fs/nfs/internal.h

   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 /*
  46  * Note: RFC 1813 doesn't limit the number of auth flavors that
  47  * a server can return, so make something up.
  48  */
  49 #define NFS_MAX_SECFLAVORS      (12)
  50
  51 /*
  52  * Value used if the user did not specify a port value.
  53  */
  54 #define NFS_UNSPEC_PORT         (-1)
  55
  56 #define NFS_UNSPEC_RETRANS      (UINT_MAX)
  57 #define NFS_UNSPEC_TIMEO        (UINT_MAX)
  58
  59 struct nfs_client_initdata {
  60         unsigned long init_flags;
  61         const char *hostname;                   /* Hostname of the server */
  62         const struct sockaddr *addr;            /* Address of the server */
  63         const char *nodename;                   /* Hostname of the client */
  64         const char *ip_addr;                    /* IP address of the client */
  65         size_t addrlen;
  66         struct nfs_subversion *nfs_mod;
  67         int proto;
  68         u32 minorversion;
  69         unsigned int nconnect;
  70         struct net *net;
  71         const struct rpc_timeout *timeparms;
  72         const struct cred *cred;
  73 };
  74
  75 /*
  76  * In-kernel mount arguments
  77  */
  78 struct nfs_fs_context {
  79         bool                    internal;
  80         bool                    skip_reconfig_option_check;
  81         bool                    need_mount;
  82         bool                    sloppy;
  83         unsigned int            flags;          /* NFS{,4}_MOUNT_* flags */
  84         unsigned int            rsize, wsize;
  85         unsigned int            timeo, retrans;
  86         unsigned int            acregmin, acregmax;
  87         unsigned int            acdirmin, acdirmax;
  88         unsigned int            namlen;
  89         unsigned int            options;
  90         unsigned int            bsize;
  91         struct nfs_auth_info    auth_info;
  92         rpc_authflavor_t        selected_flavor;
  93         char                    *client_address;
  94         unsigned int            version;
  95         unsigned int            minorversion;
  96         char                    *fscache_uniq;
  97         unsigned short          protofamily;
  98         unsigned short          mountfamily;
  99
 100         struct {
 101                 union {
 102                         struct sockaddr address;
 103                         struct sockaddr_storage _address;
 104                 };
 105                 size_t                  addrlen;
 106                 char                    *hostname;
 107                 u32                     version;
 108                 int                     port;
 109                 unsigned short          protocol;
 110         } mount_server;
 111
 112         struct {
 113                 union {
 114                         struct sockaddr address;
 115                         struct sockaddr_storage _address;
 116                 };
 117                 size_t                  addrlen;
 118                 char                    *hostname;
 119                 char                    *export_path;
 120                 int                     port;
 121                 unsigned short          protocol;
 122                 unsigned short          nconnect;
 123                 unsigned short          export_path_len;
 124         } nfs_server;
 125
 126         struct nfs_fh           *mntfh;
 127         struct nfs_server       *server;
 128         struct nfs_subversion   *nfs_mod;
 129
 130         /* Information for a cloned mount. */
 131         struct nfs_clone_mount {
 132                 struct super_block      *sb;
 133                 struct dentry           *dentry;
 134                 struct nfs_fattr        *fattr;
 135                 unsigned int            inherited_bsize;
 136         } clone_data;
 137 };
 138
 139 #define nfs_errorf(fc, fmt, ...) errorf(fc, fmt, ## __VA_ARGS__)
 140 #define nfs_invalf(fc, fmt, ...) invalf(fc, fmt, ## __VA_ARGS__)
 141 #define nfs_warnf(fc, fmt, ...) warnf(fc, fmt, ## __VA_ARGS__)
 142
 143 static inline struct nfs_fs_context *nfs_fc2context(const struct fs_context *fc)
 144 {
 145         return fc->fs_private;
 146 }
 147
 148 /* mount_clnt.c */
 149 struct nfs_mount_request {
 150         struct sockaddr         *sap;
 151         size_t                  salen;
 152         char                    *hostname;
 153         char                    *dirpath;
 154         u32                     version;
 155         unsigned short          protocol;
 156         struct nfs_fh           *fh;
 157         int                     noresvport;
 158         unsigned int            *auth_flav_len;
 159         rpc_authflavor_t        *auth_flavs;
 160         struct net              *net;
 161 };
 162
 163 extern int nfs_mount(struct nfs_mount_request *info);
 164 extern void nfs_umount(const struct nfs_mount_request *info);
 165
 166 /* client.c */
