1 /* $NetBSD: nfs_bio.c,v 1.122 2004/10/26 04:34:46 yamt Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_bio.c 8.9 (Berkeley) 3/30/95 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: nfs_bio.c,v 1.122 2004/10/26 04:34:46 yamt Exp $"); 39 40 #include "opt_nfs.h" 41 #include "opt_ddb.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/resourcevar.h> 46 #include <sys/signalvar.h> 47 #include <sys/proc.h> 48 #include <sys/buf.h> 49 #include <sys/vnode.h> 50 #include <sys/mount.h> 51 #include <sys/kernel.h> 52 #include <sys/namei.h> 53 #include <sys/dirent.h> 54 #include <sys/malloc.h> 55 56 #include <uvm/uvm_extern.h> 57 #include <uvm/uvm.h> 58 59 #include <nfs/rpcv2.h> 60 #include <nfs/nfsproto.h> 61 #include <nfs/nfs.h> 62 #include <nfs/nfsmount.h> 63 #include <nfs/nqnfs.h> 64 #include <nfs/nfsnode.h> 65 #include <nfs/nfs_var.h> 66 67 extern int nfs_numasync; 68 extern int nfs_commitsize; 69 extern struct nfsstats nfsstats; 70 71 static int nfs_doio_read __P((struct buf *, struct uio *)); 72 static int nfs_doio_write __P((struct buf *, struct uio *)); 73 static int nfs_doio_phys __P((struct buf *, struct uio *)); 74 75 /* 76 * Vnode op for read using bio 77 * Any similarity to readip() is purely coincidental 78 */ 79 int 80 nfs_bioread(vp, uio, ioflag, cred, cflag) 81 struct vnode *vp; 82 struct uio *uio; 83 int ioflag, cflag; 84 struct ucred *cred; 85 { 86 struct nfsnode *np = VTONFS(vp); 87 struct buf *bp = NULL, *rabp; 88 struct vattr vattr; 89 struct proc *p; 90 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 91 struct nfsdircache *ndp = NULL, *nndp = NULL; 92 caddr_t baddr, ep, edp; 93 int got_buf = 0, error = 0, n = 0, on = 0, en, enn; 94 int enough = 0; 95 struct dirent *dp, *pdp; 96 off_t curoff = 0; 97 98 #ifdef DIAGNOSTIC 99 if (uio->uio_rw != UIO_READ) 100 panic("nfs_read mode"); 101 #endif 102 if (uio->uio_resid == 0) 103 return (0); 104 if (vp->v_type != VDIR && uio->uio_offset < 0) 105 return (EINVAL); 106 p = uio->uio_procp; 107 #ifndef NFS_V2_ONLY 108 if ((nmp->nm_flag & NFSMNT_NFSV3) && 109 !(nmp->nm_iflag & NFSMNT_GOTFSINFO)) 110 (void)nfs_fsinfo(nmp, vp, cred, p); 111 #endif 112 if (vp->v_type != VDIR && 113 (uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize) 114 return (EFBIG); 115 116 /* 117 * For nfs, cache consistency can only be maintained approximately. 118 * Although RFC1094 does not specify the criteria, the following is 119 * believed to be compatible with the reference port. 120 * For nqnfs, full cache consistency is maintained within the loop. 121 * For nfs: 122 * If the file's modify time on the server has changed since the 123 * last read rpc or you have written to the file, 124 * you may have lost data cache consistency with the 125 * server, so flush all of the file's data out of the cache. 126 * Then force a getattr rpc to ensure that you have up to date 127 * attributes. 128 * NB: This implies that cache data can be read when up to 129 * NFS_ATTRTIMEO seconds out of date. If you find that you need current 130 * attributes this could be forced by setting n_attrstamp to 0 before 131 * the VOP_GETATTR() call. 132 */ 133 134 if ((nmp->nm_flag & NFSMNT_NQNFS) == 0 && vp->v_type != VLNK) { 135 if (np->n_flag & NMODIFIED) { 136 if (vp->v_type != VREG) { 137 if (vp->v_type != VDIR) 138 panic("nfs: bioread, not dir"); 139 nfs_invaldircache(vp, 0); 140 np->n_direofoffset = 0; 141 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 142 if (error) 143 return (error); 144 } 145 NFS_INVALIDATE_ATTRCACHE(np); 146 error = VOP_GETATTR(vp, &vattr, cred, p); 147 if (error) 148 return (error); 149 np->n_mtime = vattr.va_mtime; 150 } else { 151 error = VOP_GETATTR(vp, &vattr, cred, p); 152 if (error) 153 return (error); 154 if (timespeccmp(&np->n_mtime, &vattr.va_mtime, !=)) { 155 if (vp->v_type == VDIR) { 156 nfs_invaldircache(vp, 0); 157 np->n_direofoffset = 0; 158 } 159 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 160 if (error) 161 return (error); 162 np->n_mtime = vattr.va_mtime; 163 } 164 } 165 } 166 167 do { 168 #ifndef NFS_V2_ONLY 169 /* 170 * Get a valid lease. If cached data is stale, flush it. 171 */ 172 if (nmp->nm_flag & NFSMNT_NQNFS) { 173 if (NQNFS_CKINVALID(vp, np, ND_READ)) { 174 do { 175 error = nqnfs_getlease(vp, ND_READ, cred, p); 176 } while (error == NQNFS_EXPIRED); 177 if (error) 178 return (error); 179 if (np->n_lrev != np->n_brev || 180 (np->n_flag & NQNFSNONCACHE) || 181 ((np->n_flag & NMODIFIED) && vp->v_type == VDIR)) { 182 if (vp->v_type == VDIR) { 183 nfs_invaldircache(vp, 0); 184 np->n_direofoffset = 0; 185 } 186 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 187 if (error) 188 return (error); 189 np->n_brev = np->n_lrev; 190 } 191 } else if (vp->v_type == VDIR && (np->n_flag & NMODIFIED)) { 192 nfs_invaldircache(vp, 0); 193 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 194 np->n_direofoffset = 0; 195 if (error) 196 return (error); 197 } 198 } 199 #endif 200 /* 201 * Don't cache symlinks. 