1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * NFS internal definitions 4 */ 5 6 #include "nfs4_fs.h" 7 #include <linux/mount.h> 8 #include <linux/security.h> 9 #include <linux/crc32.h> 10 #include <linux/nfs_page.h> 11 #include <linux/wait_bit.h> 12 13 #define NFS_MS_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS) 14 15 extern const struct export_operations nfs_export_ops; 16 17 struct nfs_string; 18 19 /* Maximum number of readahead requests 20 * FIXME: this should really be a sysctl so that users may tune it to suit 21 * their needs. People that do NFS over a slow network, might for 22 * instance want to reduce it to something closer to 1 for improved 23 * interactive response. 24 */ 25 #define NFS_MAX_READAHEAD (RPC_DEF_SLOT_TABLE - 1) 26 27 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 28 { 29 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 30 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 31 } 32 33 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 34 { 35 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 36 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 37 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 38 return 0; 39 return 1; 40 } 41 42 struct nfs_clone_mount { 43 const struct super_block *sb; 44 const struct dentry *dentry; 45 struct nfs_fh *fh; 46 struct nfs_fattr *fattr; 47 char *hostname; 48 char *mnt_path; 49 struct sockaddr *addr; 50 size_t addrlen; 51 rpc_authflavor_t authflavor; 52 }; 53 54 /* 55 * Note: RFC 1813 doesn't limit the number of auth flavors that 56 * a server can return, so make something up. 57 */ 58 #define NFS_MAX_SECFLAVORS (12) 59 60 /* 61 * Value used if the user did not specify a port value. 62 */ 63 #define NFS_UNSPEC_PORT (-1) 64 65 #define NFS_UNSPEC_RETRANS (UINT_MAX) 66 #define NFS_UNSPEC_TIMEO (UINT_MAX) 67 68 /* 69 * Maximum number of pages that readdir can use for creating 70 * a vmapped array of pages. 71 */ 72 #define NFS_MAX_READDIR_PAGES 64 73 #define NFS_MAX_READDIR_RAPAGES 8 74 75 struct nfs_client_initdata { 76 unsigned long init_flags; 77 const char *hostname; /* Hostname of the server */ 78 const struct sockaddr *addr; /* Address of the server */ 79 const char *nodename; /* Hostname of the client */ 80 const char *ip_addr; /* IP address of the client */ 81 size_t addrlen; 82 struct nfs_subversion *nfs_mod; 83 int proto; 84 u32 minorversion; 85 struct net *net; 86 const struct rpc_timeout *timeparms; 87 const struct cred *cred; 88 }; 89 90 /* 91 * In-kernel mount arguments 92 */ 93 struct nfs_parsed_mount_data { 94 int flags; 95 unsigned int rsize, wsize; 96 unsigned int timeo, retrans; 97 unsigned int acregmin, acregmax, 98 acdirmin, acdirmax; 99 unsigned int namlen; 100 unsigned int options; 101 unsigned int bsize; 102 struct nfs_auth_info auth_info; 103 rpc_authflavor_t selected_flavor; 104 char *client_address; 105 unsigned int version; 106 unsigned int minorversion; 107 char *fscache_uniq; 108 bool need_mount; 109 110 struct { 111 struct sockaddr_storage address; 112 size_t addrlen; 113 char *hostname; 114 u32 version; 115 int port; 116 unsigned short protocol; 117 } mount_server; 118 119 struct { 120 struct sockaddr_storage address; 121 size_t addrlen; 122 char *hostname; 123 char *export_path; 124 int port; 125 unsigned short protocol; 126 } nfs_server; 127 128 void *lsm_opts; 129 struct net *net; 130 }; 131 132 /* mount_clnt.c */ 133 struct nfs_mount_request { 134 struct sockaddr *sap; 135 size_t salen; 136 char *hostname; 137 char *dirpath; 138 u32 version; 139 unsigned short protocol; 140 struct nfs_fh *fh; 141 int noresvport; 142 unsigned int *auth_flav_len; 143 rpc_authflavor_t *auth_flavs; 144 struct net *net; 145 }; 146 147 struct nfs_mount_info { 148 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 149 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 150 struct nfs_parsed_mount_data *parsed; 151 struct nfs_clone_mount *cloned; 152 struct nfs_fh *mntfh; 153 }; 154 155 extern int nfs_mount(struct nfs_mount_request *info); 156 extern void nfs_umount(const struct nfs_mount_request *info); 157 158 /* client.c */ 159 extern const struct rpc_program nfs_program; 160 extern void nfs_clients_init(struct net *net); 161 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 162 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 163 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 164 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 165 void nfs_server_insert_lists(struct nfs_server *); 166 void nfs_server_remove_lists(struct nfs_server *); 167 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 168 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 169 rpc_authflavor_t); 170 struct nfs_server *nfs_alloc_server(void); 171 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 172 173 extern void nfs_cleanup_cb_ident_idr(struct net *); 174 extern void nfs_put_client(struct nfs_client *); 175 extern void nfs_free_client(struct