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         int (*sync)(struct inode *inode, bool datasync);
 159
 160         /*
 161          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 162          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 163          */
 164         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 165         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 166
 167         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 168         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 169                         (struct nfs_server *server, struct pnfs_device *pdev,
 170                         gfp_t gfp_flags);
 171
 172         void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
 173                                      struct xdr_stream *xdr,
 174                                      const struct nfs4_layoutreturn_args *args);
 175
 176         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 177         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
 178         void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
 179                                      struct xdr_stream *xdr,
 180                                      const struct nfs4_layoutcommit_args *args);
 181         int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
 182         void (*cleanup_layoutstats) (struct nfs42_layoutstat_data *data);
 183 };
 184
 185 struct pnfs_layout_hdr {
 186         atomic_t                plh_refcount;
 187         struct list_head        plh_layouts;   /* other client layouts */
 188         struct list_head        plh_bulk_destroy;
 189         struct list_head        plh_segs;      /* layout segments list */
 190         nfs4_stateid            plh_stateid;
 191         atomic_t                plh_outstanding; /* number of RPCs out */
 192         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 193         u32                     plh_barrier; /* ignore lower seqids */
 194         unsigned long           plh_retry_timestamp;
 195         unsigned long           plh_flags;
 196         enum pnfs_iomode        plh_return_iomode;
 197         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 198         struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
 199         struct inode            *plh_inode;
 200 };
 201
 202 struct pnfs_device {
 203         struct nfs4_deviceid dev_id;
 204         unsigned int  layout_type;
 205         unsigned int  mincount;
 206         unsigned int  maxcount; /* gdia_maxcount */
 207         struct page **pages;
 208         unsigned int  pgbase;
 209         unsigned int  pglen;    /* reply buffer length */
 210         unsigned char nocache : 1;/* May not be cached */
 211 };
 212
 213 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 214
 215 struct pnfs_devicelist {
 216         unsigned int            eof;
 217         unsigned int            num_devs;
 218         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 219 };
 220
 221 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 222 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 223
 224 /* nfs4proc.c */
 225 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 226                                    struct pnfs_device *dev,
 227                                    struct rpc_cred *cred);
 228 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
 229 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
 230
 231 /* pnfs.c */
 232 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 233 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 234 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
 235
 236 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
 237 void unset_pnfs_layoutdriver(struct nfs_server *);
 238 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 239 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 240 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 241                                 struct nfs_page *req, u64 wb_size);
 242 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
 243 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 244 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 245                             struct nfs_page *prev, struct nfs_page *req);
 246 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 247 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 248 void pnfs_free_lseg_list(struct list_head *tmp_list);
 249 void pnfs_destroy_layout(struct nfs_inode *);
 250 void pnfs_destroy_all_layouts(struct nfs_client *);
 251 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 252                 struct nfs_fsid *fsid,
 253                 bool is_recall);
 254 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 255                 bool is_recall);
 256 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 257 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 258                              const nfs4_stateid *new,
 259                              bool update_barrier);
 260 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
 261                                   struct pnfs_layout_hdr *lo,
 262                                   struct pnfs_layout_range *range,
 263                                   struct nfs4_state *open_state);
 264 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 265                                 struct list_head *tmp_list,
 266                                 struct pnfs_layout_range *recall_range);
 267 bool pnfs_roc(struct inode *ino);
 268 void pnfs_roc_release(struct inode *ino);
 269 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
 270 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
 271 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
 272 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 273 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 274 int pnfs_generic_sync(struct inode *inode, bool datasync);
 275 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
 276 int _pnfs_return_layout(struct inode *);
 277 int pnfs_commit_and_return_layout(struct inode *);
 278 void pnfs_ld_write_done(struct nfs_pgio_header *);
 279 void pnfs_ld_read_done(struct nfs_pgio_header *);
 280 int pnfs_read_resend_pnfs(struct nfs_pgio_header *);
 281 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 282                                                struct nfs_open_context *ctx,
 283                                                loff_t pos,
 284                                                u64 count,
 285                                                enum pnfs_iomode iomode,
 286                                                gfp_t gfp_flags);
 287 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo);
 288
