Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_bio.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* $NetBSD: nfs_bio.c,v 1.128.2.2 2005/11/21 20:51:21 tron 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 1.128.2.2 2005/11/21 20:51:21 tron 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 proc *p; 89 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 90 struct nfsdircache *ndp = NULL, *nndp = NULL; 91 caddr_t baddr, ep, edp; 92 int got_buf = 0, error = 0, n = 0, on = 0, en, enn; 93 int enough = 0; 94 struct dirent *dp, *pdp; 95 off_t curoff = 0; 96 97 #ifdef DIAGNOSTIC 98 if (uio->uio_rw != UIO_READ) 99 panic("nfs_read mode"); 100 #endif 101 if (uio->uio_resid == 0) 102 return (0); 103 if (vp->v_type != VDIR && uio->uio_offset < 0) 104 return (EINVAL); 105 p = uio->uio_procp; 106 #ifndef NFS_V2_ONLY 107 if ((nmp->nm_flag & NFSMNT_NFSV3) && 108 !(nmp->nm_iflag & NFSMNT_GOTFSINFO)) 109 (void)nfs_fsinfo(nmp, vp, cred, p); 110 #endif 111 if (vp->v_type != VDIR && 112 (uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize) 113 return (EFBIG); 114 115 /* 116 * For nfs, cache consistency can only be maintained approximately. 117 * Although RFC1094 does not specify the criteria, the following is 118 * believed to be compatible with the reference port. 119 * For nqnfs, full cache consistency is maintained within the loop. 120 * For nfs: 121 * If the file's modify time on the server has changed since the 122 * last read rpc or you have written to the file, 123 * you may have lost data cache consistency with the 124 * server, so flush all of the file's data out of the cache. 125 * Then force a getattr rpc to ensure that you have up to date 126 * attributes. 127 * NB: This implies that cache data can be read when up to 128 * NFS_ATTRTIMEO seconds out of date. If you find that you need current 129 * attributes this could be forced by setting n_attrstamp to 0 before 130 * the VOP_GETATTR() call. 131 */ 132 133 if ((nmp->nm_flag & NFSMNT_NQNFS) == 0 && vp->v_type != VLNK) { 134 error = nfs_flushstalebuf(vp, cred, p, 135 NFS_FLUSHSTALEBUF_MYWRITE); 136 if (error) 137 return error; 138 } 139 140 do { 141 #ifndef NFS_V2_ONLY 142 /* 143 * Get a valid lease. If cached data is stale, flush it. 144 */ 145 if (nmp->nm_flag & NFSMNT_NQNFS) { 146 if (NQNFS_CKINVALID(vp, np, ND_READ)) { 147 do { 148 error = nqnfs_getlease(vp, ND_READ, cred, p); 149 } while (error == NQNFS_EXPIRED); 150 if (error) 151 return (error); 152 if (np->n_lrev != np->n_brev || 153 (np->n_flag & NQNFSNONCACHE) || 154 ((np->n_flag & NMODIFIED) && vp->v_type == VDIR)) { 155 if (vp->v_type == VDIR) { 156 nfs_invaldircache(vp, 0); 157 } 158 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 159 if (error) 160 return (error); 161 np->n_brev = np->n_lrev; 162 } 163 } else if (vp->v_type == VDIR && (np->n_flag & NMODIFIED)) { 164 nfs_invaldircache(vp, 0); 165 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 166 if (error) 167 return (error); 168 } 169 } 170 #endif 171 /* 172 * Don't cache symlinks. 173 */ 174 if (np->n_flag & NQNFSNONCACHE 175 || ((vp->v_flag & VROOT) && vp->v_type == VLNK)) { 176 switch (vp->v_type) { 177 case VREG: 178 return (nfs_readrpc(vp, uio)); 179 case VLNK: 180 return (nfs_readlinkrpc(vp, uio, cred)); 181 case VDIR: 182 break; 183 default: 184 printf(" NQNFSNONCACHE: type %x unexpected\n", 185 vp->v_type); 186 }; 187 } 188 baddr = (caddr_t)0; 189 switch (vp->v_type) { 190 case VREG: 191 nfsstats.biocache_reads++; 192 193 error = 0; 194 while (uio->uio_resid > 0) { 195 void *win; 196 int flags; 197 vsize_t bytelen; 198 199 nfs_delayedtruncate(vp); 200 if (np->n_size <= uio->uio_offset) { 201 break; 202 } 203 bytelen = 204 MIN(np->n_size - uio->uio_offset, uio->uio_resid); 205 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, 206 &bytelen, UBC_READ); 207 error = uiomove(win, bytelen, uio); 208 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 209 ubc_release(win, flags); 210 if (error) { 211 /* 212 * XXXkludge 213 * the file has been truncated on the server. 