fs/nfs/internal.h

   1 /*
   2  * NFS internal definitions
   3  */
   4
   5 #include "nfs4_fs.h"
   6 #include <linux/mount.h>
   7 #include <linux/security.h>
   8 #include <linux/crc32.h>
   9 #include <linux/nfs_page.h>
  10
  11 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
  12
  13 struct nfs_string;
  14
  15 /* Maximum number of readahead requests
  16  * FIXME: this should really be a sysctl so that users may tune it to suit
  17  *        their needs. People that do NFS over a slow network, might for
  18  *        instance want to reduce it to something closer to 1 for improved
  19  *        interactive response.
  20  */
  21 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
  22
  23 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
  24 {
  25         if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
  26                 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
  27 }
  28
  29 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
  30 {
  31         if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
  32             (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
  33              ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
  34                 return 0;
  35         return 1;
  36 }
  37
  38 struct nfs_clone_mount {
  39         const struct super_block *sb;
  40         const struct dentry *dentry;
  41         struct nfs_fh *fh;
  42         struct nfs_fattr *fattr;
  43         char *hostname;
  44         char *mnt_path;
  45         struct sockaddr *addr;
  46         size_t addrlen;
  47         rpc_authflavor_t authflavor;
  48 };
  49
  50 /*
  51  * Note: RFC 1813 doesn't limit the number of auth flavors that
  52  * a server can return, so make something up.
  53  */
  54 #define NFS_MAX_SECFLAVORS      (12)
  55
  56 /*
  57  * Value used if the user did not specify a port value.
  58  */
  59 #define NFS_UNSPEC_PORT         (-1)
  60
  61 /*
  62  * Maximum number of pages that readdir can use for creating
  63  * a vmapped array of pages.
  64  */
  65 #define NFS_MAX_READDIR_PAGES 8
  66
  67 struct nfs_client_initdata {
  68         unsigned long init_flags;
  69         const char *hostname;
  70         const struct sockaddr *addr;
  71         size_t addrlen;
  72         struct nfs_subversion *nfs_mod;
  73         int proto;
  74         u32 minorversion;
  75         struct net *net;
  76 };
  77
  78 /*
  79  * In-kernel mount arguments
  80  */
  81 struct nfs_parsed_mount_data {
  82         int                     flags;
  83         unsigned int            rsize, wsize;
  84         unsigned int            timeo, retrans;
  85         unsigned int            acregmin, acregmax,
  86                                 acdirmin, acdirmax;
  87         unsigned int            namlen;
  88         unsigned int            options;
  89         unsigned int            bsize;
  90         struct nfs_auth_info    auth_info;
  91         rpc_authflavor_t        selected_flavor;
  92         char                    *client_address;
  93         unsigned int            version;
  94         unsigned int            minorversion;
  95         char                    *fscache_uniq;
  96         bool                    need_mount;
  97
  98         struct {
  99                 struct sockaddr_storage address;
 100                 size_t                  addrlen;
 101                 char                    *hostname;
 102                 u32                     version;
 103                 int                     port;
 104                 unsigned short          protocol;
 105         } mount_server;
 106
 107         struct {
 108                 struct sockaddr_storage address;
 109                 size_t                  addrlen;
 110                 char                    *hostname;
 111                 char                    *export_path;
 112                 int                     port;
 113                 unsigned short          protocol;
 114         } nfs_server;
 115
 116         struct security_mnt_opts lsm_opts;
 117         struct net              *net;
 118 };
 119
 120 /* mount_clnt.c */
 121 struct nfs_mount_request {
 122         struct sockaddr         *sap;
 123         size_t                  salen;
 124         char                    *hostname;
 125         char                    *dirpath;
 126         u32                     version;
 127         unsigned short          protocol;
 128         struct nfs_fh           *fh;
 129         int                     noresvport;
 130         unsigned int            *auth_flav_len;
 131         rpc_authflavor_t        *auth_flavs;
 132         struct net              *net;
 133 };
 134
 135 struct nfs_mount_info {
 136         void (*fill_super)(struct super_block *, struct nfs_mount_info *);
 137         int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
 138         struct nfs_parsed_mount_data *parsed;
 139         struct nfs_clone_mount *cloned;
 140         struct nfs_fh *mntfh;
 141 };
 142
 143 extern int nfs_mount(struct nfs_mount_request *info);
 144 extern void nfs_umount(const struct nfs_mount_request *info);
 145
 146 /* client.c */
 147 extern const struct rpc_program nfs_program;
 148 extern void nfs_clients_init(struct net *net);
 149 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
 150 int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
 151 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
 152                                   const struct rpc_timeout *, const char *,
 153                                   rpc_authflavor_t);
 154 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
