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sys/fs/nfsclient/nfs_clbio.c
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1 /*- 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)nfs_bio.c 8.9 (Berkeley) 3/30/95 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bio.h> 41 #include <sys/buf.h> 42 #include <sys/kernel.h> 43 #include <sys/mount.h> 44 #include <sys/vmmeter.h> 45 #include <sys/vnode.h> 46 47 #include <vm/vm.h> 48 #include <vm/vm_extern.h> 49 #include <vm/vm_page.h> 50 #include <vm/vm_object.h> 51 #include <vm/vm_pager.h> 52 #include <vm/vnode_pager.h> 53 54 #include <fs/nfs/nfsport.h> 55 #include <fs/nfsclient/nfsmount.h> 56 #include <fs/nfsclient/nfs.h> 57 #include <fs/nfsclient/nfsnode.h> 58 59 extern int newnfs_directio_allow_mmap; 60 extern struct nfsstats newnfsstats; 61 extern struct mtx ncl_iod_mutex; 62 extern int ncl_numasync; 63 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON]; 64 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON]; 65 extern int newnfs_directio_enable; 66 extern int newnfs_keep_dirty_on_error; 67 68 int ncl_pbuf_freecnt = -1; /* start out unlimited */ 69 70 static struct buf *nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, 71 struct thread *td); 72 static int nfs_directio_write(struct vnode *vp, struct uio *uiop, 73 struct ucred *cred, int ioflag); 74 75 /* 76 * Vnode op for VM getpages. 77 */ 78 int 79 ncl_getpages(struct vop_getpages_args *ap) 80 { 81 int i, error, nextoff, size, toff, count, npages; 82 struct uio uio; 83 struct iovec iov; 84 vm_offset_t kva; 85 struct buf *bp; 86 struct vnode *vp; 87 struct thread *td; 88 struct ucred *cred; 89 struct nfsmount *nmp; 90 vm_object_t object; 91 vm_page_t *pages; 92 struct nfsnode *np; 93 94 vp = ap->a_vp; 95 np = VTONFS(vp); 96 td = curthread; /* XXX */ 97 cred = curthread->td_ucred; /* XXX */ 98 nmp = VFSTONFS(vp->v_mount); 99 pages = ap->a_m; 100 count = ap->a_count; 101 102 if ((object = vp->v_object) == NULL) { 103 ncl_printf("nfs_getpages: called with non-merged cache vnode??\n"); 104 return (VM_PAGER_ERROR); 105 } 106 107 if (newnfs_directio_enable && !newnfs_directio_allow_mmap) { 108 mtx_lock(&np->n_mtx); 109 if ((np->n_flag & NNONCACHE) && (vp->v_type == VREG)) { 110 mtx_unlock(&np->n_mtx); 111 ncl_printf("nfs_getpages: called on non-cacheable vnode??\n"); 112 return (VM_PAGER_ERROR); 113 } else 114 mtx_unlock(&np->n_mtx); 115 } 116 117 mtx_lock(&nmp->nm_mtx); 118 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 && 119 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 120 mtx_unlock(&nmp->nm_mtx); 121 /* We'll never get here for v4, because we always have fsinfo */ 122 (void)ncl_fsinfo(nmp, vp, cred, td); 123 } else 124 mtx_unlock(&nmp->nm_mtx); 125 126 npages = btoc(count); 127 128 /* 129 * If the requested page is partially valid, just return it and 130 * allow the pager to zero-out the blanks. Partially valid pages 131 * can only occur at the file EOF. 132 */ 133 VM_OBJECT_LOCK(object); 134 if (pages[ap->a_reqpage]->valid != 0) { 135 vm_page_lock_queues(); 136 for (i = 0; i < npages; ++i) { 137 if (i != ap->a_reqpage) 138 vm_page_free(pages[i]); 139 } 140 vm_page_unlock_queues(); 141 VM_OBJECT_UNLOCK(object); 142 return (0); 143 } 144 VM_OBJECT_UNLOCK(object); 145 146 /* 147 * We use only the kva address for the buffer, but this is extremely 148 * convienient and fast. 149 */ 150 bp = getpbuf(&ncl_pbuf_freecnt); 151 152 kva = (vm_offset_t) bp->b_data; 153 pmap_qenter(kva, pages, npages); 154 PCPU_INC(cnt.v_vnodein); 155 PCPU_ADD(cnt.v_vnodepgsin, npages); 156 157 iov.iov_base = (caddr_t) kva; 158 iov.iov_len = count; 159 uio.uio_iov = &iov; 160 uio.uio_iovcnt = 1; 161 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex); 162 uio.uio_resid = count; 163 uio.uio_segflg = UIO_SYSSPACE; 164 uio.uio_rw = UIO_READ; 165 uio.uio_td = td; 166 167 error = ncl_readrpc(vp, &uio, cred); 168 pmap_qremove(kva, npages); 169 170 relpbuf(bp, &ncl_pbuf_freecnt); 171 172 if (error && (uio.uio_resid == count)) { 173 ncl_printf("nfs_getpages: error %d\n", error); 174 VM_OBJECT_LOCK(object); 175 vm_page_lock_queues(); 176 for (i = 0; i < npages; ++i) { 177 if (i != ap->a_reqpage) 178 vm_page_free(pages[i]); 179 } 180 vm_page_unlock_queues(); 181 VM_OBJECT_UNLOCK(object); 182 return (VM_PAGER_ERROR); 183 } 184 185 /* 186 * Calculate the number of bytes read and validate only that number 187 * of bytes. Note that due to pending writes, size may be 0. This 188 * does not mean that the remaining data is invalid! 189 */ 190 191 size = count - uio.uio_resid; 192 VM_OBJECT_LOCK(object); 193 vm_page_lock_queues(); 194 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) { 195 vm_page_t m; 196 nextoff = toff + PAGE_SIZE; 197 m = pages[i]; 198 199 if (nextoff <= size) { 200 /* 201 * Read operation filled an entire page 202 */ 203 m->valid = VM_PAGE_BITS_ALL; 204 KASSERT(m->dirty == 0, 205 ("nfs_getpages: page %p is dirty", m)); 206 } else if (size > toff) { 207 /* 208 * Read operation filled a partial page. 209 */ 210 m->valid = 0; 211 vm_page_set_valid(m, 0, size - toff); 212 KASSERT(m->dirty == 0, 213 ("nfs_getpages: page %p is dirty", m)); 214 } else { 215 /* 216 * Read operation was short. If no error occured 217 * we may have hit a zero-fill section. We simply 218 * leave valid set to 0. 219 */ 220 ; 221 } 222 if (i != ap->a_reqpage) { 223 /* 224 * Whether or not to leave the page activated is up in 225 * the air, but we should put the page on a page queue 226 * somewhere (it already is in the object). Result: 227 * It appears that emperical results show that 228 * deactivating pages is best. 229 */ 230 231 /* 232 * Just in case someone was asking for this page we 233 * now tell them that it is ok to use. 234 */ 235 if (!error) { 236 if (m->oflags & VPO_WANTED) 237 vm_page_activate(m); 238 else 239 vm_page_deactivate(m); 240 vm_page_wakeup(m); 241 } else { 242 vm_page_free(m); 243 } 244 } 245 } 246 vm_page_unlock_queues(); 247 VM_OBJECT_UNLOCK(object); 248 return (0); 249 } 250 251 /* 252 * Vnode op for VM putpages. 