214 * there isn't much we can do. 215 */ 216 if (uio->uio_offset >= np->n_size) { 217 /* end of file */ 218 error = 0; 219 } else { 220 break; 221 } 222 } 223 } 224 break; 225 226 case VLNK: 227 nfsstats.biocache_readlinks++; 228 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, p); 229 if (!bp) 230 return (EINTR); 231 if ((bp->b_flags & B_DONE) == 0) { 232 bp->b_flags |= B_READ; 233 error = nfs_doio(bp, p); 234 if (error) { 235 brelse(bp); 236 return (error); 237 } 238 } 239 n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid); 240 got_buf = 1; 241 on = 0; 242 break; 243 case VDIR: 244 diragain: 245 nfsstats.biocache_readdirs++; 246 ndp = nfs_searchdircache(vp, uio->uio_offset, 247 (nmp->nm_flag & NFSMNT_XLATECOOKIE), 0); 248 if (!ndp) { 249 /* 250 * We've been handed a cookie that is not 251 * in the cache. If we're not translating 252 * 32 <-> 64, it may be a value that was 253 * flushed out of the cache because it grew 254 * too big. Let the server judge if it's 255 * valid or not. In the translation case, 256 * we have no way of validating this value, 257 * so punt. 258 */ 259 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) 260 return (EINVAL); 261 ndp = nfs_enterdircache(vp, uio->uio_offset, 262 uio->uio_offset, 0, 0); 263 } 264 265 if (NFS_EOFVALID(np) && 266 ndp->dc_cookie == np->n_direofoffset) { 267 nfs_putdircache(np, ndp); 268 nfsstats.direofcache_hits++; 269 return (0); 270 } 271 272 bp = nfs_getcacheblk(vp, NFSDC_BLKNO(ndp), NFS_DIRBLKSIZ, p); 273 if (!bp) 274 return (EINTR); 275 if ((bp->b_flags & B_DONE) == 0) { 276 bp->b_flags |= B_READ; 277 bp->b_dcookie = ndp->dc_blkcookie; 278 error = nfs_doio(bp, p); 279 if (error) { 280 /* 281 * Yuck! The directory has been modified on the 282 * server. Punt and let the userland code 283 * deal with it. 284 */ 285 nfs_putdircache(np, ndp); 286 brelse(bp); 287 if (error == NFSERR_BAD_COOKIE) { 288 nfs_invaldircache(vp, 0); 289 nfs_vinvalbuf(vp, 0, cred, p, 1); 290 error = EINVAL; 291 } 292 return (error); 293 } 294 } 295 296 /* 297 * Just return if we hit EOF right away with this 298 * block. Always check here, because direofoffset 299 * may have been set by an nfsiod since the last 300 * check. 301 * 302 * also, empty block implies EOF. 303 */ 304 305 if (bp->b_bcount == bp->b_resid || 306 (NFS_EOFVALID(np) && 307 ndp->dc_blkcookie == np->n_direofoffset)) { 308 KASSERT(bp->b_bcount != bp->b_resid || 309 ndp->dc_blkcookie == bp->b_dcookie); 310 nfs_putdircache(np, ndp); 311 bp->b_flags |= B_NOCACHE; 312 brelse(bp); 313 return 0; 314 } 315 316 /* 317 * Find the entry we were looking for in the block. 318 */ 319 320 en = ndp->dc_entry; 321 322 pdp = dp = (struct dirent *)bp->b_data; 323 edp = bp->b_data + bp->b_bcount - bp->b_resid; 324 enn = 0; 325 while (enn < en && (caddr_t)dp < edp) { 326 pdp = dp; 327 dp = (struct dirent *)((caddr_t)dp + dp->d_reclen); 328 enn++; 329 } 330 331 /* 332 * If the entry number was bigger than the number of 333 * entries in the block, or the cookie of the previous 334 * entry doesn't match, the directory cache is 335 * stale. Flush it and try again (i.e. go to 336 * the server). 337 */ 338 if ((caddr_t)dp >= edp || (caddr_t)dp + dp->d_reclen > edp || 339 (en > 0 && NFS_GETCOOKIE(pdp) != ndp->dc_cookie)) { 340 #ifdef DEBUG 341 printf("invalid cache: %p %p %p off %lx %lx\n", 342 pdp, dp, edp, 343 (unsigned long)uio->uio_offset, 344 (unsigned long)NFS_GETCOOKIE(pdp)); 345 #endif 346 nfs_putdircache(np, ndp); 347 brelse(bp); 348 nfs_invaldircache(vp, 0); 349 nfs_vinvalbuf(vp, 0, cred, p, 0); 350 goto diragain; 351 } 352 353 on = (caddr_t)dp - bp->b_data; 354 355 /* 356 * Cache all entries that may be exported to the 357 * user, as they may be thrown back at us. The 358 * NFSBIO_CACHECOOKIES flag indicates that all 359 * entries are being 'exported', so cache them all. 360 */ 361 362 if (en == 0 && pdp == dp) { 363 dp = (struct dirent *) 364 ((caddr_t)dp + dp->d_reclen); 365 enn++; 366 } 367 368 if (uio->uio_resid < (bp->b_bcount - bp->b_resid - on)) { 369 n = uio->uio_resid; 370 enough = 1; 371 } else 372 n = bp->b_bcount - bp->b_resid - on; 373 374 ep = bp->b_data + on + n; 375 376 /* 377 * Find last complete entry to copy, caching entries 378 * (if requested) as we go. 379 */ 380 381 while ((caddr_t)dp < ep && (caddr_t)dp + dp->d_reclen <= ep) { 382 if (cflag & NFSBIO_CACHECOOKIES) { 383 nndp = nfs_enterdircache(vp, NFS_GETCOOKIE(pdp), 384 ndp->dc_blkcookie, enn, bp->b_lblkno); 385 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) { 386 NFS_STASHCOOKIE32(pdp, 387 nndp->dc_cookie32); 388 } 389 nfs_putdircache(np, nndp); 390 } 391 pdp = dp; 392 dp = (struct dirent *)((caddr_t)dp + dp->d_reclen); 393 enn++; 394 } 395 nfs_putdircache(np, ndp); 396 397 /* 398 * If the last requested entry was not the last in the 399 * buffer (happens if NFS_DIRFRAGSIZ < NFS_DIRBLKSIZ), 400 * cache the cookie of the last requested one, and 401 * set of the offset to it. 402 */ 403 404 if ((on + n) < bp->b_bcount - bp->b_resid) { 405 curoff = NFS_GETCOOKIE(pdp); 406 nndp = nfs_enterdircache(vp, curoff, ndp->dc_blkcookie, 