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 manager 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 static bool 1230 pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo, 1231 enum pnfs_iomode iomode, 1232 u32 seq) 1233 { 1234 struct pnfs_layout_range recall_range = { 1235 .length = NFS4_MAX_UINT64, 1236 .iomode = iomode, 1237 }; 1238 return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, 1239 &recall_range, seq) != -EBUSY; 1240 } 1241 1242 /* Return true if layoutreturn is needed */ 1243 static bool 1244 pnfs_layout_need_return(struct pnfs_layout_hdr *lo) 1245 { 1246 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1247 return false; 1248 return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode, 1249 lo->plh_return_seq); 1250 } 1251 1252 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo) 1253 { 1254 struct inode *inode= lo->plh_inode; 1255 1256 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1257 return; 1258 spin_lock(&inode->i_lock); 1259 if (pnfs_layout_need_return(lo)) { 1260 const struct cred *cred; 1261 nfs4_stateid stateid; 1262 enum pnfs_iomode iomode; 1263 bool send; 1264 1265 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); 1266 spin_unlock(&inode->i_lock); 1267 if (send) { 1268 /* Send an async layoutreturn so we dont deadlock */ 1269 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false); 1270 } 1271 } else 1272 spin_unlock(&inode->i_lock); 1273 } 1274 1275 /* 1276 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr 1277 * when the layout segment list is empty. 1278 * 1279 * Note that a pnfs_layout_hdr can exist with an empty layout segment 1280 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the 1281 * deviceid is marked invalid. 1282 */ 1283 int 1284 _pnfs_return_layout(struct inode *ino) 1285 { 1286 struct pnfs_layout_hdr *lo = NULL; 1287 struct nfs_inode *nfsi = NFS_I(ino); 1288 LIST_HEAD(tmp_list); 1289 const struct cred *cred; 1290 nfs4_stateid stateid; 1291 int status = 0; 1292 bool send, valid_layout; 1293 1294 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); 1295 1296 spin_lock(&ino->i_lock); 1297 lo = nfsi->layout; 1298 if (!lo) { 1299 spin_unlock(&ino->i_lock); 1300 dprintk("NFS: %s no layout to return\n", __func__); 1301 goto out; 1302 } 1303 /* Reference matched in nfs4_layoutreturn_release */ 1304 pnfs_get_layout_hdr(lo); 1305 /* Is there an outstanding layoutreturn ? */ 1306 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1307 spin_unlock(&ino->i_lock); 1308 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1309 TASK_UNINTERRUPTIBLE)) 1310 goto out_put_layout_hdr; 1311 spin_lock(&ino->i_lock); 1312 } 1313 valid_layout = pnfs_layout_is_valid(lo); 1314 pnfs_clear_layoutcommit(ino, &tmp_list); 1315 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0); 1316 1317 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 1318 struct pnfs_layout_range range = { 1319 .iomode = IOMODE_ANY, 1320 .offset = 0, 1321 .length = NFS4_MAX_UINT64, 1322 }; 1323 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); 1324 } 1325 1326 /* Don't send a LAYOUTRETURN if list was initially empty */ 1327 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) || 1328 !valid_layout) { 1329 spin_unlock(&ino->i_lock); 1330 dprintk("NFS: %s no layout segments to return\n", __func__); 1331 goto out_wait_layoutreturn; 1332 } 1333 1334 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL); 1335 spin_unlock(&ino->i_lock); 1336 if (send) 1337 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true); 1338 out_wait_layoutreturn: 1339 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE); 1340 out_put_layout_hdr: 1341 pnfs_free_lseg_list(&tmp_list); 1342 pnfs_put_layout_hdr(lo); 1343 out: 1344 dprintk("<-- %s status: %d\n", __func__, status); 1345 return status; 1346 } 1347 1348 int 1349 pnfs_commit_and_return_layout(struct inode *inode) 1350 { 1351 struct pnfs_layout_hdr *lo; 1352 int ret; 1353 1354 spin_lock(&inode->i_lock); 1355 lo = NFS_I(inode)->layout; 1356 if (lo == NULL) { 1357 spin_unlock(&inode->i_lock); 1358 return 0; 1359 } 1360 pnfs_get_layout_hdr(lo); 1361 /* Block new layoutgets and read/write to ds */ 1362 lo->plh_block_lgets++; 1363 spin_unlock(&inode->i_lock); 1364 filemap_fdatawait(inode->i_mapping); 1365 ret = pnfs_layoutcommit_inode(inode, true); 1366 if (ret == 0) 1367 ret = _pnfs_return_layout(inode); 1368 spin_lock(&inode->i_lock); 1369 lo->plh_block_lgets--; 1370 spin_unlock(&inode->i_lock); 1371 pnfs_put_layout_hdr(lo); 1372 return ret; 1373 } 1374 1375 bool pnfs_roc(struct inode *ino, 1376 struct nfs4_layoutreturn_args *args, 1377 struct nfs4_layoutreturn_res *res, 1378 const struct cred *cred) 1379 { 1380 struct nfs_inode *nfsi = NFS_I(ino); 1381 struct nfs_open_context *ctx; 1382 struct nfs4_state *state; 1383 struct pnfs_layout_hdr *lo; 1384 struct pnfs_layout_segment *lseg, *next; 1385 const struct cred *lc_cred; 1386 nfs4_stateid stateid; 1387 enum pnfs_iomode iomode = 0; 1388 bool layoutreturn = false, roc = false; 1389 bool skip_read = false; 1390 1391 if (!nfs_have_layout(ino)) 1392 return false; 1393 retry: 1394 rcu_read_lock(); 1395 spin_lock(&ino->i_lock); 1396 lo = nfsi->layout; 1397 if (!lo || !pnfs_layout_is_valid(lo) || 1398 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1399 lo = NULL; 1400 goto out_noroc; 1401 } 1402 pnfs_get_layout_hdr(lo); 1403 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1404 spin_unlock(&ino->i_lock); 1405 rcu_read_unlock(); 1406 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1407 TASK_UNINTERRUPTIBLE); 1408 pnfs_put_layout_hdr(lo); 1409 goto retry; 1410 } 1411 1412 /* no roc if we hold a delegation */ 1413 if (nfs4_check_delegation(ino, FMODE_READ)) { 1414 if (nfs4_check_delegation(ino, FMODE_WRITE)) 1415 goto out_noroc; 1416 skip_read = true; 1417 } 1418 1419 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 1420 state = ctx->state; 1421 if (state == NULL) 1422 continue; 1423 /* Don't return layout if there is open file state */ 1424 if (state->state & FMODE_WRITE) 1425 goto out_noroc; 1426 if (state->state & FMODE_READ) 1427 skip_read = true; 1428 } 1429 1430 1431 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) { 1432 if (skip_read && lseg->pls_range.iomode == IOMODE_READ) 1433 continue; 1434 /* If we are sending layoutreturn, invalidate all valid lsegs */ 1435 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags)) 1436 continue; 1437 /* 1438 * Note: mark lseg for return so pnfs_layout_remove_lseg 1439 * doesn't invalidate the layout for us. 1440 */ 1441 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 1442 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs)) 1443 continue; 1444 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 1445 } 1446 1447 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1448 goto out_noroc; 1449 1450 /* ROC in two conditions: 1451 * 1. there are ROC lsegs 1452 * 2. we don't send layoutreturn 1453 */ 1454 /* lo ref dropped in pnfs_roc_release() */ 1455 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode); 1456 /* If the creds don't match, we can't compound the layoutreturn */ 1457 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0) 1458 goto out_noroc; 1459 1460 roc = layoutreturn; 1461 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode); 1462 res->lrs_present = 0; 1463 layoutreturn = false; 1464 put_cred(lc_cred); 1465 1466 out_noroc: 1467 spin_unlock(&ino->i_lock); 1468 rcu_read_unlock(); 1469 pnfs_layoutcommit_inode(ino, true); 1470 if (roc) { 1471 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1472 if (ld->prepare_layoutreturn) 1473 ld->prepare_layoutreturn(args); 