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 struct nfs4_opendata;
  39
  40 enum {
  41         NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
  42         NFS_LSEG_ROC,           /* roc bit received from server */
  43         NFS_LSEG_LAYOUTCOMMIT,  /* layoutcommit bit set for layoutcommit */
  44         NFS_LSEG_LAYOUTRETURN,  /* layoutreturn bit set for layoutreturn */
  45         NFS_LSEG_UNAVAILABLE,   /* unavailable bit set for temporary problem */
  46 };
  47
  48 /* Individual ip address */
  49 struct nfs4_pnfs_ds_addr {
  50         struct sockaddr_storage da_addr;
  51         size_t                  da_addrlen;
  52         struct list_head        da_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  53         char                    *da_remotestr;  /* human readable addr+port */
  54 };
  55
  56 struct nfs4_pnfs_ds {
  57         struct list_head        ds_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  58         char                    *ds_remotestr;  /* comma sep list of addrs */
  59         struct list_head        ds_addrs;
  60         struct nfs_client       *ds_clp;
  61         refcount_t              ds_count;
  62         unsigned long           ds_state;
  63 #define NFS4DS_CONNECTING       0       /* ds is establishing connection */
  64 };
  65
  66 struct pnfs_layout_segment {
  67         struct list_head pls_list;
  68         struct list_head pls_lc_list;
  69         struct pnfs_layout_range pls_range;
  70         refcount_t pls_refcount;
  71         u32 pls_seq;
  72         unsigned long pls_flags;
  73         struct pnfs_layout_hdr *pls_layout;
  74 };
  75
  76 enum pnfs_try_status {
  77         PNFS_ATTEMPTED     = 0,
  78         PNFS_NOT_ATTEMPTED = 1,
  79         PNFS_TRY_AGAIN     = 2,
  80 };
  81
  82 /* error codes for internal use */
  83 #define NFS4ERR_RESET_TO_MDS   12001
  84 #define NFS4ERR_RESET_TO_PNFS  12002
  85
  86 #ifdef CONFIG_NFS_V4_1
  87
  88 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
  89
  90 /*
  91  * Default data server connection timeout and retrans vaules.
  92  * Set by module parameters dataserver_timeo and dataserver_retrans.
  93  */
  94 #define NFS4_DEF_DS_TIMEO   600 /* in tenths of a second */
  95 #define NFS4_DEF_DS_RETRANS 5
  96 #define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ)
  97
  98 enum {
  99         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
 100         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
 101         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
 102         NFS_LAYOUT_RETURN,              /* layoutreturn in progress */
 103         NFS_LAYOUT_RETURN_LOCK,         /* Serialise layoutreturn */
 104         NFS_LAYOUT_RETURN_REQUESTED,    /* Return this layout ASAP */
 105         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
 106         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first layoutget */
 107         NFS_LAYOUT_INODE_FREEING,       /* The inode is being freed */
 108 };
 109
 110 enum layoutdriver_policy_flags {
 111         /* Should the pNFS client commit and return the layout upon truncate to
 112          * a smaller size */
 113         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
 114         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
 115         PNFS_READ_WHOLE_PAGE            = 1 << 2,
 116         PNFS_LAYOUTGET_ON_OPEN          = 1 << 3,
 117 };
 118
 119 struct nfs4_deviceid_node;
 120
 121 /* Per-layout driver specific registration structure */
 122 struct pnfs_layoutdriver_type {
 123         struct list_head pnfs_tblid;
 124         const u32 id;
 125         const char *name;
 126         struct module *owner;
 127         unsigned flags;
 128         unsigned max_deviceinfo_size;
 129         unsigned max_layoutget_response;
 130
 131         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
 132         int (*clear_layoutdriver) (struct nfs_server *);
 133
 134         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
 135         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
 136
 137         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
 138         void (*free_lseg) (struct pnfs_layout_segment *lseg);
 139         void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
 140                         struct pnfs_layout_segment *lseg,
 141                         struct list_head *free_me);
 142
 143         void (*return_range) (struct pnfs_layout_hdr *lo,
 144                               struct pnfs_layout_range *range);
 145
 146         /* test for nfs page cache coalescing */
 147         const struct nfs_pageio_ops *pg_read_ops;
 148         const struct nfs_pageio_ops *pg_write_ops;
 149
 150         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
 151         void (*mark_request_commit) (struct nfs_page *req,
 152                                      struct pnfs_layout_segment *lseg,
 153                                      struct nfs_commit_info *cinfo,
 154                                      u32 ds_commit_idx);
 155         void (*clear_request_commit) (struct nfs_page *req,
