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 static int pnfs_layout_return_on_reboot(struct pnfs_layout_hdr *lo); 65 66 /* Return the registered pnfs layout driver module matching given id */ 67 static struct pnfs_layoutdriver_type * 68 find_pnfs_driver_locked(u32 id) 69 { 70 struct pnfs_layoutdriver_type *local; 71 72 list_for_each_entry(local, &pnfs_modules_tbl, pnfs_tblid) 73 if (local->id == id) 74 goto out; 75 local = NULL; 76 out: 77 dprintk("%s: Searching for id %u, found %p\n", __func__, id, local); 78 return local; 79 } 80 81 static struct pnfs_layoutdriver_type * 82 find_pnfs_driver(u32 id) 83 { 84 struct pnfs_layoutdriver_type *local; 85 86 spin_lock(&pnfs_spinlock); 87 local = find_pnfs_driver_locked(id); 88 if (local != NULL && !try_module_get(local->owner)) { 89 dprintk("%s: Could not grab reference on module\n", __func__); 90 local = NULL; 91 } 92 spin_unlock(&pnfs_spinlock); 93 return local; 94 } 95 96 const struct pnfs_layoutdriver_type *pnfs_find_layoutdriver(u32 id) 97 { 98 return find_pnfs_driver(id); 99 } 100 101 void pnfs_put_layoutdriver(const struct pnfs_layoutdriver_type *ld) 102 { 103 if (ld) 104 module_put(ld->owner); 105 } 106 107 void 108 unset_pnfs_layoutdriver(struct nfs_server *nfss) 109 { 110 if (nfss->pnfs_curr_ld) { 111 if (nfss->pnfs_curr_ld->clear_layoutdriver) 112 nfss->pnfs_curr_ld->clear_layoutdriver(nfss); 113 /* Decrement the MDS count. Purge the deviceid cache if zero */ 114 if (atomic_dec_and_test(&nfss->nfs_client->cl_mds_count)) 115 nfs4_deviceid_purge_client(nfss->nfs_client); 116 module_put(nfss->pnfs_curr_ld->owner); 117 } 118 nfss->pnfs_curr_ld = NULL; 119 } 120 121 /* 122 * When the server sends a list of layout types, we choose one in the order 123 * given in the list below. 124 * 125 * FIXME: should this list be configurable in some fashion? module param? 126 * mount option? something else? 127 */ 128 static const u32 ld_prefs[] = { 129 LAYOUT_SCSI, 130 LAYOUT_BLOCK_VOLUME, 131 LAYOUT_OSD2_OBJECTS, 132 LAYOUT_FLEX_FILES, 133 LAYOUT_NFSV4_1_FILES, 134 0 135 }; 136 137 static int 138 ld_cmp(const void *e1, const void *e2) 139 { 140 u32 ld1 = *((u32 *)e1); 141 u32 ld2 = *((u32 *)e2); 142 int i; 143 144 for (i = 0; ld_prefs[i] != 0; i++) { 145 if (ld1 == ld_prefs[i]) 146 return -1; 147 148 if (ld2 == ld_prefs[i]) 149 return 1; 150 } 151 return 0; 152 } 153 154 /* 155 * Try to set the server's pnfs module to the pnfs layout type specified by id. 156 * Currently only one pNFS layout driver per filesystem is supported. 157 * 158 * @ids array of layout types supported by MDS. 159 */ 160 void 161 set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, 162 struct nfs_fsinfo *fsinfo) 163 { 164 struct pnfs_layoutdriver_type *ld_type = NULL; 165 u32 id; 166 int i; 167 168 if (fsinfo->nlayouttypes == 0) 169 goto out_no_driver; 170 if (!(server->nfs_client->cl_exchange_flags & 171 (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { 172 printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n", 173 __func__, server->nfs_client->cl_exchange_flags); 174 goto out_no_driver; 175 } 176 177 sort(fsinfo->layouttype, fsinfo->nlayouttypes, 178 sizeof(*fsinfo->layouttype), ld_cmp, NULL); 179 180 for (i = 0; i < fsinfo->nlayouttypes; i++) { 181 id = fsinfo->layouttype[i]; 182 ld_type = find_pnfs_driver(id); 183 if (!ld_type) { 184 request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, 185 id); 186 ld_type = find_pnfs_driver(id); 187 } 188 if (ld_type) 189 break; 190 } 191 192 if (!ld_type) { 193 dprintk("%s: No pNFS module found!\n", __func__); 194 goto out_no_driver; 195 } 196 197 server->pnfs_curr_ld = ld_type; 198 if (ld_type->set_layoutdriver 199 && ld_type->set_layoutdriver(server, mntfh)) { 200 printk(KERN_ERR "NFS: %s: Error initializing pNFS layout " 201 "driver %u.\n", __func__, id); 202 module_put(ld_type->owner); 203 goto out_no_driver; 204 } 205 /* Bump the MDS count */ 206 atomic_inc(&server->nfs_client->cl_mds_count); 207 208 dprintk("%s: pNFS module for %u set\n", __func__, id); 209 return; 210 211 out_no_driver: 212 dprintk("%s: Using NFSv4 I/O\n", __func__); 213 server->pnfs_curr_ld = NULL; 214 } 215 216 int 217 pnfs_register_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 218 { 219 int status = -EINVAL; 220 struct pnfs_layoutdriver_type *tmp; 221 222 if (ld_type->id == 0) { 223 printk(KERN_ERR "NFS: %s id 0 is reserved\n", __func__); 224 return status; 225 } 226 if (!ld_type->alloc_lseg || !ld_type->free_lseg) { 227 printk(KERN_ERR "NFS: %s Layout driver must provide " 228 "alloc_lseg and free_lseg.\n", __func__); 229 return status; 230 } 231 232 spin_lock(&pnfs_spinlock); 233 tmp = find_pnfs_driver_locked(ld_type->id); 234 if (!tmp) { 235 list_add(&ld_type->pnfs_tblid, &pnfs_modules_tbl); 236 status = 0; 237 dprintk("%s Registering id:%u name:%s\n", __func__, ld_type->id, 238 ld_type->name); 239 } else { 240 printk(KERN_ERR "NFS: %s Module with id %d already loaded!\n", 241 __func__, ld_type->id); 242 } 243 spin_unlock(&pnfs_spinlock); 244 245 return status; 246 } 247 EXPORT_SYMBOL_GPL(pnfs_register_layoutdriver); 248 249 void 250 pnfs_unregister_layoutdriver(struct pnfs_layoutdriver_type *ld_type) 251 { 252 dprintk("%s Deregistering id:%u\n", __func__, ld_type->id); 253 spin_lock(&pnfs_spinlock); 254 list_del(&ld_type->pnfs_tblid); 255 spin_unlock(&pnfs_spinlock); 256 } 257 EXPORT_SYMBOL_GPL(pnfs_unregister_layoutdriver); 258 259 /* 260 * pNFS client layout cache 261 */ 262 263 /* Need to hold i_lock if caller does not already hold reference */ 264 void 265 pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo) 266 { 267 refcount_inc(&lo->plh_refcount); 268 } 269 270 static struct pnfs_layout_hdr * 271 pnfs_alloc_layout_hdr(struct inode *ino, gfp_t gfp_flags) 272 { 273 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 274 return ld->alloc_layout_hdr(ino, gfp_flags); 275 } 276 277 static void 278 pnfs_free_layout_hdr(struct pnfs_layout_hdr *lo) 279 { 280 struct nfs_server *server = NFS_SERVER(lo->plh_inode); 281 struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld; 282 283 if (test_and_clear_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) { 284 struct nfs_client *clp = server->nfs_client; 285 286 spin_lock(&clp->cl_lock); 287 list_del_rcu(&lo->plh_layouts); 288 spin_unlock(&clp->cl_lock); 289 } 290 put_cred(lo->plh_lc_cred); 291 return ld->free_layout_hdr(lo); 292 } 293 294 static void 295 pnfs_detach_layout_hdr(struct pnfs_layout_hdr *lo) 296 { 297 struct nfs_inode *nfsi = NFS_I(lo->plh_inode); 298 dprintk("%s: freeing layout cache %p\n", __func__, lo); 299 nfsi->layout = NULL; 300 /* Reset MDS Threshold I/O counters */ 301 nfsi->write_io = 0; 302 nfsi->read_io = 0; 303 } 304 305 void 306 pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo) 307 { 308 struct inode *inode; 309 unsigned long i_state; 310 311 if (!lo) 312 return; 313 inode = lo->plh_inode; 314 pnfs_layoutreturn_before_put_layout_hdr(lo); 315 316 if (refcount_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) { 317 if (!list_empty(&lo->plh_segs)) 318 WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n"); 319 pnfs_detach_layout_hdr(lo); 320 i_state = inode->i_state; 321 spin_unlock(&inode->i_lock); 322 pnfs_free_layout_hdr(lo); 323 /* Notify pnfs_destroy_layout_final() that we're done */ 324 if (i_state & (I_FREEING | I_CLEAR)) 325 wake_up_var(lo); 326 } 327 } 328 329 static struct inode * 330 pnfs_grab_inode_layout_hdr(struct pnfs_layout_hdr *lo) 331 { 332 struct inode *inode = igrab(lo->plh_inode); 333 if (inode) 334 return inode; 335 set_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags); 336 return NULL; 337 } 338 339 /* 340 * Compare 2 layout stateid sequence ids, to see which is newer, 341 * taking into account wraparound issues. 342 */ 343 static bool pnfs_seqid_is_newer(u32 s1, u32 s2) 344 { 345 return (s32)(s1 - s2) > 0; 346 } 347 348 static void pnfs_barrier_update(struct pnfs_layout_hdr *lo, u32 newseq) 349 { 350 if (pnfs_seqid_is_newer(newseq, lo->plh_barrier) || !lo->plh_barrier) 351 lo->plh_barrier = newseq; 352 } 353 354 static void 355 pnfs_set_plh_return_info(struct pnfs_layout_hdr *lo, enum pnfs_iomode iomode, 356 u32 seq) 357 { 358 if (lo->plh_return_iomode != 0 && lo->plh_return_iomode != iomode) 359 iomode = IOMODE_ANY; 360 lo->plh_return_iomode = iomode; 361 set_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); 362 /* 363 * We must set lo->plh_return_seq to avoid livelocks with 364 * pnfs_layout_need_return() 365 */ 366 if (seq == 0) 367 seq = be32_to_cpu(lo->plh_stateid.seqid); 368 if (!lo->plh_return_seq || pnfs_seqid_is_newer(seq, lo->plh_return_seq)) 369 lo->plh_return_seq = seq; 370 pnfs_barrier_update(lo, seq); 371 } 372 373 static void 374 pnfs_clear_layoutreturn_info(struct pnfs_layout_hdr *lo) 375 { 376 struct pnfs_layout_segment *lseg; 377 lo->plh_return_iomode = 0; 378 lo->plh_return_seq = 0; 379 clear_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags); 380 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 381 if (!test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 382 continue; 383 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 384 } 385 } 386 387 static void pnfs_clear_layoutreturn_waitbit(struct pnfs_layout_hdr *lo) 388 { 389 clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); 390 clear_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags); 391 smp_mb__after_atomic(); 392 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); 393 rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq); 394 } 395 396 static void 397 pnfs_clear_lseg_state(struct pnfs_layout_segment *lseg, 398 struct list_head *free_me) 399 { 400 clear_bit(NFS_LSEG_ROC, &lseg->pls_flags); 401 clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 402 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) 403 pnfs_lseg_dec_and_remove_zero(lseg, free_me); 404 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 405 pnfs_lseg_dec_and_remove_zero(lseg, free_me); 406 } 407 408 /* 409 * Update the seqid of a layout stateid after receiving 410 * NFS4ERR_OLD_STATEID 411 */ 412 bool nfs4_layout_refresh_old_stateid(nfs4_stateid *dst, 413 struct pnfs_layout_range *dst_range, 414 struct inode *inode) 415 { 416 struct pnfs_layout_hdr *lo; 417 struct pnfs_layout_range range = { 418 .iomode = IOMODE_ANY, 419 .offset = 0, 420 .length = NFS4_MAX_UINT64, 421 }; 422 bool ret = false; 423 LIST_HEAD(head); 424 int err; 425 426 spin_lock(&inode->i_lock); 427 lo = NFS_I(inode)->layout; 428 if (lo && pnfs_layout_is_valid(lo) && 429 nfs4_stateid_match_other(dst, &lo->plh_stateid)) { 430 /* Is our call using the most recent seqid? If so, bump it */ 431 if (!nfs4_stateid_is_newer(&lo->plh_stateid, dst)) { 432 nfs4_stateid_seqid_inc(dst); 433 ret = true; 434 goto out; 435 } 436 /* Try to update the seqid to the most recent */ 437 err = pnfs_mark_matching_lsegs_return(lo, &head, &range, 0); 438 if (err != -EBUSY) { 439 dst->seqid = lo->plh_stateid.seqid; 440 *dst_range = range; 441 ret = true; 442 } 443 } 444 out: 445 spin_unlock(&inode->i_lock); 446 pnfs_free_lseg_list(&head); 447 return ret; 448 } 449 450 /* 451 * Mark a pnfs_layout_hdr and all associated layout segments as invalid 452 * 453 * In order to continue using the pnfs_layout_hdr, a full recovery 454 * is required. 455 * Note that caller must hold inode->i_lock. 456 */ 457 int 458 pnfs_mark_layout_stateid_invalid(struct pnfs_layout_hdr *lo, 459 struct list_head *lseg_list) 460 { 461 struct pnfs_layout_range range = { 462 .iomode = IOMODE_ANY, 463 .offset = 0, 464 .length = NFS4_MAX_UINT64, 465 }; 466 struct pnfs_layout_segment *lseg, *next; 467 468 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 469 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 470 pnfs_clear_lseg_state(lseg, lseg_list); 471 pnfs_clear_layoutreturn_info(lo); 472 pnfs_free_returned_lsegs(lo, lseg_list, &range, 0); 473 set_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags); 474 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags) && 475 !test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 476 pnfs_clear_layoutreturn_waitbit(lo); 477 return !list_empty(&lo->plh_segs); 478 } 479 480 static int pnfs_mark_layout_stateid_return(struct pnfs_layout_hdr *lo, 481 struct list_head *lseg_list, 482 enum pnfs_iomode iomode, u32 seq) 483 { 484 struct pnfs_layout_range range = { 485 .iomode = iomode, 486 .length = NFS4_MAX_UINT64, 487 }; 488 489 return pnfs_mark_matching_lsegs_return(lo, lseg_list, &range, seq); 490 } 491 492 static int 493 pnfs_iomode_to_fail_bit(u32 iomode) 494 { 495 return iomode == IOMODE_RW ? 