202 */ 203 if (np->n_flag & NQNFSNONCACHE 204 || ((vp->v_flag & VROOT) && vp->v_type == VLNK)) { 205 switch (vp->v_type) { 206 case VREG: 207 return (nfs_readrpc(vp, uio)); 208 case VLNK: 209 return (nfs_readlinkrpc(vp, uio, cred)); 210 case VDIR: 211 break; 212 default: 213 printf(" NQNFSNONCACHE: type %x unexpected\n", 214 vp->v_type); 215 }; 216 } 217 baddr = (caddr_t)0; 218 switch (vp->v_type) { 219 case VREG: 220 nfsstats.biocache_reads++; 221 222 error = 0; 223 if (uio->uio_offset >= np->n_size) { 224 break; 225 } 226 while (uio->uio_resid > 0) { 227 void *win; 228 vsize_t bytelen = MIN(np->n_size - uio->uio_offset, 229 uio->uio_resid); 230 231 if (bytelen == 0) 232 break; 233 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 234 &bytelen, UBC_READ); 235 error = uiomove(win, bytelen, uio); 236 ubc_release(win, 0); 237 if (error) { 238 break; 239 } 240 } 241 n = 0; 242 break; 243 244 case VLNK: 245 nfsstats.biocache_readlinks++; 246 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, p); 247 if (!bp) 248 return (EINTR); 249 if ((bp->b_flags & B_DONE) == 0) { 250 bp->b_flags |= B_READ; 251 error = nfs_doio(bp, p); 252 if (error) { 253 brelse(bp); 254 return (error); 255 } 256 } 257 n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid); 258 got_buf = 1; 259 on = 0; 260 break; 261 case VDIR: 262 diragain: 263 nfsstats.biocache_readdirs++; 264 ndp = nfs_searchdircache(vp, uio->uio_offset, 265 (nmp->nm_flag & NFSMNT_XLATECOOKIE), 0); 266 if (!ndp) { 267 /* 268 * We've been handed a cookie that is not 269 * in the cache. If we're not translating 270 * 32 <-> 64, it may be a value that was 271 * flushed out of the cache because it grew 272 * too big. Let the server judge if it's 273 * valid or not. In the translation case, 274 * we have no way of validating this value, 275 * so punt. 276 */ 277 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) 278 return (EINVAL); 279 ndp = nfs_enterdircache(vp, uio->uio_offset, 280 uio->uio_offset, 0, 0); 281 } 282 283 if (uio->uio_offset != 0 && 284 ndp->dc_cookie == np->n_direofoffset) { 285 nfs_putdircache(np, ndp); 286 nfsstats.direofcache_hits++; 287 return (0); 288 } 289 290 bp = nfs_getcacheblk(vp, NFSDC_BLKNO(ndp), NFS_DIRBLKSIZ, p); 291 if (!bp) 292 return (EINTR); 293 if ((bp->b_flags & B_DONE) == 0) { 294 bp->b_flags |= B_READ; 295 bp->b_dcookie = ndp->dc_blkcookie; 296 error = nfs_doio(bp, p); 297 if (error) { 298 /* 299 * Yuck! The directory has been modified on the 300 * server. Punt and let the userland code 301 * deal with it. 302 */ 303 nfs_putdircache(np, ndp); 304 brelse(bp); 305 if (error == NFSERR_BAD_COOKIE) { 306 nfs_invaldircache(vp, 0); 307 nfs_vinvalbuf(vp, 0, cred, p, 1); 308 error = EINVAL; 309 } 310 return (error); 311 } 312 } 313 314 /* 315 * Just return if we hit EOF right away with this 316 * block. Always check here, because direofoffset 317 * may have been set by an nfsiod since the last 318 * check. 319 */ 320 if (np->n_direofoffset != 0 && 321 ndp->dc_blkcookie == np->n_direofoffset) { 322 nfs_putdircache(np, ndp); 323 brelse(bp); 324 return (0); 325 } 326 327 /* 328 * Find the entry we were looking for in the block. 329 */ 330 331 en = ndp->dc_entry; 332 333 pdp = dp = (struct dirent *)bp->b_data; 334 edp = bp->b_data + bp->b_bcount - bp->b_resid; 335 enn = 0; 336 while (enn < en && (caddr_t)dp < edp) { 337 pdp = dp; 338 dp = (struct dirent *)((caddr_t)dp + dp->d_reclen); 339 enn++; 340 } 341 342 /* 343 * If the entry number was bigger than the number of 344 * entries in the block, or the cookie of the previous 345 * entry doesn't match, the directory cache is 346 * stale. Flush it and try again (i.e. go to 347 * the server). 