fs/nfs/pnfs.h

   1 /*
   2  *  pNFS client data structures.
   3  *
   4  *  Copyright (c) 2002
   5  *  The Regents of the University of Michigan
   6  *  All Rights Reserved
   7  *
   8  *  Dean Hildebrand <dhildebz@umich.edu>
   9  *
  10  *  Permission is granted to use, copy, create derivative works, and
  11  *  redistribute this software and such derivative works for any purpose,
  12  *  so long as the name of the University of Michigan is not used in
  13  *  any advertising or publicity pertaining to the use or distribution
  14  *  of this software without specific, written prior authorization. If
  15  *  the above copyright notice or any other identification of the
  16  *  University of Michigan is included in any copy of any portion of
  17  *  this software, then the disclaimer below must also be included.
  18  *
  19  *  This software is provided as is, without representation or warranty
  20  *  of any kind either express or implied, including without limitation
  21  *  the implied warranties of merchantability, fitness for a particular
  22  *  purpose, or noninfringement.  The Regents of the University of
  23  *  Michigan shall not be liable for any damages, including special,
  24  *  indirect, incidental, or consequential damages, with respect to any
  25  *  claim arising out of or in connection with the use of the software,
  26  *  even if it has been or is hereafter advised of the possibility of
  27  *  such damages.
  28  */
  29
  30 #ifndef FS_NFS_PNFS_H
  31 #define FS_NFS_PNFS_H
  32
  33 #include <linux/nfs_fs.h>
  34 #include <linux/nfs_page.h>
  35 #include <linux/workqueue.h>
  36
  37 enum {
  38         NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
  39         NFS_LSEG_ROC,           /* roc bit received from server */
  40         NFS_LSEG_LAYOUTCOMMIT,  /* layoutcommit bit set for layoutcommit */
  41         NFS_LSEG_LAYOUTRETURN,  /* layoutreturn bit set for layoutreturn */
  42 };
  43
  44 /* Individual ip address */
  45 struct nfs4_pnfs_ds_addr {
  46         struct sockaddr_storage da_addr;
  47         size_t                  da_addrlen;
  48         struct list_head        da_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  49         char                    *da_remotestr;  /* human readable addr+port */
  50 };
  51
  52 struct nfs4_pnfs_ds {
  53         struct list_head        ds_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  54         char                    *ds_remotestr;  /* comma sep list of addrs */
  55         struct list_head        ds_addrs;
  56         struct nfs_client       *ds_clp;
  57         atomic_t                ds_count;
  58         unsigned long           ds_state;
  59 #define NFS4DS_CONNECTING       0       /* ds is establishing connection */
  60 };
  61
  62 struct pnfs_layout_segment {
  63         struct list_head pls_list;
  64         struct list_head pls_lc_list;
  65         struct pnfs_layout_range pls_range;
  66         atomic_t pls_refcount;
  67         unsigned long pls_flags;
  68         struct pnfs_layout_hdr *pls_layout;
  69         struct work_struct pls_work;
  70 };
  71
  72 enum pnfs_try_status {
  73         PNFS_ATTEMPTED     = 0,
  74         PNFS_NOT_ATTEMPTED = 1,
  75 };
  76
  77 #ifdef CONFIG_NFS_V4_1
  78
  79 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
  80
  81 /*
  82  * Default data server connection timeout and retrans vaules.
  83  * Set by module parameters dataserver_timeo and dataserver_retrans.