407 enn, bp->b_lblkno); 408 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) { 409 NFS_STASHCOOKIE32(pdp, nndp->dc_cookie32); 410 curoff = nndp->dc_cookie32; 411 } 412 nfs_putdircache(np, nndp); 413 } else 414 curoff = bp->b_dcookie; 415 416 /* 417 * Always cache the entry for the next block, 418 * so that readaheads can use it. 419 */ 420 nndp = nfs_enterdircache(vp, bp->b_dcookie, bp->b_dcookie, 0,0); 421 if (nmp->nm_flag & NFSMNT_XLATECOOKIE) { 422 if (curoff == bp->b_dcookie) { 423 NFS_STASHCOOKIE32(pdp, nndp->dc_cookie32); 424 curoff = nndp->dc_cookie32; 425 } 426 } 427 428 n = ((caddr_t)pdp + pdp->d_reclen) - (bp->b_data + on); 429 430 /* 431 * If not eof and read aheads are enabled, start one. 432 * (You need the current block first, so that you have the 433 * directory offset cookie of the next block.) 434 */ 435 if (nfs_numasync > 0 && nmp->nm_readahead > 0 && 436 !NFS_EOFVALID(np) && !(np->n_flag & NQNFSNONCACHE)) { 437 rabp = nfs_getcacheblk(vp, NFSDC_BLKNO(nndp), 438 NFS_DIRBLKSIZ, p); 439 if (rabp) { 440 if ((rabp->b_flags & (B_DONE | B_DELWRI)) == 0) { 441 rabp->b_dcookie = nndp->dc_cookie; 442 rabp->b_flags |= (B_READ | B_ASYNC); 443 if (nfs_asyncio(rabp)) { 444 rabp->b_flags |= B_INVAL; 445 brelse(rabp); 446 } 447 } else 448 brelse(rabp); 449 } 450 } 451 nfs_putdircache(np, nndp); 452 got_buf = 1; 453 break; 454 default: 455 printf(" nfsbioread: type %x unexpected\n",vp->v_type); 456 break; 457 } 458 459 if (n > 0) { 460 if (!baddr) 461 baddr = bp->b_data; 462 error = uiomove(baddr + on, (int)n, uio); 463 } 464 switch (vp->v_type) { 465 case VREG: 466 break; 467 case VLNK: 468 n = 0; 469 break; 470 case VDIR: 471 if (np->n_flag & NQNFSNONCACHE) 472 bp->b_flags |= B_INVAL; 473 uio->uio_offset = curoff; 474 if (enough) 475 n = 0; 476 break; 477 default: 478 printf(" nfsbioread: type %x unexpected\n",vp->v_type); 479 } 480 if (got_buf) 481 brelse(bp); 482 } while (error == 0 && uio->uio_resid > 0 && n > 0); 483 return (error); 484 } 485 486 /* 487 * Vnode op for write using bio 488 */ 489 int 490 nfs_write(v) 491 void *v; 492 { 493 struct vop_write_args /* { 494 struct vnode *a_vp; 495 struct uio *a_uio; 496 int a_ioflag; 497 struct ucred *a_cred; 498 } */ *ap = v; 499 struct uio *uio = ap->a_uio; 500 struct proc *p = uio->uio_procp; 501 struct vnode *vp = ap->a_vp; 502 struct nfsnode *np = VTONFS(vp); 503 struct ucred *cred = ap->a_cred; 504 struct vattr vattr; 505 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 506 void *win; 507 voff_t oldoff, origoff; 508 vsize_t bytelen; 509 int flags, error = 0; 510 int ioflag = ap->a_ioflag; 511 int extended = 0, wrotedata = 0; 512 513 #ifdef DIAGNOSTIC 514 if (uio->uio_rw != UIO_WRITE) 515 panic("nfs_write mode"); 516 if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) 517 panic("nfs_write proc"); 518 #endif 519 if (vp->v_type != VREG) 520 return (EIO); 521 if (np->n_flag & NWRITEERR) { 522 np->n_flag &= ~NWRITEERR; 523 return (np->n_error); 524 } 525 #ifndef NFS_V2_ONLY 526 if ((nmp->nm_flag & NFSMNT_NFSV3) && 527 !(nmp->nm_iflag & NFSMNT_GOTFSINFO)) 528 (void)nfs_fsinfo(nmp, vp, cred, p); 529 #endif 530 if (ioflag & (IO_APPEND | IO_SYNC)) { 531 if (np->n_flag & NMODIFIED) { 532 NFS_INVALIDATE_ATTRCACHE(np); 533 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 534 if (error) 535 return (error); 536 } 537 if (ioflag & IO_APPEND) { 538 NFS_INVALIDATE_ATTRCACHE(np); 539 error = VOP_GETATTR(vp, &vattr, cred, p); 540 if (error) 541 return (error); 542 uio->uio_offset = np->n_size; 543 } 544 } 545 if (uio->uio_offset < 0) 546 return (EINVAL); 547 if ((uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize) 548 return (EFBIG); 549 if (uio->uio_resid == 0) 550 return (0); 551 /* 552 * Maybe this should be above the vnode op call, but so long as 553 * file servers have no limits, i don't think it matters 554 */ 555 if (p && uio->uio_offset + uio->uio_resid > 556 p->p_rlimit[RLIMIT_FSIZE].rlim_cur) { 557 psignal(p, SIGXFSZ); 558 return (EFBIG); 559 } 560 561 if ((np->n_flag & NQNFSNONCACHE) && uio->uio_iovcnt == 1) { 562 int iomode = NFSV3WRITE_FILESYNC; 563 boolean_t stalewriteverf = FALSE; 564 565 lockmgr(&nmp->nm_writeverflock, LK_SHARED, NULL); 566 error = nfs_writerpc(vp, uio, &iomode, FALSE, &stalewriteverf); 567 lockmgr(&nmp->nm_writeverflock, LK_RELEASE, NULL); 568 if (stalewriteverf) 569 nfs_clearcommit(vp->v_mount); 570 return (error); 571 } 572 573 origoff = uio->uio_offset; 574 do { 575 boolean_t extending; /* if we are extending whole pages */ 576 u_quad_t oldsize; 577 oldoff = uio->uio_offset; 578 bytelen = uio->uio_resid; 579 580 #ifndef NFS_V2_ONLY 581 /* 582 * Check for a valid write lease. 