1474 pnfs_put_layout_hdr(lo); 1475 return true; 1476 } 1477 if (layoutreturn) 1478 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, true); 1479 pnfs_put_layout_hdr(lo); 1480 return false; 1481 } 1482 1483 int pnfs_roc_done(struct rpc_task *task, struct inode *inode, 1484 struct nfs4_layoutreturn_args **argpp, 1485 struct nfs4_layoutreturn_res **respp, 1486 int *ret) 1487 { 1488 struct nfs4_layoutreturn_args *arg = *argpp; 1489 int retval = -EAGAIN; 1490 1491 if (!arg) 1492 return 0; 1493 /* Handle Layoutreturn errors */ 1494 switch (*ret) { 1495 case 0: 1496 retval = 0; 1497 break; 1498 case -NFS4ERR_NOMATCHING_LAYOUT: 1499 /* Was there an RPC level error? If not, retry */ 1500 if (task->tk_rpc_status == 0) 1501 break; 1502 /* If the call was not sent, let caller handle it */ 1503 if (!RPC_WAS_SENT(task)) 1504 return 0; 1505 /* 1506 * Otherwise, assume the call succeeded and 1507 * that we need to release the layout 1508 */ 1509 *ret = 0; 1510 (*respp)->lrs_present = 0; 1511 retval = 0; 1512 break; 1513 case -NFS4ERR_DELAY: 1514 /* Let the caller handle the retry */ 1515 *ret = -NFS4ERR_NOMATCHING_LAYOUT; 1516 return 0; 1517 case -NFS4ERR_OLD_STATEID: 1518 if (!nfs4_layout_refresh_old_stateid(&arg->stateid, 1519 &arg->range, inode)) 1520 break; 1521 *ret = -NFS4ERR_NOMATCHING_LAYOUT; 1522 return -EAGAIN; 1523 } 1524 *argpp = NULL; 1525 *respp = NULL; 1526 return retval; 1527 } 1528 1529 void pnfs_roc_release(struct nfs4_layoutreturn_args *args, 1530 struct nfs4_layoutreturn_res *res, 1531 int ret) 1532 { 1533 struct pnfs_layout_hdr *lo = args->layout; 1534 const nfs4_stateid *arg_stateid = NULL; 1535 const nfs4_stateid *res_stateid = NULL; 1536 struct nfs4_xdr_opaque_data *ld_private = args->ld_private; 1537 1538 switch (ret) { 1539 case -NFS4ERR_NOMATCHING_LAYOUT: 1540 break; 1541 case 0: 1542 if (res->lrs_present) 1543 res_stateid = &res->stateid; 1544 fallthrough; 1545 default: 1546 arg_stateid = &args->stateid; 1547 } 1548 trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret); 1549 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range, 1550 res_stateid); 1551 if (ld_private && ld_private->ops && ld_private->ops->free) 1552 ld_private->ops->free(ld_private); 1553 pnfs_put_layout_hdr(lo); 1554 } 1555 1556 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) 1557 { 1558 struct nfs_inode *nfsi = NFS_I(ino); 1559 struct pnfs_layout_hdr *lo; 1560 bool sleep = false; 1561 1562 /* we might not have grabbed lo reference. so need to check under 1563 * i_lock */ 1564 spin_lock(&ino->i_lock); 1565 lo = nfsi->layout; 1566 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1567 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1568 sleep = true; 1569 } 1570 spin_unlock(&ino->i_lock); 1571 return sleep; 1572 } 1573 1574 /* 1575 * Compare two layout segments for sorting into layout cache. 1576 * We want to preferentially return RW over RO layouts, so ensure those 1577 * are seen first. 1578 */ 1579 static s64 1580 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, 1581 const struct pnfs_layout_range *l2) 1582 { 1583 s64 d; 1584 1585 /* high offset > low offset */ 1586 d = l1->offset - l2->offset; 1587 if (d) 1588 return d; 1589 1590 /* short length > long length */ 1591 d = l2->length - l1->length; 1592 if (d) 1593 return d; 1594 1595 /* read > read/write */ 1596 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); 1597 } 1598 1599 static bool 1600 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1, 1601 const struct pnfs_layout_range *l2) 1602 { 1603 return pnfs_lseg_range_cmp(l1, l2) > 0; 1604 } 1605 1606 static bool 1607 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg, 1608 struct pnfs_layout_segment *old) 1609 { 1610 return false; 1611 } 1612 1613 void 1614 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1615 struct pnfs_layout_segment *lseg, 1616 bool (*is_after)(const struct pnfs_layout_range *, 1617 const struct pnfs_layout_range *), 1618 bool (*do_merge)(struct pnfs_layout_segment *, 1619 struct pnfs_layout_segment *), 1620 struct list_head *free_me) 1621 { 1622 struct pnfs_layout_segment *lp, *tmp; 1623 1624 dprintk("%s:Begin\n", __func__); 1625 1626 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) { 1627 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0) 1628 continue; 1629 if (do_merge(lseg, lp)) { 1630 mark_lseg_invalid(lp, free_me); 1631 continue; 1632 } 1633 if (is_after(&lseg->pls_range, &lp->pls_range)) 1634 continue; 1635 list_add_tail(&lseg->pls_list, &lp->pls_list); 1636 dprintk("%s: inserted lseg %p " 1637 "iomode %d offset %llu length %llu before " 1638 "lp %p iomode %d offset %llu length %llu\n", 1639 __func__, lseg, lseg->pls_range.iomode, 1640 lseg->pls_range.offset, lseg->pls_range.length, 1641 lp, lp->pls_range.iomode, lp->pls_range.offset, 1642 lp->pls_range.length); 1643 goto out; 1644 } 1645 list_add_tail(&lseg->pls_list, &lo->plh_segs); 1646 dprintk("%s: inserted lseg %p " 1647 "iomode %d offset %llu length %llu at tail\n", 1648 __func__, lseg, lseg->pls_range.iomode, 1649 lseg->pls_range.offset, lseg->pls_range.length); 1650 out: 1651 pnfs_get_layout_hdr(lo); 1652 1653 dprintk("%s:Return\n", __func__); 1654 } 1655 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg); 1656 1657 static void 1658 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1659 struct pnfs_layout_segment *lseg, 1660 struct list_head *free_me) 1661 { 1662 struct inode *inode = lo->plh_inode; 1663 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 1664 1665 if (ld->add_lseg != NULL) 1666 ld->add_lseg(lo, lseg, free_me); 1667 else 1668 pnfs_generic_layout_insert_lseg(lo, lseg, 1669 pnfs_lseg_range_is_after, 1670 pnfs_lseg_no_merge, 1671 free_me); 1672 } 1673 1674 static struct pnfs_layout_hdr * 1675 alloc_init_layout_hdr(struct inode *ino, 1676 struct nfs_open_context *ctx, 1677 gfp_t gfp_flags) 1678 { 1679 struct pnfs_layout_hdr *lo; 1680 1681 lo = pnfs_alloc_layout_hdr(ino, gfp_flags); 1682 if (!lo) 1683 return NULL; 1684 refcount_set(&lo->plh_refcount, 1); 1685 INIT_LIST_HEAD(&lo->plh_layouts); 1686 INIT_LIST_HEAD(&lo->plh_segs); 1687 INIT_LIST_HEAD(&lo->plh_return_segs); 1688 INIT_LIST_HEAD(&lo->plh_bulk_destroy); 1689 lo->plh_inode = ino; 1690 lo->plh_lc_cred = get_cred(ctx->cred); 1691 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID; 1692 return lo; 1693 } 1694 1695 static struct pnfs_layout_hdr * 1696 pnfs_find_alloc_layout(struct inode *ino, 1697 struct nfs_open_context *ctx, 1698 gfp_t gfp_flags) 1699 __releases(&ino->i_lock) 1700 __acquires(&ino->i_lock) 1701 { 1702 struct nfs_inode *nfsi = NFS_I(ino); 1703 struct pnfs_layout_hdr *new = NULL; 1704 1705 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); 1706 1707 if (nfsi->layout != NULL) 1708 goto out_existing; 1709 spin_unlock(&ino->i_lock); 1710 new = alloc_init_layout_hdr(ino, ctx, gfp_flags); 1711 spin_lock(&ino->i_lock); 1712 1713 if (likely(nfsi->layout == NULL)) { /* Won the race? */ 1714 nfsi->layout = new; 1715 return new; 1716 } else if (new != NULL) 1717 pnfs_free_layout_hdr(new); 1718 out_existing: 1719 pnfs_get_layout_hdr(nfsi->layout); 1720 return nfsi->layout; 1721 } 1722 1723 /* 1724 * iomode matching rules: 1725 * iomode lseg strict match 1726 * iomode 1727 * ----- ----- ------ ----- 1728 * ANY READ N/A true 1729 * ANY RW N/A true 1730 * RW READ N/A false 1731 * RW RW N/A true 1732 * READ READ N/A true 1733 * READ RW true false 1734 * READ RW false true 1735 */ 1736 static bool 1737 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, 1738 const struct pnfs_layout_range *range, 1739 bool strict_iomode) 1740 { 1741 struct pnfs_layout_range range1; 1742 1743 