496 NFS_LAYOUT_RW_FAILED : NFS_LAYOUT_RO_FAILED; 497 } 498 499 static void 500 pnfs_layout_set_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 501 { 502 lo->plh_retry_timestamp = jiffies; 503 if (!test_and_set_bit(fail_bit, &lo->plh_flags)) 504 refcount_inc(&lo->plh_refcount); 505 } 506 507 static void 508 pnfs_layout_clear_fail_bit(struct pnfs_layout_hdr *lo, int fail_bit) 509 { 510 if (test_and_clear_bit(fail_bit, &lo->plh_flags)) 511 refcount_dec(&lo->plh_refcount); 512 } 513 514 static void 515 pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) 516 { 517 struct inode *inode = lo->plh_inode; 518 struct pnfs_layout_range range = { 519 .iomode = iomode, 520 .offset = 0, 521 .length = NFS4_MAX_UINT64, 522 }; 523 LIST_HEAD(head); 524 525 spin_lock(&inode->i_lock); 526 pnfs_layout_set_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 527 pnfs_mark_matching_lsegs_return(lo, &head, &range, 0); 528 spin_unlock(&inode->i_lock); 529 pnfs_free_lseg_list(&head); 530 dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, 531 iomode == IOMODE_RW ? "RW" : "READ"); 532 } 533 534 static bool 535 pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) 536 { 537 unsigned long start, end; 538 int fail_bit = pnfs_iomode_to_fail_bit(iomode); 539 540 if (test_bit(fail_bit, &lo->plh_flags) == 0) 541 return false; 542 end = jiffies; 543 start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; 544 if (!time_in_range(lo->plh_retry_timestamp, start, end)) { 545 /* It is time to retry the failed layoutgets */ 546 pnfs_layout_clear_fail_bit(lo, fail_bit); 547 return false; 548 } 549 return true; 550 } 551 552 static void 553 pnfs_init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg, 554 const struct pnfs_layout_range *range, 555 const nfs4_stateid *stateid) 556 { 557 INIT_LIST_HEAD(&lseg->pls_list); 558 INIT_LIST_HEAD(&lseg->pls_lc_list); 559 INIT_LIST_HEAD(&lseg->pls_commits); 560 refcount_set(&lseg->pls_refcount, 1); 561 set_bit(NFS_LSEG_VALID, &lseg->pls_flags); 562 lseg->pls_layout = lo; 563 lseg->pls_range = *range; 564 lseg->pls_seq = be32_to_cpu(stateid->seqid); 565 } 566 567 static void pnfs_free_lseg(struct pnfs_layout_segment *lseg) 568 { 569 if (lseg != NULL) { 570 struct inode *inode = lseg->pls_layout->plh_inode; 571 NFS_SERVER(inode)->pnfs_curr_ld->free_lseg(lseg); 572 } 573 } 574 575 static void 576 pnfs_layout_remove_lseg(struct pnfs_layout_hdr *lo, 577 struct pnfs_layout_segment *lseg) 578 { 579 WARN_ON(test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 580 list_del_init(&lseg->pls_list); 581 /* Matched by pnfs_get_layout_hdr in pnfs_layout_insert_lseg */ 582 refcount_dec(&lo->plh_refcount); 583 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 584 return; 585 if (list_empty(&lo->plh_segs) && 586 !test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) && 587 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 588 if (atomic_read(&lo->plh_outstanding) == 0) 589 set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 590 clear_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 591 } 592 } 593 594 static bool 595 pnfs_cache_lseg_for_layoutreturn(struct pnfs_layout_hdr *lo, 596 struct pnfs_layout_segment *lseg) 597 { 598 if (test_and_clear_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags) && 599 pnfs_layout_is_valid(lo)) { 600 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 601 list_move_tail(&lseg->pls_list, &lo->plh_return_segs); 602 return true; 603 } 604 return false; 605 } 606 607 void 608 pnfs_put_lseg(struct pnfs_layout_segment *lseg) 609 { 610 struct pnfs_layout_hdr *lo; 611 struct inode *inode; 612 613 if (!lseg) 614 return; 615 616 dprintk("%s: lseg %p ref %d valid %d\n", __func__, lseg, 617 refcount_read(&lseg->pls_refcount), 618 test_bit(NFS_LSEG_VALID, &lseg->pls_flags)); 619 620 lo = lseg->pls_layout; 621 inode = lo->plh_inode; 622 623 if (refcount_dec_and_lock(&lseg->pls_refcount, &inode->i_lock)) { 624 pnfs_get_layout_hdr(lo); 625 pnfs_layout_remove_lseg(lo, lseg); 626 if (pnfs_cache_lseg_for_layoutreturn(lo, lseg)) 627 lseg = NULL; 628 spin_unlock(&inode->i_lock); 629 pnfs_free_lseg(lseg); 630 pnfs_put_layout_hdr(lo); 631 } 632 } 633 EXPORT_SYMBOL_GPL(pnfs_put_lseg); 634 635 /* 636 * is l2 fully contained in l1? 637 * start1 end1 638 * [----------------------------------) 639 * start2 end2 640 * [----------------) 641 */ 642 static bool 643 pnfs_lseg_range_contained(const struct pnfs_layout_range *l1, 644 const struct pnfs_layout_range *l2) 645 { 646 u64 start1 = l1->offset; 647 u64 end1 = pnfs_end_offset(start1, l1->length); 648 u64 start2 = l2->offset; 649 u64 end2 = pnfs_end_offset(start2, l2->length); 650 651 return (start1 <= start2) && (end1 >= end2); 652 } 653 654 static bool pnfs_lseg_dec_and_remove_zero(struct pnfs_layout_segment *lseg, 655 struct list_head *tmp_list) 656 { 657 if (!refcount_dec_and_test(&lseg->pls_refcount)) 658 return false; 659 pnfs_layout_remove_lseg(lseg->pls_layout, lseg); 660 list_add(&lseg->pls_list, tmp_list); 661 return true; 662 } 663 664 /* Returns 1 if lseg is removed from list, 0 otherwise */ 665 static int mark_lseg_invalid(struct pnfs_layout_segment *lseg, 666 struct list_head *tmp_list) 667 { 668 int rv = 0; 669 670 if (test_and_clear_bit(NFS_LSEG_VALID, &lseg->pls_flags)) { 671 /* Remove the reference keeping the lseg in the 672 * list. It will now be removed when all 673 * outstanding io is finished. 674 */ 675 dprintk("%s: lseg %p ref %d\n", __func__, lseg, 676 refcount_read(&lseg->pls_refcount)); 677 if (pnfs_lseg_dec_and_remove_zero(lseg, tmp_list)) 678 rv = 1; 679 } 680 return rv; 681 } 682 683 static bool 684 pnfs_should_free_range(const struct pnfs_layout_range *lseg_range, 685 const struct pnfs_layout_range *recall_range) 686 { 687 return (recall_range->iomode == IOMODE_ANY || 688 lseg_range->iomode == recall_range->iomode) && 689 pnfs_lseg_range_intersecting(lseg_range, recall_range); 690 } 691 692 static bool 693 pnfs_match_lseg_recall(const struct pnfs_layout_segment *lseg, 694 const struct pnfs_layout_range *recall_range, 695 u32 seq) 696 { 697 if (seq != 0 && pnfs_seqid_is_newer(lseg->pls_seq, seq)) 698 return false; 699 if (recall_range == NULL) 700 return true; 701 return pnfs_should_free_range(&lseg->pls_range, recall_range); 702 } 703 704 /** 705 * pnfs_mark_matching_lsegs_invalid - tear down lsegs or mark them for later 706 * @lo: layout header containing the lsegs 707 * @tmp_list: list head where doomed lsegs should go 708 * @recall_range: optional recall range argument to match (may be NULL) 709 * @seq: only invalidate lsegs obtained prior to this sequence (may be 0) 710 * 711 * Walk the list of lsegs in the layout header, and tear down any that should 712 * be destroyed. If "recall_range" is specified then the segment must match 713 * that range. If "seq" is non-zero, then only match segments that were handed 714 * out at or before that sequence. 715 * 716 * Returns number of matching invalid lsegs remaining in list after scanning 717 * it and purging them. 718 */ 719 int 720 pnfs_mark_matching_lsegs_invalid(struct pnfs_layout_hdr *lo, 721 struct list_head *tmp_list, 722 const struct pnfs_layout_range *recall_range, 723 u32 seq) 724 { 725 struct pnfs_layout_segment *lseg, *next; 726 struct nfs_server *server = NFS_SERVER(lo->plh_inode); 727 int remaining = 0; 728 729 dprintk("%s:Begin lo %p\n", __func__, lo); 730 731 if (list_empty(&lo->plh_segs)) 732 return 0; 733 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 734 if (pnfs_match_lseg_recall(lseg, recall_range, seq)) { 735 dprintk("%s: freeing lseg %p iomode %d seq %u " 736 "offset %llu length %llu\n", __func__, 737 lseg, lseg->pls_range.iomode, lseg->pls_seq, 738 lseg->pls_range.offset, lseg->pls_range.length); 739 if (mark_lseg_invalid(lseg, tmp_list)) 740 continue; 741 remaining++; 742 pnfs_lseg_cancel_io(server, lseg); 743 } 744 dprintk("%s:Return %i\n", __func__, remaining); 745 return remaining; 746 } 747 748 static void 749 pnfs_free_returned_lsegs(struct pnfs_layout_hdr *lo, 750 struct list_head *free_me, 751 const struct pnfs_layout_range *range, 752 u32 seq) 753 { 754 struct pnfs_layout_segment *lseg, *next; 755 756 list_for_each_entry_safe(lseg, next, &lo->plh_return_segs, pls_list) { 757 if (pnfs_match_lseg_recall(lseg, range, seq)) 758 list_move_tail(&lseg->pls_list, free_me); 759 } 760 } 761 762 /* note free_me must contain lsegs from a single layout_hdr */ 763 void 764 pnfs_free_lseg_list(struct list_head *free_me) 765 { 766 struct pnfs_layout_segment *lseg, *tmp; 767 768 if (list_empty(free_me)) 769 return; 770 771 list_for_each_entry_safe(lseg, tmp, free_me, pls_list) { 772 list_del(&lseg->pls_list); 773 pnfs_free_lseg(lseg); 774 } 775 } 776 777 static struct pnfs_layout_hdr *__pnfs_destroy_layout(struct nfs_inode *nfsi) 778 { 779 struct pnfs_layout_hdr *lo; 780 LIST_HEAD(tmp_list); 781 782 spin_lock(&nfsi->vfs_inode.i_lock); 783 lo = nfsi->layout; 784 if (lo) { 785 pnfs_get_layout_hdr(lo); 786 pnfs_mark_layout_stateid_invalid(lo, &tmp_list); 787 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RO_FAILED); 788 pnfs_layout_clear_fail_bit(lo, NFS_LAYOUT_RW_FAILED); 789 spin_unlock(&nfsi->vfs_inode.i_lock); 790 pnfs_free_lseg_list(&tmp_list); 791 nfs_commit_inode(&nfsi->vfs_inode, 0); 792 pnfs_put_layout_hdr(lo); 793 } else 794 spin_unlock(&nfsi->vfs_inode.i_lock); 795 return lo; 796 } 797 798 void pnfs_destroy_layout(struct nfs_inode *nfsi) 799 { 800 __pnfs_destroy_layout(nfsi); 801 } 802 EXPORT_SYMBOL_GPL(pnfs_destroy_layout); 803 804 static bool pnfs_layout_removed(struct nfs_inode *nfsi, 805 struct pnfs_layout_hdr *lo) 806 { 807 bool ret; 808 809 spin_lock(&nfsi->vfs_inode.i_lock); 810 ret = nfsi->layout != lo; 811 spin_unlock(&nfsi->vfs_inode.i_lock); 812 return ret; 813 } 814 815 void pnfs_destroy_layout_final(struct nfs_inode *nfsi) 816 { 817 struct pnfs_layout_hdr *lo = __pnfs_destroy_layout(nfsi); 818 819 if (lo) 820 wait_var_event(lo, pnfs_layout_removed(nfsi, lo)); 821 } 822 823 static bool 824 pnfs_layout_add_bulk_destroy_list(struct inode *inode, 825 struct list_head *layout_list) 826 { 827 struct pnfs_layout_hdr *lo; 828 bool ret = false; 829 830 spin_lock(&inode->i_lock); 831 lo = NFS_I(inode)->layout; 832 if (lo != NULL && list_empty(&lo->plh_bulk_destroy)) { 833 pnfs_get_layout_hdr(lo); 834 list_add(&lo->plh_bulk_destroy, layout_list); 835 ret = true; 836 } 837 spin_unlock(&inode->i_lock); 838 return ret; 839 } 840 841 /* Caller must hold rcu_read_lock and clp->cl_lock */ 842 static int 843 pnfs_layout_bulk_destroy_byserver_locked(struct nfs_client *clp, 844 struct nfs_server *server, 845 struct list_head *layout_list) 846 __must_hold(&clp->cl_lock) 847 __must_hold(RCU) 848 { 849 struct pnfs_layout_hdr *lo, *next; 850 struct inode *inode; 851 852 list_for_each_entry_safe(lo, next, &server->layouts, plh_layouts) { 853 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) || 854 test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) || 855 !list_empty(&lo->plh_bulk_destroy)) 856 continue; 857 /* If the sb is being destroyed, just bail */ 858 if (!nfs_sb_active(server->super)) 859 break; 860 inode = pnfs_grab_inode_layout_hdr(lo); 861 if (inode != NULL) { 862 if (pnfs_layout_add_bulk_destroy_list(inode, 863 layout_list)) 864 continue; 865 rcu_read_unlock(); 866 spin_unlock(&clp->cl_lock); 867 iput(inode); 868 } else { 869 rcu_read_unlock(); 870 spin_unlock(&clp->cl_lock); 871 } 872 nfs_sb_deactive(server->super); 873 spin_lock(&clp->cl_lock); 874 rcu_read_lock(); 875 return -EAGAIN; 876 } 877 return 0; 878 } 879 880 static int 881 pnfs_layout_free_bulk_destroy_list(struct list_head *layout_list, 882 enum pnfs_layout_destroy_mode mode) 883 { 884 struct pnfs_layout_hdr *lo; 885 struct inode *inode; 886 LIST_HEAD(lseg_list); 887 int ret = 0; 888 889 while (!list_empty(layout_list)) { 890 lo = list_entry(layout_list->next, struct pnfs_layout_hdr, 891 plh_bulk_destroy); 892 dprintk("%s freeing layout for inode %lu\n", __func__, 893 lo->plh_inode->i_ino); 894 inode = lo->plh_inode; 895 896 pnfs_layoutcommit_inode(inode, false); 897 898 spin_lock(&inode->i_lock); 899 list_del_init(&lo->plh_bulk_destroy); 900 if (mode == PNFS_LAYOUT_FILE_BULK_RETURN) { 901 pnfs_mark_layout_stateid_return(lo, &lseg_list, 902 IOMODE_ANY, 0); 903 } else if (pnfs_mark_layout_stateid_invalid(lo, &lseg_list)) { 904 if (mode == PNFS_LAYOUT_BULK_RETURN) 905 set_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 906 ret = -EAGAIN; 907 } 908 spin_unlock(&inode->i_lock); 909 pnfs_free_lseg_list(&lseg_list); 910 /* Free all lsegs that are attached to commit buckets */ 911 nfs_commit_inode(inode, 0); 912 pnfs_put_layout_hdr(lo); 913 nfs_iput_and_deactive(inode); 914 } 915 return ret; 916 } 917 918 int pnfs_layout_destroy_byfsid(struct nfs_client *clp, struct nfs_fsid *fsid, 919 enum pnfs_layout_destroy_mode mode) 920 { 921 struct nfs_server *server; 922 LIST_HEAD(layout_list); 923 924 spin_lock(&clp->cl_lock); 925 rcu_read_lock(); 926 restart: 927 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 928 if (memcmp(&server->fsid, fsid, sizeof(*fsid)) != 0) 929 continue; 930 if (pnfs_layout_bulk_destroy_byserver_locked(clp, 931 server, 932 &layout_list) != 0) 933 goto restart; 934 } 935 rcu_read_unlock(); 936 spin_unlock(&clp->cl_lock); 937 938 return pnfs_layout_free_bulk_destroy_list(&layout_list, mode); 939 } 940 941 static void pnfs_layout_build_destroy_list_byclient(struct nfs_client *clp, 942 struct list_head *list) 943 { 944 struct nfs_server *server; 945 946 spin_lock(&clp->cl_lock); 947 rcu_read_lock(); 948 restart: 949 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 950 if (pnfs_layout_bulk_destroy_byserver_locked(clp, server, 951 list) != 0) 952 goto restart; 953 } 954 rcu_read_unlock(); 955 spin_unlock(&clp->cl_lock); 956 } 957 958 static int pnfs_layout_do_destroy_byclid(struct nfs_client *clp, 959 struct list_head *list, 960 enum pnfs_layout_destroy_mode mode) 961 { 962 pnfs_layout_build_destroy_list_byclient(clp, list); 963 return pnfs_layout_free_bulk_destroy_list(list, mode); 964 } 965 966 int pnfs_layout_destroy_byclid(struct nfs_client *clp, 967 enum pnfs_layout_destroy_mode mode) 968 { 969 LIST_HEAD(layout_list); 970 971 return pnfs_layout_do_destroy_byclid(clp, &layout_list, mode); 972 } 973 974 /* 975 * Called by the state manager to remove all layouts established under an 976 * expired lease. 