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_LOCK, /* Serialise layoutreturn */ 100 NFS_LAYOUT_RETURN_REQUESTED, /* Return this layout ASAP */ 101 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */ 102 NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */ 103 }; 104 105 enum layoutdriver_policy_flags { 106 /* Should the pNFS client commit and return the layout upon truncate to 107 * a smaller size */ 108 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0, 109 PNFS_LAYOUTRET_ON_ERROR = 1 << 1, 110 PNFS_READ_WHOLE_PAGE = 1 << 2, 111 }; 112 113 struct nfs4_deviceid_node; 114 115 /* Per-layout driver specific registration structure */ 116 struct pnfs_layoutdriver_type { 117 struct list_head pnfs_tblid; 118 const u32 id; 119 const char *name; 120 struct module *owner; 121 unsigned flags; 122 unsigned max_deviceinfo_size; 123 124 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *); 125 int (*clear_layoutdriver) (struct nfs_server *); 126 127 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags); 128 void (*free_layout_hdr) (struct pnfs_layout_hdr *); 129 130 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); 131 void (*free_lseg) (struct pnfs_layout_segment *lseg); 132 void (*add_lseg) (struct pnfs_layout_hdr *layoutid, 133 struct pnfs_layout_segment *lseg, 134 struct list_head *free_me); 135 136 void (*return_range) (struct pnfs_layout_hdr *lo, 137 struct pnfs_layout_range *range); 138 139 /* test for nfs page cache coalescing */ 140 const struct nfs_pageio_ops *pg_read_ops; 141 const struct nfs_pageio_ops *pg_write_ops; 142 143 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode); 144 void (*mark_request_commit) (struct nfs_page *req, 145 struct pnfs_layout_segment *lseg, 146 struct nfs_commit_info *cinfo, 147 u32 ds_commit_idx); 148 void (*clear_request_commit) (struct nfs_page *req, 149 struct nfs_commit_info *cinfo); 150 int (*scan_commit_lists) (struct nfs_commit_info *cinfo, 151 int max); 152 void (*recover_commit_reqs) (struct list_head *list, 153 struct nfs_commit_info *cinfo); 154 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo, 155 struct page *page); 156 int (*commit_pagelist)(struct inode *inode, 157 struct list_head *mds_pages, 158 int how, 159 struct nfs_commit_info *cinfo); 160 161 int (*sync)(struct inode *inode, bool datasync); 162 163 /* 164 * Return PNFS_ATTEMPTED to indicate the layout code has attempted 165 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS 166 */ 167 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *); 168 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int); 169 170 void (*free_deviceid_node) (struct nfs4_deviceid_node *); 171 struct nfs4_deviceid_node * (*alloc_deviceid_node) 172 (struct nfs_server *server, struct pnfs_device *pdev, 173 gfp_t gfp_flags); 174 175 int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *); 176 void (*encode_layoutreturn) (struct xdr_stream *xdr, 177 const struct nfs4_layoutreturn_args *args); 178 179 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data); 180 int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args); 181 void (*encode_layoutcommit) (struct pnfs_layout_hdr *lo, 182 struct xdr_stream *xdr, 183 const struct nfs4_layoutcommit_args *args); 184 int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args); 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 struct list_head plh_return_segs; /* invalid layout segments */ 194 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */ 195 unsigned long plh_retry_timestamp; 196 unsigned long plh_flags; 197 nfs4_stateid plh_stateid; 198 u32 plh_barrier; /* ignore lower seqids */ 199 u32 plh_return_seq; 200 enum pnfs_iomode plh_return_iomode; 201 loff_t plh_lwb; /* last write byte for layoutcommit */ 202 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */ 203 struct inode *plh_inode; 204 }; 205 206 struct pnfs_device { 207 struct nfs4_deviceid dev_id; 208 unsigned int layout_type; 209 unsigned int mincount; 210 unsigned int maxcount; /* gdia_maxcount */ 211 struct page **pages; 212 unsigned int pgbase; 213 unsigned int pglen; /* reply buffer length */ 214 unsigned char nocache : 1;/* May not be cached */ 215 }; 216 217 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16 218 219 struct pnfs_devicelist { 220 unsigned int eof; 221 unsigned int num_devs; 222 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM]; 223 }; 224 225 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *); 226 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *); 227 228 /* nfs4proc.c */ 229 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server, 230 struct pnfs_device *dev, 231 struct rpc_cred *cred); 232 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags); 233 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync); 234 235 /* pnfs.c */ 236 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo); 237 void pnfs_put_lseg(struct pnfs_layout_segment *lseg); 238 void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg); 239 240 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *); 241 void unset_pnfs_layoutdriver(struct nfs_server *); 242 