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/refcount.h>
  34 #include <linux/nfs_fs.h>
  35 #include <linux/nfs_page.h>
  36 #include <linux/workqueue.h>
  37
  38 enum {
  39         NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
  40         NFS_LSEG_ROC,           /* roc bit received from server */
  41         NFS_LSEG_LAYOUTCOMMIT,  /* layoutcommit bit set for layoutcommit */
  42         NFS_LSEG_LAYOUTRETURN,  /* layoutreturn bit set for layoutreturn */
  43 };
  44
  45 /* Individual ip address */
  46 struct nfs4_pnfs_ds_addr {
  47         struct sockaddr_storage da_addr;
  48         size_t                  da_addrlen;
  49         struct list_head        da_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  50         char                    *da_remotestr;  /* human readable addr+port */
  51 };
  52
  53 struct nfs4_pnfs_ds {
  54         struct list_head        ds_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  55         char                    *ds_remotestr;  /* comma sep list of addrs */
  56         struct list_head        ds_addrs;
  57         struct nfs_client       *ds_clp;
  58         refcount_t              ds_count;
  59         unsigned long           ds_state;
  60 #define NFS4DS_CONNECTING       0       /* ds is establishing connection */
  61 };
  62
  63 struct pnfs_layout_segment {
  64         struct list_head pls_list;
  65         struct list_head pls_lc_list;
  66         struct pnfs_layout_range pls_range;
  67         refcount_t pls_refcount;
  68         u32 pls_seq;
  69         unsigned long pls_flags;
  70         struct pnfs_layout_hdr *pls_layout;
  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         NFS_LAYOUT_INODE_FREEING,       /* The inode is being freed */
 104 };
 105
 106 enum layoutdriver_policy_flags {
 107         /* Should the pNFS client commit and return the layout upon truncate to
 108          * a smaller size */
 109         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
 110         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
 111         PNFS_READ_WHOLE_PAGE            = 1 << 2,
 112 };
 113
 114 struct nfs4_deviceid_node;
 115
 116 /* Per-layout driver specific registration structure */
 117 struct pnfs_layoutdriver_type {
 118         struct list_head pnfs_tblid;
 119         const u32 id;
 120         const char *name;
 121         struct module *owner;
 122         unsigned flags;
 123         unsigned max_deviceinfo_size;
 124
 125         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
 126         int (*clear_layoutdriver) (struct nfs_server *);
 127
 128         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
 129         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
 130
 131         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
 132         void (*free_lseg) (struct pnfs_layout_segment *lseg);
 133         void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
 134                         struct pnfs_layout_segment *lseg,
 135                         struct list_head *free_me);
 136
 137         void (*return_range) (struct pnfs_layout_hdr *lo,
 138                               struct pnfs_layout_range *range);
 139
 140         /* test for nfs page cache coalescing */
 141         const struct nfs_pageio_ops *pg_read_ops;
 142         const struct nfs_pageio_ops *pg_write_ops;
 143
 144         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
 145         void (*mark_request_commit) (struct nfs_page *req,
 146                                      struct pnfs_layout_segment *lseg,
 147                                      struct nfs_commit_info *cinfo,
 148                                      u32 ds_commit_idx);
 149         void (*clear_request_commit) (struct nfs_page *req,
 150                                       struct nfs_commit_info *cinfo);
 151         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 152                                   int max);
 153         void (*recover_commit_reqs) (struct list_head *list,
 154                                      struct nfs_commit_info *cinfo);
 155         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
 156                                                 struct page *page);
 157         int (*commit_pagelist)(struct inode *inode,
 158                                struct list_head *mds_pages,
 159                                int how,
 160                                struct nfs_commit_info *cinfo);
 161
 162         int (*sync)(struct inode *inode, bool datasync);
 163
 164         /*
 165          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 166          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 167          */
 168         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 169         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 170
