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 <linux/sort.h> 34 #include "internal.h" 35 #include "pnfs.h" 36 #include "iostat.h" 37 #include "nfs4trace.h" 38 #include "delegation.h" 39 #include "nfs42.h" 40 #include "nfs4_fs.h" 41 42 #define NFSDBG_FACILITY NFSDBG_PNFS 43 #define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ) 44 45 /* Locking: 46 * 47 * pnfs_spinlock: 48 * protects pnfs_modules_tbl. 49 */ 50 static DEFINE_SPINLOCK(pnfs_spinlock); 51 52 /* 53 * pnfs_modules_tbl holds all pnfs modules 54 */ 55 static LIST_HEAD(pnfs_modules_tbl); 56 57 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo); 58 static void pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, 59 struct list_head *free_me, 60 const struct pnfs_layout_range *range, 61 u32 seq); 62 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, 63 struct list_head *tmp_list); 64 65 /* Return the registered pnfs layout driver module matching given id */ 66 static struct pnfs_layoutdriver_type * 67 find_pnfs_driver_locked(u32 id) 68 { 69 struct pnfs_layoutdriver_type *local; 70 71 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid) 72 if (local->id == id) 73 goto out; 74 local = NULL; 75 out: 76 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); 77 return local; 78 } 79 80 static struct pnfs_layoutdriver_type * 81 find_pnfs_driver(u32 id) 82 { 83 struct pnfs_layoutdriver_type *local; 84 85 spin_lock(&pnfs_spinlock); 86 local = find_pnfs_driver_locked(id); 87 if (local != NULL && !try_module_get(local->owner)) { 88 dprintk("%s: Could not grab reference on module\n", __func__); 89 local = NULL; 90 } 91 spin_unlock(&pnfs_spinlock); 92 return local; 93 } 94 95 void 96 unset_pnfs_layoutdriver(struct nfs_server *nfss) 97 { 98 if (nfss->pnfs_curr_ld) { 99 if (nfss->pnfs_curr_ld->clear_layoutdriver) 100 nfss->pnfs_curr_ld->clear_layoutdriver(nfss); 101 /* Decrement the MDS count. Purge the deviceid cache if zero */ 102 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count)) 103 nfs4_deviceid_purge_client(nfss->nfs_client); 104 module_put(nfss->pnfs_curr_ld->owner); 105 } 106 nfss->pnfs_curr_ld = NULL; 107 } 108 109 /* 110 * When the server sends a list of layout types, we choose one in the order 111 * given in the list below. 112 * 113 * FIXME: should this list be configurable in some fashion? module param? 114 * mount option? something else? 115 */ 116 static const u32 ld_prefs[] = { 117 LAYOUT_SCSI, 118 LAYOUT_BLOCK_VOLUME, 119 LAYOUT_OSD2_OBJECTS, 120 LAYOUT_FLEX_FILES, 121 LAYOUT_NFSV4_1_FILES, 122 0 123 }; 124 125 static int 126 ld_cmp(const void *e1, const void *e2) 127 { 128 u32 ld1 = *((u32 *)e1); 129 u32 ld2 = *((u32 *)e2); 130 int i; 131 132 for (i = 0; ld_prefs[i] != 0; i++) { 133 if (ld1 == ld_prefs[i]) 134 return -1; 135 136 if (ld2 == ld_prefs[i]) 137 return 1; 138 } 139 return 0; 140 } 141 142 /* 143 * Try to set the server's pnfs module to the pnfs layout type specified by id. 144 * Currently only one pNFS layout driver per filesystem is supported. 145 * 146 * @ids array of layout types supported by MDS. 147 */ 148 void 149 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, 150 struct nfs_fsinfo *fsinfo) 151 { 152 struct pnfs_layoutdriver_type *ld_type = NULL; 153 u32 id; 154 int i; 155 156 if (fsinfo->nlayouttypes == 0) 157 goto out_no_driver; 158 if (!(server->nfs_client->cl_exchange_flags & 159 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { 160 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n", 161 __func__, server->nfs_client->cl_exchange_flags); 162 goto out_no_driver; 163 } 164 165 sort(fsinfo->layouttype, fsinfo->nlayouttypes, 166 sizeof(*fsinfo->layouttype), ld_cmp, NULL); 167 168 for (i = 0; i < fsinfo->nlayouttypes; i++) { 169 id = fsinfo->layouttype[i]; 170 ld_type = find_pnfs_driver(id); 171 if (!ld_type) { 172 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, 173 id); 174 ld_type = find_pnfs_driver(id); 175 } 176 if (ld_type) 177 break; 178 } 179 180 if (!ld_type) { 181 dprintk("%s: No pNFS module found!\n", __func__); 182 goto out_no_driver; 183 } 184 185 server->pnfs_curr_ld = ld_type; 186 if (ld_type->set_layoutdriver 187 && ld_type->set_layoutdriver(server, mntfh)) { 188 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout " 189 "driver %u.\n", __func__, id); 190 module_put(ld_type->owner); 191 goto out_no_driver; 192 } 193 /* Bump the MDS count */ 194 atomic_inc(&server->nfs_client->cl_mds_count); 195 196 dprintk("%s: pNFS module for %u set\n", __func__, id); 197 return; 198 199 out_no_driver: 200 dprintk("%s: Using NFSv4 I/O\n", __func__); 201 server->pnfs_curr_ld = NULL; 202 } 203 204 int 205 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 206 { 207 int status = -EINVAL; 208 struct pnfs_layoutdriver_type *tmp; 209 210 if (ld_type->id == 0) { 211 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__); 212 return status; 213 } 214 if (!ld_type->alloc_lseg || !ld_type->free_lseg) { 215 printk(KERN_ERR "NFS: %s Layout driver must provide " 216 "alloc_lseg and free_lseg.\n", __func__); 217 return status; 218 } 219 220 spin_lock(&pnfs_spinlock); 221 tmp = find_pnfs_driver_locked(ld_type->id); 222 if (!tmp) { 223 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); 224 status = 0; 225 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, 226 ld_type->name); 227 } else { 228 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n", 229 __func__, ld_type->id); 230 } 231 spin_unlock(&pnfs_spinlock); 232 233 return status; 234 } 235 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); 236 237 void 238 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 239 { 240 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); 241 spin_lock(&pnfs_spinlock); 242 list_del(&ld_type->pnfs_tblid); 243 spin_unlock(&pnfs_spinlock); 244 } 245 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); 246 247 /* 248 * pNFS client layout cache 249 */ 250 251 /* Need to hold i_lock if caller does not already hold reference */ 252 void 253 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo) 254 { 255 refcount_inc(&lo->plh_refcount); 256 } 257 258 static struct pnfs_layout_hdr * 259 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) 260 { 261 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 262 return ld->alloc_layout_hdr(ino, gfp_flags); 263 } 264 265 static void 266 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) 267 { 268 struct nfs_server *server = NFS_SERVER(lo->plh_inode); 269 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; 270 271 if (!list_empty(&lo->plh_layouts)) { 272 struct nfs_client *clp = server->nfs_client; 273 274 spin_lock(&clp->cl_lock); 275 list_del_init(&lo->plh_layouts); 276 spin_unlock(&clp->cl_lock); 277 } 278 put_rpccred(lo->plh_lc_cred); 279 return ld->free_layout_hdr(lo); 280 } 281 282 static void 283 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) 284 { 285 struct nfs_inode *nfsi = NFS_I(lo->plh_inode); 286 dprintk("%s: freeing layout cache %p\n", __func__, lo); 287 nfsi->layout = NULL; 288 /* Reset MDS Threshold I/O counters */ 289 nfsi->write_io = 0; 290 nfsi->read_io = 0; 291 } 292 293 void 294 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) 295 { 296 struct inode *inode; 297 298 if (!lo) 299 return; 300 inode = lo->plh_inode; 301 pnfs_layoutreturn_before_put_layout_hdr(lo); 302 303 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { 304 if (!list_empty(&lo->plh_segs)) 305 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n"); 306 pnfs_detach_layout_hdr(lo); 307 spin_unlock(&inode->i_lock); 308 pnfs_free_layout_hdr(lo); 309 } 310 } 311 312 static void 313 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode, 314 u32 seq) 315 { 316 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode) 317 iomode = IOMODE_ANY; 318 lo->plh_return_iomode = iomode; 319 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); 320 if (seq != 0) { 321 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq); 322 lo->plh_return_seq = seq; 323 } 324 } 325 326 static void 327 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo) 328 { 329 struct pnfs_layout_segment *lseg; 330 lo->plh_return_iomode = 0; 331 lo->plh_return_seq = 0; 332 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); 333 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 334 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 335 continue; 336 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 337 } 338 } 339 340 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) 341 { 342 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); 343 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags); 344 smp_mb__after_atomic(); 345 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); 346 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq); 347 } 348 349 static void 350 pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg, 351 struct list_head *free_me) 352 { 353 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags); 354 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 355 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) 356 pnfs_lseg_dec_and_remove_zero(lseg, free_me); 357 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 358 pnfs_lseg_dec_and_remove_zero(lseg, free_me); 359 } 360 361 /* 362 * Update the seqid of a layout stateid 363 */ 364 bool nfs4_layoutreturn_refresh_stateid(nfs4_stateid *dst, 365 struct pnfs_layout_range *dst_range, 366 struct inode *inode) 367 { 368 struct pnfs_layout_hdr *lo; 369 struct pnfs_layout_range range = { 370 .iomode = IOMODE_ANY, 371 .offset = 0, 372 .length = NFS4_MAX_UINT64, 373 }; 374 bool ret = false; 375 LIST_HEAD(head); 376 int err; 377 378 spin_lock(&inode->i_lock); 379 lo = NFS_I(inode)->layout; 380 if (lo && nfs4_stateid_match_other(dst, &lo->plh_stateid)) { 381 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0); 382 if (err != -EBUSY) { 383 dst->seqid = lo->plh_stateid.seqid; 384 *dst_range = range; 385 ret = true; 386 } 387 } 388 spin_unlock(&inode->i_lock); 389 pnfs_free_lseg_list(&head); 390 return ret; 391 } 392 393 /* 394 * Mark a pnfs_layout_hdr and all associated layout segments as invalid 395 * 396 * In order to continue using the pnfs_layout_hdr, a full recovery 397 * is required. 398 * Note that caller must hold inode->i_lock. 399 */ 400 int 401 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, 402 struct list_head *lseg_list) 403 { 404 struct pnfs_layout_range range = { 405 .iomode = IOMODE_ANY, 406 .offset = 0, 407 .length = NFS4_MAX_UINT64, 408 }; 409 struct pnfs_layout_segment *lseg, *next; 410 411 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 412 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 413 pnfs_clear_lseg_state(lseg, lseg_list); 414 pnfs_clear_layoutreturn_info(lo); 415 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0); 416 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) && 417 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 418 pnfs_clear_layoutreturn_waitbit(lo); 419 return !list_empty(&lo->plh_segs); 420 } 421 422 static int 423 pnfs_iomode_to_fail_bit(u32 iomode) 424 { 425 return iomode == IOMODE_RW ? 