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 extern const struct export_operations nfs_export_ops; 15 16 struct nfs_string; 17 18 /* Maximum number of readahead requests 19 * FIXME: this should really be a sysctl so that users may tune it to suit 20 * their needs. People that do NFS over a slow network, might for 21 * instance want to reduce it to something closer to 1 for improved 22 * interactive response. 23 */ 24 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 25 26 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 27 { 28 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 29 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 30 } 31 32 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 33 { 34 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 35 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 36 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 37 return 0; 38 return 1; 39 } 40 41 struct nfs_clone_mount { 42 const struct super_block *sb; 43 const struct dentry *dentry; 44 struct nfs_fh *fh; 45 struct nfs_fattr *fattr; 46 char *hostname; 47 char *mnt_path; 48 struct sockaddr *addr; 49 size_t addrlen; 50 rpc_authflavor_t authflavor; 51 }; 52 53 /* 54 * Note: RFC 1813 doesn't limit the number of auth flavors that 55 * a server can return, so make something up. 56 */ 57 #define NFS_MAX_SECFLAVORS (12) 58 59 /* 60 * Value used if the user did not specify a port value. 61 */ 62 #define NFS_UNSPEC_PORT (-1) 63 64 #define NFS_UNSPEC_RETRANS (UINT_MAX) 65 #define NFS_UNSPEC_TIMEO (UINT_MAX) 66 67 /* 68 * Maximum number of pages that readdir can use for creating 69 * a vmapped array of pages. 70 */ 71 #define NFS_MAX_READDIR_PAGES 8 72 73 struct nfs_client_initdata { 74 unsigned long init_flags; 75 const char *hostname; /* Hostname of the server */ 76 const struct sockaddr *addr; /* Address of the server */ 77 const char *nodename; /* Hostname of the client */ 78 const char *ip_addr; /* IP address of the client */ 79 size_t addrlen; 80 struct nfs_subversion *nfs_mod; 81 int proto; 82 u32 minorversion; 83 struct net *net; 84 const struct rpc_timeout *timeparms; 85 }; 86 87 /* 88 * In-kernel mount arguments 89 */ 90 struct nfs_parsed_mount_data { 91 int flags; 92 unsigned int rsize, wsize; 93 unsigned int timeo, retrans; 94 unsigned int acregmin, acregmax, 95 acdirmin, acdirmax; 96 unsigned int namlen; 97 unsigned int options; 98 unsigned int bsize; 99 struct nfs_auth_info auth_info; 100 rpc_authflavor_t selected_flavor; 101 char *client_address; 102 unsigned int version; 103 unsigned int minorversion; 104 char *fscache_uniq; 105 bool need_mount; 106 107 struct { 108 struct sockaddr_storage address; 109 size_t addrlen; 110 char *hostname; 111 u32 version; 112 int port; 113 unsigned short protocol; 114 } mount_server; 115 116 struct { 117 struct sockaddr_storage address; 118 size_t addrlen; 119 char *hostname; 120 char *export_path; 121 int port; 122 unsigned short protocol; 123 } nfs_server; 124 125 struct security_mnt_opts lsm_opts; 126 struct net *net; 127 }; 128 129 /* mount_clnt.c */ 130 struct nfs_mount_request { 131 struct sockaddr *sap; 132 size_t salen; 133 char *hostname; 134 char *dirpath; 135 u32 version; 136 unsigned short protocol; 137 struct nfs_fh *fh; 138 int noresvport; 139 unsigned int *auth_flav_len; 140 rpc_authflavor_t *auth_flavs; 141 struct net *net; 142 }; 143 144 struct nfs_mount_info { 145 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 146 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 147 struct nfs_parsed_mount_data *parsed; 148 struct nfs_clone_mount *cloned; 149 struct nfs_fh *mntfh; 150 }; 151 152 extern int nfs_mount(struct nfs_mount_request *info); 153 extern void nfs_umount(const struct nfs_mount_request *info); 154 155 /* client.c */ 156 extern const struct rpc_program nfs_program; 157 extern void nfs_clients_init(struct net *net); 158 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 159 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 160 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 161 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 162 void nfs_server_insert_lists(struct nfs_server *); 163 void nfs_server_remove_lists(struct nfs_server *); 164 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 165 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 166 rpc_authflavor_t); 167 struct nfs_server *nfs_alloc_server(void); 168 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 169 170 extern void nfs_cleanup_cb_ident_idr(struct net *); 171 extern void nfs_put_client(struct nfs_client *); 172 extern void nfs_free_client(struct nfs_client *); 173 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 174 extern struct nfs_client * 175 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 176 struct nfs4_sessionid *, u32); 177 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 178 struct nfs_subversion *); 179 extern struct nfs_server *nfs4_create_server( 180 struct nfs_mount_info *, 181 struct nfs_subversion *); 182 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 183 struct nfs_fh *); 184 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 185 struct sockaddr *sap, size_t salen, 186 struct net *net); 187 extern void nfs_free_server(struct nfs_server *server); 188 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 189 struct nfs_fh *, 190 struct nfs_fattr *, 191 rpc_authflavor_t); 192 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 193 extern int nfs_client_init_status(const struct nfs_client *clp); 194 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 195 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 196 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 197 const struct sockaddr *ds_addr, 198 int ds_addrlen, int ds_proto, 199 unsigned int ds_timeo, 200 unsigned int ds_retrans, 201 u32 minor_version); 202 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 203 struct inode *); 204 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 205 const struct sockaddr *ds_addr, int ds_addrlen, 206 int ds_proto, unsigned int ds_timeo, 207 unsigned int ds_retrans); 208 #ifdef CONFIG_PROC_FS 209 extern int __init nfs_fs_proc_init(void); 210 extern void nfs_fs_proc_exit(void); 211 extern int nfs_fs_proc_net_init(struct net *net); 212 extern void nfs_fs_proc_net_exit(struct net *net); 213 #else 214 static inline int nfs_fs_proc_net_init(struct net *net) 215 { 216 return 0; 217 } 218 static inline void nfs_fs_proc_net_exit(struct net *net) 219 { 220 } 221 static inline int nfs_fs_proc_init(void) 222 { 223 return 0; 224 } 225 static inline void nfs_fs_proc_exit(void) 226 { 227 } 228 #endif 229 230 /* callback_xdr.c */ 231 extern const struct svc_version nfs4_callback_version1; 232 extern const struct svc_version nfs4_callback_version4; 233 234 struct nfs_pageio_descriptor; 235 /* pagelist.c */ 236 extern int __init nfs_init_nfspagecache(void); 237 extern void nfs_destroy_nfspagecache(void); 238 extern int __init nfs_init_readpagecache(void); 239 extern void nfs_destroy_readpagecache(void); 240 extern int __init nfs_init_writepagecache(void); 241 extern void nfs_destroy_writepagecache(void); 242 243 extern int __init nfs_init_directcache(void); 244 extern void nfs_destroy_directcache(void); 245 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 246 struct nfs_pgio_header *hdr, 247 void (*release)(struct nfs_pgio_header *hdr)); 248 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 249 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 250 251 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 252 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 253 void nfs_pgio_header_free(struct nfs_pgio_header *); 254 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 255 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 256 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops, 257 const struct rpc_call_ops *call_ops, int how, int flags); 258 void nfs_free_request(struct nfs_page *req); 259 struct nfs_pgio_mirror * 260 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 261 262 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc) 263 { 264 WARN_ON_ONCE(desc->pg_mirror_count < 1); 265 return desc->pg_mirror_count > 1; 266 } 267 268 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 269 const struct nfs_open_context *ctx2) 270 { 271 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state; 272 } 273 274 /* nfs2xdr.c */ 275 extern const struct rpc_procinfo nfs_procedures[]; 276 extern int nfs2_decode_dirent(struct xdr_stream *, 277 struct nfs_entry *, bool); 278 279 /* nfs3xdr.c */ 280 extern const struct rpc_procinfo nfs3_procedures[]; 281 extern int nfs3_decode_dirent(struct xdr_stream *, 282 struct nfs_entry *, bool); 283 284 /* nfs4xdr.c */ 285 #if IS_ENABLED(CONFIG_NFS_V4) 286 extern int nfs4_decode_dirent(struct xdr_stream *, 287 struct nfs_entry *, bool); 288 #endif 289 #ifdef CONFIG_NFS_V4_1 290 extern const u32 nfs41_maxread_overhead; 291 extern const u32 nfs41_maxwrite_overhead; 292 extern const u32 nfs41_maxgetdevinfo_overhead; 293 #endif 294 295 /* nfs4proc.c */ 296 #if IS_ENABLED(CONFIG_NFS_V4) 297 extern const struct rpc_procinfo nfs4_procedures[]; 298 #endif 299 300 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 301 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 302 static inline struct nfs4_label * 303 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 304 { 305 if (!dst || !src) 306 return NULL; 307 308 if (src->len > NFS4_MAXLABELLEN) 309 return NULL; 310 311 dst->lfs = src->lfs; 312 dst->pi = src->pi; 313 dst->len = src->len; 314 memcpy(dst->label, src->label, src->len); 315 316 return dst; 317 } 318 static inline void nfs4_label_free(struct nfs4_label *label) 319 { 320 if (label) { 321 kfree(label->label); 322 kfree(label); 323 } 324 return; 325 } 326 327 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 328 { 329 