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 #include "nfs42.h" 39 40 #define NFSDBG_FACILITY NFSDBG_PNFS 41 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ) 42 43 /* Locking: 44 * 45 * pnfs_spinlock: 46 * protects pnfs_modules_tbl. 47 */ 48 static DEFINE_SPINLOCK(pnfs_spinlock); 49 50 /* 51 * pnfs_modules_tbl holds all pnfs modules 52 */ 53 static LIST_HEAD(pnfs_modules_tbl); 54 55 static int 56 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid, 57 enum pnfs_iomode iomode, bool sync); 58 59 /* Return the registered pnfs layout driver module matching given id */ 60 static struct pnfs_layoutdriver_type * 61 find_pnfs_driver_locked(u32 id) 62 { 63 struct pnfs_layoutdriver_type *local; 64 65 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid) 66 if (local->id == id) 67 goto out; 68 local = NULL; 69 out: 70 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); 71 return local; 72 } 73 74 static struct pnfs_layoutdriver_type * 75 find_pnfs_driver(u32 id) 76 { 77 struct pnfs_layoutdriver_type *local; 78 79 spin_lock(&pnfs_spinlock); 80 local = find_pnfs_driver_locked(id); 81 if (local != NULL && !try_module_get(local->owner)) { 82 dprintk("%s: Could not grab reference on module\n", __func__); 83 local = NULL; 84 } 85 spin_unlock(&pnfs_spinlock); 86 return local; 87 } 88 89 void 90 unset_pnfs_layoutdriver(struct nfs_server *nfss) 91 { 92 if (nfss->pnfs_curr_ld) { 93 if (nfss->pnfs_curr_ld->clear_layoutdriver) 94 nfss->pnfs_curr_ld->clear_layoutdriver(nfss); 95 /* Decrement the MDS count. Purge the deviceid cache if zero */ 96 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count)) 97 nfs4_deviceid_purge_client(nfss->nfs_client); 98 module_put(nfss->pnfs_curr_ld->owner); 99 } 100 nfss->pnfs_curr_ld = NULL; 101 } 102 103 /* 104 * Try to set the server's pnfs module to the pnfs layout type specified by id. 105 * Currently only one pNFS layout driver per filesystem is supported. 106 * 107 * @id layout type. Zero (illegal layout type) indicates pNFS not in use. 108 */ 109 void 110 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, 111 u32 id) 112 { 113 struct pnfs_layoutdriver_type *ld_type = NULL; 114 115 if (id == 0) 116 goto out_no_driver; 117 if (!(server->nfs_client->cl_exchange_flags & 118 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { 119 printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n", 120 __func__, id, server->nfs_client->cl_exchange_flags); 121 goto out_no_driver; 122 } 123 ld_type = find_pnfs_driver(id); 124 if (!ld_type) { 125 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); 126 ld_type = find_pnfs_driver(id); 127 if (!ld_type) { 128 dprintk("%s: No pNFS module found for %u.\n", 129 __func__, id); 130 goto out_no_driver; 131 } 132 } 133 server->pnfs_curr_ld = ld_type; 134 if (ld_type->set_layoutdriver 135 && ld_type->set_layoutdriver(server, mntfh)) { 136 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout " 137 "driver %u.\n", __func__, id); 138 module_put(ld_type->owner); 139 goto out_no_driver; 140 } 141 /* Bump the MDS count */ 142 atomic_inc(&server->nfs_client->cl_mds_count); 143 144 dprintk("%s: pNFS module for %u set\n", __func__, id); 145 return; 146 147 out_no_driver: 148 dprintk("%s: Using NFSv4 I/O\n", __func__); 149 server->pnfs_curr_ld = NULL; 150 } 151 152 int 153 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 154 { 155 int status = -EINVAL; 156 struct pnfs_layoutdriver_type *tmp; 157 158 if (ld_type->id == 0) { 159 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__); 160 return status; 161 } 162 if (!ld_type->alloc_lseg || !ld_type->free_lseg) { 163 printk(KERN_ERR "NFS: %s Layout driver must provide " 164 "alloc_lseg and free_lseg.\n", __func__); 165 return status; 166 } 167 168 spin_lock(&pnfs_spinlock); 169 tmp = find_pnfs_driver_locked(ld_type->id); 170 if (!tmp) { 171 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); 172 status = 0; 173 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, 174 ld_type->name); 175 } else { 176 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n", 177 __func__, ld_type->id); 178 } 179 spin_unlock(&pnfs_spinlock); 180 181 return status; 182 } 183 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); 184 185 void 186 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 187 { 188 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); 189 spin_lock(&pnfs_spinlock); 190 list_del(&ld_type->pnfs_tblid); 191 spin_unlock(&pnfs_spinlock); 192 } 193 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); 194 195 /* 196 * pNFS client layout cache 197 */ 198 199 /* Need to hold i_lock if caller does not already hold reference */ 200 void 201 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo) 202 { 203 atomic_inc(&lo->plh_refcount); 204 } 205 206 static struct pnfs_layout_hdr * 207 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) 208 { 209 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 210 return ld->alloc_layout_hdr(ino, gfp_flags); 211 } 212 213 static void 214 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) 215 { 216 struct nfs_server *server = NFS_SERVER(lo->plh_inode); 217 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; 218 219 if (!list_empty(&lo->plh_layouts)) { 220 struct nfs_client *clp = server->nfs_client; 221 222 spin_lock(&clp->cl_lock); 223 list_del_init(&lo->plh_layouts); 224 spin_unlock(&clp->cl_lock); 225 } 226 put_rpccred(lo->plh_lc_cred); 227 return ld->free_layout_hdr(lo); 228 } 229 230 static void 231 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) 232 { 233 struct nfs_inode *nfsi = NFS_I(lo->plh_inode); 234 dprintk("%s: freeing layout cache %p\n", __func__, lo); 235 nfsi->layout = NULL; 236 /* Reset MDS Threshold I/O counters */ 237 nfsi->write_io = 0; 238 nfsi->read_io = 0; 239 } 240 241 void 242 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) 243 { 244 struct inode *inode = lo->plh_inode; 245 246 if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { 247 if (!list_empty(&lo->plh_segs)) 248 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n"); 249 pnfs_detach_layout_hdr(lo); 250 spin_unlock(&inode->i_lock); 251 pnfs_free_layout_hdr(lo); 252 } 253 } 254 255 static int 256 pnfs_iomode_to_fail_bit(u32 iomode) 257 { 258 return iomode == IOMODE_RW ? 259 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; 260 } 261 262 static void 263 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 264 { 265 lo->plh_retry_timestamp = jiffies; 266 if (!test_and_set_bit(fail_bit, &lo->plh_flags)) 267 atomic_inc(&lo->plh_refcount); 268 } 269 270 static void 271 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 272 { 273 if (test_and_clear_bit(fail_bit, &lo->plh_flags)) 274 atomic_dec(&lo->plh_refcount); 275 } 276 277 static void 278 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) 279 { 280 struct inode *inode = lo->plh_inode; 281 struct pnfs_layout_range range = { 282 .iomode = iomode, 283 .offset = 0, 284 .length = NFS4_MAX_UINT64, 285 }; 286 LIST_HEAD(head); 287 288 spin_lock(&inode->i_lock); 289 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 290 pnfs_mark_matching_lsegs_invalid(lo, &head, &range); 291 spin_unlock(&inode->i_lock); 292 pnfs_free_lseg_list(&head); 293 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, 294 iomode == IOMODE_RW ? "RW" : "READ"); 295 } 296 297 static bool 298 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) 299 { 300 unsigned long start, end; 301 int fail_bit = pnfs_iomode_to_fail_bit(iomode); 302 303 if (test_bit(fail_bit, &lo->plh_flags) == 0) 304 return false; 305 end = jiffies; 306 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; 307 if (!time_in_range(lo->plh_retry_timestamp, start, end)) { 308 /* It is time to retry the failed layoutgets */ 309 pnfs_layout_clear_fail_bit(lo, fail_bit); 310 return false; 311 } 312 return true; 313 } 314 315 static void 316 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg) 317 { 318 INIT_LIST_HEAD(&lseg->pls_list); 319 INIT_LIST_HEAD(&lseg->pls_lc_list); 320 atomic_set(&lseg->pls_refcount, 1); 321 smp_mb(); 322 set_bit(NFS_LSEG_VALID, &lseg->pls_flags); 323 lseg->pls_layout = lo; 324 } 325 326 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) 327 { 328 struct inode *ino = lseg->pls_layout->plh_inode; 329 330 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 331 } 332 333 static void 334 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, 