426 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; 427 } 428 429 static void 430 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 431 { 432 lo->plh_retry_timestamp = jiffies; 433 if (!test_and_set_bit(fail_bit, &lo->plh_flags)) 434 refcount_inc(&lo->plh_refcount); 435 } 436 437 static void 438 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 439 { 440 if (test_and_clear_bit(fail_bit, &lo->plh_flags)) 441 refcount_dec(&lo->plh_refcount); 442 } 443 444 static void 445 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) 446 { 447 struct inode *inode = lo->plh_inode; 448 struct pnfs_layout_range range = { 449 .iomode = iomode, 450 .offset = 0, 451 .length = NFS4_MAX_UINT64, 452 }; 453 LIST_HEAD(head); 454 455 spin_lock(&inode->i_lock); 456 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 457 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0); 458 spin_unlock(&inode->i_lock); 459 pnfs_free_lseg_list(&head); 460 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, 461 iomode == IOMODE_RW ? "RW" : "READ"); 462 } 463 464 static bool 465 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) 466 { 467 unsigned long start, end; 468 int fail_bit = pnfs_iomode_to_fail_bit(iomode); 469 470 if (test_bit(fail_bit, &lo->plh_flags) == 0) 471 return false; 472 end = jiffies; 473 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; 474 if (!time_in_range(lo->plh_retry_timestamp, start, end)) { 475 /* It is time to retry the failed layoutgets */ 476 pnfs_layout_clear_fail_bit(lo, fail_bit); 477 return false; 478 } 479 return true; 480 } 481 482 static void 483 pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg, 484 const struct pnfs_layout_range *range, 485 const nfs4_stateid *stateid) 486 { 487 INIT_LIST_HEAD(&lseg->pls_list); 488 INIT_LIST_HEAD(&lseg->pls_lc_list); 489 refcount_set(&lseg->pls_refcount, 1); 490 set_bit(NFS_LSEG_VALID, &lseg->pls_flags); 491 lseg->pls_layout = lo; 492 lseg->pls_range = *range; 493 lseg->pls_seq = be32_to_cpu(stateid->seqid); 494 } 495 496 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) 497 { 498 if (lseg != NULL) { 499 struct inode *inode = lseg->pls_layout->plh_inode; 500 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg); 501 } 502 } 503 504 static void 505 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, 506 struct pnfs_layout_segment *lseg) 507 { 508 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 509 list_del_init(&lseg->pls_list); 510 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ 511 refcount_dec(&lo->plh_refcount); 512 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 513 return; 514 if (list_empty(&lo->plh_segs) && 515 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && 516 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 517 if (atomic_read(&lo->plh_outstanding) == 0) 518 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 519 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 520 } 521 } 522 523 static bool 524 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo, 525 struct pnfs_layout_segment *lseg) 526 { 527 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) && 528 pnfs_layout_is_valid(lo)) { 529 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 530 list_move_tail(&lseg->pls_list, &lo->plh_return_segs); 531 return true; 532 } 533 return false; 534 } 535 536 void 537 pnfs_put_lseg(struct pnfs_layout_segment *lseg) 538 { 539 struct pnfs_layout_hdr *lo; 540 struct inode *inode; 541 542 if (!lseg) 543 return; 544 545 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, 546 refcount_read(&lseg->pls_refcount), 547 test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 548 549 lo = lseg->pls_layout; 550 inode = lo->plh_inode; 551 552 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { 553 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 554 spin_unlock(&inode->i_lock); 555 return; 556 } 557 pnfs_get_layout_hdr(lo); 558 pnfs_layout_remove_lseg(lo, lseg); 559 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg)) 560 lseg = NULL; 561 spin_unlock(&inode->i_lock); 562 pnfs_free_lseg(lseg); 563 pnfs_put_layout_hdr(lo); 564 } 565 } 566 EXPORT_SYMBOL_GPL(pnfs_put_lseg); 567 568 /* 569 * is l2 fully contained in l1? 570 * start1 end1 571 * [----------------------------------) 572 * start2 end2 573 * [----------------) 574 */ 575 static bool 576 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, 577 const struct pnfs_layout_range *l2) 578 { 579 u64 start1 = l1->offset; 580 u64 end1 = pnfs_end_offset(start1, l1->length); 581 u64 start2 = l2->offset; 582 u64 end2 = pnfs_end_offset(start2, l2->length); 583 584 return (start1 <= start2) && (end1 >= end2); 585 } 586 587 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, 588 struct list_head *tmp_list) 589 { 590 if (!refcount_dec_and_test(&lseg->pls_refcount)) 591 return false; 592 pnfs_layout_remove_lseg(lseg->pls_layout, lseg); 593 list_add(&lseg->pls_list, tmp_list); 594 return true; 595 } 596 597 /* Returns 1 if lseg is removed from list, 0 otherwise */ 598 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, 599 struct list_head *tmp_list) 600 { 601 int rv = 0; 602 603 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 604 /* Remove the reference keeping the lseg in the 605 * list. It will now be removed when all 606 * outstanding io is finished. 607 */ 608 dprintk("%s: lseg %p ref %d\n", __func__, lseg, 609 refcount_read(&lseg->pls_refcount)); 610 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) 611 rv = 1; 612 } 613 return rv; 614 } 615 616 /* 617 * Compare 2 layout stateid sequence ids, to see which is newer, 618 * taking into account wraparound issues. 619 */ 620 static bool pnfs_seqid_is_newer(u32 s1, u32 s2) 621 { 622 return (s32)(s1 - s2) > 0; 623 } 624 625 static bool 626 pnfs_should_free_range(const struct pnfs_layout_range *lseg_range, 627 const struct pnfs_layout_range *recall_range) 628 { 629 return (recall_range->iomode == IOMODE_ANY || 630 lseg_range->iomode == recall_range->iomode) && 631 pnfs_lseg_range_intersecting(lseg_range, recall_range); 632 } 633 634 static bool 635 pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg, 636 const struct pnfs_layout_range *recall_range, 637 u32 seq) 638 { 639 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq)) 640 return false; 641 if (recall_range == NULL) 642 return true; 643 return pnfs_should_free_range(&lseg->pls_range, recall_range); 644 } 645 646 /** 647 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later 648 * @lo: layout header containing the lsegs 649 * @tmp_list: list head where doomed lsegs should go 650 * @recall_range: optional recall range argument to match (may be NULL) 651 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0) 652 * 653 * Walk the list of lsegs in the layout header, and tear down any that should 654 * be destroyed. If "recall_range" is specified then the segment must match 655 * that range. If "seq" is non-zero, then only match segments that were handed 656 * out at or before that sequence. 657 * 658 * Returns number of matching invalid lsegs remaining in list after scanning 659 * it and purging them. 660 */ 661 int 662 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 663 struct list_head *tmp_list, 664 const struct pnfs_layout_range *recall_range, 665 u32 seq) 666 { 667 struct pnfs_layout_segment *lseg, *next; 668 int remaining = 0; 669 670 dprintk("%s:Begin lo %p\n", __func__, lo); 671 672 if (list_empty(&lo->plh_segs)) 673 return 0; 674 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 675 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) { 676 dprintk("%s: freeing lseg %p iomode %d seq %u " 677 "offset %llu length %llu\n", __func__, 678 lseg, lseg->pls_range.iomode, lseg->pls_seq, 679 lseg->pls_range.offset, lseg->pls_range.length); 680 if (!mark_lseg_invalid(lseg, tmp_list)) 681 remaining++; 682 } 683 dprintk("%s:Return %i\n", __func__, remaining); 684 return remaining; 685 } 686 687 static void 688 pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, 689 struct list_head *free_me, 690 const struct pnfs_layout_range *range, 691 u32 seq) 692 { 693 struct pnfs_layout_segment *lseg, *next; 694 695 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) { 696 if (pnfs_match_lseg_recall(lseg, range, seq)) 697 list_move_tail(&lseg->pls_list, free_me); 698 } 699 } 700 701 /* note free_me must contain lsegs from a single layout_hdr */ 702 void 703 pnfs_free_lseg_list(struct list_head *free_me) 704 { 705 struct pnfs_layout_segment *lseg, *tmp; 706 707 if (list_empty(free_me)) 708 return; 709 710 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { 711 list_del(&lseg->pls_list); 712 pnfs_free_lseg(lseg); 713 } 714 } 715 716 void 717 pnfs_destroy_layout(struct nfs_inode *nfsi) 718 { 719 struct pnfs_layout_hdr *lo; 720 LIST_HEAD(tmp_list); 721 722 spin_lock(&nfsi->vfs_inode.i_lock); 723 lo = nfsi->layout; 724 if (lo) { 725 pnfs_get_layout_hdr(lo); 726 pnfs_mark_layout_stateid_invalid(lo, &tmp_list); 727 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); 728 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); 729 spin_unlock(&nfsi->vfs_inode.i_lock); 730 pnfs_free_lseg_list(&tmp_list); 731 nfs_commit_inode(&nfsi->vfs_inode, 0); 732 pnfs_put_layout_hdr(lo); 733 } else 734 spin_unlock(&nfsi->vfs_inode.i_lock); 735 } 736 EXPORT_SYMBOL_GPL(pnfs_destroy_layout); 737 738 static bool 739 pnfs_layout_add_bulk_destroy_list(struct inode *inode, 740 struct list_head *layout_list) 741 { 742 struct pnfs_layout_hdr *lo; 743 bool ret = false; 744 745 spin_lock(&inode->i_lock); 746 lo = NFS_I(inode)->layout; 747 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) { 748 pnfs_get_layout_hdr(lo); 749 list_add(&lo->plh_bulk_destroy, layout_list); 750 ret = true; 751 } 752 spin_unlock(&inode->i_lock); 753 return ret; 754 } 755 756 /* Caller must hold rcu_read_lock and clp->cl_lock */ 757 static int 758 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp, 759 struct nfs_server *server, 760 struct list_head *layout_list) 761 { 762 struct pnfs_layout_hdr *lo, *next; 763 struct inode *inode; 764 765 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) { 766 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) 767 continue; 768 inode = igrab(lo->plh_inode); 769 if (inode == NULL) 770 continue; 771 list_del_init(&lo->plh_layouts); 772 if (pnfs_layout_add_bulk_destroy_list(inode, layout_list)) 773 continue; 774 rcu_read_unlock(); 775 spin_unlock(&clp->cl_lock); 776 iput(inode); 777 spin_lock(&clp->cl_lock); 778 rcu_read_lock(); 779 return -EAGAIN; 780 } 781 return 0; 782 } 783 784 static int 785 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, 786 bool is_bulk_recall) 787 { 788 struct pnfs_layout_hdr *lo; 789 struct inode *inode; 790 LIST_HEAD(lseg_list); 791 int ret = 0; 792 793 while (!list_empty(layout_list)) { 794 lo = list_entry(layout_list->next, struct pnfs_layout_hdr, 795 plh_bulk_destroy); 796 dprintk("%s freeing layout for inode %lu\n", __func__, 797 lo->plh_inode->i_ino); 798 inode = lo->plh_inode; 799 800 pnfs_layoutcommit_inode(inode, false); 801 802 spin_lock(&inode->i_lock); 