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 u32 pls_seq; 68 unsigned long pls_flags; 69 struct pnfs_layout_hdr *pls_layout; 70 struct work_struct pls_work; 71 }; 72 73 enum pnfs_try_status { 74 PNFS_ATTEMPTED = 0, 75 PNFS_NOT_ATTEMPTED = 1, 76 PNFS_TRY_AGAIN = 2, 77 }; 78 79 #ifdef CONFIG_NFS_V4_1 80 81 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4" 82 83 /* 84 * Default data server connection timeout and retrans vaules. 85 * Set by module parameters dataserver_timeo and dataserver_retrans. 86 */ 87 #define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */ 88 #define NFS4_DEF_DS_RETRANS 5 89 90 /* error codes for internal use */ 91 #define NFS4ERR_RESET_TO_MDS 12001 92 #define NFS4ERR_RESET_TO_PNFS 12002 93 94 enum { 95 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */ 96 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */ 97 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */ 98 NFS_LAYOUT_RETURN, /* layoutreturn in progress */ 99 NFS_LAYOUT_RETURN_REQUESTED, /* Return this layout ASAP */ 100 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */ 101 NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first 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 u32 plh_return_seq; 199 enum pnfs_iomode plh_return_iomode; 200 loff_t plh_lwb; /* last write byte for layoutcommit */ 201 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */ 202 struct inode *plh_inode; 203 }; 204 205 struct pnfs_device { 206 struct nfs4_deviceid dev_id; 207 unsigned int layout_type; 208 unsigned int mincount; 209 unsigned int maxcount; /* gdia_maxcount */ 210 struct page **pages; 211 unsigned int pgbase; 212 unsigned int pglen; /* reply buffer length */ 213 unsigned char nocache : 1;/* May not be cached */ 214 }; 215 216 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16 217 218 struct pnfs_devicelist { 219 unsigned int eof; 220 unsigned int num_devs; 221 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM]; 222 }; 223 224 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *); 225 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *); 226 227 /* nfs4proc.c */ 228 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server, 229 struct pnfs_device *dev, 230 struct rpc_cred *cred); 231 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags); 232 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync); 233 234 /* pnfs.c */ 235 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo); 236 void pnfs_put_lseg(struct pnfs_layout_segment *lseg); 237 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg); 238 239 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32); 240 void unset_pnfs_layoutdriver(struct nfs_server *); 241 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *); 242 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc); 243 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 244 struct nfs_page *req, u64 wb_size); 245 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *); 246 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc); 247 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 248 struct nfs_page *prev, struct nfs_page *req); 249 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg); 250 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp); 251 void pnfs_free_lseg_list(struct list_head *tmp_list); 252 void pnfs_destroy_layout(struct nfs_inode *); 253 void pnfs_destroy_all_layouts(struct nfs_client *); 254 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp, 255 struct nfs_fsid *fsid, 256 bool is_recall); 257 int pnfs_destroy_layouts_byclid(struct nfs_client *clp, 258 bool is_recall); 259 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo); 260 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, 261 const nfs4_stateid *new, 262 bool update_barrier); 263 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 264 struct list_head *tmp_list, 265 const struct pnfs_layout_range *recall_range, 266 u32 seq); 267 int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 268 struct list_head *tmp_list, 269 const struct pnfs_layout_range *recall_range, 270 u32 seq); 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 void 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 bool strict_iomode, 292 gfp_t gfp_flags); 293 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo); 294 295 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 296 struct pnfs_layout_segment *lseg, 297 bool (*is_after)(const struct pnfs_layout_range *lseg_range, 298 const struct pnfs_layout_range *old), 299 bool (*do_merge)(struct pnfs_layout_segment *lseg, 300 struct pnfs_layout_segment *old), 301 struct list_head *free_me); 302 303 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp); 304 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *); 305 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *); 306 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void); 307 void pnfs_error_mark_layout_for_return(struct inode *inode, 308 struct pnfs_layout_segment *lseg); 309 /* nfs4_deviceid_flags */ 310 enum { 311 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */ 312 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */ 313 NFS_DEVICEID_NOCACHE, /* device may not be cached */ 314 }; 315 316 /* pnfs_dev.c */ 317 struct nfs4_deviceid_node { 318 struct hlist_node node; 319 struct hlist_node tmpnode; 320 const struct pnfs_layoutdriver_type *ld; 321 const struct nfs_client *nfs_client; 322 unsigned long flags; 323 unsigned long timestamp_unavailable; 324 struct nfs4_deviceid