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 list_head pls_commits;
  70         struct pnfs_layout_range pls_range;
  71         refcount_t pls_refcount;
  72         u32 pls_seq;
  73         unsigned long pls_flags;
  74         struct pnfs_layout_hdr *pls_layout;
  75 };
  76
  77 enum pnfs_try_status {
  78         PNFS_ATTEMPTED     = 0,
  79         PNFS_NOT_ATTEMPTED = 1,
  80         PNFS_TRY_AGAIN     = 2,
  81 };
  82
  83 /* error codes for internal use */
  84 #define NFS4ERR_RESET_TO_MDS   12001
  85 #define NFS4ERR_RESET_TO_PNFS  12002
  86
  87 #ifdef CONFIG_NFS_V4_1
  88
  89 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
  90
  91 /*
  92  * Default data server connection timeout and retrans vaules.
  93  * Set by module parameters dataserver_timeo and dataserver_retrans.
  94  */
  95 #define NFS4_DEF_DS_TIMEO   600 /* in tenths of a second */
  96 #define NFS4_DEF_DS_RETRANS 5
  97 #define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ)
  98
  99 enum {
 100         NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
 101         NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */
 102         NFS_LAYOUT_BULK_RECALL,         /* bulk recall affecting layout */
 103         NFS_LAYOUT_RETURN,              /* layoutreturn in progress */
 104         NFS_LAYOUT_RETURN_LOCK,         /* Serialise layoutreturn */
 105         NFS_LAYOUT_RETURN_REQUESTED,    /* Return this layout ASAP */
 106         NFS_LAYOUT_INVALID_STID,        /* layout stateid id is invalid */
 107         NFS_LAYOUT_FIRST_LAYOUTGET,     /* Serialize first layoutget */
 108         NFS_LAYOUT_INODE_FREEING,       /* The inode is being freed */
 109         NFS_LAYOUT_HASHED,              /* The layout visible */
 110 };
 111
 112 enum layoutdriver_policy_flags {
 113         /* Should the pNFS client commit and return the layout upon truncate to
 114          * a smaller size */
 115         PNFS_LAYOUTRET_ON_SETATTR       = 1 << 0,
 116         PNFS_LAYOUTRET_ON_ERROR         = 1 << 1,
 117         PNFS_READ_WHOLE_PAGE            = 1 << 2,
 118         PNFS_LAYOUTGET_ON_OPEN          = 1 << 3,
 119 };
 120
 121 struct nfs4_deviceid_node;
 122
 123 /* Per-layout driver specific registration structure */
 124 struct pnfs_layoutdriver_type {
 125         struct list_head pnfs_tblid;
 126         const u32 id;
 127         const char *name;
 128         struct module *owner;
 129         unsigned flags;
 130         unsigned max_deviceinfo_size;
 131         unsigned max_layoutget_response;
 132
 133         int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *);
 134         int (*clear_layoutdriver) (struct nfs_server *);
 135
 136         struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
 137         void (*free_layout_hdr) (struct pnfs_layout_hdr *);
 138
 139         struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags);
 140         void (*free_lseg) (struct pnfs_layout_segment *lseg);
 141         void (*add_lseg) (struct pnfs_layout_hdr *layoutid,
 142                         struct pnfs_layout_segment *lseg,
 143                         struct list_head *free_me);
 144
 145         void (*return_range) (struct pnfs_layout_hdr *lo,
 146                               struct pnfs_layout_range *range);
 147
 148         /* test for nfs page cache coalescing */
 149         const struct nfs_pageio_ops *pg_read_ops;
 150         const struct nfs_pageio_ops *pg_write_ops;
 151
 152         struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode);
 153
 154         int (*sync)(struct inode *inode, bool datasync);
 155
 156         /*
 157          * Return PNFS_ATTEMPTED to indicate the layout code has attempted
 158          * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS
 159          */
 160         enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *);
 161         enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int);
 162
 163         void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 164         struct nfs4_deviceid_node * (*alloc_deviceid_node)
 165                         (struct nfs_server *server, struct pnfs_device *pdev,
 166                         gfp_t gfp_flags);
 167
 168         int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *);
 169
 170         void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data);
 171         int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args);
 172         int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args);
 173 };
 174
 175 struct pnfs_commit_ops {
 176         void (*setup_ds_info)(struct pnfs_ds_commit_info *,
 177                               struct pnfs_layout_segment *);
