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 extern int nfs_fs_proc_net_init(struct net *net); 199 extern void nfs_fs_proc_net_exit(struct net *net); 200 #else 201 static inline int nfs_fs_proc_net_init(struct net *net) 202 { 203 return 0; 204 } 205 static inline void nfs_fs_proc_net_exit(struct net *net) 206 { 207 } 208 static inline int nfs_fs_proc_init(void) 209 { 210 return 0; 211 } 212 static inline void nfs_fs_proc_exit(void) 213 { 214 } 215 #endif 216 217 #ifdef CONFIG_NFS_V4_1 218 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *); 219 #endif 220 221 /* nfs3client.c */ 222 #if IS_ENABLED(CONFIG_NFS_V3) 223 struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *); 224 struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *, 225 struct nfs_fattr *, rpc_authflavor_t); 226 #endif 227 228 /* callback_xdr.c */ 229 extern struct svc_version nfs4_callback_version1; 230 extern 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_io_counter *c); 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 *, struct nfs_pgio_header *, 255 const struct rpc_call_ops *, int, int); 256 void nfs_free_request(struct nfs_page *req); 257 258 static inline void nfs_iocounter_init(struct nfs_io_counter *c) 259 { 260 c->flags = 0; 261 atomic_set(&c->io_count, 0); 262 } 263 264 /* nfs2xdr.c */ 265 extern struct rpc_procinfo nfs_procedures[]; 266 extern int nfs2_decode_dirent(struct xdr_stream *, 267 struct nfs_entry *, int); 268 269 /* nfs3xdr.c */ 270 extern struct rpc_procinfo nfs3_procedures[]; 271 extern int nfs3_decode_dirent(struct xdr_stream *, 272 struct nfs_entry *, int); 273 274 /* nfs4xdr.c */ 275 #if IS_ENABLED(CONFIG_NFS_V4) 276 extern int nfs4_decode_dirent(struct xdr_stream *, 277 struct nfs_entry *, int); 278 #endif 279 #ifdef CONFIG_NFS_V4_1 280 extern const u32 nfs41_maxread_overhead; 281 extern const u32 nfs41_maxwrite_overhead; 282 extern const u32 nfs41_maxgetdevinfo_overhead; 283 #endif 284 285 /* nfs4proc.c */ 286 #if IS_ENABLED(CONFIG_NFS_V4) 287 extern struct rpc_procinfo nfs4_procedures[]; 288 #endif 289 290 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 291 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 292 static inline void nfs4_label_free(struct nfs4_label *label) 293 { 294 if (label) { 295 kfree(label->label); 296 kfree(label); 297 } 298 return; 299 } 300 301 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 302 { 303 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 304 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 305 } 306 #else 307 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 308 static inline void nfs4_label_free(void *label) {} 309 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 310 { 311 } 312 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 313 314 /* proc.c */ 315 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 316 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 317 const struct rpc_timeout *timeparms, 318 const char *ip_addr); 319 320 /* dir.c */ 321 extern void nfs_force_use_readdirplus(struct inode *dir); 322 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 323 struct shrink_control *sc); 324 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 325 struct shrink_control *sc); 326 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 327 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 328 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 329 int nfs_rmdir(struct inode *, struct dentry *); 330 int nfs_unlink(struct inode *, struct dentry *); 331 int nfs_symlink(struct inode *, struct dentry *, const char *); 332 int nfs_link(struct dentry *, struct inode *, struct dentry *); 333 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 334 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 335 336 /* file.c */ 337 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int); 338 loff_t nfs_file_llseek(struct file *, loff_t, int); 339 int nfs_file_flush(struct file *, fl_owner_t); 340 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 341 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, 342 size_t, unsigned int); 343 int nfs_file_mmap(struct file *, struct vm_area_struct *); 344 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 345 int nfs_file_release(struct inode *, struct file *); 346 int nfs_lock(struct file *, int, struct file_lock *); 347 int nfs_flock(struct file *, int, struct file_lock *); 348 int nfs_check_flags(int); 349 int nfs_setlease(struct file *, long, struct file_lock **); 350 351 /* inode.c */ 352 extern struct workqueue_struct *nfsiod_workqueue; 353 extern struct inode *nfs_alloc_inode(struct super_block *sb); 354 extern void nfs_destroy_inode(struct inode *); 355 extern int nfs_write_inode(struct inode *, struct writeback_control *); 356 extern int nfs_drop_inode(struct inode *); 357 