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         PNFS_TRY_AGAIN     = 2,
  76 };
  77
  78 #ifdef CONFIG_NFS_V4_1
  79
  80 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
  81
  82 /*
  83  * Default data server connection timeout and retrans vaules.
  84  * Set by module parameters dataserver_timeo and dataserver_retrans.
  85  */
  86 #define NFS4_DEF_DS_TIMEO   600 /* in tenths of a second */
  87 #define NFS4_DEF_DS_RETRANS 5
  88
  89 /* error codes for internal use */
  90 #define NFS4ERR_RESET_TO_MDS   12001
  91 #define NFS4ERR_RESET_TO_PNFS  12002
  92
  93 enum {
  94         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
  95         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
  96         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
  97         NFS_LAYOUT_ROC,                 /* some lseg had roc bit set */
  98         NFS_LAYOUT_RETURN,              /* Return this layout ASAP */
  99         NFS_LAYOUT_RETURN_BEFORE_CLOSE, /* Return this layout before close */
 100         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
 101         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first layoutget */
 102         NFS_LAYOUT_RETRY_LAYOUTGET,     /* Retry layoutget */
 103 };
 104
 105 enum layoutdriver_policy_flags {
 106         /* Should the pNFS client commit and return the layout upon truncate to
 107          * a smaller size */
 108         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
 109         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
 110         PNFS_READ_WHOLE_PAGE            = 1 << 2,
 111 };
 112
 113 struct nfs4_deviceid_node;
 114
 115 /* Per-layout driver specific registration structure */
 116 struct pnfs_layoutdriver_type {
 117         struct list_head pnfs_tblid;
 118         const u32 id;
 119         const char *name;
 120         struct module *owner;
 121         unsigned flags;
 122         unsigned max_deviceinfo_size;
 123
 124         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
 125         int (*clear_layoutdriver) (struct nfs_server *);
 126
 127         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
 128         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
 129
 130         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
 131         void (*free_lseg) (struct pnfs_layout_segment *lseg);
 132
 133         void (*return_range) (struct pnfs_layout_hdr *lo,
 134                               struct pnfs_layout_range *range);
 135
 136         /* test for nfs page cache coalescing */
 137         const struct nfs_pageio_ops *pg_read_ops;
 138         const struct nfs_pageio_ops *pg_write_ops;
 139
 140         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
 141         void (*mark_request_commit) (struct nfs_page *req,
 142                                      struct pnfs_layout_segment *lseg,
 143                                      struct nfs_commit_info *cinfo,
 144                                      u32 ds_commit_idx);
 145         void (*clear_request_commit) (struct nfs_page *req,
 146                                       struct nfs_commit_info *cinfo);
 147         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 148                                   int max);
 149         void (*recover_commit_reqs) (struct list_head *list,
 150                                      struct nfs_commit_info *cinfo);
 151         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
 152                                                 struct page *page);
 153         int (*commit_pagelist)(struct inode *inode,
 154                                struct list_head *mds_pages,
 155                                int how,
 156                                struct nfs_commit_info *cinfo);
 157
 158         /*
 159          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 160          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 161          */
 162         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 163         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 164
 165         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 166         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 167                         (struct nfs_server *server, struct pnfs_device *pdev,
 168                         gfp_t gfp_flags);
 169
 170         void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
 171                                      struct xdr_stream *xdr,
 172                                      const struct nfs4_layoutreturn_args *args);
 173
 174         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 175         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
 176         void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
 177                                      struct xdr_stream *xdr,
 178                                      const struct nfs4_layoutcommit_args *args);
 179 };
 180
 181 struct pnfs_layout_hdr {
 182         atomic_t                plh_refcount;
 183         struct list_head        plh_layouts;   /* other client layouts */
 184         struct list_head        plh_bulk_destroy;
 185         struct list_head        plh_segs;      /* layout segments list */
 186         nfs4_stateid            plh_stateid;
 187         atomic_t                plh_outstanding; /* number of RPCs out */
 188         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 189         u32                     plh_barrier; /* ignore lower seqids */
 190         unsigned long           plh_retry_timestamp;
 191         unsigned long           plh_flags;
 192         enum pnfs_iomode        plh_return_iomode;