803 list_del_init(&lo->plh_bulk_destroy); 804 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) { 805 if (is_bulk_recall) 806 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 807 ret = -EAGAIN; 808 } 809 spin_unlock(&inode->i_lock); 810 pnfs_free_lseg_list(&lseg_list); 811 /* Free all lsegs that are attached to commit buckets */ 812 nfs_commit_inode(inode, 0); 813 pnfs_put_layout_hdr(lo); 814 iput(inode); 815 } 816 return ret; 817 } 818 819 int 820 pnfs_destroy_layouts_byfsid(struct nfs_client *clp, 821 struct nfs_fsid *fsid, 822 bool is_recall) 823 { 824 struct nfs_server *server; 825 LIST_HEAD(layout_list); 826 827 spin_lock(&clp->cl_lock); 828 rcu_read_lock(); 829 restart: 830 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 831 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0) 832 continue; 833 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 834 server, 835 &layout_list) != 0) 836 goto restart; 837 } 838 rcu_read_unlock(); 839 spin_unlock(&clp->cl_lock); 840 841 if (list_empty(&layout_list)) 842 return 0; 843 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 844 } 845 846 int 847 pnfs_destroy_layouts_byclid(struct nfs_client *clp, 848 bool is_recall) 849 { 850 struct nfs_server *server; 851 LIST_HEAD(layout_list); 852 853 spin_lock(&clp->cl_lock); 854 rcu_read_lock(); 855 restart: 856 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 857 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 858 server, 859 &layout_list) != 0) 860 goto restart; 861 } 862 rcu_read_unlock(); 863 spin_unlock(&clp->cl_lock); 864 865 if (list_empty(&layout_list)) 866 return 0; 867 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 868 } 869 870 /* 871 * Called by the state manger to remove all layouts established under an 872 * expired lease. 873 */ 874 void 875 pnfs_destroy_all_layouts(struct nfs_client *clp) 876 { 877 nfs4_deviceid_mark_client_invalid(clp); 878 nfs4_deviceid_purge_client(clp); 879 880 pnfs_destroy_layouts_byclid(clp, false); 881 } 882 883 /* update lo->plh_stateid with new if is more recent */ 884 void 885 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, 886 bool update_barrier) 887 { 888 u32 oldseq, newseq, new_barrier = 0; 889 890 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 891 newseq = be32_to_cpu(new->seqid); 892 893 if (!pnfs_layout_is_valid(lo)) { 894 nfs4_stateid_copy(&lo->plh_stateid, new); 895 lo->plh_barrier = newseq; 896 pnfs_clear_layoutreturn_info(lo); 897 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 898 return; 899 } 900 if (pnfs_seqid_is_newer(newseq, oldseq)) { 901 nfs4_stateid_copy(&lo->plh_stateid, new); 902 /* 903 * Because of wraparound, we want to keep the barrier 904 * "close" to the current seqids. 905 */ 906 new_barrier = newseq - atomic_read(&lo->plh_outstanding); 907 } 908 if (update_barrier) 909 new_barrier = be32_to_cpu(new->seqid); 910 else if (new_barrier == 0) 911 return; 912 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier)) 913 lo->plh_barrier = new_barrier; 914 } 915 916 static bool 917 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, 918 const nfs4_stateid *stateid) 919 { 920 u32 seqid = be32_to_cpu(stateid->seqid); 921 922 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier); 923 } 924 925 /* lget is set to 1 if called from inside send_layoutget call chain */ 926 static bool 927 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo) 928 { 929 return lo->plh_block_lgets || 930 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 931 } 932 933 static struct nfs_server * 934 pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx) 935 { 936 struct nfs_server *server; 937 938 if (inode) { 939 server = NFS_SERVER(inode); 940 } else { 941 struct dentry *parent_dir = dget_parent(ctx->dentry); 942 server = NFS_SERVER(parent_dir->d_inode); 943 dput(parent_dir); 944 } 945 return server; 946 } 947 948 static void nfs4_free_pages(struct page **pages, size_t size) 949 { 950 int i; 951 952 if (!pages) 953 return; 954 955 for (i = 0; i < size; i++) { 956 if (!pages[i]) 957 break; 958 __free_page(pages[i]); 959 } 960 kfree(pages); 961 } 962 963 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 964 { 965 struct page **pages; 966 int i; 967 968 pages = kcalloc(size, sizeof(struct page *), gfp_flags); 969 if (!pages) { 970 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 971 return NULL; 972 } 973 974 for (i = 0; i < size; i++) { 975 pages[i] = alloc_page(gfp_flags); 976 if (!pages[i]) { 977 dprintk("%s: failed to allocate page\n", __func__); 978 nfs4_free_pages(pages, size); 979 return NULL; 980 } 981 } 982 983 return pages; 984 } 985 986 static struct nfs4_layoutget * 987 pnfs_alloc_init_layoutget_args(struct inode *ino, 988 struct nfs_open_context *ctx, 989 const nfs4_stateid *stateid, 990 const struct pnfs_layout_range *range, 991 gfp_t gfp_flags) 992 { 993 struct nfs_server *server = pnfs_find_server(ino, ctx); 994 size_t max_pages = max_response_pages(server); 995 struct nfs4_layoutget *lgp; 996 997 dprintk("--> %s\n", __func__); 998 999 lgp = kzalloc(sizeof(*lgp), gfp_flags); 1000 if (lgp == NULL) 1001 return NULL; 1002 1003 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 1004 if (!lgp->args.layout.pages) { 1005 kfree(lgp); 1006 return NULL; 1007 } 1008 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 1009 lgp->res.layoutp = &lgp->args.layout; 1010 1011 /* Don't confuse uninitialised result and success */ 1012 lgp->res.status = -NFS4ERR_DELAY; 1013 1014 lgp->args.minlength = PAGE_SIZE; 1015 if (lgp->args.minlength > range->length) 1016 lgp->args.minlength = range->length; 1017 if (ino) { 1018 loff_t i_size = i_size_read(ino); 1019 1020 if (range->iomode == IOMODE_READ) { 1021 if (range->offset >= i_size) 1022 lgp->args.minlength = 0; 1023 else if (i_size - range->offset < lgp->args.minlength) 1024 lgp->args.minlength = i_size - range->offset; 1025 } 1026 } 1027 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; 1028 pnfs_copy_range(&lgp->args.range, range); 1029 lgp->args.type = server->pnfs_curr_ld->id; 1030 lgp->args.inode = ino; 1031 lgp->args.ctx = get_nfs_open_context(ctx); 1032 nfs4_stateid_copy(&lgp->args.stateid, stateid); 1033 lgp->gfp_flags = gfp_flags; 1034 lgp->cred = get_rpccred(ctx->cred); 1035 return lgp; 1036 } 1037 1038 void pnfs_layoutget_free(struct nfs4_layoutget *lgp) 1039 { 1040 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE; 1041 1042 nfs4_free_pages(lgp->args.layout.pages, max_pages); 1043 if (lgp->args.inode) 1044 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout); 1045 put_rpccred(lgp->cred); 1046 put_nfs_open_context(lgp->args.ctx); 1047 kfree(lgp); 1048 } 1049 1050 static void pnfs_clear_layoutcommit(struct inode *inode, 1051 struct list_head *head) 1052 { 1053 struct nfs_inode *nfsi = NFS_I(inode); 1054 struct pnfs_layout_segment *lseg, *tmp; 1055 1056 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 1057 return; 1058 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { 1059 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 1060 continue; 1061 pnfs_lseg_dec_and_remove_zero(lseg, head); 1062 } 1063 } 1064 1065 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, 1066 const nfs4_stateid *arg_stateid, 1067 const struct pnfs_layout_range *range, 1068 const nfs4_stateid *stateid) 1069 { 1070 struct inode *inode = lo->plh_inode; 1071 LIST_HEAD(freeme); 1072 1073 spin_lock(&inode->i_lock); 1074 if (!pnfs_layout_is_valid(lo) || !arg_stateid || 1075 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) 1076 goto out_unlock; 1077 if (stateid) { 1078 u32 seq = be32_to_cpu(arg_stateid->seqid); 1079 1080 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq); 1081 pnfs_free_returned_lsegs(lo, &freeme, range, seq); 1082 pnfs_set_layout_stateid(lo, stateid, true); 1083 } else 1084 pnfs_mark_layout_stateid_invalid(lo, &freeme); 1085 out_unlock: 1086 pnfs_clear_layoutreturn_waitbit(lo); 1087 spin_unlock(&inode->i_lock); 1088 pnfs_free_lseg_list(&freeme); 1089 1090 } 1091 1092 static bool 1093 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo, 1094 nfs4_stateid *stateid, 1095 enum pnfs_iomode *iomode) 1096 { 1097 /* Serialise LAYOUTGET/LAYOUTRETURN */ 1098 if (atomic_read(&lo->plh_outstanding) != 0) 1099 return false; 1100 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 1101 return false; 1102 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 1103 pnfs_get_layout_hdr(lo); 1104 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) { 1105 if (stateid != NULL) { 1106 nfs4_stateid_copy(stateid, &lo->plh_stateid); 1107 if (lo->plh_return_seq != 0) 1108 stateid->seqid = cpu_to_be32(lo->plh_return_seq); 1109 } 1110 if (iomode != NULL) 1111 *iomode = lo->plh_return_iomode; 1112 pnfs_clear_layoutreturn_info(lo); 1113 return true; 1114 } 1115 if (stateid != NULL) 1116 nfs4_stateid_copy(stateid, &lo->plh_stateid); 1117 if (iomode != NULL) 1118 *iomode = IOMODE_ANY; 1119 return true; 1120 } 1121 1122 static void 1123 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args, 1124 struct pnfs_layout_hdr *lo, 1125 const nfs4_stateid *stateid, 1126 enum pnfs_iomode iomode) 1127 { 1128 struct inode *inode = lo->plh_inode; 1129 1130 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id; 1131 args->inode = inode; 1132 args->range.iomode = iomode; 1133 args->range.offset = 0; 1134 args->range.length = NFS4_MAX_UINT64; 1135 args->layout = lo; 1136 nfs4_stateid_copy(&args->stateid, stateid); 1137 } 1138 1139 static int 1140 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid, 1141 enum pnfs_iomode iomode, bool sync) 1142 { 1143 struct inode *ino = lo->plh_inode; 1144 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1145 struct nfs4_layoutreturn *lrp; 1146 int status = 0; 1147 1148 lrp = kzalloc(sizeof(*lrp), GFP_NOFS); 1149 if (unlikely(lrp == NULL)) { 1150 status = -ENOMEM; 1151 spin_lock(&ino->i_lock); 1152 pnfs_clear_layoutreturn_waitbit(lo); 1153 spin_unlock(&ino->i_lock); 1154 pnfs_put_layout_hdr(lo); 1155 goto out; 1156 } 1157 1158 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode); 1159 lrp->args.ld_private = &lrp->ld_private; 1160 lrp->clp = NFS_SERVER(ino)->nfs_client; 1161 lrp->cred = lo->plh_lc_cred; 1162 if (ld->prepare_layoutreturn) 1163 ld->prepare_layoutreturn(&lrp->args); 1164 1165 status = nfs4_proc_layoutreturn(lrp, sync); 1166 out: 1167 dprintk("<-- %s status: %d\n", __func__, status); 1168 return status; 1169 } 1170 1171 /* Return true if layoutreturn is needed */ 1172 static bool 1173 pnfs_layout_need_return(struct pnfs_layout_hdr *lo) 1174 { 1175 struct pnfs_layout_segment *s; 1176 enum pnfs_iomode iomode; 1177 u32 seq; 1178 1179 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1180 return false; 1181 1182 seq = lo->plh_return_seq; 1183 iomode = lo->plh_return_iomode; 1184 1185 /* Defer layoutreturn until all recalled lsegs are done */ 1186 list_for_each_entry(s, &lo->plh_segs, pls_list) { 1187 if (seq && pnfs_seqid_is_newer(s->pls_seq, seq)) 1188 continue; 1189 if (iomode != IOMODE_ANY && s->pls_range.iomode != iomode) 1190 continue; 1191 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags)) 1192 return false; 1193 } 1194 1195 return true; 1196 } 1197 1198 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo) 1199 { 1200 struct inode *inode= lo->plh_inode; 1201 1202 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1203 return; 1204 spin_lock(&inode->i_lock); 1205 if (pnfs_layout_need_return(lo)) { 1206 nfs4_stateid stateid; 1207 enum pnfs_iomode iomode; 1208 bool send; 1209 1210 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode); 1211 spin_unlock(&inode->i_lock); 1212 if (send) { 1213 /* Send an async layoutreturn so we dont deadlock */ 1214 pnfs_send_layoutreturn(lo, &stateid, iomode, false); 1215 } 1216 } else 1217 spin_unlock(&inode->i_lock); 1218 } 1219 1220 /* 1221 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr 1222 * when the layout segment list is empty. 