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 enum { 39 NFS_LSEG_VALID = 0, /* cleared when lseg is recalled/returned */ 40 NFS_LSEG_ROC, /* roc bit received from server */ 41 NFS_LSEG_LAYOUTCOMMIT, /* layoutcommit bit set for layoutcommit */ 42 NFS_LSEG_LAYOUTRETURN, /* layoutreturn bit set for layoutreturn */ 43 NFS_LSEG_UNAVAILABLE, /* unavailable bit set for temporary problem */ 44 }; 45 46 /* Individual ip address */ 47 struct nfs4_pnfs_ds_addr { 48 struct sockaddr_storage da_addr; 49 size_t da_addrlen; 50 struct list_head da_node; /* nfs4_pnfs_dev_hlist dev_dslist */ 51 char *da_remotestr; /* human readable addr+port */ 52 }; 53 54 struct nfs4_pnfs_ds { 55 struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */ 56 char *ds_remotestr; /* comma sep list of addrs */ 57 struct list_head ds_addrs; 58 struct nfs_client *ds_clp; 59 refcount_t ds_count; 60 unsigned long ds_state; 61 #define NFS4DS_CONNECTING 0 /* ds is establishing connection */ 62 }; 63 64 struct pnfs_layout_segment { 65 struct list_head pls_list; 66 struct list_head pls_lc_list; 67 struct pnfs_layout_range pls_range; 68 refcount_t pls_refcount; 69 u32 pls_seq; 70 unsigned long pls_flags; 71 struct pnfs_layout_hdr *pls_layout; 72 }; 73 74 enum pnfs_try_status { 75 PNFS_ATTEMPTED = 0, 76 PNFS_NOT_ATTEMPTED = 1, 77 PNFS_TRY_AGAIN = 2, 78 }; 79 80 #ifdef CONFIG_NFS_V4_1 81 82 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4" 83 84 /* 85 * Default data server connection timeout and retrans vaules. 86 * Set by module parameters dataserver_timeo and dataserver_retrans. 87 */ 88 #define NFS4_DEF_DS_TIMEO 600 /* in tenths of a second */ 89 #define NFS4_DEF_DS_RETRANS 5 90 #define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ) 91 92 /* error codes for internal use */ 93 #define NFS4ERR_RESET_TO_MDS 12001 94 #define NFS4ERR_RESET_TO_PNFS 12002 95 96 enum { 97 NFS_LAYOUT_RO_FAILED = 0, /* get ro layout failed stop trying */ 98 NFS_LAYOUT_RW_FAILED, /* get rw layout failed stop trying */ 99 NFS_LAYOUT_BULK_RECALL, /* bulk recall affecting layout */ 100 NFS_LAYOUT_RETURN, /* layoutreturn in progress */ 101 NFS_LAYOUT_RETURN_LOCK, /* Serialise layoutreturn */ 102 NFS_LAYOUT_RETURN_REQUESTED, /* Return this layout ASAP */ 103 NFS_LAYOUT_INVALID_STID, /* layout stateid id is invalid */ 104 NFS_LAYOUT_FIRST_LAYOUTGET, /* Serialize first layoutget */ 105 }; 106 107 enum layoutdriver_policy_flags { 108 /* Should the pNFS client commit and return the layout upon truncate to 109 * a smaller size */ 110 PNFS_LAYOUTRET_ON_SETATTR = 1 << 0, 111 PNFS_LAYOUTRET_ON_ERROR = 1 << 1, 112 PNFS_READ_WHOLE_PAGE = 1 << 2, 113 }; 114 115 struct nfs4_deviceid_node; 116 117 /* Per-layout driver specific registration structure */ 118 struct pnfs_layoutdriver_type { 119 struct list_head pnfs_tblid; 120 const u32 id; 121 const char *name; 122 struct module *owner; 123 unsigned flags; 124 unsigned max_deviceinfo_size; 125 126 int (*set_layoutdriver) (struct nfs_server *, const struct nfs_fh *); 127 int (*clear_layoutdriver) (struct nfs_server *); 128 129 struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags); 130 void (*free_layout_hdr) (struct pnfs_layout_hdr *); 131 132 struct pnfs_layout_segment * (*alloc_lseg) (struct pnfs_layout_hdr *layoutid, struct nfs4_layoutget_res *lgr, gfp_t gfp_flags); 133 void (*free_lseg) (struct pnfs_layout_segment *lseg); 134 void (*add_lseg) (struct pnfs_layout_hdr *layoutid, 135 struct pnfs_layout_segment *lseg, 136 struct list_head *free_me); 137 138 void (*return_range) (struct pnfs_layout_hdr *lo, 139 struct pnfs_layout_range *range); 140 141 /* test for nfs page cache coalescing */ 142 const struct nfs_pageio_ops *pg_read_ops; 143 const struct nfs_pageio_ops *pg_write_ops; 144 145 struct