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 8 73 74 struct nfs_client_initdata { 75 unsigned long init_flags; 76 const char *hostname; /* Hostname of the server */ 77 const struct sockaddr *addr; /* Address of the server */ 78 const char *nodename; /* Hostname of the client */ 79 const char *ip_addr; /* IP address of the client */ 80 size_t addrlen; 81 struct nfs_subversion *nfs_mod; 82 int proto; 83 u32 minorversion; 84 unsigned int nconnect; 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 unsigned short nconnect; 127 } nfs_server; 128 129 void *lsm_opts; 130 struct net *net; 131 }; 132 133 /* mount_clnt.c */ 134 struct nfs_mount_request { 135 struct sockaddr *sap; 136 size_t salen; 137 char *hostname; 138 char *dirpath; 139 u32 version; 140 unsigned short protocol; 141 struct nfs_fh *fh; 142 int noresvport; 143 unsigned int *auth_flav_len; 144 rpc_authflavor_t *auth_flavs; 145 struct net *net; 146 }; 147 148 struct nfs_mount_info { 149 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 150 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 151 struct nfs_parsed_mount_data *parsed; 152 struct nfs_clone_mount *cloned; 153 struct nfs_fh *mntfh; 154 }; 155 156 extern int nfs_mount(struct nfs_mount_request *info); 157 extern void nfs_umount(const struct nfs_mount_request *info); 158 159 /* client.c */ 160 extern const struct rpc_program nfs_program; 161 extern void nfs_clients_init(struct net *net); 162 extern void nfs_clients_exit(struct net *net); 163 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 164 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 165 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 166 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 167 void nfs_server_insert_lists(struct nfs_server *); 168 void nfs_server_remove_lists(struct nfs_server *); 169 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 170 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 171 rpc_authflavor_t); 172 struct nfs_server *nfs_alloc_server(void); 173 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 174 175 extern void nfs_put_client(struct nfs_client *); 176 extern void nfs_free_client(struct nfs_client *); 177 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 178 extern struct nfs_client * 179 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 180 struct nfs4_sessionid *, u32); 181 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 182 struct nfs_subversion *); 183 extern struct nfs_server *nfs4_create_server( 184 struct nfs_mount_info *, 185 struct nfs_subversion *); 186 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 187 struct nfs_fh *); 188 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 189 struct sockaddr *sap, size_t salen, 190 struct net *net); 191 extern void nfs_free_server(struct nfs_server *server); 192 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 193 struct nfs_fh *, 194 struct nfs_fattr *, 195 rpc_authflavor_t); 196 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 197 extern int nfs_client_init_status(const struct nfs_client *clp); 198 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 199 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 200 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 201 const struct sockaddr *ds_addr, 202 int ds_addrlen, int ds_proto, 203 unsigned int ds_timeo, 204 unsigned int ds_retrans, 205 u32 minor_version); 206 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 207 struct inode *); 208 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 209 const struct sockaddr *ds_addr, int ds_addrlen, 210 int ds_proto, unsigned int ds_timeo, 211 unsigned int ds_retrans); 212 #ifdef CONFIG_PROC_FS 213 extern int __init nfs_fs_proc_init(void); 214 extern void nfs_fs_proc_exit(void); 215 extern int nfs_fs_proc_net_init(struct net *net); 216 extern void nfs_fs_proc_net_exit(struct net *net); 217 #else 218 static inline int nfs_fs_proc_net_init(struct net *net) 219 { 220 return 0; 221 } 222 static inline void nfs_fs_proc_net_exit(struct net *net) 223 { 224 } 225 static inline int nfs_fs_proc_init(void) 226 { 227 return 0; 228 } 229 static inline void nfs_fs_proc_exit(void) 230 { 231 } 232 #endif 233 234 /* callback_xdr.c */ 235 extern const struct svc_version nfs4_callback_version1; 236 extern const struct svc_version nfs4_callback_version4; 237 238 struct nfs_pageio_descriptor; 239 /* pagelist.c */ 240 extern int __init nfs_init_nfspagecache(void); 241 