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 (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) { 272 struct nfs_client *clp = server->nfs_client; 273 274 spin_lock(&clp->cl_lock); 275 list_del_rcu(&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 struct inode * 313 pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo) 314 { 315 struct inode *inode = igrab(lo->plh_inode); 316 if (inode) 317 return inode; 318 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags); 319 return NULL; 320 } 321 322 static void 323 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode, 324 u32 seq) 325 { 326 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode) 327 iomode = IOMODE_ANY; 328 lo->plh_return_iomode = iomode; 329 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); 330 if (seq != 0) { 331 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq); 332 lo->plh_return_seq = seq; 333 } 334 } 335 336 static void 337 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo) 338 { 339 struct pnfs_layout_segment *lseg; 340 lo->plh_return_iomode = 0; 341 lo->plh_return_seq = 0; 342 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); 343 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 344 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 345 continue; 346 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 347 } 348 } 349 350 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) 351 { 352 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); 353 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags); 354 smp_mb__after_atomic(); 355 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); 356 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq); 357 } 358 359 static void 360 pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg, 361 struct list_head *free_me) 362 { 363 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags); 364 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 365 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) 366 pnfs_lseg_dec_and_remove_zero(lseg, free_me); 367 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 368 pnfs_lseg_dec_and_remove_zero(lseg, free_me); 369 } 370 371 /* 372 * Update the seqid of a layout stateid after receiving 373 * NFS4ERR_OLD_STATEID 374 */ 375 bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst, 376 struct pnfs_layout_range *dst_range, 377 struct inode *inode) 378 { 379 struct pnfs_layout_hdr *lo; 380 struct pnfs_layout_range range = { 381 .iomode = IOMODE_ANY, 382 .offset = 0, 383 .length = NFS4_MAX_UINT64, 384 }; 385 bool ret = false; 386 LIST_HEAD(head); 387 int err; 388 389 spin_lock(&inode->i_lock); 390 lo = NFS_I(inode)->layout; 391 if (lo && pnfs_layout_is_valid(lo) && 392 nfs4_stateid_match_other(dst, &lo->plh_stateid)) { 393 /* Is our call using the most recent seqid? If so, bump it */ 394 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) { 395 nfs4_stateid_seqid_inc(dst); 396 ret = true; 397 goto out; 398 } 399 /* Try to update the seqid to the most recent */ 400 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0); 401 if (err != -EBUSY) { 402 dst->seqid = lo->plh_stateid.seqid; 403 *dst_range = range; 404 ret = true; 405 } 406 } 407 out: 408 spin_unlock(&inode->i_lock); 409 pnfs_free_lseg_list(&head); 410 return ret; 411 } 412 413 /* 414 * Mark a pnfs_layout_hdr and all associated layout segments as invalid 415 * 416 * In order to continue using the pnfs_layout_hdr, a full recovery 417 * is required. 418 * Note that caller must hold inode->i_lock. 419 */ 420 int 421 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, 422 struct list_head *lseg_list) 423 { 424 struct pnfs_layout_range range = { 425 .iomode = IOMODE_ANY, 426 .offset = 0, 427 .length = NFS4_MAX_UINT64, 428 }; 429 struct pnfs_layout_segment *lseg, *next; 430 431 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 432 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 433 pnfs_clear_lseg_state(lseg, lseg_list); 434 pnfs_clear_layoutreturn_info(lo); 435 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0); 436 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) && 437 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 438 pnfs_clear_layoutreturn_waitbit(lo); 439 return !list_empty(&lo->plh_segs); 440 } 441 442 static int 443 pnfs_iomode_to_fail_bit(u32 iomode) 444 { 445 return iomode == IOMODE_RW ? 446 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; 447 } 448 449 static void 450 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 451 { 452 lo->plh_retry_timestamp = jiffies; 453 if (!test_and_set_bit(fail_bit, &lo->plh_flags)) 454 refcount_inc(&lo->plh_refcount); 455 } 456 457 static void 458 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 459 { 460 if (test_and_clear_bit(fail_bit, &lo->plh_flags)) 461 refcount_dec(&lo->plh_refcount); 462 } 463 464 static void 465 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) 466 { 467 struct inode *inode = lo->plh_inode; 468 struct pnfs_layout_range range = { 469 .iomode = iomode, 470 .offset = 0, 471 .length = NFS4_MAX_UINT64, 472 }; 473 LIST_HEAD(head); 474 475 spin_lock(&inode->i_lock); 476 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 477 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0); 478 spin_unlock(&inode->i_lock); 479 pnfs_free_lseg_list(&head); 480 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, 481 iomode == IOMODE_RW ? "RW" : "READ"); 482 } 483 484 static bool 485 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) 486 { 487 unsigned long start, end; 488 int fail_bit = pnfs_iomode_to_fail_bit(iomode); 489 490 if (test_bit(fail_bit, &lo->plh_flags) == 0) 491 return false; 492 end = jiffies; 493 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; 494 if (!time_in_range(lo->plh_retry_timestamp, start, end)) { 495 /* It is time to retry the failed layoutgets */ 496 pnfs_layout_clear_fail_bit(lo, fail_bit); 497 return false; 498 } 499 return true; 500 } 501 502 static void 503 pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg, 504 const struct pnfs_layout_range *range, 505 const nfs4_stateid *stateid) 506 { 507 INIT_LIST_HEAD(&lseg->pls_list); 508 INIT_LIST_HEAD(&lseg->pls_lc_list); 509 INIT_LIST_HEAD(&lseg->pls_commits); 510 refcount_set(&lseg->pls_refcount, 1); 511 set_bit(NFS_LSEG_VALID, &lseg->pls_flags); 512 lseg->pls_layout = lo; 513 lseg->pls_range = *range; 514 lseg->pls_seq = be32_to_cpu(stateid->seqid); 515 } 516 517 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) 518 { 519 if (lseg != NULL) { 520 struct inode *inode = lseg->pls_layout->plh_inode; 521 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg); 522 } 523 } 524 525 static void 526 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, 527 struct pnfs_layout_segment *lseg) 528 { 529 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 530 list_del_init(&lseg->pls_list); 531 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ 532 refcount_dec(&lo->plh_refcount); 533 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 534 return; 535 if (list_empty(&lo->plh_segs) && 536 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && 537 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 538 if (atomic_read(&lo->plh_outstanding) == 0) 539 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 540 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 541 } 542 } 543 544 static bool 545 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo, 546 struct pnfs_layout_segment *lseg) 547 { 548 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) && 549 pnfs_layout_is_valid(lo)) { 550 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 551 list_move_tail(&lseg->pls_list, &lo->plh_return_segs); 552 return true; 553 } 554 return false; 555 } 556 557 void 558 pnfs_put_lseg(struct pnfs_layout_segment *lseg) 559 { 560 struct pnfs_layout_hdr *lo; 561 struct inode *inode; 562 563 if (!lseg) 564 return; 565 566 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, 567 refcount_read(&lseg->pls_refcount), 568 test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 569 570 lo = lseg->pls_layout; 571 inode = lo->plh_inode; 572 573 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { 574 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 575 spin_unlock(&inode->i_lock); 576 return; 577 } 578 pnfs_get_layout_hdr(lo); 579 pnfs_layout_remove_lseg(lo, lseg); 580 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg)) 581 lseg = NULL; 582 spin_unlock(&inode->i_lock); 583 pnfs_free_lseg(lseg); 584 pnfs_put_layout_hdr(lo); 585 } 586 } 587 EXPORT_SYMBOL_GPL(pnfs_put_lseg); 588 589 /* 590 * is l2 fully contained in l1? 591 * start1 end1 592 * [----------------------------------) 593 * start2 end2 594 * [----------------) 595 */ 596 static bool 597 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, 598 const struct pnfs_layout_range *l2) 599 { 600 u64 start1 = l1->offset; 601 u64 end1 = pnfs_end_offset(start1, l1->length); 602 u64 start2 = l2->offset; 603 u64 end2 = pnfs_end_offset(start2, l2->length); 604 605 return (start1 <= start2) && (end1 >= end2); 606 } 607 608 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, 609 struct list_head *tmp_list) 610 { 611 if (!refcount_dec_and_test(&lseg->pls_refcount)) 612 return false; 613 pnfs_layout_remove_lseg(lseg->pls_layout, lseg); 614 list_add(&lseg->pls_list, tmp_list); 615 return true; 616 } 617 618 /* Returns 1 if lseg is removed from list, 0 otherwise */ 619 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, 620 struct list_head *tmp_list) 621 { 622 int rv = 0; 623 624 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 625 /* Remove the reference keeping the lseg in the 626 * list. It will now be removed when all 627 * outstanding io is finished. 628 */ 629 dprintk("%s: lseg %p ref %d\n", __func__, lseg, 630 refcount_read(&lseg->pls_refcount)); 631 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) 632 rv = 1; 633 } 634 return rv; 635 } 636 637 /* 638 * Compare 2 layout stateid sequence ids, to see which is newer, 639 * taking into account wraparound issues. 640 */ 641 static bool pnfs_seqid_is_newer(u32 s1, u32 s2) 642 { 643 return (s32)(s1 - s2) > 0; 644 } 645 646 static bool 647 pnfs_should_free_range(const struct pnfs_layout_range *lseg_range, 648 const struct pnfs_layout_range *recall_range) 649 { 650 return (recall_range->iomode == IOMODE_ANY || 651 lseg_range->iomode == recall_range->iomode) && 652 pnfs_lseg_range_intersecting(lseg_range, recall_range); 653 } 654 655 static bool 656 pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg, 657 const struct pnfs_layout_range *recall_range, 658 u32 seq) 659 { 660 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq)) 661 return false; 662 if (recall_range == NULL) 663 return true; 664 return pnfs_should_free_range(&lseg->pls_range, recall_range); 665 } 666 667 /** 668 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later 669 * @lo: layout header containing the lsegs 670 * @tmp_list: list head where doomed lsegs should go 671 * @recall_range: optional recall range argument to match (may be NULL) 672 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0) 673 * 674 * Walk the list of lsegs in the layout header, and tear down any that should 675 * be destroyed. If "recall_range" is specified then the segment must match 676 * that range. If "seq" is non-zero, then only match segments that were handed 677 * out at or before that sequence. 