deviceid; 325 struct rcu_head rcu; 326 atomic_t ref; 327 }; 328 329 struct nfs4_deviceid_node * 330 nfs4_find_get_deviceid(struct nfs_server *server, 331 const struct nfs4_deviceid *id, struct rpc_cred *cred, 332 gfp_t gfp_mask); 333 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); 334 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *, 335 const struct nfs4_deviceid *); 336 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *); 337 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node); 338 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node); 339 void nfs4_deviceid_purge_client(const struct nfs_client *); 340 341 /* pnfs_nfs.c */ 342 void pnfs_generic_clear_request_commit(struct nfs_page *req, 343 struct nfs_commit_info *cinfo); 344 void pnfs_generic_commit_release(void *calldata); 345 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data); 346 void pnfs_generic_rw_release(void *data); 347 void pnfs_generic_recover_commit_reqs(struct list_head *dst, 348 struct nfs_commit_info *cinfo); 349 int pnfs_generic_commit_pagelist(struct inode *inode, 350 struct list_head *mds_pages, 351 int how, 352 struct nfs_commit_info *cinfo, 353 int (*initiate_commit)(struct nfs_commit_data *data, 354 int how)); 355 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max); 356 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data); 357 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds); 358 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs, 359 gfp_t gfp_flags); 360 void nfs4_pnfs_v3_ds_connect_unload(void); 361 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 362 struct nfs4_deviceid_node *devid, unsigned int timeo, 363 unsigned int retrans, u32 version, u32 minor_version, 364 rpc_authflavor_t au_flavor); 365 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net, 366 struct xdr_stream *xdr, 367 gfp_t gfp_flags); 368 void pnfs_layout_mark_request_commit(struct nfs_page *req, 369 struct pnfs_layout_segment *lseg, 370 struct nfs_commit_info *cinfo, 371 u32 ds_commit_idx); 372 373 static inline bool nfs_have_layout(struct inode *inode) 374 { 375 return NFS_I(inode)->layout != NULL; 376 } 377 378 static inline struct nfs4_deviceid_node * 379 nfs4_get_deviceid(struct nfs4_deviceid_node *d) 380 { 381 atomic_inc(&d->ref); 382 return d; 383 } 384 385 static inline struct pnfs_layout_segment * 386 pnfs_get_lseg(struct pnfs_layout_segment *lseg) 387 { 388 if (lseg) { 389 atomic_inc(&lseg->pls_refcount); 390 smp_mb__after_atomic(); 391 } 392 return lseg; 393 } 394 395 static inline bool 396 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg) 397 { 398 return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0; 399 } 400 401 /* Return true if a layout driver is being used for this mountpoint */ 402 static inline int pnfs_enabled_sb(struct nfs_server *nfss) 403 { 404 return nfss->pnfs_curr_ld != NULL; 405 } 406 407 static inline int 408 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how, 409 struct nfs_commit_info *cinfo) 410 { 411 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0) 412 return PNFS_NOT_ATTEMPTED; 413 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo); 414 } 415 416 static inline struct pnfs_ds_commit_info * 417 pnfs_get_ds_info(struct inode *inode) 418 { 419 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 420 421 if (ld == NULL || ld->get_ds_info == NULL) 422 return NULL; 423 return ld->get_ds_info(inode); 424 } 425 426 static inline void 427 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node) 428 { 429 set_bit(NFS_DEVICEID_INVALID, &node->flags); 430 } 431 432 static inline bool 433 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 434 struct nfs_commit_info *cinfo, u32 ds_commit_idx) 435 { 436 struct inode *inode = d_inode(req->wb_context->dentry); 437 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 438 439 if (lseg == NULL || ld->mark_request_commit == NULL) 440 return false; 441 ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx); 442 return true; 443 } 444 445 static inline bool 446 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo) 447 { 448 struct inode *inode = d_inode(req->wb_context->dentry); 449 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 450 451 if (ld == NULL || ld->clear_request_commit == NULL) 452 return false; 453 ld->clear_request_commit(req, cinfo); 454 return true; 455 } 456 457 static inline int 458 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo, 459 int max) 460 { 461 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0) 462 return 0; 463 else 464 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max); 465 } 466 467 static inline struct nfs_page * 468 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo, 469 struct page *page) 470 { 471 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 472 473 if (ld == NULL || ld->search_commit_reqs == NULL) 474 return NULL; 475 return ld->search_commit_reqs(cinfo, page); 476 } 477 478 /* Should the pNFS client commit and return the layout upon a setattr */ 479 static inline bool 480 pnfs_ld_layoutret_on_setattr(struct inode *inode) 481 { 482 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 483 return false; 484 return NFS_SERVER(inode)->pnfs_curr_ld->flags & 485 PNFS_LAYOUTRET_ON_SETATTR; 486 } 487 488 static inline bool 489 pnfs_ld_read_whole_page(struct inode *inode) 490 { 491 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 492 return false; 493 return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE; 494 } 495 496 static inline