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *); 243 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc); 244 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 245 struct nfs_page *req, u64 wb_size); 246 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *); 247 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc); 248 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 249 struct nfs_page *prev, struct nfs_page *req); 250 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg); 251 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp); 252 void pnfs_free_lseg_list(struct list_head *tmp_list); 253 void pnfs_destroy_layout(struct nfs_inode *); 254 void pnfs_destroy_all_layouts(struct nfs_client *); 255 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp, 256 struct nfs_fsid *fsid, 257 bool is_recall); 258 int pnfs_destroy_layouts_byclid(struct nfs_client *clp, 259 bool is_recall); 260 void pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo); 261 void pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, 262 const nfs4_stateid *new, 263 bool update_barrier); 264 int pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 265 struct list_head *tmp_list, 266 const struct pnfs_layout_range *recall_range, 267 u32 seq); 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 u32 seq); 272 int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, 273 struct list_head *lseg_list); 274 bool pnfs_roc(struct inode *ino, 275 struct nfs4_layoutreturn_args *args, 276 struct nfs4_layoutreturn_res *res, 277 const struct rpc_cred *cred); 278 void pnfs_roc_release(struct nfs4_layoutreturn_args *args, 279 struct nfs4_layoutreturn_res *res, 280 int ret); 281 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task); 282 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t); 283 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data); 284 int pnfs_layoutcommit_inode(struct inode *inode, bool sync); 285 int pnfs_generic_sync(struct inode *inode, bool datasync); 286 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync); 287 int _pnfs_return_layout(struct inode *); 288 int pnfs_commit_and_return_layout(struct inode *); 289 void pnfs_ld_write_done(struct nfs_pgio_header *); 290 void pnfs_ld_read_done(struct nfs_pgio_header *); 291 void pnfs_read_resend_pnfs(struct nfs_pgio_header *); 292 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino, 293 struct nfs_open_context *ctx, 294 loff_t pos, 295 u64 count, 296 enum pnfs_iomode iomode, 297 bool strict_iomode, 298 gfp_t gfp_flags); 299 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, 300 const nfs4_stateid *arg_stateid, 301 const struct pnfs_layout_range *range, 302 const nfs4_stateid *stateid); 303 304 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 305 struct pnfs_layout_segment *lseg, 306 bool (*is_after)(const struct pnfs_layout_range *lseg_range, 307 const struct pnfs_layout_range *old), 308 bool (*do_merge)(struct pnfs_layout_segment *lseg, 309 struct pnfs_layout_segment *old), 310 struct list_head *free_me); 311 312 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp); 313 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *); 314 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *); 315 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void); 316 void pnfs_error_mark_layout_for_return(struct inode *inode, 317 struct pnfs_layout_segment *lseg); 318 /* nfs4_deviceid_flags */ 319 enum { 320 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */ 321 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */ 322 NFS_DEVICEID_NOCACHE, /* device may not be cached */ 323 }; 324 325 /* pnfs_dev.c */ 326 struct nfs4_deviceid_node { 327 struct hlist_node node; 328 struct hlist_node tmpnode; 329 const struct pnfs_layoutdriver_type *ld; 330 const struct nfs_client *nfs_client; 331 unsigned long flags; 332 unsigned long timestamp_unavailable; 333 struct nfs4_deviceid deviceid; 334 struct rcu_head rcu; 335 atomic_t ref; 336 }; 337 338 struct nfs4_deviceid_node * 339 nfs4_find_get_deviceid(struct nfs_server *server, 340 const struct nfs4_deviceid *id, struct rpc_cred *cred, 341 gfp_t gfp_mask); 342 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); 343 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *, 344 const struct nfs4_deviceid *); 345 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *); 346 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node); 347 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node); 348 void nfs4_deviceid_purge_client(const struct nfs_client *); 349 350 /* pnfs_nfs.c */ 351 void pnfs_generic_clear_request_commit(struct nfs_page *req, 352 struct nfs_commit_info *cinfo); 353 void pnfs_generic_commit_release(void *calldata); 354 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data); 355 void pnfs_generic_rw_release(void *data); 356 void pnfs_generic_recover_commit_reqs(struct list_head *dst, 357 struct nfs_commit_info *cinfo); 358 int pnfs_generic_commit_pagelist(struct inode *inode, 359 struct list_head *mds_pages, 360 int how, 361 struct nfs_commit_info *cinfo, 362 int (*initiate_commit)(struct nfs_commit_data *data, 363 int how)); 364 