335 struct pnfs_layout_segment *lseg) 336 { 337 struct inode *inode = lo->plh_inode; 338 339 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 340 list_del_init(&lseg->pls_list); 341 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ 342 atomic_dec(&lo->plh_refcount); 343 if (list_empty(&lo->plh_segs)) 344 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 345 rpc_wake_up(&NFS_SERVER(inode)->roc_rpcwaitq); 346 } 347 348 /* Return true if layoutreturn is needed */ 349 static bool 350 pnfs_layout_need_return(struct pnfs_layout_hdr *lo, 351 struct pnfs_layout_segment *lseg) 352 { 353 struct pnfs_layout_segment *s; 354 355 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 356 return false; 357 358 list_for_each_entry(s, &lo->plh_segs, pls_list) 359 if (s != lseg && test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags)) 360 return false; 361 362 return true; 363 } 364 365 static void pnfs_layoutreturn_before_put_lseg(struct pnfs_layout_segment *lseg, 366 struct pnfs_layout_hdr *lo, struct inode *inode) 367 { 368 lo = lseg->pls_layout; 369 inode = lo->plh_inode; 370 371 spin_lock(&inode->i_lock); 372 if (pnfs_layout_need_return(lo, lseg)) { 373 nfs4_stateid stateid; 374 enum pnfs_iomode iomode; 375 376 stateid = lo->plh_stateid; 377 iomode = lo->plh_return_iomode; 378 /* decreased in pnfs_send_layoutreturn() */ 379 lo->plh_block_lgets++; 380 lo->plh_return_iomode = 0; 381 spin_unlock(&inode->i_lock); 382 pnfs_get_layout_hdr(lo); 383 384 /* Send an async layoutreturn so we dont deadlock */ 385 pnfs_send_layoutreturn(lo, stateid, iomode, false); 386 } else 387 spin_unlock(&inode->i_lock); 388 } 389 390 void 391 pnfs_put_lseg(struct pnfs_layout_segment *lseg) 392 { 393 struct pnfs_layout_hdr *lo; 394 struct inode *inode; 395 396 if (!lseg) 397 return; 398 399 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, 400 atomic_read(&lseg->pls_refcount), 401 test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 402 403 /* Handle the case where refcount != 1 */ 404 if (atomic_add_unless(&lseg->pls_refcount, -1, 1)) 405 return; 406 407 lo = lseg->pls_layout; 408 inode = lo->plh_inode; 409 /* Do we need a layoutreturn? */ 410 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 411 pnfs_layoutreturn_before_put_lseg(lseg, lo, inode); 412 413 if (atomic_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { 414 pnfs_get_layout_hdr(lo); 415 pnfs_layout_remove_lseg(lo, lseg); 416 spin_unlock(&inode->i_lock); 417 pnfs_free_lseg(lseg); 418 pnfs_put_layout_hdr(lo); 419 } 420 } 421 EXPORT_SYMBOL_GPL(pnfs_put_lseg); 422 423 static void pnfs_free_lseg_async_work(struct work_struct *work) 424 { 425 struct pnfs_layout_segment *lseg; 426 struct pnfs_layout_hdr *lo; 427 428 lseg = container_of(work, struct pnfs_layout_segment, pls_work); 429 lo = lseg->pls_layout; 430 431 pnfs_free_lseg(lseg); 432 pnfs_put_layout_hdr(lo); 433 } 434 435 static void pnfs_free_lseg_async(struct pnfs_layout_segment *lseg) 436 { 437 INIT_WORK(&lseg->pls_work, pnfs_free_lseg_async_work); 438 schedule_work(&lseg->pls_work); 439 } 440 441 void 442 pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg) 443 { 444 if (!lseg) 445 return; 446 447 assert_spin_locked(&lseg->pls_layout->plh_inode->i_lock); 448 449 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, 450 atomic_read(&lseg->pls_refcount), 451 test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 452 if (atomic_dec_and_test(&lseg->pls_refcount)) { 453 struct pnfs_layout_hdr *lo = lseg->pls_layout; 454 pnfs_get_layout_hdr(lo); 455 pnfs_layout_remove_lseg(lo, lseg); 456 pnfs_free_lseg_async(lseg); 457 } 458 } 459 EXPORT_SYMBOL_GPL(pnfs_put_lseg_locked); 460 461 static u64 462 end_offset(u64 start, u64 len) 463 { 464 u64 end; 465 466 end = start + len; 467 return end >= start ? end : NFS4_MAX_UINT64; 468 } 469 470 /* 471 * is l2 fully contained in l1? 472 * start1 end1 473 * [----------------------------------) 474 * start2 end2 475 * [----------------) 476 */ 477 static bool 478 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, 479 const struct pnfs_layout_range *l2) 480 { 481 u64 start1 = l1->offset; 482 u64 end1 = end_offset(start1, l1->length); 483 u64 start2 = l2->offset; 484 u64 end2 = end_offset(start2, l2->length); 485 486 return (start1 <= start2) && (end1 >= end2); 487 } 488 489 /* 490 * is l1 and l2 intersecting? 491 * start1 end1 492 * [----------------------------------) 493 * start2 end2 494 * [----------------) 495 */ 496 static bool 497 pnfs_lseg_range_intersecting(const struct pnfs_layout_range *l1, 498 const struct pnfs_layout_range *l2) 499 { 500 u64 start1 = l1->offset; 501 u64 end1 = end_offset(start1, l1->length); 502 u64 start2 = l2->offset; 503 u64 end2 = end_offset(start2, l2->length); 504 505 return (end1 == NFS4_MAX_UINT64 || end1 > start2) && 506 (end2 == NFS4_MAX_UINT64 || end2 > start1); 507 } 508 509 static bool 510 should_free_lseg(const struct pnfs_layout_range *lseg_range, 511 const struct pnfs_layout_range *recall_range) 512 { 513 return (recall_range->iomode == IOMODE_ANY || 514 lseg_range->iomode == recall_range->iomode) && 515 pnfs_lseg_range_intersecting(lseg_range, recall_range); 516 } 517 518 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, 519 struct list_head *tmp_list) 520 { 521 if (!atomic_dec_and_test(&lseg->pls_refcount)) 522 return false; 523 pnfs_layout_remove_lseg(lseg->pls_layout, lseg); 524 list_add(&lseg->pls_list, tmp_list); 525 return true; 526 } 527 528 /* Returns 1 if lseg is removed from list, 0 otherwise */ 529 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, 530 struct list_head *tmp_list) 531 { 532 int rv = 0; 533 534 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 535 /* Remove the reference keeping the lseg in the 536 * list. It will now be removed when all 537 * outstanding io is finished. 538 */ 539 dprintk("%s: lseg %p ref %d\n", __func__, lseg, 540 atomic_read(&lseg->pls_refcount)); 541 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) 542 rv = 1; 543 } 544 return rv; 545 } 546 547 /* Returns count of number of matching invalid lsegs remaining in list 548 * after call. 549 */ 550 int 551 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 552 struct list_head *tmp_list, 553 struct pnfs_layout_range *recall_range) 554 { 555 struct pnfs_layout_segment *lseg, *next; 556 int invalid = 0, removed = 0; 557 558 dprintk("%s:Begin lo %p\n", __func__, lo); 559 560 if (list_empty(&lo->plh_segs)) 561 return 0; 562 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 563 if (!recall_range || 564 should_free_lseg(&lseg->pls_range, recall_range)) { 565 dprintk("%s: freeing lseg %p iomode %d " 566 "offset %llu length %llu\n", __func__, 567 lseg, lseg->pls_range.iomode, lseg->pls_range.offset, 568 lseg->pls_range.length); 569 invalid++; 570 removed += mark_lseg_invalid(lseg, tmp_list); 571 } 572 dprintk("%s:Return %i\n", __func__, invalid - removed); 573 return invalid - removed; 574 } 575 576 /* note free_me must contain lsegs from a single layout_hdr */ 577 void 578 pnfs_free_lseg_list(struct list_head *free_me) 579 { 580 struct pnfs_layout_segment *lseg, *tmp; 581 582 if (list_empty(free_me)) 583 return; 584 585 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { 586 list_del(&lseg->pls_list); 587 pnfs_free_lseg(lseg); 588 } 589 } 590 591 void 592 pnfs_destroy_layout(struct nfs_inode *nfsi) 593 { 594 struct pnfs_layout_hdr *lo; 595 LIST_HEAD(tmp_list); 596 597 spin_lock(&nfsi->vfs_inode.i_lock); 598 lo = nfsi->layout; 599 if (lo) { 600 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */ 601 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL); 602 pnfs_get_layout_hdr(lo); 603 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); 604 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); 605 pnfs_clear_retry_layoutget(lo); 606 spin_unlock(&nfsi->vfs_inode.i_lock); 607 pnfs_free_lseg_list(&tmp_list); 608 pnfs_put_layout_hdr(lo); 609 } else 610 spin_unlock(&nfsi->vfs_inode.i_lock); 611 } 612 EXPORT_SYMBOL_GPL(pnfs_destroy_layout); 613 614 static bool 615 pnfs_layout_add_bulk_destroy_list(struct inode *inode, 616 struct list_head *layout_list) 617 { 618 struct pnfs_layout_hdr *lo; 619 bool ret = false; 620 621 spin_lock(&inode->i_lock); 622 lo = NFS_I(inode)->layout; 623 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) { 624 pnfs_get_layout_hdr(lo); 625 list_add(&lo->plh_bulk_destroy, layout_list); 626 ret = true; 627 } 628 spin_unlock(&inode->i_lock); 629 return ret; 630 } 631 632 /* Caller must hold rcu_read_lock and clp->cl_lock */ 633 static int 634 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp, 635 struct nfs_server *server, 636 struct list_head *layout_list) 637 { 638 struct pnfs_layout_hdr *lo, *next; 639 struct inode *inode; 640 641 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) { 642 inode = igrab(lo->plh_inode); 643 if (inode == NULL) 644 continue; 645 list_del_init(&lo->plh_layouts); 646 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list)) 647 continue; 648 rcu_read_unlock(); 649 spin_unlock(&clp->cl_lock); 650 iput(inode); 651 spin_lock(&clp->cl_lock); 652 rcu_read_lock(); 653 return -EAGAIN; 654 } 655 return 0; 656 } 657 658 static int 659 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, 660 bool is_bulk_recall) 661 { 662 struct pnfs_layout_hdr *lo; 663 struct inode *inode; 664 struct pnfs_layout_range range = { 665 .iomode = IOMODE_ANY, 666 .offset = 0, 667 .length = NFS4_MAX_UINT64, 668 }; 669 LIST_HEAD(lseg_list); 670 int ret = 0; 671 672 while (!list_empty(layout_list)) { 673 lo = list_entry(layout_list->next, struct pnfs_layout_hdr, 674 plh_bulk_destroy); 675 dprintk("%s freeing layout for inode %lu\n", __func__, 676 lo->plh_inode->i_ino); 677 inode = lo->plh_inode; 678 679 pnfs_layoutcommit_inode(inode, false); 680 681 spin_lock(&inode->i_lock); 682 list_del_init(&lo->plh_bulk_destroy); 683 lo->plh_block_lgets++; /* permanently block new LAYOUTGETs */ 684 if (is_bulk_recall) 685 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 686 if (pnfs_mark_matching_lsegs_invalid(lo, &lseg_list, &range)) 687 ret = -EAGAIN; 688 spin_unlock(&inode->i_lock); 689 pnfs_free_lseg_list(&lseg_list); 690 pnfs_put_layout_hdr(lo); 691 iput(inode); 692 } 693 return ret; 694 } 695 696 int 697 pnfs_destroy_layouts_byfsid(struct nfs_client *clp, 698 struct nfs_fsid *fsid, 699 bool is_recall) 700 { 701 struct nfs_server *server; 702 LIST_HEAD(layout_list); 703 704 spin_lock(&clp->cl_lock); 705 rcu_read_lock(); 706 restart: 707 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 708 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0) 709 continue; 710 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 711 server, 712 &layout_list) != 0) 713 goto restart; 714 } 715 rcu_read_unlock(); 716 spin_unlock(&clp->cl_lock); 717 718 if (list_empty(&layout_list)) 719 return 0; 720 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 721 } 722 723 int 724 pnfs_destroy_layouts_byclid(struct nfs_client *clp, 725 bool is_recall) 726 { 727 struct nfs_server *server; 728 LIST_HEAD(layout_list); 729 730 spin_lock(&clp->cl_lock); 731 rcu_read_lock(); 732 restart: 733 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 734 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 735 server, 736 &layout_list) != 0) 737 goto restart; 738 } 739 rcu_read_unlock(); 740 spin_unlock(&clp->cl_lock); 741 742 if (list_empty(&layout_list)) 743 return 0; 744 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 745 } 746 747 /* 748 * Called by the state manger to remove all layouts established under an 749 * expired lease. 750 */ 751 void 752 pnfs_destroy_all_layouts(struct nfs_client *clp) 753 { 754 nfs4_deviceid_mark_client_invalid(clp); 755 nfs4_deviceid_purge_client(clp); 756 757 pnfs_destroy_layouts_byclid(clp, false); 758 } 759 760 /* 761 * Compare 2 layout stateid sequence ids, to see which is newer, 762 * taking into account wraparound issues. 763 */ 764 static bool pnfs_seqid_is_newer(u32 s1, u32 s2) 765 { 766 return (s32)(s1 - s2) > 0; 767 } 768 769 /* update lo->plh_stateid with new if is more recent */ 770 void 771 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, 772 bool update_barrier) 773 { 774 u32 oldseq, newseq, new_barrier; 775 int empty = list_empty(&lo->plh_segs); 776 777 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 778 newseq = be32_to_cpu(new->seqid); 779 if (empty || pnfs_seqid_is_newer(newseq, oldseq)) { 780 nfs4_stateid_copy(&lo->plh_stateid, new); 781 if (update_barrier) { 782 new_barrier = be32_to_cpu(new->seqid); 783 } else { 784 /* Because of wraparound, we want to keep the barrier 785 * "close" to the current seqids. 786 */ 787 new_barrier = newseq - atomic_read(&lo->plh_outstanding); 788 } 789 if (empty || pnfs_seqid_is_newer(new_barrier, lo->plh_barrier)) 790 lo->plh_barrier = new_barrier; 791 } 792 } 793 794 static bool 795 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, 796 const nfs4_stateid *stateid) 797 { 798 u32 seqid = be32_to_cpu(stateid->seqid); 799 800 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier); 801 } 802 803 static bool 804 pnfs_layout_returning(const struct pnfs_layout_hdr *lo, 805 struct pnfs_layout_range *range) 806 { 807 return test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) && 808 (lo->plh_return_iomode == IOMODE_ANY || 809 lo->plh_return_iomode == range->iomode); 810 } 811 812 /* lget is set to 1 if called from inside send_layoutget call chain */ 813 static bool 814 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo, 815 struct pnfs_layout_range *range, int lget) 816 { 817 return lo->plh_block_lgets || 818 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) || 819 (list_empty(&lo->plh_segs) && 820 (atomic_read(&lo->plh_outstanding) > lget)) || 821 pnfs_layout_returning(lo, range); 822 } 823 824 int 825 pnfs_choose_layoutget_stateid(nfs4_stateid *dst, struct pnfs_layout_hdr *lo, 826 struct pnfs_layout_range *range, 827 struct nfs4_state *open_state) 828 { 829 int status = 0; 830 831 dprintk("--> %s\n", __func__); 832 spin_lock(&lo->plh_inode->i_lock); 833 if (pnfs_layoutgets_blocked(lo, range, 1)) { 834 status = -EAGAIN; 835 } else if (!nfs4_valid_open_stateid(open_state)) { 836 status = -EBADF; 837 } else if (list_empty(&lo->plh_segs) || 838 test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { 839 int seq; 840 841 do { 842 seq = read_seqbegin(&open_state->seqlock); 843 nfs4_stateid_copy(dst, &open_state->stateid); 844 } while (read_seqretry(&open_state->seqlock, seq)); 845 } else 846 nfs4_stateid_copy(dst, &lo->plh_stateid); 847 spin_unlock(&lo->plh_inode->i_lock); 848 dprintk("<-- %s\n", __func__); 849 return status; 850 } 851 852 /* 853 * Get layout from server. 854 * for now, assume that whole file layouts are requested. 855 * arg->offset: 0 856 * arg->length: all ones 857 */ 858 static struct pnfs_layout_segment * 859 send_layoutget(struct pnfs_layout_hdr *lo, 860 struct nfs_open_context *ctx, 861 struct pnfs_layout_range *range, 862 gfp_t gfp_flags) 863 { 864 struct inode *ino = lo->plh_inode; 865 struct nfs_server *server = NFS_SERVER(ino); 866 struct nfs4_layoutget *lgp; 867 struct pnfs_layout_segment *lseg; 868 869 dprintk("--> %s\n", __func__); 870 871 lgp = kzalloc(sizeof(*lgp), gfp_flags); 872 if (lgp == NULL) 873 return NULL; 874 875 lgp->args.minlength = PAGE_CACHE_SIZE; 876 if (lgp->args.minlength > range->length) 877 lgp->args.minlength = range->length; 878 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; 879 lgp->args.range = *range; 880 lgp->args.type = server->pnfs_curr_ld->id; 881 lgp->args.inode = ino; 882 lgp->args.ctx = get_nfs_open_context(ctx); 883 lgp->gfp_flags = gfp_flags; 884 lgp->cred = lo->plh_lc_cred; 885 886 /* Synchronously retrieve layout information from server and 887 * store in lseg. 888 */ 889 lseg = nfs4_proc_layoutget(lgp, gfp_flags); 890 if (IS_ERR(lseg)) { 891 switch (PTR_ERR(lseg)) { 892 case -ENOMEM: 893 case -ERESTARTSYS: 894 break; 895 default: 896 /* remember that LAYOUTGET failed and suspend trying */ 897 pnfs_layout_io_set_failed(lo, range->iomode); 898 } 899 return NULL; 900 } else 901 pnfs_layout_clear_fail_bit(lo, 902 pnfs_iomode_to_fail_bit(range->iomode)); 903 904 return lseg; 905 } 906 907 static void pnfs_clear_layoutcommit(struct inode *inode, 908 struct list_head *head) 909 { 910 struct nfs_inode *nfsi = NFS_I(inode); 911 struct pnfs_layout_segment *lseg, *tmp; 912 913 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 914 return; 915 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { 916 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 917 continue; 918 pnfs_lseg_dec_and_remove_zero(lseg, head); 919 } 920 } 921 922 void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) 923 { 924 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); 925 smp_mb__after_atomic(); 926 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); 927 } 928 929 static int 930 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, nfs4_stateid stateid, 931 enum pnfs_iomode iomode, bool sync) 932 { 933 struct inode *ino = lo->plh_inode; 934 struct nfs4_layoutreturn *lrp; 935 int status = 0; 936 937 lrp = kzalloc(sizeof(*lrp), GFP_NOFS); 938 if (unlikely(lrp == NULL)) { 939 status = -ENOMEM; 940 spin_lock(&ino->i_lock); 941 lo->plh_block_lgets--; 942 pnfs_clear_layoutreturn_waitbit(lo); 943 rpc_wake_up(&NFS_SERVER(ino)->roc_rpcwaitq); 944 spin_unlock(&ino->i_lock); 945 pnfs_put_layout_hdr(lo); 946 goto out; 947 } 948 949 lrp->args.stateid = stateid; 950 lrp->args.layout_type = NFS_SERVER(ino)->pnfs_curr_ld->id; 951 lrp->args.inode = ino; 952 lrp->args.range.iomode = iomode; 953 lrp->args.range.offset = 0; 954 lrp->args.range.length = NFS4_MAX_UINT64; 955 lrp->args.layout = lo; 956 lrp->clp = NFS_SERVER(ino)->nfs_client; 957 lrp->cred = lo->plh_lc_cred; 958 959 status = nfs4_proc_layoutreturn(lrp, sync); 960 out: 961 dprintk("<-- %s status: %d\n", __func__, status); 962 return status; 963 } 964 965 /* 966 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr 967 * when the layout segment list is empty. 