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 10 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 11 12 struct nfs_string; 13 14 /* Maximum number of readahead requests 15 * FIXME: this should really be a sysctl so that users may tune it to suit 16 * their needs. People that do NFS over a slow network, might for 17 * instance want to reduce it to something closer to 1 for improved 18 * interactive response. 19 */ 20 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 21 22 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 23 { 24 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 25 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 26 } 27 28 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 29 { 30 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 31 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 32 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 33 return 0; 34 35 fattr->fileid = fattr->mounted_on_fileid; 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 /* 63 * Maximum number of pages that readdir can use for creating 64 * a vmapped array of pages. 65 */ 66 #define NFS_MAX_READDIR_PAGES 8 67 68 struct nfs_client_initdata { 69 unsigned long init_flags; 70 const char *hostname; 71 const struct sockaddr *addr; 72 size_t addrlen; 73 struct nfs_subversion *nfs_mod; 74 int proto; 75 u32 minorversion; 76 struct net *net; 77 }; 78 79 /* 80 * In-kernel mount arguments 81 */ 82 struct nfs_parsed_mount_data { 83 int flags; 84 unsigned int rsize, wsize; 85 unsigned int timeo, retrans; 86 unsigned int acregmin, acregmax, 87 acdirmin, acdirmax; 88 unsigned int namlen; 89 unsigned int options; 90 unsigned int bsize; 91 struct nfs_auth_info auth_info; 92 rpc_authflavor_t selected_flavor; 93 char *client_address; 94 unsigned int version; 95 unsigned int minorversion; 96 char *fscache_uniq; 97 bool need_mount; 98 99 struct { 100 struct sockaddr_storage address; 101 size_t addrlen; 102 char *hostname; 103 u32 version; 104 int port; 105 unsigned short protocol; 106 } mount_server; 107 108 struct { 109 struct sockaddr_storage address; 110 size_t addrlen; 111 char *hostname; 112 char *export_path; 113 int port; 114 unsigned short protocol; 115 } nfs_server; 116 117 struct security_mnt_opts lsm_opts; 118 struct net *net; 119 }; 120 121 /* mount_clnt.c */ 122 struct nfs_mount_request { 123 struct sockaddr *sap; 124 size_t salen; 125 char *hostname; 126 char *dirpath; 127 u32 version; 128 unsigned short protocol; 129 struct nfs_fh *fh; 130 int noresvport; 131 unsigned int *auth_flav_len; 132 rpc_authflavor_t *auth_flavs; 133 struct net *net; 134 }; 135 136 struct nfs_mount_info { 137 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 138 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 139 struct nfs_parsed_mount_data *parsed; 140 struct nfs_clone_mount *cloned; 141 struct nfs_fh *mntfh; 142 }; 143 144 extern int nfs_mount(struct nfs_mount_request *info); 145 extern void nfs_umount(const struct nfs_mount_request *info); 146 147 /* client.c */ 148 extern const struct rpc_program nfs_program; 149 extern void nfs_clients_init(struct net *net); 150 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 151 int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t); 152 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *, 153 const struct rpc_timeout *, const char *, 154 rpc_authflavor_t); 155 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 156 void nfs_server_insert_lists(struct nfs_server *); 157 void nfs_server_remove_lists(struct nfs_server *); 158 void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int); 159 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 160 rpc_authflavor_t); 161 struct nfs_server *nfs_alloc_server(void); 162 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 163 164 extern void nfs_cleanup_cb_ident_idr(struct net *); 165 extern void nfs_put_client(struct nfs_client *); 166 extern void nfs_free_client(struct nfs_client *); 167 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 168 extern struct nfs_client * 169 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 170 struct nfs4_sessionid *, u32); 171 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 172 struct nfs_subversion *); 173 extern struct nfs_server *nfs4_create_server( 174 struct nfs_mount_info *, 175 struct nfs_subversion *); 176 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 177 struct nfs_fh *); 178 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 179 struct sockaddr *sap, size_t salen, 180 struct net *net); 181 extern void nfs_free_server(struct nfs_server *server); 182 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 183 struct nfs_fh *, 184 struct nfs_fattr *, 185 rpc_authflavor_t); 186 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 187 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 188 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 189 const struct sockaddr *ds_addr, 190 int ds_addrlen, int ds_proto, 191 unsigned int ds_timeo, 192 unsigned int ds_retrans); 193 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 