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 const struct pnfs_layoutdriver_type *pnfs_find_layoutdriver(u32 id) 96 { 97 return find_pnfs_driver(id); 98 } 99 100 void pnfs_put_layoutdriver(const struct pnfs_layoutdriver_type *ld) 101 { 102 if (ld) 103 module_put(ld->owner); 104 } 105 106 void 107 unset_pnfs_layoutdriver(struct nfs_server *nfss) 108 { 109 if (nfss->pnfs_curr_ld) { 110 if (nfss->pnfs_curr_ld->clear_layoutdriver) 111 nfss->pnfs_curr_ld->clear_layoutdriver(nfss); 112 /* Decrement the MDS count. Purge the deviceid cache if zero */ 113 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count)) 114 nfs4_deviceid_purge_client(nfss->nfs_client); 115 module_put(nfss->pnfs_curr_ld->owner); 116 } 117 nfss->pnfs_curr_ld = NULL; 118 } 119 120 /* 121 * When the server sends a list of layout types, we choose one in the order 122 * given in the list below. 123 * 124 * FIXME: should this list be configurable in some fashion? module param? 125 * mount option? something else? 126 */ 127 static const u32 ld_prefs[] = { 128 LAYOUT_SCSI, 129 LAYOUT_BLOCK_VOLUME, 130 LAYOUT_OSD2_OBJECTS, 131 LAYOUT_FLEX_FILES, 132 LAYOUT_NFSV4_1_FILES, 133 0 134 }; 135 136 static int 137 ld_cmp(const void *e1, const void *e2) 138 { 139 u32 ld1 = *((u32 *)e1); 140 u32 ld2 = *((u32 *)e2); 141 int i; 142 143 for (i = 0; ld_prefs[i] != 0; i++) { 144 if (ld1 == ld_prefs[i]) 145 return -1; 146 147 if (ld2 == ld_prefs[i]) 148 return 1; 149 } 150 return 0; 151 } 152 153 /* 154 * Try to set the server's pnfs module to the pnfs layout type specified by id. 155 * Currently only one pNFS layout driver per filesystem is supported. 156 * 157 * @ids array of layout types supported by MDS. 158 */ 159 void 160 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, 161 struct nfs_fsinfo *fsinfo) 162 { 163 struct pnfs_layoutdriver_type *ld_type = NULL; 164 u32 id; 165 int i; 166 167 if (fsinfo->nlayouttypes == 0) 168 goto out_no_driver; 169 if (!(server->nfs_client->cl_exchange_flags & 170 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { 171 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n", 172 __func__, server->nfs_client->cl_exchange_flags); 173 goto out_no_driver; 174 } 175 176 sort(fsinfo->layouttype, fsinfo->nlayouttypes, 177 sizeof(*fsinfo->layouttype), ld_cmp, NULL); 178 179 for (i = 0; i < fsinfo->nlayouttypes; i++) { 180 id = fsinfo->layouttype[i]; 181 ld_type = find_pnfs_driver(id); 182 if (!ld_type) { 183 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, 184 id); 185 ld_type = find_pnfs_driver(id); 186 } 187 if (ld_type) 188 break; 189 } 190 191 if (!ld_type) { 192 dprintk("%s: No pNFS module found!\n", __func__); 193 goto out_no_driver; 194 } 195 196 server->pnfs_curr_ld = ld_type; 197 if (ld_type->set_layoutdriver 198 && ld_type->set_layoutdriver(server, mntfh)) { 199 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout " 200 "driver %u.\n", __func__, id); 201 module_put(ld_type->owner); 202 goto out_no_driver; 203 } 204 /* Bump the MDS count */ 205 atomic_inc(&server->nfs_client->cl_mds_count); 206 207 dprintk("%s: pNFS module for %u set\n", __func__, id); 208 return; 209 210 out_no_driver: 211 dprintk("%s: Using NFSv4 I/O\n", __func__); 212 server->pnfs_curr_ld = NULL; 213 } 214 215 int 216 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 217 { 218 int status = -EINVAL; 219 struct pnfs_layoutdriver_type *tmp; 220 221 if (ld_type->id == 0) { 222 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__); 223 return status; 224 } 225 if (!ld_type->alloc_lseg || !ld_type->free_lseg) { 226 printk(KERN_ERR "NFS: %s Layout driver must provide " 227 "alloc_lseg and free_lseg.\n", __func__); 228 return status; 229 } 230 231 spin_lock(&pnfs_spinlock); 232 tmp = find_pnfs_driver_locked(ld_type->id); 233 if (!tmp) { 234 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); 235 status = 0; 236 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, 237 ld_type->name); 238 } else { 239 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n", 240 __func__, ld_type->id); 241 } 242 spin_unlock(&pnfs_spinlock); 243 244 return status; 245 } 246 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); 247 248 void 249 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 250 { 251 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); 252 spin_lock(&pnfs_spinlock); 253 list_del(&ld_type->pnfs_tblid); 254 spin_unlock(&pnfs_spinlock); 255 } 256 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); 257 258 /* 259 * pNFS client layout cache 260 */ 261 262 /* Need to hold i_lock if caller does not already hold reference */ 263 void 264 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo) 265 { 266 refcount_inc(&lo->plh_refcount); 267 } 268 269 static struct pnfs_layout_hdr * 270 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) 271 { 272 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 273 return ld->alloc_layout_hdr(ino, gfp_flags); 274 } 275 276 static void 277 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) 278 { 279 struct nfs_server *server = NFS_SERVER(lo->plh_inode); 280 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; 281 282 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) { 283 struct nfs_client *clp = server->nfs_client; 284 285 spin_lock(&clp->cl_lock); 286 list_del_rcu(&lo->plh_layouts); 287 spin_unlock(&clp->cl_lock); 288 } 289 put_cred(lo->plh_lc_cred); 290 return ld->free_layout_hdr(lo); 291 } 292 293 static void 294 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) 295 { 296 struct nfs_inode *nfsi = NFS_I(lo->plh_inode); 297 dprintk("%s: freeing layout cache %p\n", __func__, lo); 298 nfsi->layout = NULL; 299 /* Reset MDS Threshold I/O counters */ 300 nfsi->write_io = 0; 301 nfsi->read_io = 0; 302 } 303 304 void 305 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) 306 { 307 struct inode *inode; 308 unsigned long i_state; 309 310 if (!lo) 311 return; 312 inode = lo->plh_inode; 313 pnfs_layoutreturn_before_put_layout_hdr(lo); 314 315 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { 316 if (!list_empty(&lo->plh_segs)) 317 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n"); 318 pnfs_detach_layout_hdr(lo); 319 i_state = inode->i_state; 320 spin_unlock(&inode->i_lock); 321 pnfs_free_layout_hdr(lo); 322 /* Notify pnfs_destroy_layout_final() that we're done */ 323 if (i_state & (I_FREEING | I_CLEAR)) 324 wake_up_var(lo); 325 } 326 } 327 328 static struct inode * 329 pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo) 330 { 331 struct inode *inode = igrab(lo->plh_inode); 332 if (inode) 333 return inode; 334 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags); 335 return NULL; 336 } 337 338 /* 339 * Compare 2 layout stateid sequence ids, to see which is newer, 340 * taking into account wraparound issues. 341 */ 342 static bool pnfs_seqid_is_newer(u32 s1, u32 s2) 343 { 344 return (s32)(s1 - s2) > 0; 345 } 346 347 static void pnfs_barrier_update(struct pnfs_layout_hdr *lo, u32 newseq) 348 { 349 if (pnfs_seqid_is_newer(newseq, lo->plh_barrier) || !lo->plh_barrier) 350 lo->plh_barrier = newseq; 351 } 352 353 static void 354 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode, 355 u32 seq) 356 { 357 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode) 358 iomode = IOMODE_ANY; 359 lo->plh_return_iomode = iomode; 360 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); 361 /* 362 * We must set lo->plh_return_seq to avoid livelocks with 363 * pnfs_layout_need_return() 364 */ 365 if (seq == 0) 366 seq = be32_to_cpu(lo->plh_stateid.seqid); 367 if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq)) 368 lo->plh_return_seq = seq; 369 pnfs_barrier_update(lo, seq); 370 } 371 372 static void 373 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo) 374 { 375 struct pnfs_layout_segment *lseg; 376 lo->plh_return_iomode = 0; 377 lo->plh_return_seq = 0; 378 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); 379 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 380 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 381 continue; 382 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 383 } 384 } 385 386 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) 387 { 388 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); 389 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags); 390 smp_mb__after_atomic(); 391 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); 392 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq); 393 } 394 395 static void 396 pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg, 397 struct list_head *free_me) 398 { 399 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags); 400 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 401 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) 402 pnfs_lseg_dec_and_remove_zero(lseg, free_me); 403 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 404 pnfs_lseg_dec_and_remove_zero(lseg, free_me); 405 } 406 407 /* 408 * Update the seqid of a layout stateid after receiving 409 * NFS4ERR_OLD_STATEID 410 */ 411 bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst, 412 struct pnfs_layout_range *dst_range, 413 struct inode *inode) 414 { 415 struct pnfs_layout_hdr *lo; 416 struct pnfs_layout_range range = { 417 .iomode = IOMODE_ANY, 418 .offset = 0, 419 .length = NFS4_MAX_UINT64, 420 }; 421 bool ret = false; 422 LIST_HEAD(head); 423 int err; 424 425 spin_lock(&inode->i_lock); 426 lo = NFS_I(inode)->layout; 427 if (lo && pnfs_layout_is_valid(lo) && 428 nfs4_stateid_match_other(dst, &lo->plh_stateid)) { 429 /* Is our call using the most recent seqid? If so, bump it */ 430 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) { 431 nfs4_stateid_seqid_inc(dst); 432 ret = true; 433 goto out; 434 } 435 /* Try to update the seqid to the most recent */ 436 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0); 437 if (err != -EBUSY) { 438 dst->seqid = lo->plh_stateid.seqid; 439 *dst_range = range; 440 ret = true; 441 } 442 } 443 out: 444 spin_unlock(&inode->i_lock); 445 pnfs_free_lseg_list(&head); 446 return ret; 447 } 448 449 /* 450 * Mark a pnfs_layout_hdr and all associated layout segments as invalid 451 * 452 * In order to continue using the pnfs_layout_hdr, a full recovery 453 * is required. 454 * Note that caller must hold inode->i_lock. 455 */ 456 int 457 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, 458 struct list_head *lseg_list) 459 { 460 struct pnfs_layout_range range = { 461 .iomode = IOMODE_ANY, 462 .offset = 0, 463 .length = NFS4_MAX_UINT64, 464 }; 465 struct pnfs_layout_segment *lseg, *next; 466 467 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 468 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 469 pnfs_clear_lseg_state(lseg, lseg_list); 470 pnfs_clear_layoutreturn_info(lo); 471 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0); 472 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags); 473 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) && 474 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 475 pnfs_clear_layoutreturn_waitbit(lo); 476 return !list_empty(&lo->plh_segs); 477 } 478 479 static int 480 pnfs_iomode_to_fail_bit(u32 iomode) 481 { 482 return iomode == IOMODE_RW ? 