1 /* 2 * pNFS functions to call and manage layout drivers. 3 * 4 * Copyright (c) 2002 [year of first publication] 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 #include <linux/nfs_fs.h> 31 #include <linux/nfs_page.h> 32 #include <linux/module.h> 33 #include "internal.h" 34 #include "pnfs.h" 35 #include "iostat.h" 36 37 #define NFSDBG_FACILITY NFSDBG_PNFS 38 39 /* Locking: 40 * 41 * pnfs_spinlock: 42 * protects pnfs_modules_tbl. 43 */ 44 static DEFINE_SPINLOCK(pnfs_spinlock); 45 46 /* 47 * pnfs_modules_tbl holds all pnfs modules 48 */ 49 static LIST_HEAD(pnfs_modules_tbl); 50 51 /* Return the registered pnfs layout driver module matching given id */ 52 static struct pnfs_layoutdriver_type * 53 find_pnfs_driver_locked(u32 id) 54 { 55 struct pnfs_layoutdriver_type *local; 56 57 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid) 58 if (local->id == id) 59 goto out; 60 local = NULL; 61 out: 62 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); 63 return local; 64 } 65 66 static struct pnfs_layoutdriver_type * 67 find_pnfs_driver(u32 id) 68 { 69 struct pnfs_layoutdriver_type *local; 70 71 spin_lock(&pnfs_spinlock); 72 local = find_pnfs_driver_locked(id); 73 spin_unlock(&pnfs_spinlock); 74 return local; 75 } 76 77 void 78 unset_pnfs_layoutdriver(struct nfs_server *nfss) 79 { 80 if (nfss->pnfs_curr_ld) { 81 if (nfss->pnfs_curr_ld->clear_layoutdriver) 82 nfss->pnfs_curr_ld->clear_layoutdriver(nfss); 83 module_put(nfss->pnfs_curr_ld->owner); 84 } 85 nfss->pnfs_curr_ld = NULL; 86 } 87 88 /* 89 * Try to set the server's pnfs module to the pnfs layout type specified by id. 90 * Currently only one pNFS layout driver per filesystem is supported. 91 * 92 * @id layout type. Zero (illegal layout type) indicates pNFS not in use. 93 */ 94 void 95 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, 96 u32 id) 97 { 98 struct pnfs_layoutdriver_type *ld_type = NULL; 99 100 if (id == 0) 101 goto out_no_driver; 102 if (!(server->nfs_client->cl_exchange_flags & 103 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { 104 printk(KERN_ERR "%s: id %u cl_exchange_flags 0x%x\n", __func__, 105 id, server->nfs_client->cl_exchange_flags); 106 goto out_no_driver; 107 } 108 ld_type = find_pnfs_driver(id); 109 if (!ld_type) { 110 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); 111 ld_type = find_pnfs_driver(id); 112 if (!ld_type) { 113 dprintk("%s: No pNFS module found for %u.\n", 114 __func__, id); 115 goto out_no_driver; 116 } 117 } 118 if (!try_module_get(ld_type->owner)) { 119 dprintk("%s: Could not grab reference on module\n", __func__); 120 goto out_no_driver; 121 } 122 server->pnfs_curr_ld = ld_type; 123 if (ld_type->set_layoutdriver 124 && ld_type->set_layoutdriver(server, mntfh)) { 125 printk(KERN_ERR "%s: Error initializing pNFS layout driver %u.\n", 126 __func__, id); 127 module_put(ld_type->owner); 128 goto out_no_driver; 129 } 130 131 dprintk("%s: pNFS module for %u set\n", __func__, id); 132 return; 133 134 out_no_driver: 135 dprintk("%s: Using NFSv4 I/O\n", __func__); 136 server->pnfs_curr_ld = NULL; 137 } 138 139 int 140 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 141 { 142 int status = -EINVAL; 143 struct pnfs_layoutdriver_type *tmp; 144 145 if (ld_type->id == 0) { 146 printk(KERN_ERR "%s id 0 is reserved\n", __func__); 147 return status; 148 } 149 if (!ld_type->alloc_lseg || !ld_type->free_lseg) { 150 printk(KERN_ERR "%s Layout driver must provide " 151 "alloc_lseg and free_lseg.\n", __func__); 152 return status; 153 } 154 155 spin_lock(&pnfs_spinlock); 156 tmp = find_pnfs_driver_locked(ld_type->id); 157 if (!tmp) { 158 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); 159 status = 0; 160 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, 161 ld_type->name); 162 } else { 163 printk(KERN_ERR "%s Module with id %d already loaded!\n", 164 __func__, ld_type->id); 165 } 166 spin_unlock(&pnfs_spinlock); 167 168 return status; 169 } 170 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); 171 172 void 173 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 174 { 175 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); 176 spin_lock(&pnfs_spinlock); 177 list_del(&ld_type->pnfs_tblid); 178 spin_unlock(&pnfs_spinlock); 179 } 180 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); 181 182 /* 183 * pNFS client layout cache 184 */ 185 186 /* Need to hold i_lock if caller does not already hold reference */ 187 void 188 get_layout_hdr(struct pnfs_layout_hdr *lo) 189 { 190 atomic_inc(&lo->plh_refcount); 191 } 192 193 static struct pnfs_layout_hdr * 194 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) 195 { 196 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 197 return ld->alloc_layout_hdr ? ld->alloc_layout_hdr(ino, gfp_flags) : 198 kzalloc(sizeof(struct pnfs_layout_hdr), gfp_flags); 199 } 200 201 static void 202 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) 203 { 204 struct pnfs_layoutdriver_type *ld = NFS_SERVER(lo->plh_inode)->pnfs_curr_ld; 205 put_rpccred(lo->plh_lc_cred); 206 return ld->alloc_layout_hdr ? ld->free_layout_hdr(lo) : kfree(lo); 207 } 208 209 static void 210 destroy_layout_hdr(struct pnfs_layout_hdr *lo) 211 { 212 dprintk("%s: freeing layout cache %p\n", __func__, lo); 213 BUG_ON(!list_empty(&lo->plh_layouts)); 214 NFS_I(lo->plh_inode)->layout = NULL; 215 pnfs_free_layout_hdr(lo); 216 } 217 