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sys/fs/nfsclient/nfs_clbio.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/bio.h> 43 #include <sys/buf.h> 44 #include <sys/kernel.h> 45 #include <sys/mount.h> 46 #include <sys/rwlock.h> 47 #include <sys/vmmeter.h> 48 #include <sys/vnode.h> 49 50 #include <vm/vm.h> 51 #include <vm/vm_param.h> 52 #include <vm/vm_extern.h> 53 #include <vm/vm_page.h> 54 #include <vm/vm_object.h> 55 #include <vm/vm_pager.h> 56 #include <vm/vnode_pager.h> 57 58 #include <fs/nfs/nfsport.h> 59 #include <fs/nfsclient/nfsmount.h> 60 #include <fs/nfsclient/nfs.h> 61 #include <fs/nfsclient/nfsnode.h> 62 #include <fs/nfsclient/nfs_kdtrace.h> 63 64 extern int newnfs_directio_allow_mmap; 65 extern struct nfsstatsv1 nfsstatsv1; 66 extern struct mtx ncl_iod_mutex; 67 extern int ncl_numasync; 68 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON]; 69 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON]; 70 extern int newnfs_directio_enable; 71 extern int nfs_keep_dirty_on_error; 72 73 uma_zone_t ncl_pbuf_zone; 74 75 static struct buf *nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, 76 struct thread *td); 77 static int nfs_directio_write(struct vnode *vp, struct uio *uiop, 78 struct ucred *cred, int ioflag); 79 80 /* 81 * Vnode op for VM getpages. 82 */ 83 SYSCTL_DECL(_vfs_nfs); 84 static int use_buf_pager = 1; 85 SYSCTL_INT(_vfs_nfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN, 86 &use_buf_pager, 0, 87 "Use buffer pager instead of direct readrpc call"); 88 89 static daddr_t 90 ncl_gbp_getblkno(struct vnode *vp, vm_ooffset_t off) 91 { 92 93 return (off / vp->v_bufobj.bo_bsize); 94 } 95 96 static int 97 ncl_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz) 98 { 99 struct nfsnode *np; 100 u_quad_t nsize; 101 int biosize, bcount; 102 103 np = VTONFS(vp); 104 NFSLOCKNODE(np); 105 nsize = np->n_size; 106 NFSUNLOCKNODE(np); 107 108 biosize = vp->v_bufobj.bo_bsize; 109 bcount = biosize; 110 if ((off_t)lbn * biosize >= nsize) 111 bcount = 0; 112 else if ((off_t)(lbn + 1) * biosize > nsize) 113 bcount = nsize - (off_t)lbn * biosize; 114 *sz = bcount; 115 return (0); 116 } 117 118 int 119 ncl_getpages(struct vop_getpages_args *ap) 120 { 121 int i, error, nextoff, size, toff, count, npages; 122 struct uio uio; 123 struct iovec iov; 124 vm_offset_t kva; 125 struct buf *bp; 126 struct vnode *vp; 127 struct thread *td; 128 struct ucred *cred; 129 struct nfsmount *nmp; 130 vm_object_t object; 131 vm_page_t *pages; 132 struct nfsnode *np; 133 134 vp = ap->a_vp; 135 np = VTONFS(vp); 136 td = curthread; 137 cred = curthread->td_ucred; 138 nmp = VFSTONFS(vp->v_mount); 139 pages = ap->a_m; 140 npages = ap->a_count; 141 142 if ((object = vp->v_object) == NULL) { 143 printf("ncl_getpages: called with non-merged cache vnode\n"); 144 return (VM_PAGER_ERROR); 145 } 146 147 if (newnfs_directio_enable && !newnfs_directio_allow_mmap) { 148 NFSLOCKNODE(np); 149 if ((np->n_flag & NNONCACHE) && (vp->v_type == VREG)) { 150 NFSUNLOCKNODE(np); 151 printf("ncl_getpages: called on non-cacheable vnode\n"); 152 return (VM_PAGER_ERROR); 153 } else 154 NFSUNLOCKNODE(np); 155 } 156 157 mtx_lock(&nmp->nm_mtx); 158 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 && 159 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 160 mtx_unlock(&nmp->nm_mtx); 161 /* We'll never get here for v4, because we always have fsinfo */ 162 (void)ncl_fsinfo(nmp, vp, cred, td); 163 } else 164 mtx_unlock(&nmp->nm_mtx); 165 166 if (use_buf_pager) 167 return (vfs_bio_getpages(vp, pages, npages, ap->a_rbehind, 168 ap->a_rahead, ncl_gbp_getblkno, ncl_gbp_getblksz)); 169 170 /* 171 * If the requested page is partially valid, just return it and 172 * allow the pager to zero-out the blanks. Partially valid pages 173 * can only occur at the file EOF. 174 * 175 * XXXGL: is that true for NFS, where short read can occur??? 176 */ 177 VM_OBJECT_WLOCK(object); 178 if (!vm_page_none_valid(pages[npages - 1]) && --npages == 0) 179 goto out; 180 VM_OBJECT_WUNLOCK(object); 181 182 /* 183 * We use only the kva address for the buffer, but this is extremely 184 * convenient and fast. 185 */ 186 bp = uma_zalloc(ncl_pbuf_zone, M_WAITOK); 187 188 kva = (vm_offset_t) bp->b_data; 189 pmap_qenter(kva, pages, npages); 190 VM_CNT_INC(v_vnodein); 191 VM_CNT_ADD(v_vnodepgsin, npages); 192 193 count = npages << PAGE_SHIFT; 194 iov.iov_base = (caddr_t) kva; 195 iov.iov_len = count; 196 uio.uio_iov = &iov; 197 uio.uio_iovcnt = 1; 198 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 199 uio.uio_resid = count; 200 uio.uio_segflg = UIO_SYSSPACE; 201 uio.uio_rw = UIO_READ; 202 uio.uio_td = td; 203 204 error = ncl_readrpc(vp, &uio, cred); 205 pmap_qremove(kva, npages); 206 207 uma_zfree(ncl_pbuf_zone, bp); 208 209 if (error && (uio.uio_resid == count)) { 210 printf("ncl_getpages: error %d\n", error); 211 return (VM_PAGER_ERROR); 212 } 213 214 /* 215 * Calculate the number of bytes read and validate only that number 216 * of bytes. Note that due to pending writes, size may be 0. This 217 * does not mean that the remaining data is invalid! 218 */ 219 220 size = count - uio.uio_resid; 221 VM_OBJECT_WLOCK(object); 222 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 223 vm_page_t m; 224 nextoff = toff + PAGE_SIZE; 225 m = pages[i]; 226 227 if (nextoff <= size) { 228 /* 229 * Read operation filled an entire page 230 */ 231 vm_page_valid(m); 232 KASSERT(m->dirty == 0, 233 ("nfs_getpages: page %p is dirty", m)); 234 } else if (size > toff) { 235 /* 236 * Read operation filled a partial page. 237 */ 238 vm_page_invalid(m); 239 vm_page_set_valid_range(m, 0, size - toff); 240 KASSERT(m->dirty == 0, 241 ("nfs_getpages: page %p is dirty", m)); 242 } else { 243 /* 244 * Read operation was short. If no error 245 * occurred we may have hit a zero-fill 246 * section. We leave valid set to 0, and page 247 * is freed by vm_page_readahead_finish() if 248 * its index is not equal to requested, or 249 * page is zeroed and set valid by 250 * vm_pager_get_pages() for requested page. 251 */ 252 ; 253 } 254 } 255 out: 256 VM_OBJECT_WUNLOCK(object); 257 if (ap->a_rbehind) 258 *ap->a_rbehind = 0; 259 if (ap->a_rahead) 260 *ap->a_rahead = 0; 261 return (VM_PAGER_OK); 262 } 263 264 /* 265 * Vnode op for VM putpages. 