483 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; 484 } 485 486 static void 487 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 488 { 489 lo->plh_retry_timestamp = jiffies; 490 if (!test_and_set_bit(fail_bit, &lo->plh_flags)) 491 refcount_inc(&lo->plh_refcount); 492 } 493 494 static void 495 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 496 { 497 if (test_and_clear_bit(fail_bit, &lo->plh_flags)) 498 refcount_dec(&lo->plh_refcount); 499 } 500 501 static void 502 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) 503 { 504 struct inode *inode = lo->plh_inode; 505 struct pnfs_layout_range range = { 506 .iomode = iomode, 507 .offset = 0, 508 .length = NFS4_MAX_UINT64, 509 }; 510 LIST_HEAD(head); 511 512 spin_lock(&inode->i_lock); 513 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 514 pnfs_mark_matching_lsegs_return(lo, &head, &range, 0); 515 spin_unlock(&inode->i_lock); 516 pnfs_free_lseg_list(&head); 517 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, 518 iomode == IOMODE_RW ? "RW" : "READ"); 519 } 520 521 static bool 522 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) 523 { 524 unsigned long start, end; 525 int fail_bit = pnfs_iomode_to_fail_bit(iomode); 526 527 if (test_bit(fail_bit, &lo->plh_flags) == 0) 528 return false; 529 end = jiffies; 530 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; 531 if (!time_in_range(lo->plh_retry_timestamp, start, end)) { 532 /* It is time to retry the failed layoutgets */ 533 pnfs_layout_clear_fail_bit(lo, fail_bit); 534 return false; 535 } 536 return true; 537 } 538 539 static void 540 pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg, 541 const struct pnfs_layout_range *range, 542 const nfs4_stateid *stateid) 543 { 544 INIT_LIST_HEAD(&lseg->pls_list); 545 INIT_LIST_HEAD(&lseg->pls_lc_list); 546 INIT_LIST_HEAD(&lseg->pls_commits); 547 refcount_set(&lseg->pls_refcount, 1); 548 set_bit(NFS_LSEG_VALID, &lseg->pls_flags); 549 lseg->pls_layout = lo; 550 lseg->pls_range = *range; 551 lseg->pls_seq = be32_to_cpu(stateid->seqid); 552 } 553 554 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) 555 { 556 if (lseg != NULL) { 557 struct inode *inode = lseg->pls_layout->plh_inode; 558 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg); 559 } 560 } 561 562 static void 563 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, 564 struct pnfs_layout_segment *lseg) 565 { 566 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 567 list_del_init(&lseg->pls_list); 568 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ 569 refcount_dec(&lo->plh_refcount); 570 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 571 return; 572 if (list_empty(&lo->plh_segs) && 573 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && 574 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 575 if (atomic_read(&lo->plh_outstanding) == 0) 576 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 577 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 578 } 579 } 580 581 static bool 582 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo, 583 struct pnfs_layout_segment *lseg) 584 { 585 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) && 586 pnfs_layout_is_valid(lo)) { 587 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 588 list_move_tail(&lseg->pls_list, &lo->plh_return_segs); 589 return true; 590 } 591 return false; 592 } 593 594 void 595 pnfs_put_lseg(struct pnfs_layout_segment *lseg) 596 { 597 struct pnfs_layout_hdr *lo; 598 struct inode *inode; 599 600 if (!lseg) 601 return; 602 603 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, 604 refcount_read(&lseg->pls_refcount), 605 test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 606 607 lo = lseg->pls_layout; 608 inode = lo->plh_inode; 609 610 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { 611 pnfs_get_layout_hdr(lo); 612 pnfs_layout_remove_lseg(lo, lseg); 613 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg)) 614 lseg = NULL; 615 spin_unlock(&inode->i_lock); 616 pnfs_free_lseg(lseg); 617 pnfs_put_layout_hdr(lo); 618 } 619 } 620 EXPORT_SYMBOL_GPL(pnfs_put_lseg); 621 622 /* 623 * is l2 fully contained in l1? 624 * start1 end1 625 * [----------------------------------) 626 * start2 end2 627 * [----------------) 628 */ 629 static bool 630 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, 631 const struct pnfs_layout_range *l2) 632 { 633 u64 start1 = l1->offset; 634 u64 end1 = pnfs_end_offset(start1, l1->length); 635 u64 start2 = l2->offset; 636 u64 end2 = pnfs_end_offset(start2, l2->length); 637 638 return (start1 <= start2) && (end1 >= end2); 639 } 640 641 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, 642 struct list_head *tmp_list) 643 { 644 if (!refcount_dec_and_test(&lseg->pls_refcount)) 645 return false; 646 pnfs_layout_remove_lseg(lseg->pls_layout, lseg); 647 list_add(&lseg->pls_list, tmp_list); 648 return true; 649 } 650 651 /* Returns 1 if lseg is removed from list, 0 otherwise */ 652 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, 653 struct list_head *tmp_list) 654 { 655 int rv = 0; 656 657 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 658 /* Remove the reference keeping the lseg in the 659 * list. It will now be removed when all 660 * outstanding io is finished. 661 */ 662 dprintk("%s: lseg %p ref %d\n", __func__, lseg, 663 refcount_read(&lseg->pls_refcount)); 664 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) 665 rv = 1; 666 } 667 return rv; 668 } 669 670 static bool 671 pnfs_should_free_range(const struct pnfs_layout_range *lseg_range, 672 const struct pnfs_layout_range *recall_range) 673 { 674 return (recall_range->iomode == IOMODE_ANY || 675 lseg_range->iomode == recall_range->iomode) && 676 pnfs_lseg_range_intersecting(lseg_range, recall_range); 677 } 678 679 static bool 680 pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg, 681 const struct pnfs_layout_range *recall_range, 682 u32 seq) 683 { 684 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq)) 685 return false; 686 if (recall_range == NULL) 687 return true; 688 return pnfs_should_free_range(&lseg->pls_range, recall_range); 689 } 690 691 /** 692 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later 693 * @lo: layout header containing the lsegs 694 * @tmp_list: list head where doomed lsegs should go 695 * @recall_range: optional recall range argument to match (may be NULL) 696 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0) 697 * 698 * Walk the list of lsegs in the layout header, and tear down any that should 699 * be destroyed. If "recall_range" is specified then the segment must match 700 * that range. If "seq" is non-zero, then only match segments that were handed 701 * out at or before that sequence. 702 * 703 * Returns number of matching invalid lsegs remaining in list after scanning 704 * it and purging them. 705 */ 706 int 707 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 708 struct list_head *tmp_list, 709 const struct pnfs_layout_range *recall_range, 710 u32 seq) 711 { 712 struct pnfs_layout_segment *lseg, *next; 713 struct nfs_server *server = NFS_SERVER(lo->plh_inode); 714 int remaining = 0; 715 716 dprintk("%s:Begin lo %p\n", __func__, lo); 717 718 if (list_empty(&lo->plh_segs)) 719 return 0; 720 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 721 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) { 722 dprintk("%s: freeing lseg %p iomode %d seq %u " 723 "offset %llu length %llu\n", __func__, 724 lseg, lseg->pls_range.iomode, lseg->pls_seq, 725 lseg->pls_range.offset, lseg->pls_range.length); 726 if (mark_lseg_invalid(lseg, tmp_list)) 727 continue; 728 remaining++; 729 pnfs_lseg_cancel_io(server, lseg); 730 } 731 dprintk("%s:Return %i\n", __func__, remaining); 732 return remaining; 733 } 734 735 static void 736 pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, 737 struct list_head *free_me, 738 const struct pnfs_layout_range *range, 739 u32 seq) 740 { 741 struct pnfs_layout_segment *lseg, *next; 742 743 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) { 744 if (pnfs_match_lseg_recall(lseg, range, seq)) 745 list_move_tail(&lseg->pls_list, free_me); 746 } 747 } 748 749 /* note free_me must contain lsegs from a single layout_hdr */ 750 void 751 pnfs_free_lseg_list(struct list_head *free_me) 752 { 753 struct pnfs_layout_segment *lseg, *tmp; 754 755 if (list_empty(free_me)) 756 return; 757 758 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { 759 list_del(&lseg->pls_list); 760 pnfs_free_lseg(lseg); 761 } 762 } 763 764 static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi) 765 { 766 struct pnfs_layout_hdr *lo; 767 LIST_HEAD(tmp_list); 768 769 spin_lock(&nfsi->vfs_inode.i_lock); 770 lo = nfsi->layout; 771 if (lo) { 772 pnfs_get_layout_hdr(lo); 773 pnfs_mark_layout_stateid_invalid(lo, &tmp_list); 774 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); 775 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); 776 spin_unlock(&nfsi->vfs_inode.i_lock); 777 pnfs_free_lseg_list(&tmp_list); 778 nfs_commit_inode(&nfsi->vfs_inode, 0); 779 pnfs_put_layout_hdr(lo); 780 } else 781 spin_unlock(&nfsi->vfs_inode.i_lock); 782 return lo; 783 } 784 785 void pnfs_destroy_layout(struct nfs_inode *nfsi) 786 { 787 __pnfs_destroy_layout(nfsi); 788 } 789 EXPORT_SYMBOL_GPL(pnfs_destroy_layout); 790 791 static bool pnfs_layout_removed(struct nfs_inode *nfsi, 792 struct pnfs_layout_hdr *lo) 793 { 794 bool ret; 795 796 spin_lock(&nfsi->vfs_inode.i_lock); 797 ret = nfsi->layout != lo; 798 spin_unlock(&nfsi->vfs_inode.i_lock); 799 return ret; 800 } 801 802 void pnfs_destroy_layout_final(struct nfs_inode *nfsi) 803 { 804 struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi); 805 806 if (lo) 807 wait_var_event(lo, pnfs_layout_removed(nfsi, lo)); 808 } 809 810 static bool 811 pnfs_layout_add_bulk_destroy_list(struct inode *inode, 812 struct list_head *layout_list) 813 { 814 struct pnfs_layout_hdr *lo; 815 bool ret = false; 816 817 spin_lock(&inode->i_lock); 818 lo = NFS_I(inode)->layout; 819 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) { 820 pnfs_get_layout_hdr(lo); 821 list_add(&lo->plh_bulk_destroy, layout_list); 822 ret = true; 823 } 824 spin_unlock(&inode->i_lock); 825 return ret; 826 } 827 828 /* Caller must hold rcu_read_lock and clp->cl_lock */ 829 static int 830 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp, 831 struct nfs_server *server, 832 struct list_head *layout_list) 833 __must_hold(&clp->cl_lock) 834 __must_hold(RCU) 835 { 836 struct pnfs_layout_hdr *lo, *next; 837 struct inode *inode; 838 839 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) { 840 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 841 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) || 842 !list_empty(&lo->plh_bulk_destroy)) 843 continue; 844 /* If the sb is being destroyed, just bail */ 845 if (!nfs_sb_active(server->super)) 846 break; 847 inode = pnfs_grab_inode_layout_hdr(lo); 848 if (inode != NULL) { 849 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) 850 list_del_rcu(&lo->plh_layouts); 851 if (pnfs_layout_add_bulk_destroy_list(inode, 852 layout_list)) 853 continue; 854 rcu_read_unlock(); 855 spin_unlock(&clp->cl_lock); 856 iput(inode); 857 } else { 858 rcu_read_unlock(); 859 spin_unlock(&clp->cl_lock); 860 } 861 nfs_sb_deactive(server->super); 862 spin_lock(&clp->cl_lock); 863 rcu_read_lock(); 864 return -EAGAIN; 865 } 866 return 0; 867 } 868 869 static int 870 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, 871 bool is_bulk_recall) 872 { 873 struct pnfs_layout_hdr *lo; 874 struct inode *inode; 875 LIST_HEAD(lseg_list); 876 int ret = 0; 877 878 while (!list_empty(layout_list)) { 879 lo = list_entry(layout_list->next, struct pnfs_layout_hdr, 880 plh_bulk_destroy); 881 dprintk("%s freeing layout for inode %lu\n", __func__, 882 lo->plh_inode->i_ino); 883 inode = lo->plh_inode; 884 885 pnfs_layoutcommit_inode(inode, false); 886 887 spin_lock(&inode->i_lock); 888 list_del_init(&lo->plh_bulk_destroy); 889 if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) { 890 if (is_bulk_recall) 891 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 892 ret = -EAGAIN; 893 } 894 spin_unlock(&inode->i_lock); 895 pnfs_free_lseg_list(&lseg_list); 896 /* Free all lsegs that are attached to commit buckets */ 897 nfs_commit_inode(inode, 0); 898 pnfs_put_layout_hdr(lo); 899 nfs_iput_and_deactive(inode); 900 } 901 return ret; 902 } 903 904 int 905 pnfs_destroy_layouts_byfsid(struct nfs_client *clp, 906 struct nfs_fsid *fsid, 907 bool is_recall) 908 { 909 struct nfs_server *server; 910 LIST_HEAD(layout_list); 911 912 spin_lock(&clp->cl_lock); 913 rcu_read_lock(); 914 restart: 915 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 916 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0) 917 continue; 918 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 919 server, 920 &layout_list) != 0) 921 goto restart; 922 } 923 rcu_read_unlock(); 924 spin_unlock(&clp->cl_lock); 925 926 if (list_empty(&layout_list)) 927 return 0; 928 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 929 } 930 931 int 932 pnfs_destroy_layouts_byclid(struct nfs_client *clp, 933 bool is_recall) 934 { 935 struct nfs_server *server; 936 LIST_HEAD(layout_list); 937 938 spin_lock(&clp->cl_lock); 939 rcu_read_lock(); 940 restart: 941 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 942 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 943 server, 944 &layout_list) != 0) 945 goto restart; 946 } 947 rcu_read_unlock(); 948 spin_unlock(&clp->cl_lock); 949 950 if (list_empty(&layout_list)) 951 return 0; 952 return pnfs_layout_free_bulk_destroy_list(&layout_list, is_recall); 953 } 954 955 /* 956 * Called by the state manager to remove all layouts established under an 957 * expired lease. 