pnfs_ds_commit_info *(*get_ds_info) (struct inode *inode); 146 void (*mark_request_commit) (struct nfs_page *req, 147 struct pnfs_layout_segment *lseg, 148 struct nfs_commit_info *cinfo, 149 u32 ds_commit_idx); 150 void (*clear_request_commit) (struct nfs_page *req, 151 struct nfs_commit_info *cinfo); 152 int (*scan_commit_lists) (struct nfs_commit_info *cinfo, 153 int max); 154 void (*recover_commit_reqs) (struct list_head *list, 155 struct nfs_commit_info *cinfo); 156 struct nfs_page * (*search_commit_reqs)(struct nfs_commit_info *cinfo, 157 struct page *page); 158 int (*commit_pagelist)(struct inode *inode, 159 struct list_head *mds_pages, 160 int how, 161 struct nfs_commit_info *cinfo); 162 163 int (*sync)(struct inode *inode, bool datasync); 164 165 /* 166 * Return PNFS_ATTEMPTED to indicate the layout code has attempted 167 * I/O, else return PNFS_NOT_ATTEMPTED to fall back to normal NFS 168 */ 169 enum pnfs_try_status (*read_pagelist)(struct nfs_pgio_header *); 170 enum pnfs_try_status (*write_pagelist)(struct nfs_pgio_header *, int); 171 172 void (*free_deviceid_node) (struct nfs4_deviceid_node *); 173 struct nfs4_deviceid_node * (*alloc_deviceid_node) 174 (struct nfs_server *server, struct pnfs_device *pdev, 175 gfp_t gfp_flags); 176 177 int (*prepare_layoutreturn) (struct nfs4_layoutreturn_args *); 178 179 void (*cleanup_layoutcommit) (struct nfs4_layoutcommit_data *data); 180 int (*prepare_layoutcommit) (struct nfs4_layoutcommit_args *args); 181 int (*prepare_layoutstats) (struct nfs42_layoutstat_args *args); 182 }; 183 184 struct pnfs_layout_hdr { 185 refcount_t plh_refcount; 186 atomic_t plh_outstanding; /* number of RPCs out */ 187 struct list_head plh_layouts; /* other client layouts */ 188 struct list_head plh_bulk_destroy; 189 struct list_head plh_segs; /* layout segments list */ 190 struct list_head plh_return_segs; /* invalid layout segments */ 191 unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */ 192 unsigned long plh_retry_timestamp; 193 unsigned long plh_flags; 194 nfs4_stateid plh_stateid; 195 u32 plh_barrier; /* ignore lower seqids */ 196 u32 plh_return_seq; 197 enum pnfs_iomode plh_return_iomode; 198 loff_t plh_lwb; /* last write byte for layoutcommit */ 199 struct rpc_cred *plh_lc_cred; /* layoutcommit cred */ 200 struct inode *plh_inode; 201 }; 202 203 struct pnfs_device { 204 struct nfs4_deviceid dev_id; 205 unsigned int layout_type; 206 unsigned int mincount; 207 unsigned int maxcount; /* gdia_maxcount */ 208 struct page **pages; 209 unsigned int pgbase; 210 unsigned int pglen; /* reply buffer length */ 211 unsigned char nocache : 1;/* May not be cached */ 212 }; 213 214 #define NFS4_PNFS_GETDEVLIST_MAXNUM 16 215 216 struct pnfs_devicelist { 217 unsigned int eof; 218 unsigned int num_devs; 219 struct nfs4_deviceid dev_id[NFS4_PNFS_GETDEVLIST_MAXNUM]; 220 }; 221 222 extern int pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *); 223 extern void pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *); 224 225 /* nfs4proc.c */ 226 extern int nfs4_proc_getdeviceinfo(struct nfs_server *server, 227 struct pnfs_device *dev, 228 struct rpc_cred *cred); 229 extern struct pnfs_layout_segment* nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags); 230 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync); 231 232 /* pnfs.c */ 233 void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo); 234 void pnfs_put_lseg(struct pnfs_layout_segment *lseg); 235 236 void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, struct nfs_fsinfo *); 237 void unset_pnfs_layoutdriver(struct nfs_server *); 238 void pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio); 239 void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *); 240 