266 */ 267 int 268 ncl_putpages(struct vop_putpages_args *ap) 269 { 270 struct uio uio; 271 struct iovec iov; 272 int i, error, npages, count; 273 off_t offset; 274 int *rtvals; 275 struct vnode *vp; 276 struct thread *td; 277 struct ucred *cred; 278 struct nfsmount *nmp; 279 struct nfsnode *np; 280 vm_page_t *pages; 281 282 vp = ap->a_vp; 283 np = VTONFS(vp); 284 td = curthread; /* XXX */ 285 /* Set the cred to n_writecred for the write rpcs. */ 286 if (np->n_writecred != NULL) 287 cred = crhold(np->n_writecred); 288 else 289 cred = crhold(curthread->td_ucred); /* XXX */ 290 nmp = VFSTONFS(vp->v_mount); 291 pages = ap->a_m; 292 count = ap->a_count; 293 rtvals = ap->a_rtvals; 294 npages = btoc(count); 295 offset = IDX_TO_OFF(pages[0]->pindex); 296 297 mtx_lock(&nmp->nm_mtx); 298 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 && 299 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 300 mtx_unlock(&nmp->nm_mtx); 301 (void)ncl_fsinfo(nmp, vp, cred, td); 302 } else 303 mtx_unlock(&nmp->nm_mtx); 304 305 NFSLOCKNODE(np); 306 if (newnfs_directio_enable && !newnfs_directio_allow_mmap && 307 (np->n_flag & NNONCACHE) && (vp->v_type == VREG)) { 308 NFSUNLOCKNODE(np); 309 printf("ncl_putpages: called on noncache-able vnode\n"); 310 NFSLOCKNODE(np); 311 } 312 /* 313 * When putting pages, do not extend file past EOF. 314 */ 315 if (offset + count > np->n_size) { 316 count = np->n_size - offset; 317 if (count < 0) 318 count = 0; 319 } 320 NFSUNLOCKNODE(np); 321 322 for (i = 0; i < npages; i++) 323 rtvals[i] = VM_PAGER_ERROR; 324 325 VM_CNT_INC(v_vnodeout); 326 VM_CNT_ADD(v_vnodepgsout, count); 327 328 iov.iov_base = unmapped_buf; 329 iov.iov_len = count; 330 uio.uio_iov = &iov; 331 uio.uio_iovcnt = 1; 332 uio.uio_offset = offset; 333 uio.uio_resid = count; 334 uio.uio_segflg = UIO_NOCOPY; 335 uio.uio_rw = UIO_WRITE; 336 uio.uio_td = td; 337 338 error = VOP_WRITE(vp, &uio, vnode_pager_putpages_ioflags(ap->a_sync), 339 cred); 340 crfree(cred); 341 342 if (error == 0 || !nfs_keep_dirty_on_error) { 343 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid, 344 np->n_size - offset, npages * PAGE_SIZE); 345 } 346 return (rtvals[0]); 347 } 348 349 /* 350 * For nfs, cache consistency can only be maintained approximately. 351 * Although RFC1094 does not specify the criteria, the following is 352 * believed to be compatible with the reference port. 353 * For nfs: 354 * If the file's modify time on the server has changed since the 355 * last read rpc or you have written to the file, 356 * you may have lost data cache consistency with the 357 * server, so flush all of the file's data out of the cache. 358 * Then force a getattr rpc to ensure that you have up to date 359 * attributes. 360 * NB: This implies that cache data can be read when up to 361 * NFS_ATTRTIMEO seconds out of date. If you find that you need current 362 * attributes this could be forced by setting n_attrstamp to 0 before 363 * the VOP_GETATTR() call. 364 */ 365 static inline int 366 nfs_bioread_check_cons(struct vnode *vp, struct thread *td, struct ucred *cred) 367 { 368 int error = 0; 369 struct vattr vattr; 370 struct nfsnode *np = VTONFS(vp); 371 bool old_lock; 372 373 /* 374 * Ensure the exclusove access to the node before checking 375 * whether the cache is consistent. 376 */ 377 old_lock = ncl_excl_start(vp); 378 NFSLOCKNODE(np); 379 if (np->n_flag & NMODIFIED) { 380 NFSUNLOCKNODE(np); 381 if (vp->v_type != VREG) { 382 if (vp->v_type != VDIR) 383 panic("nfs: bioread, not dir"); 384 ncl_invaldir(vp); 385 error = ncl_vinvalbuf(vp, V_SAVE | V_ALLOWCLEAN, td, 1); 386 if (error != 0) 387 goto out; 388 } 389 np->n_attrstamp = 0; 390 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 391 error = VOP_GETATTR(vp, &vattr, cred); 392 if (error) 393 goto out; 394 NFSLOCKNODE(np); 395 np->n_mtime = vattr.va_mtime; 396 NFSUNLOCKNODE(np); 397 } else { 398 NFSUNLOCKNODE(np); 399 error = VOP_GETATTR(vp, &vattr, cred); 400 if (error) 401 goto out; 402 NFSLOCKNODE(np); 403 if ((np->n_flag & NSIZECHANGED) 404 || (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime))) { 405 NFSUNLOCKNODE(np); 406 if (vp->v_type == VDIR) 407 ncl_invaldir(vp); 408 error = ncl_vinvalbuf(vp, V_SAVE | V_ALLOWCLEAN, td, 1); 409 if (error != 0) 410 goto out; 411 NFSLOCKNODE(np); 412 np->n_mtime = vattr.va_mtime; 413 np->n_flag &= ~NSIZECHANGED; 414 } 415 NFSUNLOCKNODE(np); 416 } 417 out: 418 ncl_excl_finish(vp, old_lock); 419 return (error); 420 } 421 422 /* 423 * Vnode op for read using bio 424 */ 425 int 426 ncl_bioread(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred) 427 { 428 struct nfsnode *np = VTONFS(vp); 429 struct buf *bp, *rabp; 430 struct thread *td; 431 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 432 daddr_t lbn, rabn; 433 int biosize, bcount, error, i, n, nra, on, save2, seqcount; 434 off_t tmp_off; 435 436 KASSERT(uio->uio_rw == UIO_READ, ("ncl_read mode")); 437 if (uio->uio_resid == 0) 438 return (0); 439 if (uio->uio_offset < 0) /* XXX VDIR cookies can be negative */ 440 return (EINVAL); 441 td = uio->uio_td; 442 443 mtx_lock(&nmp->nm_mtx); 444 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 && 445 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 446 mtx_unlock(&nmp->nm_mtx); 447 (void)ncl_fsinfo(nmp, vp, cred, td); 448 mtx_lock(&nmp->nm_mtx); 449 } 450 if (nmp->nm_rsize == 0 || nmp->nm_readdirsize == 0) 451 (void) newnfs_iosize(nmp); 452 453 tmp_off = uio->uio_offset + uio->uio_resid; 454 if (vp->v_type != VDIR && 455 (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)) { 456 mtx_unlock(&nmp->nm_mtx); 457 return (EFBIG); 458 } 459 mtx_unlock(&nmp->nm_mtx); 460 461 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && (vp->v_type == VREG)) 462 /* No caching/ no readaheads. Just read data into the user buffer */ 463 return ncl_readrpc(vp, uio, cred); 464 465 n = 0; 466 on = 0; 467 biosize = vp->v_bufobj.bo_bsize; 468 seqcount = (int)((off_t)(ioflag >> IO_SEQSHIFT) * biosize / BKVASIZE); 469 470 error = nfs_bioread_check_cons(vp, td, cred); 471 if (error) 472 return error; 473 474 save2 = curthread_pflags2_set(TDP2_SBPAGES); 475 do { 476 u_quad_t nsize; 477 478 NFSLOCKNODE(np); 479 nsize = np->n_size; 480 NFSUNLOCKNODE(np); 481 482 switch (vp->v_type) { 483 case VREG: 484 NFSINCRGLOBAL(nfsstatsv1.biocache_reads); 485 lbn = uio->uio_offset / biosize; 486 on = uio->uio_offset - (lbn * biosize); 487 488 /* 489 * Start the read ahead(s), as required. 490 */ 491 if (nmp->nm_readahead > 0) { 492 for (nra = 0; nra < nmp->nm_readahead && nra < seqcount && 493 (off_t)(lbn + 1 + nra) * biosize < nsize; nra++) { 494 rabn = lbn + 1 + nra; 495 if (incore(&vp->v_bufobj, rabn) == NULL) { 496 rabp = nfs_getcacheblk(vp, rabn, biosize, td); 497 if (!rabp) { 498 error = newnfs_sigintr(nmp, td); 499 if (error == 0) 500 error = EINTR; 501 goto out; 502 } 503 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) { 504 rabp->b_flags |= B_ASYNC; 505 rabp->b_iocmd = BIO_READ; 506 vfs_busy_pages(rabp, 0); 507 if (ncl_asyncio(nmp, rabp, cred, td)) { 508 rabp->b_flags |= B_INVAL; 509 rabp->b_ioflags |= BIO_ERROR; 510 vfs_unbusy_pages(rabp); 511 brelse(rabp); 512 break; 513 } 514 } else { 515 brelse(rabp); 516 } 517 } 518 } 519 } 520 521 /* Note that bcount is *not* DEV_BSIZE aligned. */ 522 bcount = biosize; 523 if ((off_t)lbn * biosize >= nsize) { 524 bcount = 0; 525 } else if ((off_t)(lbn + 1) * biosize > nsize) { 526 bcount = nsize - (off_t)lbn * biosize; 527 } 528 bp = nfs_getcacheblk(vp, lbn, bcount, td); 529 530 if (!bp) { 531 error = newnfs_sigintr(nmp, td); 532 if (error == 0) 533 error = EINTR; 534 goto out; 535 } 536 537 /* 538 * If B_CACHE is not set, we must issue the read. If this 539 * fails, we return an error. 