583 */ 584 if ((nmp->nm_flag & NFSMNT_NQNFS) && 585 NQNFS_CKINVALID(vp, np, ND_WRITE)) { 586 do { 587 error = nqnfs_getlease(vp, ND_WRITE, cred, p); 588 } while (error == NQNFS_EXPIRED); 589 if (error) 590 return (error); 591 if (np->n_lrev != np->n_brev || 592 (np->n_flag & NQNFSNONCACHE)) { 593 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 594 if (error) 595 return (error); 596 np->n_brev = np->n_lrev; 597 } 598 } 599 #endif 600 nfsstats.biocache_writes++; 601 602 oldsize = np->n_size; 603 np->n_flag |= NMODIFIED; 604 if (np->n_size < uio->uio_offset + bytelen) { 605 np->n_size = uio->uio_offset + bytelen; 606 } 607 extending = ((uio->uio_offset & PAGE_MASK) == 0 && 608 (bytelen & PAGE_MASK) == 0 && 609 uio->uio_offset >= vp->v_size); 610 win = ubc_alloc(&vp->v_uobj, uio->uio_offset, &bytelen, 611 UBC_WRITE | (extending ? UBC_FAULTBUSY : 0)); 612 error = uiomove(win, bytelen, uio); 613 flags = UBC_WANT_UNMAP(vp) ? UBC_UNMAP : 0; 614 ubc_release(win, flags); 615 if (error) { 616 if (extending) { 617 /* 618 * backout size and free pages past eof. 619 */ 620 np->n_size = oldsize; 621 simple_lock(&vp->v_interlock); 622 (void)VOP_PUTPAGES(vp, round_page(vp->v_size), 623 0, PGO_SYNCIO | PGO_FREE); 624 } 625 break; 626 } 627 wrotedata = 1; 628 629 /* 630 * update UVM's notion of the size now that we've 631 * copied the data into the vnode's pages. 632 */ 633 634 if (vp->v_size < uio->uio_offset) { 635 uvm_vnp_setsize(vp, uio->uio_offset); 636 extended = 1; 637 } 638 639 if ((oldoff & ~(nmp->nm_wsize - 1)) != 640 (uio->uio_offset & ~(nmp->nm_wsize - 1))) { 641 simple_lock(&vp->v_interlock); 642 error = VOP_PUTPAGES(vp, 643 trunc_page(oldoff & ~(nmp->nm_wsize - 1)), 644 round_page((uio->uio_offset + nmp->nm_wsize - 1) & 645 ~(nmp->nm_wsize - 1)), PGO_CLEANIT); 646 } 647 } while (uio->uio_resid > 0); 648 if (wrotedata) 649 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); 650 if ((np->n_flag & NQNFSNONCACHE) || (ioflag & IO_SYNC)) { 651 simple_lock(&vp->v_interlock); 652 error = VOP_PUTPAGES(vp, 653 trunc_page(origoff & ~(nmp->nm_wsize - 1)), 654 round_page((uio->uio_offset + nmp->nm_wsize - 1) & 655 ~(nmp->nm_wsize - 1)), 656 PGO_CLEANIT | PGO_SYNCIO); 657 } 658 return error; 659 } 660 661 /* 662 * Get an nfs cache block. 663 * Allocate a new one if the block isn't currently in the cache 664 * and return the block marked busy. If the calling process is 665 * interrupted by a signal for an interruptible mount point, return 666 * NULL. 667 */ 668 struct buf * 669 nfs_getcacheblk(vp, bn, size, p) 670 struct vnode *vp; 671 daddr_t bn; 672 int size; 673 struct proc *p; 674 { 675 struct buf *bp; 676 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 677 678 if (nmp->nm_flag & NFSMNT_INT) { 679 bp = getblk(vp, bn, size, PCATCH, 0); 680 while (bp == NULL) { 681 if (nfs_sigintr(nmp, NULL, p)) 682 return (NULL); 683 bp = getblk(vp, bn, size, 0, 2 * hz); 684 } 685 } else 686 bp = getblk(vp, bn, size, 0, 0); 687 return (bp); 688 } 689 690 /* 691 * Flush and invalidate all dirty buffers. If another process is already 692 * doing the flush, just wait for completion. 693 */ 694 int 695 nfs_vinvalbuf(vp, flags, cred, p, intrflg) 696 struct vnode *vp; 697 int flags; 698 struct ucred *cred; 699 struct proc *p; 700 int intrflg; 701 { 702 struct nfsnode *np = VTONFS(vp); 703 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 704 int error = 0, slpflag, slptimeo; 705 706 if ((nmp->nm_flag & NFSMNT_INT) == 0) 707 intrflg = 0; 708 if (intrflg) { 709 slpflag = PCATCH; 710 slptimeo = 2 * hz; 711 } else { 712 slpflag = 0; 713 slptimeo = 0; 714 } 715 /* 716 * First wait for any other process doing a flush to complete. 717 */ 718 simple_lock(&vp->v_interlock); 719 while (np->n_flag & NFLUSHINPROG) { 720 np->n_flag |= NFLUSHWANT; 721 error = ltsleep(&np->n_flag, PRIBIO + 2, "nfsvinval", 722 slptimeo, &vp->v_interlock); 723 if (error && intrflg && nfs_sigintr(nmp, NULL, p)) { 724 simple_unlock(&vp->v_interlock); 725 return EINTR; 726 } 727 } 728 729 /* 730 * Now, flush as required. 731 */ 732 np->n_flag |= NFLUSHINPROG; 733 simple_unlock(&vp->v_interlock); 734 error = vinvalbuf(vp, flags, cred, p, slpflag, 0); 735 while (error) { 736 if (intrflg && nfs_sigintr(nmp, NULL, p)) { 737 error = EINTR; 738 break; 739 } 740 error = vinvalbuf(vp, flags, cred, p, 0, slptimeo); 741 } 742 simple_lock(&vp->v_interlock); 743 if (error == 0) 744 np->n_flag &= ~NMODIFIED; 745 np->n_flag &= ~NFLUSHINPROG; 746 if (np->n_flag & NFLUSHWANT) { 747 np->n_flag &= ~NFLUSHWANT; 748 wakeup(&np->n_flag); 749 } 750 simple_unlock(&vp->v_interlock); 751 return error; 752 } 753 754 /* 755 * nfs_flushstalebuf: flush cache if it's stale. 