1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/types.h> 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/buf.h> 32 #include <sys/cred.h> 33 #include <sys/errno.h> 34 #include <sys/vnode.h> 35 #include <sys/vfs_opreg.h> 36 #include <sys/cmn_err.h> 37 #include <sys/swap.h> 38 #include <sys/mman.h> 39 #include <sys/vmsystm.h> 40 #include <sys/vtrace.h> 41 #include <sys/debug.h> 42 #include <sys/sysmacros.h> 43 #include <sys/vm.h> 44 45 #include <sys/fs/swapnode.h> 46 47 #include <vm/seg.h> 48 #include <vm/page.h> 49 #include <vm/pvn.h> 50 #include <fs/fs_subr.h> 51 52 #include <vm/seg_kp.h> 53 54 /* 55 * Define the routines within this file. 56 */ 57 static int swap_getpage(struct vnode *vp, offset_t off, size_t len, 58 uint_t *protp, struct page **plarr, size_t plsz, struct seg *seg, 59 caddr_t addr, enum seg_rw rw, struct cred *cr, caller_context_t *ct); 60 static int swap_putpage(struct vnode *vp, offset_t off, size_t len, 61 int flags, struct cred *cr, caller_context_t *ct); 62 static void swap_inactive(struct vnode *vp, struct cred *cr, 63 caller_context_t *ct); 64 static void swap_dispose(vnode_t *vp, page_t *pp, int fl, int dn, 65 cred_t *cr, caller_context_t *ct); 66 67 static int swap_getapage(struct vnode *vp, u_offset_t off, size_t len, 68 uint_t *protp, page_t **plarr, size_t plsz, 69 struct seg *seg, caddr_t addr, enum seg_rw rw, struct cred *cr); 70 71 int swap_getconpage(struct vnode *vp, u_offset_t off, size_t len, 72 uint_t *protp, page_t **plarr, size_t plsz, page_t *conpp, 73 uint_t *pszc, spgcnt_t *nreloc, struct seg *seg, caddr_t addr, 74 enum seg_rw rw, struct cred *cr); 75 76 static int swap_putapage(struct vnode *vp, page_t *pp, u_offset_t *off, 77 size_t *lenp, int flags, struct cred *cr); 78 79 const fs_operation_def_t swap_vnodeops_template[] = { 80 VOPNAME_INACTIVE, { .vop_inactive = swap_inactive }, 81 VOPNAME_GETPAGE, { .vop_getpage = swap_getpage }, 82 VOPNAME_PUTPAGE, { .vop_putpage = swap_putpage }, 83 VOPNAME_DISPOSE, { .vop_dispose = swap_dispose }, 84 VOPNAME_SETFL, { .error = fs_error }, 85 VOPNAME_POLL, { .error = fs_error }, 86 VOPNAME_PATHCONF, { .error = fs_error }, 87 VOPNAME_GETSECATTR, { .error = fs_error }, 88 VOPNAME_SHRLOCK, { .error = fs_error }, 89 NULL, NULL 90 }; 91 92 vnodeops_t *swap_vnodeops; 93 94 /* ARGSUSED */ 95 static void 96 swap_inactive( 97 struct vnode *vp, 98 struct cred *cr, 99 caller_context_t *ct) 100 { 101 SWAPFS_PRINT(SWAP_VOPS, "swap_inactive: vp %x\n", vp, 0, 0, 0, 0); 102 } 103 104 /* 105 * Return all the pages from [off..off+len] in given file 106 */ 107 /*ARGSUSED*/ 108 static int 109 swap_getpage( 110 struct vnode *vp, 111 offset_t off, 112 size_t len, 113 uint_t *protp, 114 page_t *pl[], 115 size_t plsz, 116 struct seg *seg, 117 caddr_t addr, 118 enum seg_rw rw, 119 struct cred *cr, 120 caller_context_t *ct) 121 { 122 int err; 123 124 SWAPFS_PRINT(SWAP_VOPS, "swap_getpage: vp %p, off %llx, len %lx\n", 125 (void *)vp, off, len, 0, 0); 126 127 TRACE_3(TR_FAC_SWAPFS, TR_SWAPFS_GETPAGE, 128 "swapfs getpage:vp %p off %llx len %ld", 129 (void *)vp, off, len); 130 131 if (len <= PAGESIZE) { 132 err = swap_getapage(vp, (u_offset_t)off, len, protp, pl, plsz, 