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 #define NFS_UNSPEC_RETRANS      (UINT_MAX)
  62 #define NFS_UNSPEC_TIMEO        (UINT_MAX)
  63
  64 /*
  65  * Maximum number of pages that readdir can use for creating
  66  * a vmapped array of pages.
  67  */
  68 #define NFS_MAX_READDIR_PAGES 8
  69
  70 struct nfs_client_initdata {
  71         unsigned long init_flags;
  72         const char *hostname;                   /* Hostname of the server */
  73         const struct sockaddr *addr;            /* Address of the server */
  74         const char *nodename;                   /* Hostname of the client */
  75         const char *ip_addr;                    /* IP address of the client */
  76         size_t addrlen;
  77         struct nfs_subversion *nfs_mod;
  78         int proto;
  79         u32 minorversion;
  80         struct net *net;
  81         const struct rpc_timeout *timeparms;
  82 };
  83
  84 /*
  85  * In-kernel mount arguments
  86  */
  87 struct nfs_parsed_mount_data {
  88         int                     flags;
  89         unsigned int            rsize, wsize;
  90         unsigned int            timeo, retrans;
  91         unsigned int            acregmin, acregmax,
  92                                 acdirmin, acdirmax;
  93         unsigned int            namlen;
  94         unsigned int            options;
  95         unsigned int            bsize;
  96         struct nfs_auth_info    auth_info;
  97         rpc_authflavor_t        selected_flavor;
  98         char                    *client_address;
  99         unsigned int            version;
 100         unsigned int            minorversion;
 101         char                    *fscache_uniq;
 102         bool                    need_mount;
 103
 104         struct {
 105                 struct sockaddr_storage address;
 106                 size_t                  addrlen;
 107                 char                    *hostname;
 108                 u32                     version;
 109                 int                     port;
 110                 unsigned short          protocol;
 111         } mount_server;
 112
 113         struct {
 114                 struct sockaddr_storage address;
 115                 size_t                  addrlen;
 116                 char                    *hostname;
 117                 char                    *export_path;
 118                 int                     port;
 119                 unsigned short          protocol;
 120         } nfs_server;
 121
 122         struct security_mnt_opts lsm_opts;
 123         struct net              *net;
 124 };
 125
 126 /* mount_clnt.c */
 127 struct nfs_mount_request {
 128         struct sockaddr         *sap;
 129         size_t                  salen;
 130         char                    *hostname;
 131         char                    *dirpath;
 132         u32                     version;
 133         unsigned short          protocol;
 134         struct nfs_fh           *fh;
 135         int                     noresvport;
 136         unsigned int            *auth_flav_len;
 137         rpc_authflavor_t        *auth_flavs;
 138         struct net              *net;
 139 };
 140
 141 struct nfs_mount_info {
 142         void (*fill_super)(struct super_block *, struct nfs_mount_info *);
 143         int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
 144         struct nfs_parsed_mount_data *parsed;
 145         struct nfs_clone_mount *cloned;
 146         struct nfs_fh *mntfh;
 147 };
 148
 149 extern int nfs_mount(struct nfs_mount_request *info);
 150 extern void nfs_umount(const struct nfs_mount_request *info);
 151
 152 /* client.c */
 153 extern const struct rpc_program nfs_program;
 154 extern void nfs_clients_init(struct net *net);
 155 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
 156 int nfs_create_rpc_client(struct nfs_client *, const struct nfs_client_initdata *, rpc_authflavor_t);
 157 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
 158                                   rpc_authflavor_t);
 159 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
 160 void nfs_server_insert_lists(struct nfs_server *);
 161 void nfs_server_remove_lists(struct nfs_server *);
 162 void nfs_init_timeout_values(struct rpc_timeout *to, int proto, int timeo, int retrans);
 163 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
 164                 rpc_authflavor_t);
 165 struct nfs_server *nfs_alloc_server(void);
 166 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
 167
 168 extern void nfs_cleanup_cb_ident_idr(struct net *);
 169 extern void nfs_put_client(struct nfs_client *);
 170 extern void nfs_free_client(struct nfs_client *);
 171 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