nfs_client *); 176 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 177 extern struct nfs_client * 178 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 179 struct nfs4_sessionid *, u32); 180 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 181 struct nfs_subversion *); 182 extern struct nfs_server *nfs4_create_server( 183 struct nfs_mount_info *, 184 struct nfs_subversion *); 185 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 186 struct nfs_fh *); 187 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 188 struct sockaddr *sap, size_t salen, 189 struct net *net); 190 extern void nfs_free_server(struct nfs_server *server); 191 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 192 struct nfs_fh *, 193 struct nfs_fattr *, 194 rpc_authflavor_t); 195 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 196 extern int nfs_client_init_status(const struct nfs_client *clp); 197 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 198 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 199 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 200 const struct sockaddr *ds_addr, 201 int ds_addrlen, int ds_proto, 202 unsigned int ds_timeo, 203 unsigned int ds_retrans, 204 u32 minor_version); 205 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 206 struct inode *); 207 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 208 const struct sockaddr *ds_addr, int ds_addrlen, 209 int ds_proto, unsigned int ds_timeo, 210 unsigned int ds_retrans); 211 #ifdef CONFIG_PROC_FS 212 extern int __init nfs_fs_proc_init(void); 213 extern void nfs_fs_proc_exit(void); 214 extern int nfs_fs_proc_net_init(struct net *net); 215 extern void nfs_fs_proc_net_exit(struct net *net); 216 #else 217 static inline int nfs_fs_proc_net_init(struct net *net) 218 { 219 return 0; 220 } 221 static inline void nfs_fs_proc_net_exit(struct net *net) 222 { 223 } 224 static inline int nfs_fs_proc_init(void) 225 { 226 return 0; 227 } 228 static inline void nfs_fs_proc_exit(void) 229 { 230 } 231 #endif 232 233 /* callback_xdr.c */ 234 extern const struct svc_version nfs4_callback_version1; 235 extern const struct svc_version nfs4_callback_version4; 236 237 struct nfs_pageio_descriptor; 238 /* pagelist.c */ 239 extern int __init nfs_init_nfspagecache(void); 240 extern void nfs_destroy_nfspagecache(void); 241 extern int __init nfs_init_readpagecache(void); 242 extern void nfs_destroy_readpagecache(void); 243 extern int __init nfs_init_writepagecache(void); 244 extern void nfs_destroy_writepagecache(void); 245 246 extern int __init nfs_init_directcache(void); 247 extern void nfs_destroy_directcache(void); 248 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 249 struct nfs_pgio_header *hdr, 250 void (*release)(struct nfs_pgio_header *hdr)); 251 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 252 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 253 254 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 255 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 256 void nfs_pgio_header_free(struct nfs_pgio_header *); 257 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 258 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 259 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, 260 const struct rpc_call_ops *call_ops, int how, int flags); 261 void nfs_free_request(struct nfs_page *req); 262 struct nfs_pgio_mirror * 263 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 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 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 272 const struct nfs_open_context *ctx2) 273 { 274 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; 275 } 276 277 /* nfs2xdr.c */ 278 extern const struct rpc_procinfo nfs_procedures[]; 279 extern int nfs2_decode_dirent(struct xdr_stream *, 280 struct nfs_entry *, bool); 281 282 /* nfs3xdr.c */ 283 extern const struct rpc_procinfo nfs3_procedures[]; 284 extern int nfs3_decode_dirent(struct xdr_stream *, 285 struct nfs_entry *, bool); 286 287 /* nfs4xdr.c */ 288 #if IS_ENABLED(CONFIG_NFS_V4) 289 extern int nfs4_decode_dirent(struct xdr_stream *, 290 struct nfs_entry *, bool); 291 #endif 292 #ifdef CONFIG_NFS_V4_1 293 extern const u32 nfs41_maxread_overhead; 294 extern const u32 nfs41_maxwrite_overhead; 295 extern const u32 nfs41_maxgetdevinfo_overhead; 296 #endif 297 298 /* nfs4proc.c */ 299 #if IS_ENABLED(CONFIG_NFS_V4) 300 extern const struct rpc_procinfo nfs4_procedures[]; 301 #endif 302 303 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 304 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 305 static inline struct nfs4_label * 306 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 307 { 308 if (!dst || !src) 309 return NULL; 310 311 if (src->len > NFS4_MAXLABELLEN) 312 return NULL; 313 314 dst->lfs = src->lfs; 315 dst->pi = src->pi; 316 dst->len = src->len; 317 memcpy(dst->label, src->label, src->len); 318 319 return dst; 320 } 321 static inline void