133 seg, addr, rw, cr); 134 } else { 135 err = pvn_getpages(swap_getapage, vp, (u_offset_t)off, len, 136 protp, pl, plsz, seg, addr, rw, cr); 137 } 138 139 return (err); 140 } 141 142 /* 143 * Called from pvn_getpages or swap_getpage to get a particular page. 144 */ 145 /*ARGSUSED*/ 146 static int 147 swap_getapage( 148 struct vnode *vp, 149 u_offset_t off, 150 size_t len, 151 uint_t *protp, 152 page_t *pl[], 153 size_t plsz, 154 struct seg *seg, 155 caddr_t addr, 156 enum seg_rw rw, 157 struct cred *cr) 158 { 159 struct page *pp, *rpp; 160 int flags; 161 int err = 0; 162 struct vnode *pvp = NULL; 163 u_offset_t poff; 164 int flag_noreloc; 165 se_t lock; 166 extern int kcage_on; 167 int upgrade = 0; 168 169 SWAPFS_PRINT(SWAP_VOPS, "swap_getapage: vp %p, off %llx, len %lx\n", 170 vp, off, len, 0, 0); 171 172 /* 173 * Until there is a call-back mechanism to cause SEGKP 174 * pages to be unlocked, make them non-relocatable. 175 */ 176 if (SEG_IS_SEGKP(seg)) 177 flag_noreloc = PG_NORELOC; 178 else 179 flag_noreloc = 0; 180 181 if (protp != NULL) 182 *protp = PROT_ALL; 183 184 lock = (rw == S_CREATE ? SE_EXCL : SE_SHARED); 185 186 again: 187 if (pp = page_lookup(vp, off, lock)) { 188 /* 189 * In very rare instances, a segkp page may have been 190 * relocated outside of the kernel by the kernel cage 191 * due to the window between page_unlock() and 192 * VOP_PUTPAGE() in segkp_unlock(). Due to the 193 * rareness of these occurances, the solution is to 194 * relocate the page to a P_NORELOC page. 195 */ 196 if (flag_noreloc != 0) { 197 if (!PP_ISNORELOC(pp) && kcage_on) { 198 if (lock != SE_EXCL) { 199 upgrade = 1; 200 if (!page_tryupgrade(pp)) { 201 page_unlock(pp); 202 lock = SE_EXCL; 203 goto again; 204 } 205 } 206 207 if (page_relocate_cage(&pp, &rpp) != 0) 208 panic("swap_getapage: " 209 "page_relocate_cage failed"); 210 211 pp = rpp; 212 } 213 } 214 215 if (pl) { 216 if (upgrade) 217 page_downgrade(pp); 218 219 pl[0] = pp; 220 pl[1] = NULL; 221 } else { 222 page_unlock(pp); 223 } 224 } else { 225 pp = page_create_va(vp, off, PAGESIZE, 226 PG_WAIT | PG_EXCL | flag_noreloc, 227 seg, addr); 228 /* 229 * Someone raced in and created the page after we did the 230 * lookup but before we did the create, so go back and 231 * try to look it up again. 232 */ 233 if (pp == NULL) 234 goto again; 235 if (rw != S_CREATE) { 236 err = swap_getphysname(vp, off, &pvp, &poff); 237 if (pvp) { 238 struct anon *ap; 239 kmutex_t *ahm; 240 241 flags = (pl == NULL ? B_ASYNC|B_READ : B_READ); 242 err = VOP_PAGEIO(pvp, pp, poff, 243 PAGESIZE, flags, cr, NULL); 244 245 if (!err) { 246 ahm = &anonhash_lock[AH_LOCK(vp, off)]; 247 mutex_enter(ahm); 248 249 ap = swap_anon(vp, off); 250 if (ap == NULL) 251 panic("swap_getapage: null anon"); 252 253 if (ap->an_pvp == pvp && 254 ap->an_poff == poff) { 255 swap_phys_free(pvp, poff, 256 PAGESIZE); 257 ap->an_pvp = NULL; 258 ap->an_poff = NULL; 259 hat_setmod(pp); 260 } 261 262 mutex_exit(ahm); 263 } 264 } else { 265 if (!err) 266 pagezero(pp, 0, PAGESIZE); 267 268 /* 269 * If it's a fault ahead, release page_io_lock 270 * and SE_EXCL we grabbed in page_create_va 271 * 272 * If we are here, we haven't called VOP_PAGEIO 273 * and thus calling pvn_read_done(pp, B_READ) 274 * below may mislead that we tried i/o. Besides, 275 * in case of async, pvn_read_done() should 276 * not be called by *getpage() 277 */ 278 if (pl == NULL) { 279 /* 280 * swap_getphysname can return error 281 * only when we are getting called from 282 * swapslot_free which passes non-NULL 283 * pl to VOP_GETPAGE. 