1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * NFS internal definitions 4 */ 5 6 #include "nfs4_fs.h" 7 #include <linux/fs_context.h> 8 #include <linux/security.h> 9 #include <linux/crc32.h> 10 #include <linux/sunrpc/addr.h> 11 #include <linux/nfs_page.h> 12 #include <linux/wait_bit.h> 13 14 #define NFS_SB_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS) 15 16 extern const struct export_operations nfs_export_ops; 17 18 struct nfs_string; 19 struct nfs_pageio_descriptor; 20 21 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 22 { 23 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 24 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 25 } 26 27 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 28 { 29 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 30 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 31 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 32 return 0; 33 return 1; 34 } 35 36 static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry) 37 { 38 if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL)) 39 return false; 40 if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size) 41 return false; 42 return true; 43 } 44 45 static inline fmode_t flags_to_mode(int flags) 46 { 47 fmode_t res = (__force fmode_t)flags & FMODE_EXEC; 48 if ((flags & O_ACCMODE) != O_WRONLY) 49 res |= FMODE_READ; 50 if ((flags & O_ACCMODE) != O_RDONLY) 51 res |= FMODE_WRITE; 52 return res; 53 } 54 55 /* 56 * Note: RFC 1813 doesn't limit the number of auth flavors that 57 * a server can return, so make something up. 58 */ 59 #define NFS_MAX_SECFLAVORS (12) 60 61 /* 62 * Value used if the user did not specify a port value. 63 */ 64 #define NFS_UNSPEC_PORT (-1) 65 66 #define NFS_UNSPEC_RETRANS (UINT_MAX) 67 #define NFS_UNSPEC_TIMEO (UINT_MAX) 68 69 struct nfs_client_initdata { 70 unsigned long init_flags; 71 const char *hostname; /* Hostname of the server */ 72 const struct sockaddr_storage *addr; /* Address of the server */ 73 const char *nodename; /* Hostname of the client */ 74 const char *ip_addr; /* IP address of the client */ 75 size_t addrlen; 76 struct nfs_subversion *nfs_mod; 77 int proto; 78 u32 minorversion; 79 unsigned int nconnect; 80 unsigned int max_connect; 81 struct net *net; 82 const struct rpc_timeout *timeparms; 83 const struct cred *cred; 84 struct xprtsec_parms xprtsec; 85 unsigned long connect_timeout; 86 unsigned long reconnect_timeout; 87 }; 88 89 /* 90 * In-kernel mount arguments 91 */ 92 struct nfs_fs_context { 93 bool internal; 94 bool skip_reconfig_option_check; 95 bool need_mount; 96 bool sloppy; 97 unsigned int flags; /* NFS{,4}_MOUNT_* flags */ 98 unsigned int rsize, wsize; 99 unsigned int timeo, retrans; 100 unsigned int acregmin, acregmax; 101 unsigned int acdirmin, acdirmax; 102 unsigned int namlen; 103 unsigned int options; 104 unsigned int bsize; 105 struct nfs_auth_info auth_info; 106 rpc_authflavor_t selected_flavor; 107 struct xprtsec_parms xprtsec; 108 char *client_address; 109 unsigned int version; 110 unsigned int minorversion; 111 char *fscache_uniq; 112 unsigned short protofamily; 113 unsigned short mountfamily; 114 bool has_sec_mnt_opts; 115 116 struct { 117 union { 118 struct sockaddr address; 119 struct sockaddr_storage _address; 120 }; 121 size_t addrlen; 122 char *hostname; 123 u32 version; 124 int port; 125 unsigned short protocol; 126 } mount_server; 127 128 struct { 129 union { 130 struct sockaddr address; 131 struct sockaddr_storage _address; 132 }; 133 size_t addrlen; 134 char *hostname; 135 char *export_path; 136 int port; 137 unsigned short protocol; 138 unsigned short nconnect; 139 unsigned short max_connect; 140 unsigned short export_path_len; 141 } nfs_server; 142 143 struct nfs_fh *mntfh; 144 struct nfs_server *server; 145 struct nfs_subversion *nfs_mod; 146 147 /* Information for a cloned mount. */ 148 struct nfs_clone_mount { 149 struct super_block *sb; 150 struct dentry *dentry; 151 struct nfs_fattr *fattr; 152 unsigned int inherited_bsize; 153 } clone_data; 154 }; 155 156 #define nfs_errorf(fc, fmt, ...) ((fc)->log.log ? \ 157 errorf(fc, fmt, ## __VA_ARGS__) : \ 158 ({ dprintk(fmt "\n", ## __VA_ARGS__); })) 159 160 #define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ? \ 161 errorf(fc, fmt, ## __VA_ARGS__) : \ 162 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); })) 163 164 #define