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max); 365 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data); 366 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds); 367 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs, 368 gfp_t gfp_flags); 369 void nfs4_pnfs_v3_ds_connect_unload(void); 370 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 371 struct nfs4_deviceid_node *devid, unsigned int timeo, 372 unsigned int retrans, u32 version, u32 minor_version); 373 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net, 374 struct xdr_stream *xdr, 375 gfp_t gfp_flags); 376 void pnfs_layout_mark_request_commit(struct nfs_page *req, 377 struct pnfs_layout_segment *lseg, 378 struct nfs_commit_info *cinfo, 379 u32 ds_commit_idx); 380 381 static inline bool nfs_have_layout(struct inode *inode) 382 { 383 return NFS_I(inode)->layout != NULL; 384 } 385 386 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo) 387 { 388 return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0; 389 } 390 391 static inline struct nfs4_deviceid_node * 392 nfs4_get_deviceid(struct nfs4_deviceid_node *d) 393 { 394 atomic_inc(&d->ref); 395 return d; 396 } 397 398 static inline struct pnfs_layout_segment * 399 pnfs_get_lseg(struct pnfs_layout_segment *lseg) 400 { 401 if (lseg) { 402 atomic_inc(&lseg->pls_refcount); 403 smp_mb__after_atomic(); 404 } 405 return lseg; 406 } 407 408 static inline bool 409 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg) 410 { 411 return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0; 412 } 413 414 /* Return true if a layout driver is being used for this mountpoint */ 415 static inline int pnfs_enabled_sb(struct nfs_server *nfss) 416 { 417 return nfss->pnfs_curr_ld != NULL; 418 } 419 420 static inline int 421 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how, 422 struct nfs_commit_info *cinfo) 423 { 424 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0) 425 return PNFS_NOT_ATTEMPTED; 426 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo); 427 } 428 429 static inline struct pnfs_ds_commit_info * 430 pnfs_get_ds_info(struct inode *inode) 431 { 432 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 433 434 if (ld == NULL || ld->get_ds_info == NULL) 435 return NULL; 436 return ld->get_ds_info(inode); 437 } 438 439 static inline void 440 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node) 441 { 442 set_bit(NFS_DEVICEID_INVALID, &node->flags); 443 } 444 445 static inline bool 446 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 447 struct nfs_commit_info *cinfo, u32 ds_commit_idx) 448 { 449 struct inode *inode = d_inode(req->wb_context->dentry); 450 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 451 452 if (lseg == NULL || ld->mark_request_commit == NULL) 453 return false; 454 ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx); 455 return true; 456 } 457 458 static inline bool 459 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo) 460 { 461 struct inode *inode = d_inode(req->wb_context->dentry); 462 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 463 464 if (ld == NULL || ld->clear_request_commit == NULL) 465 return false; 466 ld->clear_request_commit(req, cinfo); 467 return true; 468 } 469 470 static inline int 471 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo, 472 int max) 473 { 474 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0) 475 return 0; 476 else 477 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max); 478 } 479 480 static inline struct nfs_page * 481 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo, 482 struct page *page) 483 { 484 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 485 486 if (ld == NULL || ld->search_commit_reqs == NULL) 487 return NULL; 488 return ld->search_commit_reqs(cinfo, page); 489 } 490 491 /* Should the pNFS client commit and return the layout upon a setattr */ 492 static inline bool 493 pnfs_ld_layoutret_on_setattr(struct inode *inode) 494 { 495 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 496 return false; 497 return NFS_SERVER(inode)->pnfs_curr_ld->flags & 498 PNFS_LAYOUTRET_ON_SETATTR; 499 } 500 501 static inline bool 502 pnfs_ld_read_whole_page(struct inode *inode) 503 { 504 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 505 return false; 506 return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE; 507 } 508 509 static inline int 510 pnfs_sync_inode(struct inode *inode, bool datasync) 511 { 512 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 513 return 0; 514 return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync); 515 } 516 517 static inline bool 518 pnfs_layoutcommit_outstanding(struct inode *inode) 519 { 520 struct nfs_inode *nfsi = NFS_I(inode); 521 522 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 || 523 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0; 524 } 525 526 static inline int pnfs_return_layout(struct inode *ino) 527 { 528 struct nfs_inode *nfsi = NFS_I(ino); 529 struct nfs_server *nfss = NFS_SERVER(ino); 530 531 if (pnfs_enabled_sb(nfss) && nfsi->layout) 532 return _pnfs_return_layout(ino); 533 534 return 0; 535 } 536 537 static inline bool 