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_cred(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 = kmalloc_array(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, i); 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_reply_sz = server->pnfs_curr_ld->max_layoutget_response; 995 size_t max_pages = max_response_pages(server); 996 struct nfs4_layoutget *lgp; 997 998 dprintk("--> %s\n", __func__); 999 1000 lgp = kzalloc(sizeof(*lgp), gfp_flags); 1001 if (lgp == NULL) 1002 return NULL; 1003 1004 if (max_reply_sz) { 1005 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT; 1006 if (npages < max_pages) 1007 max_pages = npages; 1008 } 1009 1010 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 1011 if (!lgp->args.layout.pages) { 1012 kfree(lgp); 1013 return NULL; 1014 } 1015 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 1016 lgp->res.layoutp = &lgp->args.layout; 1017 1018 /* Don't confuse uninitialised result and success */ 1019 lgp->res.status = -NFS4ERR_DELAY; 1020 1021 lgp->args.minlength = PAGE_SIZE; 1022 if (lgp->args.minlength > range->length) 1023 lgp->args.minlength = range->length; 1024 if (ino) { 1025 loff_t i_size = i_size_read(ino); 1026 1027 if (range->iomode == IOMODE_READ) { 1028 if (range->offset >= i_size) 1029 lgp->args.minlength = 0; 1030 else if (i_size - range->offset < lgp->args.minlength) 1031 lgp->args.minlength = i_size - range->offset; 1032 } 1033 } 1034 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; 1035 pnfs_copy_range(&lgp->args.range, range); 1036 lgp->args.type = server->pnfs_curr_ld->id; 1037 lgp->args.inode = ino; 1038 lgp->args.ctx = get_nfs_open_context(ctx); 1039 nfs4_stateid_copy(&lgp->args.stateid, stateid); 1040 lgp->gfp_flags = gfp_flags; 1041 lgp->cred = get_cred(ctx->cred); 1042 return lgp; 1043 } 1044 1045 void pnfs_layoutget_free(struct nfs4_layoutget *lgp) 1046 { 1047 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE; 1048 1049 nfs4_free_pages(lgp->args.layout.pages, max_pages); 1050 if (lgp->args.inode) 1051 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout); 1052 put_cred(lgp->cred); 1053 put_nfs_open_context(lgp->args.ctx); 1054 kfree(lgp); 1055 } 1056 1057 static void pnfs_clear_layoutcommit(struct inode *inode, 1058 struct list_head *head) 1059 { 1060 struct nfs_inode *nfsi = NFS_I(inode); 1061 struct pnfs_layout_segment *lseg, *tmp; 1062 1063 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 1064 return; 1065 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { 1066 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 1067 continue; 1068 pnfs_lseg_dec_and_remove_zero(lseg, head); 1069 } 1070 } 1071 1072 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, 1073 const nfs4_stateid *arg_stateid, 1074 const struct pnfs_layout_range *range, 1075 const nfs4_stateid *stateid) 1076 { 1077 struct inode *inode = lo->plh_inode; 1078 LIST_HEAD(freeme); 1079 1080 spin_lock(&inode->i_lock); 1081 if (!pnfs_layout_is_valid(lo) || !arg_stateid || 1082 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) 1083 goto out_unlock; 1084 if (stateid) { 1085 u32 seq = be32_to_cpu(arg_stateid->seqid); 1086 1087 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq); 1088 pnfs_free_returned_lsegs(lo, &freeme, range, seq); 1089 pnfs_set_layout_stateid(lo, stateid, true); 1090 } else 1091 pnfs_mark_layout_stateid_invalid(lo, &freeme); 1092 out_unlock: 1093 pnfs_clear_layoutreturn_waitbit(lo); 1094 spin_unlock(&inode->i_lock); 1095 pnfs_free_lseg_list(&freeme); 1096 1097 } 1098 1099 static bool 1100 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo, 1101 nfs4_stateid *stateid, 1102 enum pnfs_iomode *iomode) 1103 { 1104 /* Serialise LAYOUTGET/LAYOUTRETURN */ 1105 if (atomic_read(&lo->plh_outstanding) != 0) 1106 return false; 1107 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 1108 return false; 1109 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 1110 pnfs_get_layout_hdr(lo); 1111 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) { 1112 if (stateid != NULL) { 1113 nfs4_stateid_copy(stateid, &lo->plh_stateid); 1114 if (lo->plh_return_seq != 0) 1115 stateid->seqid = cpu_to_be32(lo->plh_return_seq); 1116 } 1117 if (iomode != NULL) 1118 *iomode = lo->plh_return_iomode; 1119 pnfs_clear_layoutreturn_info(lo); 1120 return true; 1121 } 1122 if (stateid != NULL) 1123 nfs4_stateid_copy(stateid, &lo->plh_stateid); 1124 if (iomode != NULL) 1125 *iomode = IOMODE_ANY; 1126 return true; 1127 } 1128 1129 static void 1130 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args, 1131 struct pnfs_layout_hdr *lo, 1132 const nfs4_stateid *stateid, 1133 enum pnfs_iomode iomode) 1134 { 1135 struct inode *inode = lo->plh_inode; 1136 1137 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id; 1138 args->inode = inode; 1139 args->range.iomode = iomode; 1140 args->range.offset = 0; 1141 args->range.length = NFS4_MAX_UINT64; 1142 args->layout = lo; 1143 nfs4_stateid_copy(&args->stateid, stateid); 1144 } 1145 1146 static int 1147 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, const nfs4_stateid *stateid, 1148 enum pnfs_iomode iomode, bool sync) 1149 { 1150 struct inode *ino = lo->plh_inode; 1151 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1152 struct nfs4_layoutreturn *lrp; 1153 int status = 0; 1154 1155 lrp = kzalloc(sizeof(*lrp), GFP_NOFS); 1156 if (unlikely(lrp == NULL)) { 1157 status = -ENOMEM; 1158 spin_lock(&ino->i_lock); 1159 pnfs_clear_layoutreturn_waitbit(lo); 1160 spin_unlock(&ino->i_lock); 1161 pnfs_put_layout_hdr(lo); 1162 goto out; 1163 } 1164 1165 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode); 1166 lrp->args.ld_private = &lrp->ld_private; 1167 lrp->clp = NFS_SERVER(ino)->nfs_client; 1168 lrp->cred = lo->plh_lc_cred; 1169 if (ld->prepare_layoutreturn) 1170 ld->prepare_layoutreturn(&lrp->args); 1171 1172 status = nfs4_proc_layoutreturn(lrp, sync); 1173 out: 1174 dprintk("<-- %s status: %d\n", __func__, status); 1175 return status; 1176 } 1177 1178 /* Return true if layoutreturn is needed */ 1179 static bool 1180 pnfs_layout_need_return(struct pnfs_layout_hdr *lo) 1181 { 1182 struct pnfs_layout_segment *s; 1183 enum pnfs_iomode iomode; 1184 u32 seq; 1185 1186 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1187 return false; 1188 1189 seq = lo->plh_return_seq; 1190 iomode = lo->plh_return_iomode; 1191 1192 /* Defer layoutreturn until all recalled lsegs are done */ 1193 list_for_each_entry(s, &lo->plh_segs, pls_list) { 1194 if (seq && pnfs_seqid_is_newer(s->pls_seq, seq)) 1195 continue; 1196 if (iomode != IOMODE_ANY && s->pls_range.iomode != iomode) 1197 continue; 1198 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags)) 1199 return false; 1200 } 1201 1202 return true; 1203 } 1204 1205 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo) 1206 { 1207 struct inode *inode= lo->plh_inode; 1208 1209 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1210 return; 1211 spin_lock(&inode->i_lock); 1212 if (pnfs_layout_need_return(lo)) { 1213 nfs4_stateid stateid; 1214 enum pnfs_iomode iomode; 1215 bool send; 1216 1217 send = pnfs_prepare_layoutreturn(lo, &stateid, &iomode); 1218 spin_unlock(&inode->i_lock); 1219 if (send) { 1220 /* Send an async layoutreturn so we dont deadlock */ 1221 pnfs_send_layoutreturn(lo, &stateid, iomode, false); 1222 } 1223 } else 1224 spin_unlock(&inode->i_lock); 1225 } 1226 1227 /* 1228 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr 1229 * when the layout segment list is empty. 1230 * 1231 * Note that a pnfs_layout_hdr can exist with an empty layout segment 1232 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the 1233 * deviceid is marked invalid. 