968 * 969 * Note that a pnfs_layout_hdr can exist with an empty layout segment 970 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the 971 * deviceid is marked invalid. 972 */ 973 int 974 _pnfs_return_layout(struct inode *ino) 975 { 976 struct pnfs_layout_hdr *lo = NULL; 977 struct nfs_inode *nfsi = NFS_I(ino); 978 LIST_HEAD(tmp_list); 979 nfs4_stateid stateid; 980 int status = 0, empty; 981 982 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); 983 984 spin_lock(&ino->i_lock); 985 lo = nfsi->layout; 986 if (!lo) { 987 spin_unlock(&ino->i_lock); 988 dprintk("NFS: %s no layout to return\n", __func__); 989 goto out; 990 } 991 stateid = nfsi->layout->plh_stateid; 992 /* Reference matched in nfs4_layoutreturn_release */ 993 pnfs_get_layout_hdr(lo); 994 empty = list_empty(&lo->plh_segs); 995 pnfs_clear_layoutcommit(ino, &tmp_list); 996 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL); 997 998 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 999 struct pnfs_layout_range range = { 1000 .iomode = IOMODE_ANY, 1001 .offset = 0, 1002 .length = NFS4_MAX_UINT64, 1003 }; 1004 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); 1005 } 1006 1007 /* Don't send a LAYOUTRETURN if list was initially empty */ 1008 if (empty) { 1009 spin_unlock(&ino->i_lock); 1010 pnfs_put_layout_hdr(lo); 1011 dprintk("NFS: %s no layout segments to return\n", __func__); 1012 goto out; 1013 } 1014 1015 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 1016 lo->plh_block_lgets++; 1017 spin_unlock(&ino->i_lock); 1018 pnfs_free_lseg_list(&tmp_list); 1019 1020 status = pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true); 1021 out: 1022 dprintk("<-- %s status: %d\n", __func__, status); 1023 return status; 1024 } 1025 EXPORT_SYMBOL_GPL(_pnfs_return_layout); 1026 1027 int 1028 pnfs_commit_and_return_layout(struct inode *inode) 1029 { 1030 struct pnfs_layout_hdr *lo; 1031 int ret; 1032 1033 spin_lock(&inode->i_lock); 1034 lo = NFS_I(inode)->layout; 1035 if (lo == NULL) { 1036 spin_unlock(&inode->i_lock); 1037 return 0; 1038 } 1039 pnfs_get_layout_hdr(lo); 1040 /* Block new layoutgets and read/write to ds */ 1041 lo->plh_block_lgets++; 1042 spin_unlock(&inode->i_lock); 1043 filemap_fdatawait(inode->i_mapping); 1044 ret = pnfs_layoutcommit_inode(inode, true); 1045 if (ret == 0) 1046 ret = _pnfs_return_layout(inode); 1047 spin_lock(&inode->i_lock); 1048 lo->plh_block_lgets--; 1049 spin_unlock(&inode->i_lock); 1050 pnfs_put_layout_hdr(lo); 1051 return ret; 1052 } 1053 1054 bool pnfs_roc(struct inode *ino) 1055 { 1056 struct nfs_inode *nfsi = NFS_I(ino); 1057 struct nfs_open_context *ctx; 1058 struct nfs4_state *state; 1059 struct pnfs_layout_hdr *lo; 1060 struct pnfs_layout_segment *lseg, *tmp; 1061 nfs4_stateid stateid; 1062 LIST_HEAD(tmp_list); 1063 bool found = false, layoutreturn = false; 1064 1065 spin_lock(&ino->i_lock); 1066 lo = nfsi->layout; 1067 if (!lo || !test_and_clear_bit(NFS_LAYOUT_ROC, &lo->plh_flags) || 1068 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) 1069 goto out_noroc; 1070 1071 /* Don't return layout if we hold a delegation */ 1072 if (nfs4_check_delegation(ino, FMODE_READ)) 1073 goto out_noroc; 1074 1075 list_for_each_entry(ctx, &nfsi->open_files, list) { 1076 state = ctx->state; 1077 /* Don't return layout if there is open file state */ 1078 if (state != NULL && state->state != 0) 1079 goto out_noroc; 1080 } 1081 1082 pnfs_clear_retry_layoutget(lo); 1083 list_for_each_entry_safe(lseg, tmp, &lo->plh_segs, pls_list) 1084 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { 1085 mark_lseg_invalid(lseg, &tmp_list); 1086 found = true; 1087 } 1088 if (!found) 1089 goto out_noroc; 1090 lo->plh_block_lgets++; 1091 pnfs_get_layout_hdr(lo); /* matched in pnfs_roc_release */ 1092 spin_unlock(&ino->i_lock); 1093 pnfs_free_lseg_list(&tmp_list); 1094 pnfs_layoutcommit_inode(ino, true); 1095 return true; 1096 1097 out_noroc: 1098 if (lo) { 1099 stateid = lo->plh_stateid; 1100 layoutreturn = 1101 test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, 1102 &lo->plh_flags); 1103 if (layoutreturn) { 1104 lo->plh_block_lgets++; 1105 pnfs_get_layout_hdr(lo); 1106 } 1107 } 1108 spin_unlock(&ino->i_lock); 1109 if (layoutreturn) { 1110 pnfs_layoutcommit_inode(ino, true); 1111 pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, true); 1112 } 1113 return false; 1114 } 1115 1116 void pnfs_roc_release(struct inode *ino) 1117 { 1118 struct pnfs_layout_hdr *lo; 1119 1120 spin_lock(&ino->i_lock); 1121 lo = NFS_I(ino)->layout; 1122 lo->plh_block_lgets--; 1123 if (atomic_dec_and_test(&lo->plh_refcount)) { 1124 pnfs_detach_layout_hdr(lo); 1125 spin_unlock(&ino->i_lock); 1126 pnfs_free_layout_hdr(lo); 1127 } else 1128 spin_unlock(&ino->i_lock); 1129 } 1130 1131 void pnfs_roc_set_barrier(struct inode *ino, u32 barrier) 1132 { 1133 struct pnfs_layout_hdr *lo; 1134 1135 spin_lock(&ino->i_lock); 1136 lo = NFS_I(ino)->layout; 1137 if (pnfs_seqid_is_newer(barrier, lo->plh_barrier)) 1138 lo->plh_barrier = barrier; 1139 spin_unlock(&ino->i_lock); 1140 } 1141 1142 bool pnfs_roc_drain(struct inode *ino, u32 *barrier, struct rpc_task *task) 1143 { 1144 struct nfs_inode *nfsi = NFS_I(ino); 1145 struct pnfs_layout_hdr *lo; 1146 struct pnfs_layout_segment *lseg; 1147 nfs4_stateid stateid; 1148 u32 current_seqid; 1149 bool found = false, layoutreturn = false; 1150 1151 spin_lock(&ino->i_lock); 1152 list_for_each_entry(lseg, &nfsi->layout->plh_segs, pls_list) 1153 if (test_bit(NFS_LSEG_ROC, &lseg->pls_flags)) { 1154 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1155 found = true; 1156 goto out; 1157 } 1158 lo = nfsi->layout; 1159 current_seqid = be32_to_cpu(lo->plh_stateid.seqid); 1160 1161 /* Since close does not return a layout stateid for use as 1162 * a barrier, we choose the worst-case barrier. 1163 */ 1164 *barrier = current_seqid + atomic_read(&lo->plh_outstanding); 1165 out: 1166 if (!found) { 1167 stateid = lo->plh_stateid; 1168 layoutreturn = 1169 test_and_clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, 1170 &lo->plh_flags); 1171 if (layoutreturn) { 1172 lo->plh_block_lgets++; 1173 pnfs_get_layout_hdr(lo); 1174 } 1175 } 1176 spin_unlock(&ino->i_lock); 1177 if (layoutreturn) { 1178 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1179 pnfs_send_layoutreturn(lo, stateid, IOMODE_ANY, false); 1180 } 1181 return found; 1182 } 1183 1184 /* 1185 * Compare two layout segments for sorting into layout cache. 1186 * We want to preferentially return RW over RO layouts, so ensure those 1187 * are seen first. 