977 */ 978 void 979 pnfs_destroy_all_layouts(struct nfs_client *clp) 980 { 981 nfs4_deviceid_mark_client_invalid(clp); 982 nfs4_deviceid_purge_client(clp); 983 984 pnfs_layout_destroy_byclid(clp, PNFS_LAYOUT_INVALIDATE); 985 } 986 987 static void pnfs_layout_build_recover_list_byclient(struct nfs_client *clp, 988 struct list_head *list) 989 { 990 struct nfs_server *server; 991 992 spin_lock(&clp->cl_lock); 993 rcu_read_lock(); 994 restart: 995 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { 996 if (!(server->caps & NFS_CAP_REBOOT_LAYOUTRETURN)) 997 continue; 998 if (pnfs_layout_bulk_destroy_byserver_locked(clp, server, 999 list) != 0) 1000 goto restart; 1001 } 1002 rcu_read_unlock(); 1003 spin_unlock(&clp->cl_lock); 1004 } 1005 1006 static int pnfs_layout_bulk_list_reboot(struct list_head *list) 1007 { 1008 struct pnfs_layout_hdr *lo; 1009 struct nfs_server *server; 1010 int ret; 1011 1012 list_for_each_entry(lo, list, plh_bulk_destroy) { 1013 server = NFS_SERVER(lo->plh_inode); 1014 ret = pnfs_layout_return_on_reboot(lo); 1015 switch (ret) { 1016 case 0: 1017 continue; 1018 case -NFS4ERR_BAD_STATEID: 1019 server->caps &= ~NFS_CAP_REBOOT_LAYOUTRETURN; 1020 break; 1021 case -NFS4ERR_NO_GRACE: 1022 break; 1023 default: 1024 goto err; 1025 } 1026 break; 1027 } 1028 return 0; 1029 err: 1030 return ret; 1031 } 1032 1033 int pnfs_layout_handle_reboot(struct nfs_client *clp) 1034 { 1035 LIST_HEAD(list); 1036 int ret = 0, ret2; 1037 1038 pnfs_layout_build_recover_list_byclient(clp, &list); 1039 if (!list_empty(&list)) 1040 ret = pnfs_layout_bulk_list_reboot(&list); 1041 ret2 = pnfs_layout_do_destroy_byclid(clp, &list, 1042 PNFS_LAYOUT_INVALIDATE); 1043 if (!ret) 1044 ret = ret2; 1045 return (ret == 0) ? 0 : -EAGAIN; 1046 } 1047 1048 static void 1049 pnfs_set_layout_cred(struct pnfs_layout_hdr *lo, const struct cred *cred) 1050 { 1051 const struct cred *old; 1052 1053 if (cred && cred_fscmp(lo->plh_lc_cred, cred) != 0) { 1054 old = xchg(&lo->plh_lc_cred, get_cred(cred)); 1055 put_cred(old); 1056 } 1057 } 1058 1059 /* update lo->plh_stateid with new if is more recent */ 1060 void 1061 pnfs_set_layout_stateid(struct pnfs_layout_hdr *lo, const nfs4_stateid *new, 1062 const struct cred *cred, bool update_barrier) 1063 { 1064 u32 oldseq = be32_to_cpu(lo->plh_stateid.seqid); 1065 u32 newseq = be32_to_cpu(new->seqid); 1066 1067 if (!pnfs_layout_is_valid(lo)) { 1068 pnfs_set_layout_cred(lo, cred); 1069 nfs4_stateid_copy(&lo->plh_stateid, new); 1070 lo->plh_barrier = newseq; 1071 pnfs_clear_layoutreturn_info(lo); 1072 clear_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags); 1073 return; 1074 } 1075 1076 if (pnfs_seqid_is_newer(newseq, oldseq)) 1077 nfs4_stateid_copy(&lo->plh_stateid, new); 1078 1079 if (update_barrier) { 1080 pnfs_barrier_update(lo, newseq); 1081 return; 1082 } 1083 /* 1084 * Because of wraparound, we want to keep the barrier 1085 * "close" to the current seqids. We really only want to 1086 * get here from a layoutget call. 1087 */ 1088 if (atomic_read(&lo->plh_outstanding) == 1) 1089 pnfs_barrier_update(lo, be32_to_cpu(lo->plh_stateid.seqid)); 1090 } 1091 1092 static bool 1093 pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo, 1094 const nfs4_stateid *stateid) 1095 { 1096 u32 seqid = be32_to_cpu(stateid->seqid); 1097 1098 return lo->plh_barrier && pnfs_seqid_is_newer(lo->plh_barrier, seqid); 1099 } 1100 1101 /* lget is set to 1 if called from inside send_layoutget call chain */ 1102 static bool 1103 pnfs_layoutgets_blocked(const struct pnfs_layout_hdr *lo) 1104 { 1105 return lo->plh_block_lgets || 1106 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags); 1107 } 1108 1109 static struct nfs_server * 1110 pnfs_find_server(struct inode *inode, struct nfs_open_context *ctx) 1111 { 1112 struct nfs_server *server; 1113 1114 if (inode) { 1115 server = NFS_SERVER(inode); 1116 } else { 1117 struct dentry *parent_dir = dget_parent(ctx->dentry); 1118 server = NFS_SERVER(parent_dir->d_inode); 1119 dput(parent_dir); 1120 } 1121 return server; 1122 } 1123 1124 static void nfs4_free_pages(struct page **pages, size_t size) 1125 { 1126 int i; 1127 1128 if (!pages) 1129 return; 1130 1131 for (i = 0; i < size; i++) { 1132 if (!pages[i]) 1133 break; 1134 __free_page(pages[i]); 1135 } 1136 kfree(pages); 1137 } 1138 1139 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags) 1140 { 1141 struct page **pages; 1142 int i; 1143 1144 pages = kmalloc_array(size, sizeof(struct page *), gfp_flags); 1145 if (!pages) { 1146 dprintk("%s: can't alloc array of %zu pages\n", __func__, size); 1147 return NULL; 1148 } 1149 1150 for (i = 0; i < size; i++) { 1151 pages[i] = alloc_page(gfp_flags); 1152 if (!pages[i]) { 1153 dprintk("%s: failed to allocate page\n", __func__); 1154 nfs4_free_pages(pages, i); 1155 return NULL; 1156 } 1157 } 1158 1159 return pages; 1160 } 1161 1162 static struct nfs4_layoutget * 1163 pnfs_alloc_init_layoutget_args(struct inode *ino, 1164 struct nfs_open_context *ctx, 1165 const nfs4_stateid *stateid, 1166 const struct pnfs_layout_range *range, 1167 gfp_t gfp_flags) 1168 { 1169 struct nfs_server *server = pnfs_find_server(ino, ctx); 1170 size_t max_reply_sz = server->pnfs_curr_ld->max_layoutget_response; 1171 size_t max_pages = max_response_pages(server); 1172 struct nfs4_layoutget *lgp; 1173 1174 dprintk("--> %s\n", __func__); 1175 1176 lgp = kzalloc(sizeof(*lgp), gfp_flags); 1177 if (lgp == NULL) 1178 return NULL; 1179 1180 if (max_reply_sz) { 1181 size_t npages = (max_reply_sz + PAGE_SIZE - 1) >> PAGE_SHIFT; 1182 if (npages < max_pages) 1183 max_pages = npages; 1184 } 1185 1186 lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags); 1187 if (!lgp->args.layout.pages) { 1188 kfree(lgp); 1189 return NULL; 1190 } 1191 lgp->args.layout.pglen = max_pages * PAGE_SIZE; 1192 lgp->res.layoutp = &lgp->args.layout; 1193 1194 /* Don't confuse uninitialised result and success */ 1195 lgp->res.status = -NFS4ERR_DELAY; 1196 1197 lgp->args.minlength = PAGE_SIZE; 1198 if (lgp->args.minlength > range->length) 1199 lgp->args.minlength = range->length; 1200 if (ino) { 1201 loff_t i_size = i_size_read(ino); 1202 1203 if (range->iomode == IOMODE_READ) { 1204 if (range->offset >= i_size) 1205 lgp->args.minlength = 0; 1206 else if (i_size - range->offset < lgp->args.minlength) 1207 lgp->args.minlength = i_size - range->offset; 1208 } 1209 } 1210 lgp->args.maxcount = PNFS_LAYOUT_MAXSIZE; 1211 pnfs_copy_range(&lgp->args.range, range); 1212 lgp->args.type = server->pnfs_curr_ld->id; 1213 lgp->args.inode = ino; 1214 lgp->args.ctx = get_nfs_open_context(ctx); 1215 nfs4_stateid_copy(&lgp->args.stateid, stateid); 1216 lgp->gfp_flags = gfp_flags; 1217 lgp->cred = ctx->cred; 1218 return lgp; 1219 } 1220 1221 void pnfs_layoutget_free(struct nfs4_layoutget *lgp) 1222 { 1223 size_t max_pages = lgp->args.layout.pglen / PAGE_SIZE; 1224 1225 nfs4_free_pages(lgp->args.layout.pages, max_pages); 1226 pnfs_put_layout_hdr(lgp->lo); 1227 put_nfs_open_context(lgp->args.ctx); 1228 kfree(lgp); 1229 } 1230 1231 static void pnfs_clear_layoutcommit(struct inode *inode, 1232 struct list_head *head) 1233 { 1234 struct nfs_inode *nfsi = NFS_I(inode); 1235 struct pnfs_layout_segment *lseg, *tmp; 1236 1237 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 1238 return; 1239 list_for_each_entry_safe(lseg, tmp, &nfsi->layout->plh_segs, pls_list) { 1240 if (!test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 1241 continue; 1242 pnfs_lseg_dec_and_remove_zero(lseg, head); 1243 } 1244 } 1245 1246 static void 1247 pnfs_layoutreturn_retry_later_locked(struct pnfs_layout_hdr *lo, 1248 const nfs4_stateid *arg_stateid, 1249 const struct pnfs_layout_range *range) 1250 { 1251 const struct pnfs_layout_segment *lseg; 1252 u32 seq = be32_to_cpu(arg_stateid->seqid); 1253 1254 if (pnfs_layout_is_valid(lo) && 1255 nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) { 1256 list_for_each_entry(lseg, &lo->plh_return_segs, pls_list) { 1257 if (pnfs_seqid_is_newer(lseg->pls_seq, seq) || 1258 !pnfs_should_free_range(&lseg->pls_range, range)) 1259 continue; 1260 pnfs_set_plh_return_info(lo, range->iomode, seq); 1261 break; 1262 } 1263 } 1264 } 1265 1266 void pnfs_layoutreturn_retry_later(struct pnfs_layout_hdr *lo, 1267 const nfs4_stateid *arg_stateid, 1268 const struct pnfs_layout_range *range) 1269 { 1270 struct inode *inode = lo->plh_inode; 1271 1272 spin_lock(&inode->i_lock); 1273 pnfs_layoutreturn_retry_later_locked(lo, arg_stateid, range); 1274 pnfs_clear_layoutreturn_waitbit(lo); 1275 spin_unlock(&inode->i_lock); 1276 } 1277 1278 void pnfs_layoutreturn_free_lsegs(struct pnfs_layout_hdr *lo, 1279 const nfs4_stateid *arg_stateid, 1280 const struct pnfs_layout_range *range, 1281 const nfs4_stateid *stateid) 1282 { 1283 struct inode *inode = lo->plh_inode; 1284 LIST_HEAD(freeme); 1285 1286 spin_lock(&inode->i_lock); 1287 if (!nfs4_stateid_match_other(&lo->plh_stateid, arg_stateid)) 1288 goto out_unlock; 1289 if (stateid && pnfs_layout_is_valid(lo)) { 1290 u32 seq = be32_to_cpu(arg_stateid->seqid); 1291 1292 pnfs_mark_matching_lsegs_invalid(lo, &freeme, range, seq); 1293 pnfs_free_returned_lsegs(lo, &freeme, range, seq); 1294 pnfs_set_layout_stateid(lo, stateid, NULL, true); 1295 } else 1296 pnfs_mark_layout_stateid_invalid(lo, &freeme); 1297 out_unlock: 1298 pnfs_clear_layoutreturn_waitbit(lo); 1299 spin_unlock(&inode->i_lock); 1300 pnfs_free_lseg_list(&freeme); 1301 1302 } 1303 1304 static bool 1305 pnfs_prepare_layoutreturn(struct pnfs_layout_hdr *lo, 1306 nfs4_stateid *stateid, 1307 const struct cred **cred, 1308 enum pnfs_iomode *iomode) 1309 { 1310 /* Serialise LAYOUTGET/LAYOUTRETURN */ 1311 if (atomic_read(&lo->plh_outstanding) != 0) 1312 return false; 1313 if (test_and_set_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) 1314 return false; 1315 set_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 1316 pnfs_get_layout_hdr(lo); 1317 nfs4_stateid_copy(stateid, &lo->plh_stateid); 1318 *cred = get_cred(lo->plh_lc_cred); 1319 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) { 1320 if (lo->plh_return_seq != 0) 1321 stateid->seqid = cpu_to_be32(lo->plh_return_seq); 1322 if (iomode != NULL) 1323 *iomode = lo->plh_return_iomode; 1324 pnfs_clear_layoutreturn_info(lo); 1325 } else if (iomode != NULL) 1326 *iomode = IOMODE_ANY; 1327 pnfs_barrier_update(lo, be32_to_cpu(stateid->seqid)); 1328 return true; 1329 } 1330 1331 static void 1332 pnfs_init_layoutreturn_args(struct nfs4_layoutreturn_args *args, 1333 struct pnfs_layout_hdr *lo, 1334 const nfs4_stateid *stateid, 1335 enum pnfs_iomode iomode) 1336 { 1337 struct inode *inode = lo->plh_inode; 1338 1339 args->layout_type = NFS_SERVER(inode)->pnfs_curr_ld->id; 1340 args->inode = inode; 1341 args->range.iomode = iomode; 1342 args->range.offset = 0; 1343 args->range.length = NFS4_MAX_UINT64; 1344 args->layout = lo; 1345 nfs4_stateid_copy(&args->stateid, stateid); 1346 } 1347 1348 static int 1349 pnfs_send_layoutreturn(struct pnfs_layout_hdr *lo, 1350 const nfs4_stateid *stateid, 1351 const struct cred **pcred, 1352 enum pnfs_iomode iomode, 1353 unsigned int flags) 1354 { 1355 struct inode *ino = lo->plh_inode; 1356 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1357 struct nfs4_layoutreturn *lrp; 1358 const struct cred *cred = *pcred; 1359 int status = 0; 1360 1361 *pcred = NULL; 1362 lrp = kzalloc(sizeof(*lrp), nfs_io_gfp_mask()); 1363 if (unlikely(lrp == NULL)) { 1364 status = -ENOMEM; 1365 spin_lock(&ino->i_lock); 1366 pnfs_clear_layoutreturn_waitbit(lo); 1367 spin_unlock(&ino->i_lock); 1368 put_cred(cred); 1369 pnfs_put_layout_hdr(lo); 1370 goto out; 1371 } 1372 1373 pnfs_init_layoutreturn_args(&lrp->args, lo, stateid, iomode); 1374 lrp->args.ld_private = &lrp->ld_private; 1375 lrp->clp = NFS_SERVER(ino)->nfs_client; 1376 lrp->cred = cred; 1377 if (ld->prepare_layoutreturn) 1378 ld->prepare_layoutreturn(&lrp->args); 1379 1380 status = nfs4_proc_layoutreturn(lrp, flags); 1381 out: 1382 dprintk("<-- %s status: %d\n", __func__, status); 1383 return status; 1384 } 1385 1386 /* Return true if layoutreturn is needed */ 1387 static bool 1388 pnfs_layout_need_return(struct pnfs_layout_hdr *lo) 1389 { 1390 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1391 return false; 1392 return pnfs_mark_layout_stateid_return(lo, &lo->plh_return_segs, 1393 lo->plh_return_iomode, 1394 lo->plh_return_seq) != EBUSY; 1395 } 1396 1397 static void pnfs_layoutreturn_before_put_layout_hdr(struct pnfs_layout_hdr *lo) 1398 { 1399 struct inode *inode= lo->plh_inode; 1400 1401 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1402 return; 1403 spin_lock(&inode->i_lock); 1404 if (pnfs_layout_need_return(lo)) { 1405 const struct cred *cred; 1406 nfs4_stateid stateid; 1407 enum pnfs_iomode iomode; 1408 bool send; 1409 1410 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); 1411 spin_unlock(&inode->i_lock); 1412 if (send) { 1413 /* Send an async layoutreturn so we dont deadlock */ 1414 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, 1415 PNFS_FL_LAYOUTRETURN_ASYNC); 1416 } 1417 } else 1418 spin_unlock(&inode->i_lock); 1419 } 1420 1421 /* 1422 * Initiates a LAYOUTRETURN(FILE), and removes the pnfs_layout_hdr 1423 * when the layout segment list is empty. 