678 * 679 * Returns number of matching invalid lsegs remaining in list after scanning 680 * it and purging them. 681 */ 682 int 683 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 684 struct list_head *tmp_list, 685 const struct pnfs_layout_range *recall_range, 686 u32 seq) 687 { 688 struct pnfs_layout_segment *lseg, *next; 689 int remaining = 0; 690 691 dprintk("%s:Begin lo %p\n", __func__, lo); 692 693 if (list_empty(&lo->plh_segs)) 694 return 0; 695 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 696 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) { 697 dprintk("%s: freeing lseg %p iomode %d seq %u " 698 "offset %llu length %llu\n", __func__, 699 lseg, lseg->pls_range.iomode, lseg->pls_seq, 700 lseg->pls_range.offset, lseg->pls_range.length); 701 if (!mark_lseg_invalid(lseg, tmp_list)) 702 remaining++; 703 } 704 dprintk("%s:Return %i\n", __func__, remaining); 705 return remaining; 706 } 707 708 static void 709 pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, 710 struct list_head *free_me, 711 const struct pnfs_layout_range *range, 712 u32 seq) 713 { 714 struct pnfs_layout_segment *lseg, *next; 715 716 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) { 717 if (pnfs_match_lseg_recall(lseg, range, seq)) 718 list_move_tail(&lseg->pls_list, free_me); 719 } 720 } 721 722 /* note free_me must contain lsegs from a single layout_hdr */ 723 void 724 pnfs_free_lseg_list(struct list_head *free_me) 725 { 726 struct pnfs_layout_segment *lseg, *tmp; 727 728 if (list_empty(free_me)) 729 return; 730 731 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { 732 list_del(&lseg->pls_list); 733 pnfs_free_lseg(lseg); 734 } 735 } 736 737 void 738 pnfs_destroy_layout(struct nfs_inode *nfsi) 739 { 740 struct pnfs_layout_hdr *lo; 741 LIST_HEAD(tmp_list); 742 743 spin_lock(&nfsi->vfs_inode.i_lock); 744 lo = nfsi->layout; 745 if (lo) { 746 pnfs_get_layout_hdr(lo); 747 pnfs_mark_layout_stateid_invalid(lo, &tmp_list); 748 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); 749 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); 750 spin_unlock(&nfsi->vfs_inode.i_lock); 751 pnfs_free_lseg_list(&tmp_list); 752 nfs_commit_inode(&nfsi->vfs_inode, 0); 753 pnfs_put_layout_hdr(lo); 754 } else 755 spin_unlock(&nfsi->vfs_inode.i_lock); 756 } 757 EXPORT_SYMBOL_GPL(pnfs_destroy_layout); 758 759 static bool 760 pnfs_layout_add_bulk_destroy_list(struct inode *inode, 761 struct list_head *layout_list) 762 { 763 struct pnfs_layout_hdr *lo; 764 bool ret = false; 765 766 spin_lock(&inode->i_lock); 767 lo = NFS_I(inode)->layout; 768 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) { 769 pnfs_get_layout_hdr(lo); 770 list_add(&lo->plh_bulk_destroy, layout_list); 771 ret = true; 772 } 773 spin_unlock(&inode->i_lock); 774 return ret; 775 } 776 777 /* Caller must hold rcu_read_lock and clp->cl_lock */ 778 static int 779 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp, 780 struct nfs_server *server, 781 struct list_head *layout_list) 782 __must_hold(&clp->cl_lock) 783 __must_hold(RCU) 784 { 785 struct pnfs_layout_hdr *lo, *next; 786 struct inode *inode; 787 788 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) { 789 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 790 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) || 791 !list_empty(&lo->plh_bulk_destroy)) 792 continue; 793 /* If the sb is being destroyed, just bail */ 794 if (!nfs_sb_active(server->super)) 795 break; 796 inode = pnfs_grab_inode_layout_hdr(lo); 797 if (inode != NULL) { 798 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) 799 list_del_rcu(&lo->plh_layouts); 800 if (pnfs_layout_add_bulk_destroy_list(inode, 801 layout_list)) 802 continue; 803 rcu_read_unlock(); 804 spin_unlock(&clp->cl_lock); 805 iput(inode); 806 } else { 807 rcu_read_unlock(); 808 spin_unlock(&clp->cl_lock); 809 } 810 nfs_sb_deactive(server->super); 811 spin_lock(&clp->cl_lock); 812 rcu_read_lock(); 813 return -EAGAIN; 814 } 815 return 0; 816 } 817 818 static int 819 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, 820 bool is_bulk_recall) 821 { 822 struct pnfs_layout_hdr *lo; 823 struct inode *inode; 824 LIST_HEAD(lseg_list); 825 int ret = 0; 826 827 while (!list_empty(layout_list)) { 828 lo = list_entry(layout_list->next, struct pnfs_layout_hdr, 829 plh_bulk_destroy); 830 dprintk("%s freeing layout for inode %lu\n", __func__, 831 lo->plh_inode->i_ino); 832 inode = lo->plh_inode; 833 834 pnfs_layoutcommit_inode(inode, false); 835 836 spin_lock(&inode->i_lock); 837 list_del_init(&lo->plh_bulk_destroy); 838 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) { 839 if (is_bulk_recall) 840 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 841 ret = -EAGAIN; 842 } 843 spin_unlock(&inode->i_lock); 844 pnfs_free_lseg_list(&lseg_list); 845 /* Free all lsegs that are attached to commit buckets */ 846 nfs_commit_inode(inode, 0); 847 pnfs_put_layout_hdr(lo); 848 nfs_iput_and_deactive(inode); 849 } 850 return ret; 851 } 852 853 int 854 pnfs_destroy_layouts_byfsid(struct nfs_client *clp, 855 struct nfs_fsid *fsid, 856 bool is_recall) 857 { 858 struct nfs_server *server; 859 LIST_HEAD(layout_list); 860 861 spin_lock(&clp->cl_lock); 862 rcu_read_lock(); 863 restart: 864 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 865 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0) 866 continue; 867 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 868 server, 869 &layout_list) != 0) 870 goto restart; 871 } 872 rcu_read_unlock(); 873 spin_unlock(&clp->cl_lock); 874 875 if (list_empty(&layout_list)) 876 return 0; 877 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 878 } 879 880 int 881 pnfs_destroy_layouts_byclid(struct nfs_client *clp, 882 bool is_recall) 883 { 884 struct nfs_server *server; 885 LIST_HEAD(layout_list); 886 887 spin_lock(&clp->cl_lock); 888 rcu_read_lock(); 889 restart: 890 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 891 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 892 server, 893 &layout_list) != 0) 894 goto restart; 895 } 896 rcu_read_unlock(); 897 spin_unlock(&clp->cl_lock); 898 899 if (list_empty(&layout_list)) 900 return 0; 901 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 902 } 903 904 /* 905 * Called by the state manger to remove all layouts established under an 906 * expired lease. 907 */ 908 void 909 pnfs_destroy_all_layouts(struct nfs_client *clp) 910 { 911 nfs4_deviceid_mark_client_invalid(clp); 912 nfs4_deviceid_purge_client(clp); 913 914 pnfs_destroy_layouts_byclid(clp, false); 915 } 916 917 static void 918 pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred) 919 { 920 const struct cred *old; 921 922 if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) { 923 old = xchg(&lo->plh_lc_cred, get_cred(cred)); 924 put_cred(old); 925 } 926 } 927 928 /* update lo->plh_stateid with new if is more recent */ 929 void 930 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, 931 const struct cred *cred, bool update_barrier) 932 { 933 u32 oldseq, newseq, new_barrier = 0; 934 935 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 936 newseq = be32_to_cpu(new->seqid); 937 938 if (!pnfs_layout_is_valid(lo)) { 939 pnfs_set_layout_cred(lo, cred); 940 nfs4_stateid_copy(&lo->plh_stateid, new); 941 lo->plh_barrier = newseq; 942 pnfs_clear_layoutreturn_info(lo); 943 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 944 return; 945 } 946 if (pnfs_seqid_is_newer(newseq, oldseq)) { 947 nfs4_stateid_copy(&lo->plh_stateid, new); 948 /* 949 * Because of wraparound, we want to keep the barrier 950 * "close" to the current seqids. 951 */ 952 new_barrier = newseq - atomic_read(&lo->plh_outstanding); 953 } 954 if (update_barrier) 955 new_barrier = be32_to_cpu(new->seqid); 956 else if (new_barrier == 0) 957 return; 958 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier)) 959 lo->plh_barrier = new_barrier; 960 } 961 962 static bool 963 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, 964 const nfs4_stateid *stateid) 965 { 966 u32 seqid = be32_to_cpu(stateid->seqid); 967 968 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier); 969 } 970 971 /* lget is set to 1 if called from inside send_layoutget call chain */ 972 static bool 973 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo) 974 { 975 return lo->plh_block_lgets || 976 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 977 } 978 979 static struct nfs_server * 980 pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx) 981 { 982 struct nfs_server *server; 983 984 if (inode) { 985 server = NFS_SERVER(inode); 986 } else { 987 struct dentry *parent_dir = dget_parent(ctx->dentry); 988 server = NFS_SERVER(parent_dir->d_inode); 989 dput(parent_dir); 990 } 991 return server; 992 } 993 994 static void nfs4_free_pages(struct page **pages, size_t size) 995 { 996 int i; 997 998 if (!pages) 999 return; 1000 1001 for (i = 0; i < size; i++) { 1002 if (!pages[i]) 1003 break; 1004 __free_page(pages[i]); 1005 } 1006 kfree(pages); 1007 } 1008 1009 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 1010 { 1011 struct page **pages; 1012 int i; 1013 1014 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags); 1015 if (!pages) { 1016 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 1017 return NULL; 1018 } 1019 1020 for (i = 0; i < size; i++) { 1021 pages[i] = alloc_page(gfp_flags); 1022 if (!pages[i]) { 1023 dprintk("%s: failed to allocate page\n", __func__); 1024 nfs4_free_pages(pages, i); 1025 return NULL; 1026 } 1027 } 1028 1029 return pages; 1030 } 1031 1032 static struct nfs4_layoutget * 1033 pnfs_alloc_init_layoutget_args(struct inode *ino, 1034 struct nfs_open_context *ctx, 1035 const nfs4_stateid *stateid, 1036 const struct pnfs_layout_range *range, 1037 gfp_t gfp_flags) 1038 { 1039 struct nfs_server *server = pnfs_find_server(ino, ctx); 1040 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response; 1041 size_t max_pages = max_response_pages(server); 1042 struct nfs4_layoutget *lgp; 1043 1044 dprintk("--> %s\n", __func__); 1045 1046 lgp = kzalloc(sizeof(*lgp), gfp_flags); 1047 if (lgp == NULL) 1048 return NULL; 1049 1050 if (max_reply_sz) { 1051 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT; 1052 if (npages < max_pages) 1053 max_pages = npages; 1054 } 1055 1056 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 1057 if (!lgp->args.layout.pages) { 1058 kfree(lgp); 1059 return NULL; 1060 } 1061 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 1062 lgp->res.layoutp = &lgp->args.layout; 1063 1064 /* Don't confuse uninitialised result and success */ 1065 lgp->res.status = -NFS4ERR_DELAY; 1066 1067 lgp->args.minlength = PAGE_SIZE; 1068 if (lgp->args.minlength > range->length) 