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 unsigned long i_state; 298 299 if (!lo) 300 return; 301 inode = lo->plh_inode; 302 pnfs_layoutreturn_before_put_layout_hdr(lo); 303 304 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { 305 if (!list_empty(&lo->plh_segs)) 306 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n"); 307 pnfs_detach_layout_hdr(lo); 308 i_state = inode->i_state; 309 spin_unlock(&inode->i_lock); 310 pnfs_free_layout_hdr(lo); 311 /* Notify pnfs_destroy_layout_final() that we're done */ 312 if (i_state & (I_FREEING | I_CLEAR)) 313 wake_up_var(lo); 314 } 315 } 316 317 static struct inode * 318 pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo) 319 { 320 struct inode *inode = igrab(lo->plh_inode); 321 if (inode) 322 return inode; 323 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags); 324 return NULL; 325 } 326 327 static void 328 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode, 329 u32 seq) 330 { 331 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode) 332 iomode = IOMODE_ANY; 333 lo->plh_return_iomode = iomode; 334 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); 335 if (seq != 0) { 336 WARN_ON_ONCE(lo->plh_return_seq != 0 && lo->plh_return_seq != seq); 337 lo->plh_return_seq = seq; 338 } 339 } 340 341 static void 342 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo) 343 { 344 struct pnfs_layout_segment *lseg; 345 lo->plh_return_iomode = 0; 346 lo->plh_return_seq = 0; 347 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); 348 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 349 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 350 continue; 351 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 352 } 353 } 354 355 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) 356 { 357 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); 358 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags); 359 smp_mb__after_atomic(); 360 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); 361 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq); 362 } 363 364 static void 365 pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg, 366 struct list_head *free_me) 367 { 368 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags); 369 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 370 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) 371 pnfs_lseg_dec_and_remove_zero(lseg, free_me); 372 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 373 pnfs_lseg_dec_and_remove_zero(lseg, free_me); 374 } 375 376 /* 377 * Update the seqid of a layout stateid after receiving 378 * NFS4ERR_OLD_STATEID 379 */ 380 bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst, 381 struct pnfs_layout_range *dst_range, 382 struct inode *inode) 383 { 384 struct pnfs_layout_hdr *lo; 385 struct pnfs_layout_range range = { 386 .iomode = IOMODE_ANY, 387 .offset = 0, 388 .length = NFS4_MAX_UINT64, 389 }; 390 bool ret = false; 391 LIST_HEAD(head); 392 int err; 393 394 spin_lock(&inode->i_lock); 395 lo = NFS_I(inode)->layout; 396 if (lo && pnfs_layout_is_valid(lo) && 397 nfs4_stateid_match_other(dst, &lo->plh_stateid)) { 398 /* Is our call using the most recent seqid? If so, bump it */ 399 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) { 400 nfs4_stateid_seqid_inc(dst); 401 ret = true; 402 goto out; 403 } 404 /* Try to update the seqid to the most recent */ 405 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0); 406 if (err != -EBUSY) { 407 dst->seqid = lo->plh_stateid.seqid; 408 *dst_range = range; 409 ret = true; 410 } 411 } 412 out: 413 spin_unlock(&inode->i_lock); 414 pnfs_free_lseg_list(&head); 415 return ret; 416 } 417 418 /* 419 * Mark a pnfs_layout_hdr and all associated layout segments as invalid 420 * 421 * In order to continue using the pnfs_layout_hdr, a full recovery 422 * is required. 423 * Note that caller must hold inode->i_lock. 424 */ 425 int 426 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, 427 struct list_head *lseg_list) 428 { 429 struct pnfs_layout_range range = { 430 .iomode = IOMODE_ANY, 431 .offset = 0, 432 .length = NFS4_MAX_UINT64, 433 }; 434 struct pnfs_layout_segment *lseg, *next; 435 436 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 437 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 438 pnfs_clear_lseg_state(lseg, lseg_list); 439 pnfs_clear_layoutreturn_info(lo); 440 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0); 441 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) && 442 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 443 pnfs_clear_layoutreturn_waitbit(lo); 444 return !list_empty(&lo->plh_segs); 445 } 446 447 static int 448 pnfs_iomode_to_fail_bit(u32 iomode) 449 { 450 return iomode == IOMODE_RW ? 451 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; 452 } 453 454 static void 455 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 456 { 457 lo->plh_retry_timestamp = jiffies; 458 if (!test_and_set_bit(fail_bit, &lo->plh_flags)) 459 refcount_inc(&lo->plh_refcount); 460 } 461 462 static void 463 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 464 { 465 if (test_and_clear_bit(fail_bit, &lo->plh_flags)) 466 refcount_dec(&lo->plh_refcount); 467 } 468 469 static void 470 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) 471 { 472 struct inode *inode = lo->plh_inode; 473 struct pnfs_layout_range range = { 474 .iomode = iomode, 475 .offset = 0, 476 .length = NFS4_MAX_UINT64, 477 }; 478 LIST_HEAD(head); 479 480 spin_lock(&inode->i_lock); 481 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 482 pnfs_mark_matching_lsegs_invalid(lo, &head, &range, 0); 483 spin_unlock(&inode->i_lock); 484 pnfs_free_lseg_list(&head); 485 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, 486 iomode == IOMODE_RW ? "RW" : "READ"); 487 } 488 489 static bool 490 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) 491 { 492 unsigned long start, end; 493 int fail_bit = pnfs_iomode_to_fail_bit(iomode); 494 495 if (test_bit(fail_bit, &lo->plh_flags) == 0) 496 return false; 497 end = jiffies; 498 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; 499 if (!time_in_range(lo->plh_retry_timestamp, start, end)) { 500 /* It is time to retry the failed layoutgets */ 501 pnfs_layout_clear_fail_bit(lo, fail_bit); 502 return false; 503 } 504 return true; 505 } 506 507 static void 508 pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg, 509 const struct pnfs_layout_range *range, 510 const nfs4_stateid *stateid) 511 { 512 INIT_LIST_HEAD(&lseg->pls_list); 513 INIT_LIST_HEAD(&lseg->pls_lc_list); 514 INIT_LIST_HEAD(&lseg->pls_commits); 515 refcount_set(&lseg->pls_refcount, 1); 516 set_bit(NFS_LSEG_VALID, &lseg->pls_flags); 517 lseg->pls_layout = lo; 518 lseg->pls_range = *range; 519 lseg->pls_seq = be32_to_cpu(stateid->seqid); 520 } 521 522 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) 523 { 524 if (lseg != NULL) { 525 struct inode *inode = lseg->pls_layout->plh_inode; 526 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg); 527 } 528 } 529 530 static void 531 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, 532 struct pnfs_layout_segment *lseg) 533 { 534 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 535 list_del_init(&lseg->pls_list); 536 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ 537 refcount_dec(&lo->plh_refcount); 538 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 539 return; 540 if (list_empty(&lo->plh_segs) && 541 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && 542 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 543 if (atomic_read(&lo->plh_outstanding) == 0) 544 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 545 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 546 } 547 } 548 549 static bool 550 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo, 551 struct pnfs_layout_segment *lseg) 552 { 553 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) && 554 pnfs_layout_is_valid(lo)) { 555 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 556 list_move_tail(&lseg->pls_list, &lo->plh_return_segs); 557 return true; 558 } 559 return false; 560 } 561 562 void 563 pnfs_put_lseg(struct pnfs_layout_segment *lseg) 564 { 565 struct pnfs_layout_hdr *lo; 566 struct inode *inode; 567 568 if (!lseg) 569 return; 570 571 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, 572 refcount_read(&lseg->pls_refcount), 573 test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 574 575 lo = lseg->pls_layout; 576 inode = lo->plh_inode; 577 578 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { 579 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 580 spin_unlock(&inode->i_lock); 581 return; 582 } 583 pnfs_get_layout_hdr(lo); 584 pnfs_layout_remove_lseg(lo, lseg); 585 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg)) 586 lseg = NULL; 587 spin_unlock(&inode->i_lock); 588 pnfs_free_lseg(lseg); 589 pnfs_put_layout_hdr(lo); 590 } 591 } 592 EXPORT_SYMBOL_GPL(pnfs_put_lseg); 593 594 /* 595 * is l2 fully contained in l1? 596 * start1 end1 597 * [----------------------------------) 598 * start2 end2 599 * [----------------) 600 */ 601 static bool 602 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, 603 const struct pnfs_layout_range *l2) 604 { 605 u64 start1 = l1->offset; 606 u64 end1 = pnfs_end_offset(start1, l1->length); 607 u64 start2 = l2->offset; 608 u64 end2 = pnfs_end_offset(start2, l2->length); 609 610 return (start1 <= start2) && (end1 >= end2); 611 } 612 613 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, 614 struct list_head *tmp_list) 615 { 616 if (!refcount_dec_and_test(&lseg->pls_refcount)) 617 return false; 618 pnfs_layout_remove_lseg(lseg->pls_layout, lseg); 619 list_add(&lseg->pls_list, tmp_list); 620 return true; 621 } 622 623 /* Returns 1 if lseg is removed from list, 0 otherwise */ 624 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, 625 struct list_head *tmp_list) 626 { 627 int rv = 0; 628 629 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 630 /* Remove the reference keeping the lseg in the 631 * list. It will now be removed when all 632 * outstanding io is finished. 633 */ 634 dprintk("%s: lseg %p ref %d\n", __func__, lseg, 635 refcount_read(&lseg->pls_refcount)); 636 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) 637 rv = 1; 638 } 639 return rv; 640 } 641 642 /* 643 * Compare 2 layout stateid sequence ids, to see which is newer, 644 * taking into account wraparound issues. 645 */ 646 static bool pnfs_seqid_is_newer(u32 s1, u32 s2) 647 { 648 return (s32)(s1 - s2) > 0; 649 } 650 651 static bool 652 pnfs_should_free_range(const struct pnfs_layout_range *lseg_range, 653 const struct pnfs_layout_range *recall_range) 654 { 655 return (recall_range->iomode == IOMODE_ANY || 656 lseg_range->iomode == recall_range->iomode) && 657 pnfs_lseg_range_intersecting(lseg_range, recall_range); 658 } 659 660 static bool 661 pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg, 662 const struct pnfs_layout_range *recall_range, 663 u32 seq) 664 { 665 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq)) 666 return false; 667 if (recall_range == NULL) 668 return true; 669 return pnfs_should_free_range(&lseg->pls_range, recall_range); 670 } 671 672 /** 673 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later 674 * @lo: layout header containing the lsegs 675 * @tmp_list: list head where doomed lsegs should go 676 * @recall_range: optional recall range argument to match (may be NULL) 677 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0) 678 * 679 * Walk the list of lsegs in the layout header, and tear down any that should 680 * be destroyed. If "recall_range" is specified then the segment must match 681 * that range. If "seq" is non-zero, then only match segments that were handed 682 * out at or before that sequence. 