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_DESTROYED,           /* no new use of layout allowed */
  66         NFS_LAYOUT_INVALID,             /* layout is being destroyed */
  67 };
  68
  69 enum layoutdriver_policy_flags {
  70         /* Should the pNFS client commit and return the layout upon a setattr */
  71         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
  72         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
  73 };
  74
  75 struct nfs4_deviceid_node;
  76
  77 /* Per-layout driver specific registration structure */
  78 struct pnfs_layoutdriver_type {
  79         struct list_head pnfs_tblid;
  80         const u32 id;
  81         const char *name;
  82         struct module *owner;
  83         unsigned flags;
  84
  85         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
  86         int (*clear_layoutdriver) (struct nfs_server *);
  87
  88         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
  89         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
  90
  91         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
  92         void (*free_lseg) (struct pnfs_layout_segment *lseg);
  93
  94         /* test for nfs page cache coalescing */
  95         const struct nfs_pageio_ops *pg_read_ops;
  96         const struct nfs_pageio_ops *pg_write_ops;
  97
  98         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
  99         void (*mark_request_commit) (struct nfs_page *req,
 100                                      struct pnfs_layout_segment *lseg,
 101                                      struct nfs_commit_info *cinfo);
 102         void (*clear_request_commit) (struct nfs_page *req,
 103                                       struct nfs_commit_info *cinfo);
 104         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 105                                   int max);
 106         void (*recover_commit_reqs) (struct list_head *list,
 107                                      struct nfs_commit_info *cinfo);
 108         int (*commit_pagelist)(struct inode *inode,
 109                                struct list_head *mds_pages,
 110                                int how,
 111                                struct nfs_commit_info *cinfo);
 112
 113         /*
 114          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 115          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 116          */
 117         enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
 118         enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
 119
 120         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 121
 122         void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
 123                                      struct xdr_stream *xdr,
 124                                      const struct nfs4_layoutreturn_args *args);
 125
 126         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 127
 128         void (*encode_layoutcommit) (struct pnfs_layout_hdr *layoutid,
 129                                      struct xdr_stream *xdr,
 130                                      const struct nfs4_layoutcommit_args *args);
 131 };
 132
 133 struct pnfs_layout_hdr {
 134         atomic_t                plh_refcount;
 135         struct list_head        plh_layouts;   /* other client layouts */
 136         struct list_head        plh_bulk_recall; /* clnt list of bulk recalls */
 137         struct list_head        plh_segs;      /* layout segments list */
 138         nfs4_stateid            plh_stateid;
 139         atomic_t                plh_outstanding; /* number of RPCs out */
 140         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 141         u32                     plh_barrier; /* ignore lower seqids */
 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 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
 175 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
 176
 177 /* pnfs.c */
 178 void get_layout_hdr(struct pnfs_layout_hdr *lo);
 179 void put_lseg(struct pnfs_layout_segment *lseg);
 180
 181 bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *,
 182                            const struct nfs_pgio_completion_ops *);
 183 bool 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 int 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 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 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);
 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 };
 236
 237 /* pnfs_dev.c */
 238 struct nfs4_deviceid_node {
 239         struct hlist_node               node;
 240         struct hlist_node               tmpnode;
 241         const struct pnfs_layoutdriver_type *ld;
 242         const struct nfs_client         *nfs_client;
 243         unsigned long                   flags;
 244         struct nfs4_deviceid            deviceid;
 245         atomic_t                        ref;
 246 };
 247
 248 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 249 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 250 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
 251                              const struct pnfs_layoutdriver_type *,
 252                              const struct nfs_client *,
 253                              const struct nfs4_deviceid *);
 254 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
 255 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 256 void nfs4_deviceid_purge_client(const struct nfs_client *);
 257
 258 static inline int lo_fail_bit(u32 iomode)
 259 {
 260         return iomode == IOMODE_RW ?
