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#include "nfs4trace.h" 37#include "delegation.h" 38 39#define NFSDBG_FACILITY NFSDBG_PNFS 40#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ) 41 42/* Locking: 43 * 44 * pnfs_spinlock: 45 * protects pnfs_modules_tbl. 46 */ 47static DEFINE_SPINLOCK(pnfs_spinlock); 48 49/* 50 * pnfs_modules_tbl holds all pnfs modules 51 */ 52static LIST_HEAD(pnfs_modules_tbl); 53 54static int 55pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid, 56 enum pnfs_iomode iomode, bool sync); 57 58/* Return the registered pnfs layout driver module matching given id */ 59static struct pnfs_layoutdriver_type * 60find_pnfs_driver_locked(u32 id) 61{ 62 struct pnfs_layoutdriver_type *local; 63 64 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid) 65 if (local->id == id) 66 goto out; 67 local = NULL; 68out: 69 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); 70 return local; 71} 72 73static struct pnfs_layoutdriver_type * 74find_pnfs_driver(u32 id) 75{ 76 struct pnfs_layoutdriver_type *local; 77 78 spin_lock(&pnfs_spinlock); 79 local = find_pnfs_driver_locked(id); 80 if (local != NULL && !try_module_get(local->owner)) { 81 dprintk("%s: Could not grab reference on module\n", __func__); 82 local = NULL; 83 } 84 spin_unlock(&pnfs_spinlock); 85 return local; 86} 87 88void 89unset_pnfs_layoutdriver(struct nfs_server *nfss) 90{ 91 if (nfss->pnfs_curr_ld) { 92 if (nfss->pnfs_curr_ld->clear_layoutdriver) 93 nfss->pnfs_curr_ld->clear_layoutdriver(nfss); 94 /* Decrement the MDS count. Purge the deviceid cache if zero */ 95 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count)) 96 nfs4_deviceid_purge_client(nfss->nfs_client); 97 module_put(nfss->pnfs_curr_ld->owner); 98 } 99 nfss->pnfs_curr_ld = NULL; 100} 101 102/* 103 * Try to set the server's pnfs module to the pnfs layout type specified by id. 104 * Currently only one pNFS layout driver per filesystem is supported. 105 * 106 * @id layout type. Zero (illegal layout type) indicates pNFS not in use. 107 */ 108void 109set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, 110 u32 id) 111{ 112 struct pnfs_layoutdriver_type *ld_type = NULL; 113 114 if (id == 0) 115 goto out_no_driver; 116 if (!(server->nfs_client->cl_exchange_flags & 117 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { 118 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n", 119 __func__, id, server->nfs_client->cl_exchange_flags); 120 goto out_no_driver; 121 } 122 ld_type = find_pnfs_driver(id); 123 if (!ld_type) { 124 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); 125 ld_type = find_pnfs_driver(id); 126 if (!ld_type) { 127 dprintk("%s: No pNFS module found for %u.\n", 128 __func__, id); 129 goto out_no_driver; 130 } 131 } 132 server->pnfs_curr_ld = ld_type; 133 if (ld_type->set_layoutdriver 134 && ld_type->set_layoutdriver(server, mntfh)) { 135 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout " 136 "driver %u.\n", __func__, id); 137 module_put(ld_type->owner); 138 goto out_no_driver; 139 } 140 /* Bump the MDS count */ 141 atomic_inc(&server->nfs_client->cl_mds_count); 142 143 dprintk("%s: pNFS module for %u set\n", __func__, id); 144 return; 145 146out_no_driver: 147 dprintk("%s: Using NFSv4 I/O\n", __func__); 148 server->pnfs_curr_ld = NULL; 149} 150 151int 152pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 153{ 154 int status = -EINVAL; 155 struct pnfs_layoutdriver_type *tmp; 156 157 if (ld_type->id == 0) { 158 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__); 159 return status; 160 } 161 if (!ld_type->alloc_lseg || !ld_type->free_lseg) { 162 printk(KERN_ERR "NFS: %s Layout driver must provide " 163 "alloc_lseg and free_lseg.\n", __func__); 164 return status; 165 } 166 167 spin_lock(&pnfs_spinlock); 168 tmp = find_pnfs_driver_locked(ld_type->id); 169 if (!tmp) { 170 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); 171 status = 0; 172 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, 173 ld_type->name); 174 } else { 175 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n", 176 __func__, ld_type->id); 177 } 178 spin_unlock(&pnfs_spinlock); 179 180 return status; 181} 182EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); 183 184void 185pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 186{ 187 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); 188 spin_lock(&pnfs_spinlock); 189 list_del(&ld_type->pnfs_tblid); 190 spin_unlock(&pnfs_spinlock); 191} 192EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); 193 194/* 195 * pNFS client layout cache 196 */ 197 198/* Need to hold i_lock if caller does not already hold reference */ 199void 200pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo) 201{ 202 atomic_inc(&lo->plh_refcount); 203} 204 205static struct pnfs_layout_hdr * 206pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) 207{ 208 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 209 return ld->alloc_layout_hdr(ino, gfp_flags); 210} 211 212static void 213pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) 214{ 215 struct nfs_server *server = NFS_SERVER(lo->plh_inode); 216 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; 217 218 if (!list_empty(&lo->plh_layouts)) { 219 struct nfs_client *clp = server->nfs_client; 220 221 spin_lock(&clp->cl_lock); 222 list_del_init(&lo->plh_layouts); 223 spin_unlock(&clp->cl_lock); 224 } 225 put_rpccred(lo->plh_lc_cred); 226 return ld->free_layout_hdr(lo); 227} 228 229static void 230pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) 231{ 232 struct nfs_inode *nfsi = NFS_I(lo->plh_inode); 233 dprintk("%s: freeing layout cache %p\n", __func__, lo); 234 nfsi->layout = NULL; 235 /* Reset MDS Threshold I/O counters */ 236 nfsi->write_io = 0; 237 nfsi->read_io = 0; 238} 239 240void 241pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) 242{ 243 struct inode *inode = lo->plh_inode; 244 245 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { 246 if (!list_empty(&lo->plh_segs)) 247 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n"); 248 pnfs_detach_layout_hdr(lo); 249 spin_unlock(&inode->i_lock); 250 pnfs_free_layout_hdr(lo); 251 } 252} 253 254static int 255pnfs_iomode_to_fail_bit(u32 iomode) 256{ 257 return iomode == IOMODE_RW ? 258 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; 259} 260 261static void 262pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 263{ 264 lo->plh_retry_timestamp = jiffies; 265 if (!test_and_set_bit(fail_bit, &lo->plh_flags)) 266 atomic_inc(&lo->plh_refcount); 267} 268 269static void 270pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 271{ 272 if (test_and_clear_bit(fail_bit, &lo->plh_flags)) 273 atomic_dec(&lo->plh_refcount); 274} 275 276static void 277pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) 278{ 279 struct inode *inode = lo->plh_inode; 280 struct pnfs_layout_range range = { 281 .iomode = iomode, 282 .offset = 0, 283 .length = NFS4_MAX_UINT64, 284 }; 285 LIST_HEAD(head); 286 287 spin_lock(&inode->i_lock); 288 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 289 pnfs_mark_matching_lsegs_invalid(lo, &head, &range); 290 spin_unlock(&inode->i_lock); 291 pnfs_free_lseg_list(&head); 292 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, 293 iomode == IOMODE_RW ? "RW" : "READ"); 294} 295 296static bool 297pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) 298{ 299 unsigned long start, end; 300 int fail_bit = pnfs_iomode_to_fail_bit(iomode); 301 302 if (test_bit(fail_bit, &lo->plh_flags) == 0) 303 return false; 304 end = jiffies; 305 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; 306 if (!time_in_range(lo->plh_retry_timestamp, start, end)) { 307 /* It is time to retry the failed layoutgets */ 308 pnfs_layout_clear_fail_bit(lo, fail_bit); 309 return false; 310 } 311 return true; 312} 313 314static void 315init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg) 316{ 317 INIT_LIST_HEAD(&lseg->pls_list); 318 INIT_LIST_HEAD(&lseg->pls_lc_list); 319 atomic_set(&lseg->pls_refcount, 1); 320 smp_mb(); 321 set_bit(NFS_LSEG_VALID, &lseg->pls_flags); 322 lseg->pls_layout = lo; 323} 324 325static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) 