 167 extern const struct rpc_program nfs_program;
 168 extern void nfs_clients_init(struct net *net);
 169 extern void nfs_clients_exit(struct net *net);
 170 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
 171 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
 172 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *);
 173 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
 174 void nfs_server_insert_lists(struct nfs_server *);
 175 void nfs_server_remove_lists(struct nfs_server *);
 176 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
 177 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
 178                 rpc_authflavor_t);
 179 struct nfs_server *nfs_alloc_server(void);
 180 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
 181
 182 extern void nfs_put_client(struct nfs_client *);
 183 extern void nfs_free_client(struct nfs_client *);
 184 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
 185 extern struct nfs_client *
 186 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
 187                                 struct nfs4_sessionid *, u32);
 188 extern struct nfs_server *nfs_create_server(struct fs_context *);
 189 extern struct nfs_server *nfs4_create_server(struct fs_context *);
 190 extern struct nfs_server *nfs4_create_referral_server(struct fs_context *);
 191 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
 192                                         struct sockaddr *sap, size_t salen,
 193                                         struct net *net);
 194 extern void nfs_free_server(struct nfs_server *server);
 195 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 196                                            struct nfs_fh *,
 197                                            struct nfs_fattr *,
 198                                            rpc_authflavor_t);
 199 extern bool nfs_client_init_is_complete(const struct nfs_client *clp);
 200 extern int nfs_client_init_status(const struct nfs_client *clp);
 201 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
 202 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 203 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 204                                              const struct sockaddr *ds_addr,
 205                                              int ds_addrlen, int ds_proto,
 206                                              unsigned int ds_timeo,
 207                                              unsigned int ds_retrans,
 208                                              u32 minor_version);
 209 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
 210                                                 struct inode *);
 211 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
 212                         const struct sockaddr *ds_addr, int ds_addrlen,
 213                         int ds_proto, unsigned int ds_timeo,
 214                         unsigned int ds_retrans);
 215 #ifdef CONFIG_PROC_FS
 216 extern int __init nfs_fs_proc_init(void);
 217 extern void nfs_fs_proc_exit(void);
 218 extern int nfs_fs_proc_net_init(struct net *net);
 219 extern void nfs_fs_proc_net_exit(struct net *net);
 220 #else
 221 static inline int nfs_fs_proc_net_init(struct net *net)
 222 {
 223         return 0;
 224 }
 225 static inline void nfs_fs_proc_net_exit(struct net *net)
 226 {
 227 }
 228 static inline int nfs_fs_proc_init(void)
 229 {
 230         return 0;
 231 }
 232 static inline void nfs_fs_proc_exit(void)
 233 {
 234 }
 235 #endif
 236
 237 /* callback_xdr.c */
 238 extern const struct svc_version nfs4_callback_version1;
 239 extern const struct svc_version nfs4_callback_version4;
 240
 241 /* fs_context.c */
 242 extern struct file_system_type nfs_fs_type;
 243
 244 /* pagelist.c */
 245 extern int __init nfs_init_nfspagecache(void);
 246 extern void nfs_destroy_nfspagecache(void);
 247 extern int __init nfs_init_readpagecache(void);
 248 extern void nfs_destroy_readpagecache(void);
 249 extern int __init nfs_init_writepagecache(void);
 250 extern void nfs_destroy_writepagecache(void);
 251
 252 extern int __init nfs_init_directcache(void);
 253 extern void nfs_destroy_directcache(void);
 254 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 255                               struct nfs_pgio_header *hdr,
 256                               void (*release)(struct nfs_pgio_header *hdr));
 257 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 258 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
 259
 260 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
 261 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
 262 void nfs_pgio_header_free(struct nfs_pgio_header *);
 263 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
 264 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
 265                       const struct cred *cred, const struct nfs_rpc_ops *rpc_ops,
 266                       const struct rpc_call_ops *call_ops, int how, int flags);
 267 void nfs_free_request(struct nfs_page *req);
 268 struct nfs_pgio_mirror *