if ((range->iomode == IOMODE_RW && 1744 ls_range->iomode != IOMODE_RW) || 1745 (range->iomode != ls_range->iomode && 1746 strict_iomode) || 1747 !pnfs_lseg_range_intersecting(ls_range, range)) 1748 return false; 1749 1750 /* range1 covers only the first byte in the range */ 1751 range1 = *range; 1752 range1.length = 1; 1753 return pnfs_lseg_range_contained(ls_range, &range1); 1754 } 1755 1756 /* 1757 * lookup range in layout 1758 */ 1759 static struct pnfs_layout_segment * 1760 pnfs_find_lseg(struct pnfs_layout_hdr *lo, 1761 struct pnfs_layout_range *range, 1762 bool strict_iomode) 1763 { 1764 struct pnfs_layout_segment *lseg, *ret = NULL; 1765 1766 dprintk("%s:Begin\n", __func__); 1767 1768 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 1769 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && 1770 pnfs_lseg_range_match(&lseg->pls_range, range, 1771 strict_iomode)) { 1772 ret = pnfs_get_lseg(lseg); 1773 break; 1774 } 1775 } 1776 1777 dprintk("%s:Return lseg %p ref %d\n", 1778 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0); 1779 return ret; 1780 } 1781 1782 /* 1783 * Use mdsthreshold hints set at each OPEN to determine if I/O should go 1784 * to the MDS or over pNFS 1785 * 1786 * The nfs_inode read_io and write_io fields are cumulative counters reset 1787 * when there are no layout segments. Note that in pnfs_update_layout iomode 1788 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a 1789 * WRITE request. 1790 * 1791 * A return of true means use MDS I/O. 1792 * 1793 * From rfc 5661: 1794 * If a file's size is smaller than the file size threshold, data accesses 1795 * SHOULD be sent to the metadata server. If an I/O request has a length that 1796 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata 1797 * server. If both file size and I/O size are provided, the client SHOULD 1798 * reach or exceed both thresholds before sending its read or write 1799 * requests to the data server. 1800 */ 1801 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, 1802 struct inode *ino, int iomode) 1803 { 1804 struct nfs4_threshold *t = ctx->mdsthreshold; 1805 struct nfs_inode *nfsi = NFS_I(ino); 1806 loff_t fsize = i_size_read(ino); 1807 bool size = false, size_set = false, io = false, io_set = false, ret = false; 1808 1809 if (t == NULL) 1810 return ret; 1811 1812 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", 1813 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); 1814 1815 switch (iomode) { 1816 case IOMODE_READ: 1817 if (t->bm & THRESHOLD_RD) { 1818 dprintk("%s fsize %llu\n", __func__, fsize); 1819 size_set = true; 1820 if (fsize < t->rd_sz) 1821 size = true; 1822 } 1823 if (t->bm & THRESHOLD_RD_IO) { 1824 dprintk("%s nfsi->read_io %llu\n", __func__, 1825 nfsi->read_io); 1826 io_set = true; 1827 if (nfsi->read_io < t->rd_io_sz) 1828 io = true; 1829 } 1830 break; 1831 case IOMODE_RW: 1832 if (t->bm & THRESHOLD_WR) { 1833 dprintk("%s fsize %llu\n", __func__, fsize); 1834 size_set = true; 1835 if (fsize < t->wr_sz) 1836 size = true; 1837 } 1838 if (t->bm & THRESHOLD_WR_IO) { 1839 dprintk("%s nfsi->write_io %llu\n", __func__, 1840 nfsi->write_io); 1841 io_set = true; 1842 if (nfsi->write_io < t->wr_io_sz) 1843 io = true; 1844 } 1845 break; 1846 } 1847 if (size_set && io_set) { 1848 if (size && io) 1849 ret = true; 1850 } else if (size || io) 1851 ret = true; 1852 1853 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); 1854 return ret; 1855 } 1856 1857 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) 1858 { 1859 /* 1860 * send layoutcommit as it can hold up layoutreturn due to lseg 1861 * reference 1862 */ 1863 pnfs_layoutcommit_inode(lo->plh_inode, false); 1864 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, 1865 nfs_wait_bit_killable, 1866 TASK_KILLABLE); 1867 } 1868 1869 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo) 1870 { 1871 atomic_inc(&lo->plh_outstanding); 1872 } 1873 1874 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo) 1875 { 1876 if (atomic_dec_and_test(&lo->plh_outstanding)) 1877 wake_up_var(&lo->plh_outstanding); 1878 } 1879 1880 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) 1881 { 1882 unsigned long *bitlock = &lo->plh_flags; 1883 1884 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); 1885 smp_mb__after_atomic(); 1886 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); 1887 } 1888 1889 static void _add_to_server_list(struct pnfs_layout_hdr *lo, 1890 struct nfs_server *server) 1891 { 1892 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) { 1893 struct nfs_client *clp = server->nfs_client; 1894 1895 /* The lo must be on the clp list if there is any 1896 * chance of a CB_LAYOUTRECALL(FILE) coming in. 1897 */ 1898 spin_lock(&clp->cl_lock); 1899 list_add_tail_rcu(&lo->plh_layouts, &server->layouts); 1900 spin_unlock(&clp->cl_lock); 1901 } 1902 } 1903 1904 /* 1905 * Layout segment is retreived from the server if not cached. 1906 * The appropriate layout segment is referenced and returned to the caller. 1907 */ 1908 struct pnfs_layout_segment * 1909 pnfs_update_layout(struct inode *ino, 1910 struct nfs_open_context *ctx, 1911 loff_t pos, 1912 u64 count, 1913 enum pnfs_iomode iomode, 1914 bool strict_iomode, 1915 gfp_t gfp_flags) 1916 { 1917 struct pnfs_layout_range arg = { 1918 .iomode = iomode, 1919 .offset = pos, 1920 .length = count, 1921 }; 1922 unsigned pg_offset; 1923 struct nfs_server *server = NFS_SERVER(ino); 1924 struct nfs_client *clp = server->nfs_client; 1925 struct pnfs_layout_hdr *lo = NULL; 1926 struct pnfs_layout_segment *lseg = NULL; 1927 struct nfs4_layoutget *lgp; 1928 nfs4_stateid stateid; 1929 long timeout = 0; 1930 unsigned long giveup = jiffies + (clp->cl_lease_time << 1); 1931 bool first; 1932 1933 if (!pnfs_enabled_sb(NFS_SERVER(ino))) { 1934 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1935 PNFS_UPDATE_LAYOUT_NO_PNFS); 1936 goto out; 1937 } 1938 1939 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) { 1940 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1941 PNFS_UPDATE_LAYOUT_MDSTHRESH); 1942 goto out; 1943 } 1944 1945 lookup_again: 1946 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp)); 1947 if (IS_ERR(lseg)) 1948 goto out; 1949 first = false; 1950 spin_lock(&ino->i_lock); 1951 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); 1952 if (lo == NULL) { 1953 spin_unlock(&ino->i_lock); 1954 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1955 PNFS_UPDATE_LAYOUT_NOMEM); 1956 goto out; 1957 } 1958 1959 /* Do we even need to bother with this? */ 1960 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1961 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1962 PNFS_UPDATE_LAYOUT_BULK_RECALL); 1963 dprintk("%s matches recall, use MDS\n", __func__); 1964 goto out_unlock; 1965 } 1966 1967 /* if LAYOUTGET already failed once we don't try again */ 1968 if (pnfs_layout_io_test_failed(lo, iomode)) { 1969 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1970 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); 1971 goto out_unlock; 1972 } 1973 1974 /* 1975 * If the layout segment list is empty, but there are outstanding 1976 * layoutget calls, then they might be subject to a layoutrecall. 1977 */ 1978 if (list_empty(&lo->plh_segs) && 1979 atomic_read(&lo->plh_outstanding) != 0) { 1980 spin_unlock(&ino->i_lock); 1981 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding, 1982 !atomic_read(&lo->plh_outstanding))); 1983 if (IS_ERR(lseg)) 1984 goto out_put_layout_hdr; 1985 pnfs_put_layout_hdr(lo); 1986 goto lookup_again; 1987 } 1988 1989 lseg = pnfs_find_lseg(lo, &arg, strict_iomode); 1990 if (lseg) { 1991 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1992 PNFS_UPDATE_LAYOUT_FOUND_CACHED); 1993 goto out_unlock; 1994 } 1995 1996 /* 1997 * Choose a stateid for the LAYOUTGET. If we don't have a layout 1998 * stateid, or it has been invalidated, then we must use the open 1999 * stateid. 