326{ 327 struct inode *ino = lseg->pls_layout->plh_inode; 328 329 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 330} 331 332static void 333pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, 334 struct pnfs_layout_segment *lseg) 335{ 336 struct inode *inode = lo->plh_inode; 337 338 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 339 list_del_init(&lseg->pls_list); 340 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ 341 atomic_dec(&lo->plh_refcount); 342 if (list_empty(&lo->plh_segs)) 343 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 344 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq); 345} 346 347/* Return true if layoutreturn is needed */ 348static bool 349pnfs_layout_need_return(struct pnfs_layout_hdr *lo, 350 struct pnfs_layout_segment *lseg) 351{ 352 struct pnfs_layout_segment *s; 353 354 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 355 return false; 356 357 list_for_each_entry(s, &lo->plh_segs, pls_list) 358 if (s != lseg && test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags)) 359 return false; 360 361 return true; 362} 363 364static void pnfs_layoutreturn_before_put_lseg(struct pnfs_layout_segment *lseg, 365 struct pnfs_layout_hdr *lo, struct inode *inode) 366{ 367 lo = lseg->pls_layout; 368 inode = lo->plh_inode; 369 370 spin_lock(&inode->i_lock); 371 if (pnfs_layout_need_return(lo, lseg)) { 372 nfs4_stateid stateid; 373 enum pnfs_iomode iomode; 374 375 stateid = lo->plh_stateid; 376 iomode = lo->plh_return_iomode; 377 /* decreased in pnfs_send_layoutreturn() */ 378 lo->plh_block_lgets++; 379 lo->plh_return_iomode = 0; 380 spin_unlock(&inode->i_lock); 381 pnfs_get_layout_hdr(lo); 382 383 /* Send an async layoutreturn so we dont deadlock */ 384 pnfs_send_layoutreturn(lo, stateid, iomode, false); 385 } else 386 spin_unlock(&inode->i_lock); 387} 388 389void 390pnfs_put_lseg(struct pnfs_layout_segment *lseg) 391{ 392 struct pnfs_layout_hdr *lo; 393 struct inode *inode; 394 395 if (!lseg) 396 return; 397 398 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, 399 atomic_read(&lseg->pls_refcount), 400 test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 401 402 /* Handle the case where refcount != 1 */ 403 if (atomic_add_unless(&lseg->pls_refcount, -1, 1)) 404 return; 405 406 lo = lseg->pls_layout; 407 inode = lo->plh_inode; 408 /* Do we need a layoutreturn? */ 409 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 410 pnfs_layoutreturn_before_put_lseg(lseg, lo, inode); 411 412 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { 413 pnfs_get_layout_hdr(lo); 414 pnfs_layout_remove_lseg(lo, lseg); 415 spin_unlock(&inode->i_lock); 416 pnfs_free_lseg(lseg); 417 pnfs_put_layout_hdr(lo); 418 } 419} 420EXPORT_SYMBOL_GPL(pnfs_put_lseg); 421 422static void pnfs_free_lseg_async_work(struct work_struct *work) 423{ 424 struct pnfs_layout_segment *lseg; 425 struct pnfs_layout_hdr *lo; 426 427 lseg = container_of(work, struct pnfs_layout_segment, pls_work); 428 lo = lseg->pls_layout; 429 430 pnfs_free_lseg(lseg); 431 pnfs_put_layout_hdr(lo); 432} 433 434static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg) 435{ 436 INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work); 437 schedule_work(&lseg->pls_work); 438} 439 440void 441pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg) 442{ 443 if (!lseg) 444 return; 445 446 assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock); 447 448 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, 449 atomic_read(&lseg->pls_refcount), 450 test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 451 if (atomic_dec_and_test(&lseg->pls_refcount)) { 452 struct pnfs_layout_hdr *lo = lseg->pls_layout; 453 pnfs_get_layout_hdr(lo); 454 pnfs_layout_remove_lseg(lo, lseg); 455 pnfs_free_lseg_async(lseg); 456 } 457} 458EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked); 459 460static u64 461end_offset(u64 start, u64 len) 462{ 463 u64 end; 464 465 end = start + len; 466 return end >= start ? end : NFS4_MAX_UINT64; 467} 468 469/* 470 * is l2 fully contained in l1? 471 * start1 end1 472 * [----------------------------------) 473 * start2 end2 474 * [----------------) 475 */ 476static bool 477pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, 478 const struct pnfs_layout_range *l2) 479{ 480 u64 start1 = l1->offset; 481 u64 end1 = end_offset(start1, l1->length); 482 u64 start2 = l2->offset; 483 u64 end2 = end_offset(start2, l2->length); 484 485 return (start1 <= start2) && (end1 >= end2); 486} 487 488/* 489 * is l1 and l2 intersecting? 490 * start1 end1 491 * [----------------------------------) 492 * start2 end2 493 * [----------------) 494 */ 495static bool 496pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1, 497 const struct pnfs_layout_range *l2) 498{ 499 u64 start1 = l1->offset; 500 u64 end1 = end_offset(start1, l1->length); 501 u64 start2 = l2->offset; 502 u64 end2 = end_offset(start2, l2->length); 503 504 return (end1 == NFS4_MAX_UINT64 || end1 > start2) && 505 (end2 == NFS4_MAX_UINT64 || end2 > start1); 506} 507 508static bool 509should_free_lseg(const struct pnfs_layout_range *lseg_range, 510 const struct pnfs_layout_range *recall_range) 511{ 512 return (recall_range->iomode == IOMODE_ANY || 513 lseg_range->iomode == recall_range->iomode) && 514 pnfs_lseg_range_intersecting(lseg_range, recall_range); 515} 516 517static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, 518 struct list_head *tmp_list) 519{ 520 if (!atomic_dec_and_test(&lseg->pls_refcount)) 521 return false; 522 pnfs_layout_remove_lseg(lseg->pls_layout, lseg); 523 list_add(&lseg->pls_list, tmp_list); 524 return true; 525} 526 527/* Returns 1 if lseg is removed from list, 0 otherwise */ 528static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, 529 struct list_head *tmp_list) 530{ 531 int rv = 0; 532 533 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 534 /* Remove the reference keeping the lseg in the 535 * list. It will now be removed when all 536 * outstanding io is finished. 537 */ 538 dprintk("%s: lseg %p ref %d\n", __func__, lseg, 539 atomic_read(&lseg->pls_refcount)); 540 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) 541 rv = 1; 542 } 543 return rv; 544} 545 546/* Returns count of number of matching invalid lsegs remaining in list 547 * after call. 548 */ 549int 550pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 551 struct list_head *tmp_list, 552 struct pnfs_layout_range *recall_range) 553{ 554 struct pnfs_layout_segment *lseg, *next; 555 int invalid = 0, removed = 0; 556 557 dprintk("%s:Begin lo %p\n", __func__, lo); 558 559 if (list_empty(&lo->plh_segs)) 560 return 0; 561 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 562 if (!recall_range || 563 should_free_lseg(&lseg->pls_range, recall_range)) { 564 dprintk("%s: freeing lseg %p iomode %d " 565 "offset %llu length %llu\n", __func__, 566 lseg, lseg->pls_range.iomode, lseg->pls_range.offset, 567 lseg->pls_range.length); 568 invalid++; 569 removed += mark_lseg_invalid(lseg, tmp_list); 570 } 571 dprintk("%s:Return %i\n", __func__, invalid - removed); 572 return invalid - removed; 573} 574 575/* note free_me must contain lsegs from a single layout_hdr */ 576void 577pnfs_free_lseg_list(struct list_head *free_me) 578{ 579 struct pnfs_layout_segment *lseg, *tmp; 580 581 if (list_empty(free_me)) 582 return; 583 584 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { 585 list_del(&lseg->pls_list); 586 pnfs_free_lseg(lseg); 587 } 588} 589 590void 591pnfs_destroy_layout(struct nfs_inode *nfsi) 592{ 593 struct pnfs_layout_hdr *lo; 594 LIST_HEAD(tmp_list); 595 596 spin_lock(&nfsi->vfs_inode.i_lock); 597 lo = nfsi->layout; 598 if (lo) { 599 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */ 600 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL); 601 pnfs_get_layout_hdr(lo); 602 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); 603 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); 604 pnfs_clear_retry_layoutget(lo); 605 spin_unlock(&nfsi->vfs_inode.i_lock); 606 pnfs_free_lseg_list(&tmp_list); 607 pnfs_put_layout_hdr(lo); 608 } else 609 spin_unlock(&nfsi->vfs_inode.i_lock); 610} 