 171         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 172         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 173                         (struct nfs_server *server, struct pnfs_device *pdev,
 174                         gfp_t gfp_flags);
 175
 176         int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);
 177
 178         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 179         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
 180         int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
 181 };
 182
 183 struct pnfs_layout_hdr {
 184         refcount_t              plh_refcount;
 185         atomic_t                plh_outstanding; /* number of RPCs out */
 186         struct list_head        plh_layouts;   /* other client layouts */
 187         struct list_head        plh_bulk_destroy;
 188         struct list_head        plh_segs;      /* layout segments list */
 189         struct list_head        plh_return_segs; /* invalid layout segments */
 190         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 191         unsigned long           plh_retry_timestamp;
 192         unsigned long           plh_flags;
 193         nfs4_stateid            plh_stateid;
 194         u32                     plh_barrier; /* ignore lower seqids */
 195         u32                     plh_return_seq;
 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, long *timeout, 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
 235 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
 236 void unset_pnfs_layoutdriver(struct nfs_server *);
 237 void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
 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 bool nfs4_refresh_layout_stateid(nfs4_stateid *dst, struct inode *inode);
 257 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 258 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 259                              const nfs4_stateid *new,
 260                              bool update_barrier);
 261 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 262                                 struct list_head *tmp_list,
 263                                 const struct pnfs_layout_range *recall_range,
 264                                 u32 seq);
 265 int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
 266                                 struct list_head *tmp_list,
 267                                 const struct pnfs_layout_range *recall_range,
 268                                 u32 seq);
 269 int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
 270                 struct list_head *lseg_list);
 271 bool pnfs_roc(struct inode *ino,
 272                 struct nfs4_layoutreturn_args *args,
 273                 struct nfs4_layoutreturn_res *res,
 274                 const struct rpc_cred *cred);
 275 void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
 276                 struct nfs4_layoutreturn_res *res,
 277                 int ret);
 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 int 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 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 371                                                  struct xdr_stream *xdr,
 372                                                  gfp_t gfp_flags);
 373 void pnfs_layout_mark_request_commit(struct nfs_page *req,
 374                                      struct pnfs_layout_segment *lseg,
 375                                      struct nfs_commit_info *cinfo,
 376                                      u32 ds_commit_idx);
 377
 378 static inline bool nfs_have_layout(struct inode *inode)
 379 {
 380         return NFS_I(inode)->layout != NULL;
 381 }
 382
 383 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
 384 {
 385         return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
 386 }
 387
 388 static inline struct nfs4_deviceid_node *
 389 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 390 {
 391         atomic_inc(&d->ref);
 392         return d;
 393 }
 394
 395 static inline struct pnfs_layout_segment *
 396 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 397 {
 398         if (lseg) {
 399                 refcount_inc(&lseg->pls_refcount);
 400                 smp_mb__after_atomic();
 401         }
 402         return lseg;
 403 }
 404
 405 static inline bool
 406 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
 407 {
 408         return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
 409 }
 410
 411 /* Return true if a layout driver is being used for this mountpoint */
 412 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 413 {
 414         return nfss->pnfs_curr_ld != NULL;
 415 }
 416
 417 static inline int
 418 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 419                  struct nfs_commit_info *cinfo)
 420 {
 421         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 422                 return PNFS_NOT_ATTEMPTED;