218 static void 219 put_layout_hdr_locked(struct pnfs_layout_hdr *lo) 220 { 221 if (atomic_dec_and_test(&lo->plh_refcount)) 222 destroy_layout_hdr(lo); 223 } 224 225 void 226 put_layout_hdr(struct pnfs_layout_hdr *lo) 227 { 228 struct inode *inode = lo->plh_inode; 229 230 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { 231 destroy_layout_hdr(lo); 232 spin_unlock(&inode->i_lock); 233 } 234 } 235 236 static void 237 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg) 238 { 239 INIT_LIST_HEAD(&lseg->pls_list); 240 INIT_LIST_HEAD(&lseg->pls_lc_list); 241 atomic_set(&lseg->pls_refcount, 1); 242 smp_mb(); 243 set_bit(NFS_LSEG_VALID, &lseg->pls_flags); 244 lseg->pls_layout = lo; 245 } 246 247 static void free_lseg(struct pnfs_layout_segment *lseg) 248 { 249 struct inode *ino = lseg->pls_layout->plh_inode; 250 251 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 252 /* Matched by get_layout_hdr in pnfs_insert_layout */ 253 put_layout_hdr(NFS_I(ino)->layout); 254 } 255 256 static void 257 put_lseg_common(struct pnfs_layout_segment *lseg) 258 { 259 struct inode *inode = lseg->pls_layout->plh_inode; 260 261 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 262 list_del_init(&lseg->pls_list); 263 if (list_empty(&lseg->pls_layout->plh_segs)) { 264 set_bit(NFS_LAYOUT_DESTROYED, &lseg->pls_layout->plh_flags); 265 /* Matched by initial refcount set in alloc_init_layout_hdr */ 266 put_layout_hdr_locked(lseg->pls_layout); 267 } 268 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq); 269 } 270 271 void 272 put_lseg(struct pnfs_layout_segment *lseg) 273 { 274 struct inode *inode; 275 276 if (!lseg) 277 return; 278 279 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, 280 atomic_read(&lseg->pls_refcount), 281 test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 282 inode = lseg->pls_layout->plh_inode; 283 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { 284 LIST_HEAD(free_me); 285 286 put_lseg_common(lseg); 287 list_add(&lseg->pls_list, &free_me); 288 spin_unlock(&inode->i_lock); 289 pnfs_free_lseg_list(&free_me); 290 } 291 } 292 EXPORT_SYMBOL_GPL(put_lseg); 293 294 static inline u64 295 end_offset(u64 start, u64 len) 296 { 297 u64 end; 298 299 end = start + len; 300 return end >= start ? end : NFS4_MAX_UINT64; 301 } 302 303 /* last octet in a range */ 304 static inline u64 305 last_byte_offset(u64 start, u64 len) 306 { 307 u64 end; 308 309 BUG_ON(!len); 310 end = start + len; 311 return end > start ? end - 1 : NFS4_MAX_UINT64; 312 } 313 314 /* 315 * is l2 fully contained in l1? 316 * start1 end1 317 * [----------------------------------) 318 * start2 end2 319 * [----------------) 320 */ 321 static inline int 322 lo_seg_contained(struct pnfs_layout_range *l1, 323 struct pnfs_layout_range *l2) 324 { 325 u64 start1 = l1->offset; 326 u64 end1 = end_offset(start1, l1->length); 327 u64 start2 = l2->offset; 328 u64 end2 = end_offset(start2, l2->length); 329 330 return (start1 <= start2) && (end1 >= end2); 331 } 332 333 /* 334 * is l1 and l2 intersecting? 335 * start1 end1 336 * [----------------------------------) 337 * start2 end2 338 * [----------------) 339 */ 340 static inline int 341 lo_seg_intersecting(struct pnfs_layout_range *l1, 342 struct pnfs_layout_range *l2) 343 { 344 u64 start1 = l1->offset; 345 u64 end1 = end_offset(start1, l1->length); 346 u64 start2 = l2->offset; 347 u64 end2 = end_offset(start2, l2->length); 348 349 return (end1 == NFS4_MAX_UINT64 || end1 > start2) && 350 (end2 == NFS4_MAX_UINT64 || end2 > start1); 351 } 352 353 static bool 354 should_free_lseg(struct pnfs_layout_range *lseg_range, 355 struct pnfs_layout_range *recall_range) 356 { 357 return (recall_range->iomode == IOMODE_ANY || 358 lseg_range->iomode == recall_range->iomode) && 359 lo_seg_intersecting(lseg_range, recall_range); 360 } 361 362 /* Returns 1 if lseg is removed from list, 0 otherwise */ 363 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, 364 struct list_head *tmp_list) 365 { 366 int rv = 0; 367 368 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 369 /* Remove the reference keeping the lseg in the 370 * list. It will now be removed when all 371 * outstanding io is finished. 372 */ 373 dprintk("%s: lseg %p ref %d\n", __func__, lseg, 374 atomic_read(&lseg->pls_refcount)); 375 if (atomic_dec_and_test(&lseg->pls_refcount)) { 376 put_lseg_common(lseg); 377 list_add(&lseg->pls_list, tmp_list); 378 rv = 1; 379 } 380 } 381 return rv; 382 } 383 384 /* Returns count of number of matching invalid lsegs remaining in list 385 * after call. 386 */ 387 int 388 mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 389 struct list_head *tmp_list, 390 struct pnfs_layout_range *recall_range) 391 { 392 struct pnfs_layout_segment *lseg, *next; 393 int invalid = 0, removed = 0; 394 395 dprintk("%s:Begin lo %p\n", __func__, lo); 396 397 if (list_empty(&lo->plh_segs)) { 398 if (!test_and_set_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) 399 put_layout_hdr_locked(lo); 400 return 0; 401 } 402 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 403 if (!recall_range || 404 should_free_lseg(&lseg->pls_range, recall_range)) { 405 dprintk("%s: freeing lseg %p iomode %d " 406 "offset %llu length %llu\n", __func__, 407 lseg, lseg->pls_range.iomode, lseg->pls_range.offset, 408 lseg->pls_range.length); 409 invalid++; 410 removed += mark_lseg_invalid(lseg, tmp_list); 