1069 lgp->args.minlength = range->length; 1070 if (ino) { 1071 loff_t i_size = i_size_read(ino); 1072 1073 if (range->iomode == IOMODE_READ) { 1074 if (range->offset >= i_size) 1075 lgp->args.minlength = 0; 1076 else if (i_size - range->offset < lgp->args.minlength) 1077 lgp->args.minlength = i_size - range->offset; 1078 } 1079 } 1080 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; 1081 pnfs_copy_range(&lgp->args.range, range); 1082 lgp->args.type = server->pnfs_curr_ld->id; 1083 lgp->args.inode = ino; 1084 lgp->args.ctx = get_nfs_open_context(ctx); 1085 nfs4_stateid_copy(&lgp->args.stateid, stateid); 1086 lgp->gfp_flags = gfp_flags; 1087 lgp->cred = ctx->cred; 1088 return lgp; 1089 } 1090 1091 void pnfs_layoutget_free(struct nfs4_layoutget *lgp) 1092 { 1093 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE; 1094 1095 nfs4_free_pages(lgp->args.layout.pages, max_pages); 1096 if (lgp->args.inode) 1097 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout); 1098 put_nfs_open_context(lgp->args.ctx); 1099 kfree(lgp); 1100 } 1101 1102 static void pnfs_clear_layoutcommit(struct inode *inode, 1103 struct list_head *head) 1104 { 1105 struct nfs_inode *nfsi = NFS_I(inode); 1106 struct pnfs_layout_segment *lseg, *tmp; 1107 1108 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 1109 return; 1110 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { 1111 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 1112 continue; 1113 pnfs_lseg_dec_and_remove_zero(lseg, head); 1114 } 1115 } 1116 1117 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, 1118 const nfs4_stateid *arg_stateid, 1119 const struct pnfs_layout_range *range, 1120 const nfs4_stateid *stateid) 1121 { 1122 struct inode *inode = lo->plh_inode; 1123 LIST_HEAD(freeme); 1124 1125 spin_lock(&inode->i_lock); 1126 if (!pnfs_layout_is_valid(lo) || !arg_stateid || 1127 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) 1128 goto out_unlock; 1129 if (stateid) { 1130 u32 seq = be32_to_cpu(arg_stateid->seqid); 1131 1132 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq); 1133 pnfs_free_returned_lsegs(lo, &freeme, range, seq); 1134 pnfs_set_layout_stateid(lo, stateid, NULL, true); 1135 } else 1136 pnfs_mark_layout_stateid_invalid(lo, &freeme); 1137 out_unlock: 1138 pnfs_clear_layoutreturn_waitbit(lo); 1139 spin_unlock(&inode->i_lock); 1140 pnfs_free_lseg_list(&freeme); 1141 1142 } 1143 1144 static bool 1145 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo, 1146 nfs4_stateid *stateid, 1147 const struct cred **cred, 1148 enum pnfs_iomode *iomode) 1149 { 1150 /* Serialise LAYOUTGET/LAYOUTRETURN */ 1151 if (atomic_read(&lo->plh_outstanding) != 0) 1152 return false; 1153 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 1154 return false; 1155 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 1156 pnfs_get_layout_hdr(lo); 1157 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) { 1158 nfs4_stateid_copy(stateid, &lo->plh_stateid); 1159 *cred = get_cred(lo->plh_lc_cred); 1160 if (lo->plh_return_seq != 0) 1161 stateid->seqid = cpu_to_be32(lo->plh_return_seq); 1162 if (iomode != NULL) 1163 *iomode = lo->plh_return_iomode; 1164 pnfs_clear_layoutreturn_info(lo); 1165 return true; 1166 } 1167 nfs4_stateid_copy(stateid, &lo->plh_stateid); 1168 *cred = get_cred(lo->plh_lc_cred); 1169 if (iomode != NULL) 1170 *iomode = IOMODE_ANY; 1171 return true; 1172 } 1173 1174 static void 1175 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args, 1176 struct pnfs_layout_hdr *lo, 1177 const nfs4_stateid *stateid, 1178 enum pnfs_iomode iomode) 1179 { 1180 struct inode *inode = lo->plh_inode; 1181 1182 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id; 1183 args->inode = inode; 1184 args->range.iomode = iomode; 1185 args->range.offset = 0; 1186 args->range.length = NFS4_MAX_UINT64; 1187 args->layout = lo; 1188 nfs4_stateid_copy(&args->stateid, stateid); 1189 } 1190 1191 static int 1192 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, 1193 const nfs4_stateid *stateid, 1194 const struct cred **pcred, 1195 enum pnfs_iomode iomode, 1196 bool sync) 1197 { 1198 struct inode *ino = lo->plh_inode; 1199 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1200 struct nfs4_layoutreturn *lrp; 1201 const struct cred *cred = *pcred; 1202 int status = 0; 1203 1204 *pcred = NULL; 1205 lrp = kzalloc(sizeof(*lrp), GFP_NOFS); 1206 if (unlikely(lrp == NULL)) { 1207 status = -ENOMEM; 1208 spin_lock(&ino->i_lock); 1209 pnfs_clear_layoutreturn_waitbit(lo); 1210 spin_unlock(&ino->i_lock); 1211 put_cred(cred); 1212 pnfs_put_layout_hdr(lo); 1213 goto out; 1214 } 1215 1216 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode); 1217 lrp->args.ld_private = &lrp->ld_private; 1218 lrp->clp = NFS_SERVER(ino)->nfs_client; 1219 lrp->cred = cred; 1220 if (ld->prepare_layoutreturn) 1221 ld->prepare_layoutreturn(&lrp->args); 1222 1223 status = nfs4_proc_layoutreturn(lrp, sync); 1224 out: 1225 dprintk("<-- %s status: %d\n", __func__, status); 1226 return status; 1227 } 1228 1229 /* Return true if layoutreturn is needed */ 1230 static bool 1231 pnfs_layout_need_return(struct pnfs_layout_hdr *lo) 1232 { 1233 struct pnfs_layout_segment *s; 1234 enum pnfs_iomode iomode; 1235 u32 seq; 1236 1237 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1238 return false; 1239 1240 seq = lo->plh_return_seq; 1241 iomode = lo->plh_return_iomode; 1242 1243 /* Defer layoutreturn until all recalled lsegs are done */ 1244 list_for_each_entry(s, &lo->plh_segs, pls_list) { 1245 if (seq && pnfs_seqid_is_newer(s->pls_seq, seq)) 1246 continue; 1247 if (iomode != IOMODE_ANY && s->pls_range.iomode != iomode) 1248 continue; 1249 if (test_bit(NFS_LSEG_LAYOUTRETURN, &s->pls_flags)) 1250 return false; 1251 } 1252 1253 return true; 1254 } 1255 1256 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo) 1257 { 1258 struct inode *inode= lo->plh_inode; 1259 1260 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1261 return; 1262 spin_lock(&inode->i_lock); 1263 if (pnfs_layout_need_return(lo)) { 1264 const struct cred *cred; 1265 nfs4_stateid stateid; 1266 enum pnfs_iomode iomode; 1267 bool send; 1268 1269 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); 1270 spin_unlock(&inode->i_lock); 1271 if (send) { 1272 /* Send an async layoutreturn so we dont deadlock */ 1273 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false); 1274 } 1275 } else 1276 spin_unlock(&inode->i_lock); 1277 } 1278 1279 /* 1280 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr 1281 * when the layout segment list is empty. 1282 * 1283 * Note that a pnfs_layout_hdr can exist with an empty layout segment 1284 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the 1285 * deviceid is marked invalid. 1286 */ 1287 int 1288 _pnfs_return_layout(struct inode *ino) 1289 { 1290 struct pnfs_layout_hdr *lo = NULL; 1291 struct nfs_inode *nfsi = NFS_I(ino); 1292 LIST_HEAD(tmp_list); 1293 const struct cred *cred; 1294 nfs4_stateid stateid; 1295 int status = 0; 1296 bool send, valid_layout; 1297 1298 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); 1299 1300 spin_lock(&ino->i_lock); 1301 lo = nfsi->layout; 1302 if (!lo) { 1303 spin_unlock(&ino->i_lock); 1304 dprintk("NFS: %s no layout to return\n", __func__); 1305 goto out; 1306 } 1307 /* Reference matched in nfs4_layoutreturn_release */ 1308 pnfs_get_layout_hdr(lo); 1309 /* Is there an outstanding layoutreturn ? */ 1310 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1311 spin_unlock(&ino->i_lock); 1312 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1313 TASK_UNINTERRUPTIBLE)) 1314 goto out_put_layout_hdr; 1315 spin_lock(&ino->i_lock); 1316 } 1317 valid_layout = pnfs_layout_is_valid(lo); 1318 pnfs_clear_layoutcommit(ino, &tmp_list); 1319 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0); 1320 1321 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 1322 struct pnfs_layout_range range = { 1323 .iomode = IOMODE_ANY, 1324 .offset = 0, 1325 .length = NFS4_MAX_UINT64, 1326 }; 1327 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); 1328 } 1329 1330 /* Don't send a LAYOUTRETURN if list was initially empty */ 1331 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) || 1332 !valid_layout) { 1333 spin_unlock(&ino->i_lock); 1334 dprintk("NFS: %s no layout segments to return\n", __func__); 1335 goto out_wait_layoutreturn; 1336 } 1337 1338 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL); 1339 spin_unlock(&ino->i_lock); 1340 if (send) 1341 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true); 1342 out_wait_layoutreturn: 1343 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE); 1344 out_put_layout_hdr: 1345 pnfs_free_lseg_list(&tmp_list); 1346 pnfs_put_layout_hdr(lo); 1347 out: 1348 dprintk("<-- %s status: %d\n", __func__, status); 1349 return status; 1350 } 1351 1352 int 1353 pnfs_commit_and_return_layout(struct inode *inode) 1354 { 1355 struct pnfs_layout_hdr *lo; 1356 int ret; 1357 1358 spin_lock(&inode->i_lock); 1359 lo = NFS_I(inode)->layout; 1360 if (lo == NULL) { 1361 spin_unlock(&inode->i_lock); 1362 return 0; 1363 } 1364 pnfs_get_layout_hdr(lo); 1365 /* Block new layoutgets and read/write to ds */ 1366 lo->plh_block_lgets++; 1367 spin_unlock(&inode->i_lock); 1368 filemap_fdatawait(inode->i_mapping); 1369 ret = pnfs_layoutcommit_inode(inode, true); 1370 if (ret == 0) 1371 ret = _pnfs_return_layout(inode); 1372 spin_lock(&inode->i_lock); 1373 lo->plh_block_lgets--; 1374 spin_unlock(&inode->i_lock); 1375 pnfs_put_layout_hdr(lo); 1376 return ret; 1377 } 1378 1379 bool pnfs_roc(struct inode *ino, 1380 struct nfs4_layoutreturn_args *args, 1381 struct nfs4_layoutreturn_res *res, 1382 const struct cred *cred) 1383 { 1384 struct nfs_inode *nfsi = NFS_I(ino); 1385 struct nfs_open_context *ctx; 1386 struct nfs4_state *state; 1387 struct pnfs_layout_hdr *lo; 1388 struct pnfs_layout_segment *lseg, *next; 1389 const struct cred *lc_cred; 1390 nfs4_stateid stateid; 1391 enum pnfs_iomode iomode = 0; 1392 bool layoutreturn = false, roc = false; 1393 bool skip_read = false; 1394 1395 if (!nfs_have_layout(ino)) 1396 return false; 1397 retry: 1398 rcu_read_lock(); 1399 spin_lock(&ino->i_lock); 1400 lo = nfsi->layout; 1401 if (!lo || !pnfs_layout_is_valid(lo) || 1402 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1403 lo = NULL; 1404 goto out_noroc; 1405 } 1406 pnfs_get_layout_hdr(lo); 1407 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1408 spin_unlock(&ino->i_lock); 1409 rcu_read_unlock(); 1410 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1411 TASK_UNINTERRUPTIBLE); 1412 pnfs_put_layout_hdr(lo); 1413 goto retry; 1414 } 1415 1416 /* no roc if we hold a delegation */ 1417 if (nfs4_check_delegation(ino, FMODE_READ)) { 1418 if (nfs4_check_delegation(ino, FMODE_WRITE)) 1419 goto out_noroc; 1420 skip_read = true; 1421 } 1422 1423 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 1424 state = ctx->state; 1425 if (state == NULL) 1426 continue; 1427 /* Don't return layout if there is open file state */ 1428 if (state->state & FMODE_WRITE) 1429 goto out_noroc; 1430 if (state->state & FMODE_READ) 1431 skip_read = true; 1432 } 1433 1434 1435 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) { 1436 if (skip_read && lseg->pls_range.iomode == IOMODE_READ) 1437 continue; 1438 /* If we are sending layoutreturn, invalidate all valid lsegs */ 1439 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags)) 1440 continue; 1441 /* 1442 * Note: mark lseg for return so pnfs_layout_remove_lseg 1443 * doesn't invalidate the layout for us. 1444 */ 1445 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 1446 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs)) 1447 continue; 1448 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 1449 } 1450 1451 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1452 goto out_noroc; 1453 1454 /* ROC in two conditions: 1455 * 1. there are ROC lsegs 1456 * 2. we don't send layoutreturn 1457 */ 1458 /* lo ref dropped in pnfs_roc_release() */ 1459 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode); 1460 /* If the creds don't match, we can't compound the layoutreturn */ 1461 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0) 1462 goto out_noroc; 1463 1464 roc = layoutreturn; 1465 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode); 1466 res->lrs_present = 0; 1467 layoutreturn = false; 1468 put_cred(lc_cred); 1469 1470 out_noroc: 1471 spin_unlock(&ino->i_lock); 1472 rcu_read_unlock(); 1473 pnfs_layoutcommit_inode(ino, true); 1474 if (roc) { 1475 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1476 if (ld->prepare_layoutreturn) 1477 ld->prepare_layoutreturn(args); 1478 pnfs_put_layout_hdr(lo); 1479 return true; 1480 } 1481 if (layoutreturn) 1482 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, true); 1483 pnfs_put_layout_hdr(lo); 1484 return false; 1485 } 1486 1487 int pnfs_roc_done(struct rpc_task *task, struct inode *inode, 1488 struct nfs4_layoutreturn_args **argpp, 1489 struct nfs4_layoutreturn_res **respp, 1490 int *ret) 1491 { 1492 struct nfs4_layoutreturn_args *arg = *argpp; 1493 int retval = -EAGAIN; 1494 1495 if (!arg) 1496 return 0; 1497 /* Handle Layoutreturn errors */ 1498 switch (*ret) { 1499 case 0: 1500 retval = 0; 1501 break; 1502 case -NFS4ERR_NOMATCHING_LAYOUT: 1503 /* Was there an RPC level error? If not, retry */ 1504 if (task->tk_rpc_status == 0) 1505 break; 1506 /* If the call was not sent, let caller handle it */ 1507 if (!RPC_WAS_SENT(task)) 1508 return 0; 1509 /* 1510 * Otherwise, assume the call succeeded and 1511 * that we need to release the layout 1512 */ 1513 *ret = 0; 1514 (*respp)->lrs_present = 0; 1515 retval = 0; 1516 break; 1517 case -NFS4ERR_DELAY: 1518 /* Let the caller handle the retry */ 1519 *ret = -NFS4ERR_NOMATCHING_LAYOUT; 1520 return 0; 1521 case -NFS4ERR_OLD_STATEID: 1522 if (!nfs4_layout_refresh_old_stateid(&arg->stateid, 1523 &arg->range, inode)) 1524 break; 1525 *ret = -NFS4ERR_NOMATCHING_LAYOUT; 1526 return -EAGAIN; 1527 } 1528 *argpp = NULL; 1529 *respp = NULL; 1530 return retval; 1531 } 1532 1533 void pnfs_roc_release(struct nfs4_layoutreturn_args *args, 1534 struct nfs4_layoutreturn_res *res, 1535 int ret) 1536 { 1537 struct pnfs_layout_hdr *lo = args->layout; 1538 const nfs4_stateid *arg_stateid = NULL; 1539 const nfs4_stateid *res_stateid = NULL; 1540 struct nfs4_xdr_opaque_data *ld_private = args->ld_private; 1541 1542 switch (ret) { 1543 case -NFS4ERR_NOMATCHING_LAYOUT: 1544 break; 1545 case 0: 1546 if (res->lrs_present) 1547 res_stateid = &res->stateid; 1548 /* Fallthrough */ 1549 default: 1550 arg_stateid = &args->stateid; 1551 } 1552 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range, 1553 res_stateid); 1554 if (ld_private && ld_private->ops && ld_private->ops->free) 1555 ld_private->ops->free(ld_private); 1556 pnfs_put_layout_hdr(lo); 1557 trace_nfs4_layoutreturn_on_close(args->inode, 0); 1558 } 1559 1560 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) 1561 { 1562 struct nfs_inode *nfsi = NFS_I(ino); 1563 struct pnfs_layout_hdr *lo; 1564 bool sleep = false; 1565 1566 /* we might not have grabbed lo reference. so need to check under 1567 * i_lock */ 1568 spin_lock(&ino->i_lock); 1569 lo = nfsi->layout; 1570 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1571 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1572 sleep = true; 1573 } 1574 spin_unlock(&ino->i_lock); 1575 return sleep; 1576 } 1577 1578 /* 1579 * Compare two layout segments for sorting into layout cache. 1580 * We want to preferentially return RW over RO layouts, so ensure those 1581 * are seen first. 1582 */ 1583 static s64 1584 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, 1585 const struct pnfs_layout_range *l2) 1586 { 1587 s64 d; 1588 1589 /* high offset > low offset */ 1590 d = l1->offset - l2->offset; 1591 if (d) 1592 return d; 1593 1594 /* short length > long length */ 1595 d = l2->length - l1->length; 1596 if (d) 1597 return d; 1598 1599 /* read > read/write */ 1600 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); 1601 } 1602 1603 static bool 1604 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1, 1605 const struct pnfs_layout_range *l2) 1606 { 1607 return pnfs_lseg_range_cmp(l1, l2) > 0; 1608 } 1609 1610 static bool 1611 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg, 1612 struct pnfs_layout_segment *old) 1613 { 1614 return false; 1615 } 1616 1617 void 1618 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1619 struct pnfs_layout_segment *lseg, 1620 bool (*is_after)(const struct pnfs_layout_range *, 1621 const struct pnfs_layout_range *), 1622 bool (*do_merge)(struct pnfs_layout_segment *, 1623 struct pnfs_layout_segment *), 1624 struct list_head *free_me) 1625 { 1626 struct pnfs_layout_segment *lp, *tmp; 1627 1628 dprintk("%s:Begin\n", __func__); 1629 1630 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) { 1631 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0) 1632 continue; 1633 if (do_merge(lseg, lp)) { 1634 mark_lseg_invalid(lp, free_me); 1635 continue; 1636 } 1637 if (is_after(&lseg->pls_range, &lp->pls_range)) 1638 continue; 1639 list_add_tail(&lseg->pls_list, &lp->pls_list); 1640 dprintk("%s: inserted lseg %p " 1641 "iomode %d offset %llu length %llu before " 1642 "lp %p iomode %d offset %llu length %llu\n", 1643 __func__, lseg, lseg->pls_range.iomode, 1644 lseg->pls_range.offset, lseg->pls_range.length, 1645 lp, lp->pls_range.iomode, lp->pls_range.offset, 1646 lp->pls_range.length); 1647 goto out; 1648 } 1649 list_add_tail(&lseg->pls_list, &lo->plh_segs); 1650 dprintk("%s: inserted lseg %p " 1651 "iomode %d offset %llu length %llu at tail\n", 1652 __func__, lseg, lseg->pls_range.iomode, 1653 lseg->pls_range.offset, lseg->pls_range.length); 1654 out: 1655 pnfs_get_layout_hdr(lo); 1656 1657 dprintk("%s:Return\n", __func__); 1658 } 1659 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg); 1660 1661 static void 1662 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1663 struct pnfs_layout_segment *lseg, 1664 struct list_head *free_me) 1665 { 1666 struct inode *inode = lo->plh_inode; 1667 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 1668 1669 if (ld->add_lseg != NULL) 1670 ld->add_lseg(lo, lseg, free_me); 1671 else 1672 pnfs_generic_layout_insert_lseg(lo, lseg, 1673 pnfs_lseg_range_is_after, 1674 pnfs_lseg_no_merge, 1675 free_me); 1676 } 1677 1678 static struct pnfs_layout_hdr * 1679 alloc_init_layout_hdr(struct inode *ino, 1680 struct nfs_open_context *ctx, 1681 gfp_t gfp_flags) 1682 { 1683 struct pnfs_layout_hdr *lo; 1684 1685 lo = pnfs_alloc_layout_hdr(ino, gfp_flags); 1686 if (!lo) 1687 return NULL; 1688 refcount_set(&lo->plh_refcount, 1); 1689 INIT_LIST_HEAD(&lo->plh_layouts); 1690 INIT_LIST_HEAD(&lo->plh_segs); 1691 INIT_LIST_HEAD(&lo->plh_return_segs); 1692 INIT_LIST_HEAD(&lo->plh_bulk_destroy); 1693 lo->plh_inode = ino; 1694 lo->plh_lc_cred = get_cred(ctx->cred); 1695 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID; 1696 return lo; 1697 } 1698 1699 static struct pnfs_layout_hdr * 1700 pnfs_find_alloc_layout(struct inode *ino, 1701 struct nfs_open_context *ctx, 1702 gfp_t gfp_flags) 1703 __releases(&ino->i_lock) 1704 __acquires(&ino->i_lock) 1705 { 1706 struct nfs_inode *nfsi = NFS_I(ino); 1707 struct pnfs_layout_hdr *new = NULL; 1708 1709 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); 1710 1711 if (nfsi->layout != NULL) 1712 goto out_existing; 1713 spin_unlock(&ino->i_lock); 1714 new = alloc_init_layout_hdr(ino, ctx, gfp_flags); 1715 spin_lock(&ino->i_lock); 1716 1717 if (likely(nfsi->layout == NULL)) { /* Won the race? */ 1718 nfsi->layout = new; 1719 return new; 1720 } else if (new != NULL) 1721 pnfs_free_layout_hdr(new); 1722 out_existing: 1723 pnfs_get_layout_hdr(nfsi->layout); 1724 return nfsi->layout; 1725 } 1726 1727 /* 1728 * iomode matching rules: 1729 * iomode lseg strict match 1730 * iomode 1731 * ----- ----- ------ ----- 1732 * ANY READ N/A true 1733 * ANY RW N/A true 1734 * RW READ N/A false 1735 * RW RW N/A true 1736 * READ READ N/A true 1737 * READ RW true false 1738 * READ RW false true 1739 */ 1740 static bool 1741 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, 1742 const struct pnfs_layout_range *range, 1743 bool strict_iomode) 1744 { 1745 struct pnfs_layout_range range1; 1746 1747 if ((range->iomode == IOMODE_RW && 1748 ls_range->iomode != IOMODE_RW) || 1749 (range->iomode != ls_range->iomode && 1750 strict_iomode) || 1751 !pnfs_lseg_range_intersecting(ls_range, range)) 1752 return false; 1753 1754 /* range1 covers only the first byte in the range */ 1755 range1 = *range; 1756 range1.length = 1; 1757 return pnfs_lseg_range_contained(ls_range, &range1); 1758 } 1759 1760 /* 1761 * lookup range in layout 1762 */ 1763 static struct pnfs_layout_segment * 1764 pnfs_find_lseg(struct pnfs_layout_hdr *lo, 1765 struct pnfs_layout_range *range, 1766 bool strict_iomode) 1767 { 1768 struct pnfs_layout_segment *lseg, *ret = NULL; 1769 1770 dprintk("%s:Begin\n", __func__); 1771 1772 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 1773 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && 1774 pnfs_lseg_range_match(&lseg->pls_range, range, 1775 strict_iomode)) { 1776 ret = pnfs_get_lseg(lseg); 1777 break; 1778 } 1779 } 1780 1781 dprintk("%s:Return lseg %p ref %d\n", 1782 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0); 1783 return ret; 1784 } 1785 1786 /* 1787 * Use mdsthreshold hints set at each OPEN to determine if I/O should go 1788 * to the MDS or over pNFS 1789 * 1790 * The nfs_inode read_io and write_io fields are cumulative counters reset 1791 * when there are no layout segments. Note that in pnfs_update_layout iomode 1792 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a 1793 * WRITE request. 1794 * 1795 * A return of true means use MDS I/O. 1796 * 1797 * From rfc 5661: 1798 * If a file's size is smaller than the file size threshold, data accesses 1799 * SHOULD be sent to the metadata server. If an I/O request has a length that 1800 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata 1801 * server. If both file size and I/O size are provided, the client SHOULD 1802 * reach or exceed both thresholds before sending its read or write 1803 * requests to the data server. 