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_REQUESTED,    /* Return this layout ASAP */
 100         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
 101         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first 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         u32                     plh_return_seq;
 199         enum pnfs_iomode        plh_return_iomode;
 200         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 201         struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
 202         struct inode            *plh_inode;
 203 };
 204
 205 struct pnfs_device {
 206         struct nfs4_deviceid dev_id;
 207         unsigned int  layout_type;
 208         unsigned int  mincount;
 209         unsigned int  maxcount; /* gdia_maxcount */
 210         struct page **pages;
 211         unsigned int  pgbase;
 212         unsigned int  pglen;    /* reply buffer length */
 213         unsigned char nocache : 1;/* May not be cached */
 214 };
 215
 216 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 217
 218 struct pnfs_devicelist {
 219         unsigned int            eof;
 220         unsigned int            num_devs;
 221         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 222 };
 223
 224 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 225 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 226
 227 /* nfs4proc.c */
 228 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 229                                    struct pnfs_device *dev,
 230                                    struct rpc_cred *cred);
 231 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags);
 232 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
 233
 234 /* pnfs.c */
 235 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 236 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 237 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
 238
 239 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
 240 void unset_pnfs_layoutdriver(struct nfs_server *);
 241 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 242 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 243 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 244                                 struct nfs_page *req, u64 wb_size);
 245 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
 246 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 247 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 248                             struct nfs_page *prev, struct nfs_page *req);
 249 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 250 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 251 void pnfs_free_lseg_list(struct list_head *tmp_list);
 252 void pnfs_destroy_layout(struct nfs_inode *);
 253 void pnfs_destroy_all_layouts(struct nfs_client *);
 254 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 255                 struct nfs_fsid *fsid,
 256                 bool is_recall);
 257 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 258                 bool is_recall);
 259 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 260 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 261                              const nfs4_stateid *new,
 262                              bool update_barrier);
 263 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 264                                 struct list_head *tmp_list,
 265                                 const struct pnfs_layout_range *recall_range,
 266                                 u32 seq);
 267 int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
 268                                 struct list_head *tmp_list,
 269                                 const struct pnfs_layout_range *recall_range,
 270                                 u32 seq);
 271 bool pnfs_roc(struct inode *ino);
 272 void pnfs_roc_release(struct inode *ino);
 273 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
 274 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier);
 275 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
 276 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
 277 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 278 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 279 int pnfs_generic_sync(struct inode *inode, bool datasync);
 280 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
 281 int _pnfs_return_layout(struct inode *);
 282 int pnfs_commit_and_return_layout(struct inode *);
 283 void pnfs_ld_write_done(struct nfs_pgio_header *);
 284 void pnfs_ld_read_done(struct nfs_pgio_header *);
 285 void pnfs_read_resend_pnfs(struct nfs_pgio_header *);
 286 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 287                                                struct nfs_open_context *ctx,
 288                                                loff_t pos,
 289                                                u64 count,
 290                                                enum pnfs_iomode iomode,
 291                                                bool strict_iomode,
 292                                                gfp_t gfp_flags);
 293 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo);
 294
 295 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
 296                    struct pnfs_layout_segment *lseg,
 297                    bool (*is_after)(const struct pnfs_layout_range *lseg_range,
 298                            const struct pnfs_layout_range *old),
 299                    bool (*do_merge)(struct pnfs_layout_segment *lseg,
 300                            struct pnfs_layout_segment *old),
 301                    struct list_head *free_me);
 302
 303 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 304 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 305 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 306 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 307 void pnfs_error_mark_layout_for_return(struct inode *inode,
 308                                        struct pnfs_layout_segment *lseg);
 309 /* nfs4_deviceid_flags */
 310 enum {
 311         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 312         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 313         NFS_DEVICEID_NOCACHE,           /* device may not be cached */
 314 };
 315
 316 /* pnfs_dev.c */
 317 struct nfs4_deviceid_node {
 318         struct hlist_node               node;
 319         struct hlist_node               tmpnode;
 320         const struct pnfs_layoutdriver_type *ld;
 321         const struct nfs_client         *nfs_client;
 322         unsigned long                   flags;
 323         unsigned long                   timestamp_unavailable;
 324         struct nfs4_deviceid            deviceid;
 325         struct rcu_head                 rcu;
 326         atomic_t                        ref;
 327 };
 328
 329 struct nfs4_deviceid_node *
 330 nfs4_find_get_deviceid(struct nfs_server *server,
 331                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
 332                 gfp_t gfp_mask);
 333 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 334 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 335                              const struct nfs4_deviceid *);
 336 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 337 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 338 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 339 void nfs4_deviceid_purge_client(const struct nfs_client *);
 340
 341 /* pnfs_nfs.c */
 342 void pnfs_generic_clear_request_commit(struct nfs_page *req,
 343                                        struct nfs_commit_info *cinfo);
 344 void pnfs_generic_commit_release(void *calldata);