  84  */
  85 #define NFS4_DEF_DS_TIMEO   600 /* in tenths of a second */
  86 #define NFS4_DEF_DS_RETRANS 5
  87
  88 /* error codes for internal use */
  89 #define NFS4ERR_RESET_TO_MDS   12001
  90 #define NFS4ERR_RESET_TO_PNFS  12002
  91
  92 enum {
  93         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
  94         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
  95         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
  96         NFS_LAYOUT_ROC,                 /* some lseg had roc bit set */
  97         NFS_LAYOUT_RETURN,              /* Return this layout ASAP */
  98         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
  99         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first layoutget */
 100 };
 101
 102 enum layoutdriver_policy_flags {
 103         /* Should the pNFS client commit and return the layout upon truncate to
 104          * a smaller size */
 105         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
 106         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
 107         PNFS_READ_WHOLE_PAGE            = 1 << 2,
 108 };
 109
 110 struct nfs4_deviceid_node;
 111
 112 /* Per-layout driver specific registration structure */
 113 struct pnfs_layoutdriver_type {
 114         struct list_head pnfs_tblid;
 115         const u32 id;
 116         const char *name;
 117         struct module *owner;
 118         unsigned flags;
 119         unsigned max_deviceinfo_size;
 120
 121         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
 122         int (*clear_layoutdriver) (struct nfs_server *);
 123
 124         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
 125         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
 126
 127         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
 128         void (*free_lseg) (struct pnfs_layout_segment *lseg);
 129
 130         void (*return_range) (struct pnfs_layout_hdr *lo,
 131                               struct pnfs_layout_range *range);
 132
 133         /* test for nfs page cache coalescing */
 134         const struct nfs_pageio_ops *pg_read_ops;
 135         const struct nfs_pageio_ops *pg_write_ops;
 136
 137         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
 138         void (*mark_request_commit) (struct nfs_page *req,
 139                                      struct pnfs_layout_segment *lseg,
 140                                      struct nfs_commit_info *cinfo);
 141         void (*clear_request_commit) (struct nfs_page *req,
 142                                       struct nfs_commit_info *cinfo);
 143         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 144                                   int max);
 145         void (*recover_commit_reqs) (struct list_head *list,
 146                                      struct nfs_commit_info *cinfo);
 147         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
 148                                                 struct page *page);
 149         int (*commit_pagelist)(struct inode *inode,
 150                                struct list_head *mds_pages,
 151                                int how,
 152                                struct nfs_commit_info *cinfo);
 153
 154         /*
 155          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 156          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 157          */
 158         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 159         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 160
 161         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 162         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 163                         (struct nfs_server *server, struct pnfs_device *pdev,
 164                         gfp_t gfp_flags);
 165
 166         void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
 167                                      struct xdr_stream *xdr,
 168                                      const struct nfs4_layoutreturn_args *args);
 169
 170         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 171         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
 172         void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
 173                                      struct xdr_stream *xdr,
 174                                      const struct nfs4_layoutcommit_args *args);
 175 };
 176
 177 struct pnfs_layout_hdr {
 178         atomic_t                plh_refcount;
 179         struct list_head        plh_layouts;   /* other client layouts */
 180         struct list_head        plh_bulk_destroy;
 181         struct list_head        plh_segs;      /* layout segments list */
 182         nfs4_stateid            plh_stateid;
 183         atomic_t                plh_outstanding; /* number of RPCs out */
 184         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 185         u32                     plh_barrier; /* ignore lower seqids */
 186         unsigned long           plh_retry_timestamp;
 187         unsigned long           plh_flags;
 188         enum pnfs_iomode        plh_return_iomode;
 189         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 190         struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
 191         struct inode            *plh_inode;
 192 };
 193
 194 struct pnfs_device {
 195         struct nfs4_deviceid dev_id;
 196         unsigned int  layout_type;
 197         unsigned int  mincount;
 198         unsigned int  maxcount; /* gdia_maxcount */
 199         struct page **pages;
 200         unsigned int  pgbase;
 201         unsigned int  pglen;    /* reply buffer length */
 202 };
 203
 204 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 205
 206 struct pnfs_devicelist {
 207         unsigned int            eof;
 208         unsigned int            num_devs;
 209         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 210 };
 211
 212 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 213 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 214
 215 /* nfs4proc.c */
 216 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 217                                    struct pnfs_device *dev,
 218                                    struct rpc_cred *cred);
 219 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
 220 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
 221
 222 /* pnfs.c */
 223 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 224 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 225 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
 226
 227 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
 228 void unset_pnfs_layoutdriver(struct nfs_server *);
 229 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 230 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 231 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 232                                 struct nfs_page *req, u64 wb_size);
