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/nfslocalio.h> 13 #include <linux/wait_bit.h> 14 15 #define NFS_SB_MASK (SB_RDONLY|SB_NOSUID|SB_NODEV|SB_NOEXEC|SB_SYNCHRONOUS) 16 17 extern const struct export_operations nfs_export_ops; 18 19 struct nfs_string; 20 struct nfs_pageio_descriptor; 21 nfs_attr_check_mountpoint(struct super_block * parent,struct nfs_fattr * fattr)22 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr) 23 { 24 if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid)) 25 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT; 26 } 27 nfs_attr_use_mounted_on_fileid(struct nfs_fattr * fattr)28 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr) 29 { 30 if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) || 31 (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) && 32 ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0))) 33 return 0; 34 return 1; 35 } 36 nfs_lookup_is_soft_revalidate(const struct dentry * dentry)37 static inline bool nfs_lookup_is_soft_revalidate(const struct dentry *dentry) 38 { 39 if (!(NFS_SB(dentry->d_sb)->flags & NFS_MOUNT_SOFTREVAL)) 40 return false; 41 if (!d_is_positive(dentry) || !NFS_FH(d_inode(dentry))->size) 42 return false; 43 return true; 44 } 45 flags_to_mode(int flags)46 static inline fmode_t flags_to_mode(int flags) 47 { 48 fmode_t res = (__force fmode_t)flags & FMODE_EXEC; 49 if ((flags & O_ACCMODE) != O_WRONLY) 50 res |= FMODE_READ; 51 if ((flags & O_ACCMODE) != O_RDONLY) 52 res |= FMODE_WRITE; 53 return res; 54 } 55 56 /* 57 * Note: RFC 1813 doesn't limit the number of auth flavors that 58 * a server can return, so make something up. 59 */ 60 #define NFS_MAX_SECFLAVORS (12) 61 62 /* 63 * Value used if the user did not specify a port value. 64 */ 65 #define NFS_UNSPEC_PORT (-1) 66 67 #define NFS_UNSPEC_RETRANS (UINT_MAX) 68 #define NFS_UNSPEC_TIMEO (UINT_MAX) 69 70 struct nfs_client_initdata { 71 unsigned long init_flags; 72 const char *hostname; /* Hostname of the server */ 73 const struct sockaddr_storage *addr; /* Address of the server */ 74 const char *nodename; /* Hostname of the client */ 75 const char *ip_addr; /* IP address of the client */ 76 size_t addrlen; 77 struct nfs_subversion *nfs_mod; 78 int proto; 79 u32 minorversion; 80 unsigned int nconnect; 81 unsigned int max_connect; 82 struct net *net; 83 const struct rpc_timeout *timeparms; 84 const struct cred *cred; 85 struct xprtsec_parms xprtsec; 86 unsigned long connect_timeout; 87 unsigned long reconnect_timeout; 88 }; 89 90 /* 91 * In-kernel mount arguments 92 */ 93 struct nfs_fs_context { 94 bool internal; 95 bool skip_reconfig_option_check; 96 bool need_mount; 97 bool sloppy; 98 unsigned int flags; /* NFS{,4}_MOUNT_* flags */ 99 unsigned int rsize, wsize; 100 unsigned int timeo, retrans; 101 unsigned int acregmin, acregmax; 102 unsigned int acdirmin, acdirmax; 103 unsigned int namlen; 104 unsigned int options; 105 unsigned int bsize; 106 struct nfs_auth_info auth_info; 107 rpc_authflavor_t selected_flavor; 108 struct xprtsec_parms xprtsec; 109 char *client_address; 110 unsigned int version; 111 unsigned int minorversion; 112 char *fscache_uniq; 113 unsigned short protofamily; 114 unsigned short mountfamily; 115 bool has_sec_mnt_opts; 116 int lock_status; 117 118 struct { 119 union { 120 struct sockaddr address; 121 struct sockaddr_storage _address; 122 }; 123 size_t addrlen; 124 char *hostname; 125 u32 version; 126 int port; 127 unsigned short protocol; 128 } mount_server; 129 130 struct { 131 union { 132 struct sockaddr address; 133 struct sockaddr_storage _address; 134 }; 135 size_t addrlen; 136 char *hostname; 137 char *export_path; 138 int port; 139 unsigned short protocol; 140 unsigned short nconnect; 141 unsigned short max_connect; 142 unsigned short export_path_len; 143 } nfs_server; 144 145 struct nfs_fh *mntfh; 146 struct nfs_server *server; 147 struct nfs_subversion *nfs_mod; 148 149 /* Information for a cloned mount. */ 150 struct nfs_clone_mount { 151 struct super_block *sb; 152 struct dentry *dentry; 153 struct nfs_fattr *fattr; 154 unsigned int inherited_bsize; 155 } clone_data; 156 }; 157 158 enum nfs_lock_status { 159 NFS_LOCK_NOT_SET = 0, 160 NFS_LOCK_LOCK = 1, 161 NFS_LOCK_NOLOCK = 2, 162 }; 163 164 #define nfs_errorf(fc, fmt, ...) ((fc)->log.log ? \ 165 errorf(fc, fmt, ## __VA_ARGS__) : \ 166 ({ dprintk(fmt "\n", ## __VA_ARGS__); })) 167 168 #define nfs_ferrorf(fc, fac, fmt, ...) ((fc)->log.log ? \ 169 errorf(fc, fmt, ## __VA_ARGS__) : \ 170 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); })) 171 172 #define nfs_invalf(fc, fmt, ...) ((fc)->log.log ? \ 173 invalf(fc, fmt, ## __VA_ARGS__) : \ 174 ({ dprintk(fmt "\n", ## __VA_ARGS__); -EINVAL; })) 175 176 #define nfs_finvalf(fc, fac, fmt, ...) ((fc)->log.log ? \ 177 invalf(fc, fmt, ## __VA_ARGS__) : \ 178 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); -EINVAL; })) 179 180 #define nfs_warnf(fc, fmt, ...) ((fc)->log.log ? \ 181 warnf(fc, fmt, ## __VA_ARGS__) : \ 182 ({ dprintk(fmt "\n", ## __VA_ARGS__); })) 183 184 #define nfs_fwarnf(fc, fac, fmt, ...) ((fc)->log.log ? \ 185 warnf(fc, fmt, ## __VA_ARGS__) : \ 186 ({ dfprintk(fac, fmt "\n", ## __VA_ARGS__); })) 187 nfs_fc2context(const struct fs_context * fc)188 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc) 189 { 190 return fc->fs_private; 191 } 192 193 /* mount_clnt.c */ 194 struct nfs_mount_request { 195 struct sockaddr_storage *sap; 196 size_t salen; 197 char *hostname; 198 char *dirpath; 199 u32 version; 200 unsigned short protocol; 201 struct nfs_fh *fh; 202 int noresvport; 203 unsigned int *auth_flav_len; 204 rpc_authflavor_t *auth_flavs; 205 struct net *net; 206 }; 207 208 extern int nfs_mount(struct nfs_mount_request *info, int timeo, int retrans); 209 extern void nfs_umount(const struct nfs_mount_request *info); 210 211 /* client.c */ 212 extern const struct rpc_program nfs_program; 213 extern void nfs_clients_init(struct net *net); 214 extern void nfs_clients_exit(struct net *net); 215 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *); 216 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t); 217 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *); 218 int nfs_probe_server(struct nfs_server *, struct nfs_fh *); 219 void nfs_server_insert_lists(struct nfs_server *); 220 void nfs_server_remove_lists(struct nfs_server *); 221 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans); 222 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t, 223 rpc_authflavor_t); 224 struct nfs_server *nfs_alloc_server(void); 225 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *); 226 227 extern void nfs_put_client(struct nfs_client *); 228 extern void nfs_free_client(struct nfs_client *); 229 extern struct nfs_client *nfs4_find_client_ident(struct net *, int); 230 extern struct nfs_client * 231 nfs4_find_client_sessionid(struct net *, const struct sockaddr *, 232 struct nfs4_sessionid *, u32); 233 extern struct nfs_server *nfs_create_server(struct fs_context *); 234 extern void nfs4_server_set_init_caps(struct nfs_server *); 235 extern struct nfs_server *nfs4_create_server(struct fs_context *); 236 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *); 237 extern int nfs4_update_server(struct nfs_server *server, const char *hostname, 238 struct sockaddr_storage *sap, size_t salen, 239 struct net *net); 240 extern void nfs_free_server(struct nfs_server *server); 241 extern struct nfs_server *nfs_clone_server(struct nfs_server *, 242 struct nfs_fh *, 243 struct nfs_fattr *, 244 rpc_authflavor_t); 245 extern bool nfs_client_init_is_complete(const struct nfs_client *clp); 246 extern int nfs_client_init_status(const struct nfs_client *clp); 247 extern int nfs_wait_client_init_complete(const struct nfs_client *clp); 248 extern void nfs_mark_client_ready(struct nfs_client *clp, int state); 249 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 250 const struct sockaddr_storage *ds_addr, 251 int ds_addrlen, int ds_proto, 252 unsigned int ds_timeo, 253 unsigned int ds_retrans, 254 u32 minor_version); 255 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *, 256 struct inode *); 257 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv, 258 const struct sockaddr_storage *ds_addr, int ds_addrlen, 259 int ds_proto, unsigned int ds_timeo, 260 unsigned int ds_retrans); 261 #ifdef CONFIG_PROC_FS 262 extern int __init nfs_fs_proc_init(void); 263 extern void nfs_fs_proc_exit(void); 264 extern int nfs_fs_proc_net_init(struct net *net); 265 extern void nfs_fs_proc_net_exit(struct net *net); 266 #else nfs_fs_proc_net_init(struct net * net)267 static inline int nfs_fs_proc_net_init(struct net *net) 268 { 269 return 0; 270 } nfs_fs_proc_net_exit(struct net * net)271 