2000 */ 2001 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { 2002 int status; 2003 2004 /* 2005 * The first layoutget for the file. Need to serialize per 2006 * RFC 5661 Errata 3208. 2007 */ 2008 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, 2009 &lo->plh_flags)) { 2010 spin_unlock(&ino->i_lock); 2011 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, 2012 NFS_LAYOUT_FIRST_LAYOUTGET, 2013 TASK_KILLABLE)); 2014 if (IS_ERR(lseg)) 2015 goto out_put_layout_hdr; 2016 pnfs_put_layout_hdr(lo); 2017 dprintk("%s retrying\n", __func__); 2018 goto lookup_again; 2019 } 2020 2021 spin_unlock(&ino->i_lock); 2022 first = true; 2023 status = nfs4_select_rw_stateid(ctx->state, 2024 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ, 2025 NULL, &stateid, NULL); 2026 if (status != 0) { 2027 lseg = ERR_PTR(status); 2028 trace_pnfs_update_layout(ino, pos, count, 2029 iomode, lo, lseg, 2030 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 2031 nfs4_schedule_stateid_recovery(server, ctx->state); 2032 pnfs_clear_first_layoutget(lo); 2033 pnfs_put_layout_hdr(lo); 2034 goto lookup_again; 2035 } 2036 spin_lock(&ino->i_lock); 2037 } else { 2038 nfs4_stateid_copy(&stateid, &lo->plh_stateid); 2039 } 2040 2041 /* 2042 * Because we free lsegs before sending LAYOUTRETURN, we need to wait 2043 * for LAYOUTRETURN even if first is true. 2044 */ 2045 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 2046 spin_unlock(&ino->i_lock); 2047 dprintk("%s wait for layoutreturn\n", __func__); 2048 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo)); 2049 if (!IS_ERR(lseg)) { 2050 if (first) 2051 pnfs_clear_first_layoutget(lo); 2052 pnfs_put_layout_hdr(lo); 2053 dprintk("%s retrying\n", __func__); 2054 trace_pnfs_update_layout(ino, pos, count, iomode, lo, 2055 lseg, PNFS_UPDATE_LAYOUT_RETRY); 2056 goto lookup_again; 2057 } 2058 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2059 PNFS_UPDATE_LAYOUT_RETURN); 2060 goto out_put_layout_hdr; 2061 } 2062 2063 if (pnfs_layoutgets_blocked(lo)) { 2064 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2065 PNFS_UPDATE_LAYOUT_BLOCKED); 2066 goto out_unlock; 2067 } 2068 nfs_layoutget_begin(lo); 2069 spin_unlock(&ino->i_lock); 2070 2071 _add_to_server_list(lo, server); 2072 2073 pg_offset = arg.offset & ~PAGE_MASK; 2074 if (pg_offset) { 2075 arg.offset -= pg_offset; 2076 arg.length += pg_offset; 2077 } 2078 if (arg.length != NFS4_MAX_UINT64) 2079 arg.length = PAGE_ALIGN(arg.length); 2080 2081 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags); 2082 if (!lgp) { 2083 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL, 2084 PNFS_UPDATE_LAYOUT_NOMEM); 2085 nfs_layoutget_end(lo); 2086 goto out_put_layout_hdr; 2087 } 2088 2089 lseg = nfs4_proc_layoutget(lgp, &timeout); 2090 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2091 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); 2092 nfs_layoutget_end(lo); 2093 if (IS_ERR(lseg)) { 2094 switch(PTR_ERR(lseg)) { 2095 case -EBUSY: 2096 if (time_after(jiffies, giveup)) 2097 lseg = NULL; 2098 break; 2099 case -ERECALLCONFLICT: 2100 case -EAGAIN: 2101 break; 2102 default: 2103 if (!nfs_error_is_fatal(PTR_ERR(lseg))) { 2104 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2105 lseg = NULL; 2106 } 2107 goto out_put_layout_hdr; 2108 } 2109 if (lseg) { 2110 if (first) 2111 pnfs_clear_first_layoutget(lo); 2112 trace_pnfs_update_layout(ino, pos, count, 2113 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); 2114 pnfs_put_layout_hdr(lo); 2115 goto lookup_again; 2116 } 2117 } else { 2118 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2119 } 2120 2121 out_put_layout_hdr: 2122 if (first) 2123 pnfs_clear_first_layoutget(lo); 2124 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2125 PNFS_UPDATE_LAYOUT_EXIT); 2126 pnfs_put_layout_hdr(lo); 2127 out: 2128 dprintk("%s: inode %s/%llu pNFS layout segment %s for " 2129 "(%s, offset: %llu, length: %llu)\n", 2130 __func__, ino->i_sb->s_id, 2131 (unsigned long long)NFS_FILEID(ino), 2132 IS_ERR_OR_NULL(lseg) ? "not found" : "found", 2133 iomode==IOMODE_RW ? "read/write" : "read-only", 2134 (unsigned long long)pos, 2135 (unsigned long long)count); 2136 return lseg; 2137 out_unlock: 2138 spin_unlock(&ino->i_lock); 2139 goto out_put_layout_hdr; 2140 } 2141 EXPORT_SYMBOL_GPL(pnfs_update_layout); 2142 2143 static bool 2144 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) 2145 { 2146 switch (range->iomode) { 2147 case IOMODE_READ: 2148 case IOMODE_RW: 2149 break; 2150 default: 2151 return false; 2152 } 2153 if (range->offset == NFS4_MAX_UINT64) 2154 return false; 2155 if (range->length == 0) 2156 return false; 2157 if (range->length != NFS4_MAX_UINT64 && 2158 range->length > NFS4_MAX_UINT64 - range->offset) 2159 return false; 2160 return true; 2161 } 2162 2163 static struct pnfs_layout_hdr * 2164 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx) 2165 { 2166 struct pnfs_layout_hdr *lo; 2167 2168 spin_lock(&ino->i_lock); 2169 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL); 2170 if (!lo) 2171 goto out_unlock; 2172 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) 2173 goto out_unlock; 2174 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) 2175 goto out_unlock; 2176 if (pnfs_layoutgets_blocked(lo)) 2177 goto out_unlock; 2178 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) 2179 goto out_unlock; 2180 nfs_layoutget_begin(lo); 2181 spin_unlock(&ino->i_lock); 2182 _add_to_server_list(lo, NFS_SERVER(ino)); 2183 return lo; 2184 2185 out_unlock: 2186 spin_unlock(&ino->i_lock); 2187 pnfs_put_layout_hdr(lo); 2188 return NULL; 2189 } 2190 2191 static void _lgopen_prepare_attached(struct nfs4_opendata *data, 2192 struct nfs_open_context *ctx) 2193 { 2194 struct inode *ino = data->dentry->d_inode; 2195 struct pnfs_layout_range rng = { 2196 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2197 IOMODE_RW: IOMODE_READ, 2198 .offset = 0, 2199 .length = NFS4_MAX_UINT64, 2200 }; 2201 struct nfs4_layoutget *lgp; 2202 struct pnfs_layout_hdr *lo; 2203 2204 /* Heuristic: don't send layoutget if we have cached data */ 2205 if (rng.iomode == IOMODE_READ && 2206 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0)) 2207 return; 2208 2209 lo = _pnfs_grab_empty_layout(ino, ctx); 2210 if (!lo) 2211 return; 2212 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, 2213 &rng, GFP_KERNEL); 2214 if (!lgp) { 2215 pnfs_clear_first_layoutget(lo); 2216 pnfs_put_layout_hdr(lo); 2217 return; 2218 } 2219 data->lgp = lgp; 2220 data->o_arg.lg_args = &lgp->args; 2221 data->o_res.lg_res = &lgp->res; 2222 } 2223 2224 static void _lgopen_prepare_floating(struct nfs4_opendata *data, 2225 struct nfs_open_context *ctx) 2226 { 2227 struct pnfs_layout_range rng = { 2228 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2229 IOMODE_RW: IOMODE_READ, 2230 .offset = 0, 2231 .length = NFS4_MAX_UINT64, 2232 }; 2233 struct nfs4_layoutget *lgp; 2234 2235 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid, 2236 &rng, GFP_KERNEL); 2237 if (!lgp) 2238 return; 2239 data->lgp = lgp; 2240 data->o_arg.lg_args = &lgp->args; 2241 data->o_res.lg_res = &lgp->res; 2242 } 2243 2244 void pnfs_lgopen_prepare(struct nfs4_opendata *data, 2245 struct nfs_open_context *ctx) 2246 { 2247 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 2248 2249 if (!