fs/nfs/pnfs.h

   1 /*
   2  *  pNFS client data structures.
   3  *
   4  *  Copyright (c) 2002
   5  *  The Regents of the University of Michigan
   6  *  All Rights Reserved
   7  *
   8  *  Dean Hildebrand <dhildebz@umich.edu>
   9  *
  10  *  Permission is granted to use, copy, create derivative works, and
  11  *  redistribute this software and such derivative works for any purpose,
  12  *  so long as the name of the University of Michigan is not used in
  13  *  any advertising or publicity pertaining to the use or distribution
  14  *  of this software without specific, written prior authorization. If
  15  *  the above copyright notice or any other identification of the
  16  *  University of Michigan is included in any copy of any portion of
  17  *  this software, then the disclaimer below must also be included.
  18  *
  19  *  This software is provided as is, without representation or warranty
  20  *  of any kind either express or implied, including without limitation
  21  *  the implied warranties of merchantability, fitness for a particular
  22  *  purpose, or noninfringement.  The Regents of the University of
  23  *  Michigan shall not be liable for any damages, including special,
  24  *  indirect, incidental, or consequential damages, with respect to any
  25  *  claim arising out of or in connection with the use of the software,
  26  *  even if it has been or is hereafter advised of the possibility of
  27  *  such damages.
  28  */
  29
  30 #ifndef FS_NFS_PNFS_H
  31 #define FS_NFS_PNFS_H
  32
  33 #include <linux/nfs_fs.h>
  34 #include <linux/nfs_page.h>
  35 #include <linux/workqueue.h>
  36
  37 enum {
  38         NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
  39         NFS_LSEG_ROC,           /* roc bit received from server */
  40         NFS_LSEG_LAYOUTCOMMIT,  /* layoutcommit bit set for layoutcommit */
  41         NFS_LSEG_LAYOUTRETURN,  /* layoutreturn bit set for layoutreturn */
  42 };
  43
  44 /* Individual ip address */
  45 struct nfs4_pnfs_ds_addr {
  46         struct sockaddr_storage da_addr;
  47         size_t                  da_addrlen;
  48         struct list_head        da_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  49         char                    *da_remotestr;  /* human readable addr+port */
  50 };
  51
  52 struct nfs4_pnfs_ds {
  53         struct list_head        ds_node;  /* nfs4_pnfs_dev_hlist dev_dslist */
  54         char                    *ds_remotestr;  /* comma sep list of addrs */
  55         struct list_head        ds_addrs;
  56         struct nfs_client       *ds_clp;
  57         atomic_t                ds_count;
  58         unsigned long           ds_state;
  59 #define NFS4DS_CONNECTING       0       /* ds is establishing connection */
  60 };
  61
  62 struct pnfs_layout_segment {
  63         struct list_head pls_list;
  64         struct list_head pls_lc_list;
  65         struct pnfs_layout_range pls_range;
  66         atomic_t pls_refcount;
  67         unsigned long pls_flags;
  68         struct pnfs_layout_hdr *pls_layout;
  69         struct work_struct pls_work;
  70 };
  71
  72 enum pnfs_try_status {
  73         PNFS_ATTEMPTED     = 0,
  74         PNFS_NOT_ATTEMPTED = 1,
  75         PNFS_TRY_AGAIN     = 2,
  76 };
  77
  78 #ifdef CONFIG_NFS_V4_1
  79
  80 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
  81
  82 /*
  83  * Default data server connection timeout and retrans vaules.
  84  * Set by module parameters dataserver_timeo and dataserver_retrans.
