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 (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_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 struct net *net; 85 const struct rpc_timeout *timeparms; 86 }; 87 88 /* 89 * In-kernel mount arguments 90 */ 91 struct nfs_parsed_mount_data { 92 int flags; 93 unsigned int rsize, wsize; 94 unsigned int timeo, retrans; 95 unsigned int acregmin, acregmax, 96 acdirmin, acdirmax; 97 unsigned int namlen; 98 unsigned int options; 99 unsigned int bsize; 100 struct nfs_auth_info auth_info; 101 rpc_authflavor_t selected_flavor; 102 char *client_address; 103 unsigned int version; 104 unsigned int minorversion; 105 char *fscache_uniq; 106 bool need_mount; 107 108 struct { 109 struct sockaddr_storage address; 110 size_t addrlen; 111 char *hostname; 112 u32 version; 113 int port; 114 unsigned short protocol; 115 } mount_server; 116 117 struct { 118 struct sockaddr_storage address; 119 size_t addrlen; 120 char *hostname; 121 char *export_path; 122 int port; 123 unsigned short protocol; 124 } nfs_server; 125 126 struct security_mnt_opts lsm_opts; 127 struct net *net; 128 }; 129 130 /* mount_clnt.c */ 131 struct nfs_mount_request { 132 struct sockaddr *sap; 133 size_t salen; 134 char *hostname; 135 char *dirpath; 136 u32 version; 137 unsigned short protocol; 138 struct nfs_fh *fh; 139 int noresvport; 140 unsigned int *auth_flav_len; 141 rpc_authflavor_t *auth_flavs; 142 struct net *net; 143 }; 144 145 struct nfs_mount_info { 146 void (*fill_super)(struct super_block *, struct nfs_mount_info *); 147 int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *); 148 struct nfs_parsed_mount_data *parsed; 149 struct nfs_clone_mount *cloned; 150 struct nfs_fh *mntfh; 151 }; 152 153 extern int nfs_mount(struct nfs_mount_request *info); 154 extern void nfs_umount(const struct nfs_mount_request *info); 155 156 /* client.c */ 157 extern const struct rpc_program nfs_program; 158 extern void nfs_clients_init(struct net *net); 159 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 160 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 161 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 162 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *); 163 void nfs_server_insert_lists(struct nfs_server *); 164 void nfs_server_remove_lists(struct nfs_server *); 165 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 166 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 167 rpc_authflavor_t); 168 struct nfs_server *nfs_alloc_server(void); 169 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 170 171 extern void nfs_cleanup_cb_ident_idr(struct net *); 172 extern void nfs_put_client(struct nfs_client *); 173 extern void nfs_free_client(struct nfs_client *); 174 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 175 extern struct nfs_client * 176 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 177 struct nfs4_sessionid *, u32); 178 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *, 179 struct nfs_subversion *); 180 extern struct nfs_server *nfs4_create_server( 181 struct nfs_mount_info *, 182 struct nfs_subversion *); 183 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *, 184 struct nfs_fh *); 185 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 186 struct sockaddr *sap, size_t salen, 187 struct net *net); 188 extern void nfs_free_server(struct nfs_server *server); 189 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 190 struct nfs_fh *, 191 struct nfs_fattr *, 192 rpc_authflavor_t); 193 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 194 extern int nfs_client_init_status(const struct nfs_client *clp); 195 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 196 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 197 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 198 const struct sockaddr *ds_addr, 199 int ds_addrlen, int ds_proto, 200 unsigned int ds_timeo, 201 unsigned int ds_retrans, 202 u32 minor_version); 203 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 204 struct inode *); 205 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 206 const struct sockaddr *ds_addr, int ds_addrlen, 207 int ds_proto, unsigned int ds_timeo, 208 unsigned int ds_retrans); 209 #ifdef CONFIG_PROC_FS 210 extern int __init nfs_fs_proc_init(void); 211 extern void nfs_fs_proc_exit(void); 212 extern int nfs_fs_proc_net_init(struct net *net); 213 extern void nfs_fs_proc_net_exit(struct net *net); 214 #else 215 static inline int nfs_fs_proc_net_init(struct net *net) 216 { 217 return 0; 218 } 219 static inline void nfs_fs_proc_net_exit(struct