1804 */ 1805 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, 1806 struct inode *ino, int iomode) 1807 { 1808 struct nfs4_threshold *t = ctx->mdsthreshold; 1809 struct nfs_inode *nfsi = NFS_I(ino); 1810 loff_t fsize = i_size_read(ino); 1811 bool size = false, size_set = false, io = false, io_set = false, ret = false; 1812 1813 if (t == NULL) 1814 return ret; 1815 1816 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", 1817 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); 1818 1819 switch (iomode) { 1820 case IOMODE_READ: 1821 if (t->bm & THRESHOLD_RD) { 1822 dprintk("%s fsize %llu\n", __func__, fsize); 1823 size_set = true; 1824 if (fsize < t->rd_sz) 1825 size = true; 1826 } 1827 if (t->bm & THRESHOLD_RD_IO) { 1828 dprintk("%s nfsi->read_io %llu\n", __func__, 1829 nfsi->read_io); 1830 io_set = true; 1831 if (nfsi->read_io < t->rd_io_sz) 1832 io = true; 1833 } 1834 break; 1835 case IOMODE_RW: 1836 if (t->bm & THRESHOLD_WR) { 1837 dprintk("%s fsize %llu\n", __func__, fsize); 1838 size_set = true; 1839 if (fsize < t->wr_sz) 1840 size = true; 1841 } 1842 if (t->bm & THRESHOLD_WR_IO) { 1843 dprintk("%s nfsi->write_io %llu\n", __func__, 1844 nfsi->write_io); 1845 io_set = true; 1846 if (nfsi->write_io < t->wr_io_sz) 1847 io = true; 1848 } 1849 break; 1850 } 1851 if (size_set && io_set) { 1852 if (size && io) 1853 ret = true; 1854 } else if (size || io) 1855 ret = true; 1856 1857 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); 1858 return ret; 1859 } 1860 1861 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) 1862 { 1863 /* 1864 * send layoutcommit as it can hold up layoutreturn due to lseg 1865 * reference 1866 */ 1867 pnfs_layoutcommit_inode(lo->plh_inode, false); 1868 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, 1869 nfs_wait_bit_killable, 1870 TASK_KILLABLE); 1871 } 1872 1873 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo) 1874 { 1875 atomic_inc(&lo->plh_outstanding); 1876 } 1877 1878 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo) 1879 { 1880 if (atomic_dec_and_test(&lo->plh_outstanding)) 1881 wake_up_var(&lo->plh_outstanding); 1882 } 1883 1884 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) 1885 { 1886 unsigned long *bitlock = &lo->plh_flags; 1887 1888 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); 1889 smp_mb__after_atomic(); 1890 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); 1891 } 1892 1893 static void _add_to_server_list(struct pnfs_layout_hdr *lo, 1894 struct nfs_server *server) 1895 { 1896 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) { 1897 struct nfs_client *clp = server->nfs_client; 1898 1899 /* The lo must be on the clp list if there is any 1900 * chance of a CB_LAYOUTRECALL(FILE) coming in. 1901 */ 1902 spin_lock(&clp->cl_lock); 1903 list_add_tail_rcu(&lo->plh_layouts, &server->layouts); 1904 spin_unlock(&clp->cl_lock); 1905 } 1906 } 1907 1908 /* 1909 * Layout segment is retreived from the server if not cached. 1910 * The appropriate layout segment is referenced and returned to the caller. 1911 */ 1912 struct pnfs_layout_segment * 1913 pnfs_update_layout(struct inode *ino, 1914 struct nfs_open_context *ctx, 1915 loff_t pos, 1916 u64 count, 1917 enum pnfs_iomode iomode, 1918 bool strict_iomode, 1919 gfp_t gfp_flags) 1920 { 1921 struct pnfs_layout_range arg = { 1922 .iomode = iomode, 1923 .offset = pos, 1924 .length = count, 1925 }; 1926 unsigned pg_offset; 1927 struct nfs_server *server = NFS_SERVER(ino); 1928 struct nfs_client *clp = server->nfs_client; 1929 struct pnfs_layout_hdr *lo = NULL; 1930 struct pnfs_layout_segment *lseg = NULL; 1931 struct nfs4_layoutget *lgp; 1932 nfs4_stateid stateid; 1933 long timeout = 0; 1934 unsigned long giveup = jiffies + (clp->cl_lease_time << 1); 1935 bool first; 1936 1937 if (!pnfs_enabled_sb(NFS_SERVER(ino))) { 1938 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1939 PNFS_UPDATE_LAYOUT_NO_PNFS); 1940 goto out; 1941 } 1942 1943 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) { 1944 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1945 PNFS_UPDATE_LAYOUT_MDSTHRESH); 1946 goto out; 1947 } 1948 1949 lookup_again: 1950 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp)); 1951 if (IS_ERR(lseg)) 1952 goto out; 1953 first = false; 1954 spin_lock(&ino->i_lock); 1955 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); 1956 if (lo == NULL) { 1957 spin_unlock(&ino->i_lock); 1958 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1959 PNFS_UPDATE_LAYOUT_NOMEM); 1960 goto out; 1961 } 1962 1963 /* Do we even need to bother with this? */ 1964 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1965 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1966 PNFS_UPDATE_LAYOUT_BULK_RECALL); 1967 dprintk("%s matches recall, use MDS\n", __func__); 1968 goto out_unlock; 1969 } 1970 1971 /* if LAYOUTGET already failed once we don't try again */ 1972 if (pnfs_layout_io_test_failed(lo, iomode)) { 1973 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1974 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); 1975 goto out_unlock; 1976 } 1977 1978 /* 1979 * If the layout segment list is empty, but there are outstanding 1980 * layoutget calls, then they might be subject to a layoutrecall. 1981 */ 1982 if (list_empty(&lo->plh_segs) && 1983 atomic_read(&lo->plh_outstanding) != 0) { 1984 spin_unlock(&ino->i_lock); 1985 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding, 1986 !atomic_read(&lo->plh_outstanding))); 1987 if (IS_ERR(lseg)) 1988 goto out_put_layout_hdr; 1989 pnfs_put_layout_hdr(lo); 1990 goto lookup_again; 1991 } 1992 1993 lseg = pnfs_find_lseg(lo, &arg, strict_iomode); 1994 if (lseg) { 1995 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1996 PNFS_UPDATE_LAYOUT_FOUND_CACHED); 1997 goto out_unlock; 1998 } 1999 2000 /* 2001 * Choose a stateid for the LAYOUTGET. If we don't have a layout 2002 * stateid, or it has been invalidated, then we must use the open 2003 * stateid. 2004 */ 2005 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { 2006 int status; 2007 2008 /* 2009 * The first layoutget for the file. Need to serialize per 2010 * RFC 5661 Errata 3208. 2011 */ 2012 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, 2013 &lo->plh_flags)) { 2014 spin_unlock(&ino->i_lock); 2015 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, 2016 NFS_LAYOUT_FIRST_LAYOUTGET, 2017 TASK_KILLABLE)); 2018 if (IS_ERR(lseg)) 2019 goto out_put_layout_hdr; 2020 pnfs_put_layout_hdr(lo); 2021 dprintk("%s retrying\n", __func__); 2022 goto lookup_again; 2023 } 2024 2025 spin_unlock(&ino->i_lock); 2026 first = true; 2027 status = nfs4_select_rw_stateid(ctx->state, 2028 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ, 2029 NULL, &stateid, NULL); 2030 if (status != 0) { 2031 lseg = ERR_PTR(status); 2032 trace_pnfs_update_layout(ino, pos, count, 2033 iomode, lo, lseg, 2034 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 2035 nfs4_schedule_stateid_recovery(server, ctx->state); 2036 pnfs_clear_first_layoutget(lo); 2037 pnfs_put_layout_hdr(lo); 2038 goto lookup_again; 2039 } 2040 spin_lock(&ino->i_lock); 2041 } else { 2042 nfs4_stateid_copy(&stateid, &lo->plh_stateid); 2043 } 2044 2045 /* 2046 * Because we free lsegs before sending LAYOUTRETURN, we need to wait 2047 * for LAYOUTRETURN even if first is true. 2048 */ 2049 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 2050 spin_unlock(&ino->i_lock); 2051 dprintk("%s wait for layoutreturn\n", __func__); 2052 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo)); 2053 if (!IS_ERR(lseg)) { 2054 if (first) 2055 pnfs_clear_first_layoutget(lo); 2056 pnfs_put_layout_hdr(lo); 2057 dprintk("%s retrying\n", __func__); 2058 trace_pnfs_update_layout(ino, pos, count, iomode, lo, 2059 lseg, PNFS_UPDATE_LAYOUT_RETRY); 2060 goto lookup_again; 2061 } 2062 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2063 PNFS_UPDATE_LAYOUT_RETURN); 2064 goto out_put_layout_hdr; 2065 } 2066 2067 if (pnfs_layoutgets_blocked(lo)) { 2068 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2069 PNFS_UPDATE_LAYOUT_BLOCKED); 2070 goto out_unlock; 2071 } 2072 nfs_layoutget_begin(lo); 2073 spin_unlock(&ino->i_lock); 2074 2075 _add_to_server_list(lo, server); 2076 2077 pg_offset = arg.offset & ~PAGE_MASK; 2078 if (pg_offset) { 2079 arg.offset -= pg_offset; 2080 arg.length += pg_offset; 2081 } 2082 if (arg.length != NFS4_MAX_UINT64) 2083 arg.length = PAGE_ALIGN(arg.length); 2084 2085 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags); 2086 if (!lgp) { 2087 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL, 2088 PNFS_UPDATE_LAYOUT_NOMEM); 2089 nfs_layoutget_end(lo); 2090 goto out_put_layout_hdr; 2091 } 2092 2093 lseg = nfs4_proc_layoutget(lgp, &timeout); 2094 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2095 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); 2096 nfs_layoutget_end(lo); 2097 if (IS_ERR(lseg)) { 2098 switch(PTR_ERR(lseg)) { 2099 case -EBUSY: 2100 if (time_after(jiffies, giveup)) 2101 lseg = NULL; 2102 break; 2103 case -ERECALLCONFLICT: 2104 case -EAGAIN: 2105 break; 2106 default: 2107 if (!nfs_error_is_fatal(PTR_ERR(lseg))) { 2108 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2109 lseg = NULL; 2110 } 2111 goto out_put_layout_hdr; 2112 } 2113 if (lseg) { 2114 if (first) 2115 pnfs_clear_first_layoutget(lo); 2116 trace_pnfs_update_layout(ino, pos, count, 2117 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); 2118 pnfs_put_layout_hdr(lo); 2119 goto lookup_again; 2120 } 2121 } else { 2122 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2123 } 2124 2125 out_put_layout_hdr: 2126 if (first) 2127 pnfs_clear_first_layoutget(lo); 2128 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2129 PNFS_UPDATE_LAYOUT_EXIT); 2130 pnfs_put_layout_hdr(lo); 2131 out: 2132 dprintk("%s: inode %s/%llu pNFS layout segment %s for " 2133 "(%s, offset: %llu, length: %llu)\n", 2134 __func__, ino->i_sb->s_id, 2135 (unsigned long long)NFS_FILEID(ino), 2136 IS_ERR_OR_NULL(lseg) ? "not found" : "found", 2137 iomode==IOMODE_RW ? "read/write" : "read-only", 2138 (unsigned long long)pos, 2139 (unsigned long long)count); 2140 return lseg; 2141 out_unlock: 2142 spin_unlock(&ino->i_lock); 2143 goto out_put_layout_hdr; 2144 } 2145 EXPORT_SYMBOL_GPL(pnfs_update_layout); 2146 2147 static bool 2148 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) 2149 { 2150 switch (range->iomode) { 2151 case IOMODE_READ: 2152 case IOMODE_RW: 2153 break; 2154 default: 2155 return false; 2156 } 2157 if (range->offset == NFS4_MAX_UINT64) 2158 return false; 2159 if (range->length == 0) 2160 return false; 2161 if (range->length != NFS4_MAX_UINT64 && 2162 range->length > NFS4_MAX_UINT64 - range->offset) 2163 return false; 2164 return true; 2165 } 2166 2167 static struct pnfs_layout_hdr * 2168 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx) 2169 { 2170 struct pnfs_layout_hdr *lo; 2171 2172 spin_lock(&ino->i_lock); 2173 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL); 