958 */ 959 void 960 pnfs_destroy_all_layouts(struct nfs_client *clp) 961 { 962 nfs4_deviceid_mark_client_invalid(clp); 963 nfs4_deviceid_purge_client(clp); 964 965 pnfs_destroy_layouts_byclid(clp, false); 966 } 967 968 static void 969 pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred) 970 { 971 const struct cred *old; 972 973 if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) { 974 old = xchg(&lo->plh_lc_cred, get_cred(cred)); 975 put_cred(old); 976 } 977 } 978 979 /* update lo->plh_stateid with new if is more recent */ 980 void 981 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, 982 const struct cred *cred, bool update_barrier) 983 { 984 u32 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 985 u32 newseq = be32_to_cpu(new->seqid); 986 987 if (!pnfs_layout_is_valid(lo)) { 988 pnfs_set_layout_cred(lo, cred); 989 nfs4_stateid_copy(&lo->plh_stateid, new); 990 lo->plh_barrier = newseq; 991 pnfs_clear_layoutreturn_info(lo); 992 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 993 return; 994 } 995 996 if (pnfs_seqid_is_newer(newseq, oldseq)) 997 nfs4_stateid_copy(&lo->plh_stateid, new); 998 999 if (update_barrier) { 1000 pnfs_barrier_update(lo, newseq); 1001 return; 1002 } 1003 /* 1004 * Because of wraparound, we want to keep the barrier 1005 * "close" to the current seqids. We really only want to 1006 * get here from a layoutget call. 1007 */ 1008 if (atomic_read(&lo->plh_outstanding) == 1) 1009 pnfs_barrier_update(lo, be32_to_cpu(lo->plh_stateid.seqid)); 1010 } 1011 1012 static bool 1013 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, 1014 const nfs4_stateid *stateid) 1015 { 1016 u32 seqid = be32_to_cpu(stateid->seqid); 1017 1018 return lo->plh_barrier && pnfs_seqid_is_newer(lo->plh_barrier, seqid); 1019 } 1020 1021 /* lget is set to 1 if called from inside send_layoutget call chain */ 1022 static bool 1023 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo) 1024 { 1025 return lo->plh_block_lgets || 1026 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 1027 } 1028 1029 static struct nfs_server * 1030 pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx) 1031 { 1032 struct nfs_server *server; 1033 1034 if (inode) { 1035 server = NFS_SERVER(inode); 1036 } else { 1037 struct dentry *parent_dir = dget_parent(ctx->dentry); 1038 server = NFS_SERVER(parent_dir->d_inode); 1039 dput(parent_dir); 1040 } 1041 return server; 1042 } 1043 1044 static void nfs4_free_pages(struct page **pages, size_t size) 1045 { 1046 int i; 1047 1048 if (!pages) 1049 return; 1050 1051 for (i = 0; i < size; i++) { 1052 if (!pages[i]) 1053 break; 1054 __free_page(pages[i]); 1055 } 1056 kfree(pages); 1057 } 1058 1059 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 1060 { 1061 struct page **pages; 1062 int i; 1063 1064 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags); 1065 if (!pages) { 1066 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 1067 return NULL; 1068 } 1069 1070 for (i = 0; i < size; i++) { 1071 pages[i] = alloc_page(gfp_flags); 1072 if (!pages[i]) { 1073 dprintk("%s: failed to allocate page\n", __func__); 1074 nfs4_free_pages(pages, i); 1075 return NULL; 1076 } 1077 } 1078 1079 return pages; 1080 } 1081 1082 static struct nfs4_layoutget * 1083 pnfs_alloc_init_layoutget_args(struct inode *ino, 1084 struct nfs_open_context *ctx, 1085 const nfs4_stateid *stateid, 1086 const struct pnfs_layout_range *range, 1087 gfp_t gfp_flags) 1088 { 1089 struct nfs_server *server = pnfs_find_server(ino, ctx); 1090 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response; 1091 size_t max_pages = max_response_pages(server); 1092 struct nfs4_layoutget *lgp; 1093 1094 dprintk("--> %s\n", __func__); 1095 1096 lgp = kzalloc(sizeof(*lgp), gfp_flags); 1097 if (lgp == NULL) 1098 return NULL; 1099 1100 if (max_reply_sz) { 1101 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT; 1102 if (npages < max_pages) 1103 max_pages = npages; 1104 } 1105 1106 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 1107 if (!lgp->args.layout.pages) { 1108 kfree(lgp); 1109 return NULL; 1110 } 1111 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 1112 lgp->res.layoutp = &lgp->args.layout; 1113 1114 /* Don't confuse uninitialised result and success */ 1115 lgp->res.status = -NFS4ERR_DELAY; 1116 1117 lgp->args.minlength = PAGE_SIZE; 1118 if (lgp->args.minlength > range->length) 1119 lgp->args.minlength = range->length; 1120 if (ino) { 1121 loff_t i_size = i_size_read(ino); 1122 1123 if (range->iomode == IOMODE_READ) { 1124 if (range->offset >= i_size) 1125 lgp->args.minlength = 0; 1126 else if (i_size - range->offset < lgp->args.minlength) 1127 lgp->args.minlength = i_size - range->offset; 1128 } 1129 } 1130 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; 1131 pnfs_copy_range(&lgp->args.range, range); 1132 lgp->args.type = server->pnfs_curr_ld->id; 1133 lgp->args.inode = ino; 1134 lgp->args.ctx = get_nfs_open_context(ctx); 1135 nfs4_stateid_copy(&lgp->args.stateid, stateid); 1136 lgp->gfp_flags = gfp_flags; 1137 lgp->cred = ctx->cred; 1138 return lgp; 1139 } 1140 1141 void pnfs_layoutget_free(struct nfs4_layoutget *lgp) 1142 { 1143 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE; 1144 1145 nfs4_free_pages(lgp->args.layout.pages, max_pages); 1146 pnfs_put_layout_hdr(lgp->lo); 1147 put_nfs_open_context(lgp->args.ctx); 1148 kfree(lgp); 1149 } 1150 1151 static void pnfs_clear_layoutcommit(struct inode *inode, 1152 struct list_head *head) 1153 { 1154 struct nfs_inode *nfsi = NFS_I(inode); 1155 struct pnfs_layout_segment *lseg, *tmp; 1156 1157 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 1158 return; 1159 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { 1160 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 1161 continue; 1162 pnfs_lseg_dec_and_remove_zero(lseg, head); 1163 } 1164 } 1165 1166 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, 1167 const nfs4_stateid *arg_stateid, 1168 const struct pnfs_layout_range *range, 1169 const nfs4_stateid *stateid) 1170 { 1171 struct inode *inode = lo->plh_inode; 1172 LIST_HEAD(freeme); 1173 1174 spin_lock(&inode->i_lock); 1175 if (!pnfs_layout_is_valid(lo) || 1176 !nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) 1177 goto out_unlock; 1178 if (stateid) { 1179 u32 seq = be32_to_cpu(arg_stateid->seqid); 1180 1181 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq); 1182 pnfs_free_returned_lsegs(lo, &freeme, range, seq); 1183 pnfs_set_layout_stateid(lo, stateid, NULL, true); 1184 } else 1185 pnfs_mark_layout_stateid_invalid(lo, &freeme); 1186 out_unlock: 1187 pnfs_clear_layoutreturn_waitbit(lo); 1188 spin_unlock(&inode->i_lock); 1189 pnfs_free_lseg_list(&freeme); 1190 1191 } 1192 1193 static bool 1194 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo, 1195 nfs4_stateid *stateid, 1196 const struct cred **cred, 1197 enum pnfs_iomode *iomode) 1198 { 1199 /* Serialise LAYOUTGET/LAYOUTRETURN */ 1200 if (atomic_read(&lo->plh_outstanding) != 0) 1201 return false; 1202 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 1203 return false; 1204 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 1205 pnfs_get_layout_hdr(lo); 1206 nfs4_stateid_copy(stateid, &lo->plh_stateid); 1207 *cred = get_cred(lo->plh_lc_cred); 1208 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) { 1209 if (lo->plh_return_seq != 0) 1210 stateid->seqid = cpu_to_be32(lo->plh_return_seq); 1211 if (iomode != NULL) 1212 *iomode = lo->plh_return_iomode; 1213 pnfs_clear_layoutreturn_info(lo); 1214 } else if (iomode != NULL) 1215 *iomode = IOMODE_ANY; 1216 pnfs_barrier_update(lo, be32_to_cpu(stateid->seqid)); 1217 return true; 1218 } 1219 1220 static void 1221 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args, 1222 struct pnfs_layout_hdr *lo, 1223 const nfs4_stateid *stateid, 1224 enum pnfs_iomode iomode) 1225 { 1226 struct inode *inode = lo->plh_inode; 1227 1228 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id; 1229 args->inode = inode; 1230 args->range.iomode = iomode; 1231 args->range.offset = 0; 1232 args->range.length = NFS4_MAX_UINT64; 1233 args->layout = lo; 1234 nfs4_stateid_copy(&args->stateid, stateid); 1235 } 1236 1237 static int 1238 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, 1239 const nfs4_stateid *stateid, 1240 const struct cred **pcred, 1241 enum pnfs_iomode iomode, 1242 bool sync) 1243 { 1244 struct inode *ino = lo->plh_inode; 1245 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1246 struct nfs4_layoutreturn *lrp; 1247 const struct cred *cred = *pcred; 1248 int status = 0; 1249 1250 *pcred = NULL; 1251 lrp = kzalloc(sizeof(*lrp), nfs_io_gfp_mask()); 1252 if (unlikely(lrp == NULL)) { 1253 status = -ENOMEM; 1254 spin_lock(&ino->i_lock); 1255 pnfs_clear_layoutreturn_waitbit(lo); 1256 spin_unlock(&ino->i_lock); 1257 put_cred(cred); 1258 pnfs_put_layout_hdr(lo); 1259 goto out; 1260 } 1261 1262 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode); 1263 lrp->args.ld_private = &lrp->ld_private; 1264 lrp->clp = NFS_SERVER(ino)->nfs_client; 1265 lrp->cred = cred; 1266 if (ld->prepare_layoutreturn) 1267 ld->prepare_layoutreturn(&lrp->args); 1268 1269 status = nfs4_proc_layoutreturn(lrp, sync); 1270 out: 1271 dprintk("<-- %s status: %d\n", __func__, status); 1272 return status; 1273 } 1274 1275 static bool 1276 pnfs_layout_segments_returnable(struct pnfs_layout_hdr *lo, 1277 enum pnfs_iomode iomode, 1278 u32 seq) 1279 { 1280 struct pnfs_layout_range recall_range = { 1281 .length = NFS4_MAX_UINT64, 1282 .iomode = iomode, 1283 }; 1284 return pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, 1285 &recall_range, seq) != -EBUSY; 1286 } 1287 1288 /* Return true if layoutreturn is needed */ 1289 static bool 1290 pnfs_layout_need_return(struct pnfs_layout_hdr *lo) 1291 { 1292 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1293 return false; 1294 return pnfs_layout_segments_returnable(lo, lo->plh_return_iomode, 1295 lo->plh_return_seq); 1296 } 1297 1298 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo) 1299 { 1300 struct inode *inode= lo->plh_inode; 1301 1302 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1303 return; 1304 spin_lock(&inode->i_lock); 1305 if (pnfs_layout_need_return(lo)) { 1306 const struct cred *cred; 1307 nfs4_stateid stateid; 1308 enum pnfs_iomode iomode; 1309 bool send; 1310 1311 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); 1312 spin_unlock(&inode->i_lock); 1313 if (send) { 1314 /* Send an async layoutreturn so we dont deadlock */ 1315 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false); 1316 } 1317 } else 1318 spin_unlock(&inode->i_lock); 1319 } 1320 1321 /* 1322 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr 1323 * when the layout segment list is empty. 1324 * 1325 * Note that a pnfs_layout_hdr can exist with an empty layout segment 1326 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the 1327 * deviceid is marked invalid. 