756 * 757 * => caller shouldn't own any pages or buffers which belong to the vnode. 758 */ 759 760 int 761 nfs_flushstalebuf(struct vnode *vp, struct ucred *cred, struct proc *p, 762 int flags) 763 { 764 struct nfsnode *np = VTONFS(vp); 765 struct vattr vattr; 766 int error; 767 768 if (np->n_flag & NMODIFIED) { 769 if ((flags & NFS_FLUSHSTALEBUF_MYWRITE) == 0 770 || vp->v_type != VREG) { 771 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 772 if (error) 773 return error; 774 if (vp->v_type == VDIR) { 775 nfs_invaldircache(vp, 0); 776 } 777 } else { 778 /* 779 * XXX assuming writes are ours. 780 */ 781 } 782 NFS_INVALIDATE_ATTRCACHE(np); 783 error = VOP_GETATTR(vp, &vattr, cred, p); 784 if (error) 785 return error; 786 np->n_mtime = vattr.va_mtime; 787 } else { 788 error = VOP_GETATTR(vp, &vattr, cred, p); 789 if (error) 790 return error; 791 if (timespeccmp(&np->n_mtime, &vattr.va_mtime, !=)) { 792 if (vp->v_type == VDIR) { 793 nfs_invaldircache(vp, 0); 794 } 795 error = nfs_vinvalbuf(vp, V_SAVE, cred, p, 1); 796 if (error) 797 return error; 798 np->n_mtime = vattr.va_mtime; 799 } 800 } 801 802 return error; 803 } 804 805 /* 806 * Initiate asynchronous I/O. Return an error if no nfsiods are available. 807 * This is mainly to avoid queueing async I/O requests when the nfsiods 808 * are all hung on a dead server. 809 */ 810 811 int 812 nfs_asyncio(bp) 813 struct buf *bp; 814 { 815 int i; 816 struct nfsmount *nmp; 817 int gotiod, slpflag = 0, slptimeo = 0, error; 818 819 if (nfs_numasync == 0) 820 return (EIO); 821 822 nmp = VFSTONFS(bp->b_vp->v_mount); 823 again: 824 if (nmp->nm_flag & NFSMNT_INT) 825 slpflag = PCATCH; 826 gotiod = FALSE; 827 828 /* 829 * Find a free iod to process this request. 830 */ 831 832 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) { 833 struct nfs_iod *iod = &nfs_asyncdaemon[i]; 834 835 simple_lock(&iod->nid_slock); 836 if (iod->nid_want) { 837 /* 838 * Found one, so wake it up and tell it which 839 * mount to process. 840 */ 841 iod->nid_want = NULL; 842 iod->nid_mount = nmp; 843 wakeup(&iod->nid_want); 844 simple_lock(&nmp->nm_slock); 845 simple_unlock(&iod->nid_slock); 846 nmp->nm_bufqiods++; 847 gotiod = TRUE; 848 break; 849 } 850 simple_unlock(&iod->nid_slock); 851 } 852 853 /* 854 * If none are free, we may already have an iod working on this mount 855 * point. If so, it will process our request. 856 */ 857 858 if (!gotiod) { 859 simple_lock(&nmp->nm_slock); 860 if (nmp->nm_bufqiods > 0) 861 gotiod = TRUE; 862 } 863 864 LOCK_ASSERT(simple_lock_held(&nmp->nm_slock)); 865 866 /* 867 * If we have an iod which can process the request, then queue 868 * the buffer. However, even if we have an iod, do not initiate 869 * queue cleaning if curproc is the pageout daemon. if the NFS mount 870 * is via local loopback, we may put curproc (pagedaemon) to sleep 871 * waiting for the writes to complete. But the server (ourself) 872 * may block the write, waiting for its (ie., our) pagedaemon 873 * to produce clean pages to handle the write: deadlock. 874 * XXX: start non-loopback mounts straight away? If "lots free", 875 * let pagedaemon start loopback writes anyway? 876 */ 877 if (gotiod) { 878 879 /* 880 * Ensure that the queue never grows too large. 881 */ 882 if (curproc == uvm.pagedaemon_proc) { 883 /* Enque for later, to avoid free-page deadlock */ 884 (void) 0; 885 } else while (nmp->nm_bufqlen >= 2*nfs_numasync) { 886 nmp->nm_bufqwant = TRUE; 887 error = ltsleep(&nmp->nm_bufq, 888 slpflag | PRIBIO | PNORELOCK, 889 "nfsaio", slptimeo, &nmp->nm_slock); 890 if (error) { 891 if (nfs_sigintr(nmp, NULL, curproc)) 892 return (EINTR); 893 if (slpflag == PCATCH) { 894 slpflag = 0; 895 slptimeo = 2 * hz; 896 } 897 } 898 899 /* 900 * We might have lost our iod while sleeping, 901 * so check and loop if nescessary. 902 */ 903 904 if (nmp->nm_bufqiods == 0) 905 goto again; 906 907 simple_lock(&nmp->nm_slock); 908 } 909 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist); 910 nmp->nm_bufqlen++; 911 simple_unlock(&nmp->nm_slock); 912 return (0); 913 } 914 simple_unlock(&nmp->nm_slock); 915 916 /* 917 * All the iods are busy on other mounts, so return EIO to 918 * force the caller to process the i/o synchronously. 