194 struct inode *); 195 #ifdef CONFIG_PROC_FS 196 extern int __init nfs_fs_proc_init(void); 197 extern void nfs_fs_proc_exit(void); 198 #else 199 static inline int nfs_fs_proc_init(void) 200 { 201 return 0; 202 } 203 static inline void nfs_fs_proc_exit(void) 204 { 205 } 206 #endif 207 208 #ifdef CONFIG_NFS_V4_1 209 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *); 210 #endif 211 212 /* nfs3client.c */ 213 #if IS_ENABLED(CONFIG_NFS_V3) 214 struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *); 215 struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *, 216 struct nfs_fattr *, rpc_authflavor_t); 217 #endif 218 219 /* callback_xdr.c */ 220 extern struct svc_version nfs4_callback_version1; 221 extern struct svc_version nfs4_callback_version4; 222 223 struct nfs_pageio_descriptor; 224 /* pagelist.c */ 225 extern int __init nfs_init_nfspagecache(void); 226 extern void nfs_destroy_nfspagecache(void); 227 extern int __init nfs_init_readpagecache(void); 228 extern void nfs_destroy_readpagecache(void); 229 extern int __init nfs_init_writepagecache(void); 230 extern void nfs_destroy_writepagecache(void); 231 232 extern int __init nfs_init_directcache(void); 233 extern void nfs_destroy_directcache(void); 234 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 235 struct nfs_pgio_header *hdr, 236 void (*release)(struct nfs_pgio_header *hdr)); 237 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 238 int nfs_iocounter_wait(struct nfs_io_counter *c); 239 240 struct nfs_rw_header *nfs_rw_header_alloc(const struct nfs_rw_ops *); 241 void nfs_rw_header_free(struct nfs_pgio_header *); 242 void nfs_pgio_data_release(struct nfs_pgio_data *); 243 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 244 int nfs_initiate_pgio(struct rpc_clnt *, struct nfs_pgio_data *, 245 const struct rpc_call_ops *, int, int); 246 int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *); 247 248 static inline void nfs_iocounter_init(struct nfs_io_counter *c) 249 { 250 c->flags = 0; 251 atomic_set(&c->io_count, 0); 252 } 253 254 /* nfs2xdr.c */ 255 extern struct rpc_procinfo nfs_procedures[]; 256 extern int nfs2_decode_dirent(struct xdr_stream *, 257 struct nfs_entry *, int); 258 259 /* nfs3xdr.c */ 260 extern struct rpc_procinfo nfs3_procedures[]; 261 extern int nfs3_decode_dirent(struct xdr_stream *, 262 struct nfs_entry *, int); 263 264 /* nfs4xdr.c */ 265 #if IS_ENABLED(CONFIG_NFS_V4) 266 extern int nfs4_decode_dirent(struct xdr_stream *, 267 struct nfs_entry *, int); 268 #endif 269 #ifdef CONFIG_NFS_V4_1 270 extern const u32 nfs41_maxread_overhead; 271 extern const u32 nfs41_maxwrite_overhead; 272 extern const u32 nfs41_maxgetdevinfo_overhead; 273 #endif 274 275 /* nfs4proc.c */ 276 #if IS_ENABLED(CONFIG_NFS_V4) 277 extern struct rpc_procinfo nfs4_procedures[]; 278 #endif 279 280 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 281 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 282 static inline void nfs4_label_free(struct nfs4_label *label) 283 { 284 if (label) { 285 kfree(label->label); 286 kfree(label); 287 } 288 return; 289 } 290 291 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 292 { 293 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 294 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 295 } 296 #else 297 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 298 static inline void nfs4_label_free(void *label) {} 299 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 300 { 301 } 302 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 303 304 /* proc.c */ 305 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 306 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 307 const struct rpc_timeout *timeparms, 308 const char *ip_addr); 309 310 /* dir.c */ 311 extern void nfs_force_use_readdirplus(struct inode *dir); 312 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 313 struct shrink_control *sc); 314 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 315 struct shrink_control *sc); 316 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 317 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 318 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 319 int nfs_rmdir(struct inode *, struct dentry *); 320 int nfs_unlink(struct inode *, struct dentry *); 321 int nfs_symlink(struct inode *, struct dentry *, const char *); 322 int nfs_link(struct dentry *, struct inode *, struct dentry *); 323 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 324 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 325 326 /* file.c */ 327 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int); 328 loff_t nfs_file_llseek(struct file *, loff_t, int); 329 int nfs_file_flush(struct file *, fl_owner_t); 330 ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); 331 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, 332 size_t, unsigned int); 333 int nfs_file_mmap(struct file *, struct vm_area_struct *); 334 ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); 335 int nfs_file_release(struct inode *, struct file *); 336 int nfs_lock(struct