1328 */ 1329 int 1330 _pnfs_return_layout(struct inode *ino) 1331 { 1332 struct pnfs_layout_hdr *lo = NULL; 1333 struct nfs_inode *nfsi = NFS_I(ino); 1334 struct pnfs_layout_range range = { 1335 .iomode = IOMODE_ANY, 1336 .offset = 0, 1337 .length = NFS4_MAX_UINT64, 1338 }; 1339 LIST_HEAD(tmp_list); 1340 const struct cred *cred; 1341 nfs4_stateid stateid; 1342 int status = 0; 1343 bool send, valid_layout; 1344 1345 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); 1346 1347 spin_lock(&ino->i_lock); 1348 lo = nfsi->layout; 1349 if (!lo) { 1350 spin_unlock(&ino->i_lock); 1351 dprintk("NFS: %s no layout to return\n", __func__); 1352 goto out; 1353 } 1354 /* Reference matched in nfs4_layoutreturn_release */ 1355 pnfs_get_layout_hdr(lo); 1356 /* Is there an outstanding layoutreturn ? */ 1357 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1358 spin_unlock(&ino->i_lock); 1359 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1360 TASK_UNINTERRUPTIBLE)) 1361 goto out_put_layout_hdr; 1362 spin_lock(&ino->i_lock); 1363 } 1364 valid_layout = pnfs_layout_is_valid(lo); 1365 pnfs_clear_layoutcommit(ino, &tmp_list); 1366 pnfs_mark_matching_lsegs_return(lo, &tmp_list, &range, 0); 1367 1368 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) 1369 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); 1370 1371 /* Don't send a LAYOUTRETURN if list was initially empty */ 1372 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) || 1373 !valid_layout) { 1374 spin_unlock(&ino->i_lock); 1375 dprintk("NFS: %s no layout segments to return\n", __func__); 1376 goto out_wait_layoutreturn; 1377 } 1378 1379 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL); 1380 spin_unlock(&ino->i_lock); 1381 if (send) 1382 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, true); 1383 out_wait_layoutreturn: 1384 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE); 1385 out_put_layout_hdr: 1386 pnfs_free_lseg_list(&tmp_list); 1387 pnfs_put_layout_hdr(lo); 1388 out: 1389 dprintk("<-- %s status: %d\n", __func__, status); 1390 return status; 1391 } 1392 1393 int 1394 pnfs_commit_and_return_layout(struct inode *inode) 1395 { 1396 struct pnfs_layout_hdr *lo; 1397 int ret; 1398 1399 spin_lock(&inode->i_lock); 1400 lo = NFS_I(inode)->layout; 1401 if (lo == NULL) { 1402 spin_unlock(&inode->i_lock); 1403 return 0; 1404 } 1405 pnfs_get_layout_hdr(lo); 1406 /* Block new layoutgets and read/write to ds */ 1407 lo->plh_block_lgets++; 1408 spin_unlock(&inode->i_lock); 1409 filemap_fdatawait(inode->i_mapping); 1410 ret = pnfs_layoutcommit_inode(inode, true); 1411 if (ret == 0) 1412 ret = _pnfs_return_layout(inode); 1413 spin_lock(&inode->i_lock); 1414 lo->plh_block_lgets--; 1415 spin_unlock(&inode->i_lock); 1416 pnfs_put_layout_hdr(lo); 1417 return ret; 1418 } 1419 1420 bool pnfs_roc(struct inode *ino, 1421 struct nfs4_layoutreturn_args *args, 1422 struct nfs4_layoutreturn_res *res, 1423 const struct cred *cred) 1424 { 1425 struct nfs_inode *nfsi = NFS_I(ino); 1426 struct nfs_open_context *ctx; 1427 struct nfs4_state *state; 1428 struct pnfs_layout_hdr *lo; 1429 struct pnfs_layout_segment *lseg, *next; 1430 const struct cred *lc_cred; 1431 nfs4_stateid stateid; 1432 enum pnfs_iomode iomode = 0; 1433 bool layoutreturn = false, roc = false; 1434 bool skip_read = false; 1435 1436 if (!nfs_have_layout(ino)) 1437 return false; 1438 retry: 1439 rcu_read_lock(); 1440 spin_lock(&ino->i_lock); 1441 lo = nfsi->layout; 1442 if (!lo || !pnfs_layout_is_valid(lo) || 1443 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1444 lo = NULL; 1445 goto out_noroc; 1446 } 1447 pnfs_get_layout_hdr(lo); 1448 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1449 spin_unlock(&ino->i_lock); 1450 rcu_read_unlock(); 1451 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1452 TASK_UNINTERRUPTIBLE); 1453 pnfs_put_layout_hdr(lo); 1454 goto retry; 1455 } 1456 1457 /* no roc if we hold a delegation */ 1458 if (nfs4_check_delegation(ino, FMODE_READ)) { 1459 if (nfs4_check_delegation(ino, FMODE_WRITE)) 1460 goto out_noroc; 1461 skip_read = true; 1462 } 1463 1464 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 1465 state = ctx->state; 1466 if (state == NULL) 1467 continue; 1468 /* Don't return layout if there is open file state */ 1469 if (state->state & FMODE_WRITE) 1470 goto out_noroc; 1471 if (state->state & FMODE_READ) 1472 skip_read = true; 1473 } 1474 1475 1476 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) { 1477 if (skip_read && lseg->pls_range.iomode == IOMODE_READ) 1478 continue; 1479 /* If we are sending layoutreturn, invalidate all valid lsegs */ 1480 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags)) 1481 continue; 1482 /* 1483 * Note: mark lseg for return so pnfs_layout_remove_lseg 1484 * doesn't invalidate the layout for us. 1485 */ 1486 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 1487 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs)) 1488 continue; 1489 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 1490 } 1491 1492 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1493 goto out_noroc; 1494 1495 /* ROC in two conditions: 1496 * 1. there are ROC lsegs 1497 * 2. we don't send layoutreturn 1498 */ 1499 /* lo ref dropped in pnfs_roc_release() */ 1500 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode); 1501 /* If the creds don't match, we can't compound the layoutreturn */ 1502 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0) 1503 goto out_noroc; 1504 1505 roc = layoutreturn; 1506 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode); 1507 res->lrs_present = 0; 1508 layoutreturn = false; 1509 put_cred(lc_cred); 1510 1511 out_noroc: 1512 spin_unlock(&ino->i_lock); 1513 rcu_read_unlock(); 1514 pnfs_layoutcommit_inode(ino, true); 1515 if (roc) { 1516 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1517 if (ld->prepare_layoutreturn) 1518 ld->prepare_layoutreturn(args); 1519 pnfs_put_layout_hdr(lo); 1520 return true; 1521 } 1522 if (layoutreturn) 1523 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, true); 1524 pnfs_put_layout_hdr(lo); 1525 return false; 1526 } 1527 1528 int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp, 1529 struct nfs4_layoutreturn_res **respp, int *ret) 1530 { 1531 struct nfs4_layoutreturn_args *arg = *argpp; 1532 int retval = -EAGAIN; 1533 1534 if (!arg) 1535 return 0; 1536 /* Handle Layoutreturn errors */ 1537 switch (*ret) { 1538 case 0: 1539 retval = 0; 1540 break; 1541 case -NFS4ERR_NOMATCHING_LAYOUT: 1542 /* Was there an RPC level error? If not, retry */ 1543 if (task->tk_rpc_status == 0) 1544 break; 1545 /* If the call was not sent, let caller handle it */ 1546 if (!RPC_WAS_SENT(task)) 1547 return 0; 1548 /* 1549 * Otherwise, assume the call succeeded and 1550 * that we need to release the layout 1551 */ 1552 *ret = 0; 1553 (*respp)->lrs_present = 0; 1554 retval = 0; 1555 break; 1556 case -NFS4ERR_DELAY: 1557 /* Let the caller handle the retry */ 1558 *ret = -NFS4ERR_NOMATCHING_LAYOUT; 1559 return 0; 1560 case -NFS4ERR_OLD_STATEID: 1561 if (!nfs4_layout_refresh_old_stateid(&arg->stateid, 1562 &arg->range, arg->inode)) 1563 break; 1564 *ret = -NFS4ERR_NOMATCHING_LAYOUT; 1565 return -EAGAIN; 1566 } 1567 *argpp = NULL; 1568 *respp = NULL; 1569 return retval; 1570 } 1571 1572 void pnfs_roc_release(struct nfs4_layoutreturn_args *args, 1573 struct nfs4_layoutreturn_res *res, 1574 int ret) 1575 { 1576 struct pnfs_layout_hdr *lo = args->layout; 1577 struct inode *inode = args->inode; 1578 const nfs4_stateid *res_stateid = NULL; 1579 struct nfs4_xdr_opaque_data *ld_private = args->ld_private; 1580 1581 switch (ret) { 1582 case -NFS4ERR_NOMATCHING_LAYOUT: 1583 spin_lock(&inode->i_lock); 1584 if (pnfs_layout_is_valid(lo) && 1585 nfs4_stateid_match_other(&args->stateid, &lo->plh_stateid)) 1586 pnfs_set_plh_return_info(lo, args->range.iomode, 0); 1587 pnfs_clear_layoutreturn_waitbit(lo); 1588 spin_unlock(&inode->i_lock); 1589 break; 1590 case 0: 1591 if (res->lrs_present) 1592 res_stateid = &res->stateid; 1593 fallthrough; 1594 default: 1595 pnfs_layoutreturn_free_lsegs(lo, &args->stateid, &args->range, 1596 res_stateid); 1597 } 1598 trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret); 1599 if (ld_private && ld_private->ops && ld_private->ops->free) 1600 ld_private->ops->free(ld_private); 1601 pnfs_put_layout_hdr(lo); 1602 } 1603 1604 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) 1605 { 1606 struct nfs_inode *nfsi = NFS_I(ino); 1607 struct pnfs_layout_hdr *lo; 1608 bool sleep = false; 1609 1610 /* we might not have grabbed lo reference. so need to check under 1611 * i_lock */ 1612 spin_lock(&ino->i_lock); 1613 lo = nfsi->layout; 1614 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1615 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1616 sleep = true; 1617 } 1618 spin_unlock(&ino->i_lock); 1619 return sleep; 1620 } 1621 1622 /* 1623 * Compare two layout segments for sorting into layout cache. 1624 * We want to preferentially return RW over RO layouts, so ensure those 1625 * are seen first. 1626 */ 1627 static s64 1628 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, 1629 const struct pnfs_layout_range *l2) 1630 { 1631 s64 d; 1632 1633 /* high offset > low offset */ 1634 d = l1->offset - l2->offset; 1635 if (d) 1636 return d; 1637 1638 /* short length > long length */ 1639 d = l2->length - l1->length; 1640 if (d) 1641 return d; 1642 1643 /* read > read/write */ 1644 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); 1645 } 1646 1647 static bool 1648 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1, 1649 const struct pnfs_layout_range *l2) 1650 { 1651 return pnfs_lseg_range_cmp(l1, l2) > 0; 1652 } 1653 1654 static bool 1655 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg, 1656 struct pnfs_layout_segment *old) 1657 { 1658 return false; 1659 } 1660 1661 void 1662 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1663 struct pnfs_layout_segment *lseg, 1664 bool (*is_after)(const struct pnfs_layout_range *, 1665 const struct pnfs_layout_range *), 1666 bool (*do_merge)(struct pnfs_layout_segment *, 1667 struct pnfs_layout_segment *), 1668 struct list_head *free_me) 1669 { 1670 struct pnfs_layout_segment *lp, *tmp; 1671 1672 dprintk("%s:Begin\n", __func__); 1673 1674 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) { 1675 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0) 1676 continue; 1677 if (do_merge(lseg, lp)) { 1678 mark_lseg_invalid(lp, free_me); 1679 continue; 1680 } 1681 if (is_after(&lseg->pls_range, &lp->pls_range)) 1682 continue; 1683 list_add_tail(&lseg->pls_list, &lp->pls_list); 1684 dprintk("%s: inserted lseg %p " 1685 "iomode %d offset %llu length %llu before " 1686 "lp %p iomode %d offset %llu length %llu\n", 1687 __func__, lseg, lseg->pls_range.iomode, 1688 lseg->pls_range.offset, lseg->pls_range.length, 1689 lp, lp->pls_range.iomode, lp->pls_range.offset, 1690 lp->pls_range.length); 1691 goto out; 1692 } 1693 list_add_tail(&lseg->pls_list, &lo->plh_segs); 1694 dprintk("%s: inserted lseg %p " 1695 "iomode %d offset %llu length %llu at tail\n", 1696 __func__, lseg, lseg->pls_range.iomode, 1697 lseg->pls_range.offset, lseg->pls_range.length); 1698 out: 1699 pnfs_get_layout_hdr(lo); 1700 1701 dprintk("%s:Return\n", __func__); 1702 } 1703 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg); 1704 1705 static void 1706 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1707 struct pnfs_layout_segment *lseg, 1708 struct list_head *free_me) 1709 { 1710 struct inode *inode = lo->plh_inode; 1711 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 1712 1713 if (ld->add_lseg != NULL) 1714 ld->add_lseg(lo, lseg, free_me); 1715 else 1716 pnfs_generic_layout_insert_lseg(lo, lseg, 1717 pnfs_lseg_range_is_after, 1718 pnfs_lseg_no_merge, 1719 free_me); 1720 } 1721 1722 static struct pnfs_layout_hdr * 1723 alloc_init_layout_hdr(struct inode *ino, 1724 struct nfs_open_context *ctx, 1725 gfp_t gfp_flags) 1726 { 1727 struct pnfs_layout_hdr *lo; 1728 1729 lo = pnfs_alloc_layout_hdr(ino, gfp_flags); 1730 if (!lo) 1731 return NULL; 1732 refcount_set(&lo->plh_refcount, 1); 1733 INIT_LIST_HEAD(&lo->plh_layouts); 1734 INIT_LIST_HEAD(&lo->plh_segs); 1735 INIT_LIST_HEAD(&lo->plh_return_segs); 1736 INIT_LIST_HEAD(&lo->plh_bulk_destroy); 1737 lo->plh_inode = ino; 1738 lo->plh_lc_cred = get_cred(ctx->cred); 1739 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID; 1740 return lo; 1741 } 1742 1743 static struct pnfs_layout_hdr * 1744 pnfs_find_alloc_layout(struct inode *ino, 1745 struct nfs_open_context *ctx, 1746 gfp_t gfp_flags) 1747 __releases(&ino->i_lock) 1748 __acquires(&ino->i_lock) 1749 { 1750 struct nfs_inode *nfsi = NFS_I(ino); 1751 struct pnfs_layout_hdr *new = NULL; 1752 1753 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); 1754 1755 if (nfsi->layout != NULL) 1756 goto out_existing; 1757 spin_unlock(&ino->i_lock); 1758 new = alloc_init_layout_hdr(ino, ctx, gfp_flags); 1759 spin_lock(&ino->i_lock); 1760 1761 if (likely(nfsi->layout == NULL)) { /* Won the race? */ 1762 nfsi->layout = new; 1763 return new; 1764 } else if (new != NULL) 1765 pnfs_free_layout_hdr(new); 1766 out_existing: 1767 pnfs_get_layout_hdr(nfsi->layout); 1768 return nfsi->layout; 1769 } 1770 1771 /* 1772 * iomode matching rules: 1773 * iomode lseg strict match 1774 * iomode 1775 * ----- ----- ------ ----- 1776 * ANY READ N/A true 1777 * ANY RW N/A true 1778 * RW READ N/A false 1779 * RW RW N/A true 1780 * READ READ N/A true 1781 * READ RW true false 1782 * READ RW false true 1783 */ 1784 static bool 1785 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, 1786 const struct pnfs_layout_range *range, 1787 bool strict_iomode) 1788 { 1789 struct pnfs_layout_range range1; 1790 1791 if ((range->iomode == IOMODE_RW && 1792 ls_range->iomode != IOMODE_RW) || 1793 (range->iomode != ls_range->iomode && 1794 strict_iomode) || 1795 !pnfs_lseg_range_intersecting(ls_range, range)) 1796 return false; 1797 1798 /* range1 covers only the first byte in the range */ 1799 range1 = *range; 1800 range1.length = 1; 1801 return pnfs_lseg_range_contained(ls_range, &range1); 1802 } 1803 1804 /* 1805 * lookup range in layout 1806 */ 1807 static struct pnfs_layout_segment * 1808 pnfs_find_lseg(struct pnfs_layout_hdr *lo, 1809 struct pnfs_layout_range *range, 1810 bool strict_iomode) 1811 { 1812 struct pnfs_layout_segment *lseg, *ret = NULL; 1813 1814 dprintk("%s:Begin\n", __func__); 1815 1816 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 1817 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && 1818 pnfs_lseg_range_match(&lseg->pls_range, range, 1819 strict_iomode)) { 1820 ret = pnfs_get_lseg(lseg); 1821 break; 1822 } 1823 } 1824 1825 dprintk("%s:Return lseg %p ref %d\n", 1826 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0); 1827 return ret; 1828 } 1829 1830 /* 1831 * Use mdsthreshold hints set at each OPEN to determine if I/O should go 1832 * to the MDS or over pNFS 1833 * 1834 * The nfs_inode read_io and write_io fields are cumulative counters reset 1835 * when there are no layout segments. Note that in pnfs_update_layout iomode 1836 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a 1837 * WRITE request. 1838 * 1839 * A return of true means use MDS I/O. 1840 * 1841 * From rfc 5661: 1842 * If a file's size is smaller than the file size threshold, data accesses 1843 * SHOULD be sent to the metadata server. If an I/O request has a length that 1844 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata 1845 * server. If both file size and I/O size are provided, the client SHOULD 1846 * reach or exceed both thresholds before sending its read or write 1847 * requests to the data server. 1848 */ 1849 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, 1850 struct inode *ino, int iomode) 1851 { 1852 struct nfs4_threshold *t = ctx->mdsthreshold; 1853 struct nfs_inode *nfsi = NFS_I(ino); 1854 loff_t fsize = i_size_read(ino); 1855 bool size = false, size_set = false, io = false, io_set = false, ret = false; 1856 1857 if (t == NULL) 1858 return ret; 1859 1860 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", 1861 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); 1862 1863 switch (iomode) { 1864 case IOMODE_READ: 1865 if (t->bm & THRESHOLD_RD) { 1866 dprintk("%s fsize %llu\n", __func__, fsize); 1867 size_set = true; 1868 if (fsize < t->rd_sz) 1869 size = true; 1870 } 1871 if (t->bm & THRESHOLD_RD_IO) { 1872 dprintk("%s nfsi->read_io %llu\n", __func__, 1873 nfsi->read_io); 1874 io_set = true; 1875 if (nfsi->read_io < t->rd_io_sz) 1876 io = true; 1877 } 1878 break; 1879 case IOMODE_RW: 1880 if (t->bm & THRESHOLD_WR) { 1881 dprintk("%s fsize %llu\n", __func__, fsize); 1882 size_set = true; 1883 if (fsize < t->wr_sz) 1884 size = true; 1885 } 1886 if (t->bm & THRESHOLD_WR_IO) { 1887 dprintk("%s nfsi->write_io %llu\n", __func__, 1888 nfsi->write_io); 1889 io_set = true; 1890 if (nfsi->write_io < t->wr_io_sz) 1891 io = true; 1892 } 1893 break; 1894 } 1895 if (size_set && io_set) { 1896 if (size && io) 1897 ret = true; 1898 } else if (size || io) 1899 ret = true; 1900 1901 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); 1902 return ret; 1903 } 1904 1905 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) 1906 { 1907 /* 1908 * send layoutcommit as it can hold up layoutreturn due to lseg 1909 * reference 1910 */ 1911 pnfs_layoutcommit_inode(lo->plh_inode, false); 1912 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, 1913 nfs_wait_bit_killable, 1914 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 1915 } 1916 1917 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo) 1918 { 1919 atomic_inc(&lo->plh_outstanding); 1920 } 1921 1922 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo) 1923 { 1924 if (atomic_dec_and_test(&lo->plh_outstanding) && 1925 test_and_clear_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags)) 1926 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN); 1927 } 1928 1929 static bool pnfs_is_first_layoutget(struct pnfs_layout_hdr *lo) 1930 { 1931 return test_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags); 1932 } 1933 1934 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) 1935 { 1936 unsigned long *bitlock = &lo->plh_flags; 1937 1938 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); 1939 smp_mb__after_atomic(); 1940 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); 1941 } 1942 1943 static void _add_to_server_list(struct pnfs_layout_hdr *lo, 1944 struct nfs_server *server) 1945 { 1946 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) { 1947 struct nfs_client *clp = server->nfs_client; 1948 1949 /* The lo must be on the clp list if there is any 1950 * chance of a CB_LAYOUTRECALL(FILE) coming in. 1951 */ 1952 spin_lock(&clp->cl_lock); 1953 list_add_tail_rcu(&lo->plh_layouts, &server->layouts); 1954 spin_unlock(&clp->cl_lock); 1955 } 1956 } 1957 1958 /* 1959 * Layout segment is retreived from the server if not cached. 1960 * The appropriate layout segment is referenced and returned to the caller. 1961 */ 1962 struct pnfs_layout_segment * 1963 pnfs_update_layout(struct inode *ino, 1964 struct nfs_open_context *ctx, 1965 loff_t pos, 1966 u64 count, 1967 enum pnfs_iomode iomode, 1968 bool strict_iomode, 1969 gfp_t gfp_flags) 1970 { 1971 struct pnfs_layout_range arg = { 1972 .iomode = iomode, 1973 .offset = pos, 1974 .length = count, 1975 }; 1976 unsigned pg_offset; 1977 struct nfs_server *server = NFS_SERVER(ino); 1978 struct nfs_client *clp = server->nfs_client; 1979 struct pnfs_layout_hdr *lo = NULL; 1980 struct pnfs_layout_segment *lseg = NULL; 1981 struct nfs4_layoutget *lgp; 1982 nfs4_stateid stateid; 1983 struct nfs4_exception exception = { 1984 .inode = ino, 1985 }; 1986 unsigned long giveup = jiffies + (clp->cl_lease_time << 1); 1987 bool first; 1988 1989 if (!pnfs_enabled_sb(NFS_SERVER(ino))) { 1990 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1991 PNFS_UPDATE_LAYOUT_NO_PNFS); 1992 goto out; 1993 } 1994 1995 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) { 1996 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 1997 PNFS_UPDATE_LAYOUT_MDSTHRESH); 1998 goto out; 1999 } 2000 2001 lookup_again: 2002 if (!nfs4_valid_open_stateid(ctx->state)) { 2003 trace_pnfs_update_layout(ino, pos, count, 2004 iomode, lo, lseg, 2005 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 2006 lseg = ERR_PTR(-EIO); 2007 goto out; 2008 } 2009 2010 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp)); 2011 if (IS_ERR(lseg)) 2012 goto out; 2013 first = false; 2014 spin_lock(&ino->i_lock); 2015 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); 2016 if (lo == NULL) { 2017 spin_unlock(&ino->i_lock); 2018 lseg = ERR_PTR(-ENOMEM); 2019 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2020 PNFS_UPDATE_LAYOUT_NOMEM); 2021 goto out; 2022 } 2023 2024 /* Do we even need to bother with this? */ 2025 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 2026 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2027 PNFS_UPDATE_LAYOUT_BULK_RECALL); 2028 dprintk("%s matches recall, use MDS\n", __func__); 2029 goto out_unlock; 2030 } 2031 2032 /* if LAYOUTGET already failed once we don't try again */ 2033 if (pnfs_layout_io_test_failed(lo, iomode)) { 2034 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2035 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); 2036 goto out_unlock; 2037 } 2038 2039 /* 2040 * If the layout segment list is empty, but there are outstanding 2041 * layoutget calls, then they might be subject to a layoutrecall. 2042 */ 2043 if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) && 2044 atomic_read(&lo->plh_outstanding) != 0) { 2045 spin_unlock(&ino->i_lock); 2046 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN, 2047 TASK_KILLABLE)); 2048 if (IS_ERR(lseg)) 2049 goto out_put_layout_hdr; 2050 pnfs_put_layout_hdr(lo); 2051 goto lookup_again; 2052 } 2053 2054 /* 2055 * Because we free lsegs when sending LAYOUTRETURN, we need to wait 2056 * for LAYOUTRETURN. 2057 */ 2058 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 2059 spin_unlock(&ino->i_lock); 2060 dprintk("%s wait for layoutreturn\n", __func__); 2061 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo)); 2062 if (!IS_ERR(lseg)) { 2063 pnfs_put_layout_hdr(lo); 2064 dprintk("%s retrying\n", __func__); 2065 trace_pnfs_update_layout(ino, pos, count, iomode, lo, 2066 lseg, 2067 PNFS_UPDATE_LAYOUT_RETRY); 2068 goto lookup_again; 2069 } 2070 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2071 PNFS_UPDATE_LAYOUT_RETURN); 2072 goto out_put_layout_hdr; 2073 } 2074 2075 lseg = pnfs_find_lseg(lo, &arg, strict_iomode); 2076 if (lseg) { 2077 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2078 PNFS_UPDATE_LAYOUT_FOUND_CACHED); 2079 goto out_unlock; 2080 } 2081 2082 /* 2083 * Choose a stateid for the LAYOUTGET. If we don't have a layout 2084 * stateid, or it has been invalidated, then we must use the open 2085 * stateid. 2086 */ 2087 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { 2088 int status; 2089 2090 /* 2091 * The first layoutget for the file. Need to serialize per 2092 * RFC 5661 Errata 3208. 