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_RETURN,              /* Return this layout ASAP */
  98         NFS_LAYOUT_RETURN_BEFORE_CLOSE, /* Return this layout before close */
  99         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
 100         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first layoutget */
 101         NFS_LAYOUT_RETRY_LAYOUTGET,     /* Retry layoutget */
 102 };
 103
 104 enum layoutdriver_policy_flags {
 105         /* Should the pNFS client commit and return the layout upon truncate to
 106          * a smaller size */
 107         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
 108         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
 109         PNFS_READ_WHOLE_PAGE            = 1 << 2,
 110 };
 111
 112 struct nfs4_deviceid_node;
 113
 114 /* Per-layout driver specific registration structure */
 115 struct pnfs_layoutdriver_type {
 116         struct list_head pnfs_tblid;
 117         const u32 id;
 118         const char *name;
 119         struct module *owner;
 120         unsigned flags;
 121         unsigned max_deviceinfo_size;
 122
 123         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
 124         int (*clear_layoutdriver) (struct nfs_server *);
 125
 126         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
 127         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
 128
 129         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
 130         void (*free_lseg) (struct pnfs_layout_segment *lseg);
 131         void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
 132                         struct pnfs_layout_segment *lseg,
 133                         struct list_head *free_me);
 134
 135         void (*return_range) (struct pnfs_layout_hdr *lo,
 136                               struct pnfs_layout_range *range);
 137
 138         /* test for nfs page cache coalescing */
 139         const struct nfs_pageio_ops *pg_read_ops;
 140         const struct nfs_pageio_ops *pg_write_ops;
 141
 142         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
 143         void (*mark_request_commit) (struct nfs_page *req,
 144                                      struct pnfs_layout_segment *lseg,
 145                                      struct nfs_commit_info *cinfo,
 146                                      u32 ds_commit_idx);
 147         void (*clear_request_commit) (struct nfs_page *req,
 148                                       struct nfs_commit_info *cinfo);
 149         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 150                                   int max);
 151         void (*recover_commit_reqs) (struct list_head *list,
 152                                      struct nfs_commit_info *cinfo);
 153         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
 154                                                 struct page *page);
 155         int (*commit_pagelist)(struct inode *inode,
 156                                struct list_head *mds_pages,
 157                                int how,
 158                                struct nfs_commit_info *cinfo);
 159
 160         int (*sync)(struct inode *inode, bool datasync);
 161
 162         /*
 163          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 164          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 165          */
 166         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 167         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 168
 169         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 170         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 171                         (struct nfs_server *server, struct pnfs_device *pdev,
 172                         gfp_t gfp_flags);
 173
 174         void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
 175                                      struct xdr_stream *xdr,
 176                                      const struct nfs4_layoutreturn_args *args);
 177
 178         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 179         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
 180         void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
 181                                      struct xdr_stream *xdr,
 182                                      const struct nfs4_layoutcommit_args *args);
 183         int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
 184         void (*cleanup_layoutstats) (struct nfs42_layoutstat_data *data);
 185 };
 186
 187 struct pnfs_layout_hdr {
 188         atomic_t                plh_refcount;
 189         atomic_t                plh_outstanding; /* number of RPCs out */
 190         struct list_head        plh_layouts;   /* other client layouts */
 191         struct list_head        plh_bulk_destroy;
 192         struct list_head        plh_segs;      /* layout segments list */
 193         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 194         unsigned long           plh_retry_timestamp;
 195         unsigned long           plh_flags;
 196         nfs4_stateid            plh_stateid;
 197         u32                     plh_barrier; /* ignore lower seqids */
 198         enum pnfs_iomode        plh_return_iomode;
 199         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 200         struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
 201         struct inode            *plh_inode;
 202 };
 203
 204 struct pnfs_device {
 205         struct nfs4_deviceid dev_id;
 206         unsigned int  layout_type;
 207         unsigned int  mincount;
 208         unsigned int  maxcount; /* gdia_maxcount */
 209         struct page **pages;
 210         unsigned int  pgbase;
 211         unsigned int  pglen;    /* reply buffer length */
 212         unsigned char nocache : 1;/* May not be cached */
 213 };
 214
 215 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 216
 217 struct pnfs_devicelist {
 218         unsigned int            eof;
 219         unsigned int            num_devs;
 220         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 221 };
 222