 172 extern struct nfs_client *
 173 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
 174                                 struct nfs4_sessionid *, u32);
 175 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
 176                                         struct nfs_subversion *);
 177 extern struct nfs_server *nfs4_create_server(
 178                                         struct nfs_mount_info *,
 179                                         struct nfs_subversion *);
 180 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
 181                                                       struct nfs_fh *);
 182 extern int nfs4_update_server(struct nfs_server *server, const char *hostname,
 183                                         struct sockaddr *sap, size_t salen,
 184                                         struct net *net);
 185 extern void nfs_free_server(struct nfs_server *server);
 186 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
 187                                            struct nfs_fh *,
 188                                            struct nfs_fattr *,
 189                                            rpc_authflavor_t);
 190 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
 191 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
 192 extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 193                                              const struct sockaddr *ds_addr,
 194                                              int ds_addrlen, int ds_proto,
 195                                              unsigned int ds_timeo,
 196                                              unsigned int ds_retrans,
 197                                              u32 minor_version,
 198                                              rpc_authflavor_t au_flavor);
 199 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
 200                                                 struct inode *);
 201 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
 202                         const struct sockaddr *ds_addr, int ds_addrlen,
 203                         int ds_proto, unsigned int ds_timeo,
 204                         unsigned int ds_retrans, rpc_authflavor_t au_flavor);
 205 #ifdef CONFIG_PROC_FS
 206 extern int __init nfs_fs_proc_init(void);
 207 extern void nfs_fs_proc_exit(void);
 208 extern int nfs_fs_proc_net_init(struct net *net);
 209 extern void nfs_fs_proc_net_exit(struct net *net);
 210 #else
 211 static inline int nfs_fs_proc_net_init(struct net *net)
 212 {
 213         return 0;
 214 }
 215 static inline void nfs_fs_proc_net_exit(struct net *net)
 216 {
 217 }
 218 static inline int nfs_fs_proc_init(void)
 219 {
 220         return 0;
 221 }
 222 static inline void nfs_fs_proc_exit(void)
 223 {
 224 }
 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 void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
 243                               struct nfs_pgio_header *hdr,
 244                               void (*release)(struct nfs_pgio_header *hdr));
 245 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
 246 int nfs_iocounter_wait(struct nfs_lock_context *l_ctx);
 247
 248 extern const struct nfs_pageio_ops nfs_pgio_rw_ops;
 249 struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *);
 250 void nfs_pgio_header_free(struct nfs_pgio_header *);
 251 void nfs_pgio_data_destroy(struct nfs_pgio_header *);
 252 int nfs_generic_pgio(struct nfs_pageio_descriptor *, struct nfs_pgio_header *);
 253 int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr,
 254                       struct rpc_cred *cred, const struct nfs_rpc_ops *rpc_ops,
 255                       const struct rpc_call_ops *call_ops, int how, int flags);
 256 void nfs_free_request(struct nfs_page *req);
 257 struct nfs_pgio_mirror *
 258 nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc);
 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 static inline bool nfs_match_open_context(const struct nfs_open_context *ctx1,
 267                 const struct nfs_open_context *ctx2)
 268 {
 269         return ctx1->cred == ctx2->cred && ctx1->state == ctx2->state;
 270 }
 271
 272 /* nfs2xdr.c */
 273 extern struct rpc_procinfo nfs_procedures[];
 274 extern int nfs2_decode_dirent(struct xdr_stream *,
 275                                 struct nfs_entry *, int);
 276
 277 /* nfs3xdr.c */
 278 extern struct rpc_procinfo nfs3_procedures[];
 279 extern int nfs3_decode_dirent(struct xdr_stream *,
 280                                 struct nfs_entry *, int);
 281
 282 /* nfs4xdr.c */
 283 #if IS_ENABLED(CONFIG_NFS_V4)
 284 extern int nfs4_decode_dirent(struct xdr_stream *,
 285                                 struct nfs_entry *, int);
 286 #endif
 287 #ifdef CONFIG_NFS_V4_1
 288 extern const u32 nfs41_maxread_overhead;
