern struct rpc_stat nfs_rpcstat; 411 412 extern int __init register_nfs_fs(void); 413 extern void __exit unregister_nfs_fs(void); 414 extern bool nfs_sb_active(struct super_block *sb); 415 extern void nfs_sb_deactive(struct super_block *sb); 416 417 /* 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 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 436 struct nfs_fh *, struct nfs_fattr *); 437 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 438 struct nfs_fattr *, rpc_authflavor_t); 439 440 /* getroot.c */ 441 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 442 const char *); 443 #if IS_ENABLED(CONFIG_NFS_V4) 444 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 445 const char *); 446 447 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 448 #endif 449 450 struct nfs_pgio_completion_ops; 451 /* read.c */ 452 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 453 struct inode *inode, bool force_mds, 454 const struct nfs_pgio_completion_ops *compl_ops); 455 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 456 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 457 458 /* super.c */ 459 void nfs_clone_super(struct super_block *, struct nfs_mount_info *); 460 void nfs_umount_begin(struct super_block *); 461 int nfs_statfs(struct dentry *, struct kstatfs *); 462 int nfs_show_options(struct seq_file *, struct dentry *); 463 int nfs_show_devname(struct seq_file *, struct dentry *); 464 int nfs_show_path(struct seq_file *, struct dentry *); 465 int nfs_show_stats(struct seq_file *, struct dentry *); 466 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 467 468 /* write.c */ 469 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 470 struct inode *inode, int ioflags, bool force_mds, 471 const struct nfs_pgio_completion_ops *compl_ops); 472 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 473 extern void nfs_commit_free(struct nfs_commit_data *p); 474 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 475 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 476 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 477 struct nfs_commit_data *data, 478 const struct nfs_rpc_ops *nfs_ops, 479 const struct rpc_call_ops *call_ops, 480 int how, int flags); 481 extern void nfs_init_commit(struct nfs_commit_data *data, 482 struct list_head *head, 483 struct pnfs_layout_segment *lseg, 484 struct nfs_commit_info *cinfo); 485 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 486 struct nfs_commit_info *cinfo, int max); 487 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 488 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 489 struct nfs_commit_info *cinfo); 490 void nfs_mark_request_commit(struct nfs_page *req, 491 struct pnfs_layout_segment *lseg, 492 struct nfs_commit_info *cinfo, 493 u32 ds_commit_idx); 494 int nfs_write_need_commit(struct nfs_pgio_header *); 495 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 496 int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf); 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 -EIO: 758 case -ENOSPC: 759 case -EROFS: 760 case -E2BIG: 761 return true; 762 default: 763 return false; 764 } 765 } 766