file *, int, struct file_lock *); 337 int nfs_flock(struct file *, int, struct file_lock *); 338 ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *, 339 size_t, unsigned int); 340 int nfs_check_flags(int); 341 int nfs_setlease(struct file *, long, struct file_lock **); 342 343 /* inode.c */ 344 extern struct workqueue_struct *nfsiod_workqueue; 345 extern struct inode *nfs_alloc_inode(struct super_block *sb); 346 extern void nfs_destroy_inode(struct inode *); 347 extern int nfs_write_inode(struct inode *, struct writeback_control *); 348 extern int nfs_drop_inode(struct inode *); 349 extern void nfs_clear_inode(struct inode *); 350 extern void nfs_evict_inode(struct inode *); 351 void nfs_zap_acl_cache(struct inode *inode); 352 extern int nfs_wait_bit_killable(void *word); 353 354 /* super.c */ 355 extern const struct super_operations nfs_sops; 356 extern struct file_system_type nfs_fs_type; 357 extern struct file_system_type nfs_xdev_fs_type; 358 #if IS_ENABLED(CONFIG_NFS_V4) 359 extern struct file_system_type nfs4_xdev_fs_type; 360 extern struct file_system_type nfs4_referral_fs_type; 361 #endif 362 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 363 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 364 struct nfs_subversion *); 365 void nfs_initialise_sb(struct super_block *); 366 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 367 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 368 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 369 struct nfs_mount_info *, struct nfs_subversion *); 370 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 371 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 372 const char *, struct nfs_mount_info *); 373 void nfs_kill_super(struct super_block *); 374 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 375 376 extern struct rpc_stat nfs_rpcstat; 377 378 extern int __init register_nfs_fs(void); 379 extern void __exit unregister_nfs_fs(void); 380 extern void nfs_sb_active(struct super_block *sb); 381 extern void nfs_sb_deactive(struct super_block *sb); 382 383 /* namespace.c */ 384 #define NFS_PATH_CANONICAL 1 385 extern char *nfs_path(char **p, struct dentry *dentry, 386 char *buffer, ssize_t buflen, unsigned flags); 387 extern struct vfsmount *nfs_d_automount(struct path *path); 388 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 389 struct nfs_fh *, struct nfs_fattr *); 390 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 391 struct nfs_fattr *, rpc_authflavor_t); 392 393 /* getroot.c */ 394 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 395 const char *); 396 #if IS_ENABLED(CONFIG_NFS_V4) 397 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 398 const char *); 399 400 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 401 #endif 402 403 struct nfs_pgio_completion_ops; 404 /* read.c */ 405 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 406 struct inode *inode, bool force_mds, 407 const struct nfs_pgio_completion_ops *compl_ops); 408 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 409 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 410 411 /* super.c */ 412 void nfs_clone_super(struct super_block *, struct nfs_mount_info *); 413 void nfs_umount_begin(struct super_block *); 414 int nfs_statfs(struct dentry *, struct kstatfs *); 415 int nfs_show_options(struct seq_file *, struct dentry *); 416 int nfs_show_devname(struct seq_file *, struct dentry *); 417 int nfs_show_path(struct seq_file *, struct dentry *); 418 int nfs_show_stats(struct seq_file *, struct dentry *); 419 void nfs_put_super(struct super_block *); 420 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 421 422 /* write.c */ 423 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 424 struct inode *inode, int ioflags, bool force_mds, 425 const struct nfs_pgio_completion_ops *compl_ops); 426 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 427 extern void nfs_commit_free(struct nfs_commit_data *p); 428 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 429 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 430 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 431 struct nfs_commit_data *data, 432 const struct rpc_call_ops *call_ops, 433 int how, int flags); 434 extern void nfs_init_commit(struct nfs_commit_data *data, 435 struct list_head *head, 436 struct pnfs_layout_segment *lseg, 437 struct nfs_commit_info *cinfo); 438 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 439 struct nfs_commit_info *cinfo, int max); 440 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 441 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 442 struct nfs_commit_info *cinfo); 443 void nfs_mark_request_commit(struct nfs_page *req, 444 struct pnfs_layout_segment *lseg, 445 struct nfs_commit_info *cinfo); 446 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 447 int how, struct nfs_commit_info *cinfo); 448 void nfs_retry_commit(struct list_head *page_list, 449 struct pnfs_layout_segment *lseg, 450 struct nfs_commit_info *cinfo); 451 void nfs_commitdata_release(struct nfs_commit_data *data); 452 