 193         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 194         struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
 195         struct inode            *plh_inode;
 196 };
 197
 198 struct pnfs_device {
 199         struct nfs4_deviceid dev_id;
 200         unsigned int  layout_type;
 201         unsigned int  mincount;
 202         unsigned int  maxcount; /* gdia_maxcount */
 203         struct page **pages;
 204         unsigned int  pgbase;
 205         unsigned int  pglen;    /* reply buffer length */
 206 };
 207
 208 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 209
 210 struct pnfs_devicelist {
 211         unsigned int            eof;
 212         unsigned int            num_devs;
 213         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 214 };
 215
 216 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 217 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 218
 219 /* nfs4proc.c */
 220 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 221                                    struct pnfs_device *dev,
 222                                    struct rpc_cred *cred);
 223 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
 224 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
 225
 226 /* pnfs.c */
 227 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 228 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 229 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
 230
 231 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
 232 void unset_pnfs_layoutdriver(struct nfs_server *);
 233 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 234 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 235 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 236                                 struct nfs_page *req, u64 wb_size);
 237 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
 238 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 239 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 240                             struct nfs_page *prev, struct nfs_page *req);
 241 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 242 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 243 void pnfs_free_lseg_list(struct list_head *tmp_list);
 244 void pnfs_destroy_layout(struct nfs_inode *);
 245 void pnfs_destroy_all_layouts(struct nfs_client *);
 246 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 247                 struct nfs_fsid *fsid,
 248                 bool is_recall);
 249 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 250                 bool is_recall);
 251 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 252 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 253                              const nfs4_stateid *new,
 254                              bool update_barrier);
 255 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
 256                                   struct pnfs_layout_hdr *lo,
 257                                   struct pnfs_layout_range *range,
 258                                   struct nfs4_state *open_state);
 259 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 260                                 struct list_head *tmp_list,
 261                                 struct pnfs_layout_range *recall_range);
 262 bool pnfs_roc(struct inode *ino);
 263 void pnfs_roc_release(struct inode *ino);
 264 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
 265 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
 266 void pnfs_set_layoutcommit(struct nfs_pgio_header *);
 267 void pnfs_commit_set_layoutcommit(struct nfs_commit_data *data);
 268 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 269 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 270 int _pnfs_return_layout(struct inode *);
 271 int pnfs_commit_and_return_layout(struct inode *);
 272 void pnfs_ld_write_done(struct nfs_pgio_header *);
 273 void pnfs_ld_read_done(struct nfs_pgio_header *);
 274 int pnfs_read_resend_pnfs(struct nfs_pgio_header *);
 275 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 276                                                struct nfs_open_context *ctx,
 277                                                loff_t pos,
 278                                                u64 count,
 279                                                enum pnfs_iomode iomode,
 280                                                gfp_t gfp_flags);
 281 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo);
 282
 283 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 284 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 285 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 286 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 287 void pnfs_error_mark_layout_for_return(struct inode *inode,
 288                                        struct pnfs_layout_segment *lseg);
 289
 290 /* nfs4_deviceid_flags */
 291 enum {
 292         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 293         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 294 };
 295
 296 /* pnfs_dev.c */
 297 struct nfs4_deviceid_node {
 298         struct hlist_node               node;
 299         struct hlist_node               tmpnode;
 300         const struct pnfs_layoutdriver_type *ld;
 301         const struct nfs_client         *nfs_client;
 302         unsigned long                   flags;
 303         unsigned long                   timestamp_unavailable;
 304         struct nfs4_deviceid            deviceid;
 305         atomic_t                        ref;
 306 };
 307
 308 struct nfs4_deviceid_node *
 309 nfs4_find_get_deviceid(struct nfs_server *server,