1223 * 1224 * Note that a pnfs_layout_hdr can exist with an empty layout segment 1225 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the 1226 * deviceid is marked invalid. 1227 */ 1228 int 1229 _pnfs_return_layout(struct inode *ino) 1230 { 1231 struct pnfs_layout_hdr *lo = NULL; 1232 struct nfs_inode *nfsi = NFS_I(ino); 1233 LIST_HEAD(tmp_list); 1234 nfs4_stateid stateid; 1235 int status = 0; 1236 bool send, valid_layout; 1237 1238 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); 1239 1240 spin_lock(&ino->i_lock); 1241 lo = nfsi->layout; 1242 if (!lo) { 1243 spin_unlock(&ino->i_lock); 1244 dprintk("NFS: %s no layout to return\n", __func__); 1245 goto out; 1246 } 1247 /* Reference matched in nfs4_layoutreturn_release */ 1248 pnfs_get_layout_hdr(lo); 1249 /* Is there an outstanding layoutreturn ? */ 1250 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1251 spin_unlock(&ino->i_lock); 1252 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1253 TASK_UNINTERRUPTIBLE)) 1254 goto out_put_layout_hdr; 1255 spin_lock(&ino->i_lock); 1256 } 1257 valid_layout = pnfs_layout_is_valid(lo); 1258 pnfs_clear_layoutcommit(ino, &tmp_list); 1259 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0); 1260 1261 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 1262 struct pnfs_layout_range range = { 1263 .iomode = IOMODE_ANY, 1264 .offset = 0, 1265 .length = NFS4_MAX_UINT64, 1266 }; 1267 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); 1268 } 1269 1270 /* Don't send a LAYOUTRETURN if list was initially empty */ 1271 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) || 1272 !valid_layout) { 1273 spin_unlock(&ino->i_lock); 1274 dprintk("NFS: %s no layout segments to return\n", __func__); 1275 goto out_put_layout_hdr; 1276 } 1277 1278 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL); 1279 spin_unlock(&ino->i_lock); 1280 if (send) 1281 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true); 1282 out_put_layout_hdr: 1283 pnfs_free_lseg_list(&tmp_list); 1284 pnfs_put_layout_hdr(lo); 1285 out: 1286 dprintk("<-- %s status: %d\n", __func__, status); 1287 return status; 1288 } 1289 1290 int 1291 pnfs_commit_and_return_layout(struct inode *inode) 1292 { 1293 struct pnfs_layout_hdr *lo; 1294 int ret; 1295 1296 spin_lock(&inode->i_lock); 1297 lo = NFS_I(inode)->layout; 1298 if (lo == NULL) { 1299 spin_unlock(&inode->i_lock); 1300 return 0; 1301 } 1302 pnfs_get_layout_hdr(lo); 1303 /* Block new layoutgets and read/write to ds */ 1304 lo->plh_block_lgets++; 1305 spin_unlock(&inode->i_lock); 1306 filemap_fdatawait(inode->i_mapping); 1307 ret = pnfs_layoutcommit_inode(inode, true); 1308 if (ret == 0) 1309 ret = _pnfs_return_layout(inode); 1310 spin_lock(&inode->i_lock); 1311 lo->plh_block_lgets--; 1312 spin_unlock(&inode->i_lock); 1313 pnfs_put_layout_hdr(lo); 1314 return ret; 1315 } 1316 1317 bool pnfs_roc(struct inode *ino, 1318 struct nfs4_layoutreturn_args *args, 1319 struct nfs4_layoutreturn_res *res, 1320 const struct rpc_cred *cred) 1321 { 1322 struct nfs_inode *nfsi = NFS_I(ino); 1323 struct nfs_open_context *ctx; 1324 struct nfs4_state *state; 1325 struct pnfs_layout_hdr *lo; 1326 struct pnfs_layout_segment *lseg, *next; 1327 nfs4_stateid stateid; 1328 enum pnfs_iomode iomode = 0; 1329 bool layoutreturn = false, roc = false; 1330 bool skip_read = false; 1331 1332 if (!nfs_have_layout(ino)) 1333 return false; 1334 retry: 1335 spin_lock(&ino->i_lock); 1336 lo = nfsi->layout; 1337 if (!lo || !pnfs_layout_is_valid(lo) || 1338 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1339 lo = NULL; 1340 goto out_noroc; 1341 } 1342 pnfs_get_layout_hdr(lo); 1343 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1344 spin_unlock(&ino->i_lock); 1345 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1346 TASK_UNINTERRUPTIBLE); 1347 pnfs_put_layout_hdr(lo); 1348 goto retry; 1349 } 1350 1351 /* no roc if we hold a delegation */ 1352 if (nfs4_check_delegation(ino, FMODE_READ)) { 1353 if (nfs4_check_delegation(ino, FMODE_WRITE)) 1354 goto out_noroc; 1355 skip_read = true; 1356 } 1357 1358 list_for_each_entry(ctx, &nfsi->open_files, list) { 1359 state = ctx->state; 1360 if (state == NULL) 1361 continue; 1362 /* Don't return layout if there is open file state */ 1363 if (state->state & FMODE_WRITE) 1364 goto out_noroc; 1365 if (state->state & FMODE_READ) 1366 skip_read = true; 1367 } 1368 1369 1370 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) { 1371 if (skip_read && lseg->pls_range.iomode == IOMODE_READ) 1372 continue; 1373 /* If we are sending layoutreturn, invalidate all valid lsegs */ 1374 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags)) 1375 continue; 1376 /* 1377 * Note: mark lseg for return so pnfs_layout_remove_lseg 1378 * doesn't invalidate the layout for us. 1379 */ 1380 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 1381 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs)) 1382 continue; 1383 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 1384 } 1385 1386 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1387 goto out_noroc; 1388 1389 /* ROC in two conditions: 1390 * 1. there are ROC lsegs 1391 * 2. we don't send layoutreturn 1392 */ 1393 /* lo ref dropped in pnfs_roc_release() */ 1394 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode); 1395 /* If the creds don't match, we can't compound the layoutreturn */ 1396 if (!layoutreturn || cred != lo->plh_lc_cred) 1397 goto out_noroc; 1398 1399 roc = layoutreturn; 1400 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode); 1401 res->lrs_present = 0; 1402 layoutreturn = false; 1403 1404 out_noroc: 1405 spin_unlock(&ino->i_lock); 1406 pnfs_layoutcommit_inode(ino, true); 1407 if (roc) { 1408 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1409 if (ld->prepare_layoutreturn) 1410 ld->prepare_layoutreturn(args); 1411 pnfs_put_layout_hdr(lo); 1412 return true; 1413 } 1414 if (layoutreturn) 1415 pnfs_send_layoutreturn(lo, &stateid, iomode, true); 1416 pnfs_put_layout_hdr(lo); 1417 return false; 1418 } 1419 1420 void pnfs_roc_release(struct nfs4_layoutreturn_args *args, 1421 struct nfs4_layoutreturn_res *res, 1422 int ret) 1423 { 1424 struct pnfs_layout_hdr *lo = args->layout; 1425 const nfs4_stateid *arg_stateid = NULL; 1426 const nfs4_stateid *res_stateid = NULL; 1427 struct nfs4_xdr_opaque_data *ld_private = args->ld_private; 1428 1429 if (ret == 0) { 1430 arg_stateid = &args->stateid; 1431 if (res->lrs_present) 1432 res_stateid = &res->stateid; 1433 } 1434 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range, 1435 res_stateid); 1436 if (ld_private && ld_private->ops && ld_private->ops->free) 1437 ld_private->ops->free(ld_private); 1438 pnfs_put_layout_hdr(lo); 1439 trace_nfs4_layoutreturn_on_close(args->inode, 0); 1440 } 1441 1442 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) 1443 { 1444 struct nfs_inode *nfsi = NFS_I(ino); 1445 struct pnfs_layout_hdr *lo; 1446 bool sleep = false; 1447 1448 /* we might not have grabbed lo reference. so need to check under 1449 * i_lock */ 1450 spin_lock(&ino->i_lock); 1451 lo = nfsi->layout; 1452 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1453 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1454 sleep = true; 1455 } 1456 spin_unlock(&ino->i_lock); 1457 return sleep; 1458 } 1459 1460 /* 1461 * Compare two layout segments for sorting into layout cache. 1462 * We want to preferentially return RW over RO layouts, so ensure those 1463 * are seen first. 1464 */ 1465 static s64 1466 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, 1467 const struct pnfs_layout_range *l2) 1468 { 1469 s64 d; 1470 1471 /* high offset > low offset */ 1472 d = l1->offset - l2->offset; 1473 if (d) 1474 return d; 1475 1476 /* short length > long length */ 1477 d = l2->length - l1->length; 1478 if (d) 1479 return d; 1480 1481 /* read > read/write */ 1482 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); 1483 } 1484 1485 static bool 1486 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1, 1487 const struct pnfs_layout_range *l2) 1488 { 1489 return pnfs_lseg_range_cmp(l1, l2) > 0; 1490 } 1491 1492 static bool 1493 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg, 1494 struct pnfs_layout_segment *old) 1495 { 1496 return false; 1497 } 1498 1499 void 1500 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1501 struct pnfs_layout_segment *lseg, 1502 bool (*is_after)(const struct pnfs_layout_range *, 1503 const struct pnfs_layout_range *), 1504 bool (*do_merge)(struct pnfs_layout_segment *, 1505 struct pnfs_layout_segment *), 1506 struct list_head *free_me) 1507 { 1508 struct pnfs_layout_segment *lp, *tmp; 1509 1510 dprintk("%s:Begin\n", __func__); 1511 1512 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) { 1513 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0) 1514 continue; 1515 if (do_merge(lseg, lp)) { 1516 mark_lseg_invalid(lp, free_me); 1517 continue; 1518 } 1519 if (is_after(&lseg->pls_range, &lp->pls_range)) 1520 continue; 1521 list_add_tail(&lseg->pls_list, &lp->pls_list); 1522 dprintk("%s: inserted lseg %p " 1523 "iomode %d offset %llu length %llu before " 1524 "lp %p iomode %d offset %llu length %llu\n", 1525 __func__, lseg, lseg->pls_range.iomode, 1526 lseg->pls_range.offset, lseg->pls_range.length, 1527 lp, lp->pls_range.iomode, lp->pls_range.offset, 1528 lp->pls_range.length); 1529 goto out; 1530 } 1531 list_add_tail(&lseg->pls_list, &lo->plh_segs); 1532 dprintk("%s: inserted lseg %p " 1533 "iomode %d offset %llu length %llu at tail\n", 1534 __func__, lseg, lseg->pls_range.iomode, 1535 lseg->pls_range.offset, lseg->pls_range.length); 1536 out: 1537 pnfs_get_layout_hdr(lo); 1538 1539 dprintk("%s:Return\n", __func__); 1540 } 1541 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg); 1542 1543 static void 1544 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1545 struct pnfs_layout_segment *lseg, 1546 struct list_head *free_me) 1547 { 1548 struct inode *inode = lo->plh_inode; 1549 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 1550 1551 if (ld->add_lseg != NULL) 1552 ld->add_lseg(lo, lseg, free_me); 1553 else 1554 pnfs_generic_layout_insert_lseg(lo, lseg, 1555 pnfs_lseg_range_is_after, 1556 pnfs_lseg_no_merge, 1557 free_me); 1558 } 1559 1560 static struct pnfs_layout_hdr * 1561 alloc_init_layout_hdr(struct