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 struct rpc_stat nfs_rpcstat; 453 454 extern int __init register_nfs_fs(void); 455 extern void __exit unregister_nfs_fs(void); 456 extern bool nfs_sb_active(struct super_block *sb); 457 extern void nfs_sb_deactive(struct super_block *sb); 458 extern int nfs_client_for_each_server(struct nfs_client *clp, 459 int (*fn)(struct nfs_server *, void *), 460 void *data); 461 #ifdef CONFIG_NFS_FSCACHE 462 extern const struct netfs_request_ops nfs_netfs_ops; 463 #endif 464 465 /* io.c */ 466 extern void nfs_start_io_read(struct inode *inode); 467 extern void nfs_end_io_read(struct inode *inode); 468 extern void nfs_start_io_write(struct inode *inode); 469 extern void nfs_end_io_write(struct inode *inode); 470 extern void nfs_start_io_direct(struct inode *inode); 471 extern void nfs_end_io_direct(struct inode *inode); 472 473 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 474 { 475 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 476 } 477 478 /* namespace.c */ 479 #define NFS_PATH_CANONICAL 1 480 extern char *nfs_path(char **p, struct dentry *dentry, 481 char *buffer, ssize_t buflen, unsigned flags); 482 extern struct vfsmount *nfs_d_automount(struct path *path); 483 int nfs_submount(struct fs_context *, struct nfs_server *); 484 int nfs_do_submount(struct fs_context *); 485 486 /* getroot.c */ 487 extern int nfs_get_root(struct super_block *s, struct fs_context *fc); 488 #if IS_ENABLED(CONFIG_NFS_V4) 489 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 490 #endif 491 492 struct nfs_pgio_completion_ops; 493 /* read.c */ 494 extern const struct nfs_pgio_completion_ops nfs_async_read_completion_ops; 495 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 496 struct inode *inode, bool force_mds, 497 const struct nfs_pgio_completion_ops *compl_ops); 498 extern bool nfs_read_alloc_scratch(struct nfs_pgio_header *hdr, size_t size); 499 extern int nfs_read_add_folio(struct nfs_pageio_descriptor *pgio, 500 struct nfs_open_context *ctx, 501 struct folio *folio); 502 extern void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio); 503 extern void nfs_read_prepare(struct rpc_task *task, void *calldata); 504 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 505 506 /* super.c */ 507 void nfs_umount_begin(struct super_block *); 508 int nfs_statfs(struct dentry *, struct kstatfs *); 509 int nfs_show_options(struct seq_file *, struct dentry *); 510 int nfs_show_devname(struct seq_file *, struct dentry *); 511 int nfs_show_path(struct seq_file *, struct dentry *); 512 int nfs_show_stats(struct seq_file *, struct dentry *); 513 int nfs_reconfigure(struct fs_context *); 514 515 /* write.c */ 516 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 517 struct inode *inode, int ioflags, bool force_mds, 518 const struct nfs_pgio_completion_ops *compl_ops); 519 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 520 extern void nfs_commit_free(struct nfs_commit_data *p); 521 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 522 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 523 struct nfs_commit_data *data, 524 const struct nfs_rpc_ops *nfs_ops, 525 const struct rpc_call_ops *call_ops, 526 int how, int flags); 527 extern void nfs_init_commit(struct nfs_commit_data *data, 528 struct list_head *head, 529 struct pnfs_layout_segment *lseg, 530 struct nfs_commit_info *cinfo); 531 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 532 struct nfs_commit_info *cinfo, int max); 533 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 534 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 535 struct nfs_commit_info *cinfo); 536 void nfs_mark_request_commit(struct nfs_page *req, 537 struct pnfs_layout_segment *lseg, 538 struct nfs_commit_info *cinfo, 539 u32 ds_commit_idx); 540 int nfs_write_need_commit(struct nfs_pgio_header *); 541 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 