919 */ 920 921 return (EIO); 922 } 923 924 /* 925 * nfs_doio for read. 926 */ 927 static int 928 nfs_doio_read(bp, uiop) 929 struct buf *bp; 930 struct uio *uiop; 931 { 932 struct vnode *vp = bp->b_vp; 933 struct nfsnode *np = VTONFS(vp); 934 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 935 int error = 0; 936 937 uiop->uio_rw = UIO_READ; 938 switch (vp->v_type) { 939 case VREG: 940 nfsstats.read_bios++; 941 error = nfs_readrpc(vp, uiop); 942 if (!error && uiop->uio_resid) { 943 int diff, len; 944 945 /* 946 * If uio_resid > 0, there is a hole in the file and 947 * no writes after the hole have been pushed to 948 * the server yet or the file has been truncated 949 * on the server. 950 * Just zero fill the rest of the valid area. 951 */ 952 953 KASSERT(vp->v_size >= 954 uiop->uio_offset + uiop->uio_resid); 955 diff = bp->b_bcount - uiop->uio_resid; 956 len = uiop->uio_resid; 957 memset((char *)bp->b_data + diff, 0, len); 958 } 959 if (uiop->uio_procp && (vp->v_flag & VTEXT) && 960 (((nmp->nm_flag & NFSMNT_NQNFS) && 961 NQNFS_CKINVALID(vp, np, ND_READ) && 962 np->n_lrev != np->n_brev) || 963 (!(nmp->nm_flag & NFSMNT_NQNFS) && 964 timespeccmp(&np->n_mtime, &np->n_vattr->va_mtime, !=)))) { 965 uprintf("Process killed due to " 966 "text file modification\n"); 967 psignal(uiop->uio_procp, SIGKILL); 968 #if 0 /* XXX NJWLWP */ 969 uiop->uio_procp->p_holdcnt++; 970 #endif 971 } 972 break; 973 case VLNK: 974 KASSERT(uiop->uio_offset == (off_t)0); 975 nfsstats.readlink_bios++; 976 error = nfs_readlinkrpc(vp, uiop, curproc->p_ucred); 977 break; 978 case VDIR: 979 nfsstats.readdir_bios++; 980 uiop->uio_offset = bp->b_dcookie; 981 #ifndef NFS_V2_ONLY 982 if (nmp->nm_flag & NFSMNT_RDIRPLUS) { 983 error = nfs_readdirplusrpc(vp, uiop, np->n_rcred); 984 if (error == NFSERR_NOTSUPP) 985 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 986 } 987 #else 988 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 989 #endif 990 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0) 991 error = nfs_readdirrpc(vp, uiop, np->n_rcred); 992 if (!error) { 993 bp->b_dcookie = uiop->uio_offset; 994 } 995 break; 996 default: 997 printf("nfs_doio: type %x unexpected\n", vp->v_type); 998 break; 999 } 1000 if (error) { 1001 bp->b_flags |= B_ERROR; 1002 bp->b_error = error; 1003 } 1004 return error; 1005 } 1006 1007 /* 1008 * nfs_doio for write. 1009 */ 1010 static int 1011 nfs_doio_write(bp, uiop) 1012 struct buf *bp; 1013 struct uio *uiop; 1014 { 1015 struct vnode *vp = bp->b_vp; 1016 struct nfsnode *np = VTONFS(vp); 1017 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1018 int iomode; 1019 boolean_t stalewriteverf = FALSE; 1020 int i, npages = (bp->b_bcount + PAGE_SIZE - 1) >> PAGE_SHIFT; 1021 struct vm_page *pgs[npages]; 1022 #ifndef NFS_V2_ONLY 1023 boolean_t needcommit = TRUE; /* need only COMMIT RPC */ 1024 #else 1025 boolean_t needcommit = FALSE; /* need only COMMIT RPC */ 1026 #endif 1027 boolean_t pageprotected; 1028 struct uvm_object *uobj = &vp->v_uobj; 1029 int error; 1030 off_t off, cnt; 1031 1032 if ((bp->b_flags & B_ASYNC) != 0 && NFS_ISV3(vp)) { 1033 iomode = NFSV3WRITE_UNSTABLE; 1034 } else { 1035 iomode = NFSV3WRITE_FILESYNC; 1036 } 1037 1038 #ifndef NFS_V2_ONLY 1039 again: 1040 #endif 1041 lockmgr(&nmp->nm_writeverflock, LK_SHARED, NULL); 1042 1043 for (i = 0; i < npages; i++) { 1044 pgs[i] = uvm_pageratop((vaddr_t)bp->b_data + (i << PAGE_SHIFT)); 1045 if (pgs[i]->uobject == uobj && 1046 pgs[i]->offset == uiop->uio_offset + (i << PAGE_SHIFT)) { 1047 KASSERT(pgs[i]->flags & PG_BUSY); 1048 /* 1049 * this page belongs to our object. 1050 */ 1051 simple_lock(&uobj->vmobjlock); 1052 /* 1053 * write out the page stably if it's about to 1054 * be released because we can't resend it 1055 * on the server crash. 1056 * 1057 * XXX assuming PG_RELEASE|PG_PAGEOUT won't be 1058 * changed until unbusy the page. 1059 */ 1060 if (pgs[i]->flags & (PG_RELEASED|PG_PAGEOUT)) 1061 iomode = NFSV3WRITE_FILESYNC; 1062 /* 1063 * if we met a page which hasn't been sent yet, 1064 * we need do WRITE RPC. 1065 */ 1066 if ((pgs[i]->flags & PG_NEEDCOMMIT) == 0) 1067 needcommit = FALSE; 1068 simple_unlock(&uobj->vmobjlock); 1069 } else { 1070 iomode = NFSV3WRITE_FILESYNC; 1071 needcommit = FALSE; 1072 } 1073 } 1074 if (!needcommit && iomode == NFSV3WRITE_UNSTABLE) { 1075 simple_lock(&uobj->vmobjlock); 1076 for (i = 0; i < npages; i++) { 1077 pgs[i]->flags |= PG_NEEDCOMMIT | PG_RDONLY; 1078 pmap_page_protect(pgs[i], VM_PROT_READ); 1079 } 1080 simple_unlock(&uobj->vmobjlock); 1081 pageprotected = TRUE; /* pages can't be modified during i/o. */ 1082 } else 1083 pageprotected = FALSE; 1084 1085 /* 1086 * Send the data to the server if necessary, 1087 * otherwise just send a commit rpc. 1088 */ 1089 #ifndef NFS_V2_ONLY 1090 if (needcommit) { 1091 1092 /* 1093 * If the buffer is in the range that we already committed, 1094 * there's nothing to do. 1095 * 1096 * If it's in the range that we need to commit, push the 1097 * whole range at once, otherwise only push the buffer. 