540 */ 541 542 if ((bp->b_flags & B_CACHE) == 0) { 543 bp->b_iocmd = BIO_READ; 544 vfs_busy_pages(bp, 0); 545 error = ncl_doio(vp, bp, cred, td, 0); 546 if (error) { 547 brelse(bp); 548 goto out; 549 } 550 } 551 552 /* 553 * on is the offset into the current bp. Figure out how many 554 * bytes we can copy out of the bp. Note that bcount is 555 * NOT DEV_BSIZE aligned. 556 * 557 * Then figure out how many bytes we can copy into the uio. 558 */ 559 560 n = 0; 561 if (on < bcount) 562 n = MIN((unsigned)(bcount - on), uio->uio_resid); 563 break; 564 case VLNK: 565 NFSINCRGLOBAL(nfsstatsv1.biocache_readlinks); 566 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, td); 567 if (!bp) { 568 error = newnfs_sigintr(nmp, td); 569 if (error == 0) 570 error = EINTR; 571 goto out; 572 } 573 if ((bp->b_flags & B_CACHE) == 0) { 574 bp->b_iocmd = BIO_READ; 575 vfs_busy_pages(bp, 0); 576 error = ncl_doio(vp, bp, cred, td, 0); 577 if (error) { 578 bp->b_ioflags |= BIO_ERROR; 579 brelse(bp); 580 goto out; 581 } 582 } 583 n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid); 584 on = 0; 585 break; 586 case VDIR: 587 NFSINCRGLOBAL(nfsstatsv1.biocache_readdirs); 588 NFSLOCKNODE(np); 589 if (np->n_direofoffset 590 && uio->uio_offset >= np->n_direofoffset) { 591 NFSUNLOCKNODE(np); 592 error = 0; 593 goto out; 594 } 595 NFSUNLOCKNODE(np); 596 lbn = (uoff_t)uio->uio_offset / NFS_DIRBLKSIZ; 597 on = uio->uio_offset & (NFS_DIRBLKSIZ - 1); 598 bp = nfs_getcacheblk(vp, lbn, NFS_DIRBLKSIZ, td); 599 if (!bp) { 600 error = newnfs_sigintr(nmp, td); 601 if (error == 0) 602 error = EINTR; 603 goto out; 604 } 605 if ((bp->b_flags & B_CACHE) == 0) { 606 bp->b_iocmd = BIO_READ; 607 vfs_busy_pages(bp, 0); 608 error = ncl_doio(vp, bp, cred, td, 0); 609 if (error) { 610 brelse(bp); 611 } 612 while (error == NFSERR_BAD_COOKIE) { 613 ncl_invaldir(vp); 614 error = ncl_vinvalbuf(vp, 0, td, 1); 615 616 /* 617 * Yuck! The directory has been modified on the 618 * server. The only way to get the block is by 619 * reading from the beginning to get all the 620 * offset cookies. 621 * 622 * Leave the last bp intact unless there is an error. 623 * Loop back up to the while if the error is another 624 * NFSERR_BAD_COOKIE (double yuch!). 625 */ 626 for (i = 0; i <= lbn && !error; i++) { 627 NFSLOCKNODE(np); 628 if (np->n_direofoffset 629 && (i * NFS_DIRBLKSIZ) >= np->n_direofoffset) { 630 NFSUNLOCKNODE(np); 631 error = 0; 632 goto out; 633 } 634 NFSUNLOCKNODE(np); 635 bp = nfs_getcacheblk(vp, i, NFS_DIRBLKSIZ, td); 636 if (!bp) { 637 error = newnfs_sigintr(nmp, td); 638 if (error == 0) 639 error = EINTR; 640 goto out; 641 } 642 if ((bp->b_flags & B_CACHE) == 0) { 643 bp->b_iocmd = BIO_READ; 644 vfs_busy_pages(bp, 0); 645 error = ncl_doio(vp, bp, cred, td, 0); 646 /* 647 * no error + B_INVAL == directory EOF, 648 * use the block. 649 */ 650 if (error == 0 && (bp->b_flags & B_INVAL)) 651 break; 652 } 653 /* 654 * An error will throw away the block and the 655 * for loop will break out. If no error and this 656 * is not the block we want, we throw away the 657 * block and go for the next one via the for loop. 658 */ 659 if (error || i < lbn) 660 brelse(bp); 661 } 662 } 663 /* 664 * The above while is repeated if we hit another cookie 665 * error. If we hit an error and it wasn't a cookie error, 666 * we give up. 667 */ 668 if (error) 669 goto out; 670 } 671 672 /* 673 * If not eof and read aheads are enabled, start one. 674 * (You need the current block first, so that you have the 675 * directory offset cookie of the next block.) 676 */ 677 NFSLOCKNODE(np); 678 if (nmp->nm_readahead > 0 && 679 (bp->b_flags & B_INVAL) == 0 && 680 (np->n_direofoffset == 0 || 681 (lbn + 1) * NFS_DIRBLKSIZ < np->n_direofoffset) && 682 incore(&vp->v_bufobj, lbn + 1) == NULL) { 683 NFSUNLOCKNODE(np); 684 rabp = nfs_getcacheblk(vp, lbn + 1, NFS_DIRBLKSIZ, td); 685 if (rabp) { 686 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) { 687 rabp->b_flags |= B_ASYNC; 688 rabp->b_iocmd = BIO_READ; 689 vfs_busy_pages(rabp, 0); 690 if (ncl_asyncio(nmp, rabp, cred, td)) { 691 rabp->b_flags |= B_INVAL; 692 rabp->b_ioflags |= BIO_ERROR; 693 vfs_unbusy_pages(rabp); 694 brelse(rabp); 695 } 696 } else { 697 brelse(rabp); 698 } 699 } 700 NFSLOCKNODE(np); 701 } 702 /* 703 * Unlike VREG files, whos buffer size ( bp->b_bcount ) is 704 * chopped for the EOF condition, we cannot tell how large 705 * NFS directories are going to be until we hit EOF. So 706 * an NFS directory buffer is *not* chopped to its EOF. Now, 707 * it just so happens that b_resid will effectively chop it 708 * to EOF. *BUT* this information is lost if the buffer goes 709 * away and is reconstituted into a B_CACHE state ( due to 710 * being VMIO ) later. So we keep track of the directory eof 711 * in np->n_direofoffset and chop it off as an extra step 712 * right here. 713 */ 714 n = lmin(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid - on); 715 if (np->n_direofoffset && n > np->n_direofoffset - uio->uio_offset) 716 n = np->n_direofoffset - uio->uio_offset; 717 NFSUNLOCKNODE(np); 718 break; 719 default: 720 printf(" ncl_bioread: type %x unexpected\n", vp->v_type); 721 bp = NULL; 722 break; 723 } 724 725 if (n > 0) { 726 error = vn_io_fault_uiomove(bp->b_data + on, (int)n, uio); 727 } 728 if (vp->v_type == VLNK) 729 n = 0; 730 if (bp != NULL) 731 brelse(bp); 732 } while (error == 0 && uio->uio_resid > 0 && n > 0); 733 out: 734 curthread_pflags2_restore(save2); 735 if ((curthread->td_pflags2 & TDP2_SBPAGES) == 0) { 736 NFSLOCKNODE(np); 737 ncl_pager_setsize(vp, NULL); 738 } 739 return (error); 740 } 741 742 /* 743 * The NFS write path cannot handle iovecs with len > 1. So we need to 744 * break up iovecs accordingly (restricting them to wsize). 745 * For the SYNC case, we can do this with 1 copy (user buffer -> mbuf). 746 * For the ASYNC case, 2 copies are needed. The first a copy from the 747 * user buffer to a staging buffer and then a second copy from the staging 748 * buffer to mbufs. This can be optimized by copying from the user buffer 749 * directly into mbufs and passing the chain down, but that requires a 750 * fair amount of re-working of the relevant codepaths (and can be done 751 * later). 