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_RETURN,              /* Return this layout ASAP */
  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 *pgio,
 191                                 struct nfs_page *req, u64 wb_size);
 192 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 193 bool pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, struct nfs_page *req);
 194 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 195 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 196 void pnfs_free_lseg_list(struct list_head *tmp_list);
 197 void pnfs_destroy_layout(struct nfs_inode *);
 198 void pnfs_destroy_all_layouts(struct nfs_client *);
 199 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 200 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 201                              const nfs4_stateid *new,
 202                              bool update_barrier);
 203 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
 204                                   struct pnfs_layout_hdr *lo,
 205                                   struct nfs4_state *open_state);
 206 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 207                                 struct list_head *tmp_list,
 208                                 struct pnfs_layout_range *recall_range);
 209 bool pnfs_roc(struct inode *ino);
 210 void pnfs_roc_release(struct inode *ino);
 211 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
 212 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task);
 213 void pnfs_set_layoutcommit(struct nfs_write_data *wdata);
 214 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 215 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 216 int _pnfs_return_layout(struct inode *);
 217 void pnfs_ld_write_done(struct nfs_write_data *);
 218 void pnfs_ld_read_done(struct nfs_read_data *);
 219 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 220                                                struct nfs_open_context *ctx,
 221                                                loff_t pos,
 222                                                u64 count,
 223                                                enum pnfs_iomode iomode,
 224                                                gfp_t gfp_flags);
 225
 226 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 227 int pnfs_read_done_resend_to_mds(struct inode *inode, struct list_head *head,
 228                         const struct nfs_pgio_completion_ops *compl_ops);
 229 int pnfs_write_done_resend_to_mds(struct inode *inode, struct list_head *head,
 230                         const struct nfs_pgio_completion_ops *compl_ops);
 231 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 232
 233 /* nfs4_deviceid_flags */
 234 enum {
 235         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 236         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 237 };
 238
 239 /* pnfs_dev.c */
 240 struct nfs4_deviceid_node {
 241         struct hlist_node               node;
 242         struct hlist_node               tmpnode;
 243         const struct pnfs_layoutdriver_type *ld;
 244         const struct nfs_client         *nfs_client;
 245         unsigned long                   flags;
 246         unsigned long                   timestamp_unavailable;
 247         struct nfs4_deviceid            deviceid;
 248         atomic_t                        ref;
 249 };
 250
 251 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 252 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 253 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
 254                              const struct pnfs_layoutdriver_type *,
 255                              const struct nfs_client *,
 256                              const struct nfs4_deviceid *);
 257 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
 258 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 259 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 260 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 261 void nfs4_deviceid_purge_client(const struct nfs_client *);
 262
 263 static inline struct pnfs_layout_segment *
 264 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 265 {
 266         if (lseg) {
 267                 atomic_inc(&lseg->pls_refcount);
 268                 smp_mb__after_atomic_inc();
 269         }
 270         return lseg;
 271 }
 272
 273 /* Return true if a layout driver is being used for this mountpoint */
 274 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 275 {
 276         return nfss->pnfs_curr_ld != NULL;
 277 }
 278
 279 static inline int
 280 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 281                  struct nfs_commit_info *cinfo)
 282 {
 283         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 284                 return PNFS_NOT_ATTEMPTED;
 285         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 286 }
 287
 288 static inline struct pnfs_ds_commit_info *
 289 pnfs_get_ds_info(struct inode *inode)
 290 {
 291         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 292
 293         if (ld == NULL || ld->get_ds_info == NULL)
 294                 return NULL;
 295         return ld->get_ds_info(inode);
 296 }
 297
 298 static inline bool
 299 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 300                          struct nfs_commit_info *cinfo)
 301 {
 302         struct inode *inode = req->wb_context->dentry->d_inode;
 303         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 304
 305         if (lseg == NULL || ld->mark_request_commit == NULL)
 306                 return false;