static inline void nfs_fs_proc_net_exit(struct net *net) 272 { 273 } nfs_fs_proc_init(void)274 static inline int nfs_fs_proc_init(void) 275 { 276 return 0; 277 } nfs_fs_proc_exit(void)278 static inline void nfs_fs_proc_exit(void) 279 { 280 } 281 #endif 282 283 /* callback_xdr.c */ 284 extern const struct svc_version nfs4_callback_version1; 285 extern const struct svc_version nfs4_callback_version4; 286 287 /* fs_context.c */ 288 extern struct file_system_type nfs_fs_type; 289 290 /* pagelist.c */ 291 extern int __init nfs_init_nfspagecache(void); 292 extern void nfs_destroy_nfspagecache(void); 293 extern int __init nfs_init_readpagecache(void); 294 extern void nfs_destroy_readpagecache(void); 295 extern int __init nfs_init_writepagecache(void); 296 extern void nfs_destroy_writepagecache(void); 297 298 extern int __init nfs_init_directcache(void); 299 extern void nfs_destroy_directcache(void); 300 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, 301 struct nfs_pgio_header *hdr, 302 void (*release)(struct nfs_pgio_header *hdr)); 303 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos); 304 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx); 305 306 extern const struct nfs_pageio_ops nfs_pgio_rw_ops; 307 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *); 308 void nfs_pgio_header_free(struct nfs_pgio_header *); 309 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *); 310 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, 311 const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, 312 const struct rpc_call_ops *call_ops, int how, int flags, 313 struct nfsd_file *localio); 314 void nfs_free_request(struct nfs_page *req); 315 struct nfs_pgio_mirror * 316 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc); 317 nfs_match_open_context(const struct nfs_open_context * ctx1,const struct nfs_open_context * ctx2)318 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1, 319 const struct nfs_open_context *ctx2) 320 { 321 return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state; 322 } 323 324 /* nfs2xdr.c */ 325 extern const struct rpc_procinfo nfs_procedures[]; 326 extern int nfs2_decode_dirent(struct xdr_stream *, 327 struct nfs_entry *, bool); 328 329 /* nfs3xdr.c */ 330 extern const struct rpc_procinfo nfs3_procedures[]; 331 extern int nfs3_decode_dirent(struct xdr_stream *, 332 struct nfs_entry *, bool); 333 334 /* nfs4xdr.c */ 335 #if IS_ENABLED(CONFIG_NFS_V4) 336 extern int nfs4_decode_dirent(struct xdr_stream *, 337 struct nfs_entry *, bool); 338 #endif 339 #ifdef CONFIG_NFS_V4_1 340 extern const u32 nfs41_maxread_overhead; 341 extern const u32 nfs41_maxwrite_overhead; 342 extern const u32 nfs41_maxgetdevinfo_overhead; 343 #endif 344 345 /* nfs4proc.c */ 346 #if IS_ENABLED(CONFIG_NFS_V4) 347 extern const struct rpc_procinfo nfs4_procedures[]; 348 #endif 349 350 #ifdef CONFIG_NFS_V4_SECURITY_LABEL 351 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags); 352 static inline struct nfs4_label * nfs4_label_copy(struct nfs4_label * dst,struct nfs4_label * src)353 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 354 { 355 if (!dst || !src) 356 return NULL; 357 358 if (src->len > NFS4_MAXLABELLEN) 359 return NULL; 360 361 dst->lfs = src->lfs; 362 dst->pi = src->pi; 363 dst->len = src->len; 364 memcpy(dst->label, src->label, src->len); 365 366 return dst; 367 } 368 nfs_zap_label_cache_locked(struct nfs_inode * nfsi)369 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 370 { 371 if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL)) 372 nfsi->cache_validity |= NFS_INO_INVALID_LABEL; 373 } 374 #else nfs4_label_alloc(struct nfs_server * server,gfp_t flags)375 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; } nfs_zap_label_cache_locked(struct nfs_inode * nfsi)376 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi) 377 { 378 } 379 static inline struct nfs4_label * nfs4_label_copy(struct nfs4_label * dst,struct nfs4_label * src)380 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src) 381 { 382 return NULL; 383 } 384 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */ 385 386 /* proc.c */ 387 void nfs_close_context(struct nfs_open_context *ctx, int is_sync); 388 extern struct nfs_client *nfs_init_client(struct nfs_client *clp, 389 const struct nfs_client_initdata *); 390 391 /* dir.c */ 392 extern void