 423         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 424 }
 425
 426 static inline struct pnfs_ds_commit_info *
 427 pnfs_get_ds_info(struct inode *inode)
 428 {
 429         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 430
 431         if (ld == NULL || ld->get_ds_info == NULL)
 432                 return NULL;
 433         return ld->get_ds_info(inode);
 434 }
 435
 436 static inline void
 437 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
 438 {
 439         set_bit(NFS_DEVICEID_INVALID, &node->flags);
 440 }
 441
 442 static inline bool
 443 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 444                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 445 {
 446         struct inode *inode = d_inode(req->wb_context->dentry);
 447         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 448
 449         if (lseg == NULL || ld->mark_request_commit == NULL)
 450                 return false;
 451         ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
 452         return true;
 453 }
 454
 455 static inline bool
 456 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 457 {
 458         struct inode *inode = d_inode(req->wb_context->dentry);
 459         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 460
 461         if (ld == NULL || ld->clear_request_commit == NULL)
 462                 return false;
 463         ld->clear_request_commit(req, cinfo);
 464         return true;
 465 }
 466
 467 static inline int
 468 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 469                        int max)
 470 {
 471         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 472                 return 0;
 473         else
 474                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 475 }
 476
 477 static inline struct nfs_page *
 478 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 479                         struct page *page)
 480 {
 481         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 482
 483         if (ld == NULL || ld->search_commit_reqs == NULL)
 484                 return NULL;
 485         return ld->search_commit_reqs(cinfo, page);
 486 }
 487
 488 /* Should the pNFS client commit and return the layout upon a setattr */
 489 static inline bool
 490 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 491 {
 492         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 493                 return false;
 494         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 495                 PNFS_LAYOUTRET_ON_SETATTR;
 496 }
 497
 498 static inline bool
 499 pnfs_ld_read_whole_page(struct inode *inode)
 500 {
 501         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 502                 return false;
 503         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
 504 }
 505
 506 static inline int
 507 pnfs_sync_inode(struct inode *inode, bool datasync)
 508 {
 509         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 510                 return 0;
 511         return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
 512 }
 513
 514 static inline bool
 515 pnfs_layoutcommit_outstanding(struct inode *inode)
 516 {
 517         struct nfs_inode *nfsi = NFS_I(inode);
 518
 519         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
 520                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
 521 }
 522
 523 static inline int pnfs_return_layout(struct inode *ino)
 524 {
 525         struct nfs_inode *nfsi = NFS_I(ino);
 526         struct nfs_server *nfss = NFS_SERVER(ino);
 527
 528         if (pnfs_enabled_sb(nfss) && nfsi->layout)
 529                 return _pnfs_return_layout(ino);
 530
 531         return 0;
 532 }
 533
 534 static inline bool
 535 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 536                    struct nfs_server *nfss)
 537 {
 538         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 539                                         nfss->pnfs_curr_ld->id == src->l_type);
 540 }
 541
 542 static inline u64
 543 pnfs_calc_offset_end(u64 offset, u64 len)
 544 {
 545         if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
 546                 return NFS4_MAX_UINT64;
 547         return offset + len - 1;
 548 }
 549
 550 static inline u64
 551 pnfs_calc_offset_length(u64 offset, u64 end)
 552 {
 553         if (end == NFS4_MAX_UINT64 || end <= offset)
 554                 return NFS4_MAX_UINT64;
 555         return 1 + end - offset;
 556 }
 557
 558 static inline void
 559 pnfs_copy_range(struct pnfs_layout_range *dst,
 560                 const struct pnfs_layout_range *src)
 561 {
 562         memcpy(dst, src, sizeof(*dst));
 563 }
 564
 565 static inline u64
 566 pnfs_end_offset(u64 start, u64 len)
 567 {
 568         if (NFS4_MAX_UINT64 - start <= len)
 569                 return NFS4_MAX_UINT64;
 570         return start + len;
 571 }
 572
 573 /*
 574  * Are 2 ranges intersecting?