 178         void (*release_ds_info)(struct pnfs_ds_commit_info *,
 179                                 struct inode *inode);
 180         int (*commit_pagelist)(struct inode *inode,
 181                                struct list_head *mds_pages,
 182                                int how,
 183                                struct nfs_commit_info *cinfo);
 184         void (*mark_request_commit) (struct nfs_page *req,
 185                                      struct pnfs_layout_segment *lseg,
 186                                      struct nfs_commit_info *cinfo,
 187                                      u32 ds_commit_idx);
 188         void (*clear_request_commit) (struct nfs_page *req,
 189                                       struct nfs_commit_info *cinfo);
 190         int (*scan_commit_lists) (struct nfs_commit_info *cinfo,
 191                                   int max);
 192         void (*recover_commit_reqs) (struct list_head *list,
 193                                      struct nfs_commit_info *cinfo);
 194         struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo,
 195                                                 struct page *page);
 196 };
 197
 198 struct pnfs_layout_hdr {
 199         refcount_t              plh_refcount;
 200         atomic_t                plh_outstanding; /* number of RPCs out */
 201         struct list_head        plh_layouts;   /* other client layouts */
 202         struct list_head        plh_bulk_destroy;
 203         struct list_head        plh_segs;      /* layout segments list */
 204         struct list_head        plh_return_segs; /* invalid layout segments */
 205         unsigned long           plh_block_lgets; /* block LAYOUTGET if >0 */
 206         unsigned long           plh_retry_timestamp;
 207         unsigned long           plh_flags;
 208         nfs4_stateid            plh_stateid;
 209         u32                     plh_barrier; /* ignore lower seqids */
 210         u32                     plh_return_seq;
 211         enum pnfs_iomode        plh_return_iomode;
 212         loff_t                  plh_lwb; /* last write byte for layoutcommit */
 213         const struct cred       *plh_lc_cred; /* layoutcommit cred */
 214         struct inode            *plh_inode;
 215         struct rcu_head         plh_rcu;
 216 };
 217
 218 struct pnfs_device {
 219         struct nfs4_deviceid dev_id;
 220         unsigned int  layout_type;
 221         unsigned int  mincount;
 222         unsigned int  maxcount; /* gdia_maxcount */
 223         struct page **pages;
 224         unsigned int  pgbase;
 225         unsigned int  pglen;    /* reply buffer length */
 226         unsigned char nocache : 1;/* May not be cached */
 227 };
 228
 229 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16
 230
 231 struct pnfs_devicelist {
 232         unsigned int            eof;
 233         unsigned int            num_devs;
 234         struct nfs4_deviceid    dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM];
 235 };
 236
 237 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *);
 238 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *);
 239
 240 /* nfs4proc.c */
 241 extern size_t max_response_pages(struct nfs_server *server);
 242 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server,
 243                                    struct pnfs_device *dev,
 244                                    const struct cred *cred);
 245 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout);
 246 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync);
 247
 248 /* pnfs.c */
 249 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo);
 250 void pnfs_put_lseg(struct pnfs_layout_segment *lseg);
 251
 252 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *);
 253 void unset_pnfs_layoutdriver(struct nfs_server *);
 254 void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio);
 255 void pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req);
 256 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *);
 257 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
 258 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio,
 259                                 struct nfs_page *req, u64 wb_size);
 260 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *);
 261 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
 262 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio,
 263                             struct nfs_page *prev, struct nfs_page *req);
 264 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg);
 265 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp);
 266 void pnfs_layoutget_free(struct nfs4_layoutget *lgp);
 267 void pnfs_free_lseg_list(struct list_head *tmp_list);
