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
   9 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
  10
  11 struct nfs_string;
  12
  13 /* Maximum number of readahead requests
  14  * FIXME: this should really be a sysctl so that users may tune it to suit
  15  *        their needs. People that do NFS over a slow network, might for
  16  *        instance want to reduce it to something closer to 1 for improved
  17  *        interactive response.
  18  */
  19 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
  20
  21 /*
  22  * Determine if sessions are in use.
  23  */
  24 static inline int nfs4_has_session(const struct nfs_client *clp)
  25 {
  26 #ifdef CONFIG_NFS_V4_1
  27         if (clp->cl_session)
  28                 return 1;
  29 #endif /* CONFIG_NFS_V4_1 */
  30         return 0;
  31 }
  32
  33 static inline int nfs4_has_persistent_session(const struct nfs_client *clp)
  34 {
  35 #ifdef CONFIG_NFS_V4_1
  36         if (nfs4_has_session(clp))
  37                 return (clp->cl_session->flags & SESSION4_PERSIST);
  38 #endif /* CONFIG_NFS_V4_1 */
  39         return 0;
  40 }
  41
  42 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
  43 {
  44         if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
  45                 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
  46 }
  47
  48 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
  49 {
  50         if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
  51             (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
  52              ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
  53                 return 0;
  54
  55         fattr->fileid = fattr->mounted_on_fileid;
  56         return 1;
  57 }
  58
  59 struct nfs_clone_mount {
  60         const struct super_block *sb;
  61         const struct dentry *dentry;
  62         struct nfs_fh *fh;
  63         struct nfs_fattr *fattr;
  64         char *hostname;
  65         char *mnt_path;
  66         struct sockaddr *addr;
  67         size_t addrlen;
  68         rpc_authflavor_t authflavor;
  69 };
  70
  71 /*
  72  * Note: RFC 1813 doesn't limit the number of auth flavors that
  73  * a server can return, so make something up.
  74  */
  75 #define NFS_MAX_SECFLAVORS      (12)
  76
  77 /*
  78  * Value used if the user did not specify a port value.
  79  */
  80 #define NFS_UNSPEC_PORT         (-1)
  81
  82 /*
  83  * Maximum number of pages that readdir can use for creating
  84  * a vmapped array of pages.
  85  */
  86 #define NFS_MAX_READDIR_PAGES 8
  87
  88 struct nfs_client_initdata {
  89         unsigned long init_flags;
  90         const char *hostname;
  91         const struct sockaddr *addr;
  92         size_t addrlen;
  93         const struct nfs_rpc_ops *rpc_ops;
  94         int proto;
  95         u32 minorversion;
  96         struct net *net;
  97 };
  98
  99 /*
 100  * In-kernel mount arguments
 101  */
 102 struct nfs_parsed_mount_data {
 103         int                     flags;
 104         int                     rsize, wsize;
 105         int                     timeo, retrans;
 106         int                     acregmin, acregmax,
 107                                 acdirmin, acdirmax;
 108         int                     namlen;
 109         unsigned int            options;
 110         unsigned int            bsize;
 111         unsigned int            auth_flavor_len;
 112         rpc_authflavor_t        auth_flavors[1];
 113         char                    *client_address;
 114         unsigned int            version;
 115         unsigned int            minorversion;
 116         char                    *fscache_uniq;
 117         bool                    need_mount;
 118
 119         struct {
 120                 struct sockaddr_storage address;
 121                 size_t                  addrlen;
 122                 char                    *hostname;
 123                 u32                     version;
 124                 int                     port;
 125                 unsigned short          protocol;
 126         } mount_server;
 127
 128         struct {
 129                 struct sockaddr_storage address;
 130                 size_t                  addrlen;
 131                 char                    *hostname;
 132                 char                    *export_path;
 133                 int                     port;
 134                 unsigned short          protocol;
 135         } nfs_server;
 136
 137         struct security_mnt_opts lsm_opts;
 138         struct net              *net;
 139 };
 140
 141 /* mount_clnt.c */
 142 struct nfs_mount_request {
 143         struct sockaddr         *sap;
 144         size_t                  salen;
 145         char                    *hostname;
 146         char                    *dirpath;