nfs_readdir_record_entry_cache_hit(struct inode *dir); 393 extern void nfs_readdir_record_entry_cache_miss(struct inode *dir); 394 extern unsigned long nfs_access_cache_count(struct shrinker *shrink, 395 struct shrink_control *sc); 396 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink, 397 struct shrink_control *sc); 398 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int); 399 void nfs_d_prune_case_insensitive_aliases(struct inode *inode); 400 int nfs_create(struct mnt_idmap *, struct inode *, struct dentry *, 401 umode_t, bool); 402 int nfs_mkdir(struct mnt_idmap *, struct inode *, struct dentry *, 403 umode_t); 404 int nfs_rmdir(struct inode *, struct dentry *); 405 int nfs_unlink(struct inode *, struct dentry *); 406 int nfs_symlink(struct mnt_idmap *, struct inode *, struct dentry *, 407 const char *); 408 int nfs_link(struct dentry *, struct inode *, struct dentry *); 409 int nfs_mknod(struct mnt_idmap *, struct inode *, struct dentry *, umode_t, 410 dev_t); 411 int nfs_rename(struct mnt_idmap *, struct inode *, struct dentry *, 412 struct inode *, struct dentry *, unsigned int); 413 414 #ifdef CONFIG_NFS_V4_2 nfs_access_xattr_mask(const struct nfs_server * server)415 static inline __u32 nfs_access_xattr_mask(const struct nfs_server *server) 416 { 417 if (!(server->caps & NFS_CAP_XATTR)) 418 return 0; 419 return NFS4_ACCESS_XAREAD | NFS4_ACCESS_XAWRITE | NFS4_ACCESS_XALIST; 420 } 421 #else nfs_access_xattr_mask(const struct nfs_server * server)422 static inline __u32 nfs_access_xattr_mask(const struct nfs_server *server) 423 { 424 return 0; 425 } 426 #endif 427 428 /* file.c */ 429 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 430 loff_t nfs_file_llseek(struct file *, loff_t, int); 431 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 432 ssize_t nfs_file_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, 433 size_t len, unsigned int flags); 434 int nfs_file_mmap(struct file *, struct vm_area_struct *); 435 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 436 int nfs_file_release(struct inode *, struct file *); 437 int nfs_lock(struct file *, int, struct file_lock *); 438 int nfs_flock(struct file *, int, struct file_lock *); 439 int nfs_check_flags(int); 440 441 /* inode.c */ 442 extern struct workqueue_struct *nfsiod_workqueue; 443 extern struct workqueue_struct *nfslocaliod_workqueue; 444 extern struct inode *nfs_alloc_inode(struct super_block *sb); 445 extern void nfs_free_inode(struct inode *); 446 extern int nfs_write_inode(struct inode *, struct writeback_control *); 447 extern int nfs_drop_inode(struct inode *); 448 extern void nfs_clear_inode(struct inode *); 449 extern void nfs_evict_inode(struct inode *); 450 extern void nfs_zap_acl_cache(struct inode *inode); 451 extern void nfs_set_cache_invalid(struct inode *inode, unsigned long flags); 452 extern bool nfs_check_cache_invalid(struct inode *, unsigned long); 453 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode); 454 455 #if IS_ENABLED(CONFIG_NFS_LOCALIO) 456 /* localio.c */ 457 extern void nfs_local_disable(struct nfs_client *); 458 extern void nfs_local_probe(struct nfs_client *); 459 extern struct nfsd_file *nfs_local_open_fh(struct nfs_client *, 460 const struct cred *, 461 struct nfs_fh *, 462 const fmode_t); 463 extern int nfs_local_doio(struct nfs_client *, 464 struct nfsd_file *, 465 struct nfs_pgio_header *, 466 const struct rpc_call_ops *); 467 extern int nfs_local_commit(struct nfsd_file *, 468 struct nfs_commit_data *, 469 const struct rpc_call_ops *, int); 470 extern bool nfs_server_is_local(const struct nfs_client *clp); 471 472 #else /* CONFIG_NFS_LOCALIO */ nfs_local_disable(struct nfs_client * clp)473 static inline void nfs_local_disable(struct nfs_client *clp) {} nfs_local_probe(struct nfs_client * clp)474 static inline void nfs_local_probe(struct nfs_client *clp) {} 475 static inline struct nfsd_file * nfs_local_open_fh(struct nfs_client * clp,const struct cred * cred,struct nfs_fh * fh,const fmode_t mode)476 nfs_local_open_fh(struct nfs_client *clp, const struct cred *cred, 477 struct nfs_fh *fh, const fmode_t mode) 478 { 479 return NULL; 480 } nfs_local_doio(struct nfs_client * clp,struct nfsd_file * localio,struct nfs_pgio_header * hdr,const struct rpc_call_ops * call_ops)481 static inline int nfs_local_doio(struct nfs_client *clp, 482 struct nfsd_file *localio, 483 