253 */ 254 int 255 ncl_putpages(struct vop_putpages_args *ap) 256 { 257 struct uio uio; 258 struct iovec iov; 259 vm_offset_t kva; 260 struct buf *bp; 261 int iomode, must_commit, i, error, npages, count; 262 off_t offset; 263 int *rtvals; 264 struct vnode *vp; 265 struct thread *td; 266 struct ucred *cred; 267 struct nfsmount *nmp; 268 struct nfsnode *np; 269 vm_page_t *pages; 270 271 vp = ap->a_vp; 272 np = VTONFS(vp); 273 td = curthread; /* XXX */ 274 /* Set the cred to n_writecred for the write rpcs. */ 275 if (np->n_writecred != NULL) 276 cred = crhold(np->n_writecred); 277 else 278 cred = crhold(curthread->td_ucred); /* XXX */ 279 nmp = VFSTONFS(vp->v_mount); 280 pages = ap->a_m; 281 count = ap->a_count; 282 rtvals = ap->a_rtvals; 283 npages = btoc(count); 284 offset = IDX_TO_OFF(pages[0]->pindex); 285 286 mtx_lock(&nmp->nm_mtx); 287 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 && 288 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 289 mtx_unlock(&nmp->nm_mtx); 290 (void)ncl_fsinfo(nmp, vp, cred, td); 291 } else 292 mtx_unlock(&nmp->nm_mtx); 293 294 mtx_lock(&np->n_mtx); 295 if (newnfs_directio_enable && !newnfs_directio_allow_mmap && 296 (np->n_flag & NNONCACHE) && (vp->v_type == VREG)) { 297 mtx_unlock(&np->n_mtx); 298 ncl_printf("ncl_putpages: called on noncache-able vnode??\n"); 299 mtx_lock(&np->n_mtx); 300 } 301 302 for (i = 0; i < npages; i++) 303 rtvals[i] = VM_PAGER_ERROR; 304 305 /* 306 * When putting pages, do not extend file past EOF. 307 */ 308 if (offset + count > np->n_size) { 309 count = np->n_size - offset; 310 if (count < 0) 311 count = 0; 312 } 313 mtx_unlock(&np->n_mtx); 314 315 /* 316 * We use only the kva address for the buffer, but this is extremely 317 * convienient and fast. 318 */ 319 bp = getpbuf(&ncl_pbuf_freecnt); 320 321 kva = (vm_offset_t) bp->b_data; 322 pmap_qenter(kva, pages, npages); 323 PCPU_INC(cnt.v_vnodeout); 324 PCPU_ADD(cnt.v_vnodepgsout, count); 325 326 iov.iov_base = (caddr_t) kva; 327 iov.iov_len = count; 328 uio.uio_iov = &iov; 329 uio.uio_iovcnt = 1; 330 uio.uio_offset = offset; 331 uio.uio_resid = count; 332 uio.uio_segflg = UIO_SYSSPACE; 333 uio.uio_rw = UIO_WRITE; 334 uio.uio_td = td; 335 336 if ((ap->a_sync & VM_PAGER_PUT_SYNC) == 0) 337 iomode = NFSWRITE_UNSTABLE; 338 else 339 iomode = NFSWRITE_FILESYNC; 340 341 error = ncl_writerpc(vp, &uio, cred, &iomode, &must_commit, 0); 342 crfree(cred); 343 344 pmap_qremove(kva, npages); 345 relpbuf(bp, &ncl_pbuf_freecnt); 346 347 if (error == 0 || !newnfs_keep_dirty_on_error) { 348 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid); 349 if (must_commit) 350 ncl_clearcommit(vp->v_mount); 351 } 352 return rtvals[0]; 353 } 354 355 /* 356 * For nfs, cache consistency can only be maintained approximately. 357 * Although RFC1094 does not specify the criteria, the following is 358 * believed to be compatible with the reference port. 359 * For nfs: 360 * If the file's modify time on the server has changed since the 361 * last read rpc or you have written to the file, 362 * you may have lost data cache consistency with the 363 * server, so flush all of the file's data out of the cache. 364 * Then force a getattr rpc to ensure that you have up to date 365 * attributes. 366 * NB: This implies that cache data can be read when up to 367 * NFS_ATTRTIMEO seconds out of date. If you find that you need current 368 * attributes this could be forced by setting n_attrstamp to 0 before 369 * the VOP_GETATTR() call. 370 */ 371 static inline int 372 nfs_bioread_check_cons(struct vnode *vp, struct thread *td, struct ucred *cred) 373 { 374 int error = 0; 375 struct vattr vattr; 376 struct nfsnode *np = VTONFS(vp); 377 int old_lock; 378 379 /* 380 * Grab the exclusive lock before checking whether the cache is 381 * consistent. 382 * XXX - We can make this cheaper later (by acquiring cheaper locks). 383 * But for now, this suffices. 384 */ 385 old_lock = ncl_upgrade_vnlock(vp); 386 if (vp->v_iflag & VI_DOOMED) { 387 ncl_downgrade_vnlock(vp, old_lock); 388 return (EBADF); 389 } 390 391 mtx_lock(&np->n_mtx); 392 if (np->n_flag & NMODIFIED) { 393 mtx_unlock(&np->n_mtx); 394 if (vp->v_type != VREG) { 395 if (vp->v_type != VDIR) 396 panic("nfs: bioread, not dir"); 397 ncl_invaldir(vp); 398 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 399 if (error) 400 goto out; 401 } 402 np->n_attrstamp = 0; 403 error = VOP_GETATTR(vp, &vattr, cred); 404 if (error) 405 goto out; 406 mtx_lock(&np->n_mtx); 407 np->n_mtime = vattr.va_mtime; 408 mtx_unlock(&np->n_mtx); 409 } else { 410 mtx_unlock(&np->n_mtx); 411 error = VOP_GETATTR(vp, &vattr, cred); 412 if (error) 413 return (error); 414 mtx_lock(&np->n_mtx); 415 if ((np->n_flag & NSIZECHANGED) 416 || (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime))) { 417 mtx_unlock(&np->n_mtx); 418 if (vp->v_type == VDIR) 419 ncl_invaldir(vp); 420 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 421 if (error) 422 goto out; 423 mtx_lock(&np->n_mtx); 424 np->n_mtime = vattr.va_mtime; 425 np->n_flag &= ~NSIZECHANGED; 426 } 427 mtx_unlock(&np->n_mtx); 428 } 429 out: 430 ncl_downgrade_vnlock(vp, old_lock); 431 return error; 432 } 433 434 /* 435 * Vnode op for read using bio 436 */ 437 int 438 ncl_bioread(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred) 439 { 440 struct nfsnode *np = VTONFS(vp); 441 int biosize, i; 442 struct buf *bp, *rabp; 443 struct thread *td; 444 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 445 daddr_t lbn, rabn; 446 int bcount; 447 int seqcount; 448 int nra, error = 0, n = 0, on = 0; 449 off_t tmp_off; 450 451 KASSERT(uio->uio_rw == UIO_READ, ("ncl_read mode")); 452 if (uio->uio_resid == 0) 453 return (0); 454 if (uio->uio_offset < 0) /* XXX VDIR cookies can be negative */ 455 return (EINVAL); 456 td = uio->uio_td; 457 458 mtx_lock(&nmp->nm_mtx); 459 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 && 460 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 461 mtx_unlock(&nmp->nm_mtx); 462 (void)ncl_fsinfo(nmp, vp, cred, td); 463 mtx_lock(&nmp->nm_mtx); 464 } 465 if (nmp->nm_rsize == 0 || nmp->nm_readdirsize == 0) 466 (void) newnfs_iosize(nmp); 467 468 tmp_off = uio->uio_offset + uio->uio_resid; 469 if (vp->v_type != VDIR && 470 (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)) { 471 mtx_unlock(&nmp->nm_mtx); 472 return (EFBIG); 473 } 474 mtx_unlock(&nmp->nm_mtx); 475 476 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && (vp->v_type == VREG)) 477 /* No caching/ no readaheads. Just read data into the user buffer */ 478 return ncl_readrpc(vp, uio, cred); 479 480 biosize = vp->v_bufobj.bo_bsize; 481 seqcount = (int)((off_t)(ioflag >> IO_SEQSHIFT) * biosize / BKVASIZE); 482 483 error = nfs_bioread_check_cons(vp, td, cred); 484 if (error) 485 return error; 486 487 do { 488 u_quad_t nsize; 489 490 mtx_lock(&np->n_mtx); 491 nsize = np->n_size; 492 mtx_unlock(&np->n_mtx); 493 494 switch (vp->v_type) { 495 case VREG: 496 NFSINCRGLOBAL(newnfsstats.biocache_reads); 497 lbn = uio->uio_offset / biosize; 498 on = uio->uio_offset & (biosize - 1); 499 500 /* 501 * Start the read ahead(s), as required. 