1/* $OpenBSD: nfs_bio.c,v 1.86 2024/05/01 13:15:59 jsg Exp $ */ 2/* $NetBSD: nfs_bio.c,v 1.25.4.2 1996/07/08 20:47:04 jtc Exp $ */ 3 4/* 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)nfs_bio.c 8.9 (Berkeley) 3/30/95 36 */ 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/signalvar.h> 41#include <sys/proc.h> 42#include <sys/buf.h> 43#include <sys/vnode.h> 44#include <sys/mount.h> 45#include <sys/queue.h> 46#include <sys/time.h> 47 48#include <nfs/nfsproto.h> 49#include <nfs/nfs.h> 50#include <nfs/nfsmount.h> 51#include <nfs/nfsnode.h> 52#include <nfs/nfs_var.h> 53 54extern int nfs_numasync; 55extern struct nfsstats nfsstats; 56struct nfs_bufqhead nfs_bufq; 57uint32_t nfs_bufqmax, nfs_bufqlen; 58 59struct buf *nfs_getcacheblk(struct vnode *, daddr_t, int, struct proc *); 60 61/* 62 * Vnode op for read using bio 63 * Any similarity to readip() is purely coincidental 64 */ 65int 66nfs_bioread(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred) 67{ 68 struct nfsnode *np = VTONFS(vp); 69 int biosize, diff; 70 struct buf *bp = NULL, *rabp; 71 struct vattr vattr; 72 struct proc *p; 73 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 74 daddr_t lbn, bn, rabn; 75 caddr_t baddr; 76 int got_buf = 0, nra, error = 0, n = 0, on = 0, not_readin; 77 off_t offdiff; 78 79#ifdef DIAGNOSTIC 80 if (uio->uio_rw != UIO_READ) 81 panic("nfs_read mode"); 82#endif 83 if (uio->uio_resid == 0) 84 return (0); 85 if (uio->uio_offset < 0) 86 return (EINVAL); 87 p = uio->uio_procp; 88 if ((nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_GOTFSINFO)) == NFSMNT_NFSV3) 89 (void)nfs_fsinfo(nmp, vp, cred, p); 90 biosize = nmp->nm_rsize; 91 /* 92 * For nfs, cache consistency can only be maintained approximately. 93 * Although RFC1094 does not specify the criteria, the following is 94 * believed to be compatible with the reference port. 95 * For nfs: 96 * If the file's modify time on the server has changed since the 97 * last read rpc or you have written to the file, 98 * you may have lost data cache consistency with the 99 * server, so flush all of the file's data out of the cache. 100 * Then force a getattr rpc to ensure that you have up to date 101 * attributes. 102 */ 103 if (np->n_flag & NMODIFIED) { 104 NFS_INVALIDATE_ATTRCACHE(np); 105 error = VOP_GETATTR(vp, &vattr, cred, p); 106 if (error) 107 return (error); 108 np->n_mtime = vattr.va_mtime; 109 } else { 110 error = VOP_GETATTR(vp, &vattr, cred, p); 111 if (error) 112 return (error); 113 if (timespeccmp(&np->n_mtime, &vattr.va_mtime, !=)) { 114 error = nfs_vinvalbuf(vp, V_SAVE, cred, p); 115 if (error) 116 return (error); 117 np->n_mtime = vattr.va_mtime; 118 } 119 } 120 121 /* 122 * update the cache read creds for this vnode 123 */ 124 if (np->n_rcred) 125 crfree(np->n_rcred); 126 np->n_rcred = cred; 127 crhold(cred); 128 129 do { 130 if ((vp->v_flag & VROOT) && vp->v_type == VLNK) { 131 return (nfs_readlinkrpc(vp, uio, cred)); 132 } 133 baddr = NULL; 134 switch (vp->v_type) { 135 case VREG: 136 nfsstats.biocache_reads++; 137 lbn = uio->uio_offset / biosize; 138 on = uio->uio_offset & (biosize - 1); 139 bn = lbn * (biosize / DEV_BSIZE); 140 not_readin = 1; 141 142 /* 143 * Start the read ahead(s), as required. 