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 unsigned int auth_flavor_len; 92 rpc_authflavor_t auth_flavors[1]; 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_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int); 158 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 159 rpc_authflavor_t); 160 struct nfs_server *nfs_alloc_server(void); 161 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 162 163 extern void nfs_cleanup_cb_ident_idr(struct net *); 164 extern void nfs_put_client(struct nfs_client *); 165 extern void nfs_free_client(struct nfs_client *); 166 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 167 extern struct nfs_client * 168 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 169 struct nfs4_sessionid *, u32); 170 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 171 struct nfs_subversion *); 172 extern struct nfs_server *nfs4_create_server( 173 struct nfs_mount_info *, 174 struct nfs_subversion *); 175 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 176 struct nfs_fh *); 177 extern void nfs_free_server(struct nfs_server *server); 178 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 179 struct nfs_fh *, 180 struct nfs_fattr *, 181 rpc_authflavor_t); 182 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 183 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 184 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 185 const struct sockaddr *ds_addr, 186 int ds_addrlen, int ds_proto, 187 unsigned int ds_timeo, 188 unsigned int ds_retrans); 189 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 190 struct inode *); 191 #ifdef CONFIG_PROC_FS 192 extern int __init nfs_fs_proc_init(void); 193 extern void nfs_fs_proc_exit(void); 194 #else 195 static inline int nfs_fs_proc_init(void) 196 { 197 return 0; 198 } 199 static inline void nfs_fs_proc_exit(void) 200 { 201 } 202 #endif 203 204 #ifdef CONFIG_NFS_V4_1 205 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *); 206 #endif 207 208 /* nfs3client.c */ 209 #if IS_ENABLED(CONFIG_NFS_V3) 210 struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *); 211 struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *, 212 struct nfs_fattr *, rpc_authflavor_t); 213 #endif 214 215 /* callback_xdr.c */ 216 extern struct svc_version nfs4_callback_version1; 217 extern struct svc_version nfs4_callback_version4; 218 219 struct nfs_pageio_descriptor; 220 /* pagelist.c */ 221 extern int __init nfs_init_nfspagecache(void); 222 extern void nfs_destroy_nfspagecache(void); 223 extern int __init nfs_init_readpagecache(void); 224 extern void nfs_destroy_readpagecache(void); 225 extern int __init nfs_init_writepagecache(void); 226 extern void nfs_destroy_writepagecache(void); 227 228 extern int __init nfs_init_directcache(void); 229 extern void nfs_destroy_directcache(void); 230 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount); 231 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 232 struct nfs_pgio_header *hdr, 233 void (*release)(struct nfs_pgio_header *hdr)); 234 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 235 int nfs_iocounter_wait(struct nfs_io_counter *c); 236 237 static inline void nfs_iocounter_init(struct nfs_io_counter *c) 238 { 239 c->flags = 0; 240 atomic_set(&c->io_count, 0); 241 } 242 243 /* nfs2xdr.c */ 244 extern struct rpc_procinfo nfs_procedures[]; 245 extern int nfs2_decode_dirent(struct xdr_stream *, 246 struct nfs_entry *, int); 247 248 /* nfs3xdr.c */ 249 extern struct rpc_procinfo nfs3_procedures[]; 250 extern int nfs3_decode_dirent(struct xdr_stream *, 251 struct nfs_entry *, int); 252 253 /* nfs4xdr.c */ 254 #if IS_ENABLED(CONFIG_NFS_V4) 255 extern int nfs4_decode_dirent(struct xdr_stream *, 256 struct nfs_entry *, int); 257 #endif 258 #ifdef CONFIG_NFS_V4_1 259 extern const u32 nfs41_maxread_overhead; 260 extern const u32 nfs41_maxwrite_overhead; 261 extern const u32 nfs41_maxgetdevinfo_overhead; 262 #endif 263 264 /* nfs4proc.c */ 265 #if IS_ENABLED(CONFIG_NFS_V4) 266 extern struct rpc_procinfo nfs4_procedures[]; 267 #endif 268 269 /* proc.c */ 270 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 271 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 272 const struct rpc_timeout *timeparms, 273 const char *ip_addr); 274 275 /* dir.c */ 276 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 277 struct shrink_control *sc); 278 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 279 struct shrink_control *sc); 280 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 281 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 282 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 283 int nfs_rmdir(struct inode *, struct dentry *); 284 int nfs_unlink(struct inode *, struct dentry *); 285 int nfs_symlink(struct inode *, struct dentry *, const char *); 286 int nfs_link(struct dentry *, struct inode *, struct dentry *); 287 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 288 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 289 290 /* file.c */ 291 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int); 292 loff_t nfs_file_llseek(struct file *, loff_t, int); 293 int nfs_file_flush(struct file *, fl_owner_t); 294 ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); 295 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, 296 size_t, unsigned int); 297 int nfs_file_mmap(struct file *, struct vm_area_struct *); 298 ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); 299 int nfs_file_release(struct inode *, struct file *); 300 int nfs_lock(struct file *, int, struct file_lock *); 301 int nfs_flock(struct file *, int, struct file_lock *); 302 ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *, 303 size_t, unsigned int); 304 int nfs_check_flags(int); 305 int nfs_setlease(struct file *, long, struct file_lock **); 306 307 /* inode.c */ 308 extern struct workqueue_struct *nfsiod_workqueue; 309 extern struct inode *nfs_alloc_inode(struct super_block *sb); 310 extern void nfs_destroy_inode(struct inode *); 311 extern int nfs_write_inode(struct inode *, struct writeback_control *); 312 extern int nfs_drop_inode(struct inode *); 313 extern void nfs_clear_inode(struct inode *); 314 extern void nfs_evict_inode(struct inode *); 315 void nfs_zap_acl_cache(struct inode *inode); 316 extern int nfs_wait_bit_killable(void *word); 317 318 /* super.c */ 319 extern const struct super_operations nfs_sops; 320 extern struct file_system_type nfs_fs_type; 321 extern struct file_system_type nfs_xdev_fs_type; 322 #if IS_ENABLED(CONFIG_NFS_V4) 323 extern struct file_system_type nfs4_xdev_fs_type; 324 extern struct file_system_type nfs4_referral_fs_type; 325 #endif 326 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 327 struct nfs_subversion *); 328 void nfs_initialise_sb(struct super_block *); 329 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 330 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 331 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 332 struct nfs_mount_info *, struct nfs_subversion *); 333 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 334 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 335 const char *, struct nfs_mount_info *); 336 void nfs_kill_super(struct super_block *); 337 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 338 339 extern struct rpc_stat nfs_rpcstat; 340 341 extern int __init register_nfs_fs(void); 342 extern void __exit unregister_nfs_fs(void); 343 extern void nfs_sb_active(struct super_block *sb); 344 extern void nfs_sb_deactive(struct super_block *sb); 345 346 /* namespace.c */ 347 #define NFS_PATH_CANONICAL 1 348 extern char *nfs_path(char **p, struct dentry *dentry, 349 char *buffer, ssize_t buflen, unsigned flags); 350 extern struct vfsmount *nfs_d_automount(struct path *path); 351 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 352 struct nfs_fh *, struct nfs_fattr *); 353 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 354 struct nfs_fattr *, rpc_authflavor_t); 355 356 /* getroot.c */ 357 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 358 const char *); 359 #if IS_ENABLED(CONFIG_NFS_V4) 360 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 361 const char *); 362 363 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 364 #endif 365 366 struct nfs_pgio_completion_ops; 367 /* read.c */ 368 extern struct nfs_read_header *nfs_readhdr_alloc(void); 369 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr); 370 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 371 struct inode *inode, 372 const struct nfs_pgio_completion_ops *compl_ops); 373 extern int nfs_initiate_read(struct rpc_clnt *clnt, 374 struct nfs_read_data *data, 375 const struct rpc_call_ops *call_ops, int flags); 376 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 377 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc, 378 struct nfs_pgio_header *hdr); 379 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 380 extern void nfs_readdata_release(struct nfs_read_data *rdata); 381 382 /* super.c */ 383 void nfs_clone_super(struct super_block *, struct nfs_mount_info *); 384 void nfs_umount_begin(struct super_block *); 385 int nfs_statfs(struct dentry *, struct kstatfs *); 386 int nfs_show_options(struct seq_file *, struct dentry *); 387 int nfs_show_devname(struct seq_file *, struct dentry *); 388 int nfs_show_path(struct seq_file *, struct dentry *); 389 int nfs_show_stats(struct seq_file *, struct dentry *); 390 void nfs_put_super(struct super_block *); 391 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 392 393 /* write.c */ 394 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 395 struct inode *inode, int ioflags, 396 const struct nfs_pgio_completion_ops *compl_ops); 397 extern struct nfs_write_header *nfs_writehdr_alloc(void); 398 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr); 399 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc, 400 struct nfs_pgio_header *hdr); 401 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 402 extern void nfs_writedata_release(struct nfs_write_data *wdata); 403 extern void nfs_commit_free(struct nfs_commit_data *p); 404 extern int nfs_initiate_write(struct rpc_clnt *clnt, 405 struct nfs_write_data *data, 406 const struct rpc_call_ops *call_ops, 407 int how, int flags); 408 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 409 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 410 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 411 struct nfs_commit_data *data, 412 const struct rpc_call_ops *call_ops, 413 int how, int flags); 414 extern void nfs_init_commit(struct nfs_commit_data *data, 415 struct list_head *head, 416 struct pnfs_layout_segment *lseg, 417 struct nfs_commit_info *cinfo); 418 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 