 147         u32                     version;
 148         unsigned short          protocol;
 149         struct nfs_fh           *fh;
 150         int                     noresvport;
 151         unsigned int            *auth_flav_len;
 152         rpc_authflavor_t        *auth_flavs;
 153         struct net              *net;
 154 };
 155
 156 struct nfs_mount_info {
 157         void (*fill_super)(struct super_block *, struct nfs_mount_info *);
 158         int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
 159         struct nfs_parsed_mount_data *parsed;
 160         struct nfs_clone_mount *cloned;
 161         struct nfs_fh *mntfh;
 162 };
 163
 164 extern int nfs_mount(struct nfs_mount_request *info);
 165 extern void nfs_umount(const struct nfs_mount_request *info);
 166
 167 /* client.c */
 168 extern const struct rpc_program nfs_program;
 169 extern void nfs_clients_init(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 rpc_timeout *, rpc_authflavor_t);
 172 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
 173                                   const struct rpc_timeout *, const char *,
 174                                   rpc_authflavor_t);
 175 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
 176 void nfs_server_insert_lists(struct nfs_server *);
 177 void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
 178 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
 179                 rpc_authflavor_t);
 180 struct nfs_server *nfs_alloc_server(void);
 181 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
 182
 183 extern void nfs_cleanup_cb_ident_idr(struct net *);
 184 extern void nfs_put_client(struct nfs_client *);
 185 extern void nfs_free_client(struct nfs_client *);
 186 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
 187 extern struct nfs_client *
 188 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
 189                                 struct nfs4_sessionid *);
 190 extern struct nfs_server *nfs_create_server(
 191                                         const struct nfs_parsed_mount_data *,
 192                                         struct nfs_fh *);
 193 extern struct nfs_server *nfs4_create_server(
 194                                         const struct nfs_parsed_mount_data *,
 195                                         struct nfs_fh *);
 196 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 197                                                       struct nfs_fh *);
 198 extern void nfs_free_server(struct nfs_server *server);
 199 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 200                                            struct nfs_fh *,
 201                                            struct nfs_fattr *,
 202                                            rpc_authflavor_t);
 203 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
 204 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 205 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 206                                              const struct sockaddr *ds_addr,
 207                                              int ds_addrlen, int ds_proto,
 208                                              unsigned int ds_timeo,
 209                                              unsigned int ds_retrans);
 210 #ifdef CONFIG_PROC_FS
 211 extern int __init nfs_fs_proc_init(void);
 212 extern void nfs_fs_proc_exit(void);
 213 #else
 214 static inline int nfs_fs_proc_init(void)
 215 {
 216         return 0;
 217 }
 218 static inline void nfs_fs_proc_exit(void)
 219 {
 220 }
 221 #endif
 222
 223 #ifdef CONFIG_NFS_V4_1
 224 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *);
 225 #endif
 226
 227 /* callback_xdr.c */
 228 extern struct svc_version nfs4_callback_version1;
 229 extern struct svc_version nfs4_callback_version4;
 230
 231 struct nfs_pageio_descriptor;
 232 /* pagelist.c */
 233 extern int __init nfs_init_nfspagecache(void);
 234 extern void nfs_destroy_nfspagecache(void);
 235 extern int __init nfs_init_readpagecache(void);
 236 extern void nfs_destroy_readpagecache(void);
 237 extern int __init nfs_init_writepagecache(void);
 238 extern void nfs_destroy_writepagecache(void);
 239
 240 extern int __init nfs_init_directcache(void);
 241 extern void nfs_destroy_directcache(void);
 242 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
 243 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 244                               struct nfs_pgio_header *hdr,
 245                               void (*release)(struct nfs_pgio_header *hdr));
 246 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 247
 248 /* nfs2xdr.c */
 249 extern struct rpc_procinfo nfs_procedures[];
 250 extern int nfs2_decode_dirent(struct xdr_stream *,
 251                                 struct nfs_entry *, int);
 252
 253 /* nfs3xdr.c */
 254 extern struct rpc_procinfo nfs3_procedures[];