 289 extern const u32 nfs41_maxwrite_overhead;
 290 extern const u32 nfs41_maxgetdevinfo_overhead;
 291 #endif
 292
 293 /* nfs4proc.c */
 294 #if IS_ENABLED(CONFIG_NFS_V4)
 295 extern struct rpc_procinfo nfs4_procedures[];
 296 #endif
 297
 298 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 299 extern struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags);
 300 static inline struct nfs4_label *
 301 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 302 {
 303         if (!dst || !src)
 304                 return NULL;
 305
 306         if (src->len > NFS4_MAXLABELLEN)
 307                 return NULL;
 308
 309         dst->lfs = src->lfs;
 310         dst->pi = src->pi;
 311         dst->len = src->len;
 312         memcpy(dst->label, src->label, src->len);
 313
 314         return dst;
 315 }
 316 static inline void nfs4_label_free(struct nfs4_label *label)
 317 {
 318         if (label) {
 319                 kfree(label->label);
 320                 kfree(label);
 321         }
 322         return;
 323 }
 324
 325 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 326 {
 327         if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
 328                 nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
 329 }
 330 #else
 331 static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
 332 static inline void nfs4_label_free(void *label) {}
 333 static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
 334 {
 335 }
 336 static inline struct nfs4_label *
 337 nfs4_label_copy(struct nfs4_label *dst, struct nfs4_label *src)
 338 {
 339         return NULL;
 340 }
 341 #endif /* CONFIG_NFS_V4_SECURITY_LABEL */
 342
 343 /* proc.c */
 344 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
 345 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
 346                            const struct nfs_client_initdata *);
 347
 348 /* dir.c */
 349 extern void nfs_force_use_readdirplus(struct inode *dir);
 350 extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
 351                                             struct shrink_control *sc);
 352 extern unsigned long nfs_access_cache_scan(struct shrinker *shrink,
 353                                            struct shrink_control *sc);
 354 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
 355 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
 356 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
 357 int nfs_rmdir(struct inode *, struct dentry *);
 358 int nfs_unlink(struct inode *, struct dentry *);
 359 int nfs_symlink(struct inode *, struct dentry *, const char *);
 360 int nfs_link(struct dentry *, struct inode *, struct dentry *);
 361 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
 362 int nfs_rename(struct inode *, struct dentry *,
 363                struct inode *, struct dentry *, unsigned int);
 364
 365 /* file.c */
 366 int nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
 367 loff_t nfs_file_llseek(struct file *, loff_t, int);
 368 ssize_t nfs_file_read(struct kiocb *, struct iov_iter *);
 369 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
 370                              size_t, unsigned int);
 371 int nfs_file_mmap(struct file *, struct vm_area_struct *);
 372 ssize_t nfs_file_write(struct kiocb *, struct iov_iter *);
 373 int nfs_file_release(struct inode *, struct file *);
 374 int nfs_lock(struct file *, int, struct file_lock *);
 375 int nfs_flock(struct file *, int, struct file_lock *);
 376 int nfs_check_flags(int);
 377
 378 /* inode.c */
 379 extern struct workqueue_struct *nfsiod_workqueue;
 380 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 381 extern void nfs_destroy_inode(struct inode *);
 382 extern int nfs_write_inode(struct inode *, struct writeback_control *);
 383 extern int nfs_drop_inode(struct inode *);
 384 extern void nfs_clear_inode(struct inode *);
 385 extern void nfs_evict_inode(struct inode *);
 386 void nfs_zap_acl_cache(struct inode *inode);
 387 extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
 388 extern int nfs_wait_atomic_killable(atomic_t *p);
 389
 390 /* super.c */
 391 extern const struct super_operations nfs_sops;
 392 extern struct file_system_type nfs_fs_type;
 393 extern struct file_system_type nfs_xdev_fs_type;
 394 #if IS_ENABLED(CONFIG_NFS_V4)
 395 extern struct file_system_type nfs4_xdev_fs_type;
 396 extern struct file_system_type nfs4_referral_fs_type;
 397 #endif
 398 bool nfs_auth_info_match(const struct nfs_auth_info *, rpc_authflavor_t);
 399 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
 400                         struct nfs_subversion *);
 401 void nfs_initialise_sb(struct super_block *);
 402 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
 403 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