 261                          NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED;
 262 }
 263
 264 static inline struct pnfs_layout_segment *
 265 get_lseg(struct pnfs_layout_segment *lseg)
 266 {
 267         if (lseg) {
 268                 atomic_inc(&lseg->pls_refcount);
 269                 smp_mb__after_atomic_inc();
 270         }
 271         return lseg;
 272 }
 273
 274 /* Return true if a layout driver is being used for this mountpoint */
 275 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 276 {
 277         return nfss->pnfs_curr_ld != NULL;
 278 }
 279
 280 static inline int
 281 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 282                  struct nfs_commit_info *cinfo)
 283 {
 284         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 285                 return PNFS_NOT_ATTEMPTED;
 286         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 287 }
 288
 289 static inline struct pnfs_ds_commit_info *
 290 pnfs_get_ds_info(struct inode *inode)
 291 {
 292         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 293
 294         if (ld == NULL || ld->get_ds_info == NULL)
 295                 return NULL;
 296         return ld->get_ds_info(inode);
 297 }
 298
 299 static inline bool
 300 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 301                          struct nfs_commit_info *cinfo)
 302 {
 303         struct inode *inode = req->wb_context->dentry->d_inode;
 304         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 305
 306         if (lseg == NULL || ld->mark_request_commit == NULL)
 307                 return false;
 308         ld->mark_request_commit(req, lseg, cinfo);
 309         return true;
 310 }
 311
 312 static inline bool
 313 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 314 {
 315         struct inode *inode = req->wb_context->dentry->d_inode;
 316         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 317
 318         if (ld == NULL || ld->clear_request_commit == NULL)
 319                 return false;
 320         ld->clear_request_commit(req, cinfo);
 321         return true;
 322 }
 323
 324 static inline int
 325 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 326                        int max)
 327 {
 328         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 329                 return 0;
 330         else
 331                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 332 }
 333
 334 static inline void
 335 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
 336                          struct nfs_commit_info *cinfo)
 337 {
 338         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 339                 return;
 340         NFS_SERVER(inode)->pnfs_curr_ld->recover_commit_reqs(list, cinfo);
 341 }
 342
 343 /* Should the pNFS client commit and return the layout upon a setattr */
 344 static inline bool
 345 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 346 {
 347         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 348                 return false;
 349         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 350                 PNFS_LAYOUTRET_ON_SETATTR;
 351 }
 352
 353 static inline int pnfs_return_layout(struct inode *ino)
 354 {
 355         struct nfs_inode *nfsi = NFS_I(ino);
 356         struct nfs_server *nfss = NFS_SERVER(ino);
 357
 358         if (pnfs_enabled_sb(nfss) && nfsi->layout)
 359                 return _pnfs_return_layout(ino);
 360
 361         return 0;
 362 }
 363
 364 static inline bool
 365 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 366                    struct nfs_server *nfss)
 367 {
 368         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 369                                         nfss->pnfs_curr_ld->id == src->l_type);
 370 }
 371
 372 #ifdef NFS_DEBUG
 373 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 374 #else
 375 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 376 {
 377 }
 378 #endif /* NFS_DEBUG */
 379 #else  /* CONFIG_NFS_V4_1 */
 380
 381 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 382 {
 383 }
 384
 385 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 386 {
 387 }
 388
 389 static inline struct pnfs_layout_segment *
 390 get_lseg(struct pnfs_layout_segment *lseg)
 391 {
 392         return NULL;
 393 }
 394
 395 static inline void put_lseg(struct pnfs_layout_segment *lseg)
 396 {
 397 }
 398
 399 static inline int pnfs_return_layout(struct inode *ino)
 400 {
 401         return 0;
 402 }
 403
 404 static inline bool
 405 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 406 {
 407         return false;
 408 }
 409
 410 static inline bool
 411 pnfs_roc(struct inode *ino)
 412 {
 413         return false;
 414 }
 415
 416 static inline void
 417 pnfs_roc_release(struct inode *ino)
 418 {
 419 }
 420
 421 static inline void
 422 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 423 {
 424 }
 425
 426 static inline bool
 427 pnfs_roc_drain(struct inode *ino, u32 *barrier)
 428 {
 429         return false;
 430 }
 431
 432 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 433                                          const struct nfs_fh *mntfh, u32 id)
 434 {
 435 }
 436
 437 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 438 {
 439 }
 440
 441 static inline bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode,
 442                                          const struct nfs_pgio_completion_ops *compl_ops)
 443 {
 444         return false;
 445 }
 446
 447 static inline bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags,
 448                                           const struct nfs_pgio_completion_ops *compl_ops)
 449 {
 450         return false;
 451 }
 452
 453 static inline int
 454 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 455                  struct nfs_commit_info *cinfo)
 456 {
 457         return PNFS_NOT_ATTEMPTED;
 458 }
 459
 460 static inline struct pnfs_ds_commit_info *
 461 pnfs_get_ds_info(struct inode *inode)
 462 {
 463         return NULL;
 464 }
 465
 466 static inline bool
 467 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 468                          struct nfs_commit_info *cinfo)
 469 {
 470         return false;
 471 }
 472
 473 static inline bool
 474 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 475 {
 476         return false;
 477 }
 478
 479 static inline int
 480 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 481                        int max)
 482 {
 483         return 0;
 484 }
 485
 486 static inline void
 487 pnfs_recover_commit_reqs(struct inode *inode, struct list_head *list,
 488                          struct nfs_commit_info *cinfo)
 489 {
 490 }
 491
 492 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 493 {
 494         return 0;
 495 }
 496
 497 static inline bool
 498 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 499                    struct nfs_server *nfss)
 500 {
 501         return false;
 502 }
 503
 504 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 505 {
 506         return NULL;
 507 }
 508
 509 #endif /* CONFIG_NFS_V4_1 */
 510
 511 #endif /* FS_NFS_PNFS_H */