1424 * 1425 * Note that a pnfs_layout_hdr can exist with an empty layout segment 1426 * list when LAYOUTGET has failed, or when LAYOUTGET succeeded, but the 1427 * deviceid is marked invalid. 1428 */ 1429 int 1430 _pnfs_return_layout(struct inode *ino) 1431 { 1432 struct pnfs_layout_hdr *lo = NULL; 1433 struct nfs_inode *nfsi = NFS_I(ino); 1434 struct pnfs_layout_range range = { 1435 .iomode = IOMODE_ANY, 1436 .offset = 0, 1437 .length = NFS4_MAX_UINT64, 1438 }; 1439 LIST_HEAD(tmp_list); 1440 const struct cred *cred; 1441 nfs4_stateid stateid; 1442 int status = 0; 1443 bool send, valid_layout; 1444 1445 dprintk("NFS: %s for inode %lu\n", __func__, ino->i_ino); 1446 1447 spin_lock(&ino->i_lock); 1448 lo = nfsi->layout; 1449 if (!lo) { 1450 spin_unlock(&ino->i_lock); 1451 dprintk("NFS: %s no layout to return\n", __func__); 1452 goto out; 1453 } 1454 /* Reference matched in nfs4_layoutreturn_release */ 1455 pnfs_get_layout_hdr(lo); 1456 /* Is there an outstanding layoutreturn ? */ 1457 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1458 spin_unlock(&ino->i_lock); 1459 if (wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1460 TASK_UNINTERRUPTIBLE)) 1461 goto out_put_layout_hdr; 1462 spin_lock(&ino->i_lock); 1463 } 1464 valid_layout = pnfs_layout_is_valid(lo); 1465 pnfs_clear_layoutcommit(ino, &tmp_list); 1466 pnfs_mark_matching_lsegs_return(lo, &tmp_list, &range, 0); 1467 1468 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) 1469 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo, &range); 1470 1471 /* Don't send a LAYOUTRETURN if list was initially empty */ 1472 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags) || 1473 !valid_layout) { 1474 spin_unlock(&ino->i_lock); 1475 dprintk("NFS: %s no layout segments to return\n", __func__); 1476 goto out_wait_layoutreturn; 1477 } 1478 1479 send = pnfs_prepare_layoutreturn(lo, &stateid, &cred, NULL); 1480 spin_unlock(&ino->i_lock); 1481 if (send) 1482 status = pnfs_send_layoutreturn(lo, &stateid, &cred, IOMODE_ANY, 1483 0); 1484 out_wait_layoutreturn: 1485 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, TASK_UNINTERRUPTIBLE); 1486 out_put_layout_hdr: 1487 pnfs_free_lseg_list(&tmp_list); 1488 pnfs_put_layout_hdr(lo); 1489 out: 1490 dprintk("<-- %s status: %d\n", __func__, status); 1491 return status; 1492 } 1493 1494 int 1495 pnfs_commit_and_return_layout(struct inode *inode) 1496 { 1497 struct pnfs_layout_hdr *lo; 1498 int ret; 1499 1500 spin_lock(&inode->i_lock); 1501 lo = NFS_I(inode)->layout; 1502 if (lo == NULL) { 1503 spin_unlock(&inode->i_lock); 1504 return 0; 1505 } 1506 pnfs_get_layout_hdr(lo); 1507 /* Block new layoutgets and read/write to ds */ 1508 lo->plh_block_lgets++; 1509 spin_unlock(&inode->i_lock); 1510 filemap_fdatawait(inode->i_mapping); 1511 ret = pnfs_layoutcommit_inode(inode, true); 1512 if (ret == 0) 1513 ret = _pnfs_return_layout(inode); 1514 spin_lock(&inode->i_lock); 1515 lo->plh_block_lgets--; 1516 spin_unlock(&inode->i_lock); 1517 pnfs_put_layout_hdr(lo); 1518 return ret; 1519 } 1520 1521 static int pnfs_layout_return_on_reboot(struct pnfs_layout_hdr *lo) 1522 { 1523 struct inode *inode = lo->plh_inode; 1524 const struct cred *cred; 1525 1526 spin_lock(&inode->i_lock); 1527 if (!pnfs_layout_is_valid(lo)) { 1528 spin_unlock(&inode->i_lock); 1529 return 0; 1530 } 1531 cred = get_cred(lo->plh_lc_cred); 1532 pnfs_get_layout_hdr(lo); 1533 spin_unlock(&inode->i_lock); 1534 1535 return pnfs_send_layoutreturn(lo, &zero_stateid, &cred, IOMODE_ANY, 1536 PNFS_FL_LAYOUTRETURN_PRIVILEGED); 1537 } 1538 1539 bool pnfs_roc(struct inode *ino, 1540 struct nfs4_layoutreturn_args *args, 1541 struct nfs4_layoutreturn_res *res, 1542 const struct cred *cred) 1543 { 1544 struct nfs_inode *nfsi = NFS_I(ino); 1545 struct nfs_open_context *ctx; 1546 struct nfs4_state *state; 1547 struct pnfs_layout_hdr *lo; 1548 struct pnfs_layout_segment *lseg, *next; 1549 const struct cred *lc_cred; 1550 nfs4_stateid stateid; 1551 enum pnfs_iomode iomode = 0; 1552 bool layoutreturn = false, roc = false; 1553 bool skip_read = false; 1554 1555 if (!nfs_have_layout(ino)) 1556 return false; 1557 retry: 1558 rcu_read_lock(); 1559 spin_lock(&ino->i_lock); 1560 lo = nfsi->layout; 1561 if (!lo || !pnfs_layout_is_valid(lo) || 1562 test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 1563 lo = NULL; 1564 goto out_noroc; 1565 } 1566 pnfs_get_layout_hdr(lo); 1567 if (test_bit(NFS_LAYOUT_RETURN_LOCK, &lo->plh_flags)) { 1568 spin_unlock(&ino->i_lock); 1569 rcu_read_unlock(); 1570 wait_on_bit(&lo->plh_flags, NFS_LAYOUT_RETURN, 1571 TASK_UNINTERRUPTIBLE); 1572 pnfs_put_layout_hdr(lo); 1573 goto retry; 1574 } 1575 1576 /* no roc if we hold a delegation */ 1577 if (nfs4_check_delegation(ino, FMODE_READ)) { 1578 if (nfs4_check_delegation(ino, FMODE_WRITE)) 1579 goto out_noroc; 1580 skip_read = true; 1581 } 1582 1583 list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { 1584 state = ctx->state; 1585 if (state == NULL) 1586 continue; 1587 /* Don't return layout if there is open file state */ 1588 if (state->state & FMODE_WRITE) 1589 goto out_noroc; 1590 if (state->state & FMODE_READ) 1591 skip_read = true; 1592 } 1593 1594 1595 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) { 1596 if (skip_read && lseg->pls_range.iomode == IOMODE_READ) 1597 continue; 1598 /* If we are sending layoutreturn, invalidate all valid lsegs */ 1599 if (!test_and_clear_bit(NFS_LSEG_ROC, &lseg->pls_flags)) 1600 continue; 1601 /* 1602 * Note: mark lseg for return so pnfs_layout_remove_lseg 1603 * doesn't invalidate the layout for us. 1604 */ 1605 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 1606 if (!mark_lseg_invalid(lseg, &lo->plh_return_segs)) 1607 continue; 1608 pnfs_set_plh_return_info(lo, lseg->pls_range.iomode, 0); 1609 } 1610 1611 if (!test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 1612 goto out_noroc; 1613 1614 /* ROC in two conditions: 1615 * 1. there are ROC lsegs 1616 * 2. we don't send layoutreturn 1617 */ 1618 /* lo ref dropped in pnfs_roc_release() */ 1619 layoutreturn = pnfs_prepare_layoutreturn(lo, &stateid, &lc_cred, &iomode); 1620 /* If the creds don't match, we can't compound the layoutreturn */ 1621 if (!layoutreturn || cred_fscmp(cred, lc_cred) != 0) 1622 goto out_noroc; 1623 1624 roc = layoutreturn; 1625 pnfs_init_layoutreturn_args(args, lo, &stateid, iomode); 1626 res->lrs_present = 0; 1627 layoutreturn = false; 1628 put_cred(lc_cred); 1629 1630 out_noroc: 1631 spin_unlock(&ino->i_lock); 1632 rcu_read_unlock(); 1633 pnfs_layoutcommit_inode(ino, true); 1634 if (roc) { 1635 struct pnfs_layoutdriver_type *ld = NFS_SERVER(ino)->pnfs_curr_ld; 1636 if (ld->prepare_layoutreturn) 1637 ld->prepare_layoutreturn(args); 1638 pnfs_put_layout_hdr(lo); 1639 return true; 1640 } 1641 if (layoutreturn) 1642 pnfs_send_layoutreturn(lo, &stateid, &lc_cred, iomode, 0); 1643 pnfs_put_layout_hdr(lo); 1644 return false; 1645 } 1646 1647 int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp, 1648 struct nfs4_layoutreturn_res **respp, int *ret) 1649 { 1650 struct nfs4_layoutreturn_args *arg = *argpp; 1651 int retval = -EAGAIN; 1652 1653 if (!arg) 1654 return 0; 1655 /* Handle Layoutreturn errors */ 1656 switch (*ret) { 1657 case 0: 1658 retval = 0; 1659 break; 1660 case -NFS4ERR_NOMATCHING_LAYOUT: 1661 /* Was there an RPC level error? If not, retry */ 1662 if (task->tk_rpc_status == 0) 1663 break; 1664 /* If the call was not sent, let caller handle it */ 1665 if (!RPC_WAS_SENT(task)) 1666 return 0; 1667 /* 1668 * Otherwise, assume the call succeeded and 1669 * that we need to release the layout 1670 */ 1671 *ret = 0; 1672 (*respp)->lrs_present = 0; 1673 retval = 0; 1674 break; 1675 case -NFS4ERR_DELAY: 1676 /* Let the caller handle the retry */ 1677 *ret = -NFS4ERR_NOMATCHING_LAYOUT; 1678 return 0; 1679 case -NFS4ERR_OLD_STATEID: 1680 if (!nfs4_layout_refresh_old_stateid(&arg->stateid, 1681 &arg->range, arg->inode)) 1682 break; 1683 *ret = -NFS4ERR_NOMATCHING_LAYOUT; 1684 return -EAGAIN; 1685 } 1686 *argpp = NULL; 1687 *respp = NULL; 1688 return retval; 1689 } 1690 1691 void pnfs_roc_release(struct nfs4_layoutreturn_args *args, 1692 struct nfs4_layoutreturn_res *res, int ret) 1693 { 1694 struct pnfs_layout_hdr *lo = args->layout; 1695 struct inode *inode = args->inode; 1696 const nfs4_stateid *res_stateid = NULL; 1697 struct nfs4_xdr_opaque_data *ld_private = args->ld_private; 1698 1699 switch (ret) { 1700 case -NFS4ERR_BADSESSION: 1701 case -NFS4ERR_DEADSESSION: 1702 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: 1703 case -NFS4ERR_NOMATCHING_LAYOUT: 1704 spin_lock(&inode->i_lock); 1705 pnfs_layoutreturn_retry_later_locked(lo, &args->stateid, 1706 &args->range); 1707 pnfs_clear_layoutreturn_waitbit(lo); 1708 spin_unlock(&inode->i_lock); 1709 break; 1710 case 0: 1711 if (res->lrs_present) 1712 res_stateid = &res->stateid; 1713 fallthrough; 1714 default: 1715 pnfs_layoutreturn_free_lsegs(lo, &args->stateid, &args->range, 1716 res_stateid); 1717 } 1718 trace_nfs4_layoutreturn_on_close(args->inode, &args->stateid, ret); 1719 if (ld_private && ld_private->ops && ld_private->ops->free) 1720 ld_private->ops->free(ld_private); 1721 pnfs_put_layout_hdr(lo); 1722 } 1723 1724 bool pnfs_wait_on_layoutreturn(struct inode *ino, struct rpc_task *task) 1725 { 1726 struct nfs_inode *nfsi = NFS_I(ino); 1727 struct pnfs_layout_hdr *lo; 1728 bool sleep = false; 1729 1730 /* we might not have grabbed lo reference. so need to check under 1731 * i_lock */ 1732 spin_lock(&ino->i_lock); 1733 lo = nfsi->layout; 1734 if (lo && test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 1735 rpc_sleep_on(&NFS_SERVER(ino)->roc_rpcwaitq, task, NULL); 1736 sleep = true; 1737 } 1738 spin_unlock(&ino->i_lock); 1739 return sleep; 1740 } 1741 1742 /* 1743 * Compare two layout segments for sorting into layout cache. 1744 * We want to preferentially return RW over RO layouts, so ensure those 1745 * are seen first. 