inode *ino, 1562 struct nfs_open_context *ctx, 1563 gfp_t gfp_flags) 1564 { 1565 struct pnfs_layout_hdr *lo; 1566 1567 lo = pnfs_alloc_layout_hdr(ino, gfp_flags); 1568 if (!lo) 1569 return NULL; 1570 refcount_set(&lo->plh_refcount, 1); 1571 INIT_LIST_HEAD(&lo->plh_layouts); 1572 INIT_LIST_HEAD(&lo->plh_segs); 1573 INIT_LIST_HEAD(&lo->plh_return_segs); 1574 INIT_LIST_HEAD(&lo->plh_bulk_destroy); 1575 lo->plh_inode = ino; 1576 lo->plh_lc_cred = get_rpccred(ctx->cred); 1577 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID; 1578 return lo; 1579 } 1580 1581 static struct pnfs_layout_hdr * 1582 pnfs_find_alloc_layout(struct inode *ino, 1583 struct nfs_open_context *ctx, 1584 gfp_t gfp_flags) 1585 __releases(&ino->i_lock) 1586 __acquires(&ino->i_lock) 1587 { 1588 struct nfs_inode *nfsi = NFS_I(ino); 1589 struct pnfs_layout_hdr *new = NULL; 1590 1591 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); 1592 1593 if (nfsi->layout != NULL) 1594 goto out_existing; 1595 spin_unlock(&ino->i_lock); 1596 new = alloc_init_layout_hdr(ino, ctx, gfp_flags); 1597 spin_lock(&ino->i_lock); 1598 1599 if (likely(nfsi->layout == NULL)) { /* Won the race? */ 1600 nfsi->layout = new; 1601 return new; 1602 } else if (new != NULL) 1603 pnfs_free_layout_hdr(new); 1604 out_existing: 1605 pnfs_get_layout_hdr(nfsi->layout); 1606 return nfsi->layout; 1607 } 1608 1609 /* 1610 * iomode matching rules: 1611 * iomode lseg strict match 1612 * iomode 1613 * ----- ----- ------ ----- 1614 * ANY READ N/A true 1615 * ANY RW N/A true 1616 * RW READ N/A false 1617 * RW RW N/A true 1618 * READ READ N/A true 1619 * READ RW true false 1620 * READ RW false true 1621 */ 1622 static bool 1623 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, 1624 const struct pnfs_layout_range *range, 1625 bool strict_iomode) 1626 { 1627 struct pnfs_layout_range range1; 1628 1629 if ((range->iomode == IOMODE_RW && 1630 ls_range->iomode != IOMODE_RW) || 1631 (range->iomode != ls_range->iomode && 1632 strict_iomode) || 1633 !pnfs_lseg_range_intersecting(ls_range, range)) 1634 return false; 1635 1636 /* range1 covers only the first byte in the range */ 1637 range1 = *range; 1638 range1.length = 1; 1639 return pnfs_lseg_range_contained(ls_range, &range1); 1640 } 1641 1642 /* 1643 * lookup range in layout 1644 */ 1645 static struct pnfs_layout_segment * 1646 pnfs_find_lseg(struct pnfs_layout_hdr *lo, 1647 struct pnfs_layout_range *range, 1648 bool strict_iomode) 1649 { 1650 struct pnfs_layout_segment *lseg, *ret = NULL; 1651 1652 dprintk("%s:Begin\n", __func__); 1653 1654 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 1655 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && 1656 pnfs_lseg_range_match(&lseg->pls_range, range, 1657 strict_iomode)) { 1658 ret = pnfs_get_lseg(lseg); 1659 break; 1660 } 1661 } 1662 1663 dprintk("%s:Return lseg %p ref %d\n", 1664 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0); 1665 return ret; 1666 } 1667 1668 /* 1669 * Use mdsthreshold hints set at each OPEN to determine if I/O should go 1670 * to the MDS or over pNFS 1671 * 1672 * The nfs_inode read_io and write_io fields are cumulative counters reset 1673 * when there are no layout segments. Note that in pnfs_update_layout iomode 1674 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a 1675 * WRITE request. 1676 * 1677 * A return of true means use MDS I/O. 1678 * 1679 * From rfc 5661: 1680 * If a file's size is smaller than the file size threshold, data accesses 1681 * SHOULD be sent to the metadata server. If an I/O request has a length that 1682 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata 1683 * server. If both file size and I/O size are provided, the client SHOULD 1684 * reach or exceed both thresholds before sending its read or write 1685 * requests to the data server. 1686 */ 1687 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, 1688 struct inode *ino, int iomode) 1689 { 1690 struct nfs4_threshold *t = ctx->mdsthreshold; 1691 struct nfs_inode *nfsi = NFS_I(ino); 1692 loff_t fsize = i_size_read(ino); 1693 bool size = false, size_set = false, io = false, io_set = false, ret = false; 1694 1695 if (t == NULL) 1696 return ret; 1697 1698 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", 1699 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); 1700 1701 switch (iomode) { 1702 case IOMODE_READ: 1703 if (t->bm & THRESHOLD_RD) { 1704 dprintk("%s fsize %llu\n", __func__, fsize); 1705 size_set = true; 1706 if (fsize < t->rd_sz) 1707 size = true; 1708 } 1709 if (t->bm & THRESHOLD_RD_IO) { 1710 dprintk("%s nfsi->read_io %llu\n", __func__, 1711 nfsi->read_io); 1712 io_set = true; 1713 if (nfsi->read_io < t->rd_io_sz) 1714 io = true; 1715 } 1716 break; 1717 case IOMODE_RW: 1718 if (t->bm & THRESHOLD_WR) { 1719 dprintk("%s fsize %llu\n", __func__, fsize); 1720 size_set = true; 1721 if (fsize < t->wr_sz) 1722 size = true; 1723 } 1724 if (t->bm & THRESHOLD_WR_IO) { 1725 dprintk("%s nfsi->write_io %llu\n", __func__, 1726 nfsi->write_io); 1727 io_set = true; 1728 if (nfsi->write_io < t->wr_io_sz) 1729 io = true; 1730 } 1731 break; 1732 } 1733 if (size_set && io_set) { 1734 if (size && io) 1735 ret = true; 1736 } else if (size || io) 1737 ret = true; 1738 1739 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); 1740 return ret; 1741 } 1742 1743 static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) 1744 { 1745 /* 1746 * send layoutcommit as it can hold up layoutreturn due to lseg 1747 * reference 1748 */ 1749 pnfs_layoutcommit_inode(lo->plh_inode, false); 1750 return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, 1751 nfs_wait_bit_killable, 1752 TASK_UNINTERRUPTIBLE); 1753 } 1754 1755 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo) 1756 { 1757 atomic_inc(&lo->plh_outstanding); 1758 } 1759 1760 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo) 1761 { 1762 if (atomic_dec_and_test(&lo->plh_outstanding)) 1763 wake_up_var(&lo->plh_outstanding); 1764 } 1765 1766 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) 1767 { 1768 unsigned long *bitlock = &lo->plh_flags; 1769 1770 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); 1771 smp_mb__after_atomic(); 1772 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); 1773 } 1774 1775 static void _add_to_server_list(struct pnfs_layout_hdr *lo, 1776 struct nfs_server *server) 1777 { 1778 if (list_empty(&lo->plh_layouts)) { 1779 struct nfs_client *clp = server->nfs_client; 1780 1781 /* The lo must be on the clp list if there is any 1782 * chance of a CB_LAYOUTRECALL(FILE) coming in. 1783 */ 1784 spin_lock(&clp->cl_lock); 1785 if (list_empty(&lo->plh_layouts)) 1786 list_add_tail(&lo->plh_layouts, &server->layouts); 1787 spin_unlock(&clp->cl_lock); 1788 } 1789 } 1790 1791 /* 1792 * Layout segment is retreived from the server if not cached. 1793 * The appropriate layout segment is referenced and returned to the caller. 1794 */ 1795 struct pnfs_layout_segment * 1796 pnfs_update_layout(struct inode *ino, 1797 struct nfs_open_context *ctx, 1798 loff_t pos, 1799 u64 count, 1800 enum pnfs_iomode iomode, 1801 bool strict_iomode, 1802 gfp_t gfp_flags) 1803 { 1804 struct pnfs_layout_range arg = { 1805 .iomode = iomode, 1806 .offset = pos, 1807 .length = count, 1808 }; 1809 unsigned pg_offset; 1810 struct nfs_server *server = NFS_SERVER(ino); 1811 struct nfs_client *clp = server->nfs_client; 1812 struct pnfs_layout_hdr *lo = NULL; 1813 struct pnfs_layout_segment *lseg = NULL; 1814 struct nfs4_layoutget *lgp; 1815 nfs4_stateid stateid; 1816 long timeout = 0; 1817 unsigned long giveup = jiffies + (clp->cl_lease_time << 1); 1818 bool first; 1819 1820 if (!pnfs_enabled_sb(NFS_SERVER(ino))) { 1821 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1822 PNFS_UPDATE_LAYOUT_NO_PNFS); 1823 goto out; 1824 } 1825 1826 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) { 1827 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1828 PNFS_UPDATE_LAYOUT_MDSTHRESH); 1829 goto out; 1830 } 1831 1832 lookup_again: 1833 nfs4_client_recover_expired_lease(clp); 1834 first = false; 1835 spin_lock(&ino->i_lock); 1836 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); 1837 if (lo == NULL) { 1838 spin_unlock(&ino->i_lock); 1839 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1840 PNFS_UPDATE_LAYOUT_NOMEM); 1841 goto out; 1842 } 1843 1844 /* Do we even need to bother with this? */ 1845 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1846 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1847 PNFS_UPDATE_LAYOUT_BULK_RECALL); 1848 dprintk("%s matches recall, use MDS\n", __func__); 1849 goto out_unlock; 1850 } 1851 1852 /* if LAYOUTGET already failed once we don't try again */ 1853 if (pnfs_layout_io_test_failed(lo, iomode)) { 1854 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1855 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); 1856 goto out_unlock; 1857 } 1858 1859 /* 1860 * If the layout segment list is empty, but there are outstanding 1861 * layoutget calls, then they might be subject to a layoutrecall. 1862 */ 1863 if (list_empty(&lo->plh_segs) && 1864 atomic_read(&lo->plh_outstanding) != 0) { 1865 spin_unlock(&ino->i_lock); 1866 if (wait_var_event_killable(&lo->plh_outstanding, 1867 atomic_read(&lo->plh_outstanding) == 0 1868 || !list_empty(&lo->plh_segs))) 1869 goto out_put_layout_hdr; 1870 pnfs_put_layout_hdr(lo); 1871 goto lookup_again; 1872 } 1873 1874 lseg = pnfs_find_lseg(lo, &arg, strict_iomode); 1875 if (lseg) { 1876 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1877 PNFS_UPDATE_LAYOUT_FOUND_CACHED); 1878 goto out_unlock; 1879 } 1880 1881 if (!nfs4_valid_open_stateid(ctx->state)) { 1882 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1883 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 1884 goto out_unlock; 1885 } 1886 1887 /* 1888 * Choose a stateid for the LAYOUTGET. If we don't have a layout 1889 * stateid, or it has been invalidated, then we must use the open 1890 * stateid. 1891 */ 1892 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { 1893 1894 /* 1895 * The first layoutget for the file. Need to serialize per 1896 * RFC 5661 Errata 3208. 