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 extern int nfs_mount(struct nfs_mount_request *info);
 157 extern void nfs_umount(const struct nfs_mount_request *info);
 158
 159 /* client.c */
 160 extern const struct rpc_program nfs_program;
 161 extern void nfs_clients_init(struct net *net);
 162 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
 163 int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
 164 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
 165                                   const struct rpc_timeout *, const char *,
 166                                   rpc_authflavor_t);
 167 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
 168 void nfs_server_insert_lists(struct nfs_server *);
 169 void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
 170 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
 171                 rpc_authflavor_t);
 172 struct nfs_server *nfs_alloc_server(void);
 173 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
 174
 175 extern void nfs_cleanup_cb_ident_idr(struct net *);
 176 extern void nfs_put_client(struct nfs_client *);
 177 extern void nfs_free_client(struct nfs_client *);
 178 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
 179 extern struct nfs_client *
 180 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
 181                                 struct nfs4_sessionid *);
 182 extern struct nfs_server *nfs_create_server(
 183                                         const struct nfs_parsed_mount_data *,
 184                                         struct nfs_fh *);
 185 extern struct nfs_server *nfs4_create_server(
 186                                         const struct nfs_parsed_mount_data *,
 187                                         struct nfs_fh *);
 188 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 189                                                       struct nfs_fh *);
 190 extern void nfs_free_server(struct nfs_server *server);
 191 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 192                                            struct nfs_fh *,
 193                                            struct nfs_fattr *,
 194                                            rpc_authflavor_t);
 195 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
 196 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 197 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
 198                                              const struct sockaddr *ds_addr,
 199                                              int ds_addrlen, int ds_proto,
 200                                              unsigned int ds_timeo,
 201                                              unsigned int ds_retrans);
 202 #ifdef CONFIG_PROC_FS
 203 extern int __init nfs_fs_proc_init(void);
 204 extern void nfs_fs_proc_exit(void);
 205 #else
 206 static inline int nfs_fs_proc_init(void)
 207 {
 208         return 0;
 209 }
 210 static inline void nfs_fs_proc_exit(void)
 211 {
 212 }
 213 #endif
 214
 215 #ifdef CONFIG_NFS_V4_1
 216 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *);
 217 #endif
 218
 219 /* callback_xdr.c */
 220 extern struct svc_version nfs4_callback_version1;
 221 extern struct svc_version nfs4_callback_version4;
 222
 223 struct nfs_pageio_descriptor;
 224 /* pagelist.c */
 225 extern int __init nfs_init_nfspagecache(void);
 226 extern void nfs_destroy_nfspagecache(void);
 227 extern int __init nfs_init_readpagecache(void);
 228 extern void nfs_destroy_readpagecache(void);
 229 extern int __init nfs_init_writepagecache(void);
 230 extern void nfs_destroy_writepagecache(void);
 231
 232 extern int __init nfs_init_directcache(void);
 233 extern void nfs_destroy_directcache(void);
 234 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
 235 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 236                               struct nfs_pgio_header *hdr,
 237                               void (*release)(struct nfs_pgio_header *hdr));
 238 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 239
 240 /* nfs2xdr.c */
 241 extern struct rpc_procinfo nfs_procedures[];
 242 extern int nfs2_decode_dirent(struct xdr_stream *,
 243                                 struct nfs_entry *, int);
 244
 245 /* nfs3xdr.c */
 246 extern struct rpc_procinfo nfs3_procedures[];
 247 extern int nfs3_decode_dirent(struct xdr_stream *,
 248                                 struct nfs_entry *, int);
 249
 250 /* nfs4xdr.c */
 251 #ifdef CONFIG_NFS_V4
 252 extern int nfs4_decode_dirent(struct xdr_stream *,
 253                                 struct nfs_entry *, int);
 254 #endif
 255 #ifdef CONFIG_NFS_V4_1
 256 extern const u32 nfs41_maxread_overhead;
 257 extern const u32 nfs41_maxwrite_overhead;
 258 #endif
 259
 260 /* nfs4proc.c */
 261 #ifdef CONFIG_NFS_V4
 262 extern struct rpc_procinfo nfs4_procedures[];
 263 #endif
 264
 265 extern int nfs4_init_ds_session(struct nfs_client *, unsigned long);
 266
 267 /* proc.c */
 268 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 269 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
 270                            const struct rpc_timeout *timeparms,
 271                            const char *ip_addr, rpc_authflavor_t authflavour);
 272
 273 /* dir.c */
 274 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
 275                                         struct shrink_control *sc);
 276 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
 277 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
 278 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
 279 int nfs_rmdir(struct inode *, struct dentry *);
 280 int nfs_unlink(struct inode *, struct dentry *);
 281 int nfs_symlink(struct inode *, struct dentry *, const char *);
 282 int nfs_link(struct dentry *, struct inode *, struct dentry *);
 283 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
 284 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