 156                                       struct nfs_commit_info *cinfo);
 157         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 158                                   int max);
 159         void (*recover_commit_reqs) (struct list_head *list,
 160                                      struct nfs_commit_info *cinfo);
 161         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
 162                                                 struct page *page);
 163         int (*commit_pagelist)(struct inode *inode,
 164                                struct list_head *mds_pages,
 165                                int how,
 166                                struct nfs_commit_info *cinfo);
 167
 168         int (*sync)(struct inode *inode, bool datasync);
 169
 170         /*
 171          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 172          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 173          */
 174         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 175         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 176
 177         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 178         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 179                         (struct nfs_server *server, struct pnfs_device *pdev,
 180                         gfp_t gfp_flags);
 181
 182         int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);
 183
 184         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 185         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
 186         int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
 187 };
 188
 189 struct pnfs_layout_hdr {
 190         refcount_t              plh_refcount;
 191         atomic_t                plh_outstanding; /* number of RPCs out */
 192         struct list_head        plh_layouts;   /* other client layouts */
 193         struct list_head        plh_bulk_destroy;
 194         struct list_head        plh_segs;      /* layout segments list */
 195         struct list_head        plh_return_segs; /* invalid layout segments */
 196         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 197         unsigned long           plh_retry_timestamp;
 198         unsigned long           plh_flags;
 199         nfs4_stateid            plh_stateid;
 200         u32                     plh_barrier; /* ignore lower seqids */
 201         u32                     plh_return_seq;
 202         enum pnfs_iomode        plh_return_iomode;
 203         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 204         const struct cred       *plh_lc_cred; /* layoutcommit cred */
 205         struct inode            *plh_inode;
 206 };
 207
 208 struct pnfs_device {
 209         struct nfs4_deviceid dev_id;
 210         unsigned int  layout_type;
 211         unsigned int  mincount;
 212         unsigned int  maxcount; /* gdia_maxcount */
 213         struct page **pages;
 214         unsigned int  pgbase;
 215         unsigned int  pglen;    /* reply buffer length */
 216         unsigned char nocache : 1;/* May not be cached */
 217 };
 218
 219 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 220
 221 struct pnfs_devicelist {
 222         unsigned int            eof;
 223         unsigned int            num_devs;
 224         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 225 };
 226
 227 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 228 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 229
 230 /* nfs4proc.c */
 231 extern size_t max_response_pages(struct nfs_server *server);
 232 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 233                                    struct pnfs_device *dev,
 234                                    const struct cred *cred);
 235 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout);
 236 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
 237
 238 /* pnfs.c */
 239 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 240 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 241
 242 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
 243 void unset_pnfs_layoutdriver(struct nfs_server *);
 244 void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
 245 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 246 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 247 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 248                                 struct nfs_page *req, u64 wb_size);
 249 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
 250 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 251 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 252                             struct nfs_page *prev, struct nfs_page *req);
 253 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 254 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 255 void pnfs_layoutget_free(struct nfs4_layoutget *lgp);
 256 void pnfs_free_lseg_list(struct list_head *tmp_list);
 257 void pnfs_destroy_layout(struct nfs_inode *);
 258 void pnfs_destroy_all_layouts(struct nfs_client *);