  85  */
  86 #define NFS4_DEF_DS_TIMEO   600 /* in tenths of a second */
  87 #define NFS4_DEF_DS_RETRANS 5
  88
  89 /* error codes for internal use */
  90 #define NFS4ERR_RESET_TO_MDS   12001
  91 #define NFS4ERR_RESET_TO_PNFS  12002
  92
  93 enum {
  94         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
  95         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
  96         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
  97         NFS_LAYOUT_RETURN,              /* layoutreturn in progress */
  98         NFS_LAYOUT_RETURN_REQUESTED,    /* Return this layout ASAP */
  99         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
 100         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first layoutget */
 101 };
 102
 103 enum layoutdriver_policy_flags {
 104         /* Should the pNFS client commit and return the layout upon truncate to
 105          * a smaller size */
 106         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
 107         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
 108         PNFS_READ_WHOLE_PAGE            = 1 << 2,
 109 };
 110
 111 struct nfs4_deviceid_node;
 112
 113 /* Per-layout driver specific registration structure */
 114 struct pnfs_layoutdriver_type {
 115         struct list_head pnfs_tblid;
 116         const u32 id;
 117         const char *name;
 118         struct module *owner;
 119         unsigned flags;
 120         unsigned max_deviceinfo_size;
 121
 122         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
 123         int (*clear_layoutdriver) (struct nfs_server *);
 124
 125         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
 126         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
 127
 128         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
 129         void (*free_lseg) (struct pnfs_layout_segment *lseg);
 130         void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
 131                         struct pnfs_layout_segment *lseg,
 132                         struct list_head *free_me);
 133
 134         void (*return_range) (struct pnfs_layout_hdr *lo,
 135                               struct pnfs_layout_range *range);
 136
 137         /* test for nfs page cache coalescing */
 138         const struct nfs_pageio_ops *pg_read_ops;
 139         const struct nfs_pageio_ops *pg_write_ops;
 140
 141         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
 142         void (*mark_request_commit) (struct nfs_page *req,
 143                                      struct pnfs_layout_segment *lseg,
 144                                      struct nfs_commit_info *cinfo,
 145                                      u32 ds_commit_idx);
 146         void (*clear_request_commit) (struct nfs_page *req,
 147                                       struct nfs_commit_info *cinfo);
 148         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 149                                   int max);
 150         void (*recover_commit_reqs) (struct list_head *list,
 151                                      struct nfs_commit_info *cinfo);
 152         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
 153                                                 struct page *page);
 154         int (*commit_pagelist)(struct inode *inode,
 155                                struct list_head *mds_pages,
 156                                int how,
 157                                struct nfs_commit_info *cinfo);
 158
 159         int (*sync)(struct inode *inode, bool datasync);
 160
 161         /*
 162          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 163          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 164          */
 165         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 166         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 167
 168         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 169         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 170                         (struct nfs_server *server, struct pnfs_device *pdev,
 171                         gfp_t gfp_flags);
 172
 173         void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid,
 174                                      struct xdr_stream *xdr,
 175                                      const struct nfs4_layoutreturn_args *args);
 176
 177         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 178         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
 179         void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo,
 180                                      struct xdr_stream *xdr,
 181                                      const struct nfs4_layoutcommit_args *args);
 182         int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
 183         void (*cleanup_layoutstats) (struct nfs42_layoutstat_data *data);
 184 };
 185
 186 struct pnfs_layout_hdr {
 187         atomic_t                plh_refcount;
 188         atomic_t                plh_outstanding; /* number of RPCs out */
 189         struct list_head        plh_layouts;   /* other client layouts */
 190         struct list_head        plh_bulk_destroy;
 191         struct list_head        plh_segs;      /* layout segments list */
 192         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 193         unsigned long           plh_retry_timestamp;
 194         unsigned long           plh_flags;
 195         nfs4_stateid            plh_stateid;
 196         u32                     plh_barrier; /* ignore lower seqids */
 197         enum pnfs_iomode        plh_return_iomode;
 198         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 199         struct rpc_cred         *plh_lc_cred; /* layoutcommit cred */
 200         struct inode            *plh_inode;
 201 };
 202
 203 struct pnfs_device {
 204         struct nfs4_deviceid dev_id;
 205         unsigned int  layout_type;
 206         unsigned int  mincount;
 207         unsigned int  maxcount; /* gdia_maxcount */
 208         struct page **pages;
 209         unsigned int  pgbase;
 210         unsigned int  pglen;    /* reply buffer length */
 211         unsigned char nocache : 1;/* May not be cached */
 212 };
 213
 214 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 215