nfs_invalf(fc, fmt, ...) ((fc)->log.log ? \ 165 invalf(fc, fmt, ## __VA_ARGS__) : \ 166 ({ dprintk(fmt "\n", ## __VA_ARGS__); -EINVAL; })) 167 168 #define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ? \ 169 invalf(fc, fmt, ## __VA_ARGS__) : \ 170 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); -EINVAL; })) 171 172 #define nfs_warnf(fc, fmt, ...) ((fc)->log.log ? \ 173 warnf(fc, fmt, ## __VA_ARGS__) : \ 174 ({ dprintk(fmt "\n", ## __VA_ARGS__); })) 175 176 #define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ? \ 177 warnf(fc, fmt, ## __VA_ARGS__) : \ 178 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); })) 179 180 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc) 181 { 182 return fc->fs_private; 183 } 184 185 /* mount_clnt.c */ 186 struct nfs_mount_request { 187 struct sockaddr_storage *sap; 188 size_t salen; 189 char *hostname; 190 char *dirpath; 191 u32 version; 192 unsigned short protocol; 193 struct nfs_fh *fh; 194 int noresvport; 195 unsigned int *auth_flav_len; 196 rpc_authflavor_t *auth_flavs; 197 struct net *net; 198 }; 199 200 extern int nfs_mount(struct nfs_mount_request *info, int timeo, int retrans); 201 extern void nfs_umount(const struct nfs_mount_request *info); 202 203 /* client.c */ 204 extern const struct rpc_program nfs_program; 205 extern void nfs_clients_init(struct net *net); 206 extern void nfs_clients_exit(struct net *net); 207 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 208 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 209 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 210 int nfs_probe_server(struct nfs_server *, struct nfs_fh *); 211 void nfs_server_insert_lists(struct nfs_server *); 212 void nfs_server_remove_lists(struct nfs_server *); 213 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 214 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 215 rpc_authflavor_t); 216 struct nfs_server *nfs_alloc_server(void); 217 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 218 219 extern void nfs_put_client(struct nfs_client *); 220 extern void nfs_free_client(struct nfs_client *); 221 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 222 extern struct nfs_client * 223 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 224 struct nfs4_sessionid *, u32); 225 extern struct nfs_server *nfs_create_server(struct fs_context *); 226 extern void nfs4_server_set_init_caps(struct nfs_server *); 227 extern struct nfs_server *nfs4_create_server(struct fs_context *); 228 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *); 229 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 230 struct sockaddr_storage *sap, size_t salen, 231 struct net *net); 232 extern void nfs_free_server(struct nfs_server *server); 233 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 234 struct nfs_fh *, 235 struct nfs_fattr *, 236 rpc_authflavor_t); 237 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 238 extern int nfs_client_init_status(const struct nfs_client *clp); 239 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 240 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 241 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 242 const struct sockaddr_storage *ds_addr, 243 int ds_addrlen, int ds_proto, 244 unsigned int ds_timeo, 245 unsigned int ds_retrans, 246 u32 minor_version); 247 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 248 struct inode *); 249 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 250 const struct sockaddr_storage *ds_addr, int ds_addrlen, 251 int ds_proto, unsigned int ds_timeo, 252 unsigned int ds_retrans); 253 #ifdef CONFIG_PROC_FS 254 extern int __init nfs_fs_proc_init(void); 255 extern void nfs_fs_proc_exit(void); 256 extern int nfs_fs_proc_net_init(struct net *net); 257 extern void nfs_fs_proc_net_exit(struct net *net); 258 #else 259 static inline int nfs_fs_proc_net_init(struct net *net) 260 { 261 return 0; 262 } 263 static inline void nfs_fs_proc_net_exit(struct net *net) 264 { 265 } 266 static inline int nfs_fs_proc_init(void) 267 { 268 return 0; 269 } 270 static inline void nfs_fs_proc_exit(void) 271 { 272 } 273 #endif 274 275 /* callback_xdr.c */ 276 extern const struct svc_version nfs4_callback_version1; 277 extern const struct svc_version nfs4_callback_version4; 278 279 /* fs_context.c */ 280 extern struct file_system_type nfs_fs_type; 281 282 /* pagelist.c */ 283 extern int __init nfs_init_nfspagecache(void); 284 extern void nfs_destroy_nfspagecache(void); 285 extern int __init nfs_init_readpagecache(void); 286 extern void nfs_destroy_readpagecache(void); 287 extern int __init nfs_init_writepagecache(void); 288 extern void nfs_destroy_writepagecache(void); 289 290 extern int __init nfs_init_directcache(void); 291 extern void nfs_destroy_directcache(void); 292 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 293 struct nfs_pgio_header *hdr, 294 void (*release)(struct nfs_pgio_header *hdr)); 295 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 296 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 297 298 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 299 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 300 void nfs_pgio_header_free(struct nfs_pgio_header *); 301 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 302 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 303 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, 304 const struct rpc_call_ops *call_ops, int how, int flags); 305 void nfs_free_request(struct nfs_page *req); 306 struct nfs_pgio_mirror * 307 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 308 309 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 310 const struct nfs_open_context *ctx2) 311 { 312 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; 313 } 314 315 /* nfs2xdr.c */ 316 extern const struct rpc_procinfo nfs_procedures[]; 317 extern int nfs2_decode_dirent(struct xdr_stream *, 318 struct nfs_entry *, bool); 319 320 /* nfs3xdr.c */ 321 extern const struct rpc_procinfo nfs3_procedures[]; 322 extern int nfs3_decode_dirent(struct xdr_stream *, 323 struct nfs_entry *, bool); 324 325 /* nfs4xdr.c */ 326 #if IS_ENABLED(CONFIG_NFS_V4) 327 extern int nfs4_decode_dirent(struct xdr_stream *, 328 struct nfs_entry *, bool); 329 #endif 330 #ifdef CONFIG_NFS_V4_1 331 extern const u32 nfs41_maxread_overhead; 332 extern const u32 nfs41_maxwrite_overhead; 333 extern const u32 nfs41_maxgetdevinfo_overhead; 334 #endif 335 336 /* nfs4proc.c */ 337 #if IS_ENABLED(CONFIG_NFS_V4) 338 extern const struct rpc_procinfo nfs4_procedures[]; 339 #endif 340 341 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 342 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 343 static inline struct nfs4_label * 344 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 345 { 346 if (!dst || !src) 347 return NULL; 348 349 if (src->len > NFS4_MAXLABELLEN) 350 return NULL; 351 352 dst->lfs = src->lfs; 353 dst->pi = src->pi; 354 dst->len = src->len; 355 memcpy(dst->label, src->label, src->len); 356 357 return dst; 358 } 359 360 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 361 { 362 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 363 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 364 } 365 #else 366 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } 367 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 368 { 369 } 370 static inline struct nfs4_label * 371 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 372 { 373 return NULL; 374 } 375 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 376 377 /* proc.c */ 378 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 379 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 380 const struct nfs_client_initdata *); 381 382 /* dir.c */ 383 extern void nfs_readdir_record_entry_cache_hit(struct inode *dir); 384 extern void nfs_readdir_record_entry_cache_miss(struct inode *dir); 385 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 386 struct shrink_control *sc); 387 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 388 struct shrink_control *sc); 389 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 390 void nfs_d_prune_case_insensitive_aliases(struct inode *inode); 391 int nfs_create(struct mnt_idmap *, struct inode *, struct dentry *, 392 umode_t, bool); 393 int nfs_mkdir(struct mnt_idmap *, struct inode *, struct dentry *, 394 umode_t); 395 int nfs_rmdir(struct inode *, struct dentry *); 396 int nfs_unlink(struct inode *, struct dentry *); 397 int nfs_symlink(struct mnt_idmap *, struct inode *, struct dentry *, 398 const char *); 399 int nfs_link(struct dentry *, struct inode *, struct dentry *); 400 int nfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *, umode_t, 401 dev_t); 402 int nfs_rename(struct mnt_idmap *, struct inode *, struct dentry *, 403 struct inode *, struct dentry *, unsigned int); 404 405 #ifdef CONFIG_NFS_V4_2 406 static inline __u32 nfs_access_xattr_mask(const struct nfs_server *server) 407 { 408 if (!