 268 void pnfs_destroy_layout(struct nfs_inode *);
 269 void pnfs_destroy_all_layouts(struct nfs_client *);
 270 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp,
 271                 struct nfs_fsid *fsid,
 272                 bool is_recall);
 273 int pnfs_destroy_layouts_byclid(struct nfs_client *clp,
 274                 bool is_recall);
 275 bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
 276                 struct pnfs_layout_range *dst_range,
 277                 struct inode *inode);
 278 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo);
 279 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo,
 280                              const nfs4_stateid *new,
 281                              const struct cred *cred,
 282                              bool update_barrier);
 283 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo,
 284                                 struct list_head *tmp_list,
 285                                 const struct pnfs_layout_range *recall_range,
 286                                 u32 seq);
 287 int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo,
 288                                 struct list_head *tmp_list,
 289                                 const struct pnfs_layout_range *recall_range,
 290                                 u32 seq);
 291 int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo,
 292                 struct list_head *lseg_list);
 293 bool pnfs_roc(struct inode *ino,
 294                 struct nfs4_layoutreturn_args *args,
 295                 struct nfs4_layoutreturn_res *res,
 296                 const struct cred *cred);
 297 int pnfs_roc_done(struct rpc_task *task, struct inode *inode,
 298                 struct nfs4_layoutreturn_args **argpp,
 299                 struct nfs4_layoutreturn_res **respp,
 300                 int *ret);
 301 void pnfs_roc_release(struct nfs4_layoutreturn_args *args,
 302                 struct nfs4_layoutreturn_res *res,
 303                 int ret);
 304 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task);
 305 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t);
 306 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data);
 307 int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 308 int pnfs_generic_sync(struct inode *inode, bool datasync);
 309 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync);
 310 int _pnfs_return_layout(struct inode *);
 311 int pnfs_commit_and_return_layout(struct inode *);
 312 void pnfs_ld_write_done(struct nfs_pgio_header *);
 313 void pnfs_ld_read_done(struct nfs_pgio_header *);
 314 void pnfs_read_resend_pnfs(struct nfs_pgio_header *, unsigned int mirror_idx);
 315 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino,
 316                                                struct nfs_open_context *ctx,
 317                                                loff_t pos,
 318                                                u64 count,
 319                                                enum pnfs_iomode iomode,
 320                                                bool strict_iomode,
 321                                                gfp_t gfp_flags);
 322 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo,
 323                 const nfs4_stateid *arg_stateid,
 324                 const struct pnfs_layout_range *range,
 325                 const nfs4_stateid *stateid);
 326
 327 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo,
 328                    struct pnfs_layout_segment *lseg,
 329                    bool (*is_after)(const struct pnfs_layout_range *lseg_range,
 330                            const struct pnfs_layout_range *old),
 331                    bool (*do_merge)(struct pnfs_layout_segment *lseg,
 332                            struct pnfs_layout_segment *old),
 333                    struct list_head *free_me);
 334
 335 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp);
 336 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *);
 337 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *);
 338 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void);
 339 void pnfs_error_mark_layout_for_return(struct inode *inode,
 340                                        struct pnfs_layout_segment *lseg);
 341 void pnfs_layout_return_unused_byclid(struct nfs_client *clp,
 342                                       enum pnfs_iomode iomode);
 343
 344 /* nfs4_deviceid_flags */
 345 enum {
 346         NFS_DEVICEID_INVALID = 0,       /* set when MDS clientid recalled */
 347         NFS_DEVICEID_UNAVAILABLE,       /* device temporarily unavailable */
 348         NFS_DEVICEID_NOCACHE,           /* device may not be cached */
 349 };
 350
 351 /* pnfs_dev.c */