411 } 412 dprintk("%s:Return %i\n", __func__, invalid - removed); 413 return invalid - removed; 414 } 415 416 /* note free_me must contain lsegs from a single layout_hdr */ 417 void 418 pnfs_free_lseg_list(struct list_head *free_me) 419 { 420 struct pnfs_layout_segment *lseg, *tmp; 421 struct pnfs_layout_hdr *lo; 422 423 if (list_empty(free_me)) 424 return; 425 426 lo = list_first_entry(free_me, struct pnfs_layout_segment, 427 pls_list)->pls_layout; 428 429 if (test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags)) { 430 struct nfs_client *clp; 431 432 clp = NFS_SERVER(lo->plh_inode)->nfs_client; 433 spin_lock(&clp->cl_lock); 434 list_del_init(&lo->plh_layouts); 435 spin_unlock(&clp->cl_lock); 436 } 437 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { 438 list_del(&lseg->pls_list); 439 free_lseg(lseg); 440 } 441 } 442 443 void 444 pnfs_destroy_layout(struct nfs_inode *nfsi) 445 { 446 struct pnfs_layout_hdr *lo; 447 LIST_HEAD(tmp_list); 448 449 spin_lock(&nfsi->vfs_inode.i_lock); 450 lo = nfsi->layout; 451 if (lo) { 452 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */ 453 mark_matching_lsegs_invalid(lo, &tmp_list, NULL); 454 } 455 spin_unlock(&nfsi->vfs_inode.i_lock); 456 pnfs_free_lseg_list(&tmp_list); 457 } 458 459 /* 460 * Called by the state manger to remove all layouts established under an 461 * expired lease. 462 */ 463 void 464 pnfs_destroy_all_layouts(struct nfs_client *clp) 465 { 466 struct nfs_server *server; 467 struct pnfs_layout_hdr *lo; 468 LIST_HEAD(tmp_list); 469 470 nfs4_deviceid_mark_client_invalid(clp); 471 nfs4_deviceid_purge_client(clp); 472 473 spin_lock(&clp->cl_lock); 474 rcu_read_lock(); 475 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 476 if (!list_empty(&server->layouts)) 477 list_splice_init(&server->layouts, &tmp_list); 478 } 479 rcu_read_unlock(); 480 spin_unlock(&clp->cl_lock); 481 482 while (!list_empty(&tmp_list)) { 483 lo = list_entry(tmp_list.next, struct pnfs_layout_hdr, 484 plh_layouts); 485 dprintk("%s freeing layout for inode %lu\n", __func__, 486 lo->plh_inode->i_ino); 487 list_del_init(&lo->plh_layouts); 488 pnfs_destroy_layout(NFS_I(lo->plh_inode)); 489 } 490 } 491 492 /* update lo->plh_stateid with new if is more recent */ 493 void 494 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, 495 bool update_barrier) 496 { 497 u32 oldseq, newseq; 498 499 oldseq = be32_to_cpu(lo->plh_stateid.stateid.seqid); 500 newseq = be32_to_cpu(new->stateid.seqid); 501 if ((int)(newseq - oldseq) > 0) { 502 memcpy(&lo->plh_stateid, &new->stateid, sizeof(new->stateid)); 503 if (update_barrier) { 504 u32 new_barrier = be32_to_cpu(new->stateid.seqid); 505 506 if ((int)(new_barrier - lo->plh_barrier)) 507 lo->plh_barrier = new_barrier; 508 } else { 509 /* Because of wraparound, we want to keep the barrier 510 * "close" to the current seqids. It needs to be 511 * within 2**31 to count as "behind", so if it 512 * gets too near that limit, give us a litle leeway 513 * and bring it to within 2**30. 514 * NOTE - and yes, this is all unsigned arithmetic. 515 */ 516 if (unlikely((newseq - lo->plh_barrier) > (3 << 29))) 517 lo->plh_barrier = newseq - (1 << 30); 518 } 519 } 520 } 521 522 /* lget is set to 1 if called from inside send_layoutget call chain */ 523 static bool 524 pnfs_layoutgets_blocked(struct pnfs_layout_hdr *lo, nfs4_stateid *stateid, 525 int lget) 526 { 527 if ((stateid) && 528 (int)(lo->plh_barrier - be32_to_cpu(stateid->stateid.seqid)) >= 0) 529 return true; 530 return lo->plh_block_lgets || 531 test_bit(NFS_LAYOUT_DESTROYED, &lo->plh_flags) || 532 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || 533 (list_empty(&lo->plh_segs) && 534 (atomic_read(&lo->plh_outstanding) > lget)); 535 } 536 537 int 538 pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, 539 struct nfs4_state *open_state) 540 { 541 int status = 0; 542 543 dprintk("--> %s\n", __func__); 544 spin_lock(&lo->plh_inode->i_lock); 545 if (pnfs_layoutgets_blocked(lo, NULL, 1)) { 546 status = -EAGAIN; 547 } else if (list_empty(&lo->plh_segs)) { 548 int seq; 549 550 do { 551 seq = read_seqbegin(&open_state->seqlock); 552 memcpy(dst->data, open_state->stateid.data, 553 sizeof(open_state->stateid.data)); 554 } while (read_seqretry(&open_state->seqlock, seq)); 555 } else 556 memcpy(dst->data, lo->plh_stateid.data, sizeof(lo->plh_stateid.data)); 557 spin_unlock(&lo->plh_inode->i_lock); 558 dprintk("<-- %s\n", __func__); 559 return status; 560 } 561 562 /* 563 * Get layout from server. 564 * for now, assume that whole file layouts are requested. 