144 */ 145 if (nfs_numasync > 0 && nmp->nm_readahead > 0) { 146 for (nra = 0; nra < nmp->nm_readahead && 147 (lbn + 1 + nra) * biosize < np->n_size; nra++) { 148 rabn = (lbn + 1 + nra) * (biosize / DEV_BSIZE); 149 if (!incore(vp, rabn)) { 150 rabp = nfs_getcacheblk(vp, rabn, biosize, p); 151 if (!rabp) 152 return (EINTR); 153 if ((rabp->b_flags & (B_DELWRI | B_DONE)) == 0) { 154 rabp->b_flags |= (B_READ | B_ASYNC); 155 if (nfs_asyncio(rabp, 1)) { 156 rabp->b_flags |= B_INVAL; 157 brelse(rabp); 158 } 159 } else 160 brelse(rabp); 161 } 162 } 163 } 164 165again: 166 bp = nfs_getcacheblk(vp, bn, biosize, p); 167 if (!bp) 168 return (EINTR); 169 got_buf = 1; 170 if ((bp->b_flags & (B_DONE | B_DELWRI)) == 0) { 171 bp->b_flags |= B_READ; 172 not_readin = 0; 173 error = nfs_doio(bp, p); 174 if (error) { 175 brelse(bp); 176 return (error); 177 } 178 } 179 n = ulmin(biosize - on, uio->uio_resid); 180 offdiff = np->n_size - uio->uio_offset; 181 if (offdiff < (off_t)n) 182 n = (int)offdiff; 183 if (not_readin && n > 0) { 184 if (on < bp->b_validoff || (on + n) > bp->b_validend) { 185 bp->b_flags |= B_INVAFTERWRITE; 186 if (bp->b_dirtyend > 0) { 187 if ((bp->b_flags & B_DELWRI) == 0) 188 panic("nfsbioread"); 189 if (VOP_BWRITE(bp) == EINTR) 190 return (EINTR); 191 } else 192 brelse(bp); 193 goto again; 194 } 195 } 196 diff = (on >= bp->b_validend) ? 0 : (bp->b_validend - on); 197 if (diff < n) 198 n = diff; 199 break; 200 case VLNK: 201 nfsstats.biocache_readlinks++; 202 bp = nfs_getcacheblk(vp, 0, NFS_MAXPATHLEN, p); 203 if (!bp) 204 return (EINTR); 205 if ((bp->b_flags & B_DONE) == 0) { 206 bp->b_flags |= B_READ; 207 error = nfs_doio(bp, p); 208 if (error) { 209 brelse(bp); 210 return (error); 211 } 212 } 213 n = ulmin(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid); 214 got_buf = 1; 215 on = 0; 216 break; 217 default: 218 panic("nfsbioread: type %x unexpected", vp->v_type); 219 break; 220 } 221 222 if (n > 0) { 223 if (!baddr) 224 baddr = bp->b_data; 225 error = uiomove(baddr + on, n, uio); 226 } 227 228 if (vp->v_type == VLNK) 229 n = 0; 230 231 if (got_buf) 232 brelse(bp); 233 } while (error == 0 && uio->uio_resid > 0 && n > 0); 234 return (error); 235} 236 237/* 238 * Vnode op for write using bio 239 */ 240int 241nfs_write(void *v) 242{ 243 struct vop_write_args *ap = v; 244 int biosize; 245 struct uio *uio = ap->a_uio; 246 struct proc *p = uio->uio_procp; 247 struct vnode *vp = ap->a_vp; 248 struct nfsnode *np = VTONFS(vp); 249 struct ucred *cred = ap->a_cred; 250 int ioflag = ap->a_ioflag; 251 struct buf *bp; 252 struct vattr vattr; 253 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 254 daddr_t lbn, bn; 255 int n, on, error = 0, extended = 0, wrotedta = 0, truncated = 0; 256 ssize_t overrun; 257 258#ifdef DIAGNOSTIC 259 if (uio->uio_rw != UIO_WRITE) 260 panic("nfs_write mode"); 261 if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) 262 panic("nfs_write proc"); 263#endif 264 if (vp->v_type != VREG) 265 return (EIO); 266 if (np->n_flag & NWRITEERR) { 267 np->n_flag &= ~NWRITEERR; 268 return (np->n_error); 269 } 270 if ((nmp->nm_flag & (NFSMNT_NFSV3 | NFSMNT_GOTFSINFO)) == NFSMNT_NFSV3) 271 (void)nfs_fsinfo(nmp, vp, cred, p); 272 if (ioflag & (IO_APPEND | IO_SYNC)) { 273 if (np->n_flag & NMODIFIED) { 274 NFS_INVALIDATE_ATTRCACHE(np); 275 error = nfs_vinvalbuf(vp, V_SAVE, cred, p); 276 if (error) 277 return (error); 278 } 279 if (ioflag & IO_APPEND) { 280 NFS_INVALIDATE_ATTRCACHE(np); 281 error = VOP_GETATTR(vp, &vattr, cred, p); 282 if (error) 283 return (error); 284 uio->uio_offset = np->n_size; 285 } 286 } 287 if (uio->uio_offset < 0) 288 return (EINVAL); 289 if (uio->uio_resid == 0) 290 return (0); 291 292 /* do the filesize rlimit check */ 293 if ((error = vn_fsizechk(vp, uio, ioflag, &overrun))) 294 return (error); 295 296 /* 297 * update the cache write creds for this node. 298 */ 299 if (np->n_wcred) 300 crfree(np->n_wcred); 301 np->n_wcred = cred; 302 crhold(cred); 303 304 /* 305 * I use nm_rsize, not nm_wsize so that all buffer cache blocks 306 * will be the same size within a filesystem. nfs_writerpc will 307 * still use nm_wsize when sizing the rpc's. 308 */ 309 biosize = nmp->nm_rsize; 310 do { 311 312 /* 313 * XXX make sure we aren't cached in the VM page cache 314 */ 