 345 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
 346 void pnfs_generic_rw_release(void *data);
 347 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
 348                                       struct nfs_commit_info *cinfo);
 349 int pnfs_generic_commit_pagelist(struct inode *inode,
 350                                  struct list_head *mds_pages,
 351                                  int how,
 352                                  struct nfs_commit_info *cinfo,
 353                                  int (*initiate_commit)(struct nfs_commit_data *data,
 354                                                         int how));
 355 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
 356 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
 357 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
 358 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
 359                                       gfp_t gfp_flags);
 360 void nfs4_pnfs_v3_ds_connect_unload(void);
 361 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
 362                           struct nfs4_deviceid_node *devid, unsigned int timeo,
 363                           unsigned int retrans, u32 version, u32 minor_version,
 364                           rpc_authflavor_t au_flavor);
 365 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 366                                                  struct xdr_stream *xdr,
 367                                                  gfp_t gfp_flags);
 368 void pnfs_layout_mark_request_commit(struct nfs_page *req,
 369                                      struct pnfs_layout_segment *lseg,
 370                                      struct nfs_commit_info *cinfo,
 371                                      u32 ds_commit_idx);
 372
 373 static inline bool nfs_have_layout(struct inode *inode)
 374 {
 375         return NFS_I(inode)->layout != NULL;
 376 }
 377
 378 static inline struct nfs4_deviceid_node *
 379 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 380 {
 381         atomic_inc(&d->ref);
 382         return d;
 383 }
 384
 385 static inline struct pnfs_layout_segment *
 386 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 387 {
 388         if (lseg) {
 389                 atomic_inc(&lseg->pls_refcount);
 390                 smp_mb__after_atomic();
 391         }
 392         return lseg;
 393 }
 394
 395 static inline bool
 396 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
 397 {
 398         return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
 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 static inline u64
 533 pnfs_calc_offset_end(u64 offset, u64 len)
 534 {
 535         if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
 536                 return NFS4_MAX_UINT64;
 537         return offset + len - 1;
 538 }
 539
 540 static inline u64
 541 pnfs_calc_offset_length(u64 offset, u64 end)
 542 {
 543         if (end == NFS4_MAX_UINT64 || end <= offset)
 544                 return NFS4_MAX_UINT64;
 545         return 1 + end - offset;
 546 }
 547
 548 /**
 549  * pnfs_mark_layout_returned_if_empty - marks the layout as returned
 550  * @lo: layout header
 551  *
 552  * Note: Caller must hold inode->i_lock
 553  */
 554 static inline void
 555 pnfs_mark_layout_returned_if_empty(struct pnfs_layout_hdr *lo)
 556 {
 557         if (list_empty(&lo->plh_segs))
 558                 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
 559 }
 560
 561 static inline void
 562 pnfs_copy_range(struct pnfs_layout_range *dst,
 563                 const struct pnfs_layout_range *src)
 564 {
 565         memcpy(dst, src, sizeof(*dst));
 566 }
 567
 568 extern unsigned int layoutstats_timer;
 569
 570 #ifdef NFS_DEBUG
 571 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 572 #else
 573 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 574 {
 575 }
 576
 577 #endif /* NFS_DEBUG */
 578 #else  /* CONFIG_NFS_V4_1 */
 579
 580 static inline bool nfs_have_layout(struct inode *inode)
 581 {
 582         return false;
 583 }
 584
 585 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 586 {
 587 }
 588
 589 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 590 {
 591 }
 592
 593 static inline struct pnfs_layout_segment *
 594 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 595 {
 596         return NULL;
 597 }
 598
 599 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 600 {
 601 }
 602
 603 static inline int pnfs_return_layout(struct inode *ino)
 604 {
 605         return 0;
 606 }
 607
 608 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 609 {
 610         return 0;
 611 }
 612
 613 static inline bool
 614 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 615 {
 616         return false;
 617 }
 618
 619 static inline bool
 620 pnfs_ld_read_whole_page(struct inode *inode)
 621 {
 622         return false;
 623 }
 624
 625 static inline int
 626 pnfs_sync_inode(struct inode *inode, bool datasync)
 627 {
 628         return 0;
 629 }
 630
 631 static inline bool
 632 pnfs_roc(struct inode *ino)
 633 {
 634         return false;
 635 }
 636
 637 static inline void
 638 pnfs_roc_release(struct inode *ino)
 639 {
 640 }
 641
 642 static inline void
 643 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 644 {
 645 }
 646
 647 static inline void
 648 pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
 649 {
 650 }
 651
 652 static inline bool
 653 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
 654 {
 655         return false;
 656 }
 657
 658 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 659                                          const struct nfs_fh *mntfh, u32 id)
 660 {
 661 }
 662
 663 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 664 {
 665 }
 666
 667 static inline int
 668 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 669                  struct nfs_commit_info *cinfo)
 670 {
 671         return PNFS_NOT_ATTEMPTED;
 672 }
 673
 674 static inline struct pnfs_ds_commit_info *
 675 pnfs_get_ds_info(struct inode *inode)
 676 {
 677         return NULL;
 678 }
 679
 680 static inline bool
 681 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 682                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 683 {
 684         return false;
 685 }
 686
 687 static inline bool
 688 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 689 {
 690         return false;
 691 }
 692
 693 static inline int
 694 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 695                        int max)
 696 {
 697         return 0;
 698 }
 699
 700 static inline struct nfs_page *
 701 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 702                         struct page *page)
 703 {
 704         return NULL;
 705 }
 706
 707 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 708 {
 709         return 0;
 710 }
 711
 712 static inline bool
 713 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 714                    struct nfs_server *nfss)
 715 {
 716         return false;
 717 }
 718
 719 static inline bool
 720 pnfs_layoutcommit_outstanding(struct inode *inode)
 721 {
 722         return false;
 723 }
 724
 725
 726 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 727 {
 728         return NULL;
 729 }
 730
 731 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 732 {
 733 }
 734
 735 #endif /* CONFIG_NFS_V4_1 */
 736
 737 #if IS_ENABLED(CONFIG_NFS_V4_2)
 738 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
 739 #else
 740 static inline int
 741 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
 742 {
 743         return 0;
 744 }
 745 #endif
 746
 747 #endif /* FS_NFS_PNFS_H */