752 */ 753 static int 754 nfs_directio_write(vp, uiop, cred, ioflag) 755 struct vnode *vp; 756 struct uio *uiop; 757 struct ucred *cred; 758 int ioflag; 759 { 760 int error; 761 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 762 struct thread *td = uiop->uio_td; 763 int size; 764 int wsize; 765 766 mtx_lock(&nmp->nm_mtx); 767 wsize = nmp->nm_wsize; 768 mtx_unlock(&nmp->nm_mtx); 769 if (ioflag & IO_SYNC) { 770 int iomode, must_commit; 771 struct uio uio; 772 struct iovec iov; 773 do_sync: 774 while (uiop->uio_resid > 0) { 775 size = MIN(uiop->uio_resid, wsize); 776 size = MIN(uiop->uio_iov->iov_len, size); 777 iov.iov_base = uiop->uio_iov->iov_base; 778 iov.iov_len = size; 779 uio.uio_iov = &iov; 780 uio.uio_iovcnt = 1; 781 uio.uio_offset = uiop->uio_offset; 782 uio.uio_resid = size; 783 uio.uio_segflg = UIO_USERSPACE; 784 uio.uio_rw = UIO_WRITE; 785 uio.uio_td = td; 786 iomode = NFSWRITE_FILESYNC; 787 error = ncl_writerpc(vp, &uio, cred, &iomode, 788 &must_commit, 0); 789 KASSERT((must_commit == 0), 790 ("ncl_directio_write: Did not commit write")); 791 if (error) 792 return (error); 793 uiop->uio_offset += size; 794 uiop->uio_resid -= size; 795 if (uiop->uio_iov->iov_len <= size) { 796 uiop->uio_iovcnt--; 797 uiop->uio_iov++; 798 } else { 799 uiop->uio_iov->iov_base = 800 (char *)uiop->uio_iov->iov_base + size; 801 uiop->uio_iov->iov_len -= size; 802 } 803 } 804 } else { 805 struct uio *t_uio; 806 struct iovec *t_iov; 807 struct buf *bp; 808 809 /* 810 * Break up the write into blocksize chunks and hand these 811 * over to nfsiod's for write back. 812 * Unfortunately, this incurs a copy of the data. Since 813 * the user could modify the buffer before the write is 814 * initiated. 815 * 816 * The obvious optimization here is that one of the 2 copies 817 * in the async write path can be eliminated by copying the 818 * data here directly into mbufs and passing the mbuf chain 819 * down. But that will require a fair amount of re-working 820 * of the code and can be done if there's enough interest 821 * in NFS directio access. 822 */ 823 while (uiop->uio_resid > 0) { 824 size = MIN(uiop->uio_resid, wsize); 825 size = MIN(uiop->uio_iov->iov_len, size); 826 bp = uma_zalloc(ncl_pbuf_zone, M_WAITOK); 827 t_uio = malloc(sizeof(struct uio), M_NFSDIRECTIO, M_WAITOK); 828 t_iov = malloc(sizeof(struct iovec), M_NFSDIRECTIO, M_WAITOK); 829 t_iov->iov_base = malloc(size, M_NFSDIRECTIO, M_WAITOK); 830 t_iov->iov_len = size; 831 t_uio->uio_iov = t_iov; 832 t_uio->uio_iovcnt = 1; 833 t_uio->uio_offset = uiop->uio_offset; 834 t_uio->uio_resid = size; 835 t_uio->uio_segflg = UIO_SYSSPACE; 836 t_uio->uio_rw = UIO_WRITE; 837 t_uio->uio_td = td; 838 KASSERT(uiop->uio_segflg == UIO_USERSPACE || 839 uiop->uio_segflg == UIO_SYSSPACE, 840 ("nfs_directio_write: Bad uio_segflg")); 841 if (uiop->uio_segflg == UIO_USERSPACE) { 842 error = copyin(uiop->uio_iov->iov_base, 843 t_iov->iov_base, size); 844 if (error != 0) 845 goto err_free; 846 } else 847 /* 848 * UIO_SYSSPACE may never happen, but handle 849 * it just in case it does. 850 */ 851 bcopy(uiop->uio_iov->iov_base, t_iov->iov_base, 852 size); 853 bp->b_flags |= B_DIRECT; 854 bp->b_iocmd = BIO_WRITE; 855 if (cred != NOCRED) { 856 crhold(cred); 857 bp->b_wcred = cred; 858 } else 859 bp->b_wcred = NOCRED; 860 bp->b_caller1 = (void *)t_uio; 861 bp->b_vp = vp; 862 error = ncl_asyncio(nmp, bp, NOCRED, td); 863 err_free: 864 if (error) { 865 free(t_iov->iov_base, M_NFSDIRECTIO); 866 free(t_iov, M_NFSDIRECTIO); 867 free(t_uio, M_NFSDIRECTIO); 868 bp->b_vp = NULL; 869 uma_zfree(ncl_pbuf_zone, bp); 870 if (error == EINTR) 871 return (error); 872 goto do_sync; 873 } 874 uiop->uio_offset += size; 875 uiop->uio_resid -= size; 876 if (uiop->uio_iov->iov_len <= size) { 877 uiop->uio_iovcnt--; 878 uiop->uio_iov++; 879 } else { 880 uiop->uio_iov->iov_base = 881 (char *)uiop->uio_iov->iov_base + size; 882 uiop->uio_iov->iov_len -= size; 883 } 884 } 885 } 886 return (0); 887 } 888 889 /* 890 * Vnode op for write using bio 891 */ 892 int 893 ncl_write(struct vop_write_args *ap) 894 { 895 int biosize; 896 struct uio *uio = ap->a_uio; 897 struct thread *td = uio->uio_td; 898 struct vnode *vp = ap->a_vp; 899 struct nfsnode *np = VTONFS(vp); 900 struct ucred *cred = ap->a_cred; 901 int ioflag = ap->a_ioflag; 902 struct buf *bp; 903 struct vattr vattr; 904 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 905 daddr_t lbn; 906 int bcount, noncontig_write, obcount; 907 int bp_cached, n, on, error = 0, error1, save2, wouldcommit; 908 size_t orig_resid, local_resid; 909 off_t orig_size, tmp_off; 910 struct timespec ts; 911 912 KASSERT(uio->uio_rw == UIO_WRITE, ("ncl_write mode")); 913 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, 914 ("ncl_write proc")); 915 if (vp->v_type != VREG) 916 return (EIO); 917 NFSLOCKNODE(np); 918 if (np->n_flag & NWRITEERR) { 919 np->n_flag &= ~NWRITEERR; 920 NFSUNLOCKNODE(np); 921 return (np->n_error); 922 } else 923 NFSUNLOCKNODE(np); 924 mtx_lock(&nmp->nm_mtx); 925 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 && 926 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 927 mtx_unlock(&nmp->nm_mtx); 928 (void)ncl_fsinfo(nmp, vp, cred, td); 929 mtx_lock(&nmp->nm_mtx); 930 } 931 if (nmp->nm_wsize == 0) 932 (void) newnfs_iosize(nmp); 933 mtx_unlock(&nmp->nm_mtx); 934 935 /* 936 * Synchronously flush pending buffers if we are in synchronous 937 * mode or if we are appending. 938 */ 939 if (ioflag & (IO_APPEND | IO_SYNC)) { 940 NFSLOCKNODE(np); 941 if (np->n_flag & NMODIFIED) { 942 NFSUNLOCKNODE(np); 943 #ifdef notyet /* Needs matching nonblock semantics elsewhere, too. */ 944 /* 945 * Require non-blocking, synchronous writes to 946 * dirty files to inform the program it needs 947 * to fsync(2) explicitly. 948 */ 949 if (ioflag & IO_NDELAY) 950 return (EAGAIN); 951 #endif 952 np->n_attrstamp = 0; 953 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 954 error = ncl_vinvalbuf(vp, V_SAVE | ((ioflag & 955 IO_VMIO) != 0 ? V_VMIO : 0), td, 1); 956 if (error != 0) 957 return (error); 958 } else 959 NFSUNLOCKNODE(np); 960 } 961 962 orig_resid = uio->uio_resid; 963 NFSLOCKNODE(np); 964 orig_size = np->n_size; 965 NFSUNLOCKNODE(np); 966 967 /* 968 * If IO_APPEND then load uio_offset. We restart here if we cannot 969 * get the append lock. 970 */ 971 if (ioflag & IO_APPEND) { 972 np->n_attrstamp = 0; 973 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 974 error = VOP_GETATTR(vp, &vattr, cred); 975 if (error) 976 return (error); 977 NFSLOCKNODE(np); 978 uio->uio_offset = np->n_size; 979 NFSUNLOCKNODE(np); 980 } 981 982 if (uio->uio_offset < 0) 983 return (EINVAL); 984 tmp_off = uio->uio_offset + uio->uio_resid; 985 if (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset) 986 return (EFBIG); 987 if (uio->uio_resid == 0) 988 return (0); 989 990 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && vp->v_type == VREG) 991 return nfs_directio_write(vp, uio, cred, ioflag); 992 993 /* 994 * Maybe this should be above the vnode op call, but so long as 995 * file servers have no limits, i don't think it matters 996 */ 997 if (vn_rlimit_fsize(vp, uio, td)) 998 return (EFBIG); 999 1000 save2 = curthread_pflags2_set(TDP2_SBPAGES); 1001 biosize = vp->v_bufobj.bo_bsize; 1002 /* 1003 * Find all of this file's B_NEEDCOMMIT buffers. If our writes 1004 * would exceed the local maximum per-file write commit size when 1005 * combined with those, we must decide whether to flush, 1006 * go synchronous, or return error. We don't bother checking 1007 * IO_UNIT -- we just make all writes atomic anyway, as there's 1008 * no point optimizing for something that really won't ever happen. 1009 */ 1010 wouldcommit = 0; 1011 if (!