 233 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 234 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 235                             struct nfs_page *prev, struct nfs_page *req);
 236 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 237 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 238 void pnfs_free_lseg_list(struct list_head *tmp_list);
 239 void pnfs_destroy_layout(struct nfs_inode *);
 240 void pnfs_destroy_all_layouts(struct nfs_client *);
 241 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 242                 struct nfs_fsid *fsid,
 243                 bool is_recall);
 244 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 245                 bool is_recall);
 246 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 247 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 248                              const nfs4_stateid *new,
 249                              bool update_barrier);
 250 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
 251                                   struct pnfs_layout_hdr *lo,
 252                                   struct pnfs_layout_range *range,
 253                                   struct nfs4_state *open_state);
 254 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 255                                 struct list_head *tmp_list,
 256                                 struct pnfs_layout_range *recall_range);
 257 bool pnfs_roc(struct inode *ino);
 258 void pnfs_roc_release(struct inode *ino);
 259 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
 260 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
 261 void pnfs_set_layoutcommit(struct nfs_pgio_header *);
 262 void pnfs_commit_set_layoutcommit(struct nfs_commit_data *data);
 263 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 264 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 265 int _pnfs_return_layout(struct inode *);
 266 int pnfs_commit_and_return_layout(struct inode *);
 267 void pnfs_ld_write_done(struct nfs_pgio_header *);
 268 void pnfs_ld_read_done(struct nfs_pgio_header *);
 269 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 270                                                struct nfs_open_context *ctx,
 271                                                loff_t pos,
 272                                                u64 count,
 273                                                enum pnfs_iomode iomode,
 274                                                gfp_t gfp_flags);
 275
 276 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 277 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 278 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 279 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 280 void pnfs_error_mark_layout_for_return(struct inode *inode,
 281                                        struct pnfs_layout_segment *lseg);
 282
 283 /* nfs4_deviceid_flags */
 284 enum {
 285         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 286         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 287 };
 288
 289 /* pnfs_dev.c */
 290 struct nfs4_deviceid_node {
 291         struct hlist_node               node;
 292         struct hlist_node               tmpnode;
 293         const struct pnfs_layoutdriver_type *ld;
 294         const struct nfs_client         *nfs_client;
 295         unsigned long                   flags;
 296         unsigned long                   timestamp_unavailable;
 297         struct nfs4_deviceid            deviceid;
 298         atomic_t                        ref;
 299 };
 300
 301 struct nfs4_deviceid_node *
 302 nfs4_find_get_deviceid(struct nfs_server *server,
 303                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
 304                 gfp_t gfp_mask);
 305 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 306 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 307                              const struct nfs4_deviceid *);
 308 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 309 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 310 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 311 void nfs4_deviceid_purge_client(const struct nfs_client *);
 312
 313 /* pnfs_nfs.c */
 314 void pnfs_generic_clear_request_commit(struct nfs_page *req,
 315                                        struct nfs_commit_info *cinfo);
 316 void pnfs_generic_commit_release(void *calldata);
 317 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
 318 void pnfs_generic_rw_release(void *data);
 319 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
 320                                       struct nfs_commit_info *cinfo);
 321 int pnfs_generic_commit_pagelist(struct inode *inode,
 322                                  struct list_head *mds_pages,
 323                                  int how,
 324                                  struct nfs_commit_info *cinfo,
 325                                  int (*initiate_commit)(struct nfs_commit_data *data,
 326                                                         int how));
 327 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
 328 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
 329 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
 330 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
 331                                       gfp_t gfp_flags);
 332 void nfs4_pnfs_v3_ds_connect_unload(void);
 333 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
 334                           struct nfs4_deviceid_node *devid, unsigned int timeo,
 335                           unsigned int retrans, u32 version, u32 minor_version,
 336                           rpc_authflavor_t au_flavor);
 337 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 338                                                  struct xdr_stream *xdr,
 339                                                  gfp_t gfp_flags);
 340
 341 static inline struct nfs4_deviceid_node *
 342 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 343 {
 344         atomic_inc(&d->ref);
 345         return d;
 346 }
 347
 348 static inline struct pnfs_layout_segment *
 349 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 350 {
 351         if (lseg) {
 352                 atomic_inc(&lseg->pls_refcount);
 353                 smp_mb__after_atomic();
 354         }
 355         return lseg;
 356 }
 357
 358 /* Return true if a layout driver is being used for this mountpoint */
 359 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 360 {
 361         return nfss->pnfs_curr_ld != NULL;
 362 }
 363
 364 static inline int
 365 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 366                  struct nfs_commit_info *cinfo)
 367 {
 368         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 369                 return PNFS_NOT_ATTEMPTED;
 370         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 371 }
 372
 373 static inline struct pnfs_ds_commit_info *