 404 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
 405                                    struct nfs_mount_info *, struct nfs_subversion *);
 406 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
 407 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
 408                 const char *, struct nfs_mount_info *);
 409 void nfs_kill_super(struct super_block *);
 410 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
 411
 412 extern struct rpc_stat nfs_rpcstat;
 413
 414 extern int __init register_nfs_fs(void);
 415 extern void __exit unregister_nfs_fs(void);
 416 extern bool nfs_sb_active(struct super_block *sb);
 417 extern void nfs_sb_deactive(struct super_block *sb);
 418
 419 /* io.c */
 420 extern void nfs_start_io_read(struct inode *inode);
 421 extern void nfs_end_io_read(struct inode *inode);
 422 extern void nfs_start_io_write(struct inode *inode);
 423 extern void nfs_end_io_write(struct inode *inode);
 424 extern void nfs_start_io_direct(struct inode *inode);
 425 extern void nfs_end_io_direct(struct inode *inode);
 426
 427 static inline bool nfs_file_io_is_buffered(struct nfs_inode *nfsi)
 428 {
 429         return test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0;
 430 }
 431
 432 /* namespace.c */
 433 #define NFS_PATH_CANONICAL 1
 434 extern char *nfs_path(char **p, struct dentry *dentry,
 435                       char *buffer, ssize_t buflen, unsigned flags);
 436 extern struct vfsmount *nfs_d_automount(struct path *path);
 437 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
 438                               struct nfs_fh *, struct nfs_fattr *);
 439 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
 440                                  struct nfs_fattr *, rpc_authflavor_t);
 441
 442 /* getroot.c */
 443 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
 444                                    const char *);
 445 #if IS_ENABLED(CONFIG_NFS_V4)
 446 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
 447                                     const char *);
 448
 449 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool);
 450 #endif
 451
 452 struct nfs_pgio_completion_ops;
 453 /* read.c */
 454 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
 455                         struct inode *inode, bool force_mds,
 456                         const struct nfs_pgio_completion_ops *compl_ops);
 457 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
 458 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
 459
 460 /* super.c */
 461 void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
 462 void nfs_umount_begin(struct super_block *);
 463 int  nfs_statfs(struct dentry *, struct kstatfs *);
 464 int  nfs_show_options(struct seq_file *, struct dentry *);
 465 int  nfs_show_devname(struct seq_file *, struct dentry *);
 466 int  nfs_show_path(struct seq_file *, struct dentry *);
 467 int  nfs_show_stats(struct seq_file *, struct dentry *);
 468 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
 469
 470 /* write.c */
 471 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
 472                         struct inode *inode, int ioflags, bool force_mds,
 473                         const struct nfs_pgio_completion_ops *compl_ops);
 474 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
 475 extern void nfs_commit_free(struct nfs_commit_data *p);
 476 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
 477 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
 478 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
 479                                struct nfs_commit_data *data,
 480                                const struct nfs_rpc_ops *nfs_ops,
 481                                const struct rpc_call_ops *call_ops,
 482                                int how, int flags);
 483 extern void nfs_init_commit(struct nfs_commit_data *data,
 484                             struct list_head *head,
 485                             struct pnfs_layout_segment *lseg,
 486                             struct nfs_commit_info *cinfo);
 487 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
 488                          struct nfs_commit_info *cinfo, int max);
 489 unsigned long nfs_reqs_to_commit(struct nfs_commit_info *);
 490 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
 491                     struct nfs_commit_info *cinfo);
 492 void nfs_mark_request_commit(struct nfs_page *req,
 493                              struct pnfs_layout_segment *lseg,
 494                              struct nfs_commit_info *cinfo,
 495                              u32 ds_commit_idx);
 496 int nfs_write_need_commit(struct nfs_pgio_header *);
 497 void nfs_writeback_update_inode(struct nfs_pgio_header *hdr);