extern void nfs_destroy_nfspagecache(void); 242 extern int __init nfs_init_readpagecache(void); 243 extern void nfs_destroy_readpagecache(void); 244 extern int __init nfs_init_writepagecache(void); 245 extern void nfs_destroy_writepagecache(void); 246 247 extern int __init nfs_init_directcache(void); 248 extern void nfs_destroy_directcache(void); 249 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 250 struct nfs_pgio_header *hdr, 251 void (*release)(struct nfs_pgio_header *hdr)); 252 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 253 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 254 255 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 256 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 257 void nfs_pgio_header_free(struct nfs_pgio_header *); 258 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 259 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 260 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, 261 const struct rpc_call_ops *call_ops, int how, int flags); 262 void nfs_free_request(struct nfs_page *req); 263 struct nfs_pgio_mirror * 264 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 265 266 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc) 267 { 268 WARN_ON_ONCE(desc->pg_mirror_count < 1); 269 return desc->pg_mirror_count > 1; 270 } 271 272 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 273 const struct nfs_open_context *ctx2) 274 { 275 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; 276 } 277 278 /* nfs2xdr.c */ 279 extern const struct rpc_procinfo nfs_procedures[]; 280 extern int nfs2_decode_dirent(struct xdr_stream *, 281 struct nfs_entry *, bool); 282 283 /* nfs3xdr.c */ 284 extern const struct rpc_procinfo nfs3_procedures[]; 285 extern int nfs3_decode_dirent(struct xdr_stream *, 286 struct nfs_entry *, bool); 287 288 /* nfs4xdr.c */ 289 #if IS_ENABLED(CONFIG_NFS_V4) 290 extern int nfs4_decode_dirent(struct xdr_stream *, 291 struct nfs_entry *, bool); 292 #endif 293 #ifdef CONFIG_NFS_V4_1 294 extern const u32 nfs41_maxread_overhead; 295 extern const u32 nfs41_maxwrite_overhead; 296 extern const u32 nfs41_maxgetdevinfo_overhead; 297 #endif 298 299 /* nfs4proc.c */ 300 #if IS_ENABLED(CONFIG_NFS_V4) 301 extern const struct rpc_procinfo nfs4_procedures[]; 302 #endif 303 304 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 305 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 306 static inline struct nfs4_label * 307 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 308 { 309 if (!dst || !src) 310 return NULL; 311 312 if (src->len > NFS4_MAXLABELLEN) 313 return NULL; 314 315 dst->lfs = src->lfs; 316 dst->pi = src->pi; 317 dst->len = src->len; 318 memcpy(dst->label, src->label, src->len); 319 320 return dst; 321 } 322 static inline void nfs4_label_free(struct nfs4_label *label) 323 { 324 if (label) { 325 kfree(label->label); 326 kfree(label); 327 } 328 return; 329 } 330 331 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 332 { 333 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 334 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 335 } 336 #else 337 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 338 static inline void nfs4_label_free(void *label) {} 339 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 340 { 341 } 342 static inline struct nfs4_label * 343 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 344 { 345 return NULL; 346 } 347 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 348 349 /* proc.c */ 350 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 351 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 352 const struct nfs_client_initdata *); 353 354 /* dir.c */ 355 extern void nfs_advise_use_readdirplus(struct inode *dir); 356 extern void nfs_force_use_readdirplus(struct inode *dir); 357 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 358 struct shrink_control *sc); 359 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 360 struct shrink_control *sc); 361 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 362 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 363 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 364 int nfs_rmdir(struct inode *, struct dentry *); 365 int nfs_unlink(struct inode *, struct dentry *); 366 int nfs_symlink(struct inode *, struct dentry *, const char *); 367 int nfs_link(struct dentry *, struct inode *, struct dentry *); 368 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 369 int nfs_rename(struct