683 * 684 * Returns number of matching invalid lsegs remaining in list after scanning 685 * it and purging them. 686 */ 687 int 688 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 689 struct list_head *tmp_list, 690 const struct pnfs_layout_range *recall_range, 691 u32 seq) 692 { 693 struct pnfs_layout_segment *lseg, *next; 694 int remaining = 0; 695 696 dprintk("%s:Begin lo %p\n", __func__, lo); 697 698 if (list_empty(&lo->plh_segs)) 699 return 0; 700 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 701 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) { 702 dprintk("%s: freeing lseg %p iomode %d seq %u " 703 "offset %llu length %llu\n", __func__, 704 lseg, lseg->pls_range.iomode, lseg->pls_seq, 705 lseg->pls_range.offset, lseg->pls_range.length); 706 if (!mark_lseg_invalid(lseg, tmp_list)) 707 remaining++; 708 } 709 dprintk("%s:Return %i\n", __func__, remaining); 710 return remaining; 711 } 712 713 static void 714 pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, 715 struct list_head *free_me, 716 const struct pnfs_layout_range *range, 717 u32 seq) 718 { 719 struct pnfs_layout_segment *lseg, *next; 720 721 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) { 722 if (pnfs_match_lseg_recall(lseg, range, seq)) 723 list_move_tail(&lseg->pls_list, free_me); 724 } 725 } 726 727 /* note free_me must contain lsegs from a single layout_hdr */ 728 void 729 pnfs_free_lseg_list(struct list_head *free_me) 730 { 731 struct pnfs_layout_segment *lseg, *tmp; 732 733 if (list_empty(free_me)) 734 return; 735 736 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { 737 list_del(&lseg->pls_list); 738 pnfs_free_lseg(lseg); 739 } 740 } 741 742 static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi) 743 { 744 struct pnfs_layout_hdr *lo; 745 LIST_HEAD(tmp_list); 746 747 spin_lock(&nfsi->vfs_inode.i_lock); 748 lo = nfsi->layout; 749 if (lo) { 750 pnfs_get_layout_hdr(lo); 751 pnfs_mark_layout_stateid_invalid(lo, &tmp_list); 752 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); 753 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); 754 spin_unlock(&nfsi->vfs_inode.i_lock); 755 pnfs_free_lseg_list(&tmp_list); 756 nfs_commit_inode(&nfsi->vfs_inode, 0); 757 pnfs_put_layout_hdr(lo); 758 } else 759 spin_unlock(&nfsi->vfs_inode.i_lock); 760 return lo; 761 } 762 763 void pnfs_destroy_layout(struct nfs_inode *nfsi) 764 { 765 __pnfs_destroy_layout(nfsi); 766 } 767 EXPORT_SYMBOL_GPL(pnfs_destroy_layout); 768 769 static bool pnfs_layout_removed(struct nfs_inode *nfsi, 770 struct pnfs_layout_hdr *lo) 771 { 772 bool ret; 773 774 spin_lock(&nfsi->vfs_inode.i_lock); 775 ret = nfsi->layout != lo; 776 spin_unlock(&nfsi->vfs_inode.i_lock); 777 return ret; 778 } 779 780 void pnfs_destroy_layout_final(struct nfs_inode *nfsi) 781 { 782 struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi); 783 784 if (lo) 785 wait_var_event(lo, pnfs_layout_removed(nfsi, lo)); 786 } 787 788 static bool 789 pnfs_layout_add_bulk_destroy_list(struct inode *inode, 790 struct list_head *layout_list) 791 { 792 struct pnfs_layout_hdr *lo; 793 bool ret = false; 794 795 spin_lock(&inode->i_lock); 796 lo = NFS_I(inode)->layout; 797 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) { 798 pnfs_get_layout_hdr(lo); 799 list_add(&lo->plh_bulk_destroy, layout_list); 800 ret = true; 801 } 802 spin_unlock(&inode->i_lock); 803 return ret; 804 } 805 806 /* Caller must hold rcu_read_lock and clp->cl_lock */ 807 static int 808 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp, 809 struct nfs_server *server, 810 struct list_head *layout_list) 811 __must_hold(&clp->cl_lock) 812 __must_hold(RCU) 813 { 814 struct pnfs_layout_hdr *lo, *next; 815 struct inode *inode; 816 817 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) { 818 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 819 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) || 820 !list_empty(&lo->plh_bulk_destroy)) 821 continue; 822 /* If the sb is being destroyed, just bail */ 823 if (!nfs_sb_active(server->super)) 824 break; 825 inode = pnfs_grab_inode_layout_hdr(lo); 826 if (inode != NULL) { 827 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) 828 list_del_rcu(&lo->plh_layouts); 829 if (pnfs_layout_add_bulk_destroy_list(inode, 830 layout_list)) 831 continue; 832 rcu_read_unlock(); 833 spin_unlock(&clp->cl_lock); 834 iput(inode); 835 } else { 836 rcu_read_unlock(); 837 spin_unlock(&clp->cl_lock); 838 } 839 nfs_sb_deactive(server->super); 840 spin_lock(&clp->cl_lock); 841 rcu_read_lock(); 842 return -EAGAIN; 843 } 844 return 0; 845 } 846 847 static int 848 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, 849 bool is_bulk_recall) 850 { 851 struct pnfs_layout_hdr *lo; 852 struct inode *inode; 853 LIST_HEAD(lseg_list); 854 int ret = 0; 855 856 while (!list_empty(layout_list)) { 857 lo = list_entry(layout_list->next, struct pnfs_layout_hdr, 858 plh_bulk_destroy); 859 dprintk("%s freeing layout for inode %lu\n", __func__, 860 lo->plh_inode->i_ino); 861 inode = lo->plh_inode; 862 863 pnfs_layoutcommit_inode(inode, false); 864 865 spin_lock(&inode->i_lock); 866 list_del_init(&lo->plh_bulk_destroy); 867 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) { 868 if (is_bulk_recall) 869 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 870 ret = -EAGAIN; 871 } 872 spin_unlock(&inode->i_lock); 873 pnfs_free_lseg_list(&lseg_list); 874 /* Free all lsegs that are attached to commit buckets */ 875 nfs_commit_inode(inode, 0); 876 pnfs_put_layout_hdr(lo); 877 nfs_iput_and_deactive(inode); 878 } 879 return ret; 880 } 881 882 int 883 pnfs_destroy_layouts_byfsid(struct nfs_client *clp, 884 struct nfs_fsid *fsid, 885 bool is_recall) 886 { 887 struct nfs_server *server; 888 LIST_HEAD(layout_list); 889 890 spin_lock(&clp->cl_lock); 891 rcu_read_lock(); 892 restart: 893 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 894 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0) 895 continue; 896 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 897 server, 898 &layout_list) != 0) 899 goto restart; 900 } 901 rcu_read_unlock(); 902 spin_unlock(&clp->cl_lock); 903 904 if (list_empty(&layout_list)) 905 return 0; 906 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 907 } 908 909 int 910 pnfs_destroy_layouts_byclid(struct nfs_client *clp, 911 bool is_recall) 912 { 913 struct nfs_server *server; 914 LIST_HEAD(layout_list); 915 916 spin_lock(&clp->cl_lock); 917 rcu_read_lock(); 918 restart: 919 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 920 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 921 server, 922 &layout_list) != 0) 923 goto restart; 924 } 925 rcu_read_unlock(); 926 spin_unlock(&clp->cl_lock); 927 928 if (list_empty(&layout_list)) 929 return 0; 930 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 931 } 932 933 /* 934 * Called by the state manager to remove all layouts established under an 935 * expired lease. 936 */ 937 void 938 pnfs_destroy_all_layouts(struct nfs_client *clp) 939 { 940 nfs4_deviceid_mark_client_invalid(clp); 941 nfs4_deviceid_purge_client(clp); 942 943 pnfs_destroy_layouts_byclid(clp, false); 944 } 945 946 static void 947 pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred) 948 { 949 const struct cred *old; 950 951 if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) { 952 old = xchg(&lo->plh_lc_cred, get_cred(cred)); 953 put_cred(old); 954 } 955 } 956 957 /* update lo->plh_stateid with new if is more recent */ 958 void 959 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, 960 const struct cred *cred, bool update_barrier) 961 { 962 u32 oldseq, newseq, new_barrier = 0; 963 964 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 965 newseq = be32_to_cpu(new->seqid); 966 967 if (!pnfs_layout_is_valid(lo)) { 968 pnfs_set_layout_cred(lo, cred); 969 nfs4_stateid_copy(&lo->plh_stateid, new); 970 lo->plh_barrier = newseq; 971 pnfs_clear_layoutreturn_info(lo); 972 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 973 return; 974 } 975 if (pnfs_seqid_is_newer(newseq, oldseq)) { 976 nfs4_stateid_copy(&lo->plh_stateid, new); 977 /* 978 * Because of wraparound, we want to keep the barrier 979 * "close" to the current seqids. 980 */ 981 new_barrier = newseq - atomic_read(&lo->plh_outstanding); 982 } 983 if (update_barrier) 984 new_barrier = be32_to_cpu(new->seqid); 985 else if (new_barrier == 0) 986 return; 987 if (pnfs_seqid_is_newer(new_barrier, lo->plh_barrier)) 988 lo->plh_barrier = new_barrier; 989 } 990 991 static bool 992 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, 993 const nfs4_stateid *stateid) 994 { 995 u32 seqid = be32_to_cpu(stateid->seqid); 996 997 return !pnfs_seqid_is_newer(seqid, lo->plh_barrier); 998 } 999 1000 /* lget is set to 1 if called from inside send_layoutget call chain */ 1001 static bool 1002 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo) 1003 { 1004 return lo->plh_block_lgets || 1005 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 1006 } 1007 1008 static struct nfs_server * 1009 pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx) 1010 { 1011 struct nfs_server *server; 1012 1013 if (inode) { 1014 server = NFS_SERVER(inode); 1015 } else { 1016 struct dentry *parent_dir = dget_parent(ctx->dentry); 1017 server = NFS_SERVER(parent_dir->d_inode); 1018 dput(parent_dir); 1019 } 1020 return server; 1021 } 1022 1023 static void nfs4_free_pages(struct page **pages, size_t size) 1024 { 1025 int i; 1026 1027 if (!pages) 1028 return; 1029 1030 for (i = 0; i < size; i++) { 1031 if (!pages[i]) 1032 break; 1033 __free_page(pages[i]); 1034 } 1035 kfree(pages); 1036 } 1037 1038 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 1039 { 1040 struct page **pages; 1041 int i; 1042 1043 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags); 1044 if (!pages) { 1045 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 1046 return NULL; 1047 } 1048 1049 for (i = 0; i < size; i++) { 1050 pages[i] = alloc_page(gfp_flags); 1051 if (!pages[i]) { 1052 dprintk("%s: failed to allocate page\n", __func__); 1053 nfs4_free_pages(pages, i); 1054 return NULL; 1055 } 1056 } 1057 1058 return pages; 1059 } 1060 1061 static struct nfs4_layoutget * 1062 pnfs_alloc_init_layoutget_args(struct inode *ino, 1063 struct nfs_open_context *ctx, 1064 const nfs4_stateid *stateid, 1065 const struct pnfs_layout_range *range, 1066 gfp_t gfp_flags) 1067 { 1068 struct nfs_server *server = pnfs_find_server(ino, ctx); 1069 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response; 1070 size_t