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 };
  42
  43 struct pnfs_layout_segment {
  44         struct list_head pls_list;
  45         struct list_head pls_lc_list;
  46         struct pnfs_layout_range pls_range;
  47         atomic_t pls_refcount;
  48         unsigned long pls_flags;
  49         struct pnfs_layout_hdr *pls_layout;
  50         struct work_struct pls_work;
  51 };
  52
  53 enum pnfs_try_status {
  54         PNFS_ATTEMPTED     = 0,
  55         PNFS_NOT_ATTEMPTED = 1,
  56 };
  57
  58 #ifdef CONFIG_NFS_V4_1
  59
  60 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
  61
  62 enum {
  63         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
  64         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
  65         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
  66         NFS_LAYOUT_ROC,                 /* some lseg had roc bit set */
  67         NFS_LAYOUT_RETURN,              /* Return this layout ASAP */
  68         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
  69 };
  70
  71 enum layoutdriver_policy_flags {
  72         /* Should the pNFS client commit and return the layout upon truncate to
  73          * a smaller size */
  74         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
  75         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
  76         PNFS_READ_WHOLE_PAGE            = 1 << 2,
  77 };
  78
  79 struct nfs4_deviceid_node;
  80
  81 /* Per-layout driver specific registration structure */
  82 struct pnfs_layoutdriver_type {
  83         struct list_head pnfs_tblid;
  84         const u32 id;
  85         const char *name;
  86         struct module *owner;
  87         unsigned flags;
  88         unsigned max_deviceinfo_size;
  89
  90         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
  91         int (*clear_layoutdriver) (struct nfs_server *);
  92
  93         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
  94         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
  95
  96         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
  97         void (*free_lseg) (struct pnfs_layout_segment *lseg);
  98
  99         void (*return_range) (struct pnfs_layout_hdr *lo,
 100                               struct pnfs_layout_range *range);
 101
 102         /* test for nfs page cache coalescing */
 103         const struct nfs_pageio_ops *pg_read_ops;
 104         const struct nfs_pageio_ops *pg_write_ops;
 105
 106         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
 107         void (*mark_request_commit) (struct nfs_page *req,
 108                                      struct pnfs_layout_segment *lseg,
 109                                      struct nfs_commit_info *cinfo);
 110         void (*clear_request_commit) (struct nfs_page *req,
 111                                       struct nfs_commit_info *cinfo);
 112         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 113                                   int max);
 114         void (*recover_commit_reqs) (struct list_head *list,
 115                                      struct nfs_commit_info *cinfo);
 116         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
 117                                                 struct page *page);
 118         int (*commit_pagelist)(struct inode *inode,
 119                                struct list_head *mds_pages,
 120                                int how,
 121                                struct nfs_commit_info *cinfo);
 122
 123         /*
 124          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 125          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 126          */
 127         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 128         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 129
 130         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 131         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 132                         (struct nfs_server *server, struct pnfs_device *pdev,
 133                         gfp_t gfp_flags);
 134
 135         void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
 136                                      struct xdr_stream *xdr,
 137                                      const struct nfs4_layoutreturn_args *args);
 138
 139         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 140         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
 141         void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
 142                                      struct xdr_stream *xdr,
 143                                      const struct nfs4_layoutcommit_args *args);
 144 };
 145
 146 struct pnfs_layout_hdr {
 147         atomic_t                plh_refcount;
 148         struct list_head        plh_layouts;   /* other client layouts */
 149         struct list_head        plh_bulk_destroy;
 150         struct list_head        plh_segs;      /* layout segments list */
 151         nfs4_stateid            plh_stateid;
 152         atomic_t                plh_outstanding; /* number of RPCs out */
 153         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 154         u32                     plh_barrier; /* ignore lower seqids */
 155         unsigned long           plh_retry_timestamp;
 156         unsigned long           plh_flags;
 157         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 158         struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
 159         struct inode            *plh_inode;
 160 };
 161
 162 struct pnfs_device {
 163         struct nfs4_deviceid dev_id;
 164         unsigned int  layout_type;
 165         unsigned int  mincount;
 166         unsigned int  maxcount; /* gdia_maxcount */
 167         struct page **pages;
 168         unsigned int  pgbase;
 169         unsigned int  pglen;    /* reply buffer length */
 170 };
 171
 172 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 173
 174 struct pnfs_devicelist {
 175         unsigned int            eof;
 176         unsigned int            num_devs;
 177         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 178 };
 179
 180 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 181 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 182
 183 /* nfs4proc.c */
 184 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 185                                    struct pnfs_device *dev,
 186                                    struct rpc_cred *cred);