(ioflag & IO_SYNC)) { 1012 int nflag; 1013 1014 NFSLOCKNODE(np); 1015 nflag = np->n_flag; 1016 NFSUNLOCKNODE(np); 1017 if (nflag & NMODIFIED) { 1018 BO_LOCK(&vp->v_bufobj); 1019 if (vp->v_bufobj.bo_dirty.bv_cnt != 0) { 1020 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd, 1021 b_bobufs) { 1022 if (bp->b_flags & B_NEEDCOMMIT) 1023 wouldcommit += bp->b_bcount; 1024 } 1025 } 1026 BO_UNLOCK(&vp->v_bufobj); 1027 } 1028 } 1029 1030 do { 1031 if (!(ioflag & IO_SYNC)) { 1032 wouldcommit += biosize; 1033 if (wouldcommit > nmp->nm_wcommitsize) { 1034 np->n_attrstamp = 0; 1035 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1036 error = ncl_vinvalbuf(vp, V_SAVE | ((ioflag & 1037 IO_VMIO) != 0 ? V_VMIO : 0), td, 1); 1038 if (error != 0) 1039 goto out; 1040 wouldcommit = biosize; 1041 } 1042 } 1043 1044 NFSINCRGLOBAL(nfsstatsv1.biocache_writes); 1045 lbn = uio->uio_offset / biosize; 1046 on = uio->uio_offset - (lbn * biosize); 1047 n = MIN((unsigned)(biosize - on), uio->uio_resid); 1048 again: 1049 /* 1050 * Handle direct append and file extension cases, calculate 1051 * unaligned buffer size. 1052 */ 1053 NFSLOCKNODE(np); 1054 if ((np->n_flag & NHASBEENLOCKED) == 0 && 1055 (nmp->nm_flag & NFSMNT_NONCONTIGWR) != 0) 1056 noncontig_write = 1; 1057 else 1058 noncontig_write = 0; 1059 if ((uio->uio_offset == np->n_size || 1060 (noncontig_write != 0 && 1061 lbn == (np->n_size / biosize) && 1062 uio->uio_offset + n > np->n_size)) && n) { 1063 NFSUNLOCKNODE(np); 1064 /* 1065 * Get the buffer (in its pre-append state to maintain 1066 * B_CACHE if it was previously set). Resize the 1067 * nfsnode after we have locked the buffer to prevent 1068 * readers from reading garbage. 1069 */ 1070 obcount = np->n_size - (lbn * biosize); 1071 bp = nfs_getcacheblk(vp, lbn, obcount, td); 1072 1073 if (bp != NULL) { 1074 long save; 1075 1076 NFSLOCKNODE(np); 1077 np->n_size = uio->uio_offset + n; 1078 np->n_flag |= NMODIFIED; 1079 np->n_flag &= ~NVNSETSZSKIP; 1080 vnode_pager_setsize(vp, np->n_size); 1081 NFSUNLOCKNODE(np); 1082 1083 save = bp->b_flags & B_CACHE; 1084 bcount = on + n; 1085 allocbuf(bp, bcount); 1086 bp->b_flags |= save; 1087 if (noncontig_write != 0 && on > obcount) 1088 vfs_bio_bzero_buf(bp, obcount, on - 1089 obcount); 1090 } 1091 } else { 1092 /* 1093 * Obtain the locked cache block first, and then 1094 * adjust the file's size as appropriate. 1095 */ 1096 bcount = on + n; 1097 if ((off_t)lbn * biosize + bcount < np->n_size) { 1098 if ((off_t)(lbn + 1) * biosize < np->n_size) 1099 bcount = biosize; 1100 else 1101 bcount = np->n_size - (off_t)lbn * biosize; 1102 } 1103 NFSUNLOCKNODE(np); 1104 bp = nfs_getcacheblk(vp, lbn, bcount, td); 1105 NFSLOCKNODE(np); 1106 if (uio->uio_offset + n > np->n_size) { 1107 np->n_size = uio->uio_offset + n; 1108 np->n_flag |= NMODIFIED; 1109 np->n_flag &= ~NVNSETSZSKIP; 1110 vnode_pager_setsize(vp, np->n_size); 1111 } 1112 NFSUNLOCKNODE(np); 1113 } 1114 1115 if (!bp) { 1116 error = newnfs_sigintr(nmp, td); 1117 if (!error) 1118 error = EINTR; 1119 break; 1120 } 1121 1122 /* 1123 * Issue a READ if B_CACHE is not set. In special-append 1124 * mode, B_CACHE is based on the buffer prior to the write 1125 * op and is typically set, avoiding the read. If a read 1126 * is required in special append mode, the server will 1127 * probably send us a short-read since we extended the file 1128 * on our end, resulting in b_resid == 0 and, thusly, 1129 * B_CACHE getting set. 1130 * 1131 * We can also avoid issuing the read if the write covers 1132 * the entire buffer. We have to make sure the buffer state 1133 * is reasonable in this case since we will not be initiating 1134 * I/O. See the comments in kern/vfs_bio.c's getblk() for 1135 * more information. 1136 * 1137 * B_CACHE may also be set due to the buffer being cached 1138 * normally. 1139 */ 1140 1141 bp_cached = 1; 1142 if (on == 0 && n == bcount) { 1143 if ((bp->b_flags & B_CACHE) == 0) 1144 bp_cached = 0; 1145 bp->b_flags |= B_CACHE; 1146 bp->b_flags &= ~B_INVAL; 1147 bp->b_ioflags &= ~BIO_ERROR; 1148 } 1149 1150 if ((bp->b_flags & B_CACHE) == 0) { 1151 bp->b_iocmd = BIO_READ; 1152 vfs_busy_pages(bp, 0); 1153 error = ncl_doio(vp, bp, cred, td, 0); 1154 if (error) { 1155 brelse(bp); 1156 break; 1157 } 1158 } 1159 if (bp->b_wcred == NOCRED) 1160 bp->b_wcred = crhold(cred); 1161 NFSLOCKNODE(np); 1162 np->n_flag |= NMODIFIED; 1163 NFSUNLOCKNODE(np); 1164 1165 /* 1166 * If dirtyend exceeds file size, chop it down. This should 1167 * not normally occur but there is an append race where it 1168 * might occur XXX, so we log it. 1169 * 1170 * If the chopping creates a reverse-indexed or degenerate 1171 * situation with dirtyoff/end, we 0 both of them. 1172 */ 1173 1174 if (bp->b_dirtyend > bcount) { 1175 printf("NFS append race @%lx:%d\n", 1176 (long)bp->b_blkno * DEV_BSIZE, 1177 bp->b_dirtyend - bcount); 1178 bp->b_dirtyend = bcount; 1179 } 1180 1181 if (bp->b_dirtyoff >= bp->b_dirtyend) 1182 bp->b_dirtyoff = bp->b_dirtyend = 0; 1183 1184 /* 1185 * If the new write will leave a contiguous dirty 1186 * area, just update the b_dirtyoff and b_dirtyend, 1187 * otherwise force a write rpc of the old dirty area. 1188 * 1189 * If there has been a file lock applied to this file 1190 * or vfs.nfs.old_noncontig_writing is set, do the following: 1191 * While it is possible to merge discontiguous writes due to 1192 * our having a B_CACHE buffer ( and thus valid read data 1193 * for the hole), we don't because it could lead to 1194 * significant cache coherency problems with multiple clients, 1195 * especially if locking is implemented later on. 1196 * 1197 * If vfs.nfs.old_noncontig_writing is not set and there has 1198 * not been file locking done on this file: 1199 * Relax coherency a bit for the sake of performance and 1200 * expand the current dirty region to contain the new 1201 * write even if it means we mark some non-dirty data as 1202 * dirty. 1203 */ 1204 1205 if (noncontig_write == 0 && bp->b_dirtyend > 0 && 1206 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) { 1207 if (bwrite(bp) == EINTR) { 1208 error = EINTR; 1209 break; 1210 } 1211 goto again; 1212 } 1213 1214 local_resid = uio->uio_resid; 1215 error = vn_io_fault_uiomove((char *)bp->b_data + on, n, uio); 1216 1217 if (error != 0 && !bp_cached) { 1218 /* 1219 * This block has no other content then what 1220 * possibly was written by the faulty uiomove. 1221 * Release it, forgetting the data pages, to 1222 * prevent the leak of uninitialized data to 1223 * usermode. 1224 */ 1225 bp->b_ioflags |= BIO_ERROR; 1226 brelse(bp); 1227 uio->uio_offset -= local_resid - uio->uio_resid; 1228 uio->uio_resid = local_resid; 1229 break; 1230 } 1231 1232 /* 1233 * Since this block is being modified, it must be written 1234 * again and not just committed. Since write clustering does 1235 * not work for the stage 1 data write, only the stage 2 1236 * commit rpc, we have to clear B_CLUSTEROK as well. 1237 */ 1238 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 1239 1240 /* 1241 * Get the partial update on the progress made from 1242 * uiomove, if an error occurred. 