1746 */ 1747 static s64 1748 pnfs_lseg_range_cmp(const struct pnfs_layout_range *l1, 1749 const struct pnfs_layout_range *l2) 1750 { 1751 s64 d; 1752 1753 /* high offset > low offset */ 1754 d = l1->offset - l2->offset; 1755 if (d) 1756 return d; 1757 1758 /* short length > long length */ 1759 d = l2->length - l1->length; 1760 if (d) 1761 return d; 1762 1763 /* read > read/write */ 1764 return (int)(l1->iomode == IOMODE_READ) - (int)(l2->iomode == IOMODE_READ); 1765 } 1766 1767 static bool 1768 pnfs_lseg_range_is_after(const struct pnfs_layout_range *l1, 1769 const struct pnfs_layout_range *l2) 1770 { 1771 return pnfs_lseg_range_cmp(l1, l2) > 0; 1772 } 1773 1774 static bool 1775 pnfs_lseg_no_merge(struct pnfs_layout_segment *lseg, 1776 struct pnfs_layout_segment *old) 1777 { 1778 return false; 1779 } 1780 1781 void 1782 pnfs_generic_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1783 struct pnfs_layout_segment *lseg, 1784 bool (*is_after)(const struct pnfs_layout_range *, 1785 const struct pnfs_layout_range *), 1786 bool (*do_merge)(struct pnfs_layout_segment *, 1787 struct pnfs_layout_segment *), 1788 struct list_head *free_me) 1789 { 1790 struct pnfs_layout_segment *lp, *tmp; 1791 1792 dprintk("%s:Begin\n", __func__); 1793 1794 list_for_each_entry_safe(lp, tmp, &lo->plh_segs, pls_list) { 1795 if (test_bit(NFS_LSEG_VALID, &lp->pls_flags) == 0) 1796 continue; 1797 if (do_merge(lseg, lp)) { 1798 mark_lseg_invalid(lp, free_me); 1799 continue; 1800 } 1801 if (is_after(&lseg->pls_range, &lp->pls_range)) 1802 continue; 1803 list_add_tail(&lseg->pls_list, &lp->pls_list); 1804 dprintk("%s: inserted lseg %p " 1805 "iomode %d offset %llu length %llu before " 1806 "lp %p iomode %d offset %llu length %llu\n", 1807 __func__, lseg, lseg->pls_range.iomode, 1808 lseg->pls_range.offset, lseg->pls_range.length, 1809 lp, lp->pls_range.iomode, lp->pls_range.offset, 1810 lp->pls_range.length); 1811 goto out; 1812 } 1813 list_add_tail(&lseg->pls_list, &lo->plh_segs); 1814 dprintk("%s: inserted lseg %p " 1815 "iomode %d offset %llu length %llu at tail\n", 1816 __func__, lseg, lseg->pls_range.iomode, 1817 lseg->pls_range.offset, lseg->pls_range.length); 1818 out: 1819 pnfs_get_layout_hdr(lo); 1820 1821 dprintk("%s:Return\n", __func__); 1822 } 1823 EXPORT_SYMBOL_GPL(pnfs_generic_layout_insert_lseg); 1824 1825 static void 1826 pnfs_layout_insert_lseg(struct pnfs_layout_hdr *lo, 1827 struct pnfs_layout_segment *lseg, 1828 struct list_head *free_me) 1829 { 1830 struct inode *inode = lo->plh_inode; 1831 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 1832 1833 if (ld->add_lseg != NULL) 1834 ld->add_lseg(lo, lseg, free_me); 1835 else 1836 pnfs_generic_layout_insert_lseg(lo, lseg, 1837 pnfs_lseg_range_is_after, 1838 pnfs_lseg_no_merge, 1839 free_me); 1840 } 1841 1842 static struct pnfs_layout_hdr * 1843 alloc_init_layout_hdr(struct inode *ino, 1844 struct nfs_open_context *ctx, 1845 gfp_t gfp_flags) 1846 { 1847 struct pnfs_layout_hdr *lo; 1848 1849 lo = pnfs_alloc_layout_hdr(ino, gfp_flags); 1850 if (!lo) 1851 return NULL; 1852 refcount_set(&lo->plh_refcount, 1); 1853 INIT_LIST_HEAD(&lo->plh_layouts); 1854 INIT_LIST_HEAD(&lo->plh_segs); 1855 INIT_LIST_HEAD(&lo->plh_return_segs); 1856 INIT_LIST_HEAD(&lo->plh_bulk_destroy); 1857 lo->plh_inode = ino; 1858 lo->plh_lc_cred = get_cred(ctx->cred); 1859 lo->plh_flags |= 1 << NFS_LAYOUT_INVALID_STID; 1860 return lo; 1861 } 1862 1863 static struct pnfs_layout_hdr * 1864 pnfs_find_alloc_layout(struct inode *ino, 1865 struct nfs_open_context *ctx, 1866 gfp_t gfp_flags) 1867 __releases(&ino->i_lock) 1868 __acquires(&ino->i_lock) 1869 { 1870 struct nfs_inode *nfsi = NFS_I(ino); 1871 struct pnfs_layout_hdr *new = NULL; 1872 1873 dprintk("%s Begin ino=%p layout=%p\n", __func__, ino, nfsi->layout); 1874 1875 if (nfsi->layout != NULL) 1876 goto out_existing; 1877 spin_unlock(&ino->i_lock); 1878 new = alloc_init_layout_hdr(ino, ctx, gfp_flags); 1879 spin_lock(&ino->i_lock); 1880 1881 if (likely(nfsi->layout == NULL)) { /* Won the race? */ 1882 nfsi->layout = new; 1883 return new; 1884 } else if (new != NULL) 1885 pnfs_free_layout_hdr(new); 1886 out_existing: 1887 pnfs_get_layout_hdr(nfsi->layout); 1888 return nfsi->layout; 1889 } 1890 1891 /* 1892 * iomode matching rules: 1893 * iomode lseg strict match 1894 * iomode 1895 * ----- ----- ------ ----- 1896 * ANY READ N/A true 1897 * ANY RW N/A true 1898 * RW READ N/A false 1899 * RW RW N/A true 1900 * READ READ N/A true 1901 * READ RW true false 1902 * READ RW false true 1903 */ 1904 static bool 1905 pnfs_lseg_range_match(const struct pnfs_layout_range *ls_range, 1906 const struct pnfs_layout_range *range, 1907 bool strict_iomode) 1908 { 1909 struct pnfs_layout_range range1; 1910 1911 if ((range->iomode == IOMODE_RW && 1912 ls_range->iomode != IOMODE_RW) || 1913 (range->iomode != ls_range->iomode && 1914 strict_iomode) || 1915 !pnfs_lseg_range_intersecting(ls_range, range)) 1916 return false; 1917 1918 /* range1 covers only the first byte in the range */ 1919 range1 = *range; 1920 range1.length = 1; 1921 return pnfs_lseg_range_contained(ls_range, &range1); 1922 } 1923 1924 /* 1925 * lookup range in layout 1926 */ 1927 static struct pnfs_layout_segment * 1928 pnfs_find_lseg(struct pnfs_layout_hdr *lo, 1929 struct pnfs_layout_range *range, 1930 bool strict_iomode) 1931 { 1932 struct pnfs_layout_segment *lseg, *ret = NULL; 1933 1934 dprintk("%s:Begin\n", __func__); 1935 1936 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 1937 if (test_bit(NFS_LSEG_VALID, &lseg->pls_flags) && 1938 pnfs_lseg_range_match(&lseg->pls_range, range, 1939 strict_iomode)) { 1940 ret = pnfs_get_lseg(lseg); 1941 break; 1942 } 1943 } 1944 1945 dprintk("%s:Return lseg %p ref %d\n", 1946 __func__, ret, ret ? refcount_read(&ret->pls_refcount) : 0); 1947 return ret; 1948 } 1949 1950 /* 1951 * Use mdsthreshold hints set at each OPEN to determine if I/O should go 1952 * to the MDS or over pNFS 1953 * 1954 * The nfs_inode read_io and write_io fields are cumulative counters reset 1955 * when there are no layout segments. Note that in pnfs_update_layout iomode 1956 * is set to IOMODE_READ for a READ request, and set to IOMODE_RW for a 1957 * WRITE request. 1958 * 1959 * A return of true means use MDS I/O. 1960 * 1961 * From rfc 5661: 1962 * If a file's size is smaller than the file size threshold, data accesses 1963 * SHOULD be sent to the metadata server. If an I/O request has a length that 1964 * is below the I/O size threshold, the I/O SHOULD be sent to the metadata 1965 * server. If both file size and I/O size are provided, the client SHOULD 1966 * reach or exceed both thresholds before sending its read or write 1967 * requests to the data server. 1968 */ 1969 static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, 1970 struct inode *ino, int iomode) 1971 { 1972 struct nfs4_threshold *t = ctx->mdsthreshold; 1973 struct nfs_inode *nfsi = NFS_I(ino); 1974 loff_t fsize = i_size_read(ino); 1975 bool size = false, size_set = false, io = false, io_set = false, ret = false; 1976 1977 if (t == NULL) 1978 return ret; 1979 1980 dprintk("%s bm=0x%x rd_sz=%llu wr_sz=%llu rd_io=%llu wr_io=%llu\n", 1981 __func__, t->bm, t->rd_sz, t->wr_sz, t->rd_io_sz, t->wr_io_sz); 1982 1983 switch (iomode) { 1984 case IOMODE_READ: 1985 if (t->bm & THRESHOLD_RD) { 1986 dprintk("%s fsize %llu\n", __func__, fsize); 1987 size_set = true; 1988 if (fsize < t->rd_sz) 1989 size = true; 1990 } 1991 if (t->bm & THRESHOLD_RD_IO) { 1992 dprintk("%s nfsi->read_io %llu\n", __func__, 1993 nfsi->read_io); 1994 io_set = true; 1995 if (nfsi->read_io < t->rd_io_sz) 1996 io = true; 1997 } 1998 break; 1999 case IOMODE_RW: 2000 if (t->bm & THRESHOLD_WR) { 2001 dprintk("%s fsize %llu\n", __func__, fsize); 2002 size_set = true; 2003 if (fsize < t->wr_sz) 2004 size = true; 2005 } 2006 if (t->bm & THRESHOLD_WR_IO) { 2007 dprintk("%s nfsi->write_io %llu\n", __func__, 2008 nfsi->write_io); 2009 io_set = true; 2010 if (nfsi->write_io < t->wr_io_sz) 2011 io = true; 2012 } 2013 break; 2014 } 2015 if (size_set && io_set) { 2016 if (size && io) 2017 ret = true; 2018 } else if (size || io) 2019 ret = true; 2020 2021 dprintk("<-- %s size %d io %d ret %d\n", __func__, size, io, ret); 2022 return ret; 2023 } 2024 2025 static int pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) 2026 { 2027 /* 2028 * send layoutcommit as it can hold up layoutreturn due to lseg 2029 * reference 2030 */ 2031 pnfs_layoutcommit_inode(lo->plh_inode, false); 2032 return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, 2033 nfs_wait_bit_killable, 2034 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 2035 } 2036 2037 static void nfs_layoutget_begin(struct pnfs_layout_hdr *lo) 2038 { 2039 atomic_inc(&lo->plh_outstanding); 2040 } 2041 2042 static void nfs_layoutget_end(struct pnfs_layout_hdr *lo) 2043 { 2044 if (atomic_dec_and_test(&lo->plh_outstanding) && 2045 test_and_clear_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags)) 2046 wake_up_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN); 2047 } 2048 2049 static bool pnfs_is_first_layoutget(struct pnfs_layout_hdr *lo) 2050 { 2051 return test_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags); 2052 } 2053 2054 static void pnfs_clear_first_layoutget(struct pnfs_layout_hdr *lo) 2055 { 2056 unsigned long *bitlock = &lo->plh_flags; 2057 2058 clear_bit_unlock(NFS_LAYOUT_FIRST_LAYOUTGET, bitlock); 2059 smp_mb__after_atomic(); 2060 wake_up_bit(bitlock, NFS_LAYOUT_FIRST_LAYOUTGET); 2061 } 2062 2063 static void _add_to_server_list(struct pnfs_layout_hdr *lo, 2064 struct nfs_server *server) 2065 { 2066 if (!test_and_set_bit(NFS_LAYOUT_HASHED, &lo->plh_flags)) { 2067 struct nfs_client *clp = server->nfs_client; 2068 2069 /* The lo must be on the clp list if there is any 2070 * chance of a CB_LAYOUTRECALL(FILE) coming in. 2071 */ 2072 spin_lock(&clp->cl_lock); 2073 list_add_tail_rcu(&lo->plh_layouts, &server->layouts); 2074 spin_unlock(&clp->cl_lock); 2075 } 2076 } 2077 2078 /* 2079 * Layout segment is retreived from the server if not cached. 2080 * The appropriate layout segment is referenced and returned to the caller. 2081 */ 2082 struct pnfs_layout_segment * 2083 pnfs_update_layout(struct inode *ino, 2084 struct nfs_open_context *ctx, 2085 loff_t pos, 2086 u64 count, 2087 enum pnfs_iomode iomode, 2088 bool strict_iomode, 2089 gfp_t gfp_flags) 2090 { 2091 struct pnfs_layout_range arg = { 2092 .iomode = iomode, 2093 .offset = pos, 2094 .length = count, 2095 }; 2096 unsigned pg_offset; 2097 struct nfs_server *server = NFS_SERVER(ino); 2098 struct nfs_client *clp = server->nfs_client; 2099 struct pnfs_layout_hdr *lo = NULL; 2100 struct pnfs_layout_segment *lseg = NULL; 2101 struct nfs4_layoutget *lgp; 2102 nfs4_stateid stateid; 2103 struct nfs4_exception exception = { 2104 .inode = ino, 2105 }; 2106 unsigned long giveup = jiffies + (clp->cl_lease_time << 1); 2107 bool first; 2108 2109 if (!pnfs_enabled_sb(NFS_SERVER(ino))) { 2110 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2111 PNFS_UPDATE_LAYOUT_NO_PNFS); 2112 goto out; 2113 } 2114 2115 if (pnfs_within_mdsthreshold(ctx, ino, iomode)) { 2116 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2117 PNFS_UPDATE_LAYOUT_MDSTHRESH); 2118 goto out; 2119 } 2120 2121 lookup_again: 2122 if (!nfs4_valid_open_stateid(ctx->state)) { 2123 trace_pnfs_update_layout(ino, pos, count, 2124 iomode, lo, lseg, 2125 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 2126 lseg = ERR_PTR(-EIO); 2127 goto out; 2128 } 2129 2130 lseg = ERR_PTR(nfs4_client_recover_expired_lease(clp)); 2131 if (IS_ERR(lseg)) 2132 goto out; 2133 first = false; 2134 spin_lock(&ino->i_lock); 2135 lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags); 2136 if (lo == NULL) { 2137 spin_unlock(&ino->i_lock); 2138 lseg = ERR_PTR(-ENOMEM); 2139 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2140 PNFS_UPDATE_LAYOUT_NOMEM); 2141 goto out; 2142 } 2143 2144 /* Do we even need to bother with this? */ 2145 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) { 2146 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2147 PNFS_UPDATE_LAYOUT_BULK_RECALL); 2148 dprintk("%s matches recall, use MDS\n", __func__); 2149 goto out_unlock; 2150 } 2151 2152 /* if LAYOUTGET already failed once we don't try again */ 2153 if (pnfs_layout_io_test_failed(lo, iomode)) { 2154 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2155 PNFS_UPDATE_LAYOUT_IO_TEST_FAIL); 2156 goto out_unlock; 2157 } 2158 2159 /* 2160 * If the layout segment list is empty, but there are outstanding 2161 * layoutget calls, then they might be subject to a layoutrecall. 2162 */ 2163 if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) && 2164 atomic_read(&lo->plh_outstanding) != 0) { 2165 spin_unlock(&ino->i_lock); 2166 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, NFS_LAYOUT_DRAIN, 2167 TASK_KILLABLE)); 2168 if (IS_ERR(lseg)) 2169 goto out_put_layout_hdr; 2170 pnfs_put_layout_hdr(lo); 2171 goto lookup_again; 2172 } 2173 2174 /* 2175 * Because we free lsegs when sending LAYOUTRETURN, we need to wait 2176 * for LAYOUTRETURN. 2177 */ 2178 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { 2179 spin_unlock(&ino->i_lock); 2180 dprintk("%s wait for layoutreturn\n", __func__); 2181 lseg = ERR_PTR(pnfs_prepare_to_retry_layoutget(lo)); 2182 if (!IS_ERR(lseg)) { 2183 pnfs_put_layout_hdr(lo); 2184 dprintk("%s retrying\n", __func__); 2185 trace_pnfs_update_layout(ino, pos, count, iomode, lo, 2186 lseg, 2187 PNFS_UPDATE_LAYOUT_RETRY); 2188 goto lookup_again; 2189 } 2190 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2191 PNFS_UPDATE_LAYOUT_RETURN); 2192 goto out_put_layout_hdr; 2193 } 2194 2195 lseg = pnfs_find_lseg(lo, &arg, strict_iomode); 2196 if (lseg) { 2197 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2198 PNFS_UPDATE_LAYOUT_FOUND_CACHED); 2199 goto out_unlock; 2200 } 2201 2202 /* 2203 * Choose a stateid for the LAYOUTGET. If we don't have a layout 2204 * stateid, or it has been invalidated, then we must use the open 2205 * stateid. 2206 */ 2207 if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) { 2208 int status; 2209 2210 /* 2211 * The first layoutget for the file. Need to serialize per 2212 * RFC 5661 Errata 3208. 