 269 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
 270
 271 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
 272                 const struct nfs_open_context *ctx2)
 273 {
 274         return cred_fscmp(ctx1->cred, ctx2->cred) == 0 && ctx1->state == ctx2->state;
 275 }
 276
 277 /* nfs2xdr.c */
 278 extern const struct rpc_procinfo nfs_procedures[];
 279 extern int nfs2_decode_dirent(struct xdr_stream *,
 280                                 struct nfs_entry *, bool);
 281
 282 /* nfs3xdr.c */
 283 extern const struct rpc_procinfo nfs3_procedures[];
 284 extern int nfs3_decode_dirent(struct xdr_stream *,
 285                                 struct nfs_entry *, bool);
 286
 287 /* nfs4xdr.c */
 288 #if IS_ENABLED(CONFIG_NFS_V4)
 289 extern int nfs4_decode_dirent(struct xdr_stream *,
 290                                 struct nfs_entry *, bool);
 291 #endif
 292 #ifdef CONFIG_NFS_V4_1
 293 extern const u32 nfs41_maxread_overhead;
 294 extern const u32 nfs41_maxwrite_overhead;
 295 extern const u32 nfs41_maxgetdevinfo_overhead;
 296 #endif
 297
 298 /* nfs4proc.c */
 299 #if IS_ENABLED(CONFIG_NFS_V4)
 300 extern const struct rpc_procinfo nfs4_procedures[];
 301 #endif
 302
 303 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 304 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
 305 static inline struct nfs4_label *
 306 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 307 {
 308         if (!dst || !src)
 309                 return NULL;
 310
 311         if (src->len > NFS4_MAXLABELLEN)
 312                 return NULL;
 313
 314         dst->lfs = src->lfs;
 315         dst->pi = src->pi;
 316         dst->len = src->len;
 317         memcpy(dst->label, src->label, src->len);
 318
 319         return dst;
 320 }
 321 static inline void nfs4_label_free(struct nfs4_label *label)
 322 {
 323         if (label) {
 324                 kfree(label->label);
 325                 kfree(label);
 326         }
 327         return;
 328 }
 329
 330 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 331 {
 332         if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
 333                 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
 334 }
 335 #else
 336 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
 337 static inline void nfs4_label_free(void *label) {}
 338 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 339 {
 340 }
 341 static inline struct nfs4_label *
 342 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 343 {
 344         return NULL;
 345 }
 346 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
 347
 348 /* proc.c */
 349 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 350 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
 351                            const struct nfs_client_initdata *);
 352
 353 /* dir.c */
 354 extern void nfs_advise_use_readdirplus(struct inode *dir);
 355 extern void nfs_force_use_readdirplus(struct inode *dir);
 356 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
 357                                             struct shrink_control *sc);
 358 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
 359                                            struct shrink_control *sc);
 360 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
 361 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
 362 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
 363 int nfs_rmdir(struct inode *, struct dentry *);
 364 int nfs_unlink(struct inode *, struct dentry *);
 365 int nfs_symlink(struct inode *, struct dentry *, const char *);
 366 int nfs_link(struct dentry *, struct inode *, struct dentry *);
 367 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
 368 int nfs_rename(struct inode *, struct dentry *,
 369                struct inode *, struct dentry *, unsigned int);
 370
 371 /* file.c */
 372 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
 373 loff_t nfs_file_llseek(struct file *, loff_t, int);
 374 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
 375 int nfs_file_mmap(struct file *, struct vm_area_struct *);
 376 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
 377 int nfs_file_release(struct inode *, struct file *);
 378 int nfs_lock(struct file *, int, struct file_lock *);
 379 int nfs_flock(struct file *, int, struct file_lock *);
 380 int nfs_check_flags(int);
 381
 382 /* inode.c */
 383 extern struct workqueue_struct *nfsiod_workqueue;
 384 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 385 extern void nfs_free_inode(struct inode *);
 386 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 387 extern int nfs_drop_inode(struct inode *);
 388 extern void nfs_clear_inode(struct inode *);
 389 extern void nfs_evict_inode(struct inode *);
 390 void nfs_zap_acl_cache(struct inode *inode);
 391 extern bool nfs_check_cache_invalid(struct inode *, unsigned long);
 392 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
 393 extern int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode);