2093 */ 2094 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, 2095 &lo->plh_flags)) { 2096 spin_unlock(&ino->i_lock); 2097 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, 2098 NFS_LAYOUT_FIRST_LAYOUTGET, 2099 TASK_KILLABLE)); 2100 if (IS_ERR(lseg)) 2101 goto out_put_layout_hdr; 2102 pnfs_put_layout_hdr(lo); 2103 dprintk("%s retrying\n", __func__); 2104 goto lookup_again; 2105 } 2106 2107 spin_unlock(&ino->i_lock); 2108 first = true; 2109 status = nfs4_select_rw_stateid(ctx->state, 2110 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ, 2111 NULL, &stateid, NULL); 2112 if (status != 0) { 2113 lseg = ERR_PTR(status); 2114 trace_pnfs_update_layout(ino, pos, count, 2115 iomode, lo, lseg, 2116 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 2117 nfs4_schedule_stateid_recovery(server, ctx->state); 2118 pnfs_clear_first_layoutget(lo); 2119 pnfs_put_layout_hdr(lo); 2120 goto lookup_again; 2121 } 2122 spin_lock(&ino->i_lock); 2123 } else { 2124 nfs4_stateid_copy(&stateid, &lo->plh_stateid); 2125 } 2126 2127 if (pnfs_layoutgets_blocked(lo)) { 2128 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2129 PNFS_UPDATE_LAYOUT_BLOCKED); 2130 goto out_unlock; 2131 } 2132 nfs_layoutget_begin(lo); 2133 spin_unlock(&ino->i_lock); 2134 2135 _add_to_server_list(lo, server); 2136 2137 pg_offset = arg.offset & ~PAGE_MASK; 2138 if (pg_offset) { 2139 arg.offset -= pg_offset; 2140 arg.length += pg_offset; 2141 } 2142 if (arg.length != NFS4_MAX_UINT64) 2143 arg.length = PAGE_ALIGN(arg.length); 2144 2145 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags); 2146 if (!lgp) { 2147 lseg = ERR_PTR(-ENOMEM); 2148 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL, 2149 PNFS_UPDATE_LAYOUT_NOMEM); 2150 nfs_layoutget_end(lo); 2151 goto out_put_layout_hdr; 2152 } 2153 2154 lgp->lo = lo; 2155 pnfs_get_layout_hdr(lo); 2156 2157 lseg = nfs4_proc_layoutget(lgp, &exception); 2158 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2159 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); 2160 nfs_layoutget_end(lo); 2161 if (IS_ERR(lseg)) { 2162 switch(PTR_ERR(lseg)) { 2163 case -EBUSY: 2164 if (time_after(jiffies, giveup)) 2165 lseg = NULL; 2166 break; 2167 case -ERECALLCONFLICT: 2168 case -EAGAIN: 2169 break; 2170 case -ENODATA: 2171 /* The server returned NFS4ERR_LAYOUTUNAVAILABLE */ 2172 pnfs_layout_set_fail_bit( 2173 lo, pnfs_iomode_to_fail_bit(iomode)); 2174 lseg = NULL; 2175 goto out_put_layout_hdr; 2176 default: 2177 if (!nfs_error_is_fatal(PTR_ERR(lseg))) { 2178 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2179 lseg = NULL; 2180 } 2181 goto out_put_layout_hdr; 2182 } 2183 if (lseg) { 2184 if (!exception.retry) 2185 goto out_put_layout_hdr; 2186 if (first) 2187 pnfs_clear_first_layoutget(lo); 2188 trace_pnfs_update_layout(ino, pos, count, 2189 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); 2190 pnfs_put_layout_hdr(lo); 2191 goto lookup_again; 2192 } 2193 } else { 2194 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2195 } 2196 2197 out_put_layout_hdr: 2198 if (first) 2199 pnfs_clear_first_layoutget(lo); 2200 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2201 PNFS_UPDATE_LAYOUT_EXIT); 2202 pnfs_put_layout_hdr(lo); 2203 out: 2204 dprintk("%s: inode %s/%llu pNFS layout segment %s for " 2205 "(%s, offset: %llu, length: %llu)\n", 2206 __func__, ino->i_sb->s_id, 2207 (unsigned long long)NFS_FILEID(ino), 2208 IS_ERR_OR_NULL(lseg) ? "not found" : "found", 2209 iomode==IOMODE_RW ? "read/write" : "read-only", 2210 (unsigned long long)pos, 2211 (unsigned long long)count); 2212 return lseg; 2213 out_unlock: 2214 spin_unlock(&ino->i_lock); 2215 goto out_put_layout_hdr; 2216 } 2217 EXPORT_SYMBOL_GPL(pnfs_update_layout); 2218 2219 static bool 2220 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) 2221 { 2222 switch (range->iomode) { 2223 case IOMODE_READ: 2224 case IOMODE_RW: 2225 break; 2226 default: 2227 return false; 2228 } 2229 if (range->offset == NFS4_MAX_UINT64) 2230 return false; 2231 if (range->length == 0) 2232 return false; 2233 if (range->length != NFS4_MAX_UINT64 && 2234 range->length > NFS4_MAX_UINT64 - range->offset) 2235 return false; 2236 return true; 2237 } 2238 2239 static struct pnfs_layout_hdr * 2240 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx) 2241 { 2242 struct pnfs_layout_hdr *lo; 2243 2244 spin_lock(&ino->i_lock); 2245 lo = pnfs_find_alloc_layout(ino, ctx, nfs_io_gfp_mask()); 2246 if (!lo) 2247 goto out_unlock; 2248 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) 2249 goto out_unlock; 2250 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) 2251 goto out_unlock; 2252 if (pnfs_layoutgets_blocked(lo)) 2253 goto out_unlock; 2254 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) 2255 goto out_unlock; 2256 nfs_layoutget_begin(lo); 2257 spin_unlock(&ino->i_lock); 2258 _add_to_server_list(lo, NFS_SERVER(ino)); 2259 return lo; 2260 2261 out_unlock: 2262 spin_unlock(&ino->i_lock); 2263 pnfs_put_layout_hdr(lo); 2264 return NULL; 2265 } 2266 2267 static void _lgopen_prepare_attached(struct nfs4_opendata *data, 2268 struct nfs_open_context *ctx) 2269 { 2270 struct inode *ino = data->dentry->d_inode; 2271 struct pnfs_layout_range rng = { 2272 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2273 IOMODE_RW: IOMODE_READ, 2274 .offset = 0, 2275 .length = NFS4_MAX_UINT64, 2276 }; 2277 struct nfs4_layoutget *lgp; 2278 struct pnfs_layout_hdr *lo; 2279 2280 /* Heuristic: don't send layoutget if we have cached data */ 2281 if (rng.iomode == IOMODE_READ && 2282 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0)) 2283 return; 2284 2285 lo = _pnfs_grab_empty_layout(ino, ctx); 2286 if (!lo) 2287 return; 2288 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, &rng, 2289 nfs_io_gfp_mask()); 2290 if (!lgp) { 2291 pnfs_clear_first_layoutget(lo); 2292 nfs_layoutget_end(lo); 2293 pnfs_put_layout_hdr(lo); 2294 return; 2295 } 2296 lgp->lo = lo; 2297 data->lgp = lgp; 2298 data->o_arg.lg_args = &lgp->args; 2299 data->o_res.lg_res = &lgp->res; 2300 } 2301 2302 static void _lgopen_prepare_floating(struct nfs4_opendata *data, 2303 struct nfs_open_context *ctx) 2304 { 2305 struct inode *ino = data->dentry->d_inode; 2306 struct pnfs_layout_range rng = { 2307 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2308 IOMODE_RW: IOMODE_READ, 2309 .offset = 0, 2310 .length = NFS4_MAX_UINT64, 2311 }; 2312 struct nfs4_layoutget *lgp; 2313 2314 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, &rng, 2315 nfs_io_gfp_mask()); 2316 if (!lgp) 2317 return; 2318 data->lgp = lgp; 2319 data->o_arg.lg_args = &lgp->args; 2320 data->o_res.lg_res = &lgp->res; 2321 } 2322 2323 void pnfs_lgopen_prepare(struct nfs4_opendata *data, 2324 struct nfs_open_context *ctx) 2325 { 2326 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 2327 2328 if (!(pnfs_enabled_sb(server) && 2329 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN)) 2330 return; 2331 /* Could check on max_ops, but currently hardcoded high enough */ 2332 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN)) 2333 return; 2334 if (data->lgp) 2335 return; 2336 if (data->state) 2337 _lgopen_prepare_attached(data, ctx); 2338 else 2339 _lgopen_prepare_floating(data, ctx); 2340 } 2341 2342 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp, 2343 struct nfs_open_context *ctx) 2344 { 2345 struct pnfs_layout_hdr *lo; 2346 struct pnfs_layout_segment *lseg; 2347 struct nfs_server *srv = NFS_SERVER(ino); 2348 u32 iomode; 2349 2350 if (!lgp) 2351 return; 2352 dprintk("%s: entered with status %i\n", __func__, lgp->res.status); 2353 if (lgp->res.status) { 2354 switch (lgp->res.status) { 2355 default: 2356 break; 2357 /* 2358 * Halt lgopen attempts if the server doesn't recognise 2359 * the "current stateid" value, the layout type, or the 2360 * layoutget operation as being valid. 2361 * Also if it complains about too many ops in the compound 2362 * or of the request/reply being too big. 2363 */ 2364 case -NFS4ERR_BAD_STATEID: 2365 case -NFS4ERR_NOTSUPP: 2366 case -NFS4ERR_REP_TOO_BIG: 2367 case -NFS4ERR_REP_TOO_BIG_TO_CACHE: 2368 case -NFS4ERR_REQ_TOO_BIG: 2369 case -NFS4ERR_TOO_MANY_OPS: 2370 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 2371 srv->caps &= ~NFS_CAP_LGOPEN; 2372 } 2373 return; 2374 } 2375 if (!lgp->lo) { 2376 lo = _pnfs_grab_empty_layout(ino, ctx); 2377 if (!lo) 2378 return; 2379 lgp->lo = lo; 2380 } else 2381 lo = lgp->lo; 2382 2383 lseg = pnfs_layout_process(lgp); 2384 if (!IS_ERR(lseg)) { 2385 iomode = lgp->args.range.iomode; 2386 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2387 pnfs_put_lseg(lseg); 2388 } 2389 } 2390 2391 void nfs4_lgopen_release(struct nfs4_layoutget *lgp) 2392 { 2393 if (lgp != NULL) { 2394 if (lgp->lo) { 2395 pnfs_clear_first_layoutget(lgp->lo); 2396 nfs_layoutget_end(lgp->lo); 2397 } 2398 pnfs_layoutget_free(lgp); 2399 } 2400 } 2401 2402 struct pnfs_layout_segment * 2403 pnfs_layout_process(struct nfs4_layoutget *lgp) 2404 { 2405 struct pnfs_layout_hdr *lo = lgp->lo; 2406 struct nfs4_layoutget_res *res = &lgp->res; 2407 struct pnfs_layout_segment *lseg; 2408 struct inode *ino = lo->plh_inode; 2409 LIST_HEAD(free_me); 2410 2411 if (!pnfs_sanity_check_layout_range(&res->range)) 2412 return ERR_PTR(-EINVAL); 2413 2414 /* Inject layout blob into I/O device driver */ 2415 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); 2416 if (IS_ERR_OR_NULL(lseg)) { 2417 if (!lseg) 2418 lseg = ERR_PTR(-ENOMEM); 2419 2420 dprintk("%s: Could not allocate layout: error %ld\n", 2421 __func__, PTR_ERR(lseg)); 2422 return lseg; 2423 } 2424 2425 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid); 2426 2427 spin_lock(&ino->i_lock); 2428 if (pnfs_layoutgets_blocked(lo)) { 2429 dprintk("%s forget reply due to state\n", __func__); 2430 goto out_forget; 2431 } 2432 2433 if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) && 2434 !pnfs_is_first_layoutget(lo)) 2435 goto out_forget; 2436 2437 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { 2438 /* existing state ID, make sure the sequence number matches. */ 2439 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { 2440 if (!pnfs_layout_is_valid(lo)) 2441 lo->plh_barrier = 0; 2442 dprintk("%s forget reply due to sequence\n", __func__); 2443 goto out_forget; 2444 } 2445 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false); 2446 } else if (pnfs_layout_is_valid(lo)) { 2447 /* 2448 * We got an entirely new state ID. Mark all segments for the 2449 * inode invalid, and retry the layoutget 2450 */ 2451 struct pnfs_layout_range range = { 2452 .iomode = IOMODE_ANY, 2453 .length = NFS4_MAX_UINT64, 2454 }; 2455 pnfs_mark_matching_lsegs_return(lo, &free_me, &range, 0); 2456 goto out_forget; 2457 } else { 2458 /* We have a completely new layout */ 2459 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true); 2460 } 2461 2462 pnfs_get_lseg(lseg); 2463 pnfs_layout_insert_lseg(lo, lseg, &free_me); 2464 2465 2466 if (res->return_on_close) 2467 set_bit(NFS_LSEG_ROC, &lseg->pls_flags); 2468 2469 spin_unlock(&ino->i_lock); 2470 pnfs_free_lseg_list(&free_me); 2471 return lseg; 2472 2473 out_forget: 2474 spin_unlock(&ino->i_lock); 2475 lseg->pls_layout = lo; 2476 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 2477 return ERR_PTR(-EAGAIN); 2478 } 2479 2480 /** 2481 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments 2482 * @lo: pointer to layout header 2483 * @tmp_list: list header to be used with pnfs_free_lseg_list() 2484 * @return_range: describe layout segment ranges to be returned 2485 * @seq: stateid seqid to match 2486 * 2487 * This function is mainly intended for use by layoutrecall. It attempts 2488 * to free the layout segment immediately, or else to mark it for return 2489 * as soon as its reference count drops to zero. 2490 * 2491 * Returns 2492 * - 0: a layoutreturn needs to be scheduled. 2493 * - EBUSY: there are layout segment that are still in use. 2494 * - ENOENT: there are no layout segments that need to be returned. 2495 */ 2496 int 2497 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 2498 struct list_head *tmp_list, 2499 const struct pnfs_layout_range *return_range, 2500 u32 seq) 2501 { 2502 struct pnfs_layout_segment *lseg, *next; 2503 struct nfs_server *server = NFS_SERVER(lo->plh_inode); 2504 int remaining = 0; 2505 2506 dprintk("%s:Begin lo %p\n", __func__, lo); 2507 2508 assert_spin_locked(&lo->plh_inode->i_lock); 2509 2510 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 2511 tmp_list = &lo->plh_return_segs; 2512 2513 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 2514 if (pnfs_match_lseg_recall(lseg, return_range, seq)) { 2515 dprintk("%s: marking lseg %p iomode %d " 2516 "offset %llu length %llu\n", __func__, 2517 lseg, lseg->pls_range.iomode, 2518 lseg->pls_range.offset, 2519 lseg->pls_range.length); 2520 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 2521 tmp_list = &lo->plh_return_segs; 2522 if (mark_lseg_invalid(lseg, tmp_list)) 2523 continue; 2524 remaining++; 2525 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 2526 pnfs_lseg_cancel_io(server, lseg); 2527 } 2528 2529 if (remaining) { 2530 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2531 return -EBUSY; 2532 } 2533 2534 if (!list_empty(&lo->plh_return_segs)) { 2535 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2536 return 0; 2537 } 2538 2539 return -ENOENT; 2540 } 2541 2542 static void 2543 pnfs_mark_layout_for_return(struct inode *inode, 2544 const struct pnfs_layout_range *range) 2545 { 2546 struct pnfs_layout_hdr *lo; 2547 bool return_now = false; 2548 2549 spin_lock(&inode->i_lock); 2550 lo = NFS_I(inode)->layout; 2551 if (!pnfs_layout_is_valid(lo)) { 2552 spin_unlock(&inode->i_lock); 2553 return; 2554 } 2555 pnfs_set_plh_return_info(lo, range->iomode, 0); 2556 /* 2557 * mark all matching lsegs so that we are sure to have no live 2558 * segments at hand when sending layoutreturn. See pnfs_put_lseg() 2559 * for how it works. 