2213 */ 2214 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, 2215 &lo->plh_flags)) { 2216 spin_unlock(&ino->i_lock); 2217 lseg = ERR_PTR(wait_on_bit(&lo->plh_flags, 2218 NFS_LAYOUT_FIRST_LAYOUTGET, 2219 TASK_KILLABLE)); 2220 if (IS_ERR(lseg)) 2221 goto out_put_layout_hdr; 2222 pnfs_put_layout_hdr(lo); 2223 dprintk("%s retrying\n", __func__); 2224 goto lookup_again; 2225 } 2226 2227 spin_unlock(&ino->i_lock); 2228 first = true; 2229 status = nfs4_select_rw_stateid(ctx->state, 2230 iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ, 2231 NULL, &stateid, NULL); 2232 if (status != 0) { 2233 lseg = ERR_PTR(status); 2234 trace_pnfs_update_layout(ino, pos, count, 2235 iomode, lo, lseg, 2236 PNFS_UPDATE_LAYOUT_INVALID_OPEN); 2237 nfs4_schedule_stateid_recovery(server, ctx->state); 2238 pnfs_clear_first_layoutget(lo); 2239 pnfs_put_layout_hdr(lo); 2240 goto lookup_again; 2241 } 2242 spin_lock(&ino->i_lock); 2243 } else { 2244 nfs4_stateid_copy(&stateid, &lo->plh_stateid); 2245 } 2246 2247 if (pnfs_layoutgets_blocked(lo)) { 2248 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2249 PNFS_UPDATE_LAYOUT_BLOCKED); 2250 goto out_unlock; 2251 } 2252 nfs_layoutget_begin(lo); 2253 spin_unlock(&ino->i_lock); 2254 2255 _add_to_server_list(lo, server); 2256 2257 pg_offset = arg.offset & ~PAGE_MASK; 2258 if (pg_offset) { 2259 arg.offset -= pg_offset; 2260 arg.length += pg_offset; 2261 } 2262 if (arg.length != NFS4_MAX_UINT64) 2263 arg.length = PAGE_ALIGN(arg.length); 2264 2265 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, &stateid, &arg, gfp_flags); 2266 if (!lgp) { 2267 lseg = ERR_PTR(-ENOMEM); 2268 trace_pnfs_update_layout(ino, pos, count, iomode, lo, NULL, 2269 PNFS_UPDATE_LAYOUT_NOMEM); 2270 nfs_layoutget_end(lo); 2271 goto out_put_layout_hdr; 2272 } 2273 2274 lgp->lo = lo; 2275 pnfs_get_layout_hdr(lo); 2276 2277 lseg = nfs4_proc_layoutget(lgp, &exception); 2278 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2279 PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET); 2280 nfs_layoutget_end(lo); 2281 if (IS_ERR(lseg)) { 2282 switch(PTR_ERR(lseg)) { 2283 case -EBUSY: 2284 if (time_after(jiffies, giveup)) 2285 lseg = NULL; 2286 break; 2287 case -ERECALLCONFLICT: 2288 case -EAGAIN: 2289 break; 2290 case -ENODATA: 2291 /* The server returned NFS4ERR_LAYOUTUNAVAILABLE */ 2292 pnfs_layout_set_fail_bit( 2293 lo, pnfs_iomode_to_fail_bit(iomode)); 2294 lseg = NULL; 2295 goto out_put_layout_hdr; 2296 default: 2297 if (!nfs_error_is_fatal(PTR_ERR(lseg))) { 2298 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2299 lseg = NULL; 2300 } 2301 goto out_put_layout_hdr; 2302 } 2303 if (lseg) { 2304 if (!exception.retry) 2305 goto out_put_layout_hdr; 2306 if (first) 2307 pnfs_clear_first_layoutget(lo); 2308 trace_pnfs_update_layout(ino, pos, count, 2309 iomode, lo, lseg, PNFS_UPDATE_LAYOUT_RETRY); 2310 pnfs_put_layout_hdr(lo); 2311 goto lookup_again; 2312 } 2313 } else { 2314 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2315 } 2316 2317 out_put_layout_hdr: 2318 if (first) 2319 pnfs_clear_first_layoutget(lo); 2320 trace_pnfs_update_layout(ino, pos, count, iomode, lo, lseg, 2321 PNFS_UPDATE_LAYOUT_EXIT); 2322 pnfs_put_layout_hdr(lo); 2323 out: 2324 dprintk("%s: inode %s/%llu pNFS layout segment %s for " 2325 "(%s, offset: %llu, length: %llu)\n", 2326 __func__, ino->i_sb->s_id, 2327 (unsigned long long)NFS_FILEID(ino), 2328 IS_ERR_OR_NULL(lseg) ? "not found" : "found", 2329 iomode==IOMODE_RW ? "read/write" : "read-only", 2330 (unsigned long long)pos, 2331 (unsigned long long)count); 2332 return lseg; 2333 out_unlock: 2334 spin_unlock(&ino->i_lock); 2335 goto out_put_layout_hdr; 2336 } 2337 EXPORT_SYMBOL_GPL(pnfs_update_layout); 2338 2339 static bool 2340 pnfs_sanity_check_layout_range(struct pnfs_layout_range *range) 2341 { 2342 switch (range->iomode) { 2343 case IOMODE_READ: 2344 case IOMODE_RW: 2345 break; 2346 default: 2347 return false; 2348 } 2349 if (range->offset == NFS4_MAX_UINT64) 2350 return false; 2351 if (range->length == 0) 2352 return false; 2353 if (range->length != NFS4_MAX_UINT64 && 2354 range->length > NFS4_MAX_UINT64 - range->offset) 2355 return false; 2356 return true; 2357 } 2358 2359 static struct pnfs_layout_hdr * 2360 _pnfs_grab_empty_layout(struct inode *ino, struct nfs_open_context *ctx) 2361 { 2362 struct pnfs_layout_hdr *lo; 2363 2364 spin_lock(&ino->i_lock); 2365 lo = pnfs_find_alloc_layout(ino, ctx, nfs_io_gfp_mask()); 2366 if (!lo) 2367 goto out_unlock; 2368 if (!test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) 2369 goto out_unlock; 2370 if (test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) 2371 goto out_unlock; 2372 if (pnfs_layoutgets_blocked(lo)) 2373 goto out_unlock; 2374 if (test_and_set_bit(NFS_LAYOUT_FIRST_LAYOUTGET, &lo->plh_flags)) 2375 goto out_unlock; 2376 nfs_layoutget_begin(lo); 2377 spin_unlock(&ino->i_lock); 2378 _add_to_server_list(lo, NFS_SERVER(ino)); 2379 return lo; 2380 2381 out_unlock: 2382 spin_unlock(&ino->i_lock); 2383 pnfs_put_layout_hdr(lo); 2384 return NULL; 2385 } 2386 2387 static void _lgopen_prepare_attached(struct nfs4_opendata *data, 2388 struct nfs_open_context *ctx) 2389 { 2390 struct inode *ino = data->dentry->d_inode; 2391 struct pnfs_layout_range rng = { 2392 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2393 IOMODE_RW: IOMODE_READ, 2394 .offset = 0, 2395 .length = NFS4_MAX_UINT64, 2396 }; 2397 struct nfs4_layoutget *lgp; 2398 struct pnfs_layout_hdr *lo; 2399 2400 /* Heuristic: don't send layoutget if we have cached data */ 2401 if (rng.iomode == IOMODE_READ && 2402 (i_size_read(ino) == 0 || ino->i_mapping->nrpages != 0)) 2403 return; 2404 2405 lo = _pnfs_grab_empty_layout(ino, ctx); 2406 if (!lo) 2407 return; 2408 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, &rng, 2409 nfs_io_gfp_mask()); 2410 if (!lgp) { 2411 pnfs_clear_first_layoutget(lo); 2412 nfs_layoutget_end(lo); 2413 pnfs_put_layout_hdr(lo); 2414 return; 2415 } 2416 lgp->lo = lo; 2417 data->lgp = lgp; 2418 data->o_arg.lg_args = &lgp->args; 2419 data->o_res.lg_res = &lgp->res; 2420 } 2421 2422 static void _lgopen_prepare_floating(struct nfs4_opendata *data, 2423 struct nfs_open_context *ctx) 2424 { 2425 struct inode *ino = data->dentry->d_inode; 2426 struct pnfs_layout_range rng = { 2427 .iomode = (data->o_arg.fmode & FMODE_WRITE) ? 2428 IOMODE_RW: IOMODE_READ, 2429 .offset = 0, 2430 .length = NFS4_MAX_UINT64, 2431 }; 2432 struct nfs4_layoutget *lgp; 2433 2434 lgp = pnfs_alloc_init_layoutget_args(ino, ctx, ¤t_stateid, &rng, 2435 nfs_io_gfp_mask()); 2436 if (!lgp) 2437 return; 2438 data->lgp = lgp; 2439 data->o_arg.lg_args = &lgp->args; 2440 data->o_res.lg_res = &lgp->res; 2441 } 2442 2443 void pnfs_lgopen_prepare(struct nfs4_opendata *data, 2444 struct nfs_open_context *ctx) 2445 { 2446 struct nfs_server *server = NFS_SERVER(data->dir->d_inode); 2447 2448 if (!(pnfs_enabled_sb(server) && 2449 server->pnfs_curr_ld->flags & PNFS_LAYOUTGET_ON_OPEN)) 2450 return; 2451 /* Could check on max_ops, but currently hardcoded high enough */ 2452 if (!nfs_server_capable(data->dir->d_inode, NFS_CAP_LGOPEN)) 2453 return; 2454 if (data->lgp) 2455 return; 2456 if (data->state) 2457 _lgopen_prepare_attached(data, ctx); 2458 else 2459 _lgopen_prepare_floating(data, ctx); 2460 } 2461 2462 void pnfs_parse_lgopen(struct inode *ino, struct nfs4_layoutget *lgp, 2463 struct nfs_open_context *ctx) 2464 { 2465 struct pnfs_layout_hdr *lo; 2466 struct pnfs_layout_segment *lseg; 2467 struct nfs_server *srv = NFS_SERVER(ino); 2468 u32 iomode; 2469 2470 if (!lgp) 2471 return; 2472 dprintk("%s: entered with status %i\n", __func__, lgp->res.status); 2473 if (lgp->res.status) { 2474 switch (lgp->res.status) { 2475 default: 2476 break; 2477 /* 2478 * Halt lgopen attempts if the server doesn't recognise 2479 * the "current stateid" value, the layout type, or the 2480 * layoutget operation as being valid. 2481 * Also if it complains about too many ops in the compound 2482 * or of the request/reply being too big. 2483 */ 2484 case -NFS4ERR_BAD_STATEID: 2485 case -NFS4ERR_NOTSUPP: 2486 case -NFS4ERR_REP_TOO_BIG: 2487 case -NFS4ERR_REP_TOO_BIG_TO_CACHE: 2488 case -NFS4ERR_REQ_TOO_BIG: 2489 case -NFS4ERR_TOO_MANY_OPS: 2490 case -NFS4ERR_UNKNOWN_LAYOUTTYPE: 2491 srv->caps &= ~NFS_CAP_LGOPEN; 2492 } 2493 return; 2494 } 2495 if (!lgp->lo) { 2496 lo = _pnfs_grab_empty_layout(ino, ctx); 2497 if (!lo) 2498 return; 2499 lgp->lo = lo; 2500 } else 2501 lo = lgp->lo; 2502 2503 lseg = pnfs_layout_process(lgp); 2504 if (!IS_ERR(lseg)) { 2505 iomode = lgp->args.range.iomode; 2506 pnfs_layout_clear_fail_bit(lo, pnfs_iomode_to_fail_bit(iomode)); 2507 pnfs_put_lseg(lseg); 2508 } 2509 } 2510 2511 void nfs4_lgopen_release(struct nfs4_layoutget *lgp) 2512 { 2513 if (lgp != NULL) { 2514 if (lgp->lo) { 2515 pnfs_clear_first_layoutget(lgp->lo); 2516 nfs_layoutget_end(lgp->lo); 2517 } 2518 pnfs_layoutget_free(lgp); 2519 } 2520 } 2521 2522 struct pnfs_layout_segment * 2523 pnfs_layout_process(struct nfs4_layoutget *lgp) 2524 { 2525 struct pnfs_layout_hdr *lo = lgp->lo; 2526 struct nfs4_layoutget_res *res = &lgp->res; 2527 struct pnfs_layout_segment *lseg; 2528 struct inode *ino = lo->plh_inode; 2529 LIST_HEAD(free_me); 2530 2531 if (!pnfs_sanity_check_layout_range(&res->range)) 2532 return ERR_PTR(-EINVAL); 2533 2534 /* Inject layout blob into I/O device driver */ 2535 lseg = NFS_SERVER(ino)->pnfs_curr_ld->alloc_lseg(lo, res, lgp->gfp_flags); 2536 if (IS_ERR_OR_NULL(lseg)) { 2537 if (!lseg) 2538 lseg = ERR_PTR(-ENOMEM); 2539 2540 dprintk("%s: Could not allocate layout: error %ld\n", 2541 __func__, PTR_ERR(lseg)); 2542 return lseg; 2543 } 2544 2545 pnfs_init_lseg(lo, lseg, &res->range, &res->stateid); 2546 2547 spin_lock(&ino->i_lock); 2548 if (pnfs_layoutgets_blocked(lo)) { 2549 dprintk("%s forget reply due to state\n", __func__); 2550 goto out_forget; 2551 } 2552 2553 if (test_bit(NFS_LAYOUT_DRAIN, &lo->plh_flags) && 2554 !pnfs_is_first_layoutget(lo)) 2555 goto out_forget; 2556 2557 if (nfs4_stateid_match_other(&lo->plh_stateid, &res->stateid)) { 2558 /* existing state ID, make sure the sequence number matches. */ 2559 if (pnfs_layout_stateid_blocked(lo, &res->stateid)) { 2560 if (!pnfs_layout_is_valid(lo)) 2561 lo->plh_barrier = 0; 2562 dprintk("%s forget reply due to sequence\n", __func__); 2563 goto out_forget; 2564 } 2565 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, false); 2566 } else if (pnfs_layout_is_valid(lo)) { 2567 /* 2568 * We got an entirely new state ID. Mark all segments for the 2569 * inode invalid, and retry the layoutget 2570 */ 2571 struct pnfs_layout_range range = { 2572 .iomode = IOMODE_ANY, 2573 .length = NFS4_MAX_UINT64, 2574 }; 2575 pnfs_mark_matching_lsegs_return(lo, &free_me, &range, 0); 2576 goto out_forget; 2577 } else { 2578 /* We have a completely new layout */ 2579 pnfs_set_layout_stateid(lo, &res->stateid, lgp->cred, true); 2580 } 2581 2582 pnfs_get_lseg(lseg); 2583 pnfs_layout_insert_lseg(lo, lseg, &free_me); 2584 2585 2586 if (res->return_on_close) 2587 set_bit(NFS_LSEG_ROC, &lseg->pls_flags); 2588 2589 spin_unlock(&ino->i_lock); 2590 pnfs_free_lseg_list(&free_me); 2591 return lseg; 2592 2593 out_forget: 2594 spin_unlock(&ino->i_lock); 2595 lseg->pls_layout = lo; 2596 NFS_SERVER(ino)->pnfs_curr_ld->free_lseg(lseg); 2597 return ERR_PTR(-EAGAIN); 2598 } 2599 2600 /** 2601 * pnfs_mark_matching_lsegs_return - Free or return matching layout segments 2602 * @lo: pointer to layout header 2603 * @tmp_list: list header to be used with pnfs_free_lseg_list() 2604 * @return_range: describe layout segment ranges to be returned 2605 * @seq: stateid seqid to match 2606 * 2607 * This function is mainly intended for use by layoutrecall. It attempts 2608 * to free the layout segment immediately, or else to mark it for return 2609 * as soon as its reference count drops to zero. 2610 * 2611 * Returns 2612 * - 0: a layoutreturn needs to be scheduled. 2613 * - EBUSY: there are layout segment that are still in use. 2614 * - ENOENT: there are no layout segments that need to be returned. 