 223 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 224 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 225
 226 /* nfs4proc.c */
 227 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 228                                    struct pnfs_device *dev,
 229                                    struct rpc_cred *cred);
 230 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
 231 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
 232
 233 /* pnfs.c */
 234 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 235 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 236 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
 237
 238 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
 239 void unset_pnfs_layoutdriver(struct nfs_server *);
 240 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 241 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 242 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 243                                 struct nfs_page *req, u64 wb_size);
 244 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
 245 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 246 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 247                             struct nfs_page *prev, struct nfs_page *req);
 248 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 249 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 250 void pnfs_free_lseg_list(struct list_head *tmp_list);
 251 void pnfs_destroy_layout(struct nfs_inode *);
 252 void pnfs_destroy_all_layouts(struct nfs_client *);
 253 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 254                 struct nfs_fsid *fsid,
 255                 bool is_recall);
 256 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 257                 bool is_recall);
 258 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 259 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 260                              const nfs4_stateid *new,
 261                              bool update_barrier);
 262 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
 263                                   struct pnfs_layout_hdr *lo,
 264                                   struct pnfs_layout_range *range,
 265                                   struct nfs4_state *open_state);
 266 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 267                                 struct list_head *tmp_list,
 268                                 struct pnfs_layout_range *recall_range);
 269 bool pnfs_roc(struct inode *ino);
 270 void pnfs_roc_release(struct inode *ino);
 271 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
 272 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier);
 273 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
 274 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
 275 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 276 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 277 int pnfs_generic_sync(struct inode *inode, bool datasync);
 278 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
 279 int _pnfs_return_layout(struct inode *);
 280 int pnfs_commit_and_return_layout(struct inode *);
 281 void pnfs_ld_write_done(struct nfs_pgio_header *);
 282 void pnfs_ld_read_done(struct nfs_pgio_header *);
 283 int pnfs_read_resend_pnfs(struct nfs_pgio_header *);
 284 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 285                                                struct nfs_open_context *ctx,
 286                                                loff_t pos,
 287                                                u64 count,
 288                                                enum pnfs_iomode iomode,
 289                                                gfp_t gfp_flags);
 290 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo);
 291
 292 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
 293                    struct pnfs_layout_segment *lseg,
 294                    bool (*is_after)(const struct pnfs_layout_range *lseg_range,
 295                            const struct pnfs_layout_range *old),
 296                    bool (*do_merge)(struct pnfs_layout_segment *lseg,
 297                            struct pnfs_layout_segment *old),
 298                    struct list_head *free_me);
 299
 300 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 301 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 302 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 303 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 304 void pnfs_error_mark_layout_for_return(struct inode *inode,
 305                                        struct pnfs_layout_segment *lseg);
 306 /* nfs4_deviceid_flags */
 307 enum {
 308         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 309         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 310         NFS_DEVICEID_NOCACHE,           /* device may not be cached */
 311 };
 312
 313 /* pnfs_dev.c */
 314 struct nfs4_deviceid_node {
 315         struct hlist_node               node;
 316         struct hlist_node               tmpnode;
 317         const struct pnfs_layoutdriver_type *ld;
 318         const struct nfs_client         *nfs_client;
 319         unsigned long                   flags;
 320         unsigned long                   timestamp_unavailable;
 321         struct nfs4_deviceid            deviceid;
 322         struct rcu_head                 rcu;
 323         atomic_t                        ref;
 324 };
 325
 326 struct nfs4_deviceid_node *
 327 nfs4_find_get_deviceid(struct nfs_server *server,
 328                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
 329                 gfp_t gfp_mask);
 330 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 331 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 332                              const struct nfs4_deviceid *);
 333 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 334 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 335 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 336 void nfs4_deviceid_purge_client(const struct nfs_client *);
 337
 338 /* pnfs_nfs.c */
 339 void pnfs_generic_clear_request_commit(struct nfs_page *req,
