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         u32 pls_seq;
  68         unsigned long pls_flags;
  69         struct pnfs_layout_hdr *pls_layout;
  70         struct work_struct pls_work;
  71 };
  72
  73 enum pnfs_try_status {
  74         PNFS_ATTEMPTED     = 0,
  75         PNFS_NOT_ATTEMPTED = 1,
  76         PNFS_TRY_AGAIN     = 2,
  77 };
  78
  79 #ifdef CONFIG_NFS_V4_1
  80
  81 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
  82
  83 /*
  84  * Default data server connection timeout and retrans vaules.
  85  * Set by module parameters dataserver_timeo and dataserver_retrans.
  86  */
  87 #define NFS4_DEF_DS_TIMEO   600 /* in tenths of a second */
  88 #define NFS4_DEF_DS_RETRANS 5
  89
  90 /* error codes for internal use */
  91 #define NFS4ERR_RESET_TO_MDS   12001
  92 #define NFS4ERR_RESET_TO_PNFS  12002
  93
  94 enum {
  95         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
  96         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
  97         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
  98         NFS_LAYOUT_RETURN,              /* layoutreturn in progress */
  99         NFS_LAYOUT_RETURN_LOCK,         /* Serialise layoutreturn */
 100         NFS_LAYOUT_RETURN_REQUESTED,    /* Return this layout ASAP */
 101         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
 102         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first 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         void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
 133                         struct pnfs_layout_segment *lseg,
 134                         struct list_head *free_me);
 135
 136         void (*return_range) (struct pnfs_layout_hdr *lo,
 137                               struct pnfs_layout_range *range);
 138
 139         /* test for nfs page cache coalescing */
 140         const struct nfs_pageio_ops *pg_read_ops;
 141         const struct nfs_pageio_ops *pg_write_ops;
 142
 143         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
 144         void (*mark_request_commit) (struct nfs_page *req,
 145                                      struct pnfs_layout_segment *lseg,
 146                                      struct nfs_commit_info *cinfo,
 147                                      u32 ds_commit_idx);
 148         void (*clear_request_commit) (struct nfs_page *req,
 149                                       struct nfs_commit_info *cinfo);
 150         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 151                                   int max);
 152         void (*recover_commit_reqs) (struct list_head *list,
 153                                      struct nfs_commit_info *cinfo);
 154         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
 155                                                 struct page *page);
 156         int (*commit_pagelist)(struct inode *inode,
 157                                struct list_head *mds_pages,
 158                                int how,
 159                                struct nfs_commit_info *cinfo);
 160
 161         int (*sync)(struct inode *inode, bool datasync);
 162
 163         /*
 164          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 165          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 166          */
 167         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 168         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 169
 170         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 171         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 172                         (struct nfs_server *server, struct pnfs_device *pdev,
 173                         gfp_t gfp_flags);
 174
 175         void (*encode_layoutreturn) (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         struct list_head        plh_return_segs; /* invalid layout segments */
 194         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 195         unsigned long           plh_retry_timestamp;
 196         unsigned long           plh_flags;
 197         nfs4_stateid            plh_stateid;
 198         u32                     plh_barrier; /* ignore lower seqids */
 199         u32                     plh_return_seq;
 200         enum pnfs_iomode        plh_return_iomode;
 201         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 202         struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
 203         struct inode            *plh_inode;
 204 };
 205
 206 struct pnfs_device {
 207         struct nfs4_deviceid dev_id;
 208         unsigned int  layout_type;
 209         unsigned int  mincount;
 210         unsigned int  maxcount; /* gdia_maxcount */
 211         struct page **pages;
 212         unsigned int  pgbase;
 213         unsigned int  pglen;    /* reply buffer length */
 214         unsigned char nocache : 1;/* May not be cached */
 215 };
 216
 217 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 218
 219 struct pnfs_devicelist {
 220         unsigned int            eof;
 221         unsigned int            num_devs;
 222         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 223 };
 224
 225 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 226 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 227
 228 /* nfs4proc.c */
 229 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 230                                    struct pnfs_device *dev,
 231                                    struct rpc_cred *cred);
 232 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags);
 233 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
 234
 235 /* pnfs.c */
 236 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 237 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 238 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
 239
 240 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
 241 void unset_pnfs_layoutdriver(struct nfs_server *);
 242 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 243 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 244 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 245                                 struct nfs_page *req, u64 wb_size);
 246 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
 247 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 248 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 249                             struct nfs_page *prev, struct nfs_page *req);
 250 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 251 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 252 void pnfs_free_lseg_list(struct list_head *tmp_list);
 253 void pnfs_destroy_layout(struct nfs_inode *);
 254 void pnfs_destroy_all_layouts(struct nfs_client *);
 255 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 256                 struct nfs_fsid *fsid,
 257                 bool is_recall);
 258 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 259                 bool is_recall);
 260 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 261 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 262                              const nfs4_stateid *new,
 263                              bool update_barrier);
 264 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 265                                 struct list_head *tmp_list,
 266                                 const struct pnfs_layout_range *recall_range,
 267                                 u32 seq);
 268 int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