max_pages = max_response_pages(server); 1071 struct nfs4_layoutget *lgp; 1072 1073 dprintk("--> %s\n", __func__); 1074 1075 lgp = kzalloc(sizeof(*lgp), gfp_flags); 1076 if (lgp == NULL) 1077 return NULL; 1078 1079 if (max_reply_sz) { 1080 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT; 1081 if (npages < max_pages) 1082 max_pages = npages; 1083 } 1084 1085 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 1086 if (!lgp->args.layout.pages) { 1087 kfree(lgp); 1088 return NULL; 1089 } 1090 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 1091 lgp->res.layoutp = &lgp->args.layout; 1092 1093 /* Don't confuse uninitialised result and success */ 1094 lgp->res.status = -NFS4ERR_DELAY; 1095 1096 lgp->args.minlength = PAGE_SIZE; 1097 if (lgp->args.minlength > range->length) 1098 lgp->args.minlength = range->length; 1099 if (ino) { 1100 loff_t i_size = i_size_read(ino); 1101 1102 if (range->iomode == IOMODE_READ) { 1103 if (range->offset >= i_size) 1104 lgp->args.minlength = 0; 1105 else if (i_size - range->offset < lgp->args.minlength) 1106 lgp->args.minlength = i_size - range->offset; 1107 } 1108 } 1109 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; 1110 pnfs_copy_range(&lgp->args.range, range); 1111 lgp->args.type = server->pnfs_curr_ld->id; 1112 lgp->args.inode = ino; 1113 lgp->args.ctx = get_nfs_open_context(ctx); 1114 nfs4_stateid_copy(&lgp->args.stateid, stateid); 1115 lgp->gfp_flags = gfp_flags; 1116 lgp->cred = ctx->cred; 1117 return lgp; 1118 } 1119 1120 void pnfs_layoutget_free(struct nfs4_layoutget *lgp) 1121 { 1122 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE; 1123 1124 nfs4_free_pages(lgp->args.layout.pages, max_pages); 1125 if (lgp->args.inode) 1126 pnfs_put_layout_hdr(NFS_I(lgp->args.inode)->layout); 1127 put_nfs_open_context(lgp->args.ctx); 1128 kfree(lgp); 1129 } 1130 1131 static void pnfs_clear_layoutcommit(struct inode *inode, 1132 struct list_head *head) 1133 { 1134 struct nfs_inode *nfsi = NFS_I(inode); 1135 struct pnfs_layout_segment *lseg, *tmp; 1136 1137 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 1138 return; 1139 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { 1140 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 1141 continue; 1142 pnfs_lseg_dec_and_remove_zero(lseg, head); 1143 } 1144 } 1145 1146 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, 1147 const nfs4_stateid *arg_stateid, 1148 const struct pnfs_layout_range *range, 1149 const nfs4_stateid *stateid) 1150 { 1151 struct inode *inode = lo->plh_inode; 1152 LIST_HEAD(freeme); 1153 1154 spin_lock(&inode->i_lock); 1155 if (!pnfs_layout_is_valid(lo) || !arg_stateid || 1156 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) 1157 goto out_unlock; 1158 if (stateid) { 1159 u32 seq = be32_to_cpu(arg_stateid->seqid); 1160 1161 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq); 1162 pnfs_free_returned_lsegs(lo, &freeme, range, seq); 1163 pnfs_set_layout_stateid(lo, stateid, NULL, true); 1164 } else 1165 pnfs_mark_layout_stateid_invalid(lo, &freeme); 1166 out_unlock: 1167 pnfs_clear_layoutreturn_waitbit(lo); 1168 spin_unlock(&inode->i_lock); 1169 pnfs_free_lseg_list(&freeme); 1170 1171 } 1172 1173 static bool 1174 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo, 1175 nfs4_stateid *stateid, 1176 const struct cred **cred, 1177 enum pnfs_iomode *iomode) 1178 { 1179 /* Serialise LAYOUTGET/LAYOUTRETURN */ 1180 if (atomic_read(&lo->plh_outstanding) != 0) 1181 return false; 1182 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 1183 return false; 1184 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 1185 pnfs_get_layout_hdr(lo); 1186 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) { 1187 nfs4_stateid_copy(stateid, &lo->plh_stateid); 1188 *cred = get_cred(lo->plh_lc_cred); 1189 if (lo->plh_return_seq != 0) 1190 stateid->seqid = cpu_to_be32(lo->plh_return_seq); 1191 if (iomode != NULL) 1192 *iomode = lo->plh_return_iomode; 1193 pnfs_clear_layoutreturn_info(lo); 1194 return true; 1195 } 1196 nfs4_stateid_copy(stateid, &lo->plh_stateid); 1197 *cred = get_cred(lo->plh_lc_cred); 1198 if (iomode != NULL) 1199 *iomode = IOMODE_ANY; 1200 return true; 1201 } 1202 1203 static void 1204 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args, 1205 struct pnfs_layout_hdr *lo, 1206 const nfs4_stateid *stateid, 1207 enum pnfs_iomode iomode) 1208 { 1209 struct inode *inode = lo->plh_inode; 1210 1211 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id; 1212 args->inode = inode; 1213 args->range.iomode = iomode; 1214 args->range.offset = 0; 1215 args->range.length = NFS4_MAX_UINT64; 1216 args->layout = lo; 1217 nfs4_stateid_copy(&args->stateid, stateid); 1218 } 1219 1220 static int 1221 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, 1222 const nfs4_stateid *stateid, 1223 const struct cred **pcred, 1224 enum pnfs_iomode iomode, 1225 bool sync) 1226 { 1227 struct inode *ino = lo->plh_inode; 1228 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1229 struct nfs4_layoutreturn *lrp; 1230 const struct cred *cred = *pcred; 1231 int status = 0; 1232 1233 *pcred = NULL; 1234 lrp = kzalloc(sizeof(*lrp), GFP_NOFS); 1235 if (unlikely(lrp == NULL)) { 1236 status = -ENOMEM; 1237 spin_lock(&ino->i_lock); 1238 pnfs_clear_layoutreturn_waitbit(lo); 1239 spin_unlock(&ino->i_lock); 1240 put_cred(cred); 1241 pnfs_put_layout_hdr(lo); 1242 goto out; 1243 } 1244 1245 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode); 1246 lrp->args.ld_private = &lrp->ld_private; 1247 lrp->clp = NFS_SERVER(ino)->nfs_client; 1248 lrp->cred = cred; 1249 if (ld->prepare_layoutreturn) 1250 ld->prepare_layoutreturn(&lrp->args); 1251 1252 status = nfs4_proc_layoutreturn(lrp, sync); 1253 out: 1254 dprintk("<-- %s status: %d\n", __func__, status); 1255 return status; 1256 } 1257 1258 static bool 1259 pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo, 1260 enum pnfs_iomode iomode, 1261 u32 seq) 1262 { 1263 struct pnfs_layout_range recall_range = { 1264 .length = NFS4_MAX_UINT64, 1265 .iomode = iomode, 1266 }; 1267 return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, 1268 &recall_range, seq) != -EBUSY; 1269 } 1270 1271 /* Return true if layoutreturn is needed */ 1272 static bool 1273 pnfs_layout_need_return(struct pnfs_layout_hdr *lo) 1274 { 1275 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1276 return false; 1277 return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode, 1278 lo->plh_return_seq); 1279 } 1280 1281 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo) 1282 { 1283 struct inode *inode= lo->plh_inode; 1284 1285 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1286 return; 1287 spin_lock(&inode->i_lock); 1288 if (pnfs_layout_need_return(lo)) { 1289 const struct cred *cred; 1290 nfs4_stateid stateid; 1291 enum pnfs_iomode iomode; 1292 bool send; 1293 1294 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); 1295 spin_unlock(&inode->i_lock); 1296 if (send) { 1297 /* Send an async layoutreturn so we dont deadlock */ 1298 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false); 1299 } 1300 } else 1301 spin_unlock(&inode->i_lock); 1302 } 1303 1304 /* 1305 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr 1306 * when the layout segment list is empty. 1307 * 1308 * Note that a pnfs_layout_hdr can exist with an empty layout segment 1309 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the 1310 * deviceid is marked invalid. 1311 */ 1312 int 1313 _pnfs_return_layout(struct inode *ino) 1314 { 1315 struct pnfs_layout_hdr *lo = NULL; 1316 struct nfs_inode *nfsi = NFS_I(ino); 1317 LIST_HEAD(tmp_list); 1318 const struct cred *cred; 1319 nfs4_stateid stateid; 1320 int status = 0; 1321 bool send, valid_layout; 1322 1323 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); 1324 1325 spin_lock(&ino->i_lock); 1326 lo = nfsi->layout; 1327 if (!lo) { 1328 spin_unlock(&ino->i_lock); 1329 dprintk("NFS: %s no layout to return\n", __func__); 1330 goto out; 1331 } 1332 /* Reference matched in nfs4_layoutreturn_release */ 1333 pnfs_get_layout_hdr(lo); 1334 /* Is there an outstanding layoutreturn ? */ 1335 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1336 spin_unlock(&ino->i_lock); 1337 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1338 TASK_UNINTERRUPTIBLE)) 1339 goto out_put_layout_hdr; 1340 spin_lock(&ino->i_lock); 1341 } 1342 valid_layout = pnfs_layout_is_valid(lo); 1343 pnfs_clear_layoutcommit(ino, &tmp_list); 1344 pnfs_mark_matching_lsegs_invalid(lo, &tmp_list, NULL, 0); 1345 1346 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) { 1347 struct pnfs_layout_range range = { 1348 .iomode = IOMODE_ANY, 1349 .offset = 0, 1350 .length = NFS4_MAX_UINT64, 1351 }; 1352 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); 1353 } 1354 1355 /* Don't send a LAYOUTRETURN if list was initially empty */ 1356 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) || 1357 !valid_layout) { 1358 spin_unlock(&ino->i_lock); 1359 dprintk("NFS: %s no layout segments to return\n", __func__); 1360 goto out_wait_layoutreturn; 1361 } 1362 1363 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL); 1364 spin_unlock(&ino->i_lock); 1365 if (send) 1366 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true); 1367 out_wait_layoutreturn: 1368 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE); 1369 out_put_layout_hdr: 1370 pnfs_free_lseg_list(&tmp_list); 1371 pnfs_put_layout_hdr(lo); 1372 out: 1373 dprintk("<-- %s status: %d\n", __func__, status); 1374 return status; 1375 } 1376 1377 int 1378 pnfs_commit_and_return_layout(struct inode *inode) 1379 { 1380 struct pnfs_layout_hdr *lo; 1381 int ret; 1382 1383 spin_lock(&inode->i_lock); 1384 lo = NFS_I(inode)->layout; 1385 if (lo == NULL) { 1386 spin_unlock(&inode->i_lock); 1387 return 0; 1388 } 1389 pnfs_get_layout_hdr(lo); 1390 /* Block new layoutgets and read/write to ds */ 1391 lo->plh_block_lgets++; 1392 spin_unlock(&inode->i_lock); 1393 filemap_fdatawait(inode->i_mapping); 1394 ret = pnfs_layoutcommit_inode(inode, true); 1395 if (ret == 0) 1396 ret = _pnfs_return_layout(inode); 1397 spin_lock(&inode->i_lock); 1398 lo->plh_block_lgets--; 1399 spin_unlock(&inode->i_lock); 1400 pnfs_put_layout_hdr(lo); 1401 return ret; 1402 } 1403 1404 bool pnfs_roc(struct inode *ino, 1405 struct nfs4_layoutreturn_args *args, 1406 struct nfs4_layoutreturn_res *res, 1407 const struct cred *cred) 1408 { 1409 struct nfs_inode *nfsi = NFS_I(ino); 1410 struct nfs_open_context *ctx; 1411 struct nfs4_state *state; 1412 struct pnfs_layout_hdr *lo; 1413 struct pnfs_layout_segment *lseg, *next; 1414 const struct cred *lc_cred; 1415 nfs4_stateid stateid; 1416 enum pnfs_iomode iomode = 0; 1417 bool layoutreturn = false, roc = false; 1418 bool skip_read = false; 1419 1420 if (!nfs_have_layout(ino)) 1421 return false; 1422 retry: 1423 rcu_read_lock(); 1424 spin_lock(&ino->i_lock); 1425 lo = nfsi->layout; 1426 if (!lo || !pnfs_layout_is_valid(lo) || 1427 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1428 lo = NULL; 1429 goto out_noroc; 1430 } 1431 pnfs_get_layout_hdr(lo); 1432 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1433 spin_unlock(&ino->i_lock); 1434 