502 */ 503 if (nmp->nm_readahead > 0) { 504 for (nra = 0; nra < nmp->nm_readahead && nra < seqcount && 505 (off_t)(lbn + 1 + nra) * biosize < nsize; nra++) { 506 rabn = lbn + 1 + nra; 507 if (incore(&vp->v_bufobj, rabn) == NULL) { 508 rabp = nfs_getcacheblk(vp, rabn, biosize, td); 509 if (!rabp) { 510 error = newnfs_sigintr(nmp, td); 511 return (error ? error : EINTR); 512 } 513 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) { 514 rabp->b_flags |= B_ASYNC; 515 rabp->b_iocmd = BIO_READ; 516 vfs_busy_pages(rabp, 0); 517 if (ncl_asyncio(nmp, rabp, cred, td)) { 518 rabp->b_flags |= B_INVAL; 519 rabp->b_ioflags |= BIO_ERROR; 520 vfs_unbusy_pages(rabp); 521 brelse(rabp); 522 break; 523 } 524 } else { 525 brelse(rabp); 526 } 527 } 528 } 529 } 530 531 /* Note that bcount is *not* DEV_BSIZE aligned. */ 532 bcount = biosize; 533 if ((off_t)lbn * biosize >= nsize) { 534 bcount = 0; 535 } else if ((off_t)(lbn + 1) * biosize > nsize) { 536 bcount = nsize - (off_t)lbn * biosize; 537 } 538 bp = nfs_getcacheblk(vp, lbn, bcount, td); 539 540 if (!bp) { 541 error = newnfs_sigintr(nmp, td); 542 return (error ? error : EINTR); 543 } 544 545 /* 546 * If B_CACHE is not set, we must issue the read. If this 547 * fails, we return an error. 548 */ 549 550 if ((bp->b_flags & B_CACHE) == 0) { 551 bp->b_iocmd = BIO_READ; 552 vfs_busy_pages(bp, 0); 553 error = ncl_doio(vp, bp, cred, td, 0); 554 if (error) { 555 brelse(bp); 556 return (error); 557 } 558 } 559 560 /* 561 * on is the offset into the current bp. Figure out how many 562 * bytes we can copy out of the bp. Note that bcount is 563 * NOT DEV_BSIZE aligned. 564 * 565 * Then figure out how many bytes we can copy into the uio. 566 */ 567 568 n = 0; 569 if (on < bcount) 570 n = min((unsigned)(bcount - on), uio->uio_resid); 571 break; 572 case VLNK: 573 NFSINCRGLOBAL(newnfsstats.biocache_readlinks); 574 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, td); 575 if (!bp) { 576 error = newnfs_sigintr(nmp, td); 577 return (error ? error : EINTR); 578 } 579 if ((bp->b_flags & B_CACHE) == 0) { 580 bp->b_iocmd = BIO_READ; 581 vfs_busy_pages(bp, 0); 582 error = ncl_doio(vp, bp, cred, td, 0); 583 if (error) { 584 bp->b_ioflags |= BIO_ERROR; 585 brelse(bp); 586 return (error); 587 } 588 } 589 n = min(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid); 590 on = 0; 591 break; 592 case VDIR: 593 NFSINCRGLOBAL(newnfsstats.biocache_readdirs); 594 if (np->n_direofoffset 595 && uio->uio_offset >= np->n_direofoffset) { 596 return (0); 597 } 598 lbn = (uoff_t)uio->uio_offset / NFS_DIRBLKSIZ; 599 on = uio->uio_offset & (NFS_DIRBLKSIZ - 1); 600 bp = nfs_getcacheblk(vp, lbn, NFS_DIRBLKSIZ, td); 601 if (!bp) { 602 error = newnfs_sigintr(nmp, td); 603 return (error ? error : EINTR); 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 * Yuck! The directory has been modified on the 617 * server. The only way to get the block is by 618 * reading from the beginning to get all the 619 * offset cookies. 620 * 621 * Leave the last bp intact unless there is an error. 622 * Loop back up to the while if the error is another 623 * NFSERR_BAD_COOKIE (double yuch!). 624 */ 625 for (i = 0; i <= lbn && !error; i++) { 626 if (np->n_direofoffset 627 && (i * NFS_DIRBLKSIZ) >= np->n_direofoffset) 628 return (0); 629 bp = nfs_getcacheblk(vp, i, NFS_DIRBLKSIZ, td); 630 if (!bp) { 631 error = newnfs_sigintr(nmp, td); 632 return (error ? error : EINTR); 633 } 634 if ((bp->b_flags & B_CACHE) == 0) { 635 bp->b_iocmd = BIO_READ; 636 vfs_busy_pages(bp, 0); 637 error = ncl_doio(vp, bp, cred, td, 0); 638 /* 639 * no error + B_INVAL == directory EOF, 640 * use the block. 641 */ 642 if (error == 0 && (bp->b_flags & B_INVAL)) 643 break; 644 } 645 /* 646 * An error will throw away the block and the 647 * for loop will break out. If no error and this 648 * is not the block we want, we throw away the 649 * block and go for the next one via the for loop. 650 */ 651 if (error || i < lbn) 652 brelse(bp); 653 } 654 } 655 /* 656 * The above while is repeated if we hit another cookie 657 * error. If we hit an error and it wasn't a cookie error, 658 * we give up. 659 */ 660 if (error) 661 return (error); 662 } 663 664 /* 665 * If not eof and read aheads are enabled, start one. 666 * (You need the current block first, so that you have the 667 * directory offset cookie of the next block.) 668 */ 669 if (nmp->nm_readahead > 0 && 670 (bp->b_flags & B_INVAL) == 0 && 671 (np->n_direofoffset == 0 || 672 (lbn + 1) * NFS_DIRBLKSIZ < np->n_direofoffset) && 673 incore(&vp->v_bufobj, lbn + 1) == NULL) { 674 rabp = nfs_getcacheblk(vp, lbn + 1, NFS_DIRBLKSIZ, td); 675 if (rabp) { 676 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) { 677 rabp->b_flags |= B_ASYNC; 678 rabp->b_iocmd = BIO_READ; 679 vfs_busy_pages(rabp, 0); 680 if (ncl_asyncio(nmp, rabp, cred, td)) { 681 rabp->b_flags |= B_INVAL; 682 rabp->b_ioflags |= BIO_ERROR; 683 vfs_unbusy_pages(rabp); 684 brelse(rabp); 685 } 686 } else { 687 brelse(rabp); 688 } 689 } 690 } 691 /* 692 * Unlike VREG files, whos buffer size ( bp->b_bcount ) is 693 * chopped for the EOF condition, we cannot tell how large 694 * NFS directories are going to be until we hit EOF. So 695 * an NFS directory buffer is *not* chopped to its EOF. Now, 696 * it just so happens that b_resid will effectively chop it 697 * to EOF. *BUT* this information is lost if the buffer goes 698 * away and is reconstituted into a B_CACHE state ( due to 699 * being VMIO ) later. So we keep track of the directory eof 700 * in np->n_direofoffset and chop it off as an extra step 701 * right here. 702 */ 703 n = lmin(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid - on); 704 if (np->n_direofoffset && n > np->n_direofoffset - uio->uio_offset) 705 n = np->n_direofoffset - uio->uio_offset; 706 break; 707 default: 708 ncl_printf(" ncl_bioread: type %x unexpected\n", vp->v_type); 709 bp = NULL; 710 break; 711 }; 712 713 if (n > 0) { 714 error = uiomove(bp->b_data + on, (int)n, uio); 715 } 716 if (vp->v_type == VLNK) 717 n = 0; 718 if (bp != NULL) 719 brelse(bp); 720 } while (error == 0 && uio->uio_resid > 0 && n > 0); 721 return (error); 722 } 723 724 /* 725 * The NFS write path cannot handle iovecs with len > 1. So we need to 726 * break up iovecs accordingly (restricting them to wsize). 727 * For the SYNC case, we can do this with 1 copy (user buffer -> mbuf). 728 * For the ASYNC case, 2 copies are needed. The first a copy from the 729 * user buffer to a staging buffer and then a second copy from the staging 730 * buffer to mbufs. This can be optimized by copying from the user buffer 731 * directly into mbufs and passing the chain down, but that requires a 732 * fair amount of re-working of the relevant codepaths (and can be done 733 * later). 