(server->caps & NFS_CAP_XATTR)) 409 return 0; 410 return NFS4_ACCESS_XAREAD | NFS4_ACCESS_XAWRITE | NFS4_ACCESS_XALIST; 411 } 412 #else 413 static inline __u32 nfs_access_xattr_mask(const struct nfs_server *server) 414 { 415 return 0; 416 } 417 #endif 418 419 /* file.c */ 420 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 421 loff_t nfs_file_llseek(struct file *, loff_t, int); 422 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 423 ssize_t nfs_file_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, 424 size_t len, unsigned int flags); 425 int nfs_file_mmap(struct file *, struct vm_area_struct *); 426 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 427 int nfs_file_release(struct inode *, struct file *); 428 int nfs_lock(struct file *, int, struct file_lock *); 429 int nfs_flock(struct file *, int, struct file_lock *); 430 int nfs_check_flags(int); 431 432 /* inode.c */ 433 extern struct workqueue_struct *nfsiod_workqueue; 434 extern struct inode *nfs_alloc_inode(struct super_block *sb); 435 extern void nfs_free_inode(struct inode *); 436 extern int nfs_write_inode(struct inode *, struct writeback_control *); 437 extern int nfs_drop_inode(struct inode *); 438 extern void nfs_clear_inode(struct inode *); 439 extern void nfs_evict_inode(struct inode *); 440 extern void nfs_zap_acl_cache(struct inode *inode); 441 extern void nfs_set_cache_invalid(struct inode *inode, unsigned long flags); 442 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 443 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 444 445 /* super.c */ 446 extern const struct super_operations nfs_sops; 447 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 448 int nfs_try_get_tree(struct fs_context *); 449 int nfs_get_tree_common(struct fs_context *); 450 void nfs_kill_super(struct super_block *); 451 452 extern int __init register_nfs_fs(void); 453 extern void __exit unregister_nfs_fs(void); 454 extern bool nfs_sb_active(struct super_block *sb); 455 extern void nfs_sb_deactive(struct super_block *sb); 456 extern int nfs_client_for_each_server(struct nfs_client *clp, 457 int (*fn)(struct nfs_server *, void *), 458 void *data); 459 #ifdef CONFIG_NFS_FSCACHE 460 extern const struct netfs_request_ops nfs_netfs_ops; 461 #endif 462 463 /* io.c */ 464 extern void nfs_start_io_read(struct inode *inode); 465 extern void nfs_end_io_read(struct inode *inode); 466 extern void nfs_start_io_write(struct inode *inode); 467 extern void nfs_end_io_write(struct inode *inode); 468 extern void nfs_start_io_direct(struct inode *inode); 469 extern void nfs_end_io_direct(struct inode *inode); 470 471 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 472 { 473 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 474 } 475 476 /* namespace.c */ 477 #define NFS_PATH_CANONICAL 1 478 extern char *nfs_path(char **p, struct dentry *dentry, 479 char *buffer, ssize_t buflen, unsigned flags); 480 extern struct vfsmount *nfs_d_automount(struct path *path); 481 int nfs_submount(struct fs_context *, struct nfs_server *); 482 int nfs_do_submount(struct fs_context *); 483 484 /* getroot.c */ 485 extern int nfs_get_root(struct super_block *s, struct fs_context *fc); 486 #if IS_ENABLED(CONFIG_NFS_V4) 487 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 488 #endif 489 490 struct nfs_pgio_completion_ops; 491 /* read.c */ 492 extern const struct nfs_pgio_completion_ops nfs_async_read_completion_ops; 493 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 494 struct inode *inode, bool force_mds, 495 const struct nfs_pgio_completion_ops *compl_ops); 496 extern bool nfs_read_alloc_scratch(struct nfs_pgio_header *hdr, size_t size); 497 extern int nfs_read_add_folio(struct nfs_pageio_descriptor *pgio, 498 struct nfs_open_context *ctx, 499 struct folio *folio); 500 extern void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio); 501 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 502 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 503 504 /* super.c */ 505 void nfs_umount_begin(struct super_block *); 506 int nfs_statfs(struct dentry *, struct kstatfs *); 507 int nfs_show_options(struct seq_file *, struct dentry *); 508 int nfs_show_devname(struct