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 453 struct nfs_commit_info *cinfo); 454 void nfs_request_remove_commit_list(struct nfs_page *req, 455 struct nfs_commit_info *cinfo); 456 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 457 struct inode *inode, 458 struct nfs_direct_req *dreq); 459 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 460 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx); 461 462 #ifdef CONFIG_MIGRATION 463 extern int nfs_migrate_page(struct address_space *, 464 struct page *, struct page *, enum migrate_mode); 465 #else 466 #define nfs_migrate_page NULL 467 #endif 468 469 /* unlink.c */ 470 extern struct rpc_task * 471 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 472 struct dentry *old_dentry, struct dentry *new_dentry, 473 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 474 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 475 476 /* direct.c */ 477 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 478 struct nfs_direct_req *dreq); 479 static inline void nfs_inode_dio_wait(struct inode *inode) 480 { 481 inode_dio_wait(inode); 482 } 483 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 484 485 /* nfs4proc.c */ 486 extern void __nfs4_read_done_cb(struct nfs_pgio_data *); 487 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 488 const struct rpc_timeout *timeparms, 489 const char *ip_addr); 490 extern int nfs40_walk_client_list(struct nfs_client *clp, 491 struct nfs_client **result, 492 struct rpc_cred *cred); 493 extern int nfs41_walk_client_list(struct nfs_client *clp, 494 struct nfs_client **result, 495 struct rpc_cred *cred); 496 497 /* 498 * Determine the device name as a string 499 */ 500 static inline char *nfs_devname(struct dentry *dentry, 501 char *buffer, ssize_t buflen) 502 { 503 char *dummy; 504 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 505 } 506 507 /* 508 * Determine the actual block size (and log2 thereof) 509 */ 510 static inline 511 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 512 { 513 /* make sure blocksize is a power of two */ 514 if ((bsize & (bsize - 1)) || nrbitsp) { 515 unsigned char nrbits; 516 517 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 518 ; 519 bsize = 1 << nrbits; 520 if (nrbitsp) 521 *nrbitsp = nrbits; 522 } 523 524 return bsize; 525 } 526 527 /* 528 * Calculate the number of 512byte blocks used. 529 */ 530 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 531 { 532 blkcnt_t used = (tsize + 511) >> 9; 533 return (used > ULONG_MAX) ? ULONG_MAX : used; 534 } 535 536 /* 537 * Compute and set NFS server blocksize 538 */ 539 static inline 540 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 541 { 542 if (bsize < NFS_MIN_FILE_IO_SIZE) 543 bsize = NFS_DEF_FILE_IO_SIZE; 544 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 545 bsize = NFS_MAX_FILE_IO_SIZE; 546 547 return nfs_block_bits(bsize, nrbitsp); 548 } 549 550 /* 551 * Determine the maximum file size for a superblock 552 */ 553 static inline 554 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 555 { 556 sb->s_maxbytes = (loff_t)maxfilesize; 557 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 558 sb->s_maxbytes = MAX_LFS_FILESIZE; 559 } 560 561 /* 562 * Determine the number of bytes of data the page contains 563 */ 564 static inline 565 unsigned int nfs_page_length(struct page *page) 566 { 567 loff_t i_size = i_size_read(page_file_mapping(page)->host); 568 569 if (i_size > 0) { 570 pgoff_t page_index = page_file_index(page); 571 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 572 if (page_index < end_index) 573 return PAGE_CACHE_SIZE; 574 if (page_index == end_index) 575 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 576 } 577 return 0; 578 } 579 580 /* 581 * Convert a umode to a dirent->d_type 582 */ 583 static inline 584 unsigned char nfs_umode_to_dtype(umode_t mode) 585 { 586 return (mode >> 12) & 15; 587 } 588 589 /* 590 * Determine the number of pages in an array of length 'len' and 591 * with a base offset of 'base' 592 */ 593 static inline 594 unsigned int nfs_page_array_len(unsigned int base, size_t len) 595 { 596 return ((unsigned long)len + (unsigned long)base + 597 PAGE_SIZE - 1) >> PAGE_SHIFT; 598 } 599 600 /* 601 * Convert a struct timespec into a 64-bit change attribute 602 * 603 * This does approximately the same thing as timespec_to_ns(), 604 * but for calculation efficiency, we multiply the seconds by 605 * 1024*1024*1024. 606 */ 607 static inline 608 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 609 { 610 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 611 } 612 613 #ifdef CONFIG_CRC32 614 /** 615 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 616 * @fh - pointer to filehandle 617 * 618 * returns a crc32 hash for the filehandle that is compatible with 619 * the one displayed by "wireshark". 620 */ 621 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 622 { 623 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 624 } 625 #else 626 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 627 { 628 return 0; 629 } 630 #endif 631