rcu_read_unlock(); 1435 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1436 TASK_UNINTERRUPTIBLE); 1437 pnfs_put_layout_hdr(lo); 1438 goto retry; 1439 } 1440 1441 /* no roc if we hold a delegation */ 1442 if (nfs4_check_delegation(ino, FMODE_READ)) { 1443 if (nfs4_check_delegation(ino, FMODE_WRITE)) 1444 goto out_noroc; 1445 skip_read = true; 1446 } 1447 1448 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 1449 state = ctx->state; 1450 if (state == NULL) 1451 continue; 1452 /* Don't return layout if there is open file state */ 1453 if (state->state & FMODE_WRITE) 1454 goto out_noroc; 1455 if (state->state & FMODE_READ) 1456 skip_read = true; 1457 } 1458 1459 1460 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) { 1461 if (skip_read && lseg->pls_range.iomode == IOMODE_READ) 1462 continue; 1463 /* If we are sending layoutreturn, invalidate all valid lsegs */ 1464 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags)) 1465 continue; 1466 /* 1467 * Note: mark lseg for return so pnfs_layout_remove_lseg 1468 * doesn't invalidate the layout for us. 1469 */ 1470 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 1471 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs)) 1472 continue; 1473 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 1474 } 1475 1476 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1477 goto out_noroc; 1478 1479 /* ROC in two conditions: 1480 * 1. there are ROC lsegs 1481 * 2. we don't send layoutreturn 1482 */ 1483 /* lo ref dropped in pnfs_roc_release() */ 1484 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode); 1485 /* If the creds don't match, we can't compound the layoutreturn */ 1486 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0) 1487 goto out_noroc; 1488 1489 roc = layoutreturn; 1490 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode); 1491 res->lrs_present = 0; 1492 layoutreturn = false; 1493 put_cred(lc_cred); 1494 1495 out_noroc: 1496 spin_unlock(&ino->i_lock); 1497 rcu_read_unlock(); 1498 pnfs_layoutcommit_inode(ino, true); 1499 if (roc) { 1500 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1501 if (ld->prepare_layoutreturn) 1502 ld->prepare_layoutreturn(args); 1503 pnfs_put_layout_hdr(lo); 1504 return true; 1505 } 1506 if (layoutreturn) 1507 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, true); 1508 pnfs_put_layout_hdr(lo); 1509 return false; 1510 } 1511 1512 int pnfs_roc_done(struct rpc_task *task, struct inode *inode, 1513 struct nfs4_layoutreturn_args **argpp, 1514 struct nfs4_layoutreturn_res **respp, 1515 int *ret) 1516 { 1517 struct nfs4_layoutreturn_args *arg = *argpp; 1518 int retval = -EAGAIN; 1519 1520 if (!arg) 1521 return 0; 1522 /* Handle Layoutreturn errors */ 1523 switch (*ret) { 1524 case 0: 1525 retval = 0; 1526 break; 1527 case -NFS4ERR_NOMATCHING_LAYOUT: 1528 /* Was there an RPC level error? If not, retry */ 1529 if (task->tk_rpc_status == 0) 1530 break; 1531 /* If the call was not sent, let caller handle it */ 1532 if (!RPC_WAS_SENT(task)) 1533 return 0; 1534 /* 1535 * Otherwise, assume the call succeeded and 1536 * that we need to release the layout 1537 */ 1538 *ret = 0; 1539 (*respp)->lrs_present = 0; 1540 retval = 0; 1541 break; 1542 case -NFS4ERR_DELAY: 1543 /* Let the caller handle the retry */ 1544 *ret = -NFS4ERR_NOMATCHING_LAYOUT; 1545 return 0; 1546 case -NFS4ERR_OLD_STATEID: 1547 if (!nfs4_layout_refresh_old_stateid(&arg->stateid, 1548 &arg->range, inode)) 1549 break; 1550 *ret = -NFS4ERR_NOMATCHING_LAYOUT; 1551 return -EAGAIN; 1552 } 1553 *argpp = NULL; 1554 *respp = NULL; 1555 return retval; 1556 } 1557 1558 void pnfs_roc_release(struct nfs4_layoutreturn_args *args, 1559 struct nfs4_layoutreturn_res *res, 1560 int ret) 1561 { 1562 struct pnfs_layout_hdr *lo = args->layout; 1563 const nfs4_stateid *arg_stateid = NULL; 1564 const nfs4_stateid *res_stateid = NULL; 1565 struct nfs4_xdr_opaque_data *ld_private = args->ld_private; 1566 1567 switch (ret) { 1568 case -NFS4ERR_NOMATCHING_LAYOUT: 1569 break; 1570 case 0: 1571 if (res->lrs_present) 1572 res_stateid = &res->stateid; 1573 fallthrough; 1574 default: 1575 arg_stateid = &args->stateid; 1576 } 1577 trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret); 1578 pnfs_layoutreturn_free_lsegs(lo, arg_stateid, &args->range, 1579 res_stateid); 1580 if (ld_private && ld_private->ops && ld_private->ops->free) 1581 ld_private->ops->free(ld_private); 1582 pnfs_put_layout_hdr(lo); 1583 } 1584 1585 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) 1586 { 1587 struct nfs_inode *nfsi = NFS_I(ino); 1588 struct pnfs_layout_hdr *lo; 1589 bool sleep = false; 1590 1591 /* we might not have grabbed lo reference. so need to check under 1592 * i_lock */ 1593 spin_lock(&ino->i_lock); 1594 lo = nfsi->layout; 1595 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1596 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1597 sleep = true; 1598 } 1599 spin_unlock(&ino->i_lock); 1600 return sleep; 1601 } 1602 1603 /* 1604 * Compare two layout segments for sorting into layout cache. 1605 * We want to preferentially return RW over RO layouts, so ensure those 1606 * are seen first. 1607 */ 1608 static s64 1609 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, 1610 const struct pnfs_layout_range *l2) 1611 { 1612 s64 d; 1613 1614 /* high offset > low offset */ 1615 d = l1->offset - l2->offset; 1616 if (d) 1617 return d; 1618 1619 /* short length > long length */ 1620 d = l2->length - l1->length; 1621 if (d) 1622 return d; 1623 1624 /* read > read/write */ 1625 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); 1626 } 1627 1628 static bool 1629 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1, 1630 const struct pnfs_layout_range *l2) 1631 { 1632 return pnfs_lseg_range_cmp(l1, l2) > 0; 1633 } 1634 1635 static bool 1636 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg, 1637 struct pnfs_layout_segment *old) 1638 { 1639 return false; 1640 } 1641 1642 void 1643 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1644 struct pnfs_layout_segment *lseg, 1645 bool (*is_after)(const struct pnfs_layout_range *, 1646 const struct pnfs_layout_range *), 1647 bool (*do_merge)(struct pnfs_layout_segment *, 1648 struct pnfs_layout_segment *), 1649 struct list_head *free_me) 1650 { 1651 struct pnfs_layout_segment *lp, *tmp; 1652 1653 dprintk("%s:Begin\n", __func__); 1654 1655 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) { 1656 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0) 1657 continue; 1658 if (do_merge(lseg, lp)) { 1659 mark_lseg_invalid(lp, free_me); 1660 continue; 1661 } 1662 if (is_after(&lseg->pls_range, &lp->pls_range)) 1663 continue; 1664 list_add_tail(&lseg->pls_list, &lp->pls_list); 1665 dprintk("%s: inserted lseg %p " 1666 "iomode %d offset %llu length %llu before " 1667 "lp %p iomode %d offset %llu length %llu\n", 1668 __func__, lseg, lseg->pls_range.iomode, 1669 lseg->pls_range.offset, lseg->pls_range.length, 1670 lp, lp->pls_range.iomode, lp->pls_range.offset, 1671 lp->pls_range.length); 1672 goto out; 1673 } 1674 list_add_tail(&lseg->pls_list, &lo->plh_segs); 1675 dprintk("%s: inserted lseg %p " 1676 "iomode %d offset %llu length %llu at tail\n", 1677 __func__, lseg, lseg->pls_range.iomode, 1678 lseg->pls_range.offset, lseg->pls_range.length); 1679 out: 1680 pnfs_get_layout_hdr(lo); 1681 1682 dprintk("%s:Return\n", __func__); 1683 } 1684 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg); 1685 1686 static void 1687 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1688 struct pnfs_layout_segment *lseg, 1689 struct list_head *free_me) 1690 { 1691 struct inode *inode = lo->plh_inode; 1692 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 1693 1694 if (ld->add_lseg != NULL) 1695 ld->add_lseg(lo, lseg, free_me); 1696 else 1697 pnfs_generic_layout_insert_lseg(lo, lseg, 1698 pnfs_lseg_range_is_after, 1699 pnfs_lseg_no_merge, 1700 free_me); 1701 } 1702 1703 static struct pnfs_layout_hdr * 1704 alloc_init_layout_hdr(struct inode *ino, 1705 struct nfs_open_context *ctx, 1706 gfp_t gfp_flags) 1707 { 1708 struct pnfs_layout_hdr *lo; 1709 1710 lo = pnfs_alloc_layout_hdr(ino, gfp_flags); 1711 if (!lo) 1712 return NULL; 1713 refcount_set(&lo->plh_refcount, 1); 1714 INIT_LIST_HEAD(&lo->plh_layouts); 1715 INIT_LIST_HEAD(&lo->plh_segs); 1716 INIT_LIST_HEAD(&lo->plh_return_segs); 1717 INIT_LIST_HEAD(&lo->plh_bulk_destroy); 1718 lo->plh_inode = ino; 1719 lo->plh_lc_cred = get_cred(ctx->cred); 1720 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID; 1721 return lo; 1722 } 1723 1724 static struct pnfs_layout_hdr * 1725 pnfs_find_alloc_layout(struct inode *ino, 1726 struct nfs_open_context *ctx, 1727 gfp_t gfp_flags) 1728 __releases(&ino->i_lock) 1729 __acquires(&ino->i_lock) 1730 { 1731 struct nfs_inode *nfsi = NFS_I(ino); 1732 struct pnfs_layout_hdr *new = NULL; 1733 1734 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); 1735 1736 if (nfsi->layout != NULL) 1737 goto out_existing; 1738 spin_unlock(&ino->i_lock); 1739 new = alloc_init_layout_hdr(ino, ctx, gfp_flags); 1740 spin_lock(&ino->i_lock); 1741 1742 if (likely(nfsi->layout == NULL)) { /* Won the race? */ 1743 nfsi->layout = new; 1744 return new; 1745 } else if (new != NULL) 1746 pnfs_free_layout_hdr(new); 1747 out_existing: 1748 pnfs_get_layout_hdr(nfsi->layout); 1749 return nfsi->layout; 1750 } 1751 1752 /* 1753 * iomode matching rules: 1754 * iomode lseg strict match 1755 * iomode 1756 * ----- ----- ------ ----- 1757 * ANY READ N/A true 1758 * ANY RW N/A true 1759 * RW READ N/A false 1760 * RW RW N/A true 1761 * READ READ N/A true 1762 * READ RW true false 1763 * READ RW false true 1764 */ 1765 static bool 1766 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, 1767 const struct pnfs_layout_range *range, 1768 bool strict_iomode) 1769 { 1770 struct pnfs_layout_range range1; 1771 1772 if ((range->iomode == IOMODE_RW && 1773 ls_range->iomode != IOMODE_RW) || 1774 (range->iomode != ls_range->iomode && 1775 strict_iomode) || 1776 !pnfs_lseg_range_intersecting(ls_range, range)) 1777 return false; 1778 1779 /* range1 covers only the first byte in the range */ 1780 range1 = *range; 1781 range1.length = 1; 1782 return pnfs_lseg_range_contained(ls_range, &range1); 1783 } 1784 1785 /* 1786 * lookup range in layout 1787 */ 1788 static struct pnfs_layout_segment * 1789 pnfs_find_lseg(struct pnfs_layout_hdr *lo, 1790 struct pnfs_layout_range *range, 1791 bool strict_iomode) 1792 { 1793 struct pnfs_layout_segment *lseg, *ret = NULL; 1794 1795 dprintk("%s:Begin\n", __func__); 1796 1797 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 1798 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && 1799 pnfs_lseg_range_match(&lseg->pls_range, range, 1800 strict_iomode)) { 1801 ret = pnfs_get_lseg(lseg); 1802 break; 1803 } 1804 } 1805 1806 dprintk("%s:Return lseg %p ref %d\n", 1807 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0); 1808 return ret; 1809 } 1810 1811 /* 1812 * Use mdsthreshold hints set at each OPEN to determine if I/O should go 1813 * to the MDS or over pNFS 1814 * 1815 * The nfs_inode read_io and write_io fields are cumulative counters reset 1816 * when there are no layout segments. Note that in pnfs_update_layout iomode 1817 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a 1818 * WRITE request. 