1234 */ 1235 int 1236 _pnfs_return_layout(struct inode *ino) 1237 { 1238 struct pnfs_layout_hdr *lo = NULL; 1239 struct nfs_inode *nfsi = NFS_I(ino); 1240 LIST_HEAD(tmp_list); 1241 nfs4_stateid stateid; 1242 int status = 0; 1243 bool send, valid_layout; 1244 1245 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); 1246 1247 spin_lock(&ino->i_lock); 1248 lo = nfsi->layout; 1249 if (!lo) { 1250 spin_unlock(&ino->i_lock); 1251 dprintk("NFS: %s no layout to return\n", __func__); 1252 goto out; 1253 } 1254 /* Reference matched in nfs4_layoutreturn_release */ 1255 pnfs_get_layout_hdr(lo); 1256 /* Is there an outstanding layoutreturn ? */ 1257 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1258 spin_unlock(&ino->i_lock); 1259 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1260 TASK_UNINTERRUPTIBLE)) 1261 goto out_put_layout_hdr; 1262 spin_lock(&ino->i_lock); 1263 } 1264 valid_layout = pnfs_layout_is_valid(lo); 1265 pnfs_clear_layoutcommit(ino, &tmp_list); 1266 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0); 1267 1268 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 1269 struct pnfs_layout_range range = { 1270 .iomode = IOMODE_ANY, 1271 .offset = 0, 1272 .length = NFS4_MAX_UINT64, 1273 }; 1274 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); 1275 } 1276 1277 /* Don't send a LAYOUTRETURN if list was initially empty */ 1278 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) || 1279 !valid_layout) { 1280 spin_unlock(&ino->i_lock); 1281 dprintk("NFS: %s no layout segments to return\n", __func__); 1282 goto out_put_layout_hdr; 1283 } 1284 1285 send = pnfs_prepare_layoutreturn(lo, &stateid, NULL); 1286 spin_unlock(&ino->i_lock); 1287 if (send) 1288 status = pnfs_send_layoutreturn(lo, &stateid, IOMODE_ANY, true); 1289 out_put_layout_hdr: 1290 pnfs_free_lseg_list(&tmp_list); 1291 pnfs_put_layout_hdr(lo); 1292 out: 1293 dprintk("<-- %s status: %d\n", __func__, status); 1294 return status; 1295 } 1296 1297 int 1298 pnfs_commit_and_return_layout(struct inode *inode) 1299 { 1300 struct pnfs_layout_hdr *lo; 1301 int ret; 1302 1303 spin_lock(&inode->i_lock); 1304 lo = NFS_I(inode)->layout; 1305 if (lo == NULL) { 1306 spin_unlock(&inode->i_lock); 1307 return 0; 1308 } 1309 pnfs_get_layout_hdr(lo); 1310 /* Block new layoutgets and read/write to ds */ 1311 lo->plh_block_lgets++; 1312 spin_unlock(&inode->i_lock); 1313 filemap_fdatawait(inode->i_mapping); 1314 ret = pnfs_layoutcommit_inode(inode, true); 1315 if (ret == 0) 1316 ret = _pnfs_return_layout(inode); 1317 spin_lock(&inode->i_lock); 1318 lo->plh_block_lgets--; 1319 spin_unlock(&inode->i_lock); 1320 pnfs_put_layout_hdr(lo); 1321 return ret; 1322 } 1323 1324 bool pnfs_roc(struct inode *ino, 1325 struct nfs4_layoutreturn_args *args, 1326 struct nfs4_layoutreturn_res *res, 1327 const struct cred *cred) 1328 { 1329 struct nfs_inode *nfsi = NFS_I(ino); 1330 struct nfs_open_context *ctx; 1331 struct nfs4_state *state; 1332 struct pnfs_layout_hdr *lo; 1333 struct pnfs_layout_segment *lseg, *next; 1334 nfs4_stateid stateid; 1335 enum pnfs_iomode iomode = 0; 1336 bool layoutreturn = false, roc = false; 1337 bool skip_read = false; 1338 1339 if (!nfs_have_layout(ino)) 1340 return false; 1341 retry: 1342 rcu_read_lock(); 1343 spin_lock(&ino->i_lock); 1344 lo = nfsi->layout; 1345 if (!lo || !pnfs_layout_is_valid(lo) || 1346 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1347 lo = NULL; 1348 goto out_noroc; 1349 } 1350 pnfs_get_layout_hdr(lo); 1351 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1352 spin_unlock(&ino->i_lock); 1353 rcu_read_unlock(); 1354 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1355 TASK_UNINTERRUPTIBLE); 1356 pnfs_put_layout_hdr(lo); 1357 goto retry; 1358 } 1359 1360 /* no roc if we hold a delegation */ 1361 if (nfs4_check_delegation(ino, FMODE_READ)) { 1362 if (nfs4_check_delegation(ino, FMODE_WRITE)) 1363 goto out_noroc; 1364 skip_read = true; 1365 } 1366 1367 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 1368 state = ctx->state; 1369 if (state == NULL) 1370 continue; 1371 /* Don't return layout if there is open file state */ 1372 if (state->state & FMODE_WRITE) 1373 goto out_noroc; 1374 if (state->state & FMODE_READ) 1375 skip_read = true; 1376 } 1377 1378 1379 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) { 1380 if (skip_read && lseg->pls_range.iomode == IOMODE_READ) 1381 continue; 1382 /* If we are sending layoutreturn, invalidate all valid lsegs */ 1383 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags)) 1384 continue; 1385 /* 1386 * Note: mark lseg for return so pnfs_layout_remove_lseg 1387 * doesn't invalidate the layout for us. 1388 */ 1389 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 1390 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs)) 1391 continue; 1392 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 1393 } 1394 1395 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1396 goto out_noroc; 1397 1398 /* ROC in two conditions: 1399 * 1. there are ROC lsegs 1400 * 2. we don't send layoutreturn 1401 */ 1402 /* lo ref dropped in pnfs_roc_release() */ 1403 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &iomode); 1404 /* If the creds don't match, we can't compound the layoutreturn */ 1405 if (!layoutreturn || cred != lo->plh_lc_cred) 1406 goto out_noroc; 1407 1408 roc = layoutreturn; 1409 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode); 1410 res->lrs_present = 0; 1411 layoutreturn = false; 1412 1413 out_noroc: 1414 spin_unlock(&ino->i_lock); 1415 rcu_read_unlock(); 1416 pnfs_layoutcommit_inode(ino, true); 1417 if (roc) { 1418 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1419 if (ld->prepare_layoutreturn) 1420 ld->prepare_layoutreturn(args); 1421 pnfs_put_layout_hdr(lo); 1422 return true; 1423 } 1424 if (layoutreturn) 1425 pnfs_send_layoutreturn(lo, &stateid, iomode, true); 1426 pnfs_put_layout_hdr(lo); 1427 return false; 1428 } 1429 1430 void pnfs_roc_release(struct nfs4_layoutreturn_args *args, 1431 struct nfs4_layoutreturn_res *res, 1432 int ret) 1433 { 1434 struct pnfs_layout_hdr *lo = args->layout; 1435 const nfs4_stateid *arg_stateid = NULL; 1436 const nfs4_stateid *res_stateid = NULL; 1437 struct nfs4_xdr_opaque_data *ld_private = args->ld_private; 1438 1439 if (ret == 0) { 1440 arg_stateid = &args->stateid; 1441 if (res->lrs_present) 1442 res_stateid = &res->stateid; 1443 } 1444 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range, 1445 res_stateid); 1446 if (ld_private && ld_private->ops && ld_private->ops->free) 1447 ld_private->ops->free(ld_private); 1448 pnfs_put_layout_hdr(lo); 1449 trace_nfs4_layoutreturn_on_close(args->inode, 0); 1450 } 1451 1452 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) 1453 { 1454 struct nfs_inode *nfsi = NFS_I(ino); 1455 struct pnfs_layout_hdr *lo; 1456 bool sleep = false; 1457 1458 /* we might not have grabbed lo reference. so need to check under 1459 * i_lock */ 1460 spin_lock(&ino->i_lock); 1461 lo = nfsi->layout; 1462 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1463 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1464 sleep = true; 1465 } 1466 spin_unlock(&ino->i_lock); 1467 return sleep; 1468 } 1469 1470 /* 1471 * Compare two layout segments for sorting into layout cache. 1472 * We want to preferentially return RW over RO layouts, so ensure those 1473 * are seen first. 