 307         ld->mark_request_commit(req, lseg, cinfo);
 308         return true;
 309 }
 310
 311 static inline bool
 312 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 313 {
 314         struct inode *inode = req->wb_context->dentry->d_inode;
 315         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 316
 317         if (ld == NULL || ld->clear_request_commit == NULL)
 318                 return false;
 319         ld->clear_request_commit(req, cinfo);
 320         return true;
 321 }
 322
 323 static inline int
 324 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 325                        int max)
 326 {
 327         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 328                 return 0;
 329         else
 330                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 331 }
 332
 333 static inline void
 334 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
 335                          struct nfs_commit_info *cinfo)
 336 {
 337         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 338                 return;
 339         NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
 340 }
 341
 342 /* Should the pNFS client commit and return the layout upon a setattr */
 343 static inline bool
 344 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 345 {
 346         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 347                 return false;
 348         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 349                 PNFS_LAYOUTRET_ON_SETATTR;
 350 }
 351
 352 static inline int pnfs_return_layout(struct inode *ino)
 353 {
 354         struct nfs_inode *nfsi = NFS_I(ino);
 355         struct nfs_server *nfss = NFS_SERVER(ino);
 356
 357         if (pnfs_enabled_sb(nfss) && nfsi->layout)
 358                 return _pnfs_return_layout(ino);
 359
 360         return 0;
 361 }
 362
 363 static inline bool
 364 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 365                    struct nfs_server *nfss)
 366 {
 367         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 368                                         nfss->pnfs_curr_ld->id == src->l_type);
 369 }
 370
 371 #ifdef NFS_DEBUG
 372 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 373 #else
 374 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 375 {
 376 }
 377 #endif /* NFS_DEBUG */
 378 #else  /* CONFIG_NFS_V4_1 */
 379
 380 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 381 {
 382 }
 383
 384 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 385 {
 386 }
 387
 388 static inline struct pnfs_layout_segment *
 389 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 390 {
 391         return NULL;
 392 }
 393
 394 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 395 {
 396 }
 397
 398 static inline int pnfs_return_layout(struct inode *ino)
 399 {
 400         return 0;
 401 }
 402
 403 static inline bool
 404 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 405 {
 406         return false;
 407 }
 408
 409 static inline bool
 410 pnfs_roc(struct inode *ino)
 411 {
 412         return false;
 413 }
 414
 415 static inline void
 416 pnfs_roc_release(struct inode *ino)
 417 {
 418 }
 419
 420 static inline void
 421 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 422 {
 423 }
 424
 425 static inline bool
 426 pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task)
 427 {
 428         return false;
 429 }
 430
 431 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 432                                          const struct nfs_fh *mntfh, u32 id)
 433 {
 434 }
 435
 436 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 437 {
 438 }
 439
 440 static inline void pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
 441                                          const struct nfs_pgio_completion_ops *compl_ops)
 442 {
 443         nfs_pageio_init_read(pgio, inode, compl_ops);
 444 }
 445
 446 static inline void pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags,
 447                                           const struct nfs_pgio_completion_ops *compl_ops)
 448 {
 449         nfs_pageio_init_write(pgio, inode, ioflags, compl_ops);
 450 }
 451
 452 static inline int
 453 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 454                  struct nfs_commit_info *cinfo)
 455 {
 456         return PNFS_NOT_ATTEMPTED;
 457 }
 458
 459 static inline struct pnfs_ds_commit_info *
 460 pnfs_get_ds_info(struct inode *inode)
 461 {
 462         return NULL;
 463 }
 464
 465 static inline bool
 466 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 467                          struct nfs_commit_info *cinfo)
 468 {
 469         return false;
 470 }
 471
 472 static inline bool
 473 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 474 {
 475         return false;
 476 }
 477
 478 static inline int
 479 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 480                        int max)
 481 {
 482         return 0;
 483 }
 484
 485 static inline void
 486 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
 487                          struct nfs_commit_info *cinfo)
 488 {
 489 }
 490
 491 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 492 {
 493         return 0;
 494 }
 495
 496 static inline bool
 497 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 498                    struct nfs_server *nfss)
 499 {
 500         return false;
 501 }
 502
 503 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 504 {
 505         return NULL;
 506 }
 507
 508 #endif /* CONFIG_NFS_V4_1 */
 509
 510 #endif /* FS_NFS_PNFS_H */