284 */ 285 ASSERT(err == 0); 286 page_io_unlock(pp); 287 page_unlock(pp); 288 } 289 } 290 } 291 292 ASSERT(pp != NULL); 293 294 if (err && pl) 295 pvn_read_done(pp, B_ERROR); 296 297 if (!err && pl) 298 pvn_plist_init(pp, pl, plsz, off, PAGESIZE, rw); 299 } 300 TRACE_3(TR_FAC_SWAPFS, TR_SWAPFS_GETAPAGE, 301 "swapfs getapage:pp %p vp %p off %llx", pp, vp, off); 302 return (err); 303 } 304 305 /* 306 * Called from large page anon routines only! This is an ugly hack where 307 * the anon layer directly calls into swapfs with a preallocated large page. 308 * Another method would have been to change to VOP and add an extra arg for 309 * the preallocated large page. This all could be cleaned up later when we 310 * solve the anonymous naming problem and no longer need to loop across of 311 * the VOP in PAGESIZE increments to fill in or initialize a large page as 312 * is done today. I think the latter is better since it avoid a change to 313 * the VOP interface that could later be avoided. 314 */ 315 int 316 swap_getconpage( 317 struct vnode *vp, 318 u_offset_t off, 319 size_t len, 320 uint_t *protp, 321 page_t *pl[], 322 size_t plsz, 323 page_t *conpp, 324 uint_t *pszc, 325 spgcnt_t *nreloc, 326 struct seg *seg, 327 caddr_t addr, 328 enum seg_rw rw, 329 struct cred *cr) 330 { 331 struct page *pp; 332 int err = 0; 333 struct vnode *pvp = NULL; 334 u_offset_t poff; 335 336 ASSERT(len == PAGESIZE); 337 ASSERT(pl != NULL); 338 ASSERT(plsz == PAGESIZE); 339 ASSERT(protp == NULL); 340 ASSERT(nreloc != NULL); 341 ASSERT(!SEG_IS_SEGKP(seg)); /* XXX for now not supported */ 342 SWAPFS_PRINT(SWAP_VOPS, "swap_getconpage: vp %p, off %llx, len %lx\n", 343 vp, off, len, 0, 0); 344 345 /* 346 * If we are not using a preallocated page then we know one already 347 * exists. So just let the old code handle it. 348 */ 349 if (conpp == NULL) { 350 err = swap_getapage(vp, (u_offset_t)off, len, protp, pl, plsz, 351 seg, addr, rw, cr); 352 return (err); 353 } 354 ASSERT(conpp->p_szc != 0); 355 ASSERT(PAGE_EXCL(conpp)); 356 357 358 ASSERT(conpp->p_next == conpp); 359 ASSERT(conpp->p_prev == conpp); 360 ASSERT(!PP_ISAGED(conpp)); 361 ASSERT(!PP_ISFREE(conpp)); 362 363 *nreloc = 0; 364 pp = page_lookup_create(vp, off, SE_SHARED, conpp, nreloc, 0); 365 366 /* 367 * If existing page is found we may need to relocate. 368 */ 369 if (pp != conpp) { 370 ASSERT(rw != S_CREATE); 371 ASSERT(pszc != NULL); 372 ASSERT(PAGE_SHARED(pp)); 373 if (pp->p_szc < conpp->p_szc) { 374 *pszc = pp->p_szc; 375 page_unlock(pp); 376 err = -1; 377 } else if (pp->p_szc > conpp->p_szc && 378 seg->s_szc > conpp->p_szc) { 379 *pszc = MIN(pp->p_szc, seg->s_szc); 380 page_unlock(pp); 381 err = -2; 382 } else { 383 pl[0] = pp; 384 pl[1] = NULL; 385 if (page_pptonum(pp) & 386 (page_get_pagecnt(conpp->p_szc) - 1)) 387 