611EXPORT_SYMBOL_GPL(pnfs_destroy_layout); 612 613static bool 614pnfs_layout_add_bulk_destroy_list(struct inode *inode, 615 struct list_head *layout_list) 616{ 617 struct pnfs_layout_hdr *lo; 618 bool ret = false; 619 620 spin_lock(&inode->i_lock); 621 lo = NFS_I(inode)->layout; 622 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) { 623 pnfs_get_layout_hdr(lo); 624 list_add(&lo->plh_bulk_destroy, layout_list); 625 ret = true; 626 } 627 spin_unlock(&inode->i_lock); 628 return ret; 629} 630 631/* Caller must hold rcu_read_lock and clp->cl_lock */ 632static int 633pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp, 634 struct nfs_server *server, 635 struct list_head *layout_list) 636{ 637 struct pnfs_layout_hdr *lo, *next; 638 struct inode *inode; 639 640 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) { 641 inode = igrab(lo->plh_inode); 642 if (inode == NULL) 643 continue; 644 list_del_init(&lo->plh_layouts); 645 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list)) 646 continue; 647 rcu_read_unlock(); 648 spin_unlock(&clp->cl_lock); 649 iput(inode); 650 spin_lock(&clp->cl_lock); 651 rcu_read_lock(); 652 return -EAGAIN; 653 } 654 return 0; 655} 656 657static int 658pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, 659 bool is_bulk_recall) 660{ 661 struct pnfs_layout_hdr *lo; 662 struct inode *inode; 663 struct pnfs_layout_range range = { 664 .iomode = IOMODE_ANY, 665 .offset = 0, 666 .length = NFS4_MAX_UINT64, 667 }; 668 LIST_HEAD(lseg_list); 669 int ret = 0; 670 671 while (!list_empty(layout_list)) { 672 lo = list_entry(layout_list->next, struct pnfs_layout_hdr, 673 plh_bulk_destroy); 674 dprintk("%s freeing layout for inode %lu\n", __func__, 675 lo->plh_inode->i_ino); 676 inode = lo->plh_inode; 677 678 pnfs_layoutcommit_inode(inode, false); 679 680 spin_lock(&inode->i_lock); 681 list_del_init(&lo->plh_bulk_destroy); 682 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */ 683 if (is_bulk_recall) 684 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 685 if (pnfs_mark_matching_lsegs_invalid(lo, &lseg_list, &range)) 686 ret = -EAGAIN; 687 spin_unlock(&inode->i_lock); 688 pnfs_free_lseg_list(&lseg_list); 689 pnfs_put_layout_hdr(lo); 690 iput(inode); 691 } 692 return ret; 693} 694 695int 696pnfs_destroy_layouts_byfsid(struct nfs_client *clp, 697 struct nfs_fsid *fsid, 698 bool is_recall) 699{ 700 struct nfs_server *server; 701 LIST_HEAD(layout_list); 702 703 spin_lock(&clp->cl_lock); 704 rcu_read_lock(); 705restart: 706 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 707 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0) 708 continue; 709 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 710 server, 711 &layout_list) != 0) 712 goto restart; 713 } 714 rcu_read_unlock(); 715 spin_unlock(&clp->cl_lock); 716 717 if (list_empty(&layout_list)) 718 return 0; 719 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 720} 721 722int 723pnfs_destroy_layouts_byclid(struct nfs_client *clp, 724 bool is_recall) 725{ 726 struct nfs_server *server; 727 LIST_HEAD(layout_list); 728 729 spin_lock(&clp->cl_lock); 730 rcu_read_lock(); 731restart: 732 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 733 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 734 server, 735 &layout_list) != 0) 736 goto restart; 737 } 738 rcu_read_unlock(); 739 spin_unlock(&clp->cl_lock); 740 741 if (list_empty(&layout_list)) 742 return 0; 743 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 744} 745 746/* 747 * Called by the state manger to remove all layouts established under an 748 * expired lease. 749 */ 750void 751pnfs_destroy_all_layouts(struct nfs_client *clp) 752{ 753 nfs4_deviceid_mark_client_invalid(clp); 754 nfs4_deviceid_purge_client(clp); 755 756 pnfs_destroy_layouts_byclid(clp, false); 757} 758 759/* 760 * Compare 2 layout stateid sequence ids, to see which is newer, 761 * taking into account wraparound issues. 762 */ 763static bool pnfs_seqid_is_newer(u32 s1, u32 s2) 764{ 765 return (s32)(s1 - s2) > 0; 766} 767 768/* update lo->plh_stateid with new if is more recent */ 769void 770pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, 771 bool update_barrier) 772{ 773 u32 oldseq, newseq, new_barrier; 774 int empty = list_empty(&lo->plh_segs); 775 776 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 777 newseq = be32_to_cpu(new->seqid); 778 if (empty || pnfs_seqid_is_newer(newseq, oldseq)) { 779 nfs4_stateid_copy(&lo->plh_stateid, new); 780 if (update_barrier) { 781 new_barrier = be32_to_cpu(new->seqid); 782 } else { 783 /* Because of wraparound, we want to keep the barrier 784 * "close" to the current seqids. 785 */ 786 new_barrier = newseq - atomic_read(&lo->plh_outstanding); 787 } 788 if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier)) 789 lo->plh_barrier = new_barrier; 790 } 791} 792 793static bool 794pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, 795 const nfs4_stateid *stateid) 796{ 797 u32 seqid = be32_to_cpu(stateid->seqid); 798 799 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier); 800} 801 802static bool 803pnfs_layout_returning(const struct pnfs_layout_hdr *lo, 804 struct pnfs_layout_range *range) 805{ 806 return test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) && 807 (lo->plh_return_iomode == IOMODE_ANY || 808 lo->plh_return_iomode == range->iomode); 809} 810 811/* lget is set to 1 if called from inside send_layoutget call chain */ 812static bool 813pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo, 814 struct pnfs_layout_range *range, int lget) 815{ 816 return lo->plh_block_lgets || 817 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || 818 (list_empty(&lo->plh_segs) && 819 (atomic_read(&lo->plh_outstanding) > lget)) || 820 pnfs_layout_returning(lo, range); 821} 822 823int 824pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, 825 struct pnfs_layout_range *range, 826 struct nfs4_state *open_state) 827{ 828 int status = 0; 829 830 dprintk("--> %s\n", __func__); 831 spin_lock(&lo->plh_inode->i_lock); 832 if (pnfs_layoutgets_blocked(lo, range, 1)) { 833 status = -EAGAIN; 834 } else if (!nfs4_valid_open_stateid(open_state)) { 835 status = -EBADF; 836 } else if (list_empty(&lo->plh_segs) || 837 test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { 838 int seq; 839 840 do { 841 seq = read_seqbegin(&open_state->seqlock); 842 nfs4_stateid_copy(dst, &open_state->stateid); 843 } while (read_seqretry(&open_state->seqlock, seq)); 844 } else 845 nfs4_stateid_copy(dst, &lo->plh_stateid); 846 spin_unlock(&lo->plh_inode->i_lock); 847 dprintk("<-- %s\n", __func__); 848 return status; 849} 850 851/* 852* Get layout from server. 853* for now, assume that whole file layouts are requested. 854* arg->offset: 0 855* arg->length: all ones 856*/ 857static struct pnfs_layout_segment * 858send_layoutget(struct pnfs_layout_hdr *lo, 859 struct nfs_open_context *ctx, 860 struct pnfs_layout_range *range, 861 gfp_t gfp_flags) 862{ 863 struct inode *ino = lo->plh_inode; 864 struct nfs_server *server = NFS_SERVER(ino); 865 struct nfs4_layoutget *lgp; 866 struct pnfs_layout_segment *lseg; 867 868 dprintk("--> %s\n", __func__); 869 870 lgp = kzalloc(sizeof(*lgp), gfp_flags); 871 if (lgp == NULL) 872 return NULL; 873 874 lgp->args.minlength = PAGE_CACHE_SIZE; 875 if (lgp->args.minlength > range->length) 876 lgp->args.minlength = range->length; 877 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; 878 lgp->args.range = *range; 879 lgp->args.type = server->pnfs_curr_ld->id; 880 lgp->args.inode = ino; 881 lgp->args.ctx = get_nfs_open_context(ctx); 882 lgp->gfp_flags = gfp_flags; 883 lgp->cred = lo->plh_lc_cred; 884 885 /* Synchronously retrieve layout information from server and 886 * store in lseg. 887 */ 888 lseg = nfs4_proc_layoutget(lgp, gfp_flags); 889 if (IS_ERR(lseg)) { 890 switch (PTR_ERR(lseg)) { 891 case -ENOMEM: 892 case -ERESTARTSYS: 893 break; 894 default: 895 /* remember that LAYOUTGET failed and suspend trying */ 896 pnfs_layout_io_set_failed(lo, range->iomode); 897 } 898 return NULL; 899 } else 900 pnfs_layout_clear_fail_bit(lo, 901 pnfs_iomode_to_fail_bit(range->iomode)); 902 903 return lseg; 904} 905 906static void pnfs_clear_layoutcommit(struct