(pnfs_enabled_sb(server) && 2250 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN)) 2251 return; 2252 /* Could check on max_ops, but currently hardcoded high enough */ 2253 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN)) 2254 return; 2255 if (data->state) 2256 _lgopen_prepare_attached(data, ctx); 2257 else 2258 _lgopen_prepare_floating(data, ctx); 2259 } 2260 2261 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp, 2262 struct nfs_open_context *ctx) 2263 { 2264 struct pnfs_layout_hdr *lo; 2265 struct pnfs_layout_segment *lseg; 2266 struct nfs_server *srv = NFS_SERVER(ino); 2267 u32 iomode; 2268 2269 if (!lgp) 2270 return; 2271 dprintk("%s: entered with status %i\n", __func__, lgp->res.status); 2272 if (lgp->res.status) { 2273 switch (lgp->res.status) { 2274 default: 2275 break; 2276 /* 2277 * Halt lgopen attempts if the server doesn't recognise 2278 * the "current stateid" value, the layout type, or the 2279 * layoutget operation as being valid. 2280 * Also if it complains about too many ops in the compound 2281 * or of the request/reply being too big. 2282 */ 2283 case -NFS4ERR_BAD_STATEID: 2284 case -NFS4ERR_NOTSUPP: 2285 case -NFS4ERR_REP_TOO_BIG: 2286 case -NFS4ERR_REP_TOO_BIG_TO_CACHE: 2287 case -NFS4ERR_REQ_TOO_BIG: 2288 case -NFS4ERR_TOO_MANY_OPS: 2289 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 2290 srv->caps &= ~NFS_CAP_LGOPEN; 2291 } 2292 return; 2293 } 2294 if (!lgp->args.inode) { 2295 lo = _pnfs_grab_empty_layout(ino, ctx); 2296 if (!lo) 2297 return; 2298 lgp->args.inode = ino; 2299 } else 2300 lo = NFS_I(lgp->args.inode)->layout; 2301 2302 lseg = pnfs_layout_process(lgp); 2303 if (!IS_ERR(lseg)) { 2304 iomode = lgp->args.range.iomode; 2305 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2306 pnfs_put_lseg(lseg); 2307 } 2308 } 2309 2310 void nfs4_lgopen_release(struct nfs4_layoutget *lgp) 2311 { 2312 if (lgp != NULL) { 2313 struct inode *inode = lgp->args.inode; 2314 if (inode) { 2315 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; 2316 pnfs_clear_first_layoutget(lo); 2317 nfs_layoutget_end(lo); 2318 } 2319 pnfs_layoutget_free(lgp); 2320 } 2321 } 2322 2323 struct pnfs_layout_segment * 2324 pnfs_layout_process(struct nfs4_layoutget *lgp) 2325 { 2326 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; 2327 struct nfs4_layoutget_res *res = &lgp->res; 2328 struct pnfs_layout_segment *lseg; 2329 struct inode *ino = lo->plh_inode; 2330 LIST_HEAD(free_me); 2331 2332 if (!pnfs_sanity_check_layout_range(&res->range)) 2333 return ERR_PTR(-EINVAL); 2334 2335 /* Inject layout blob into I/O device driver */ 2336 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); 2337 if (IS_ERR_OR_NULL(lseg)) { 2338 if (!lseg) 2339 lseg = ERR_PTR(-ENOMEM); 2340 2341 dprintk("%s: Could not allocate layout: error %ld\n", 2342 __func__, PTR_ERR(lseg)); 2343 return lseg; 2344 } 2345 2346 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid); 2347 2348 spin_lock(&ino->i_lock); 2349 if (pnfs_layoutgets_blocked(lo)) { 2350 dprintk("%s forget reply due to state\n", __func__); 2351 goto out_forget; 2352 } 2353 2354 if (!pnfs_layout_is_valid(lo)) { 2355 /* We have a completely new layout */ 2356 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true); 2357 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { 2358 /* existing state ID, make sure the sequence number matches. */ 2359 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { 2360 dprintk("%s forget reply due to sequence\n", __func__); 2361 goto out_forget; 2362 } 2363 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false); 2364 } else { 2365 /* 2366 * We got an entirely new state ID. Mark all segments for the 2367 * inode invalid, and retry the layoutget 2368 */ 2369 pnfs_mark_layout_stateid_invalid(lo, &free_me); 2370 goto out_forget; 2371 } 2372 2373 pnfs_get_lseg(lseg); 2374 pnfs_layout_insert_lseg(lo, lseg, &free_me); 2375 2376 2377 if (res->return_on_close) 2378 set_bit(NFS_LSEG_ROC, &lseg->pls_flags); 2379 2380 spin_unlock(&ino->i_lock); 2381 pnfs_free_lseg_list(&free_me); 2382 return lseg; 2383 2384 out_forget: 2385 spin_unlock(&ino->i_lock); 2386 lseg->pls_layout = lo; 2387 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 2388 return ERR_PTR(-EAGAIN); 2389 } 2390 2391 /** 2392 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments 2393 * @lo: pointer to layout header 2394 * @tmp_list: list header to be used with pnfs_free_lseg_list() 2395 * @return_range: describe layout segment ranges to be returned 2396 * @seq: stateid seqid to match 2397 * 2398 * This function is mainly intended for use by layoutrecall. It attempts 2399 * to free the layout segment immediately, or else to mark it for return 2400 * as soon as its reference count drops to zero. 2401 * 2402 * Returns 2403 * - 0: a layoutreturn needs to be scheduled. 2404 * - EBUSY: there are layout segment that are still in use. 2405 * - ENOENT: there are no layout segments that need to be returned. 2406 */ 2407 int 2408 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 2409 struct list_head *tmp_list, 2410 const struct pnfs_layout_range *return_range, 2411 u32 seq) 2412 { 2413 struct pnfs_layout_segment *lseg, *next; 2414 int remaining = 0; 2415 2416 dprintk("%s:Begin lo %p\n", __func__, lo); 2417 2418 assert_spin_locked(&lo->plh_inode->i_lock); 2419 2420 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 2421 if (pnfs_match_lseg_recall(lseg, return_range, seq)) { 2422 dprintk("%s: marking lseg %p iomode %d " 2423 "offset %llu length %llu\n", __func__, 2424 lseg, lseg->pls_range.iomode, 2425 lseg->pls_range.offset, 2426 lseg->pls_range.length); 2427 if (mark_lseg_invalid(lseg, tmp_list)) 2428 continue; 2429 remaining++; 2430 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 2431 } 2432 2433 if (remaining) { 2434 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2435 return -EBUSY; 2436 } 2437 2438 if (!list_empty(&lo->plh_return_segs)) { 2439 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2440 return 0; 2441 } 2442 2443 return -ENOENT; 2444 } 2445 2446 static void 2447 pnfs_mark_layout_for_return(struct inode *inode, 2448 const struct pnfs_layout_range *range) 2449 { 2450 struct pnfs_layout_hdr *lo; 2451 bool return_now = false; 2452 2453 spin_lock(&inode->i_lock); 2454 lo = NFS_I(inode)->layout; 2455 if (!pnfs_layout_is_valid(lo)) { 2456 spin_unlock(&inode->i_lock); 2457 return; 2458 } 2459 pnfs_set_plh_return_info(lo, range->iomode, 0); 2460 /* 2461 * mark all matching lsegs so that we are sure to have no live 2462 * segments at hand when sending layoutreturn. See pnfs_put_lseg() 2463 * for how it works. 