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, /* Return this layout ASAP */ 98 NFS_LAYOUT_RETURN_BEFORE_CLOSE, /* Return this layout before close */ 99 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */ 100 NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */ 101 NFS_LAYOUT_RETRY_LAYOUTGET, /* Retry layoutget */ 102 }; 103 104 enum layoutdriver_policy_flags { 105 /* Should the pNFS client commit and return the layout upon truncate to 106 * a smaller size */ 107 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0, 108 PNFS_LAYOUTRET_ON_ERROR = 1 << 1, 109 PNFS_READ_WHOLE_PAGE = 1 << 2, 110 }; 111 112 struct nfs4_deviceid_node; 113 114 /* Per-layout driver specific registration structure */ 115 struct pnfs_layoutdriver_type { 116 struct list_head pnfs_tblid; 117 const u32 id; 118 const char *name; 119 struct module *owner; 120 unsigned flags; 121 unsigned max_deviceinfo_size; 122 123 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *); 124 int (*clear_layoutdriver) (struct nfs_server *); 125 126 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags); 127 void (*free_layout_hdr) (struct pnfs_layout_hdr *); 128 129 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); 130 void (*free_lseg) (struct pnfs_layout_segment *lseg); 131 void (*add_lseg) (struct pnfs_layout_hdr *layoutid, 132 struct pnfs_layout_segment *lseg, 133 struct list_head *free_me); 134 135 void (*return_range) (struct pnfs_layout_hdr *lo, 136 struct pnfs_layout_range *range); 137 138 /* test for nfs page cache coalescing */ 139 const struct nfs_pageio_ops *pg_read_ops; 140 const struct nfs_pageio_ops *pg_write_ops; 141 142 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode); 143 void (*mark_request_commit) (struct nfs_page *req, 144 struct pnfs_layout_segment *lseg, 145 struct nfs_commit_info *cinfo, 146 u32 ds_commit_idx); 147 void (*clear_request_commit) (struct nfs_page *req, 148 struct nfs_commit_info *cinfo); 149 int (*scan_commit_lists) (struct nfs_commit_info *cinfo, 150 int max); 151 void (*recover_commit_reqs) (struct list_head *list, 152 struct nfs_commit_info *cinfo); 153 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo, 154 struct page *page); 155 int (*commit_pagelist)(struct inode *inode, 156 struct list_head *mds_pages, 157 int how, 158 struct nfs_commit_info *cinfo); 159 160 int (*sync)(struct inode *inode, bool datasync); 161 162 /* 163 * Return PNFS_ATTEMPTED to indicate the layout code has attempted 164 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS 165 */ 166 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *); 167 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int); 168 169 void (*free_deviceid_node) (struct nfs4_deviceid_node *); 170 struct nfs4_deviceid_node * (*alloc_deviceid_node) 171 (struct nfs_server *server, struct pnfs_device *pdev, 172 gfp_t gfp_flags); 173 174 void (*encode_layoutreturn) (struct pnfs_layout_hdr *layoutid, 175 struct xdr_stream *xdr, 176 const struct nfs4_layoutreturn_args *args); 177 178 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data); 179 int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args); 180 void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo, 181 struct xdr_stream *xdr, 182 const struct nfs4_layoutcommit_args *args); 183 int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args); 184 void (*cleanup_layoutstats) (struct nfs42_layoutstat_data *data); 185 }; 186 187 struct pnfs_layout_hdr { 188 atomic_t plh_refcount; 189 atomic_t plh_outstanding; /* number of RPCs out */ 190 struct list_head plh_layouts; /* other client layouts */ 191 struct list_head plh_bulk_destroy; 192 struct list_head plh_segs; /* layout segments list */ 193 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */ 194 unsigned long plh_retry_timestamp; 195 unsigned long plh_flags; 196 nfs4_stateid plh_stateid; 197 u32 plh_barrier; /* ignore lower seqids */ 198 enum pnfs_iomode plh_return_iomode; 199 loff_t plh_lwb; /* last write byte for layoutcommit */ 200 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */ 201 struct inode *plh_inode; 202 }; 203 204 struct pnfs_device { 205 struct nfs4_deviceid dev_id; 206 unsigned int layout_type; 207 unsigned int mincount; 208 unsigned int maxcount; /* gdia_maxcount */ 209 struct page **pages; 210 unsigned int pgbase; 211 unsigned int pglen; /* reply buffer length */ 212 unsigned char nocache : 1;/* May not be cached */ 213 }; 214 215 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16 216 217 struct pnfs_devicelist { 218 unsigned int eof; 219 unsigned int num_devs; 220 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM]; 221 }; 222 223 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *); 224 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *); 225 226 /* nfs4proc.c */ 227 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server, 228 struct pnfs_device *dev, 229 struct rpc_cred *cred); 230 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags); 231 