734 */ 735 static int 736 nfs_directio_write(vp, uiop, cred, ioflag) 737 struct vnode *vp; 738 struct uio *uiop; 739 struct ucred *cred; 740 int ioflag; 741 { 742 int error; 743 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 744 struct thread *td = uiop->uio_td; 745 int size; 746 int wsize; 747 748 mtx_lock(&nmp->nm_mtx); 749 wsize = nmp->nm_wsize; 750 mtx_unlock(&nmp->nm_mtx); 751 if (ioflag & IO_SYNC) { 752 int iomode, must_commit; 753 struct uio uio; 754 struct iovec iov; 755 do_sync: 756 while (uiop->uio_resid > 0) { 757 size = min(uiop->uio_resid, wsize); 758 size = min(uiop->uio_iov->iov_len, size); 759 iov.iov_base = uiop->uio_iov->iov_base; 760 iov.iov_len = size; 761 uio.uio_iov = &iov; 762 uio.uio_iovcnt = 1; 763 uio.uio_offset = uiop->uio_offset; 764 uio.uio_resid = size; 765 uio.uio_segflg = UIO_USERSPACE; 766 uio.uio_rw = UIO_WRITE; 767 uio.uio_td = td; 768 iomode = NFSWRITE_FILESYNC; 769 error = ncl_writerpc(vp, &uio, cred, &iomode, 770 &must_commit, 0); 771 KASSERT((must_commit == 0), 772 ("ncl_directio_write: Did not commit write")); 773 if (error) 774 return (error); 775 uiop->uio_offset += size; 776 uiop->uio_resid -= size; 777 if (uiop->uio_iov->iov_len <= size) { 778 uiop->uio_iovcnt--; 779 uiop->uio_iov++; 780 } else { 781 uiop->uio_iov->iov_base = 782 (char *)uiop->uio_iov->iov_base + size; 783 uiop->uio_iov->iov_len -= size; 784 } 785 } 786 } else { 787 struct uio *t_uio; 788 struct iovec *t_iov; 789 struct buf *bp; 790 791 /* 792 * Break up the write into blocksize chunks and hand these 793 * over to nfsiod's for write back. 794 * Unfortunately, this incurs a copy of the data. Since 795 * the user could modify the buffer before the write is 796 * initiated. 797 * 798 * The obvious optimization here is that one of the 2 copies 799 * in the async write path can be eliminated by copying the 800 * data here directly into mbufs and passing the mbuf chain 801 * down. But that will require a fair amount of re-working 802 * of the code and can be done if there's enough interest 803 * in NFS directio access. 804 */ 805 while (uiop->uio_resid > 0) { 806 size = min(uiop->uio_resid, wsize); 807 size = min(uiop->uio_iov->iov_len, size); 808 bp = getpbuf(&ncl_pbuf_freecnt); 809 t_uio = malloc(sizeof(struct uio), M_NFSDIRECTIO, M_WAITOK); 810 t_iov = malloc(sizeof(struct iovec), M_NFSDIRECTIO, M_WAITOK); 811 t_iov->iov_base = malloc(size, M_NFSDIRECTIO, M_WAITOK); 812 t_iov->iov_len = size; 813 t_uio->uio_iov = t_iov; 814 t_uio->uio_iovcnt = 1; 815 t_uio->uio_offset = uiop->uio_offset; 816 t_uio->uio_resid = size; 817 t_uio->uio_segflg = UIO_SYSSPACE; 818 t_uio->uio_rw = UIO_WRITE; 819 t_uio->uio_td = td; 820 KASSERT(uiop->uio_segflg == UIO_USERSPACE || 821 uiop->uio_segflg == UIO_SYSSPACE, 822 ("nfs_directio_write: Bad uio_segflg")); 823 if (uiop->uio_segflg == UIO_USERSPACE) { 824 error = copyin(uiop->uio_iov->iov_base, 825 t_iov->iov_base, size); 826 if (error != 0) 827 goto err_free; 828 } else 829 /* 830 * UIO_SYSSPACE may never happen, but handle 831 * it just in case it does. 832 */ 833 bcopy(uiop->uio_iov->iov_base, t_iov->iov_base, 834 size); 835 bp->b_flags |= B_DIRECT; 836 bp->b_iocmd = BIO_WRITE; 837 if (cred != NOCRED) { 838 crhold(cred); 839 bp->b_wcred = cred; 840 } else 841 bp->b_wcred = NOCRED; 842 bp->b_caller1 = (void *)t_uio; 843 bp->b_vp = vp; 844 error = ncl_asyncio(nmp, bp, NOCRED, td); 845 err_free: 846 if (error) { 847 free(t_iov->iov_base, M_NFSDIRECTIO); 848 free(t_iov, M_NFSDIRECTIO); 849 free(t_uio, M_NFSDIRECTIO); 850 bp->b_vp = NULL; 851 relpbuf(bp, &ncl_pbuf_freecnt); 852 if (error == EINTR) 853 return (error); 854 goto do_sync; 855 } 856 uiop->uio_offset += size; 857 uiop->uio_resid -= size; 858 if (uiop->uio_iov->iov_len <= size) { 859 uiop->uio_iovcnt--; 860 uiop->uio_iov++; 861 } else { 862 uiop->uio_iov->iov_base = 863 (char *)uiop->uio_iov->iov_base + size; 864 uiop->uio_iov->iov_len -= size; 865 } 866 } 867 } 868 return (0); 869 } 870 871 /* 872 * Vnode op for write using bio 873 */ 874 int 875 ncl_write(struct vop_write_args *ap) 876 { 877 int biosize; 878 struct uio *uio = ap->a_uio; 879 struct thread *td = uio->uio_td; 880 struct vnode *vp = ap->a_vp; 881 struct nfsnode *np = VTONFS(vp); 882 struct ucred *cred = ap->a_cred; 883 int ioflag = ap->a_ioflag; 884 struct buf *bp; 885 struct vattr vattr; 886 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 887 daddr_t lbn; 888 int bcount; 889 int n, on, error = 0; 890 off_t tmp_off; 891 892 KASSERT(uio->uio_rw == UIO_WRITE, ("ncl_write mode")); 893 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread, 894 ("ncl_write proc")); 895 if (vp->v_type != VREG) 896 return (EIO); 897 mtx_lock(&np->n_mtx); 898 if (np->n_flag & NWRITEERR) { 899 np->n_flag &= ~NWRITEERR; 900 mtx_unlock(&np->n_mtx); 901 return (np->n_error); 902 } else 903 mtx_unlock(&np->n_mtx); 904 mtx_lock(&nmp->nm_mtx); 905 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 && 906 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) { 907 mtx_unlock(&nmp->nm_mtx); 908 (void)ncl_fsinfo(nmp, vp, cred, td); 909 mtx_lock(&nmp->nm_mtx); 910 } 911 if (nmp->nm_wsize == 0) 912 (void) newnfs_iosize(nmp); 913 mtx_unlock(&nmp->nm_mtx); 914 915 /* 916 * Synchronously flush pending buffers if we are in synchronous 917 * mode or if we are appending. 918 */ 919 if (ioflag & (IO_APPEND | IO_SYNC)) { 920 mtx_lock(&np->n_mtx); 921 if (np->n_flag & NMODIFIED) { 922 mtx_unlock(&np->n_mtx); 923 #ifdef notyet /* Needs matching nonblock semantics elsewhere, too. */ 924 /* 925 * Require non-blocking, synchronous writes to 926 * dirty files to inform the program it needs 927 * to fsync(2) explicitly. 928 */ 929 if (ioflag & IO_NDELAY) 930 return (EAGAIN); 931 #endif 932 flush_and_restart: 933 np->n_attrstamp = 0; 934 error = ncl_vinvalbuf(vp, V_SAVE, td, 1); 935 if (error) 936 return (error); 937 } else 938 mtx_unlock(&np->n_mtx); 939 } 940 941 /* 942 * If IO_APPEND then load uio_offset. We restart here if we cannot 943 * get the append lock. 944 */ 945 if (ioflag & IO_APPEND) { 946 np->n_attrstamp = 0; 947 error = VOP_GETATTR(vp, &vattr, cred); 948 if (error) 949 return (error); 950 mtx_lock(&np->n_mtx); 951 uio->uio_offset = np->n_size; 952 mtx_unlock(&np->n_mtx); 953 } 954 955 if (uio->uio_offset < 0) 956 return (EINVAL); 957 tmp_off = uio->uio_offset + uio->uio_resid; 958 if (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset) 959 return (EFBIG); 960 if (uio->uio_resid == 0) 961 return (0); 962 963 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && vp->v_type == VREG) 964 return nfs_directio_write(vp, uio, cred, ioflag); 965 966 /* 967 * Maybe this should be above the vnode op call, but so long as 968 * file servers have no limits, i don't think it matters 969 */ 970 if (vn_rlimit_fsize(vp, uio, td)) 971 return (EFBIG); 972 973 biosize = vp->v_bufobj.bo_bsize; 974 /* 975 * Find all of this file's B_NEEDCOMMIT buffers. If our writes 976 * would exceed the local maximum per-file write commit size when 977 * combined with those, we must decide whether to flush, 978 * go synchronous, or return error. We don't bother checking 979 * IO_UNIT -- we just make all writes atomic anyway, as there's 980 * no point optimizing for something that really won't ever happen. 