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 11 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS) 12 13 struct nfs_string; 14 15 /* Maximum number of readahead requests 16 * FIXME: this should really be a sysctl so that users may tune it to suit 17 * their needs. People that do NFS over a slow network, might for 18 * instance want to reduce it to something closer to 1 for improved 19 * interactive response. 20 */ 21 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 22 23 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 24 { 25 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 26 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 27 } 28 29 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 30 { 31 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 32 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 33 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 34 return 0; 35 return 1; 36 } 37 38 struct nfs_clone_mount { 39 const struct super_block *sb; 40 const struct dentry *dentry; 41 struct nfs_fh *fh; 42 struct nfs_fattr *fattr; 43 char *hostname; 44 char *mnt_path; 45 struct sockaddr *addr; 46 size_t addrlen; 47 rpc_authflavor_t authflavor; 48 }; 49 50 /* 51 * Note: RFC 1813 doesn't limit the number of auth flavors that 52 * a server can return, so make something up. 53 */ 54 #define NFS_MAX_SECFLAVORS (12) 55 56 /* 57 * Value used if the user did not specify a port value. 58 */ 59 #define NFS_UNSPEC_PORT (-1) 60 61 /* 62 * Maximum number of pages that readdir can use for creating 63 * a vmapped array of pages. 64 */ 65 #define NFS_MAX_READDIR_PAGES 8 66 67 struct nfs_client_initdata { 68 unsigned long init_flags; 69 const char *hostname; 70 const struct sockaddr *addr; 71 size_t addrlen; 72 struct nfs_subversion *nfs_mod; 73 int proto; 74 u32 minorversion; 75 struct net *net; 76 }; 77 78 /* 79 * In-kernel mount arguments 80 */ 81 struct nfs_parsed_mount_data { 82 int flags; 83 unsigned int rsize, wsize; 84 unsigned int timeo, retrans; 85 unsigned int acregmin, acregmax, 86 acdirmin, acdirmax; 87 unsigned int namlen; 88 unsigned int options; 89 unsigned int bsize; 90 struct nfs_auth_info auth_info; 91 rpc_authflavor_t selected_flavor; 92 char *client_address; 93 unsigned int version; 94 unsigned int minorversion; 95 char *fscache_uniq; 96 bool need_mount; 97 98 struct { 99 struct sockaddr_storage address; 100 size_t addrlen; 101 char *hostname; 102 u32 version; 103 int port; 104 unsigned short protocol; 105 } mount_server; 106 107 struct { 108 struct sockaddr_storage address; 109 size_t addrlen; 110 char *hostname; 111 char *export_path; 112 int port; 113 unsigned short protocol; 114 } nfs_server; 115 116 struct security_mnt_opts lsm_opts; 117 struct net *net; 118 }; 119 120 /* mount_clnt.c */ 121 struct nfs_mount_request { 122 struct sockaddr *sap; 123 size_t salen; 124 char *hostname; 125 char *dirpath; 126 u32 version; 127 unsigned short protocol; 128 struct nfs_fh *fh; 129 int noresvport; 130 unsigned int *auth_flav_len; 131 rpc_authflavor_t *auth_flavs; 132 struct net *net; 133 }; 134 135 struct nfs_mount_info { 136 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 137 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 138 struct nfs_parsed_mount_data *parsed; 139 struct nfs_clone_mount *cloned; 140 struct nfs_fh *mntfh; 141 }; 142 143 extern int nfs_mount(struct nfs_mount_request *info); 144 extern void nfs_umount(const struct nfs_mount_request *info); 145 146 /* client.c */ 147 extern const struct rpc_program nfs_program; 148 extern void nfs_clients_init(struct net *net); 149 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 150 int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t); 151 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *, 152 const struct rpc_timeout *, const char *, 153 rpc_authflavor_t); 154 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 155 void nfs_server_insert_lists(struct nfs_server *); 156 void nfs_server_remove_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 int nfs4_update_server(struct nfs_server *server, const char *hostname, 178 struct sockaddr *sap, size_t salen, 179 struct net *net); 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 