 394
 395 /* super.c */
 396 extern const struct super_operations nfs_sops;
 397 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
 398 int nfs_try_get_tree(struct fs_context *);
 399 int nfs_get_tree_common(struct fs_context *);
 400 void nfs_kill_super(struct super_block *);
 401
 402 extern struct rpc_stat nfs_rpcstat;
 403
 404 extern int __init register_nfs_fs(void);
 405 extern void __exit unregister_nfs_fs(void);
 406 extern bool nfs_sb_active(struct super_block *sb);
 407 extern void nfs_sb_deactive(struct super_block *sb);
 408 extern int nfs_client_for_each_server(struct nfs_client *clp,
 409                                       int (*fn)(struct nfs_server *, void *),
 410                                       void *data);
 411 /* io.c */
 412 extern void nfs_start_io_read(struct inode *inode);
 413 extern void nfs_end_io_read(struct inode *inode);
 414 extern void nfs_start_io_write(struct inode *inode);
 415 extern void nfs_end_io_write(struct inode *inode);
 416 extern void nfs_start_io_direct(struct inode *inode);
 417 extern void nfs_end_io_direct(struct inode *inode);
 418
 419 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
 420 {
 421         return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
 422 }
 423
 424 /* namespace.c */
 425 #define NFS_PATH_CANONICAL 1
 426 extern char *nfs_path(char **p, struct dentry *dentry,
 427                       char *buffer, ssize_t buflen, unsigned flags);
 428 extern struct vfsmount *nfs_d_automount(struct path *path);
 429 int nfs_submount(struct fs_context *, struct nfs_server *);
 430 int nfs_do_submount(struct fs_context *);
 431
 432 /* getroot.c */
 433 extern int nfs_get_root(struct super_block *s, struct fs_context *fc);
 434 #if IS_ENABLED(CONFIG_NFS_V4)
 435 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
 436 #endif
 437
 438 struct nfs_pgio_completion_ops;
 439 /* read.c */
 440 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 441                         struct inode *inode, bool force_mds,
 442                         const struct nfs_pgio_completion_ops *compl_ops);
 443 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 444 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 445
 446 /* super.c */
 447 void nfs_umount_begin(struct super_block *);
 448 int  nfs_statfs(struct dentry *, struct kstatfs *);
 449 int  nfs_show_options(struct seq_file *, struct dentry *);
 450 int  nfs_show_devname(struct seq_file *, struct dentry *);
 451 int  nfs_show_path(struct seq_file *, struct dentry *);
 452 int  nfs_show_stats(struct seq_file *, struct dentry *);
 453 int  nfs_reconfigure(struct fs_context *);
 454
 455 /* write.c */
 456 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 457                         struct inode *inode, int ioflags, bool force_mds,
 458                         const struct nfs_pgio_completion_ops *compl_ops);
 459 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
 460 extern void nfs_commit_free(struct nfs_commit_data *p);
 461 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 462 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
 463 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
 464                                struct nfs_commit_data *data,
 465                                const struct nfs_rpc_ops *nfs_ops,
 466                                const struct rpc_call_ops *call_ops,
 467                                int how, int flags);
 468 extern void nfs_init_commit(struct nfs_commit_data *data,
 469                             struct list_head *head,
 470                             struct pnfs_layout_segment *lseg,
 471                             struct nfs_commit_info *cinfo);
 472 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
 473                          struct nfs_commit_info *cinfo, int max);
 474 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
 475 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
 476                     struct nfs_commit_info *cinfo);
 477 void nfs_mark_request_commit(struct nfs_page *req,
 478                              struct pnfs_layout_segment *lseg,
 479                              struct nfs_commit_info *cinfo,
 480                              u32 ds_commit_idx);
 481 int nfs_write_need_commit(struct nfs_pgio_header *);
 482 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
 483 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
 484                             int how, struct nfs_commit_info *cinfo);
 485 void nfs_retry_commit(struct list_head *page_list,
 486                       struct pnfs_layout_segment *lseg,
 487                       struct nfs_commit_info *cinfo,
 488                       u32 ds_commit_idx);
 489 void nfs_commitdata_release(struct nfs_commit_data *data);
 490 void nfs_request_add_commit_list(struct nfs_page *req,
 491                                  struct nfs_commit_info *cinfo);
 492 void nfs_request_add_commit_list_locked(struct nfs_page *req,
 493                 struct list_head *dst,