nfs4_label_free(struct nfs4_label *label) 322 { 323 if (label) { 324 kfree(label->label); 325 kfree(label); 326 } 327 return; 328 } 329 330 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 331 { 332 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 333 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 334 } 335 #else 336 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 337 static inline void nfs4_label_free(void *label) {} 338 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 339 { 340 } 341 static inline struct nfs4_label * 342 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 343 { 344 return NULL; 345 } 346 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 347 348 /* proc.c */ 349 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 350 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 351 const struct nfs_client_initdata *); 352 353 /* dir.c */ 354 extern void nfs_advise_use_readdirplus(struct inode *dir); 355 extern void nfs_force_use_readdirplus(struct inode *dir); 356 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 357 struct shrink_control *sc); 358 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 359 struct shrink_control *sc); 360 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 361 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 362 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 363 int nfs_rmdir(struct inode *, struct dentry *); 364 int nfs_unlink(struct inode *, struct dentry *); 365 int nfs_symlink(struct inode *, struct dentry *, const char *); 366 int nfs_link(struct dentry *, struct inode *, struct dentry *); 367 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 368 int nfs_rename(struct inode *, struct dentry *, 369 struct inode *, struct dentry *, unsigned int); 370 371 /* file.c */ 372 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 373 loff_t nfs_file_llseek(struct file *, loff_t, int); 374 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 375 int nfs_file_mmap(struct file *, struct vm_area_struct *); 376 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 377 int nfs_file_release(struct inode *, struct file *); 378 int nfs_lock(struct file *, int, struct file_lock *); 379 int nfs_flock(struct file *, int, struct file_lock *); 380 int nfs_check_flags(int); 381 382 /* inode.c */ 383 extern struct workqueue_struct *nfsiod_workqueue; 384 extern struct inode *nfs_alloc_inode(struct super_block *sb); 385 extern void nfs_free_inode(struct inode *); 386 extern int nfs_write_inode(struct inode *, struct writeback_control *); 387 extern int nfs_drop_inode(struct inode *); 388 extern void nfs_clear_inode(struct inode *); 389 extern void nfs_evict_inode(struct inode *); 390 void nfs_zap_acl_cache(struct inode *inode); 391 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 392 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 393 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); 394 395 /* super.c */ 396 extern const struct super_operations nfs_sops; 397 extern struct file_system_type nfs_fs_type; 398 extern struct file_system_type nfs_xdev_fs_type; 399 #if IS_ENABLED(CONFIG_NFS_V4) 400 extern struct file_system_type nfs4_referral_fs_type; 401 #endif 402 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 403 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 404 struct nfs_subversion *); 405 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 406 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 407 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 408 struct nfs_mount_info *, struct nfs_subversion *); 409 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 410 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 411 const char *, struct nfs_mount_info *); 412 void nfs_kill_super(struct super_block *); 413 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 414 415 extern struct rpc_stat nfs_rpcstat; 416 417 extern int __init register_nfs_fs(void); 418 extern void __exit unregister_nfs_fs(void); 419 extern bool nfs_sb_active(struct super_block *sb); 420 extern void nfs_sb_deactive(struct super_block *sb); 421 422 /* io.c */ 423 extern void nfs_start_io_read(struct inode *inode); 424 extern void nfs_end_io_read(struct inode *inode); 425 extern void nfs_start_io_write(struct inode *inode); 426 extern void nfs_end_io_write(struct inode *inode); 427 extern void nfs_start_io_direct(struct inode *inode); 428 extern void nfs_end_io_direct(struct inode *inode); 429 430 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 431 { 432 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 433 } 434 435 /* namespace.c */ 436 #define NFS_PATH_CANONICAL 1 437 extern char *nfs_path(char **p, struct dentry *dentry, 438 char *buffer, ssize_t buflen, unsigned flags); 439 extern struct vfsmount *nfs_d_automount(struct path *path); 440 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 441 struct nfs_fh *, struct nfs_fattr *); 442 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 