1474 */ 1475 static s64 1476 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, 1477 const struct pnfs_layout_range *l2) 1478 { 1479 s64 d; 1480 1481 /* high offset > low offset */ 1482 d = l1->offset - l2->offset; 1483 if (d) 1484 return d; 1485 1486 /* short length > long length */ 1487 d = l2->length - l1->length; 1488 if (d) 1489 return d; 1490 1491 /* read > read/write */ 1492 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); 1493 } 1494 1495 static bool 1496 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1, 1497 const struct pnfs_layout_range *l2) 1498 { 1499 return pnfs_lseg_range_cmp(l1, l2) > 0; 1500 } 1501 1502 static bool 1503 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg, 1504 struct pnfs_layout_segment *old) 1505 { 1506 return false; 1507 } 1508 1509 void 1510 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1511 struct pnfs_layout_segment *lseg, 1512 bool (*is_after)(const struct pnfs_layout_range *, 1513 const struct pnfs_layout_range *), 1514 bool (*do_merge)(struct pnfs_layout_segment *, 1515 struct pnfs_layout_segment *), 1516 struct list_head *free_me) 1517 { 1518 struct pnfs_layout_segment *lp, *tmp; 1519 1520 dprintk("%s:Begin\n", __func__); 1521 1522 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) { 1523 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0) 1524 continue; 1525 if (do_merge(lseg, lp)) { 1526 mark_lseg_invalid(lp, free_me); 1527 continue; 1528 } 1529 if (is_after(&lseg->pls_range, &lp->pls_range)) 1530 continue; 1531 list_add_tail(&lseg->pls_list, &lp->pls_list); 1532 dprintk("%s: inserted lseg %p " 1533 "iomode %d offset %llu length %llu before " 1534 "lp %p iomode %d offset %llu length %llu\n", 1535 __func__, lseg, lseg->pls_range.iomode, 1536 lseg->pls_range.offset, lseg->pls_range.length, 1537 lp, lp->pls_range.iomode, lp->pls_range.offset, 1538 lp->pls_range.length); 1539 goto out; 1540 } 1541 list_add_tail(&lseg->pls_list, &lo->plh_segs); 1542 dprintk("%s: inserted lseg %p " 1543 "iomode %d offset %llu length %llu at tail\n", 1544 __func__, lseg, lseg->pls_range.iomode, 1545 lseg->pls_range.offset, lseg->pls_range.length); 1546 out: 1547 pnfs_get_layout_hdr(lo); 1548 1549 dprintk("%s:Return\n", __func__); 1550 } 1551 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg); 1552 1553 static void 1554 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1555 struct pnfs_layout_segment *lseg, 1556 struct list_head *free_me) 1557 { 1558 struct inode *inode = lo->plh_inode; 1559 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 1560 1561 if (ld->add_lseg != NULL) 1562 ld->add_lseg(lo, lseg, free_me); 1563 else 1564 pnfs_generic_layout_insert_lseg(lo, lseg, 1565 pnfs_lseg_range_is_after, 1566 pnfs_lseg_no_merge, 1567 free_me); 1568 } 1569 1570 static struct pnfs_layout_hdr * 1571 alloc_init_layout_hdr(struct inode *ino, 1572 struct nfs_open_context *ctx, 1573 gfp_t gfp_flags) 1574 { 1575 struct pnfs_layout_hdr *lo; 1576 1577 lo = pnfs_alloc_layout_hdr(ino, gfp_flags); 1578 if (!lo) 1579 return NULL; 1580 refcount_set(&lo->plh_refcount, 1); 1581 INIT_LIST_HEAD(&lo->plh_layouts); 1582 INIT_LIST_HEAD(&lo->plh_segs); 1583 INIT_LIST_HEAD(&lo->plh_return_segs); 1584 INIT_LIST_HEAD(&lo->plh_bulk_destroy); 1585 lo->plh_inode = ino; 1586 lo->plh_lc_cred = get_cred(ctx->cred); 1587 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID; 1588 return lo; 1589 } 1590 1591 static struct pnfs_layout_hdr * 1592 pnfs_find_alloc_layout(struct inode *ino, 1593 struct nfs_open_context *ctx, 1594 gfp_t gfp_flags) 1595 __releases(&ino->i_lock) 1596 __acquires(&ino->i_lock) 1597 { 1598 struct nfs_inode *nfsi = NFS_I(ino); 1599 struct pnfs_layout_hdr *new = NULL; 1600 1601 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); 1602 1603 if (nfsi->layout != NULL) 1604 goto out_existing; 1605 spin_unlock(&ino->i_lock); 1606 new = alloc_init_layout_hdr(ino, ctx, gfp_flags); 1607 spin_lock(&ino->i_lock); 1608 1609 if (likely(nfsi->layout == NULL)) { /* Won the race? */ 1610 nfsi->layout = new; 1611 return new; 1612 } else if (new != NULL) 1613 pnfs_free_layout_hdr(new); 1614 out_existing: 1615 pnfs_get_layout_hdr(nfsi->layout); 1616 return nfsi->layout; 1617 } 1618 1619 /* 1620 * iomode matching rules: 1621 * iomode lseg strict match 1622 * iomode 1623 * ----- ----- ------ ----- 1624 * ANY READ N/A true 1625 * ANY RW N/A true 1626 * RW READ N/A false 1627 * RW RW N/A true 1628 * READ READ N/A true 1629 * READ RW true false 1630 * READ RW false true 1631 */ 1632 static bool 1633 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, 1634 const struct pnfs_layout_range *range, 1635 bool strict_iomode) 1636 { 1637 struct pnfs_layout_range range1; 1638 1639 if ((range->iomode == IOMODE_RW && 1640 ls_range->iomode != IOMODE_RW) || 1641 (range->iomode != ls_range->iomode && 1642 strict_iomode) || 1643 !pnfs_lseg_range_intersecting(ls_range, range)) 1644 return false; 1645 1646 /* range1 covers only the first byte in the range */ 1647 range1 = *range; 1648 range1.length = 1; 1649 return pnfs_lseg_range_contained(ls_range, &range1); 1650 } 1651 1652 /* 1653 * lookup range in layout 1654 */ 1655 static struct pnfs_layout_segment * 1656 pnfs_find_lseg(struct pnfs_layout_hdr *lo, 1657 struct pnfs_layout_range *range, 1658 bool strict_iomode) 1659 { 1660 struct pnfs_layout_segment *lseg, *ret = NULL; 1661 1662 dprintk("%s:Begin\n", __func__); 1663 1664 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 1665 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && 1666 pnfs_lseg_range_match(&lseg->pls_range, range, 1667 strict_iomode)) { 1668 ret = pnfs_get_lseg(lseg); 1669 break; 1670 } 1671 } 1672 1673 dprintk("%s:Return lseg %p ref %d\n", 1674 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0); 1675 return ret; 1676 } 1677 1678 /* 1679 * Use mdsthreshold hints set at each OPEN to determine if I/O should go 1680 * to the MDS or over pNFS 1681 * 1682 * The nfs_inode read_io and write_io fields are cumulative counters reset 1683 * when there are no layout segments. Note that in pnfs_update_layout iomode 1684 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a 1685 * WRITE request. 1686 * 1687 * A return of true means use MDS I/O. 1688 * 1689 * From rfc 5661: 1690 * If a file's size is smaller than the file size threshold, data accesses 1691 * SHOULD be sent to the metadata server. If an I/O request has a length that 1692 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata 1693 * server. If both file size and I/O size are provided, the client SHOULD 1694 * reach or exceed both thresholds before sending its read or write 1695 * requests to the data server. 1696 */ 1697 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, 1698 struct inode *ino, int iomode) 1699 { 1700 struct nfs4_threshold *t = ctx->mdsthreshold; 1701 struct nfs_inode *nfsi = NFS_I(ino); 1702 loff_t fsize = i_size_read(ino); 1703 bool size = false, size_set = false, io = false, io_set = false, ret = false; 1704 1705 if (t == NULL) 1706 return ret; 1707 1708 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", 1709 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); 1710 1711 switch (iomode) { 1712 case IOMODE_READ: 1713 if (t->bm & THRESHOLD_RD) { 1714 dprintk("%s fsize %llu\n", __func__, fsize); 1715 size_set = true; 1716 if (fsize < t->rd_sz) 1717 size = true; 1718 } 1719 if (t->bm & THRESHOLD_RD_IO) { 1720 dprintk("%s nfsi->read_io %llu\n", __func__, 1721 nfsi->read_io); 1722 io_set = true; 1723 if (nfsi->read_io < t->rd_io_sz) 1724 io = true; 1725 } 1726 break; 1727 case IOMODE_RW: 1728 if (t->bm & THRESHOLD_WR) { 1729 dprintk("%s fsize %llu\n", __func__, fsize); 1730 size_set = true; 1731 if (fsize < t->wr_sz) 1732 size = true; 1733 } 1734 if (t->bm & THRESHOLD_WR_IO) { 1735 dprintk("%s nfsi->write_io %llu\n", __func__, 1736 nfsi->write_io); 1737 io_set = true; 1738 if (nfsi->write_io < t->wr_io_sz) 1739 io = true; 1740 } 1741 break; 1742 } 1743 if (size_set && io_set) { 1744 if (size && io) 1745 ret = true; 1746 } else if (size || io) 1747 ret = true; 1748 1749 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); 1750 return ret; 1751 } 1752 1753 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) 1754 { 1755 /* 1756 * send layoutcommit as it can hold up layoutreturn due to lseg 1757 * reference 1758 */ 1759 pnfs_layoutcommit_inode(lo->plh_inode, false); 1760 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, 