2560 */ 2561 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) { 2562 const struct cred *cred; 2563 nfs4_stateid stateid; 2564 enum pnfs_iomode iomode; 2565 2566 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); 2567 spin_unlock(&inode->i_lock); 2568 if (return_now) 2569 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false); 2570 } else { 2571 spin_unlock(&inode->i_lock); 2572 nfs_commit_inode(inode, 0); 2573 } 2574 } 2575 2576 void pnfs_error_mark_layout_for_return(struct inode *inode, 2577 struct pnfs_layout_segment *lseg) 2578 { 2579 struct pnfs_layout_range range = { 2580 .iomode = lseg->pls_range.iomode, 2581 .offset = 0, 2582 .length = NFS4_MAX_UINT64, 2583 }; 2584 2585 pnfs_mark_layout_for_return(inode, &range); 2586 } 2587 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); 2588 2589 static bool 2590 pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo) 2591 { 2592 return pnfs_layout_is_valid(lo) && 2593 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) && 2594 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 2595 } 2596 2597 static struct pnfs_layout_segment * 2598 pnfs_find_first_lseg(struct pnfs_layout_hdr *lo, 2599 const struct pnfs_layout_range *range, 2600 enum pnfs_iomode iomode) 2601 { 2602 struct pnfs_layout_segment *lseg; 2603 2604 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 2605 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) 2606 continue; 2607 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 2608 continue; 2609 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY) 2610 continue; 2611 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range)) 2612 return lseg; 2613 } 2614 return NULL; 2615 } 2616 2617 /* Find open file states whose mode matches that of the range */ 2618 static bool 2619 pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo, 2620 const struct pnfs_layout_range *range) 2621 { 2622 struct list_head *head; 2623 struct nfs_open_context *ctx; 2624 fmode_t mode = 0; 2625 2626 if (!pnfs_layout_can_be_returned(lo) || 2627 !pnfs_find_first_lseg(lo, range, range->iomode)) 2628 return false; 2629 2630 head = &NFS_I(lo->plh_inode)->open_files; 2631 list_for_each_entry_rcu(ctx, head, list) { 2632 if (ctx->state) 2633 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE); 2634 } 2635 2636 switch (range->iomode) { 2637 default: 2638 break; 2639 case IOMODE_READ: 2640 mode &= ~FMODE_WRITE; 2641 break; 2642 case IOMODE_RW: 2643 if (pnfs_find_first_lseg(lo, range, IOMODE_READ)) 2644 mode &= ~FMODE_READ; 2645 } 2646 return mode == 0; 2647 } 2648 2649 static int pnfs_layout_return_unused_byserver(struct nfs_server *server, 2650 void *data) 2651 { 2652 const struct pnfs_layout_range *range = data; 2653 const struct cred *cred; 2654 struct pnfs_layout_hdr *lo; 2655 struct inode *inode; 2656 nfs4_stateid stateid; 2657 enum pnfs_iomode iomode; 2658 2659 restart: 2660 rcu_read_lock(); 2661 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 2662 inode = lo->plh_inode; 2663 if (!inode || !pnfs_layout_can_be_returned(lo) || 2664 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 2665 continue; 2666 spin_lock(&inode->i_lock); 2667 if (!lo->plh_inode || 2668 !pnfs_should_return_unused_layout(lo, range)) { 2669 spin_unlock(&inode->i_lock); 2670 continue; 2671 } 2672 pnfs_get_layout_hdr(lo); 2673 pnfs_set_plh_return_info(lo, range->iomode, 0); 2674 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, 2675 range, 0) != 0 || 2676 !pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode)) { 2677 spin_unlock(&inode->i_lock); 2678 rcu_read_unlock(); 2679 pnfs_put_layout_hdr(lo); 2680 cond_resched(); 2681 goto restart; 2682 } 2683 spin_unlock(&inode->i_lock); 2684 rcu_read_unlock(); 2685 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, false); 2686 pnfs_put_layout_hdr(lo); 2687 cond_resched(); 2688 goto restart; 2689 } 2690 rcu_read_unlock(); 2691 return 0; 2692 } 2693 2694 void 2695 pnfs_layout_return_unused_byclid(struct nfs_client *clp, 2696 enum pnfs_iomode iomode) 2697 { 2698 struct pnfs_layout_range range = { 2699 .iomode = iomode, 2700 .offset = 0, 2701 .length = NFS4_MAX_UINT64, 2702 }; 2703 2704 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver, 2705 &range); 2706 } 2707 2708 /* Check if we have we have a valid layout but if there isn't an intersection 2709 * between the request and the pgio->pg_lseg, put this pgio->pg_lseg away. 2710 */ 2711 void 2712 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio, 2713 struct nfs_page *req) 2714 { 2715 if (pgio->pg_lseg == NULL || 2716 (test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags) && 2717 pnfs_lseg_request_intersecting(pgio->pg_lseg, req))) 2718 return; 2719 pnfs_put_lseg(pgio->pg_lseg); 2720 pgio->pg_lseg = NULL; 2721 } 2722 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); 2723 2724 void 2725 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2726 { 2727 u64 rd_size; 2728 2729 pnfs_generic_pg_check_layout(pgio, req); 2730 if (pgio->pg_lseg == NULL) { 2731 if (pgio->pg_dreq == NULL) 2732 rd_size = i_size_read(pgio->pg_inode) - req_offset(req); 2733 else 2734 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq, 2735 req_offset(req)); 2736 2737 pgio->pg_lseg = 2738 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 2739 req_offset(req), rd_size, 2740 IOMODE_READ, false, 2741 nfs_io_gfp_mask()); 2742 if (IS_ERR(pgio->pg_lseg)) { 2743 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2744 pgio->pg_lseg = NULL; 2745 return; 2746 } 2747 } 2748 /* If no lseg, fall back to read through mds */ 2749 if (pgio->pg_lseg == NULL) 2750 nfs_pageio_reset_read_mds(pgio); 2751 2752 } 2753 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); 2754 2755 void 2756 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 2757 struct nfs_page *req, u64 wb_size) 2758 { 2759 pnfs_generic_pg_check_layout(pgio, req); 2760 if (pgio->pg_lseg == NULL) { 2761 pgio->pg_lseg = 2762 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 2763 req_offset(req), wb_size, IOMODE_RW, 2764 false, nfs_io_gfp_mask()); 2765 if (IS_ERR(pgio->pg_lseg)) { 2766 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2767 pgio->pg_lseg = NULL; 2768 return; 2769 } 2770 } 2771 /* If no lseg, fall back to write through mds */ 2772 if (pgio->pg_lseg == NULL) 2773 nfs_pageio_reset_write_mds(pgio); 2774 } 2775 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); 2776 2777 void 2778 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) 2779 { 2780 if (desc->pg_lseg) { 2781 pnfs_put_lseg(desc->pg_lseg); 2782 desc->pg_lseg = NULL; 2783 } 2784 } 2785 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); 2786 2787 /* 2788 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 2789 * of bytes (maximum @req->wb_bytes) that can be coalesced. 2790 */ 2791 size_t 2792 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 2793 struct nfs_page *prev, struct nfs_page *req) 2794 { 2795 unsigned int size; 2796 u64 seg_end, req_start, seg_left; 2797 2798 size = nfs_generic_pg_test(pgio, prev, req); 2799 if (!size) 2800 return 0; 2801 2802 /* 2803 * 'size' contains the number of bytes left in the current page (up 2804 * to the original size asked for in @req->wb_bytes). 2805 * 2806 * Calculate how many bytes are left in the layout segment 2807 * and if there are less bytes than 'size', return that instead. 2808 * 2809 * Please also note that 'end_offset' is actually the offset of the 2810 * first byte that lies outside the pnfs_layout_range. FIXME? 2811 * 2812 */ 2813 if (pgio->pg_lseg) { 2814 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset, 2815 pgio->pg_lseg->pls_range.length); 2816 req_start = req_offset(req); 2817 2818 /* start of request is past the last byte of this segment */ 2819 if (req_start >= seg_end) 2820 return 0; 2821 2822 /* adjust 'size' iff there are fewer bytes left in the 2823 * segment than what nfs_generic_pg_test returned */ 2824 seg_left = seg_end - req_start; 2825 if (seg_left < size) 2826 size = (unsigned int)seg_left; 2827 } 2828 2829 return size; 2830 } 2831 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); 2832 2833 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) 2834 { 2835 struct nfs_pageio_descriptor pgio; 2836 2837 /* Resend all requests through the MDS */ 2838 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, 2839 hdr->completion_ops); 2840 return nfs_pageio_resend(&pgio, hdr); 2841 } 2842 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); 2843 2844 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) 2845 { 2846 2847 dprintk("pnfs write error = %d\n", hdr->pnfs_error); 2848 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2849 PNFS_LAYOUTRET_ON_ERROR) { 2850 pnfs_return_layout(hdr->inode); 2851 } 2852 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2853 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); 2854 } 2855 2856 /* 2857 * Called by non rpc-based layout drivers 2858 */ 2859 void pnfs_ld_write_done(struct nfs_pgio_header *hdr) 2860 { 2861 if (likely(!hdr->pnfs_error)) { 2862 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, 2863 hdr->mds_offset + hdr->res.count); 2864 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2865 } 2866 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); 2867 if (unlikely(hdr->pnfs_error)) 2868 pnfs_ld_handle_write_error(hdr); 2869 hdr->mds_ops->rpc_release(hdr); 2870 } 2871 EXPORT_SYMBOL_GPL(pnfs_ld_write_done); 2872 2873 static void 2874 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, 2875 struct nfs_pgio_header *hdr) 2876 { 2877 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2878 2879 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2880 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 2881 nfs_pageio_reset_write_mds(desc); 2882 mirror->pg_recoalesce = 1; 2883 } 2884 hdr->completion_ops->completion(hdr); 2885 } 2886 2887 static enum pnfs_try_status 2888 pnfs_try_to_write_data(struct nfs_pgio_header *hdr, 2889 const struct rpc_call_ops *call_ops, 2890 struct pnfs_layout_segment *lseg, 2891 int how) 2892 { 2893 struct inode *inode = hdr->inode; 2894 enum pnfs_try_status trypnfs; 2895 struct nfs_server *nfss = NFS_SERVER(inode); 2896 2897 hdr->mds_ops = call_ops; 2898 2899 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, 2900 inode->i_ino, hdr->args.count, hdr->args.offset, how); 2901 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); 2902 if (trypnfs != PNFS_NOT_ATTEMPTED) 2903 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); 2904 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 2905 return trypnfs; 2906 } 2907 2908 static void 2909 pnfs_do_write(struct nfs_pageio_descriptor *desc, 2910 struct nfs_pgio_header *hdr, int how) 2911 { 2912 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 2913 struct pnfs_layout_segment *lseg = desc->pg_lseg; 2914 enum pnfs_try_status trypnfs; 2915 2916 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); 2917 switch (trypnfs) { 2918 case PNFS_NOT_ATTEMPTED: 2919 pnfs_write_through_mds(desc, hdr); 2920 break; 2921 case PNFS_ATTEMPTED: 2922 break; 2923 case PNFS_TRY_AGAIN: 2924 /* cleanup hdr and prepare to redo pnfs */ 2925 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 2926 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 2927 list_splice_init(&hdr->pages, &mirror->pg_list); 2928 mirror->pg_recoalesce = 1; 2929 } 2930 hdr->mds_ops->rpc_release(hdr); 2931 } 2932 } 2933 2934 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) 2935 { 2936 pnfs_put_lseg(hdr->lseg); 2937 nfs_pgio_header_free(hdr); 2938 } 2939 2940 int 2941 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 2942 { 2943 struct nfs_pgio_header *hdr; 2944 int ret; 2945 2946 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 2947 if (!hdr) { 2948 desc->pg_error = -ENOMEM; 2949 return desc->pg_error; 2950 } 2951 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); 2952 2953 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 2954 ret = nfs_generic_pgio(desc, hdr); 2955 if (!ret) 2956 pnfs_do_write(desc, hdr, desc->pg_ioflags); 2957 2958 return ret; 2959 } 2960 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); 2961 2962 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) 2963 { 2964 struct nfs_pageio_descriptor pgio; 2965 2966 /* Resend all requests through the MDS */ 2967 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); 2968 return nfs_pageio_resend(&pgio, hdr); 2969 } 2970 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); 2971 2972 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) 2973 { 2974 dprintk("pnfs read error = %d\n", hdr->pnfs_error); 2975 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2976 PNFS_LAYOUTRET_ON_ERROR) { 2977 pnfs_return_layout(hdr->inode); 2978 } 2979 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2980 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); 2981 } 2982 2983 /* 2984 * Called by non rpc-based layout drivers 2985 */ 2986 void pnfs_ld_read_done(struct nfs_pgio_header *hdr) 2987 { 2988 if (likely(!hdr->pnfs_error)) 2989 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2990 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); 2991 if (unlikely(hdr->pnfs_error)) 2992 pnfs_ld_handle_read_error(hdr); 2993 hdr->mds_ops->rpc_release(hdr); 2994 } 2995 EXPORT_SYMBOL_GPL(pnfs_ld_read_done); 2996 2997 static void 2998 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, 2999 struct nfs_pgio_header *hdr) 3000 { 3001 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 3002 3003 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 3004 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 3005 nfs_pageio_reset_read_mds(desc); 3006 mirror->pg_recoalesce = 1; 3007 } 3008 hdr->completion_ops->completion(hdr); 3009 } 3010 3011 /* 3012 * Call the appropriate parallel I/O subsystem read function. 