 340                                        struct nfs_commit_info *cinfo);
 341 void pnfs_generic_commit_release(void *calldata);
 342 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
 343 void pnfs_generic_rw_release(void *data);
 344 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
 345                                       struct nfs_commit_info *cinfo);
 346 int pnfs_generic_commit_pagelist(struct inode *inode,
 347                                  struct list_head *mds_pages,
 348                                  int how,
 349                                  struct nfs_commit_info *cinfo,
 350                                  int (*initiate_commit)(struct nfs_commit_data *data,
 351                                                         int how));
 352 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
 353 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
 354 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
 355 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
 356                                       gfp_t gfp_flags);
 357 void nfs4_pnfs_v3_ds_connect_unload(void);
 358 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
 359                           struct nfs4_deviceid_node *devid, unsigned int timeo,
 360                           unsigned int retrans, u32 version, u32 minor_version,
 361                           rpc_authflavor_t au_flavor);
 362 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 363                                                  struct xdr_stream *xdr,
 364                                                  gfp_t gfp_flags);
 365 void pnfs_layout_mark_request_commit(struct nfs_page *req,
 366                                      struct pnfs_layout_segment *lseg,
 367                                      struct nfs_commit_info *cinfo,
 368                                      u32 ds_commit_idx);
 369
 370 static inline bool nfs_have_layout(struct inode *inode)
 371 {
 372         return NFS_I(inode)->layout != NULL;
 373 }
 374
 375 static inline struct nfs4_deviceid_node *
 376 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 377 {
 378         atomic_inc(&d->ref);
 379         return d;
 380 }
 381
 382 static inline void pnfs_set_retry_layoutget(struct pnfs_layout_hdr *lo)
 383 {
 384         if (!test_and_set_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags))
 385                 atomic_inc(&lo->plh_refcount);
 386 }
 387
 388 static inline void pnfs_clear_retry_layoutget(struct pnfs_layout_hdr *lo)
 389 {
 390         if (test_and_clear_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags)) {
 391                 atomic_dec(&lo->plh_refcount);
 392                 /* wake up waiters for LAYOUTRETURN as that is not needed */
 393                 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN);
 394         }
 395 }
 396
 397 static inline bool pnfs_should_retry_layoutget(struct pnfs_layout_hdr *lo)
 398 {
 399         return test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags);
 400 }
 401
 402 static inline struct pnfs_layout_segment *
 403 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 404 {
 405         if (lseg) {
 406                 atomic_inc(&lseg->pls_refcount);
 407                 smp_mb__after_atomic();
 408         }
 409         return lseg;
 410 }
 411
 412 /* Return true if a layout driver is being used for this mountpoint */
 413 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 414 {
 415         return nfss->pnfs_curr_ld != NULL;
 416 }
 417
 418 static inline int
 419 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 420                  struct nfs_commit_info *cinfo)
 421 {
 422         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 423                 return PNFS_NOT_ATTEMPTED;
 424         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 425 }
 426
 427 static inline struct pnfs_ds_commit_info *
 428 pnfs_get_ds_info(struct inode *inode)
 429 {
 430         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 431
 432         if (ld == NULL || ld->get_ds_info == NULL)
 433                 return NULL;
 434         return ld->get_ds_info(inode);
 435 }
 436
 437 static inline void
 438 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
 439 {
 440         set_bit(NFS_DEVICEID_INVALID, &node->flags);
 441 }
 442
 443 static inline bool
 444 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 445                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 446 {
 447         struct inode *inode = d_inode(req->wb_context->dentry);
 448         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 449
 450         if (lseg == NULL || ld->mark_request_commit == NULL)
 451                 return false;
 452         ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
 453         return true;
 454 }
 455
 456 static inline bool
 457 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 458 {
 459         struct inode *inode = d_inode(req->wb_context->dentry);
 460         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 461
 462         if (ld == NULL || ld->clear_request_commit == NULL)
 463                 return false;
 464         ld->clear_request_commit(req, cinfo);
 465         return true;
 466 }
 467
 468 static inline int
 469 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 470                        int max)
 471 {
 472         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 473                 return 0;
 474         else
 475                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 476 }
 477
 478 static inline struct nfs_page *
 479 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 480                         struct page *page)
 481 {
 482         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 483
 484         if (ld == NULL || ld->search_commit_reqs == NULL)
 485                 return NULL;
 486         return ld->search_commit_reqs(cinfo, page);
 487 }
 488
 489 /* Should the pNFS client commit and return the layout upon a setattr */
 490 static inline bool
 491 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 492 {