565 * arg->offset: 0 566 * arg->length: all ones 567 */ 568 static struct pnfs_layout_segment * 569 send_layoutget(struct pnfs_layout_hdr *lo, 570 struct nfs_open_context *ctx, 571 struct pnfs_layout_range *range, 572 gfp_t gfp_flags) 573 { 574 struct inode *ino = lo->plh_inode; 575 struct nfs_server *server = NFS_SERVER(ino); 576 struct nfs4_layoutget *lgp; 577 struct pnfs_layout_segment *lseg = NULL; 578 struct page **pages = NULL; 579 int i; 580 u32 max_resp_sz, max_pages; 581 582 dprintk("--> %s\n", __func__); 583 584 BUG_ON(ctx == NULL); 585 lgp = kzalloc(sizeof(*lgp), gfp_flags); 586 if (lgp == NULL) 587 return NULL; 588 589 /* allocate pages for xdr post processing */ 590 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz; 591 max_pages = max_resp_sz >> PAGE_SHIFT; 592 593 pages = kzalloc(max_pages * sizeof(struct page *), gfp_flags); 594 if (!pages) 595 goto out_err_free; 596 597 for (i = 0; i < max_pages; i++) { 598 pages[i] = alloc_page(gfp_flags); 599 if (!pages[i]) 600 goto out_err_free; 601 } 602 603 lgp->args.minlength = PAGE_CACHE_SIZE; 604 if (lgp->args.minlength > range->length) 605 lgp->args.minlength = range->length; 606 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; 607 lgp->args.range = *range; 608 lgp->args.type = server->pnfs_curr_ld->id; 609 lgp->args.inode = ino; 610 lgp->args.ctx = get_nfs_open_context(ctx); 611 lgp->args.layout.pages = pages; 612 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 613 lgp->lsegpp = &lseg; 614 lgp->gfp_flags = gfp_flags; 615 616 /* Synchronously retrieve layout information from server and 617 * store in lseg. 618 */ 619 nfs4_proc_layoutget(lgp); 620 if (!lseg) { 621 /* remember that LAYOUTGET failed and suspend trying */ 622 set_bit(lo_fail_bit(range->iomode), &lo->plh_flags); 623 } 624 625 /* free xdr pages */ 626 for (i = 0; i < max_pages; i++) 627 __free_page(pages[i]); 628 kfree(pages); 629 630 return lseg; 631 632 out_err_free: 633 /* free any allocated xdr pages, lgp as it's not used */ 634 if (pages) { 635 for (i = 0; i < max_pages; i++) { 636 if (!pages[i]) 637 break; 638 __free_page(pages[i]); 639 } 640 kfree(pages); 641 } 642 kfree(lgp); 643 return NULL; 644 } 645 646 /* Initiates a LAYOUTRETURN(FILE) */ 647 int 648 _pnfs_return_layout(struct inode *ino) 649 { 650 struct pnfs_layout_hdr *lo = NULL; 651 struct nfs_inode *nfsi = NFS_I(ino); 652 LIST_HEAD(tmp_list); 653 struct nfs4_layoutreturn *lrp; 654 nfs4_stateid stateid; 655 int status = 0; 656 657 dprintk("--> %s\n", __func__); 658 659 spin_lock(&ino->i_lock); 660 lo = nfsi->layout; 661 if (!lo) { 662 spin_unlock(&ino->i_lock); 663 dprintk("%s: no layout to return\n", __func__); 664 return status; 665 } 666 stateid = nfsi->layout->plh_stateid; 667 /* Reference matched in nfs4_layoutreturn_release */ 668 get_layout_hdr(lo); 669 mark_matching_lsegs_invalid(lo, &tmp_list, NULL); 670 lo->plh_block_lgets++; 671 spin_unlock(&ino->i_lock); 672 pnfs_free_lseg_list(&tmp_list); 673 674 WARN_ON(test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)); 675 676 lrp = kzalloc(sizeof(*lrp), GFP_KERNEL); 677 if (unlikely(lrp == NULL)) { 678 status = -ENOMEM; 679 set_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags); 680 set_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags); 681 put_layout_hdr(lo); 682 goto out; 683 } 684 685 lrp->args.stateid = stateid; 686 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id; 687 lrp->args.inode = ino; 688 lrp->args.layout = lo; 689 lrp->clp = NFS_SERVER(ino)->nfs_client; 690 691 status = nfs4_proc_layoutreturn(lrp); 692 out: 693 dprintk("<-- %s status: %d\n", __func__, status); 694 return status; 695 } 696 697 bool pnfs_roc(struct inode *ino) 698 { 699 struct pnfs_layout_hdr *lo; 700 struct pnfs_layout_segment *lseg, *tmp; 701 LIST_HEAD(tmp_list); 702 bool found = false; 703 704 spin_lock(&ino->i_lock); 705 lo = NFS_I(ino)->layout; 706 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) || 707 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) 708 goto out_nolayout; 709 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list) 710 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { 711 mark_lseg_invalid(lseg, &tmp_list); 712 found = true; 713 } 714 if (!found) 715 goto out_nolayout; 716 lo->plh_block_lgets++; 717 get_layout_hdr(lo); /* matched in pnfs_roc_release */ 718 spin_unlock(&ino->i_lock); 719 pnfs_free_lseg_list(&tmp_list); 720 return true; 721 722 out_nolayout: 723 spin_unlock(&ino->i_lock); 724 return false; 725 } 726 727 void pnfs_roc_release(struct inode *ino) 728 { 729 struct pnfs_layout_hdr *lo; 730 731 spin_lock(&ino->i_lock); 732 lo = NFS_I(ino)->layout; 733 lo->plh_block_lgets--; 734 put_layout_hdr_locked(lo); 735 spin_unlock(&ino->i_lock); 736 } 737 738 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier) 739 { 740 struct pnfs_layout_hdr *lo; 741 742 spin_lock(&ino->i_lock); 743 lo = NFS_I(ino)->layout; 744 if ((int)(barrier - lo->plh_barrier) > 0) 745 lo->plh_barrier = barrier; 746 spin_unlock(&ino->i_lock); 747 } 748 749 bool pnfs_roc_drain(struct inode *ino, u32 *barrier) 750 { 751 struct nfs_inode *nfsi = NFS_I(ino); 752 struct pnfs_layout_segment *lseg; 753 bool found = false; 754 755 spin_lock(&ino->i_lock); 756 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list) 757 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { 758 found = true; 759 break; 760 } 761 if (!found) { 762 struct pnfs_layout_hdr *lo = nfsi->layout; 763 u32 current_seqid = be32_to_cpu(lo->plh_stateid.stateid.seqid); 764 765 /* Since close does not return a layout stateid for use as 766 * a barrier, we choose the worst-case barrier. 767 */ 768 *barrier = current_seqid + atomic_read(&lo->plh_outstanding); 769 } 770 spin_unlock(&ino->i_lock); 771 return found; 772 } 773 774 /* 775 * Compare two layout segments for sorting into layout cache. 776 * We want to preferentially return RW over RO layouts, so ensure those 777 * are seen first. 