1761 nfs_wait_bit_killable, 1762 TASK_KILLABLE); 1763 } 1764 1765 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo) 1766 { 1767 atomic_inc(&lo->plh_outstanding); 1768 } 1769 1770 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo) 1771 { 1772 if (atomic_dec_and_test(&lo->plh_outstanding)) 1773 wake_up_var(&lo->plh_outstanding); 1774 } 1775 1776 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) 1777 { 1778 unsigned long *bitlock = &lo->plh_flags; 1779 1780 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); 1781 smp_mb__after_atomic(); 1782 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); 1783 } 1784 1785 static void _add_to_server_list(struct pnfs_layout_hdr *lo, 1786 struct nfs_server *server) 1787 { 1788 if (list_empty(&lo->plh_layouts)) { 1789 struct nfs_client *clp = server->nfs_client; 1790 1791 /* The lo must be on the clp list if there is any 1792 * chance of a CB_LAYOUTRECALL(FILE) coming in. 1793 */ 1794 spin_lock(&clp->cl_lock); 1795 if (list_empty(&lo->plh_layouts)) 1796 list_add_tail(&lo->plh_layouts, &server->layouts); 1797 spin_unlock(&clp->cl_lock); 1798 } 1799 } 1800 1801 /* 1802 * Layout segment is retreived from the server if not cached. 1803 * The appropriate layout segment is referenced and returned to the caller. 1804 */ 1805 struct pnfs_layout_segment * 1806 pnfs_update_layout(struct inode *ino, 1807 struct nfs_open_context *ctx, 1808 loff_t pos, 1809 u64 count, 1810 enum pnfs_iomode iomode, 1811 bool strict_iomode, 1812 gfp_t gfp_flags) 1813 { 1814 struct pnfs_layout_range arg = { 1815 .iomode = iomode, 1816 .offset = pos, 1817 .length = count, 1818 }; 1819 unsigned pg_offset; 1820 struct nfs_server *server = NFS_SERVER(ino); 1821 struct nfs_client *clp = server->nfs_client; 1822 struct pnfs_layout_hdr *lo = NULL; 1823 struct pnfs_layout_segment *lseg = NULL; 1824 struct nfs4_layoutget *lgp; 1825 nfs4_stateid stateid; 1826 long timeout = 0; 1827 unsigned long giveup = jiffies + (clp->cl_lease_time << 1); 1828 bool first; 1829 1830 if (!pnfs_enabled_sb(NFS_SERVER(ino))) { 1831 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1832 PNFS_UPDATE_LAYOUT_NO_PNFS); 1833 goto out; 1834 } 1835 1836 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) { 1837 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1838 PNFS_UPDATE_LAYOUT_MDSTHRESH); 1839 goto out; 1840 } 1841 1842 lookup_again: 1843 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp)); 1844 if (IS_ERR(lseg)) 1845 goto out; 1846 first = false; 1847 spin_lock(&ino->i_lock); 1848 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); 1849 if (lo == NULL) { 1850 spin_unlock(&ino->i_lock); 1851 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1852 PNFS_UPDATE_LAYOUT_NOMEM); 1853 goto out; 1854 } 1855 1856 /* Do we even need to bother with this? */ 1857 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1858 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1859 PNFS_UPDATE_LAYOUT_BULK_RECALL); 1860 dprintk("%s matches recall, use MDS\n", __func__); 1861 goto out_unlock; 1862 } 1863 1864 /* if LAYOUTGET already failed once we don't try again */ 1865 if (pnfs_layout_io_test_failed(lo, iomode)) { 1866 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1867 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); 1868 goto out_unlock; 1869 } 1870 1871 /* 1872 * If the layout segment list is empty, but there are outstanding 1873 * layoutget calls, then they might be subject to a layoutrecall. 1874 */ 1875 if (list_empty(&lo->plh_segs) && 1876 atomic_read(&lo->plh_outstanding) != 0) { 1877 spin_unlock(&ino->i_lock); 1878 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding, 1879 atomic_read(&lo->plh_outstanding))); 1880 if (IS_ERR(lseg) || !list_empty(&lo->plh_segs)) 1881 goto out_put_layout_hdr; 1882 pnfs_put_layout_hdr(lo); 1883 goto lookup_again; 1884 } 1885 1886 lseg = pnfs_find_lseg(lo, &arg, strict_iomode); 1887 if (lseg) { 1888 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1889 PNFS_UPDATE_LAYOUT_FOUND_CACHED); 1890 goto out_unlock; 1891 } 1892 1893 if (!nfs4_valid_open_stateid(ctx->state)) { 1894 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1895 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 1896 goto out_unlock; 1897 } 1898 1899 /* 1900 * Choose a stateid for the LAYOUTGET. If we don't have a layout 1901 * stateid, or it has been invalidated, then we must use the open 1902 * stateid. 1903 */ 1904 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { 1905 1906 /* 1907 * The first layoutget for the file. Need to serialize per 1908 * RFC 5661 Errata 3208. 1909 */ 1910 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, 1911 &lo->plh_flags)) { 1912 spin_unlock(&ino->i_lock); 1913 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, 1914 NFS_LAYOUT_FIRST_LAYOUTGET, 1915 TASK_KILLABLE)); 1916 if (IS_ERR(lseg)) 1917 goto out_put_layout_hdr; 1918 pnfs_put_layout_hdr(lo); 1919 dprintk("%s retrying\n", __func__); 1920 goto lookup_again; 1921 } 1922 1923 first = true; 1924 if (nfs4_select_rw_stateid(ctx->state, 1925 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ, 1926 NULL, &stateid, NULL) != 0) { 1927 trace_pnfs_update_layout(ino, pos, count, 1928 iomode, lo, lseg, 1929 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 1930 goto out_unlock; 1931 } 1932 } else { 1933 nfs4_stateid_copy(&stateid, &lo->plh_stateid); 1934 } 1935 1936 /* 1937 * Because we free lsegs before sending LAYOUTRETURN, we need to wait 1938 * for LAYOUTRETURN even if first is true. 1939 */ 1940 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1941 spin_unlock(&ino->i_lock); 1942 dprintk("%s wait for layoutreturn\n", __func__); 1943 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo)); 1944 if (!IS_ERR(lseg)) { 1945 if (first) 1946 pnfs_clear_first_layoutget(lo); 1947 pnfs_put_layout_hdr(lo); 1948 dprintk("%s retrying\n", __func__); 1949 trace_pnfs_update_layout(ino, pos, count, iomode, lo, 1950 lseg, PNFS_UPDATE_LAYOUT_RETRY); 1951 goto lookup_again; 1952 } 1953 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1954 PNFS_UPDATE_LAYOUT_RETURN); 1955 goto out_put_layout_hdr; 1956 } 1957 1958 if (pnfs_layoutgets_blocked(lo)) { 1959 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1960 PNFS_UPDATE_LAYOUT_BLOCKED); 1961 goto out_unlock; 1962 } 1963 nfs_layoutget_begin(lo); 1964 spin_unlock(&ino->i_lock); 1965 1966 _add_to_server_list(lo, server); 1967 1968 pg_offset = arg.offset & ~PAGE_MASK; 1969 if (pg_offset) { 1970 arg.offset -= pg_offset; 1971 arg.length += pg_offset; 1972 } 1973 if (arg.length != NFS4_MAX_UINT64) 1974 arg.length = PAGE_ALIGN(arg.length); 1975 1976 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags); 1977 if (!lgp) { 1978 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL, 1979 PNFS_UPDATE_LAYOUT_NOMEM); 1980 nfs_layoutget_end(lo); 1981 goto out_put_layout_hdr; 1982 } 1983 1984 lseg = nfs4_proc_layoutget(lgp, &timeout); 1985 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1986 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); 1987 nfs_layoutget_end(lo); 1988 if (IS_ERR(lseg)) { 1989 switch(PTR_ERR(lseg)) { 1990 case -EBUSY: 1991 if (time_after(jiffies, giveup)) 1992 lseg = NULL; 1993 break; 1994 case -ERECALLCONFLICT: 1995 case -EAGAIN: 1996 break; 1997 default: 1998 if (!nfs_error_is_fatal(PTR_ERR(lseg))) { 1999 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2000 lseg = NULL; 2001 } 2002 goto out_put_layout_hdr; 2003 } 2004 if (lseg) { 2005 if (first) 2006 pnfs_clear_first_layoutget(lo); 2007 trace_pnfs_update_layout(ino, pos, count, 2008 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); 2009 pnfs_put_layout_hdr(lo); 2010 goto lookup_again; 2011 } 2012 } else { 2013 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2014 } 2015 2016 out_put_layout_hdr: 2017 if (first) 