int 497 pnfs_sync_inode(struct inode *inode, bool datasync) 498 { 499 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 500 return 0; 501 return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync); 502 } 503 504 static inline bool 505 pnfs_layoutcommit_outstanding(struct inode *inode) 506 { 507 struct nfs_inode *nfsi = NFS_I(inode); 508 509 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 || 510 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0; 511 } 512 513 static inline int pnfs_return_layout(struct inode *ino) 514 { 515 struct nfs_inode *nfsi = NFS_I(ino); 516 struct nfs_server *nfss = NFS_SERVER(ino); 517 518 if (pnfs_enabled_sb(nfss) && nfsi->layout) 519 return _pnfs_return_layout(ino); 520 521 return 0; 522 } 523 524 static inline bool 525 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src, 526 struct nfs_server *nfss) 527 { 528 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld && 529 nfss->pnfs_curr_ld->id == src->l_type); 530 } 531 532 static inline u64 533 pnfs_calc_offset_end(u64 offset, u64 len) 534 { 535 if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset) 536 return NFS4_MAX_UINT64; 537 return offset + len - 1; 538 } 539 540 static inline u64 541 pnfs_calc_offset_length(u64 offset, u64 end) 542 { 543 if (end == NFS4_MAX_UINT64 || end <= offset) 544 return NFS4_MAX_UINT64; 545 return 1 + end - offset; 546 } 547 548 /** 549 * pnfs_mark_layout_returned_if_empty - marks the layout as returned 550 * @lo: layout header 551 * 552 * Note: Caller must hold inode->i_lock 553 */ 554 static inline void 555 pnfs_mark_layout_returned_if_empty(struct pnfs_layout_hdr *lo) 556 { 557 if (list_empty(&lo->plh_segs)) 558 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 559 } 560 561 static inline void 562 pnfs_copy_range(struct pnfs_layout_range *dst, 563 const struct pnfs_layout_range *src) 564 { 565 memcpy(dst, src, sizeof(*dst)); 566 } 567 568 extern unsigned int layoutstats_timer; 569 570 #ifdef NFS_DEBUG 571 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id); 572 #else 573 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id) 574 { 575 } 576 577 #endif /* NFS_DEBUG */ 578 #else /* CONFIG_NFS_V4_1 */ 579 580 static inline bool nfs_have_layout(struct inode *inode) 581 { 582 return false; 583 } 584 585 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp) 586 { 587 } 588 589 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi) 590 { 591 } 592 593 static inline struct pnfs_layout_segment * 594 pnfs_get_lseg(struct pnfs_layout_segment *lseg) 595 { 596 return NULL; 597 } 598 599 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg) 600 { 601 } 602 603 static inline int pnfs_return_layout(struct inode *ino) 604 { 605 return 0; 606 } 607 608 static inline int pnfs_commit_and_return_layout(struct inode *inode) 609 { 610 return 0; 611 } 612 613 static inline bool 614 pnfs_ld_layoutret_on_setattr(struct inode *inode) 615 { 616 return false; 617 } 618 619 static inline bool 620 pnfs_ld_read_whole_page(struct inode *inode) 621 { 622 return false; 623 } 624 625 static inline int 626 pnfs_sync_inode(struct inode *inode, bool datasync) 627 { 628 return 0; 629 } 630 631 static inline bool 632 pnfs_roc(struct inode *ino) 633 { 634 return false; 635 } 636 637 static inline void 638 pnfs_roc_release(struct inode *ino) 639 { 640 } 641 642 static inline void 643 pnfs_roc_set_barrier(struct inode *ino, u32 barrier) 644 { 645 } 646 647 static inline void 648 pnfs_roc_get_barrier(struct inode *ino, u32 *barrier) 649 { 650 } 651 652 static inline bool 653 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) 654 { 655 return false; 656 } 657 658 static inline void set_pnfs_layoutdriver(struct nfs_server *s, 659 const struct nfs_fh *mntfh, u32 id) 660 { 661 } 662 663 static inline void unset_pnfs_layoutdriver(struct nfs_server *s) 664 { 665 } 666 667 static inline int 668 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how, 669 struct nfs_commit_info *cinfo) 670 { 671 return PNFS_NOT_ATTEMPTED; 672 } 673 674 static inline struct pnfs_ds_commit_info * 675 pnfs_get_ds_info(struct inode *inode) 676 { 677 return NULL; 678 } 679 680 static inline bool 681 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 682 struct nfs_commit_info *cinfo, u32 ds_commit_idx) 683 { 684 return false; 685 } 686 687 static inline bool 688 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo) 689 { 690 return false; 691 } 692 693 static inline int 694 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo, 695 int max) 696 { 697 return 0; 698 } 699 700 static inline struct nfs_page * 701 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo, 702 struct page *page) 703 { 704 return NULL; 705 } 706 707 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync) 708 { 709 return 0; 710 } 711 712 static inline bool 713 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src, 714 struct nfs_server *nfss) 715 { 716 return false; 717 } 718 719 static inline bool 720 pnfs_layoutcommit_outstanding(struct inode *inode) 721 { 722 return false; 723 } 724 725 726 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 727 { 728 return NULL; 729 } 730 731 static inline void nfs4_pnfs_v3_ds_connect_unload(void) 732 { 733 } 734 735 #endif /* CONFIG_NFS_V4_1 */ 736 737 #if IS_ENABLED(CONFIG_NFS_V4_2) 738 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags); 739 #else 740 static inline int 741 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 742 { 743 return 0; 744 } 745 #endif 746 747 #endif /* FS_NFS_PNFS_H */ 748