cmn_err(CE_PANIC, "swap_getconpage: no root"); 388 } 389 return (err); 390 } 391 392 ASSERT(PAGE_EXCL(pp)); 393 394 if (*nreloc != 0) { 395 ASSERT(rw != S_CREATE); 396 pl[0] = pp; 397 pl[1] = NULL; 398 return (0); 399 } 400 401 *nreloc = 1; 402 403 /* 404 * If necessary do the page io. 405 */ 406 if (rw != S_CREATE) { 407 /* 408 * Since we are only called now on behalf of an 409 * address space operation it's impossible for 410 * us to fail unlike swap_getapge() which 411 * also gets called from swapslot_free(). 412 */ 413 if (swap_getphysname(vp, off, &pvp, &poff)) { 414 cmn_err(CE_PANIC, 415 "swap_getconpage: swap_getphysname failed!"); 416 } 417 418 if (pvp) { 419 err = VOP_PAGEIO(pvp, pp, poff, PAGESIZE, B_READ, cr, 420 NULL); 421 } else { 422 pagezero(pp, 0, PAGESIZE); 423 } 424 } 425 426 /* 427 * Normally we would let pvn_read_done() destroy 428 * the page on IO error. But since this is a preallocated 429 * page we'll let the anon layer handle it. 430 */ 431 page_io_unlock(pp); 432 if (err != 0) 433 page_hashout(pp, NULL); 434 ASSERT(pp->p_next == pp); 435 ASSERT(pp->p_prev == pp); 436 437 TRACE_3(TR_FAC_SWAPFS, TR_SWAPFS_GETAPAGE, 438 "swapfs getconpage:pp %p vp %p off %llx", pp, vp, off); 439 440 pl[0] = pp; 441 pl[1] = NULL; 442 return (err); 443 } 444 445 /* Async putpage klustering stuff */ 446 int sw_pending_size; 447 extern int klustsize; 448 extern struct async_reqs *sw_getreq(); 449 extern void sw_putreq(struct async_reqs *); 450 extern void sw_putbackreq(struct async_reqs *); 451 extern struct async_reqs *sw_getfree(); 452 extern void sw_putfree(struct async_reqs *); 453 454 static size_t swap_putpagecnt, swap_pagespushed; 455 static size_t swap_otherfail, swap_otherpages; 456 static size_t swap_klustfail, swap_klustpages; 457 static size_t swap_getiofail, swap_getiopages; 458 459 /* 460 * Flags are composed of {B_INVAL, B_DIRTY B_FREE, B_DONTNEED}. 461 * If len == 0, do from off to EOF. 462 */ 463 static int swap_nopage = 0; /* Don't do swap_putpage's if set */ 464 465 /* ARGSUSED */ 466 static int 467 swap_putpage( 468 struct vnode *vp, 469 offset_t off, 470 size_t len, 471 int flags, 472 struct cred *cr, 473 caller_context_t *ct) 474 { 475 page_t *pp; 476 u_offset_t io_off; 477 size_t io_len = 0; 478 int err = 0; 479 struct async_reqs *arg; 480 481 if (swap_nopage) 482 return (0); 483 484 ASSERT(vp->v_count != 0); 485 486 /* 487 * Clear force flag so that p_lckcnt pages are not invalidated. 488 */ 489 flags &= ~B_FORCE; 490 491 SWAPFS_PRINT(SWAP_VOPS, 492 "swap_putpage: vp %p, off %llx len %lx, flags %x\n", 493 (void *)vp, off, len, flags, 0); 494 TRACE_3(TR_FAC_SWAPFS, TR_SWAPFS_PUTPAGE, 495 "swapfs putpage:vp %p off %llx len %ld", (void *)vp, off, len); 496 497 if (vp->v_flag & VNOMAP) 498 return (ENOSYS); 499 500 if (!vn_has_cached_data(vp)) 501 return (0); 502 503 if (len == 0) { 504 if (curproc == proc_pageout) 505 cmn_err(CE_PANIC, "swapfs: pageout can't block"); 506 507 /* Search the entire vp list for pages >= off. */ 508 err = pvn_vplist_dirty(vp, (u_offset_t)off, swap_putapage, 509 flags, cr); 510 } else { 511 u_offset_t eoff; 512 513 /* 514 * Loop over all offsets in the range [off...off + len] 515 * looking for pages to deal with. 516 */ 517 eoff = off + len; 518 for (io_off = (u_offset_t)off; io_off < eoff; 519 io_off += io_len) { 520 /* 521 * If we run out of the async req slot, put the page 522 * now instead of queuing. 