2018 pnfs_clear_first_layoutget(lo); 2019 pnfs_put_layout_hdr(lo); 2020 out: 2021 dprintk("%s: inode %s/%llu pNFS layout segment %s for " 2022 "(%s, offset: %llu, length: %llu)\n", 2023 __func__, ino->i_sb->s_id, 2024 (unsigned long long)NFS_FILEID(ino), 2025 IS_ERR_OR_NULL(lseg) ? "not found" : "found", 2026 iomode==IOMODE_RW ? "read/write" : "read-only", 2027 (unsigned long long)pos, 2028 (unsigned long long)count); 2029 return lseg; 2030 out_unlock: 2031 spin_unlock(&ino->i_lock); 2032 goto out_put_layout_hdr; 2033 } 2034 EXPORT_SYMBOL_GPL(pnfs_update_layout); 2035 2036 static bool 2037 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) 2038 { 2039 switch (range->iomode) { 2040 case IOMODE_READ: 2041 case IOMODE_RW: 2042 break; 2043 default: 2044 return false; 2045 } 2046 if (range->offset == NFS4_MAX_UINT64) 2047 return false; 2048 if (range->length == 0) 2049 return false; 2050 if (range->length != NFS4_MAX_UINT64 && 2051 range->length > NFS4_MAX_UINT64 - range->offset) 2052 return false; 2053 return true; 2054 } 2055 2056 static struct pnfs_layout_hdr * 2057 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx) 2058 { 2059 struct pnfs_layout_hdr *lo; 2060 2061 spin_lock(&ino->i_lock); 2062 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL); 2063 if (!lo) 2064 goto out_unlock; 2065 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) 2066 goto out_unlock; 2067 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) 2068 goto out_unlock; 2069 if (pnfs_layoutgets_blocked(lo)) 2070 goto out_unlock; 2071 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) 2072 goto out_unlock; 2073 nfs_layoutget_begin(lo); 2074 spin_unlock(&ino->i_lock); 2075 _add_to_server_list(lo, NFS_SERVER(ino)); 2076 return lo; 2077 2078 out_unlock: 2079 spin_unlock(&ino->i_lock); 2080 pnfs_put_layout_hdr(lo); 2081 return NULL; 2082 } 2083 2084 extern const nfs4_stateid current_stateid; 2085 2086 static void _lgopen_prepare_attached(struct nfs4_opendata *data, 2087 struct nfs_open_context *ctx) 2088 { 2089 struct inode *ino = data->dentry->d_inode; 2090 struct pnfs_layout_range rng = { 2091 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2092 IOMODE_RW: IOMODE_READ, 2093 .offset = 0, 2094 .length = NFS4_MAX_UINT64, 2095 }; 2096 struct nfs4_layoutget *lgp; 2097 struct pnfs_layout_hdr *lo; 2098 2099 /* Heuristic: don't send layoutget if we have cached data */ 2100 if (rng.iomode == IOMODE_READ && 2101 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0)) 2102 return; 2103 2104 lo = _pnfs_grab_empty_layout(ino, ctx); 2105 if (!lo) 2106 return; 2107 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, 2108 &rng, GFP_KERNEL); 2109 if (!lgp) { 2110 pnfs_clear_first_layoutget(lo); 2111 pnfs_put_layout_hdr(lo); 2112 return; 2113 } 2114 data->lgp = lgp; 2115 data->o_arg.lg_args = &lgp->args; 2116 data->o_res.lg_res = &lgp->res; 2117 } 2118 2119 static void _lgopen_prepare_floating(struct nfs4_opendata *data, 2120 struct nfs_open_context *ctx) 2121 { 2122 struct pnfs_layout_range rng = { 2123 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2124 IOMODE_RW: IOMODE_READ, 2125 .offset = 0, 2126 .length = NFS4_MAX_UINT64, 2127 }; 2128 struct nfs4_layoutget *lgp; 2129 2130 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid, 2131 &rng, GFP_KERNEL); 2132 if (!lgp) 2133 return; 2134 data->lgp = lgp; 2135 data->o_arg.lg_args = &lgp->args; 2136 data->o_res.lg_res = &lgp->res; 2137 } 2138 2139 void pnfs_lgopen_prepare(struct nfs4_opendata *data, 2140 struct nfs_open_context *ctx) 2141 { 2142 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 2143 2144 if (!(pnfs_enabled_sb(server) && 2145 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN)) 2146 return; 2147 /* Could check on max_ops, but currently hardcoded high enough */ 2148 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN)) 2149 return; 2150 if (data->state) 2151 _lgopen_prepare_attached(data, ctx); 2152 else 2153 _lgopen_prepare_floating(data, ctx); 2154 } 2155 2156 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp, 2157 struct nfs_open_context *ctx) 2158 { 2159 struct pnfs_layout_hdr *lo; 2160 struct pnfs_layout_segment *lseg; 2161 struct nfs_server *srv = NFS_SERVER(ino); 2162 u32 iomode; 2163 2164 if (!lgp) 2165 return; 2166 dprintk("%s: entered with status %i\n", __func__, lgp->res.status); 2167 if (lgp->res.status) { 2168 switch (lgp->res.status) { 2169 default: 2170 break; 2171 /* 2172 * Halt lgopen attempts if the server doesn't recognise 2173 * the "current stateid" value, the layout type, or the 2174 * layoutget operation as being valid. 2175 * Also if it complains about too many ops in the compound 2176 * or of the request/reply being too big. 2177 */ 2178 case -NFS4ERR_BAD_STATEID: 2179 case -NFS4ERR_NOTSUPP: 2180 case -NFS4ERR_REP_TOO_BIG: 2181 case -NFS4ERR_REP_TOO_BIG_TO_CACHE: 2182 case -NFS4ERR_REQ_TOO_BIG: 2183 case -NFS4ERR_TOO_MANY_OPS: 2184 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 2185 srv->caps &= ~NFS_CAP_LGOPEN; 2186 } 2187 return; 2188 } 2189 if (!lgp->args.inode) { 2190 lo = _pnfs_grab_empty_layout(ino, ctx); 2191 if (!lo) 2192 return; 2193 lgp->args.inode = ino; 2194 } else 2195 lo = NFS_I(lgp->args.inode)->layout; 2196 2197 lseg = pnfs_layout_process(lgp); 2198 if (!IS_ERR(lseg)) { 2199 iomode = lgp->args.range.iomode; 2200 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2201 pnfs_put_lseg(lseg); 2202 } 2203 } 2204 2205 void nfs4_lgopen_release(struct nfs4_layoutget *lgp) 2206 { 2207 if (lgp != NULL) { 2208 struct inode *inode = lgp->args.inode; 2209 if (inode) { 2210 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; 2211 pnfs_clear_first_layoutget(lo); 2212 nfs_layoutget_end(lo); 2213 } 2214 pnfs_layoutget_free(lgp); 2215 } 2216 } 2217 2218 struct pnfs_layout_segment * 2219 pnfs_layout_process(struct nfs4_layoutget *lgp) 2220 { 2221 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; 2222 struct nfs4_layoutget_res *res = &lgp->res; 2223 struct pnfs_layout_segment *lseg; 2224 struct inode *ino = lo->plh_inode; 2225 LIST_HEAD(free_me); 2226 2227 if (!pnfs_sanity_check_layout_range(&res->range)) 2228 return ERR_PTR(-EINVAL); 2229 2230 /* Inject layout blob into I/O device driver */ 2231 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); 2232 if (IS_ERR_OR_NULL(lseg)) { 2233 if (!lseg) 2234 lseg = ERR_PTR(-ENOMEM); 2235 2236 dprintk("%s: Could not allocate layout: error %ld\n", 2237 __func__, PTR_ERR(lseg)); 2238 return lseg; 2239 } 2240 2241 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid); 2242 2243 spin_lock(&ino->i_lock); 2244 if (pnfs_layoutgets_blocked(lo)) { 2245 dprintk("%s forget reply due to state\n", __func__); 2246 goto out_forget; 2247 } 2248 2249 if (!pnfs_layout_is_valid(lo)) { 2250 /* We have a completely new layout */ 2251 pnfs_set_layout_stateid(lo, &res->stateid, true); 2252 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { 2253 /* existing state ID, make sure the sequence number matches. */ 2254 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { 2255 dprintk("%s forget reply due to sequence\n", __func__); 2256 goto out_forget; 2257 } 2258 pnfs_set_layout_stateid(lo, &res->stateid, false); 2259 } else { 2260 /* 2261 * We got an entirely new state ID. Mark all segments for the 2262 * inode invalid, and retry the layoutget 2263 */ 2264 pnfs_mark_layout_stateid_invalid(lo, &free_me); 2265 goto out_forget; 2266 } 2267 2268 pnfs_get_lseg(lseg); 2269 pnfs_layout_insert_lseg(lo, lseg, &free_me); 2270 2271 2272 if (res->return_on_close) 2273 set_bit(NFS_LSEG_ROC, &lseg->pls_flags); 2274 2275 spin_unlock(&ino->i_lock); 2276 pnfs_free_lseg_list(&free_me); 2277 return lseg; 2278 2279 out_forget: 2280 spin_unlock(&ino->i_lock); 2281 lseg->pls_layout = lo; 2282 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 2283 return ERR_PTR(-EAGAIN); 2284 } 2285 2286 static int 2287 mark_lseg_invalid_or_return(struct pnfs_layout_segment *lseg, 2288 struct list_head *tmp_list) 2289 { 2290 if (!mark_lseg_invalid(lseg, tmp_list)) 2291 return 0; 2292 pnfs_cache_lseg_for_layoutreturn(lseg->pls_layout, lseg); 2293 return 1; 2294 } 2295 2296 /** 2297 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments 2298 * @lo: pointer to layout header 2299 * @tmp_list: list header to be used with pnfs_free_lseg_list() 2300 * @return_range: describe layout segment ranges to be returned 2301 * @seq: stateid seqid to match 2302 * 2303 * This function is mainly intended for use by layoutrecall. It attempts 2304 * to free the layout segment immediately, or else to mark it for return 2305 * as soon as its reference count drops to zero. 2306 * 2307 * Returns 2308 * - 0: a layoutreturn needs to be scheduled. 