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 330 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 331 } 332 #else 333 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 334 static inline void nfs4_label_free(void *label) {} 335 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 336 { 337 } 338 static inline struct nfs4_label * 339 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 340 { 341 return NULL; 342 } 343 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 344 345 /* proc.c */ 346 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 347 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 348 const struct nfs_client_initdata *); 349 350 /* dir.c */ 351 extern void nfs_advise_use_readdirplus(struct inode *dir); 352 extern void nfs_force_use_readdirplus(struct inode *dir); 353 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 354 struct shrink_control *sc); 355 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 356 struct shrink_control *sc); 357 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 358 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 359 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 360 int nfs_rmdir(struct inode *, struct dentry *); 361 int nfs_unlink(struct inode *, struct dentry *); 362 int nfs_symlink(struct inode *, struct dentry *, const char *); 363 int nfs_link(struct dentry *, struct inode *, struct dentry *); 364 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 365 int nfs_rename(struct inode *, struct dentry *, 366 struct inode *, struct dentry *, unsigned int); 367 368 /* file.c */ 369 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 370 loff_t nfs_file_llseek(struct file *, loff_t, int); 371 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 372 int nfs_file_mmap(struct file *, struct vm_area_struct *); 373 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 374 int nfs_file_release(struct inode *, struct file *); 375 int nfs_lock(struct file *, int, struct file_lock *); 376 int nfs_flock(struct file *, int, struct file_lock *); 377 int nfs_check_flags(int); 378 379 /* inode.c */ 380 extern struct workqueue_struct *nfsiod_workqueue; 381 extern struct inode *nfs_alloc_inode(struct super_block *sb); 382 extern void nfs_destroy_inode(struct inode *); 383 extern int nfs_write_inode(struct inode *, struct writeback_control *); 384 extern int nfs_drop_inode(struct inode *); 385 extern void nfs_clear_inode(struct inode *); 386 extern void nfs_evict_inode(struct inode *); 387 void nfs_zap_acl_cache(struct inode *inode); 388 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 389 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 390 extern int nfs_wait_atomic_killable(atomic_t *p); 391 392 /* super.c */ 393 extern const struct super_operations nfs_sops; 394 extern struct file_system_type nfs_fs_type; 395 extern struct file_system_type nfs_xdev_fs_type; 396 #if IS_ENABLED(CONFIG_NFS_V4) 397 extern struct file_system_type nfs4_xdev_fs_type; 398 extern struct file_system_type nfs4_referral_fs_type; 399 #endif 400 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 401 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 402 struct nfs_subversion *); 403 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 404 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 405 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 406 struct nfs_mount_info *, struct nfs_subversion *); 407 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 408 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 409 const char *, struct nfs_mount_info *); 410 void nfs_kill_super(struct super_block *); 411 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 412 413 extern struct rpc_stat nfs_rpcstat; 414 415 extern int __init register_nfs_fs(void); 416 extern void __exit unregister_nfs_fs(void); 417 extern bool nfs_sb_active(struct super_block *sb); 418 extern void nfs_sb_deactive(struct super_block *sb); 419 420 /* io.c */ 421 extern void nfs_start_io_read(struct inode *inode); 422 extern void nfs_end_io_read(struct inode *inode); 423 extern void nfs_start_io_write(struct inode *inode); 424 extern void nfs_end_io_write(struct inode *inode); 425 extern void nfs_start_io_direct(struct inode *inode); 426 extern void nfs_end_io_direct(struct inode *inode); 427 428 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 429 { 430 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 431 } 432 433 /* namespace.c */ 434 #define NFS_PATH_CANONICAL 1 435 extern char *nfs_path(char **p, struct dentry *dentry, 436 char *buffer, ssize_t buflen, unsigned flags); 437 extern struct vfsmount *nfs_d_automount(struct path *path); 438 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 439 struct nfs_fh *, struct nfs_fattr *); 440 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 441 struct nfs_fattr *, rpc_authflavor_t); 442 443 /* getroot.c */ 444 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 