1098 * In both these cases, acquire the commit lock to avoid 1099 * other processes modifying the range. 1100 */ 1101 1102 off = uiop->uio_offset; 1103 cnt = bp->b_bcount; 1104 lockmgr(&np->n_commitlock, LK_EXCLUSIVE, NULL); 1105 if (!nfs_in_committed_range(vp, off, bp->b_bcount)) { 1106 boolean_t pushedrange; 1107 if (nfs_in_tobecommitted_range(vp, off, bp->b_bcount)) { 1108 pushedrange = TRUE; 1109 off = np->n_pushlo; 1110 cnt = np->n_pushhi - np->n_pushlo; 1111 } else { 1112 pushedrange = FALSE; 1113 } 1114 error = nfs_commit(vp, off, cnt, curproc); 1115 if (error == 0) { 1116 if (pushedrange) { 1117 nfs_merge_commit_ranges(vp); 1118 } else { 1119 nfs_add_committed_range(vp, off, cnt); 1120 } 1121 } 1122 } else { 1123 error = 0; 1124 } 1125 lockmgr(&np->n_commitlock, LK_RELEASE, NULL); 1126 lockmgr(&nmp->nm_writeverflock, LK_RELEASE, NULL); 1127 if (!error) { 1128 /* 1129 * pages are now on stable storage. 1130 */ 1131 uiop->uio_resid = 0; 1132 simple_lock(&uobj->vmobjlock); 1133 for (i = 0; i < npages; i++) { 1134 pgs[i]->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY); 1135 } 1136 simple_unlock(&uobj->vmobjlock); 1137 return 0; 1138 } else if (error == NFSERR_STALEWRITEVERF) { 1139 nfs_clearcommit(vp->v_mount); 1140 goto again; 1141 } 1142 if (error) { 1143 bp->b_flags |= B_ERROR; 1144 bp->b_error = np->n_error = error; 1145 np->n_flag |= NWRITEERR; 1146 } 1147 return error; 1148 } 1149 #endif 1150 off = uiop->uio_offset; 1151 cnt = bp->b_bcount; 1152 uiop->uio_rw = UIO_WRITE; 1153 nfsstats.write_bios++; 1154 error = nfs_writerpc(vp, uiop, &iomode, pageprotected, &stalewriteverf); 1155 #ifndef NFS_V2_ONLY 1156 if (!error && iomode == NFSV3WRITE_UNSTABLE) { 1157 /* 1158 * we need to commit pages later. 1159 */ 1160 lockmgr(&np->n_commitlock, LK_EXCLUSIVE, NULL); 1161 nfs_add_tobecommitted_range(vp, off, cnt); 1162 /* 1163 * if there can be too many uncommitted pages, commit them now. 1164 */ 1165 if (np->n_pushhi - np->n_pushlo > nfs_commitsize) { 1166 off = np->n_pushlo; 1167 cnt = nfs_commitsize >> 1; 1168 error = nfs_commit(vp, off, cnt, curproc); 1169 if (!error) { 1170 nfs_add_committed_range(vp, off, cnt); 1171 nfs_del_tobecommitted_range(vp, off, cnt); 1172 } 1173 if (error == NFSERR_STALEWRITEVERF) { 1174 stalewriteverf = TRUE; 1175 error = 0; /* it isn't a real error */ 1176 } 1177 } else { 1178 /* 1179 * re-dirty pages so that they will be passed 1180 * to us later again. 1181 */ 1182 simple_lock(&uobj->vmobjlock); 1183 for (i = 0; i < npages; i++) { 1184 pgs[i]->flags &= ~PG_CLEAN; 1185 } 1186 simple_unlock(&uobj->vmobjlock); 1187 } 1188 lockmgr(&np->n_commitlock, LK_RELEASE, NULL); 1189 } else 1190 #endif 1191 if (!error) { 1192 /* 1193 * pages are now on stable storage. 1194 */ 1195 lockmgr(&np->n_commitlock, LK_EXCLUSIVE, NULL); 1196 nfs_del_committed_range(vp, off, cnt); 1197 lockmgr(&np->n_commitlock, LK_RELEASE, NULL); 1198 simple_lock(&uobj->vmobjlock); 1199 for (i = 0; i < npages; i++) { 1200 pgs[i]->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY); 1201 } 1202 simple_unlock(&uobj->vmobjlock); 1203 } else { 1204 /* 1205 * we got an error. 1206 */ 1207 bp->b_flags |= B_ERROR; 1208 bp->b_error = np->n_error = error; 1209 np->n_flag |= NWRITEERR; 1210 } 1211 1212 lockmgr(&nmp->nm_writeverflock, LK_RELEASE, NULL); 1213 1214 if (stalewriteverf) { 1215 nfs_clearcommit(vp->v_mount); 1216 } 1217 return error; 1218 } 1219 1220 /* 1221 * nfs_doio for B_PHYS. 1222 */ 1223 static int 1224 nfs_doio_phys(bp, uiop) 1225 struct buf *bp; 1226 struct uio *uiop; 1227 { 1228 struct vnode *vp = bp->b_vp; 1229 int error; 1230 1231 uiop->uio_offset = ((off_t)bp->b_blkno) << DEV_BSHIFT; 1232 if (bp->b_flags & B_READ) { 1233 uiop->uio_rw = UIO_READ; 1234 nfsstats.read_physios++; 1235 error = nfs_readrpc(vp, uiop); 1236 } else { 1237 int iomode = NFSV3WRITE_DATASYNC; 1238 boolean_t stalewriteverf; 1239 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1240 1241 uiop->uio_rw = UIO_WRITE; 1242 nfsstats.write_physios++; 1243 lockmgr(&nmp->nm_writeverflock, LK_SHARED, NULL); 1244 error = nfs_writerpc(vp, uiop, &iomode, FALSE, &stalewriteverf); 1245 lockmgr(&nmp->nm_writeverflock, LK_RELEASE, NULL); 1246 if (stalewriteverf) { 1247 nfs_clearcommit(bp->b_vp->v_mount); 1248 } 1249 } 1250 if (error) { 1251 bp->b_flags |= B_ERROR; 1252 bp->b_error = error; 1253 } 1254 return error; 1255 } 1256 1257 /* 1258 * Do an I/O operation to/from a cache block. This may be called 1259 * synchronously or from an nfsiod. 