2174 if (!lo) 2175 goto out_unlock; 2176 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) 2177 goto out_unlock; 2178 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) 2179 goto out_unlock; 2180 if (pnfs_layoutgets_blocked(lo)) 2181 goto out_unlock; 2182 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) 2183 goto out_unlock; 2184 nfs_layoutget_begin(lo); 2185 spin_unlock(&ino->i_lock); 2186 _add_to_server_list(lo, NFS_SERVER(ino)); 2187 return lo; 2188 2189 out_unlock: 2190 spin_unlock(&ino->i_lock); 2191 pnfs_put_layout_hdr(lo); 2192 return NULL; 2193 } 2194 2195 static void _lgopen_prepare_attached(struct nfs4_opendata *data, 2196 struct nfs_open_context *ctx) 2197 { 2198 struct inode *ino = data->dentry->d_inode; 2199 struct pnfs_layout_range rng = { 2200 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2201 IOMODE_RW: IOMODE_READ, 2202 .offset = 0, 2203 .length = NFS4_MAX_UINT64, 2204 }; 2205 struct nfs4_layoutget *lgp; 2206 struct pnfs_layout_hdr *lo; 2207 2208 /* Heuristic: don't send layoutget if we have cached data */ 2209 if (rng.iomode == IOMODE_READ && 2210 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0)) 2211 return; 2212 2213 lo = _pnfs_grab_empty_layout(ino, ctx); 2214 if (!lo) 2215 return; 2216 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, 2217 &rng, GFP_KERNEL); 2218 if (!lgp) { 2219 pnfs_clear_first_layoutget(lo); 2220 pnfs_put_layout_hdr(lo); 2221 return; 2222 } 2223 data->lgp = lgp; 2224 data->o_arg.lg_args = &lgp->args; 2225 data->o_res.lg_res = &lgp->res; 2226 } 2227 2228 static void _lgopen_prepare_floating(struct nfs4_opendata *data, 2229 struct nfs_open_context *ctx) 2230 { 2231 struct pnfs_layout_range rng = { 2232 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2233 IOMODE_RW: IOMODE_READ, 2234 .offset = 0, 2235 .length = NFS4_MAX_UINT64, 2236 }; 2237 struct nfs4_layoutget *lgp; 2238 2239 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid, 2240 &rng, GFP_KERNEL); 2241 if (!lgp) 2242 return; 2243 data->lgp = lgp; 2244 data->o_arg.lg_args = &lgp->args; 2245 data->o_res.lg_res = &lgp->res; 2246 } 2247 2248 void pnfs_lgopen_prepare(struct nfs4_opendata *data, 2249 struct nfs_open_context *ctx) 2250 { 2251 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 2252 2253 if (!(pnfs_enabled_sb(server) && 2254 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN)) 2255 return; 2256 /* Could check on max_ops, but currently hardcoded high enough */ 2257 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN)) 2258 return; 2259 if (data->state) 2260 _lgopen_prepare_attached(data, ctx); 2261 else 2262 _lgopen_prepare_floating(data, ctx); 2263 } 2264 2265 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp, 2266 struct nfs_open_context *ctx) 2267 { 2268 struct pnfs_layout_hdr *lo; 2269 struct pnfs_layout_segment *lseg; 2270 struct nfs_server *srv = NFS_SERVER(ino); 2271 u32 iomode; 2272 2273 if (!lgp) 2274 return; 2275 dprintk("%s: entered with status %i\n", __func__, lgp->res.status); 2276 if (lgp->res.status) { 2277 switch (lgp->res.status) { 2278 default: 2279 break; 2280 /* 2281 * Halt lgopen attempts if the server doesn't recognise 2282 * the "current stateid" value, the layout type, or the 2283 * layoutget operation as being valid. 2284 * Also if it complains about too many ops in the compound 2285 * or of the request/reply being too big. 2286 */ 2287 case -NFS4ERR_BAD_STATEID: 2288 case -NFS4ERR_NOTSUPP: 2289 case -NFS4ERR_REP_TOO_BIG: 2290 case -NFS4ERR_REP_TOO_BIG_TO_CACHE: 2291 case -NFS4ERR_REQ_TOO_BIG: 2292 case -NFS4ERR_TOO_MANY_OPS: 2293 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 2294 srv->caps &= ~NFS_CAP_LGOPEN; 2295 } 2296 return; 2297 } 2298 if (!lgp->args.inode) { 2299 lo = _pnfs_grab_empty_layout(ino, ctx); 2300 if (!lo) 2301 return; 2302 lgp->args.inode = ino; 2303 } else 2304 lo = NFS_I(lgp->args.inode)->layout; 2305 2306 lseg = pnfs_layout_process(lgp); 2307 if (!IS_ERR(lseg)) { 2308 iomode = lgp->args.range.iomode; 2309 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2310 pnfs_put_lseg(lseg); 2311 } 2312 } 2313 2314 void nfs4_lgopen_release(struct nfs4_layoutget *lgp) 2315 { 2316 if (lgp != NULL) { 2317 struct inode *inode = lgp->args.inode; 2318 if (inode) { 2319 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; 2320 pnfs_clear_first_layoutget(lo); 2321 nfs_layoutget_end(lo); 2322 } 2323 pnfs_layoutget_free(lgp); 2324 } 2325 } 2326 2327 struct pnfs_layout_segment * 2328 pnfs_layout_process(struct nfs4_layoutget *lgp) 2329 { 2330 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; 2331 struct nfs4_layoutget_res *res = &lgp->res; 2332 struct pnfs_layout_segment *lseg; 2333 struct inode *ino = lo->plh_inode; 2334 LIST_HEAD(free_me); 2335 2336 if (!pnfs_sanity_check_layout_range(&res->range)) 2337 return ERR_PTR(-EINVAL); 2338 2339 /* Inject layout blob into I/O device driver */ 2340 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); 2341 if (IS_ERR_OR_NULL(lseg)) { 2342 if (!lseg) 2343 lseg = ERR_PTR(-ENOMEM); 2344 2345 dprintk("%s: Could not allocate layout: error %ld\n", 2346 __func__, PTR_ERR(lseg)); 2347 return lseg; 2348 } 2349 2350 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid); 2351 2352 spin_lock(&ino->i_lock); 2353 if (pnfs_layoutgets_blocked(lo)) { 2354 dprintk("%s forget reply due to state\n", __func__); 2355 goto out_forget; 2356 } 2357 2358 if (!pnfs_layout_is_valid(lo)) { 2359 /* We have a completely new layout */ 2360 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true); 2361 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { 2362 /* existing state ID, make sure the sequence number matches. */ 2363 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { 2364 dprintk("%s forget reply due to sequence\n", __func__); 2365 goto out_forget; 2366 } 2367 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false); 2368 } else { 2369 /* 2370 * We got an entirely new state ID. Mark all segments for the 2371 * inode invalid, and retry the layoutget 2372 */ 2373 pnfs_mark_layout_stateid_invalid(lo, &free_me); 2374 goto out_forget; 2375 } 2376 2377 pnfs_get_lseg(lseg); 2378 pnfs_layout_insert_lseg(lo, lseg, &free_me); 2379 2380 2381 if (res->return_on_close) 2382 set_bit(NFS_LSEG_ROC, &lseg->pls_flags); 2383 2384 spin_unlock(&ino->i_lock); 2385 pnfs_free_lseg_list(&free_me); 2386 return lseg; 2387 2388 out_forget: 2389 spin_unlock(&ino->i_lock); 2390 lseg->pls_layout = lo; 2391 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 2392 return ERR_PTR(-EAGAIN); 2393 } 2394 2395 static int 2396 mark_lseg_invalid_or_return(struct pnfs_layout_segment *lseg, 2397 struct list_head *tmp_list) 2398 { 2399 if (!mark_lseg_invalid(lseg, tmp_list)) 2400 return 0; 2401 pnfs_cache_lseg_for_layoutreturn(lseg->pls_layout, lseg); 2402 return 1; 2403 } 2404 2405 /** 2406 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments 2407 * @lo: pointer to layout header 2408 * @tmp_list: list header to be used with pnfs_free_lseg_list() 2409 * @return_range: describe layout segment ranges to be returned 2410 * @seq: stateid seqid to match 2411 * 2412 * This function is mainly intended for use by layoutrecall. It attempts 2413 * to free the layout segment immediately, or else to mark it for return 2414 * as soon as its reference count drops to zero. 2415 * 2416 * Returns 2417 * - 0: a layoutreturn needs to be scheduled. 2418 * - EBUSY: there are layout segment that are still in use. 2419 * - ENOENT: there are no layout segments that need to be returned. 2420 */ 2421 int 2422 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 2423 struct list_head *tmp_list, 2424 const struct pnfs_layout_range *return_range, 2425 u32 seq) 2426 { 2427 struct pnfs_layout_segment *lseg, *next; 2428 int remaining = 0; 2429 2430 dprintk("%s:Begin lo %p\n", __func__, lo); 2431 2432 assert_spin_locked(&lo->plh_inode->i_lock); 2433 2434 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 2435 if (pnfs_match_lseg_recall(lseg, return_range, seq)) { 2436 dprintk("%s: marking lseg %p iomode %d " 2437 "offset %llu length %llu\n", __func__, 2438 lseg, lseg->pls_range.iomode, 2439 lseg->pls_range.offset, 2440 lseg->pls_range.length); 2441 if (mark_lseg_invalid_or_return(lseg, tmp_list)) 2442 continue; 2443 remaining++; 2444 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 2445 } 2446 2447 if (remaining) { 2448 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2449 return -EBUSY; 2450 } 2451 2452 if (!list_empty(&lo->plh_return_segs)) { 2453 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2454 return 0; 2455 } 2456 2457 return -ENOENT; 2458 } 2459 2460 static void 2461 pnfs_mark_layout_for_return(struct inode *inode, 2462 const struct pnfs_layout_range *range) 2463 { 2464 struct pnfs_layout_hdr *lo; 2465 bool return_now = false; 2466 2467 spin_lock(&inode->i_lock); 2468 lo = NFS_I(inode)->layout; 2469 if (!pnfs_layout_is_valid(lo)) { 2470 spin_unlock(&inode->i_lock); 2471 return; 2472 } 2473 pnfs_set_plh_return_info(lo, range->iomode, 0); 2474 /* 2475 * mark all matching lsegs so that we are sure to have no live 2476 * segments at hand when sending layoutreturn. See pnfs_put_lseg() 2477 * for how it works. 2478 */ 2479 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) { 2480 const struct cred *cred; 2481 nfs4_stateid stateid; 2482 enum pnfs_iomode iomode; 2483 2484 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); 2485 spin_unlock(&inode->i_lock); 2486 if (return_now) 2487 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false); 2488 } else { 2489 spin_unlock(&inode->i_lock); 2490 nfs_commit_inode(inode, 0); 2491 } 2492 } 2493 2494 void pnfs_error_mark_layout_for_return(struct inode *inode, 2495 struct pnfs_layout_segment *lseg) 2496 { 2497 struct pnfs_layout_range range = { 2498 .iomode = lseg->pls_range.iomode, 2499 .offset = 0, 2500 .length = NFS4_MAX_UINT64, 2501 }; 2502 2503 pnfs_mark_layout_for_return(inode, &range); 2504 } 2505 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); 2506 2507 static bool 2508 pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo) 2509 { 2510 return pnfs_layout_is_valid(lo) && 2511 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) && 2512 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 2513 } 2514 2515 static struct pnfs_layout_segment * 2516 pnfs_find_first_lseg(struct pnfs_layout_hdr *lo, 2517 const struct pnfs_layout_range *range, 2518 enum pnfs_iomode iomode) 2519 { 2520 struct pnfs_layout_segment *lseg; 2521 2522 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 2523 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) 2524 continue; 2525 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 2526 continue; 2527 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY) 2528 continue; 2529 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range)) 2530 return lseg; 2531 } 2532 return NULL; 2533 } 2534 2535 /* Find open file states whose mode matches that of the range */ 2536 static bool 2537 pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo, 2538 const struct