inode *, struct dentry *, 370 struct inode *, struct dentry *, unsigned int); 371 372 /* file.c */ 373 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 374 loff_t nfs_file_llseek(struct file *, loff_t, int); 375 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 376 int nfs_file_mmap(struct file *, struct vm_area_struct *); 377 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 378 int nfs_file_release(struct inode *, struct file *); 379 int nfs_lock(struct file *, int, struct file_lock *); 380 int nfs_flock(struct file *, int, struct file_lock *); 381 int nfs_check_flags(int); 382 383 /* inode.c */ 384 extern struct workqueue_struct *nfsiod_workqueue; 385 extern struct inode *nfs_alloc_inode(struct super_block *sb); 386 extern void nfs_free_inode(struct inode *); 387 extern int nfs_write_inode(struct inode *, struct writeback_control *); 388 extern int nfs_drop_inode(struct inode *); 389 extern void nfs_clear_inode(struct inode *); 390 extern void nfs_evict_inode(struct inode *); 391 void nfs_zap_acl_cache(struct inode *inode); 392 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 393 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 394 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); 395 396 /* super.c */ 397 extern const struct super_operations nfs_sops; 398 extern struct file_system_type nfs_fs_type; 399 extern struct file_system_type nfs_xdev_fs_type; 400 #if IS_ENABLED(CONFIG_NFS_V4) 401 extern struct file_system_type nfs4_referral_fs_type; 402 #endif 403 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 404 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 405 struct nfs_subversion *); 406 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 407 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 408 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 409 struct nfs_mount_info *, struct nfs_subversion *); 410 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 411 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 412 const char *, struct nfs_mount_info *); 413 void nfs_kill_super(struct super_block *); 414 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 415 416 extern struct rpc_stat nfs_rpcstat; 417 418 extern int __init register_nfs_fs(void); 419 extern void __exit unregister_nfs_fs(void); 420 extern bool nfs_sb_active(struct super_block *sb); 421 extern void nfs_sb_deactive(struct super_block *sb); 422 423 /* io.c */ 424 extern void nfs_start_io_read(struct inode *inode); 425 extern void nfs_end_io_read(struct inode *inode); 426 extern void nfs_start_io_write(struct inode *inode); 427 extern void nfs_end_io_write(struct inode *inode); 428 extern void nfs_start_io_direct(struct inode *inode); 429 extern void nfs_end_io_direct(struct inode *inode); 430 431 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 432 { 433 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 434 } 435 436 /* namespace.c */ 437 #define NFS_PATH_CANONICAL 1 438 extern char *nfs_path(char **p, struct dentry *dentry, 439 char *buffer, ssize_t buflen, unsigned flags); 440 extern struct vfsmount *nfs_d_automount(struct path *path); 441 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 442 struct nfs_fh *, struct nfs_fattr *); 443 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 444 struct nfs_fattr *, rpc_authflavor_t); 445 446 /* getroot.c */ 447 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 448 const char *); 449 #if IS_ENABLED(CONFIG_NFS_V4) 450 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 451 const char *); 452 453 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 454 #endif 455 456 struct nfs_pgio_completion_ops; 457 /* read.c */ 458 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 459 struct inode *inode, bool force_mds, 460 const struct nfs_pgio_completion_ops *compl_ops); 461 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 462 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 463 464 /* super.c */ 465 void nfs_umount_begin(struct super_block *); 466 int nfs_statfs(struct dentry *, struct kstatfs *); 467 int nfs_show_options(struct seq_file *, struct dentry *); 468 int nfs_show_devname(struct seq_file *, struct dentry *); 469 int nfs_show_path(struct seq_file *, struct dentry *); 470 int nfs_show_stats(struct seq_file *, struct dentry *); 471 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 472 473 /* write.c */ 474 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 475 struct inode *inode, int ioflags, bool force_mds, 476 const struct nfs_pgio_completion_ops *compl_ops); 477 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 478 extern void nfs_commit_free(struct nfs_commit_data *p); 479 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 480 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 481 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 482 struct nfs_commit_data *data, 483 const struct nfs_rpc_ops *nfs_ops, 484 const struct rpc_call_ops *call_ops, 485 int how, int flags); 486 extern void nfs_init_commit(struct nfs_commit_data *data, 487 struct list_head *head, 488 struct pnfs_layout_segment *lseg, 489 struct nfs_commit_info *cinfo); 490 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 491 struct nfs_commit_info *cinfo, int max); 492 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 493 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 494 struct nfs_commit_info *cinfo); 495 void nfs_mark_request_commit(struct nfs_page *req, 496 struct pnfs_layout_segment *lseg, 497 struct nfs_commit_info *cinfo, 498 u32 ds_commit_idx); 499 int nfs_write_need_commit(struct nfs_pgio_header *); 500 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 501 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 502 int how, struct nfs_commit_info *cinfo); 503 void nfs_retry_commit(struct list_head *page_list, 504 struct pnfs_layout_segment *lseg, 505 struct nfs_commit_info *cinfo, 506 u32 ds_commit_idx); 507 void nfs_commitdata_release(struct nfs_commit_data *data); 508 void nfs_request_add_commit_list(struct nfs_page *req, 509 struct nfs_commit_info *cinfo); 510 void nfs_request_add_commit_list_locked(struct nfs_page *req, 511 struct list_head *dst, 512 struct nfs_commit_info *cinfo); 513 void nfs_request_remove_commit_list(struct nfs_page *req, 514 struct nfs_commit_info *cinfo); 515 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 516 struct inode *inode, 517 struct nfs_direct_req *dreq); 518 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 519 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 520 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 521 522 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 523 loff_t lstart, loff_t lend); 524 525 #ifdef CONFIG_NFS_V4_1 526 static inline 527 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 528 { 529 int i; 530 531 for (i = 0; i < cinfo->nbuckets; i++) 532 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 533 } 534 #else 535 static inline 536 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 537 { 538 } 539 #endif 540 541 #ifdef CONFIG_MIGRATION 542 extern int nfs_migrate_page(struct address_space *, 543 struct page *, struct page *, enum migrate_mode); 544 #endif 545 546 static inline int 547 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 548 const struct nfs_write_verifier *v2) 549 { 550 return memcmp(v1->data, v2->data, sizeof(v1->data)); 551 } 552 553 /* unlink.c */ 554 extern struct rpc_task * 555 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 556 struct dentry *old_dentry, struct dentry *new_dentry, 557 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 558 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 559 560 /* direct.c */ 561 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 562 struct nfs_direct_req *dreq); 563 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 564 565 /* nfs4proc.c */ 566 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 567 const struct nfs_client_initdata *); 568 extern int nfs40_walk_client_list(struct nfs_client *clp, 569 struct nfs_client **result, 570 const struct cred *cred); 571 extern int nfs41_walk_client_list(struct nfs_client *clp, 572 struct nfs_client **result, 573 const struct cred *cred); 574 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, 575 struct rpc_xprt *xprt, 576 void *data); 577 578 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 579 { 580 inode = igrab(inode); 581 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 582 iput(inode); 583 inode = NULL; 584 } 585 return inode; 586 } 587 588 static inline void nfs_iput_and_deactive(struct inode *inode) 589 { 590 if (inode != NULL) { 591 struct super_block *sb = inode->i_sb; 592 593 iput(inode); 594 nfs_sb_deactive(sb); 595 } 596 } 597 598 /* 599 * Determine the device name as a string 600 */ 601 static inline char *nfs_devname(struct dentry *dentry, 602 char *buffer, ssize_t buflen) 603 { 604 char *dummy; 605 