1188 */ 1189 static s64 1190 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, 1191 const struct pnfs_layout_range *l2) 1192 { 1193 s64 d; 1194 1195 /* high offset > low offset */ 1196 d = l1->offset - l2->offset; 1197 if (d) 1198 return d; 1199 1200 /* short length > long length */ 1201 d = l2->length - l1->length; 1202 if (d) 1203 return d; 1204 1205 /* read > read/write */ 1206 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); 1207 } 1208 1209 static void 1210 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1211 struct pnfs_layout_segment *lseg) 1212 { 1213 struct pnfs_layout_segment *lp; 1214 1215 dprintk("%s:Begin\n", __func__); 1216 1217 list_for_each_entry(lp, &lo->plh_segs, pls_list) { 1218 if (pnfs_lseg_range_cmp(&lseg->pls_range, &lp->pls_range) > 0) 1219 continue; 1220 list_add_tail(&lseg->pls_list, &lp->pls_list); 1221 dprintk("%s: inserted lseg %p " 1222 "iomode %d offset %llu length %llu before " 1223 "lp %p iomode %d offset %llu length %llu\n", 1224 __func__, lseg, lseg->pls_range.iomode, 1225 lseg->pls_range.offset, lseg->pls_range.length, 1226 lp, lp->pls_range.iomode, lp->pls_range.offset, 1227 lp->pls_range.length); 1228 goto out; 1229 } 1230 list_add_tail(&lseg->pls_list, &lo->plh_segs); 1231 dprintk("%s: inserted lseg %p " 1232 "iomode %d offset %llu length %llu at tail\n", 1233 __func__, lseg, lseg->pls_range.iomode, 1234 lseg->pls_range.offset, lseg->pls_range.length); 1235 out: 1236 pnfs_get_layout_hdr(lo); 1237 1238 dprintk("%s:Return\n", __func__); 1239 } 1240 1241 static struct pnfs_layout_hdr * 1242 alloc_init_layout_hdr(struct inode *ino, 1243 struct nfs_open_context *ctx, 1244 gfp_t gfp_flags) 1245 { 1246 struct pnfs_layout_hdr *lo; 1247 1248 lo = pnfs_alloc_layout_hdr(ino, gfp_flags); 1249 if (!lo) 1250 return NULL; 1251 atomic_set(&lo->plh_refcount, 1); 1252 INIT_LIST_HEAD(&lo->plh_layouts); 1253 INIT_LIST_HEAD(&lo->plh_segs); 1254 INIT_LIST_HEAD(&lo->plh_bulk_destroy); 1255 lo->plh_inode = ino; 1256 lo->plh_lc_cred = get_rpccred(ctx->cred); 1257 return lo; 1258 } 1259 1260 static struct pnfs_layout_hdr * 1261 pnfs_find_alloc_layout(struct inode *ino, 1262 struct nfs_open_context *ctx, 1263 gfp_t gfp_flags) 1264 { 1265 struct nfs_inode *nfsi = NFS_I(ino); 1266 struct pnfs_layout_hdr *new = NULL; 1267 1268 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); 1269 1270 if (nfsi->layout != NULL) 1271 goto out_existing; 1272 spin_unlock(&ino->i_lock); 1273 new = alloc_init_layout_hdr(ino, ctx, gfp_flags); 1274 spin_lock(&ino->i_lock); 1275 1276 if (likely(nfsi->layout == NULL)) { /* Won the race? */ 1277 nfsi->layout = new; 1278 return new; 1279 } else if (new != NULL) 1280 pnfs_free_layout_hdr(new); 1281 out_existing: 1282 pnfs_get_layout_hdr(nfsi->layout); 1283 return nfsi->layout; 1284 } 1285 1286 /* 1287 * iomode matching rules: 1288 * iomode lseg match 1289 * ----- ----- ----- 1290 * ANY READ true 1291 * ANY RW true 1292 * RW READ false 1293 * RW RW true 1294 * READ READ true 1295 * READ RW true 1296 */ 1297 static bool 1298 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, 1299 const struct pnfs_layout_range *range) 1300 { 1301 struct pnfs_layout_range range1; 1302 1303 if ((range->iomode == IOMODE_RW && 1304 ls_range->iomode != IOMODE_RW) || 1305 !pnfs_lseg_range_intersecting(ls_range, range)) 1306 return 0; 1307 1308 /* range1 covers only the first byte in the range */ 1309 range1 = *range; 1310 range1.length = 1; 1311 return pnfs_lseg_range_contained(ls_range, &range1); 1312 } 1313 1314 /* 1315 * lookup range in layout 1316 */ 1317 static struct pnfs_layout_segment * 1318 pnfs_find_lseg(struct pnfs_layout_hdr *lo, 1319 struct pnfs_layout_range *range) 1320 { 1321 struct pnfs_layout_segment *lseg, *ret = NULL; 1322 1323 dprintk("%s:Begin\n", __func__); 1324 1325 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 1326 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && 1327 !test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) && 1328 pnfs_lseg_range_match(&lseg->pls_range, range)) { 1329 ret = pnfs_get_lseg(lseg); 1330 break; 1331 } 1332 if (lseg->pls_range.offset > range->offset) 1333 break; 1334 } 1335 1336 dprintk("%s:Return lseg %p ref %d\n", 1337 __func__, ret, ret ? atomic_read(&ret->pls_refcount) : 0); 1338 return ret; 1339 } 1340 1341 /* 1342 * Use mdsthreshold hints set at each OPEN to determine if I/O should go 1343 * to the MDS or over pNFS 1344 * 1345 * The nfs_inode read_io and write_io fields are cumulative counters reset 1346 * when there are no layout segments. Note that in pnfs_update_layout iomode 1347 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a 1348 * WRITE request. 1349 * 1350 * A return of true means use MDS I/O. 1351 * 1352 * From rfc 5661: 1353 * If a file's size is smaller than the file size threshold, data accesses 1354 * SHOULD be sent to the metadata server. If an I/O request has a length that 1355 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata 1356 * server. If both file size and I/O size are provided, the client SHOULD 1357 * reach or exceed both thresholds before sending its read or write 1358 * requests to the data server. 1359 */ 1360 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, 1361 struct inode *ino, int iomode) 1362 { 1363 struct nfs4_threshold *t = ctx->mdsthreshold; 1364 struct nfs_inode *nfsi = NFS_I(ino); 1365 loff_t fsize = i_size_read(ino); 1366 bool size = false, size_set = false, io = false, io_set = false, ret = false; 1367 1368 if (t == NULL) 1369 return ret; 1370 1371 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", 1372 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); 1373 1374 switch (iomode) { 1375 case IOMODE_READ: 1376 if (t->bm & THRESHOLD_RD) { 1377 dprintk("%s fsize %llu\n", __func__, fsize); 1378 size_set = true; 1379 if (fsize < t->rd_sz) 1380 size = true; 1381 } 1382 if (t->bm & THRESHOLD_RD_IO) { 1383 dprintk("%s nfsi->read_io %llu\n", __func__, 1384 nfsi->read_io); 1385 io_set = true; 1386 if (nfsi->read_io < t->rd_io_sz) 1387 io = true; 1388 } 1389 break; 1390 case IOMODE_RW: 1391 if (t->bm & THRESHOLD_WR) { 1392 dprintk("%s fsize %llu\n", __func__, fsize); 1393 size_set = true; 1394 if (fsize < t->wr_sz) 1395 size = true; 1396 } 1397 if (t->bm & THRESHOLD_WR_IO) { 1398 dprintk("%s nfsi->write_io %llu\n", __func__, 1399 nfsi->write_io); 1400 io_set = true; 1401 if (nfsi->write_io < t->wr_io_sz) 1402 io = true; 1403 } 1404 break; 1405 } 1406 if (size_set && io_set) { 1407 if (size && io) 1408 ret = true; 1409 } else if (size || io) 1410 ret = true; 1411 1412 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); 1413 return ret; 1414 } 1415 1416 /* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */ 1417 static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key) 1418 { 1419 if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags)) 1420 return 1; 1421 return nfs_wait_bit_killable(key); 1422 } 1423 1424 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) 1425 { 1426 /* 1427 * send layoutcommit as it can hold up layoutreturn due to lseg 1428 * reference 1429 */ 1430 pnfs_layoutcommit_inode(lo->plh_inode, false); 1431 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, 1432 pnfs_layoutget_retry_bit_wait, 1433 TASK_UNINTERRUPTIBLE); 1434 } 1435 1436 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) 1437 { 1438 unsigned long *bitlock = &lo->plh_flags; 1439 1440 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); 1441 smp_mb__after_atomic(); 1442 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); 1443 } 1444 1445 /* 1446 * Layout segment is retreived from the server if not cached. 1447 * The appropriate layout segment is referenced and returned to the caller. 1448 */ 1449 struct pnfs_layout_segment * 1450 pnfs_update_layout(struct inode *ino, 1451 struct nfs_open_context *ctx, 1452 loff_t pos, 1453 u64 count, 1454 enum pnfs_iomode iomode, 1455 gfp_t gfp_flags) 1456 { 1457 struct pnfs_layout_range arg = { 1458 .iomode = iomode, 1459 .offset = pos, 1460 .length = count, 1461 }; 1462 unsigned pg_offset; 1463 struct nfs_server *server = NFS_SERVER(ino); 1464 struct nfs_client *clp = server->nfs_client; 1465 struct pnfs_layout_hdr *lo; 1466 struct pnfs_layout_segment *lseg = NULL; 1467 bool first; 1468 1469 if (!pnfs_enabled_sb(NFS_SERVER(ino))) 1470 goto out; 1471 1472 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) 1473 goto out; 1474 1475 lookup_again: 1476 first = false; 1477 spin_lock(&ino->i_lock); 1478 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); 1479 if (lo == NULL) { 1480 spin_unlock(&ino->i_lock); 1481 goto out; 1482 } 1483 1484 /* Do we even need to bother with this? */ 1485 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1486 dprintk("%s matches recall, use MDS\n", __func__); 1487 goto out_unlock; 1488 } 1489 1490 /* if LAYOUTGET already failed once we don't try again */ 1491 if (pnfs_layout_io_test_failed(lo, iomode) && 1492 !pnfs_should_retry_layoutget(lo)) 1493 goto out_unlock; 1494 1495 first = list_empty(&lo->plh_segs); 1496 if (first) { 1497 /* The first layoutget for the file. Need to serialize per 1498 * RFC 5661 Errata 3208. 