 155 void nfs_server_insert_lists(struct nfs_server *);
 156 void nfs_server_remove_lists(struct nfs_server *);
 157 void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
 158 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
 159                 rpc_authflavor_t);
 160 struct nfs_server *nfs_alloc_server(void);
 161 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
 162
 163 extern void nfs_cleanup_cb_ident_idr(struct net *);
 164 extern void nfs_put_client(struct nfs_client *);
 165 extern void nfs_free_client(struct nfs_client *);
 166 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
 167 extern struct nfs_client *
 168 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
 169                                 struct nfs4_sessionid *, u32);
 170 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
 171                                         struct nfs_subversion *);
 172 extern struct nfs_server *nfs4_create_server(
 173                                         struct nfs_mount_info *,
 174                                         struct nfs_subversion *);
 175 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 176                                                       struct nfs_fh *);
 177 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
 178                                         struct sockaddr *sap, size_t salen,
 179                                         struct net *net);
 180 extern void nfs_free_server(struct nfs_server *server);
 181 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 182                                            struct nfs_fh *,
 183                                            struct nfs_fattr *,
 184                                            rpc_authflavor_t);
 185 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
 186 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 187 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 188                                              const struct sockaddr *ds_addr,
 189                                              int ds_addrlen, int ds_proto,
 190                                              unsigned int ds_timeo,
 191                                              unsigned int ds_retrans,
 192                                              u32 minor_version,
 193                                              rpc_authflavor_t au_flavor);
 194 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
 195                                                 struct inode *);
 196 extern struct nfs_client *nfs3_set_ds_client(struct nfs_client *mds_clp,
 197                         const struct sockaddr *ds_addr, int ds_addrlen,
 198                         int ds_proto, unsigned int ds_timeo,
 199                         unsigned int ds_retrans, rpc_authflavor_t au_flavor);
 200 #ifdef CONFIG_PROC_FS
 201 extern int __init nfs_fs_proc_init(void);
 202 extern void nfs_fs_proc_exit(void);
 203 extern int nfs_fs_proc_net_init(struct net *net);
 204 extern void nfs_fs_proc_net_exit(struct net *net);
 205 #else
 206 static inline int nfs_fs_proc_net_init(struct net *net)
 207 {
 208         return 0;
 209 }
 210 static inline void nfs_fs_proc_net_exit(struct net *net)
 211 {
 212 }
 213 static inline int nfs_fs_proc_init(void)
 214 {
 215         return 0;
 216 }
 217 static inline void nfs_fs_proc_exit(void)
 218 {
 219 }
 220 #endif
 221
 222 /* callback_xdr.c */
 223 extern struct svc_version nfs4_callback_version1;
 224 extern struct svc_version nfs4_callback_version4;
 225
 226 struct nfs_pageio_descriptor;
 227 /* pagelist.c */
 228 extern int __init nfs_init_nfspagecache(void);
 229 extern void nfs_destroy_nfspagecache(void);
 230 extern int __init nfs_init_readpagecache(void);
 231 extern void nfs_destroy_readpagecache(void);
 232 extern int __init nfs_init_writepagecache(void);
 233 extern void nfs_destroy_writepagecache(void);
 234
 235 extern int __init nfs_init_directcache(void);
 236 extern void nfs_destroy_directcache(void);
 237 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 238                               struct nfs_pgio_header *hdr,
 239                               void (*release)(struct nfs_pgio_header *hdr));
 240 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 241 int nfs_iocounter_wait(struct nfs_io_counter *c);
 242
 243 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
 244 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
 245 void nfs_pgio_header_free(struct nfs_pgio_header *);
 246 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
 247 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
 248                       struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
 249                       const struct rpc_call_ops *call_ops, int how, int flags);
 250 void nfs_free_request(struct nfs_page *req);
 251 struct nfs_pgio_mirror *
 252 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
 253
 254 static inline void nfs_iocounter_init(struct nfs_io_counter *c)
 255 {
 256         c->flags = 0;
 257         atomic_set(&c->io_count, 0);
 258 }
 259
 260 static inline bool nfs_pgio_has_mirroring(struct nfs_pageio_descriptor *desc)
 261 {
 262         WARN_ON_ONCE(desc->pg_mirror_count < 1);
 263         return desc->pg_mirror_count > 1;
 264 }
 265
 266 /* nfs2xdr.c */
 267 extern struct rpc_procinfo nfs_procedures[];
 268 extern int nfs2_decode_dirent(struct xdr_stream *,
 269                                 struct nfs_entry *, int);
 270
 271 /* nfs3xdr.c */
 272 extern struct rpc_procinfo nfs3_procedures[];
 273 extern int nfs3_decode_dirent(struct xdr_stream *,
 274                                 struct nfs_entry *, int);
 275
 276 /* nfs4xdr.c */
