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
  36 enum {
  37         NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
  38         NFS_LSEG_ROC,           /* roc bit received from server */
  39         NFS_LSEG_LAYOUTCOMMIT,  /* layoutcommit bit set for layoutcommit */
  40 };
  41
  42 struct pnfs_layout_segment {
  43         struct list_head pls_list;
  44         struct list_head pls_lc_list;
  45         struct pnfs_layout_range pls_range;
  46         atomic_t pls_refcount;
  47         unsigned long pls_flags;
  48         struct pnfs_layout_hdr *pls_layout;
  49 };
  50
  51 enum pnfs_try_status {
  52         PNFS_ATTEMPTED     = 0,
  53         PNFS_NOT_ATTEMPTED = 1,
  54 };
  55
  56 #ifdef CONFIG_NFS_V4_1
  57
  58 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
  59
  60 enum {
  61         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
  62         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
  63         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
  64         NFS_LAYOUT_ROC,                 /* some lseg had roc bit set */
  65         NFS_LAYOUT_RETURNED,            /* layout has already been returned */
  66 };
  67
  68 enum layoutdriver_policy_flags {
  69         /* Should the pNFS client commit and return the layout upon a setattr */
  70         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
  71         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
  72 };
  73
  74 struct nfs4_deviceid_node;
  75
  76 /* Per-layout driver specific registration structure */
  77 struct pnfs_layoutdriver_type {
  78         struct list_head pnfs_tblid;
  79         const u32 id;
  80         const char *name;
  81         struct module *owner;
  82         unsigned flags;
  83
  84         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
  85         int (*clear_layoutdriver) (struct nfs_server *);
  86
  87         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
  88         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
  89
  90         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
  91         void (*free_lseg) (struct pnfs_layout_segment *lseg);
  92
  93         /* test for nfs page cache coalescing */
  94         const struct nfs_pageio_ops *pg_read_ops;
  95         const struct nfs_pageio_ops *pg_write_ops;
  96
  97         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
  98         void (*mark_request_commit) (struct nfs_page *req,
  99                                      struct pnfs_layout_segment *lseg,
 100                                      struct nfs_commit_info *cinfo);
 101         void (*clear_request_commit) (struct nfs_page *req,
 102                                       struct nfs_commit_info *cinfo);
 103         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 104                                   int max);
 105         void (*recover_commit_reqs) (struct list_head *list,
 106                                      struct nfs_commit_info *cinfo);
 107         int (*commit_pagelist)(struct inode *inode,
 108                                struct list_head *mds_pages,
 109                                int how,
 110                                struct nfs_commit_info *cinfo);
 111
 112         /*
 113          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 114          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 115          */
 116         enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
 117         enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
 118
 119         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 120
 121         void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
 122                                      struct xdr_stream *xdr,
 123                                      const struct nfs4_layoutreturn_args *args);
 124
 125         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 126
 127         void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
 128                                      struct xdr_stream *xdr,
 129                                      const struct nfs4_layoutcommit_args *args);
 130 };
 131
 132 struct pnfs_layout_hdr {
 133         atomic_t                plh_refcount;
 134         struct list_head        plh_layouts;   /* other client layouts */
 135         struct list_head        plh_bulk_recall; /* clnt list of bulk recalls */
 136         struct list_head        plh_segs;      /* layout segments list */
 137         nfs4_stateid            plh_stateid;
 138         atomic_t                plh_outstanding; /* number of RPCs out */
 139         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 140         u32                     plh_barrier; /* ignore lower seqids */
 141         unsigned long           plh_retry_timestamp;
 142         unsigned long           plh_flags;
 143         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 144         struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
 145         struct inode            *plh_inode;
 146 };
 147
 148 struct pnfs_device {
 149         struct nfs4_deviceid dev_id;
 150         unsigned int  layout_type;
 151         unsigned int  mincount;
 152         struct page **pages;
 153         unsigned int  pgbase;
 154         unsigned int  pglen;
 155 };
 156
 157 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 158
 159 struct pnfs_devicelist {
 160         unsigned int            eof;
 161         unsigned int            num_devs;
 162         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 163 };
 164
 165 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 166 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 167
 168 /* nfs4proc.c */
 169 extern int nfs4_proc_getdevicelist(struct nfs_server *server,
 170                                    const struct nfs_fh *fh,
 171                                    struct pnfs_devicelist *devlist);
 172 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 173                                    struct pnfs_device *dev);
 174 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