 352 struct nfs4_deviceid_node {
 353         struct hlist_node               node;
 354         struct hlist_node               tmpnode;
 355         const struct pnfs_layoutdriver_type *ld;
 356         const struct nfs_client         *nfs_client;
 357         unsigned long                   flags;
 358         unsigned long                   timestamp_unavailable;
 359         struct nfs4_deviceid            deviceid;
 360         struct rcu_head                 rcu;
 361         atomic_t                        ref;
 362 };
 363
 364 struct nfs4_deviceid_node *
 365 nfs4_find_get_deviceid(struct nfs_server *server,
 366                 const struct nfs4_deviceid *id, const struct cred *cred,
 367                 gfp_t gfp_mask);
 368 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *);
 369 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *,
 370                              const struct nfs4_deviceid *);
 371 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
 372 void nfs4_mark_deviceid_available(struct nfs4_deviceid_node *node);
 373 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node);
 374 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
 375 void nfs4_deviceid_purge_client(const struct nfs_client *);
 376
 377 /* pnfs_nfs.c */
 378 struct pnfs_commit_array *pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags);
 379 void pnfs_free_commit_array(struct pnfs_commit_array *p);
 380 struct pnfs_commit_array *pnfs_add_commit_array(struct pnfs_ds_commit_info *,
 381                                                 struct pnfs_commit_array *,
 382                                                 struct pnfs_layout_segment *);
 383
 384 void pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo,
 385                 struct pnfs_layout_segment *lseg);
 386 void pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo);
 387
 388 void pnfs_generic_clear_request_commit(struct nfs_page *req,
 389                                        struct nfs_commit_info *cinfo);
 390 void pnfs_generic_commit_release(void *calldata);
 391 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data);
 392 void pnfs_generic_rw_release(void *data);
 393 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
 394                                       struct nfs_commit_info *cinfo);
 395 struct nfs_page *pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo,
 396                                                  struct page *page);
 397 int pnfs_generic_commit_pagelist(struct inode *inode,
 398                                  struct list_head *mds_pages,
 399                                  int how,
 400                                  struct nfs_commit_info *cinfo,
 401                                  int (*initiate_commit)(struct nfs_commit_data *data,
 402                                                         int how));
 403 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max);
 404 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data);
 405 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds);
 406 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs,
 407                                       gfp_t gfp_flags);
 408 void nfs4_pnfs_v3_ds_connect_unload(void);
 409 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
 410                           struct nfs4_deviceid_node *devid, unsigned int timeo,
 411                           unsigned int retrans, u32 version, u32 minor_version);
 412 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net,
 413                                                  struct xdr_stream *xdr,
 414                                                  gfp_t gfp_flags);
 415 void pnfs_layout_mark_request_commit(struct nfs_page *req,
 416                                      struct pnfs_layout_segment *lseg,
 417                                      struct nfs_commit_info *cinfo,
 418                                      u32 ds_commit_idx);
 419 void pnfs_lgopen_prepare(struct nfs4_opendata *data,
 420                          struct nfs_open_context *ctx);
 421 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp,
 422                        struct nfs_open_context *ctx);
 423 void nfs4_lgopen_release(struct nfs4_layoutget *lgp);
 424
 425 static inline bool nfs_have_layout(struct inode *inode)
 426 {
 427         return NFS_I(inode)->layout != NULL;
 428 }
 429
 430 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
 431 {
 432         return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0;
 433 }
 434
 435 static inline struct nfs4_deviceid_node *
 436 nfs4_get_deviceid(struct nfs4_deviceid_node *d)
 437 {
 438         atomic_inc(&d->ref);
 439         return d;
 440 }