778 */ 779 static s64 780 cmp_layout(struct pnfs_layout_range *l1, 781 struct pnfs_layout_range *l2) 782 { 783 s64 d; 784 785 /* high offset > low offset */ 786 d = l1->offset - l2->offset; 787 if (d) 788 return d; 789 790 /* short length > long length */ 791 d = l2->length - l1->length; 792 if (d) 793 return d; 794 795 /* read > read/write */ 796 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); 797 } 798 799 static void 800 pnfs_insert_layout(struct pnfs_layout_hdr *lo, 801 struct pnfs_layout_segment *lseg) 802 { 803 struct pnfs_layout_segment *lp; 804 805 dprintk("%s:Begin\n", __func__); 806 807 assert_spin_locked(&lo->plh_inode->i_lock); 808 list_for_each_entry(lp, &lo->plh_segs, pls_list) { 809 if (cmp_layout(&lseg->pls_range, &lp->pls_range) > 0) 810 continue; 811 list_add_tail(&lseg->pls_list, &lp->pls_list); 812 dprintk("%s: inserted lseg %p " 813 "iomode %d offset %llu length %llu before " 814 "lp %p iomode %d offset %llu length %llu\n", 815 __func__, lseg, lseg->pls_range.iomode, 816 lseg->pls_range.offset, lseg->pls_range.length, 817 lp, lp->pls_range.iomode, lp->pls_range.offset, 818 lp->pls_range.length); 819 goto out; 820 } 821 list_add_tail(&lseg->pls_list, &lo->plh_segs); 822 dprintk("%s: inserted lseg %p " 823 "iomode %d offset %llu length %llu at tail\n", 824 __func__, lseg, lseg->pls_range.iomode, 825 lseg->pls_range.offset, lseg->pls_range.length); 826 out: 827 get_layout_hdr(lo); 828 829 dprintk("%s:Return\n", __func__); 830 } 831 832 static struct pnfs_layout_hdr * 833 alloc_init_layout_hdr(struct inode *ino, 834 struct nfs_open_context *ctx, 835 gfp_t gfp_flags) 836 { 837 struct pnfs_layout_hdr *lo; 838 839 lo = pnfs_alloc_layout_hdr(ino, gfp_flags); 840 if (!lo) 841 return NULL; 842 atomic_set(&lo->plh_refcount, 1); 843 INIT_LIST_HEAD(&lo->plh_layouts); 844 INIT_LIST_HEAD(&lo->plh_segs); 845 INIT_LIST_HEAD(&lo->plh_bulk_recall); 846 lo->plh_inode = ino; 847 lo->plh_lc_cred = get_rpccred(ctx->state->owner->so_cred); 848 return lo; 849 } 850 851 static struct pnfs_layout_hdr * 852 pnfs_find_alloc_layout(struct inode *ino, 853 struct nfs_open_context *ctx, 854 gfp_t gfp_flags) 855 { 856 struct nfs_inode *nfsi = NFS_I(ino); 857 struct pnfs_layout_hdr *new = NULL; 858 859 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); 860 861 assert_spin_locked(&ino->i_lock); 862 if (nfsi->layout) { 863 if (test_bit(NFS_LAYOUT_DESTROYED, &nfsi->layout->plh_flags)) 864 return NULL; 865 else 866 return nfsi->layout; 867 } 868 spin_unlock(&ino->i_lock); 869 new = alloc_init_layout_hdr(ino, ctx, gfp_flags); 870 spin_lock(&ino->i_lock); 871 872 if (likely(nfsi->layout == NULL)) /* Won the race? */ 873 nfsi->layout = new; 874 else 875 pnfs_free_layout_hdr(new); 876 return nfsi->layout; 877 } 878 879 /* 880 * iomode matching rules: 881 * iomode lseg match 882 * ----- ----- ----- 883 * ANY READ true 884 * ANY RW true 885 * RW READ false 886 * RW RW true 887 * READ READ true 888 * READ RW true 889 */ 890 static int 891 is_matching_lseg(struct pnfs_layout_range *ls_range, 892 struct pnfs_layout_range *range) 893 { 894 struct pnfs_layout_range range1; 895 896 if ((range->iomode == IOMODE_RW && 897 ls_range->iomode != IOMODE_RW) || 898 !lo_seg_intersecting(ls_range, range)) 899 return 0; 900 901 /* range1 covers only the first byte in the range */ 902 range1 = *range; 903 range1.length = 1; 904 return lo_seg_contained(ls_range, &range1); 905 } 906 907 /* 908 * lookup range in layout 909 */ 910 static struct pnfs_layout_segment * 911 pnfs_find_lseg(struct pnfs_layout_hdr *lo, 912 struct pnfs_layout_range *range) 913 { 914 struct pnfs_layout_segment *lseg, *ret = NULL; 915 916 dprintk("%s:Begin\n", __func__); 917 918 assert_spin_locked(&lo->plh_inode->i_lock); 919 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 920 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && 921 is_matching_lseg(&lseg->pls_range, range)) { 922 ret = get_lseg(lseg); 923 break; 924 } 925 if (lseg->pls_range.offset > range->offset) 926 break; 927 } 928 929 dprintk("%s:Return lseg %p ref %d\n", 930 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0); 931 return ret; 932 } 933 934 /* 935 * Layout segment is retreived from the server if not cached. 936 * The appropriate layout segment is referenced and returned to the caller. 937 */ 938 struct pnfs_layout_segment * 939 pnfs_update_layout(struct inode *ino, 940 struct nfs_open_context *ctx, 941 loff_t pos, 942 u64 count, 943 enum pnfs_iomode iomode, 944 gfp_t gfp_flags) 945 { 946 struct pnfs_layout_range arg = { 947 .iomode = iomode, 948 .offset = pos, 949 .length = count, 950 }; 951 unsigned pg_offset; 952 struct nfs_inode *nfsi = NFS_I(ino); 953 struct nfs_server *server = NFS_SERVER(ino); 954 struct nfs_client *clp = server->nfs_client; 955 struct pnfs_layout_hdr *lo; 956 struct pnfs_layout_segment *lseg = NULL; 957 bool first = false; 958 959 if (!pnfs_enabled_sb(NFS_SERVER(ino))) 960 return NULL; 961 spin_lock(&ino->i_lock); 962 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); 963 if (lo == NULL) { 964 dprintk("%s ERROR: can't get pnfs_layout_hdr\n", __func__); 965 goto out_unlock; 966 } 967 968 /* Do we even need to bother with this? */ 969 if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) || 970 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 971 dprintk("%s matches recall, use MDS\n", __func__); 972 goto out_unlock; 973 } 974 975 /* if LAYOUTGET already failed once we don't try again */ 976 if (test_bit(lo_fail_bit(iomode), &nfsi->layout->plh_flags)) 977 goto out_unlock; 978 979 /* Check to see if