1243 */ 1244 if (error != 0) 1245 n = local_resid - uio->uio_resid; 1246 1247 /* 1248 * Only update dirtyoff/dirtyend if not a degenerate 1249 * condition. 1250 */ 1251 if (n > 0) { 1252 if (bp->b_dirtyend > 0) { 1253 bp->b_dirtyoff = min(on, bp->b_dirtyoff); 1254 bp->b_dirtyend = max((on + n), bp->b_dirtyend); 1255 } else { 1256 bp->b_dirtyoff = on; 1257 bp->b_dirtyend = on + n; 1258 } 1259 vfs_bio_set_valid(bp, on, n); 1260 } 1261 1262 /* 1263 * If IO_SYNC do bwrite(). 1264 * 1265 * IO_INVAL appears to be unused. The idea appears to be 1266 * to turn off caching in this case. Very odd. XXX 1267 */ 1268 if ((ioflag & IO_SYNC)) { 1269 if (ioflag & IO_INVAL) 1270 bp->b_flags |= B_NOCACHE; 1271 error1 = bwrite(bp); 1272 if (error1 != 0) { 1273 if (error == 0) 1274 error = error1; 1275 break; 1276 } 1277 } else if ((n + on) == biosize || (ioflag & IO_ASYNC) != 0) { 1278 bp->b_flags |= B_ASYNC; 1279 (void) ncl_writebp(bp, 0, NULL); 1280 } else { 1281 bdwrite(bp); 1282 } 1283 1284 if (error != 0) 1285 break; 1286 } while (uio->uio_resid > 0 && n > 0); 1287 1288 if (error == 0) { 1289 nanouptime(&ts); 1290 NFSLOCKNODE(np); 1291 np->n_localmodtime = ts; 1292 NFSUNLOCKNODE(np); 1293 } else { 1294 if (ioflag & IO_UNIT) { 1295 VATTR_NULL(&vattr); 1296 vattr.va_size = orig_size; 1297 /* IO_SYNC is handled implicitely */ 1298 (void)VOP_SETATTR(vp, &vattr, cred); 1299 uio->uio_offset -= orig_resid - uio->uio_resid; 1300 uio->uio_resid = orig_resid; 1301 } 1302 } 1303 1304 out: 1305 curthread_pflags2_restore(save2); 1306 return (error); 1307 } 1308 1309 /* 1310 * Get an nfs cache block. 1311 * 1312 * Allocate a new one if the block isn't currently in the cache 1313 * and return the block marked busy. If the calling process is 1314 * interrupted by a signal for an interruptible mount point, return 1315 * NULL. 1316 * 1317 * The caller must carefully deal with the possible B_INVAL state of 1318 * the buffer. ncl_doio() clears B_INVAL (and ncl_asyncio() clears it 1319 * indirectly), so synchronous reads can be issued without worrying about 1320 * the B_INVAL state. We have to be a little more careful when dealing 1321 * with writes (see comments in nfs_write()) when extending a file past 1322 * its EOF. 1323 */ 1324 static struct buf * 1325 nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct thread *td) 1326 { 1327 struct buf *bp; 1328 struct mount *mp; 1329 struct nfsmount *nmp; 1330 1331 mp = vp->v_mount; 1332 nmp = VFSTONFS(mp); 1333 1334 if (nmp->nm_flag & NFSMNT_INT) { 1335 sigset_t oldset; 1336 1337 newnfs_set_sigmask(td, &oldset); 1338 bp = getblk(vp, bn, size, PCATCH, 0, 0); 1339 newnfs_restore_sigmask(td, &oldset); 1340 while (bp == NULL) { 1341 if (newnfs_sigintr(nmp, td)) 1342 return (NULL); 1343 bp = getblk(vp, bn, size, 0, 2 * hz, 0); 1344 } 1345 } else { 1346 bp = getblk(vp, bn, size, 0, 0, 0); 1347 } 1348 1349 if (vp->v_type == VREG) 1350 bp->b_blkno = bn * (vp->v_bufobj.bo_bsize / DEV_BSIZE); 1351 return (bp); 1352 } 1353 1354 /* 1355 * Flush and invalidate all dirty buffers. If another process is already 1356 * doing the flush, just wait for completion. 1357 */ 1358 int 1359 ncl_vinvalbuf(struct vnode *vp, int flags, struct thread *td, int intrflg) 1360 { 1361 struct nfsnode *np = VTONFS(vp); 1362 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1363 int error = 0, slpflag, slptimeo; 1364 bool old_lock; 1365 struct timespec ts; 1366 1367 ASSERT_VOP_LOCKED(vp, "ncl_vinvalbuf"); 1368 1369 if ((nmp->nm_flag & NFSMNT_INT) == 0) 1370 intrflg = 0; 1371 if (NFSCL_FORCEDISM(nmp->nm_mountp)) 1372 intrflg = 1; 1373 if (intrflg) { 1374 slpflag = PCATCH; 1375 slptimeo = 2 * hz; 1376 } else { 1377 slpflag = 0; 1378 slptimeo = 0; 1379 } 1380 1381 old_lock = ncl_excl_start(vp); 1382 if (old_lock) 1383 flags |= V_ALLOWCLEAN; 1384 1385 /* 1386 * Now, flush as required. 1387 */ 1388 if ((flags & (V_SAVE | V_VMIO)) == V_SAVE && 1389 vp->v_bufobj.bo_object != NULL) { 1390 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object); 1391 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC); 1392 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object); 1393 /* 1394 * If the page clean was interrupted, fail the invalidation. 1395 * Not doing so, we run the risk of losing dirty pages in the 1396 * vinvalbuf() call below. 1397 */ 1398 if (intrflg && (error = newnfs_sigintr(nmp, td))) 1399 goto out; 1400 } 1401 1402 error = vinvalbuf(vp, flags, slpflag, 0); 1403 while (error) { 1404 if (intrflg && (error = newnfs_sigintr(nmp, td))) 1405 goto out; 1406 error = vinvalbuf(vp, flags, 0, slptimeo); 1407 } 1408 if (NFSHASPNFS(nmp)) { 1409 nfscl_layoutcommit(vp, td); 1410 nanouptime(&ts); 1411 /* 1412 * Invalidate the attribute cache, since writes to a DS 1413 * won't update the size attribute. 1414 */ 1415 NFSLOCKNODE(np); 1416 np->n_attrstamp = 0; 1417 } else { 1418 nanouptime(&ts); 1419 NFSLOCKNODE(np); 1420 } 1421 if (np->n_directio_asyncwr == 0 && (np->n_flag & NMODIFIED) != 0) { 1422 np->n_localmodtime = ts; 1423 np->n_flag &= ~NMODIFIED; 1424 } 1425 NFSUNLOCKNODE(np); 1426 out: 1427 ncl_excl_finish(vp, old_lock); 1428 return error; 1429 } 1430 1431 /* 1432 * Initiate asynchronous I/O. Return an error if no nfsiods are available. 1433 * This is mainly to avoid queueing async I/O requests when the nfsiods 1434 * are all hung on a dead server. 1435 * 1436 * Note: ncl_asyncio() does not clear (BIO_ERROR|B_INVAL) but when the bp 1437 * is eventually dequeued by the async daemon, ncl_doio() *will*. 1438 */ 1439 int 1440 ncl_asyncio(struct nfsmount *nmp, struct buf *bp, struct ucred *cred, struct thread *td) 1441 { 1442 int iod; 1443 int gotiod; 1444 int slpflag = 0; 1445 int slptimeo = 0; 1446 int error, error2; 1447 1448 /* 1449 * Commits are usually short and sweet so lets save some cpu and 1450 * leave the async daemons for more important rpc's (such as reads 1451 * and writes). 1452 * 1453 * Readdirplus RPCs do vget()s to acquire the vnodes for entries 1454 * in the directory in order to update attributes. This can deadlock 1455 * with another thread that is waiting for async I/O to be done by 1456 * an nfsiod thread while holding a lock on one of these vnodes. 1457 * To avoid this deadlock, don't allow the async nfsiod threads to 1458 * perform Readdirplus RPCs. 1459 */ 1460 NFSLOCKIOD(); 1461 if ((bp->b_iocmd == BIO_WRITE && (bp->b_flags & B_NEEDCOMMIT) && 1462 (nmp->nm_bufqiods > ncl_numasync / 2)) || 1463 (bp->b_vp->v_type == VDIR && (nmp->nm_flag & NFSMNT_RDIRPLUS))) { 1464 NFSUNLOCKIOD(); 1465 return(EIO); 1466 } 1467 again: 1468 if (nmp->nm_flag & NFSMNT_INT) 1469 slpflag = PCATCH; 1470 gotiod = FALSE; 1471 1472 /* 1473 * Find a free iod to process this request. 