 216 struct pnfs_devicelist {
 217         unsigned int            eof;
 218         unsigned int            num_devs;
 219         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 220 };
 221
 222 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 223 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 224
 225 /* nfs4proc.c */
 226 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 227                                    struct pnfs_device *dev,
 228                                    struct rpc_cred *cred);
 229 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags);
 230 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
 231
 232 /* pnfs.c */
 233 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 234 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 235 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg);
 236
 237 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32);
 238 void unset_pnfs_layoutdriver(struct nfs_server *);
 239 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 240 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 241 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 242                                 struct nfs_page *req, u64 wb_size);
 243 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
 244 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 245 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 246                             struct nfs_page *prev, struct nfs_page *req);
 247 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 248 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 249 void pnfs_free_lseg_list(struct list_head *tmp_list);
 250 void pnfs_destroy_layout(struct nfs_inode *);
 251 void pnfs_destroy_all_layouts(struct nfs_client *);
 252 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 253                 struct nfs_fsid *fsid,
 254                 bool is_recall);
 255 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 256                 bool is_recall);
 257 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 258 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 259                              const nfs4_stateid *new,
 260                              bool update_barrier);
 261 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst,
 262                                   struct pnfs_layout_hdr *lo,
 263                                   const struct pnfs_layout_range *range,
 264                                   struct nfs4_state *open_state);
 265 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 266                                 struct list_head *tmp_list,
 267                                 const struct pnfs_layout_range *recall_range);
 268 int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
 269                                 struct list_head *tmp_list,
 270                                 const struct pnfs_layout_range *recall_range);
 271 bool pnfs_roc(struct inode *ino);
 272 void pnfs_roc_release(struct inode *ino);
 273 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier);
 274 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier);
 275 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
 276 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
 277 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 278 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 279 int pnfs_generic_sync(struct inode *inode, bool datasync);
 280 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
 281 int _pnfs_return_layout(struct inode *);
 282 int pnfs_commit_and_return_layout(struct inode *);
 283 void pnfs_ld_write_done(struct nfs_pgio_header *);
 284 void pnfs_ld_read_done(struct nfs_pgio_header *);
 285 int pnfs_read_resend_pnfs(struct nfs_pgio_header *);
 286 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 287                                                struct nfs_open_context *ctx,
 288                                                loff_t pos,
 289                                                u64 count,
 290                                                enum pnfs_iomode iomode,
 291                                                gfp_t gfp_flags);
 292 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo);
 293
 294 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
 295                    struct pnfs_layout_segment *lseg,
 296                    bool (*is_after)(const struct pnfs_layout_range *lseg_range,
 297                            const struct pnfs_layout_range *old),
 298                    bool (*do_merge)(struct pnfs_layout_segment *lseg,
 299                            struct pnfs_layout_segment *old),
 300                    struct list_head *free_me);
 301
 302 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 303 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 304 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 305 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 306 void pnfs_error_mark_layout_for_return(struct inode *inode,
 307                                        struct pnfs_layout_segment *lseg);
 308 /* nfs4_deviceid_flags */
 309 enum {
 310         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 311         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 312         NFS_DEVICEID_NOCACHE,           /* device may not be cached */
 313 };
 314
 315 /* pnfs_dev.c */
 316 struct nfs4_deviceid_node {
 317         struct hlist_node               node;
 318         struct hlist_node               tmpnode;
 319         const struct pnfs_layoutdriver_type *ld;
 320         const struct nfs_client         *nfs_client;
 321         unsigned long                   flags;
 322         unsigned long                   timestamp_unavailable;
 323         struct nfs4_deviceid            deviceid;
 324         struct rcu_head                 rcu;
 325         atomic_t                        ref;
 326 };
 327
 328 struct nfs4_deviceid_node *
 329 nfs4_find_get_deviceid(struct nfs_server *server,
 330                 const struct nfs4_deviceid *id, struct rpc_cred *cred,
 331                 gfp_t gfp_mask);
 332 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 333 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 334                              const struct nfs4_deviceid *);