3013 */ 3014 static enum pnfs_try_status 3015 pnfs_try_to_read_data(struct nfs_pgio_header *hdr, 3016 const struct rpc_call_ops *call_ops, 3017 struct pnfs_layout_segment *lseg) 3018 { 3019 struct inode *inode = hdr->inode; 3020 struct nfs_server *nfss = NFS_SERVER(inode); 3021 enum pnfs_try_status trypnfs; 3022 3023 hdr->mds_ops = call_ops; 3024 3025 dprintk("%s: Reading ino:%lu %u@%llu\n", 3026 __func__, inode->i_ino, hdr->args.count, hdr->args.offset); 3027 3028 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); 3029 if (trypnfs != PNFS_NOT_ATTEMPTED) 3030 nfs_inc_stats(inode, NFSIOS_PNFS_READ); 3031 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 3032 return trypnfs; 3033 } 3034 3035 /* Resend all requests through pnfs. */ 3036 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr, 3037 unsigned int mirror_idx) 3038 { 3039 struct nfs_pageio_descriptor pgio; 3040 3041 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 3042 /* Prevent deadlocks with layoutreturn! */ 3043 pnfs_put_lseg(hdr->lseg); 3044 hdr->lseg = NULL; 3045 3046 nfs_pageio_init_read(&pgio, hdr->inode, false, 3047 hdr->completion_ops); 3048 pgio.pg_mirror_idx = mirror_idx; 3049 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr); 3050 } 3051 } 3052 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); 3053 3054 static void 3055 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) 3056 { 3057 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 3058 struct pnfs_layout_segment *lseg = desc->pg_lseg; 3059 enum pnfs_try_status trypnfs; 3060 3061 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); 3062 switch (trypnfs) { 3063 case PNFS_NOT_ATTEMPTED: 3064 pnfs_read_through_mds(desc, hdr); 3065 break; 3066 case PNFS_ATTEMPTED: 3067 break; 3068 case PNFS_TRY_AGAIN: 3069 /* cleanup hdr and prepare to redo pnfs */ 3070 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 3071 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 3072 list_splice_init(&hdr->pages, &mirror->pg_list); 3073 mirror->pg_recoalesce = 1; 3074 } 3075 hdr->mds_ops->rpc_release(hdr); 3076 } 3077 } 3078 3079 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) 3080 { 3081 pnfs_put_lseg(hdr->lseg); 3082 nfs_pgio_header_free(hdr); 3083 } 3084 3085 int 3086 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) 3087 { 3088 struct nfs_pgio_header *hdr; 3089 int ret; 3090 3091 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 3092 if (!hdr) { 3093 desc->pg_error = -ENOMEM; 3094 return desc->pg_error; 3095 } 3096 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); 3097 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 3098 ret = nfs_generic_pgio(desc, hdr); 3099 if (!ret) 3100 pnfs_do_read(desc, hdr); 3101 return ret; 3102 } 3103 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); 3104 3105 static void pnfs_clear_layoutcommitting(struct inode *inode) 3106 { 3107 unsigned long *bitlock = &NFS_I(inode)->flags; 3108 3109 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 3110 smp_mb__after_atomic(); 3111 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 3112 } 3113 3114 /* 3115 * There can be multiple RW segments. 3116 */ 3117 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 3118 { 3119 struct pnfs_layout_segment *lseg; 3120 3121 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { 3122 if (lseg->pls_range.iomode == IOMODE_RW && 3123 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 3124 list_add(&lseg->pls_lc_list, listp); 3125 } 3126 } 3127 3128 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) 3129 { 3130 struct pnfs_layout_segment *lseg, *tmp; 3131 3132 /* Matched by references in pnfs_set_layoutcommit */ 3133 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { 3134 list_del_init(&lseg->pls_lc_list); 3135 pnfs_put_lseg(lseg); 3136 } 3137 3138 pnfs_clear_layoutcommitting(inode); 3139 } 3140 3141 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) 3142 { 3143 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); 3144 } 3145 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); 3146 3147 void 3148 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, 3149 loff_t end_pos) 3150 { 3151 struct nfs_inode *nfsi = NFS_I(inode); 3152 bool mark_as_dirty = false; 3153 3154 spin_lock(&inode->i_lock); 3155 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 3156 nfsi->layout->plh_lwb = end_pos; 3157 mark_as_dirty = true; 3158 dprintk("%s: Set layoutcommit for inode %lu ", 3159 __func__, inode->i_ino); 3160 } else if (end_pos > nfsi->layout->plh_lwb) 3161 nfsi->layout->plh_lwb = end_pos; 3162 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { 3163 /* references matched in nfs4_layoutcommit_release */ 3164 pnfs_get_lseg(lseg); 3165 } 3166 spin_unlock(&inode->i_lock); 3167 dprintk("%s: lseg %p end_pos %llu\n", 3168 __func__, lseg, nfsi->layout->plh_lwb); 3169 3170 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one 3171 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ 3172 if (mark_as_dirty) 3173 mark_inode_dirty_sync(inode); 3174 } 3175 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); 3176 3177 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 3178 { 3179 struct nfs_server *nfss = NFS_SERVER(data->args.inode); 3180 3181 if (nfss->pnfs_curr_ld->cleanup_layoutcommit) 3182 nfss->pnfs_curr_ld->cleanup_layoutcommit(data); 3183 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); 3184 } 3185 3186 /* 3187 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and 3188 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough 3189 * data to disk to allow the server to recover the data if it crashes. 3190 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag 3191 * is off, and a COMMIT is sent to a data server, or 3192 * if WRITEs to a data server return NFS_DATA_SYNC. 3193 */ 3194 int 3195 pnfs_layoutcommit_inode(struct inode *inode, bool sync) 3196 { 3197 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 3198 struct nfs4_layoutcommit_data *data; 3199 struct nfs_inode *nfsi = NFS_I(inode); 3200 loff_t end_pos; 3201 int status; 3202 3203 if (!pnfs_layoutcommit_outstanding(inode)) 3204 return 0; 3205 3206 dprintk("--> %s inode %lu\n", __func__, inode->i_ino); 3207 3208 status = -EAGAIN; 3209 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { 3210 if (!sync) 3211 goto out; 3212 status = wait_on_bit_lock_action(&nfsi->flags, 3213 NFS_INO_LAYOUTCOMMITTING, 3214 nfs_wait_bit_killable, 3215 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 3216 if (status) 3217 goto out; 3218 } 3219 3220 status = -ENOMEM; 3221 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ 3222 data = kzalloc(sizeof(*data), nfs_io_gfp_mask()); 3223 if (!data) 3224 goto clear_layoutcommitting; 3225 3226 status = 0; 3227 spin_lock(&inode->i_lock); 3228 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 3229 goto out_unlock; 3230 3231 INIT_LIST_HEAD(&data->lseg_list); 3232 pnfs_list_write_lseg(inode, &data->lseg_list); 3233 3234 end_pos = nfsi->layout->plh_lwb; 3235 3236 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); 3237 data->cred = get_cred(nfsi->layout->plh_lc_cred); 3238 spin_unlock(&inode->i_lock); 3239 3240 data->args.inode = inode; 3241 nfs_fattr_init(&data->fattr); 3242 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3243 data->res.fattr = &data->fattr; 3244 if (end_pos != 0) 3245 data->args.lastbytewritten = end_pos - 1; 3246 else 3247 data->args.lastbytewritten = U64_MAX; 3248 data->res.server = NFS_SERVER(inode); 3249 3250 if (ld->prepare_layoutcommit) { 3251 status = ld->prepare_layoutcommit(&data->args); 3252 if (status) { 3253 put_cred(data->cred); 3254 spin_lock(&inode->i_lock); 3255 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); 3256 if (end_pos > nfsi->layout->plh_lwb) 3257 nfsi->layout->plh_lwb = end_pos; 3258 goto out_unlock; 3259 } 3260 } 3261 3262 3263 status = nfs4_proc_layoutcommit(data, sync); 3264 out: 3265 if (status) 3266 mark_inode_dirty_sync(inode); 3267 dprintk("<-- %s status %d\n", __func__, status); 3268 return status; 3269 out_unlock: 3270 spin_unlock(&inode->i_lock); 3271 kfree(data); 3272 clear_layoutcommitting: 3273 pnfs_clear_layoutcommitting(inode); 3274 goto out; 3275 } 3276 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); 3277 3278 int 3279 pnfs_generic_sync(struct inode *inode, bool datasync) 3280 { 3281 return pnfs_layoutcommit_inode(inode, true); 3282 } 3283 EXPORT_SYMBOL_GPL(pnfs_generic_sync); 3284 3285 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 3286 { 3287 struct nfs4_threshold *thp; 3288 3289 thp = kzalloc(sizeof(*thp), nfs_io_gfp_mask()); 3290 if (!thp) { 3291 dprintk("%s mdsthreshold allocation failed\n", __func__); 3292 return NULL; 3293 } 3294 return thp; 3295 } 3296 3297 #if IS_ENABLED(CONFIG_NFS_V4_2) 3298 int 3299 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 3300 { 3301 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 3302 struct nfs_server *server = NFS_SERVER(inode); 3303 struct nfs_inode *nfsi = NFS_I(inode); 3304 struct nfs42_layoutstat_data *data; 3305 struct pnfs_layout_hdr *hdr; 3306 int status = 0; 3307 3308 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) 3309 goto out; 3310 3311 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) 3312 goto out; 3313 3314 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) 3315 goto out; 3316 3317 spin_lock(&inode->i_lock); 3318 if (!NFS_I(inode)->layout) { 3319 spin_unlock(&inode->i_lock); 3320 goto out_clear_layoutstats; 3321 } 3322 hdr = NFS_I(inode)->layout; 3323 pnfs_get_layout_hdr(hdr); 3324 spin_unlock(&inode->i_lock); 3325 3326 data = kzalloc(sizeof(*data), gfp_flags); 3327 if (!data) { 3328 status = -ENOMEM; 3329 goto out_put; 3330 } 3331 3332 data->args.fh = NFS_FH(inode); 3333 data->args.inode = inode; 3334 status = ld->prepare_layoutstats(&data->args); 3335 if (status) 3336 goto out_free; 3337 3338 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); 3339 3340 out: 3341 dprintk("%s returns %d\n", __func__, status); 3342 return status; 3343 3344 out_free: 3345 kfree(data); 3346 out_put: 3347 pnfs_put_layout_hdr(hdr); 3348 out_clear_layoutstats: 3349 smp_mb__before_atomic(); 3350 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); 3351 smp_mb__after_atomic(); 3352 goto out; 3353 } 3354 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); 3355 #endif 3356 3357 unsigned int layoutstats_timer; 3358 module_param(layoutstats_timer, uint, 0644); 3359 EXPORT_SYMBOL_GPL(layoutstats_timer); 3360