 269                                 struct list_head *tmp_list,
 270                                 const struct pnfs_layout_range *recall_range,
 271                                 u32 seq);
 272 int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
 273                 struct list_head *lseg_list);
 274 bool pnfs_roc(struct inode *ino);
 275 void pnfs_roc_release(struct inode *ino);
 276 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
 277 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier);
 278 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
 279 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
 280 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 281 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 282 int pnfs_generic_sync(struct inode *inode, bool datasync);
 283 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
 284 int _pnfs_return_layout(struct inode *);
 285 int pnfs_commit_and_return_layout(struct inode *);
 286 void pnfs_ld_write_done(struct nfs_pgio_header *);
 287 void pnfs_ld_read_done(struct nfs_pgio_header *);
 288 void pnfs_read_resend_pnfs(struct nfs_pgio_header *);
 289 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 290                                                struct nfs_open_context *ctx,
 291                                                loff_t pos,
 292                                                u64 count,
 293                                                enum pnfs_iomode iomode,
 294                                                bool strict_iomode,
 295                                                gfp_t gfp_flags);
 296 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
 297                 const nfs4_stateid *arg_stateid,
 298                 const struct pnfs_layout_range *range,
 299                 const nfs4_stateid *stateid);
 300
 301 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
 302                    struct pnfs_layout_segment *lseg,
 303                    bool (*is_after)(const struct pnfs_layout_range *lseg_range,
 304                            const struct pnfs_layout_range *old),
 305                    bool (*do_merge)(struct pnfs_layout_segment *lseg,
 306                            struct pnfs_layout_segment *old),
 307                    struct list_head *free_me);
 308
 309 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 310 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 311 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 312 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 313 void pnfs_error_mark_layout_for_return(struct inode *inode,
 314                                        struct pnfs_layout_segment *lseg);
 315 /* nfs4_deviceid_flags */
 316 enum {
 317         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 318         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 319         NFS_DEVICEID_NOCACHE,           /* device may not be cached */
 320 };
 321
 322 /* pnfs_dev.c */
 323 struct nfs4_deviceid_node {
 324         struct hlist_node               node;
 325         struct hlist_node               tmpnode;
 326         const struct pnfs_layoutdriver_type *ld;
 327         const struct nfs_client         *nfs_client;
 328         unsigned long                   flags;
 329         unsigned long                   timestamp_unavailable;
 330         struct nfs4_deviceid            deviceid;
 331         struct rcu_head                 rcu;
 332         atomic_t                        ref;
 333 };
 334
 335 struct nfs4_deviceid_node *
 336 nfs4_find_get_deviceid(struct nfs_server *server,
 337                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
 338                 gfp_t gfp_mask);
 339 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 340 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 341                              const struct nfs4_deviceid *);
 342 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 343 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 344 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 345 void nfs4_deviceid_purge_client(const struct nfs_client *);
 346
 347 /* pnfs_nfs.c */
 348 void pnfs_generic_clear_request_commit(struct nfs_page *req,
 349                                        struct nfs_commit_info *cinfo);
 350 void pnfs_generic_commit_release(void *calldata);
 351 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
 352 void pnfs_generic_rw_release(void *data);
 353 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
 354                                       struct nfs_commit_info *cinfo);
 355 int pnfs_generic_commit_pagelist(struct inode *inode,
 356                                  struct list_head *mds_pages,
 357                                  int how,
 358                                  struct nfs_commit_info *cinfo,
 359                                  int (*initiate_commit)(struct nfs_commit_data *data,
 360                                                         int how));
 361 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
 362 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
 363 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
 364 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
 365                                       gfp_t gfp_flags);
 366 void nfs4_pnfs_v3_ds_connect_unload(void);
 367 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
 368                           struct nfs4_deviceid_node *devid, unsigned int timeo,
 369                           unsigned int retrans, u32 version, u32 minor_version,
 370                           rpc_authflavor_t au_flavor);
 371 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 372                                                  struct xdr_stream *xdr,
 373                                                  gfp_t gfp_flags);
 374 void pnfs_layout_mark_request_commit(struct nfs_page *req,
 375                                      struct pnfs_layout_segment *lseg,
 376                                      struct nfs_commit_info *cinfo,
 377                                      u32 ds_commit_idx);
 378
 379 static inline bool nfs_have_layout(struct inode *inode)
 380 {
 381         return NFS_I(inode)->layout != NULL;
 382 }
 383
 384 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
 385 {
 386         return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
 387 }
 388
 389 static inline struct nfs4_deviceid_node *
 390 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 391 {
 392         atomic_inc(&d->ref);
 393         return d;
 394 }
 395
 396 static inline struct pnfs_layout_segment *
 397 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 398 {
 399         if (lseg) {
 400                 atomic_inc(&lseg->pls_refcount);
 401                 smp_mb__after_atomic();
 402         }
 403         return lseg;
 404 }
 405
 406 static inline bool
 407 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
 408 {
 409         return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
 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 static inline void
 560 pnfs_copy_range(struct pnfs_layout_range *dst,
 561                 const struct pnfs_layout_range *src)
 562 {
 563         memcpy(dst, src, sizeof(*dst));
 564 }
 565
 566 static inline u64
 567 pnfs_end_offset(u64 start, u64 len)
 568 {
 569         if (NFS4_MAX_UINT64 - start <= len)
 570                 return NFS4_MAX_UINT64;
 571         return start + len;
 572 }
 573
 574 /*
 575  * Are 2 ranges intersecting?