2464 */ 2465 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) { 2466 const struct cred *cred; 2467 nfs4_stateid stateid; 2468 enum pnfs_iomode iomode; 2469 2470 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); 2471 spin_unlock(&inode->i_lock); 2472 if (return_now) 2473 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false); 2474 } else { 2475 spin_unlock(&inode->i_lock); 2476 nfs_commit_inode(inode, 0); 2477 } 2478 } 2479 2480 void pnfs_error_mark_layout_for_return(struct inode *inode, 2481 struct pnfs_layout_segment *lseg) 2482 { 2483 struct pnfs_layout_range range = { 2484 .iomode = lseg->pls_range.iomode, 2485 .offset = 0, 2486 .length = NFS4_MAX_UINT64, 2487 }; 2488 2489 pnfs_mark_layout_for_return(inode, &range); 2490 } 2491 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); 2492 2493 static bool 2494 pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo) 2495 { 2496 return pnfs_layout_is_valid(lo) && 2497 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) && 2498 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 2499 } 2500 2501 static struct pnfs_layout_segment * 2502 pnfs_find_first_lseg(struct pnfs_layout_hdr *lo, 2503 const struct pnfs_layout_range *range, 2504 enum pnfs_iomode iomode) 2505 { 2506 struct pnfs_layout_segment *lseg; 2507 2508 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 2509 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) 2510 continue; 2511 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 2512 continue; 2513 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY) 2514 continue; 2515 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range)) 2516 return lseg; 2517 } 2518 return NULL; 2519 } 2520 2521 /* Find open file states whose mode matches that of the range */ 2522 static bool 2523 pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo, 2524 const struct pnfs_layout_range *range) 2525 { 2526 struct list_head *head; 2527 struct nfs_open_context *ctx; 2528 fmode_t mode = 0; 2529 2530 if (!pnfs_layout_can_be_returned(lo) || 2531 !pnfs_find_first_lseg(lo, range, range->iomode)) 2532 return false; 2533 2534 head = &NFS_I(lo->plh_inode)->open_files; 2535 list_for_each_entry_rcu(ctx, head, list) { 2536 if (ctx->state) 2537 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE); 2538 } 2539 2540 switch (range->iomode) { 2541 default: 2542 break; 2543 case IOMODE_READ: 2544 mode &= ~FMODE_WRITE; 2545 break; 2546 case IOMODE_RW: 2547 if (pnfs_find_first_lseg(lo, range, IOMODE_READ)) 2548 mode &= ~FMODE_READ; 2549 } 2550 return mode == 0; 2551 } 2552 2553 static int 2554 pnfs_layout_return_unused_byserver(struct nfs_server *server, void *data) 2555 { 2556 const struct pnfs_layout_range *range = data; 2557 struct pnfs_layout_hdr *lo; 2558 struct inode *inode; 2559 restart: 2560 rcu_read_lock(); 2561 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 2562 if (!pnfs_layout_can_be_returned(lo) || 2563 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 2564 continue; 2565 inode = lo->plh_inode; 2566 spin_lock(&inode->i_lock); 2567 if (!pnfs_should_return_unused_layout(lo, range)) { 2568 spin_unlock(&inode->i_lock); 2569 continue; 2570 } 2571 spin_unlock(&inode->i_lock); 2572 inode = pnfs_grab_inode_layout_hdr(lo); 2573 if (!inode) 2574 continue; 2575 rcu_read_unlock(); 2576 pnfs_mark_layout_for_return(inode, range); 2577 iput(inode); 2578 cond_resched(); 2579 goto restart; 2580 } 2581 rcu_read_unlock(); 2582 return 0; 2583 } 2584 2585 void 2586 pnfs_layout_return_unused_byclid(struct nfs_client *clp, 2587 enum pnfs_iomode iomode) 2588 { 2589 struct pnfs_layout_range range = { 2590 .iomode = iomode, 2591 .offset = 0, 2592 .length = NFS4_MAX_UINT64, 2593 }; 2594 2595 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver, 2596 &range); 2597 } 2598 2599 void 2600 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio) 2601 { 2602 if (pgio->pg_lseg == NULL || 2603 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags)) 2604 return; 2605 pnfs_put_lseg(pgio->pg_lseg); 2606 pgio->pg_lseg = NULL; 2607 } 2608 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); 2609 2610 /* 2611 * Check for any intersection between the request and the pgio->pg_lseg, 2612 * and if none, put this pgio->pg_lseg away. 2613 */ 2614 void 2615 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2616 { 2617 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) { 2618 pnfs_put_lseg(pgio->pg_lseg); 2619 pgio->pg_lseg = NULL; 2620 } 2621 } 2622 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_range); 2623 2624 void 2625 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2626 { 2627 u64 rd_size = req->wb_bytes; 2628 2629 pnfs_generic_pg_check_layout(pgio); 2630 pnfs_generic_pg_check_range(pgio, req); 2631 if (pgio->pg_lseg == NULL) { 2632 if (pgio->pg_dreq == NULL) 2633 rd_size = i_size_read(pgio->pg_inode) - req_offset(req); 2634 else 2635 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq); 2636 2637 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 2638 nfs_req_openctx(req), 2639 req_offset(req), 2640 rd_size, 2641 IOMODE_READ, 2642 false, 2643 GFP_KERNEL); 2644 if (IS_ERR(pgio->pg_lseg)) { 2645 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2646 pgio->pg_lseg = NULL; 2647 return; 2648 } 2649 } 2650 /* If no lseg, fall back to read through mds */ 2651 if (pgio->pg_lseg == NULL) 2652 nfs_pageio_reset_read_mds(pgio); 2653 2654 } 2655 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); 2656 2657 void 2658 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 2659 struct nfs_page *req, u64 wb_size) 2660 { 2661 pnfs_generic_pg_check_layout(pgio); 2662 pnfs_generic_pg_check_range(pgio, req); 2663 if (pgio->pg_lseg == NULL) { 2664 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 2665 nfs_req_openctx(req), 2666 req_offset(req), 2667 wb_size, 2668 IOMODE_RW, 2669 false, 2670 GFP_KERNEL); 2671 if (IS_ERR(pgio->pg_lseg)) { 2672 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2673 pgio->pg_lseg = NULL; 2674 return; 2675 } 2676 } 2677 /* If no lseg, fall back to write through mds */ 2678 if (pgio->pg_lseg == NULL) 2679 nfs_pageio_reset_write_mds(pgio); 2680 } 2681 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); 2682 2683 void 2684 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) 2685 { 2686 if (desc->pg_lseg) { 2687 pnfs_put_lseg(desc->pg_lseg); 2688 desc->pg_lseg = NULL; 2689 } 2690 } 2691 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); 2692 2693 /* 2694 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 2695 * of bytes (maximum @req->wb_bytes) that can be coalesced. 2696 */ 2697 size_t 2698 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 2699 struct nfs_page *prev, struct nfs_page *req) 2700 { 2701 unsigned int size; 2702 u64 seg_end, req_start, seg_left; 2703 2704 size = nfs_generic_pg_test(pgio, prev, req); 2705 if (!size) 2706 return 0; 2707 2708 /* 2709 * 'size' contains the number of bytes left in the current page (up 2710 * to the original size asked for in @req->wb_bytes). 2711 * 2712 * Calculate how many bytes are left in the layout segment 2713 * and if there are less bytes than 'size', return that instead. 2714 * 2715 * Please also note that 'end_offset' is actually the offset of the 2716 * first byte that lies outside the pnfs_layout_range. FIXME? 2717 * 2718 */ 2719 if (pgio->pg_lseg) { 2720 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset, 2721 pgio->pg_lseg->pls_range.length); 2722 req_start = req_offset(req); 2723 2724 /* start of request is past the last byte of this segment */ 2725 if (req_start >= seg_end) 2726 return 0; 2727 2728 /* adjust 'size' iff there are fewer bytes left in the 2729 * segment than what nfs_generic_pg_test returned */ 2730 seg_left = seg_end - req_start; 2731 if (seg_left < size) 2732 size = (unsigned int)seg_left; 2733 } 2734 2735 return size; 2736 } 2737 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); 2738 2739 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) 2740 { 2741 struct nfs_pageio_descriptor pgio; 2742 2743 /* Resend all requests through the MDS */ 2744 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, 2745 hdr->completion_ops); 2746 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags); 2747 return nfs_pageio_resend(&pgio, hdr); 2748 } 2749 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); 2750 2751 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) 2752 { 2753 2754 dprintk("pnfs write error = %d\n", hdr->pnfs_error); 2755 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2756 PNFS_LAYOUTRET_ON_ERROR) { 2757 pnfs_return_layout(hdr->inode); 2758 } 2759 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2760 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); 2761 } 2762 2763 /* 2764 * Called by non