inode *inode, 907 struct list_head *head) 908{ 909 struct nfs_inode *nfsi = NFS_I(inode); 910 struct pnfs_layout_segment *lseg, *tmp; 911 912 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 913 return; 914 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { 915 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 916 continue; 917 pnfs_lseg_dec_and_remove_zero(lseg, head); 918 } 919} 920 921void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) 922{ 923 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); 924 smp_mb__after_atomic(); 925 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); 926} 927 928static int 929pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid, 930 enum pnfs_iomode iomode, bool sync) 931{ 932 struct inode *ino = lo->plh_inode; 933 struct nfs4_layoutreturn *lrp; 934 int status = 0; 935 936 lrp = kzalloc(sizeof(*lrp), GFP_NOFS); 937 if (unlikely(lrp == NULL)) { 938 status = -ENOMEM; 939 spin_lock(&ino->i_lock); 940 lo->plh_block_lgets--; 941 pnfs_clear_layoutreturn_waitbit(lo); 942 rpc_wake_up(&NFS_SERVER(ino)->roc_rpcwaitq); 943 spin_unlock(&ino->i_lock); 944 pnfs_put_layout_hdr(lo); 945 goto out; 946 } 947 948 lrp->args.stateid = stateid; 949 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id; 950 lrp->args.inode = ino; 951 lrp->args.range.iomode = iomode; 952 lrp->args.range.offset = 0; 953 lrp->args.range.length = NFS4_MAX_UINT64; 954 lrp->args.layout = lo; 955 lrp->clp = NFS_SERVER(ino)->nfs_client; 956 lrp->cred = lo->plh_lc_cred; 957 958 status = nfs4_proc_layoutreturn(lrp, sync); 959out: 960 dprintk("<-- %s status: %d\n", __func__, status); 961 return status; 962} 963 964/* 965 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr 966 * when the layout segment list is empty. 967 * 968 * Note that a pnfs_layout_hdr can exist with an empty layout segment 969 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the 970 * deviceid is marked invalid. 971 */ 972int 973_pnfs_return_layout(struct inode *ino) 974{ 975 struct pnfs_layout_hdr *lo = NULL; 976 struct nfs_inode *nfsi = NFS_I(ino); 977 LIST_HEAD(tmp_list); 978 nfs4_stateid stateid; 979 int status = 0, empty; 980 981 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); 982 983 spin_lock(&ino->i_lock); 984 lo = nfsi->layout; 985 if (!lo) { 986 spin_unlock(&ino->i_lock); 987 dprintk("NFS: %s no layout to return\n", __func__); 988 goto out; 989 } 990 stateid = nfsi->layout->plh_stateid; 991 /* Reference matched in nfs4_layoutreturn_release */ 992 pnfs_get_layout_hdr(lo); 993 empty = list_empty(&lo->plh_segs); 994 pnfs_clear_layoutcommit(ino, &tmp_list); 995 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL); 996 997 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 998 struct pnfs_layout_range range = { 999 .iomode = IOMODE_ANY, 1000 .offset = 0, 1001 .length = NFS4_MAX_UINT64, 1002 }; 1003 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); 1004 } 1005 1006 /* Don't send a LAYOUTRETURN if list was initially empty */ 1007 if (empty) { 1008 spin_unlock(&ino->i_lock); 1009 pnfs_put_layout_hdr(lo); 1010 dprintk("NFS: %s no layout segments to return\n", __func__); 1011 goto out; 1012 } 1013 1014 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 1015 lo->plh_block_lgets++; 1016 spin_unlock(&ino->i_lock); 1017 pnfs_free_lseg_list(&tmp_list); 1018 1019 status = pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true); 1020out: 1021 dprintk("<-- %s status: %d\n", __func__, status); 1022 return status; 1023} 1024EXPORT_SYMBOL_GPL(_pnfs_return_layout); 1025 1026int 1027pnfs_commit_and_return_layout(struct inode *inode) 1028{ 1029 struct pnfs_layout_hdr *lo; 1030 int ret; 1031 1032 spin_lock(&inode->i_lock); 1033 lo = NFS_I(inode)->layout; 1034 if (lo == NULL) { 1035 spin_unlock(&inode->i_lock); 1036 return 0; 1037 } 1038 pnfs_get_layout_hdr(lo); 1039 /* Block new layoutgets and read/write to ds */ 1040 lo->plh_block_lgets++; 1041 spin_unlock(&inode->i_lock); 1042 filemap_fdatawait(inode->i_mapping); 1043 ret = pnfs_layoutcommit_inode(inode, true); 1044 if (ret == 0) 1045 ret = _pnfs_return_layout(inode); 1046 spin_lock(&inode->i_lock); 1047 lo->plh_block_lgets--; 1048 spin_unlock(&inode->i_lock); 1049 pnfs_put_layout_hdr(lo); 1050 return ret; 1051} 1052 1053bool pnfs_roc(struct inode *ino) 1054{ 1055 struct nfs_inode *nfsi = NFS_I(ino); 1056 struct nfs_open_context *ctx; 1057 struct nfs4_state *state; 1058 struct pnfs_layout_hdr *lo; 1059 struct pnfs_layout_segment *lseg, *tmp; 1060 nfs4_stateid stateid; 1061 LIST_HEAD(tmp_list); 1062 bool found = false, layoutreturn = false; 1063 1064 spin_lock(&ino->i_lock); 1065 lo = nfsi->layout; 1066 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) || 1067 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) 1068 goto out_noroc; 1069 1070 /* Don't return layout if we hold a delegation */ 1071 if (nfs4_check_delegation(ino, FMODE_READ)) 1072 goto out_noroc; 1073 1074 list_for_each_entry(ctx, &nfsi->open_files, list) { 1075 state = ctx->state; 1076 /* Don't return layout if there is open file state */ 1077 if (state != NULL && state->state != 0) 1078 goto out_noroc; 1079 } 1080 1081 pnfs_clear_retry_layoutget(lo); 1082 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list) 1083 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { 1084 mark_lseg_invalid(lseg, &tmp_list); 1085 found = true; 1086 } 1087 if (!found) 1088 goto out_noroc; 1089 lo->plh_block_lgets++; 1090 pnfs_get_layout_hdr(lo); /* matched in pnfs_roc_release */ 1091 spin_unlock(&ino->i_lock); 1092 pnfs_free_lseg_list(&tmp_list); 1093 pnfs_layoutcommit_inode(ino, true); 1094 return true; 1095 1096out_noroc: 1097 if (lo) { 1098 stateid = lo->plh_stateid; 1099 layoutreturn = 1100 test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, 1101 &lo->plh_flags); 1102 if (layoutreturn) { 1103 lo->plh_block_lgets++; 1104 pnfs_get_layout_hdr(lo); 1105 } 1106 } 1107 spin_unlock(&ino->i_lock); 1108 if (layoutreturn) { 1109 pnfs_layoutcommit_inode(ino, true); 1110 pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true); 1111 } 1112 return false; 1113} 1114 1115void pnfs_roc_release(struct inode *ino) 1116{ 1117 struct pnfs_layout_hdr *lo; 1118 1119 spin_lock(&ino->i_lock); 1120 lo = NFS_I(ino)->layout; 1121 lo->plh_block_lgets--; 1122 if (atomic_dec_and_test(&lo->plh_refcount)) { 1123 pnfs_detach_layout_hdr(lo); 1124 spin_unlock(&ino->i_lock); 1125 pnfs_free_layout_hdr(lo); 1126 } else 1127 spin_unlock(&ino->i_lock); 1128} 1129 1130void pnfs_roc_set_barrier(struct inode *ino, u32 barrier) 1131{ 1132 struct pnfs_layout_hdr *lo; 1133 1134 spin_lock(&ino->i_lock); 1135 lo = NFS_I(ino)->layout; 1136 if (pnfs_seqid_is_newer(barrier, lo->plh_barrier)) 1137 lo->plh_barrier = barrier; 1138 spin_unlock(&ino->i_lock); 1139} 1140 1141bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task) 1142{ 1143 struct nfs_inode *nfsi = NFS_I(ino); 1144 struct pnfs_layout_hdr *lo; 1145 struct pnfs_layout_segment *lseg; 1146 nfs4_stateid stateid; 1147 u32 current_seqid; 1148 bool found = false, layoutreturn = false; 1149 1150 spin_lock(&ino->i_lock); 1151 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list) 1152 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { 1153 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1154 found = true; 1155 goto out; 1156 } 1157 lo = nfsi->layout; 1158 current_seqid = be32_to_cpu(lo->plh_stateid.seqid); 1159 1160 /* Since close does not return a layout stateid for use as 1161 * a barrier, we choose the worst-case barrier. 1162 */ 1163 *barrier = current_seqid + atomic_read(&lo->plh_outstanding); 1164out: 1165 if (!found) { 1166 stateid = lo->plh_stateid; 1167 layoutreturn = 1168 test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, 1169 &lo->plh_flags); 1170 if (layoutreturn) { 1171 lo->plh_block_lgets++; 1172 pnfs_get_layout_hdr(lo); 1173 } 1174 } 1175 spin_unlock(&ino->i_lock); 1176 if (layoutreturn) { 1177 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1178 pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, false); 1179 } 1180 return found; 1181} 1182 1183/* 1184 * Compare two layout segments for sorting into layout cache. 