extern void nfs_clear_inode(struct inode *); 358 extern void nfs_evict_inode(struct inode *); 359 void nfs_zap_acl_cache(struct inode *inode); 360 extern int nfs_wait_bit_killable(struct wait_bit_key *key); 361 362 /* super.c */ 363 extern const struct super_operations nfs_sops; 364 extern struct file_system_type nfs_fs_type; 365 extern struct file_system_type nfs_xdev_fs_type; 366 #if IS_ENABLED(CONFIG_NFS_V4) 367 extern struct file_system_type nfs4_xdev_fs_type; 368 extern struct file_system_type nfs4_referral_fs_type; 369 #endif 370 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 371 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 372 struct nfs_subversion *); 373 void nfs_initialise_sb(struct super_block *); 374 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 375 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 376 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 377 struct nfs_mount_info *, struct nfs_subversion *); 378 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 379 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 380 const char *, struct nfs_mount_info *); 381 void nfs_kill_super(struct super_block *); 382 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 383 384 extern struct rpc_stat nfs_rpcstat; 385 386 extern int __init register_nfs_fs(void); 387 extern void __exit unregister_nfs_fs(void); 388 extern void nfs_sb_active(struct super_block *sb); 389 extern void nfs_sb_deactive(struct super_block *sb); 390 391 /* namespace.c */ 392 #define NFS_PATH_CANONICAL 1 393 extern char *nfs_path(char **p, struct dentry *dentry, 394 char *buffer, ssize_t buflen, unsigned flags); 395 extern struct vfsmount *nfs_d_automount(struct path *path); 396 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 397 struct nfs_fh *, struct nfs_fattr *); 398 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 399 struct nfs_fattr *, rpc_authflavor_t); 400 401 /* getroot.c */ 402 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 403 const char *); 404 #if IS_ENABLED(CONFIG_NFS_V4) 405 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 406 const char *); 407 408 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 409 #endif 410 411 struct nfs_pgio_completion_ops; 412 /* read.c */ 413 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 414 struct inode *inode, bool force_mds, 415 const struct nfs_pgio_completion_ops *compl_ops); 416 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 417 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 418 419 /* super.c */ 420 void nfs_clone_super(struct super_block *, struct nfs_mount_info *); 421 void nfs_umount_begin(struct super_block *); 422 int nfs_statfs(struct dentry *, struct kstatfs *); 423 int nfs_show_options(struct seq_file *, struct dentry *); 424 int nfs_show_devname(struct seq_file *, struct dentry *); 425 int nfs_show_path(struct seq_file *, struct dentry *); 426 int nfs_show_stats(struct seq_file *, struct dentry *); 427 void nfs_put_super(struct super_block *); 428 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 429 430 /* write.c */ 431 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 432 struct inode *inode, int ioflags, bool force_mds, 433 const struct nfs_pgio_completion_ops *compl_ops); 434 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 435 extern void nfs_commit_free(struct nfs_commit_data *p); 436 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 437 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 438 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 439 struct nfs_commit_data *data, 440 const struct rpc_call_ops *call_ops, 441 int how, int flags); 442 extern void nfs_init_commit(struct nfs_commit_data *data, 443 struct list_head *head, 444 struct pnfs_layout_segment *lseg, 445 struct nfs_commit_info *cinfo); 446 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 447 struct nfs_commit_info *cinfo, int max); 448 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 449 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 450 struct nfs_commit_info *cinfo); 451 void nfs_mark_request_commit(struct nfs_page *req, 452 struct pnfs_layout_segment *lseg, 453 struct nfs_commit_info *cinfo); 454 int nfs_write_need_commit(struct nfs_pgio_header *); 455 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 456 int how, struct nfs_commit_info *cinfo); 457 void nfs_retry_commit(struct list_head *page_list, 458 struct pnfs_layout_segment *lseg, 459 struct nfs_commit_info *cinfo); 460 void nfs_commitdata_release(struct nfs_commit_data *data); 461 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 462 struct nfs_commit_info *cinfo); 463 void nfs_request_remove_commit_list(struct nfs_page *req, 464 struct nfs_commit_info *cinfo); 465 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 466 struct inode *inode, 