1897 */ 1898 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, 1899 &lo->plh_flags)) { 1900 spin_unlock(&ino->i_lock); 1901 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_FIRST_LAYOUTGET, 1902 TASK_UNINTERRUPTIBLE); 1903 pnfs_put_layout_hdr(lo); 1904 dprintk("%s retrying\n", __func__); 1905 goto lookup_again; 1906 } 1907 1908 first = true; 1909 if (nfs4_select_rw_stateid(ctx->state, 1910 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ, 1911 NULL, &stateid, NULL) != 0) { 1912 trace_pnfs_update_layout(ino, pos, count, 1913 iomode, lo, lseg, 1914 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 1915 goto out_unlock; 1916 } 1917 } else { 1918 nfs4_stateid_copy(&stateid, &lo->plh_stateid); 1919 } 1920 1921 /* 1922 * Because we free lsegs before sending LAYOUTRETURN, we need to wait 1923 * for LAYOUTRETURN even if first is true. 1924 */ 1925 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1926 spin_unlock(&ino->i_lock); 1927 dprintk("%s wait for layoutreturn\n", __func__); 1928 if (pnfs_prepare_to_retry_layoutget(lo)) { 1929 if (first) 1930 pnfs_clear_first_layoutget(lo); 1931 pnfs_put_layout_hdr(lo); 1932 dprintk("%s retrying\n", __func__); 1933 trace_pnfs_update_layout(ino, pos, count, iomode, lo, 1934 lseg, PNFS_UPDATE_LAYOUT_RETRY); 1935 goto lookup_again; 1936 } 1937 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1938 PNFS_UPDATE_LAYOUT_RETURN); 1939 goto out_put_layout_hdr; 1940 } 1941 1942 if (pnfs_layoutgets_blocked(lo)) { 1943 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1944 PNFS_UPDATE_LAYOUT_BLOCKED); 1945 goto out_unlock; 1946 } 1947 nfs_layoutget_begin(lo); 1948 spin_unlock(&ino->i_lock); 1949 1950 _add_to_server_list(lo, server); 1951 1952 pg_offset = arg.offset & ~PAGE_MASK; 1953 if (pg_offset) { 1954 arg.offset -= pg_offset; 1955 arg.length += pg_offset; 1956 } 1957 if (arg.length != NFS4_MAX_UINT64) 1958 arg.length = PAGE_ALIGN(arg.length); 1959 1960 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags); 1961 if (!lgp) { 1962 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL, 1963 PNFS_UPDATE_LAYOUT_NOMEM); 1964 nfs_layoutget_end(lo); 1965 goto out_put_layout_hdr; 1966 } 1967 1968 lseg = nfs4_proc_layoutget(lgp, &timeout); 1969 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1970 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); 1971 nfs_layoutget_end(lo); 1972 if (IS_ERR(lseg)) { 1973 switch(PTR_ERR(lseg)) { 1974 case -EBUSY: 1975 if (time_after(jiffies, giveup)) 1976 lseg = NULL; 1977 break; 1978 case -ERECALLCONFLICT: 1979 case -EAGAIN: 1980 break; 1981 default: 1982 if (!nfs_error_is_fatal(PTR_ERR(lseg))) { 1983 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 1984 lseg = NULL; 1985 } 1986 goto out_put_layout_hdr; 1987 } 1988 if (lseg) { 1989 if (first) 1990 pnfs_clear_first_layoutget(lo); 1991 trace_pnfs_update_layout(ino, pos, count, 1992 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); 1993 pnfs_put_layout_hdr(lo); 1994 goto lookup_again; 1995 } 1996 } else { 1997 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 1998 } 1999 2000 out_put_layout_hdr: 2001 if (first) 2002 pnfs_clear_first_layoutget(lo); 2003 pnfs_put_layout_hdr(lo); 2004 out: 2005 dprintk("%s: inode %s/%llu pNFS layout segment %s for " 2006 "(%s, offset: %llu, length: %llu)\n", 2007 __func__, ino->i_sb->s_id, 2008 (unsigned long long)NFS_FILEID(ino), 2009 IS_ERR_OR_NULL(lseg) ? "not found" : "found", 2010 iomode==IOMODE_RW ? "read/write" : "read-only", 2011 (unsigned long long)pos, 2012 (unsigned long long)count); 2013 return lseg; 2014 out_unlock: 2015 spin_unlock(&ino->i_lock); 2016 goto out_put_layout_hdr; 2017 } 2018 EXPORT_SYMBOL_GPL(pnfs_update_layout); 2019 2020 static bool 2021 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) 2022 { 2023 switch (range->iomode) { 2024 case IOMODE_READ: 2025 case IOMODE_RW: 2026 break; 2027 default: 2028 return false; 2029 } 2030 if (range->offset == NFS4_MAX_UINT64) 2031 return false; 2032 if (range->length == 0) 2033 return false; 2034 if (range->length != NFS4_MAX_UINT64 && 2035 range->length > NFS4_MAX_UINT64 - range->offset) 2036 return false; 2037 return true; 2038 } 2039 2040 static struct pnfs_layout_hdr * 2041 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx) 2042 { 2043 struct pnfs_layout_hdr *lo; 2044 2045 spin_lock(&ino->i_lock); 2046 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL); 2047 if (!lo) 2048 goto out_unlock; 2049 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) 2050 goto out_unlock; 2051 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) 2052 goto out_unlock; 2053 if (pnfs_layoutgets_blocked(lo)) 2054 goto out_unlock; 2055 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) 2056 goto out_unlock; 2057 nfs_layoutget_begin(lo); 2058 spin_unlock(&ino->i_lock); 2059 _add_to_server_list(lo, NFS_SERVER(ino)); 2060 return lo; 2061 2062 out_unlock: 2063 spin_unlock(&ino->i_lock); 2064 pnfs_put_layout_hdr(lo); 2065 return NULL; 2066 } 2067 2068 extern const nfs4_stateid current_stateid; 2069 2070 static void _lgopen_prepare_attached(struct nfs4_opendata *data, 2071 struct nfs_open_context *ctx) 2072 { 2073 struct inode *ino = data->dentry->d_inode; 2074 struct pnfs_layout_range rng = { 2075 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2076 IOMODE_RW: IOMODE_READ, 2077 .offset = 0, 2078 .length = NFS4_MAX_UINT64, 2079 }; 2080 struct nfs4_layoutget *lgp; 2081 struct pnfs_layout_hdr *lo; 2082 2083 /* Heuristic: don't send layoutget if we have cached data */ 2084 if (rng.iomode == IOMODE_READ && 2085 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0)) 2086 return; 2087 2088 lo = _pnfs_grab_empty_layout(ino, ctx); 2089 if (!lo) 2090 return; 2091 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, 2092 &rng, GFP_KERNEL); 2093 if (!lgp) { 2094 pnfs_clear_first_layoutget(lo); 2095 pnfs_put_layout_hdr(lo); 2096 return; 2097 } 2098 data->lgp = lgp; 2099 data->o_arg.lg_args = &lgp->args; 2100 data->o_res.lg_res = &lgp->res; 2101 } 2102 2103 static void _lgopen_prepare_floating(struct nfs4_opendata *data, 2104 struct nfs_open_context *ctx) 2105 { 2106 struct pnfs_layout_range rng = { 2107 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2108 IOMODE_RW: IOMODE_READ, 2109 .offset = 0, 2110 .length = NFS4_MAX_UINT64, 2111 }; 2112 struct nfs4_layoutget *lgp; 2113 2114 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid, 2115 &rng, GFP_KERNEL); 2116 if (!lgp) 2117 return; 2118 data->lgp = lgp; 2119 data->o_arg.lg_args = &lgp->args; 2120 data->o_res.lg_res = &lgp->res; 2121 } 2122 2123 void pnfs_lgopen_prepare(struct nfs4_opendata *data, 2124 struct nfs_open_context *ctx) 2125 { 2126 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 2127 2128 if (!(pnfs_enabled_sb(server) && 2129 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN)) 2130 return; 2131 /* Could check on max_ops, but currently hardcoded high enough */ 2132 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN)) 2133 return; 2134 if (data->state) 2135 _lgopen_prepare_attached(data, ctx); 2136 else 2137 _lgopen_prepare_floating(data, ctx); 2138 } 2139 2140 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp, 2141 struct nfs_open_context *ctx) 2142 { 2143 struct pnfs_layout_hdr *lo; 2144 struct pnfs_layout_segment *lseg; 2145 struct nfs_server *srv = NFS_SERVER(ino); 2146 u32 iomode; 2147 2148 if (!lgp) 2149 return; 2150 dprintk("%s: entered with status %i\n", __func__, lgp->res.status); 2151 if (lgp->res.status) { 2152 switch (lgp->res.status) { 2153 default: 2154 break; 2155 /* 2156 * Halt lgopen attempts if the server doesn't recognise 2157 * the "current stateid" value, the layout type, or the 2158 * layoutget operation as being valid. 2159 * Also if it complains about too many ops in the compound 2160 * or of the request/reply being too big. 2161 */ 2162 case -NFS4ERR_BAD_STATEID: 2163 case -NFS4ERR_NOTSUPP: 2164 case -NFS4ERR_REP_TOO_BIG: 2165 case -NFS4ERR_REP_TOO_BIG_TO_CACHE: 2166 case -NFS4ERR_REQ_TOO_BIG: 2167 case -NFS4ERR_TOO_MANY_OPS: 2168 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 2169 srv->caps &= ~NFS_CAP_LGOPEN; 2170 } 2171 return; 2172 } 2173 if (!lgp->args.inode) { 2174 lo = _pnfs_grab_empty_layout(ino, ctx); 2175 if (!lo) 2176 return; 2177 lgp->args.inode = ino; 2178 } else 2179 lo = NFS_I(lgp->args.inode)->layout; 2180 2181 lseg = pnfs_layout_process(lgp); 2182 if (!IS_ERR(lseg)) { 2183 iomode = lgp->args.range.iomode; 2184 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2185 pnfs_put_lseg(lseg); 2186 } 2187 } 2188 2189 void nfs4_lgopen_release(struct nfs4_layoutget *lgp) 2190 { 2191 if (lgp != NULL) { 2192 struct inode *inode = lgp->args.inode; 2193 if (inode) { 2194 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; 2195 pnfs_clear_first_layoutget(lo); 2196 nfs_layoutget_end(lo); 2197 } 2198 pnfs_layoutget_free(lgp); 2199 } 2200 } 2201 2202 struct pnfs_layout_segment * 2203 pnfs_layout_process(struct nfs4_layoutget *lgp) 2204 { 2205 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; 2206 struct nfs4_layoutget_res *res = &lgp->res; 2207 struct pnfs_layout_segment *lseg; 2208 struct inode *ino = lo->plh_inode; 2209 LIST_HEAD(free_me); 2210 2211 if (!pnfs_sanity_check_layout_range(&res->range)) 2212 return ERR_PTR(-EINVAL); 2213 2214 /* Inject layout blob into I/O device driver */ 2215 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); 2216 if (IS_ERR_OR_NULL(lseg)) { 2217 if (!lseg) 2218 lseg = ERR_PTR(-ENOMEM); 2219 2220 dprintk("%s: Could not allocate layout: error %ld\n", 2221 __func__, PTR_ERR(lseg)); 2222 return lseg; 2223 } 2224 2225 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid); 2226 2227 spin_lock(&ino->i_lock); 2228 if (pnfs_layoutgets_blocked(lo)) { 2229 dprintk("%s forget reply due to state\n", __func__); 2230 goto out_forget; 2231 } 2232 2233 if (!pnfs_layout_is_valid(lo)) { 2234 /* We have a completely new layout */ 2235 pnfs_set_layout_stateid(lo, &res->stateid, true); 2236 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { 2237 /* existing state ID, make sure the sequence number matches. */ 2238 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { 2239 dprintk("%s forget reply due to sequence\n", __func__); 2240 goto out_forget; 2241 } 2242 pnfs_set_layout_stateid(lo, &res->stateid, false); 2243 } else { 2244 /* 2245 * We got an entirely new state ID. Mark all segments for the 2246 * inode invalid, and retry the layoutget 2247 */ 2248 pnfs_mark_layout_stateid_invalid(lo, &free_me); 2249 goto out_forget; 2250 } 2251 2252 pnfs_get_lseg(lseg); 2253 pnfs_layout_insert_lseg(lo, lseg, &free_me); 2254 2255 2256 if (res->return_on_close) 2257 set_bit(NFS_LSEG_ROC, &lseg->pls_flags); 2258 2259 spin_unlock(&ino->i_lock); 2260 pnfs_free_lseg_list(&free_me); 2261 return lseg; 2262 2263 out_forget: 2264 spin_unlock(&ino->i_lock); 2265 lseg->pls_layout = lo; 2266 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 2267 return ERR_PTR(-EAGAIN); 2268 } 2269 2270 static int 2271 mark_lseg_invalid_or_return(struct pnfs_layout_segment *lseg, 2272 struct list_head *tmp_list) 2273 { 2274 if (!mark_lseg_invalid(lseg, tmp_list)) 2275 return 0; 2276 pnfs_cache_lseg_for_layoutreturn(lseg->pls_layout, lseg); 2277 return 1; 2278 } 2279 2280 /** 2281 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments 2282 * @lo: pointer to layout header 2283 * @tmp_list: list header to be used with pnfs_free_lseg_list() 2284 * @return_range: describe layout segment ranges to be returned 2285 * @seq: stateid seqid to match 2286 * 2287 * This function is mainly intended for use by layoutrecall. It attempts 2288 * to free the layout segment immediately, or else to mark it for return 2289 * as soon as its reference count drops to zero. 2290 * 2291 * Returns 2292 * - 0: a layoutreturn needs to be scheduled. 2293 * - EBUSY: there are layout segment that are still in use. 2294 * - ENOENT: there are no layout segments that need to be returned. 