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync); 232 233 /* pnfs.c */ 234 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo); 235 void pnfs_put_lseg(struct pnfs_layout_segment *lseg); 236 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg); 237 238 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32); 239 void unset_pnfs_layoutdriver(struct nfs_server *); 240 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *); 241 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc); 242 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 243 struct nfs_page *req, u64 wb_size); 244 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *); 245 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc); 246 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 247 struct nfs_page *prev, struct nfs_page *req); 248 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg); 249 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp); 250 void pnfs_free_lseg_list(struct list_head *tmp_list); 251 void pnfs_destroy_layout(struct nfs_inode *); 252 void pnfs_destroy_all_layouts(struct nfs_client *); 253 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp, 254 struct nfs_fsid *fsid, 255 bool is_recall); 256 int pnfs_destroy_layouts_byclid(struct nfs_client *clp, 257 bool is_recall); 258 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo); 259 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, 260 const nfs4_stateid *new, 261 bool update_barrier); 262 int pnfs_choose_layoutget_stateid(nfs4_stateid *dst, 263 struct pnfs_layout_hdr *lo, 264 struct pnfs_layout_range *range, 265 struct nfs4_state *open_state); 266 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 267 struct list_head *tmp_list, 268 struct pnfs_layout_range *recall_range); 269 bool pnfs_roc(struct inode *ino); 270 void pnfs_roc_release(struct inode *ino); 271 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier); 272 void pnfs_roc_get_barrier(struct inode *ino, u32 *barrier); 273 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t); 274 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data); 275 int pnfs_layoutcommit_inode(struct inode *inode, bool sync); 276 int pnfs_generic_sync(struct inode *inode, bool datasync); 277 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync); 278 int _pnfs_return_layout(struct inode *); 279 int pnfs_commit_and_return_layout(struct inode *); 280 void pnfs_ld_write_done(struct nfs_pgio_header *); 281 void pnfs_ld_read_done(struct nfs_pgio_header *); 282 int pnfs_read_resend_pnfs(struct nfs_pgio_header *); 283 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino, 284 struct nfs_open_context *ctx, 285 loff_t pos, 286 u64 count, 287 enum pnfs_iomode iomode, 288 gfp_t gfp_flags); 289 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo); 290 291 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 292 struct pnfs_layout_segment *lseg, 293 bool (*is_after)(const struct pnfs_layout_range *lseg_range, 294 const struct pnfs_layout_range *old), 295 bool (*do_merge)(struct pnfs_layout_segment *lseg, 296 struct pnfs_layout_segment *old), 297 struct list_head *free_me); 298 299 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp); 300 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *); 301 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *); 302 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void); 303 void pnfs_error_mark_layout_for_return(struct inode *inode, 304 struct pnfs_layout_segment *lseg); 305 /* nfs4_deviceid_flags */ 306 enum { 307 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */ 308 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */ 309 NFS_DEVICEID_NOCACHE, /* device may not be cached */ 310 }; 311 312 /* pnfs_dev.c */ 313 struct nfs4_deviceid_node { 314 struct hlist_node node; 315 struct hlist_node tmpnode; 316 const struct pnfs_layoutdriver_type *ld; 317 const struct nfs_client *nfs_client; 318 unsigned long flags; 319 unsigned long timestamp_unavailable; 320 struct nfs4_deviceid deviceid; 321 struct rcu_head rcu; 322 atomic_t ref; 323 }; 324 325 struct nfs4_deviceid_node * 326 nfs4_find_get_deviceid(struct nfs_server *server, 327 const struct nfs4_deviceid *id, struct rpc_cred *cred, 328 gfp_t gfp_mask); 329 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); 330 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *, 331 const struct nfs4_deviceid *); 332 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *); 333 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node); 334 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node); 335 void nfs4_deviceid_purge_client(const struct nfs_client *); 336 337 /* pnfs_nfs.c */ 338 void pnfs_generic_clear_request_commit(struct nfs_page *req, 339 struct nfs_commit_info *cinfo); 340 void pnfs_generic_commit_release(void *calldata); 341 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data); 342 void pnfs_generic_rw_release(void *data); 343 void pnfs_generic_recover_commit_reqs(struct list_head *dst, 344 struct nfs_commit_info *cinfo); 345 int pnfs_generic_commit_pagelist(struct inode *inode, 346 struct list_head *mds_pages, 347 int how, 348 struct nfs_commit_info *cinfo, 349 int (*initiate_commit)(struct nfs_commit_data *data, 350 int how)); 351 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max); 352 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data); 353 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds); 354 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs, 355 gfp_t gfp_flags); 356 void nfs4_pnfs_v3_ds_connect_unload(void); 357 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 358 struct nfs4_deviceid_node *devid, unsigned int timeo, 359 unsigned int retrans, u32 version, u32 minor_version, 360 rpc_authflavor_t au_flavor); 361 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net, 362 struct xdr_stream *xdr, 363 gfp_t gfp_flags); 364 void pnfs_layout_mark_request_commit(struct nfs_page *req, 365 struct pnfs_layout_segment *lseg, 366 struct nfs_commit_info *cinfo, 367 u32 ds_commit_idx); 368 369 static inline bool nfs_have_layout(struct inode *inode) 370 { 371 return NFS_I(inode)->layout != NULL; 372 } 373 374 static inline struct nfs4_deviceid_node * 375 nfs4_get_deviceid(struct nfs4_deviceid_node *d) 376 { 377 atomic_inc(&d->ref); 378 return d; 379 } 380 381 static inline void pnfs_set_retry_layoutget(struct pnfs_layout_hdr *lo) 382 { 383 if (!test_and_set_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags)) 384 atomic_inc(&lo->plh_refcount); 385 } 386 387 static inline void pnfs_clear_retry_layoutget(struct pnfs_layout_hdr *lo) 388 { 389 if (test_and_clear_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags)) { 390 atomic_dec(&lo->plh_refcount); 391 /* wake up waiters for LAYOUTRETURN as that is not needed */ 392 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); 393 } 394 } 395 396 static inline bool pnfs_should_retry_layoutget(struct pnfs_layout_hdr *lo) 397 { 398 return test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags); 399 } 400 401 static inline struct pnfs_layout_segment * 402 pnfs_get_lseg(struct pnfs_layout_segment *lseg) 403 { 404 if (lseg) { 405 atomic_inc(&lseg->pls_refcount); 406 smp_mb__after_atomic(); 407 } 408 return lseg; 409 } 410 411 /* Return true if a layout driver is being used for this mountpoint */ 412 static inline int pnfs_enabled_sb(struct nfs_server *nfss) 413 { 414 return nfss->pnfs_curr_ld != NULL; 415 } 416 417 static inline int 418 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how, 419 struct nfs_commit_info *cinfo) 420 { 421 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0) 422 return PNFS_NOT_ATTEMPTED; 423 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo); 424 } 425 426 static inline struct pnfs_ds_commit_info * 427 pnfs_get_ds_info(struct inode *inode) 428 { 429 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 430 431 if (ld == NULL || ld->get_ds_info == NULL) 432 return NULL; 433 return ld->get_ds_info(inode); 434 } 435 436 static inline void 437 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node) 438 { 439 set_bit(NFS_DEVICEID_INVALID, &node->flags); 440 } 441 442 static inline bool 443 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 444 struct nfs_commit_info *cinfo, u32 ds_commit_idx) 445 { 446 struct inode *inode = d_inode(req->wb_context->dentry); 447 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 448 449 if (lseg == NULL || ld->mark_request_commit == NULL) 450 return false; 451 ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx); 452 return true; 453 } 454 455 static inline bool 456 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo) 457 { 458 struct inode *inode = d_inode(req->wb_context->dentry); 459 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 460 461 if (ld == NULL || ld->clear_request_commit == NULL) 462 return false; 463 ld->clear_request_commit(req, cinfo); 464 return true; 465 } 466 467 static inline int 468 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo, 469 int max) 470 { 471 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0) 472 return 0; 473 else 474 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max); 475 } 476 477 static inline struct nfs_page * 478 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo, 479 struct page *page) 480 { 481 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 482 483 if (ld == NULL || ld->search_commit_reqs == NULL) 484 return NULL; 485 return ld->search_commit_reqs(cinfo, page); 486 } 487 488 /* Should the pNFS client commit and return the layout upon a setattr */ 489 static inline bool 490 pnfs_ld_layoutret_on_setattr(struct inode *inode) 491 { 492 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 493 return false; 494 return NFS_SERVER(inode)->pnfs_curr_ld->flags & 495 PNFS_LAYOUTRET_ON_SETATTR; 496 } 497 498 static inline bool 499 pnfs_ld_read_whole_page(struct inode *inode) 500 { 501 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 502 