 175 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
 176
 177 /* pnfs.c */
 178 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 179 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 180
 181 void pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *,
 182                            const struct nfs_pgio_completion_ops *);
 183 void pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *,
 184                             int, const struct nfs_pgio_completion_ops *);
 185
 186 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
 187 void unset_pnfs_layoutdriver(struct nfs_server *);
 188 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 189 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 190 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *, struct nfs_page *);
 191 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 192 bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
 193 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 194 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 195 void pnfs_free_lseg_list(struct list_head *tmp_list);
 196 void pnfs_destroy_layout(struct nfs_inode *);
 197 void pnfs_destroy_all_layouts(struct nfs_client *);
 198 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 199 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 200                              const nfs4_stateid *new,
 201                              bool update_barrier);
 202 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
 203                                   struct pnfs_layout_hdr *lo,
 204                                   struct nfs4_state *open_state);
 205 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 206                                 struct list_head *tmp_list,
 207                                 struct pnfs_layout_range *recall_range);
 208 bool pnfs_roc(struct inode *ino);
 209 void pnfs_roc_release(struct inode *ino);
 210 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
 211 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
 212 void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
 213 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 214 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 215 int _pnfs_return_layout(struct inode *);
 216 void pnfs_ld_write_done(struct nfs_write_data *);
 217 void pnfs_ld_read_done(struct nfs_read_data *);
 218 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 219                                                struct nfs_open_context *ctx,
 220                                                loff_t pos,
 221                                                u64 count,
 222                                                enum pnfs_iomode iomode,
 223                                                gfp_t gfp_flags);
 224
 225 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 226 int pnfs_read_done_resend_to_mds(struct inode *inode, struct list_head *head,
 227                         const struct nfs_pgio_completion_ops *compl_ops);
 228 int pnfs_write_done_resend_to_mds(struct inode *inode, struct list_head *head,
 229                         const struct nfs_pgio_completion_ops *compl_ops);
 230 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 231
 232 /* nfs4_deviceid_flags */
 233 enum {
 234         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 235         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 236 };
 237
 238 /* pnfs_dev.c */
 239 struct nfs4_deviceid_node {
 240         struct hlist_node               node;
 241         struct hlist_node               tmpnode;
 242         const struct pnfs_layoutdriver_type *ld;
 243         const struct nfs_client         *nfs_client;
 244         unsigned long                   flags;
 245         unsigned long                   timestamp_unavailable;
 246         struct nfs4_deviceid            deviceid;
 247         atomic_t                        ref;
 248 };
 249
 250 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 251 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 252 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
 253                              const struct pnfs_layoutdriver_type *,
 254                              const struct nfs_client *,
 255                              const struct nfs4_deviceid *);
 256 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
 257 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 258 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 259 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 260 void nfs4_deviceid_purge_client(const struct nfs_client *);
 261
 262 static inline void
 263 pnfs_mark_layout_returned(struct pnfs_layout_hdr *lo)
 264 {
 265         set_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags);
 266 }
 267
 268 static inline void
 269 pnfs_clear_layout_returned(struct pnfs_layout_hdr *lo)
 270 {
 271         clear_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags);
 272 }
 273
 274 static inline bool
 275 pnfs_test_layout_returned(struct pnfs_layout_hdr *lo)
 276 {
 277         return test_bit(NFS_LAYOUT_RETURNED, &lo->plh_flags);
 278 }
 279
 280 static inline struct pnfs_layout_segment *
 281 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 282 {
 283         if (lseg) {
 284                 atomic_inc(&lseg->pls_refcount);
 285                 smp_mb__after_atomic_inc();
 286         }
 287         return lseg;
 288 }
 289
 290 /* Return true if a layout driver is being used for this mountpoint */
 291 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 292 {
 293         return nfss->pnfs_curr_ld != NULL;
 294 }
 295
 296 static inline int
 297 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 298                  struct nfs_commit_info *cinfo)
 299 {
 300         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 301                 return PNFS_NOT_ATTEMPTED;
 302         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 303 }
 304
 305 static inline struct pnfs_ds_commit_info *
 306 pnfs_get_ds_info(struct inode *inode)
 307 {
 308         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 309