 441
 442 static inline struct pnfs_layout_segment *
 443 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 444 {
 445         if (lseg) {
 446                 refcount_inc(&lseg->pls_refcount);
 447                 smp_mb__after_atomic();
 448         }
 449         return lseg;
 450 }
 451
 452 static inline bool
 453 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg)
 454 {
 455         return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0;
 456 }
 457
 458 /* Return true if a layout driver is being used for this mountpoint */
 459 static inline int pnfs_enabled_sb(struct nfs_server *nfss)
 460 {
 461         return nfss->pnfs_curr_ld != NULL;
 462 }
 463
 464 static inline int
 465 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 466                  struct nfs_commit_info *cinfo)
 467 {
 468         struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
 469
 470         if (fl_cinfo == NULL || fl_cinfo->ncommitting == 0)
 471                 return PNFS_NOT_ATTEMPTED;
 472         return fl_cinfo->ops->commit_pagelist(inode, mds_pages, how, cinfo);
 473 }
 474
 475 static inline struct pnfs_ds_commit_info *
 476 pnfs_get_ds_info(struct inode *inode)
 477 {
 478         struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
 479
 480         if (ld == NULL || ld->get_ds_info == NULL)
 481                 return NULL;
 482         return ld->get_ds_info(inode);
 483 }
 484
 485 static inline void
 486 pnfs_init_ds_commit_info_ops(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
 487 {
 488         struct pnfs_ds_commit_info *inode_cinfo = pnfs_get_ds_info(inode);
 489         if (inode_cinfo != NULL)
 490                 fl_cinfo->ops = inode_cinfo->ops;
 491 }
 492
 493 static inline void
 494 pnfs_init_ds_commit_info(struct pnfs_ds_commit_info *fl_cinfo)
 495 {
 496         INIT_LIST_HEAD(&fl_cinfo->commits);
 497         fl_cinfo->ops = NULL;
 498 }
 499
 500 static inline void
 501 pnfs_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
 502 {
 503         if (fl_cinfo->ops != NULL && fl_cinfo->ops->release_ds_info != NULL)
 504                 fl_cinfo->ops->release_ds_info(fl_cinfo, inode);
 505 }
 506
 507 static inline void
 508 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node)
 509 {
 510         set_bit(NFS_DEVICEID_INVALID, &node->flags);
 511 }
 512
 513 static inline bool
 514 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 515                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 516 {
 517         struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
 518
 519         if (!lseg || !fl_cinfo->ops->mark_request_commit)
 520                 return false;
 521         fl_cinfo->ops->mark_request_commit(req, lseg, cinfo, ds_commit_idx);
 522         return true;
 523 }
 524
 525 static inline bool
 526 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 527 {
 528         struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
 529
 530         if (!fl_cinfo || !fl_cinfo->ops || !fl_cinfo->ops->clear_request_commit)
 531                 return false;
 532         fl_cinfo->ops->clear_request_commit(req, cinfo);
 533         return true;
 534 }
 535
 536 static inline int
 537 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 538                        int max)
 539 {
 540         struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
 541
 542         if (!fl_cinfo || fl_cinfo->nwritten == 0)
 543                 return 0;
 544         return fl_cinfo->ops->scan_commit_lists(cinfo, max);
 545 }
 546
 547 static inline void
 548 pnfs_recover_commit_reqs(struct list_head *head, struct nfs_commit_info *cinfo)
 549 {
 550         struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
 551
 552         if (fl_cinfo && fl_cinfo->nwritten != 0)
 553                 fl_cinfo->ops->recover_commit_reqs(head, cinfo);
 554 }
 555
 556 static inline struct nfs_page *
 557 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 558                         struct page *page)
 559 {
 560         struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
 561
 562         if (!fl_cinfo->ops || !fl_cinfo->ops->search_commit_reqs)
 563                 return NULL;
 564         return fl_cinfo->ops->search_commit_reqs(cinfo, page);
 565 }
 566
 567 /* Should the pNFS client commit and return the layout upon a setattr */
 568 static inline bool
 569 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 570 {
 571         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 572                 return false;
 573         return NFS_SERVER(inode)->pnfs_curr_ld->flags &
 574                 PNFS_LAYOUTRET_ON_SETATTR;
 575 }
 576
 577 static inline bool