2309 * - EBUSY: there are layout segment that are still in use. 2310 * - ENOENT: there are no layout segments that need to be returned. 2311 */ 2312 int 2313 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 2314 struct list_head *tmp_list, 2315 const struct pnfs_layout_range *return_range, 2316 u32 seq) 2317 { 2318 struct pnfs_layout_segment *lseg, *next; 2319 int remaining = 0; 2320 2321 dprintk("%s:Begin lo %p\n", __func__, lo); 2322 2323 assert_spin_locked(&lo->plh_inode->i_lock); 2324 2325 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 2326 if (pnfs_match_lseg_recall(lseg, return_range, seq)) { 2327 dprintk("%s: marking lseg %p iomode %d " 2328 "offset %llu length %llu\n", __func__, 2329 lseg, lseg->pls_range.iomode, 2330 lseg->pls_range.offset, 2331 lseg->pls_range.length); 2332 if (mark_lseg_invalid_or_return(lseg, tmp_list)) 2333 continue; 2334 remaining++; 2335 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 2336 } 2337 2338 if (remaining) { 2339 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2340 return -EBUSY; 2341 } 2342 2343 if (!list_empty(&lo->plh_return_segs)) { 2344 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2345 return 0; 2346 } 2347 2348 return -ENOENT; 2349 } 2350 2351 void pnfs_error_mark_layout_for_return(struct inode *inode, 2352 struct pnfs_layout_segment *lseg) 2353 { 2354 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; 2355 struct pnfs_layout_range range = { 2356 .iomode = lseg->pls_range.iomode, 2357 .offset = 0, 2358 .length = NFS4_MAX_UINT64, 2359 }; 2360 bool return_now = false; 2361 2362 spin_lock(&inode->i_lock); 2363 if (!pnfs_layout_is_valid(lo)) { 2364 spin_unlock(&inode->i_lock); 2365 return; 2366 } 2367 pnfs_set_plh_return_info(lo, range.iomode, 0); 2368 /* 2369 * mark all matching lsegs so that we are sure to have no live 2370 * segments at hand when sending layoutreturn. See pnfs_put_lseg() 2371 * for how it works. 2372 */ 2373 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, &range, 0) != -EBUSY) { 2374 nfs4_stateid stateid; 2375 enum pnfs_iomode iomode; 2376 2377 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &iomode); 2378 spin_unlock(&inode->i_lock); 2379 if (return_now) 2380 pnfs_send_layoutreturn(lo, &stateid, iomode, false); 2381 } else { 2382 spin_unlock(&inode->i_lock); 2383 nfs_commit_inode(inode, 0); 2384 } 2385 } 2386 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); 2387 2388 void 2389 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio) 2390 { 2391 if (pgio->pg_lseg == NULL || 2392 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags)) 2393 return; 2394 pnfs_put_lseg(pgio->pg_lseg); 2395 pgio->pg_lseg = NULL; 2396 } 2397 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); 2398 2399 /* 2400 * Check for any intersection between the request and the pgio->pg_lseg, 2401 * and if none, put this pgio->pg_lseg away. 2402 */ 2403 static void 2404 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2405 { 2406 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) { 2407 pnfs_put_lseg(pgio->pg_lseg); 2408 pgio->pg_lseg = NULL; 2409 } 2410 } 2411 2412 void 2413 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2414 { 2415 u64 rd_size = req->wb_bytes; 2416 2417 pnfs_generic_pg_check_layout(pgio); 2418 pnfs_generic_pg_check_range(pgio, req); 2419 if (pgio->pg_lseg == NULL) { 2420 if (pgio->pg_dreq == NULL) 2421 rd_size = i_size_read(pgio->pg_inode) - req_offset(req); 2422 else 2423 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq); 2424 2425 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 2426 req->wb_context, 2427 req_offset(req), 2428 rd_size, 2429 IOMODE_READ, 2430 false, 2431 GFP_KERNEL); 2432 if (IS_ERR(pgio->pg_lseg)) { 2433 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2434 pgio->pg_lseg = NULL; 2435 return; 2436 } 2437 } 2438 /* If no lseg, fall back to read through mds */ 2439 if (pgio->pg_lseg == NULL) 2440 nfs_pageio_reset_read_mds(pgio); 2441 2442 } 2443 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); 2444 2445 void 2446 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 2447 struct nfs_page *req, u64 wb_size) 2448 { 2449 pnfs_generic_pg_check_layout(pgio); 2450 pnfs_generic_pg_check_range(pgio, req); 2451 if (pgio->pg_lseg == NULL) { 2452 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 2453 req->wb_context, 2454 req_offset(req), 2455 wb_size, 2456 IOMODE_RW, 2457 false, 2458 GFP_NOFS); 2459 if (IS_ERR(pgio->pg_lseg)) { 2460 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2461 pgio->pg_lseg = NULL; 2462 return; 2463 } 2464 } 2465 /* If no lseg, fall back to write through mds */ 2466 if (pgio->pg_lseg == NULL) 2467 nfs_pageio_reset_write_mds(pgio); 2468 } 2469 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); 2470 2471 void 2472 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) 2473 { 2474 if (desc->pg_lseg) { 2475 pnfs_put_lseg(desc->pg_lseg); 2476 desc->pg_lseg = NULL; 2477 } 2478 } 2479 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); 2480 2481 /* 2482 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 2483 * of bytes (maximum @req->wb_bytes) that can be coalesced. 2484 */ 2485 size_t 2486 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 2487 struct nfs_page *prev, struct nfs_page *req) 2488 { 2489 unsigned int size; 2490 u64 seg_end, req_start, seg_left; 2491 2492 size = nfs_generic_pg_test(pgio, prev, req); 2493 if (!size) 2494 return 0; 2495 2496 /* 2497 * 'size' contains the number of bytes left in the current page (up 2498 * to the original size asked for in @req->wb_bytes). 2499 * 2500 * Calculate how many bytes are left in the layout segment 2501 * and if there are less bytes than 'size', return that instead. 2502 * 2503 * Please also note that 'end_offset' is actually the offset of the 2504 * first byte that lies outside the pnfs_layout_range. FIXME? 