rpc-based layout drivers 2765 */ 2766 void pnfs_ld_write_done(struct nfs_pgio_header *hdr) 2767 { 2768 if (likely(!hdr->pnfs_error)) { 2769 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, 2770 hdr->mds_offset + hdr->res.count); 2771 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2772 } 2773 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); 2774 if (unlikely(hdr->pnfs_error)) 2775 pnfs_ld_handle_write_error(hdr); 2776 hdr->mds_ops->rpc_release(hdr); 2777 } 2778 EXPORT_SYMBOL_GPL(pnfs_ld_write_done); 2779 2780 static void 2781 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, 2782 struct nfs_pgio_header *hdr) 2783 { 2784 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2785 2786 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2787 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2788 nfs_pageio_reset_write_mds(desc); 2789 mirror->pg_recoalesce = 1; 2790 } 2791 hdr->completion_ops->completion(hdr); 2792 } 2793 2794 static enum pnfs_try_status 2795 pnfs_try_to_write_data(struct nfs_pgio_header *hdr, 2796 const struct rpc_call_ops *call_ops, 2797 struct pnfs_layout_segment *lseg, 2798 int how) 2799 { 2800 struct inode *inode = hdr->inode; 2801 enum pnfs_try_status trypnfs; 2802 struct nfs_server *nfss = NFS_SERVER(inode); 2803 2804 hdr->mds_ops = call_ops; 2805 2806 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, 2807 inode->i_ino, hdr->args.count, hdr->args.offset, how); 2808 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); 2809 if (trypnfs != PNFS_NOT_ATTEMPTED) 2810 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); 2811 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2812 return trypnfs; 2813 } 2814 2815 static void 2816 pnfs_do_write(struct nfs_pageio_descriptor *desc, 2817 struct nfs_pgio_header *hdr, int how) 2818 { 2819 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2820 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2821 enum pnfs_try_status trypnfs; 2822 2823 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); 2824 switch (trypnfs) { 2825 case PNFS_NOT_ATTEMPTED: 2826 pnfs_write_through_mds(desc, hdr); 2827 case PNFS_ATTEMPTED: 2828 break; 2829 case PNFS_TRY_AGAIN: 2830 /* cleanup hdr and prepare to redo pnfs */ 2831 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2832 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2833 list_splice_init(&hdr->pages, &mirror->pg_list); 2834 mirror->pg_recoalesce = 1; 2835 } 2836 hdr->mds_ops->rpc_release(hdr); 2837 } 2838 } 2839 2840 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) 2841 { 2842 pnfs_put_lseg(hdr->lseg); 2843 nfs_pgio_header_free(hdr); 2844 } 2845 2846 int 2847 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 2848 { 2849 struct nfs_pgio_header *hdr; 2850 int ret; 2851 2852 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2853 if (!hdr) { 2854 desc->pg_error = -ENOMEM; 2855 return desc->pg_error; 2856 } 2857 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); 2858 2859 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 2860 ret = nfs_generic_pgio(desc, hdr); 2861 if (!ret) 2862 pnfs_do_write(desc, hdr, desc->pg_ioflags); 2863 2864 return ret; 2865 } 2866 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); 2867 2868 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) 2869 { 2870 struct nfs_pageio_descriptor pgio; 2871 2872 /* Resend all requests through the MDS */ 2873 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); 2874 return nfs_pageio_resend(&pgio, hdr); 2875 } 2876 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); 2877 2878 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) 2879 { 2880 dprintk("pnfs read error = %d\n", hdr->pnfs_error); 2881 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2882 PNFS_LAYOUTRET_ON_ERROR) { 2883 pnfs_return_layout(hdr->inode); 2884 } 2885 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2886 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); 2887 } 2888 2889 /* 2890 * Called by non rpc-based layout drivers 2891 */ 2892 void pnfs_ld_read_done(struct nfs_pgio_header *hdr) 2893 { 2894 if (likely(!hdr->pnfs_error)) 2895 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2896 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); 2897 if (unlikely(hdr->pnfs_error)) 2898 pnfs_ld_handle_read_error(hdr); 2899 hdr->mds_ops->rpc_release(hdr); 2900 } 2901 EXPORT_SYMBOL_GPL(pnfs_ld_read_done); 2902 2903 static void 2904 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, 2905 struct nfs_pgio_header *hdr) 2906 { 2907 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2908 2909 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2910 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2911 nfs_pageio_reset_read_mds(desc); 2912 mirror->pg_recoalesce = 1; 2913 } 2914 hdr->completion_ops->completion(hdr); 2915 } 2916 2917 /* 2918 * Call the appropriate parallel I/O subsystem read function. 2919 */ 2920 static enum pnfs_try_status 2921 pnfs_try_to_read_data(struct nfs_pgio_header *hdr, 2922 const struct rpc_call_ops *call_ops, 2923 struct pnfs_layout_segment *lseg) 2924 { 2925 struct inode *inode = hdr->inode; 2926 struct nfs_server *nfss = NFS_SERVER(inode); 2927 enum pnfs_try_status trypnfs; 2928 2929 hdr->mds_ops = call_ops; 2930 2931 dprintk("%s: Reading ino:%lu %u@%llu\n", 2932 __func__, inode->i_ino, hdr->args.count, hdr->args.offset); 2933 2934 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); 2935 if (trypnfs != PNFS_NOT_ATTEMPTED) 2936 nfs_inc_stats(inode, NFSIOS_PNFS_READ); 2937 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2938 return trypnfs; 2939 } 2940 2941 /* Resend all requests through pnfs. */ 2942 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr, 2943 unsigned int mirror_idx) 2944 { 2945 struct nfs_pageio_descriptor pgio; 2946 2947 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2948 /* Prevent deadlocks with layoutreturn! */ 2949 pnfs_put_lseg(hdr->lseg); 2950 hdr->lseg = NULL; 2951 2952 nfs_pageio_init_read(&pgio, hdr->inode, false, 2953 hdr->completion_ops); 2954 pgio.pg_mirror_idx = mirror_idx; 2955 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr); 2956 } 2957 } 2958 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); 2959 2960 static void 2961 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) 2962 { 2963 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2964 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2965 enum pnfs_try_status trypnfs; 2966 2967 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); 2968 switch (trypnfs) { 2969 case PNFS_NOT_ATTEMPTED: 2970 pnfs_read_through_mds(desc, hdr); 2971 case PNFS_ATTEMPTED: 2972 break; 2973 case PNFS_TRY_AGAIN: 2974 /* cleanup hdr and prepare to redo pnfs */ 2975 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2976 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2977 list_splice_init(&hdr->pages, &mirror->pg_list); 2978 mirror->pg_recoalesce = 1; 2979 } 2980 hdr->mds_ops->rpc_release(hdr); 2981 } 2982 } 2983 2984 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) 2985 { 2986 pnfs_put_lseg(hdr->lseg); 2987 nfs_pgio_header_free(hdr); 2988 } 2989 2990 int 2991 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) 2992 { 2993 struct nfs_pgio_header *hdr; 2994 int ret; 2995 2996 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2997 if (!hdr) { 2998 desc->pg_error = -ENOMEM; 2999 return desc->pg_error; 3000 } 3001 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); 3002 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 3003 ret = nfs_generic_pgio(desc, hdr); 3004 if (!ret) 3005 pnfs_do_read(desc, hdr); 3006 return ret; 3007 } 3008 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); 3009 3010 static void pnfs_clear_layoutcommitting(struct inode *inode) 3011 { 3012 unsigned long *bitlock = &NFS_I(inode)->flags; 3013 3014 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 3015 smp_mb__after_atomic(); 3016 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 3017 } 3018 3019 /* 3020 * There can be multiple RW segments. 