net *net) 220 { 221 } 222 static inline int nfs_fs_proc_init(void) 223 { 224 return 0; 225 } 226 static inline void nfs_fs_proc_exit(void) 227 { 228 } 229 #endif 230 231 /* callback_xdr.c */ 232 extern const struct svc_version nfs4_callback_version1; 233 extern const struct svc_version nfs4_callback_version4; 234 235 struct nfs_pageio_descriptor; 236 /* pagelist.c */ 237 extern int __init nfs_init_nfspagecache(void); 238 extern void nfs_destroy_nfspagecache(void); 239 extern int __init nfs_init_readpagecache(void); 240 extern void nfs_destroy_readpagecache(void); 241 extern int __init nfs_init_writepagecache(void); 242 extern void nfs_destroy_writepagecache(void); 243 244 extern int __init nfs_init_directcache(void); 245 extern void nfs_destroy_directcache(void); 246 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 247 struct nfs_pgio_header *hdr, 248 void (*release)(struct nfs_pgio_header *hdr)); 249 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 250 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 251 252 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 253 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 254 void nfs_pgio_header_free(struct nfs_pgio_header *); 255 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 256 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 257 struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops, 258 const struct rpc_call_ops *call_ops, int how, int flags); 259 void nfs_free_request(struct nfs_page *req); 260 struct nfs_pgio_mirror * 261 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 262 263 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc) 264 { 265 WARN_ON_ONCE(desc->pg_mirror_count < 1); 266 return desc->pg_mirror_count > 1; 267 } 268 269 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 270 const struct nfs_open_context *ctx2) 271 { 272 return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state; 273 } 274 275 /* nfs2xdr.c */ 276 extern const struct rpc_procinfo nfs_procedures[]; 277 extern int nfs2_decode_dirent(struct xdr_stream *, 278 struct nfs_entry *, bool); 279 280 /* nfs3xdr.c */ 281 extern const struct rpc_procinfo nfs3_procedures[]; 282 extern int nfs3_decode_dirent(struct xdr_stream *, 283 struct nfs_entry *, bool); 284 285 /* nfs4xdr.c */ 286 #if IS_ENABLED(CONFIG_NFS_V4) 287 extern int nfs4_decode_dirent(struct xdr_stream *, 288 struct nfs_entry *, bool); 289 #endif 290 #ifdef CONFIG_NFS_V4_1 291 extern const u32 nfs41_maxread_overhead; 292 extern const u32 nfs41_maxwrite_overhead; 293 extern const u32 nfs41_maxgetdevinfo_overhead; 294 #endif 295 296 /* nfs4proc.c */ 297 #if IS_ENABLED(CONFIG_NFS_V4) 298 extern const struct rpc_procinfo nfs4_procedures[]; 299 #endif 300 301 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 302 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 303 static inline struct nfs4_label * 304 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 305 { 306 if (!dst || !src) 307 return NULL; 308 309 if (src->len > NFS4_MAXLABELLEN) 310 return NULL; 311 312 dst->lfs = src->lfs; 313 dst->pi = src->pi; 314 dst->len = src->len; 315 memcpy(dst->label, src->label, src->len); 316 317 return dst; 318 } 319 static inline void nfs4_label_free(struct nfs4_label *label) 320 { 321 if (label) { 322 kfree(label->label); 323 kfree(label); 324 } 325 return; 326 } 327 328 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 329 { 330 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 331 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 332 } 333 #else 334 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 335 static inline void nfs4_label_free(void *label) {} 336 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 337 { 338 } 339 static inline struct nfs4_label * 340 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 341 { 342 return NULL; 343 } 344 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 345 346 /* proc.c */ 347 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 348 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 349 const struct nfs_client_initdata *); 350 351 /* dir.c */ 352 extern void nfs_advise_use_readdirplus(struct inode *dir); 353 extern void nfs_force_use_readdirplus(struct inode *dir); 354 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 355 struct shrink_control *sc); 356 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 357 struct shrink_control *sc); 358 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 359 int nfs_create(struct inode *, struct dentry *, umode_t, bool); 360 int nfs_mkdir(struct inode *, struct