the layout for the given range already exists */ 980 lseg = pnfs_find_lseg(lo, &arg); 981 if (lseg) 982 goto out_unlock; 983 984 if (pnfs_layoutgets_blocked(lo, NULL, 0)) 985 goto out_unlock; 986 atomic_inc(&lo->plh_outstanding); 987 988 get_layout_hdr(lo); 989 if (list_empty(&lo->plh_segs)) 990 first = true; 991 spin_unlock(&ino->i_lock); 992 if (first) { 993 /* The lo must be on the clp list if there is any 994 * chance of a CB_LAYOUTRECALL(FILE) coming in. 995 */ 996 spin_lock(&clp->cl_lock); 997 BUG_ON(!list_empty(&lo->plh_layouts)); 998 list_add_tail(&lo->plh_layouts, &server->layouts); 999 spin_unlock(&clp->cl_lock); 1000 } 1001 1002 pg_offset = arg.offset & ~PAGE_CACHE_MASK; 1003 if (pg_offset) { 1004 arg.offset -= pg_offset; 1005 arg.length += pg_offset; 1006 } 1007 if (arg.length != NFS4_MAX_UINT64) 1008 arg.length = PAGE_CACHE_ALIGN(arg.length); 1009 1010 lseg = send_layoutget(lo, ctx, &arg, gfp_flags); 1011 if (!lseg && first) { 1012 spin_lock(&clp->cl_lock); 1013 list_del_init(&lo->plh_layouts); 1014 spin_unlock(&clp->cl_lock); 1015 } 1016 atomic_dec(&lo->plh_outstanding); 1017 put_layout_hdr(lo); 1018 out: 1019 dprintk("%s end, state 0x%lx lseg %p\n", __func__, 1020 nfsi->layout ? nfsi->layout->plh_flags : -1, lseg); 1021 return lseg; 1022 out_unlock: 1023 spin_unlock(&ino->i_lock); 1024 goto out; 1025 } 1026 EXPORT_SYMBOL_GPL(pnfs_update_layout); 1027 1028 int 1029 pnfs_layout_process(struct nfs4_layoutget *lgp) 1030 { 1031 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; 1032 struct nfs4_layoutget_res *res = &lgp->res; 1033 struct pnfs_layout_segment *lseg; 1034 struct inode *ino = lo->plh_inode; 1035 struct nfs_client *clp = NFS_SERVER(ino)->nfs_client; 1036 int status = 0; 1037 1038 /* Inject layout blob into I/O device driver */ 1039 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); 1040 if (!lseg || IS_ERR(lseg)) { 1041 if (!lseg) 1042 status = -ENOMEM; 1043 else 1044 status = PTR_ERR(lseg); 1045 dprintk("%s: Could not allocate layout: error %d\n", 1046 __func__, status); 1047 goto out; 1048 } 1049 1050 spin_lock(&ino->i_lock); 1051 if (test_bit(NFS4CLNT_LAYOUTRECALL, &clp->cl_state) || 1052 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1053 dprintk("%s forget reply due to recall\n", __func__); 1054 goto out_forget_reply; 1055 } 1056 1057 if (pnfs_layoutgets_blocked(lo, &res->stateid, 1)) { 1058 dprintk("%s forget reply due to state\n", __func__); 1059 goto out_forget_reply; 1060 } 1061 init_lseg(lo, lseg); 1062 lseg->pls_range = res->range; 1063 *lgp->lsegpp = get_lseg(lseg); 1064 pnfs_insert_layout(lo, lseg); 1065 1066 if (res->return_on_close) { 1067 set_bit(NFS_LSEG_ROC, &lseg->pls_flags); 1068 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags); 1069 } 1070 1071 /* Done processing layoutget. Set the layout stateid */ 1072 pnfs_set_layout_stateid(lo, &res->stateid, false); 1073 spin_unlock(&ino->i_lock); 1074 out: 1075 return status; 1076 1077 out_forget_reply: 1078 spin_unlock(&ino->i_lock); 1079 lseg->pls_layout = lo; 1080 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 1081 goto out; 1082 } 1083 1084 void 1085 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 1086 { 1087 BUG_ON(pgio->pg_lseg != NULL); 1088 1089 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 1090 req->wb_context, 1091 req_offset(req), 1092 req->wb_bytes, 1093 IOMODE_READ, 1094 GFP_KERNEL); 1095 /* If no lseg, fall back to read through mds */ 1096 if (pgio->pg_lseg == NULL) 1097 nfs_pageio_reset_read_mds(pgio); 1098 1099 } 1100 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); 1101 1102 void 1103 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 1104 { 1105 BUG_ON(pgio->pg_lseg != NULL); 1106 1107 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 1108 req->wb_context, 1109 req_offset(req), 1110 req->wb_bytes, 1111 IOMODE_RW, 1112 GFP_NOFS); 1113 /* If no lseg, fall back to write through mds */ 1114 if (pgio->pg_lseg == NULL) 1115 nfs_pageio_reset_write_mds(pgio); 1116 } 1117 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); 1118 1119 bool 1120 pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode) 1121 { 1122 struct nfs_server *server = NFS_SERVER(inode); 1123 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; 1124 1125 if (ld == NULL) 1126 return false; 1127 nfs_pageio_init(pgio, inode, ld->pg_read_ops, server->rsize, 0); 1128 return true; 1129 } 1130 1131 bool 1132 pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags) 1133 { 1134 struct nfs_server *server = NFS_SERVER(inode); 1135 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; 1136 1137 if (ld == NULL) 1138 return false; 1139 nfs_pageio_init(pgio, inode, ld->pg_write_ops, server->wsize, ioflags); 1140 return true; 1141 } 1142 1143 bool 1144 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev, 1145 struct nfs_page *req) 1146 { 1147 if (pgio->pg_lseg == NULL) 1148 return nfs_generic_pg_test(pgio, prev, req); 1149 1150 /* 1151 * Test if a nfs_page is fully contained in the pnfs_layout_range. 1152 * Note that this test makes several assumptions: 1153 * - that the previous nfs_page in the struct nfs_pageio_descriptor 1154 * is known to lie within the range. 1155 * - that the nfs_page being tested is known to be contiguous with the 1156 * previous nfs_page. 1157 * - Layout ranges are page aligned, so we only have to test the 1158 * start offset of the request. 