pnfs_layout_range *range) 2539 { 2540 struct list_head *head; 2541 struct nfs_open_context *ctx; 2542 fmode_t mode = 0; 2543 2544 if (!pnfs_layout_can_be_returned(lo) || 2545 !pnfs_find_first_lseg(lo, range, range->iomode)) 2546 return false; 2547 2548 head = &NFS_I(lo->plh_inode)->open_files; 2549 list_for_each_entry_rcu(ctx, head, list) { 2550 if (ctx->state) 2551 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE); 2552 } 2553 2554 switch (range->iomode) { 2555 default: 2556 break; 2557 case IOMODE_READ: 2558 mode &= ~FMODE_WRITE; 2559 break; 2560 case IOMODE_RW: 2561 if (pnfs_find_first_lseg(lo, range, IOMODE_READ)) 2562 mode &= ~FMODE_READ; 2563 } 2564 return mode == 0; 2565 } 2566 2567 static int 2568 pnfs_layout_return_unused_byserver(struct nfs_server *server, void *data) 2569 { 2570 const struct pnfs_layout_range *range = data; 2571 struct pnfs_layout_hdr *lo; 2572 struct inode *inode; 2573 restart: 2574 rcu_read_lock(); 2575 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 2576 if (!pnfs_layout_can_be_returned(lo) || 2577 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 2578 continue; 2579 inode = lo->plh_inode; 2580 spin_lock(&inode->i_lock); 2581 if (!pnfs_should_return_unused_layout(lo, range)) { 2582 spin_unlock(&inode->i_lock); 2583 continue; 2584 } 2585 spin_unlock(&inode->i_lock); 2586 inode = pnfs_grab_inode_layout_hdr(lo); 2587 if (!inode) 2588 continue; 2589 rcu_read_unlock(); 2590 pnfs_mark_layout_for_return(inode, range); 2591 iput(inode); 2592 cond_resched(); 2593 goto restart; 2594 } 2595 rcu_read_unlock(); 2596 return 0; 2597 } 2598 2599 void 2600 pnfs_layout_return_unused_byclid(struct nfs_client *clp, 2601 enum pnfs_iomode iomode) 2602 { 2603 struct pnfs_layout_range range = { 2604 .iomode = iomode, 2605 .offset = 0, 2606 .length = NFS4_MAX_UINT64, 2607 }; 2608 2609 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver, 2610 &range); 2611 } 2612 2613 void 2614 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio) 2615 { 2616 if (pgio->pg_lseg == NULL || 2617 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags)) 2618 return; 2619 pnfs_put_lseg(pgio->pg_lseg); 2620 pgio->pg_lseg = NULL; 2621 } 2622 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); 2623 2624 /* 2625 * Check for any intersection between the request and the pgio->pg_lseg, 2626 * and if none, put this pgio->pg_lseg away. 2627 */ 2628 void 2629 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2630 { 2631 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) { 2632 pnfs_put_lseg(pgio->pg_lseg); 2633 pgio->pg_lseg = NULL; 2634 } 2635 } 2636 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_range); 2637 2638 void 2639 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2640 { 2641 u64 rd_size = req->wb_bytes; 2642 2643 pnfs_generic_pg_check_layout(pgio); 2644 pnfs_generic_pg_check_range(pgio, req); 2645 if (pgio->pg_lseg == NULL) { 2646 if (pgio->pg_dreq == NULL) 2647 rd_size = i_size_read(pgio->pg_inode) - req_offset(req); 2648 else 2649 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq); 2650 2651 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 2652 nfs_req_openctx(req), 2653 req_offset(req), 2654 rd_size, 2655 IOMODE_READ, 2656 false, 2657 GFP_KERNEL); 2658 if (IS_ERR(pgio->pg_lseg)) { 2659 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2660 pgio->pg_lseg = NULL; 2661 return; 2662 } 2663 } 2664 /* If no lseg, fall back to read through mds */ 2665 if (pgio->pg_lseg == NULL) 2666 nfs_pageio_reset_read_mds(pgio); 2667 2668 } 2669 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); 2670 2671 void 2672 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 2673 struct nfs_page *req, u64 wb_size) 2674 { 2675 pnfs_generic_pg_check_layout(pgio); 2676 pnfs_generic_pg_check_range(pgio, req); 2677 if (pgio->pg_lseg == NULL) { 2678 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 2679 nfs_req_openctx(req), 2680 req_offset(req), 2681 wb_size, 2682 IOMODE_RW, 2683 false, 2684 GFP_KERNEL); 2685 if (IS_ERR(pgio->pg_lseg)) { 2686 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2687 pgio->pg_lseg = NULL; 2688 return; 2689 } 2690 } 2691 /* If no lseg, fall back to write through mds */ 2692 if (pgio->pg_lseg == NULL) 2693 nfs_pageio_reset_write_mds(pgio); 2694 } 2695 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); 2696 2697 void 2698 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) 2699 { 2700 if (desc->pg_lseg) { 2701 pnfs_put_lseg(desc->pg_lseg); 2702 desc->pg_lseg = NULL; 2703 } 2704 } 2705 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); 2706 2707 /* 2708 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 2709 * of bytes (maximum @req->wb_bytes) that can be coalesced. 2710 */ 2711 size_t 2712 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 2713 struct nfs_page *prev, struct nfs_page *req) 2714 { 2715 unsigned int size; 2716 u64 seg_end, req_start, seg_left; 2717 2718 size = nfs_generic_pg_test(pgio, prev, req); 2719 if (!size) 2720 return 0; 2721 2722 /* 2723 * 'size' contains the number of bytes left in the current page (up 2724 * to the original size asked for in @req->wb_bytes). 2725 * 2726 * Calculate how many bytes are left in the layout segment 2727 * and if there are less bytes than 'size', return that instead. 2728 * 2729 * Please also note that 'end_offset' is actually the offset of the 2730 * first byte that lies outside the pnfs_layout_range. FIXME? 2731 * 2732 */ 2733 if (pgio->pg_lseg) { 2734 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset, 2735 pgio->pg_lseg->pls_range.length); 2736 req_start = req_offset(req); 2737 2738 /* start of request is past the last byte of this segment */ 2739 if (req_start >= seg_end) 2740 return 0; 2741 2742 /* adjust 'size' iff there are fewer bytes left in the 2743 * segment than what nfs_generic_pg_test returned */ 2744 seg_left = seg_end - req_start; 2745 if (seg_left < size) 2746 size = (unsigned int)seg_left; 2747 } 2748 2749 return size; 2750 } 2751 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); 2752 2753 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) 2754 { 2755 struct nfs_pageio_descriptor pgio; 2756 2757 /* Resend all requests through the MDS */ 2758 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, 2759 hdr->completion_ops); 2760 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags); 2761 return nfs_pageio_resend(&pgio, hdr); 2762 } 2763 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); 2764 2765 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) 2766 { 2767 2768 dprintk("pnfs write error = %d\n", hdr->pnfs_error); 2769 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2770 PNFS_LAYOUTRET_ON_ERROR) { 2771 pnfs_return_layout(hdr->inode); 2772 } 2773 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2774 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); 2775 } 2776 2777 /* 2778 * Called by non rpc-based layout drivers 2779 */ 2780 void pnfs_ld_write_done(struct nfs_pgio_header *hdr) 2781 { 2782 if (likely(!hdr->pnfs_error)) { 2783 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, 2784 hdr->mds_offset + hdr->res.count); 2785 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2786 } 2787 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); 2788 if (unlikely(hdr->pnfs_error)) 2789 pnfs_ld_handle_write_error(hdr); 2790 hdr->mds_ops->rpc_release(hdr); 2791 } 2792 EXPORT_SYMBOL_GPL(pnfs_ld_write_done); 2793 2794 static void 2795 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, 2796 struct nfs_pgio_header *hdr) 2797 { 2798 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2799 2800 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2801 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2802 nfs_pageio_reset_write_mds(desc); 2803 mirror->pg_recoalesce = 1; 2804 } 2805 hdr->completion_ops->completion(hdr); 2806 } 2807 2808 static enum pnfs_try_status 2809 pnfs_try_to_write_data(struct nfs_pgio_header *hdr, 2810 const struct rpc_call_ops *call_ops, 2811 struct pnfs_layout_segment *lseg, 2812 int how) 2813 { 2814 struct inode *inode = hdr->inode; 2815 enum pnfs_try_status trypnfs; 2816 struct nfs_server *nfss = NFS_SERVER(inode); 2817 2818 hdr->mds_ops = call_ops; 2819 2820 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, 2821 inode->i_ino, hdr->args.count, hdr->args.offset, how); 2822 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); 2823 if (trypnfs != PNFS_NOT_ATTEMPTED) 2824 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); 2825 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2826 return trypnfs; 2827 } 2828 2829 static void 2830 pnfs_do_write(struct nfs_pageio_descriptor *desc, 2831 struct nfs_pgio_header *hdr, int how) 2832 { 2833 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2834 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2835 enum pnfs_try_status trypnfs; 2836 2837 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); 2838 switch (trypnfs) { 2839 case PNFS_NOT_ATTEMPTED: 2840 pnfs_write_through_mds(desc, hdr); 2841 case PNFS_ATTEMPTED: 2842 break; 2843 case PNFS_TRY_AGAIN: 2844 /* cleanup hdr and prepare to redo pnfs */ 2845 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2846 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2847 list_splice_init(&hdr->pages, &mirror->pg_list); 2848 mirror->pg_recoalesce = 1; 2849 } 2850 hdr->mds_ops->rpc_release(hdr); 2851 } 2852 } 2853 2854 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) 2855 { 2856 pnfs_put_lseg(hdr->lseg); 2857 nfs_pgio_header_free(hdr); 2858 } 2859 2860 int 2861 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 2862 { 2863 struct nfs_pgio_header *hdr; 2864 int ret; 2865 2866 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2867 if (!hdr) { 2868 desc->pg_error = -ENOMEM; 2869 return desc->pg_error; 2870 } 2871 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); 2872 2873 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 2874 ret = nfs_generic_pgio(desc, hdr); 2875 if (!ret) 2876 pnfs_do_write(desc, hdr, desc->pg_ioflags); 2877 2878 return ret; 2879 } 2880 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); 2881 2882 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) 2883 { 2884 struct nfs_pageio_descriptor pgio; 2885 2886 /* Resend all requests through the MDS */ 2887 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); 2888 return nfs_pageio_resend(&pgio, hdr); 2889 } 2890 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); 2891 2892 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) 2893 { 2894 dprintk("pnfs read error = %d\n", hdr->pnfs_error); 2895 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2896 PNFS_LAYOUTRET_ON_ERROR) { 2897 pnfs_return_layout(hdr->inode); 2898 } 2899 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2900 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); 2901 } 2902 2903 /* 2904 * Called by non rpc-based layout drivers 2905 */ 2906 void pnfs_ld_read_done(struct nfs_pgio_header *hdr) 2907 { 2908 if (likely(!hdr->pnfs_error)) 2909 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2910 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); 2911 if (unlikely(hdr->pnfs_error)) 2912 pnfs_ld_handle_read_error(hdr); 2913 hdr->mds_ops->rpc_release(hdr); 2914 } 2915 EXPORT_SYMBOL_GPL(pnfs_ld_read_done); 2916 2917 static void 2918 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, 2919 struct nfs_pgio_header *hdr) 2920 { 2921 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2922 2923 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2924 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2925 nfs_pageio_reset_read_mds(desc); 2926 mirror->pg_recoalesce = 1; 2927 } 2928 hdr->completion_ops->completion(hdr); 2929 } 2930 2931 /* 2932 * Call the appropriate parallel I/O subsystem read function. 