348 */ 349 if ((caddr_t)dp >= edp || (caddr_t)dp + dp->d_reclen > edp || 350 (en > 0 && NFS_GETCOOKIE(pdp) != ndp->dc_cookie)) { 351 #ifdef DEBUG 352 printf("invalid cache: %p %p %p off %lx %lx\n", 353 pdp, dp, edp, 354 (unsigned long)uio->uio_offset, 355 (unsigned long)NFS_GETCOOKIE(pdp)); 356 #endif 357 nfs_putdircache(np, ndp); 358 brelse(bp); 359 nfs_invaldircache(vp, 0); 360 nfs_vinvalbuf(vp, 0, cred, p, 0); 361 goto diragain; 362 } 363 364 on = (caddr_t)dp - bp->b_data; 365 366 /* 367 * Cache all entries that may be exported to the 368 * user, as they may be thrown back at us. The 369 * NFSBIO_CACHECOOKIES flag indicates that all 370 * entries are being 'exported', so cache them all. 371 */ 372 373 if (en == 0 && pdp == dp) { 374 dp = (struct dirent *) 375 ((caddr_t)dp + dp->d_reclen); 376 enn++; 377 } 378 379 if (uio->uio_resid < (bp->b_bcount - bp->b_resid - on)) { 380 n = uio->uio_resid; 381 enough = 1; 382 } else 383 n = bp->b_bcount - bp->b_resid - on; 384 385 ep = bp->b_data + on + n; 386 387 /* 388 * Find last complete entry to copy, caching entries 389 * (if requested) as we go. 390 */ 391 392 while ((caddr_t)dp < ep && (caddr_t)dp + dp->d_reclen <= ep) { 393 if (cflag & NFSBIO_CACHECOOKIES) { 394 nndp = nfs_enterdircache(vp, NFS_GETCOOKIE(pdp), 395 ndp->dc_blkcookie, enn, bp->b_lblkno); 396 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) { 397 NFS_STASHCOOKIE32(pdp, 398 nndp->dc_cookie32); 399 } 400 nfs_putdircache(np, nndp); 401 } 402 pdp = dp; 403 dp = (struct dirent *)((caddr_t)dp + dp->d_reclen); 404 enn++; 405 } 406 nfs_putdircache(np, ndp); 407 408 /* 409 * If the last requested entry was not the last in the 410 * buffer (happens if NFS_DIRFRAGSIZ < NFS_DIRBLKSIZ), 411 * cache the cookie of the last requested one, and 412 * set of the offset to it. 413 */ 414 415 if ((on + n) < bp->b_bcount - bp->b_resid) { 416 curoff = NFS_GETCOOKIE(pdp); 417 nndp = nfs_enterdircache(vp, curoff, ndp->dc_blkcookie, 418 enn, bp->b_lblkno); 419 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) { 420 NFS_STASHCOOKIE32(pdp, nndp->dc_cookie32); 421 curoff = nndp->dc_cookie32; 422 } 423 nfs_putdircache(np, nndp); 424 } else 425 curoff = bp->b_dcookie; 426 427 /* 428 * Always cache the entry for the next block, 429 * so that readaheads can use it. 430 */ 431 nndp = nfs_enterdircache(vp, bp->b_dcookie, bp->b_dcookie, 0,0); 432 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) { 433 if (curoff == bp->b_dcookie) { 434 NFS_STASHCOOKIE32(pdp, nndp->dc_cookie32); 435 curoff = nndp->dc_cookie32; 436 } 437 } 438 439 n = ((caddr_t)pdp + pdp->d_reclen) - (bp->b_data + on); 440 441 /* 442 * If not eof and read aheads are enabled, start one. 443 * (You need the current block first, so that you have the 444 * directory offset cookie of the next block.) 445 */ 446 if (nfs_numasync > 0 && nmp->nm_readahead > 0 && 447 np->n_direofoffset == 0 && !(np->n_flag & NQNFSNONCACHE)) { 448 rabp = nfs_getcacheblk(vp, NFSDC_BLKNO(nndp), 449 NFS_DIRBLKSIZ, p); 450 if (rabp) { 451 if ((rabp->b_flags & (B_DONE | B_DELWRI)) == 0) { 452 rabp->b_dcookie = nndp->dc_cookie; 453 rabp->b_flags |= (B_READ | B_ASYNC); 454 if (nfs_asyncio(rabp)) { 455 rabp->b_flags |= B_INVAL; 456 brelse(rabp); 457 } 458 } else 459 brelse(rabp); 460 } 461 } 462 nfs_putdircache(np, nndp); 463 got_buf = 1; 464 break; 465 default: 466 printf(" nfsbioread: type %x unexpected\n",vp->v_type); 467 break; 468 } 469 470 if (n > 0) { 471 if (!baddr) 472 baddr = bp->b_data; 473 error = uiomove(baddr + on, (int)n, uio); 474 } 475 switch (vp->v_type) { 476 case VREG: 477 break; 478 case VLNK: 479 n = 0; 480 break; 481 case VDIR: 482 if (np->n_flag & NQNFSNONCACHE) 483 bp->b_flags |= B_INVAL; 484 uio->uio_offset = curoff; 485 if (enough) 486 n = 0; 487 break; 488 default: 489 printf(" nfsbioread: type %x unexpected\n",vp->v_type); 490 } 491 if (got_buf) 492 brelse(bp); 493 } while (error == 0 && uio->uio_resid > 0 && n > 0); 494 return (error); 495 } 496 497 /* 498 * Vnode op for write using bio 499 */ 500 int 501 nfs_write(v) 502 void *v; 503 { 504 struct vop_write_args /* { 505 struct vnode *a_vp; 506 struct uio *a_uio; 507 int a_ioflag; 508 struct ucred *a_cred; 509 } */ *ap = v; 510 struct uio *uio = ap->a_uio; 511 struct proc *p = uio->uio_procp; 512 struct vnode *vp = ap->a_vp; 513 struct nfsnode *np = VTONFS(vp); 514 struct ucred *cred = ap->a_cred; 515 int ioflag = ap->a_ioflag; 516 struct vattr vattr; 517 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 518 void *win; 519 voff_t oldoff, origoff; 520 vsize_t bytelen; 521 int error = 0; 522 int extended = 0, wrotedta = 0; 523 524 #ifdef DIAGNOSTIC 525 if (uio->uio_rw != UIO_WRITE) 526 panic("nfs_write mode"); 527 if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) 528 panic("nfs_write proc"); 529 #endif 530 if (vp->v_type != VREG) 531 return (EIO); 532 if (np->n_flag & NWRITEERR) { 533 np->n_flag &= ~NWRITEERR; 534 return (np->n_error); 535 } 536 #ifndef NFS_V2_ONLY 537 if ((nmp->nm_flag & NFSMNT_NFSV3) && 538 !