2615 */ 2616 int 2617 pnfs_mark_matching_lsegs_return(struct pnfs_layout_hdr *lo, 2618 struct list_head *tmp_list, 2619 const struct pnfs_layout_range *return_range, 2620 u32 seq) 2621 { 2622 struct pnfs_layout_segment *lseg, *next; 2623 struct nfs_server *server = NFS_SERVER(lo->plh_inode); 2624 int remaining = 0; 2625 2626 dprintk("%s:Begin lo %p\n", __func__, lo); 2627 2628 assert_spin_locked(&lo->plh_inode->i_lock); 2629 2630 if (test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 2631 tmp_list = &lo->plh_return_segs; 2632 2633 list_for_each_entry_safe(lseg, next, &lo->plh_segs, pls_list) 2634 if (pnfs_match_lseg_recall(lseg, return_range, seq)) { 2635 dprintk("%s: marking lseg %p iomode %d " 2636 "offset %llu length %llu\n", __func__, 2637 lseg, lseg->pls_range.iomode, 2638 lseg->pls_range.offset, 2639 lseg->pls_range.length); 2640 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 2641 tmp_list = &lo->plh_return_segs; 2642 if (mark_lseg_invalid(lseg, tmp_list)) 2643 continue; 2644 remaining++; 2645 set_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags); 2646 pnfs_lseg_cancel_io(server, lseg); 2647 } 2648 2649 if (remaining) { 2650 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2651 return -EBUSY; 2652 } 2653 2654 if (!list_empty(&lo->plh_return_segs)) { 2655 pnfs_set_plh_return_info(lo, return_range->iomode, seq); 2656 return 0; 2657 } 2658 2659 return -ENOENT; 2660 } 2661 2662 static void 2663 pnfs_mark_layout_for_return(struct inode *inode, 2664 const struct pnfs_layout_range *range) 2665 { 2666 struct pnfs_layout_hdr *lo; 2667 bool return_now = false; 2668 2669 spin_lock(&inode->i_lock); 2670 lo = NFS_I(inode)->layout; 2671 if (!pnfs_layout_is_valid(lo)) { 2672 spin_unlock(&inode->i_lock); 2673 return; 2674 } 2675 pnfs_set_plh_return_info(lo, range->iomode, 0); 2676 /* 2677 * mark all matching lsegs so that we are sure to have no live 2678 * segments at hand when sending layoutreturn. See pnfs_put_lseg() 2679 * for how it works. 2680 */ 2681 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, range, 0) != -EBUSY) { 2682 const struct cred *cred; 2683 nfs4_stateid stateid; 2684 enum pnfs_iomode iomode; 2685 2686 return_now = pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode); 2687 spin_unlock(&inode->i_lock); 2688 if (return_now) 2689 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, 2690 PNFS_FL_LAYOUTRETURN_ASYNC); 2691 } else { 2692 spin_unlock(&inode->i_lock); 2693 nfs_commit_inode(inode, 0); 2694 } 2695 } 2696 2697 void pnfs_error_mark_layout_for_return(struct inode *inode, 2698 struct pnfs_layout_segment *lseg) 2699 { 2700 struct pnfs_layout_range range = { 2701 .iomode = lseg->pls_range.iomode, 2702 .offset = 0, 2703 .length = NFS4_MAX_UINT64, 2704 }; 2705 2706 pnfs_mark_layout_for_return(inode, &range); 2707 } 2708 EXPORT_SYMBOL_GPL(pnfs_error_mark_layout_for_return); 2709 2710 static bool 2711 pnfs_layout_can_be_returned(struct pnfs_layout_hdr *lo) 2712 { 2713 return pnfs_layout_is_valid(lo) && 2714 !test_bit(NFS_LAYOUT_INODE_FREEING, &lo->plh_flags) && 2715 !test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); 2716 } 2717 2718 static struct pnfs_layout_segment * 2719 pnfs_find_first_lseg(struct pnfs_layout_hdr *lo, 2720 const struct pnfs_layout_range *range, 2721 enum pnfs_iomode iomode) 2722 { 2723 struct pnfs_layout_segment *lseg; 2724 2725 list_for_each_entry(lseg, &lo->plh_segs, pls_list) { 2726 if (!test_bit(NFS_LSEG_VALID, &lseg->pls_flags)) 2727 continue; 2728 if (test_bit(NFS_LSEG_LAYOUTRETURN, &lseg->pls_flags)) 2729 continue; 2730 if (lseg->pls_range.iomode != iomode && iomode != IOMODE_ANY) 2731 continue; 2732 if (pnfs_lseg_range_intersecting(&lseg->pls_range, range)) 2733 return lseg; 2734 } 2735 return NULL; 2736 } 2737 2738 /* Find open file states whose mode matches that of the range */ 2739 static bool 2740 pnfs_should_return_unused_layout(struct pnfs_layout_hdr *lo, 2741 const struct pnfs_layout_range *range) 2742 { 2743 struct list_head *head; 2744 struct nfs_open_context *ctx; 2745 fmode_t mode = 0; 2746 2747 if (!pnfs_layout_can_be_returned(lo) || 2748 !pnfs_find_first_lseg(lo, range, range->iomode)) 2749 return false; 2750 2751 head = &NFS_I(lo->plh_inode)->open_files; 2752 list_for_each_entry_rcu(ctx, head, list) { 2753 if (ctx->state) 2754 mode |= ctx->state->state & (FMODE_READ|FMODE_WRITE); 2755 } 2756 2757 switch (range->iomode) { 2758 default: 2759 break; 2760 case IOMODE_READ: 2761 mode &= ~FMODE_WRITE; 2762 break; 2763 case IOMODE_RW: 2764 if (pnfs_find_first_lseg(lo, range, IOMODE_READ)) 2765 mode &= ~FMODE_READ; 2766 } 2767 return mode == 0; 2768 } 2769 2770 static int pnfs_layout_return_unused_byserver(struct nfs_server *server, 2771 void *data) 2772 { 2773 const struct pnfs_layout_range *range = data; 2774 const struct cred *cred; 2775 struct pnfs_layout_hdr *lo; 2776 struct inode *inode; 2777 nfs4_stateid stateid; 2778 enum pnfs_iomode iomode; 2779 2780 restart: 2781 rcu_read_lock(); 2782 list_for_each_entry_rcu(lo, &server->layouts, plh_layouts) { 2783 inode = lo->plh_inode; 2784 if (!inode || !pnfs_layout_can_be_returned(lo) || 2785 test_bit(NFS_LAYOUT_RETURN_REQUESTED, &lo->plh_flags)) 2786 continue; 2787 spin_lock(&inode->i_lock); 2788 if (!lo->plh_inode || 2789 !pnfs_should_return_unused_layout(lo, range)) { 2790 spin_unlock(&inode->i_lock); 2791 continue; 2792 } 2793 pnfs_get_layout_hdr(lo); 2794 pnfs_set_plh_return_info(lo, range->iomode, 0); 2795 if (pnfs_mark_matching_lsegs_return(lo, &lo->plh_return_segs, 2796 range, 0) != 0 || 2797 !pnfs_prepare_layoutreturn(lo, &stateid, &cred, &iomode)) { 2798 spin_unlock(&inode->i_lock); 2799 rcu_read_unlock(); 2800 pnfs_put_layout_hdr(lo); 2801 cond_resched(); 2802 goto restart; 2803 } 2804 spin_unlock(&inode->i_lock); 2805 rcu_read_unlock(); 2806 pnfs_send_layoutreturn(lo, &stateid, &cred, iomode, 2807 PNFS_FL_LAYOUTRETURN_ASYNC); 2808 pnfs_put_layout_hdr(lo); 2809 cond_resched(); 2810 goto restart; 2811 } 2812 rcu_read_unlock(); 2813 return 0; 2814 } 2815 2816 void 2817 pnfs_layout_return_unused_byclid(struct nfs_client *clp, 2818 enum pnfs_iomode iomode) 2819 { 2820 struct pnfs_layout_range range = { 2821 .iomode = iomode, 2822 .offset = 0, 2823 .length = NFS4_MAX_UINT64, 2824 }; 2825 2826 nfs_client_for_each_server(clp, pnfs_layout_return_unused_byserver, 2827 &range); 2828 } 2829 2830 /* Check if we have we have a valid layout but if there isn't an intersection 2831 * between the request and the pgio->pg_lseg, put this pgio->pg_lseg away. 2832 */ 2833 void 2834 pnfs_generic_pg_check_layout(struct nfs_pageio_descriptor *pgio, 2835 struct nfs_page *req) 2836 { 2837 if (pgio->pg_lseg == NULL || 2838 (test_bit(NFS_LSEG_VALID, &pgio->pg_lseg->pls_flags) && 2839 pnfs_lseg_request_intersecting(pgio->pg_lseg, req))) 2840 return; 2841 pnfs_put_lseg(pgio->pg_lseg); 2842 pgio->pg_lseg = NULL; 2843 } 2844 EXPORT_SYMBOL_GPL(pnfs_generic_pg_check_layout); 2845 2846 void 2847 pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req) 2848 { 2849 u64 rd_size; 2850 2851 pnfs_generic_pg_check_layout(pgio, req); 2852 if (pgio->pg_lseg == NULL) { 2853 if (pgio->pg_dreq == NULL) 2854 rd_size = i_size_read(pgio->pg_inode) - req_offset(req); 2855 else 2856 rd_size = nfs_dreq_bytes_left(pgio->pg_dreq, 2857 req_offset(req)); 2858 2859 pgio->pg_lseg = 2860 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 2861 req_offset(req), rd_size, 2862 IOMODE_READ, false, 2863 nfs_io_gfp_mask()); 2864 if (IS_ERR(pgio->pg_lseg)) { 2865 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2866 pgio->pg_lseg = NULL; 2867 return; 2868 } 2869 } 2870 /* If no lseg, fall back to read through mds */ 2871 if (pgio->pg_lseg == NULL) 2872 nfs_pageio_reset_read_mds(pgio); 2873 2874 } 2875 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_read); 2876 2877 void 2878 pnfs_generic_pg_init_write(struct nfs_pageio_descriptor *pgio, 2879 struct nfs_page *req, u64 wb_size) 2880 { 2881 pnfs_generic_pg_check_layout(pgio, req); 2882 if (pgio->pg_lseg == NULL) { 2883 pgio->pg_lseg = 2884 pnfs_update_layout(pgio->pg_inode, nfs_req_openctx(req), 2885 req_offset(req), wb_size, IOMODE_RW, 2886 false, nfs_io_gfp_mask()); 2887 if (IS_ERR(pgio->pg_lseg)) { 2888 pgio->pg_error = PTR_ERR(pgio->pg_lseg); 2889 pgio->pg_lseg = NULL; 2890 return; 2891 } 2892 } 2893 /* If no lseg, fall back to write through mds */ 2894 if (pgio->pg_lseg == NULL) 2895 nfs_pageio_reset_write_mds(pgio); 2896 } 2897 EXPORT_SYMBOL_GPL(pnfs_generic_pg_init_write); 2898 2899 void 2900 pnfs_generic_pg_cleanup(struct nfs_pageio_descriptor *desc) 2901 { 2902 if (desc->pg_lseg) { 2903 pnfs_put_lseg(desc->pg_lseg); 2904 desc->pg_lseg = NULL; 2905 } 2906 } 2907 EXPORT_SYMBOL_GPL(pnfs_generic_pg_cleanup); 2908 2909 /* 2910 * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number 2911 * of bytes (maximum @req->wb_bytes) that can be coalesced. 2912 */ 2913 size_t 2914 pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, 2915 struct nfs_page *prev, struct nfs_page *req) 2916 { 2917 unsigned int size; 2918 u64 seg_end, req_start, seg_left; 2919 2920 size = nfs_generic_pg_test(pgio, prev, req); 2921 if (!size) 2922 return 0; 2923 2924 /* 2925 * 'size' contains the number of bytes left in the current page (up 2926 * to the original size asked for in @req->wb_bytes). 2927 * 2928 * Calculate how many bytes are left in the layout segment 2929 * and if there are less bytes than 'size', return that instead. 2930 * 2931 * Please also note that 'end_offset' is actually the offset of the 2932 * first byte that lies outside the pnfs_layout_range. FIXME? 2933 * 2934 */ 2935 if (pgio->pg_lseg) { 2936 seg_end = pnfs_end_offset(pgio->pg_lseg->pls_range.offset, 2937 pgio->pg_lseg->pls_range.length); 2938 req_start = req_offset(req); 2939 2940 /* start of request is past the last byte of this segment */ 2941 if (req_start >= seg_end) 2942 return 0; 2943 2944 /* adjust 'size' iff there are fewer bytes left in the 2945 * segment than what nfs_generic_pg_test returned */ 2946 seg_left = seg_end - req_start; 2947 if (seg_left < size) 2948 size = (unsigned int)seg_left; 2949 } 2950 2951 return size; 2952 } 2953 EXPORT_SYMBOL_GPL(pnfs_generic_pg_test); 2954 2955 int pnfs_write_done_resend_to_mds(struct nfs_pgio_header *hdr) 2956 { 2957 struct nfs_pageio_descriptor pgio; 2958 2959 /* Resend all requests through the MDS */ 2960 nfs_pageio_init_write(&pgio, hdr->inode, FLUSH_STABLE, true, 2961 hdr->completion_ops); 2962 return nfs_pageio_resend(&pgio, hdr); 2963 } 2964 EXPORT_SYMBOL_GPL(pnfs_write_done_resend_to_mds); 2965 2966 static void pnfs_ld_handle_write_error(struct nfs_pgio_header *hdr) 2967 { 2968 2969 dprintk("pnfs write error = %d\n", hdr->pnfs_error); 2970 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 2971 PNFS_LAYOUTRET_ON_ERROR) { 2972 pnfs_return_layout(hdr->inode); 2973 } 2974 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 2975 hdr->task.tk_status = pnfs_write_done_resend_to_mds(hdr); 2976 } 2977 2978 /* 2979 * Called by non rpc-based layout drivers 2980 */ 2981 void pnfs_ld_write_done(struct nfs_pgio_header *hdr) 2982 { 2983 if (likely(!hdr->pnfs_error)) { 2984 pnfs_set_layoutcommit(hdr->inode, hdr->lseg, 2985 hdr->mds_offset + hdr->res.count); 2986 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 2987 } 2988 trace_nfs4_pnfs_write(hdr, hdr->pnfs_error); 2989 if (unlikely(hdr->pnfs_error)) 2990 pnfs_ld_handle_write_error(hdr); 2991 hdr->mds_ops->rpc_release(hdr); 2992 } 2993 EXPORT_SYMBOL_GPL(pnfs_ld_write_done); 2994 2995 static void 2996 pnfs_write_through_mds(struct nfs_pageio_descriptor *desc, 2997 struct nfs_pgio_header *hdr) 2998 { 2999 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 3000 3001 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 3002 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 3003 nfs_pageio_reset_write_mds(desc); 3004 mirror->pg_recoalesce = 1; 3005 } 3006 hdr->completion_ops->completion(hdr); 3007 } 3008 3009 static enum pnfs_try_status 3010 pnfs_try_to_write_data(struct nfs_pgio_header *hdr, 3011 const struct rpc_call_ops *call_ops, 3012 struct pnfs_layout_segment *lseg, 3013 int how) 3014 { 3015 struct inode *inode = hdr->inode; 3016 enum pnfs_try_status trypnfs; 3017 struct nfs_server *nfss = NFS_SERVER(inode); 3018 3019 hdr->mds_ops = call_ops; 3020 3021 dprintk("%s: Writing ino:%lu %u@%llu (how %d)\n", __func__, 3022 inode->i_ino, hdr->args.count, hdr->args.offset, how); 3023 trypnfs = nfss->pnfs_curr_ld->write_pagelist(hdr, how); 3024 if (trypnfs != PNFS_NOT_ATTEMPTED) 3025 nfs_inc_stats(inode, NFSIOS_PNFS_WRITE); 3026 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 3027 return trypnfs; 3028 } 3029 3030 static void 3031 pnfs_do_write(struct nfs_pageio_descriptor *desc, 3032 struct nfs_pgio_header *hdr, int how) 3033 { 3034 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 3035 struct pnfs_layout_segment *lseg = desc->pg_lseg; 3036 enum pnfs_try_status trypnfs; 3037 3038 trypnfs = pnfs_try_to_write_data(hdr, call_ops, lseg, how); 3039 switch (trypnfs) { 3040 case PNFS_NOT_ATTEMPTED: 3041 pnfs_write_through_mds(desc, hdr); 3042 break; 3043 case PNFS_ATTEMPTED: 3044 break; 3045 case PNFS_TRY_AGAIN: 3046 /* cleanup hdr and prepare to redo pnfs */ 3047 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 3048 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 3049 list_splice_init(&hdr->pages, &mirror->pg_list); 3050 mirror->pg_recoalesce = 1; 3051 } 3052 hdr->mds_ops->rpc_release(hdr); 3053 } 3054 } 3055 3056 static void pnfs_writehdr_free(struct nfs_pgio_header *hdr) 3057 { 3058 pnfs_put_lseg(hdr->lseg); 3059 nfs_pgio_header_free(hdr); 3060 } 3061 3062 int 3063 pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc) 3064 { 3065 struct nfs_pgio_header *hdr; 3066 int ret; 3067 3068 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 3069 if (!hdr) { 3070 desc->pg_error = -ENOMEM; 3071 return desc->pg_error; 3072 } 3073 nfs_pgheader_init(desc, hdr, pnfs_writehdr_free); 3074 3075 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 3076 ret = nfs_generic_pgio(desc, hdr); 3077 if (!ret) 3078 pnfs_do_write(desc, hdr, desc->pg_ioflags); 3079 3080 return ret; 3081 } 3082 EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages); 3083 3084 int pnfs_read_done_resend_to_mds(struct nfs_pgio_header *hdr) 3085 { 3086 struct nfs_pageio_descriptor pgio; 3087 3088 /* Resend all requests through the MDS */ 3089 nfs_pageio_init_read(&pgio, hdr->inode, true, hdr->completion_ops); 3090 return nfs_pageio_resend(&pgio, hdr); 3091 } 3092 EXPORT_SYMBOL_GPL(pnfs_read_done_resend_to_mds); 3093 3094 static void pnfs_ld_handle_read_error(struct nfs_pgio_header *hdr) 3095 { 3096 dprintk("pnfs read error = %d\n", hdr->pnfs_error); 3097 if (NFS_SERVER(hdr->inode)->pnfs_curr_ld->flags & 3098 PNFS_LAYOUTRET_ON_ERROR) { 3099 pnfs_return_layout(hdr->inode); 3100 } 3101 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) 3102 hdr->task.tk_status = pnfs_read_done_resend_to_mds(hdr); 3103 } 3104 3105 /* 3106 * Called by non rpc-based layout drivers 3107 */ 3108 void pnfs_ld_read_done(struct nfs_pgio_header *hdr) 3109 { 3110 if (likely(!hdr->pnfs_error)) 3111 hdr->mds_ops->rpc_call_done(&hdr->task, hdr); 3112 trace_nfs4_pnfs_read(hdr, hdr->pnfs_error); 3113 if (unlikely(hdr->pnfs_error)) 3114 pnfs_ld_handle_read_error(hdr); 3115 hdr->mds_ops->rpc_release(hdr); 3116 } 3117 EXPORT_SYMBOL_GPL(pnfs_ld_read_done); 3118 3119 static void 3120 pnfs_read_through_mds(struct nfs_pageio_descriptor *desc, 3121 struct nfs_pgio_header *hdr) 3122 { 3123 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 3124 3125 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 3126 list_splice_tail_init(&hdr->pages, &mirror->pg_list); 3127 nfs_pageio_reset_read_mds(desc); 3128 mirror->pg_recoalesce = 1; 3129 } 3130 hdr->completion_ops->completion(hdr); 3131 } 3132 3133 /* 3134 * Call the appropriate parallel I/O subsystem read function. 3135 */ 3136 static enum pnfs_try_status 3137 pnfs_try_to_read_data(struct nfs_pgio_header *hdr, 3138 const struct rpc_call_ops *call_ops, 3139 struct pnfs_layout_segment *lseg) 3140 { 3141 struct inode *inode = hdr->inode; 3142 struct nfs_server *nfss = NFS_SERVER(inode); 3143 enum pnfs_try_status trypnfs; 3144 3145 hdr->mds_ops = call_ops; 3146 3147 dprintk("%s: Reading ino:%lu %u@%llu\n", 3148 __func__, inode->i_ino, hdr->args.count, hdr->args.offset); 3149 3150 trypnfs = nfss->pnfs_curr_ld->read_pagelist(hdr); 3151 if (trypnfs != PNFS_NOT_ATTEMPTED) 3152 nfs_inc_stats(inode, NFSIOS_PNFS_READ); 3153 dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs); 3154 return trypnfs; 3155 } 3156 3157 /* Resend all requests through pnfs. */ 3158 void pnfs_read_resend_pnfs(struct nfs_pgio_header *hdr, 3159 unsigned int mirror_idx) 3160 { 3161 struct nfs_pageio_descriptor pgio; 3162 3163 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 3164 /* Prevent deadlocks with layoutreturn! */ 3165 pnfs_put_lseg(hdr->lseg); 3166 hdr->lseg = NULL; 3167 3168 nfs_pageio_init_read(&pgio, hdr->inode, false, 3169 hdr->completion_ops); 3170 pgio.pg_mirror_idx = mirror_idx; 3171 hdr->task.tk_status = nfs_pageio_resend(&pgio, hdr); 3172 } 3173 } 3174 EXPORT_SYMBOL_GPL(pnfs_read_resend_pnfs); 3175 3176 static void 3177 pnfs_do_read(struct nfs_pageio_descriptor *desc, struct nfs_pgio_header *hdr) 3178 { 3179 const struct rpc_call_ops *call_ops = desc->pg_rpc_callops; 3180 struct pnfs_layout_segment *lseg = desc->pg_lseg; 3181 enum pnfs_try_status trypnfs; 3182 3183 trypnfs = pnfs_try_to_read_data(hdr, call_ops, lseg); 3184 switch (trypnfs) { 3185 case PNFS_NOT_ATTEMPTED: 3186 pnfs_read_through_mds(desc, hdr); 3187 break; 3188 case PNFS_ATTEMPTED: 3189 break; 3190 case PNFS_TRY_AGAIN: 3191 /* cleanup hdr and prepare to redo pnfs */ 3192 if (!test_and_set_bit(NFS_IOHDR_REDO, &hdr->flags)) { 3193 struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); 3194 list_splice_init(&hdr->pages, &mirror->pg_list); 3195 mirror->pg_recoalesce = 1; 3196 } 3197 hdr->mds_ops->rpc_release(hdr); 3198 } 3199 } 3200 3201 static void pnfs_readhdr_free(struct nfs_pgio_header *hdr) 3202 { 3203 pnfs_put_lseg(hdr->lseg); 3204 nfs_pgio_header_free(hdr); 3205 } 3206 3207 int 3208 pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc) 3209 { 3210 struct nfs_pgio_header *hdr; 3211 int ret; 3212 3213 hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); 3214 if (!hdr) { 3215 desc->pg_error = -ENOMEM; 3216 return desc->pg_error; 3217 } 3218 nfs_pgheader_init(desc, hdr, pnfs_readhdr_free); 3219 hdr->lseg = pnfs_get_lseg(desc->pg_lseg); 3220 ret = nfs_generic_pgio(desc, hdr); 3221 if (!ret) 3222 pnfs_do_read(desc, hdr); 3223 return ret; 3224 } 3225 EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages); 3226 3227 static void pnfs_clear_layoutcommitting(struct inode *inode) 3228 { 3229 unsigned long *bitlock = &NFS_I(inode)->flags; 3230 3231 clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock); 3232 smp_mb__after_atomic(); 3233 wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING); 3234 } 3235 3236 /* 3237 * There can be multiple RW segments. 3238 */ 3239 static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp) 3240 { 3241 struct pnfs_layout_segment *lseg; 3242 3243 list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) { 3244 if (lseg->pls_range.iomode == IOMODE_RW && 3245 test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) 3246 list_add(&lseg->pls_lc_list, listp); 3247 } 3248 } 3249 3250 static void pnfs_list_write_lseg_done(struct inode *inode, struct list_head *listp) 3251 { 3252 struct pnfs_layout_segment *lseg, *tmp; 3253 3254 /* Matched by references in pnfs_set_layoutcommit */ 3255 list_for_each_entry_safe(lseg, tmp, listp, pls_lc_list) { 3256 list_del_init(&lseg->pls_lc_list); 3257 pnfs_put_lseg(lseg); 3258 } 3259 3260 pnfs_clear_layoutcommitting(inode); 3261 } 3262 3263 void pnfs_set_lo_fail(struct pnfs_layout_segment *lseg) 3264 { 3265 pnfs_layout_io_set_failed(lseg->pls_layout, lseg->pls_range.iomode); 3266 } 3267 EXPORT_SYMBOL_GPL(pnfs_set_lo_fail); 3268 3269 void 3270 pnfs_set_layoutcommit(struct inode *inode, struct pnfs_layout_segment *lseg, 3271 loff_t end_pos) 3272 { 3273 struct nfs_inode *nfsi = NFS_I(inode); 3274 bool mark_as_dirty = false; 3275 3276 spin_lock(&inode->i_lock); 3277 if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) { 3278 nfsi->layout->plh_lwb = end_pos; 3279 mark_as_dirty = true; 3280 dprintk("%s: Set layoutcommit for inode %lu ", 3281 __func__, inode->i_ino); 3282 } else if (end_pos > nfsi->layout->plh_lwb) 3283 nfsi->layout->plh_lwb = end_pos; 3284 if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags)) { 3285 /* references matched in nfs4_layoutcommit_release */ 3286 pnfs_get_lseg(lseg); 3287 } 3288 spin_unlock(&inode->i_lock); 3289 dprintk("%s: lseg %p end_pos %llu\n", 3290 __func__, lseg, nfsi->layout->plh_lwb); 3291 3292 /* if pnfs_layoutcommit_inode() runs between inode locks, the next one 3293 * will be a noop because NFS_INO_LAYOUTCOMMIT will not be set */ 3294 if (mark_as_dirty) 3295 mark_inode_dirty_sync(inode); 3296 } 3297 EXPORT_SYMBOL_GPL(pnfs_set_layoutcommit); 3298 3299 void pnfs_cleanup_layoutcommit(struct nfs4_layoutcommit_data *data) 3300 { 3301 struct nfs_server *nfss = NFS_SERVER(data->args.inode); 3302 3303 if (nfss->pnfs_curr_ld->cleanup_layoutcommit) 3304 nfss->pnfs_curr_ld->cleanup_layoutcommit(data); 3305 pnfs_list_write_lseg_done(data->args.inode, &data->lseg_list); 3306 } 3307 3308 /* 3309 * For the LAYOUT4_NFSV4_1_FILES layout type, NFS_DATA_SYNC WRITEs and 3310 * NFS_UNSTABLE WRITEs with a COMMIT to data servers must store enough 3311 * data to disk to allow the server to recover the data if it crashes. 3312 * LAYOUTCOMMIT is only needed when the NFL4_UFLG_COMMIT_THRU_MDS flag 3313 * is off, and a COMMIT is sent to a data server, or 3314 * if WRITEs to a data server return NFS_DATA_SYNC. 3315 */ 3316 int 3317 pnfs_layoutcommit_inode(struct inode *inode, bool sync) 3318 { 3319 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 3320 struct nfs4_layoutcommit_data *data; 3321 struct nfs_inode *nfsi = NFS_I(inode); 3322 loff_t end_pos; 3323 int status; 3324 3325 if (!pnfs_layoutcommit_outstanding(inode)) 3326 return 0; 3327 3328 dprintk("--> %s inode %lu\n", __func__, inode->i_ino); 3329 3330 status = -EAGAIN; 3331 if (test_and_set_bit(NFS_INO_LAYOUTCOMMITTING, &nfsi->flags)) { 3332 if (!sync) 3333 goto out; 3334 status = wait_on_bit_lock_action(&nfsi->flags, 3335 NFS_INO_LAYOUTCOMMITTING, 3336 nfs_wait_bit_killable, 3337 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); 3338 if (status) 3339 goto out; 3340 } 3341 3342 status = -ENOMEM; 3343 /* Note kzalloc ensures data->res.seq_res.sr_slot == NULL */ 3344 data = kzalloc(sizeof(*data), nfs_io_gfp_mask()); 3345 if (!data) 3346 goto clear_layoutcommitting; 3347 3348 status = 0; 3349 spin_lock(&inode->i_lock); 3350 if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) 3351 goto out_unlock; 3352 3353 INIT_LIST_HEAD(&data->lseg_list); 3354 pnfs_list_write_lseg(inode, &data->lseg_list); 3355 3356 end_pos = nfsi->layout->plh_lwb; 3357 3358 nfs4_stateid_copy(&data->args.stateid, &nfsi->layout->plh_stateid); 3359 data->cred = get_cred(nfsi->layout->plh_lc_cred); 3360 spin_unlock(&inode->i_lock); 3361 3362 data->args.inode = inode; 3363 nfs_fattr_init(&data->fattr); 3364 data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask; 3365 data->res.fattr = &data->fattr; 3366 if (end_pos != 0) 3367 data->args.lastbytewritten = end_pos - 1; 3368 else 3369 data->args.lastbytewritten = U64_MAX; 3370 data->res.server = NFS_SERVER(inode); 3371 3372 if (ld->prepare_layoutcommit) { 3373 status = ld->prepare_layoutcommit(&data->args); 3374 if (status) { 3375 put_cred(data->cred); 3376 spin_lock(&inode->i_lock); 3377 set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags); 3378 if (end_pos > nfsi->layout->plh_lwb) 3379 nfsi->layout->plh_lwb = end_pos; 3380 goto out_unlock; 3381 } 3382 } 3383 3384 3385 status = nfs4_proc_layoutcommit(data, sync); 3386 out: 3387 if (status) 3388 mark_inode_dirty_sync(inode); 3389 dprintk("<-- %s status %d\n", __func__, status); 3390 return status; 3391 out_unlock: 3392 spin_unlock(&inode->i_lock); 3393 kfree(data); 3394 clear_layoutcommitting: 3395 pnfs_clear_layoutcommitting(inode); 3396 goto out; 3397 } 3398 EXPORT_SYMBOL_GPL(pnfs_layoutcommit_inode); 3399 3400 int 3401 pnfs_generic_sync(struct inode *inode, bool datasync) 3402 { 3403 return pnfs_layoutcommit_inode(inode, true); 3404 } 3405 EXPORT_SYMBOL_GPL(pnfs_generic_sync); 3406 3407 struct nfs4_threshold *pnfs_mdsthreshold_alloc(void) 3408 { 3409 struct nfs4_threshold *thp; 3410 3411 thp = kzalloc(sizeof(*thp), nfs_io_gfp_mask()); 3412 if (!thp) { 3413 dprintk("%s mdsthreshold allocation failed\n", __func__); 3414 return NULL; 3415 } 3416 return thp; 3417 } 3418 3419 #if IS_ENABLED(CONFIG_NFS_V4_2) 3420 int 3421 pnfs_report_layoutstat(struct inode *inode, gfp_t gfp_flags) 3422 { 3423 struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld; 3424 struct nfs_server *server = NFS_SERVER(inode); 3425 struct nfs_inode *nfsi = NFS_I(inode); 3426 struct nfs42_layoutstat_data *data; 3427 struct pnfs_layout_hdr *hdr; 3428 int status = 0; 3429 3430 if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats) 3431 goto out; 3432 3433 if (!nfs_server_capable(inode, NFS_CAP_LAYOUTSTATS)) 3434 goto out; 3435 3436 if (test_and_set_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags)) 3437 goto out; 3438 3439 spin_lock(&inode->i_lock); 3440 if (!NFS_I(inode)->layout) { 3441 spin_unlock(&inode->i_lock); 3442 goto out_clear_layoutstats; 3443 } 3444 hdr = NFS_I(inode)->layout; 3445 pnfs_get_layout_hdr(hdr); 3446 spin_unlock(&inode->i_lock); 3447 3448 data = kzalloc(sizeof(*data), gfp_flags); 3449 if (!data) { 3450 status = -ENOMEM; 3451 goto out_put; 3452 } 3453 3454 data->args.fh = NFS_FH(inode); 3455 data->args.inode = inode; 3456 status = ld->prepare_layoutstats(&data->args); 3457 if (status) 3458 goto out_free; 3459 3460 status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data); 3461 3462 out: 3463 dprintk("%s returns %d\n", __func__, status); 3464 return status; 3465 3466 out_free: 3467 kfree(data); 3468 out_put: 3469 pnfs_put_layout_hdr(hdr); 3470 out_clear_layoutstats: 3471 smp_mb__before_atomic(); 3472 clear_bit(NFS_INO_LAYOUTSTATS, &nfsi->flags); 3473 smp_mb__after_atomic(); 3474 goto out; 3475 } 3476 EXPORT_SYMBOL_GPL(pnfs_report_layoutstat); 3477 #endif 3478 3479 unsigned int layoutstats_timer; 3480 module_param(layoutstats_timer, uint, 0644); 3481 EXPORT_SYMBOL_GPL(layoutstats_timer); 3482