1185 * We want to preferentially return RW over RO layouts, so ensure those 1186 * are seen first. 1187 */ 1188static s64 1189pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, 1190 const struct pnfs_layout_range *l2) 1191{ 1192 s64 d; 1193 1194 /* high offset > low offset */ 1195 d = l1->offset - l2->offset; 1196 if (d) 1197 return d; 1198 1199 /* short length > long length */ 1200 d = l2->length - l1->length; 1201 if (d) 1202 return d; 1203 1204 /* read > read/write */ 1205 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); 1206} 1207 1208static void 1209pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1210 struct pnfs_layout_segment *lseg) 1211{ 1212 struct pnfs_layout_segment *lp; 1213 1214 dprintk("%s:Begin\n", __func__); 1215 1216 list_for_each_entry(lp, &lo->plh_segs, pls_list) { 1217 if (pnfs_lseg_range_cmp(&lseg->pls_range, &lp->pls_range) > 0) 1218 continue; 1219 list_add_tail(&lseg->pls_list, &lp->pls_list); 1220 dprintk("%s: inserted lseg %p " 1221 "iomode %d offset %llu length %llu before " 1222 "lp %p iomode %d offset %llu length %llu\n", 1223 __func__, lseg, lseg->pls_range.iomode, 1224 lseg->pls_range.offset, lseg->pls_range.length, 1225 lp, lp->pls_range.iomode, lp->pls_range.offset, 1226 lp->pls_range.length); 1227 goto out; 1228 } 1229 list_add_tail(&lseg->pls_list, &lo->plh_segs); 1230 dprintk("%s: inserted lseg %p " 1231 "iomode %d offset %llu length %llu at tail\n", 1232 __func__, lseg, lseg->pls_range.iomode, 1233 lseg->pls_range.offset, lseg->pls_range.length); 1234out: 1235 pnfs_get_layout_hdr(lo); 1236 1237 dprintk("%s:Return\n", __func__); 1238} 1239 1240static struct pnfs_layout_hdr * 1241alloc_init_layout_hdr(struct inode *ino, 1242 struct nfs_open_context *ctx, 1243 gfp_t gfp_flags) 1244{ 1245 struct pnfs_layout_hdr *lo; 1246 1247 lo = pnfs_alloc_layout_hdr(ino, gfp_flags); 1248 if (!lo) 1249 return NULL; 1250 atomic_set(&lo->plh_refcount, 1); 1251 INIT_LIST_HEAD(&lo->plh_layouts); 1252 INIT_LIST_HEAD(&lo->plh_segs); 1253 INIT_LIST_HEAD(&lo->plh_bulk_destroy); 1254 lo->plh_inode = ino; 1255 lo->plh_lc_cred = get_rpccred(ctx->cred); 1256 return lo; 1257} 1258 1259static struct pnfs_layout_hdr * 1260pnfs_find_alloc_layout(struct inode *ino, 1261 struct nfs_open_context *ctx, 1262 gfp_t gfp_flags) 1263{ 1264 struct nfs_inode *nfsi = NFS_I(ino); 1265 struct pnfs_layout_hdr *new = NULL; 1266 1267 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); 1268 1269 if (nfsi->layout != NULL) 1270 goto out_existing; 1271 spin_unlock(&ino->i_lock); 1272 new = alloc_init_layout_hdr(ino, ctx, gfp_flags); 1273 spin_lock(&ino->i_lock); 1274 1275 if (likely(nfsi->layout == NULL)) { /* Won the race? */ 1276 nfsi->layout = new; 1277 return new; 1278 } else if (new != NULL) 1279 pnfs_free_layout_hdr(new); 1280out_existing: 1281 pnfs_get_layout_hdr(nfsi->layout); 1282 return nfsi->layout; 1283} 1284 1285/* 1286 * iomode matching rules: 1287 * iomode lseg match 1288 * ----- ----- ----- 1289 * ANY READ true 1290 * ANY RW true 1291 * RW READ false 1292 * RW RW true 1293 * READ READ true 1294 * READ RW true 1295 */ 1296static bool 1297pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, 1298 const struct pnfs_layout_range *range) 1299{ 1300 struct pnfs_layout_range range1; 1301 1302 if ((range->iomode == IOMODE_RW && 1303 ls_range->iomode != IOMODE_RW) || 1304 !pnfs_lseg_range_intersecting(ls_range, range)) 1305 return 0; 1306 1307 /* range1 covers only the first byte in the range */ 1308 range1 = *range; 1309 range1.length = 1; 1310 return pnfs_lseg_range_contained(ls_range, &range1); 1311} 1312 1313/* 1314 * lookup range in layout 1315 */ 1316static struct pnfs_layout_segment * 1317pnfs_find_lseg(struct pnfs_layout_hdr *lo, 1318 struct pnfs_layout_range *range) 1319{ 1320 struct pnfs_layout_segment *lseg, *ret = NULL; 1321 1322 dprintk("%s:Begin\n", __func__); 1323 1324 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 1325 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && 1326 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) && 1327 pnfs_lseg_range_match(&lseg->pls_range, range)) { 1328 ret = pnfs_get_lseg(lseg); 1329 break; 1330 } 1331 if (lseg->pls_range.offset > range->offset) 1332 break; 1333 } 1334 1335 dprintk("%s:Return lseg %p ref %d\n", 1336 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0); 1337 return ret; 1338} 1339 1340/* 1341 * Use mdsthreshold hints set at each OPEN to determine if I/O should go 1342 * to the MDS or over pNFS 1343 * 1344 * The nfs_inode read_io and write_io fields are cumulative counters reset 1345 * when there are no layout segments. Note that in pnfs_update_layout iomode 1346 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a 1347 * WRITE request. 1348 * 1349 * A return of true means use MDS I/O. 1350 * 1351 * From rfc 5661: 1352 * If a file's size is smaller than the file size threshold, data accesses 1353 * SHOULD be sent to the metadata server. If an I/O request has a length that 1354 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata 1355 * server. If both file size and I/O size are provided, the client SHOULD 1356 * reach or exceed both thresholds before sending its read or write 1357 * requests to the data server. 1358 */ 1359static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, 1360 struct inode *ino, int iomode) 1361{ 1362 struct nfs4_threshold *t = ctx->mdsthreshold; 1363 struct nfs_inode *nfsi = NFS_I(ino); 1364 loff_t fsize = i_size_read(ino); 1365 bool size = false, size_set = false, io = false, io_set = false, ret = false; 1366 1367 if (t == NULL) 1368 return ret; 1369 1370 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", 1371 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); 1372 1373 switch (iomode) { 1374 case IOMODE_READ: 1375 if (t->bm & THRESHOLD_RD) { 1376 dprintk("%s fsize %llu\n", __func__, fsize); 1377 size_set = true; 1378 if (fsize < t->rd_sz) 1379 size = true; 1380 } 1381 if (t->bm & THRESHOLD_RD_IO) { 1382 dprintk("%s nfsi->read_io %llu\n", __func__, 1383 nfsi->read_io); 1384 io_set = true; 1385 if (nfsi->read_io < t->rd_io_sz) 1386 io = true; 1387 } 1388 break; 1389 case IOMODE_RW: 1390 if (t->bm & THRESHOLD_WR) { 1391 dprintk("%s fsize %llu\n", __func__, fsize); 1392 size_set = true; 1393 if (fsize < t->wr_sz) 1394 size = true; 1395 } 1396 if (t->bm & THRESHOLD_WR_IO) { 1397 dprintk("%s nfsi->write_io %llu\n", __func__, 1398 nfsi->write_io); 1399 io_set = true; 1400 if (nfsi->write_io < t->wr_io_sz) 1401 io = true; 1402 } 1403 break; 1404 } 1405 if (size_set && io_set) { 1406 if (size && io) 1407 ret = true; 1408 } else if (size || io) 1409 ret = true; 1410 1411 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); 1412 return ret; 1413} 1414 1415/* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */ 1416static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key) 1417{ 1418 if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags)) 1419 return 1; 1420 return nfs_wait_bit_killable(key); 1421} 1422 1423static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) 1424{ 1425 /* 1426 * send layoutcommit as it can hold up layoutreturn due to lseg 1427 * reference 1428 */ 1429 pnfs_layoutcommit_inode(lo->plh_inode, false); 1430 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, 1431 pnfs_layoutget_retry_bit_wait, 1432 TASK_UNINTERRUPTIBLE); 1433} 1434 1435static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) 1436{ 1437 unsigned long *bitlock = &lo->plh_flags; 1438 1439 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); 1440 smp_mb__after_atomic(); 1441 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); 1442} 1443 1444/* 1445 * Layout segment is retreived from the server if not cached. 1446 * The appropriate layout segment is referenced and returned to the caller. 