1819 * 1820 * A return of true means use MDS I/O. 1821 * 1822 * From rfc 5661: 1823 * If a file's size is smaller than the file size threshold, data accesses 1824 * SHOULD be sent to the metadata server. If an I/O request has a length that 1825 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata 1826 * server. If both file size and I/O size are provided, the client SHOULD 1827 * reach or exceed both thresholds before sending its read or write 1828 * requests to the data server. 1829 */ 1830 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, 1831 struct inode *ino, int iomode) 1832 { 1833 struct nfs4_threshold *t = ctx->mdsthreshold; 1834 struct nfs_inode *nfsi = NFS_I(ino); 1835 loff_t fsize = i_size_read(ino); 1836 bool size = false, size_set = false, io = false, io_set = false, ret = false; 1837 1838 if (t == NULL) 1839 return ret; 1840 1841 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", 1842 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); 1843 1844 switch (iomode) { 1845 case IOMODE_READ: 1846 if (t->bm & THRESHOLD_RD) { 1847 dprintk("%s fsize %llu\n", __func__, fsize); 1848 size_set = true; 1849 if (fsize < t->rd_sz) 1850 size = true; 1851 } 1852 if (t->bm & THRESHOLD_RD_IO) { 1853 dprintk("%s nfsi->read_io %llu\n", __func__, 1854 nfsi->read_io); 1855 io_set = true; 1856 if (nfsi->read_io < t->rd_io_sz) 1857 io = true; 1858 } 1859 break; 1860 case IOMODE_RW: 1861 if (t->bm & THRESHOLD_WR) { 1862 dprintk("%s fsize %llu\n", __func__, fsize); 1863 size_set = true; 1864 if (fsize < t->wr_sz) 1865 size = true; 1866 } 1867 if (t->bm & THRESHOLD_WR_IO) { 1868 dprintk("%s nfsi->write_io %llu\n", __func__, 1869 nfsi->write_io); 1870 io_set = true; 1871 if (nfsi->write_io < t->wr_io_sz) 1872 io = true; 1873 } 1874 break; 1875 } 1876 if (size_set && io_set) { 1877 if (size && io) 1878 ret = true; 1879 } else if (size || io) 1880 ret = true; 1881 1882 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); 1883 return ret; 1884 } 1885 1886 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) 1887 { 1888 /* 1889 * send layoutcommit as it can hold up layoutreturn due to lseg 1890 * reference 1891 */ 1892 pnfs_layoutcommit_inode(lo->plh_inode, false); 1893 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, 1894 nfs_wait_bit_killable, 1895 TASK_KILLABLE); 1896 } 1897 1898 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo) 1899 { 1900 atomic_inc(&lo->plh_outstanding); 1901 } 1902 1903 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo) 1904 { 1905 if (atomic_dec_and_test(&lo->plh_outstanding)) 1906 wake_up_var(&lo->plh_outstanding); 1907 } 1908 1909 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) 1910 { 1911 unsigned long *bitlock = &lo->plh_flags; 1912 1913 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); 1914 smp_mb__after_atomic(); 1915 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); 1916 } 1917 1918 static void _add_to_server_list(struct pnfs_layout_hdr *lo, 1919 struct nfs_server *server) 1920 { 1921 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) { 1922 struct nfs_client *clp = server->nfs_client; 1923 1924 /* The lo must be on the clp list if there is any 1925 * chance of a CB_LAYOUTRECALL(FILE) coming in. 1926 */ 1927 spin_lock(&clp->cl_lock); 1928 list_add_tail_rcu(&lo->plh_layouts, &server->layouts); 1929 spin_unlock(&clp->cl_lock); 1930 } 1931 } 1932 1933 /* 1934 * Layout segment is retreived from the server if not cached. 1935 * The appropriate layout segment is referenced and returned to the caller. 1936 */ 1937 struct pnfs_layout_segment * 1938 pnfs_update_layout(struct inode *ino, 1939 struct nfs_open_context *ctx, 1940 loff_t pos, 1941 u64 count, 1942 enum pnfs_iomode iomode, 1943 bool strict_iomode, 1944 gfp_t gfp_flags) 1945 { 1946 struct pnfs_layout_range arg = { 1947 .iomode = iomode, 1948 .offset = pos, 1949 .length = count, 1950 }; 1951 unsigned pg_offset; 1952 struct nfs_server *server = NFS_SERVER(ino); 1953 struct nfs_client *clp = server->nfs_client; 1954 struct pnfs_layout_hdr *lo = NULL; 1955 struct pnfs_layout_segment *lseg = NULL; 1956 struct nfs4_layoutget *lgp; 1957 nfs4_stateid stateid; 1958 long timeout = 0; 1959 unsigned long giveup = jiffies + (clp->cl_lease_time << 1); 1960 bool first; 1961 1962 if (!pnfs_enabled_sb(NFS_SERVER(ino))) { 1963 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1964 PNFS_UPDATE_LAYOUT_NO_PNFS); 1965 goto out; 1966 } 1967 1968 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) { 1969 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1970 PNFS_UPDATE_LAYOUT_MDSTHRESH); 1971 goto out; 1972 } 1973 1974 lookup_again: 1975 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp)); 1976 if (IS_ERR(lseg)) 1977 goto out; 1978 first = false; 1979 spin_lock(&ino->i_lock); 1980 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); 1981 if (lo == NULL) { 1982 spin_unlock(&ino->i_lock); 1983 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1984 PNFS_UPDATE_LAYOUT_NOMEM); 1985 goto out; 1986 } 1987 1988 /* Do we even need to bother with this? */ 1989 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1990 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1991 PNFS_UPDATE_LAYOUT_BULK_RECALL); 1992 dprintk("%s matches recall, use MDS\n", __func__); 1993 goto out_unlock; 1994 } 1995 1996 /* if LAYOUTGET already failed once we don't try again */ 1997 if (pnfs_layout_io_test_failed(lo, iomode)) { 1998 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1999 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); 2000 goto out_unlock; 2001 } 2002 2003 /* 2004 * If the layout segment list is empty, but there are outstanding 2005 * layoutget calls, then they might be subject to a layoutrecall. 2006 */ 2007 if (list_empty(&lo->plh_segs) && 2008 atomic_read(&lo->plh_outstanding) != 0) { 2009 spin_unlock(&ino->i_lock); 2010 lseg = ERR_PTR(wait_var_event_killable(&lo->plh_outstanding, 2011 !atomic_read(&lo->plh_outstanding))); 2012 if (IS_ERR(lseg)) 2013 goto out_put_layout_hdr; 2014 pnfs_put_layout_hdr(lo); 2015 goto lookup_again; 2016 } 2017 2018 lseg = pnfs_find_lseg(lo, &arg, strict_iomode); 2019 if (lseg) { 2020 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2021 PNFS_UPDATE_LAYOUT_FOUND_CACHED); 2022 goto out_unlock; 2023 } 2024 2025 /* 2026 * Choose a stateid for the LAYOUTGET. If we don't have a layout 2027 * stateid, or it has been invalidated, then we must use the open 2028 * stateid. 2029 */ 2030 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { 2031 int status; 2032 2033 /* 2034 * The first layoutget for the file. Need to serialize per 2035 * RFC 5661 Errata 3208. 2036 */ 2037 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, 2038 &lo->plh_flags)) { 2039 spin_unlock(&ino->i_lock); 2040 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, 2041 NFS_LAYOUT_FIRST_LAYOUTGET, 2042 TASK_KILLABLE)); 2043 if (IS_ERR(lseg)) 2044 goto out_put_layout_hdr; 2045 pnfs_put_layout_hdr(lo); 2046 dprintk("%s retrying\n", __func__); 2047 goto lookup_again; 2048 } 2049 2050 spin_unlock(&ino->i_lock); 2051 first = true; 2052 status = nfs4_select_rw_stateid(ctx->state, 2053 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ, 2054 NULL, &stateid, NULL); 2055 if (status != 0) { 2056 lseg = ERR_PTR(status); 2057 trace_pnfs_update_layout(ino, pos, count, 2058 iomode, lo, lseg, 2059 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 2060 nfs4_schedule_stateid_recovery(server, ctx->state); 2061 pnfs_clear_first_layoutget(lo); 2062 pnfs_put_layout_hdr(lo); 2063 goto lookup_again; 2064 } 2065 spin_lock(&ino->i_lock); 2066 } else { 2067 nfs4_stateid_copy(&stateid, &lo->plh_stateid); 2068 } 2069 2070 /* 2071 * Because we free lsegs before sending LAYOUTRETURN, we need to wait 2072 * for LAYOUTRETURN even if first is true. 2073 */ 2074 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 2075 spin_unlock(&ino->i_lock); 2076 dprintk("%s wait for layoutreturn\n", __func__); 2077 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo)); 2078 if (!IS_ERR(lseg)) { 2079 if (first) 2080 pnfs_clear_first_layoutget(lo); 2081 pnfs_put_layout_hdr(lo); 2082 dprintk("%s retrying\n", __func__); 2083 trace_pnfs_update_layout(ino, pos, count, iomode, lo, 2084 lseg, PNFS_UPDATE_LAYOUT_RETRY); 2085 goto lookup_again; 2086 } 2087 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2088 PNFS_UPDATE_LAYOUT_RETURN); 2089 goto out_put_layout_hdr; 2090 } 2091 2092 if (pnfs_layoutgets_blocked(lo)) { 2093 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2094 PNFS_UPDATE_LAYOUT_BLOCKED); 2095 goto out_unlock; 2096 } 2097 nfs_layoutget_begin(lo); 2098 spin_unlock(&ino->i_lock); 2099 2100 _add_to_server_list(lo, server); 2101 2102 pg_offset = arg.offset & ~PAGE_MASK; 2103 if (pg_offset) { 2104 arg.offset -= pg_offset; 2105 arg.length += pg_offset; 2106 } 2107 if (arg.length != NFS4_MAX_UINT64) 2108 arg.length = PAGE_ALIGN(arg.length); 2109 2110 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags); 2111 if (!lgp) { 2112 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL, 2113 PNFS_UPDATE_LAYOUT_NOMEM); 2114 nfs_layoutget_end(lo); 2115 goto out_put_layout_hdr; 2116 } 2117 2118 lseg = nfs4_proc_layoutget(lgp, &timeout); 2119 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2120 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); 2121 nfs_layoutget_end(lo); 2122 if (IS_ERR(lseg)) { 2123 switch(PTR_ERR(lseg)) { 2124 case -EBUSY: 2125 if (time_after(jiffies, giveup)) 2126 lseg = NULL; 2127 break; 2128 case -ERECALLCONFLICT: 2129 case -EAGAIN: 2130 break; 2131 default: 2132 if (!nfs_error_is_fatal(PTR_ERR(lseg))) { 2133 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2134 lseg = NULL; 2135 } 2136 goto out_put_layout_hdr; 2137 } 2138 if (lseg) { 2139 if (first) 2140 pnfs_clear_first_layoutget(lo); 2141 trace_pnfs_update_layout(ino, pos, count, 2142 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); 2143 pnfs_put_layout_hdr(lo); 2144 goto lookup_again; 2145 } 2146 } else { 2147 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2148 } 2149 2150 out_put_layout_hdr: 2151 if (first) 2152 pnfs_clear_first_layoutget(lo); 2153 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2154 PNFS_UPDATE_LAYOUT_EXIT); 2155 pnfs_put_layout_hdr(lo); 2156 out: 2157 dprintk("%s: inode %s/%llu pNFS layout segment %s for " 2158 "(%s, offset: %llu, length: %llu)\n", 2159 __func__, ino->i_sb->s_id, 2160 (unsigned long long)NFS_FILEID(ino), 2161 IS_ERR_OR_NULL(lseg) ? "not found" : "found", 2162 iomode==IOMODE_RW ? "read/write" : "read-only", 2163 (unsigned long long)pos, 2164 (unsigned long long)count); 2165 return lseg; 2166 out_unlock: 2167 spin_unlock(&ino->i_lock); 2168 goto out_put_layout_hdr; 2169 } 2170 EXPORT_SYMBOL_GPL(pnfs_update_layout); 2171 2172 static bool 2173 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) 2174 { 2175 switch (range->iomode) { 2176 case IOMODE_READ: 2177 case IOMODE_RW: 2178 break; 2179 default: 2180 return false; 2181 } 2182 if (range->offset == NFS4_MAX_UINT64) 2183 return false; 