 498 int nfs_commit_file(struct file *file, struct nfs_write_verifier *verf);
 499 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
 500                             int how, struct nfs_commit_info *cinfo);
 501 void nfs_retry_commit(struct list_head *page_list,
 502                       struct pnfs_layout_segment *lseg,
 503                       struct nfs_commit_info *cinfo,
 504                       u32 ds_commit_idx);
 505 void nfs_commitdata_release(struct nfs_commit_data *data);
 506 void nfs_request_add_commit_list(struct nfs_page *req,
 507                                  struct nfs_commit_info *cinfo);
 508 void nfs_request_add_commit_list_locked(struct nfs_page *req,
 509                 struct list_head *dst,
 510                 struct nfs_commit_info *cinfo);
 511 void nfs_request_remove_commit_list(struct nfs_page *req,
 512                                     struct nfs_commit_info *cinfo);
 513 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
 514                     struct inode *inode,
 515                     struct nfs_direct_req *dreq);
 516 int nfs_key_timeout_notify(struct file *filp, struct inode *inode);
 517 bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx, struct inode *inode);
 518 void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio);
 519
 520 int nfs_filemap_write_and_wait_range(struct address_space *mapping,
 521                 loff_t lstart, loff_t lend);
 522
 523 #ifdef CONFIG_NFS_V4_1
 524 static inline
 525 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
 526 {
 527         int i;
 528
 529         for (i = 0; i < cinfo->nbuckets; i++)
 530                 cinfo->buckets[i].direct_verf.committed = NFS_INVALID_STABLE_HOW;
 531 }
 532 #else
 533 static inline
 534 void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
 535 {
 536 }
 537 #endif
 538
 539
 540 #ifdef CONFIG_MIGRATION
 541 extern int nfs_migrate_page(struct address_space *,
 542                 struct page *, struct page *, enum migrate_mode);
 543 #else
 544 #define nfs_migrate_page NULL
 545 #endif
 546
 547 static inline int
 548 nfs_write_verifier_cmp(const struct nfs_write_verifier *v1,
 549                 const struct nfs_write_verifier *v2)
 550 {
 551         return memcmp(v1->data, v2->data, sizeof(v1->data));
 552 }
 553
 554 /* unlink.c */
 555 extern struct rpc_task *
 556 nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
 557                  struct dentry *old_dentry, struct dentry *new_dentry,
 558                  void (*complete)(struct rpc_task *, struct nfs_renamedata *));
 559 extern int nfs_sillyrename(struct inode *dir, struct dentry *dentry);
 560
 561 /* direct.c */
 562 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
 563                               struct nfs_direct_req *dreq);
 564 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
 565
 566 /* nfs4proc.c */
 567 extern void __nfs4_read_done_cb(struct nfs_pgio_header *);
 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                                 struct rpc_cred *cred);
 573 extern int nfs41_walk_client_list(struct nfs_client *clp,
 574                                 struct nfs_client **result,
 575                                 struct rpc_cred *cred);
 576
 577 static inline struct inode *nfs_igrab_and_active(struct inode *inode)
 578 {
 579         inode = igrab(inode);
 580         if (inode != NULL && !nfs_sb_active(inode->i_sb)) {
 581                 iput(inode);
 582                 inode = NULL;
 583         }
 584         return inode;
 585 }
 586
 587 static inline void nfs_iput_and_deactive(struct inode *inode)
 588 {
 589         if (inode != NULL) {
 590                 struct super_block *sb = inode->i_sb;
 591
 592                 iput(inode);
 593                 nfs_sb_deactive(sb);
 594         }
 595 }
 596
 597 /*
 598  * Determine the device name as a string
 599  */
 600 static inline char *nfs_devname(struct dentry *dentry,
 601                                 char *buffer, ssize_t buflen)
 602 {
 603         char *dummy;
 604         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
 605 }
 606
 607 /*
 608  * Determine the actual block size (and log2 thereof)
 609  */
 610 static inline
 611 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
 612 {
 613         /* make sure blocksize is a power of two */
 614         if ((bsize & (bsize - 1)) || nrbitsp) {
 615                 unsigned char   nrbits;
 616
 617                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
 618                         ;
 619                 bsize = 1 << nrbits;
 620                 if (nrbitsp)
 621                         *nrbitsp = nrbits;
 622         }
 623
 624         return bsize;
 625 }
 626
 627 /*
 628  * Calculate the number of 512byte blocks used.