 259 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 260                 struct nfs_fsid *fsid,
 261                 bool is_recall);
 262 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 263                 bool is_recall);
 264 bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
 265                 struct pnfs_layout_range *dst_range,
 266                 struct inode *inode);
 267 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 268 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 269                              const nfs4_stateid *new,
 270                              bool update_barrier);
 271 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 272                                 struct list_head *tmp_list,
 273                                 const struct pnfs_layout_range *recall_range,
 274                                 u32 seq);
 275 int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
 276                                 struct list_head *tmp_list,
 277                                 const struct pnfs_layout_range *recall_range,
 278                                 u32 seq);
 279 int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
 280                 struct list_head *lseg_list);
 281 bool pnfs_roc(struct inode *ino,
 282                 struct nfs4_layoutreturn_args *args,
 283                 struct nfs4_layoutreturn_res *res,
 284                 const struct cred *cred);
 285 int pnfs_roc_done(struct rpc_task *task, struct inode *inode,
 286                 struct nfs4_layoutreturn_args **argpp,
 287                 struct nfs4_layoutreturn_res **respp,
 288                 int *ret);
 289 void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
 290                 struct nfs4_layoutreturn_res *res,
 291                 int ret);
 292 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
 293 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
 294 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 295 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 296 int pnfs_generic_sync(struct inode *inode, bool datasync);
 297 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
 298 int _pnfs_return_layout(struct inode *);
 299 int pnfs_commit_and_return_layout(struct inode *);
 300 void pnfs_ld_write_done(struct nfs_pgio_header *);
 301 void pnfs_ld_read_done(struct nfs_pgio_header *);
 302 void pnfs_read_resend_pnfs(struct nfs_pgio_header *);
 303 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 304                                                struct nfs_open_context *ctx,
 305                                                loff_t pos,
 306                                                u64 count,
 307                                                enum pnfs_iomode iomode,
 308                                                bool strict_iomode,
 309                                                gfp_t gfp_flags);
 310 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
 311                 const nfs4_stateid *arg_stateid,
 312                 const struct pnfs_layout_range *range,
 313                 const nfs4_stateid *stateid);
 314
 315 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
 316                    struct pnfs_layout_segment *lseg,
 317                    bool (*is_after)(const struct pnfs_layout_range *lseg_range,
 318                            const struct pnfs_layout_range *old),
 319                    bool (*do_merge)(struct pnfs_layout_segment *lseg,
 320                            struct pnfs_layout_segment *old),
 321                    struct list_head *free_me);
 322
 323 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 324 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 325 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 326 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 327 void pnfs_error_mark_layout_for_return(struct inode *inode,
 328                                        struct pnfs_layout_segment *lseg);
 329 /* nfs4_deviceid_flags */
 330 enum {
 331         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 332         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 333         NFS_DEVICEID_NOCACHE,           /* device may not be cached */
 334 };
 335
 336 /* pnfs_dev.c */
 337 struct nfs4_deviceid_node {
 338         struct hlist_node               node;
 339         struct hlist_node               tmpnode;
 340         const struct pnfs_layoutdriver_type *ld;
 341         const struct nfs_client         *nfs_client;
 342         unsigned long                   flags;
 343         unsigned long                   timestamp_unavailable;
 344         struct nfs4_deviceid            deviceid;
 345         struct rcu_head                 rcu;
 346         atomic_t                        ref;
 347 };
 348
 349 struct nfs4_deviceid_node *
 350 nfs4_find_get_deviceid(struct nfs_server *server,
 351                 const struct nfs4_deviceid *id, const struct cred *cred,
 352                 gfp_t gfp_mask);
 353 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 354 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 355                              const struct nfs4_deviceid *);