int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc); 241 void pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 242 struct nfs_page *req, u64 wb_size); 243 void pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *); 244 int pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc); 245 size_t pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 246 struct nfs_page *prev, struct nfs_page *req); 247 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg); 248 struct pnfs_layout_segment *pnfs_layout_process(struct nfs4_layoutget *lgp); 249 void pnfs_free_lseg_list(struct list_head *tmp_list); 250 void pnfs_destroy_layout(struct nfs_inode *); 251 void pnfs_destroy_all_layouts(struct nfs_client *); 252 int pnfs_destroy_layouts_byfsid(struct nfs_client *clp, 253 struct nfs_fsid *fsid, 254 bool is_recall); 255 int pnfs_destroy_layouts_byclid(struct nfs_client *clp, 256 bool is_recall); 257 bool nfs4_refresh_layout_stateid(nfs4_stateid *dst, struct inode *inode); 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_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 263 struct list_head *tmp_list, 264 const struct pnfs_layout_range *recall_range, 265 u32 seq); 266 int pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 267 struct list_head *tmp_list, 268 const struct pnfs_layout_range *recall_range, 269 u32 seq); 270 int pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, 271 struct list_head *lseg_list); 272 bool pnfs_roc(struct inode *ino, 273 struct nfs4_layoutreturn_args *args, 274 struct nfs4_layoutreturn_res *res, 275 const struct rpc_cred *cred); 276 void pnfs_roc_release(struct nfs4_layoutreturn_args *args, 277 struct nfs4_layoutreturn_res *res, 278 int ret); 279 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task); 280 void pnfs_set_layoutcommit(struct inode *, struct pnfs_layout_segment *, loff_t); 281 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data); 282 int pnfs_layoutcommit_inode(struct inode *inode, bool sync); 283 int pnfs_generic_sync(struct inode *inode, bool datasync); 284 int pnfs_nfs_generic_sync(struct inode *inode, bool datasync); 285 int _pnfs_return_layout(struct inode *); 286 int pnfs_commit_and_return_layout(struct inode *); 287 void pnfs_ld_write_done(struct nfs_pgio_header *); 288 void pnfs_ld_read_done(struct nfs_pgio_header *); 289 void pnfs_read_resend_pnfs(struct nfs_pgio_header *); 290 struct pnfs_layout_segment *pnfs_update_layout(struct inode *ino, 291 struct nfs_open_context *ctx, 292 loff_t pos, 293 u64 count, 294 enum pnfs_iomode iomode, 295 bool strict_iomode, 296 gfp_t gfp_flags); 297 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, 298 const nfs4_stateid *arg_stateid, 299 const struct pnfs_layout_range *range, 300 const nfs4_stateid *stateid); 301 302 void pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 303 struct pnfs_layout_segment *lseg, 304 bool (*is_after)(const struct pnfs_layout_range *lseg_range, 305 const struct pnfs_layout_range *old), 306 bool (*do_merge)(struct pnfs_layout_segment *lseg, 307 struct pnfs_layout_segment *old), 308 struct list_head *free_me); 309 310 void nfs4_deviceid_mark_client_invalid(struct nfs_client *clp); 311 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *); 312 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *); 313 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void); 314 void pnfs_error_mark_layout_for_return(struct inode *inode, 315 struct pnfs_layout_segment *lseg); 316 /* nfs4_deviceid_flags */ 317 enum { 318 NFS_DEVICEID_INVALID = 0, /* set when MDS clientid recalled */ 319 NFS_DEVICEID_UNAVAILABLE, /* device temporarily unavailable */ 320 NFS_DEVICEID_NOCACHE, /* device may not be cached */ 321 }; 322 323 /* pnfs_dev.c */ 324 struct nfs4_deviceid_node { 325 struct hlist_node node; 326 struct hlist_node tmpnode; 327 const struct pnfs_layoutdriver_type *ld; 328 const struct nfs_client *nfs_client; 329 unsigned long flags; 330 unsigned long timestamp_unavailable; 331 struct nfs4_deviceid deviceid; 332 struct rcu_head rcu; 333 atomic_t ref; 334 }; 335 336 struct nfs4_deviceid_node * 337 nfs4_find_get_deviceid(struct nfs_server *server, 338 const struct nfs4_deviceid *id, struct rpc_cred *cred, 339 gfp_t gfp_mask); 340 void nfs4_delete_deviceid(const struct pnfs_layoutdriver_type *, const struct nfs_client *, const struct nfs4_deviceid *); 341 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *, struct nfs_server *, 342 const struct nfs4_deviceid *); 343 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *); 344 void nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node); 345 bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node); 346 void nfs4_deviceid_purge_client(const struct nfs_client *); 347 348 /* pnfs_nfs.c */ 349 void pnfs_generic_clear_request_commit(struct nfs_page *req, 350 struct nfs_commit_info *cinfo); 351 void pnfs_generic_commit_release(void *calldata); 352 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data); 353 void pnfs_generic_rw_release(void *data); 354 void pnfs_generic_recover_commit_reqs(struct list_head *dst, 355 struct nfs_commit_info *cinfo); 356 int pnfs_generic_commit_pagelist(struct inode *inode, 357 struct list_head *mds_pages, 358 int how, 359 struct nfs_commit_info *cinfo, 360 int (*initiate_commit)(struct nfs_commit_data *data, 361 int how)); 362 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max); 363 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data); 364 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds); 365 struct nfs4_pnfs_ds *nfs4_pnfs_ds_add(struct list_head *dsaddrs, 366 gfp_t gfp_flags); 367 void nfs4_pnfs_v3_ds_connect_unload(void); 368 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, 369 struct nfs4_deviceid_node *devid, unsigned int timeo, 370 unsigned int retrans, u32 version, u32 minor_version); 371 struct nfs4_pnfs_ds_addr *nfs4_decode_mp_ds_addr(struct net *net, 372 struct xdr_stream *xdr, 373 gfp_t gfp_flags); 374 void pnfs_layout_mark_request_commit(struct nfs_page *req, 375 struct pnfs_layout_segment *lseg, 376 struct nfs_commit_info *cinfo, 377 u32 ds_commit_idx); 378 379 static inline bool nfs_have_layout(struct inode *inode) 380 { 381 return NFS_I(inode)->layout != NULL; 382 } 383 384 static inline bool pnfs_layout_is_valid(const struct pnfs_layout_hdr *lo) 385 { 386 return test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) == 0; 387 } 388 389 static inline struct nfs4_deviceid_node * 390 nfs4_get_deviceid(struct nfs4_deviceid_node *d) 391 { 392 atomic_inc(&d->ref); 393 return d; 394 } 395 396 static inline struct pnfs_layout_segment * 397 pnfs_get_lseg(struct pnfs_layout_segment *lseg) 398 { 399 if (lseg) { 400 refcount_inc(&lseg->pls_refcount); 401 smp_mb__after_atomic(); 402 } 403 return lseg; 404 } 405 406 static inline bool 407 pnfs_is_valid_lseg(struct pnfs_layout_segment *lseg) 408 { 409 return test_bit(NFS_LSEG_VALID, &lseg->pls_flags) != 0; 410 } 411 412 /* Return true if a layout driver is being used for this mountpoint */ 413 static inline int pnfs_enabled_sb(struct nfs_server *nfss) 414 { 415 return nfss->pnfs_curr_ld != NULL; 416 } 417 418 static inline int 419 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how, 420 struct nfs_commit_info *cinfo) 421 { 422 if (cinfo->ds == NULL || cinfo->ds->ncommitting == 0) 423 return PNFS_NOT_ATTEMPTED; 424 return NFS_SERVER(inode)->pnfs_curr_ld->commit_pagelist(inode, mds_pages, how, cinfo); 425 } 426 427 static inline struct pnfs_ds_commit_info * 428 