u32 minor_version, 193 rpc_authflavor_t au_flavor); 194 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 195 struct inode *); 196 extern struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp, 197 const struct sockaddr *ds_addr, int ds_addrlen, 198 int ds_proto, unsigned int ds_timeo, 199 unsigned int ds_retrans, rpc_authflavor_t au_flavor); 200 #ifdef CONFIG_PROC_FS 201 extern int __init nfs_fs_proc_init(void); 202 extern void nfs_fs_proc_exit(void); 203 extern int nfs_fs_proc_net_init(struct net *net); 204 extern void nfs_fs_proc_net_exit(struct net *net); 205 #else 206 static inline int nfs_fs_proc_net_init(struct net *net) 207 { 208 return 0; 209 } 210 static inline void nfs_fs_proc_net_exit(struct net *net) 211 { 212 } 213 static inline int nfs_fs_proc_init(void) 214 { 215 return 0; 216 } 217 static inline void nfs_fs_proc_exit(void) 218 { 219 } 220 #endif 221 222 #ifdef CONFIG_NFS_V4_1 223 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *); 224 #endif 225 226 /* callback_xdr.c */ 227 extern struct svc_version nfs4_callback_version1; 228 extern struct svc_version nfs4_callback_version4; 229 230 struct nfs_pageio_descriptor; 231 /* pagelist.c */ 232 extern int __init nfs_init_nfspagecache(void); 233 extern void nfs_destroy_nfspagecache(void); 234 extern int __init nfs_init_readpagecache(void); 235 extern void nfs_destroy_readpagecache(void); 236 extern int __init nfs_init_writepagecache(void); 237 extern void nfs_destroy_writepagecache(void); 238 239 extern int __init nfs_init_directcache(void); 240 extern void nfs_destroy_directcache(void); 241 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 242 struct nfs_pgio_header *hdr, 243 void (*release)(struct nfs_pgio_header *hdr)); 244 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 245 int nfs_iocounter_wait(struct nfs_io_counter *c); 246 247 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 248 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 249 void nfs_pgio_header_free(struct nfs_pgio_header *); 250 void nfs_pgio_data_destroy(struct nfs_pgio_header *); 251 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 252 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 253 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops, 254 const struct rpc_call_ops *call_ops, int how, int flags); 255 void nfs_free_request(struct nfs_page *req); 256 struct nfs_pgio_mirror * 257 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 258 259 static inline void nfs_iocounter_init(struct nfs_io_counter *c) 260 { 261 c->flags = 0; 262 atomic_set(&c->io_count, 0); 263 } 264 265 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc) 266 { 267 WARN_ON_ONCE(desc->pg_mirror_count < 1); 268 return desc->pg_mirror_count > 1; 269 } 270 271 /* nfs2xdr.c */ 272 extern struct rpc_procinfo nfs_procedures[]; 273 extern int nfs2_decode_dirent(struct xdr_stream *, 274 struct nfs_entry *, int); 275 276 /* nfs3xdr.c */ 277 extern struct rpc_procinfo nfs3_procedures[]; 278 extern int nfs3_decode_dirent(struct xdr_stream *, 279 struct nfs_entry *, int); 280 281 /* nfs4xdr.c */ 282 #if IS_ENABLED(CONFIG_NFS_V4) 283 extern int nfs4_decode_dirent(struct xdr_stream *, 284 struct nfs_entry *, int); 285 #endif 286 #ifdef CONFIG_NFS_V4_1 287 extern const u32 nfs41_maxread_overhead; 288 extern const u32 nfs41_maxwrite_overhead; 289 extern const u32 nfs41_maxgetdevinfo_overhead; 290 #endif 291 292 /* nfs4proc.c */ 293 #if IS_ENABLED(CONFIG_NFS_V4) 294 extern struct rpc_procinfo nfs4_procedures[]; 295 #endif 296 297 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 298 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 299 static inline void nfs4_label_free(struct nfs4_label *label) 300 { 301 if (label) { 302 kfree(label->label); 303 kfree(label); 304 } 305 return; 306 } 307 308 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 309 { 310 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 311 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 312 } 313 #else 314 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 315 static inline void nfs4_label_free(void *label) {} 316 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 317 { 318 } 319 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 