445 const char *); 446 #if IS_ENABLED(CONFIG_NFS_V4) 447 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 448 const char *); 449 450 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 451 #endif 452 453 struct nfs_pgio_completion_ops; 454 /* read.c */ 455 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 456 struct inode *inode, bool force_mds, 457 const struct nfs_pgio_completion_ops *compl_ops); 458 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 459 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 460 461 /* super.c */ 462 void nfs_umount_begin(struct super_block *); 463 int nfs_statfs(struct dentry *, struct kstatfs *); 464 int nfs_show_options(struct seq_file *, struct dentry *); 465 int nfs_show_devname(struct seq_file *, struct dentry *); 466 int nfs_show_path(struct seq_file *, struct dentry *); 467 int nfs_show_stats(struct seq_file *, struct dentry *); 468 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 469 470 /* write.c */ 471 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 472 struct inode *inode, int ioflags, bool force_mds, 473 const struct nfs_pgio_completion_ops *compl_ops); 474 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 475 extern void nfs_commit_free(struct nfs_commit_data *p); 476 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 477 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 478 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 479 struct nfs_commit_data *data, 480 const struct nfs_rpc_ops *nfs_ops, 481 const struct rpc_call_ops *call_ops, 482 int how, int flags); 483 extern void nfs_init_commit(struct nfs_commit_data *data, 484 struct list_head *head, 485 struct pnfs_layout_segment *lseg, 486 struct nfs_commit_info *cinfo); 487 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 488 struct nfs_commit_info *cinfo, int max); 489 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 490 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 491 struct nfs_commit_info *cinfo); 492 void nfs_mark_request_commit(struct nfs_page *req, 493 struct pnfs_layout_segment *lseg, 494 struct nfs_commit_info *cinfo, 495 u32 ds_commit_idx); 496 int nfs_write_need_commit(struct nfs_pgio_header *); 497 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 498 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 499 int how, struct nfs_commit_info *cinfo); 500 void nfs_retry_commit(struct list_head *page_list, 501 struct pnfs_layout_segment *lseg, 502 struct nfs_commit_info *cinfo, 503 u32 ds_commit_idx); 504 void nfs_commitdata_release(struct nfs_commit_data *data); 505 void nfs_request_add_commit_list(struct nfs_page *req, 506 struct nfs_commit_info *cinfo); 507 void nfs_request_add_commit_list_locked(struct nfs_page *req, 508 struct list_head *dst, 509 struct nfs_commit_info *cinfo); 510 void nfs_request_remove_commit_list(struct nfs_page *req, 511 struct nfs_commit_info *cinfo); 512 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 513 struct inode *inode, 514 struct nfs_direct_req *dreq); 515 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 516 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 517 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 518 519 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 520 loff_t lstart, loff_t lend); 521 522 #ifdef CONFIG_NFS_V4_1 523 static inline 524 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 525 { 526 int i; 527 528 for (i = 0; i < cinfo->nbuckets; i++) 529 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 530 } 531 #else 532 static inline 533 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 534 { 535 } 536 #endif 537 538 #ifdef CONFIG_MIGRATION 539 extern int nfs_migrate_page(struct address_space *, 540 struct page *, struct page *, enum migrate_mode); 541 #endif 542 543 static inline int 544 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 545 const struct nfs_write_verifier *v2) 546 { 547 return memcmp(v1->data, v2->data, sizeof(v1->data)); 548 } 549 550 /* unlink.c */ 551 extern struct rpc_task * 552 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 553 struct dentry *old_dentry, struct dentry *new_dentry, 554 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 555 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 556 557 /* direct.c */ 558 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 559 struct nfs_direct_req *dreq); 560 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 561 562 /* nfs4proc.c */ 563 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 564 const struct nfs_client_initdata *); 565 extern int nfs40_walk_client_list(struct nfs_client *clp, 566 struct nfs_client **result, 567 struct rpc_cred *cred); 568 extern int nfs41_walk_client_list(struct nfs_client *clp, 569 struct nfs_client **result, 570 struct rpc_cred *cred); 571 extern int nfs4_test_session_trunk(struct rpc_clnt *, 572 struct rpc_xprt *, 573 void *); 574 575 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 