 277 #if IS_ENABLED(CONFIG_NFS_V4)
 278 extern int nfs4_decode_dirent(struct xdr_stream *,
 279                                 struct nfs_entry *, int);
 280 #endif
 281 #ifdef CONFIG_NFS_V4_1
 282 extern const u32 nfs41_maxread_overhead;
 283 extern const u32 nfs41_maxwrite_overhead;
 284 extern const u32 nfs41_maxgetdevinfo_overhead;
 285 #endif
 286
 287 /* nfs4proc.c */
 288 #if IS_ENABLED(CONFIG_NFS_V4)
 289 extern struct rpc_procinfo nfs4_procedures[];
 290 #endif
 291
 292 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 293 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
 294 static inline struct nfs4_label *
 295 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 296 {
 297         if (!dst || !src)
 298                 return NULL;
 299
 300         if (src->len > NFS4_MAXLABELLEN)
 301                 return NULL;
 302
 303         dst->lfs = src->lfs;
 304         dst->pi = src->pi;
 305         dst->len = src->len;
 306         memcpy(dst->label, src->label, src->len);
 307
 308         return dst;
 309 }
 310 static inline void nfs4_label_free(struct nfs4_label *label)
 311 {
 312         if (label) {
 313                 kfree(label->label);
 314                 kfree(label);
 315         }
 316         return;
 317 }
 318
 319 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 320 {
 321         if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
 322                 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
 323 }
 324 #else
 325 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
 326 static inline void nfs4_label_free(void *label) {}
 327 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 328 {
 329 }
 330 static inline struct nfs4_label *
 331 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 332 {
 333         return NULL;
 334 }
 335 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
 336
 337 /* proc.c */
 338 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 339 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
 340                            const struct rpc_timeout *timeparms,
 341                            const char *ip_addr);
 342
 343 /* dir.c */
 344 extern void nfs_force_use_readdirplus(struct inode *dir);
 345 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
 346                                             struct shrink_control *sc);
 347 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
 348                                            struct shrink_control *sc);
 349 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
 350 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
 351 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
 352 int nfs_rmdir(struct inode *, struct dentry *);
 353 int nfs_unlink(struct inode *, struct dentry *);
 354 int nfs_symlink(struct inode *, struct dentry *, const char *);
 355 int nfs_link(struct dentry *, struct inode *, struct dentry *);
 356 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
 357 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
 358
 359 /* file.c */
 360 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
 361 loff_t nfs_file_llseek(struct file *, loff_t, int);
 362 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
 363 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
 364                              size_t, unsigned int);
 365 int nfs_file_mmap(struct file *, struct vm_area_struct *);
 366 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
 367 int nfs_file_release(struct inode *, struct file *);
 368 int nfs_lock(struct file *, int, struct file_lock *);
 369 int nfs_flock(struct file *, int, struct file_lock *);
 370 int nfs_check_flags(int);
 371
 372 /* inode.c */
 373 extern struct workqueue_struct *nfsiod_workqueue;
 374 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 375 extern void nfs_destroy_inode(struct inode *);
 376 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 377 extern int nfs_drop_inode(struct inode *);
 378 extern void nfs_clear_inode(struct inode *);
 379 extern void nfs_evict_inode(struct inode *);
 380 void nfs_zap_acl_cache(struct inode *inode);
 381 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
 382
 383 /* super.c */
 384 extern const struct super_operations nfs_sops;
 385 extern struct file_system_type nfs_fs_type;
 386 extern struct file_system_type nfs_xdev_fs_type;
 387 #if IS_ENABLED(CONFIG_NFS_V4)
 388 extern struct file_system_type nfs4_xdev_fs_type;
 389 extern struct file_system_type nfs4_referral_fs_type;
 390 #endif
 391 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
 392 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
 393                         struct nfs_subversion *);
 394 void nfs_initialise_sb(struct super_block *);
 395 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
 396 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
 397 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
 398                                    struct nfs_mount_info *, struct nfs_subversion *);
 399 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
 400 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
 401                 const char *, struct nfs_mount_info *);
 402 void nfs_kill_super(struct super_block *);
 403 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
 404
 405 extern struct rpc_stat nfs_rpcstat;
 406
 407 extern int __init register_nfs_fs(void);
 408 extern void __exit unregister_nfs_fs(void);
 409 extern bool nfs_sb_active(struct super_block *sb);
 410 extern void nfs_sb_deactive(struct super_block *sb);
 411
 412 /* namespace.c */
 413 #define NFS_PATH_CANONICAL 1
 414 extern char *nfs_path(char **p, struct dentry *dentry,