 493         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 494                 return false;
 495         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 496                 PNFS_LAYOUTRET_ON_SETATTR;
 497 }
 498
 499 static inline bool
 500 pnfs_ld_read_whole_page(struct inode *inode)
 501 {
 502         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 503                 return false;
 504         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
 505 }
 506
 507 static inline int
 508 pnfs_sync_inode(struct inode *inode, bool datasync)
 509 {
 510         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 511                 return 0;
 512         return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
 513 }
 514
 515 static inline bool
 516 pnfs_layoutcommit_outstanding(struct inode *inode)
 517 {
 518         struct nfs_inode *nfsi = NFS_I(inode);
 519
 520         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
 521                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
 522 }
 523
 524 static inline int pnfs_return_layout(struct inode *ino)
 525 {
 526         struct nfs_inode *nfsi = NFS_I(ino);
 527         struct nfs_server *nfss = NFS_SERVER(ino);
 528
 529         if (pnfs_enabled_sb(nfss) && nfsi->layout)
 530                 return _pnfs_return_layout(ino);
 531
 532         return 0;
 533 }
 534
 535 static inline bool
 536 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 537                    struct nfs_server *nfss)
 538 {
 539         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 540                                         nfss->pnfs_curr_ld->id == src->l_type);
 541 }
 542
 543 static inline u64
 544 pnfs_calc_offset_end(u64 offset, u64 len)
 545 {
 546         if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
 547                 return NFS4_MAX_UINT64;
 548         return offset + len - 1;
 549 }
 550
 551 static inline u64
 552 pnfs_calc_offset_length(u64 offset, u64 end)
 553 {
 554         if (end == NFS4_MAX_UINT64 || end <= offset)
 555                 return NFS4_MAX_UINT64;
 556         return 1 + end - offset;
 557 }
 558
 559 extern unsigned int layoutstats_timer;
 560
 561 #ifdef NFS_DEBUG
 562 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 563 #else
 564 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 565 {
 566 }
 567
 568 #endif /* NFS_DEBUG */
 569 #else  /* CONFIG_NFS_V4_1 */
 570
 571 static inline bool nfs_have_layout(struct inode *inode)
 572 {
 573         return false;
 574 }
 575
 576 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 577 {
 578 }
 579
 580 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 581 {
 582 }
 583
 584 static inline struct pnfs_layout_segment *
 585 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 586 {
 587         return NULL;
 588 }
 589
 590 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 591 {
 592 }
 593
 594 static inline int pnfs_return_layout(struct inode *ino)
 595 {
 596         return 0;
 597 }
 598
 599 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 600 {
 601         return 0;
 602 }
 603
 604 static inline bool
 605 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 606 {
 607         return false;
 608 }
 609
 610 static inline bool
 611 pnfs_ld_read_whole_page(struct inode *inode)
 612 {
 613         return false;
 614 }
 615
 616 static inline int
 617 pnfs_sync_inode(struct inode *inode, bool datasync)
 618 {
 619         return 0;
 620 }
 621
 622 static inline bool
 623 pnfs_roc(struct inode *ino)
 624 {
 625         return false;
 626 }
 627
 628 static inline void
 629 pnfs_roc_release(struct inode *ino)
 630 {
 631 }
 632
 633 static inline void
 634 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 635 {
 636 }
 637
 638 static inline void
 639 pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
 640 {
 641 }
 642
 643 static inline bool
 644 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
 645 {
 646         return false;
 647 }
 648
 649 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 650                                          const struct nfs_fh *mntfh, u32 id)
 651 {
 652 }
 653
 654 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 655 {
 656 }
 657
 658 static inline int
 659 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 660                  struct nfs_commit_info *cinfo)
 661 {
 662         return PNFS_NOT_ATTEMPTED;
 663 }
 664
 665 static inline struct pnfs_ds_commit_info *
 666 pnfs_get_ds_info(struct inode *inode)
 667 {
 668         return NULL;
 669 }
 670
 671 static inline bool
 672 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 673                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 674 {
 675         return false;
 676 }
 677
 678 static inline bool
 679 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 680 {
 681         return false;
 682 }
 683
 684 static inline int
 685 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 686                        int max)
 687 {
 688         return 0;
 689 }
 690
 691 static inline struct nfs_page *
 692 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 693                         struct page *page)
 694 {
 695         return NULL;
 696 }
 697
 698 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 699 {
 700         return 0;
 701 }
 702
 703 static inline bool
 704 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 705                    struct nfs_server *nfss)
 706 {
 707         return false;
 708 }
 709
 710 static inline bool
 711 pnfs_layoutcommit_outstanding(struct inode *inode)
 712 {
 713         return false;
 714 }
 715
 716
 717 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 718 {
 719         return NULL;
 720 }
 721
 722 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 723 {
 724 }
 725
 726 #endif /* CONFIG_NFS_V4_1 */
 727
 728 #if IS_ENABLED(CONFIG_NFS_V4_2)
 729 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
 730 #else
 731 static inline int
 732 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
 733 {
 734         return 0;
 735 }
 736 #endif
 737
 738 #endif /* FS_NFS_PNFS_H */