struct nfs_pgio_header *hdr, 484 const struct rpc_call_ops *call_ops) 485 { 486 return -EINVAL; 487 } nfs_local_commit(struct nfsd_file * localio,struct nfs_commit_data * data,const struct rpc_call_ops * call_ops,int how)488 static inline int nfs_local_commit(struct nfsd_file *localio, 489 struct nfs_commit_data *data, 490 const struct rpc_call_ops *call_ops, int how) 491 { 492 return -EINVAL; 493 } nfs_server_is_local(const struct nfs_client * clp)494 static inline bool nfs_server_is_local(const struct nfs_client *clp) 495 { 496 return false; 497 } 498 #endif /* CONFIG_NFS_LOCALIO */ 499 500 /* super.c */ 501 extern const struct super_operations nfs_sops; 502 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t); 503 int nfs_try_get_tree(struct fs_context *); 504 int nfs_get_tree_common(struct fs_context *); 505 void nfs_kill_super(struct super_block *); 506 507 extern int __init register_nfs_fs(void); 508 extern void __exit unregister_nfs_fs(void); 509 extern bool nfs_sb_active(struct super_block *sb); 510 extern void nfs_sb_deactive(struct super_block *sb); 511 extern int nfs_client_for_each_server(struct nfs_client *clp, 512 int (*fn)(struct nfs_server *, void *), 513 void *data); 514 #ifdef CONFIG_NFS_FSCACHE 515 extern const struct netfs_request_ops nfs_netfs_ops; 516 #endif 517 518 /* io.c */ 519 extern void nfs_start_io_read(struct inode *inode); 520 extern void nfs_end_io_read(struct inode *inode); 521 extern void nfs_start_io_write(struct inode *inode); 522 extern void nfs_end_io_write(struct inode *inode); 523 extern void nfs_start_io_direct(struct inode *inode); 524 extern void nfs_end_io_direct(struct inode *inode); 525 nfs_file_io_is_buffered(struct nfs_inode * nfsi)526 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi) 527 { 528 return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0; 529 } 530 531 /* namespace.c */ 532 #define NFS_PATH_CANONICAL 1 533 extern char *nfs_path(char **p, struct dentry *dentry, 534 char *buffer, ssize_t buflen, unsigned flags); 535 extern struct vfsmount *nfs_d_automount(struct path *path); 536 int nfs_submount(struct fs_context *, struct nfs_server *); 537 int nfs_do_submount(struct fs_context *); 538 539 /* getroot.c */ 540 extern int nfs_get_root(struct super_block *s, struct fs_context *fc); 541 #if IS_ENABLED(CONFIG_NFS_V4) 542 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool); 543 #endif 544 545 struct nfs_pgio_completion_ops; 546 /* read.c */ 547 extern const struct nfs_pgio_completion_ops nfs_async_read_completion_ops; 548 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, 549 struct inode *inode, bool force_mds, 550 const struct nfs_pgio_completion_ops *compl_ops); 551 extern bool nfs_read_alloc_scratch(struct nfs_pgio_header *hdr, size_t size); 552 extern int nfs_read_add_folio(struct nfs_pageio_descriptor *pgio, 553 struct nfs_open_context *ctx, 554 struct folio *folio); 555 extern void nfs_pageio_complete_read(struct nfs_pageio_descriptor *pgio); 556 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio); 557 558 /* super.c */ 559 void nfs_umount_begin(struct super_block *); 560 int nfs_statfs(struct dentry *, struct kstatfs *); 561 int nfs_show_options(struct seq_file *, struct dentry *); 562 int nfs_show_devname(struct seq_file *, struct dentry *); 563 int nfs_show_path(struct seq_file *, struct dentry *); 564 int nfs_show_stats(struct seq_file *, struct dentry *); 565 int nfs_reconfigure(struct fs_context *); 566 567 /* write.c */ 568 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, 569 struct inode *inode, int ioflags, bool force_mds, 570 const struct nfs_pgio_completion_ops *compl_ops); 571 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio); 572 extern void nfs_commit_free(struct nfs_commit_data *p); 573 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata); 574 extern int nfs_initiate_commit(struct rpc_clnt *clnt, 575 struct nfs_commit_data *data, 576 const struct nfs_rpc_ops *nfs_ops, 577 const struct rpc_call_ops *call_ops, 578 int how, int flags, 579 struct nfsd_file *localio); 580 extern void nfs_init_commit(struct nfs_commit_data *data, 581 struct list_head *head, 582 struct pnfs_layout_segment *lseg, 583 struct nfs_commit_info *cinfo); 584 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst, 585 struct nfs_commit_info *cinfo, int max); 586 