 335 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 336 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 337 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 338 void nfs4_deviceid_purge_client(const struct nfs_client *);
 339
 340 /* pnfs_nfs.c */
 341 void pnfs_generic_clear_request_commit(struct nfs_page *req,
 342                                        struct nfs_commit_info *cinfo);
 343 void pnfs_generic_commit_release(void *calldata);
 344 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
 345 void pnfs_generic_rw_release(void *data);
 346 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
 347                                       struct nfs_commit_info *cinfo);
 348 int pnfs_generic_commit_pagelist(struct inode *inode,
 349                                  struct list_head *mds_pages,
 350                                  int how,
 351                                  struct nfs_commit_info *cinfo,
 352                                  int (*initiate_commit)(struct nfs_commit_data *data,
 353                                                         int how));
 354 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
 355 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
 356 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
 357 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
 358                                       gfp_t gfp_flags);
 359 void nfs4_pnfs_v3_ds_connect_unload(void);
 360 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
 361                           struct nfs4_deviceid_node *devid, unsigned int timeo,
 362                           unsigned int retrans, u32 version, u32 minor_version,
 363                           rpc_authflavor_t au_flavor);
 364 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 365                                                  struct xdr_stream *xdr,
 366                                                  gfp_t gfp_flags);
 367 void pnfs_layout_mark_request_commit(struct nfs_page *req,
 368                                      struct pnfs_layout_segment *lseg,
 369                                      struct nfs_commit_info *cinfo,
 370                                      u32 ds_commit_idx);
 371
 372 static inline bool nfs_have_layout(struct inode *inode)
 373 {
 374         return NFS_I(inode)->layout != NULL;
 375 }
 376
 377 static inline struct nfs4_deviceid_node *
 378 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 379 {
 380         atomic_inc(&d->ref);
 381         return d;
 382 }
 383
 384 static inline struct pnfs_layout_segment *
 385 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 386 {
 387         if (lseg) {
 388                 atomic_inc(&lseg->pls_refcount);
 389                 smp_mb__after_atomic();
 390         }
 391         return lseg;
 392 }
 393
 394 static inline bool
 395 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
 396 {
 397         return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
 398 }
 399
 400 /* Return true if a layout driver is being used for this mountpoint */
 401 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 402 {
 403         return nfss->pnfs_curr_ld != NULL;
 404 }
 405
 406 static inline int
 407 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 408                  struct nfs_commit_info *cinfo)
 409 {
 410         if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0)
 411                 return PNFS_NOT_ATTEMPTED;
 412         return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo);
 413 }
 414
 415 static inline struct pnfs_ds_commit_info *
 416 pnfs_get_ds_info(struct inode *inode)
 417 {
 418         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 419
 420         if (ld == NULL || ld->get_ds_info == NULL)
 421                 return NULL;
 422         return ld->get_ds_info(inode);
 423 }
 424
 425 static inline void
 426 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
 427 {
 428         set_bit(NFS_DEVICEID_INVALID, &node->flags);
 429 }
 430
 431 static inline bool
 432 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 433                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 434 {
 435         struct inode *inode = d_inode(req->wb_context->dentry);
 436         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 437
 438         if (lseg == NULL || ld->mark_request_commit == NULL)
 439                 return false;
 440         ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
 441         return true;
 442 }
 443
 444 static inline bool
 445 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 446 {
 447         struct inode *inode = d_inode(req->wb_context->dentry);
 448         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 449
 450         if (ld == NULL || ld->clear_request_commit == NULL)
 451                 return false;
 452         ld->clear_request_commit(req, cinfo);
 453         return true;
 454 }
 455
 456 static inline int
 457 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 458                        int max)
 459 {
 460         if (cinfo->ds == NULL || cinfo->ds->nwritten == 0)
 461                 return 0;
 462         else
 463                 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max);
 464 }
 465
 466 static inline struct nfs_page *
 467 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 468                         struct page *page)
 469 {
 470         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 471
 472         if (ld == NULL || ld->search_commit_reqs == NULL)
 473                 return NULL;
 474         return ld->search_commit_reqs(cinfo, page);
 475 }
 476
 477 /* Should the pNFS client commit and return the layout upon a setattr */
 478 static inline bool
 479 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 480 {
 481         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 482                 return false;
 483         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 484                 PNFS_LAYOUTRET_ON_SETATTR;
 485 }
 486
 487 static inline bool
 488 pnfs_ld_read_whole_page(struct inode *inode)
 489 {
 490         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 491                 return false;
 492         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