return false; 503 return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE; 504 } 505 506 static inline int 507 pnfs_sync_inode(struct inode *inode, bool datasync) 508 { 509 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 510 return 0; 511 return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync); 512 } 513 514 static inline bool 515 pnfs_layoutcommit_outstanding(struct inode *inode) 516 { 517 struct nfs_inode *nfsi = NFS_I(inode); 518 519 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 || 520 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0; 521 } 522 523 static inline int pnfs_return_layout(struct inode *ino) 524 { 525 struct nfs_inode *nfsi = NFS_I(ino); 526 struct nfs_server *nfss = NFS_SERVER(ino); 527 528 if (pnfs_enabled_sb(nfss) && nfsi->layout) 529 return _pnfs_return_layout(ino); 530 531 return 0; 532 } 533 534 static inline bool 535 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src, 536 struct nfs_server *nfss) 537 { 538 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld && 539 nfss->pnfs_curr_ld->id == src->l_type); 540 } 541 542 static inline u64 543 pnfs_calc_offset_end(u64 offset, u64 len) 544 { 545 if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset) 546 return NFS4_MAX_UINT64; 547 return offset + len - 1; 548 } 549 550 static inline u64 551 pnfs_calc_offset_length(u64 offset, u64 end) 552 { 553 if (end == NFS4_MAX_UINT64 || end <= offset) 554 return NFS4_MAX_UINT64; 555 return 1 + end - offset; 556 } 557 558 extern unsigned int layoutstats_timer; 559 560 #ifdef NFS_DEBUG 561 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id); 562 #else 563 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id) 564 { 565 } 566 567 #endif /* NFS_DEBUG */ 568 #else /* CONFIG_NFS_V4_1 */ 569 570 static inline bool nfs_have_layout(struct inode *inode) 571 { 572 return false; 573 } 574 575 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp) 576 { 577 } 578 579 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi) 580 { 581 } 582 583 static inline struct pnfs_layout_segment * 584 pnfs_get_lseg(struct pnfs_layout_segment *lseg) 585 { 586 return NULL; 587 } 588 589 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg) 590 { 591 } 592 593 static inline int pnfs_return_layout(struct inode *ino) 594 { 595 return 0; 596 } 597 598 static inline int pnfs_commit_and_return_layout(struct inode *inode) 599 { 600 return 0; 601 } 602 603 static inline bool 604 pnfs_ld_layoutret_on_setattr(struct inode *inode) 605 { 606 return false; 607 } 608 609 static inline bool 610 pnfs_ld_read_whole_page(struct inode *inode) 611 { 612 return false; 613 } 614 615 static inline int 616 pnfs_sync_inode(struct inode *inode, bool datasync) 617 { 618 return 0; 619 } 620 621 static inline bool 622 pnfs_roc(struct inode *ino) 623 { 624 return false; 625 } 626 627 static inline void 628 pnfs_roc_release(struct inode *ino) 629 { 630 } 631 632 static inline void 633 pnfs_roc_set_barrier(struct inode *ino, u32 barrier) 634 { 635 } 636 637 static inline void 638 pnfs_roc_get_barrier(struct inode *ino, u32 *barrier) 639 { 640 } 641 642 static inline void set_pnfs_layoutdriver(struct nfs_server *s, 643 const struct nfs_fh *mntfh, u32 id) 644 { 645 } 646 647 static inline void unset_pnfs_layoutdriver(struct nfs_server *s) 648 { 649 } 650 651 static inline int 652 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how, 653 struct nfs_commit_info *cinfo) 654 { 655 return PNFS_NOT_ATTEMPTED; 656 } 657 658 static inline struct pnfs_ds_commit_info * 659 pnfs_get_ds_info(struct inode *inode) 660 { 661 return NULL; 662 } 663 664 static inline bool 665 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 666 struct nfs_commit_info *cinfo, u32 ds_commit_idx) 667 { 668 return false; 669 } 670 671 static inline bool 672 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo) 673 { 674 return false; 675 } 676 677 static inline int 678 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo, 679 int max) 680 { 681 return 0; 682 } 683 684 static inline struct nfs_page * 685 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo, 686 struct page *page) 687 { 688 return NULL; 689 } 690 691 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync) 692 { 693 return 0; 694 } 695 696 static inline bool 697 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src, 698 struct nfs_server *nfss) 699 { 700 return false; 701 } 702 703 static inline bool 704 pnfs_layoutcommit_outstanding(struct inode *inode) 705 { 706 return false; 707 } 708 709 710 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 711 { 712 return NULL; 713 } 714 715 static inline void nfs4_pnfs_v3_ds_connect_unload(void) 716 { 717 } 718 719 #endif /* CONFIG_NFS_V4_1 */ 720 721 #if IS_ENABLED(CONFIG_NFS_V4_2) 722 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags); 723 #else 724 static inline int 725 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 726 { 727 return 0; 728 } 729 #endif 730 731 #endif /* FS_NFS_PNFS_H */ 732