1499 */ 1500 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, 1501 &lo->plh_flags)) { 1502 spin_unlock(&ino->i_lock); 1503 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET, 1504 TASK_UNINTERRUPTIBLE); 1505 pnfs_put_layout_hdr(lo); 1506 goto lookup_again; 1507 } 1508 } else { 1509 /* Check to see if the layout for the given range 1510 * already exists 1511 */ 1512 lseg = pnfs_find_lseg(lo, &arg); 1513 if (lseg) 1514 goto out_unlock; 1515 } 1516 1517 /* 1518 * Because we free lsegs before sending LAYOUTRETURN, we need to wait 1519 * for LAYOUTRETURN even if first is true. 1520 */ 1521 if (!lseg && pnfs_should_retry_layoutget(lo) && 1522 test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1523 spin_unlock(&ino->i_lock); 1524 dprintk("%s wait for layoutreturn\n", __func__); 1525 if (pnfs_prepare_to_retry_layoutget(lo)) { 1526 if (first) 1527 pnfs_clear_first_layoutget(lo); 1528 pnfs_put_layout_hdr(lo); 1529 dprintk("%s retrying\n", __func__); 1530 goto lookup_again; 1531 } 1532 goto out_put_layout_hdr; 1533 } 1534 1535 if (pnfs_layoutgets_blocked(lo, &arg, 0)) 1536 goto out_unlock; 1537 atomic_inc(&lo->plh_outstanding); 1538 spin_unlock(&ino->i_lock); 1539 1540 if (list_empty(&lo->plh_layouts)) { 1541 /* The lo must be on the clp list if there is any 1542 * chance of a CB_LAYOUTRECALL(FILE) coming in. 1543 */ 1544 spin_lock(&clp->cl_lock); 1545 if (list_empty(&lo->plh_layouts)) 1546 list_add_tail(&lo->plh_layouts, &server->layouts); 1547 spin_unlock(&clp->cl_lock); 1548 } 1549 1550 pg_offset = arg.offset & ~PAGE_CACHE_MASK; 1551 if (pg_offset) { 1552 arg.offset -= pg_offset; 1553 arg.length += pg_offset; 1554 } 1555 if (arg.length != NFS4_MAX_UINT64) 1556 arg.length = PAGE_CACHE_ALIGN(arg.length); 1557 1558 lseg = send_layoutget(lo, ctx, &arg, gfp_flags); 1559 pnfs_clear_retry_layoutget(lo); 1560 atomic_dec(&lo->plh_outstanding); 1561 out_put_layout_hdr: 1562 if (first) 1563 pnfs_clear_first_layoutget(lo); 1564 pnfs_put_layout_hdr(lo); 1565 out: 1566 dprintk("%s: inode %s/%llu pNFS layout segment %s for " 1567 "(%s, offset: %llu, length: %llu)\n", 1568 __func__, ino->i_sb->s_id, 1569 (unsigned long long)NFS_FILEID(ino), 1570 lseg == NULL ? "not found" : "found", 1571 iomode==IOMODE_RW ? "read/write" : "read-only", 1572 (unsigned long long)pos, 1573 (unsigned long long)count); 1574 return lseg; 1575 out_unlock: 1576 spin_unlock(&ino->i_lock); 1577 goto out_put_layout_hdr; 1578 } 1579 EXPORT_SYMBOL_GPL(pnfs_update_layout); 1580 1581 struct pnfs_layout_segment * 1582 pnfs_layout_process(struct nfs4_layoutget *lgp) 1583 { 1584 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; 1585 struct nfs4_layoutget_res *res = &lgp->res; 1586 struct pnfs_layout_segment *lseg; 1587 struct inode *ino = lo->plh_inode; 1588 LIST_HEAD(free_me); 1589 int status = 0; 1590 1591 /* Inject layout blob into I/O device driver */ 1592 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); 1593 if (!lseg || IS_ERR(lseg)) { 1594 if (!lseg) 1595 status = -ENOMEM; 1596 else 1597 status = PTR_ERR(lseg); 1598 dprintk("%s: Could not allocate layout: error %d\n", 1599 __func__, status); 1600 goto out; 1601 } 1602 1603 init_lseg(lo, lseg); 1604 lseg->pls_range = res->range; 1605 1606 spin_lock(&ino->i_lock); 1607 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1608 dprintk("%s forget reply due to recall\n", __func__); 1609 goto out_forget_reply; 1610 } 1611 1612 if (pnfs_layoutgets_blocked(lo, &lgp->args.range, 1)) { 1613 dprintk("%s forget reply due to state\n", __func__); 1614 goto out_forget_reply; 1615 } 1616 1617 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { 1618 /* existing state ID, make sure the sequence number matches. */ 1619 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { 1620 dprintk("%s forget reply due to sequence\n", __func__); 1621 goto out_forget_reply; 1622 } 1623 pnfs_set_layout_stateid(lo, &res->stateid, false); 1624 } else { 1625 /* 1626 * We got an entirely new state ID. Mark all segments for the 1627 * inode invalid, and don't bother validating the stateid 1628 * sequence number. 1629 */ 1630 pnfs_mark_matching_lsegs_invalid(lo, &free_me, NULL); 1631 1632 nfs4_stateid_copy(&lo->plh_stateid, &res->stateid); 1633 lo->plh_barrier = be32_to_cpu(res->stateid.seqid); 1634 } 1635 1636 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 1637 1638 pnfs_get_lseg(lseg); 1639 pnfs_layout_insert_lseg(lo, lseg); 1640 1641 if (res->return_on_close) { 1642 set_bit(NFS_LSEG_ROC, &lseg->pls_flags); 1643 set_bit(NFS_LAYOUT_ROC, &lo->plh_flags); 1644 } 1645 1646 spin_unlock(&ino->i_lock); 1647 pnfs_free_lseg_list(&free_me); 1648 return lseg; 1649 out: 1650 return ERR_PTR(status); 1651 1652 out_forget_reply: 1653 spin_unlock(&ino->i_lock); 1654 lseg->pls_layout = lo; 1655 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 1656 goto out; 1657 } 1658 1659 static void 1660 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 1661 struct list_head *tmp_list, 1662 struct pnfs_layout_range *return_range) 1663 { 1664 struct pnfs_layout_segment *lseg, *next; 1665 1666 dprintk("%s:Begin lo %p\n", __func__, lo); 1667 1668 if (list_empty(&lo->plh_segs)) 1669 return; 1670 1671 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 1672 if (should_free_lseg(&lseg->pls_range, return_range)) { 1673 dprintk("%s: marking lseg %p iomode %d " 1674 "offset %llu length %llu\n", __func__, 1675 lseg, lseg->pls_range.iomode, 1676 lseg->pls_range.offset, 1677 lseg->pls_range.length); 1678 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 1679 mark_lseg_invalid(lseg, tmp_list); 1680 } 1681 } 1682 1683 void pnfs_error_mark_layout_for_return(struct inode *inode, 1684 struct pnfs_layout_segment *lseg) 1685 { 1686 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; 1687 int iomode = pnfs_iomode_to_fail_bit(lseg->pls_range.iomode); 1688 struct pnfs_layout_range range = { 1689 .iomode = lseg->pls_range.iomode, 1690 .offset = 0, 1691 .length = NFS4_MAX_UINT64, 1692 }; 1693 LIST_HEAD(free_me); 1694 1695 spin_lock(&inode->i_lock); 1696 /* set failure bit so that pnfs path will be retried later */ 1697 pnfs_layout_set_fail_bit(lo, iomode); 1698 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 1699 if (lo->plh_return_iomode == 0) 1700 lo->plh_return_iomode = range.iomode; 1701 else if (lo->plh_return_iomode != range.iomode) 1702 lo->plh_return_iomode = IOMODE_ANY; 1703 /* 1704 * mark all matching lsegs so that we are sure to have no live 1705 * segments at hand when sending layoutreturn. See pnfs_put_lseg() 1706 * for how it works. 1707 */ 1708 pnfs_mark_matching_lsegs_return(lo, &free_me, &range); 1709 spin_unlock(&inode->i_lock); 1710 pnfs_free_lseg_list(&free_me); 1711 } 1712 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); 1713 1714 void 1715 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 1716 { 1717 u64 rd_size = req->wb_bytes; 1718 1719 if (pgio->pg_lseg == NULL) { 1720 if (pgio->pg_dreq == NULL) 1721 rd_size = i_size_read(pgio->pg_inode) - req_offset(req); 1722 else 1723 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq); 1724 1725 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 1726 req->wb_context, 1727 req_offset(req), 1728 rd_size, 1729 IOMODE_READ, 1730 GFP_KERNEL); 1731 } 1732 /* If no lseg, fall back to read through mds */ 1733 if (pgio->pg_lseg == NULL) 1734 nfs_pageio_reset_read_mds(pgio); 1735 1736 } 1737 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); 1738 1739 void 1740 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 1741 struct nfs_page *req, u64 wb_size) 1742 { 1743 if (pgio->pg_lseg == NULL) 1744 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 1745 req->wb_context, 1746 req_offset(req), 1747 wb_size, 1748 IOMODE_RW, 1749 GFP_NOFS); 1750 /* If no lseg, fall back to write through mds */ 1751 if (pgio->pg_lseg == NULL) 1752 nfs_pageio_reset_write_mds(pgio); 1753 } 1754 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); 1755 1756 void 1757 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) 1758 { 1759 if (desc->pg_lseg) { 1760 pnfs_put_lseg(desc->pg_lseg); 1761 desc->pg_lseg = NULL; 1762 } 1763 } 1764 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); 1765 1766 /* 1767 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 1768 * of bytes (maximum @req->wb_bytes) that can be coalesced. 