dentry *, umode_t); 361 int nfs_rmdir(struct inode *, struct dentry *); 362 int nfs_unlink(struct inode *, struct dentry *); 363 int nfs_symlink(struct inode *, struct dentry *, const char *); 364 int nfs_link(struct dentry *, struct inode *, struct dentry *); 365 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); 366 int nfs_rename(struct inode *, struct dentry *, 367 struct inode *, struct dentry *, unsigned int); 368 369 /* file.c */ 370 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 371 loff_t nfs_file_llseek(struct file *, loff_t, int); 372 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 373 int nfs_file_mmap(struct file *, struct vm_area_struct *); 374 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 375 int nfs_file_release(struct inode *, struct file *); 376 int nfs_lock(struct file *, int, struct file_lock *); 377 int nfs_flock(struct file *, int, struct file_lock *); 378 int nfs_check_flags(int); 379 380 /* inode.c */ 381 extern struct workqueue_struct *nfsiod_workqueue; 382 extern struct inode *nfs_alloc_inode(struct super_block *sb); 383 extern void nfs_destroy_inode(struct inode *); 384 extern int nfs_write_inode(struct inode *, struct writeback_control *); 385 extern int nfs_drop_inode(struct inode *); 386 extern void nfs_clear_inode(struct inode *); 387 extern void nfs_evict_inode(struct inode *); 388 void nfs_zap_acl_cache(struct inode *inode); 389 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 390 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 391 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode); 392 393 /* super.c */ 394 extern const struct super_operations nfs_sops; 395 extern struct file_system_type nfs_fs_type; 396 extern struct file_system_type nfs_xdev_fs_type; 397 #if IS_ENABLED(CONFIG_NFS_V4) 398 extern struct file_system_type nfs4_xdev_fs_type; 399 extern struct file_system_type nfs4_referral_fs_type; 400 #endif 401 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 402 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *, 403 struct nfs_subversion *); 404 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 405 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *); 406 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *, 407 struct nfs_mount_info *, struct nfs_subversion *); 408 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *); 409 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int, 410 const char *, struct nfs_mount_info *); 411 void nfs_kill_super(struct super_block *); 412 void nfs_fill_super(struct super_block *, struct nfs_mount_info *); 413 414 extern struct rpc_stat nfs_rpcstat; 415 416 extern int __init register_nfs_fs(void); 417 extern void __exit unregister_nfs_fs(void); 418 extern bool nfs_sb_active(struct super_block *sb); 419 extern void nfs_sb_deactive(struct super_block *sb); 420 421 /* io.c */ 422 extern void nfs_start_io_read(struct inode *inode); 423 extern void nfs_end_io_read(struct inode *inode); 424 extern void nfs_start_io_write(struct inode *inode); 425 extern void nfs_end_io_write(struct inode *inode); 426 extern void nfs_start_io_direct(struct inode *inode); 427 extern void nfs_end_io_direct(struct inode *inode); 428 429 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 430 { 431 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 432 } 433 434 /* namespace.c */ 435 #define NFS_PATH_CANONICAL 1 436 extern char *nfs_path(char **p, struct dentry *dentry, 437 char *buffer, ssize_t buflen, unsigned flags); 438 extern struct vfsmount *nfs_d_automount(struct path *path); 439 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *, 440 struct nfs_fh *, struct nfs_fattr *); 441 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *, 442 struct nfs_fattr *, rpc_authflavor_t); 443 444 /* getroot.c */ 445 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *, 446 const char *); 447 #if IS_ENABLED(CONFIG_NFS_V4) 448 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *, 449 const char *); 450 451 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 452 #endif 453 454 struct nfs_pgio_completion_ops; 455 /* read.c */ 456 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 457 struct inode *inode, bool force_mds, 458 const struct nfs_pgio_completion_ops *compl_ops); 459 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 460 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 461 462 /* super.c */ 463 void nfs_umount_begin(struct super_block *); 464 int nfs_statfs(struct dentry *, struct kstatfs *); 465 int nfs_show_options(struct seq_file *, struct dentry *); 466 int nfs_show_devname(struct