 255 extern int nfs3_decode_dirent(struct xdr_stream *,
 256                                 struct nfs_entry *, int);
 257
 258 /* nfs4xdr.c */
 259 #ifdef CONFIG_NFS_V4
 260 extern int nfs4_decode_dirent(struct xdr_stream *,
 261                                 struct nfs_entry *, int);
 262 #endif
 263 #ifdef CONFIG_NFS_V4_1
 264 extern const u32 nfs41_maxread_overhead;
 265 extern const u32 nfs41_maxwrite_overhead;
 266 #endif
 267
 268 /* nfs4proc.c */
 269 #ifdef CONFIG_NFS_V4
 270 extern struct rpc_procinfo nfs4_procedures[];
 271 #endif
 272
 273 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
 274
 275 /* proc.c */
 276 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 277 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
 278                            const struct rpc_timeout *timeparms,
 279                            const char *ip_addr, rpc_authflavor_t authflavour);
 280
 281 /* dir.c */
 282 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
 283                                         struct shrink_control *sc);
 284 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
 285 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
 286 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
 287 int nfs_rmdir(struct inode *, struct dentry *);
 288 int nfs_unlink(struct inode *, struct dentry *);
 289 int nfs_symlink(struct inode *, struct dentry *, const char *);
 290 int nfs_link(struct dentry *, struct inode *, struct dentry *);
 291 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
 292 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
 293
 294 /* file.c */
 295 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
 296 loff_t nfs_file_llseek(struct file *, loff_t, int);
 297 int nfs_file_flush(struct file *, fl_owner_t);
 298 ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
 299 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
 300                              size_t, unsigned int);
 301 int nfs_file_mmap(struct file *, struct vm_area_struct *);
 302 ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
 303 int nfs_file_release(struct inode *, struct file *);
 304 int nfs_lock(struct file *, int, struct file_lock *);
 305 int nfs_flock(struct file *, int, struct file_lock *);
 306 ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *,
 307                               size_t, unsigned int);
 308 int nfs_check_flags(int);
 309 int nfs_setlease(struct file *, long, struct file_lock **);
 310
 311 /* inode.c */
 312 extern struct workqueue_struct *nfsiod_workqueue;
 313 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 314 extern void nfs_destroy_inode(struct inode *);
 315 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 316 extern void nfs_evict_inode(struct inode *);
 317 #ifdef CONFIG_NFS_V4
 318 extern void nfs4_evict_inode(struct inode *);
 319 #endif
 320 void nfs_zap_acl_cache(struct inode *inode);
 321 extern int nfs_wait_bit_killable(void *word);
 322
 323 /* super.c */
 324 extern struct file_system_type nfs_xdev_fs_type;
 325 #ifdef CONFIG_NFS_V4
 326 extern struct file_system_type nfs4_xdev_fs_type;
 327 extern struct file_system_type nfs4_referral_fs_type;
 328 #endif
 329 void nfs_initialise_sb(struct super_block *);
 330 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
 331 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
 332 struct dentry *nfs_fs_mount_common(struct file_system_type *, struct nfs_server *,
 333                                    int, const char *, struct nfs_mount_info *);
 334 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
 335 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
 336                 const char *, struct nfs_mount_info *);
 337 void nfs_kill_super(struct super_block *);
 338 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
 339
 340 extern struct rpc_stat nfs_rpcstat;
 341
 342 extern int __init register_nfs_fs(void);
 343 extern void __exit unregister_nfs_fs(void);
 344 extern void nfs_sb_active(struct super_block *sb);
 345 extern void nfs_sb_deactive(struct super_block *sb);
 346
 347 /* namespace.c */
 348 extern char *nfs_path(char **p, struct dentry *dentry,
 349                       char *buffer, ssize_t buflen);
 350 extern struct vfsmount *nfs_d_automount(struct path *path);
 351 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
 352                               struct nfs_fh *, struct nfs_fattr *);
 353 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
 354                                  struct nfs_fattr *, rpc_authflavor_t);
 355
 356 /* getroot.c */
 357 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
 358                                    const char *);
 359 #ifdef CONFIG_NFS_V4
 360 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
 361                                     const char *);