538 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src, 539 struct nfs_server *nfss) 540 { 541 return (dst && src && src->bm != 0 && nfss->pnfs_curr_ld && 542 nfss->pnfs_curr_ld->id == src->l_type); 543 } 544 545 static inline u64 546 pnfs_calc_offset_end(u64 offset, u64 len) 547 { 548 if (len == NFS4_MAX_UINT64 || len >= NFS4_MAX_UINT64 - offset) 549 return NFS4_MAX_UINT64; 550 return offset + len - 1; 551 } 552 553 static inline u64 554 pnfs_calc_offset_length(u64 offset, u64 end) 555 { 556 if (end == NFS4_MAX_UINT64 || end <= offset) 557 return NFS4_MAX_UINT64; 558 return 1 + end - offset; 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 static inline u64 569 pnfs_end_offset(u64 start, u64 len) 570 { 571 if (NFS4_MAX_UINT64 - start <= len) 572 return NFS4_MAX_UINT64; 573 return start + len; 574 } 575 576 /* 577 * Are 2 ranges intersecting? 578 * start1 end1 579 * [----------------------------------) 580 * start2 end2 581 * [----------------) 582 */ 583 static inline bool 584 pnfs_is_range_intersecting(u64 start1, u64 end1, u64 start2, u64 end2) 585 { 586 return (end1 == NFS4_MAX_UINT64 || start2 < end1) && 587 (end2 == NFS4_MAX_UINT64 || start1 < end2); 588 } 589 590 static inline bool 591 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1, 592 const struct pnfs_layout_range *l2) 593 { 594 u64 end1 = pnfs_end_offset(l1->offset, l1->length); 595 u64 end2 = pnfs_end_offset(l2->offset, l2->length); 596 597 return pnfs_is_range_intersecting(l1->offset, end1, l2->offset, end2); 598 } 599 600 extern unsigned int layoutstats_timer; 601 602 #ifdef NFS_DEBUG 603 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id); 604 #else 605 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id) 606 { 607 } 608 609 #endif /* NFS_DEBUG */ 610 #else /* CONFIG_NFS_V4_1 */ 611 612 static inline bool nfs_have_layout(struct inode *inode) 613 { 614 return false; 615 } 616 617 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp) 618 { 619 } 620 621 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi) 622 { 623 } 624 625 static inline struct pnfs_layout_segment * 626 pnfs_get_lseg(struct pnfs_layout_segment *lseg) 627 { 628 return NULL; 629 } 630 631 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg) 632 { 633 } 634 635 static inline int pnfs_return_layout(struct inode *ino) 636 { 637 return 0; 638 } 639 640 static inline int pnfs_commit_and_return_layout(struct inode *inode) 641 { 642 return 0; 643 } 644 645 static inline bool 646 pnfs_ld_layoutret_on_setattr(struct inode *inode) 647 { 648 return false; 649 } 650 651 static inline bool 652 pnfs_ld_read_whole_page(struct inode *inode) 653 { 654 return false; 655 } 656 657 static inline int 658 pnfs_sync_inode(struct inode *inode, bool datasync) 659 { 660 return 0; 661 } 662 663 static inline bool 664 pnfs_layoutcommit_outstanding(struct inode *inode) 665 { 666 return false; 667 } 668 669 670 static inline bool 671 pnfs_roc(struct inode *ino, 672 struct nfs4_layoutreturn_args *args, 673 struct nfs4_layoutreturn_res *res, 674 const struct rpc_cred *cred) 675 { 676 return false; 677 } 678 679 static inline void 680 pnfs_roc_release(struct nfs4_layoutreturn_args *args, 681 struct nfs4_layoutreturn_res *res, 682 int ret) 683 { 684 } 685 686 static inline bool 687 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) 688 { 689 return false; 690 } 691 692 static inline void set_pnfs_layoutdriver(struct nfs_server *s, 693 const struct nfs_fh *mntfh, 694 struct nfs_fsinfo *fsinfo) 695 { 696 } 697 698 static inline void unset_pnfs_layoutdriver(struct nfs_server *s) 699 { 700 } 701 702 static inline int 703 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how, 704 struct nfs_commit_info *cinfo) 705 { 706 return PNFS_NOT_ATTEMPTED; 707 } 708 709 static inline struct pnfs_ds_commit_info * 710 pnfs_get_ds_info(struct inode *inode) 711 { 712 return NULL; 713 } 714 715 static inline bool 716 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 717 struct nfs_commit_info *cinfo, u32 ds_commit_idx) 718 { 719 return false; 720 } 721 722 static inline bool 723 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo) 724 { 725 return false; 726 } 727 728 static inline int 729 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo, 730 int max) 731 { 732 return 0; 733 } 734 735 static inline struct nfs_page * 736 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo, 737 struct page *page) 738 { 739 return NULL; 740 } 741 742 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync) 743 { 744 return 0; 745 } 746 747 static inline bool 748 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src, 749 struct nfs_server *nfss) 750 { 751 return false; 752 } 753 754 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 755 { 756 return NULL; 757 } 758 759 static inline void nfs4_pnfs_v3_ds_connect_unload(void) 760 { 761 } 762 763 #endif /* CONFIG_NFS_V4_1 */ 764 765 #if IS_ENABLED(CONFIG_NFS_V4_2) 766 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags); 767 #else 768 static inline int 769 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 770 { 771 return 0; 772 } 773 #endif 774 775 #endif /* FS_NFS_PNFS_H */ 776