2505 * 2506 */ 2507 if (pgio->pg_lseg) { 2508 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset, 2509 pgio->pg_lseg->pls_range.length); 2510 req_start = req_offset(req); 2511 2512 /* start of request is past the last byte of this segment */ 2513 if (req_start >= seg_end) 2514 return 0; 2515 2516 /* adjust 'size' iff there are fewer bytes left in the 2517 * segment than what nfs_generic_pg_test returned */ 2518 seg_left = seg_end - req_start; 2519 if (seg_left < size) 2520 size = (unsigned int)seg_left; 2521 } 2522 2523 return size; 2524 } 2525 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); 2526 2527 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) 2528 { 2529 struct nfs_pageio_descriptor pgio; 2530 2531 /* Resend all requests through the MDS */ 2532 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, 2533 hdr->completion_ops); 2534 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags); 2535 return nfs_pageio_resend(&pgio, hdr); 2536 } 2537 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); 2538 2539 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) 2540 { 2541 2542 dprintk("pnfs write error = %d\n", hdr->pnfs_error); 2543 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2544 PNFS_LAYOUTRET_ON_ERROR) { 2545 pnfs_return_layout(hdr->inode); 2546 } 2547 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2548 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); 2549 } 2550 2551 /* 2552 * Called by non rpc-based layout drivers 2553 */ 2554 void pnfs_ld_write_done(struct nfs_pgio_header *hdr) 2555 { 2556 if (likely(!hdr->pnfs_error)) { 2557 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, 2558 hdr->mds_offset + hdr->res.count); 2559 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2560 } 2561 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); 2562 if (unlikely(hdr->pnfs_error)) 2563 pnfs_ld_handle_write_error(hdr); 2564 hdr->mds_ops->rpc_release(hdr); 2565 } 2566 EXPORT_SYMBOL_GPL(pnfs_ld_write_done); 2567 2568 static void 2569 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, 2570 struct nfs_pgio_header *hdr) 2571 { 2572 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2573 2574 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2575 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2576 nfs_pageio_reset_write_mds(desc); 2577 mirror->pg_recoalesce = 1; 2578 } 2579 hdr->completion_ops->completion(hdr); 2580 } 2581 2582 static enum pnfs_try_status 2583 pnfs_try_to_write_data(struct nfs_pgio_header *hdr, 2584 const struct rpc_call_ops *call_ops, 2585 struct pnfs_layout_segment *lseg, 2586 int how) 2587 { 2588 struct inode *inode = hdr->inode; 2589 enum pnfs_try_status trypnfs; 2590 struct nfs_server *nfss = NFS_SERVER(inode); 2591 2592 hdr->mds_ops = call_ops; 2593 2594 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, 2595 inode->i_ino, hdr->args.count, hdr->args.offset, how); 2596 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); 2597 if (trypnfs != PNFS_NOT_ATTEMPTED) 2598 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); 2599 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2600 return trypnfs; 2601 } 2602 2603 static void 2604 pnfs_do_write(struct nfs_pageio_descriptor *desc, 2605 struct nfs_pgio_header *hdr, int how) 2606 { 2607 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2608 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2609 enum pnfs_try_status trypnfs; 2610 2611 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); 2612 switch (trypnfs) { 2613 case PNFS_NOT_ATTEMPTED: 2614 pnfs_write_through_mds(desc, hdr); 2615 case PNFS_ATTEMPTED: 2616 break; 2617 case PNFS_TRY_AGAIN: 2618 /* cleanup hdr and prepare to redo pnfs */ 2619 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2620 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2621 list_splice_init(&hdr->pages, &mirror->pg_list); 2622 mirror->pg_recoalesce = 1; 2623 } 2624 hdr->mds_ops->rpc_release(hdr); 2625 } 2626 } 2627 2628 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) 2629 { 2630 pnfs_put_lseg(hdr->lseg); 2631 nfs_pgio_header_free(hdr); 2632 } 2633 2634 int 2635 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 2636 { 2637 struct nfs_pgio_header *hdr; 2638 int ret; 2639 2640 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2641 if (!hdr) { 2642 desc->pg_error = -ENOMEM; 2643 return desc->pg_error; 2644 } 2645 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); 2646 2647 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 2648 ret = nfs_generic_pgio(desc, hdr); 2649 if (!ret) 2650 pnfs_do_write(desc, hdr, desc->pg_ioflags); 2651 2652 return ret; 2653 } 2654 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); 2655 2656 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) 2657 { 2658 struct nfs_pageio_descriptor pgio; 2659 2660 /* Resend all requests through the MDS */ 2661 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); 2662 return nfs_pageio_resend(&pgio, hdr); 2663 } 2664 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); 2665 2666 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) 2667 { 2668 dprintk("pnfs read error = %d\n", hdr->pnfs_error); 2669 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2670 PNFS_LAYOUTRET_ON_ERROR) { 2671 pnfs_return_layout(hdr->inode); 2672 } 2673 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2674 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); 2675 } 2676 2677 /* 2678 * Called by non rpc-based layout drivers 2679 */ 2680 void pnfs_ld_read_done(struct nfs_pgio_header *hdr) 2681 { 2682 if (likely(!hdr->pnfs_error)) 2683 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2684 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); 2685 if (unlikely(hdr->pnfs_error)) 2686 pnfs_ld_handle_read_error(hdr); 2687 hdr->mds_ops->rpc_release(hdr); 2688 } 2689 EXPORT_SYMBOL_GPL(pnfs_ld_read_done); 2690 2691 static void 2692 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, 2693 struct nfs_pgio_header *hdr) 2694 { 2695 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2696 2697 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2698 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2699 nfs_pageio_reset_read_mds(desc); 2700 mirror->pg_recoalesce = 1; 2701 } 2702 hdr->completion_ops->completion(hdr); 2703 } 2704 2705 /* 2706 * Call the appropriate parallel I/O subsystem read function. 2707 */ 2708 static enum pnfs_try_status 2709 pnfs_try_to_read_data(struct nfs_pgio_header *hdr, 2710 const struct rpc_call_ops *call_ops, 2711 struct pnfs_layout_segment *lseg) 2712 { 2713 struct inode *inode = hdr->inode; 2714 struct nfs_server *nfss = NFS_SERVER(inode); 2715 enum pnfs_try_status trypnfs; 2716 2717 hdr->mds_ops = call_ops; 2718 2719 dprintk("%s: Reading ino:%lu %u@%llu\n", 2720 __func__, inode->i_ino, hdr->args.count, hdr->args.offset); 2721 2722 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); 2723 if (trypnfs != PNFS_NOT_ATTEMPTED) 2724 nfs_inc_stats(inode, NFSIOS_PNFS_READ); 2725 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2726 return trypnfs; 2727 } 2728 2729 /* Resend all requests through pnfs. */ 2730 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr) 2731 { 2732 struct nfs_pageio_descriptor pgio; 2733 2734 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2735 /* Prevent deadlocks with layoutreturn! */ 2736 pnfs_put_lseg(hdr->lseg); 2737 hdr->lseg = NULL; 2738 2739 nfs_pageio_init_read(&pgio, hdr->inode, false, 2740 hdr->completion_ops); 2741 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr); 2742 } 2743 } 2744 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); 2745 2746 static void 2747 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) 2748 { 2749 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2750 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2751 enum pnfs_try_status trypnfs; 2752 2753 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); 2754 switch (trypnfs) { 2755 case PNFS_NOT_ATTEMPTED: 2756 pnfs_read_through_mds(desc, hdr); 2757 case PNFS_ATTEMPTED: 2758 break; 2759 case PNFS_TRY_AGAIN: 2760 /* cleanup hdr and prepare to redo pnfs */ 2761 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2762 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2763 list_splice_init(&hdr->pages, &mirror->pg_list); 2764 mirror->pg_recoalesce = 1; 2765 } 2766 hdr->mds_ops->rpc_release(hdr); 2767 } 2768 } 2769 2770 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) 2771 { 2772 pnfs_put_lseg(hdr->lseg); 2773 nfs_pgio_header_free(hdr); 2774 } 2775 2776 int 2777 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) 2778 { 2779 struct nfs_pgio_header *hdr; 2780 int ret; 2781 2782 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2783 if (!hdr) { 2784 desc->pg_error = -ENOMEM; 2785 return desc->pg_error; 2786 } 2787 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); 2788 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 2789 ret = nfs_generic_pgio(desc, hdr); 2790 if (!ret) 2791 pnfs_do_read(desc, hdr); 2792 return ret; 2793 } 2794 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); 2795 2796 static void pnfs_clear_layoutcommitting(struct inode *inode) 2797 { 2798 unsigned long *bitlock = &NFS_I(inode)->flags; 2799 2800 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 2801 smp_mb__after_atomic(); 2802 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 2803 } 2804 2805 /* 2806 * There can be multiple RW segments. 