467 struct nfs_direct_req *dreq); 468 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 469 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx); 470 471 #ifdef CONFIG_MIGRATION 472 extern int nfs_migrate_page(struct address_space *, 473 struct page *, struct page *, enum migrate_mode); 474 #else 475 #define nfs_migrate_page NULL 476 #endif 477 478 /* unlink.c */ 479 extern struct rpc_task * 480 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 481 struct dentry *old_dentry, struct dentry *new_dentry, 482 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 483 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 484 485 /* direct.c */ 486 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 487 struct nfs_direct_req *dreq); 488 static inline void nfs_inode_dio_wait(struct inode *inode) 489 { 490 inode_dio_wait(inode); 491 } 492 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 493 494 /* nfs4proc.c */ 495 extern void __nfs4_read_done_cb(struct nfs_pgio_header *); 496 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 497 const struct rpc_timeout *timeparms, 498 const char *ip_addr); 499 extern int nfs40_walk_client_list(struct nfs_client *clp, 500 struct nfs_client **result, 501 struct rpc_cred *cred); 502 extern int nfs41_walk_client_list(struct nfs_client *clp, 503 struct nfs_client **result, 504 struct rpc_cred *cred); 505 506 /* 507 * Determine the device name as a string 508 */ 509 static inline char *nfs_devname(struct dentry *dentry, 510 char *buffer, ssize_t buflen) 511 { 512 char *dummy; 513 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 514 } 515 516 /* 517 * Determine the actual block size (and log2 thereof) 518 */ 519 static inline 520 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 521 { 522 /* make sure blocksize is a power of two */ 523 if ((bsize & (bsize - 1)) || nrbitsp) { 524 unsigned char nrbits; 525 526 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 527 ; 528 bsize = 1 << nrbits; 529 if (nrbitsp) 530 *nrbitsp = nrbits; 531 } 532 533 return bsize; 534 } 535 536 /* 537 * Calculate the number of 512byte blocks used. 538 */ 539 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 540 { 541 blkcnt_t used = (tsize + 511) >> 9; 542 return (used > ULONG_MAX) ? ULONG_MAX : used; 543 } 544 545 /* 546 * Compute and set NFS server blocksize 547 */ 548 static inline 549 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 550 { 551 if (bsize < NFS_MIN_FILE_IO_SIZE) 552 bsize = NFS_DEF_FILE_IO_SIZE; 553 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 554 bsize = NFS_MAX_FILE_IO_SIZE; 555 556 return nfs_block_bits(bsize, nrbitsp); 557 } 558 559 /* 560 * Determine the maximum file size for a superblock 561 */ 562 static inline 563 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 564 { 565 sb->s_maxbytes = (loff_t)maxfilesize; 566 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 567 sb->s_maxbytes = MAX_LFS_FILESIZE; 568 } 569 570 /* 571 * Determine the number of bytes of data the page contains 572 */ 573 static inline 574 unsigned int nfs_page_length(struct page *page) 575 { 576 loff_t i_size = i_size_read(page_file_mapping(page)->host); 577 578 if (i_size > 0) { 579 pgoff_t page_index = page_file_index(page); 580 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 581 if (page_index < end_index) 582 return PAGE_CACHE_SIZE; 583 if (page_index == end_index) 584 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 585 } 586 return 0; 587 } 588 589 /* 590 * Convert a umode to a dirent->d_type 591 */ 592 static inline 593 unsigned char nfs_umode_to_dtype(umode_t mode) 594 { 595 return (mode >> 12) & 15; 596 } 597 598 /* 599 * Determine the number of pages in an array of length 'len' and 600 * with a base offset of 'base' 601 */ 602 static inline 603 unsigned int nfs_page_array_len(unsigned int base, size_t len) 604 { 605 return ((unsigned long)len + (unsigned long)base + 606 PAGE_SIZE - 1) >> PAGE_SHIFT; 607 } 608 609 /* 610 * Convert a struct timespec into a 64-bit change attribute 611 * 612 * This does approximately the same thing as timespec_to_ns(), 613 * but for calculation efficiency, we multiply the seconds by 614 * 1024*1024*1024. 615 */ 616 static inline 617 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 618 { 619 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 620 } 621 622 #ifdef CONFIG_CRC32 623 /** 624 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 625 * @fh - pointer to filehandle 626 * 627 * returns a crc32 hash for the filehandle that is compatible with 628 * the one displayed by "wireshark". 629 */ 630 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 631 { 632 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 633 } 634 #else 635 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 636 { 637 return 0; 638 } 639 #endif 640