 374 pnfs_get_ds_info(struct inode *inode)
 375 {
 376         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 377
 378         if (ld == NULL || ld->get_ds_info == NULL)
 379                 return NULL;
 380         return ld->get_ds_info(inode);
 381 }
 382
 383 static inline void
 384 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
 385 {
 386         set_bit(NFS_DEVICEID_INVALID, &node->flags);
 387 }
 388
 389 static inline bool
 390 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 391                          struct nfs_commit_info *cinfo)
 392 {
 393         struct inode *inode = req->wb_context->dentry->d_inode;
 394         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 395
 396         if (lseg == NULL || ld->mark_request_commit == NULL)
 397                 return false;
 398         ld->mark_request_commit(req, lseg, cinfo);
 399         return true;
 400 }
 401
 402 static inline bool
 403 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 404 {
 405         struct inode *inode = req->wb_context->dentry->d_inode;
 406         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 407
 408         if (ld == NULL || ld->clear_request_commit == NULL)
 409                 return false;
 410         ld->clear_request_commit(req, cinfo);
 411         return true;
 412 }
 413
 414 static inline int
 415 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 416                        int max)
 417 {
 418         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 419                 return 0;
 420         else
 421                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 422 }
 423
 424 static inline struct nfs_page *
 425 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 426                         struct page *page)
 427 {
 428         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 429
 430         if (ld == NULL || ld->search_commit_reqs == NULL)
 431                 return NULL;
 432         return ld->search_commit_reqs(cinfo, page);
 433 }
 434
 435 /* Should the pNFS client commit and return the layout upon a setattr */
 436 static inline bool
 437 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 438 {
 439         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 440                 return false;
 441         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 442                 PNFS_LAYOUTRET_ON_SETATTR;
 443 }
 444
 445 static inline bool
 446 pnfs_ld_read_whole_page(struct inode *inode)
 447 {
 448         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 449                 return false;
 450         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
 451 }
 452
 453 static inline bool
 454 pnfs_layoutcommit_outstanding(struct inode *inode)
 455 {
 456         struct nfs_inode *nfsi = NFS_I(inode);
 457
 458         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
 459                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
 460 }
 461
 462 static inline int pnfs_return_layout(struct inode *ino)
 463 {
 464         struct nfs_inode *nfsi = NFS_I(ino);
 465         struct nfs_server *nfss = NFS_SERVER(ino);
 466
 467         if (pnfs_enabled_sb(nfss) && nfsi->layout)
 468                 return _pnfs_return_layout(ino);
 469
 470         return 0;
 471 }
 472
 473 static inline bool
 474 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 475                    struct nfs_server *nfss)
 476 {
 477         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 478                                         nfss->pnfs_curr_ld->id == src->l_type);
 479 }
 480
 481 #ifdef NFS_DEBUG
 482 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 483 #else
 484 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 485 {
 486 }
 487 #endif /* NFS_DEBUG */
 488 #else  /* CONFIG_NFS_V4_1 */
 489
 490 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 491 {
 492 }
 493
 494 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 495 {
 496 }
 497
 498 static inline struct pnfs_layout_segment *
 499 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 500 {
 501         return NULL;
 502 }
 503
 504 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 505 {
 506 }
 507
 508 static inline int pnfs_return_layout(struct inode *ino)
 509 {
 510         return 0;
 511 }
 512
 513 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 514 {
 515         return 0;
 516 }
 517
 518 static inline bool
 519 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 520 {
 521         return false;
 522 }
 523
 524 static inline bool
 525 pnfs_ld_read_whole_page(struct inode *inode)
 526 {
 527         return false;
 528 }
 529
 530 static inline bool
 531 pnfs_roc(struct inode *ino)
 532 {
 533         return false;
 534 }
 535
 536 static inline void
 537 pnfs_roc_release(struct inode *ino)
 538 {
 539 }
 540
 541 static inline void
 542 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 543 {
 544 }
 545
 546 static inline bool
 547 pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
 548 {
 549         return false;
 550 }
 551
 552 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 553                                          const struct nfs_fh *mntfh, u32 id)
 554 {
 555 }
 556
 557 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 558 {
 559 }
 560
 561 static inline int
 562 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 563                  struct nfs_commit_info *cinfo)
 564 {
 565         return PNFS_NOT_ATTEMPTED;
 566 }
 567
 568 static inline struct pnfs_ds_commit_info *
 569 pnfs_get_ds_info(struct inode *inode)
 570 {
 571         return NULL;
 572 }
 573
 574 static inline bool
 575 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 576                          struct nfs_commit_info *cinfo)
 577 {
 578         return false;
 579 }
 580
 581 static inline bool
 582 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 583 {
 584         return false;
 585 }
 586
 587 static inline int
 588 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 589                        int max)
 590 {
 591         return 0;
 592 }
 593
 594 static inline struct nfs_page *
 595 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 596                         struct page *page)
 597 {
 598         return NULL;
 599 }
 600
 601 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 602 {
 603         return 0;
 604 }
 605
 606 static inline bool
 607 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 608                    struct nfs_server *nfss)
 609 {
 610         return false;
 611 }
 612
 613 static inline bool
 614 pnfs_layoutcommit_outstanding(struct inode *inode)
 615 {
 616         return false;
 617 }
 618
 619
 620 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 621 {
 622         return NULL;
 623 }
 624
 625 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 626 {
 627 }
 628
 629 #endif /* CONFIG_NFS_V4_1 */
 630
 631 #endif /* FS_NFS_PNFS_H */