981 */ 982 if (!(ioflag & IO_SYNC)) { 983 int nflag; 984 985 mtx_lock(&np->n_mtx); 986 nflag = np->n_flag; 987 mtx_unlock(&np->n_mtx); 988 int needrestart = 0; 989 if (nmp->nm_wcommitsize < uio->uio_resid) { 990 /* 991 * If this request could not possibly be completed 992 * without exceeding the maximum outstanding write 993 * commit size, see if we can convert it into a 994 * synchronous write operation. 995 */ 996 if (ioflag & IO_NDELAY) 997 return (EAGAIN); 998 ioflag |= IO_SYNC; 999 if (nflag & NMODIFIED) 1000 needrestart = 1; 1001 } else if (nflag & NMODIFIED) { 1002 int wouldcommit = 0; 1003 BO_LOCK(&vp->v_bufobj); 1004 if (vp->v_bufobj.bo_dirty.bv_cnt != 0) { 1005 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd, 1006 b_bobufs) { 1007 if (bp->b_flags & B_NEEDCOMMIT) 1008 wouldcommit += bp->b_bcount; 1009 } 1010 } 1011 BO_UNLOCK(&vp->v_bufobj); 1012 /* 1013 * Since we're not operating synchronously and 1014 * bypassing the buffer cache, we are in a commit 1015 * and holding all of these buffers whether 1016 * transmitted or not. If not limited, this 1017 * will lead to the buffer cache deadlocking, 1018 * as no one else can flush our uncommitted buffers. 1019 */ 1020 wouldcommit += uio->uio_resid; 1021 /* 1022 * If we would initially exceed the maximum 1023 * outstanding write commit size, flush and restart. 1024 */ 1025 if (wouldcommit > nmp->nm_wcommitsize) 1026 needrestart = 1; 1027 } 1028 if (needrestart) 1029 goto flush_and_restart; 1030 } 1031 1032 do { 1033 NFSINCRGLOBAL(newnfsstats.biocache_writes); 1034 lbn = uio->uio_offset / biosize; 1035 on = uio->uio_offset & (biosize-1); 1036 n = min((unsigned)(biosize - on), uio->uio_resid); 1037 again: 1038 /* 1039 * Handle direct append and file extension cases, calculate 1040 * unaligned buffer size. 1041 */ 1042 mtx_lock(&np->n_mtx); 1043 if (uio->uio_offset == np->n_size && n) { 1044 mtx_unlock(&np->n_mtx); 1045 /* 1046 * Get the buffer (in its pre-append state to maintain 1047 * B_CACHE if it was previously set). Resize the 1048 * nfsnode after we have locked the buffer to prevent 1049 * readers from reading garbage. 1050 */ 1051 bcount = on; 1052 bp = nfs_getcacheblk(vp, lbn, bcount, td); 1053 1054 if (bp != NULL) { 1055 long save; 1056 1057 mtx_lock(&np->n_mtx); 1058 np->n_size = uio->uio_offset + n; 1059 np->n_flag |= NMODIFIED; 1060 vnode_pager_setsize(vp, np->n_size); 1061 mtx_unlock(&np->n_mtx); 1062 1063 save = bp->b_flags & B_CACHE; 1064 bcount += n; 1065 allocbuf(bp, bcount); 1066 bp->b_flags |= save; 1067 } 1068 } else { 1069 /* 1070 * Obtain the locked cache block first, and then 1071 * adjust the file's size as appropriate. 1072 */ 1073 bcount = on + n; 1074 if ((off_t)lbn * biosize + bcount < np->n_size) { 1075 if ((off_t)(lbn + 1) * biosize < np->n_size) 1076 bcount = biosize; 1077 else 1078 bcount = np->n_size - (off_t)lbn * biosize; 1079 } 1080 mtx_unlock(&np->n_mtx); 1081 bp = nfs_getcacheblk(vp, lbn, bcount, td); 1082 mtx_lock(&np->n_mtx); 1083 if (uio->uio_offset + n > np->n_size) { 1084 np->n_size = uio->uio_offset + n; 1085 np->n_flag |= NMODIFIED; 1086 vnode_pager_setsize(vp, np->n_size); 1087 } 1088 mtx_unlock(&np->n_mtx); 1089 } 1090 1091 if (!bp) { 1092 error = newnfs_sigintr(nmp, td); 1093 if (!error) 1094 error = EINTR; 1095 break; 1096 } 1097 1098 /* 1099 * Issue a READ if B_CACHE is not set. In special-append 1100 * mode, B_CACHE is based on the buffer prior to the write 1101 * op and is typically set, avoiding the read. If a read 1102 * is required in special append mode, the server will 1103 * probably send us a short-read since we extended the file 1104 * on our end, resulting in b_resid == 0 and, thusly, 1105 * B_CACHE getting set. 1106 * 1107 * We can also avoid issuing the read if the write covers 1108 * the entire buffer. We have to make sure the buffer state 1109 * is reasonable in this case since we will not be initiating 1110 * I/O. See the comments in kern/vfs_bio.c's getblk() for 1111 * more information. 1112 * 1113 * B_CACHE may also be set due to the buffer being cached 1114 * normally. 1115 */ 1116 1117 if (on == 0 && n == bcount) { 1118 bp->b_flags |= B_CACHE; 1119 bp->b_flags &= ~B_INVAL; 1120 bp->b_ioflags &= ~BIO_ERROR; 1121 } 1122 1123 if ((bp->b_flags & B_CACHE) == 0) { 1124 bp->b_iocmd = BIO_READ; 1125 vfs_busy_pages(bp, 0); 1126 error = ncl_doio(vp, bp, cred, td, 0); 1127 if (error) { 1128 brelse(bp); 1129 break; 1130 } 1131 } 1132 if (bp->b_wcred == NOCRED) 1133 bp->b_wcred = crhold(cred); 1134 mtx_lock(&np->n_mtx); 1135 np->n_flag |= NMODIFIED; 1136 mtx_unlock(&np->n_mtx); 1137 1138 /* 1139 * If dirtyend exceeds file size, chop it down. This should 1140 * not normally occur but there is an append race where it 1141 * might occur XXX, so we log it. 1142 * 1143 * If the chopping creates a reverse-indexed or degenerate 1144 * situation with dirtyoff/end, we 0 both of them. 1145 */ 1146 1147 if (bp->b_dirtyend > bcount) { 1148 ncl_printf("NFS append race @%lx:%d\n", 1149 (long)bp->b_blkno * DEV_BSIZE, 1150 bp->b_dirtyend - bcount); 1151 bp->b_dirtyend = bcount; 1152 } 1153 1154 if (bp->b_dirtyoff >= bp->b_dirtyend) 1155 bp->b_dirtyoff = bp->b_dirtyend = 0; 1156 1157 /* 1158 * If the new write will leave a contiguous dirty 1159 * area, just update the b_dirtyoff and b_dirtyend, 1160 * otherwise force a write rpc of the old dirty area. 1161 * 1162 * While it is possible to merge discontiguous writes due to 1163 * our having a B_CACHE buffer ( and thus valid read data 1164 * for the hole), we don't because it could lead to 1165 * significant cache coherency problems with multiple clients, 1166 * especially if locking is implemented later on. 1167 * 1168 * As an optimization we could theoretically maintain 1169 * a linked list of discontinuous areas, but we would still 1170 * have to commit them separately so there isn't much 1171 * advantage to it except perhaps a bit of asynchronization. 1172 */ 1173 1174 if (bp->b_dirtyend > 0 && 1175 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) { 1176 if (bwrite(bp) == EINTR) { 1177 error = EINTR; 1178 break; 1179 } 1180 goto again; 1181 } 1182 1183 error = uiomove((char *)bp->b_data + on, n, uio); 1184 1185 /* 1186 * Since this block is being modified, it must be written 1187 * again and not just committed. Since write clustering does 1188 * not work for the stage 1 data write, only the stage 2 1189 * commit rpc, we have to clear B_CLUSTEROK as well. 1190 */ 1191 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 1192 1193 if (error) { 1194 bp->b_ioflags |= BIO_ERROR; 1195 brelse(bp); 1196 break; 1197 } 1198 1199 /* 1200 * Only update dirtyoff/dirtyend if not a degenerate 1201 * condition. 