2295 */ 2296 int 2297 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 2298 struct list_head *tmp_list, 2299 const struct pnfs_layout_range *return_range, 2300 u32 seq) 2301 { 2302 struct pnfs_layout_segment *lseg, *next; 2303 int remaining = 0; 2304 2305 dprintk("%s:Begin lo %p\n", __func__, lo); 2306 2307 assert_spin_locked(&lo->plh_inode->i_lock); 2308 2309 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 2310 if (pnfs_match_lseg_recall(lseg, return_range, seq)) { 2311 dprintk("%s: marking lseg %p iomode %d " 2312 "offset %llu length %llu\n", __func__, 2313 lseg, lseg->pls_range.iomode, 2314 lseg->pls_range.offset, 2315 lseg->pls_range.length); 2316 if (mark_lseg_invalid_or_return(lseg, tmp_list)) 2317 continue; 2318 remaining++; 2319 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 2320 } 2321 2322 if (remaining) { 2323 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2324 return -EBUSY; 2325 } 2326 2327 if (!list_empty(&lo->plh_return_segs)) { 2328 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2329 return 0; 2330 } 2331 2332 return -ENOENT; 2333 } 2334 2335 void pnfs_error_mark_layout_for_return(struct inode *inode, 2336 struct pnfs_layout_segment *lseg) 2337 { 2338 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; 2339 struct pnfs_layout_range range = { 2340 .iomode = lseg->pls_range.iomode, 2341 .offset = 0, 2342 .length = NFS4_MAX_UINT64, 2343 }; 2344 bool return_now = false; 2345 2346 spin_lock(&inode->i_lock); 2347 if (!pnfs_layout_is_valid(lo)) { 2348 spin_unlock(&inode->i_lock); 2349 return; 2350 } 2351 pnfs_set_plh_return_info(lo, range.iomode, 0); 2352 /* 2353 * mark all matching lsegs so that we are sure to have no live 2354 * segments at hand when sending layoutreturn. See pnfs_put_lseg() 2355 * for how it works. 2356 */ 2357 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0) != -EBUSY) { 2358 nfs4_stateid stateid; 2359 enum pnfs_iomode iomode; 2360 2361 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode); 2362 spin_unlock(&inode->i_lock); 2363 if (return_now) 2364 pnfs_send_layoutreturn(lo, &stateid, iomode, false); 2365 } else { 2366 spin_unlock(&inode->i_lock); 2367 nfs_commit_inode(inode, 0); 2368 } 2369 } 2370 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); 2371 2372 void 2373 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio) 2374 { 2375 if (pgio->pg_lseg == NULL || 2376 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags)) 2377 return; 2378 pnfs_put_lseg(pgio->pg_lseg); 2379 pgio->pg_lseg = NULL; 2380 } 2381 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); 2382 2383 /* 2384 * Check for any intersection between the request and the pgio->pg_lseg, 2385 * and if none, put this pgio->pg_lseg away. 2386 */ 2387 static void 2388 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2389 { 2390 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) { 2391 pnfs_put_lseg(pgio->pg_lseg); 2392 pgio->pg_lseg = NULL; 2393 } 2394 } 2395 2396 void 2397 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2398 { 2399 u64 rd_size = req->wb_bytes; 2400 2401 pnfs_generic_pg_check_layout(pgio); 2402 pnfs_generic_pg_check_range(pgio, req); 2403 if (pgio->pg_lseg == NULL) { 2404 if (pgio->pg_dreq == NULL) 2405 rd_size = i_size_read(pgio->pg_inode) - req_offset(req); 2406 else 2407 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq); 2408 2409 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 2410 req->wb_context, 2411 req_offset(req), 2412 rd_size, 2413 IOMODE_READ, 2414 false, 2415 GFP_KERNEL); 2416 if (IS_ERR(pgio->pg_lseg)) { 2417 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2418 pgio->pg_lseg = NULL; 2419 return; 2420 } 2421 } 2422 /* If no lseg, fall back to read through mds */ 2423 if (pgio->pg_lseg == NULL) 2424 nfs_pageio_reset_read_mds(pgio); 2425 2426 } 2427 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); 2428 2429 void 2430 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 2431 struct nfs_page *req, u64 wb_size) 2432 { 2433 pnfs_generic_pg_check_layout(pgio); 2434 pnfs_generic_pg_check_range(pgio, req); 2435 if (pgio->pg_lseg == NULL) { 2436 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 2437 req->wb_context, 2438 req_offset(req), 2439 wb_size, 2440 IOMODE_RW, 2441 false, 2442 GFP_NOFS); 2443 if (IS_ERR(pgio->pg_lseg)) { 2444 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2445 pgio->pg_lseg = NULL; 2446 return; 2447 } 2448 } 2449 /* If no lseg, fall back to write through mds */ 2450 if (pgio->pg_lseg == NULL) 2451 nfs_pageio_reset_write_mds(pgio); 2452 } 2453 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); 2454 2455 void 2456 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) 2457 { 2458 if (desc->pg_lseg) { 2459 pnfs_put_lseg(desc->pg_lseg); 2460 desc->pg_lseg = NULL; 2461 } 2462 } 2463 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); 2464 2465 /* 2466 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 2467 * of bytes (maximum @req->wb_bytes) that can be coalesced. 2468 */ 2469 size_t 2470 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 2471 struct nfs_page *prev, struct nfs_page *req) 2472 { 2473 unsigned int size; 2474 u64 seg_end, req_start, seg_left; 2475 2476 size = nfs_generic_pg_test(pgio, prev, req); 2477 if (!size) 2478 return 0; 2479 2480 /* 2481 * 'size' contains the number of bytes left in the current page (up 2482 * to the original size asked for in @req->wb_bytes). 2483 * 2484 * Calculate how many bytes are left in the layout segment 2485 * and if there are less bytes than 'size', return that instead. 2486 * 2487 * Please also note that 'end_offset' is actually the offset of the 2488 * first byte that lies outside the pnfs_layout_range. FIXME? 2489 * 2490 */ 2491 if (pgio->pg_lseg) { 2492 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset, 2493 pgio->pg_lseg->pls_range.length); 2494 req_start = req_offset(req); 2495 2496 /* start of request is past the last byte of this segment */ 2497 if (req_start >= seg_end) 2498 return 0; 2499 2500 /* adjust 'size' iff there are fewer bytes left in the 2501 * segment than what nfs_generic_pg_test returned */ 2502 seg_left = seg_end - req_start; 2503 if (seg_left < size) 2504 size = (unsigned int)seg_left; 2505 } 2506 2507 return size; 2508 } 2509 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); 2510 2511 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) 2512 { 2513 struct nfs_pageio_descriptor pgio; 2514 2515 /* Resend all requests through the MDS */ 2516 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, 2517 hdr->completion_ops); 2518 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags); 2519 return nfs_pageio_resend(&pgio, hdr); 2520 } 2521 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); 2522 2523 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) 2524 { 2525 2526 dprintk("pnfs write error = %d\n", hdr->pnfs_error); 2527 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2528 PNFS_LAYOUTRET_ON_ERROR) { 2529 pnfs_return_layout(hdr->inode); 2530 } 2531 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2532 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); 2533 } 2534 2535 /* 2536 * Called by non rpc-based layout drivers 2537 */ 2538 void pnfs_ld_write_done(struct nfs_pgio_header *hdr) 2539 { 2540 if (likely(!hdr->pnfs_error)) { 2541 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, 2542 hdr->mds_offset + hdr->res.count); 2543 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2544 } 2545 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); 2546 if (unlikely(hdr->pnfs_error)) 2547 pnfs_ld_handle_write_error(hdr); 2548 hdr->mds_ops->rpc_release(hdr); 2549 } 2550 EXPORT_SYMBOL_GPL(pnfs_ld_write_done); 2551 2552 static void 2553 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, 2554 struct nfs_pgio_header *hdr) 2555 { 2556 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2557 2558 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2559 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2560 nfs_pageio_reset_write_mds(desc); 2561 mirror->pg_recoalesce = 1; 2562 } 2563 hdr->completion_ops->completion(hdr); 2564 } 2565 2566 static enum pnfs_try_status 2567 pnfs_try_to_write_data(struct nfs_pgio_header *hdr, 2568 const struct rpc_call_ops *call_ops, 2569 struct pnfs_layout_segment *lseg, 2570 int how) 2571 { 2572 struct inode *inode = hdr->inode; 2573 enum pnfs_try_status trypnfs; 2574 struct nfs_server *nfss = NFS_SERVER(inode); 2575 2576 hdr->mds_ops = call_ops; 2577 2578 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, 2579 inode->i_ino, hdr->args.count, hdr->args.offset, how); 2580 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); 2581 if (trypnfs != PNFS_NOT_ATTEMPTED) 2582 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); 2583 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2584 return trypnfs; 2585 } 2586 2587 static void 2588 pnfs_do_write(struct nfs_pageio_descriptor *desc, 2589 struct nfs_pgio_header *hdr, int how) 2590 { 2591 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2592 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2593 enum pnfs_try_status trypnfs; 2594 2595 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); 2596 switch (trypnfs) { 2597 case PNFS_NOT_ATTEMPTED: 2598 pnfs_write_through_mds(desc, hdr); 2599 case PNFS_ATTEMPTED: 2600 break; 2601 case PNFS_TRY_AGAIN: 2602 /* cleanup hdr and prepare to redo pnfs */ 2603 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2604 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2605 list_splice_init(&hdr->pages, &mirror->pg_list); 2606 mirror->pg_recoalesce = 1; 2607 } 2608 hdr->mds_ops->rpc_release(hdr); 2609 } 2610 } 2611 2612 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) 2613 { 2614 pnfs_put_lseg(hdr->lseg); 2615 nfs_pgio_header_free(hdr); 2616 } 2617 2618 int 2619 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 2620 { 2621 struct nfs_pgio_header *hdr; 2622 int ret; 2623 2624 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2625 if (!hdr) { 2626 desc->pg_error = -ENOMEM; 2627 return desc->pg_error; 2628 } 2629 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); 2630 2631 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 2632 ret = nfs_generic_pgio(desc, hdr); 2633 if (!ret) 2634 pnfs_do_write(desc, hdr, desc->pg_ioflags); 2635 2636 return ret; 2637 } 2638 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); 2639 2640 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) 2641 { 2642 struct nfs_pageio_descriptor pgio; 2643 2644 /* Resend all requests through the MDS */ 2645 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); 2646 return nfs_pageio_resend(&pgio, hdr); 2647 } 2648 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); 2649 2650 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) 2651 { 2652 dprintk("pnfs read error = %d\n", hdr->pnfs_error); 2653 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2654 PNFS_LAYOUTRET_ON_ERROR) { 2655 pnfs_return_layout(hdr->inode); 2656 } 2657 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2658 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); 2659 } 2660 2661 /* 2662 * Called by non rpc-based layout drivers 2663 */ 2664 void pnfs_ld_read_done(struct nfs_pgio_header *hdr) 2665 { 2666 if (likely(!hdr->pnfs_error)) 2667 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2668 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); 2669 if (unlikely(hdr->pnfs_error)) 2670 pnfs_ld_handle_read_error(hdr); 2671 hdr->mds_ops->rpc_release(hdr); 2672 } 2673 EXPORT_SYMBOL_GPL(pnfs_ld_read_done); 2674 2675 static void 2676 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, 2677 struct nfs_pgio_header *hdr) 2678 { 2679 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2680 2681 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2682 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2683 nfs_pageio_reset_read_mds(desc); 2684 mirror->pg_recoalesce = 1; 2685 } 2686 hdr->completion_ops->completion(hdr); 2687 } 2688 2689 /* 2690 * Call the appropriate parallel I/O subsystem read function. 