 415                       char *buffer, ssize_t buflen, unsigned flags);
 416 extern struct vfsmount *nfs_d_automount(struct path *path);
 417 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
 418                               struct nfs_fh *, struct nfs_fattr *);
 419 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
 420                                  struct nfs_fattr *, rpc_authflavor_t);
 421
 422 /* getroot.c */
 423 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
 424                                    const char *);
 425 #if IS_ENABLED(CONFIG_NFS_V4)
 426 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
 427                                     const char *);
 428
 429 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
 430 #endif
 431
 432 struct nfs_pgio_completion_ops;
 433 /* read.c */
 434 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 435                         struct inode *inode, bool force_mds,
 436                         const struct nfs_pgio_completion_ops *compl_ops);
 437 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 438 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 439
 440 /* super.c */
 441 void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
 442 void nfs_umount_begin(struct super_block *);
 443 int  nfs_statfs(struct dentry *, struct kstatfs *);
 444 int  nfs_show_options(struct seq_file *, struct dentry *);
 445 int  nfs_show_devname(struct seq_file *, struct dentry *);
 446 int  nfs_show_path(struct seq_file *, struct dentry *);
 447 int  nfs_show_stats(struct seq_file *, struct dentry *);
 448 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
 449
 450 /* write.c */
 451 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 452                         struct inode *inode, int ioflags, bool force_mds,
 453                         const struct nfs_pgio_completion_ops *compl_ops);
 454 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
 455 extern void nfs_commit_free(struct nfs_commit_data *p);
 456 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 457 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
 458 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
 459                                struct nfs_commit_data *data,
 460                                const struct nfs_rpc_ops *nfs_ops,
 461                                const struct rpc_call_ops *call_ops,
 462                                int how, int flags);
 463 extern void nfs_init_commit(struct nfs_commit_data *data,
 464                             struct list_head *head,
 465                             struct pnfs_layout_segment *lseg,
 466                             struct nfs_commit_info *cinfo);
 467 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
 468                          struct nfs_commit_info *cinfo, int max);
 469 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
 470 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
 471                     struct nfs_commit_info *cinfo);
 472 void nfs_mark_request_commit(struct nfs_page *req,
 473                              struct pnfs_layout_segment *lseg,
 474                              struct nfs_commit_info *cinfo,
 475                              u32 ds_commit_idx);
 476 int nfs_write_need_commit(struct nfs_pgio_header *);
 477 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
 478 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
 479                             int how, struct nfs_commit_info *cinfo);
 480 void nfs_retry_commit(struct list_head *page_list,
 481                       struct pnfs_layout_segment *lseg,
 482                       struct nfs_commit_info *cinfo,
 483                       u32 ds_commit_idx);
 484 void nfs_commitdata_release(struct nfs_commit_data *data);
 485 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
 486                                  struct nfs_commit_info *cinfo);
 487 void nfs_request_add_commit_list_locked(struct nfs_page *req,
 488                 struct list_head *dst,
 489                 struct nfs_commit_info *cinfo);
 490 void nfs_request_remove_commit_list(struct nfs_page *req,
 491                                     struct nfs_commit_info *cinfo);
 492 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
 493                     struct inode *inode,
 494                     struct nfs_direct_req *dreq);
 495 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
 496 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx);
 497 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
 498
 499 #ifdef CONFIG_MIGRATION
 500 extern int nfs_migrate_page(struct address_space *,
 501                 struct page *, struct page *, enum migrate_mode);
 502 #else
 503 #define nfs_migrate_page NULL
 504 #endif
 505
 506 /* unlink.c */
 507 extern struct rpc_task *
 508 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
 509                  struct dentry *old_dentry, struct dentry *new_dentry,
 510                  void (*complete)(struct rpc_task *, struct nfs_renamedata *));
 511 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 512
 513 /* direct.c */
 514 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
 515                               struct nfs_direct_req *dreq);
 516 static inline void nfs_inode_dio_wait(struct inode *inode)
 517 {
 518         inode_dio_wait(inode);
 519 }
 520 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
 521 extern void nfs_direct_set_resched_writes(struct nfs_direct_req *dreq);
 522
 523 /* nfs4proc.c */
 524 extern void __nfs4_read_done_cb(struct nfs_pgio_header *);
 525 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 526                             const struct rpc_timeout *timeparms,