 356 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 357 void nfs4_mark_deviceid_available(struct nfs4_deviceid_node *node);
 358 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 359 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 360 void nfs4_deviceid_purge_client(const struct nfs_client *);
 361
 362 /* pnfs_nfs.c */
 363 void pnfs_generic_clear_request_commit(struct nfs_page *req,
 364                                        struct nfs_commit_info *cinfo);
 365 void pnfs_generic_commit_release(void *calldata);
 366 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
 367 void pnfs_generic_rw_release(void *data);
 368 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
 369                                       struct nfs_commit_info *cinfo);
 370 int pnfs_generic_commit_pagelist(struct inode *inode,
 371                                  struct list_head *mds_pages,
 372                                  int how,
 373                                  struct nfs_commit_info *cinfo,
 374                                  int (*initiate_commit)(struct nfs_commit_data *data,
 375                                                         int how));
 376 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
 377 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
 378 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
 379 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
 380                                       gfp_t gfp_flags);
 381 void nfs4_pnfs_v3_ds_connect_unload(void);
 382 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
 383                           struct nfs4_deviceid_node *devid, unsigned int timeo,
 384                           unsigned int retrans, u32 version, u32 minor_version);
 385 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 386                                                  struct xdr_stream *xdr,
 387                                                  gfp_t gfp_flags);
 388 void pnfs_layout_mark_request_commit(struct nfs_page *req,
 389                                      struct pnfs_layout_segment *lseg,
 390                                      struct nfs_commit_info *cinfo,
 391                                      u32 ds_commit_idx);
 392 void pnfs_lgopen_prepare(struct nfs4_opendata *data,
 393                          struct nfs_open_context *ctx);
 394 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
 395                        struct nfs_open_context *ctx);
 396 void nfs4_lgopen_release(struct nfs4_layoutget *lgp);
 397
 398 static inline bool nfs_have_layout(struct inode *inode)
 399 {
 400         return NFS_I(inode)->layout != NULL;
 401 }
 402
 403 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
 404 {
 405         return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
 406 }
 407
 408 static inline struct nfs4_deviceid_node *
 409 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 410 {
 411         atomic_inc(&d->ref);
 412         return d;
 413 }
 414
 415 static inline struct pnfs_layout_segment *
 416 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 417 {
 418         if (lseg) {
 419                 refcount_inc(&lseg->pls_refcount);
 420                 smp_mb__after_atomic();
 421         }
 422         return lseg;
 423 }
 424
 425 static inline bool
 426 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
 427 {
 428         return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
 429 }
 430
 431 /* Return true if a layout driver is being used for this mountpoint */
 432 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 433 {
 434         return nfss->pnfs_curr_ld != NULL;
 435 }
 436
 437 static inline int
 438 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 439                  struct nfs_commit_info *cinfo)
 440 {
 441         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 442                 return PNFS_NOT_ATTEMPTED;
 443         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 444 }
 445
 446 static inline struct pnfs_ds_commit_info *
 447 pnfs_get_ds_info(struct inode *inode)
 448 {
 449         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 450
 451         if (ld == NULL || ld->get_ds_info == NULL)
 452                 return NULL;
 453         return ld->get_ds_info(inode);
 454 }
 455
 456 static inline void
 457 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
 458 {
 459         set_bit(NFS_DEVICEID_INVALID, &node->flags);
 460 }
 461
 462 static inline bool
 463 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 464                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 465 {
 466         struct inode *inode = d_inode(nfs_req_openctx(req)->dentry);
 467         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 468
 469         if (lseg == NULL || ld->mark_request_commit == NULL)
 470                 return false;
 471         ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
 472         return true;
 473 }
 474
 475 static inline bool
 476 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 477 {