pnfs_get_ds_info(struct inode *inode) 429 { 430 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 431 432 if (ld == NULL || ld->get_ds_info == NULL) 433 return NULL; 434 return ld->get_ds_info(inode); 435 } 436 437 static inline void 438 pnfs_generic_mark_devid_invalid(struct nfs4_deviceid_node *node) 439 { 440 set_bit(NFS_DEVICEID_INVALID, &node->flags); 441 } 442 443 static inline bool 444 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 445 struct nfs_commit_info *cinfo, u32 ds_commit_idx) 446 { 447 struct inode *inode = d_inode(req->wb_context->dentry); 448 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 449 450 if (lseg == NULL || ld->mark_request_commit == NULL) 451 return false; 452 ld->mark_request_commit(req, lseg, cinfo, ds_commit_idx); 453 return true; 454 } 455 456 static inline bool 457 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo) 458 { 459 struct inode *inode = d_inode(req->wb_context->dentry); 460 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 461 462 if (ld == NULL || ld->clear_request_commit == NULL) 463 return false; 464 ld->clear_request_commit(req, cinfo); 465 return true; 466 } 467 468 static inline int 469 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo, 470 int max) 471 { 472 if (cinfo->ds == NULL || cinfo->ds->nwritten == 0) 473 return 0; 474 else 475 return NFS_SERVER(inode)->pnfs_curr_ld->scan_commit_lists(cinfo, max); 476 } 477 478 static inline struct nfs_page * 479 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo, 480 struct page *page) 481 { 482 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 483 484 if (ld == NULL || ld->search_commit_reqs == NULL) 485 return NULL; 486 return ld->search_commit_reqs(cinfo, page); 487 } 488 489 /* Should the pNFS client commit and return the layout upon a setattr */ 490 static inline bool 491 pnfs_ld_layoutret_on_setattr(struct inode *inode) 492 { 493 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 494 return false; 495 return NFS_SERVER(inode)->pnfs_curr_ld->flags & 496 PNFS_LAYOUTRET_ON_SETATTR; 497 } 498 499 static inline bool 500 pnfs_ld_read_whole_page(struct inode *inode) 501 { 502 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 503 return false; 504 return NFS_SERVER(inode)->pnfs_curr_ld->flags & PNFS_READ_WHOLE_PAGE; 505 } 506 507 static inline int 508 pnfs_sync_inode(struct inode *inode, bool datasync) 509 { 510 if (!pnfs_enabled_sb(NFS_SERVER(inode))) 511 return 0; 512 return NFS_SERVER(inode)->pnfs_curr_ld->sync(inode, datasync); 513 } 514 515 static inline bool 516 pnfs_layoutcommit_outstanding(struct inode *inode) 517 { 518 struct nfs_inode *nfsi = NFS_I(inode); 519 520 return test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags) != 0 || 521 test_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags) != 0; 522 } 523 524 static inline int pnfs_return_layout(struct inode *ino) 525 { 526 struct nfs_inode *nfsi = NFS_I(ino); 527 struct nfs_server *nfss = NFS_SERVER(ino); 528 529 if (pnfs_enabled_sb(nfss) && nfsi->layout) { 530 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &nfsi->layout->plh_flags); 531 return _pnfs_return_layout(ino); 532 } 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 static inline bool 601 pnfs_lseg_request_intersecting(struct pnfs_layout_segment *lseg, struct nfs_page *req) 602 { 603 u64 seg_last = pnfs_end_offset(lseg->pls_range.offset, lseg->pls_range.length); 604 u64 req_last = req_offset(req) + req->wb_bytes; 605 606 return pnfs_is_range_intersecting(lseg->pls_range.offset, seg_last, 607 req_offset(req), req_last); 608 } 609 610 extern unsigned int layoutstats_timer; 611 612 #ifdef NFS_DEBUG 613 void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id); 614 #else 615 static inline