 527                             const char *ip_addr);
 528 extern int nfs40_walk_client_list(struct nfs_client *clp,
 529                                 struct nfs_client **result,
 530                                 struct rpc_cred *cred);
 531 extern int nfs41_walk_client_list(struct nfs_client *clp,
 532                                 struct nfs_client **result,
 533                                 struct rpc_cred *cred);
 534
 535 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
 536 {
 537         inode = igrab(inode);
 538         if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
 539                 iput(inode);
 540                 inode = NULL;
 541         }
 542         return inode;
 543 }
 544
 545 static inline void nfs_iput_and_deactive(struct inode *inode)
 546 {
 547         if (inode != NULL) {
 548                 struct super_block *sb = inode->i_sb;
 549
 550                 iput(inode);
 551                 nfs_sb_deactive(sb);
 552         }
 553 }
 554
 555 /*
 556  * Determine the device name as a string
 557  */
 558 static inline char *nfs_devname(struct dentry *dentry,
 559                                 char *buffer, ssize_t buflen)
 560 {
 561         char *dummy;
 562         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
 563 }
 564
 565 /*
 566  * Determine the actual block size (and log2 thereof)
 567  */
 568 static inline
 569 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 570 {
 571         /* make sure blocksize is a power of two */
 572         if ((bsize & (bsize - 1)) || nrbitsp) {
 573                 unsigned char   nrbits;
 574
 575                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 576                         ;
 577                 bsize = 1 << nrbits;
 578                 if (nrbitsp)
 579                         *nrbitsp = nrbits;
 580         }
 581
 582         return bsize;
 583 }
 584
 585 /*
 586  * Calculate the number of 512byte blocks used.
 587  */
 588 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 589 {
 590         blkcnt_t used = (tsize + 511) >> 9;
 591         return (used > ULONG_MAX) ? ULONG_MAX : used;
 592 }
 593
 594 /*
 595  * Compute and set NFS server blocksize
 596  */
 597 static inline
 598 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 599 {
 600         if (bsize < NFS_MIN_FILE_IO_SIZE)
 601                 bsize = NFS_DEF_FILE_IO_SIZE;
 602         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 603                 bsize = NFS_MAX_FILE_IO_SIZE;
 604
 605         return nfs_block_bits(bsize, nrbitsp);
 606 }
 607
 608 /*
 609  * Determine the maximum file size for a superblock
 610  */
 611 static inline
 612 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 613 {
 614         sb->s_maxbytes = (loff_t)maxfilesize;
 615         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 616                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 617 }
 618
 619 /*
 620  * Record the page as unstable and mark its inode as dirty.
 621  */
 622 static inline
 623 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
 624 {
 625         if (!cinfo->dreq) {
 626                 struct inode *inode = page_file_mapping(page)->host;
 627
 628                 inc_zone_page_state(page, NR_UNSTABLE_NFS);
 629                 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
 630                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
 631         }
 632 }
 633
 634 /*
 635  * Determine the number of bytes of data the page contains
 636  */
 637 static inline
 638 unsigned int nfs_page_length(struct page *page)
 639 {
 640         loff_t i_size = i_size_read(page_file_mapping(page)->host);
 641
 642         if (i_size > 0) {
 643                 pgoff_t page_index = page_file_index(page);
 644                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 645                 if (page_index < end_index)
 646                         return PAGE_CACHE_SIZE;
 647                 if (page_index == end_index)
 648                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 649         }
 650         return 0;
 651 }
 652
 653 /*
 654  * Convert a umode to a dirent->d_type
 655  */
 656 static inline
 657 unsigned char nfs_umode_to_dtype(umode_t mode)
 658 {
 659         return (mode >> 12) & 15;
 660 }
 661
 662 /*
 663  * Determine the number of pages in an array of length 'len' and
 664  * with a base offset of 'base'
 665  */
 666 static inline
 667 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 668 {
 669         return ((unsigned long)len + (unsigned long)base +
 670                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 671 }
 672
 673 /*
 674  * Convert a struct timespec into a 64-bit change attribute
 675  *
 676  * This does approximately the same thing as timespec_to_ns(),
 677  * but for calculation efficiency, we multiply the seconds by
 678  * 1024*1024*1024.
 679  */
 680 static inline
 681 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
 682 {
 683         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
 684 }
 685
 686 #ifdef CONFIG_CRC32
 687 /**
 688  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
 689  * @fh - pointer to filehandle
 690  *
 691  * returns a crc32 hash for the filehandle that is compatible with
 692  * the one displayed by "wireshark".
 693  */
 694 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 695 {
 696         return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
 697 }
 698 #else
 699 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 700 {
 701         return 0;
 702 }
 703 #endif