seq_file *, struct dentry *); 467 int nfs_show_path(struct seq_file *, struct dentry *); 468 int nfs_show_stats(struct seq_file *, struct dentry *); 469 int nfs_remount(struct super_block *sb, int *flags, char *raw_data); 470 471 /* write.c */ 472 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 473 struct inode *inode, int ioflags, bool force_mds, 474 const struct nfs_pgio_completion_ops *compl_ops); 475 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 476 extern void nfs_commit_free(struct nfs_commit_data *p); 477 extern void nfs_write_prepare(struct rpc_task *task, void *calldata); 478 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 479 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 480 struct nfs_commit_data *data, 481 const struct nfs_rpc_ops *nfs_ops, 482 const struct rpc_call_ops *call_ops, 483 int how, int flags); 484 extern void nfs_init_commit(struct nfs_commit_data *data, 485 struct list_head *head, 486 struct pnfs_layout_segment *lseg, 487 struct nfs_commit_info *cinfo); 488 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 489 struct nfs_commit_info *cinfo, int max); 490 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 491 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 492 struct nfs_commit_info *cinfo); 493 void nfs_mark_request_commit(struct nfs_page *req, 494 struct pnfs_layout_segment *lseg, 495 struct nfs_commit_info *cinfo, 496 u32 ds_commit_idx); 497 int nfs_write_need_commit(struct nfs_pgio_header *); 498 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 499 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 500 int how, struct nfs_commit_info *cinfo); 501 void nfs_retry_commit(struct list_head *page_list, 502 struct pnfs_layout_segment *lseg, 503 struct nfs_commit_info *cinfo, 504 u32 ds_commit_idx); 505 void nfs_commitdata_release(struct nfs_commit_data *data); 506 void nfs_request_add_commit_list(struct nfs_page *req, 507 struct nfs_commit_info *cinfo); 508 void nfs_request_add_commit_list_locked(struct nfs_page *req, 509 struct list_head *dst, 510 struct nfs_commit_info *cinfo); 511 void nfs_request_remove_commit_list(struct nfs_page *req, 512 struct nfs_commit_info *cinfo); 513 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 514 struct inode *inode, 515 struct nfs_direct_req *dreq); 516 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 517 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 518 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 519 520 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 521 loff_t lstart, loff_t lend); 522 523 #ifdef CONFIG_NFS_V4_1 524 static inline 525 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 526 { 527 int i; 528 529 for (i = 0; i < cinfo->nbuckets; i++) 530 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 531 } 532 #else 533 static inline 534 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 535 { 536 } 537 #endif 538 539 #ifdef CONFIG_MIGRATION 540 extern int nfs_migrate_page(struct address_space *, 541 struct page *, struct page *, enum migrate_mode); 542 #endif 543 544 static inline int 545 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 546 const struct nfs_write_verifier *v2) 547 { 548 return memcmp(v1->data, v2->data, sizeof(v1->data)); 549 } 550 551 /* unlink.c */ 552 extern struct rpc_task * 553 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 554 struct dentry *old_dentry, struct dentry *new_dentry, 555 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 556 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 557 558 /* direct.c */ 559 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 560 struct nfs_direct_req *dreq); 561 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq); 562 563 /* nfs4proc.c */ 564 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 565 const struct nfs_client_initdata *); 566 extern int nfs40_walk_client_list(struct nfs_client *clp, 567 struct nfs_client **result, 568 struct rpc_cred *cred); 569 extern int nfs41_walk_client_list(struct nfs_client *clp, 570 struct nfs_client **result, 571 struct rpc_cred *cred); 572 extern int nfs4_test_session_trunk(struct rpc_clnt *, 573 struct rpc_xprt *, 574 void *); 575 576 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 577 { 578 inode = igrab(inode); 579 if (inode != NULL && !nfs_sb_active(inode->i_sb)) { 580 iput(inode); 581 inode = NULL; 582 } 583 return inode; 584 } 585 586 static inline void nfs_iput_and_deactive(struct inode *inode) 587 { 588 if (inode != NULL) { 589 struct super_block *sb = inode->i_sb; 590 591 iput(inode); 592 nfs_sb_deactive(sb); 