(nmp->nm_iflag & NFSMNT_GOTFSINFO)) 539 (void)nfs_fsinfo(nmp, vp, cred, p); 540 #endif 541 if (ioflag & (IO_APPEND | IO_SYNC)) { 542 if (np->n_flag & NMODIFIED) { 543 NFS_INVALIDATE_ATTRCACHE(np); 544 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 545 if (error) 546 return (error); 547 } 548 if (ioflag & IO_APPEND) { 549 NFS_INVALIDATE_ATTRCACHE(np); 550 error = VOP_GETATTR(vp, &vattr, cred, p); 551 if (error) 552 return (error); 553 uio->uio_offset = np->n_size; 554 } 555 } 556 if (uio->uio_offset < 0) 557 return (EINVAL); 558 if ((uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize) 559 return (EFBIG); 560 if (uio->uio_resid == 0) 561 return (0); 562 /* 563 * Maybe this should be above the vnode op call, but so long as 564 * file servers have no limits, i don't think it matters 565 */ 566 if (p && uio->uio_offset + uio->uio_resid > 567 p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 568 psignal(p, SIGXFSZ); 569 return (EFBIG); 570 } 571 572 if ((np->n_flag & NQNFSNONCACHE) && uio->uio_iovcnt == 1) { 573 int iomode = NFSV3WRITE_FILESYNC; 574 boolean_t stalewriteverf = FALSE; 575 576 lockmgr(&nmp->nm_writeverflock, LK_SHARED, NULL); 577 error = nfs_writerpc(vp, uio, &iomode, FALSE, &stalewriteverf); 578 lockmgr(&nmp->nm_writeverflock, LK_RELEASE, NULL); 579 if (stalewriteverf) 580 nfs_clearcommit(vp->v_mount); 581 return (error); 582 } 583 584 origoff = uio->uio_offset; 585 do { 586 boolean_t extending; /* if we are extending whole pages */ 587 u_quad_t oldsize; 588 oldoff = uio->uio_offset; 589 bytelen = uio->uio_resid; 590 591 #ifndef NFS_V2_ONLY 592 /* 593 * Check for a valid write lease. 594 */ 595 if ((nmp->nm_flag & NFSMNT_NQNFS) && 596 NQNFS_CKINVALID(vp, np, ND_WRITE)) { 597 do { 598 error = nqnfs_getlease(vp, ND_WRITE, cred, p); 599 } while (error == NQNFS_EXPIRED); 600 if (error) 601 return (error); 602 if (np->n_lrev != np->n_brev || 603 (np->n_flag & NQNFSNONCACHE)) { 604 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 605 if (error) 606 return (error); 607 np->n_brev = np->n_lrev; 608 } 609 } 610 #endif 611 nfsstats.biocache_writes++; 612 613 oldsize = np->n_size; 614 np->n_flag |= NMODIFIED; 615 if (np->n_size < uio->uio_offset + bytelen) { 616 np->n_size = uio->uio_offset + bytelen; 617 } 618 extending = ((uio->uio_offset & PAGE_MASK) == 0 && 619 (bytelen & PAGE_MASK) == 0 && 620 uio->uio_offset >= vp->v_size); 621 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, &bytelen, 622 UBC_WRITE | (extending ? UBC_FAULTBUSY : 0)); 623 error = uiomove(win, bytelen, uio); 624 ubc_release(win, 0); 625 if (error) { 626 if (extending) { 627 /* 628 * backout size and free pages past eof. 629 */ 630 np->n_size = oldsize; 631 simple_lock(&vp->v_interlock); 632 (void)VOP_PUTPAGES(vp, round_page(vp->v_size), 633 0, PGO_SYNCIO | PGO_FREE); 634 } 635 break; 636 } 637 wrotedta = 1; 638 639 /* 640 * update UVM's notion of the size now that we've 641 * copied the data into the vnode's pages. 642 */ 643 644 if (vp->v_size < uio->uio_offset) { 645 uvm_vnp_setsize(vp, uio->uio_offset); 646 extended = 1; 647 } 648 649 if ((oldoff & ~(nmp->nm_wsize - 1)) != 650 (uio->uio_offset & ~(nmp->nm_wsize - 1))) { 651 simple_lock(&vp->v_interlock); 652 error = VOP_PUTPAGES(vp, 653 trunc_page(oldoff & ~(nmp->nm_wsize - 1)), 654 round_page((uio->uio_offset + nmp->nm_wsize - 1) & 655 ~(nmp->nm_wsize - 1)), PGO_CLEANIT); 656 } 657 } while (uio->uio_resid > 0); 658 if (wrotedta) 659 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); 660 if ((np->n_flag & NQNFSNONCACHE) || (ioflag & IO_SYNC)) { 661 simple_lock(&vp->v_interlock); 662 error = VOP_PUTPAGES(vp, 663 trunc_page(origoff & ~(nmp->nm_wsize - 1)), 664 round_page((uio->uio_offset + nmp->nm_wsize - 1) & 665 ~(nmp->nm_wsize - 1)), 666 PGO_CLEANIT | PGO_SYNCIO); 667 } 668 return error; 669 } 670 671 /* 672 * Get an nfs cache block. 673 * Allocate a new one if the block isn't currently in the cache 674 * and return the block marked busy. If the calling process is 675 * interrupted by a signal for an interruptible mount point, return 676 * NULL. 677 */ 678 struct buf * 679 nfs_getcacheblk(vp, bn, size, p) 680 struct vnode *vp; 681 daddr_t bn; 682 int size; 683 struct proc *p; 684 { 685 struct buf *bp; 686 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 687 688 if (nmp->nm_flag & NFSMNT_INT) { 689 bp = getblk(vp, bn, size, PCATCH, 0); 690 while (bp == NULL) { 691 if (nfs_sigintr(nmp, NULL, p)) 692 return (NULL); 693 bp = getblk(vp, bn, size, 0, 2 * hz); 694 } 695 } else 696 bp = getblk(vp, bn, size, 0, 0); 697 return (bp); 698 } 699 700 /* 701 * Flush and invalidate all dirty buffers. If another process is already 702 * doing the flush, just wait for completion. 