 285
 286 /* file.c */
 287 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
 288 loff_t nfs_file_llseek(struct file *, loff_t, int);
 289 int nfs_file_flush(struct file *, fl_owner_t);
 290 ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
 291 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
 292                              size_t, unsigned int);
 293 int nfs_file_mmap(struct file *, struct vm_area_struct *);
 294 ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
 295 int nfs_file_release(struct inode *, struct file *);
 296 int nfs_lock(struct file *, int, struct file_lock *);
 297 int nfs_flock(struct file *, int, struct file_lock *);
 298 ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *,
 299                               size_t, unsigned int);
 300 int nfs_check_flags(int);
 301 int nfs_setlease(struct file *, long, struct file_lock **);
 302
 303 /* inode.c */
 304 extern struct workqueue_struct *nfsiod_workqueue;
 305 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 306 extern void nfs_destroy_inode(struct inode *);
 307 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 308 extern void nfs_evict_inode(struct inode *);
 309 #ifdef CONFIG_NFS_V4
 310 extern void nfs4_evict_inode(struct inode *);
 311 #endif
 312 void nfs_zap_acl_cache(struct inode *inode);
 313 extern int nfs_wait_bit_killable(void *word);
 314
 315 /* super.c */
 316 extern struct file_system_type nfs_xdev_fs_type;
 317 #ifdef CONFIG_NFS_V4
 318 extern struct file_system_type nfs4_xdev_fs_type;
 319 extern struct file_system_type nfs4_referral_fs_type;
 320 #endif
 321
 322 extern struct rpc_stat nfs_rpcstat;
 323
 324 extern int __init register_nfs_fs(void);
 325 extern void __exit unregister_nfs_fs(void);
 326 extern void nfs_sb_active(struct super_block *sb);
 327 extern void nfs_sb_deactive(struct super_block *sb);
 328
 329 /* namespace.c */
 330 extern char *nfs_path(char **p, struct dentry *dentry,
 331                       char *buffer, ssize_t buflen);
 332 extern struct vfsmount *nfs_d_automount(struct path *path);
 333 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
 334                               struct nfs_fh *, struct nfs_fattr *);
 335 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
 336                                  struct nfs_fattr *, rpc_authflavor_t);
 337
 338 /* getroot.c */
 339 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
 340                                    const char *);
 341 #ifdef CONFIG_NFS_V4
 342 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
 343                                     const char *);
 344
 345 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
 346 #endif
 347
 348 struct nfs_pgio_completion_ops;
 349 /* read.c */
 350 extern struct nfs_read_header *nfs_readhdr_alloc(void);
 351 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
 352 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 353                         struct inode *inode,
 354                         const struct nfs_pgio_completion_ops *compl_ops);
 355 extern int nfs_initiate_read(struct rpc_clnt *clnt,
 356                              struct nfs_read_data *data,
 357                              const struct rpc_call_ops *call_ops, int flags);
 358 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 359 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
 360                               struct nfs_pgio_header *hdr);
 361 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 362                         struct inode *inode,
 363                         const struct nfs_pgio_completion_ops *compl_ops);
 364 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 365 extern void nfs_readdata_release(struct nfs_read_data *rdata);
 366
 367 /* write.c */
 368 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 369                         struct inode *inode, int ioflags,
 370                         const struct nfs_pgio_completion_ops *compl_ops);
 371 extern struct nfs_write_header *nfs_writehdr_alloc(void);
 372 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
 373 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
 374                              struct nfs_pgio_header *hdr);
 375 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 376                         struct inode *inode, int ioflags,
 377                         const struct nfs_pgio_completion_ops *compl_ops);
 378 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
 379 extern void nfs_writedata_release(struct nfs_write_data *wdata);
 380 extern void nfs_commit_free(struct nfs_commit_data *p);
 381 extern int nfs_initiate_write(struct rpc_clnt *clnt,
 382                               struct nfs_write_data *data,
 383                               const struct rpc_call_ops *call_ops,
 384                               int how, int flags);
 385 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 386 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
 387 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
 388                                struct nfs_commit_data *data,
 389                                const struct rpc_call_ops *call_ops,
 390                                int how, int flags);
 391 extern void nfs_init_commit(struct nfs_commit_data *data,
 392                             struct list_head *head,
 393                             struct pnfs_layout_segment *lseg,
 394                             struct nfs_commit_info *cinfo);
 395 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
 396                          struct nfs_commit_info *cinfo, int max);
 397 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
 398                     struct nfs_commit_info *cinfo);
 399 void nfs_mark_request_commit(struct nfs_page *req,
 400                              struct pnfs_layout_segment *lseg,
 401                              struct nfs_commit_info *cinfo);