542 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 543 int how, struct nfs_commit_info *cinfo); 544 void nfs_retry_commit(struct list_head *page_list, 545 struct pnfs_layout_segment *lseg, 546 struct nfs_commit_info *cinfo, 547 u32 ds_commit_idx); 548 void nfs_commitdata_release(struct nfs_commit_data *data); 549 void nfs_request_add_commit_list(struct nfs_page *req, 550 struct nfs_commit_info *cinfo); 551 void nfs_request_add_commit_list_locked(struct nfs_page *req, 552 struct list_head *dst, 553 struct nfs_commit_info *cinfo); 554 void nfs_request_remove_commit_list(struct nfs_page *req, 555 struct nfs_commit_info *cinfo); 556 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 557 struct inode *inode, 558 struct nfs_direct_req *dreq); 559 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 560 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 561 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 562 563 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 564 loff_t lstart, loff_t lend); 565 566 #ifdef CONFIG_NFS_V4_1 567 static inline void 568 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets, 569 unsigned int nbuckets) 570 { 571 unsigned int i; 572 573 for (i = 0; i < nbuckets; i++) 574 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 575 } 576 static inline 577 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 578 { 579 struct pnfs_commit_array *array; 580 581 rcu_read_lock(); 582 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list) 583 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets, 584 array->nbuckets); 585 rcu_read_unlock(); 586 } 587 #else 588 static inline 589 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 590 { 591 } 592 #endif 593 594 #ifdef CONFIG_MIGRATION 595 int nfs_migrate_folio(struct address_space *, struct folio *dst, 596 struct folio *src, enum migrate_mode); 597 #else 598 #define nfs_migrate_folio NULL 599 #endif 600 601 static inline int 602 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 603 const struct nfs_write_verifier *v2) 604 { 605 return memcmp(v1->data, v2->data, sizeof(v1->data)); 606 } 607 608 static inline bool 609 nfs_write_match_verf(const struct nfs_writeverf *verf, 610 struct nfs_page *req) 611 { 612 return verf->committed > NFS_UNSTABLE && 613 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier); 614 } 615 616 static inline gfp_t nfs_io_gfp_mask(void) 617 { 618 if (current->flags & PF_WQ_WORKER) 619 return GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN; 620 return GFP_KERNEL; 621 } 622 623 /* 624 * Special version of should_remove_suid() that ignores capabilities. 625 */ 626 static inline int nfs_should_remove_suid(const struct inode *inode) 627 { 628 umode_t mode = inode->i_mode; 629 int kill = 0; 630 631 /* suid always must be killed */ 632 if (unlikely(mode & S_ISUID)) 633 kill = ATTR_KILL_SUID; 634 635 /* 636 * sgid without any exec bits is just a mandatory locking mark; leave 637 * it alone. If some exec bits are set, it's a real sgid; kill it. 638 */ 639 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) 640 kill |= ATTR_KILL_SGID; 641 642 if (unlikely(kill && S_ISREG(mode))) 643 return kill; 644 645 return 0; 646 } 647 648 /* unlink.c */ 649 extern struct rpc_task * 650 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 651 struct dentry *old_dentry, struct dentry *new_dentry, 652 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 653 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 654 655 /* direct.c */ 656 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 657 struct nfs_direct_req *dreq); 658 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq, loff_t offset); 659 660 /* nfs4proc.c */ 661 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 662 const struct nfs_client_initdata *); 663 extern int nfs40_walk_client_list(struct nfs_client *clp, 664 struct nfs_client **result, 665 const struct cred *cred); 666 extern int nfs41_walk_client_list(struct nfs_client *clp, 667 struct nfs_client **result, 668 const struct cred *cred); 669 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, 670 struct rpc_xprt *xprt, 671 void *data); 672 673 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 674 { 675 struct super_block *sb = inode->i_sb; 676 677 if (sb && nfs_sb_active(sb)) { 678 if (igrab(inode)) 679 return inode; 680 nfs_sb_deactive(sb); 681 } 682 return NULL; 683 } 684 685 static inline void nfs_iput_and_deactive(struct inode *inode) 686 { 687 if (inode != NULL) { 688 struct super_block *sb = inode->i_sb; 689 690 iput(inode); 691 nfs_sb_deactive(sb); 692 } 693 } 694 695 /* 696 * Determine the device name as a string 697 */ 698 static inline char *nfs_devname(struct dentry *dentry, 699 char *buffer, ssize_t buflen) 700 { 701 char *dummy; 702 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 703 } 704 705 /* 706 * Determine the actual block size (and log2 thereof) 707 */ 708 static inline 709 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 710 { 711 /* make sure blocksize is a power of two */ 712 if ((bsize & (bsize - 1)) || nrbitsp) { 713 unsigned char nrbits; 714 715 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--) 716 ; 717 bsize = 1 << nrbits; 718 if (nrbitsp) 719 *nrbitsp = nrbits; 720 } 721 722 return bsize; 723 } 724 725 /* 726 * Calculate the number of 512byte blocks used. 727 */ 728 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 729 { 730 blkcnt_t used = (tsize + 511) >> 9; 731 return (used > ULONG_MAX) ? ULONG_MAX : used; 732 } 733 734 /* 735 * Compute and set NFS server blocksize 736 */ 737 static inline 738 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 739 { 740 if (bsize < NFS_MIN_FILE_IO_SIZE) 741 bsize = NFS_DEF_FILE_IO_SIZE; 742 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 743 bsize = NFS_MAX_FILE_IO_SIZE; 744 745 return nfs_block_bits(bsize, nrbitsp); 746 } 747 748 /* 749 * Compute and set NFS server rsize / wsize 750 */ 751 static inline 752 unsigned long nfs_io_size(unsigned long iosize, enum xprt_transports proto) 753 { 754 if (iosize < NFS_MIN_FILE_IO_SIZE) 755 iosize = NFS_DEF_FILE_IO_SIZE; 756 else if (iosize >= NFS_MAX_FILE_IO_SIZE) 757 iosize = NFS_MAX_FILE_IO_SIZE; 758 759 if (proto == XPRT_TRANSPORT_UDP || iosize < PAGE_SIZE) 760 return nfs_block_bits(iosize, NULL); 761 return iosize & PAGE_MASK; 762 } 763 764 /* 765 * Determine the maximum file size for a superblock 766 */ 767 static inline 768 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 769 { 770 sb->s_maxbytes = (loff_t)maxfilesize; 771 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 772 sb->s_maxbytes = MAX_LFS_FILESIZE; 773 } 774 775 /* 776 * Record the page as unstable (an extra writeback period) and mark its 777 * inode as dirty. 778 */ 779 static inline void nfs_folio_mark_unstable(struct folio *folio, 780 struct nfs_commit_info *cinfo) 781 { 782 if (folio && !cinfo->dreq) { 783 struct inode *inode = folio_file_mapping(folio)->host; 784 long nr = folio_nr_pages(folio); 785 786 /* This page is really still in write-back - just that the 787 * writeback is happening on the server now. 788 */ 789 node_stat_mod_folio(folio, NR_WRITEBACK, nr); 790 wb_stat_mod(&inode_to_bdi(inode)->wb, WB_WRITEBACK, nr); 791 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 792 } 793 } 794 795 /* 796 * Determine the number of bytes of data the page contains 797 */ 798 static inline 799 unsigned int nfs_page_length(struct page *page) 800 { 801 loff_t i_size = i_size_read(page_file_mapping(page)->host); 802 803 if (i_size > 0) { 804 pgoff_t index = page_index(page); 805 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT; 806 if (index < end_index) 807 return PAGE_SIZE; 808 if (index == end_index) 809 return ((i_size - 1) & ~PAGE_MASK) + 1; 810 } 811 return 0; 812 } 813 814 /* 815 * Determine the number of bytes