523 */ 524 if (flags == (B_ASYNC | B_FREE) && 525 sw_pending_size < klustsize && 526 (arg = sw_getfree())) { 527 /* 528 * If we are clustering, we should allow 529 * pageout to feed us more pages because # of 530 * pushes is limited by # of I/Os, and one 531 * cluster is considered to be one I/O. 532 */ 533 if (pushes) 534 pushes--; 535 536 arg->a_vp = vp; 537 arg->a_off = io_off; 538 arg->a_len = PAGESIZE; 539 arg->a_flags = B_ASYNC | B_FREE; 540 arg->a_cred = kcred; 541 sw_putreq(arg); 542 io_len = PAGESIZE; 543 continue; 544 } 545 /* 546 * If we are not invalidating pages, use the 547 * routine page_lookup_nowait() to prevent 548 * reclaiming them from the free list. 549 */ 550 if ((flags & B_INVAL) || 551 (flags & (B_ASYNC | B_FREE)) == B_FREE) 552 pp = page_lookup(vp, io_off, SE_EXCL); 553 else 554 pp = page_lookup_nowait(vp, io_off, 555 (flags & B_FREE) ? SE_EXCL : SE_SHARED); 556 557 if (pp == NULL || pvn_getdirty(pp, flags) == 0) 558 io_len = PAGESIZE; 559 else { 560 err = swap_putapage(vp, pp, &io_off, &io_len, 561 flags, cr); 562 if (err != 0) 563 break; 564 } 565 } 566 } 567 /* If invalidating, verify all pages on vnode list are gone. */ 568 if (err == 0 && off == 0 && len == 0 && 569 (flags & B_INVAL) && vn_has_cached_data(vp)) { 570 cmn_err(CE_WARN, 571 "swap_putpage: B_INVAL, pages not gone"); 572 } 573 return (err); 574 } 575 576 /* 577 * Write out a single page. 578 * For swapfs this means choose a physical swap slot and write the page 579 * out using VOP_PAGEIO. 580 * In the (B_ASYNC | B_FREE) case we try to find a bunch of other dirty 581 * swapfs pages, a bunch of contiguous swap slots and then write them 582 * all out in one clustered i/o. 583 */ 584 /*ARGSUSED*/ 585 static int 586 swap_putapage( 587 struct vnode *vp, 588 page_t *pp, 589 u_offset_t *offp, 590 size_t *lenp, 591 int flags, 592 struct cred *cr) 593 { 594 int err; 595 struct vnode *pvp; 596 u_offset_t poff, off; 597 u_offset_t doff; 598 size_t dlen; 599 size_t klsz = 0; 600 u_offset_t klstart = 0; 601 struct vnode *klvp = NULL; 602 page_t *pplist; 603 se_t se; 604 struct async_reqs *arg; 605 size_t swap_klustsize; 606 607 /* 608 * This check is added for callers who access swap_putpage with len = 0. 609 * swap_putpage calls swap_putapage page-by-page via pvn_vplist_dirty. 610 * And it's necessary to do the same queuing if users have the same 611 * B_ASYNC|B_FREE flags on. 612 */ 613 if (flags == (B_ASYNC | B_FREE) && 614 sw_pending_size < klustsize && (arg = sw_getfree())) { 615 616 hat_setmod(pp); 617 page_io_unlock(pp); 618 page_unlock(pp); 619 620 arg->a_vp = vp; 621 arg->a_off = pp->p_offset; 622 arg->a_len = PAGESIZE; 623 arg->a_flags = B_ASYNC | B_FREE; 624 arg->a_cred = kcred; 625 sw_putreq(arg); 626 627 return (0); 628 } 629 630 SWAPFS_PRINT(SWAP_PUTP, 631 "swap_putapage: pp %p, vp %p, off %llx, flags %x\n", 632 pp, vp, pp->p_offset, flags, 0); 633 634 ASSERT(PAGE_LOCKED(pp)); 635 636 off = pp->p_offset; 637 638 doff = off; 639 dlen = PAGESIZE; 640 641 if (err = swap_newphysname(vp, off, &doff, &dlen, &pvp, &poff)) { 642 err = (flags == (B_ASYNC | B_FREE) ? ENOMEM : 0); 643 hat_setmod(pp); 644 page_io_unlock(pp); 645 page_unlock(pp); 646 goto out; 647 } 648 649 klvp = pvp; 650 klstart = poff; 651 pplist = pp; 652 /* 653 * If this is ASYNC | FREE and we've accumulated a bunch of such 654 * pending requests, kluster. 