 187 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
 188 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
 189
 190 /* pnfs.c */
 191 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 192 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 193 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
 194
 195 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
 196 void unset_pnfs_layoutdriver(struct nfs_server *);
 197 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 198 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 199 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 200                                 struct nfs_page *req, u64 wb_size);
 201 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 202 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 203                             struct nfs_page *prev, struct nfs_page *req);
 204 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 205 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 206 void pnfs_free_lseg_list(struct list_head *tmp_list);
 207 void pnfs_destroy_layout(struct nfs_inode *);
 208 void pnfs_destroy_all_layouts(struct nfs_client *);
 209 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 210                 struct nfs_fsid *fsid,
 211                 bool is_recall);
 212 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 213                 bool is_recall);
 214 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 215 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 216                              const nfs4_stateid *new,
 217                              bool update_barrier);
 218 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
 219                                   struct pnfs_layout_hdr *lo,
 220                                   struct nfs4_state *open_state);
 221 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 222                                 struct list_head *tmp_list,
 223                                 struct pnfs_layout_range *recall_range);
 224 bool pnfs_roc(struct inode *ino);
 225 void pnfs_roc_release(struct inode *ino);
 226 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
 227 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
 228 void pnfs_set_layoutcommit(struct nfs_pgio_header *);
 229 void pnfs_commit_set_layoutcommit(struct nfs_commit_data *data);
 230 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 231 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 232 int _pnfs_return_layout(struct inode *);
 233 int pnfs_commit_and_return_layout(struct inode *);
 234 void pnfs_ld_write_done(struct nfs_pgio_header *);
 235 void pnfs_ld_read_done(struct nfs_pgio_header *);
 236 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 237                                                struct nfs_open_context *ctx,
 238                                                loff_t pos,
 239                                                u64 count,
 240                                                enum pnfs_iomode iomode,
 241                                                gfp_t gfp_flags);
 242
 243 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 244 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 245 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 246 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 247
 248 /* nfs4_deviceid_flags */
 249 enum {
 250         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 251         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 252 };
 253
 254 /* pnfs_dev.c */
 255 struct nfs4_deviceid_node {
 256         struct hlist_node               node;
 257         struct hlist_node               tmpnode;
 258         const struct pnfs_layoutdriver_type *ld;
 259         const struct nfs_client         *nfs_client;
 260         unsigned long                   flags;
 261         unsigned long                   timestamp_unavailable;
 262         struct nfs4_deviceid            deviceid;
 263         atomic_t                        ref;
 264 };
 265
 266 struct nfs4_deviceid_node *
 267 nfs4_find_get_deviceid(struct nfs_server *server,
 268                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
 269                 gfp_t gfp_mask);
 270 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 271 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 272                              const struct nfs4_deviceid *);
 273 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 274 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 275 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 276 void nfs4_deviceid_purge_client(const struct nfs_client *);
 277
 278 static inline struct nfs4_deviceid_node *
 279 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 280 {
 281         atomic_inc(&d->ref);
 282         return d;
 283 }
 284
 285 static inline struct pnfs_layout_segment *
 286 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 287 {
 288         if (lseg) {
 289                 atomic_inc(&lseg->pls_refcount);
 290                 smp_mb__after_atomic();
 291         }
 292         return lseg;
 293 }
 294
 295 /* Return true if a layout driver is being used for this mountpoint */
 296 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 297 {
 298         return nfss->pnfs_curr_ld != NULL;
 299 }
 300
 301 static inline int
 302 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 303                  struct nfs_commit_info *cinfo)
 304 {
 305         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 306                 return PNFS_NOT_ATTEMPTED;
 307         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 308 }
 309
 310 static inline struct pnfs_ds_commit_info *
 311 pnfs_get_ds_info(struct inode *inode)
 312 {
 313         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 314
 315         if (ld == NULL || ld->get_ds_info == NULL)
 316                 return NULL;
 317         return ld->get_ds_info(inode);
 318 }
 319
 320 static inline bool
 321 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 322                          struct nfs_commit_info *cinfo)
 323 {
 324         struct inode *inode = req->wb_context->dentry->d_inode;
 325         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 326
 327         if (lseg == NULL || ld->mark_request_commit == NULL)
 328                 return false;
 329         ld->mark_request_commit(req, lseg, cinfo);
 330         return true;
 331 }
 332