 629  */
 630 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
 631 {
 632         blkcnt_t used = (tsize + 511) >> 9;
 633         return (used > ULONG_MAX) ? ULONG_MAX : used;
 634 }
 635
 636 /*
 637  * Compute and set NFS server blocksize
 638  */
 639 static inline
 640 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
 641 {
 642         if (bsize < NFS_MIN_FILE_IO_SIZE)
 643                 bsize = NFS_DEF_FILE_IO_SIZE;
 644         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
 645                 bsize = NFS_MAX_FILE_IO_SIZE;
 646
 647         return nfs_block_bits(bsize, nrbitsp);
 648 }
 649
 650 /*
 651  * Determine the maximum file size for a superblock
 652  */
 653 static inline
 654 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
 655 {
 656         sb->s_maxbytes = (loff_t)maxfilesize;
 657         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
 658                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 659 }
 660
 661 /*
 662  * Record the page as unstable and mark its inode as dirty.
 663  */
 664 static inline
 665 void nfs_mark_page_unstable(struct page *page, struct nfs_commit_info *cinfo)
 666 {
 667         if (!cinfo->dreq) {
 668                 struct inode *inode = page_file_mapping(page)->host;
 669
 670                 inc_node_page_state(page, NR_UNSTABLE_NFS);
 671                 inc_wb_stat(&inode_to_bdi(inode)->wb, WB_RECLAIMABLE);
 672                 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
 673         }
 674 }
 675
 676 /*
 677  * Determine the number of bytes of data the page contains
 678  */
 679 static inline
 680 unsigned int nfs_page_length(struct page *page)
 681 {
 682         loff_t i_size = i_size_read(page_file_mapping(page)->host);
 683
 684         if (i_size > 0) {
 685                 pgoff_t page_index = page_file_index(page);
 686                 pgoff_t end_index = (i_size - 1) >> PAGE_SHIFT;
 687                 if (page_index < end_index)
 688                         return PAGE_SIZE;
 689                 if (page_index == end_index)
 690                         return ((i_size - 1) & ~PAGE_MASK) + 1;
 691         }
 692         return 0;
 693 }
 694
 695 /*
 696  * Convert a umode to a dirent->d_type
 697  */
 698 static inline
 699 unsigned char nfs_umode_to_dtype(umode_t mode)
 700 {
 701         return (mode >> 12) & 15;
 702 }
 703
 704 /*
 705  * Determine the number of pages in an array of length 'len' and
 706  * with a base offset of 'base'
 707  */
 708 static inline
 709 unsigned int nfs_page_array_len(unsigned int base, size_t len)
 710 {
 711         return ((unsigned long)len + (unsigned long)base +
 712                 PAGE_SIZE - 1) >> PAGE_SHIFT;
 713 }
 714
 715 /*
 716  * Convert a struct timespec into a 64-bit change attribute
 717  *
 718  * This does approximately the same thing as timespec_to_ns(),
 719  * but for calculation efficiency, we multiply the seconds by
 720  * 1024*1024*1024.
 721  */
 722 static inline
 723 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
 724 {
 725         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
 726 }
 727
 728 #ifdef CONFIG_CRC32
 729 /**
 730  * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
 731  * @fh - pointer to filehandle
 732  *
 733  * returns a crc32 hash for the filehandle that is compatible with
 734  * the one displayed by "wireshark".
 735  */
 736 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 737 {
 738         return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
 739 }
 740 static inline u32 nfs_stateid_hash(const nfs4_stateid *stateid)
 741 {
 742         return ~crc32_le(0xFFFFFFFF, &stateid->other[0],
 743                                 NFS4_STATEID_OTHER_SIZE);
 744 }
 745 #else
 746 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
 747 {
 748         return 0;
 749 }
 750 static inline u32 nfs_stateid_hash(nfs4_stateid *stateid)
 751 {
 752         return 0;
 753 }
 754 #endif
 755
 756 static inline bool nfs_error_is_fatal(int err)
 757 {
 758         switch (err) {
 759         case -ERESTARTSYS:
 760         case -EIO:
 761         case -ENOSPC:
 762         case -EROFS:
 763         case -E2BIG:
 764                 return true;
 765         default:
 766                 return false;
 767         }
 768 }