1474 */ 1475 for (iod = 0; iod < ncl_numasync; iod++) 1476 if (ncl_iodwant[iod] == NFSIOD_AVAILABLE) { 1477 gotiod = TRUE; 1478 break; 1479 } 1480 1481 /* 1482 * Try to create one if none are free. 1483 */ 1484 if (!gotiod) 1485 ncl_nfsiodnew(); 1486 else { 1487 /* 1488 * Found one, so wake it up and tell it which 1489 * mount to process. 1490 */ 1491 NFS_DPF(ASYNCIO, ("ncl_asyncio: waking iod %d for mount %p\n", 1492 iod, nmp)); 1493 ncl_iodwant[iod] = NFSIOD_NOT_AVAILABLE; 1494 ncl_iodmount[iod] = nmp; 1495 nmp->nm_bufqiods++; 1496 wakeup(&ncl_iodwant[iod]); 1497 } 1498 1499 /* 1500 * If none are free, we may already have an iod working on this mount 1501 * point. If so, it will process our request. 1502 */ 1503 if (!gotiod) { 1504 if (nmp->nm_bufqiods > 0) { 1505 NFS_DPF(ASYNCIO, 1506 ("ncl_asyncio: %d iods are already processing mount %p\n", 1507 nmp->nm_bufqiods, nmp)); 1508 gotiod = TRUE; 1509 } 1510 } 1511 1512 /* 1513 * If we have an iod which can process the request, then queue 1514 * the buffer. 1515 */ 1516 if (gotiod) { 1517 /* 1518 * Ensure that the queue never grows too large. We still want 1519 * to asynchronize so we block rather then return EIO. 1520 */ 1521 while (nmp->nm_bufqlen >= 2*ncl_numasync) { 1522 NFS_DPF(ASYNCIO, 1523 ("ncl_asyncio: waiting for mount %p queue to drain\n", nmp)); 1524 nmp->nm_bufqwant = TRUE; 1525 error = newnfs_msleep(td, &nmp->nm_bufq, 1526 &ncl_iod_mutex, slpflag | PRIBIO, "nfsaio", 1527 slptimeo); 1528 if (error) { 1529 error2 = newnfs_sigintr(nmp, td); 1530 if (error2) { 1531 NFSUNLOCKIOD(); 1532 return (error2); 1533 } 1534 if (slpflag == PCATCH) { 1535 slpflag = 0; 1536 slptimeo = 2 * hz; 1537 } 1538 } 1539 /* 1540 * We might have lost our iod while sleeping, 1541 * so check and loop if necessary. 1542 */ 1543 goto again; 1544 } 1545 1546 /* We might have lost our nfsiod */ 1547 if (nmp->nm_bufqiods == 0) { 1548 NFS_DPF(ASYNCIO, 1549 ("ncl_asyncio: no iods after mount %p queue was drained, looping\n", nmp)); 1550 goto again; 1551 } 1552 1553 if (bp->b_iocmd == BIO_READ) { 1554 if (bp->b_rcred == NOCRED && cred != NOCRED) 1555 bp->b_rcred = crhold(cred); 1556 } else { 1557 if (bp->b_wcred == NOCRED && cred != NOCRED) 1558 bp->b_wcred = crhold(cred); 1559 } 1560 1561 if (bp->b_flags & B_REMFREE) 1562 bremfreef(bp); 1563 BUF_KERNPROC(bp); 1564 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist); 1565 nmp->nm_bufqlen++; 1566 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) { 1567 NFSLOCKNODE(VTONFS(bp->b_vp)); 1568 VTONFS(bp->b_vp)->n_flag |= NMODIFIED; 1569 VTONFS(bp->b_vp)->n_directio_asyncwr++; 1570 NFSUNLOCKNODE(VTONFS(bp->b_vp)); 1571 } 1572 NFSUNLOCKIOD(); 1573 return (0); 1574 } 1575 1576 NFSUNLOCKIOD(); 1577 1578 /* 1579 * All the iods are busy on other mounts, so return EIO to 1580 * force the caller to process the i/o synchronously. 1581 */ 1582 NFS_DPF(ASYNCIO, ("ncl_asyncio: no iods available, i/o is synchronous\n")); 1583 return (EIO); 1584 } 1585 1586 void 1587 ncl_doio_directwrite(struct buf *bp) 1588 { 1589 int iomode, must_commit; 1590 struct uio *uiop = (struct uio *)bp->b_caller1; 1591 char *iov_base = uiop->uio_iov->iov_base; 1592 1593 iomode = NFSWRITE_FILESYNC; 1594 uiop->uio_td = NULL; /* NULL since we're in nfsiod */ 1595 ncl_writerpc(bp->b_vp, uiop, bp->b_wcred, &iomode, &must_commit, 0); 1596 KASSERT((must_commit == 0), ("ncl_doio_directwrite: Did not commit write")); 1597 free(iov_base, M_NFSDIRECTIO); 1598 free(uiop->uio_iov, M_NFSDIRECTIO); 1599 free(uiop, M_NFSDIRECTIO); 1600 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) { 1601 struct nfsnode *np = VTONFS(bp->b_vp); 1602 NFSLOCKNODE(np); 1603 if (NFSHASPNFS(VFSTONFS(bp->b_vp->v_mount))) { 1604 /* 1605 * Invalidate the attribute cache, since writes to a DS 1606 * won't update the size attribute. 1607 */ 1608 np->n_attrstamp = 0; 1609 } 1610 np->n_directio_asyncwr--; 1611 if (np->n_directio_asyncwr == 0) { 1612 np->n_flag &= ~NMODIFIED; 1613 if ((np->n_flag & NFSYNCWAIT)) { 1614 np->n_flag &= ~NFSYNCWAIT; 1615 wakeup((caddr_t)&np->n_directio_asyncwr); 1616 } 1617 } 1618 NFSUNLOCKNODE(np); 1619 } 1620 bp->b_vp = NULL; 1621 uma_zfree(ncl_pbuf_zone, bp); 1622 } 1623 1624 /* 1625 * Do an I/O operation to/from a cache block. This may be called 1626 * synchronously or from an nfsiod. 1627 */ 1628 int 1629 ncl_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td, 1630 int called_from_strategy) 1631 { 1632 struct uio *uiop; 1633 struct nfsnode *np; 1634 struct nfsmount *nmp; 1635 int error = 0, iomode, must_commit = 0; 1636 struct uio uio; 1637 struct iovec io; 1638 struct proc *p = td ? td->td_proc : NULL; 1639 uint8_t iocmd; 1640 1641 np = VTONFS(vp); 1642 nmp = VFSTONFS(vp->v_mount); 1643 uiop = &uio; 1644 uiop->uio_iov = &io; 1645 uiop->uio_iovcnt = 1; 1646 uiop->uio_segflg = UIO_SYSSPACE; 1647 uiop->uio_td = td; 1648 1649 /* 1650 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We 1651 * do this here so we do not have to do it in all the code that 1652 * calls us. 1653 */ 1654 bp->b_flags &= ~B_INVAL; 1655 bp->b_ioflags &= ~BIO_ERROR; 1656 1657 KASSERT(!(bp->b_flags & B_DONE), ("ncl_doio: bp %p already marked done", bp)); 1658 iocmd = bp->b_iocmd; 1659 if (iocmd == BIO_READ) { 1660 io.iov_len = uiop->uio_resid = bp->b_bcount; 1661 io.iov_base = bp->b_data; 1662 uiop->uio_rw = UIO_READ; 1663 1664 switch (vp->v_type) { 1665 case VREG: 1666 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE; 1667 NFSINCRGLOBAL(nfsstatsv1.read_bios); 1668 error = ncl_readrpc(vp, uiop, cr); 1669 1670 if (!error) { 1671 if (uiop->uio_resid) { 1672 /* 1673 * If we had a short read with no error, we must have 1674 * hit a file hole. We should zero-fill the remainder. 1675 * This can also occur if the server hits the file EOF. 1676 * 1677 * Holes used to be able to occur due to pending 1678 * writes, but that is not possible any longer. 1679 */ 1680 int nread = bp->b_bcount - uiop->uio_resid; 1681 ssize_t left = uiop->uio_resid; 1682 1683 if (left > 0) 1684 bzero((char *)bp->b_data + nread, left); 1685 uiop->uio_resid = 0; 1686 } 1687 } 1688 /* ASSERT_VOP_LOCKED(vp, "ncl_doio"); */ 1689 if (p && vp->v_writecount <= -1) { 1690 NFSLOCKNODE(np); 1691 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &np->n_vattr.na_mtime)) { 1692 NFSUNLOCKNODE(np); 1693 PROC_LOCK(p); 1694 killproc(p, "text file modification"); 1695 PROC_UNLOCK(p); 1696 } else 1697 NFSUNLOCKNODE(np); 1698 } 1699 break; 1700 case VLNK: 1701 uiop->uio_offset = (off_t)0; 1702 NFSINCRGLOBAL(nfsstatsv1.readlink_bios); 1703 error = ncl_readlinkrpc(vp, uiop, cr); 1704 break; 1705 case VDIR: 1706 NFSINCRGLOBAL(nfsstatsv1.readdir_bios); 1707 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ; 1708 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) != 0) { 1709 error = ncl_readdirplusrpc(vp, uiop, cr, td); 1710 if (error == NFSERR_NOTSUPP) 1711 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 1712 } 1713 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0) 1714 error = ncl_readdirrpc(vp, uiop, cr, td); 1715 /* 1716 * end-of-directory sets B_INVAL but does not generate an 1717 * error. 