seq_file *, struct dentry *); 509 int nfs_show_path(struct seq_file *, struct dentry *); 510 int nfs_show_stats(struct seq_file *, struct dentry *); 511 int nfs_reconfigure(struct fs_context *); 512 513 /* write.c */ 514 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 515 struct inode *inode, int ioflags, bool force_mds, 516 const struct nfs_pgio_completion_ops *compl_ops); 517 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 518 extern void nfs_commit_free(struct nfs_commit_data *p); 519 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 520 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 521 struct nfs_commit_data *data, 522 const struct nfs_rpc_ops *nfs_ops, 523 const struct rpc_call_ops *call_ops, 524 int how, int flags); 525 extern void nfs_init_commit(struct nfs_commit_data *data, 526 struct list_head *head, 527 struct pnfs_layout_segment *lseg, 528 struct nfs_commit_info *cinfo); 529 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 530 struct nfs_commit_info *cinfo, int max); 531 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 532 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 533 struct nfs_commit_info *cinfo); 534 void nfs_mark_request_commit(struct nfs_page *req, 535 struct pnfs_layout_segment *lseg, 536 struct nfs_commit_info *cinfo, 537 u32 ds_commit_idx); 538 int nfs_write_need_commit(struct nfs_pgio_header *); 539 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 540 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 541 int how, struct nfs_commit_info *cinfo); 542 void nfs_retry_commit(struct list_head *page_list, 543 struct pnfs_layout_segment *lseg, 544 struct nfs_commit_info *cinfo, 545 u32 ds_commit_idx); 546 void nfs_commitdata_release(struct nfs_commit_data *data); 547 void nfs_request_add_commit_list(struct nfs_page *req, 548 struct nfs_commit_info *cinfo); 549 void nfs_request_add_commit_list_locked(struct nfs_page *req, 550 struct list_head *dst, 551 struct nfs_commit_info *cinfo); 552 void nfs_request_remove_commit_list(struct nfs_page *req, 553 struct nfs_commit_info *cinfo); 554 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 555 struct inode *inode, 556 struct nfs_direct_req *dreq); 557 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 558 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 559 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 560 561 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 562 loff_t lstart, loff_t lend); 563 564 #ifdef CONFIG_NFS_V4_1 565 static inline void 566 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets, 567 unsigned int nbuckets) 568 { 569 unsigned int i; 570 571 for (i = 0; i < nbuckets; i++) 572 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 573 } 574 static inline 575 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 576 { 577 struct pnfs_commit_array *array; 578 579 rcu_read_lock(); 580 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list) 581 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets, 582 array->nbuckets); 583 rcu_read_unlock(); 584 } 585 #else 586 static inline 587 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 588 { 589 } 590 #endif 591 592 #ifdef CONFIG_MIGRATION 593 int nfs_migrate_folio(struct address_space *, struct folio *dst, 594 struct folio *src, enum migrate_mode); 595 #else 596 #define nfs_migrate_folio NULL 597 #endif 598 599 static inline int 600 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 601 const struct nfs_write_verifier *v2) 602 { 603 return memcmp(v1->data, v2->data, sizeof(v1->data)); 604 } 605 606 static inline bool 607 nfs_write_match_verf(const struct nfs_writeverf *verf, 608 struct nfs_page *req) 609 { 610 return verf->committed > NFS_UNSTABLE && 611 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier); 612 } 613 614 static inline gfp_t nfs_io_gfp_mask(void) 615 { 616 if (current->flags & PF_WQ_WORKER) 617 return GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN; 618 return GFP_KERNEL; 619 } 620 621 /* 622 * Special version of should_remove_suid() that ignores capabilities. 