1447 */ 1448struct pnfs_layout_segment * 1449pnfs_update_layout(struct inode *ino, 1450 struct nfs_open_context *ctx, 1451 loff_t pos, 1452 u64 count, 1453 enum pnfs_iomode iomode, 1454 gfp_t gfp_flags) 1455{ 1456 struct pnfs_layout_range arg = { 1457 .iomode = iomode, 1458 .offset = pos, 1459 .length = count, 1460 }; 1461 unsigned pg_offset; 1462 struct nfs_server *server = NFS_SERVER(ino); 1463 struct nfs_client *clp = server->nfs_client; 1464 struct pnfs_layout_hdr *lo; 1465 struct pnfs_layout_segment *lseg = NULL; 1466 bool first; 1467 1468 if (!pnfs_enabled_sb(NFS_SERVER(ino))) 1469 goto out; 1470 1471 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) 1472 goto out; 1473 1474lookup_again: 1475 first = false; 1476 spin_lock(&ino->i_lock); 1477 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); 1478 if (lo == NULL) { 1479 spin_unlock(&ino->i_lock); 1480 goto out; 1481 } 1482 1483 /* Do we even need to bother with this? */ 1484 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1485 dprintk("%s matches recall, use MDS\n", __func__); 1486 goto out_unlock; 1487 } 1488 1489 /* if LAYOUTGET already failed once we don't try again */ 1490 if (pnfs_layout_io_test_failed(lo, iomode) && 1491 !pnfs_should_retry_layoutget(lo)) 1492 goto out_unlock; 1493 1494 first = list_empty(&lo->plh_segs); 1495 if (first) { 1496 /* The first layoutget for the file. Need to serialize per 1497 * RFC 5661 Errata 3208. 1498 */ 1499 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, 1500 &lo->plh_flags)) { 1501 spin_unlock(&ino->i_lock); 1502 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET, 1503 TASK_UNINTERRUPTIBLE); 1504 pnfs_put_layout_hdr(lo); 1505 goto lookup_again; 1506 } 1507 } else { 1508 /* Check to see if the layout for the given range 1509 * already exists 1510 */ 1511 lseg = pnfs_find_lseg(lo, &arg); 1512 if (lseg) 1513 goto out_unlock; 1514 } 1515 1516 /* 1517 * Because we free lsegs before sending LAYOUTRETURN, we need to wait 1518 * for LAYOUTRETURN even if first is true. 1519 */ 1520 if (!lseg && pnfs_should_retry_layoutget(lo) && 1521 test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1522 spin_unlock(&ino->i_lock); 1523 dprintk("%s wait for layoutreturn\n", __func__); 1524 if (pnfs_prepare_to_retry_layoutget(lo)) { 1525 if (first) 1526 pnfs_clear_first_layoutget(lo); 1527 pnfs_put_layout_hdr(lo); 1528 dprintk("%s retrying\n", __func__); 1529 goto lookup_again; 1530 } 1531 goto out_put_layout_hdr; 1532 } 1533 1534 if (pnfs_layoutgets_blocked(lo, &arg, 0)) 1535 goto out_unlock; 1536 atomic_inc(&lo->plh_outstanding); 1537 spin_unlock(&ino->i_lock); 1538 1539 if (list_empty(&lo->plh_layouts)) { 1540 /* The lo must be on the clp list if there is any 1541 * chance of a CB_LAYOUTRECALL(FILE) coming in. 1542 */ 1543 spin_lock(&clp->cl_lock); 1544 if (list_empty(&lo->plh_layouts)) 1545 list_add_tail(&lo->plh_layouts, &server->layouts); 1546 spin_unlock(&clp->cl_lock); 1547 } 1548 1549 pg_offset = arg.offset & ~PAGE_CACHE_MASK; 1550 if (pg_offset) { 1551 arg.offset -= pg_offset; 1552 arg.length += pg_offset; 1553 } 1554 if (arg.length != NFS4_MAX_UINT64) 1555 arg.length = PAGE_CACHE_ALIGN(arg.length); 1556 1557 lseg = send_layoutget(lo, ctx, &arg, gfp_flags); 1558 pnfs_clear_retry_layoutget(lo); 1559 atomic_dec(&lo->plh_outstanding); 1560out_put_layout_hdr: 1561 if (first) 1562 pnfs_clear_first_layoutget(lo); 1563 pnfs_put_layout_hdr(lo); 1564out: 1565 dprintk("%s: inode %s/%llu pNFS layout segment %s for " 1566 "(%s, offset: %llu, length: %llu)\n", 1567 __func__, ino->i_sb->s_id, 1568 (unsigned long long)NFS_FILEID(ino), 1569 lseg == NULL ? "not found" : "found", 1570 iomode==IOMODE_RW ? "read/write" : "read-only", 1571 (unsigned long long)pos, 1572 (unsigned long long)count); 1573 return lseg; 1574out_unlock: 1575 spin_unlock(&ino->i_lock); 1576 goto out_put_layout_hdr; 1577} 1578EXPORT_SYMBOL_GPL(pnfs_update_layout); 1579 1580struct pnfs_layout_segment * 1581pnfs_layout_process(struct nfs4_layoutget *lgp) 1582{ 1583 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; 1584 struct nfs4_layoutget_res *res = &lgp->res; 1585 struct pnfs_layout_segment *lseg; 1586 struct inode *ino = lo->plh_inode; 1587 LIST_HEAD(free_me); 1588 int status = 0; 1589 1590 /* Inject layout blob into I/O device driver */ 1591 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); 1592 if (!lseg || IS_ERR(lseg)) { 1593 if (!lseg) 1594 status = -ENOMEM; 1595 else 1596 status = PTR_ERR(lseg); 1597 dprintk("%s: Could not allocate layout: error %d\n", 1598 __func__, status); 1599 goto out; 1600 } 1601 1602 init_lseg(lo, lseg); 1603 lseg->pls_range = res->range; 1604 1605 spin_lock(&ino->i_lock); 1606 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1607 dprintk("%s forget reply due to recall\n", __func__); 1608 goto out_forget_reply; 1609 } 1610 1611 if (pnfs_layoutgets_blocked(lo, &lgp->args.range, 1)) { 1612 dprintk("%s forget reply due to state\n", __func__); 1613 goto out_forget_reply; 1614 } 1615 1616 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { 1617 /* existing state ID, make sure the sequence number matches. */ 1618 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { 1619 dprintk("%s forget reply due to sequence\n", __func__); 1620 goto out_forget_reply; 1621 } 1622 pnfs_set_layout_stateid(lo, &res->stateid, false); 1623 } else { 1624 /* 1625 * We got an entirely new state ID. Mark all segments for the 1626 * inode invalid, and don't bother validating the stateid 1627 * sequence number. 1628 */ 1629 pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL); 1630 1631 nfs4_stateid_copy(&lo->plh_stateid, &res->stateid); 1632 lo->plh_barrier = be32_to_cpu(res->stateid.seqid); 1633 } 1634 1635 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 1636 1637 pnfs_get_lseg(lseg); 1638 pnfs_layout_insert_lseg(lo, lseg); 1639 1640 if (res->return_on_close) { 1641 set_bit(NFS_LSEG_ROC, &lseg->pls_flags); 1642 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags); 1643 } 1644 1645 spin_unlock(&ino->i_lock); 1646 pnfs_free_lseg_list(&free_me); 1647 return lseg; 1648out: 1649 return ERR_PTR(status); 1650 1651out_forget_reply: 1652 spin_unlock(&ino->i_lock); 1653 lseg->pls_layout = lo; 1654 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 1655 goto out; 1656} 1657 1658static void 1659pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 1660 struct list_head *tmp_list, 1661 struct pnfs_layout_range *return_range) 1662{ 1663 struct pnfs_layout_segment *lseg, *next; 1664 1665 dprintk("%s:Begin lo %p\n", __func__, lo); 1666 1667 if (list_empty(&lo->plh_segs)) 1668 return; 1669 1670 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 1671 if (should_free_lseg(&lseg->pls_range, return_range)) { 1672 dprintk("%s: marking lseg %p iomode %d " 1673 "offset %llu length %llu\n", __func__, 1674 lseg, lseg->pls_range.iomode, 1675 lseg->pls_range.offset, 1676 lseg->pls_range.length); 1677 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 1678 mark_lseg_invalid(lseg, tmp_list); 1679 } 1680} 1681 1682void pnfs_error_mark_layout_for_return(struct inode *inode, 1683 struct pnfs_layout_segment *lseg) 1684{ 1685 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; 1686 int iomode = pnfs_iomode_to_fail_bit(lseg->pls_range.iomode); 1687 struct pnfs_layout_range range = { 1688 .iomode = lseg->pls_range.iomode, 1689 .offset = 0, 1690 .length = NFS4_MAX_UINT64, 1691 }; 1692 LIST_HEAD(free_me); 1693 1694 spin_lock(&inode->i_lock); 1695 /* set failure bit so that pnfs path will be retried later */ 1696 pnfs_layout_set_fail_bit(lo, iomode); 1697 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 1698 if (lo->plh_return_iomode == 0) 1699 lo->plh_return_iomode = range.iomode; 1700 else if (lo->plh_return_iomode != range.iomode) 1701 lo->plh_return_iomode = IOMODE_ANY; 1702 /* 1703 * mark all matching lsegs so that we are sure to have no live 1704 * segments at hand when sending layoutreturn. See pnfs_put_lseg() 1705 * for how it works. 