1159 * 1160 * Please also note that 'end_offset' is actually the offset of the 1161 * first byte that lies outside the pnfs_layout_range. FIXME? 1162 * 1163 */ 1164 return req_offset(req) < end_offset(pgio->pg_lseg->pls_range.offset, 1165 pgio->pg_lseg->pls_range.length); 1166 } 1167 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); 1168 1169 /* 1170 * Called by non rpc-based layout drivers 1171 */ 1172 void pnfs_ld_write_done(struct nfs_write_data *data) 1173 { 1174 if (likely(!data->pnfs_error)) { 1175 pnfs_set_layoutcommit(data); 1176 data->mds_ops->rpc_call_done(&data->task, data); 1177 } else { 1178 put_lseg(data->lseg); 1179 data->lseg = NULL; 1180 dprintk("pnfs write error = %d\n", data->pnfs_error); 1181 } 1182 data->mds_ops->rpc_release(data); 1183 } 1184 EXPORT_SYMBOL_GPL(pnfs_ld_write_done); 1185 1186 static void 1187 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, 1188 struct nfs_write_data *data) 1189 { 1190 list_splice_tail_init(&data->pages, &desc->pg_list); 1191 if (data->req && list_empty(&data->req->wb_list)) 1192 nfs_list_add_request(data->req, &desc->pg_list); 1193 nfs_pageio_reset_write_mds(desc); 1194 desc->pg_recoalesce = 1; 1195 nfs_writedata_release(data); 1196 } 1197 1198 static enum pnfs_try_status 1199 pnfs_try_to_write_data(struct nfs_write_data *wdata, 1200 const struct rpc_call_ops *call_ops, 1201 struct pnfs_layout_segment *lseg, 1202 int how) 1203 { 1204 struct inode *inode = wdata->inode; 1205 enum pnfs_try_status trypnfs; 1206 struct nfs_server *nfss = NFS_SERVER(inode); 1207 1208 wdata->mds_ops = call_ops; 1209 wdata->lseg = get_lseg(lseg); 1210 1211 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, 1212 inode->i_ino, wdata->args.count, wdata->args.offset, how); 1213 1214 trypnfs = nfss->pnfs_curr_ld->write_pagelist(wdata, how); 1215 if (trypnfs == PNFS_NOT_ATTEMPTED) { 1216 put_lseg(wdata->lseg); 1217 wdata->lseg = NULL; 1218 } else 1219 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); 1220 1221 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 1222 return trypnfs; 1223 } 1224 1225 static void 1226 pnfs_do_multiple_writes(struct nfs_pageio_descriptor *desc, struct list_head *head, int how) 1227 { 1228 struct nfs_write_data *data; 1229 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 1230 struct pnfs_layout_segment *lseg = desc->pg_lseg; 1231 1232 desc->pg_lseg = NULL; 1233 while (!list_empty(head)) { 1234 enum pnfs_try_status trypnfs; 1235 1236 data = list_entry(head->next, struct nfs_write_data, list); 1237 list_del_init(&data->list); 1238 1239 trypnfs = pnfs_try_to_write_data(data, call_ops, lseg, how); 1240 if (trypnfs == PNFS_NOT_ATTEMPTED) 1241 pnfs_write_through_mds(desc, data); 1242 } 1243 put_lseg(lseg); 1244 } 1245 1246 int 1247 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 1248 { 1249 LIST_HEAD(head); 1250 int ret; 1251 1252 ret = nfs_generic_flush(desc, &head); 1253 if (ret != 0) { 1254 put_lseg(desc->pg_lseg); 1255 desc->pg_lseg = NULL; 1256 return ret; 1257 } 1258 pnfs_do_multiple_writes(desc, &head, desc->pg_ioflags); 1259 return 0; 1260 } 1261 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); 1262 1263 /* 1264 * Called by non rpc-based layout drivers 1265 */ 1266 void pnfs_ld_read_done(struct nfs_read_data *data) 1267 { 1268 if (likely(!data->pnfs_error)) { 1269 __nfs4_read_done_cb(data); 1270 data->mds_ops->rpc_call_done(&data->task, data); 1271 } else { 1272 put_lseg(data->lseg); 1273 data->lseg = NULL; 1274 dprintk("pnfs write error = %d\n", data->pnfs_error); 1275 } 1276 data->mds_ops->rpc_release(data); 1277 } 1278 EXPORT_SYMBOL_GPL(pnfs_ld_read_done); 1279 1280 static void 1281 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, 1282 struct nfs_read_data *data) 1283 { 1284 list_splice_tail_init(&data->pages, &desc->pg_list); 1285 if (data->req && list_empty(&data->req->wb_list)) 1286 nfs_list_add_request(data->req, &desc->pg_list); 1287 nfs_pageio_reset_read_mds(desc); 1288 desc->pg_recoalesce = 1; 1289 nfs_readdata_release(data); 1290 } 1291 1292 /* 1293 * Call the appropriate parallel I/O subsystem read function. 1294 */ 1295 static enum pnfs_try_status 1296 pnfs_try_to_read_data(struct nfs_read_data *rdata, 1297 const struct rpc_call_ops *call_ops, 1298 struct pnfs_layout_segment *lseg) 1299 { 1300 struct inode *inode = rdata->inode; 1301 struct nfs_server *nfss = NFS_SERVER(inode); 1302 enum pnfs_try_status trypnfs; 1303 1304 rdata->mds_ops = call_ops; 1305 rdata->lseg = get_lseg(lseg); 1306 1307 dprintk("%s: Reading ino:%lu %u@%llu\n", 1308 __func__, inode->i_ino, rdata->args.count, rdata->args.offset); 1309 1310 trypnfs = nfss->pnfs_curr_ld->read_pagelist(rdata); 1311 if (trypnfs == PNFS_NOT_ATTEMPTED) { 1312 put_lseg(rdata->lseg); 1313 rdata->lseg = NULL; 1314 } else { 1315 nfs_inc_stats(inode, NFSIOS_PNFS_READ); 1316 } 1317 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 1318 return trypnfs; 1319 } 1320 1321 static void 1322 pnfs_do_multiple_reads(struct nfs_pageio_descriptor *desc, struct list_head *head) 1323 { 1324 struct nfs_read_data *data; 1325 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 1326 struct pnfs_layout_segment *lseg = desc->pg_lseg; 1327 1328 desc->pg_lseg = NULL; 1329 while (!list_empty(head)) { 1330 enum pnfs_try_status trypnfs; 1331 1332 data = list_entry(head->next, struct nfs_read_data, list); 1333 list_del_init(&data->list); 1334 1335 trypnfs = pnfs_try_to_read_data(data, call_ops, lseg); 1336 if (trypnfs == PNFS_NOT_ATTEMPTED) 1337 pnfs_read_through_mds(desc, data); 1338 } 1339 put_lseg(lseg); 1340 } 1341 1342 int 1343 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) 1344 { 1345 LIST_HEAD(head); 1346 int ret; 1347 1348 ret = nfs_generic_pagein(desc, &head); 1349 if (ret != 0) { 1350 put_lseg(desc->pg_lseg); 1351 desc->pg_lseg = NULL; 1352 return ret; 1353 } 1354 pnfs_do_multiple_reads(desc, &head); 1355 return 0; 1356 } 1357 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); 1358 1359 /* 1360 * There can be multiple RW segments. 