 575  *   start1                             end1
 576  *   [----------------------------------)
 577  *                                start2           end2
 578  *                                [----------------)
 579  */
 580 static inline bool
 581 pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
 582 {
 583         return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
 584                 (end2 == NFS4_MAX_UINT64 || start1 < end2);
 585 }
 586
 587 static inline bool
 588 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
 589                 const struct pnfs_layout_range *l2)
 590 {
 591         u64 end1 = pnfs_end_offset(l1->offset, l1->length);
 592         u64 end2 = pnfs_end_offset(l2->offset, l2->length);
 593
 594         return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
 595 }
 596
 597 static inline bool
 598 pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
 599 {
 600         u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
 601         u64 req_last = req_offset(req) + req->wb_bytes;
 602
 603         return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
 604                                 req_offset(req), req_last);
 605 }
 606
 607 extern unsigned int layoutstats_timer;
 608
 609 #ifdef NFS_DEBUG
 610 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 611 #else
 612 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 613 {
 614 }
 615
 616 #endif /* NFS_DEBUG */
 617 #else  /* CONFIG_NFS_V4_1 */
 618
 619 static inline bool nfs_have_layout(struct inode *inode)
 620 {
 621         return false;
 622 }
 623
 624 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 625 {
 626 }
 627
 628 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 629 {
 630 }
 631
 632 static inline struct pnfs_layout_segment *
 633 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 634 {
 635         return NULL;
 636 }
 637
 638 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 639 {
 640 }
 641
 642 static inline int pnfs_return_layout(struct inode *ino)
 643 {
 644         return 0;
 645 }
 646
 647 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 648 {
 649         return 0;
 650 }
 651
 652 static inline bool
 653 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 654 {
 655         return false;
 656 }
 657
 658 static inline bool
 659 pnfs_ld_read_whole_page(struct inode *inode)
 660 {
 661         return false;
 662 }
 663
 664 static inline int
 665 pnfs_sync_inode(struct inode *inode, bool datasync)
 666 {
 667         return 0;
 668 }
 669
 670 static inline bool
 671 pnfs_layoutcommit_outstanding(struct inode *inode)
 672 {
 673         return false;
 674 }
 675
 676
 677 static inline bool
 678 pnfs_roc(struct inode *ino,
 679                 struct nfs4_layoutreturn_args *args,
 680                 struct nfs4_layoutreturn_res *res,
 681                 const struct rpc_cred *cred)
 682 {
 683         return false;
 684 }
 685
 686 static inline void
 687 pnfs_roc_release(struct nfs4_layoutreturn_args *args,
 688                 struct nfs4_layoutreturn_res *res,
 689                 int ret)
 690 {
 691 }
 692
 693 static inline bool
 694 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
 695 {
 696         return false;
 697 }
 698
 699 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 700                                          const struct nfs_fh *mntfh,
 701                                          struct nfs_fsinfo *fsinfo)
 702 {
 703 }
 704
 705 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 706 {
 707 }
 708
 709 static inline int
 710 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 711                  struct nfs_commit_info *cinfo)
 712 {
 713         return PNFS_NOT_ATTEMPTED;
 714 }
 715
 716 static inline struct pnfs_ds_commit_info *
 717 pnfs_get_ds_info(struct inode *inode)
 718 {
 719         return NULL;
 720 }
 721
 722 static inline bool
 723 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 724                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 725 {
 726         return false;
 727 }
 728
 729 static inline bool
 730 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 731 {
 732         return false;
 733 }
 734
 735 static inline int
 736 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 737                        int max)
 738 {
 739         return 0;
 740 }
 741
 742 static inline struct nfs_page *
 743 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 744                         struct page *page)
 745 {
 746         return NULL;
 747 }
 748
 749 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 750 {
 751         return 0;
 752 }
 753
 754 static inline bool
 755 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 756                    struct nfs_server *nfss)
 757 {
 758         return false;
 759 }
 760
 761 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 762 {
 763         return NULL;
 764 }
 765
 766 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 767 {
 768 }
 769
 770 static inline bool nfs4_refresh_layout_stateid(nfs4_stateid *dst,
 771                 struct inode *inode)
 772 {
 773         return false;
 774 }
 775 #endif /* CONFIG_NFS_V4_1 */
 776
 777 #if IS_ENABLED(CONFIG_NFS_V4_2)
 778 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
 779 #else
 780 static inline int
 781 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
 782 {
 783         return 0;
 784 }
 785 #endif
 786
 787 #endif /* FS_NFS_PNFS_H */