 578 pnfs_ld_read_whole_page(struct inode *inode)
 579 {
 580         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 581                 return false;
 582         return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE;
 583 }
 584
 585 static inline int
 586 pnfs_sync_inode(struct inode *inode, bool datasync)
 587 {
 588         if (!pnfs_enabled_sb(NFS_SERVER(inode)))
 589                 return 0;
 590         return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync);
 591 }
 592
 593 static inline bool
 594 pnfs_layoutcommit_outstanding(struct inode *inode)
 595 {
 596         struct nfs_inode *nfsi = NFS_I(inode);
 597
 598         return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 ||
 599                 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0;
 600 }
 601
 602 static inline int pnfs_return_layout(struct inode *ino)
 603 {
 604         struct nfs_inode *nfsi = NFS_I(ino);
 605         struct nfs_server *nfss = NFS_SERVER(ino);
 606
 607         if (pnfs_enabled_sb(nfss) && nfsi->layout) {
 608                 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &nfsi->layout->plh_flags);
 609                 return _pnfs_return_layout(ino);
 610         }
 611
 612         return 0;
 613 }
 614
 615 static inline bool
 616 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 617                    struct nfs_server *nfss)
 618 {
 619         return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld &&
 620                                         nfss->pnfs_curr_ld->id == src->l_type);
 621 }
 622
 623 static inline u64
 624 pnfs_calc_offset_end(u64 offset, u64 len)
 625 {
 626         if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset)
 627                 return NFS4_MAX_UINT64;
 628         return offset + len - 1;
 629 }
 630
 631 static inline u64
 632 pnfs_calc_offset_length(u64 offset, u64 end)
 633 {
 634         if (end == NFS4_MAX_UINT64 || end <= offset)
 635                 return NFS4_MAX_UINT64;
 636         return 1 + end - offset;
 637 }
 638
 639 static inline void
 640 pnfs_copy_range(struct pnfs_layout_range *dst,
 641                 const struct pnfs_layout_range *src)
 642 {
 643         memcpy(dst, src, sizeof(*dst));
 644 }
 645
 646 static inline u64
 647 pnfs_end_offset(u64 start, u64 len)
 648 {
 649         if (NFS4_MAX_UINT64 - start <= len)
 650                 return NFS4_MAX_UINT64;
 651         return start + len;
 652 }
 653
 654 /*
 655  * Are 2 ranges intersecting?
 656  *   start1                             end1
 657  *   [----------------------------------)
 658  *                                start2           end2
 659  *                                [----------------)
 660  */
 661 static inline bool
 662 pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2)
 663 {
 664         return (end1 == NFS4_MAX_UINT64 || start2 < end1) &&
 665                 (end2 == NFS4_MAX_UINT64 || start1 < end2);
 666 }
 667
 668 static inline bool
 669 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1,
 670                 const struct pnfs_layout_range *l2)
 671 {
 672         u64 end1 = pnfs_end_offset(l1->offset, l1->length);
 673         u64 end2 = pnfs_end_offset(l2->offset, l2->length);
 674
 675         return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2);
 676 }
 677
 678 static inline bool
 679 pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req)
 680 {
 681         u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length);
 682         u64 req_last = req_offset(req) + req->wb_bytes;
 683
 684         return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last,
 685                                 req_offset(req), req_last);
 686 }
 687
 688 extern unsigned int layoutstats_timer;
 689
 690 #ifdef NFS_DEBUG
 691 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 692 #else
 693 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id)
 694 {
 695 }
 696
 697 #endif /* NFS_DEBUG */
 698 #else  /* CONFIG_NFS_V4_1 */
 699
 700 static inline bool nfs_have_layout(struct inode *inode)
 701 {
 702         return false;
 703 }
 704
 705 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
 706 {
 707 }
 708
 709 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi)
 710 {
 711 }
 712
 713 static inline struct pnfs_layout_segment *
 714 pnfs_get_lseg(struct pnfs_layout_segment *lseg)
 715 {
 716         return NULL;
 717 }
 718
 719 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg)
 720 {
 721 }
 722
 723 static inline int pnfs_return_layout(struct inode *ino)
 724 {
 725         return 0;
 726 }
 727
 728 static inline int pnfs_commit_and_return_layout(struct inode *inode)
 729 {
 730         return 0;
 731 }
 732
 733 static inline bool