 478         struct inode *inode = d_inode(nfs_req_openctx(req)->dentry);
 479         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 480
 481         if (ld == NULL || ld->clear_request_commit == NULL)
 482                 return false;
 483         ld->clear_request_commit(req, cinfo);
 484         return true;
 485 }
 486
 487 static inline int
 488 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 489                        int max)
 490 {
 491         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 492                 return 0;
 493         else
 494                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 495 }
 496
 497 static inline struct nfs_page *
 498 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 499                         struct page *page)
 500 {
 501         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 502
 503         if (ld == NULL || ld->search_commit_reqs == NULL)
 504                 return NULL;
 505         return ld->search_commit_reqs(cinfo, page);
 506 }
 507
 508 /* Should the pNFS client commit and return the layout upon a setattr */
 509 static inline bool
 510 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 511 {
 512         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 513                 return false;
 514         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 515                 PNFS_LAYOUTRET_ON_SETATTR;
 516 }
 517
 518 static inline bool
 519 pnfs_ld_read_whole_page(struct inode *inode)
 520 {
 521         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 522                 return false;
 523         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
 524 }
 525
 526 static inline int
 527 pnfs_sync_inode(struct inode *inode, bool datasync)
 528 {
 529         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 530                 return 0;
 531         return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
 532 }
 533
 534 static inline bool
 535 pnfs_layoutcommit_outstanding(struct inode *inode)
 536 {
 537         struct nfs_inode *nfsi = NFS_I(inode);
 538
 539         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
 540                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
 541 }
 542
 543 static inline int pnfs_return_layout(struct inode *ino)
 544 {
 545         struct nfs_inode *nfsi = NFS_I(ino);
 546         struct nfs_server *nfss = NFS_SERVER(ino);
 547
 548         if (pnfs_enabled_sb(nfss) && nfsi->layout) {
 549                 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &nfsi->layout->plh_flags);
 550                 return _pnfs_return_layout(ino);
 551         }
 552
 553         return 0;
 554 }
 555
 556 static inline bool
 557 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 558                    struct nfs_server *nfss)
 559 {
 560         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 561                                         nfss->pnfs_curr_ld->id == src->l_type);
 562 }
 563
 564 static inline u64
 565 pnfs_calc_offset_end(u64 offset, u64 len)
 566 {
 567         if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
 568                 return NFS4_MAX_UINT64;
 569         return offset + len - 1;
 570 }
 571
 572 static inline u64
 573 pnfs_calc_offset_length(u64 offset, u64 end)
 574 {
 575         if (end == NFS4_MAX_UINT64 || end <= offset)
 576                 return NFS4_MAX_UINT64;
 577         return 1 + end - offset;
 578 }
 579
 580 static inline void
 581 pnfs_copy_range(struct pnfs_layout_range *dst,
 582                 const struct pnfs_layout_range *src)
 583 {
 584         memcpy(dst, src, sizeof(*dst));
 585 }
 586
 587 static inline u64
 588 pnfs_end_offset(u64 start, u64 len)
 589 {
 590         if (NFS4_MAX_UINT64 - start <= len)
 591                 return NFS4_MAX_UINT64;
 592         return start + len;
 593 }
 594
 595 /*
 596  * Are 2 ranges intersecting?
 597  *   start1                             end1
 598  *   [----------------------------------)
 599  *                                start2           end2
 600  *                                [----------------)
 601  */
 602 static inline bool
 603 pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
 604 {
 605         return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
 606                 (end2 == NFS4_MAX_UINT64 || start1 < end2);
 607 }
 608
 609 static inline bool
 610 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
 611                 const struct pnfs_layout_range *l2)
 612 {
 613         u64 end1 = pnfs_end_offset(l1->offset, l1->length);
 614         u64 end2 = pnfs_end_offset(l2->offset, l2->length);
 615
 616         return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
 617 }
 618
 619 static inline bool
 620 pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
 621 {
 622         u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
 623         u64 req_last = req_offset(req) + req->wb_bytes;
 624
 625         return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
 626                                 req_offset(req), req_last);
 627 }
 628