443 struct nfs_fattr *, rpc_authflavor_t); 444 445 /* getroot.c */ 446 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 447 const char *); 448 #if IS_ENABLED(CONFIG_NFS_V4) 449 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 450 const char *); 451 452 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 453 #endif 454 455 struct nfs_pgio_completion_ops; 456 /* read.c */ 457 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 458 struct inode *inode, bool force_mds, 459 const struct nfs_pgio_completion_ops *compl_ops); 460 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 461 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 462 463 /* super.c */ 464 void nfs_umount_begin(struct super_block *); 465 int nfs_statfs(struct dentry *, struct kstatfs *); 466 int nfs_show_options(struct seq_file *, struct dentry *); 467 int nfs_show_devname(struct seq_file *, struct dentry *); 468 int nfs_show_path(struct seq_file *, struct dentry *); 469 int nfs_show_stats(struct seq_file *, struct dentry *); 470 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 471 472 /* write.c */ 473 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 474 struct inode *inode, int ioflags, bool force_mds, 475 const struct nfs_pgio_completion_ops *compl_ops); 476 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 477 extern void nfs_commit_free(struct nfs_commit_data *p); 478 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 479 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 480 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 481 struct nfs_commit_data *data, 482 const struct nfs_rpc_ops *nfs_ops, 483 const struct rpc_call_ops *call_ops, 484 int how, int flags); 485 extern void nfs_init_commit(struct nfs_commit_data *data, 486 struct list_head *head, 487 struct pnfs_layout_segment *lseg, 488 struct nfs_commit_info *cinfo); 489 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 490 struct nfs_commit_info *cinfo, int max); 491 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 492 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 493 struct nfs_commit_info *cinfo); 494 void nfs_mark_request_commit(struct nfs_page *req, 495 struct pnfs_layout_segment *lseg, 496 struct nfs_commit_info *cinfo, 497 u32 ds_commit_idx); 498 int nfs_write_need_commit(struct nfs_pgio_header *); 499 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 500 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 501 int how, struct nfs_commit_info *cinfo); 502 void nfs_retry_commit(struct list_head *page_list, 503 struct pnfs_layout_segment *lseg, 504 struct nfs_commit_info *cinfo, 505 u32 ds_commit_idx); 506 void nfs_commitdata_release(struct nfs_commit_data *data); 507 void nfs_request_add_commit_list(struct nfs_page *req, 508 struct nfs_commit_info *cinfo); 509 void nfs_request_add_commit_list_locked(struct nfs_page *req, 510 struct list_head *dst, 511 struct nfs_commit_info *cinfo); 512 void nfs_request_remove_commit_list(struct nfs_page *req, 513 struct nfs_commit_info *cinfo); 514 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 515 struct inode *inode, 516 struct nfs_direct_req *dreq); 517 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 518 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 519 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 520 521 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 522 loff_t lstart, loff_t lend); 523 524 #ifdef CONFIG_NFS_V4_1 525 static inline 526 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 527 { 528 int i; 529 530 for (i = 0; i < cinfo->nbuckets; i++) 531 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 532 } 533 #else 534 static inline 535 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 536 { 537 } 538 #endif 539 540 #ifdef CONFIG_MIGRATION 541 extern int nfs_migrate_page(struct address_space *, 542 struct page *, struct page *, enum migrate_mode); 543 #endif 544 545 static inline int 546 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 547 const struct nfs_write_verifier *v2) 548 { 549 return memcmp(v1->data, v2->data, sizeof(v1->data)); 550 } 551 552 /* unlink.c */ 553 extern struct rpc_task * 554 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 555 struct dentry *old_dentry, struct dentry *new_dentry, 556 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 557 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 558 559 /* direct.c */ 560 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 561 struct nfs_direct_req *dreq); 562 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 563 564 /* nfs4proc.c */ 565 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 566 const struct nfs_client_initdata *); 567 extern int nfs40_walk_client_list(struct nfs_client *clp, 568 struct nfs_client **result, 569 const struct cred *cred); 570 extern int nfs41_walk_client_list(struct nfs_client *clp, 571 struct nfs_client **result, 572 const struct cred *cred); 573 