320 321 /* proc.c */ 322 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 323 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 324 const struct rpc_timeout *timeparms, 325 const char *ip_addr); 326 327 /* dir.c */ 328 extern void nfs_force_use_readdirplus(struct inode *dir); 329 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 330 struct shrink_control *sc); 331 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 332 struct shrink_control *sc); 333 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 334 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 335 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 336 int nfs_rmdir(struct inode *, struct dentry *); 337 int nfs_unlink(struct inode *, struct dentry *); 338 int nfs_symlink(struct inode *, struct dentry *, const char *); 339 int nfs_link(struct dentry *, struct inode *, struct dentry *); 340 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 341 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 342 343 /* file.c */ 344 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int); 345 loff_t nfs_file_llseek(struct file *, loff_t, int); 346 int nfs_file_flush(struct file *, fl_owner_t); 347 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 348 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *, 349 size_t, unsigned int); 350 int nfs_file_mmap(struct file *, struct vm_area_struct *); 351 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 352 int nfs_file_release(struct inode *, struct file *); 353 int nfs_lock(struct file *, int, struct file_lock *); 354 int nfs_flock(struct file *, int, struct file_lock *); 355 int nfs_check_flags(int); 356 357 /* inode.c */ 358 extern struct workqueue_struct *nfsiod_workqueue; 359 extern struct inode *nfs_alloc_inode(struct super_block *sb); 360 extern void nfs_destroy_inode(struct inode *); 361 extern int nfs_write_inode(struct inode *, struct writeback_control *); 362 extern int nfs_drop_inode(struct inode *); 363 extern void nfs_clear_inode(struct inode *); 364 extern void nfs_evict_inode(struct inode *); 365 void nfs_zap_acl_cache(struct inode *inode); 366 extern int nfs_wait_bit_killable(struct wait_bit_key *key); 367 368 /* super.c */ 369 extern const struct super_operations nfs_sops; 370 extern struct file_system_type nfs_fs_type; 371 extern struct file_system_type nfs_xdev_fs_type; 372 #if IS_ENABLED(CONFIG_NFS_V4) 373 extern struct file_system_type nfs4_xdev_fs_type; 374 extern struct file_system_type nfs4_referral_fs_type; 375 #endif 376 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 377 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 378 struct nfs_subversion *); 379 void nfs_initialise_sb(struct super_block *); 380 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 381 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 382 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 383 struct nfs_mount_info *, struct nfs_subversion *); 384 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 385 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 386 const char *, struct nfs_mount_info *); 387 void nfs_kill_super(struct super_block *); 388 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 389 390 extern struct rpc_stat nfs_rpcstat; 391 392 extern int __init register_nfs_fs(void); 393 extern void __exit unregister_nfs_fs(void); 394 extern bool nfs_sb_active(struct super_block *sb); 395 extern void nfs_sb_deactive(struct super_block *sb); 396 397 /* namespace.c */ 398 #define NFS_PATH_CANONICAL 1 399 extern char *nfs_path(char **p, struct dentry *dentry, 400 char *buffer, ssize_t buflen, unsigned flags); 401 extern struct vfsmount *nfs_d_automount(struct path *path); 402 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 403 struct nfs_fh *, struct nfs_fattr *); 404 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 405 struct nfs_fattr *, rpc_authflavor_t); 406 407 /* getroot.c */ 408 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 409 const char *); 410 #if IS_ENABLED(CONFIG_NFS_V4) 411 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 412 const char *); 413 414 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 415 #endif 416 417 struct nfs_pgio_completion_ops; 