1718 */ 1719 if (error == 0 && uiop->uio_resid == bp->b_bcount) 1720 bp->b_flags |= B_INVAL; 1721 break; 1722 default: 1723 printf("ncl_doio: type %x unexpected\n", vp->v_type); 1724 break; 1725 } 1726 if (error) { 1727 bp->b_ioflags |= BIO_ERROR; 1728 bp->b_error = error; 1729 } 1730 } else { 1731 /* 1732 * If we only need to commit, try to commit 1733 */ 1734 if (bp->b_flags & B_NEEDCOMMIT) { 1735 int retv; 1736 off_t off; 1737 1738 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 1739 retv = ncl_commit(vp, off, bp->b_dirtyend-bp->b_dirtyoff, 1740 bp->b_wcred, td); 1741 if (NFSCL_FORCEDISM(vp->v_mount) || retv == 0) { 1742 bp->b_dirtyoff = bp->b_dirtyend = 0; 1743 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 1744 bp->b_resid = 0; 1745 bufdone(bp); 1746 return (0); 1747 } 1748 if (retv == NFSERR_STALEWRITEVERF) { 1749 ncl_clearcommit(vp->v_mount); 1750 } 1751 } 1752 1753 /* 1754 * Setup for actual write 1755 */ 1756 NFSLOCKNODE(np); 1757 if ((off_t)bp->b_blkno * DEV_BSIZE + bp->b_dirtyend > np->n_size) 1758 bp->b_dirtyend = np->n_size - (off_t)bp->b_blkno * DEV_BSIZE; 1759 NFSUNLOCKNODE(np); 1760 1761 if (bp->b_dirtyend > bp->b_dirtyoff) { 1762 io.iov_len = uiop->uio_resid = bp->b_dirtyend 1763 - bp->b_dirtyoff; 1764 uiop->uio_offset = (off_t)bp->b_blkno * DEV_BSIZE 1765 + bp->b_dirtyoff; 1766 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 1767 uiop->uio_rw = UIO_WRITE; 1768 NFSINCRGLOBAL(nfsstatsv1.write_bios); 1769 1770 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC) 1771 iomode = NFSWRITE_UNSTABLE; 1772 else 1773 iomode = NFSWRITE_FILESYNC; 1774 1775 error = ncl_writerpc(vp, uiop, cr, &iomode, &must_commit, 1776 called_from_strategy); 1777 1778 /* 1779 * When setting B_NEEDCOMMIT also set B_CLUSTEROK to try 1780 * to cluster the buffers needing commit. This will allow 1781 * the system to submit a single commit rpc for the whole 1782 * cluster. We can do this even if the buffer is not 100% 1783 * dirty (relative to the NFS blocksize), so we optimize the 1784 * append-to-file-case. 1785 * 1786 * (when clearing B_NEEDCOMMIT, B_CLUSTEROK must also be 1787 * cleared because write clustering only works for commit 1788 * rpc's, not for the data portion of the write). 1789 */ 1790 1791 if (!error && iomode == NFSWRITE_UNSTABLE) { 1792 bp->b_flags |= B_NEEDCOMMIT; 1793 if (bp->b_dirtyoff == 0 1794 && bp->b_dirtyend == bp->b_bcount) 1795 bp->b_flags |= B_CLUSTEROK; 1796 } else { 1797 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 1798 } 1799 1800 /* 1801 * For an interrupted write, the buffer is still valid 1802 * and the write hasn't been pushed to the server yet, 1803 * so we can't set BIO_ERROR and report the interruption 1804 * by setting B_EINTR. For the B_ASYNC case, B_EINTR 1805 * is not relevant, so the rpc attempt is essentially 1806 * a noop. For the case of a V3 write rpc not being 1807 * committed to stable storage, the block is still 1808 * dirty and requires either a commit rpc or another 1809 * write rpc with iomode == NFSV3WRITE_FILESYNC before 1810 * the block is reused. This is indicated by setting 1811 * the B_DELWRI and B_NEEDCOMMIT flags. 1812 * 1813 * EIO is returned by ncl_writerpc() to indicate a recoverable 1814 * write error and is handled as above, except that 1815 * B_EINTR isn't set. One cause of this is a stale stateid 1816 * error for the RPC that indicates recovery is required, 1817 * when called with called_from_strategy != 0. 1818 * 1819 * If the buffer is marked B_PAGING, it does not reside on 1820 * the vp's paging queues so we cannot call bdirty(). The 1821 * bp in this case is not an NFS cache block so we should 1822 * be safe. XXX 1823 * 1824 * The logic below breaks up errors into recoverable and 1825 * unrecoverable. For the former, we clear B_INVAL|B_NOCACHE 1826 * and keep the buffer around for potential write retries. 1827 * For the latter (eg ESTALE), we toss the buffer away (B_INVAL) 1828 * and save the error in the nfsnode. This is less than ideal 1829 * but necessary. Keeping such buffers around could potentially 1830 * cause buffer exhaustion eventually (they can never be written 1831 * out, so will get constantly be re-dirtied). It also causes 1832 * all sorts of vfs panics. For non-recoverable write errors, 1833 * also invalidate the attrcache, so we'll be forced to go over 1834 * the wire for this object, returning an error to user on next 1835 * call (most of the time). 1836 */ 1837 if (error == EINTR || error == EIO || error == ETIMEDOUT 1838 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 1839 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 1840 if ((bp->b_flags & B_PAGING) == 0) { 1841 bdirty(bp); 1842 bp->b_flags &= ~B_DONE; 1843 } 1844 if ((error == EINTR || error == ETIMEDOUT) && 1845 (bp->b_flags & B_ASYNC) == 0) 1846 bp->b_flags |= B_EINTR; 1847 } else { 1848 if (error) { 1849 bp->b_ioflags |= BIO_ERROR; 1850 bp->b_flags |= B_INVAL; 1851 bp->b_error = np->n_error = error; 1852 NFSLOCKNODE(np); 1853 np->n_flag |= NWRITEERR; 1854 np->n_attrstamp = 0; 1855 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); 1856 NFSUNLOCKNODE(np); 1857 } 1858 bp->b_dirtyoff = bp->b_dirtyend = 0; 1859 } 1860 } else { 1861 bp->b_resid = 0; 1862 bufdone(bp); 1863 return (0); 1864 } 1865 } 1866 bp->b_resid = uiop->uio_resid; 1867 if (must_commit) 1868 ncl_clearcommit(vp->v_mount); 1869 bufdone(bp); 1870 return (error); 1871 } 1872 1873 /* 1874 * Used to aid in handling ftruncate() operations on the NFS client side. 1875 * Truncation creates a number of special problems for NFS. We have to 1876 * throw away VM pages and buffer cache buffers that are beyond EOF, and 1877 * we have to properly handle VM pages or (potentially dirty) buffers 1878 * that straddle the truncation point. 1879 */ 1880 1881 int 1882 ncl_meta_setsize(struct vnode *vp, struct thread *td, u_quad_t nsize) 1883 { 1884 struct nfsnode *np = VTONFS(vp); 1885 u_quad_t tsize; 1886 int biosize = vp->v_bufobj.bo_bsize; 1887 int error = 0; 1888 1889 NFSLOCKNODE(np); 1890 tsize = np->n_size; 1891 np->n_size = nsize; 1892 NFSUNLOCKNODE(np); 1893 1894 if (nsize < tsize) { 1895 struct buf *bp; 1896 daddr_t lbn; 1897 int bufsize; 1898 1899 /* 1900 * vtruncbuf() doesn't get the buffer overlapping the 1901 * truncation point. We may have a B_DELWRI and/or B_CACHE 1902 * buffer that now needs to be truncated. 1903 */ 1904 error = vtruncbuf(vp, nsize, biosize); 1905 lbn = nsize / biosize; 1906 bufsize = nsize - (lbn * biosize); 1907 bp = nfs_getcacheblk(vp, lbn, bufsize, td); 1908 if (!bp) 1909 return EINTR; 1910 if (bp->b_dirtyoff > bp->b_bcount) 1911 bp->b_dirtyoff = bp->b_bcount; 1912 if (bp->b_dirtyend > bp->b_bcount) 1913 bp->b_dirtyend = bp->b_bcount; 1914 bp->b_flags |= B_RELBUF; /* don't leave garbage around */ 1915 brelse(bp); 1916 } else { 1917 vnode_pager_setsize(vp, nsize); 1918 } 1919 return(error); 1920 }
Cache object: 924a3f53ed26ed7b23748a46a8122d09
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