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