 310         if (ld == NULL || ld->get_ds_info == NULL)
 311                 return NULL;
 312         return ld->get_ds_info(inode);
 313 }
 314
 315 static inline bool
 316 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 317                          struct nfs_commit_info *cinfo)
 318 {
 319         struct inode *inode = req->wb_context->dentry->d_inode;
 320         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 321
 322         if (lseg == NULL || ld->mark_request_commit == NULL)
 323                 return false;
 324         ld->mark_request_commit(req, lseg, cinfo);
 325         return true;
 326 }
 327
 328 static inline bool
 329 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 330 {
 331         struct inode *inode = req->wb_context->dentry->d_inode;
 332         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 333
 334         if (ld == NULL || ld->clear_request_commit == NULL)
 335                 return false;
 336         ld->clear_request_commit(req, cinfo);
 337         return true;
 338 }
 339
 340 static inline int
 341 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 342                        int max)
 343 {
 344         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 345                 return 0;
 346         else
 347                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 348 }
 349
 350 static inline void
 351 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
 352                          struct nfs_commit_info *cinfo)
 353 {
 354         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 355                 return;
 356         NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
 357 }
 358
 359 /* Should the pNFS client commit and return the layout upon a setattr */
 360 static inline bool
 361 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 362 {
 363         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 364                 return false;
 365         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 366                 PNFS_LAYOUTRET_ON_SETATTR;
 367 }
 368
 369 static inline int pnfs_return_layout(struct inode *ino)
 370 {
 371         struct nfs_inode *nfsi = NFS_I(ino);
 372         struct nfs_server *nfss = NFS_SERVER(ino);
 373
 374         if (pnfs_enabled_sb(nfss) && nfsi->layout)
 375                 return _pnfs_return_layout(ino);
 376
 377         return 0;
 378 }
 379
 380 static inline bool
 381 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 382                    struct nfs_server *nfss)
 383 {
 384         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 385                                         nfss->pnfs_curr_ld->id == src->l_type);
 386 }
 387
 388 #ifdef NFS_DEBUG
 389 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 390 #else
 391 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 392 {
 393 }
 394 #endif /* NFS_DEBUG */
 395 #else  /* CONFIG_NFS_V4_1 */
 396
 397 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 398 {
 399 }
 400
 401 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 402 {
 403 }
 404
 405 static inline struct pnfs_layout_segment *
 406 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 407 {
 408         return NULL;
 409 }
 410
 411 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 412 {
 413 }
 414
 415 static inline int pnfs_return_layout(struct inode *ino)
 416 {
 417         return 0;
 418 }
 419
 420 static inline bool
 421 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 422 {
 423         return false;
 424 }
 425
 426 static inline bool
 427 pnfs_roc(struct inode *ino)
 428 {
 429         return false;
 430 }
 431
 432 static inline void
 433 pnfs_roc_release(struct inode *ino)
 434 {
 435 }
 436
 437 static inline void
 438 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 439 {
 440 }
 441
 442 static inline bool
 443 pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
 444 {
 445         return false;
 446 }
 447
 448 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 449                                          const struct nfs_fh *mntfh, u32 id)
 450 {
 451 }
 452
 453 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 454 {
 455 }
 456
 457 static inline void pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
 458                                          const struct nfs_pgio_completion_ops *compl_ops)
 459 {
 460         nfs_pageio_init_read(pgio, inode, compl_ops);
 461 }
 462
 463 static inline void pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags,
 464                                           const struct nfs_pgio_completion_ops *compl_ops)
 465 {
 466         nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
 467 }
 468
 469 static inline int
 470 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 471                  struct nfs_commit_info *cinfo)
 472 {
 473         return PNFS_NOT_ATTEMPTED;
 474 }
 475
 476 static inline struct pnfs_ds_commit_info *
 477 pnfs_get_ds_info(struct inode *inode)
 478 {
 479         return NULL;
 480 }
 481
 482 static inline bool
 483 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 484                          struct nfs_commit_info *cinfo)
 485 {
 486         return false;
 487 }
 488
 489 static inline bool
 490 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 491 {
 492         return false;
 493 }
 494
 495 static inline int
 496 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 497                        int max)
 498 {
 499         return 0;
 500 }
 501
 502 static inline void
 503 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
 504                          struct nfs_commit_info *cinfo)
 505 {
 506 }
 507
 508 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 509 {
 510         return 0;
 511 }
 512
 513 static inline bool
 514 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 515                    struct nfs_server *nfss)
 516 {
 517         return false;
 518 }
 519
 520 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 521 {
 522         return NULL;
 523 }
 524
 525 #endif /* CONFIG_NFS_V4_1 */
 526
 527 #endif /* FS_NFS_PNFS_H */