 629 extern unsigned int layoutstats_timer;
 630
 631 #ifdef NFS_DEBUG
 632 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 633 #else
 634 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 635 {
 636 }
 637
 638 #endif /* NFS_DEBUG */
 639 #else  /* CONFIG_NFS_V4_1 */
 640
 641 static inline bool nfs_have_layout(struct inode *inode)
 642 {
 643         return false;
 644 }
 645
 646 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 647 {
 648 }
 649
 650 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 651 {
 652 }
 653
 654 static inline struct pnfs_layout_segment *
 655 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 656 {
 657         return NULL;
 658 }
 659
 660 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 661 {
 662 }
 663
 664 static inline int pnfs_return_layout(struct inode *ino)
 665 {
 666         return 0;
 667 }
 668
 669 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 670 {
 671         return 0;
 672 }
 673
 674 static inline bool
 675 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 676 {
 677         return false;
 678 }
 679
 680 static inline bool
 681 pnfs_ld_read_whole_page(struct inode *inode)
 682 {
 683         return false;
 684 }
 685
 686 static inline int
 687 pnfs_sync_inode(struct inode *inode, bool datasync)
 688 {
 689         return 0;
 690 }
 691
 692 static inline bool
 693 pnfs_layoutcommit_outstanding(struct inode *inode)
 694 {
 695         return false;
 696 }
 697
 698
 699 static inline bool
 700 pnfs_roc(struct inode *ino,
 701                 struct nfs4_layoutreturn_args *args,
 702                 struct nfs4_layoutreturn_res *res,
 703                 const struct cred *cred)
 704 {
 705         return false;
 706 }
 707
 708 static inline int
 709 pnfs_roc_done(struct rpc_task *task, struct inode *inode,
 710                 struct nfs4_layoutreturn_args **argpp,
 711                 struct nfs4_layoutreturn_res **respp,
 712                 int *ret)
 713 {
 714         return 0;
 715 }
 716
 717 static inline void
 718 pnfs_roc_release(struct nfs4_layoutreturn_args *args,
 719                 struct nfs4_layoutreturn_res *res,
 720                 int ret)
 721 {
 722 }
 723
 724 static inline bool
 725 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
 726 {
 727         return false;
 728 }
 729
 730 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 731                                          const struct nfs_fh *mntfh,
 732                                          struct nfs_fsinfo *fsinfo)
 733 {
 734 }
 735
 736 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 737 {
 738 }
 739
 740 static inline int
 741 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 742                  struct nfs_commit_info *cinfo)
 743 {
 744         return PNFS_NOT_ATTEMPTED;
 745 }
 746
 747 static inline struct pnfs_ds_commit_info *
 748 pnfs_get_ds_info(struct inode *inode)
 749 {
 750         return NULL;
 751 }
 752
 753 static inline bool
 754 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 755                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 756 {
 757         return false;
 758 }
 759
 760 static inline bool
 761 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 762 {
 763         return false;
 764 }
 765
 766 static inline int
 767 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 768                        int max)
 769 {
 770         return 0;
 771 }
 772
 773 static inline struct nfs_page *
 774 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 775                         struct page *page)
 776 {
 777         return NULL;
 778 }
 779
 780 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 781 {
 782         return 0;
 783 }
 784
 785 static inline bool
 786 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 787                    struct nfs_server *nfss)
 788 {
 789         return false;
 790 }
 791
 792 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 793 {
 794         return NULL;
 795 }
 796
 797 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 798 {
 799 }
 800
 801 static inline bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
 802                 struct pnfs_layout_range *dst_range,
 803                 struct inode *inode)
 804 {
 805         return false;
 806 }
 807
 808 static inline void pnfs_lgopen_prepare(struct nfs4_opendata *data,
 809                 struct nfs_open_context *ctx)
 810 {
 811 }
 812
 813 static inline void pnfs_parse_lgopen(struct inode *ino,
 814                 struct nfs4_layoutget *lgp,
 815                 struct nfs_open_context *ctx)
 816 {
 817 }
 818
 819 static inline void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
 820 {
 821 }
 822
 823 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
 824 {
 825         return false;
 826 }
 827
 828 #endif /* CONFIG_NFS_V4_1 */
 829
 830 #if IS_ENABLED(CONFIG_NFS_V4_2)
 831 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
 832 #else
 833 static inline int
 834 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
 835 {
 836         return 0;
 837 }
 838 #endif
 839
 840 #endif /* FS_NFS_PNFS_H */