void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id) 616 { 617 } 618 619 #endif /* NFS_DEBUG */ 620 #else /* CONFIG_NFS_V4_1 */ 621 622 static inline bool nfs_have_layout(struct inode *inode) 623 { 624 return false; 625 } 626 627 static inline void pnfs_destroy_all_layouts(struct nfs_client *clp) 628 { 629 } 630 631 static inline void pnfs_destroy_layout(struct nfs_inode *nfsi) 632 { 633 } 634 635 static inline struct pnfs_layout_segment * 636 pnfs_get_lseg(struct pnfs_layout_segment *lseg) 637 { 638 return NULL; 639 } 640 641 static inline void pnfs_put_lseg(struct pnfs_layout_segment *lseg) 642 { 643 } 644 645 static inline int pnfs_return_layout(struct inode *ino) 646 { 647 return 0; 648 } 649 650 static inline int pnfs_commit_and_return_layout(struct inode *inode) 651 { 652 return 0; 653 } 654 655 static inline bool 656 pnfs_ld_layoutret_on_setattr(struct inode *inode) 657 { 658 return false; 659 } 660 661 static inline bool 662 pnfs_ld_read_whole_page(struct inode *inode) 663 { 664 return false; 665 } 666 667 static inline int 668 pnfs_sync_inode(struct inode *inode, bool datasync) 669 { 670 return 0; 671 } 672 673 static inline bool 674 pnfs_layoutcommit_outstanding(struct inode *inode) 675 { 676 return false; 677 } 678 679 680 static inline bool 681 pnfs_roc(struct inode *ino, 682 struct nfs4_layoutreturn_args *args, 683 struct nfs4_layoutreturn_res *res, 684 const struct rpc_cred *cred) 685 { 686 return false; 687 } 688 689 static inline void 690 pnfs_roc_release(struct nfs4_layoutreturn_args *args, 691 struct nfs4_layoutreturn_res *res, 692 int ret) 693 { 694 } 695 696 static inline bool 697 pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) 698 { 699 return false; 700 } 701 702 static inline void set_pnfs_layoutdriver(struct nfs_server *s, 703 const struct nfs_fh *mntfh, 704 struct nfs_fsinfo *fsinfo) 705 { 706 } 707 708 static inline void unset_pnfs_layoutdriver(struct nfs_server *s) 709 { 710 } 711 712 static inline int 713 pnfs_commit_list(struct inode *inode, struct list_head *mds_pages, int how, 714 struct nfs_commit_info *cinfo) 715 { 716 return PNFS_NOT_ATTEMPTED; 717 } 718 719 static inline struct pnfs_ds_commit_info * 720 pnfs_get_ds_info(struct inode *inode) 721 { 722 return NULL; 723 } 724 725 static inline bool 726 pnfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, 727 struct nfs_commit_info *cinfo, u32 ds_commit_idx) 728 { 729 return false; 730 } 731 732 static inline bool 733 pnfs_clear_request_commit(struct nfs_page *req, struct nfs_commit_info *cinfo) 734 { 735 return false; 736 } 737 738 static inline int 739 pnfs_scan_commit_lists(struct inode *inode, struct nfs_commit_info *cinfo, 740 int max) 741 { 742 return 0; 743 } 744 745 static inline struct nfs_page * 746 pnfs_search_commit_reqs(struct inode *inode, struct nfs_commit_info *cinfo, 747 struct page *page) 748 { 749 return NULL; 750 } 751 752 static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync) 753 { 754 return 0; 755 } 756 757 static inline bool 758 pnfs_use_threshold(struct nfs4_threshold **dst, struct nfs4_threshold *src, 759 struct nfs_server *nfss) 760 { 761 return false; 762 } 763 764 static inline struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 765 { 766 return NULL; 767 } 768 769 static inline void nfs4_pnfs_v3_ds_connect_unload(void) 770 { 771 } 772 773 static inline bool nfs4_refresh_layout_stateid(nfs4_stateid *dst, 774 struct inode *inode) 775 { 776 return false; 777 } 778 #endif /* CONFIG_NFS_V4_1 */ 779 780 #if IS_ENABLED(CONFIG_NFS_V4_2) 781 int pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags); 782 #else 783 static inline int 784 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 785 { 786 return 0; 787 } 788 #endif 789 790 #endif /* FS_NFS_PNFS_H */ 791