3021 */ 3022 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 3023 { 3024 struct pnfs_layout_segment *lseg; 3025 3026 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { 3027 if (lseg->pls_range.iomode == IOMODE_RW && 3028 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 3029 list_add(&lseg->pls_lc_list, listp); 3030 } 3031 } 3032 3033 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) 3034 { 3035 struct pnfs_layout_segment *lseg, *tmp; 3036 3037 /* Matched by references in pnfs_set_layoutcommit */ 3038 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { 3039 list_del_init(&lseg->pls_lc_list); 3040 pnfs_put_lseg(lseg); 3041 } 3042 3043 pnfs_clear_layoutcommitting(inode); 3044 } 3045 3046 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) 3047 { 3048 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); 3049 } 3050 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); 3051 3052 void 3053 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, 3054 loff_t end_pos) 3055 { 3056 struct nfs_inode *nfsi = NFS_I(inode); 3057 bool mark_as_dirty = false; 3058 3059 spin_lock(&inode->i_lock); 3060 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 3061 nfsi->layout->plh_lwb = end_pos; 3062 mark_as_dirty = true; 3063 dprintk("%s: Set layoutcommit for inode %lu ", 3064 __func__, inode->i_ino); 3065 } else if (end_pos > nfsi->layout->plh_lwb) 3066 nfsi->layout->plh_lwb = end_pos; 3067 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { 3068 /* references matched in nfs4_layoutcommit_release */ 3069 pnfs_get_lseg(lseg); 3070 } 3071 spin_unlock(&inode->i_lock); 3072 dprintk("%s: lseg %p end_pos %llu\n", 3073 __func__, lseg, nfsi->layout->plh_lwb); 3074 3075 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one 3076 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ 3077 if (mark_as_dirty) 3078 mark_inode_dirty_sync(inode); 3079 } 3080 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); 3081 3082 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 3083 { 3084 struct nfs_server *nfss = NFS_SERVER(data->args.inode); 3085 3086 if (nfss->pnfs_curr_ld->cleanup_layoutcommit) 3087 nfss->pnfs_curr_ld->cleanup_layoutcommit(data); 3088 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); 3089 } 3090 3091 /* 3092 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and 3093 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough 3094 * data to disk to allow the server to recover the data if it crashes. 3095 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag 3096 * is off, and a COMMIT is sent to a data server, or 3097 * if WRITEs to a data server return NFS_DATA_SYNC. 3098 */ 3099 int 3100 pnfs_layoutcommit_inode(struct inode *inode, bool sync) 3101 { 3102 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 3103 struct nfs4_layoutcommit_data *data; 3104 struct nfs_inode *nfsi = NFS_I(inode); 3105 loff_t end_pos; 3106 int status; 3107 3108 if (!pnfs_layoutcommit_outstanding(inode)) 3109 return 0; 3110 3111 dprintk("--> %s inode %lu\n", __func__, inode->i_ino); 3112 3113 status = -EAGAIN; 3114 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { 3115 if (!sync) 3116 goto out; 3117 status = wait_on_bit_lock_action(&nfsi->flags, 3118 NFS_INO_LAYOUTCOMMITTING, 3119 nfs_wait_bit_killable, 3120 TASK_KILLABLE); 3121 if (status) 3122 goto out; 3123 } 3124 3125 status = -ENOMEM; 3126 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ 3127 data = kzalloc(sizeof(*data), GFP_NOFS); 3128 if (!data) 3129 goto clear_layoutcommitting; 3130 3131 status = 0; 3132 spin_lock(&inode->i_lock); 3133 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 3134 goto out_unlock; 3135 3136 INIT_LIST_HEAD(&data->lseg_list); 3137 pnfs_list_write_lseg(inode, &data->lseg_list); 3138 3139 end_pos = nfsi->layout->plh_lwb; 3140 3141 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); 3142 data->cred = get_cred(nfsi->layout->plh_lc_cred); 3143 spin_unlock(&inode->i_lock); 3144 3145 data->args.inode = inode; 3146 nfs_fattr_init(&data->fattr); 3147 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3148 data->res.fattr = &data->fattr; 3149 if (end_pos != 0) 3150 data->args.lastbytewritten = end_pos - 1; 3151 else 3152 data->args.lastbytewritten = U64_MAX; 3153 data->res.server = NFS_SERVER(inode); 3154 3155 if (ld->prepare_layoutcommit) { 3156 status = ld->prepare_layoutcommit(&data->args); 3157 if (status) { 3158 put_cred(data->cred); 3159 spin_lock(&inode->i_lock); 3160 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); 3161 if (end_pos > nfsi->layout->plh_lwb) 3162 nfsi->layout->plh_lwb = end_pos; 3163 goto out_unlock; 3164 } 3165 } 3166 3167 3168 status = nfs4_proc_layoutcommit(data, sync); 3169 out: 3170 if (status) 3171 mark_inode_dirty_sync(inode); 3172 dprintk("<-- %s status %d\n", __func__, status); 3173 return status; 3174 out_unlock: 3175 spin_unlock(&inode->i_lock); 3176 kfree(data); 3177 clear_layoutcommitting: 3178 pnfs_clear_layoutcommitting(inode); 3179 goto out; 3180 } 3181 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); 3182 3183 int 3184 pnfs_generic_sync(struct inode *inode, bool datasync) 3185 { 3186 return pnfs_layoutcommit_inode(inode, true); 3187 } 3188 EXPORT_SYMBOL_GPL(pnfs_generic_sync); 3189 3190 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 3191 { 3192 struct nfs4_threshold *thp; 3193 3194 thp = kzalloc(sizeof(*thp), GFP_NOFS); 3195 if (!thp) { 3196 dprintk("%s mdsthreshold allocation failed\n", __func__); 3197 return NULL; 3198 } 3199 return thp; 3200 } 3201 3202 #if IS_ENABLED(CONFIG_NFS_V4_2) 3203 int 3204 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 3205 { 3206 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 3207 struct nfs_server *server = NFS_SERVER(inode); 3208 struct nfs_inode *nfsi = NFS_I(inode); 3209 struct nfs42_layoutstat_data *data; 3210 struct pnfs_layout_hdr *hdr; 3211 int status = 0; 3212 3213 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) 3214 goto out; 3215 3216 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) 3217 goto out; 3218 3219 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) 3220 goto out; 3221 3222 spin_lock(&inode->i_lock); 3223 if (!NFS_I(inode)->layout) { 3224 spin_unlock(&inode->i_lock); 3225 goto out_clear_layoutstats; 3226 } 3227 hdr = NFS_I(inode)->layout; 3228 pnfs_get_layout_hdr(hdr); 3229 spin_unlock(&inode->i_lock); 3230 3231 data = kzalloc(sizeof(*data), gfp_flags); 3232 if (!data) { 3233 status = -ENOMEM; 3234 goto out_put; 3235 } 3236 3237 data->args.fh = NFS_FH(inode); 3238 data->args.inode = inode; 3239 status = ld->prepare_layoutstats(&data->args); 3240 if (status) 3241 goto out_free; 3242 3243 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); 3244 3245 out: 3246 dprintk("%s returns %d\n", __func__, status); 3247 return status; 3248 3249 out_free: 3250 kfree(data); 3251 out_put: 3252 pnfs_put_layout_hdr(hdr); 3253 out_clear_layoutstats: 3254 smp_mb__before_atomic(); 3255 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); 3256 smp_mb__after_atomic(); 3257 goto out; 3258 } 3259 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); 3260 #endif 3261 3262 unsigned int layoutstats_timer; 3263 module_param(layoutstats_timer, uint, 0644); 3264 EXPORT_SYMBOL_GPL(layoutstats_timer); 3265