 576  *   start1                             end1
 577  *   [----------------------------------)
 578  *                                start2           end2
 579  *                                [----------------)
 580  */
 581 static inline bool
 582 pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
 583 {
 584         return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
 585                 (end2 == NFS4_MAX_UINT64 || start1 < end2);
 586 }
 587
 588 static inline bool
 589 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
 590                 const struct pnfs_layout_range *l2)
 591 {
 592         u64 end1 = pnfs_end_offset(l1->offset, l1->length);
 593         u64 end2 = pnfs_end_offset(l2->offset, l2->length);
 594
 595         return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
 596 }
 597
 598 extern unsigned int layoutstats_timer;
 599
 600 #ifdef NFS_DEBUG
 601 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 602 #else
 603 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 604 {
 605 }
 606
 607 #endif /* NFS_DEBUG */
 608 #else  /* CONFIG_NFS_V4_1 */
 609
 610 static inline bool nfs_have_layout(struct inode *inode)
 611 {
 612         return false;
 613 }
 614
 615 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 616 {
 617 }
 618
 619 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 620 {
 621 }
 622
 623 static inline struct pnfs_layout_segment *
 624 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 625 {
 626         return NULL;
 627 }
 628
 629 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 630 {
 631 }
 632
 633 static inline int pnfs_return_layout(struct inode *ino)
 634 {
 635         return 0;
 636 }
 637
 638 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 639 {
 640         return 0;
 641 }
 642
 643 static inline bool
 644 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 645 {
 646         return false;
 647 }
 648
 649 static inline bool
 650 pnfs_ld_read_whole_page(struct inode *inode)
 651 {
 652         return false;
 653 }
 654
 655 static inline int
 656 pnfs_sync_inode(struct inode *inode, bool datasync)
 657 {
 658         return 0;
 659 }
 660
 661 static inline bool
 662 pnfs_layoutcommit_outstanding(struct inode *inode)
 663 {
 664         return false;
 665 }
 666
 667
 668 static inline bool
 669 pnfs_roc(struct inode *ino)
 670 {
 671         return false;
 672 }
 673
 674 static inline void
 675 pnfs_roc_release(struct inode *ino)
 676 {
 677 }
 678
 679 static inline void
 680 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 681 {
 682 }
 683
 684 static inline void
 685 pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
 686 {
 687 }
 688
 689 static inline bool
 690 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
 691 {
 692         return false;
 693 }
 694
 695 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 696                                          const struct nfs_fh *mntfh,
 697                                          struct nfs_fsinfo *fsinfo)
 698 {
 699 }
 700
 701 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 702 {
 703 }
 704
 705 static inline int
 706 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 707                  struct nfs_commit_info *cinfo)
 708 {
 709         return PNFS_NOT_ATTEMPTED;
 710 }
 711
 712 static inline struct pnfs_ds_commit_info *
 713 pnfs_get_ds_info(struct inode *inode)
 714 {
 715         return NULL;
 716 }
 717
 718 static inline bool
 719 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 720                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 721 {
 722         return false;
 723 }
 724
 725 static inline bool
 726 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 727 {
 728         return false;
 729 }
 730
 731 static inline int
 732 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 733                        int max)
 734 {
 735         return 0;
 736 }
 737
 738 static inline struct nfs_page *
 739 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 740                         struct page *page)
 741 {
 742         return NULL;
 743 }
 744
 745 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 746 {
 747         return 0;
 748 }
 749
 750 static inline bool
 751 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 752                    struct nfs_server *nfss)
 753 {
 754         return false;
 755 }
 756
 757 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 758 {
 759         return NULL;
 760 }
 761
 762 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 763 {
 764 }
 765
 766 #endif /* CONFIG_NFS_V4_1 */
 767
 768 #if IS_ENABLED(CONFIG_NFS_V4_2)
 769 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
 770 #else
 771 static inline int
 772 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
 773 {
 774         return 0;
 775 }
 776 #endif
 777
 778 #endif /* FS_NFS_PNFS_H */