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, 574 struct rpc_xprt *xprt, 575 void *data); 576 577 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 578 { 579 inode = igrab(inode); 580 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 581 iput(inode); 582 inode = NULL; 583 } 584 return inode; 585 } 586 587 static inline void nfs_iput_and_deactive(struct inode *inode) 588 { 589 if (inode != NULL) { 590 struct super_block *sb = inode->i_sb; 591 592 iput(inode); 593 nfs_sb_deactive(sb); 594 } 595 } 596 597 /* 598 * Determine the device name as a string 599 */ 600 static inline char *nfs_devname(struct dentry *dentry, 601 char *buffer, ssize_t buflen) 602 { 603 char *dummy; 604 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 605 } 606 607 /* 608 * Determine the actual block size (and log2 thereof) 609 */ 610 static inline 611 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 612 { 613 /* make sure blocksize is a power of two */ 614 if ((bsize & (bsize - 1)) || nrbitsp) { 615 unsigned char nrbits; 616 617 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 618 ; 619 bsize = 1 << nrbits; 620 if (nrbitsp) 621 *nrbitsp = nrbits; 622 } 623 624 return bsize; 625 } 626 627 /* 628 * Calculate the number of 512byte blocks used. 629 */ 630 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 631 { 632 blkcnt_t used = (tsize + 511) >> 9; 633 return (used > ULONG_MAX) ? ULONG_MAX : used; 634 } 635 636 /* 637 * Compute and set NFS server blocksize 638 */ 639 static inline 640 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 641 { 642 if (bsize < NFS_MIN_FILE_IO_SIZE) 643 bsize = NFS_DEF_FILE_IO_SIZE; 644 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 645 bsize = NFS_MAX_FILE_IO_SIZE; 646 647 return nfs_block_bits(bsize, nrbitsp); 648 } 649 650 /* 651 * Determine the maximum file size for a superblock 652 */ 653 static inline 654 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 655 { 656 sb->s_maxbytes = (loff_t)maxfilesize; 657 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 658 sb->s_maxbytes = MAX_LFS_FILESIZE; 659 } 660 661 /* 662 * Record the page as unstable and mark its inode as dirty. 663 */ 664 static inline 665 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) 666 { 667 if (!cinfo->dreq) { 668 struct inode *inode = page_file_mapping(page)->host; 669 670 inc_node_page_state(page, NR_UNSTABLE_NFS); 671 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE); 672 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 673 } 674 } 675 676 /* 677 * Determine the number of bytes of data the page contains 678 */ 679 static inline 680 unsigned int nfs_page_length(struct page *page) 681 { 682 loff_t i_size = i_size_read(page_file_mapping(page)->host); 683 684 if (i_size > 0) { 685 pgoff_t index = page_index(page); 686 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 687 if (index < end_index) 688 return PAGE_SIZE; 689 if (index == end_index) 690 return ((i_size - 1) & ~PAGE_MASK) + 1; 691 } 692 return 0; 693 } 694 695 /* 696 * Convert a umode to a dirent->d_type 697 */ 698 static inline 699 unsigned char nfs_umode_to_dtype(umode_t mode) 700 { 701 return (mode >> 12) & 15; 702 } 703 704 /* 705 * Determine the number of pages in an array of length 'len' and 706 * with a base offset of 'base' 707 */ 708 static inline 709 unsigned int nfs_page_array_len(unsigned int base, size_t len) 710 { 711 return ((unsigned long)len + (unsigned long)base + 712 PAGE_SIZE - 1) >> PAGE_SHIFT; 713 } 714 715 /* 716 * Convert a struct timespec into a 64-bit change attribute 717 * 718 * This does approximately the same thing as timespec_to_ns(), 719 * but for calculation efficiency, we multiply the seconds by 720 * 1024*1024*1024. 721 */ 722 static inline 723 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 724 { 725 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 726 } 727 728 #ifdef CONFIG_CRC32 729 /** 730 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 731 * @fh - pointer to filehandle 732 * 733 * returns a crc32 hash for the filehandle that is compatible with 734 * the one displayed by "wireshark". 735 */ 736 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 737 { 738 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 739 } 740 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 741 { 742 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 743 NFS4_STATEID_OTHER_SIZE); 744 } 745 #else 746 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 747 { 748 return 0; 749 } 750 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 751 { 752 return 0; 753 } 754 #endif 755 756 static inline bool nfs_error_is_fatal(int err) 757 { 758 switch (err) { 759 case -ERESTARTSYS: 760 case -EINTR: 761 case -EACCES: 762 case -EDQUOT: 763 case -EFBIG: 764 case -EIO: 765 case -ENOSPC: 766 case -EROFS: 767 case -ESTALE: 768 case -E2BIG: 769 case -ENOMEM: 770 case -ETIMEDOUT: 771 return true; 772 default: 773 return false; 774 } 775 } 776 777