419 struct nfs_commit_info *cinfo, int max); 420 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 421 struct nfs_commit_info *cinfo); 422 void nfs_mark_request_commit(struct nfs_page *req, 423 struct pnfs_layout_segment *lseg, 424 struct nfs_commit_info *cinfo); 425 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 426 int how, struct nfs_commit_info *cinfo); 427 void nfs_retry_commit(struct list_head *page_list, 428 struct pnfs_layout_segment *lseg, 429 struct nfs_commit_info *cinfo); 430 void nfs_commitdata_release(struct nfs_commit_data *data); 431 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 432 struct nfs_commit_info *cinfo); 433 void nfs_request_remove_commit_list(struct nfs_page *req, 434 struct nfs_commit_info *cinfo); 435 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 436 struct inode *inode, 437 struct nfs_direct_req *dreq); 438 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 439 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx); 440 441 #ifdef CONFIG_MIGRATION 442 extern int nfs_migrate_page(struct address_space *, 443 struct page *, struct page *, enum migrate_mode); 444 #else 445 #define nfs_migrate_page NULL 446 #endif 447 448 /* direct.c */ 449 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 450 struct nfs_direct_req *dreq); 451 static inline void nfs_inode_dio_wait(struct inode *inode) 452 { 453 inode_dio_wait(inode); 454 } 455 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 456 457 /* nfs4proc.c */ 458 extern void __nfs4_read_done_cb(struct nfs_read_data *); 459 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 460 const struct rpc_timeout *timeparms, 461 const char *ip_addr); 462 extern int nfs40_walk_client_list(struct nfs_client *clp, 463 struct nfs_client **result, 464 struct rpc_cred *cred); 465 extern int nfs41_walk_client_list(struct nfs_client *clp, 466 struct nfs_client **result, 467 struct rpc_cred *cred); 468 469 /* 470 * Determine the device name as a string 471 */ 472 static inline char *nfs_devname(struct dentry *dentry, 473 char *buffer, ssize_t buflen) 474 { 475 char *dummy; 476 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 477 } 478 479 /* 480 * Determine the actual block size (and log2 thereof) 481 */ 482 static inline 483 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 484 { 485 /* make sure blocksize is a power of two */ 486 if ((bsize & (bsize - 1)) || nrbitsp) { 487 unsigned char nrbits; 488 489 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 490 ; 491 bsize = 1 << nrbits; 492 if (nrbitsp) 493 *nrbitsp = nrbits; 494 } 495 496 return bsize; 497 } 498 499 /* 500 * Calculate the number of 512byte blocks used. 501 */ 502 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 503 { 504 blkcnt_t used = (tsize + 511) >> 9; 505 return (used > ULONG_MAX) ? ULONG_MAX : used; 506 } 507 508 /* 509 * Compute and set NFS server blocksize 510 */ 511 static inline 512 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 513 { 514 if (bsize < NFS_MIN_FILE_IO_SIZE) 515 bsize = NFS_DEF_FILE_IO_SIZE; 516 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 517 bsize = NFS_MAX_FILE_IO_SIZE; 518 519 return nfs_block_bits(bsize, nrbitsp); 520 } 521 522 /* 523 * Determine the maximum file size for a superblock 524 */ 525 static inline 526 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 527 { 528 sb->s_maxbytes = (loff_t)maxfilesize; 529 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 530 sb->s_maxbytes = MAX_LFS_FILESIZE; 531 } 532 533 /* 534 * Determine the number of bytes of data the page contains 535 */ 536 static inline 537 unsigned int nfs_page_length(struct page *page) 538 { 539 loff_t i_size = i_size_read(page_file_mapping(page)->host); 540 541 if (i_size > 0) { 542 pgoff_t page_index = page_file_index(page); 543 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 544 if (page_index < end_index) 545 return PAGE_CACHE_SIZE; 546 if (page_index == end_index) 547 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 548 } 549 return 0; 550 } 551 552 /* 553 * Convert a umode to a dirent->d_type 554 */ 555 static inline 556 unsigned char nfs_umode_to_dtype(umode_t mode) 557 { 558 return (mode >> 12) & 15; 559 } 560 561 /* 562 * Determine the number of pages in an array of length 'len' and 563 * with a base offset of 'base' 564 */ 565 static inline 566 unsigned int nfs_page_array_len(unsigned int base, size_t len) 567 { 568 return ((unsigned long)len + (unsigned long)base + 569 PAGE_SIZE - 1) >> PAGE_SHIFT; 570 } 571 572 /* 573 * Convert a struct timespec into a 64-bit change attribute 574 * 575 * This does approximately the same thing as timespec_to_ns(), 576 * but for calculation efficiency, we multiply the seconds by 577 * 1024*1024*1024. 578 */ 579 static inline 580 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 581 { 582 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 583 } 584 585 #ifdef CONFIG_CRC32 586 /** 587 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 588 * @fh - pointer to filehandle 589 * 590 * returns a crc32 hash for the filehandle that is compatible with 591 * the one displayed by "wireshark". 592 */ 593 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 594 { 595 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 596 } 597 #else 598 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 599 { 600 return 0; 601 } 602 #endif 603