1706 */ 1707 pnfs_mark_matching_lsegs_return(lo, &free_me, &range); 1708 spin_unlock(&inode->i_lock); 1709 pnfs_free_lseg_list(&free_me); 1710} 1711EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); 1712 1713void 1714pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 1715{ 1716 u64 rd_size = req->wb_bytes; 1717 1718 if (pgio->pg_lseg == NULL) { 1719 if (pgio->pg_dreq == NULL) 1720 rd_size = i_size_read(pgio->pg_inode) - req_offset(req); 1721 else 1722 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq); 1723 1724 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 1725 req->wb_context, 1726 req_offset(req), 1727 rd_size, 1728 IOMODE_READ, 1729 GFP_KERNEL); 1730 } 1731 /* If no lseg, fall back to read through mds */ 1732 if (pgio->pg_lseg == NULL) 1733 nfs_pageio_reset_read_mds(pgio); 1734 1735} 1736EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); 1737 1738void 1739pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 1740 struct nfs_page *req, u64 wb_size) 1741{ 1742 if (pgio->pg_lseg == NULL) 1743 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 1744 req->wb_context, 1745 req_offset(req), 1746 wb_size, 1747 IOMODE_RW, 1748 GFP_NOFS); 1749 /* If no lseg, fall back to write through mds */ 1750 if (pgio->pg_lseg == NULL) 1751 nfs_pageio_reset_write_mds(pgio); 1752} 1753EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); 1754 1755void 1756pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) 1757{ 1758 if (desc->pg_lseg) { 1759 pnfs_put_lseg(desc->pg_lseg); 1760 desc->pg_lseg = NULL; 1761 } 1762} 1763EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); 1764 1765/* 1766 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 1767 * of bytes (maximum @req->wb_bytes) that can be coalesced. 1768 */ 1769size_t 1770pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 1771 struct nfs_page *prev, struct nfs_page *req) 1772{ 1773 unsigned int size; 1774 u64 seg_end, req_start, seg_left; 1775 1776 size = nfs_generic_pg_test(pgio, prev, req); 1777 if (!size) 1778 return 0; 1779 1780 /* 1781 * 'size' contains the number of bytes left in the current page (up 1782 * to the original size asked for in @req->wb_bytes). 1783 * 1784 * Calculate how many bytes are left in the layout segment 1785 * and if there are less bytes than 'size', return that instead. 1786 * 1787 * Please also note that 'end_offset' is actually the offset of the 1788 * first byte that lies outside the pnfs_layout_range. FIXME? 1789 * 1790 */ 1791 if (pgio->pg_lseg) { 1792 seg_end = end_offset(pgio->pg_lseg->pls_range.offset, 1793 pgio->pg_lseg->pls_range.length); 1794 req_start = req_offset(req); 1795 WARN_ON_ONCE(req_start >= seg_end); 1796 /* start of request is past the last byte of this segment */ 1797 if (req_start >= seg_end) { 1798 /* reference the new lseg */ 1799 if (pgio->pg_ops->pg_cleanup) 1800 pgio->pg_ops->pg_cleanup(pgio); 1801 if (pgio->pg_ops->pg_init) 1802 pgio->pg_ops->pg_init(pgio, req); 1803 return 0; 1804 } 1805 1806 /* adjust 'size' iff there are fewer bytes left in the 1807 * segment than what nfs_generic_pg_test returned */ 1808 seg_left = seg_end - req_start; 1809 if (seg_left < size) 1810 size = (unsigned int)seg_left; 1811 } 1812 1813 return size; 1814} 1815EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); 1816 1817int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) 1818{ 1819 struct nfs_pageio_descriptor pgio; 1820 1821 /* Resend all requests through the MDS */ 1822 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, 1823 hdr->completion_ops); 1824 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags); 1825 return nfs_pageio_resend(&pgio, hdr); 1826} 1827EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); 1828 1829static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) 1830{ 1831 1832 dprintk("pnfs write error = %d\n", hdr->pnfs_error); 1833 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 1834 PNFS_LAYOUTRET_ON_ERROR) { 1835 pnfs_return_layout(hdr->inode); 1836 } 1837 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 1838 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); 1839} 1840 1841/* 1842 * Called by non rpc-based layout drivers 1843 */ 1844void pnfs_ld_write_done(struct nfs_pgio_header *hdr) 1845{ 1846 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); 1847 if (!hdr->pnfs_error) { 1848 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, 1849 hdr->mds_offset + hdr->res.count); 1850 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 1851 } else 1852 pnfs_ld_handle_write_error(hdr); 1853 hdr->mds_ops->rpc_release(hdr); 1854} 1855EXPORT_SYMBOL_GPL(pnfs_ld_write_done); 1856 1857static void 1858pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, 1859 struct nfs_pgio_header *hdr) 1860{ 1861 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 1862 1863 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1864 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 1865 nfs_pageio_reset_write_mds(desc); 1866 mirror->pg_recoalesce = 1; 1867 } 1868 nfs_pgio_data_destroy(hdr); 1869 hdr->release(hdr); 1870} 1871 1872static enum pnfs_try_status 1873pnfs_try_to_write_data(struct nfs_pgio_header *hdr, 1874 const struct rpc_call_ops *call_ops, 1875 struct pnfs_layout_segment *lseg, 1876 int how) 1877{ 1878 struct inode *inode = hdr->inode; 1879 enum pnfs_try_status trypnfs; 1880 struct nfs_server *nfss = NFS_SERVER(inode); 1881 1882 hdr->mds_ops = call_ops; 1883 1884 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, 1885 inode->i_ino, hdr->args.count, hdr->args.offset, how); 1886 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); 1887 if (trypnfs != PNFS_NOT_ATTEMPTED) 1888 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); 1889 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 1890 return trypnfs; 1891} 1892 1893static void 1894pnfs_do_write(struct nfs_pageio_descriptor *desc, 1895 struct nfs_pgio_header *hdr, int how) 1896{ 1897 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 1898 struct pnfs_layout_segment *lseg = desc->pg_lseg; 1899 enum pnfs_try_status trypnfs; 1900 1901 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); 1902 if (trypnfs == PNFS_NOT_ATTEMPTED) 1903 pnfs_write_through_mds(desc, hdr); 1904} 1905 1906static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) 1907{ 1908 pnfs_put_lseg(hdr->lseg); 1909 nfs_pgio_header_free(hdr); 1910} 1911 1912int 1913pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 1914{ 1915 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 1916 1917 struct nfs_pgio_header *hdr; 1918 int ret; 1919 1920 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 1921 if (!hdr) { 1922 desc->pg_completion_ops->error_cleanup(&mirror->pg_list); 1923 return -ENOMEM; 1924 } 1925 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); 1926 1927 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 1928 ret = nfs_generic_pgio(desc, hdr); 1929 if (!ret) 1930 pnfs_do_write(desc, hdr, desc->pg_ioflags); 1931 1932 return ret; 1933} 1934EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); 1935 1936int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) 1937{ 1938 struct nfs_pageio_descriptor pgio; 1939 1940 /* Resend all requests through the MDS */ 1941 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); 1942 return nfs_pageio_resend(&pgio, hdr); 1943} 1944EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); 1945 1946static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) 1947{ 1948 dprintk("pnfs read error = %d\n", hdr->pnfs_error); 1949 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 1950 PNFS_LAYOUTRET_ON_ERROR) { 1951 pnfs_return_layout(hdr->inode); 1952 } 1953 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 1954 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); 1955} 1956 1957/* 1958 * Called by non rpc-based layout drivers 1959 */ 1960void pnfs_ld_read_done(struct nfs_pgio_header *hdr) 1961{ 1962 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); 1963 if (likely(!hdr->pnfs_error)) { 1964 __nfs4_read_done_cb(hdr); 1965 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 1966 } else 1967 pnfs_ld_handle_read_error(hdr); 1968 hdr->mds_ops->rpc_release(hdr); 1969} 1970EXPORT_SYMBOL_GPL(pnfs_ld_read_done); 1971 1972static void 1973pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, 1974 struct nfs_pgio_header *hdr) 1975{ 1976 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 1977 1978 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1979 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 1980 nfs_pageio_reset_read_mds(desc); 1981 mirror->pg_recoalesce = 1; 1982 } 1983 nfs_pgio_data_destroy(hdr); 1984 hdr->release(hdr); 1985} 1986 1987/* 1988 * Call the appropriate parallel I/O subsystem read function. 