2691 */ 2692 static enum pnfs_try_status 2693 pnfs_try_to_read_data(struct nfs_pgio_header *hdr, 2694 const struct rpc_call_ops *call_ops, 2695 struct pnfs_layout_segment *lseg) 2696 { 2697 struct inode *inode = hdr->inode; 2698 struct nfs_server *nfss = NFS_SERVER(inode); 2699 enum pnfs_try_status trypnfs; 2700 2701 hdr->mds_ops = call_ops; 2702 2703 dprintk("%s: Reading ino:%lu %u@%llu\n", 2704 __func__, inode->i_ino, hdr->args.count, hdr->args.offset); 2705 2706 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); 2707 if (trypnfs != PNFS_NOT_ATTEMPTED) 2708 nfs_inc_stats(inode, NFSIOS_PNFS_READ); 2709 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2710 return trypnfs; 2711 } 2712 2713 /* Resend all requests through pnfs. */ 2714 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr) 2715 { 2716 struct nfs_pageio_descriptor pgio; 2717 2718 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2719 /* Prevent deadlocks with layoutreturn! */ 2720 pnfs_put_lseg(hdr->lseg); 2721 hdr->lseg = NULL; 2722 2723 nfs_pageio_init_read(&pgio, hdr->inode, false, 2724 hdr->completion_ops); 2725 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr); 2726 } 2727 } 2728 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); 2729 2730 static void 2731 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) 2732 { 2733 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2734 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2735 enum pnfs_try_status trypnfs; 2736 2737 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); 2738 switch (trypnfs) { 2739 case PNFS_NOT_ATTEMPTED: 2740 pnfs_read_through_mds(desc, hdr); 2741 case PNFS_ATTEMPTED: 2742 break; 2743 case PNFS_TRY_AGAIN: 2744 /* cleanup hdr and prepare to redo pnfs */ 2745 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2746 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2747 list_splice_init(&hdr->pages, &mirror->pg_list); 2748 mirror->pg_recoalesce = 1; 2749 } 2750 hdr->mds_ops->rpc_release(hdr); 2751 } 2752 } 2753 2754 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) 2755 { 2756 pnfs_put_lseg(hdr->lseg); 2757 nfs_pgio_header_free(hdr); 2758 } 2759 2760 int 2761 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) 2762 { 2763 struct nfs_pgio_header *hdr; 2764 int ret; 2765 2766 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2767 if (!hdr) { 2768 desc->pg_error = -ENOMEM; 2769 return desc->pg_error; 2770 } 2771 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); 2772 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 2773 ret = nfs_generic_pgio(desc, hdr); 2774 if (!ret) 2775 pnfs_do_read(desc, hdr); 2776 return ret; 2777 } 2778 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); 2779 2780 static void pnfs_clear_layoutcommitting(struct inode *inode) 2781 { 2782 unsigned long *bitlock = &NFS_I(inode)->flags; 2783 2784 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 2785 smp_mb__after_atomic(); 2786 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 2787 } 2788 2789 /* 2790 * There can be multiple RW segments. 2791 */ 2792 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 2793 { 2794 struct pnfs_layout_segment *lseg; 2795 2796 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { 2797 if (lseg->pls_range.iomode == IOMODE_RW && 2798 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 2799 list_add(&lseg->pls_lc_list, listp); 2800 } 2801 } 2802 2803 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) 2804 { 2805 struct pnfs_layout_segment *lseg, *tmp; 2806 2807 /* Matched by references in pnfs_set_layoutcommit */ 2808 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { 2809 list_del_init(&lseg->pls_lc_list); 2810 pnfs_put_lseg(lseg); 2811 } 2812 2813 pnfs_clear_layoutcommitting(inode); 2814 } 2815 2816 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) 2817 { 2818 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); 2819 } 2820 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); 2821 2822 void 2823 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, 2824 loff_t end_pos) 2825 { 2826 struct nfs_inode *nfsi = NFS_I(inode); 2827 bool mark_as_dirty = false; 2828 2829 spin_lock(&inode->i_lock); 2830 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 2831 nfsi->layout->plh_lwb = end_pos; 2832 mark_as_dirty = true; 2833 dprintk("%s: Set layoutcommit for inode %lu ", 2834 __func__, inode->i_ino); 2835 } else if (end_pos > nfsi->layout->plh_lwb) 2836 nfsi->layout->plh_lwb = end_pos; 2837 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { 2838 /* references matched in nfs4_layoutcommit_release */ 2839 pnfs_get_lseg(lseg); 2840 } 2841 spin_unlock(&inode->i_lock); 2842 dprintk("%s: lseg %p end_pos %llu\n", 2843 __func__, lseg, nfsi->layout->plh_lwb); 2844 2845 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one 2846 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ 2847 if (mark_as_dirty) 2848 mark_inode_dirty_sync(inode); 2849 } 2850 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); 2851 2852 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 2853 { 2854 struct nfs_server *nfss = NFS_SERVER(data->args.inode); 2855 2856 if (nfss->pnfs_curr_ld->cleanup_layoutcommit) 2857 nfss->pnfs_curr_ld->cleanup_layoutcommit(data); 2858 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); 2859 } 2860 2861 /* 2862 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and 2863 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough 2864 * data to disk to allow the server to recover the data if it crashes. 2865 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag 2866 * is off, and a COMMIT is sent to a data server, or 2867 * if WRITEs to a data server return NFS_DATA_SYNC. 2868 */ 2869 int 2870 pnfs_layoutcommit_inode(struct inode *inode, bool sync) 2871 { 2872 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 2873 struct nfs4_layoutcommit_data *data; 2874 struct nfs_inode *nfsi = NFS_I(inode); 2875 loff_t end_pos; 2876 int status; 2877 2878 if (!pnfs_layoutcommit_outstanding(inode)) 2879 return 0; 2880 2881 dprintk("--> %s inode %lu\n", __func__, inode->i_ino); 2882 2883 status = -EAGAIN; 2884 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { 2885 if (!sync) 2886 goto out; 2887 status = wait_on_bit_lock_action(&nfsi->flags, 2888 NFS_INO_LAYOUTCOMMITTING, 2889 nfs_wait_bit_killable, 2890 TASK_KILLABLE); 2891 if (status) 2892 goto out; 2893 } 2894 2895 status = -ENOMEM; 2896 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ 2897 data = kzalloc(sizeof(*data), GFP_NOFS); 2898 if (!data) 2899 goto clear_layoutcommitting; 2900 2901 status = 0; 2902 spin_lock(&inode->i_lock); 2903 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 2904 goto out_unlock; 2905 2906 INIT_LIST_HEAD(&data->lseg_list); 2907 pnfs_list_write_lseg(inode, &data->lseg_list); 2908 2909 end_pos = nfsi->layout->plh_lwb; 2910 2911 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); 2912 spin_unlock(&inode->i_lock); 2913 2914 data->args.inode = inode; 2915 data->cred = get_rpccred(nfsi->layout->plh_lc_cred); 2916 nfs_fattr_init(&data->fattr); 2917 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 2918 data->res.fattr = &data->fattr; 2919 if (end_pos != 0) 2920 data->args.lastbytewritten = end_pos - 1; 2921 else 2922 data->args.lastbytewritten = U64_MAX; 2923 data->res.server = NFS_SERVER(inode); 2924 2925 if (ld->prepare_layoutcommit) { 2926 status = ld->prepare_layoutcommit(&data->args); 2927 if (status) { 2928 put_rpccred(data->cred); 2929 spin_lock(&inode->i_lock); 2930 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); 2931 if (end_pos > nfsi->layout->plh_lwb) 2932 nfsi->layout->plh_lwb = end_pos; 2933 goto out_unlock; 2934 } 2935 } 2936 2937 2938 status = nfs4_proc_layoutcommit(data, sync); 2939 out: 2940 if (status) 2941 mark_inode_dirty_sync(inode); 2942 dprintk("<-- %s status %d\n", __func__, status); 2943 return status; 2944 out_unlock: 2945 spin_unlock(&inode->i_lock); 2946 kfree(data); 2947 clear_layoutcommitting: 2948 pnfs_clear_layoutcommitting(inode); 2949 goto out; 2950 } 2951 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); 2952 2953 int 2954 pnfs_generic_sync(struct inode *inode, bool datasync) 2955 { 2956 return pnfs_layoutcommit_inode(inode, true); 2957 } 2958 EXPORT_SYMBOL_GPL(pnfs_generic_sync); 2959 2960 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 2961 { 2962 struct nfs4_threshold *thp; 2963 2964 thp = kzalloc(sizeof(*thp), GFP_NOFS); 2965 if (!thp) { 2966 dprintk("%s mdsthreshold allocation failed\n", __func__); 2967 return NULL; 2968 } 2969 return thp; 2970 } 2971 2972 #if IS_ENABLED(CONFIG_NFS_V4_2) 2973 int 2974 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 2975 { 2976 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 2977 struct nfs_server *server = NFS_SERVER(inode); 2978 struct nfs_inode *nfsi = NFS_I(inode); 2979 struct nfs42_layoutstat_data *data; 2980 struct pnfs_layout_hdr *hdr; 2981 int status = 0; 2982 2983 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) 2984 goto out; 2985 2986 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) 2987 goto out; 2988 2989 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) 2990 goto out; 2991 2992 spin_lock(&inode->i_lock); 2993 if (!NFS_I(inode)->layout) { 2994 spin_unlock(&inode->i_lock); 2995 goto out_clear_layoutstats; 2996 } 2997 hdr = NFS_I(inode)->layout; 2998 pnfs_get_layout_hdr(hdr); 2999 spin_unlock(&inode->i_lock); 3000 3001 data = kzalloc(sizeof(*data), gfp_flags); 3002 if (!data) { 3003 status = -ENOMEM; 3004 goto out_put; 3005 } 3006 3007 data->args.fh = NFS_FH(inode); 3008 data->args.inode = inode; 3009 status = ld->prepare_layoutstats(&data->args); 3010 if (status) 3011 goto out_free; 3012 3013 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); 3014 3015 out: 3016 dprintk("%s returns %d\n", __func__, status); 3017 return status; 3018 3019 out_free: 3020 kfree(data); 3021 out_put: 3022 pnfs_put_layout_hdr(hdr); 3023 out_clear_layoutstats: 3024 smp_mb__before_atomic(); 3025 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); 3026 smp_mb__after_atomic(); 3027 goto out; 3028 } 3029 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); 3030 #endif 3031 3032 unsigned int layoutstats_timer; 3033 module_param(layoutstats_timer, uint, 0644); 3034 EXPORT_SYMBOL_GPL(layoutstats_timer); 3035