2184 if (range->length == 0) 2185 return false; 2186 if (range->length != NFS4_MAX_UINT64 && 2187 range->length > NFS4_MAX_UINT64 - range->offset) 2188 return false; 2189 return true; 2190 } 2191 2192 static struct pnfs_layout_hdr * 2193 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx) 2194 { 2195 struct pnfs_layout_hdr *lo; 2196 2197 spin_lock(&ino->i_lock); 2198 lo = pnfs_find_alloc_layout(ino, ctx, GFP_KERNEL); 2199 if (!lo) 2200 goto out_unlock; 2201 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) 2202 goto out_unlock; 2203 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) 2204 goto out_unlock; 2205 if (pnfs_layoutgets_blocked(lo)) 2206 goto out_unlock; 2207 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) 2208 goto out_unlock; 2209 nfs_layoutget_begin(lo); 2210 spin_unlock(&ino->i_lock); 2211 _add_to_server_list(lo, NFS_SERVER(ino)); 2212 return lo; 2213 2214 out_unlock: 2215 spin_unlock(&ino->i_lock); 2216 pnfs_put_layout_hdr(lo); 2217 return NULL; 2218 } 2219 2220 static void _lgopen_prepare_attached(struct nfs4_opendata *data, 2221 struct nfs_open_context *ctx) 2222 { 2223 struct inode *ino = data->dentry->d_inode; 2224 struct pnfs_layout_range rng = { 2225 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2226 IOMODE_RW: IOMODE_READ, 2227 .offset = 0, 2228 .length = NFS4_MAX_UINT64, 2229 }; 2230 struct nfs4_layoutget *lgp; 2231 struct pnfs_layout_hdr *lo; 2232 2233 /* Heuristic: don't send layoutget if we have cached data */ 2234 if (rng.iomode == IOMODE_READ && 2235 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0)) 2236 return; 2237 2238 lo = _pnfs_grab_empty_layout(ino, ctx); 2239 if (!lo) 2240 return; 2241 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, 2242 &rng, GFP_KERNEL); 2243 if (!lgp) { 2244 pnfs_clear_first_layoutget(lo); 2245 pnfs_put_layout_hdr(lo); 2246 return; 2247 } 2248 data->lgp = lgp; 2249 data->o_arg.lg_args = &lgp->args; 2250 data->o_res.lg_res = &lgp->res; 2251 } 2252 2253 static void _lgopen_prepare_floating(struct nfs4_opendata *data, 2254 struct nfs_open_context *ctx) 2255 { 2256 struct pnfs_layout_range rng = { 2257 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2258 IOMODE_RW: IOMODE_READ, 2259 .offset = 0, 2260 .length = NFS4_MAX_UINT64, 2261 }; 2262 struct nfs4_layoutget *lgp; 2263 2264 lgp = pnfs_alloc_init_layoutget_args(NULL, ctx, ¤t_stateid, 2265 &rng, GFP_KERNEL); 2266 if (!lgp) 2267 return; 2268 data->lgp = lgp; 2269 data->o_arg.lg_args = &lgp->args; 2270 data->o_res.lg_res = &lgp->res; 2271 } 2272 2273 void pnfs_lgopen_prepare(struct nfs4_opendata *data, 2274 struct nfs_open_context *ctx) 2275 { 2276 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 2277 2278 if (!(pnfs_enabled_sb(server) && 2279 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN)) 2280 return; 2281 /* Could check on max_ops, but currently hardcoded high enough */ 2282 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN)) 2283 return; 2284 if (data->state) 2285 _lgopen_prepare_attached(data, ctx); 2286 else 2287 _lgopen_prepare_floating(data, ctx); 2288 } 2289 2290 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp, 2291 struct nfs_open_context *ctx) 2292 { 2293 struct pnfs_layout_hdr *lo; 2294 struct pnfs_layout_segment *lseg; 2295 struct nfs_server *srv = NFS_SERVER(ino); 2296 u32 iomode; 2297 2298 if (!lgp) 2299 return; 2300 dprintk("%s: entered with status %i\n", __func__, lgp->res.status); 2301 if (lgp->res.status) { 2302 switch (lgp->res.status) { 2303 default: 2304 break; 2305 /* 2306 * Halt lgopen attempts if the server doesn't recognise 2307 * the "current stateid" value, the layout type, or the 2308 * layoutget operation as being valid. 2309 * Also if it complains about too many ops in the compound 2310 * or of the request/reply being too big. 2311 */ 2312 case -NFS4ERR_BAD_STATEID: 2313 case -NFS4ERR_NOTSUPP: 2314 case -NFS4ERR_REP_TOO_BIG: 2315 case -NFS4ERR_REP_TOO_BIG_TO_CACHE: 2316 case -NFS4ERR_REQ_TOO_BIG: 2317 case -NFS4ERR_TOO_MANY_OPS: 2318 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 2319 srv->caps &= ~NFS_CAP_LGOPEN; 2320 } 2321 return; 2322 } 2323 if (!lgp->args.inode) { 2324 lo = _pnfs_grab_empty_layout(ino, ctx); 2325 if (!lo) 2326 return; 2327 lgp->args.inode = ino; 2328 } else 2329 lo = NFS_I(lgp->args.inode)->layout; 2330 2331 lseg = pnfs_layout_process(lgp); 2332 if (!IS_ERR(lseg)) { 2333 iomode = lgp->args.range.iomode; 2334 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2335 pnfs_put_lseg(lseg); 2336 } 2337 } 2338 2339 void nfs4_lgopen_release(struct nfs4_layoutget *lgp) 2340 { 2341 if (lgp != NULL) { 2342 struct inode *inode = lgp->args.inode; 2343 if (inode) { 2344 struct pnfs_layout_hdr *lo = NFS_I(inode)->layout; 2345 pnfs_clear_first_layoutget(lo); 2346 nfs_layoutget_end(lo); 2347 } 2348 pnfs_layoutget_free(lgp); 2349 } 2350 } 2351 2352 struct pnfs_layout_segment * 2353 pnfs_layout_process(struct nfs4_layoutget *lgp) 2354 { 2355 struct pnfs_layout_hdr *lo = NFS_I(lgp->args.inode)->layout; 2356 struct nfs4_layoutget_res *res = &lgp->res; 2357 struct pnfs_layout_segment *lseg; 2358 struct inode *ino = lo->plh_inode; 2359 LIST_HEAD(free_me); 2360 2361 if (!pnfs_sanity_check_layout_range(&res->range)) 2362 return ERR_PTR(-EINVAL); 2363 2364 /* Inject layout blob into I/O device driver */ 2365 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); 2366 if (IS_ERR_OR_NULL(lseg)) { 2367 if (!lseg) 2368 lseg = ERR_PTR(-ENOMEM); 2369 2370 dprintk("%s: Could not allocate layout: error %ld\n", 2371 __func__, PTR_ERR(lseg)); 2372 return lseg; 2373 } 2374 2375 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid); 2376 2377 spin_lock(&ino->i_lock); 2378 if (pnfs_layoutgets_blocked(lo)) { 2379 dprintk("%s forget reply due to state\n", __func__); 2380 goto out_forget; 2381 } 2382 2383 if (!pnfs_layout_is_valid(lo)) { 2384 /* We have a completely new layout */ 2385 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true); 2386 } else if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { 2387 /* existing state ID, make sure the sequence number matches. */ 2388 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { 2389 dprintk("%s forget reply due to sequence\n", __func__); 2390 goto out_forget; 2391 } 2392 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false); 2393 } else { 2394 /* 2395 * We got an entirely new state ID. Mark all segments for the 2396 * inode invalid, and retry the layoutget 2397 */ 2398 pnfs_mark_layout_stateid_invalid(lo, &free_me); 2399 goto out_forget; 2400 } 2401 2402 pnfs_get_lseg(lseg); 2403 pnfs_layout_insert_lseg(lo, lseg, &free_me); 2404 2405 2406 if (res->return_on_close) 2407 set_bit(NFS_LSEG_ROC, &lseg->pls_flags); 2408 2409 spin_unlock(&ino->i_lock); 2410 pnfs_free_lseg_list(&free_me); 2411 return lseg; 2412 2413 out_forget: 2414 spin_unlock(&ino->i_lock); 2415 lseg->pls_layout = lo; 2416 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 2417 return ERR_PTR(-EAGAIN); 2418 } 2419 2420 /** 2421 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments 2422 * @lo: pointer to layout header 2423 * @tmp_list: list header to be used with pnfs_free_lseg_list() 2424 * @return_range: describe layout segment ranges to be returned 2425 * @seq: stateid seqid to match 2426 * 2427 * This function is mainly intended for use by layoutrecall. It attempts 2428 * to free the layout segment immediately, or else to mark it for return 2429 * as soon as its reference count drops to zero. 2430 * 2431 * Returns 2432 * - 0: a layoutreturn needs to be scheduled. 2433 * - EBUSY: there are layout segment that are still in use. 2434 * - ENOENT: there are no layout segments that need to be returned. 2435 */ 2436 int 2437 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 2438 struct list_head *tmp_list, 2439 const struct pnfs_layout_range *return_range, 2440 u32 seq) 2441 { 2442 struct pnfs_layout_segment *lseg, *next; 2443 int remaining = 0; 2444 2445 dprintk("%s:Begin lo %p\n", __func__, lo); 2446 2447 assert_spin_locked(&lo->plh_inode->i_lock); 2448 2449 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 2450 if (pnfs_match_lseg_recall(lseg, return_range, seq)) { 2451 dprintk("%s: marking lseg %p iomode %d " 2452 "offset %llu length %llu\n", __func__, 2453 lseg, lseg->pls_range.iomode, 2454 lseg->pls_range.offset, 2455 lseg->pls_range.length); 2456 if (mark_lseg_invalid(lseg, tmp_list)) 2457 continue; 2458 remaining++; 2459 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 2460 } 2461 2462 if (remaining) { 2463 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2464 return -EBUSY; 2465 } 2466 2467 if (!list_empty(&lo->plh_return_segs)) { 2468 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2469 return 0; 2470 } 2471 2472 return -ENOENT; 2473 } 2474 2475 static void 2476 pnfs_mark_layout_for_return(struct inode *inode, 2477 const struct pnfs_layout_range *range) 2478 { 2479 struct pnfs_layout_hdr *lo; 2480 bool return_now = false; 2481 2482 spin_lock(&inode->i_lock); 2483 lo = NFS_I(inode)->layout; 2484 if (!pnfs_layout_is_valid(lo)) { 2485 spin_unlock(&inode->i_lock); 2486 return; 2487 } 2488 pnfs_set_plh_return_info(lo, range->iomode, 0); 2489 /* 2490 * mark all matching lsegs so that we are sure to have no live 2491 * segments at hand when sending layoutreturn. See pnfs_put_lseg() 2492 * for how it works. 2493 */ 2494 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) { 2495 const struct cred *cred; 2496 nfs4_stateid stateid; 2497 enum pnfs_iomode iomode; 2498 2499 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); 2500 spin_unlock(&inode->i_lock); 2501 if (return_now) 2502 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false); 2503 } else { 2504 spin_unlock(&inode->i_lock); 2505 nfs_commit_inode(inode, 0); 2506 } 2507 } 2508 2509 void pnfs_error_mark_layout_for_return(struct inode *inode, 2510 struct pnfs_layout_segment *lseg) 2511 { 2512 struct pnfs_layout_range range = { 2513 .iomode = lseg->pls_range.iomode, 2514 .offset = 0, 2515 .length = NFS4_MAX_UINT64, 2516 }; 2517 2518 pnfs_mark_layout_for_return(inode, &range); 2519 } 2520 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); 2521 2522 static bool 2523 pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo) 2524 { 2525 return pnfs_layout_is_valid(lo) && 2526 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) && 2527 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 2528 } 2529 2530 static struct pnfs_layout_segment * 2531 pnfs_find_first_lseg(struct pnfs_layout_hdr *lo, 2532 const struct pnfs_layout_range *range, 2533 enum pnfs_iomode iomode) 2534 { 2535 struct pnfs_layout_segment *lseg; 2536 2537 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 2538 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) 2539 continue; 2540 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 2541 continue; 2542 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY) 2543 continue; 2544 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range)) 2545 return lseg; 2546 } 2547 return NULL; 2548 } 2549 2550 /* Find open file states whose mode matches that of the range */ 2551 static bool 2552 pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo, 2553 const struct pnfs_layout_range *range) 2554 { 2555 struct list_head *head; 2556 struct nfs_open_context *ctx; 2557 fmode_t mode = 0; 2558 2559 if (!pnfs_layout_can_be_returned(lo) || 2560 !pnfs_find_first_lseg(lo, range, range->iomode)) 2561 return false; 2562 2563 head = &NFS_I(lo->plh_inode)->open_files; 2564 list_for_each_entry_rcu(ctx, head, list) { 2565 if (ctx->state) 2566 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE); 2567 } 2568 2569 switch (range->iomode) { 2570 default: 2571 break; 2572 case IOMODE_READ: 2573 mode &= ~FMODE_WRITE; 2574 break; 2575 case IOMODE_RW: 2576 if (pnfs_find_first_lseg(lo, range, IOMODE_READ)) 2577 mode &= ~FMODE_READ; 2578 } 2579 return mode == 0; 2580 } 2581 2582 static int 2583 pnfs_layout_return_unused_byserver(struct nfs_server *server, void *data) 2584 { 2585 const struct pnfs_layout_range *range = data; 2586 struct pnfs_layout_hdr *lo; 2587 struct inode *inode; 2588 restart: 2589 rcu_read_lock(); 2590 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 2591 if (!pnfs_layout_can_be_returned(lo) || 2592 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 2593 continue; 2594 inode = lo->plh_inode; 2595 spin_lock(&inode->i_lock); 2596 if (!pnfs_should_return_unused_layout(lo, range)) { 2597 spin_unlock(&inode->i_lock); 2598 continue; 2599 } 2600 spin_unlock(&inode->i_lock); 2601 inode = pnfs_grab_inode_layout_hdr(lo); 2602 if (!inode) 2603 continue; 2604 rcu_read_unlock(); 2605 pnfs_mark_layout_for_return(inode, range); 2606 iput(inode); 2607 cond_resched(); 2608 goto restart; 2609 } 2610 rcu_read_unlock(); 2611 return 0; 2612 } 2613 2614 void 2615 pnfs_layout_return_unused_byclid(struct nfs_client *clp, 2616 enum pnfs_iomode iomode) 2617 { 2618 struct pnfs_layout_range range = { 2619 .iomode = iomode, 2620 .offset = 0, 2621 .length = NFS4_MAX_UINT64, 2622 }; 2623 2624 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver, 2625 &range); 2626 } 2627 2628 void 2629 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio) 2630 { 2631 if (pgio->pg_lseg == NULL || 2632 test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags)) 2633 return; 2634 pnfs_put_lseg(pgio->pg_lseg); 2635 pgio->pg_lseg = NULL; 2636 } 2637 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); 2638 2639 /* 2640 * Check for any intersection between the request and the pgio->pg_lseg, 2641 * and if none, put this pgio->pg_lseg away. 2642 */ 2643 void 2644 pnfs_generic_pg_check_range(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2645 { 2646 if (pgio->pg_lseg && !pnfs_lseg_request_intersecting(pgio->pg_lseg, req)) { 2647 pnfs_put_lseg(pgio->pg_lseg); 2648 pgio->pg_lseg = NULL; 2649 } 2650 } 2651 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_range); 2652 2653 void 2654 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2655 { 2656 u64 rd_size = req->wb_bytes; 2657 2658 pnfs_generic_pg_check_layout(pgio); 2659 pnfs_generic_pg_check_range(pgio, req); 2660 if (pgio->pg_lseg == NULL) { 2661 if (pgio->pg_dreq == NULL) 2662 rd_size = i_size_read(pgio->pg_inode) - req_offset(req); 2663 else 2664 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq); 2665 2666 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 2667 nfs_req_openctx(req), 2668 req_offset(req), 2669 rd_size, 2670 IOMODE_READ, 2671 false, 2672 GFP_KERNEL); 2673 if (IS_ERR(pgio->pg_lseg)) { 2674 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2675 pgio->pg_lseg = NULL; 2676 return; 2677 } 2678 } 2679 /* If no lseg, fall back to read through mds */ 2680 if (pgio->pg_lseg == NULL) 2681 nfs_pageio_reset_read_mds(pgio); 2682 2683 } 2684 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); 2685 2686 void 2687 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 2688 struct nfs_page *req, u64 wb_size) 2689 { 2690 pnfs_generic_pg_check_layout(pgio); 2691 pnfs_generic_pg_check_range(pgio, req); 2692 if (pgio->pg_lseg == NULL) { 2693 pgio->pg_lseg = pnfs_update_layout(pgio->pg_inode, 2694 nfs_req_openctx(req), 2695 req_offset(req), 2696 wb_size, 2697 IOMODE_RW, 2698 false, 2699 GFP_KERNEL); 2700 if (IS_ERR(pgio->pg_lseg)) { 2701 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2702 pgio->pg_lseg = NULL; 2703 return; 2704 } 2705 } 2706 /* If no lseg, fall back to write through mds */ 2707 if (pgio->pg_lseg == NULL) 2708 nfs_pageio_reset_write_mds(pgio); 2709 } 2710 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); 2711 2712 void 2713 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) 2714 { 2715 if (desc->pg_lseg) { 2716 pnfs_put_lseg(desc->pg_lseg); 2717 desc->pg_lseg = NULL; 2718 } 2719 } 2720 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); 2721 2722 /* 2723 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 2724 * of bytes (maximum @req->wb_bytes) that can be coalesced. 2725 */ 2726 size_t 2727 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 2728 struct nfs_page *prev, struct nfs_page *req) 2729 { 2730 unsigned int size; 2731 u64 seg_end, req_start, seg_left; 2732 2733 size = nfs_generic_pg_test(pgio, prev, req); 2734 if (!size) 2735 return 0; 2736 2737 /* 2738 * 'size' contains the number of bytes left in the current page (up 2739 * to the original size asked for in @req->wb_bytes). 2740 * 2741 * Calculate how many bytes are left in the layout segment 2742 * and if there are less bytes than 'size', return that instead. 2743 * 2744 * Please also note that 'end_offset' is actually the offset of the 2745 * first byte that lies outside the pnfs_layout_range. FIXME? 2746 * 2747 */ 2748 if (pgio->pg_lseg) { 2749 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset, 2750 pgio->pg_lseg->pls_range.length); 2751 req_start = req_offset(req); 2752 2753 /* start of request is past the last byte of this segment */ 2754 if (req_start >= seg_end) 2755 return 0; 2756 2757 /* adjust 'size' iff there are fewer bytes left in the 2758 * segment than what nfs_generic_pg_test returned */ 2759 seg_left = seg_end - req_start; 2760 if (seg_left < size) 2761 size = (unsigned int)seg_left; 2762 } 2763 2764 return size; 2765 } 2766 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); 2767 2768 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) 2769 { 2770 struct nfs_pageio_descriptor pgio; 2771 2772 /* Resend all requests through the MDS */ 2773 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, 2774 hdr->completion_ops); 2775 set_bit(NFS_CONTEXT_RESEND_WRITES, &hdr->args.context->flags); 2776 return nfs_pageio_resend(&pgio, hdr); 2777 } 2778 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); 2779 2780 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) 2781 { 2782 2783 dprintk("pnfs write error = %d\n", hdr->pnfs_error); 2784 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2785 PNFS_LAYOUTRET_ON_ERROR) { 2786 pnfs_return_layout(hdr->inode); 2787 } 2788 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2789 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); 2790 } 2791 2792 /* 2793 * Called by non rpc-based layout drivers 2794 */ 2795 void pnfs_ld_write_done(struct nfs_pgio_header *hdr) 2796 { 2797 if (likely(!hdr->pnfs_error)) { 2798 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, 2799 hdr->mds_offset + hdr->res.count); 2800 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2801 } 2802 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); 2803 if (unlikely(hdr->pnfs_error)) 2804 pnfs_ld_handle_write_error(hdr); 2805 hdr->mds_ops->rpc_release(hdr); 2806 } 2807 EXPORT_SYMBOL_GPL(pnfs_ld_write_done); 2808 2809 static void 2810 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, 2811 struct nfs_pgio_header *hdr) 2812 { 2813 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2814 2815 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2816 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2817 nfs_pageio_reset_write_mds(desc); 2818 mirror->pg_recoalesce = 1; 2819 } 2820 hdr->completion_ops->completion(hdr); 2821 } 2822 2823 static enum pnfs_try_status 2824 pnfs_try_to_write_data(struct nfs_pgio_header *hdr, 2825 const struct rpc_call_ops *call_ops, 2826 struct pnfs_layout_segment *lseg, 2827 int how) 2828 { 2829 struct inode *inode = hdr->inode; 2830 enum pnfs_try_status trypnfs; 2831 struct nfs_server *nfss = NFS_SERVER(inode); 2832 2833 hdr->mds_ops = call_ops; 2834 2835 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, 2836 inode->i_ino, hdr->args.count, hdr->args.offset, how); 2837 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); 2838 if (trypnfs != PNFS_NOT_ATTEMPTED) 2839 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); 2840 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2841 return trypnfs; 2842 } 2843 2844 static void 2845 pnfs_do_write(struct nfs_pageio_descriptor *desc, 2846 struct nfs_pgio_header *hdr, int how) 2847 { 2848 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2849 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2850 enum pnfs_try_status trypnfs; 2851 2852 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); 2853 switch (trypnfs) { 2854 case PNFS_NOT_ATTEMPTED: 2855 pnfs_write_through_mds(desc, hdr); 2856 case PNFS_ATTEMPTED: 2857 break; 2858 case PNFS_TRY_AGAIN: 2859 /* cleanup hdr and prepare to redo pnfs */ 2860 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2861 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2862 list_splice_init(&hdr->pages, &mirror->pg_list); 2863 mirror->pg_recoalesce = 1; 2864 } 2865 hdr->mds_ops->rpc_release(hdr); 2866 } 2867 } 2868 2869 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) 2870 { 2871 pnfs_put_lseg(hdr->lseg); 2872 nfs_pgio_header_free(hdr); 2873 } 2874 2875 int 2876 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 2877 { 2878 struct nfs_pgio_header *hdr; 2879 int ret; 2880 2881 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2882 if (!hdr) { 2883 desc->pg_error = -ENOMEM; 2884 return desc->pg_error; 2885 } 2886 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); 2887 2888 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 2889 ret = nfs_generic_pgio(desc, hdr); 2890 if (!ret) 2891 pnfs_do_write(desc, hdr, desc->pg_ioflags); 2892 2893 return ret; 2894 } 2895 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); 2896 2897 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) 2898 { 2899 struct nfs_pageio_descriptor pgio; 2900 2901 /* Resend all requests through the MDS */ 2902 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); 2903 return nfs_pageio_resend(&pgio, hdr); 2904 } 2905 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); 2906 2907 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) 2908 { 2909 dprintk("pnfs read error = %d\n", hdr->pnfs_error); 2910 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2911 PNFS_LAYOUTRET_ON_ERROR) { 2912 pnfs_return_layout(hdr->inode); 2913 } 2914 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2915 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); 2916 } 2917 2918 /* 2919 * Called by non rpc-based layout drivers 2920 */ 2921 void pnfs_ld_read_done(struct nfs_pgio_header *hdr) 2922 { 2923 if (likely(!hdr->pnfs_error)) 2924 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2925 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); 2926 if (unlikely(hdr->pnfs_error)) 2927 pnfs_ld_handle_read_error(hdr); 2928 hdr->mds_ops->rpc_release(hdr); 2929 } 2930 EXPORT_SYMBOL_GPL(pnfs_ld_read_done); 2931 2932 static void 2933 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, 2934 struct nfs_pgio_header *hdr) 2935 { 2936 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2937 2938 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2939 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2940 nfs_pageio_reset_read_mds(desc); 2941 mirror->pg_recoalesce = 1; 2942 } 2943 hdr->completion_ops->completion(hdr); 2944 } 2945 2946 /* 2947 * Call the appropriate parallel I/O subsystem read function. 