 494                 struct nfs_commit_info *cinfo);
 495 void nfs_request_remove_commit_list(struct nfs_page *req,
 496                                     struct nfs_commit_info *cinfo);
 497 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
 498                     struct inode *inode,
 499                     struct nfs_direct_req *dreq);
 500 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
 501 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
 502 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
 503
 504 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
 505                 loff_t lstart, loff_t lend);
 506
 507 #ifdef CONFIG_NFS_V4_1
 508 static inline void
 509 pnfs_bucket_clear_pnfs_ds_commit_verifiers(struct pnfs_commit_bucket *buckets,
 510                 unsigned int nbuckets)
 511 {
 512         unsigned int i;
 513
 514         for (i = 0; i < nbuckets; i++)
 515                 buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
 516 }
 517 static inline
 518 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
 519 {
 520         struct pnfs_commit_array *array;
 521
 522         rcu_read_lock();
 523         list_for_each_entry_rcu(array, &cinfo->commits, cinfo_list)
 524                 pnfs_bucket_clear_pnfs_ds_commit_verifiers(array->buckets,
 525                                 array->nbuckets);
 526         rcu_read_unlock();
 527 }
 528 #else
 529 static inline
 530 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
 531 {
 532 }
 533 #endif
 534
 535 #ifdef CONFIG_MIGRATION
 536 extern int nfs_migrate_page(struct address_space *,
 537                 struct page *, struct page *, enum migrate_mode);
 538 #endif
 539
 540 static inline int
 541 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
 542                 const struct nfs_write_verifier *v2)
 543 {
 544         return memcmp(v1->data, v2->data, sizeof(v1->data));
 545 }
 546
 547 static inline bool
 548 nfs_write_match_verf(const struct nfs_writeverf *verf,
 549                 struct nfs_page *req)
 550 {
 551         return verf->committed > NFS_UNSTABLE &&
 552                 !nfs_write_verifier_cmp(&req->wb_verf, &verf->verifier);
 553 }
 554
 555 /* unlink.c */
 556 extern struct rpc_task *
 557 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
 558                  struct dentry *old_dentry, struct dentry *new_dentry,
 559                  void (*complete)(struct rpc_task *, struct nfs_renamedata *));
 560 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 561
 562 /* direct.c */
 563 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
 564                               struct nfs_direct_req *dreq);
 565 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
 566
 567 /* nfs4proc.c */
 568 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 569                             const struct nfs_client_initdata *);
 570 extern int nfs40_walk_client_list(struct nfs_client *clp,
 571                                 struct nfs_client **result,
 572                                 const struct cred *cred);
 573 extern int nfs41_walk_client_list(struct nfs_client *clp,
 574                                 struct nfs_client **result,
 575                                 const struct cred *cred);
 576 extern void nfs4_test_session_trunk(struct rpc_clnt *clnt,
 577                                 struct rpc_xprt *xprt,
 578                                 void *data);
 579
 580 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
 581 {
 582         inode = igrab(inode);
 583         if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
 584                 iput(inode);
 585                 inode = NULL;
 586         }
 587         return inode;
 588 }
 589
 590 static inline void nfs_iput_and_deactive(struct inode *inode)
 591 {
 592         if (inode != NULL) {
 593                 struct super_block *sb = inode->i_sb;
 594
 595                 iput(inode);
 596                 nfs_sb_deactive(sb);
 597         }
 598 }
 599
 600 /*
 601  * Determine the device name as a string
 602  */
 603 static inline char *nfs_devname(struct dentry *dentry,
 604                                 char *buffer, ssize_t buflen)
 605 {
 606         char *dummy;
 607         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
 608 }
 609
 610 /*
 611  * Determine the actual block size (and log2 thereof)
 612  */
 613 static inline
 614 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 615 {
 616         /* make sure blocksize is a power of two */
 617         if ((bsize & (bsize - 1)) || nrbitsp) {
 618                 unsigned char   nrbits;
 619
 620                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 621                         ;
 622                 bsize = 1 << nrbits;
 623                 if (nrbitsp)
 624                         *nrbitsp = nrbits;
 625         }
 626
 627         return bsize;
 628 }
 629
 630 /*
 631  * Calculate the number of 512byte blocks used.