 289 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 290 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 291 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 292 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 293 void pnfs_error_mark_layout_for_return(struct inode *inode,
 294                                        struct pnfs_layout_segment *lseg);
 295 /* nfs4_deviceid_flags */
 296 enum {
 297         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 298         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 299         NFS_DEVICEID_NOCACHE,           /* device may not be cached */
 300 };
 301
 302 /* pnfs_dev.c */
 303 struct nfs4_deviceid_node {
 304         struct hlist_node               node;
 305         struct hlist_node               tmpnode;
 306         const struct pnfs_layoutdriver_type *ld;
 307         const struct nfs_client         *nfs_client;
 308         unsigned long                   flags;
 309         unsigned long                   timestamp_unavailable;
 310         struct nfs4_deviceid            deviceid;
 311         struct rcu_head                 rcu;
 312         atomic_t                        ref;
 313 };
 314
 315 struct nfs4_deviceid_node *
 316 nfs4_find_get_deviceid(struct nfs_server *server,
 317                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
 318                 gfp_t gfp_mask);
 319 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 320 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 321                              const struct nfs4_deviceid *);
 322 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 323 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 324 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 325 void nfs4_deviceid_purge_client(const struct nfs_client *);
 326
 327 /* pnfs_nfs.c */
 328 void pnfs_generic_clear_request_commit(struct nfs_page *req,
 329                                        struct nfs_commit_info *cinfo);
 330 void pnfs_generic_commit_release(void *calldata);
 331 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
 332 void pnfs_generic_rw_release(void *data);
 333 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
 334                                       struct nfs_commit_info *cinfo);
 335 int pnfs_generic_commit_pagelist(struct inode *inode,
 336                                  struct list_head *mds_pages,
 337                                  int how,
 338                                  struct nfs_commit_info *cinfo,
 339                                  int (*initiate_commit)(struct nfs_commit_data *data,
 340                                                         int how));
 341 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
 342 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
 343 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
 344 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
 345                                       gfp_t gfp_flags);
 346 void nfs4_pnfs_v3_ds_connect_unload(void);
 347 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
 348                           struct nfs4_deviceid_node *devid, unsigned int timeo,
 349                           unsigned int retrans, u32 version, u32 minor_version,
 350                           rpc_authflavor_t au_flavor);
 351 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 352                                                  struct xdr_stream *xdr,
 353                                                  gfp_t gfp_flags);
 354 void pnfs_layout_mark_request_commit(struct nfs_page *req,
 355                                      struct pnfs_layout_segment *lseg,
 356                                      struct nfs_commit_info *cinfo,
 357                                      u32 ds_commit_idx);
 358
 359 static inline bool nfs_have_layout(struct inode *inode)
 360 {
 361         return NFS_I(inode)->layout != NULL;
 362 }
 363
 364 static inline struct nfs4_deviceid_node *
 365 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 366 {
 367         atomic_inc(&d->ref);
 368         return d;
 369 }
 370
 371 static inline void pnfs_set_retry_layoutget(struct pnfs_layout_hdr *lo)
 372 {
 373         if (!test_and_set_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags))
 374                 atomic_inc(&lo->plh_refcount);
 375 }
 376
 377 static inline void pnfs_clear_retry_layoutget(struct pnfs_layout_hdr *lo)
 378 {
 379         if (test_and_clear_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags)) {
 380                 atomic_dec(&lo->plh_refcount);
 381                 /* wake up waiters for LAYOUTRETURN as that is not needed */
 382                 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
 383         }
 384 }
 385
 386 static inline bool pnfs_should_retry_layoutget(struct pnfs_layout_hdr *lo)
 387 {
 388         return test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags);
 389 }
 390
 391 static inline struct pnfs_layout_segment *
 392 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 393 {
 394         if (lseg) {
 395                 atomic_inc(&lseg->pls_refcount);
 396                 smp_mb__after_atomic();
 397         }
 398         return lseg;
 399 }
 400
 401 /* Return true if a layout driver is being used for this mountpoint */
 402 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 403 {
 404         return nfss->pnfs_curr_ld != NULL;
 405 }
 406
 407 static inline int
 408 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 409                  struct nfs_commit_info *cinfo)
 410 {
 411         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 412                 return PNFS_NOT_ATTEMPTED;
 413         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 414 }
 415
 416 static inline struct pnfs_ds_commit_info *
 417 pnfs_get_ds_info(struct inode *inode)
 418 {
 419         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 420
 421         if (ld == NULL || ld->get_ds_info == NULL)
 422                 return NULL;
 423         return ld->get_ds_info(inode);
 424 }
 425
 426 static inline void
 427 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
 428 {
 429         set_bit(NFS_DEVICEID_INVALID, &node->flags);
 430 }
 431
 432 static inline bool
 433 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 434                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 435 {
 436         struct inode *inode = d_inode(req->wb_context->dentry);
 437         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 438
 439         if (lseg == NULL || ld->mark_request_commit == NULL)
 440                 return false;
 441         ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
 442         return true;
 443 }
 444
 445 static inline bool