418 /* read.c */ 419 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 420 struct inode *inode, bool force_mds, 421 const struct nfs_pgio_completion_ops *compl_ops); 422 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 423 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 424 425 /* super.c */ 426 void nfs_clone_super(struct super_block *, struct nfs_mount_info *); 427 void nfs_umount_begin(struct super_block *); 428 int nfs_statfs(struct dentry *, struct kstatfs *); 429 int nfs_show_options(struct seq_file *, struct dentry *); 430 int nfs_show_devname(struct seq_file *, struct dentry *); 431 int nfs_show_path(struct seq_file *, struct dentry *); 432 int nfs_show_stats(struct seq_file *, struct dentry *); 433 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 434 435 /* write.c */ 436 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 437 struct inode *inode, int ioflags, bool force_mds, 438 const struct nfs_pgio_completion_ops *compl_ops); 439 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 440 extern void nfs_commit_free(struct nfs_commit_data *p); 441 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 442 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 443 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 444 struct nfs_commit_data *data, 445 const struct nfs_rpc_ops *nfs_ops, 446 const struct rpc_call_ops *call_ops, 447 int how, int flags); 448 extern void nfs_init_commit(struct nfs_commit_data *data, 449 struct list_head *head, 450 struct pnfs_layout_segment *lseg, 451 struct nfs_commit_info *cinfo); 452 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 453 struct nfs_commit_info *cinfo, int max); 454 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 455 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 456 struct nfs_commit_info *cinfo); 457 void nfs_mark_request_commit(struct nfs_page *req, 458 struct pnfs_layout_segment *lseg, 459 struct nfs_commit_info *cinfo, 460 u32 ds_commit_idx); 461 int nfs_write_need_commit(struct nfs_pgio_header *); 462 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 463 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 464 int how, struct nfs_commit_info *cinfo); 465 void nfs_retry_commit(struct list_head *page_list, 466 struct pnfs_layout_segment *lseg, 467 struct nfs_commit_info *cinfo, 468 u32 ds_commit_idx); 469 void nfs_commitdata_release(struct nfs_commit_data *data); 470 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, 471 struct nfs_commit_info *cinfo); 472 void nfs_request_remove_commit_list(struct nfs_page *req, 473 struct nfs_commit_info *cinfo); 474 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 475 struct inode *inode, 476 struct nfs_direct_req *dreq); 477 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 478 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx); 479 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 480 481 #ifdef CONFIG_MIGRATION 482 extern int nfs_migrate_page(struct address_space *, 483 struct page *, struct page *, enum migrate_mode); 484 #else 485 #define nfs_migrate_page NULL 486 #endif 487 488 /* unlink.c */ 489 extern struct rpc_task * 490 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 491 struct dentry *old_dentry, struct dentry *new_dentry, 492 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 493 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 494 495 /* direct.c */ 496 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 497 struct nfs_direct_req *dreq); 498 static inline void nfs_inode_dio_wait(struct inode *inode) 499 { 500 inode_dio_wait(inode); 501 } 502 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 503 extern void nfs_direct_set_resched_writes(struct nfs_direct_req *dreq); 504 505 /* nfs4proc.c */ 506 extern void __nfs4_read_done_cb(struct nfs_pgio_header *); 507 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 508 const struct rpc_timeout *timeparms, 509 const char *ip_addr); 510 extern int nfs40_walk_client_list(struct nfs_client *clp, 511 struct nfs_client **result, 512 struct rpc_cred *cred); 513 extern int nfs41_walk_client_list(struct nfs_client *clp, 514 struct nfs_client **result, 515 struct rpc_cred *cred); 516 517 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 