 362
 363 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
 364 #endif
 365
 366 struct nfs_pgio_completion_ops;
 367 /* read.c */
 368 extern struct nfs_read_header *nfs_readhdr_alloc(void);
 369 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
 370 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 371                         struct inode *inode,
 372                         const struct nfs_pgio_completion_ops *compl_ops);
 373 extern int nfs_initiate_read(struct rpc_clnt *clnt,
 374                              struct nfs_read_data *data,
 375                              const struct rpc_call_ops *call_ops, int flags);
 376 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 377 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
 378                               struct nfs_pgio_header *hdr);
 379 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 380                         struct inode *inode,
 381                         const struct nfs_pgio_completion_ops *compl_ops);
 382 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 383 extern void nfs_readdata_release(struct nfs_read_data *rdata);
 384
 385 /* super.c */
 386 void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
 387 void nfs_umount_begin(struct super_block *);
 388 int  nfs_statfs(struct dentry *, struct kstatfs *);
 389 int  nfs_show_options(struct seq_file *, struct dentry *);
 390 int  nfs_show_devname(struct seq_file *, struct dentry *);
 391 int  nfs_show_path(struct seq_file *, struct dentry *);
 392 int  nfs_show_stats(struct seq_file *, struct dentry *);
 393 void nfs_put_super(struct super_block *);
 394 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
 395
 396 /* write.c */
 397 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 398                         struct inode *inode, int ioflags,
 399                         const struct nfs_pgio_completion_ops *compl_ops);
 400 extern struct nfs_write_header *nfs_writehdr_alloc(void);
 401 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
 402 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
 403                              struct nfs_pgio_header *hdr);
 404 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 405                         struct inode *inode, int ioflags,
 406                         const struct nfs_pgio_completion_ops *compl_ops);
 407 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
 408 extern void nfs_writedata_release(struct nfs_write_data *wdata);
 409 extern void nfs_commit_free(struct nfs_commit_data *p);
 410 extern int nfs_initiate_write(struct rpc_clnt *clnt,
 411                               struct nfs_write_data *data,
 412                               const struct rpc_call_ops *call_ops,
 413                               int how, int flags);
 414 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 415 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
 416 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
 417                                struct nfs_commit_data *data,
 418                                const struct rpc_call_ops *call_ops,
 419                                int how, int flags);
 420 extern void nfs_init_commit(struct nfs_commit_data *data,
 421                             struct list_head *head,
 422                             struct pnfs_layout_segment *lseg,
 423                             struct nfs_commit_info *cinfo);
 424 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
 425                          struct nfs_commit_info *cinfo, int max);
 426 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
 427                     struct nfs_commit_info *cinfo);
 428 void nfs_mark_request_commit(struct nfs_page *req,
 429                              struct pnfs_layout_segment *lseg,
 430                              struct nfs_commit_info *cinfo);
 431 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
 432                             int how, struct nfs_commit_info *cinfo);
 433 void nfs_retry_commit(struct list_head *page_list,
 434                       struct pnfs_layout_segment *lseg,
 435                       struct nfs_commit_info *cinfo);
 436 void nfs_commitdata_release(struct nfs_commit_data *data);
 437 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
 438                                  struct nfs_commit_info *cinfo);
 439 void nfs_request_remove_commit_list(struct nfs_page *req,
 440                                     struct nfs_commit_info *cinfo);
 441 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
 442                     struct inode *inode,
 443                     struct nfs_direct_req *dreq);
 444
 445 #ifdef CONFIG_MIGRATION
 446 extern int nfs_migrate_page(struct address_space *,
 447                 struct page *, struct page *, enum migrate_mode);
 448 #else
 449 #define nfs_migrate_page NULL