 446 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 447 {
 448         struct inode *inode = d_inode(req->wb_context->dentry);
 449         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 450
 451         if (ld == NULL || ld->clear_request_commit == NULL)
 452                 return false;
 453         ld->clear_request_commit(req, cinfo);
 454         return true;
 455 }
 456
 457 static inline int
 458 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 459                        int max)
 460 {
 461         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 462                 return 0;
 463         else
 464                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 465 }
 466
 467 static inline struct nfs_page *
 468 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 469                         struct page *page)
 470 {
 471         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 472
 473         if (ld == NULL || ld->search_commit_reqs == NULL)
 474                 return NULL;
 475         return ld->search_commit_reqs(cinfo, page);
 476 }
 477
 478 /* Should the pNFS client commit and return the layout upon a setattr */
 479 static inline bool
 480 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 481 {
 482         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 483                 return false;
 484         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 485                 PNFS_LAYOUTRET_ON_SETATTR;
 486 }
 487
 488 static inline bool
 489 pnfs_ld_read_whole_page(struct inode *inode)
 490 {
 491         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 492                 return false;
 493         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
 494 }
 495
 496 static inline int
 497 pnfs_sync_inode(struct inode *inode, bool datasync)
 498 {
 499         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 500                 return 0;
 501         return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
 502 }
 503
 504 static inline bool
 505 pnfs_layoutcommit_outstanding(struct inode *inode)
 506 {
 507         struct nfs_inode *nfsi = NFS_I(inode);
 508
 509         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
 510                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
 511 }
 512
 513 static inline int pnfs_return_layout(struct inode *ino)
 514 {
 515         struct nfs_inode *nfsi = NFS_I(ino);
 516         struct nfs_server *nfss = NFS_SERVER(ino);
 517
 518         if (pnfs_enabled_sb(nfss) && nfsi->layout)
 519                 return _pnfs_return_layout(ino);
 520
 521         return 0;
 522 }
 523
 524 static inline bool
 525 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 526                    struct nfs_server *nfss)
 527 {
 528         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 529                                         nfss->pnfs_curr_ld->id == src->l_type);
 530 }
 531
 532 #ifdef NFS_DEBUG
 533 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 534 #else
 535 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 536 {
 537 }
 538 #endif /* NFS_DEBUG */
 539 #else  /* CONFIG_NFS_V4_1 */
 540
 541 static inline bool nfs_have_layout(struct inode *inode)
 542 {
 543         return false;
 544 }
 545
 546 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 547 {
 548 }
 549
 550 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 551 {
 552 }
 553
 554 static inline struct pnfs_layout_segment *
 555 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 556 {
 557         return NULL;
 558 }
 559
 560 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 561 {
 562 }
 563
 564 static inline int pnfs_return_layout(struct inode *ino)
 565 {
 566         return 0;
 567 }
 568
 569 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 570 {
 571         return 0;
 572 }
 573
 574 static inline bool
 575 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 576 {
 577         return false;
 578 }
 579
 580 static inline bool
 581 pnfs_ld_read_whole_page(struct inode *inode)
 582 {
 583         return false;
 584 }
 585
 586 static inline int
 587 pnfs_sync_inode(struct inode *inode, bool datasync)
 588 {
 589         return 0;
 590 }
 591
 592 static inline bool
 593 pnfs_roc(struct inode *ino)
 594 {
 595         return false;
 596 }
 597
 598 static inline void
 599 pnfs_roc_release(struct inode *ino)
 600 {
 601 }
 602
 603 static inline void
 604 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 605 {
 606 }
 607
 608 static inline bool
 609 pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
 610 {
 611         return false;
 612 }
 613
 614 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 615                                          const struct nfs_fh *mntfh, u32 id)
 616 {
 617 }
 618
 619 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 620 {
 621 }
 622
 623 static inline int
 624 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 625                  struct nfs_commit_info *cinfo)
 626 {
 627         return PNFS_NOT_ATTEMPTED;
 628 }
 629
 630 static inline struct pnfs_ds_commit_info *
 631 pnfs_get_ds_info(struct inode *inode)
 632 {
 633         return NULL;
 634 }
 635
 636 static inline bool
 637 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 638                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 639 {
 640         return false;
 641 }
 642
 643 static inline bool
 644 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 645 {
 646         return false;
 647 }
 648
 649 static inline int
 650 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 651                        int max)
 652 {
 653         return 0;
 654 }
 655
 656 static inline struct nfs_page *
 657 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 658                         struct page *page)
 659 {
 660         return NULL;
 661 }
 662
 663 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 664 {
 665         return 0;
 666 }
 667
 668 static inline bool
 669 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 670                    struct nfs_server *nfss)
 671 {
 672         return false;
 673 }
 674
 675 static inline bool
 676 pnfs_layoutcommit_outstanding(struct inode *inode)
 677 {
 678         return false;
 679 }
 680
 681
 682 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 683 {
 684         return NULL;
 685 }
 686
 687 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 688 {
 689 }
 690
 691 #endif /* CONFIG_NFS_V4_1 */
 692
 693 #if IS_ENABLED(CONFIG_NFS_V4_2)
 694 int pnfs_report_layoutstat(struct inode *inode);
 695 #else
 696 static inline int
 697 pnfs_report_layoutstat(struct inode *inode)
 698 {
 699         return 0;
 700 }
 701 #endif
 702
 703 #endif /* FS_NFS_PNFS_H */