1202 */ 1203 if (n) { 1204 if (bp->b_dirtyend > 0) { 1205 bp->b_dirtyoff = min(on, bp->b_dirtyoff); 1206 bp->b_dirtyend = max((on + n), bp->b_dirtyend); 1207 } else { 1208 bp->b_dirtyoff = on; 1209 bp->b_dirtyend = on + n; 1210 } 1211 vfs_bio_set_valid(bp, on, n); 1212 } 1213 1214 /* 1215 * If IO_SYNC do bwrite(). 1216 * 1217 * IO_INVAL appears to be unused. The idea appears to be 1218 * to turn off caching in this case. Very odd. XXX 1219 */ 1220 if ((ioflag & IO_SYNC)) { 1221 if (ioflag & IO_INVAL) 1222 bp->b_flags |= B_NOCACHE; 1223 error = bwrite(bp); 1224 if (error) 1225 break; 1226 } else if ((n + on) == biosize) { 1227 bp->b_flags |= B_ASYNC; 1228 (void) ncl_writebp(bp, 0, NULL); 1229 } else { 1230 bdwrite(bp); 1231 } 1232 } while (uio->uio_resid > 0 && n > 0); 1233 1234 return (error); 1235 } 1236 1237 /* 1238 * Get an nfs cache block. 1239 * 1240 * Allocate a new one if the block isn't currently in the cache 1241 * and return the block marked busy. If the calling process is 1242 * interrupted by a signal for an interruptible mount point, return 1243 * NULL. 1244 * 1245 * The caller must carefully deal with the possible B_INVAL state of 1246 * the buffer. ncl_doio() clears B_INVAL (and ncl_asyncio() clears it 1247 * indirectly), so synchronous reads can be issued without worrying about 1248 * the B_INVAL state. We have to be a little more careful when dealing 1249 * with writes (see comments in nfs_write()) when extending a file past 1250 * its EOF. 1251 */ 1252 static struct buf * 1253 nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct thread *td) 1254 { 1255 struct buf *bp; 1256 struct mount *mp; 1257 struct nfsmount *nmp; 1258 1259 mp = vp->v_mount; 1260 nmp = VFSTONFS(mp); 1261 1262 if (nmp->nm_flag & NFSMNT_INT) { 1263 sigset_t oldset; 1264 1265 newnfs_set_sigmask(td, &oldset); 1266 bp = getblk(vp, bn, size, NFS_PCATCH, 0, 0); 1267 newnfs_restore_sigmask(td, &oldset); 1268 while (bp == NULL) { 1269 if (newnfs_sigintr(nmp, td)) 1270 return (NULL); 1271 bp = getblk(vp, bn, size, 0, 2 * hz, 0); 1272 } 1273 } else { 1274 bp = getblk(vp, bn, size, 0, 0, 0); 1275 } 1276 1277 if (vp->v_type == VREG) 1278 bp->b_blkno = bn * (vp->v_bufobj.bo_bsize / DEV_BSIZE); 1279 return (bp); 1280 } 1281 1282 /* 1283 * Flush and invalidate all dirty buffers. If another process is already 1284 * doing the flush, just wait for completion. 1285 */ 1286 int 1287 ncl_vinvalbuf(struct vnode *vp, int flags, struct thread *td, int intrflg) 1288 { 1289 struct nfsnode *np = VTONFS(vp); 1290 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 1291 int error = 0, slpflag, slptimeo; 1292 int old_lock = 0; 1293 1294 ASSERT_VOP_LOCKED(vp, "ncl_vinvalbuf"); 1295 1296 if ((nmp->nm_flag & NFSMNT_INT) == 0) 1297 intrflg = 0; 1298 if ((nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)) 1299 intrflg = 1; 1300 if (intrflg) { 1301 slpflag = NFS_PCATCH; 1302 slptimeo = 2 * hz; 1303 } else { 1304 slpflag = 0; 1305 slptimeo = 0; 1306 } 1307 1308 old_lock = ncl_upgrade_vnlock(vp); 1309 if (vp->v_iflag & VI_DOOMED) { 1310 /* 1311 * Since vgonel() uses the generic vinvalbuf() to flush 1312 * dirty buffers and it does not call this function, it 1313 * is safe to just return OK when VI_DOOMED is set. 1314 */ 1315 ncl_downgrade_vnlock(vp, old_lock); 1316 return (0); 1317 } 1318 1319 /* 1320 * Now, flush as required. 1321 */ 1322 if ((flags & V_SAVE) && (vp->v_bufobj.bo_object != NULL)) { 1323 VM_OBJECT_LOCK(vp->v_bufobj.bo_object); 1324 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC); 1325 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object); 1326 /* 1327 * If the page clean was interrupted, fail the invalidation. 1328 * Not doing so, we run the risk of losing dirty pages in the 1329 * vinvalbuf() call below. 1330 */ 1331 if (intrflg && (error = newnfs_sigintr(nmp, td))) 1332 goto out; 1333 } 1334 1335 error = vinvalbuf(vp, flags, slpflag, 0); 1336 while (error) { 1337 if (intrflg && (error = newnfs_sigintr(nmp, td))) 1338 goto out; 1339 error = vinvalbuf(vp, flags, 0, slptimeo); 1340 } 1341 mtx_lock(&np->n_mtx); 1342 if (np->n_directio_asyncwr == 0) 1343 np->n_flag &= ~NMODIFIED; 1344 mtx_unlock(&np->n_mtx); 1345 out: 1346 ncl_downgrade_vnlock(vp, old_lock); 1347 return error; 1348 } 1349 1350 /* 1351 * Initiate asynchronous I/O. Return an error if no nfsiods are available. 1352 * This is mainly to avoid queueing async I/O requests when the nfsiods 1353 * are all hung on a dead server. 1354 * 1355 * Note: ncl_asyncio() does not clear (BIO_ERROR|B_INVAL) but when the bp 1356 * is eventually dequeued by the async daemon, ncl_doio() *will*. 1357 */ 1358 int 1359 ncl_asyncio(struct nfsmount *nmp, struct buf *bp, struct ucred *cred, struct thread *td) 1360 { 1361 int iod; 1362 int gotiod; 1363 int slpflag = 0; 1364 int slptimeo = 0; 1365 int error, error2; 1366 1367 /* 1368 * Commits are usually short and sweet so lets save some cpu and 1369 * leave the async daemons for more important rpc's (such as reads 1370 * and writes). 1371 * 1372 * Readdirplus RPCs do vget()s to acquire the vnodes for entries 1373 * in the directory in order to update attributes. This can deadlock 1374 * with another thread that is waiting for async I/O to be done by 1375 * an nfsiod thread while holding a lock on one of these vnodes. 1376 * To avoid this deadlock, don't allow the async nfsiod threads to 1377 * perform Readdirplus RPCs. 1378 */ 1379 mtx_lock(&ncl_iod_mutex); 1380 if ((bp->b_iocmd == BIO_WRITE && (bp->b_flags & B_NEEDCOMMIT) && 1381 (nmp->nm_bufqiods > ncl_numasync / 2)) || 1382 (bp->b_vp->v_type == VDIR && (nmp->nm_flag & NFSMNT_RDIRPLUS))) { 1383 mtx_unlock(&ncl_iod_mutex); 1384 return(EIO); 1385 } 1386 again: 1387 if (nmp->nm_flag & NFSMNT_INT) 1388 slpflag = NFS_PCATCH; 1389 gotiod = FALSE; 1390 1391 /* 1392 * Find a free iod to process this request. 1393 */ 1394 for (iod = 0; iod < ncl_numasync; iod++) 1395 if (ncl_iodwant[iod] == NFSIOD_AVAILABLE) { 1396 gotiod = TRUE; 1397 break; 1398 } 1399 1400 /* 1401 * Try to create one if none are free. 1402 */ 1403 if (!gotiod) 1404 ncl_nfsiodnew(); 1405 else { 1406 /* 1407 * Found one, so wake it up and tell it which 1408 * mount to process. 1409 */ 1410 NFS_DPF(ASYNCIO, ("ncl_asyncio: waking iod %d for mount %p\n", 1411 iod, nmp)); 1412 ncl_iodwant[iod] = NFSIOD_NOT_AVAILABLE; 1413 ncl_iodmount[iod] = nmp; 1414 nmp->nm_bufqiods++; 1415 wakeup(&ncl_iodwant[iod]); 1416 } 1417 1418 /* 1419 * If none are free, we may already have an iod working on this mount 1420 * point. If so, it will process our request. 