593 } 594 } 595 596 /* 597 * Determine the device name as a string 598 */ 599 static inline char *nfs_devname(struct dentry *dentry, 600 char *buffer, ssize_t buflen) 601 { 602 char *dummy; 603 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 604 } 605 606 /* 607 * Determine the actual block size (and log2 thereof) 608 */ 609 static inline 610 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 611 { 612 /* make sure blocksize is a power of two */ 613 if ((bsize & (bsize - 1)) || nrbitsp) { 614 unsigned char nrbits; 615 616 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 617 ; 618 bsize = 1 << nrbits; 619 if (nrbitsp) 620 *nrbitsp = nrbits; 621 } 622 623 return bsize; 624 } 625 626 /* 627 * Calculate the number of 512byte blocks used. 628 */ 629 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 630 { 631 blkcnt_t used = (tsize + 511) >> 9; 632 return (used > ULONG_MAX) ? ULONG_MAX : used; 633 } 634 635 /* 636 * Compute and set NFS server blocksize 637 */ 638 static inline 639 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 640 { 641 if (bsize < NFS_MIN_FILE_IO_SIZE) 642 bsize = NFS_DEF_FILE_IO_SIZE; 643 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 644 bsize = NFS_MAX_FILE_IO_SIZE; 645 646 return nfs_block_bits(bsize, nrbitsp); 647 } 648 649 /* 650 * Determine the maximum file size for a superblock 651 */ 652 static inline 653 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 654 { 655 sb->s_maxbytes = (loff_t)maxfilesize; 656 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 657 sb->s_maxbytes = MAX_LFS_FILESIZE; 658 } 659 660 /* 661 * Record the page as unstable and mark its inode as dirty. 662 */ 663 static inline 664 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo) 665 { 666 if (!cinfo->dreq) { 667 struct inode *inode = page_file_mapping(page)->host; 668 669 inc_node_page_state(page, NR_UNSTABLE_NFS); 670 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE); 671 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 672 } 673 } 674 675 /* 676 * Determine the number of bytes of data the page contains 677 */ 678 static inline 679 unsigned int nfs_page_length(struct page *page) 680 { 681 loff_t i_size = i_size_read(page_file_mapping(page)->host); 682 683 if (i_size > 0) { 684 pgoff_t index = page_index(page); 685 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 686 if (index < end_index) 687 return PAGE_SIZE; 688 if (index == end_index) 689 return ((i_size - 1) & ~PAGE_MASK) + 1; 690 } 691 return 0; 692 } 693 694 /* 695 * Convert a umode to a dirent->d_type 696 */ 697 static inline 698 unsigned char nfs_umode_to_dtype(umode_t mode) 699 { 700 return (mode >> 12) & 15; 701 } 702 703 /* 704 * Determine the number of pages in an array of length 'len' and 705 * with a base offset of 'base' 706 */ 707 static inline 708 unsigned int nfs_page_array_len(unsigned int base, size_t len) 709 { 710 return ((unsigned long)len + (unsigned long)base + 711 PAGE_SIZE - 1) >> PAGE_SHIFT; 712 } 713 714 /* 715 * Convert a struct timespec into a 64-bit change attribute 716 * 717 * This does approximately the same thing as timespec_to_ns(), 718 * but for calculation efficiency, we multiply the seconds by 719 * 1024*1024*1024. 720 */ 721 static inline 722 u64 nfs_timespec_to_change_attr(const struct timespec *ts) 723 { 724 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 725 } 726 727 #ifdef CONFIG_CRC32 728 /** 729 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 730 * @fh - pointer to filehandle 731 * 732 * returns a crc32 hash for the filehandle that is compatible with 733 * the one displayed by "wireshark". 734 */ 735 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 736 { 737 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 738 } 739 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 740 { 741 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 742 NFS4_STATEID_OTHER_SIZE); 743 } 744 #else 745 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 746 { 747 return 0; 748 } 749 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 750 { 751 return 0; 752 } 753 #endif 754 755 static inline bool nfs_error_is_fatal(int err) 756 { 757 switch (err) { 758 case -ERESTARTSYS: 759 case -EACCES: 760 case -EDQUOT: 761 case -EFBIG: 762 case -EIO: 763 case -ENOSPC: 764 case -EROFS: 765 case -ESTALE: 766 case -E2BIG: 767 return true; 768 default: 769 return false; 770 } 771 } 772 773 static inline void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) 774 { 775 ctx->error = error; 776 smp_wmb(); 777 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 778 } 779