1989 */ 1990static enum pnfs_try_status 1991pnfs_try_to_read_data(struct nfs_pgio_header *hdr, 1992 const struct rpc_call_ops *call_ops, 1993 struct pnfs_layout_segment *lseg) 1994{ 1995 struct inode *inode = hdr->inode; 1996 struct nfs_server *nfss = NFS_SERVER(inode); 1997 enum pnfs_try_status trypnfs; 1998 1999 hdr->mds_ops = call_ops; 2000 2001 dprintk("%s: Reading ino:%lu %u@%llu\n", 2002 __func__, inode->i_ino, hdr->args.count, hdr->args.offset); 2003 2004 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); 2005 if (trypnfs != PNFS_NOT_ATTEMPTED) 2006 nfs_inc_stats(inode, NFSIOS_PNFS_READ); 2007 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2008 return trypnfs; 2009} 2010 2011/* Resend all requests through pnfs. */ 2012int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr) 2013{ 2014 struct nfs_pageio_descriptor pgio; 2015 2016 nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops); 2017 return nfs_pageio_resend(&pgio, hdr); 2018} 2019EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); 2020 2021static void 2022pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) 2023{ 2024 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2025 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2026 enum pnfs_try_status trypnfs; 2027 int err = 0; 2028 2029 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); 2030 if (trypnfs == PNFS_TRY_AGAIN) 2031 err = pnfs_read_resend_pnfs(hdr); 2032 if (trypnfs == PNFS_NOT_ATTEMPTED || err) 2033 pnfs_read_through_mds(desc, hdr); 2034} 2035 2036static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) 2037{ 2038 pnfs_put_lseg(hdr->lseg); 2039 nfs_pgio_header_free(hdr); 2040} 2041 2042int 2043pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) 2044{ 2045 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2046 2047 struct nfs_pgio_header *hdr; 2048 int ret; 2049 2050 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2051 if (!hdr) { 2052 desc->pg_completion_ops->error_cleanup(&mirror->pg_list); 2053 return -ENOMEM; 2054 } 2055 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); 2056 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 2057 ret = nfs_generic_pgio(desc, hdr); 2058 if (!ret) 2059 pnfs_do_read(desc, hdr); 2060 return ret; 2061} 2062EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); 2063 2064static void pnfs_clear_layoutcommitting(struct inode *inode) 2065{ 2066 unsigned long *bitlock = &NFS_I(inode)->flags; 2067 2068 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 2069 smp_mb__after_atomic(); 2070 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 2071} 2072 2073/* 2074 * There can be multiple RW segments. 2075 */ 2076static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 2077{ 2078 struct pnfs_layout_segment *lseg; 2079 2080 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { 2081 if (lseg->pls_range.iomode == IOMODE_RW && 2082 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 2083 list_add(&lseg->pls_lc_list, listp); 2084 } 2085} 2086 2087static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) 2088{ 2089 struct pnfs_layout_segment *lseg, *tmp; 2090 2091 /* Matched by references in pnfs_set_layoutcommit */ 2092 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { 2093 list_del_init(&lseg->pls_lc_list); 2094 pnfs_put_lseg(lseg); 2095 } 2096 2097 pnfs_clear_layoutcommitting(inode); 2098} 2099 2100void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) 2101{ 2102 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); 2103} 2104EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); 2105 2106void 2107pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, 2108 loff_t end_pos) 2109{ 2110 struct nfs_inode *nfsi = NFS_I(inode); 2111 bool mark_as_dirty = false; 2112 2113 spin_lock(&inode->i_lock); 2114 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 2115 nfsi->layout->plh_lwb = end_pos; 2116 mark_as_dirty = true; 2117 dprintk("%s: Set layoutcommit for inode %lu ", 2118 __func__, inode->i_ino); 2119 } else if (end_pos > nfsi->layout->plh_lwb) 2120 nfsi->layout->plh_lwb = end_pos; 2121 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { 2122 /* references matched in nfs4_layoutcommit_release */ 2123 pnfs_get_lseg(lseg); 2124 } 2125 spin_unlock(&inode->i_lock); 2126 dprintk("%s: lseg %p end_pos %llu\n", 2127 __func__, lseg, nfsi->layout->plh_lwb); 2128 2129 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one 2130 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ 2131 if (mark_as_dirty) 2132 mark_inode_dirty_sync(inode); 2133} 2134EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); 2135 2136void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 2137{ 2138 struct nfs_server *nfss = NFS_SERVER(data->args.inode); 2139 2140 if (nfss->pnfs_curr_ld->cleanup_layoutcommit) 2141 nfss->pnfs_curr_ld->cleanup_layoutcommit(data); 2142 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); 2143} 2144 2145/* 2146 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and 2147 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough 2148 * data to disk to allow the server to recover the data if it crashes. 2149 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag 2150 * is off, and a COMMIT is sent to a data server, or 2151 * if WRITEs to a data server return NFS_DATA_SYNC. 2152 */ 2153int 2154pnfs_layoutcommit_inode(struct inode *inode, bool sync) 2155{ 2156 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 2157 struct nfs4_layoutcommit_data *data; 2158 struct nfs_inode *nfsi = NFS_I(inode); 2159 loff_t end_pos; 2160 int status; 2161 2162 if (!pnfs_layoutcommit_outstanding(inode)) 2163 return 0; 2164 2165 dprintk("--> %s inode %lu\n", __func__, inode->i_ino); 2166 2167 status = -EAGAIN; 2168 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { 2169 if (!sync) 2170 goto out; 2171 status = wait_on_bit_lock_action(&nfsi->flags, 2172 NFS_INO_LAYOUTCOMMITTING, 2173 nfs_wait_bit_killable, 2174 TASK_KILLABLE); 2175 if (status) 2176 goto out; 2177 } 2178 2179 status = -ENOMEM; 2180 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ 2181 data = kzalloc(sizeof(*data), GFP_NOFS); 2182 if (!data) 2183 goto clear_layoutcommitting; 2184 2185 status = 0; 2186 spin_lock(&inode->i_lock); 2187 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 2188 goto out_unlock; 2189 2190 INIT_LIST_HEAD(&data->lseg_list); 2191 pnfs_list_write_lseg(inode, &data->lseg_list); 2192 2193 end_pos = nfsi->layout->plh_lwb; 2194 2195 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); 2196 spin_unlock(&inode->i_lock); 2197 2198 data->args.inode = inode; 2199 data->cred = get_rpccred(nfsi->layout->plh_lc_cred); 2200 nfs_fattr_init(&data->fattr); 2201 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 2202 data->res.fattr = &data->fattr; 2203 data->args.lastbytewritten = end_pos - 1; 2204 data->res.server = NFS_SERVER(inode); 2205 2206 if (ld->prepare_layoutcommit) { 2207 status = ld->prepare_layoutcommit(&data->args); 2208 if (status) { 2209 spin_lock(&inode->i_lock); 2210 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); 2211 if (end_pos > nfsi->layout->plh_lwb) 2212 nfsi->layout->plh_lwb = end_pos; 2213 spin_unlock(&inode->i_lock); 2214 put_rpccred(data->cred); 2215 goto clear_layoutcommitting; 2216 } 2217 } 2218 2219 2220 status = nfs4_proc_layoutcommit(data, sync); 2221out: 2222 if (status) 2223 mark_inode_dirty_sync(inode); 2224 dprintk("<-- %s status %d\n", __func__, status); 2225 return status; 2226out_unlock: 2227 spin_unlock(&inode->i_lock); 2228 kfree(data); 2229clear_layoutcommitting: 2230 pnfs_clear_layoutcommitting(inode); 2231 goto out; 2232} 2233EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); 2234 2235int 2236pnfs_generic_sync(struct inode *inode, bool datasync) 2237{ 2238 return pnfs_layoutcommit_inode(inode, true); 2239} 2240EXPORT_SYMBOL_GPL(pnfs_generic_sync); 2241 2242struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 2243{ 2244 struct nfs4_threshold *thp; 2245 2246 thp = kzalloc(sizeof(*thp), GFP_NOFS); 2247 if (!thp) { 2248 dprintk("%s mdsthreshold allocation failed\n", __func__); 2249 return NULL; 2250 } 2251 return thp; 2252} 2253