703 */ 704 int 705 nfs_vinvalbuf(vp, flags, cred, p, intrflg) 706 struct vnode *vp; 707 int flags; 708 struct ucred *cred; 709 struct proc *p; 710 int intrflg; 711 { 712 struct nfsnode *np = VTONFS(vp); 713 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 714 int error = 0, slpflag, slptimeo; 715 716 if ((nmp->nm_flag & NFSMNT_INT) == 0) 717 intrflg = 0; 718 if (intrflg) { 719 slpflag = PCATCH; 720 slptimeo = 2 * hz; 721 } else { 722 slpflag = 0; 723 slptimeo = 0; 724 } 725 /* 726 * First wait for any other process doing a flush to complete. 727 */ 728 simple_lock(&vp->v_interlock); 729 while (np->n_flag & NFLUSHINPROG) { 730 np->n_flag |= NFLUSHWANT; 731 error = ltsleep(&np->n_flag, PRIBIO + 2, "nfsvinval", 732 slptimeo, &vp->v_interlock); 733 if (error && intrflg && nfs_sigintr(nmp, NULL, p)) { 734 simple_unlock(&vp->v_interlock); 735 return EINTR; 736 } 737 } 738 739 /* 740 * Now, flush as required. 741 */ 742 np->n_flag |= NFLUSHINPROG; 743 simple_unlock(&vp->v_interlock); 744 error = vinvalbuf(vp, flags, cred, p, slpflag, 0); 745 while (error) { 746 if (intrflg && nfs_sigintr(nmp, NULL, p)) { 747 error = EINTR; 748 break; 749 } 750 error = vinvalbuf(vp, flags, cred, p, 0, slptimeo); 751 } 752 simple_lock(&vp->v_interlock); 753 if (error == 0) 754 np->n_flag &= ~NMODIFIED; 755 np->n_flag &= ~NFLUSHINPROG; 756 if (np->n_flag & NFLUSHWANT) { 757 np->n_flag &= ~NFLUSHWANT; 758 wakeup(&np->n_flag); 759 } 760 simple_unlock(&vp->v_interlock); 761 return error; 762 } 763 764 /* 765 * Initiate asynchronous I/O. Return an error if no nfsiods are available. 766 * This is mainly to avoid queueing async I/O requests when the nfsiods 767 * are all hung on a dead server. 768 */ 769 770 int 771 nfs_asyncio(bp) 772 struct buf *bp; 773 { 774 int i; 775 struct nfsmount *nmp; 776 int gotiod, slpflag = 0, slptimeo = 0, error; 777 778 if (nfs_numasync == 0) 779 return (EIO); 780 781 nmp = VFSTONFS(bp->b_vp->v_mount); 782 again: 783 if (nmp->nm_flag & NFSMNT_INT) 784 slpflag = PCATCH; 785 gotiod = FALSE; 786 787 /* 788 * Find a free iod to process this request. 789 */ 790 791 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 792 struct nfs_iod *iod = &nfs_asyncdaemon[i]; 793 794 simple_lock(&iod->nid_slock); 795 if (iod->nid_want) { 796 /* 797 * Found one, so wake it up and tell it which 798 * mount to process. 799 */ 800 iod->nid_want = NULL; 801 iod->nid_mount = nmp; 802 wakeup(&iod->nid_want); 803 simple_lock(&nmp->nm_slock); 804 simple_unlock(&iod->nid_slock); 805 nmp->nm_bufqiods++; 806 gotiod = TRUE; 807 break; 808 } 809 simple_unlock(&iod->nid_slock); 810 } 811 812 /* 813 * If none are free, we may already have an iod working on this mount 814 * point. If so, it will process our request. 815 */ 816 817 if (!gotiod) { 818 simple_lock(&nmp->nm_slock); 819 if (nmp->nm_bufqiods > 0) 820 gotiod = TRUE; 821 } 822 823 LOCK_ASSERT(simple_lock_held(&nmp->nm_slock)); 824 825 /* 826 * If we have an iod which can process the request, then queue 827 * the buffer. However, even if we have an iod, do not initiate 828 * queue cleaning if curproc is the pageout daemon. if the NFS mount 829 * is via local loopback, we may put curproc (pagedaemon) to sleep 830 * waiting for the writes to complete. But the server (ourself) 831 * may block the write, waiting for its (ie., our) pagedaemon 832 * to produce clean pages to handle the write: deadlock. 833 * XXX: start non-loopback mounts straight away? If "lots free", 834 * let pagedaemon start loopback writes anyway? 835 */ 836 if (gotiod) { 837 838 /* 839 * Ensure that the queue never grows too large. 840 */ 841 if (curproc == uvm.pagedaemon_proc) { 842 /* Enque for later, to avoid free-page deadlock */ 843 (void) 0; 844 } else while (nmp->nm_bufqlen >= 2*nfs_numasync) { 845 nmp->nm_bufqwant = TRUE; 846 error = ltsleep(&nmp->nm_bufq, 847 slpflag | PRIBIO | PNORELOCK, 848 "nfsaio", slptimeo, &nmp->nm_slock); 849 if (error) { 850 if (nfs_sigintr(nmp, NULL, curproc)) 851 return (EINTR); 852 if (slpflag == PCATCH) { 853 slpflag = 0; 854 slptimeo = 2 * hz; 855 } 856 } 857 858 /* 859 * We might have lost our iod while sleeping, 860 * so check and loop if nescessary. 861 */ 862 863 if (nmp->nm_bufqiods == 0) 864 goto again; 865 866 simple_lock(&nmp->nm_slock); 867 } 868 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist); 869 nmp->nm_bufqlen++; 870 simple_unlock(&nmp->nm_slock); 871 return (0); 872 } 873 simple_unlock(&nmp->nm_slock); 874 875 /* 876 * All the iods are busy on other mounts, so return EIO to 877 * force the caller to process the i/o synchronously. 