 734 pnfs_ld_layoutret_on_setattr(struct inode *inode)
 735 {
 736         return false;
 737 }
 738
 739 static inline bool
 740 pnfs_ld_read_whole_page(struct inode *inode)
 741 {
 742         return false;
 743 }
 744
 745 static inline int
 746 pnfs_sync_inode(struct inode *inode, bool datasync)
 747 {
 748         return 0;
 749 }
 750
 751 static inline bool
 752 pnfs_layoutcommit_outstanding(struct inode *inode)
 753 {
 754         return false;
 755 }
 756
 757
 758 static inline bool
 759 pnfs_roc(struct inode *ino,
 760                 struct nfs4_layoutreturn_args *args,
 761                 struct nfs4_layoutreturn_res *res,
 762                 const struct cred *cred)
 763 {
 764         return false;
 765 }
 766
 767 static inline int
 768 pnfs_roc_done(struct rpc_task *task, struct inode *inode,
 769                 struct nfs4_layoutreturn_args **argpp,
 770                 struct nfs4_layoutreturn_res **respp,
 771                 int *ret)
 772 {
 773         return 0;
 774 }
 775
 776 static inline void
 777 pnfs_roc_release(struct nfs4_layoutreturn_args *args,
 778                 struct nfs4_layoutreturn_res *res,
 779                 int ret)
 780 {
 781 }
 782
 783 static inline bool
 784 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task)
 785 {
 786         return false;
 787 }
 788
 789 static inline void set_pnfs_layoutdriver(struct nfs_server *s,
 790                                          const struct nfs_fh *mntfh,
 791                                          struct nfs_fsinfo *fsinfo)
 792 {
 793 }
 794
 795 static inline void unset_pnfs_layoutdriver(struct nfs_server *s)
 796 {
 797 }
 798
 799 static inline int
 800 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how,
 801                  struct nfs_commit_info *cinfo)
 802 {
 803         return PNFS_NOT_ATTEMPTED;
 804 }
 805
 806 static inline struct pnfs_ds_commit_info *
 807 pnfs_get_ds_info(struct inode *inode)
 808 {
 809         return NULL;
 810 }
 811
 812 static inline void
 813 pnfs_init_ds_commit_info_ops(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
 814 {
 815 }
 816
 817 static inline void
 818 pnfs_init_ds_commit_info(struct pnfs_ds_commit_info *fl_cinfo)
 819 {
 820 }
 821
 822 static inline void
 823 pnfs_release_ds_info(struct pnfs_ds_commit_info *fl_cinfo, struct inode *inode)
 824 {
 825 }
 826
 827 static inline bool
 828 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
 829                          struct nfs_commit_info *cinfo, u32 ds_commit_idx)
 830 {
 831         return false;
 832 }
 833
 834 static inline bool
 835 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo)
 836 {
 837         return false;
 838 }
 839
 840 static inline int
 841 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo,
 842                        int max)
 843 {
 844         return 0;
 845 }
 846
 847 static inline void
 848 pnfs_recover_commit_reqs(struct list_head *head, struct nfs_commit_info *cinfo)
 849 {
 850 }
 851
 852 static inline struct nfs_page *
 853 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo,
 854                         struct page *page)
 855 {
 856         return NULL;
 857 }
 858
 859 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 860 {
 861         return 0;
 862 }
 863
 864 static inline bool
 865 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src,
 866                    struct nfs_server *nfss)
 867 {
 868         return false;
 869 }
 870
 871 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
 872 {
 873         return NULL;
 874 }
 875
 876 static inline void nfs4_pnfs_v3_ds_connect_unload(void)
 877 {
 878 }
 879
 880 static inline bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst,
 881                 struct pnfs_layout_range *dst_range,
 882                 struct inode *inode)
 883 {
 884         return false;
 885 }
 886
 887 static inline void pnfs_lgopen_prepare(struct nfs4_opendata *data,
 888                 struct nfs_open_context *ctx)
 889 {
 890 }
 891
 892 static inline void pnfs_parse_lgopen(struct inode *ino,
 893                 struct nfs4_layoutget *lgp,
 894                 struct nfs_open_context *ctx)
 895 {
 896 }
 897
 898 static inline void nfs4_lgopen_release(struct nfs4_layoutget *lgp)
 899 {
 900 }
 901
 902 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo)
 903 {
 904         return false;
 905 }
 906
 907 #endif /* CONFIG_NFS_V4_1 */
 908
 909 #if IS_ENABLED(CONFIG_NFS_V4_2)
 910 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags);
 911 #else
 912 static inline int
 913 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags)
 914 {
 915         return 0;
 916 }
 917 #endif
 918
 919 #endif /* FS_NFS_PNFS_H */