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *); 587 int nfs_scan_commit(struct inode *inode, struct list_head *dst, 588 struct nfs_commit_info *cinfo); 589 void nfs_mark_request_commit(struct nfs_page *req, 590 struct pnfs_layout_segment *lseg, 591 struct nfs_commit_info *cinfo, 592 u32 ds_commit_idx); 593 int nfs_write_need_commit(struct nfs_pgio_header *); 594 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr); 595 int nfs_generic_commit_list(struct inode *inode, struct list_head *head, 596 int how, struct nfs_commit_info *cinfo); 597 void nfs_retry_commit(struct list_head *page_list, 598 struct pnfs_layout_segment *lseg, 599 struct nfs_commit_info *cinfo, 600 u32 ds_commit_idx); 601 void nfs_commitdata_release(struct nfs_commit_data *data); 602 void nfs_request_add_commit_list(struct nfs_page *req, 603 struct nfs_commit_info *cinfo); 604 void nfs_request_add_commit_list_locked(struct nfs_page *req, 605 struct list_head *dst, 606 struct nfs_commit_info *cinfo); 607 void nfs_request_remove_commit_list(struct nfs_page *req, 608 struct nfs_commit_info *cinfo); 609 void nfs_init_cinfo(struct nfs_commit_info *cinfo, 610 struct inode *inode, 611 struct nfs_direct_req *dreq); 612 int nfs_key_timeout_notify(struct file *filp, struct inode *inode); 613 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode); 614 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio); 615 616 int nfs_filemap_write_and_wait_range(struct address_space *mapping, 617 loff_t lstart, loff_t lend); 618 619 #ifdef CONFIG_NFS_V4_1 620 static inline void pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket * buckets,unsigned int nbuckets)621 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets, 622 unsigned int nbuckets) 623 { 624 unsigned int i; 625 626 for (i = 0; i < nbuckets; i++) 627 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW; 628 } 629 static inline nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info * cinfo)630 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 631 { 632 struct pnfs_commit_array *array; 633 634 rcu_read_lock(); 635 list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list) 636 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets, 637 array->nbuckets); 638 rcu_read_unlock(); 639 } 640 #else 641 static inline nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info * cinfo)642 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo) 643 { 644 } 645 #endif 646 647 #ifdef CONFIG_MIGRATION 648 int nfs_migrate_folio(struct address_space *, struct folio *dst, 649 struct folio *src, enum migrate_mode); 650 #else 651 #define nfs_migrate_folio NULL 652 #endif 653 654 static inline int nfs_write_verifier_cmp(const struct nfs_write_verifier * v1,const struct nfs_write_verifier * v2)655 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1, 656 const struct nfs_write_verifier *v2) 657 { 658 return memcmp(v1->data, v2->data, sizeof(v1->data)); 659 } 660 661 static inline bool nfs_write_match_verf(const struct nfs_writeverf * verf,struct nfs_page * req)662 nfs_write_match_verf(const struct nfs_writeverf *verf, 663 struct nfs_page *req) 664 { 665 return verf->committed > NFS_UNSTABLE && 666 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier); 667 } 668 nfs_io_gfp_mask(void)669 static inline gfp_t nfs_io_gfp_mask(void) 670 { 671 if (current->flags & PF_WQ_WORKER) 672 return GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN; 673 return GFP_KERNEL; 674 } 675 676 /* 677 * Special version of should_remove_suid() that ignores capabilities. 678 */ nfs_should_remove_suid(const struct inode * inode)679 static inline int nfs_should_remove_suid(const struct inode *inode) 680 { 681 umode_t mode = inode->i_mode; 682 int kill = 0; 683 684 /* suid always must be killed */ 685 if (unlikely(mode & S_ISUID)) 686 kill = ATTR_KILL_SUID; 687 688 /* 689 * sgid without any exec bits is just a mandatory locking mark; leave 690 * it alone. If some exec bits are set, it's a real sgid; kill it. 691 */ 692 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) 693 kill |= ATTR_KILL_SGID; 694 695 if (unlikely(kill && S_ISREG(mode))) 696 return kill; 697 698 return 0; 699 } 700 701 /* unlink.c */ 702 extern struct rpc_task * 703 nfs_async_rename(struct inode *old_dir, struct inode *new_dir, 704 struct dentry *old_dentry, struct dentry *new_dentry, 705 void (*complete)(struct rpc_task *, struct