2933 */ 2934 static enum pnfs_try_status 2935 pnfs_try_to_read_data(struct nfs_pgio_header *hdr, 2936 const struct rpc_call_ops *call_ops, 2937 struct pnfs_layout_segment *lseg) 2938 { 2939 struct inode *inode = hdr->inode; 2940 struct nfs_server *nfss = NFS_SERVER(inode); 2941 enum pnfs_try_status trypnfs; 2942 2943 hdr->mds_ops = call_ops; 2944 2945 dprintk("%s: Reading ino:%lu %u@%llu\n", 2946 __func__, inode->i_ino, hdr->args.count, hdr->args.offset); 2947 2948 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); 2949 if (trypnfs != PNFS_NOT_ATTEMPTED) 2950 nfs_inc_stats(inode, NFSIOS_PNFS_READ); 2951 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2952 return trypnfs; 2953 } 2954 2955 /* Resend all requests through pnfs. */ 2956 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr) 2957 { 2958 struct nfs_pageio_descriptor pgio; 2959 2960 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2961 /* Prevent deadlocks with layoutreturn! */ 2962 pnfs_put_lseg(hdr->lseg); 2963 hdr->lseg = NULL; 2964 2965 nfs_pageio_init_read(&pgio, hdr->inode, false, 2966 hdr->completion_ops); 2967 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr); 2968 } 2969 } 2970 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); 2971 2972 static void 2973 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) 2974 { 2975 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2976 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2977 enum pnfs_try_status trypnfs; 2978 2979 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); 2980 switch (trypnfs) { 2981 case PNFS_NOT_ATTEMPTED: 2982 pnfs_read_through_mds(desc, hdr); 2983 case PNFS_ATTEMPTED: 2984 break; 2985 case PNFS_TRY_AGAIN: 2986 /* cleanup hdr and prepare to redo pnfs */ 2987 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2988 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2989 list_splice_init(&hdr->pages, &mirror->pg_list); 2990 mirror->pg_recoalesce = 1; 2991 } 2992 hdr->mds_ops->rpc_release(hdr); 2993 } 2994 } 2995 2996 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) 2997 { 2998 pnfs_put_lseg(hdr->lseg); 2999 nfs_pgio_header_free(hdr); 3000 } 3001 3002 int 3003 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) 3004 { 3005 struct nfs_pgio_header *hdr; 3006 int ret; 3007 3008 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 3009 if (!hdr) { 3010 desc->pg_error = -ENOMEM; 3011 return desc->pg_error; 3012 } 3013 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); 3014 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 3015 ret = nfs_generic_pgio(desc, hdr); 3016 if (!ret) 3017 pnfs_do_read(desc, hdr); 3018 return ret; 3019 } 3020 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); 3021 3022 static void pnfs_clear_layoutcommitting(struct inode *inode) 3023 { 3024 unsigned long *bitlock = &NFS_I(inode)->flags; 3025 3026 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 3027 smp_mb__after_atomic(); 3028 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 3029 } 3030 3031 /* 3032 * There can be multiple RW segments. 3033 */ 3034 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 3035 { 3036 struct pnfs_layout_segment *lseg; 3037 3038 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { 3039 if (lseg->pls_range.iomode == IOMODE_RW && 3040 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 3041 list_add(&lseg->pls_lc_list, listp); 3042 } 3043 } 3044 3045 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) 3046 { 3047 struct pnfs_layout_segment *lseg, *tmp; 3048 3049 /* Matched by references in pnfs_set_layoutcommit */ 3050 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { 3051 list_del_init(&lseg->pls_lc_list); 3052 pnfs_put_lseg(lseg); 3053 } 3054 3055 pnfs_clear_layoutcommitting(inode); 3056 } 3057 3058 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) 3059 { 3060 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); 3061 } 3062 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); 3063 3064 void 3065 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, 3066 loff_t end_pos) 3067 { 3068 struct nfs_inode *nfsi = NFS_I(inode); 3069 bool mark_as_dirty = false; 3070 3071 spin_lock(&inode->i_lock); 3072 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 3073 nfsi->layout->plh_lwb = end_pos; 3074 mark_as_dirty = true; 3075 dprintk("%s: Set layoutcommit for inode %lu ", 3076 __func__, inode->i_ino); 3077 } else if (end_pos > nfsi->layout->plh_lwb) 3078 nfsi->layout->plh_lwb = end_pos; 3079 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { 3080 /* references matched in nfs4_layoutcommit_release */ 3081 pnfs_get_lseg(lseg); 3082 } 3083 spin_unlock(&inode->i_lock); 3084 dprintk("%s: lseg %p end_pos %llu\n", 3085 __func__, lseg, nfsi->layout->plh_lwb); 3086 3087 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one 3088 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ 3089 if (mark_as_dirty) 3090 mark_inode_dirty_sync(inode); 3091 } 3092 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); 3093 3094 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 3095 { 3096 struct nfs_server *nfss = NFS_SERVER(data->args.inode); 3097 3098 if (nfss->pnfs_curr_ld->cleanup_layoutcommit) 3099 nfss->pnfs_curr_ld->cleanup_layoutcommit(data); 3100 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); 3101 } 3102 3103 /* 3104 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and 3105 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough 3106 * data to disk to allow the server to recover the data if it crashes. 3107 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag 3108 * is off, and a COMMIT is sent to a data server, or 3109 * if WRITEs to a data server return NFS_DATA_SYNC. 3110 */ 3111 int 3112 pnfs_layoutcommit_inode(struct inode *inode, bool sync) 3113 { 3114 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 3115 struct nfs4_layoutcommit_data *data; 3116 struct nfs_inode *nfsi = NFS_I(inode); 3117 loff_t end_pos; 3118 int status; 3119 3120 if (!pnfs_layoutcommit_outstanding(inode)) 3121 return 0; 3122 3123 dprintk("--> %s inode %lu\n", __func__, inode->i_ino); 3124 3125 status = -EAGAIN; 3126 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { 3127 if (!sync) 3128 goto out; 3129 status = wait_on_bit_lock_action(&nfsi->flags, 3130 NFS_INO_LAYOUTCOMMITTING, 3131 nfs_wait_bit_killable, 3132 TASK_KILLABLE); 3133 if (status) 3134 goto out; 3135 } 3136 3137 status = -ENOMEM; 3138 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ 3139 data = kzalloc(sizeof(*data), GFP_NOFS); 3140 if (!data) 3141 goto clear_layoutcommitting; 3142 3143 status = 0; 3144 spin_lock(&inode->i_lock); 3145 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 3146 goto out_unlock; 3147 3148 INIT_LIST_HEAD(&data->lseg_list); 3149 pnfs_list_write_lseg(inode, &data->lseg_list); 3150 3151 end_pos = nfsi->layout->plh_lwb; 3152 3153 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); 3154 data->cred = get_cred(nfsi->layout->plh_lc_cred); 3155 spin_unlock(&inode->i_lock); 3156 3157 data->args.inode = inode; 3158 nfs_fattr_init(&data->fattr); 3159 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3160 data->res.fattr = &data->fattr; 3161 if (end_pos != 0) 3162 data->args.lastbytewritten = end_pos - 1; 3163 else 3164 data->args.lastbytewritten = U64_MAX; 3165 data->res.server = NFS_SERVER(inode); 3166 3167 if (ld->prepare_layoutcommit) { 3168 status = ld->prepare_layoutcommit(&data->args); 3169 if (status) { 3170 put_cred(data->cred); 3171 spin_lock(&inode->i_lock); 3172 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); 3173 if (end_pos > nfsi->layout->plh_lwb) 3174 nfsi->layout->plh_lwb = end_pos; 3175 goto out_unlock; 3176 } 3177 } 3178 3179 3180 status = nfs4_proc_layoutcommit(data, sync); 3181 out: 3182 if (status) 3183 mark_inode_dirty_sync(inode); 3184 dprintk("<-- %s status %d\n", __func__, status); 3185 return status; 3186 out_unlock: 3187 spin_unlock(&inode->i_lock); 3188 kfree(data); 3189 clear_layoutcommitting: 3190 pnfs_clear_layoutcommitting(inode); 3191 goto out; 3192 } 3193 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); 3194 3195 int 3196 pnfs_generic_sync(struct inode *inode, bool datasync) 3197 { 3198 return pnfs_layoutcommit_inode(inode, true); 3199 } 3200 EXPORT_SYMBOL_GPL(pnfs_generic_sync); 3201 3202 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 3203 { 3204 struct nfs4_threshold *thp; 3205 3206 thp = kzalloc(sizeof(*thp), GFP_NOFS); 3207 if (!thp) { 3208 dprintk("%s mdsthreshold allocation failed\n", __func__); 3209 return NULL; 3210 } 3211 return thp; 3212 } 3213 3214 #if IS_ENABLED(CONFIG_NFS_V4_2) 3215 int 3216 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 3217 { 3218 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 3219 struct nfs_server *server = NFS_SERVER(inode); 3220 struct nfs_inode *nfsi = NFS_I(inode); 3221 struct nfs42_layoutstat_data *data; 3222 struct pnfs_layout_hdr *hdr; 3223 int status = 0; 3224 3225 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) 3226 goto out; 3227 3228 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) 3229 goto out; 3230 3231 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) 3232 goto out; 3233 3234 spin_lock(&inode->i_lock); 3235 if (!NFS_I(inode)->layout) { 3236 spin_unlock(&inode->i_lock); 3237 goto out_clear_layoutstats; 3238 } 3239 hdr = NFS_I(inode)->layout; 3240 pnfs_get_layout_hdr(hdr); 3241 spin_unlock(&inode->i_lock); 3242 3243 data = kzalloc(sizeof(*data), gfp_flags); 3244 if (!data) { 3245 status = -ENOMEM; 3246 goto out_put; 3247 } 3248 3249 data->args.fh = NFS_FH(inode); 3250 data->args.inode = inode; 3251 status = ld->prepare_layoutstats(&data->args); 3252 if (status) 3253 goto out_free; 3254 3255 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); 3256 3257 out: 3258 dprintk("%s returns %d\n", __func__, status); 3259 return status; 3260 3261 out_free: 3262 kfree(data); 3263 out_put: 3264 pnfs_put_layout_hdr(hdr); 3265 out_clear_layoutstats: 3266 smp_mb__before_atomic(); 3267 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); 3268 smp_mb__after_atomic(); 3269 goto out; 3270 } 3271 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); 3272 #endif 3273 3274 unsigned int layoutstats_timer; 3275 module_param(layoutstats_timer, uint, 0644); 3276 EXPORT_SYMBOL_GPL(layoutstats_timer); 3277