1769 */ 1770 size_t 1771 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 1772 struct nfs_page *prev, struct nfs_page *req) 1773 { 1774 unsigned int size; 1775 u64 seg_end, req_start, seg_left; 1776 1777 size = nfs_generic_pg_test(pgio, prev, req); 1778 if (!size) 1779 return 0; 1780 1781 /* 1782 * 'size' contains the number of bytes left in the current page (up 1783 * to the original size asked for in @req->wb_bytes). 1784 * 1785 * Calculate how many bytes are left in the layout segment 1786 * and if there are less bytes than 'size', return that instead. 1787 * 1788 * Please also note that 'end_offset' is actually the offset of the 1789 * first byte that lies outside the pnfs_layout_range. FIXME? 1790 * 1791 */ 1792 if (pgio->pg_lseg) { 1793 seg_end = end_offset(pgio->pg_lseg->pls_range.offset, 1794 pgio->pg_lseg->pls_range.length); 1795 req_start = req_offset(req); 1796 WARN_ON_ONCE(req_start >= seg_end); 1797 /* start of request is past the last byte of this segment */ 1798 if (req_start >= seg_end) { 1799 /* reference the new lseg */ 1800 if (pgio->pg_ops->pg_cleanup) 1801 pgio->pg_ops->pg_cleanup(pgio); 1802 if (pgio->pg_ops->pg_init) 1803 pgio->pg_ops->pg_init(pgio, req); 1804 return 0; 1805 } 1806 1807 /* adjust 'size' iff there are fewer bytes left in the 1808 * segment than what nfs_generic_pg_test returned */ 1809 seg_left = seg_end - req_start; 1810 if (seg_left < size) 1811 size = (unsigned int)seg_left; 1812 } 1813 1814 return size; 1815 } 1816 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); 1817 1818 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) 1819 { 1820 struct nfs_pageio_descriptor pgio; 1821 1822 /* Resend all requests through the MDS */ 1823 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, 1824 hdr->completion_ops); 1825 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags); 1826 return nfs_pageio_resend(&pgio, hdr); 1827 } 1828 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); 1829 1830 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) 1831 { 1832 1833 dprintk("pnfs write error = %d\n", hdr->pnfs_error); 1834 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 1835 PNFS_LAYOUTRET_ON_ERROR) { 1836 pnfs_return_layout(hdr->inode); 1837 } 1838 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 1839 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); 1840 } 1841 1842 /* 1843 * Called by non rpc-based layout drivers 1844 */ 1845 void pnfs_ld_write_done(struct nfs_pgio_header *hdr) 1846 { 1847 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); 1848 if (!hdr->pnfs_error) { 1849 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, 1850 hdr->mds_offset + hdr->res.count); 1851 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 1852 } else 1853 pnfs_ld_handle_write_error(hdr); 1854 hdr->mds_ops->rpc_release(hdr); 1855 } 1856 EXPORT_SYMBOL_GPL(pnfs_ld_write_done); 1857 1858 static void 1859 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, 1860 struct nfs_pgio_header *hdr) 1861 { 1862 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 1863 1864 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1865 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 1866 nfs_pageio_reset_write_mds(desc); 1867 mirror->pg_recoalesce = 1; 1868 } 1869 nfs_pgio_data_destroy(hdr); 1870 hdr->release(hdr); 1871 } 1872 1873 static enum pnfs_try_status 1874 pnfs_try_to_write_data(struct nfs_pgio_header *hdr, 1875 const struct rpc_call_ops *call_ops, 1876 struct pnfs_layout_segment *lseg, 1877 int how) 1878 { 1879 struct inode *inode = hdr->inode; 1880 enum pnfs_try_status trypnfs; 1881 struct nfs_server *nfss = NFS_SERVER(inode); 1882 1883 hdr->mds_ops = call_ops; 1884 1885 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, 1886 inode->i_ino, hdr->args.count, hdr->args.offset, how); 1887 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); 1888 if (trypnfs != PNFS_NOT_ATTEMPTED) 1889 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); 1890 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 1891 return trypnfs; 1892 } 1893 1894 static void 1895 pnfs_do_write(struct nfs_pageio_descriptor *desc, 1896 struct nfs_pgio_header *hdr, int how) 1897 { 1898 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 1899 struct pnfs_layout_segment *lseg = desc->pg_lseg; 1900 enum pnfs_try_status trypnfs; 1901 1902 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); 1903 if (trypnfs == PNFS_NOT_ATTEMPTED) 1904 pnfs_write_through_mds(desc, hdr); 1905 } 1906 1907 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) 1908 { 1909 pnfs_put_lseg(hdr->lseg); 1910 nfs_pgio_header_free(hdr); 1911 } 1912 1913 int 1914 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 1915 { 1916 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 1917 1918 struct nfs_pgio_header *hdr; 1919 int ret; 1920 1921 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 1922 if (!hdr) { 1923 desc->pg_completion_ops->error_cleanup(&mirror->pg_list); 1924 return -ENOMEM; 1925 } 1926 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); 1927 1928 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 1929 ret = nfs_generic_pgio(desc, hdr); 1930 if (!ret) 1931 pnfs_do_write(desc, hdr, desc->pg_ioflags); 1932 1933 return ret; 1934 } 1935 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); 1936 1937 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) 1938 { 1939 struct nfs_pageio_descriptor pgio; 1940 1941 /* Resend all requests through the MDS */ 1942 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); 1943 return nfs_pageio_resend(&pgio, hdr); 1944 } 1945 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); 1946 1947 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) 1948 { 1949 dprintk("pnfs read error = %d\n", hdr->pnfs_error); 1950 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 1951 PNFS_LAYOUTRET_ON_ERROR) { 1952 pnfs_return_layout(hdr->inode); 1953 } 1954 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 1955 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); 1956 } 1957 1958 /* 1959 * Called by non rpc-based layout drivers 1960 */ 1961 void pnfs_ld_read_done(struct nfs_pgio_header *hdr) 1962 { 1963 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); 1964 if (likely(!hdr->pnfs_error)) { 1965 __nfs4_read_done_cb(hdr); 1966 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 1967 } else 1968 pnfs_ld_handle_read_error(hdr); 1969 hdr->mds_ops->rpc_release(hdr); 1970 } 1971 EXPORT_SYMBOL_GPL(pnfs_ld_read_done); 1972 1973 static void 1974 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, 1975 struct nfs_pgio_header *hdr) 1976 { 1977 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 1978 1979 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 1980 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 1981 nfs_pageio_reset_read_mds(desc); 1982 mirror->pg_recoalesce = 1; 1983 } 1984 nfs_pgio_data_destroy(hdr); 1985 hdr->release(hdr); 1986 } 1987 1988 /* 1989 * Call the appropriate parallel I/O subsystem read function. 1990 */ 1991 static enum pnfs_try_status 1992 pnfs_try_to_read_data(struct nfs_pgio_header *hdr, 1993 const struct rpc_call_ops *call_ops, 1994 struct pnfs_layout_segment *lseg) 1995 { 1996 struct inode *inode = hdr->inode; 1997 struct nfs_server *nfss = NFS_SERVER(inode); 1998 enum pnfs_try_status trypnfs; 1999 2000 hdr->mds_ops = call_ops; 2001 2002 dprintk("%s: Reading ino:%lu %u@%llu\n", 2003 __func__, inode->i_ino, hdr->args.count, hdr->args.offset); 2004 2005 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); 2006 if (trypnfs != PNFS_NOT_ATTEMPTED) 2007 nfs_inc_stats(inode, NFSIOS_PNFS_READ); 2008 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2009 return trypnfs; 2010 } 2011 2012 /* Resend all requests through pnfs. */ 2013 int pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr) 2014 { 2015 struct nfs_pageio_descriptor pgio; 2016 2017 nfs_pageio_init_read(&pgio, hdr->inode, false, hdr->completion_ops); 2018 return nfs_pageio_resend(&pgio, hdr); 2019 } 2020 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); 2021 2022 static void 2023 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) 2024 { 2025 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2026 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2027 enum pnfs_try_status trypnfs; 2028 int err = 0; 2029 2030 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); 2031 if (trypnfs == PNFS_TRY_AGAIN) 2032 err = pnfs_read_resend_pnfs(hdr); 2033 if (trypnfs == PNFS_NOT_ATTEMPTED || err) 2034 pnfs_read_through_mds(desc, hdr); 2035 } 2036 2037 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) 2038 { 2039 pnfs_put_lseg(hdr->lseg); 2040 nfs_pgio_header_free(hdr); 2041 } 2042 2043 int 2044 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) 2045 { 2046 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2047 2048 struct nfs_pgio_header *hdr; 2049 int ret; 2050 2051 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2052 if (!hdr) { 2053 desc->pg_completion_ops->error_cleanup(&mirror->pg_list); 2054 return -ENOMEM; 2055 } 2056 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); 2057 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 2058 ret = nfs_generic_pgio(desc, hdr); 2059 if (!ret) 2060 pnfs_do_read(desc, hdr); 2061 return ret; 2062 } 2063 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); 2064 2065 static void pnfs_clear_layoutcommitting(struct inode *inode) 2066 { 2067 unsigned long *bitlock = &NFS_I(inode)->flags; 2068 2069 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 2070 smp_mb__after_atomic(); 2071 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 2072 } 2073 2074 /* 2075 * There can be multiple RW segments. 2076 */ 2077 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 2078 { 2079 struct pnfs_layout_segment *lseg; 2080 2081 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { 2082 if (lseg->pls_range.iomode == IOMODE_RW && 2083 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 2084 list_add(&lseg->pls_lc_list, listp); 2085 } 2086 } 2087 2088 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) 2089 { 2090 struct pnfs_layout_segment *lseg, *tmp; 2091 2092 /* Matched by references in pnfs_set_layoutcommit */ 2093 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { 2094 list_del_init(&lseg->pls_lc_list); 2095 pnfs_put_lseg(lseg); 2096 } 2097 2098 pnfs_clear_layoutcommitting(inode); 2099 } 2100 2101 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) 2102 { 2103 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); 2104 } 2105 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); 2106 2107 void 2108 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, 2109 loff_t end_pos) 2110 { 2111 struct nfs_inode *nfsi = NFS_I(inode); 2112 bool mark_as_dirty = false; 2113 2114 spin_lock(&inode->i_lock); 2115 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 2116 nfsi->layout->plh_lwb = end_pos; 2117 mark_as_dirty = true; 2118 dprintk("%s: Set layoutcommit for inode %lu ", 2119 __func__, inode->i_ino); 2120 } else if (end_pos > nfsi->layout->plh_lwb) 2121 nfsi->layout->plh_lwb = end_pos; 2122 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { 2123 /* references matched in nfs4_layoutcommit_release */ 2124 pnfs_get_lseg(lseg); 2125 } 2126 spin_unlock(&inode->i_lock); 2127 dprintk("%s: lseg %p end_pos %llu\n", 2128 __func__, lseg, nfsi->layout->plh_lwb); 2129 2130 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one 2131 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ 2132 if (mark_as_dirty) 2133 mark_inode_dirty_sync(inode); 2134 } 2135 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); 2136 2137 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 2138 { 2139 struct nfs_server *nfss = NFS_SERVER(data->args.inode); 2140 2141 if (nfss->pnfs_curr_ld->cleanup_layoutcommit) 2142 nfss->pnfs_curr_ld->cleanup_layoutcommit(data); 2143 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); 2144 } 2145 2146 /* 2147 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and 2148 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough 2149 * data to disk to allow the server to recover the data if it crashes. 2150 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag 2151 * is off, and a COMMIT is sent to a data server, or 2152 * if WRITEs to a data server return NFS_DATA_SYNC. 2153 */ 2154 int 2155 pnfs_layoutcommit_inode(struct inode *inode, bool sync) 2156 { 2157 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 2158 struct nfs4_layoutcommit_data *data; 2159 struct nfs_inode *nfsi = NFS_I(inode); 2160 loff_t end_pos; 2161 int status; 2162 2163 if (!pnfs_layoutcommit_outstanding(inode)) 2164 return 0; 2165 2166 dprintk("--> %s inode %lu\n", __func__, inode->i_ino); 2167 2168 status = -EAGAIN; 2169 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { 2170 if (!sync) 2171 goto out; 2172 status = wait_on_bit_lock_action(&nfsi->flags, 2173 NFS_INO_LAYOUTCOMMITTING, 2174 nfs_wait_bit_killable, 2175 TASK_KILLABLE); 2176 if (status) 2177 goto out; 2178 } 2179 2180 status = -ENOMEM; 2181 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ 2182 data = kzalloc(sizeof(*data), GFP_NOFS); 2183 if (!data) 2184 goto clear_layoutcommitting; 2185 2186 status = 0; 2187 spin_lock(&inode->i_lock); 2188 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 2189 goto out_unlock; 2190 2191 INIT_LIST_HEAD(&data->lseg_list); 2192 pnfs_list_write_lseg(inode, &data->lseg_list); 2193 2194 end_pos = nfsi->layout->plh_lwb; 2195 2196 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); 2197 spin_unlock(&inode->i_lock); 2198 2199 data->args.inode = inode; 2200 data->cred = get_rpccred(nfsi->layout->plh_lc_cred); 2201 nfs_fattr_init(&data->fattr); 2202 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 2203 data->res.fattr = &data->fattr; 2204 data->args.lastbytewritten = end_pos - 1; 2205 data->res.server = NFS_SERVER(inode); 2206 2207 if (ld->prepare_layoutcommit) { 2208 status = ld->prepare_layoutcommit(&data->args); 2209 if (status) { 2210 spin_lock(&inode->i_lock); 2211 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); 2212 if (end_pos > nfsi->layout->plh_lwb) 2213 nfsi->layout->plh_lwb = end_pos; 2214 spin_unlock(&inode->i_lock); 2215 put_rpccred(data->cred); 2216 goto clear_layoutcommitting; 2217 } 2218 } 2219 2220 2221 status = nfs4_proc_layoutcommit(data, sync); 2222 out: 2223 if (status) 2224 mark_inode_dirty_sync(inode); 2225 dprintk("<-- %s status %d\n", __func__, status); 2226 return status; 2227 out_unlock: 2228 spin_unlock(&inode->i_lock); 2229 kfree(data); 2230 clear_layoutcommitting: 2231 pnfs_clear_layoutcommitting(inode); 2232 goto out; 2233 } 2234 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); 2235 2236 int 2237 pnfs_generic_sync(struct inode *inode, bool datasync) 2238 { 2239 return pnfs_layoutcommit_inode(inode, true); 2240 } 2241 EXPORT_SYMBOL_GPL(pnfs_generic_sync); 2242 2243 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 2244 { 2245 struct nfs4_threshold *thp; 2246 2247 thp = kzalloc(sizeof(*thp), GFP_NOFS); 2248 if (!thp) { 2249 dprintk("%s mdsthreshold allocation failed\n", __func__); 2250 return NULL; 2251 } 2252 return thp; 2253 } 2254 2255 #if IS_ENABLED(CONFIG_NFS_V4_2) 2256 int 2257 pnfs_report_layoutstat(struct inode *inode) 2258 { 2259 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 2260 struct nfs_server *server = NFS_SERVER(inode); 2261 struct nfs_inode *nfsi = NFS_I(inode); 2262 struct nfs42_layoutstat_data *data; 2263 struct pnfs_layout_hdr *hdr; 2264 int status = 0; 2265 2266 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) 2267 goto out; 2268 2269 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) 2270 goto out; 2271 2272 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) 2273 goto out; 2274 2275 spin_lock(&inode->i_lock); 2276 if (!NFS_I(inode)->layout) { 2277 spin_unlock(&inode->i_lock); 2278 goto out; 2279 } 2280 hdr = NFS_I(inode)->layout; 2281 pnfs_get_layout_hdr(hdr); 2282 spin_unlock(&inode->i_lock); 2283 2284 data = kzalloc(sizeof(*data), GFP_KERNEL); 2285 if (!data) { 2286 status = -ENOMEM; 2287 goto out_put; 2288 } 2289 2290 data->args.fh = NFS_FH(inode); 2291 data->args.inode = inode; 2292 nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid); 2293 status = ld->prepare_layoutstats(&data->args); 2294 if (status) 2295 goto out_free; 2296 2297 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); 2298 2299 out: 2300 dprintk("%s returns %d\n", __func__, status); 2301 return status; 2302 2303 out_free: 2304 kfree(data); 2305 out_put: 2306 pnfs_put_layout_hdr(hdr); 2307 smp_mb__before_atomic(); 2308 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); 2309 smp_mb__after_atomic(); 2310 goto out; 2311 } 2312 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); 2313 #endif 2314