nfs_renamedata *)); 706 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry); 707 708 /* direct.c */ 709 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo, 710 struct nfs_direct_req *dreq); 711 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq, loff_t offset); 712 713 /* nfs4proc.c */ 714 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp, 715 const struct nfs_client_initdata *); 716 extern int nfs40_walk_client_list(struct nfs_client *clp, 717 struct nfs_client **result, 718 const struct cred *cred); 719 extern int nfs41_walk_client_list(struct nfs_client *clp, 720 struct nfs_client **result, 721 const struct cred *cred); 722 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt, 723 struct rpc_xprt *xprt, 724 void *data); 725 nfs_igrab_and_active(struct inode * inode)726 static inline struct inode *nfs_igrab_and_active(struct inode *inode) 727 { 728 struct super_block *sb = inode->i_sb; 729 730 if (sb && nfs_sb_active(sb)) { 731 if (igrab(inode)) 732 return inode; 733 nfs_sb_deactive(sb); 734 } 735 return NULL; 736 } 737 nfs_iput_and_deactive(struct inode * inode)738 static inline void nfs_iput_and_deactive(struct inode *inode) 739 { 740 if (inode != NULL) { 741 struct super_block *sb = inode->i_sb; 742 743 iput(inode); 744 nfs_sb_deactive(sb); 745 } 746 } 747 748 /* 749 * Determine the device name as a string 750 */ nfs_devname(struct dentry * dentry,char * buffer,ssize_t buflen)751 static inline char *nfs_devname(struct dentry *dentry, 752 char *buffer, ssize_t buflen) 753 { 754 char *dummy; 755 return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL); 756 } 757 758 /* 759 * Determine the actual block size (and log2 thereof) 760 */ 761 static inline nfs_block_bits(unsigned long bsize,unsigned char * nrbitsp)762 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp) 763 { 764 /* make sure blocksize is a power of two */ 765 if ((bsize & (bsize - 1)) || nrbitsp) { 766 unsigned char nrbits; 767 768 for (nrbits = 31; nrbits && !(bsize & (1UL << nrbits)); nrbits--) 769 ; 770 bsize = 1UL << nrbits; 771 if (nrbitsp) 772 *nrbitsp = nrbits; 773 } 774 775 return bsize; 776 } 777 778 /* 779 * Calculate the number of 512byte blocks used. 780 */ nfs_calc_block_size(u64 tsize)781 static inline blkcnt_t nfs_calc_block_size(u64 tsize) 782 { 783 blkcnt_t used = (tsize + 511) >> 9; 784 return (used > ULONG_MAX) ? ULONG_MAX : used; 785 } 786 787 /* 788 * Compute and set NFS server blocksize 789 */ 790 static inline nfs_block_size(unsigned long bsize,unsigned char * nrbitsp)791 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp) 792 { 793 if (bsize < NFS_MIN_FILE_IO_SIZE) 794 bsize = NFS_DEF_FILE_IO_SIZE; 795 else if (bsize >= NFS_MAX_FILE_IO_SIZE) 796 bsize = NFS_MAX_FILE_IO_SIZE; 797 798 return nfs_block_bits(bsize, nrbitsp); 799 } 800 801 /* 802 * Compute and set NFS server rsize / wsize 803 */ 804 static inline nfs_io_size(unsigned long iosize,enum xprt_transports proto)805 unsigned long nfs_io_size(unsigned long iosize, enum xprt_transports proto) 806 { 807 if (iosize < NFS_MIN_FILE_IO_SIZE) 808 iosize = NFS_DEF_FILE_IO_SIZE; 809 else if (iosize >= NFS_MAX_FILE_IO_SIZE) 810 iosize = NFS_MAX_FILE_IO_SIZE; 811 812 if (proto == XPRT_TRANSPORT_UDP || iosize < PAGE_SIZE) 813 return nfs_block_bits(iosize, NULL); 814 return iosize & PAGE_MASK; 815 } 816 817 /* 818 * Determine the maximum file size for a superblock 819 */ 820 static inline nfs_super_set_maxbytes(struct super_block * sb,__u64 maxfilesize)821 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize) 822 { 823 sb->s_maxbytes = (loff_t)maxfilesize; 824 if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0) 825 sb->s_maxbytes = MAX_LFS_FILESIZE; 826 } 827 828 /* 829 * Record the page as unstable (an extra writeback period) and mark its 830 * inode as dirty. 