 310                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
 311                 gfp_t gfp_mask);
 312 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 313 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 314                              const struct nfs4_deviceid *);
 315 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 316 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 317 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 318 void nfs4_deviceid_purge_client(const struct nfs_client *);
 319
 320 /* pnfs_nfs.c */
 321 void pnfs_generic_clear_request_commit(struct nfs_page *req,
 322                                        struct nfs_commit_info *cinfo);
 323 void pnfs_generic_commit_release(void *calldata);
 324 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
 325 void pnfs_generic_rw_release(void *data);
 326 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
 327                                       struct nfs_commit_info *cinfo);
 328 int pnfs_generic_commit_pagelist(struct inode *inode,
 329                                  struct list_head *mds_pages,
 330                                  int how,
 331                                  struct nfs_commit_info *cinfo,
 332                                  int (*initiate_commit)(struct nfs_commit_data *data,
 333                                                         int how));
 334 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
 335 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
 336 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
 337 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
 338                                       gfp_t gfp_flags);
 339 void nfs4_pnfs_v3_ds_connect_unload(void);
 340 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
 341                           struct nfs4_deviceid_node *devid, unsigned int timeo,
 342                           unsigned int retrans, u32 version, u32 minor_version,
 343                           rpc_authflavor_t au_flavor);
 344 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 345                                                  struct xdr_stream *xdr,
 346                                                  gfp_t gfp_flags);
 347
 348 static inline bool nfs_have_layout(struct inode *inode)
 349 {
 350         return NFS_I(inode)->layout != NULL;
 351 }
 352
 353 static inline struct nfs4_deviceid_node *
 354 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 355 {
 356         atomic_inc(&d->ref);
 357         return d;
 358 }
 359
 360 static inline void pnfs_set_retry_layoutget(struct pnfs_layout_hdr *lo)
 361 {
 362         if (!test_and_set_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags))
 363                 atomic_inc(&lo->plh_refcount);
 364 }
 365
 366 static inline void pnfs_clear_retry_layoutget(struct pnfs_layout_hdr *lo)
 367 {
 368         if (test_and_clear_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags)) {
 369                 atomic_dec(&lo->plh_refcount);
 370                 /* wake up waiters for LAYOUTRETURN as that is not needed */
 371                 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
 372         }
 373 }
 374
 375 static inline bool pnfs_should_retry_layoutget(struct pnfs_layout_hdr *lo)
 376 {
 377         return test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags);
 378 }
 379
 380 static inline struct pnfs_layout_segment *
 381 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 382 {
 383         if (lseg) {
 384                 atomic_inc(&lseg->pls_refcount);
 385                 smp_mb__after_atomic();
 386         }
 387         return lseg;
 388 }
 389
 390 /* Return true if a layout driver is being used for this mountpoint */
 391 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 392 {
 393         return nfss->pnfs_curr_ld != NULL;
 394 }
 395
 396 static inline int
 397 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 398                  struct nfs_commit_info *cinfo)
 399 {
 400         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 401                 return PNFS_NOT_ATTEMPTED;
 402         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 403 }
 404
 405 static inline struct pnfs_ds_commit_info *
 406 pnfs_get_ds_info(struct inode *inode)
 407 {
 408         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 409
 410         if (ld == NULL || ld->get_ds_info == NULL)
 411                 return NULL;
 412         return ld->get_ds_info(inode);
 413 }
 414
 415 static inline void
 416 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
 417 {
 418         set_bit(NFS_DEVICEID_INVALID, &node->flags);
 419 }
 420
 421 static inline bool
 422 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 423                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 424 {
 425         struct inode *inode = req->wb_context->dentry->d_inode;
 426         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 427
 428         if (lseg == NULL || ld->mark_request_commit == NULL)
 429                 return false;
 430         ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
 431         return true;
 432 }
 433
 434 static inline bool
 435 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 436 {
 437         struct inode *inode = req->wb_context->dentry->d_inode;
 438         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 439
 440         if (ld == NULL || ld->clear_request_commit == NULL)
 441                 return false;
 442         ld->clear_request_commit(req, cinfo);
 443         return true;
 444 }
 445
 446 static inline int
 447 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 448                        int max)