 632  */
 633 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 634 {
 635         blkcnt_t used = (tsize + 511) >> 9;
 636         return (used > ULONG_MAX) ? ULONG_MAX : used;
 637 }
 638
 639 /*
 640  * Compute and set NFS server blocksize
 641  */
 642 static inline
 643 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 644 {
 645         if (bsize < NFS_MIN_FILE_IO_SIZE)
 646                 bsize = NFS_DEF_FILE_IO_SIZE;
 647         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 648                 bsize = NFS_MAX_FILE_IO_SIZE;
 649
 650         return nfs_block_bits(bsize, nrbitsp);
 651 }
 652
 653 /*
 654  * Determine the maximum file size for a superblock
 655  */
 656 static inline
 657 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 658 {
 659         sb->s_maxbytes = (loff_t)maxfilesize;
 660         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 661                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 662 }
 663
 664 /*
 665  * Record the page as unstable (an extra writeback period) and mark its
 666  * inode as dirty.
 667  */
 668 static inline
 669 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
 670 {
 671         if (!cinfo->dreq) {
 672                 struct inode *inode = page_file_mapping(page)->host;
 673
 674                 /* This page is really still in write-back - just that the
 675                  * writeback is happening on the server now.
 676                  */
 677                 inc_node_page_state(page, NR_WRITEBACK);
 678                 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_WRITEBACK);
 679                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
 680         }
 681 }
 682
 683 /*
 684  * Determine the number of bytes of data the page contains
 685  */
 686 static inline
 687 unsigned int nfs_page_length(struct page *page)
 688 {
 689         loff_t i_size = i_size_read(page_file_mapping(page)->host);
 690
 691         if (i_size > 0) {
 692                 pgoff_t index = page_index(page);
 693                 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
 694                 if (index < end_index)
 695                         return PAGE_SIZE;
 696                 if (index == end_index)
 697                         return ((i_size - 1) & ~PAGE_MASK) + 1;
 698         }
 699         return 0;
 700 }
 701
 702 /*
 703  * Convert a umode to a dirent->d_type
 704  */
 705 static inline
 706 unsigned char nfs_umode_to_dtype(umode_t mode)
 707 {
 708         return (mode >> 12) & 15;
 709 }
 710
 711 /*
 712  * Determine the number of pages in an array of length 'len' and
 713  * with a base offset of 'base'
 714  */
 715 static inline
 716 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 717 {
 718         return ((unsigned long)len + (unsigned long)base +
 719                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 720 }
 721
 722 /*
 723  * Convert a struct timespec64 into a 64-bit change attribute
 724  *
 725  * This does approximately the same thing as timespec64_to_ns(),
 726  * but for calculation efficiency, we multiply the seconds by
 727  * 1024*1024*1024.
 728  */
 729 static inline
 730 u64 nfs_timespec_to_change_attr(const struct timespec64 *ts)
 731 {
 732         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
 733 }
 734
 735 #ifdef CONFIG_CRC32
 736 /**
 737  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
 738  * @fh - pointer to filehandle
 739  *
 740  * returns a crc32 hash for the filehandle that is compatible with
 741  * the one displayed by "wireshark".
 742  */
 743 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 744 {
 745         return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
 746 }
 747 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
 748 {
 749         return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
 750                                 NFS4_STATEID_OTHER_SIZE);
 751 }
 752 #else
 753 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 754 {
 755         return 0;
 756 }
 757 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
 758 {
 759         return 0;
 760 }
 761 #endif
 762
 763 static inline bool nfs_error_is_fatal(int err)
 764 {
 765         switch (err) {
 766         case -ERESTARTSYS:
 767         case -EINTR:
 768         case -EACCES:
 769         case -EDQUOT:
 770         case -EFBIG:
 771         case -EIO:
 772         case -ENOSPC:
 773         case -EROFS:
 774         case -ESTALE:
 775         case -E2BIG:
 776         case -ENOMEM:
 777         case -ETIMEDOUT:
 778                 return true;
 779         default:
 780                 return false;
 781         }
 782 }
 783
 784 static inline bool nfs_error_is_fatal_on_server(int err)
 785 {
 786         switch (err) {
 787         case 0:
 788         case -ERESTARTSYS:
 789         case -EINTR:
 790                 return false;
 791         }
 792         return nfs_error_is_fatal(err);
 793 }
 794
 795 /*
 796  * Select between a default port value and a user-specified port value.
 797  * If a zero value is set, then autobind will be used.
 798  */
 799 static inline void nfs_set_port(struct sockaddr *sap, int *port,
 800                                 const unsigned short default_port)
 801 {
 802         if (*port == NFS_UNSPEC_PORT)
 803                 *port = default_port;
 804
 805         rpc_set_port(sap, *port);
 806 }