1361 */ 1362 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 1363 { 1364 struct pnfs_layout_segment *lseg; 1365 1366 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { 1367 if (lseg->pls_range.iomode == IOMODE_RW && 1368 test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 1369 list_add(&lseg->pls_lc_list, listp); 1370 } 1371 } 1372 1373 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) 1374 { 1375 if (lseg->pls_range.iomode == IOMODE_RW) { 1376 dprintk("%s Setting layout IOMODE_RW fail bit\n", __func__); 1377 set_bit(lo_fail_bit(IOMODE_RW), &lseg->pls_layout->plh_flags); 1378 } else { 1379 dprintk("%s Setting layout IOMODE_READ fail bit\n", __func__); 1380 set_bit(lo_fail_bit(IOMODE_READ), &lseg->pls_layout->plh_flags); 1381 } 1382 } 1383 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); 1384 1385 void 1386 pnfs_set_layoutcommit(struct nfs_write_data *wdata) 1387 { 1388 struct nfs_inode *nfsi = NFS_I(wdata->inode); 1389 loff_t end_pos = wdata->mds_offset + wdata->res.count; 1390 bool mark_as_dirty = false; 1391 1392 spin_lock(&nfsi->vfs_inode.i_lock); 1393 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 1394 mark_as_dirty = true; 1395 dprintk("%s: Set layoutcommit for inode %lu ", 1396 __func__, wdata->inode->i_ino); 1397 } 1398 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &wdata->lseg->pls_flags)) { 1399 /* references matched in nfs4_layoutcommit_release */ 1400 get_lseg(wdata->lseg); 1401 } 1402 if (end_pos > nfsi->layout->plh_lwb) 1403 nfsi->layout->plh_lwb = end_pos; 1404 spin_unlock(&nfsi->vfs_inode.i_lock); 1405 dprintk("%s: lseg %p end_pos %llu\n", 1406 __func__, wdata->lseg, nfsi->layout->plh_lwb); 1407 1408 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one 1409 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ 1410 if (mark_as_dirty) 1411 mark_inode_dirty_sync(wdata->inode); 1412 } 1413 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); 1414 1415 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 1416 { 1417 struct nfs_server *nfss = NFS_SERVER(data->args.inode); 1418 1419 if (nfss->pnfs_curr_ld->cleanup_layoutcommit) 1420 nfss->pnfs_curr_ld->cleanup_layoutcommit(data); 1421 } 1422 1423 /* 1424 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and 1425 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough 1426 * data to disk to allow the server to recover the data if it crashes. 1427 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag 1428 * is off, and a COMMIT is sent to a data server, or 1429 * if WRITEs to a data server return NFS_DATA_SYNC. 1430 */ 1431 int 1432 pnfs_layoutcommit_inode(struct inode *inode, bool sync) 1433 { 1434 struct nfs4_layoutcommit_data *data; 1435 struct nfs_inode *nfsi = NFS_I(inode); 1436 loff_t end_pos; 1437 int status = 0; 1438 1439 dprintk("--> %s inode %lu\n", __func__, inode->i_ino); 1440 1441 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 1442 return 0; 1443 1444 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ 1445 data = kzalloc(sizeof(*data), GFP_NOFS); 1446 if (!data) { 1447 status = -ENOMEM; 1448 goto out; 1449 } 1450 1451 if (!test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 1452 goto out_free; 1453 1454 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { 1455 if (!sync) { 1456 status = -EAGAIN; 1457 goto out_free; 1458 } 1459 status = wait_on_bit_lock(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING, 1460 nfs_wait_bit_killable, TASK_KILLABLE); 1461 if (status) 1462 goto out_free; 1463 } 1464 1465 INIT_LIST_HEAD(&data->lseg_list); 1466 spin_lock(&inode->i_lock); 1467 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 1468 clear_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags); 1469 spin_unlock(&inode->i_lock); 1470 wake_up_bit(&nfsi->flags, NFS_INO_LAYOUTCOMMITTING); 1471 goto out_free; 1472 } 1473 1474 pnfs_list_write_lseg(inode, &data->lseg_list); 1475 1476 end_pos = nfsi->layout->plh_lwb; 1477 nfsi->layout->plh_lwb = 0; 1478 1479 memcpy(&data->args.stateid.data, nfsi->layout->plh_stateid.data, 1480 sizeof(nfsi->layout->plh_stateid.data)); 1481 spin_unlock(&inode->i_lock); 1482 1483 data->args.inode = inode; 1484 data->cred = get_rpccred(nfsi->layout->plh_lc_cred); 1485 nfs_fattr_init(&data->fattr); 1486 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 1487 data->res.fattr = &data->fattr; 1488 data->args.lastbytewritten = end_pos - 1; 1489 data->res.server = NFS_SERVER(inode); 1490 1491 status = nfs4_proc_layoutcommit(data, sync); 1492 out: 1493 if (status) 1494 mark_inode_dirty_sync(inode); 1495 dprintk("<-- %s status %d\n", __func__, status); 1496 return status; 1497 out_free: 1498 kfree(data); 1499 goto out; 1500 } 1501