 449 {
 450         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 451                 return 0;
 452         else
 453                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 454 }
 455
 456 static inline struct nfs_page *
 457 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 458                         struct page *page)
 459 {
 460         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 461
 462         if (ld == NULL || ld->search_commit_reqs == NULL)
 463                 return NULL;
 464         return ld->search_commit_reqs(cinfo, page);
 465 }
 466
 467 /* Should the pNFS client commit and return the layout upon a setattr */
 468 static inline bool
 469 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 470 {
 471         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 472                 return false;
 473         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 474                 PNFS_LAYOUTRET_ON_SETATTR;
 475 }
 476
 477 static inline bool
 478 pnfs_ld_read_whole_page(struct inode *inode)
 479 {
 480         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 481                 return false;
 482         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
 483 }
 484
 485 static inline bool
 486 pnfs_layoutcommit_outstanding(struct inode *inode)
 487 {
 488         struct nfs_inode *nfsi = NFS_I(inode);
 489
 490         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
 491                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
 492 }
 493
 494 static inline int pnfs_return_layout(struct inode *ino)
 495 {
 496         struct nfs_inode *nfsi = NFS_I(ino);
 497         struct nfs_server *nfss = NFS_SERVER(ino);
 498
 499         if (pnfs_enabled_sb(nfss) && nfsi->layout)
 500                 return _pnfs_return_layout(ino);
 501
 502         return 0;
 503 }
 504
 505 static inline bool
 506 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 507                    struct nfs_server *nfss)
 508 {
 509         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 510                                         nfss->pnfs_curr_ld->id == src->l_type);
 511 }
 512
 513 #ifdef NFS_DEBUG
 514 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 515 #else
 516 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 517 {
 518 }
 519 #endif /* NFS_DEBUG */
 520 #else  /* CONFIG_NFS_V4_1 */
 521
 522 static inline bool nfs_have_layout(struct inode *inode)
 523 {
 524         return false;
 525 }
 526
 527 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 528 {
 529 }
 530
 531 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 532 {
 533 }
 534
 535 static inline struct pnfs_layout_segment *
 536 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 537 {
 538         return NULL;
 539 }
 540
 541 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 542 {
 543 }
 544
 545 static inline int pnfs_return_layout(struct inode *ino)
 546 {
 547         return 0;
 548 }
 549
 550 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 551 {
 552         return 0;
 553 }
 554
 555 static inline bool
 556 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 557 {
 558         return false;
 559 }
 560
 561 static inline bool
 562 pnfs_ld_read_whole_page(struct inode *inode)
 563 {
 564         return false;
 565 }
 566
 567 static inline bool
 568 pnfs_roc(struct inode *ino)
 569 {
 570         return false;
 571 }
 572
 573 static inline void
 574 pnfs_roc_release(struct inode *ino)
 575 {
 576 }
 577
 578 static inline void
 579 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 580 {
 581 }
 582
 583 static inline bool
 584 pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
 585 {
 586         return false;
 587 }
 588
 589 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 590                                          const struct nfs_fh *mntfh, u32 id)
 591 {
 592 }
 593
 594 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 595 {
 596 }
 597
 598 static inline int
 599 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 600                  struct nfs_commit_info *cinfo)
 601 {
 602         return PNFS_NOT_ATTEMPTED;
 603 }
 604
 605 static inline struct pnfs_ds_commit_info *
 606 pnfs_get_ds_info(struct inode *inode)
 607 {
 608         return NULL;
 609 }
 610
 611 static inline bool
 612 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 613                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 614 {
 615         return false;
 616 }
 617
 618 static inline bool
 619 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 620 {
 621         return false;
 622 }
 623
 624 static inline int
 625 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 626                        int max)
 627 {
 628         return 0;
 629 }
 630
 631 static inline struct nfs_page *
 632 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 633                         struct page *page)
 634 {
 635         return NULL;
 636 }
 637
 638 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 639 {
 640         return 0;
 641 }
 642
 643 static inline bool
 644 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 645                    struct nfs_server *nfss)
 646 {
 647         return false;
 648 }
 649
 650 static inline bool
 651 pnfs_layoutcommit_outstanding(struct inode *inode)
 652 {
 653         return false;
 654 }
 655
 656
 657 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 658 {
 659         return NULL;
 660 }
 661
 662 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 663 {
 664 }
 665
 666 #endif /* CONFIG_NFS_V4_1 */
 667
 668 #endif /* FS_NFS_PNFS_H */