1421 */ 1422 if (!gotiod) { 1423 if (nmp->nm_bufqiods > 0) { 1424 NFS_DPF(ASYNCIO, 1425 ("ncl_asyncio: %d iods are already processing mount %p\n", 1426 nmp->nm_bufqiods, nmp)); 1427 gotiod = TRUE; 1428 } 1429 } 1430 1431 /* 1432 * If we have an iod which can process the request, then queue 1433 * the buffer. 1434 */ 1435 if (gotiod) { 1436 /* 1437 * Ensure that the queue never grows too large. We still want 1438 * to asynchronize so we block rather then return EIO. 1439 */ 1440 while (nmp->nm_bufqlen >= 2*ncl_numasync) { 1441 NFS_DPF(ASYNCIO, 1442 ("ncl_asyncio: waiting for mount %p queue to drain\n", nmp)); 1443 nmp->nm_bufqwant = TRUE; 1444 error = newnfs_msleep(td, &nmp->nm_bufq, 1445 &ncl_iod_mutex, slpflag | PRIBIO, "nfsaio", 1446 slptimeo); 1447 if (error) { 1448 error2 = newnfs_sigintr(nmp, td); 1449 if (error2) { 1450 mtx_unlock(&ncl_iod_mutex); 1451 return (error2); 1452 } 1453 if (slpflag == NFS_PCATCH) { 1454 slpflag = 0; 1455 slptimeo = 2 * hz; 1456 } 1457 } 1458 /* 1459 * We might have lost our iod while sleeping, 1460 * so check and loop if nescessary. 1461 */ 1462 goto again; 1463 } 1464 1465 /* We might have lost our nfsiod */ 1466 if (nmp->nm_bufqiods == 0) { 1467 NFS_DPF(ASYNCIO, 1468 ("ncl_asyncio: no iods after mount %p queue was drained, looping\n", nmp)); 1469 goto again; 1470 } 1471 1472 if (bp->b_iocmd == BIO_READ) { 1473 if (bp->b_rcred == NOCRED && cred != NOCRED) 1474 bp->b_rcred = crhold(cred); 1475 } else { 1476 if (bp->b_wcred == NOCRED && cred != NOCRED) 1477 bp->b_wcred = crhold(cred); 1478 } 1479 1480 if (bp->b_flags & B_REMFREE) 1481 bremfreef(bp); 1482 BUF_KERNPROC(bp); 1483 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist); 1484 nmp->nm_bufqlen++; 1485 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) { 1486 mtx_lock(&(VTONFS(bp->b_vp))->n_mtx); 1487 VTONFS(bp->b_vp)->n_flag |= NMODIFIED; 1488 VTONFS(bp->b_vp)->n_directio_asyncwr++; 1489 mtx_unlock(&(VTONFS(bp->b_vp))->n_mtx); 1490 } 1491 mtx_unlock(&ncl_iod_mutex); 1492 return (0); 1493 } 1494 1495 mtx_unlock(&ncl_iod_mutex); 1496 1497 /* 1498 * All the iods are busy on other mounts, so return EIO to 1499 * force the caller to process the i/o synchronously. 1500 */ 1501 NFS_DPF(ASYNCIO, ("ncl_asyncio: no iods available, i/o is synchronous\n")); 1502 return (EIO); 1503 } 1504 1505 void 1506 ncl_doio_directwrite(struct buf *bp) 1507 { 1508 int iomode, must_commit; 1509 struct uio *uiop = (struct uio *)bp->b_caller1; 1510 char *iov_base = uiop->uio_iov->iov_base; 1511 1512 iomode = NFSWRITE_FILESYNC; 1513 uiop->uio_td = NULL; /* NULL since we're in nfsiod */ 1514 ncl_writerpc(bp->b_vp, uiop, bp->b_wcred, &iomode, &must_commit, 0); 1515 KASSERT((must_commit == 0), ("ncl_doio_directwrite: Did not commit write")); 1516 free(iov_base, M_NFSDIRECTIO); 1517 free(uiop->uio_iov, M_NFSDIRECTIO); 1518 free(uiop, M_NFSDIRECTIO); 1519 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) { 1520 struct nfsnode *np = VTONFS(bp->b_vp); 1521 mtx_lock(&np->n_mtx); 1522 np->n_directio_asyncwr--; 1523 if (np->n_directio_asyncwr == 0) { 1524 np->n_flag &= ~NMODIFIED; 1525 if ((np->n_flag & NFSYNCWAIT)) { 1526 np->n_flag &= ~NFSYNCWAIT; 1527 wakeup((caddr_t)&np->n_directio_asyncwr); 1528 } 1529 } 1530 mtx_unlock(&np->n_mtx); 1531 } 1532 bp->b_vp = NULL; 1533 relpbuf(bp, &ncl_pbuf_freecnt); 1534 } 1535 1536 /* 1537 * Do an I/O operation to/from a cache block. This may be called 1538 * synchronously or from an nfsiod. 1539 */ 1540 int 1541 ncl_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td, 1542 int called_from_strategy) 1543 { 1544 struct uio *uiop; 1545 struct nfsnode *np; 1546 struct nfsmount *nmp; 1547 int error = 0, iomode, must_commit = 0; 1548 struct uio uio; 1549 struct iovec io; 1550 struct proc *p = td ? td->td_proc : NULL; 1551 uint8_t iocmd; 1552 1553 np = VTONFS(vp); 1554 nmp = VFSTONFS(vp->v_mount); 1555 uiop = &uio; 1556 uiop->uio_iov = &io; 1557 uiop->uio_iovcnt = 1; 1558 uiop->uio_segflg = UIO_SYSSPACE; 1559 uiop->uio_td = td; 1560 1561 /* 1562 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We 1563 * do this here so we do not have to do it in all the code that 1564 * calls us. 1565 */ 1566 bp->b_flags &= ~B_INVAL; 1567 bp->b_ioflags &= ~BIO_ERROR; 1568 1569 KASSERT(!(bp->b_flags & B_DONE), ("ncl_doio: bp %p already marked done", bp)); 1570 iocmd = bp->b_iocmd; 1571 if (iocmd == BIO_READ) { 1572 io.iov_len = uiop->uio_resid = bp->b_bcount; 1573 io.iov_base = bp->b_data; 1574 uiop->uio_rw = UIO_READ; 1575 1576 switch (vp->v_type) { 1577 case VREG: 1578 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE; 1579 NFSINCRGLOBAL(newnfsstats.read_bios); 1580 error = ncl_readrpc(vp, uiop, cr); 1581 1582 if (!error) { 1583 if (uiop->uio_resid) { 1584 /* 1585 * If we had a short read with no error, we must have 1586 * hit a file hole. We should zero-fill the remainder. 1587 * This can also occur if the server hits the file EOF. 1588 * 1589 * Holes used to be able to occur due to pending 1590 * writes, but that is not possible any longer. 1591 */ 1592 int nread = bp->b_bcount - uiop->uio_resid; 1593 int left = uiop->uio_resid; 1594 1595 if (left > 0) 1596 bzero((char *)bp->b_data + nread, left); 1597 uiop->uio_resid = 0; 1598 } 1599 } 1600 /* ASSERT_VOP_LOCKED(vp, "ncl_doio"); */ 1601 if (p && (vp->v_vflag & VV_TEXT)) { 1602 mtx_lock(&np->n_mtx); 1603 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &np->n_vattr.na_mtime)) { 1604 mtx_unlock(&np->n_mtx); 1605 PROC_LOCK(p); 1606 killproc(p, "text file modification"); 1607 PROC_UNLOCK(p); 1608 } else 1609 mtx_unlock(&np->n_mtx); 1610 } 1611 break; 1612 case VLNK: 1613 uiop->uio_offset = (off_t)0; 1614 NFSINCRGLOBAL(newnfsstats.readlink_bios); 1615 error = ncl_readlinkrpc(vp, uiop, cr); 1616 break; 1617 case VDIR: 1618 NFSINCRGLOBAL(newnfsstats.readdir_bios); 1619 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ; 1620 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) != 0) { 1621 error = ncl_readdirplusrpc(vp, uiop, cr, td); 1622 if (error == NFSERR_NOTSUPP) 1623 nmp->nm_flag &= ~NFSMNT_RDIRPLUS; 1624 } 1625 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0) 1626 error = ncl_readdirrpc(vp, uiop, cr, td); 1627 /* 1628 * end-of-directory sets B_INVAL but does not generate an 1629 * error. 