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 extern void nfs_free_server(struct nfs_server *server); 181 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 182 struct nfs_fh *, 183 struct nfs_fattr *, 184 rpc_authflavor_t); 185 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 186 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 187 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 188 const struct sockaddr *ds_addr, 189 int ds_addrlen, int ds_proto, 190 unsigned int ds_timeo, 191 unsigned int ds_retrans); 192 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 193 struct inode *); 194 #ifdef CONFIG_PROC_FS 195 extern int __init nfs_fs_proc_init(void); 196 extern void nfs_fs_proc_exit(void); 197 #else 198 static inline int nfs_fs_proc_init(void) 199 { 200 return 0; 201 } 202 static inline void nfs_fs_proc_exit(void) 203 { 204 } 205 #endif 206 207 #ifdef CONFIG_NFS_V4_1 208 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *); 209 #endif 210 211 /* nfs3client.c */ 212 #if IS_ENABLED(CONFIG_NFS_V3) 213 struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *); 214 struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *, 215 struct nfs_fattr *, rpc_authflavor_t); 216 #endif 217 218 /* callback_xdr.c */ 219 extern struct svc_version nfs4_callback_version1; 220 extern struct svc_version nfs4_callback_version4; 221 222 struct nfs_pageio_descriptor; 223 /* pagelist.c */ 224 extern int __init nfs_init_nfspagecache(void); 225 extern void nfs_destroy_nfspagecache(void); 226 extern int __init nfs_init_readpagecache(void); 227 extern void nfs_destroy_readpagecache(void); 228 extern int __init nfs_init_writepagecache(void); 229 extern void nfs_destroy_writepagecache(void); 230 231 extern int __init nfs_init_directcache(void); 232 extern void nfs_destroy_directcache(void); 233 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount); 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 static inline void nfs_iocounter_init(struct nfs_io_counter *c) 241 { 242 c->flags = 0; 243 atomic_set(&c->io_count, 0); 244 } 245 246 /* nfs2xdr.c */ 247 extern struct rpc_procinfo nfs_procedures[]; 248 extern int nfs2_decode_dirent(struct xdr_stream *, 249 struct nfs_entry *, int); 250 251 /* nfs3xdr.c */ 252 extern struct rpc_procinfo nfs3_procedures[]; 253 extern int nfs3_decode_dirent(struct xdr_stream *, 254 struct nfs_entry *, int); 255 256 /* nfs4xdr.c */ 257 #if IS_ENABLED(CONFIG_NFS_V4) 258 extern int nfs4_decode_dirent(struct xdr_stream *, 259 struct nfs_entry *, int); 260 #endif 261 #ifdef CONFIG_NFS_V4_1 262 extern const u32 nfs41_maxread_overhead; 263 extern const u32 nfs41_maxwrite_overhead; 264 extern const u32 nfs41_maxgetdevinfo_overhead; 265 #endif 266 267 /* nfs4proc.c */ 268 #if IS_ENABLED(CONFIG_NFS_V4) 269 extern struct rpc_procinfo nfs4_procedures[]; 270 #endif 271 272 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 273 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 274 static inline void nfs4_label_free(struct nfs4_label *label) 275 { 276 if (label) { 277 kfree(label->label); 278 kfree(label); 279 } 280 return; 281 } 282 #else 283 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 284 static inline void nfs4_label_free(void *label) {} 285 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 286 287 /* proc.c */ 288 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 289 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 290 const struct rpc_timeout *timeparms, 291 const char *ip_addr); 292 293 /* dir.c */ 294 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 295 struct shrink_control *sc); 296 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 297 struct shrink_control *sc); 298 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 299 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 300 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 301 int nfs_rmdir(struct inode *, struct dentry *); 302 int nfs_unlink(struct inode *, struct dentry *); 303 int nfs_symlink(struct inode *, struct dentry *, const char *); 304 int nfs_link(struct dentry *, struct inode *, struct dentry *); 305 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 306 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 307 308 /* file.c */ 309 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int); 310 loff_t nfs_file_llseek(struct file *, loff_t, int); 311 int nfs_file_flush(struct file *, fl_owner_t); 312 ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t); 313 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, 314 size_t, unsigned int); 315 int nfs_file_mmap(struct file *, struct vm_area_struct *); 316 ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t); 317 int nfs_file_release(struct inode *, struct file *); 318 int nfs_lock(struct file *, int, struct file_lock *); 319 int nfs_flock(struct file *, int, struct file_lock *); 320 ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *, 321 size_t, unsigned int); 322 int nfs_check_flags(int); 323 int nfs_setlease(struct file *, long, struct file_lock **); 324 325 /* inode.c */ 326 extern struct workqueue_struct *nfsiod_workqueue; 327 extern struct