 402 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
 403                             int how, struct nfs_commit_info *cinfo);
 404 void nfs_retry_commit(struct list_head *page_list,
 405                       struct pnfs_layout_segment *lseg,
 406                       struct nfs_commit_info *cinfo);
 407 void nfs_commitdata_release(struct nfs_commit_data *data);
 408 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
 409                                  struct nfs_commit_info *cinfo);
 410 void nfs_request_remove_commit_list(struct nfs_page *req,
 411                                     struct nfs_commit_info *cinfo);
 412 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
 413                     struct inode *inode,
 414                     struct nfs_direct_req *dreq);
 415
 416 #ifdef CONFIG_MIGRATION
 417 extern int nfs_migrate_page(struct address_space *,
 418                 struct page *, struct page *, enum migrate_mode);
 419 #else
 420 #define nfs_migrate_page NULL
 421 #endif
 422
 423 /* direct.c */
 424 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
 425                               struct nfs_direct_req *dreq);
 426 static inline void nfs_inode_dio_wait(struct inode *inode)
 427 {
 428         inode_dio_wait(inode);
 429 }
 430
 431 /* nfs4proc.c */
 432 extern void __nfs4_read_done_cb(struct nfs_read_data *);
 433 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
 434                             const struct rpc_timeout *timeparms,
 435                             const char *ip_addr,
 436                             rpc_authflavor_t authflavour);
 437 extern int _nfs4_call_sync(struct rpc_clnt *clnt,
 438                            struct nfs_server *server,
 439                            struct rpc_message *msg,
 440                            struct nfs4_sequence_args *args,
 441                            struct nfs4_sequence_res *res,
 442                            int cache_reply);
 443 extern int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 444                                    struct nfs_server *server,
 445                                    struct rpc_message *msg,
 446                                    struct nfs4_sequence_args *args,
 447                                    struct nfs4_sequence_res *res,
 448                                    int cache_reply);
 449
 450 /*
 451  * Determine the device name as a string
 452  */
 453 static inline char *nfs_devname(struct dentry *dentry,
 454                                 char *buffer, ssize_t buflen)
 455 {
 456         char *dummy;
 457         return nfs_path(&dummy, dentry, buffer, buflen);
 458 }
 459
 460 /*
 461  * Determine the actual block size (and log2 thereof)
 462  */
 463 static inline
 464 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 465 {
 466         /* make sure blocksize is a power of two */
 467         if ((bsize & (bsize - 1)) || nrbitsp) {
 468                 unsigned char   nrbits;
 469
 470                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 471                         ;
 472                 bsize = 1 << nrbits;
 473                 if (nrbitsp)
 474                         *nrbitsp = nrbits;
 475         }
 476
 477         return bsize;
 478 }
 479
 480 /*
 481  * Calculate the number of 512byte blocks used.
 482  */
 483 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 484 {
 485         blkcnt_t used = (tsize + 511) >> 9;
 486         return (used > ULONG_MAX) ? ULONG_MAX : used;
 487 }
 488
 489 /*
 490  * Compute and set NFS server blocksize
 491  */
 492 static inline
 493 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 494 {
 495         if (bsize < NFS_MIN_FILE_IO_SIZE)
 496                 bsize = NFS_DEF_FILE_IO_SIZE;
 497         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 498                 bsize = NFS_MAX_FILE_IO_SIZE;
 499
 500         return nfs_block_bits(bsize, nrbitsp);
 501 }
 502
 503 /*
 504  * Determine the maximum file size for a superblock
 505  */
 506 static inline
 507 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 508 {
 509         sb->s_maxbytes = (loff_t)maxfilesize;
 510         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 511                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 512 }
 513
 514 /*
 515  * Determine the number of bytes of data the page contains
 516  */
 517 static inline
 518 unsigned int nfs_page_length(struct page *page)
 519 {
 520         loff_t i_size = i_size_read(page->mapping->host);
 521
 522         if (i_size > 0) {
 523                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
 524                 if (page->index < end_index)
 525                         return PAGE_CACHE_SIZE;
 526                 if (page->index == end_index)
 527                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
 528         }
 529         return 0;
 530 }
 531
 532 /*
 533  * Convert a umode to a dirent->d_type
 534  */
 535 static inline
 536 unsigned char nfs_umode_to_dtype(umode_t mode)
 537 {
 538         return (mode >> 12) & 15;
 539 }
 540
 541 /*
 542  * Determine the number of pages in an array of length 'len' and
 543  * with a base offset of 'base'
 544  */
 545 static inline
 546 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 547 {
 548         return ((unsigned long)len + (unsigned long)base +
 549                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 550 }
 551
 552 /*
 553  * Convert a struct timespec into a 64-bit change attribute
 554  *
 555  * This does approximately the same thing as timespec_to_ns(),
 556  * but for calculation efficiency, we multiply the seconds by
 557  * 1024*1024*1024.
 558  */
 559 static inline
 560 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
 561 {
 562         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
 563 }