2948 */ 2949 static enum pnfs_try_status 2950 pnfs_try_to_read_data(struct nfs_pgio_header *hdr, 2951 const struct rpc_call_ops *call_ops, 2952 struct pnfs_layout_segment *lseg) 2953 { 2954 struct inode *inode = hdr->inode; 2955 struct nfs_server *nfss = NFS_SERVER(inode); 2956 enum pnfs_try_status trypnfs; 2957 2958 hdr->mds_ops = call_ops; 2959 2960 dprintk("%s: Reading ino:%lu %u@%llu\n", 2961 __func__, inode->i_ino, hdr->args.count, hdr->args.offset); 2962 2963 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); 2964 if (trypnfs != PNFS_NOT_ATTEMPTED) 2965 nfs_inc_stats(inode, NFSIOS_PNFS_READ); 2966 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2967 return trypnfs; 2968 } 2969 2970 /* Resend all requests through pnfs. */ 2971 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr, 2972 unsigned int mirror_idx) 2973 { 2974 struct nfs_pageio_descriptor pgio; 2975 2976 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2977 /* Prevent deadlocks with layoutreturn! */ 2978 pnfs_put_lseg(hdr->lseg); 2979 hdr->lseg = NULL; 2980 2981 nfs_pageio_init_read(&pgio, hdr->inode, false, 2982 hdr->completion_ops); 2983 pgio.pg_mirror_idx = mirror_idx; 2984 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr); 2985 } 2986 } 2987 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); 2988 2989 static void 2990 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) 2991 { 2992 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2993 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2994 enum pnfs_try_status trypnfs; 2995 2996 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); 2997 switch (trypnfs) { 2998 case PNFS_NOT_ATTEMPTED: 2999 pnfs_read_through_mds(desc, hdr); 3000 case PNFS_ATTEMPTED: 3001 break; 3002 case PNFS_TRY_AGAIN: 3003 /* cleanup hdr and prepare to redo pnfs */ 3004 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 3005 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 3006 list_splice_init(&hdr->pages, &mirror->pg_list); 3007 mirror->pg_recoalesce = 1; 3008 } 3009 hdr->mds_ops->rpc_release(hdr); 3010 } 3011 } 3012 3013 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) 3014 { 3015 pnfs_put_lseg(hdr->lseg); 3016 nfs_pgio_header_free(hdr); 3017 } 3018 3019 int 3020 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) 3021 { 3022 struct nfs_pgio_header *hdr; 3023 int ret; 3024 3025 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 3026 if (!hdr) { 3027 desc->pg_error = -ENOMEM; 3028 return desc->pg_error; 3029 } 3030 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); 3031 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 3032 ret = nfs_generic_pgio(desc, hdr); 3033 if (!ret) 3034 pnfs_do_read(desc, hdr); 3035 return ret; 3036 } 3037 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); 3038 3039 static void pnfs_clear_layoutcommitting(struct inode *inode) 3040 { 3041 unsigned long *bitlock = &NFS_I(inode)->flags; 3042 3043 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 3044 smp_mb__after_atomic(); 3045 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 3046 } 3047 3048 /* 3049 * There can be multiple RW segments. 3050 */ 3051 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 3052 { 3053 struct pnfs_layout_segment *lseg; 3054 3055 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { 3056 if (lseg->pls_range.iomode == IOMODE_RW && 3057 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 3058 list_add(&lseg->pls_lc_list, listp); 3059 } 3060 } 3061 3062 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) 3063 { 3064 struct pnfs_layout_segment *lseg, *tmp; 3065 3066 /* Matched by references in pnfs_set_layoutcommit */ 3067 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { 3068 list_del_init(&lseg->pls_lc_list); 3069 pnfs_put_lseg(lseg); 3070 } 3071 3072 pnfs_clear_layoutcommitting(inode); 3073 } 3074 3075 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) 3076 { 3077 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); 3078 } 3079 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); 3080 3081 void 3082 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, 3083 loff_t end_pos) 3084 { 3085 struct nfs_inode *nfsi = NFS_I(inode); 3086 bool mark_as_dirty = false; 3087 3088 spin_lock(&inode->i_lock); 3089 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 3090 nfsi->layout->plh_lwb = end_pos; 3091 mark_as_dirty = true; 3092 dprintk("%s: Set layoutcommit for inode %lu ", 3093 __func__, inode->i_ino); 3094 } else if (end_pos > nfsi->layout->plh_lwb) 3095 nfsi->layout->plh_lwb = end_pos; 3096 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { 3097 /* references matched in nfs4_layoutcommit_release */ 3098 pnfs_get_lseg(lseg); 3099 } 3100 spin_unlock(&inode->i_lock); 3101 dprintk("%s: lseg %p end_pos %llu\n", 3102 __func__, lseg, nfsi->layout->plh_lwb); 3103 3104 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one 3105 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ 3106 if (mark_as_dirty) 3107 mark_inode_dirty_sync(inode); 3108 } 3109 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); 3110 3111 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 3112 { 3113 struct nfs_server *nfss = NFS_SERVER(data->args.inode); 3114 3115 if (nfss->pnfs_curr_ld->cleanup_layoutcommit) 3116 nfss->pnfs_curr_ld->cleanup_layoutcommit(data); 3117 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); 3118 } 3119 3120 /* 3121 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and 3122 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough 3123 * data to disk to allow the server to recover the data if it crashes. 3124 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag 3125 * is off, and a COMMIT is sent to a data server, or 3126 * if WRITEs to a data server return NFS_DATA_SYNC. 3127 */ 3128 int 3129 pnfs_layoutcommit_inode(struct inode *inode, bool sync) 3130 { 3131 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 3132 struct nfs4_layoutcommit_data *data; 3133 struct nfs_inode *nfsi = NFS_I(inode); 3134 loff_t end_pos; 3135 int status; 3136 3137 if (!pnfs_layoutcommit_outstanding(inode)) 3138 return 0; 3139 3140 dprintk("--> %s inode %lu\n", __func__, inode->i_ino); 3141 3142 status = -EAGAIN; 3143 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { 3144 if (!sync) 3145 goto out; 3146 status = wait_on_bit_lock_action(&nfsi->flags, 3147 NFS_INO_LAYOUTCOMMITTING, 3148 nfs_wait_bit_killable, 3149 TASK_KILLABLE); 3150 if (status) 3151 goto out; 3152 } 3153 3154 status = -ENOMEM; 3155 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ 3156 data = kzalloc(sizeof(*data), GFP_NOFS); 3157 if (!data) 3158 goto clear_layoutcommitting; 3159 3160 status = 0; 3161 spin_lock(&inode->i_lock); 3162 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 3163 goto out_unlock; 3164 3165 INIT_LIST_HEAD(&data->lseg_list); 3166 pnfs_list_write_lseg(inode, &data->lseg_list); 3167 3168 end_pos = nfsi->layout->plh_lwb; 3169 3170 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); 3171 data->cred = get_cred(nfsi->layout->plh_lc_cred); 3172 spin_unlock(&inode->i_lock); 3173 3174 data->args.inode = inode; 3175 nfs_fattr_init(&data->fattr); 3176 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3177 data->res.fattr = &data->fattr; 3178 if (end_pos != 0) 3179 data->args.lastbytewritten = end_pos - 1; 3180 else 3181 data->args.lastbytewritten = U64_MAX; 3182 data->res.server = NFS_SERVER(inode); 3183 3184 if (ld->prepare_layoutcommit) { 3185 status = ld->prepare_layoutcommit(&data->args); 3186 if (status) { 3187 put_cred(data->cred); 3188 spin_lock(&inode->i_lock); 3189 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); 3190 if (end_pos > nfsi->layout->plh_lwb) 3191 nfsi->layout->plh_lwb = end_pos; 3192 goto out_unlock; 3193 } 3194 } 3195 3196 3197 status = nfs4_proc_layoutcommit(data, sync); 3198 out: 3199 if (status) 3200 mark_inode_dirty_sync(inode); 3201 dprintk("<-- %s status %d\n", __func__, status); 3202 return status; 3203 out_unlock: 3204 spin_unlock(&inode->i_lock); 3205 kfree(data); 3206 clear_layoutcommitting: 3207 pnfs_clear_layoutcommitting(inode); 3208 goto out; 3209 } 3210 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); 3211 3212 int 3213 pnfs_generic_sync(struct inode *inode, bool datasync) 3214 { 3215 return pnfs_layoutcommit_inode(inode, true); 3216 } 3217 EXPORT_SYMBOL_GPL(pnfs_generic_sync); 3218 3219 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 3220 { 3221 struct nfs4_threshold *thp; 3222 3223 thp = kzalloc(sizeof(*thp), GFP_NOFS); 3224 if (!thp) { 3225 dprintk("%s mdsthreshold allocation failed\n", __func__); 3226 return NULL; 3227 } 3228 return thp; 3229 } 3230 3231 #if IS_ENABLED(CONFIG_NFS_V4_2) 3232 int 3233 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 3234 { 3235 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 3236 struct nfs_server *server = NFS_SERVER(inode); 3237 struct nfs_inode *nfsi = NFS_I(inode); 3238 struct nfs42_layoutstat_data *data; 3239 struct pnfs_layout_hdr *hdr; 3240 int status = 0; 3241 3242 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) 3243 goto out; 3244 3245 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) 3246 goto out; 3247 3248 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) 3249 goto out; 3250 3251 spin_lock(&inode->i_lock); 3252 if (!NFS_I(inode)->layout) { 3253 spin_unlock(&inode->i_lock); 3254 goto out_clear_layoutstats; 3255 } 3256 hdr = NFS_I(inode)->layout; 3257 pnfs_get_layout_hdr(hdr); 3258 spin_unlock(&inode->i_lock); 3259 3260 data = kzalloc(sizeof(*data), gfp_flags); 3261 if (!data) { 3262 status = -ENOMEM; 3263 goto out_put; 3264 } 3265 3266 data->args.fh = NFS_FH(inode); 3267 data->args.inode = inode; 3268 status = ld->prepare_layoutstats(&data->args); 3269 if (status) 3270 goto out_free; 3271 3272 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); 3273 3274 out: 3275 dprintk("%s returns %d\n", __func__, status); 3276 return status; 3277 3278 out_free: 3279 kfree(data); 3280 out_put: 3281 pnfs_put_layout_hdr(hdr); 3282 out_clear_layoutstats: 3283 smp_mb__before_atomic(); 3284 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); 3285 smp_mb__after_atomic(); 3286 goto out; 3287 } 3288 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); 3289 #endif 3290 3291 unsigned int layoutstats_timer; 3292 module_param(layoutstats_timer, uint, 0644); 3293 EXPORT_SYMBOL_GPL(layoutstats_timer); 3294