inode *nfs_alloc_inode(struct super_block *sb); 328 extern void nfs_destroy_inode(struct inode *); 329 extern int nfs_write_inode(struct inode *, struct writeback_control *); 330 extern int nfs_drop_inode(struct inode *); 331 extern void nfs_clear_inode(struct inode *); 332 extern void nfs_evict_inode(struct inode *); 333 void nfs_zap_acl_cache(struct inode *inode); 334 extern int nfs_wait_bit_killable(void *word); 335 336 /* super.c */ 337 extern const struct super_operations nfs_sops; 338 extern struct file_system_type nfs_fs_type; 339 extern struct file_system_type nfs_xdev_fs_type; 340 #if IS_ENABLED(CONFIG_NFS_V4) 341 extern struct file_system_type nfs4_xdev_fs_type; 342 extern struct file_system_type nfs4_referral_fs_type; 343 #endif 344 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 345 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 346 struct nfs_subversion *); 347 void nfs_initialise_sb(struct super_block *); 348 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 349 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 350 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 351 struct nfs_mount_info *, struct nfs_subversion *); 352 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 353 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 354 const char *, struct nfs_mount_info *); 355 void nfs_kill_super(struct super_block *); 356 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 357 358 extern struct rpc_stat nfs_rpcstat; 359 360 extern int __init register_nfs_fs(void); 361 extern void __exit unregister_nfs_fs(void); 362 extern void nfs_sb_active(struct super_block *sb); 363 extern void nfs_sb_deactive(struct super_block *sb); 364 365 /* namespace.c */ 366 #define NFS_PATH_CANONICAL 1 367 extern char *nfs_path(char **p, struct dentry *dentry, 368 char *buffer, ssize_t buflen, unsigned flags); 369 extern struct vfsmount *nfs_d_automount(struct path *path); 370 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 371 struct nfs_fh *, struct nfs_fattr *); 372 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 373 struct nfs_fattr *, rpc_authflavor_t); 374 375 /* getroot.c */ 376 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 377 const char *); 378 #if IS_ENABLED(CONFIG_NFS_V4) 379 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 380 const char *); 381 382 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 383 #endif 384 385 struct nfs_pgio_completion_ops; 386 /* read.c */ 387 extern struct nfs_read_header *nfs_readhdr_alloc(void); 388 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr); 389 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 390 struct inode *inode, 391 const struct nfs_pgio_completion_ops *compl_ops); 392 extern int nfs_initiate_read(struct rpc_clnt *clnt, 393 struct nfs_read_data *data, 394 const struct rpc_call_ops *call_ops, int flags); 395 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 396 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc, 397 struct nfs_pgio_header *hdr); 398 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 399 extern void nfs_readdata_release(struct nfs_read_data *rdata); 400 401 /* super.c */ 402 void nfs_clone_super(struct super_block *, struct nfs_mount_info *); 403 void nfs_umount_begin(struct super_block *); 404 int nfs_statfs(struct dentry *, struct kstatfs *); 405 int nfs_show_options(struct seq_file *, struct dentry *); 406 int nfs_show_devname(struct seq_file *, struct dentry *); 407 int nfs_show_path(struct seq_file *, struct dentry *); 408 int nfs_show_stats(struct seq_file *, struct dentry *); 409 void nfs_put_super(struct super_block *); 410 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 411 412 /* write.c */ 413 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 414 struct inode *inode, int ioflags, 415 const struct nfs_pgio_completion_ops *compl_ops); 416 extern struct nfs_write_header *nfs_writehdr_alloc(void); 417 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr); 418 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc, 419 struct nfs_pgio_header *hdr); 420 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 421 extern void nfs_writedata_release(struct nfs_write_data *wdata); 422 extern void nfs_commit_free(struct nfs_commit_data *p); 423 extern int nfs_initiate_write(struct rpc_clnt *clnt, 424 struct nfs_write_data *data, 425 const struct rpc_call_ops *call_ops, 426 int how, int flags); 427 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 428 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 429 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 430 struct nfs_commit_data *data, 431 const struct rpc_call_ops *call_ops, 432 int how, int flags); 433 extern void nfs_init_commit(struct nfs_commit_data *data, 434 struct list_head *head, 435 struct pnfs_layout_segment *lseg, 436 struct nfs_commit_info *cinfo); 437 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 438 struct nfs_commit_info *cinfo, int max); 439 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 440 struct nfs_commit_info *cinfo); 441 void nfs_mark_request_commit(struct nfs_page *req, 442 struct pnfs_layout_segment *lseg, 443 struct nfs_commit_info *cinfo); 444 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 445 int how, struct nfs_commit_info *cinfo); 446 void nfs_retry_commit(struct list_head *page_list, 447 struct pnfs_layout_segment *lseg, 448 struct nfs_commit_info *cinfo); 449 void nfs_commitdata_release(struct nfs_commit_data *data); 450 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 451 struct nfs_commit_info *cinfo); 452 void nfs_request_remove_commit_list(struct nfs_page *req, 453 struct nfs_commit_info *cinfo); 454 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 455 struct inode *inode, 456 struct nfs_direct_req *dreq); 457 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 458 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx); 459 460 #ifdef CONFIG_MIGRATION 461 extern int nfs_migrate_page(struct address_space *, 462 struct page *, struct page *, enum migrate_mode); 463 #else 464 #define nfs_migrate_page NULL 465 #endif 466 467 /* direct.c */ 468 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 469 struct nfs_direct_req *dreq); 470 static inline void nfs_inode_dio_wait(struct inode *inode) 471 { 472 inode_dio_wait(inode); 473 } 474 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 475 476 /* nfs4proc.c */ 477 extern void __nfs4_read_done_cb(struct nfs_read_data *); 478 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 479 const struct rpc_timeout *timeparms, 480 const char *ip_addr); 481 extern int nfs40_walk_client_list(struct nfs_client *clp, 482 struct nfs_client **result, 483 struct rpc_cred *cred); 484 extern int nfs41_walk_client_list(struct nfs_client *clp, 485 struct nfs_client **result, 486 struct rpc_cred *cred); 487 488 /* 489 * Determine the device name as a string 490 */ 491 static inline char *nfs_devname(struct dentry *dentry, 492 char *buffer, ssize_t buflen) 493 { 494 char *dummy; 495 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 496 } 497 498 /* 499 * Determine the actual block size (and log2 thereof) 500 */ 501 static inline 502 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 503 { 504 /* make sure blocksize is a power of two */ 505 if ((bsize & (bsize - 1)) || nrbitsp) { 506 unsigned char nrbits; 507 508 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 509 ; 510 bsize = 1 << nrbits; 511 if (nrbitsp) 512 *nrbitsp = nrbits; 513 } 514 515 return bsize; 516 } 517 518 /* 519 * Calculate the number of 512byte blocks used. 520 */ 521 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 522 { 523 blkcnt_t used = (tsize + 511) >> 9; 524 return (used > ULONG_MAX) ? ULONG_MAX : used; 525 } 526 527 /* 528 * Compute and set NFS server blocksize 529 */ 530 static inline 531 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 532 { 533 if (bsize < NFS_MIN_FILE_IO_SIZE) 534 bsize = NFS_DEF_FILE_IO_SIZE; 535 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 536 bsize = NFS_MAX_FILE_IO_SIZE; 537 538 return nfs_block_bits(bsize, nrbitsp); 539 } 540 541 /* 542 * Determine the maximum file size for a superblock 543 */ 544 static inline 545 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 546 { 547 sb->s_maxbytes = (loff_t)maxfilesize; 548 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 549 sb->s_maxbytes = MAX_LFS_FILESIZE; 550 } 551 552 /* 553 * Determine the number of bytes of data the page contains 554 */ 555 static inline 556 unsigned int nfs_page_length(struct page *page) 557 { 558 loff_t i_size = i_size_read(page_file_mapping(page)->host); 559 560 if (i_size > 0) { 561 pgoff_t page_index = page_file_index(page); 562 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 563 if (page_index < end_index) 564 return PAGE_CACHE_SIZE; 565 if (page_index == end_index) 566 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 567 } 568 return 0; 569 } 570 571 /* 572 * Convert a umode to a dirent->d_type 573 */ 574 static inline 575 unsigned char nfs_umode_to_dtype(umode_t mode) 576 { 577 return (mode >> 12) & 15; 578 } 579 580 /* 581 * Determine the number of pages in an array of length 'len' and 582 * with a base offset of 'base' 583 */ 584 static inline 585 unsigned int nfs_page_array_len(unsigned int base, size_t len) 586 { 587 return ((unsigned long)len + (unsigned long)base + 588 PAGE_SIZE - 1) >> PAGE_SHIFT; 589 } 590 591 /* 592 * Convert a struct timespec into a 64-bit change attribute 593 * 594 * This does approximately the same thing as timespec_to_ns(), 595 * but for calculation efficiency, we multiply the seconds by 596 * 1024*1024*1024. 597 */ 598 static inline 599 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 600 { 601 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 602 } 603 604 #ifdef CONFIG_CRC32 605 /** 606 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 607 * @fh - pointer to filehandle 608 * 609 * returns a crc32 hash for the filehandle that is compatible with 610 * the one displayed by "wireshark". 611 */ 612 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 613 { 614 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 615 } 616 #else 617 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 618 { 619 return 0; 620 } 621 #endif 622