 333 static inline bool
 334 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 335 {
 336         struct inode *inode = req->wb_context->dentry->d_inode;
 337         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 338
 339         if (ld == NULL || ld->clear_request_commit == NULL)
 340                 return false;
 341         ld->clear_request_commit(req, cinfo);
 342         return true;
 343 }
 344
 345 static inline int
 346 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 347                        int max)
 348 {
 349         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 350                 return 0;
 351         else
 352                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 353 }
 354
 355 static inline void
 356 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
 357                          struct nfs_commit_info *cinfo)
 358 {
 359         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 360                 return;
 361         NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
 362 }
 363
 364 static inline struct nfs_page *
 365 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 366                         struct page *page)
 367 {
 368         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 369
 370         if (ld == NULL || ld->search_commit_reqs == NULL)
 371                 return NULL;
 372         return ld->search_commit_reqs(cinfo, page);
 373 }
 374
 375 /* Should the pNFS client commit and return the layout upon a setattr */
 376 static inline bool
 377 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 378 {
 379         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 380                 return false;
 381         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 382                 PNFS_LAYOUTRET_ON_SETATTR;
 383 }
 384
 385 static inline bool
 386 pnfs_ld_read_whole_page(struct inode *inode)
 387 {
 388         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 389                 return false;
 390         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
 391 }
 392
 393 static inline bool
 394 pnfs_layoutcommit_outstanding(struct inode *inode)
 395 {
 396         struct nfs_inode *nfsi = NFS_I(inode);
 397
 398         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
 399                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
 400 }
 401
 402 static inline int pnfs_return_layout(struct inode *ino)
 403 {
 404         struct nfs_inode *nfsi = NFS_I(ino);
 405         struct nfs_server *nfss = NFS_SERVER(ino);
 406
 407         if (pnfs_enabled_sb(nfss) && nfsi->layout)
 408                 return _pnfs_return_layout(ino);
 409
 410         return 0;
 411 }
 412
 413 static inline bool
 414 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 415                    struct nfs_server *nfss)
 416 {
 417         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 418                                         nfss->pnfs_curr_ld->id == src->l_type);
 419 }
 420
 421 #ifdef NFS_DEBUG
 422 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 423 #else
 424 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 425 {
 426 }
 427 #endif /* NFS_DEBUG */
 428 #else  /* CONFIG_NFS_V4_1 */
 429
 430 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 431 {
 432 }
 433
 434 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 435 {
 436 }
 437
 438 static inline struct pnfs_layout_segment *
 439 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 440 {
 441         return NULL;
 442 }
 443
 444 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 445 {
 446 }
 447
 448 static inline int pnfs_return_layout(struct inode *ino)
 449 {
 450         return 0;
 451 }
 452
 453 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 454 {
 455         return 0;
 456 }
 457
 458 static inline bool
 459 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 460 {
 461         return false;
 462 }
 463
 464 static inline bool
 465 pnfs_ld_read_whole_page(struct inode *inode)
 466 {
 467         return false;
 468 }
 469
 470 static inline bool
 471 pnfs_roc(struct inode *ino)
 472 {
 473         return false;
 474 }
 475
 476 static inline void
 477 pnfs_roc_release(struct inode *ino)
 478 {
 479 }
 480
 481 static inline void
 482 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 483 {
 484 }
 485
 486 static inline bool
 487 pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
 488 {
 489         return false;
 490 }
 491
 492 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 493                                          const struct nfs_fh *mntfh, u32 id)
 494 {
 495 }
 496
 497 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 498 {
 499 }
 500
 501 static inline int
 502 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 503                  struct nfs_commit_info *cinfo)
 504 {
 505         return PNFS_NOT_ATTEMPTED;
 506 }
 507
 508 static inline struct pnfs_ds_commit_info *
 509 pnfs_get_ds_info(struct inode *inode)
 510 {
 511         return NULL;
 512 }
 513
 514 static inline bool
 515 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 516                          struct nfs_commit_info *cinfo)
 517 {
 518         return false;
 519 }
 520
 521 static inline bool
 522 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 523 {
 524         return false;
 525 }
 526
 527 static inline int
 528 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 529                        int max)
 530 {
 531         return 0;
 532 }
 533
 534 static inline void
 535 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
 536                          struct nfs_commit_info *cinfo)
 537 {
 538 }
 539
 540 static inline struct nfs_page *
 541 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 542                         struct page *page)
 543 {
 544         return NULL;
 545 }
 546
 547 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 548 {
 549         return 0;
 550 }
 551
 552 static inline bool
 553 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 554                    struct nfs_server *nfss)
 555 {
 556         return false;
 557 }
 558
 559 static inline bool
 560 pnfs_layoutcommit_outstanding(struct inode *inode)
 561 {
 562         return false;
 563 }
 564
 565
 566 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 567 {
 568         return NULL;
 569 }
 570
 571 #endif /* CONFIG_NFS_V4_1 */
 572
 573 #endif /* FS_NFS_PNFS_H */