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 606 } 607 608 /* 609 * Determine the actual block size (and log2 thereof) 610 */ 611 static inline 612 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 613 { 614 /* make sure blocksize is a power of two */ 615 if ((bsize & (bsize - 1)) || nrbitsp) { 616 unsigned char nrbits; 617 618 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 619 ; 620 bsize = 1 << nrbits; 621 if (nrbitsp) 622 *nrbitsp = nrbits; 623 } 624 625 return bsize; 626 } 627 628 /* 629 * Calculate the number of 512byte blocks used. 630 */ 631 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 632 { 633 blkcnt_t used = (tsize + 511) >> 9; 634 return (used > ULONG_MAX) ? ULONG_MAX : used; 635 } 636 637 /* 638 * Compute and set NFS server blocksize 639 */ 640 static inline 641 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 642 { 643 if (bsize < NFS_MIN_FILE_IO_SIZE) 644 bsize = NFS_DEF_FILE_IO_SIZE; 645 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 646 bsize = NFS_MAX_FILE_IO_SIZE; 647 648 return nfs_block_bits(bsize, nrbitsp); 649 } 650 651 /* 652 * Determine the maximum file size for a superblock 653 */ 654 static inline 655 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 656 { 657 sb->s_maxbytes = (loff_t)maxfilesize; 658 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 659 sb->s_maxbytes = MAX_LFS_FILESIZE; 660 } 661 662 /* 663 * Record the page as unstable and mark its inode as dirty. 664 */ 665 static inline 666 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) 667 { 668 if (!cinfo->dreq) { 669 struct inode *inode = page_file_mapping(page)->host; 670 671 inc_node_page_state(page, NR_UNSTABLE_NFS); 672 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE); 673 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 674 } 675 } 676 677 /* 678 * Determine the number of bytes of data the page contains 679 */ 680 static inline 681 unsigned int nfs_page_length(struct page *page) 682 { 683 loff_t i_size = i_size_read(page_file_mapping(page)->host); 684 685 if (i_size > 0) { 686 pgoff_t index = page_index(page); 687 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 688 if (index < end_index) 689 return PAGE_SIZE; 690 if (index == end_index) 691 return ((i_size - 1) & ~PAGE_MASK) + 1; 692 } 693 return 0; 694 } 695 696 /* 697 * Convert a umode to a dirent->d_type 698 */ 699 static inline 700 unsigned char nfs_umode_to_dtype(umode_t mode) 701 { 702 return (mode >> 12) & 15; 703 } 704 705 /* 706 * Determine the number of pages in an array of length 'len' and 707 * with a base offset of 'base' 708 */ 709 static inline 710 unsigned int nfs_page_array_len(unsigned int base, size_t len) 711 { 712 return ((unsigned long)len + (unsigned long)base + 713 PAGE_SIZE - 1) >> PAGE_SHIFT; 714 } 715 716 /* 717 * Convert a struct timespec into a 64-bit change attribute 718 * 719 * This does approximately the same thing as timespec_to_ns(), 720 * but for calculation efficiency, we multiply the seconds by 721 * 1024*1024*1024. 722 */ 723 static inline 724 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 725 { 726 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 727 } 728 729 #ifdef CONFIG_CRC32 730 /** 731 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 732 * @fh - pointer to filehandle 733 * 734 * returns a crc32 hash for the filehandle that is compatible with 735 * the one displayed by "wireshark". 736 */ 737 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 738 { 739 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 740 } 741 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 742 { 743 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 744 NFS4_STATEID_OTHER_SIZE); 745 } 746 #else 747 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 748 { 749 return 0; 750 } 751 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 752 { 753 return 0; 754 } 755 #endif 756 757 static inline bool nfs_error_is_fatal(int err) 758 { 759 switch (err) { 760 case -ERESTARTSYS: 761 case -EINTR: 762 case -EACCES: 763 case -EDQUOT: 764 case -EFBIG: 765 case -EIO: 766 case -ENOSPC: 767 case -EROFS: 768 case -ESTALE: 769 case -E2BIG: 770 case -ENOMEM: 771 case -ETIMEDOUT: 772 return true; 773 default: 774 return false; 775 } 776 } 777 778 static inline bool nfs_error_is_fatal_on_server(int err) 779 { 780 switch (err) { 781 case 0: 782 case -ERESTARTSYS: 783 case -EINTR: 784 return false; 785 } 786 return nfs_error_is_fatal(err); 787 } 788