576 { 577 inode = igrab(inode); 578 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 579 iput(inode); 580 inode = NULL; 581 } 582 return inode; 583 } 584 585 static inline void nfs_iput_and_deactive(struct inode *inode) 586 { 587 if (inode != NULL) { 588 struct super_block *sb = inode->i_sb; 589 590 iput(inode); 591 nfs_sb_deactive(sb); 592 } 593 } 594 595 /* 596 * Determine the device name as a string 597 */ 598 static inline char *nfs_devname(struct dentry *dentry, 599 char *buffer, ssize_t buflen) 600 { 601 char *dummy; 602 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 603 } 604 605 /* 606 * Determine the actual block size (and log2 thereof) 607 */ 608 static inline 609 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 610 { 611 /* make sure blocksize is a power of two */ 612 if ((bsize & (bsize - 1)) || nrbitsp) { 613 unsigned char nrbits; 614 615 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 616 ; 617 bsize = 1 << nrbits; 618 if (nrbitsp) 619 *nrbitsp = nrbits; 620 } 621 622 return bsize; 623 } 624 625 /* 626 * Calculate the number of 512byte blocks used. 627 */ 628 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 629 { 630 blkcnt_t used = (tsize + 511) >> 9; 631 return (used > ULONG_MAX) ? ULONG_MAX : used; 632 } 633 634 /* 635 * Compute and set NFS server blocksize 636 */ 637 static inline 638 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 639 { 640 if (bsize < NFS_MIN_FILE_IO_SIZE) 641 bsize = NFS_DEF_FILE_IO_SIZE; 642 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 643 bsize = NFS_MAX_FILE_IO_SIZE; 644 645 return nfs_block_bits(bsize, nrbitsp); 646 } 647 648 /* 649 * Determine the maximum file size for a superblock 650 */ 651 static inline 652 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 653 { 654 sb->s_maxbytes = (loff_t)maxfilesize; 655 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 656 sb->s_maxbytes = MAX_LFS_FILESIZE; 657 } 658 659 /* 660 * Record the page as unstable and mark its inode as dirty. 661 */ 662 static inline 663 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) 664 { 665 if (!cinfo->dreq) { 666 struct inode *inode = page_file_mapping(page)->host; 667 668 inc_node_page_state(page, NR_UNSTABLE_NFS); 669 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE); 670 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 671 } 672 } 673 674 /* 675 * Determine the number of bytes of data the page contains 676 */ 677 static inline 678 unsigned int nfs_page_length(struct page *page) 679 { 680 loff_t i_size = i_size_read(page_file_mapping(page)->host); 681 682 if (i_size > 0) { 683 pgoff_t index = page_index(page); 684 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 685 if (index < end_index) 686 return PAGE_SIZE; 687 if (index == end_index) 688 return ((i_size - 1) & ~PAGE_MASK) + 1; 689 } 690 return 0; 691 } 692 693 /* 694 * Convert a umode to a dirent->d_type 695 */ 696 static inline 697 unsigned char nfs_umode_to_dtype(umode_t mode) 698 { 699 return (mode >> 12) & 15; 700 } 701 702 /* 703 * Determine the number of pages in an array of length 'len' and 704 * with a base offset of 'base' 705 */ 706 static inline 707 unsigned int nfs_page_array_len(unsigned int base, size_t len) 708 { 709 return ((unsigned long)len + (unsigned long)base + 710 PAGE_SIZE - 1) >> PAGE_SHIFT; 711 } 712 713 /* 714 * Convert a struct timespec into a 64-bit change attribute 715 * 716 * This does approximately the same thing as timespec_to_ns(), 717 * but for calculation efficiency, we multiply the seconds by 718 * 1024*1024*1024. 719 */ 720 static inline 721 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 722 { 723 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 724 } 725 726 #ifdef CONFIG_CRC32 727 /** 728 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 729 * @fh - pointer to filehandle 730 * 731 * returns a crc32 hash for the filehandle that is compatible with 732 * the one displayed by "wireshark". 733 */ 734 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 735 { 736 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 737 } 738 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 739 { 740 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 741 NFS4_STATEID_OTHER_SIZE); 742 } 743 #else 744 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 745 { 746 return 0; 747 } 748 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 749 { 750 return 0; 751 } 752 #endif 753 754 static inline bool nfs_error_is_fatal(int err) 755 { 756 switch (err) { 757 case -ERESTARTSYS: 758 case -EACCES: 759 case -EDQUOT: 760 case -EFBIG: 761 case -EIO: 762 case -ENOSPC: 763 case -EROFS: 764 case -ESTALE: 765 case -E2BIG: 766 return true; 767 default: 768 return false; 769 } 770 } 771 772 static inline void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) 773 { 774 ctx->error = error; 775 smp_wmb(); 776 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 777 } 778