623 */ 624 static inline int nfs_should_remove_suid(const struct inode *inode) 625 { 626 umode_t mode = inode->i_mode; 627 int kill = 0; 628 629 /* suid always must be killed */ 630 if (unlikely(mode & S_ISUID)) 631 kill = ATTR_KILL_SUID; 632 633 /* 634 * sgid without any exec bits is just a mandatory locking mark; leave 635 * it alone. If some exec bits are set, it's a real sgid; kill it. 636 */ 637 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) 638 kill |= ATTR_KILL_SGID; 639 640 if (unlikely(kill && S_ISREG(mode))) 641 return kill; 642 643 return 0; 644 } 645 646 /* unlink.c */ 647 extern struct rpc_task * 648 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 649 struct dentry *old_dentry, struct dentry *new_dentry, 650 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 651 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 652 653 /* direct.c */ 654 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 655 struct nfs_direct_req *dreq); 656 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq, loff_t offset); 657 658 /* nfs4proc.c */ 659 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 660 const struct nfs_client_initdata *); 661 extern int nfs40_walk_client_list(struct nfs_client *clp, 662 struct nfs_client **result, 663 const struct cred *cred); 664 extern int nfs41_walk_client_list(struct nfs_client *clp, 665 struct nfs_client **result, 666 const struct cred *cred); 667 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, 668 struct rpc_xprt *xprt, 669 void *data); 670 671 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 672 { 673 struct super_block *sb = inode->i_sb; 674 675 if (sb && nfs_sb_active(sb)) { 676 if (igrab(inode)) 677 return inode; 678 nfs_sb_deactive(sb); 679 } 680 return NULL; 681 } 682 683 static inline void nfs_iput_and_deactive(struct inode *inode) 684 { 685 if (inode != NULL) { 686 struct super_block *sb = inode->i_sb; 687 688 iput(inode); 689 nfs_sb_deactive(sb); 690 } 691 } 692 693 /* 694 * Determine the device name as a string 695 */ 696 static inline char *nfs_devname(struct dentry *dentry, 697 char *buffer, ssize_t buflen) 698 { 699 char *dummy; 700 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 701 } 702 703 /* 704 * Determine the actual block size (and log2 thereof) 705 */ 706 static inline 707 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 708 { 709 /* make sure blocksize is a power of two */ 710 if ((bsize & (bsize - 1)) || nrbitsp) { 711 unsigned char nrbits; 712 713 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 714 ; 715 bsize = 1 << nrbits; 716 if (nrbitsp) 717 *nrbitsp = nrbits; 718 } 719 720 return bsize; 721 } 722 723 /* 724 * Calculate the number of 512byte blocks used. 725 */ 726 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 727 { 728 blkcnt_t used = (tsize + 511) >> 9; 729 return (used > ULONG_MAX) ? ULONG_MAX : used; 730 } 731 732 /* 733 * Compute and set NFS server blocksize 734 */ 735 static inline 736 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 737 { 738 if (bsize < NFS_MIN_FILE_IO_SIZE) 739 bsize = NFS_DEF_FILE_IO_SIZE; 740 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 741 bsize = NFS_MAX_FILE_IO_SIZE; 742 743 return nfs_block_bits(bsize, nrbitsp); 744 } 745 746 /* 747 * Compute and set NFS server rsize / wsize 748 */ 749 static inline 750 unsigned long nfs_io_size(unsigned long iosize, enum xprt_transports proto) 751 { 752 if (iosize < NFS_MIN_FILE_IO_SIZE) 753 iosize = NFS_DEF_FILE_IO_SIZE; 754 else if (iosize >= NFS_MAX_FILE_IO_SIZE) 755 iosize = NFS_MAX_FILE_IO_SIZE; 756 757 if (proto == XPRT_TRANSPORT_UDP || iosize < PAGE_SIZE) 758 return nfs_block_bits(iosize, NULL); 759 return iosize & PAGE_MASK; 760 } 761 762 /* 763 * Determine the maximum file size for a superblock 764 */ 765 static inline 766 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 767 { 768 sb->s_maxbytes = (loff_t)maxfilesize; 769 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 770 sb->s_maxbytes = MAX_LFS_FILESIZE; 771 } 772 773 /* 774 * Record the page as unstable (an extra writeback period) and mark its 775 * inode as dirty. 