of data the page contains 816 */ 817 static inline size_t nfs_folio_length(struct folio *folio) 818 { 819 loff_t i_size = i_size_read(folio_file_mapping(folio)->host); 820 821 if (i_size > 0) { 822 pgoff_t index = folio_index(folio) >> folio_order(folio); 823 pgoff_t end_index = (i_size - 1) >> folio_shift(folio); 824 if (index < end_index) 825 return folio_size(folio); 826 if (index == end_index) 827 return offset_in_folio(folio, i_size - 1) + 1; 828 } 829 return 0; 830 } 831 832 /* 833 * Convert a umode to a dirent->d_type 834 */ 835 static inline 836 unsigned char nfs_umode_to_dtype(umode_t mode) 837 { 838 return (mode >> 12) & 15; 839 } 840 841 /* 842 * Determine the number of pages in an array of length 'len' and 843 * with a base offset of 'base' 844 */ 845 static inline unsigned int nfs_page_array_len(unsigned int base, size_t len) 846 { 847 return ((unsigned long)len + (unsigned long)base + PAGE_SIZE - 1) >> 848 PAGE_SHIFT; 849 } 850 851 /* 852 * Convert a struct timespec64 into a 64-bit change attribute 853 * 854 * This does approximately the same thing as timespec64_to_ns(), 855 * but for calculation efficiency, we multiply the seconds by 856 * 1024*1024*1024. 857 */ 858 static inline 859 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts) 860 { 861 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 862 } 863 864 #ifdef CONFIG_CRC32 865 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 866 { 867 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 868 NFS4_STATEID_OTHER_SIZE); 869 } 870 #else 871 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 872 { 873 return 0; 874 } 875 #endif 876 877 static inline bool nfs_error_is_fatal(int err) 878 { 879 switch (err) { 880 case -ERESTARTSYS: 881 case -EINTR: 882 case -EACCES: 883 case -EDQUOT: 884 case -EFBIG: 885 case -EIO: 886 case -ENOSPC: 887 case -EROFS: 888 case -ESTALE: 889 case -E2BIG: 890 case -ENOMEM: 891 case -ETIMEDOUT: 892 return true; 893 default: 894 return false; 895 } 896 } 897 898 static inline bool nfs_error_is_fatal_on_server(int err) 899 { 900 switch (err) { 901 case 0: 902 case -ERESTARTSYS: 903 case -EINTR: 904 case -ENOMEM: 905 return false; 906 } 907 return nfs_error_is_fatal(err); 908 } 909 910 /* 911 * Select between a default port value and a user-specified port value. 912 * If a zero value is set, then autobind will be used. 913 */ 914 static inline void nfs_set_port(struct sockaddr_storage *sap, int *port, 915 const unsigned short default_port) 916 { 917 if (*port == NFS_UNSPEC_PORT) 918 *port = default_port; 919 920 rpc_set_port((struct sockaddr *)sap, *port); 921 } 922 923 struct nfs_direct_req { 924 struct kref kref; /* release manager */ 925 926 /* I/O parameters */ 927 struct nfs_open_context *ctx; /* file open context info */ 928 struct nfs_lock_context *l_ctx; /* Lock context info */ 929 struct kiocb * iocb; /* controlling i/o request */ 930 struct inode * inode; /* target file of i/o */ 931 932 /* completion state */ 933 atomic_t io_count; /* i/os we're waiting for */ 934 spinlock_t lock; /* protect completion state */ 935 936 loff_t io_start; /* Start offset for I/O */ 937 ssize_t count, /* bytes actually processed */ 938 max_count, /* max expected count */ 939 bytes_left, /* bytes left to be sent */ 940 error; /* any reported error */ 941 struct completion completion; /* wait for i/o completion */ 942 943 /* commit state */ 944 struct nfs_mds_commit_info mds_cinfo; /* Storage for cinfo */ 945 struct pnfs_ds_commit_info ds_cinfo; /* Storage for cinfo */ 946 struct work_struct work; 947 int flags; 948 /* for write */ 949 #define NFS_ODIRECT_DO_COMMIT (1) /* an unstable reply was received */ 950 #define NFS_ODIRECT_RESCHED_WRITES (2) /* write verification failed */ 951 /* for read */ 952 #define NFS_ODIRECT_SHOULD_DIRTY (3) /* dirty user-space page after read */ 953 #define NFS_ODIRECT_DONE INT_MAX /* write verification failed */ 954 }; 955