878 */ 879 880 return (EIO); 881 } 882 883 /* 884 * nfs_doio for read. 885 */ 886 static int 887 nfs_doio_read(bp, uiop) 888 struct buf *bp; 889 struct uio *uiop; 890 { 891 struct vnode *vp = bp->b_vp; 892 struct nfsnode *np = VTONFS(vp); 893 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 894 int error = 0; 895 896 uiop->uio_rw = UIO_READ; 897 switch (vp->v_type) { 898 case VREG: 899 nfsstats.read_bios++; 900 error = nfs_readrpc(vp, uiop); 901 if (!error && uiop->uio_resid) { 902 int diff, len; 903 904 /* 905 * If uio_resid > 0, there is a hole in the file and 906 * no writes after the hole have been pushed to 907 * the server yet or the file has been truncated 908 * on the server. 909 * Just zero fill the rest of the valid area. 910 */ 911 912 KASSERT(vp->v_size >= 913 uiop->uio_offset + uiop->uio_resid); 914 diff = bp->b_bcount - uiop->uio_resid; 915 len = uiop->uio_resid; 916 memset((char *)bp->b_data + diff, 0, len); 917 } 918 if (uiop->uio_procp && (vp->v_flag & VTEXT) && 919 (((nmp->nm_flag & NFSMNT_NQNFS) && 920 NQNFS_CKINVALID(vp, np, ND_READ) && 921 np->n_lrev != np->n_brev) || 922 (!(nmp->nm_flag & NFSMNT_NQNFS) && 923 timespeccmp(&np->n_mtime, &np->n_vattr->va_mtime, !=)))) { 924 uprintf("Process killed due to " 925 "text file modification\n"); 926 psignal(uiop->uio_procp, SIGKILL); 927 #if 0 /* XXX NJWLWP */ 928 uiop->uio_procp->p_holdcnt++; 929 #endif 930 } 931 break; 932 case VLNK: 933 KASSERT(uiop->uio_offset == (off_t)0); 934 nfsstats.readlink_bios++; 935 error = nfs_readlinkrpc(vp, uiop, curproc->p_ucred); 936 break; 937 case VDIR: 938 nfsstats.readdir_bios++; 939 uiop->uio_offset = bp->b_dcookie; 940 #ifndef NFS_V2_ONLY 941 if (nmp->nm_flag & NFSMNT_RDIRPLUS) { 942 error = nfs_readdirplusrpc(vp, uiop, np->n_rcred); 943 if (error == NFSERR_NOTSUPP) 944 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 945 } 946 #else 947 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 948 #endif 949 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0) 950 error = nfs_readdirrpc(vp, uiop, np->n_rcred); 951 if (!error) { 952 bp->b_dcookie = uiop->uio_offset; 953 } 954 break; 955 default: 956 printf("nfs_doio: type %x unexpected\n", vp->v_type); 957 break; 958 } 959 if (error) { 960 bp->b_flags |= B_ERROR; 961 bp->b_error = error; 962 } 963 return error; 964 } 965 966 /* 967 * nfs_doio for write. 968 */ 969 static int 970 nfs_doio_write(bp, uiop) 971 struct buf *bp; 972 struct uio *uiop; 973 { 974 struct vnode *vp = bp->b_vp; 975 struct nfsnode *np = VTONFS(vp); 976 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 977 int iomode; 978 boolean_t stalewriteverf = FALSE; 979 int i, npages = (bp->b_bcount + PAGE_SIZE - 1) >> PAGE_SHIFT; 980 struct vm_page *pgs[npages]; 981 #ifndef NFS_V2_ONLY 982 boolean_t needcommit = TRUE; /* need only COMMIT RPC */ 983 #else 984 boolean_t needcommit = FALSE; /* need only COMMIT RPC */ 985 #endif 986 boolean_t pageprotected; 987 struct uvm_object *uobj = &vp->v_uobj; 988 int error; 989 off_t off, cnt; 990 991 if ((bp->b_flags & B_ASYNC) != 0 && NFS_ISV3(vp)) { 992 iomode = NFSV3WRITE_UNSTABLE; 993 } else { 994 iomode = NFSV3WRITE_FILESYNC; 995 } 996 997 #ifndef NFS_V2_ONLY 998 again: 999 #endif 1000 lockmgr(&nmp->nm_writeverflock, LK_SHARED, NULL); 1001 1002 for (i = 0; i < npages; i++) { 1003 pgs[i] = uvm_pageratop((vaddr_t)bp->b_data + (i << PAGE_SHIFT)); 1004 if (pgs[i]->uobject == uobj && 1005 pgs[i]->offset == uiop->uio_offset + (i << PAGE_SHIFT)) { 1006 KASSERT(pgs[i]->flags & PG_BUSY); 1007 /* 1008 * this page belongs to our object. 1009 */ 1010 simple_lock(&uobj->vmobjlock); 1011 /* 1012 * write out the page stably if it's about to 1013 * be released because we can't resend it 1014 * on the server crash. 1015 * 1016 * XXX assuming PG_RELEASE|PG_PAGEOUT won't be 1017 * changed until unbusy the page. 1018 */ 1019 if (pgs[i]->flags & (PG_RELEASED|PG_PAGEOUT)) 1020 iomode = NFSV3WRITE_FILESYNC; 1021 /* 1022 * if we met a page which hasn't been sent yet, 1023 * we need do WRITE RPC. 1024 */ 1025 if ((pgs[i]->flags & PG_NEEDCOMMIT) == 0) 1026 needcommit = FALSE; 1027 simple_unlock(&uobj->vmobjlock); 1028 } else { 1029 iomode = NFSV3WRITE_FILESYNC; 1030 needcommit = FALSE; 1031 } 1032 } 1033 if (!needcommit && iomode == NFSV3WRITE_UNSTABLE) { 1034 simple_lock(&uobj->vmobjlock); 1035 for (i = 0; i < npages; i++) { 1036 pgs[i]->flags |= PG_NEEDCOMMIT | PG_RDONLY; 1037 pmap_page_protect(pgs[i], VM_PROT_READ); 1038 } 1039 simple_unlock(&uobj->vmobjlock); 1040 pageprotected = TRUE; /* pages can't be modified during i/o. */ 1041 } else 1042 pageprotected = FALSE; 1043 1044 /* 1045 * Send the data to the server if necessary, 1046 * otherwise just send a commit rpc. 1047 */ 1048 #ifndef NFS_V2_ONLY 1049 if (needcommit) { 1050 1051 /* 1052 * If the buffer is in the range that we already committed, 1053 * there's nothing to do. 1054 * 1055 * If it's in the range that we need to commit, push the 1056 * whole range at once, otherwise only push the buffer. 