 450 #endif
 451
 452 /* direct.c */
 453 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
 454                               struct nfs_direct_req *dreq);
 455 static inline void nfs_inode_dio_wait(struct inode *inode)
 456 {
 457         inode_dio_wait(inode);
 458 }
 459
 460 /* nfs4proc.c */
 461 extern void __nfs4_read_done_cb(struct nfs_read_data *);
 462 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 463                             const struct rpc_timeout *timeparms,
 464                             const char *ip_addr,
 465                             rpc_authflavor_t authflavour);
 466 extern int _nfs4_call_sync(struct rpc_clnt *clnt,
 467                            struct nfs_server *server,
 468                            struct rpc_message *msg,
 469                            struct nfs4_sequence_args *args,
 470                            struct nfs4_sequence_res *res,
 471                            int cache_reply);
 472 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 473                                    struct nfs_server *server,
 474                                    struct rpc_message *msg,
 475                                    struct nfs4_sequence_args *args,
 476                                    struct nfs4_sequence_res *res,
 477                                    int cache_reply);
 478
 479 /*
 480  * Determine the device name as a string
 481  */
 482 static inline char *nfs_devname(struct dentry *dentry,
 483                                 char *buffer, ssize_t buflen)
 484 {
 485         char *dummy;
 486         return nfs_path(&dummy, dentry, buffer, buflen);
 487 }
 488
 489 /*
 490  * Determine the actual block size (and log2 thereof)
 491  */
 492 static inline
 493 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 494 {
 495         /* make sure blocksize is a power of two */
 496         if ((bsize & (bsize - 1)) || nrbitsp) {
 497                 unsigned char   nrbits;
 498
 499                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 500                         ;
 501                 bsize = 1 << nrbits;
 502                 if (nrbitsp)
 503                         *nrbitsp = nrbits;
 504         }
 505
 506         return bsize;
 507 }
 508
 509 /*
 510  * Calculate the number of 512byte blocks used.
 511  */
 512 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 513 {
 514         blkcnt_t used = (tsize + 511) >> 9;
 515         return (used > ULONG_MAX) ? ULONG_MAX : used;
 516 }
 517
 518 /*
 519  * Compute and set NFS server blocksize
 520  */
 521 static inline
 522 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 523 {
 524         if (bsize < NFS_MIN_FILE_IO_SIZE)
 525                 bsize = NFS_DEF_FILE_IO_SIZE;
 526         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 527                 bsize = NFS_MAX_FILE_IO_SIZE;
 528
 529         return nfs_block_bits(bsize, nrbitsp);
 530 }
 531
 532 /*
 533  * Determine the maximum file size for a superblock
 534  */
 535 static inline
 536 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 537 {
 538         sb->s_maxbytes = (loff_t)maxfilesize;
 539         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 540                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 541 }
 542
 543 /*
 544  * Determine the number of bytes of data the page contains
 545  */
 546 static inline
 547 unsigned int nfs_page_length(struct page *page)
 548 {
 549         loff_t i_size = i_size_read(page->mapping->host);
 550
 551         if (i_size > 0) {
 552                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 553                 if (page->index < end_index)
 554                         return PAGE_CACHE_SIZE;
 555                 if (page->index == end_index)
 556                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 557         }
 558         return 0;
 559 }
 560
 561 /*
 562  * Convert a umode to a dirent->d_type
 563  */
 564 static inline
 565 unsigned char nfs_umode_to_dtype(umode_t mode)
 566 {
 567         return (mode >> 12) & 15;
 568 }
 569
 570 /*
 571  * Determine the number of pages in an array of length 'len' and
 572  * with a base offset of 'base'
 573  */
 574 static inline
 575 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 576 {
 577         return ((unsigned long)len + (unsigned long)base +
 578                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 579 }
 580
 581 /*
 582  * Convert a struct timespec into a 64-bit change attribute
 583  *
 584  * This does approximately the same thing as timespec_to_ns(),
 585  * but for calculation efficiency, we multiply the seconds by
 586  * 1024*1024*1024.
 587  */
 588 static inline
 589 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
 590 {
 591         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
 592 }