776 */ 777 static inline void nfs_folio_mark_unstable(struct folio *folio, 778 struct nfs_commit_info *cinfo) 779 { 780 if (folio && !cinfo->dreq) { 781 struct inode *inode = folio_file_mapping(folio)->host; 782 long nr = folio_nr_pages(folio); 783 784 /* This page is really still in write-back - just that the 785 * writeback is happening on the server now. 786 */ 787 node_stat_mod_folio(folio, NR_WRITEBACK, nr); 788 wb_stat_mod(&inode_to_bdi(inode)->wb, WB_WRITEBACK, nr); 789 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 790 } 791 } 792 793 /* 794 * Determine the number of bytes of data the page contains 795 */ 796 static inline 797 unsigned int nfs_page_length(struct page *page) 798 { 799 loff_t i_size = i_size_read(page_file_mapping(page)->host); 800 801 if (i_size > 0) { 802 pgoff_t index = page_index(page); 803 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 804 if (index < end_index) 805 return PAGE_SIZE; 806 if (index == end_index) 807 return ((i_size - 1) & ~PAGE_MASK) + 1; 808 } 809 return 0; 810 } 811 812 /* 813 * Determine the number of bytes of data the page contains 814 */ 815 static inline size_t nfs_folio_length(struct folio *folio) 816 { 817 loff_t i_size = i_size_read(folio_file_mapping(folio)->host); 818 819 if (i_size > 0) { 820 pgoff_t index = folio_index(folio) >> folio_order(folio); 821 pgoff_t end_index = (i_size - 1) >> folio_shift(folio); 822 if (index < end_index) 823 return folio_size(folio); 824 if (index == end_index) 825 return offset_in_folio(folio, i_size - 1) + 1; 826 } 827 return 0; 828 } 829 830 /* 831 * Convert a umode to a dirent->d_type 832 */ 833 static inline 834 unsigned char nfs_umode_to_dtype(umode_t mode) 835 { 836 return (mode >> 12) & 15; 837 } 838 839 /* 840 * Determine the number of pages in an array of length 'len' and 841 * with a base offset of 'base' 842 */ 843 static inline unsigned int nfs_page_array_len(unsigned int base, size_t len) 844 { 845 return ((unsigned long)len + (unsigned long)base + PAGE_SIZE - 1) >> 846 PAGE_SHIFT; 847 } 848 849 /* 850 * Convert a struct timespec64 into a 64-bit change attribute 851 * 852 * This does approximately the same thing as timespec64_to_ns(), 853 * but for calculation efficiency, we multiply the seconds by 854 * 1024*1024*1024. 855 */ 856 static inline 857 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts) 858 { 859 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 860 } 861 862 #ifdef CONFIG_CRC32 863 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 864 { 865 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 866 NFS4_STATEID_OTHER_SIZE); 867 } 868 #else 869 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 870 { 871 return 0; 872 } 873 #endif 874 875 static inline bool nfs_error_is_fatal(int err) 876 { 877 switch (err) { 878 case -ERESTARTSYS: 879 case -EINTR: 880 case -EACCES: 881 case -EDQUOT: 882 case -EFBIG: 883 case -EIO: 884 case -ENOSPC: 885 case -EROFS: 886 case -ESTALE: 887 case -E2BIG: 888 case -ENOMEM: 889 case -ETIMEDOUT: 890 return true; 891 default: 892 return false; 893 } 894 } 895 896 static inline bool nfs_error_is_fatal_on_server(int err) 897 { 898 switch (err) { 899 case 0: 900 case -ERESTARTSYS: 901 case -EINTR: 902 case -ENOMEM: 903 return false; 904 } 905 return nfs_error_is_fatal(err); 906 } 907 908 /* 909 * Select between a default port value and a user-specified port value. 910 * If a zero value is set, then autobind will be used. 911 */ 912 static inline void nfs_set_port(struct sockaddr_storage *sap, int *port, 913 const unsigned short default_port) 914 { 915 if (*port == NFS_UNSPEC_PORT) 916 *port = default_port; 917 918 rpc_set_port((struct sockaddr *)sap, *port); 919 } 920 921 struct nfs_direct_req { 922 struct kref kref; /* release manager */ 923 924 /* I/O parameters */ 925 struct nfs_open_context *ctx; /* file open context info */ 926 struct nfs_lock_context *l_ctx; /* Lock context info */ 927 struct kiocb * iocb; /* controlling i/o request */ 928 struct inode * inode; /* target file of i/o */ 929 930 /* completion state */ 931 atomic_t io_count; /* i/os we're waiting for */ 932 spinlock_t lock; /* protect completion state */ 933 934 loff_t io_start; /* Start offset for I/O */ 935 ssize_t count, /* bytes actually processed */ 936 max_count, /* max expected count */ 937 error; /* any reported error */ 938 struct completion completion; /* wait for i/o completion */ 939 940 /* commit state */ 941 struct nfs_mds_commit_info mds_cinfo; /* Storage for cinfo */ 942 struct pnfs_ds_commit_info ds_cinfo; /* Storage for cinfo */ 943 struct work_struct work; 944 int flags; 945 /* for write */ 946 #define NFS_ODIRECT_DO_COMMIT (1) /* an unstable reply was received */ 947 #define NFS_ODIRECT_RESCHED_WRITES (2) /* write verification failed */ 948 /* for read */ 949 #define NFS_ODIRECT_SHOULD_DIRTY (3) /* dirty user-space page after read */ 950 #define NFS_ODIRECT_DONE INT_MAX /* write verification failed */ 951 }; 952