1260 */ 1261 int 1262 nfs_doio(bp, p) 1263 struct buf *bp; 1264 struct proc *p; 1265 { 1266 int error; 1267 struct uio uio; 1268 struct uio *uiop = &uio; 1269 struct iovec io; 1270 UVMHIST_FUNC("nfs_doio"); UVMHIST_CALLED(ubchist); 1271 1272 uiop->uio_iov = &io; 1273 uiop->uio_iovcnt = 1; 1274 uiop->uio_segflg = UIO_SYSSPACE; 1275 uiop->uio_procp = NULL; 1276 uiop->uio_offset = (((off_t)bp->b_blkno) << DEV_BSHIFT); 1277 io.iov_base = bp->b_data; 1278 io.iov_len = uiop->uio_resid = bp->b_bcount; 1279 1280 /* 1281 * Historically, paging was done with physio, but no more... 1282 */ 1283 if (bp->b_flags & B_PHYS) { 1284 /* 1285 * ...though reading /dev/drum still gets us here. 1286 */ 1287 error = nfs_doio_phys(bp, uiop); 1288 } else if (bp->b_flags & B_READ) { 1289 error = nfs_doio_read(bp, uiop); 1290 } else { 1291 error = nfs_doio_write(bp, uiop); 1292 } 1293 bp->b_resid = uiop->uio_resid; 1294 biodone(bp); 1295 return (error); 1296 } 1297 1298 /* 1299 * Vnode op for VM getpages. 1300 */ 1301 1302 int 1303 nfs_getpages(v) 1304 void *v; 1305 { 1306 struct vop_getpages_args /* { 1307 struct vnode *a_vp; 1308 voff_t a_offset; 1309 struct vm_page **a_m; 1310 int *a_count; 1311 int a_centeridx; 1312 vm_prot_t a_access_type; 1313 int a_advice; 1314 int a_flags; 1315 } */ *ap = v; 1316 1317 struct vnode *vp = ap->a_vp; 1318 struct uvm_object *uobj = &vp->v_uobj; 1319 struct nfsnode *np = VTONFS(vp); 1320 const int npages = *ap->a_count; 1321 struct vm_page *pg, **pgs, *opgs[npages]; 1322 off_t origoffset, len; 1323 int i, error; 1324 boolean_t v3 = NFS_ISV3(vp); 1325 boolean_t write = (ap->a_access_type & VM_PROT_WRITE) != 0; 1326 boolean_t locked = (ap->a_flags & PGO_LOCKED) != 0; 1327 1328 /* 1329 * call the genfs code to get the pages. `pgs' may be NULL 1330 * when doing read-ahead. 1331 */ 1332 1333 pgs = ap->a_m; 1334 if (write && locked && v3) { 1335 KASSERT(pgs != NULL); 1336 #ifdef DEBUG 1337 1338 /* 1339 * If PGO_LOCKED is set, real pages shouldn't exists 1340 * in the array. 1341 */ 1342 1343 for (i = 0; i < npages; i++) 1344 KDASSERT(pgs[i] == NULL || pgs[i] == PGO_DONTCARE); 1345 #endif 1346 memcpy(opgs, pgs, npages * sizeof(struct vm_pages *)); 1347 } 1348 error = genfs_getpages(v); 1349 if (error) { 1350 return (error); 1351 } 1352 1353 /* 1354 * for read faults where the nfs node is not yet marked NMODIFIED, 1355 * set PG_RDONLY on the pages so that we come back here if someone 1356 * tries to modify later via the mapping that will be entered for 1357 * this fault. 1358 */ 1359 1360 if (!write && (np->n_flag & NMODIFIED) == 0 && pgs != NULL) { 1361 if (!locked) { 1362 simple_lock(&uobj->vmobjlock); 1363 } 1364 for (i = 0; i < npages; i++) { 1365 pg = pgs[i]; 1366 if (pg == NULL || pg == PGO_DONTCARE) { 1367 continue; 1368 } 1369 pg->flags |= PG_RDONLY; 1370 } 1371 if (!locked) { 1372 simple_unlock(&uobj->vmobjlock); 1373 } 1374 } 1375 if (!write) { 1376 return (0); 1377 } 1378 1379 /* 1380 * this is a write fault, update the commit info. 1381 */ 1382 1383 origoffset = ap->a_offset; 1384 len = npages << PAGE_SHIFT; 1385 1386 if (v3) { 1387 error = lockmgr(&np->n_commitlock, 1388 LK_EXCLUSIVE | (locked ? LK_NOWAIT : 0), NULL); 1389 if (error) { 1390 KASSERT(locked != 0); 1391 1392 /* 1393 * Since PGO_LOCKED is set, we need to unbusy 1394 * all pages fetched by genfs_getpages() above, 1395 * tell the caller that there are no pages 1396 * available and put back original pgs array. 1397 */ 1398 1399 uvm_lock_pageq(); 1400 uvm_page_unbusy(pgs, npages); 1401 uvm_unlock_pageq(); 1402 *ap->a_count = 0; 1403 memcpy(pgs, opgs, 1404 npages * sizeof(struct vm_pages *)); 1405 return (error); 1406 } 1407 nfs_del_committed_range(vp, origoffset, len); 1408 nfs_del_tobecommitted_range(vp, origoffset, len); 1409 } 1410 np->n_flag |= NMODIFIED; 1411 if (!locked) { 1412 simple_lock(&uobj->vmobjlock); 1413 } 1414 for (i = 0; i < npages; i++) { 1415 pg = pgs[i]; 1416 if (pg == NULL || pg == PGO_DONTCARE) { 1417 continue; 1418 } 1419 pg->flags &= ~(PG_NEEDCOMMIT | PG_RDONLY); 1420 } 1421 if (!locked) { 1422 simple_unlock(&uobj->vmobjlock); 1423 } 1424 if (v3) { 1425 lockmgr(&np->n_commitlock, LK_RELEASE, NULL); 1426 } 1427 return (0); 1428 }
Cache object: ef31e318f57edbb62537bb97b107938d
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]