1057 * In both these cases, acquire the commit lock to avoid 1058 * other processes modifying the range. 1059 */ 1060 1061 off = uiop->uio_offset; 1062 cnt = bp->b_bcount; 1063 lockmgr(&np->n_commitlock, LK_EXCLUSIVE, NULL); 1064 if (!nfs_in_committed_range(vp, off, bp->b_bcount)) { 1065 boolean_t pushedrange; 1066 if (nfs_in_tobecommitted_range(vp, off, bp->b_bcount)) { 1067 pushedrange = TRUE; 1068 off = np->n_pushlo; 1069 cnt = np->n_pushhi - np->n_pushlo; 1070 } else { 1071 pushedrange = FALSE; 1072 } 1073 error = nfs_commit(vp, off, cnt, curproc); 1074 if (error == 0) { 1075 if (pushedrange) { 1076 nfs_merge_commit_ranges(vp); 1077 } else { 1078 nfs_add_committed_range(vp, off, cnt); 1079 } 1080 } 1081 } else { 1082 error = 0; 1083 } 1084 lockmgr(&np->n_commitlock, LK_RELEASE, NULL); 1085 lockmgr(&nmp->nm_writeverflock, LK_RELEASE, NULL); 1086 if (!error) { 1087 /* 1088 * pages are now on stable storage. 1089 */ 1090 uiop->uio_resid = 0; 1091 simple_lock(&uobj->vmobjlock); 1092 for (i = 0; i < npages; i++) { 1093 pgs[i]->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY); 1094 } 1095 simple_unlock(&uobj->vmobjlock); 1096 return 0; 1097 } else if (error == NFSERR_STALEWRITEVERF) { 1098 nfs_clearcommit(vp->v_mount); 1099 goto again; 1100 } 1101 if (error) { 1102 bp->b_flags |= B_ERROR; 1103 bp->b_error = np->n_error = error; 1104 np->n_flag |= NWRITEERR; 1105 } 1106 return error; 1107 } 1108 #endif 1109 off = uiop->uio_offset; 1110 cnt = bp->b_bcount; 1111 uiop->uio_rw = UIO_WRITE; 1112 nfsstats.write_bios++; 1113 error = nfs_writerpc(vp, uiop, &iomode, pageprotected, &stalewriteverf); 1114 #ifndef NFS_V2_ONLY 1115 if (!error && iomode == NFSV3WRITE_UNSTABLE) { 1116 /* 1117 * we need to commit pages later. 1118 */ 1119 lockmgr(&np->n_commitlock, LK_EXCLUSIVE, NULL); 1120 nfs_add_tobecommitted_range(vp, off, cnt); 1121 /* 1122 * if there can be too many uncommitted pages, commit them now. 1123 */ 1124 if (np->n_pushhi - np->n_pushlo > nfs_commitsize) { 1125 off = np->n_pushlo; 1126 cnt = nfs_commitsize >> 1; 1127 error = nfs_commit(vp, off, cnt, curproc); 1128 if (!error) { 1129 nfs_add_committed_range(vp, off, cnt); 1130 nfs_del_tobecommitted_range(vp, off, cnt); 1131 } 1132 if (error == NFSERR_STALEWRITEVERF) { 1133 stalewriteverf = TRUE; 1134 error = 0; /* it isn't a real error */ 1135 } 1136 } else { 1137 /* 1138 * re-dirty pages so that they will be passed 1139 * to us later again. 1140 */ 1141 simple_lock(&uobj->vmobjlock); 1142 for (i = 0; i < npages; i++) { 1143 pgs[i]->flags &= ~PG_CLEAN; 1144 } 1145 simple_unlock(&uobj->vmobjlock); 1146 } 1147 lockmgr(&np->n_commitlock, LK_RELEASE, NULL); 1148 } else 1149 #endif 1150 if (!error) { 1151 /* 1152 * pages are now on stable storage. 1153 */ 1154 lockmgr(&np->n_commitlock, LK_EXCLUSIVE, NULL); 1155 nfs_del_committed_range(vp, off, cnt); 1156 lockmgr(&np->n_commitlock, LK_RELEASE, NULL); 1157 simple_lock(&uobj->vmobjlock); 1158 for (i = 0; i < npages; i++) { 1159 pgs[i]->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY); 1160 } 1161 simple_unlock(&uobj->vmobjlock); 1162 } else { 1163 /* 1164 * we got an error. 1165 */ 1166 bp->b_flags |= B_ERROR; 1167 bp->b_error = np->n_error = error; 1168 np->n_flag |= NWRITEERR; 1169 } 1170 1171 lockmgr(&nmp->nm_writeverflock, LK_RELEASE, NULL); 1172 1173 if (stalewriteverf) { 1174 nfs_clearcommit(vp->v_mount); 1175 } 1176 return error; 1177 } 1178 1179 /* 1180 * nfs_doio for B_PHYS. 1181 */ 1182 static int 1183 nfs_doio_phys(bp, uiop) 1184 struct buf *bp; 1185 struct uio *uiop; 1186 { 1187 struct vnode *vp = bp->b_vp; 1188 int error; 1189 1190 uiop->uio_offset = ((off_t)bp->b_blkno) << DEV_BSHIFT; 1191 if (bp->b_flags & B_READ) { 1192 uiop->uio_rw = UIO_READ; 1193 nfsstats.read_physios++; 1194 error = nfs_readrpc(vp, uiop); 1195 } else { 1196 int iomode = NFSV3WRITE_DATASYNC; 1197 boolean_t stalewriteverf; 1198 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1199 1200 uiop->uio_rw = UIO_WRITE; 1201 nfsstats.write_physios++; 1202 lockmgr(&nmp->nm_writeverflock, LK_SHARED, NULL); 1203 error = nfs_writerpc(vp, uiop, &iomode, FALSE, &stalewriteverf); 1204 lockmgr(&nmp->nm_writeverflock, LK_RELEASE, NULL); 1205 if (stalewriteverf) { 1206 nfs_clearcommit(bp->b_vp->v_mount); 1207 } 1208 } 1209 if (error) { 1210 bp->b_flags |= B_ERROR; 1211 bp->b_error = error; 1212 } 1213 return error; 1214 } 1215 1216 /* 1217 * Do an I/O operation to/from a cache block. This may be called 1218 * synchronously or from an nfsiod. 