655 */ 656 if (flags == (B_ASYNC | B_FREE)) 657 swap_klustsize = klustsize; 658 else 659 swap_klustsize = PAGESIZE; 660 se = (flags & B_FREE ? SE_EXCL : SE_SHARED); 661 klsz = PAGESIZE; 662 while (klsz < swap_klustsize) { 663 if ((arg = sw_getreq()) == NULL) { 664 swap_getiofail++; 665 swap_getiopages += btop(klsz); 666 break; 667 } 668 ASSERT(vn_matchops(arg->a_vp, swap_vnodeops)); 669 vp = arg->a_vp; 670 off = arg->a_off; 671 672 if ((pp = page_lookup_nowait(vp, off, se)) == NULL) { 673 swap_otherfail++; 674 swap_otherpages += btop(klsz); 675 sw_putfree(arg); 676 break; 677 } 678 if (pvn_getdirty(pp, flags | B_DELWRI) == 0) { 679 sw_putfree(arg); 680 continue; 681 } 682 /* Get new physical backing store for the page */ 683 doff = off; 684 dlen = PAGESIZE; 685 if (err = swap_newphysname(vp, off, &doff, &dlen, 686 &pvp, &poff)) { 687 swap_otherfail++; 688 swap_otherpages += btop(klsz); 689 hat_setmod(pp); 690 page_io_unlock(pp); 691 page_unlock(pp); 692 sw_putbackreq(arg); 693 break; 694 } 695 /* Try to cluster new physical name with previous ones */ 696 if (klvp == pvp && poff == klstart + klsz) { 697 klsz += PAGESIZE; 698 page_add(&pplist, pp); 699 pplist = pplist->p_next; 700 sw_putfree(arg); 701 } else if (klvp == pvp && poff == klstart - PAGESIZE) { 702 klsz += PAGESIZE; 703 klstart -= PAGESIZE; 704 page_add(&pplist, pp); 705 sw_putfree(arg); 706 } else { 707 swap_klustfail++; 708 swap_klustpages += btop(klsz); 709 hat_setmod(pp); 710 page_io_unlock(pp); 711 page_unlock(pp); 712 sw_putbackreq(arg); 713 break; 714 } 715 } 716 717 err = VOP_PAGEIO(klvp, pplist, klstart, klsz, 718 B_WRITE | flags, cr, NULL); 719 720 if ((flags & B_ASYNC) == 0) 721 pvn_write_done(pp, ((err) ? B_ERROR : 0) | B_WRITE | flags); 722 723 /* Statistics */ 724 if (!err) { 725 swap_putpagecnt++; 726 swap_pagespushed += btop(klsz); 727 } 728 out: 729 TRACE_4(TR_FAC_SWAPFS, TR_SWAPFS_PUTAPAGE, 730 "swapfs putapage:vp %p klvp %p, klstart %lx, klsz %lx", 731 vp, klvp, klstart, klsz); 732 if (err && err != ENOMEM) 733 cmn_err(CE_WARN, "swapfs_putapage: err %d\n", err); 734 if (lenp) 735 *lenp = PAGESIZE; 736 return (err); 737 } 738 739 static void 740 swap_dispose( 741 vnode_t *vp, 742 page_t *pp, 743 int fl, 744 int dn, 745 cred_t *cr, 746 caller_context_t *ct) 747 { 748 int err; 749 u_offset_t off = pp->p_offset; 750 vnode_t *pvp; 751 u_offset_t poff; 752 753 ASSERT(PAGE_EXCL(pp)); 754 755 /* 756 * The caller will free/invalidate large page in one shot instead of 757 * one small page at a time. 758 */ 759 if (pp->p_szc != 0) { 760 page_unlock(pp); 761 return; 762 } 763 764 err = swap_getphysname(vp, off, &pvp, &poff); 765 if (!err && pvp != NULL) 766 VOP_DISPOSE(pvp, pp, fl, dn, cr, ct); 767 else 768 fs_dispose(vp, pp, fl, dn, cr, ct); 769 } 770