1630 */ 1631 if (error == 0 && uiop->uio_resid == bp->b_bcount) 1632 bp->b_flags |= B_INVAL; 1633 break; 1634 default: 1635 ncl_printf("ncl_doio: type %x unexpected\n", vp->v_type); 1636 break; 1637 }; 1638 if (error) { 1639 bp->b_ioflags |= BIO_ERROR; 1640 bp->b_error = error; 1641 } 1642 } else { 1643 /* 1644 * If we only need to commit, try to commit 1645 */ 1646 if (bp->b_flags & B_NEEDCOMMIT) { 1647 int retv; 1648 off_t off; 1649 1650 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff; 1651 retv = ncl_commit(vp, off, bp->b_dirtyend-bp->b_dirtyoff, 1652 bp->b_wcred, td); 1653 if (retv == 0) { 1654 bp->b_dirtyoff = bp->b_dirtyend = 0; 1655 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 1656 bp->b_resid = 0; 1657 bufdone(bp); 1658 return (0); 1659 } 1660 if (retv == NFSERR_STALEWRITEVERF) { 1661 ncl_clearcommit(vp->v_mount); 1662 } 1663 } 1664 1665 /* 1666 * Setup for actual write 1667 */ 1668 mtx_lock(&np->n_mtx); 1669 if ((off_t)bp->b_blkno * DEV_BSIZE + bp->b_dirtyend > np->n_size) 1670 bp->b_dirtyend = np->n_size - (off_t)bp->b_blkno * DEV_BSIZE; 1671 mtx_unlock(&np->n_mtx); 1672 1673 if (bp->b_dirtyend > bp->b_dirtyoff) { 1674 io.iov_len = uiop->uio_resid = bp->b_dirtyend 1675 - bp->b_dirtyoff; 1676 uiop->uio_offset = (off_t)bp->b_blkno * DEV_BSIZE 1677 + bp->b_dirtyoff; 1678 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 1679 uiop->uio_rw = UIO_WRITE; 1680 NFSINCRGLOBAL(newnfsstats.write_bios); 1681 1682 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC) 1683 iomode = NFSWRITE_UNSTABLE; 1684 else 1685 iomode = NFSWRITE_FILESYNC; 1686 1687 error = ncl_writerpc(vp, uiop, cr, &iomode, &must_commit, 1688 called_from_strategy); 1689 1690 /* 1691 * When setting B_NEEDCOMMIT also set B_CLUSTEROK to try 1692 * to cluster the buffers needing commit. This will allow 1693 * the system to submit a single commit rpc for the whole 1694 * cluster. We can do this even if the buffer is not 100% 1695 * dirty (relative to the NFS blocksize), so we optimize the 1696 * append-to-file-case. 1697 * 1698 * (when clearing B_NEEDCOMMIT, B_CLUSTEROK must also be 1699 * cleared because write clustering only works for commit 1700 * rpc's, not for the data portion of the write). 1701 */ 1702 1703 if (!error && iomode == NFSWRITE_UNSTABLE) { 1704 bp->b_flags |= B_NEEDCOMMIT; 1705 if (bp->b_dirtyoff == 0 1706 && bp->b_dirtyend == bp->b_bcount) 1707 bp->b_flags |= B_CLUSTEROK; 1708 } else { 1709 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); 1710 } 1711 1712 /* 1713 * For an interrupted write, the buffer is still valid 1714 * and the write hasn't been pushed to the server yet, 1715 * so we can't set BIO_ERROR and report the interruption 1716 * by setting B_EINTR. For the B_ASYNC case, B_EINTR 1717 * is not relevant, so the rpc attempt is essentially 1718 * a noop. For the case of a V3 write rpc not being 1719 * committed to stable storage, the block is still 1720 * dirty and requires either a commit rpc or another 1721 * write rpc with iomode == NFSV3WRITE_FILESYNC before 1722 * the block is reused. This is indicated by setting 1723 * the B_DELWRI and B_NEEDCOMMIT flags. 1724 * 1725 * EIO is returned by ncl_writerpc() to indicate a recoverable 1726 * write error and is handled as above, except that 1727 * B_EINTR isn't set. One cause of this is a stale stateid 1728 * error for the RPC that indicates recovery is required, 1729 * when called with called_from_strategy != 0. 1730 * 1731 * If the buffer is marked B_PAGING, it does not reside on 1732 * the vp's paging queues so we cannot call bdirty(). The 1733 * bp in this case is not an NFS cache block so we should 1734 * be safe. XXX 1735 * 1736 * The logic below breaks up errors into recoverable and 1737 * unrecoverable. For the former, we clear B_INVAL|B_NOCACHE 1738 * and keep the buffer around for potential write retries. 1739 * For the latter (eg ESTALE), we toss the buffer away (B_INVAL) 1740 * and save the error in the nfsnode. This is less than ideal 1741 * but necessary. Keeping such buffers around could potentially 1742 * cause buffer exhaustion eventually (they can never be written 1743 * out, so will get constantly be re-dirtied). It also causes 1744 * all sorts of vfs panics. For non-recoverable write errors, 1745 * also invalidate the attrcache, so we'll be forced to go over 1746 * the wire for this object, returning an error to user on next 1747 * call (most of the time). 1748 */ 1749 if (error == EINTR || error == EIO || error == ETIMEDOUT 1750 || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 1751 int s; 1752 1753 s = splbio(); 1754 bp->b_flags &= ~(B_INVAL|B_NOCACHE); 1755 if ((bp->b_flags & B_PAGING) == 0) { 1756 bdirty(bp); 1757 bp->b_flags &= ~B_DONE; 1758 } 1759 if ((error == EINTR || error == ETIMEDOUT) && 1760 (bp->b_flags & B_ASYNC) == 0) 1761 bp->b_flags |= B_EINTR; 1762 splx(s); 1763 } else { 1764 if (error) { 1765 bp->b_ioflags |= BIO_ERROR; 1766 bp->b_flags |= B_INVAL; 1767 bp->b_error = np->n_error = error; 1768 mtx_lock(&np->n_mtx); 1769 np->n_flag |= NWRITEERR; 1770 np->n_attrstamp = 0; 1771 mtx_unlock(&np->n_mtx); 1772 } 1773 bp->b_dirtyoff = bp->b_dirtyend = 0; 1774 } 1775 } else { 1776 bp->b_resid = 0; 1777 bufdone(bp); 1778 return (0); 1779 } 1780 } 1781 bp->b_resid = uiop->uio_resid; 1782 if (must_commit) 1783 ncl_clearcommit(vp->v_mount); 1784 bufdone(bp); 1785 return (error); 1786 } 1787 1788 /* 1789 * Used to aid in handling ftruncate() operations on the NFS client side. 1790 * Truncation creates a number of special problems for NFS. We have to 1791 * throw away VM pages and buffer cache buffers that are beyond EOF, and 1792 * we have to properly handle VM pages or (potentially dirty) buffers 1793 * that straddle the truncation point. 1794 */ 1795 1796 int 1797 ncl_meta_setsize(struct vnode *vp, struct ucred *cred, struct thread *td, u_quad_t nsize) 1798 { 1799 struct nfsnode *np = VTONFS(vp); 1800 u_quad_t tsize; 1801 int biosize = vp->v_bufobj.bo_bsize; 1802 int error = 0; 1803 1804 mtx_lock(&np->n_mtx); 1805 tsize = np->n_size; 1806 np->n_size = nsize; 1807 mtx_unlock(&np->n_mtx); 1808 1809 if (nsize < tsize) { 1810 struct buf *bp; 1811 daddr_t lbn; 1812 int bufsize; 1813 1814 /* 1815 * vtruncbuf() doesn't get the buffer overlapping the 1816 * truncation point. We may have a B_DELWRI and/or B_CACHE 1817 * buffer that now needs to be truncated. 1818 */ 1819 error = vtruncbuf(vp, cred, td, nsize, biosize); 1820 lbn = nsize / biosize; 1821 bufsize = nsize & (biosize - 1); 1822 bp = nfs_getcacheblk(vp, lbn, bufsize, td); 1823 if (!bp) 1824 return EINTR; 1825 if (bp->b_dirtyoff > bp->b_bcount) 1826 bp->b_dirtyoff = bp->b_bcount; 1827 if (bp->b_dirtyend > bp->b_bcount) 1828 bp->b_dirtyend = bp->b_bcount; 1829 bp->b_flags |= B_RELBUF; /* don't leave garbage around */ 1830 brelse(bp); 1831 } else { 1832 vnode_pager_setsize(vp, nsize); 1833 } 1834 return(error); 1835 } 1836
Cache object: 23f1ce4d7e5663b24b9cd4e2a3f5930b
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