1219 */ 1220 int 1221 nfs_doio(bp, p) 1222 struct buf *bp; 1223 struct proc *p; 1224 { 1225 int error; 1226 struct uio uio; 1227 struct uio *uiop = &uio; 1228 struct iovec io; 1229 UVMHIST_FUNC("nfs_doio"); UVMHIST_CALLED(ubchist); 1230 1231 uiop->uio_iov = &io; 1232 uiop->uio_iovcnt = 1; 1233 uiop->uio_segflg = UIO_SYSSPACE; 1234 uiop->uio_procp = NULL; 1235 uiop->uio_offset = (((off_t)bp->b_blkno) << DEV_BSHIFT); 1236 io.iov_base = bp->b_data; 1237 io.iov_len = uiop->uio_resid = bp->b_bcount; 1238 1239 /* 1240 * Historically, paging was done with physio, but no more... 1241 */ 1242 if (bp->b_flags & B_PHYS) { 1243 /* 1244 * ...though reading /dev/drum still gets us here. 1245 */ 1246 error = nfs_doio_phys(bp, uiop); 1247 } else if (bp->b_flags & B_READ) { 1248 error = nfs_doio_read(bp, uiop); 1249 } else { 1250 error = nfs_doio_write(bp, uiop); 1251 } 1252 bp->b_resid = uiop->uio_resid; 1253 biodone(bp); 1254 return (error); 1255 } 1256 1257 /* 1258 * Vnode op for VM getpages. 1259 */ 1260 1261 int 1262 nfs_getpages(v) 1263 void *v; 1264 { 1265 struct vop_getpages_args /* { 1266 struct vnode *a_vp; 1267 voff_t a_offset; 1268 struct vm_page **a_m; 1269 int *a_count; 1270 int a_centeridx; 1271 vm_prot_t a_access_type; 1272 int a_advice; 1273 int a_flags; 1274 } */ *ap = v; 1275 1276 struct vnode *vp = ap->a_vp; 1277 struct uvm_object *uobj = &vp->v_uobj; 1278 struct nfsnode *np = VTONFS(vp); 1279 const int npages = *ap->a_count; 1280 struct vm_page *pg, **pgs, *opgs[npages]; 1281 off_t origoffset, len; 1282 int i, error; 1283 boolean_t v3 = NFS_ISV3(vp); 1284 boolean_t write = (ap->a_access_type & VM_PROT_WRITE) != 0; 1285 boolean_t locked = (ap->a_flags & PGO_LOCKED) != 0; 1286 1287 /* 1288 * call the genfs code to get the pages. `pgs' may be NULL 1289 * when doing read-ahead. 1290 */ 1291 1292 pgs = ap->a_m; 1293 if (write && locked && v3) { 1294 KASSERT(pgs != NULL); 1295 #ifdef DEBUG 1296 1297 /* 1298 * If PGO_LOCKED is set, real pages shouldn't exists 1299 * in the array. 1300 */ 1301 1302 for (i = 0; i < npages; i++) 1303 KDASSERT(pgs[i] == NULL || pgs[i] == PGO_DONTCARE); 1304 #endif 1305 memcpy(opgs, pgs, npages * sizeof(struct vm_pages *)); 1306 } 1307 error = genfs_getpages(v); 1308 if (error) { 1309 return (error); 1310 } 1311 1312 /* 1313 * for read faults where the nfs node is not yet marked NMODIFIED, 1314 * set PG_RDONLY on the pages so that we come back here if someone 1315 * tries to modify later via the mapping that will be entered for 1316 * this fault. 1317 */ 1318 1319 if (!write && (np->n_flag & NMODIFIED) == 0 && pgs != NULL) { 1320 if (!locked) { 1321 simple_lock(&uobj->vmobjlock); 1322 } 1323 for (i = 0; i < npages; i++) { 1324 pg = pgs[i]; 1325 if (pg == NULL || pg == PGO_DONTCARE) { 1326 continue; 1327 } 1328 pg->flags |= PG_RDONLY; 1329 } 1330 if (!locked) { 1331 simple_unlock(&uobj->vmobjlock); 1332 } 1333 } 1334 if (!write) { 1335 return (0); 1336 } 1337 1338 /* 1339 * this is a write fault, update the commit info. 1340 */ 1341 1342 origoffset = ap->a_offset; 1343 len = npages << PAGE_SHIFT; 1344 1345 if (v3) { 1346 error = lockmgr(&np->n_commitlock, 1347 LK_EXCLUSIVE | (locked ? LK_NOWAIT : 0), NULL); 1348 if (error) { 1349 KASSERT(locked != 0); 1350 1351 /* 1352 * Since PGO_LOCKED is set, we need to unbusy 1353 * all pages fetched by genfs_getpages() above, 1354 * tell the caller that there are no pages 1355 * available and put back original pgs array. 1356 */ 1357 1358 uvm_lock_pageq(); 1359 uvm_page_unbusy(pgs, npages); 1360 uvm_unlock_pageq(); 1361 *ap->a_count = 0; 1362 memcpy(pgs, opgs, 1363 npages * sizeof(struct vm_pages *)); 1364 return (error); 1365 } 1366 nfs_del_committed_range(vp, origoffset, len); 1367 nfs_del_tobecommitted_range(vp, origoffset, len); 1368 } 1369 np->n_flag |= NMODIFIED; 1370 if (!locked) { 1371 simple_lock(&uobj->vmobjlock); 1372 } 1373 for (i = 0; i < npages; i++) { 1374 pg = pgs[i]; 1375 if (pg == NULL || pg == PGO_DONTCARE) { 1376 continue; 1377 } 1378 pg->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY); 1379 } 1380 if (!locked) { 1381 simple_unlock(&uobj->vmobjlock); 1382 } 1383 if (v3) { 1384 lockmgr(&np->n_commitlock, LK_RELEASE, NULL); 1385 } 1386 return (0); 1387 } 1388