 493 }
 494
 495 static inline int
 496 pnfs_sync_inode(struct inode *inode, bool datasync)
 497 {
 498         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 499                 return 0;
 500         return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
 501 }
 502
 503 static inline bool
 504 pnfs_layoutcommit_outstanding(struct inode *inode)
 505 {
 506         struct nfs_inode *nfsi = NFS_I(inode);
 507
 508         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
 509                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
 510 }
 511
 512 static inline int pnfs_return_layout(struct inode *ino)
 513 {
 514         struct nfs_inode *nfsi = NFS_I(ino);
 515         struct nfs_server *nfss = NFS_SERVER(ino);
 516
 517         if (pnfs_enabled_sb(nfss) && nfsi->layout)
 518                 return _pnfs_return_layout(ino);
 519
 520         return 0;
 521 }
 522
 523 static inline bool
 524 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 525                    struct nfs_server *nfss)
 526 {
 527         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 528                                         nfss->pnfs_curr_ld->id == src->l_type);
 529 }
 530
 531 static inline u64
 532 pnfs_calc_offset_end(u64 offset, u64 len)
 533 {
 534         if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
 535                 return NFS4_MAX_UINT64;
 536         return offset + len - 1;
 537 }
 538
 539 static inline u64
 540 pnfs_calc_offset_length(u64 offset, u64 end)
 541 {
 542         if (end == NFS4_MAX_UINT64 || end <= offset)
 543                 return NFS4_MAX_UINT64;
 544         return 1 + end - offset;
 545 }
 546
 547 /**
 548  * pnfs_mark_layout_returned_if_empty - marks the layout as returned
 549  * @lo: layout header
 550  *
 551  * Note: Caller must hold inode->i_lock
 552  */
 553 static inline void
 554 pnfs_mark_layout_returned_if_empty(struct pnfs_layout_hdr *lo)
 555 {
 556         if (list_empty(&lo->plh_segs))
 557                 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
 558 }
 559
 560 static inline void
 561 pnfs_copy_range(struct pnfs_layout_range *dst,
 562                 const struct pnfs_layout_range *src)
 563 {
 564         memcpy(dst, src, sizeof(*dst));
 565 }
 566
 567 extern unsigned int layoutstats_timer;
 568
 569 #ifdef NFS_DEBUG
 570 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 571 #else
 572 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 573 {
 574 }
 575
 576 #endif /* NFS_DEBUG */
 577 #else  /* CONFIG_NFS_V4_1 */
 578
 579 static inline bool nfs_have_layout(struct inode *inode)
 580 {
 581         return false;
 582 }
 583
 584 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 585 {
 586 }
 587
 588 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 589 {
 590 }
 591
 592 static inline struct pnfs_layout_segment *
 593 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 594 {
 595         return NULL;
 596 }
 597
 598 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 599 {
 600 }
 601
 602 static inline int pnfs_return_layout(struct inode *ino)
 603 {
 604         return 0;
 605 }
 606
 607 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 608 {
 609         return 0;
 610 }
 611
 612 static inline bool
 613 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 614 {
 615         return false;
 616 }
 617
 618 static inline bool
 619 pnfs_ld_read_whole_page(struct inode *inode)
 620 {
 621         return false;
 622 }
 623
 624 static inline int
 625 pnfs_sync_inode(struct inode *inode, bool datasync)
 626 {
 627         return 0;
 628 }
 629
 630 static inline bool
 631 pnfs_roc(struct inode *ino)
 632 {
 633         return false;
 634 }
 635
 636 static inline void
 637 pnfs_roc_release(struct inode *ino)
 638 {
 639 }
 640
 641 static inline void
 642 pnfs_roc_set_barrier(struct inode *ino, u32 barrier)
 643 {
 644 }
 645
 646 static inline void
 647 pnfs_roc_get_barrier(struct inode *ino, u32 *barrier)
 648 {
 649 }
 650
 651 static inline bool
 652 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
 653 {
 654         return false;
 655 }
 656
 657 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 658                                          const struct nfs_fh *mntfh, u32 id)
 659 {
 660 }
 661
 662 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 663 {
 664 }
 665
 666 static inline int
 667 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 668                  struct nfs_commit_info *cinfo)
 669 {
 670         return PNFS_NOT_ATTEMPTED;
 671 }
 672
 673 static inline struct pnfs_ds_commit_info *
 674 pnfs_get_ds_info(struct inode *inode)
 675 {
 676         return NULL;
 677 }
 678
 679 static inline bool
 680 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 681                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 682 {
 683         return false;
 684 }
 685
 686 static inline bool
 687 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 688 {
 689         return false;
 690 }
 691
 692 static inline int
 693 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 694                        int max)
 695 {
 696         return 0;
 697 }
 698
 699 static inline struct nfs_page *
 700 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 701                         struct page *page)
 702 {
 703         return NULL;
 704 }
 705
 706 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 707 {
 708         return 0;
 709 }
 710
 711 static inline bool
 712 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 713                    struct nfs_server *nfss)
 714 {
 715         return false;
 716 }
 717
 718 static inline bool
 719 pnfs_layoutcommit_outstanding(struct inode *inode)
 720 {
 721         return false;
 722 }
 723
 724
 725 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 726 {
 727         return NULL;
 728 }
 729
 730 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 731 {
 732 }
 733
 734 #endif /* CONFIG_NFS_V4_1 */
 735
 736 #if IS_ENABLED(CONFIG_NFS_V4_2)
 737 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
 738 #else
 739 static inline int
 740 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
 741 {
 742         return 0;
 743 }
 744 #endif
 745
 746 #endif /* FS_NFS_PNFS_H */