831 */ nfs_folio_mark_unstable(struct folio * folio,struct nfs_commit_info * cinfo)832 static inline void nfs_folio_mark_unstable(struct folio *folio, 833 struct nfs_commit_info *cinfo) 834 { 835 if (folio && !cinfo->dreq) { 836 struct inode *inode = folio->mapping->host; 837 long nr = folio_nr_pages(folio); 838 839 /* This page is really still in write-back - just that the 840 * writeback is happening on the server now. 841 */ 842 node_stat_mod_folio(folio, NR_WRITEBACK, nr); 843 wb_stat_mod(&inode_to_bdi(inode)->wb, WB_WRITEBACK, nr); 844 __mark_inode_dirty(inode, I_DIRTY_DATASYNC); 845 } 846 } 847 848 /* 849 * Determine the number of bytes of data the page contains 850 */ nfs_folio_length(struct folio * folio)851 static inline size_t nfs_folio_length(struct folio *folio) 852 { 853 loff_t i_size = i_size_read(folio->mapping->host); 854 855 if (i_size > 0) { 856 pgoff_t index = folio->index >> folio_order(folio); 857 pgoff_t end_index = (i_size - 1) >> folio_shift(folio); 858 if (index < end_index) 859 return folio_size(folio); 860 if (index == end_index) 861 return offset_in_folio(folio, i_size - 1) + 1; 862 } 863 return 0; 864 } 865 866 /* 867 * Convert a umode to a dirent->d_type 868 */ 869 static inline nfs_umode_to_dtype(umode_t mode)870 unsigned char nfs_umode_to_dtype(umode_t mode) 871 { 872 return (mode >> 12) & 15; 873 } 874 875 /* 876 * Determine the number of pages in an array of length 'len' and 877 * with a base offset of 'base' 878 */ nfs_page_array_len(unsigned int base,size_t len)879 static inline unsigned int nfs_page_array_len(unsigned int base, size_t len) 880 { 881 return ((unsigned long)len + (unsigned long)base + PAGE_SIZE - 1) >> 882 PAGE_SHIFT; 883 } 884 885 /* 886 * Convert a struct timespec64 into a 64-bit change attribute 887 * 888 * This does approximately the same thing as timespec64_to_ns(), 889 * but for calculation efficiency, we multiply the seconds by 890 * 1024*1024*1024. 891 */ 892 static inline nfs_timespec_to_change_attr(const struct timespec64 * ts)893 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts) 894 { 895 return ((u64)ts->tv_sec << 30) + ts->tv_nsec; 896 } 897 898 #ifdef CONFIG_CRC32 nfs_stateid_hash(const nfs4_stateid * stateid)899 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid) 900 { 901 return ~crc32_le(0xFFFFFFFF, &stateid->other[0], 902 NFS4_STATEID_OTHER_SIZE); 903 } 904 #else nfs_stateid_hash(nfs4_stateid * stateid)905 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid) 906 { 907 return 0; 908 } 909 #endif 910 nfs_error_is_fatal(int err)911 static inline bool nfs_error_is_fatal(int err) 912 { 913 switch (err) { 914 case -ERESTARTSYS: 915 case -EINTR: 916 case -EACCES: 917 case -EDQUOT: 918 case -EFBIG: 919 case -EIO: 920 case -ENOSPC: 921 case -EROFS: 922 case -ESTALE: 923 case -E2BIG: 924 case -ENOMEM: 925 case -ETIMEDOUT: 926 return true; 927 default: 928 return false; 929 } 930 } 931 nfs_error_is_fatal_on_server(int err)932 static inline bool nfs_error_is_fatal_on_server(int err) 933 { 934 switch (err) { 935 case 0: 936 case -ERESTARTSYS: 937 case -EINTR: 938 case -ENOMEM: 939 return false; 940 } 941 return nfs_error_is_fatal(err); 942 } 943 944 /* 945 * Select between a default port value and a user-specified port value. 946 * If a zero value is set, then autobind will be used. 947 */ nfs_set_port(struct sockaddr_storage * sap,int * port,const unsigned short default_port)948 static inline void nfs_set_port(struct sockaddr_storage *sap, int *port, 949 const unsigned short default_port) 950 { 951 if (*port == NFS_UNSPEC_PORT) 952 *port = default_port; 953 954 rpc_set_port((struct sockaddr *)sap, *port); 955 } 956 957 struct nfs_direct_req { 958 struct kref kref; /* release manager */ 959 960 /* I/O parameters */ 961 struct nfs_open_context *ctx; /* file open context info */ 962 struct nfs_lock_context *l_ctx; /* Lock context info */ 963 struct kiocb * iocb; /* controlling i/o request */ 964 struct inode * inode; /* target file of i/o */ 965 966 /* completion state */ 967 atomic_t io_count; /* i/os we're waiting for */ 968 spinlock_t lock; /* protect completion state */ 969 970 loff_t io_start; /* Start offset for I/O */ 971 ssize_t count, /* bytes actually processed */ 972 max_count, /* max expected count */ 973 error; /* any reported error */ 974 struct completion completion; /* wait for i/o completion */ 975 976 /* commit state */ 977 struct nfs_mds_commit_info mds_cinfo; /* Storage for cinfo */ 978 struct pnfs_ds_commit_info ds_cinfo; /* Storage for cinfo */ 979 struct work_struct work; 980 int flags; 981 /* for write */ 982 #define NFS_ODIRECT_DO_COMMIT (1) /* an unstable reply was received */ 983 #define NFS_ODIRECT_RESCHED_WRITES (2) /* write verification failed */ 984 /* for read */ 985 #define NFS_ODIRECT_SHOULD_DIRTY (3) /* dirty user-space page after read */ 986 #define NFS_ODIRECT_DONE INT_MAX /* write verification failed */ 987 }; 988