518 { 519 inode = igrab(inode); 520 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 521 iput(inode); 522 inode = NULL; 523 } 524 return inode; 525 } 526 527 static inline void nfs_iput_and_deactive(struct inode *inode) 528 { 529 if (inode != NULL) { 530 struct super_block *sb = inode->i_sb; 531 532 iput(inode); 533 nfs_sb_deactive(sb); 534 } 535 } 536 537 /* 538 * Determine the device name as a string 539 */ 540 static inline char *nfs_devname(struct dentry *dentry, 541 char *buffer, ssize_t buflen) 542 { 543 char *dummy; 544 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 545 } 546 547 /* 548 * Determine the actual block size (and log2 thereof) 549 */ 550 static inline 551 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 552 { 553 /* make sure blocksize is a power of two */ 554 if ((bsize & (bsize - 1)) || nrbitsp) { 555 unsigned char nrbits; 556 557 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 558 ; 559 bsize = 1 << nrbits; 560 if (nrbitsp) 561 *nrbitsp = nrbits; 562 } 563 564 return bsize; 565 } 566 567 /* 568 * Calculate the number of 512byte blocks used. 569 */ 570 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 571 { 572 blkcnt_t used = (tsize + 511) >> 9; 573 return (used > ULONG_MAX) ? ULONG_MAX : used; 574 } 575 576 /* 577 * Compute and set NFS server blocksize 578 */ 579 static inline 580 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 581 { 582 if (bsize < NFS_MIN_FILE_IO_SIZE) 583 bsize = NFS_DEF_FILE_IO_SIZE; 584 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 585 bsize = NFS_MAX_FILE_IO_SIZE; 586 587 return nfs_block_bits(bsize, nrbitsp); 588 } 589 590 /* 591 * Determine the maximum file size for a superblock 592 */ 593 static inline 594 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 595 { 596 sb->s_maxbytes = (loff_t)maxfilesize; 597 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 598 sb->s_maxbytes = MAX_LFS_FILESIZE; 599 } 600 601 /* 602 * Record the page as unstable and mark its inode as dirty. 603 */ 604 static inline 605 void nfs_mark_page_unstable(struct page *page) 606 { 607 struct inode *inode = page_file_mapping(page)->host; 608 609 inc_zone_page_state(page, NR_UNSTABLE_NFS); 610 inc_bdi_stat(inode_to_bdi(inode), BDI_RECLAIMABLE); 611 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 612 } 613 614 /* 615 * Determine the number of bytes of data the page contains 616 */ 617 static inline 618 unsigned int nfs_page_length(struct page *page) 619 { 620 loff_t i_size = i_size_read(page_file_mapping(page)->host); 621 622 if (i_size > 0) { 623 pgoff_t page_index = page_file_index(page); 624 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; 625 if (page_index < end_index) 626 return PAGE_CACHE_SIZE; 627 if (page_index == end_index) 628 return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1; 629 } 630 return 0; 631 } 632 633 /* 634 * Convert a umode to a dirent->d_type 635 */ 636 static inline 637 unsigned char nfs_umode_to_dtype(umode_t mode) 638 { 639 return (mode >> 12) & 15; 640 } 641 642 /* 643 * Determine the number of pages in an array of length 'len' and 644 * with a base offset of 'base' 645 */ 646 static inline 647 unsigned int nfs_page_array_len(unsigned int base, size_t len) 648 { 649 return ((unsigned long)len + (unsigned long)base + 650 PAGE_SIZE - 1) >> PAGE_SHIFT; 651 } 652 653 /* 654 * Convert a struct timespec into a 64-bit change attribute 655 * 656 * This does approximately the same thing as timespec_to_ns(), 657 * but for calculation efficiency, we multiply the seconds by 658 * 1024*1024*1024. 659 */ 660 static inline 661 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 662 { 663 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 664 } 665 666 #ifdef CONFIG_CRC32 667 /** 668 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 669 * @fh - pointer to filehandle 670 * 671 * returns a crc32 hash for the filehandle that is compatible with 672 * the one displayed by "wireshark". 673 */ 674 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 675 { 676 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 677 } 678 #else 679 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 680 { 681 return 0; 682 } 683 #endif 684