2807 */ 2808 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 2809 { 2810 struct pnfs_layout_segment *lseg; 2811 2812 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { 2813 if (lseg->pls_range.iomode == IOMODE_RW && 2814 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 2815 list_add(&lseg->pls_lc_list, listp); 2816 } 2817 } 2818 2819 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) 2820 { 2821 struct pnfs_layout_segment *lseg, *tmp; 2822 2823 /* Matched by references in pnfs_set_layoutcommit */ 2824 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { 2825 list_del_init(&lseg->pls_lc_list); 2826 pnfs_put_lseg(lseg); 2827 } 2828 2829 pnfs_clear_layoutcommitting(inode); 2830 } 2831 2832 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) 2833 { 2834 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); 2835 } 2836 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); 2837 2838 void 2839 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, 2840 loff_t end_pos) 2841 { 2842 struct nfs_inode *nfsi = NFS_I(inode); 2843 bool mark_as_dirty = false; 2844 2845 spin_lock(&inode->i_lock); 2846 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 2847 nfsi->layout->plh_lwb = end_pos; 2848 mark_as_dirty = true; 2849 dprintk("%s: Set layoutcommit for inode %lu ", 2850 __func__, inode->i_ino); 2851 } else if (end_pos > nfsi->layout->plh_lwb) 2852 nfsi->layout->plh_lwb = end_pos; 2853 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { 2854 /* references matched in nfs4_layoutcommit_release */ 2855 pnfs_get_lseg(lseg); 2856 } 2857 spin_unlock(&inode->i_lock); 2858 dprintk("%s: lseg %p end_pos %llu\n", 2859 __func__, lseg, nfsi->layout->plh_lwb); 2860 2861 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one 2862 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ 2863 if (mark_as_dirty) 2864 mark_inode_dirty_sync(inode); 2865 } 2866 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); 2867 2868 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 2869 { 2870 struct nfs_server *nfss = NFS_SERVER(data->args.inode); 2871 2872 if (nfss->pnfs_curr_ld->cleanup_layoutcommit) 2873 nfss->pnfs_curr_ld->cleanup_layoutcommit(data); 2874 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); 2875 } 2876 2877 /* 2878 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and 2879 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough 2880 * data to disk to allow the server to recover the data if it crashes. 2881 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag 2882 * is off, and a COMMIT is sent to a data server, or 2883 * if WRITEs to a data server return NFS_DATA_SYNC. 2884 */ 2885 int 2886 pnfs_layoutcommit_inode(struct inode *inode, bool sync) 2887 { 2888 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 2889 struct nfs4_layoutcommit_data *data; 2890 struct nfs_inode *nfsi = NFS_I(inode); 2891 loff_t end_pos; 2892 int status; 2893 2894 if (!pnfs_layoutcommit_outstanding(inode)) 2895 return 0; 2896 2897 dprintk("--> %s inode %lu\n", __func__, inode->i_ino); 2898 2899 status = -EAGAIN; 2900 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { 2901 if (!sync) 2902 goto out; 2903 status = wait_on_bit_lock_action(&nfsi->flags, 2904 NFS_INO_LAYOUTCOMMITTING, 2905 nfs_wait_bit_killable, 2906 TASK_KILLABLE); 2907 if (status) 2908 goto out; 2909 } 2910 2911 status = -ENOMEM; 2912 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ 2913 data = kzalloc(sizeof(*data), GFP_NOFS); 2914 if (!data) 2915 goto clear_layoutcommitting; 2916 2917 status = 0; 2918 spin_lock(&inode->i_lock); 2919 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 2920 goto out_unlock; 2921 2922 INIT_LIST_HEAD(&data->lseg_list); 2923 pnfs_list_write_lseg(inode, &data->lseg_list); 2924 2925 end_pos = nfsi->layout->plh_lwb; 2926 2927 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); 2928 spin_unlock(&inode->i_lock); 2929 2930 data->args.inode = inode; 2931 data->cred = get_cred(nfsi->layout->plh_lc_cred); 2932 nfs_fattr_init(&data->fattr); 2933 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 2934 data->res.fattr = &data->fattr; 2935 if (end_pos != 0) 2936 data->args.lastbytewritten = end_pos - 1; 2937 else 2938 data->args.lastbytewritten = U64_MAX; 2939 data->res.server = NFS_SERVER(inode); 2940 2941 if (ld->prepare_layoutcommit) { 2942 status = ld->prepare_layoutcommit(&data->args); 2943 if (status) { 2944 put_cred(data->cred); 2945 spin_lock(&inode->i_lock); 2946 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); 2947 if (end_pos > nfsi->layout->plh_lwb) 2948 nfsi->layout->plh_lwb = end_pos; 2949 goto out_unlock; 2950 } 2951 } 2952 2953 2954 status = nfs4_proc_layoutcommit(data, sync); 2955 out: 2956 if (status) 2957 mark_inode_dirty_sync(inode); 2958 dprintk("<-- %s status %d\n", __func__, status); 2959 return status; 2960 out_unlock: 2961 spin_unlock(&inode->i_lock); 2962 kfree(data); 2963 clear_layoutcommitting: 2964 pnfs_clear_layoutcommitting(inode); 2965 goto out; 2966 } 2967 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); 2968 2969 int 2970 pnfs_generic_sync(struct inode *inode, bool datasync) 2971 { 2972 return pnfs_layoutcommit_inode(inode, true); 2973 } 2974 EXPORT_SYMBOL_GPL(pnfs_generic_sync); 2975 2976 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 2977 { 2978 struct nfs4_threshold *thp; 2979 2980 thp = kzalloc(sizeof(*thp), GFP_NOFS); 2981 if (!thp) { 2982 dprintk("%s mdsthreshold allocation failed\n", __func__); 2983 return NULL; 2984 } 2985 return thp; 2986 } 2987 2988 #if IS_ENABLED(CONFIG_NFS_V4_2) 2989 int 2990 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 2991 { 2992 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 2993 struct nfs_server *server = NFS_SERVER(inode); 2994 struct nfs_inode *nfsi = NFS_I(inode); 2995 struct nfs42_layoutstat_data *data; 2996 struct pnfs_layout_hdr *hdr; 2997 int status = 0; 2998 2999 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) 3000 goto out; 3001 3002 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) 3003 goto out; 3004 3005 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) 3006 goto out; 3007 3008 spin_lock(&inode->i_lock); 3009 if (!NFS_I(inode)->layout) { 3010 spin_unlock(&inode->i_lock); 3011 goto out_clear_layoutstats; 3012 } 3013 hdr = NFS_I(inode)->layout; 3014 pnfs_get_layout_hdr(hdr); 3015 spin_unlock(&inode->i_lock); 3016 3017 data = kzalloc(sizeof(*data), gfp_flags); 3018 if (!data) { 3019 status = -ENOMEM; 3020 goto out_put; 3021 } 3022 3023 data->args.fh = NFS_FH(inode); 3024 data->args.inode = inode; 3025 status = ld->prepare_layoutstats(&data->args); 3026 if (status) 3027 goto out_free; 3028 3029 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); 3030 3031 out: 3032 dprintk("%s returns %d\n", __func__, status); 3033 return status; 3034 3035 out_free: 3036 kfree(data); 3037 out_put: 3038 pnfs_put_layout_hdr(hdr); 3039 out_clear_layoutstats: 3040 smp_mb__before_atomic(); 3041 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); 3042 smp_mb__after_atomic(); 3043 goto out; 3044 } 3045 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); 3046 #endif 3047 3048 unsigned int layoutstats_timer; 3049 module_param(layoutstats_timer, uint, 0644); 3050 EXPORT_SYMBOL_GPL(layoutstats_timer); 3051