315 uvm_vnp_uncache(vp); 316 317 nfsstats.biocache_writes++; 318 lbn = uio->uio_offset / biosize; 319 on = uio->uio_offset & (biosize-1); 320 n = ulmin(biosize - on, uio->uio_resid); 321 bn = lbn * (biosize / DEV_BSIZE); 322again: 323 bp = nfs_getcacheblk(vp, bn, biosize, p); 324 if (!bp) { 325 error = EINTR; 326 goto out; 327 } 328 np->n_flag |= NMODIFIED; 329 if (uio->uio_offset + n > np->n_size) { 330 np->n_size = uio->uio_offset + n; 331 uvm_vnp_setsize(vp, np->n_size); 332 extended = 1; 333 } else if (uio->uio_offset + n < np->n_size) 334 truncated = 1; 335 336 /* 337 * If the new write will leave a contiguous dirty 338 * area, just update the b_dirtyoff and b_dirtyend, 339 * otherwise force a write rpc of the old dirty area. 340 */ 341 if (bp->b_dirtyend > 0 && 342 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) { 343 bp->b_proc = p; 344 if (VOP_BWRITE(bp) == EINTR) { 345 error = EINTR; 346 goto out; 347 } 348 goto again; 349 } 350 351 error = uiomove((char *)bp->b_data + on, n, uio); 352 if (error) { 353 bp->b_flags |= B_ERROR; 354 brelse(bp); 355 goto out; 356 } 357 if (bp->b_dirtyend > 0) { 358 bp->b_dirtyoff = min(on, bp->b_dirtyoff); 359 bp->b_dirtyend = max((on + n), bp->b_dirtyend); 360 } else { 361 bp->b_dirtyoff = on; 362 bp->b_dirtyend = on + n; 363 } 364 if (bp->b_validend == 0 || bp->b_validend < bp->b_dirtyoff || 365 bp->b_validoff > bp->b_dirtyend) { 366 bp->b_validoff = bp->b_dirtyoff; 367 bp->b_validend = bp->b_dirtyend; 368 } else { 369 bp->b_validoff = min(bp->b_validoff, bp->b_dirtyoff); 370 bp->b_validend = max(bp->b_validend, bp->b_dirtyend); 371 } 372 373 wrotedta = 1; 374 375 /* 376 * Since this block is being modified, it must be written 377 * again and not just committed. 378 */ 379 380 if (NFS_ISV3(vp)) { 381 rw_enter_write(&np->n_commitlock); 382 if (bp->b_flags & B_NEEDCOMMIT) { 383 bp->b_flags &= ~B_NEEDCOMMIT; 384 nfs_del_tobecommitted_range(vp, bp); 385 } 386 nfs_del_committed_range(vp, bp); 387 rw_exit_write(&np->n_commitlock); 388 } else 389 bp->b_flags &= ~B_NEEDCOMMIT; 390 391 if (ioflag & IO_SYNC) { 392 bp->b_proc = p; 393 error = VOP_BWRITE(bp); 394 if (error) 395 goto out; 396 } else if ((n + on) == biosize) { 397 bp->b_proc = NULL; 398 bp->b_flags |= B_ASYNC; 399 (void)nfs_writebp(bp, 0); 400 } else { 401 bdwrite(bp); 402 } 403 } while (uio->uio_resid > 0 && n > 0); 404 405/*out: XXX belongs here??? */ 406 if (wrotedta) 407 VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0) | 408 (truncated ? NOTE_TRUNCATE : 0)); 409 410out: 411 /* correct the result for writes clamped by vn_fsizechk() */ 412 uio->uio_resid += overrun; 413 414 return (error); 415} 416 417/* 418 * Get an nfs cache block. 419 * Allocate a new one if the block isn't currently in the cache 420 * and return the block marked busy. If the calling process is 421 * interrupted by a signal for an interruptible mount point, return 422 * NULL. 423 */ 424struct buf * 425nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct proc *p) 426{ 427 struct buf *bp; 428 struct nfsmount *nmp = VFSTONFS(vp->v_mount); 429 430 if (nmp->nm_flag & NFSMNT_INT) { 431 bp = getblk(vp, bn, size, PCATCH, INFSLP); 432 while (bp == NULL) { 433 if (nfs_sigintr(nmp, NULL, p)) 434 return (NULL); 435 bp = getblk(vp, bn, size, 0, SEC_TO_NSEC(2)); 436 } 437 } else 438 bp = getblk(vp, bn, size, 0, INFSLP); 439 return (bp); 440} 441 442/* 443 * Flush and invalidate all dirty buffers. If another process is already 444 * doing the flush, just wait for completion. 445 */ 446int 447nfs_vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p) 448{ 449 struct nfsmount *nmp= VFSTONFS(vp->v_mount); 450 struct nfsnode *np = VTONFS(vp); 451 uint64_t stimeo; 452 int error, sintr; 453 454 stimeo = INFSLP; 455 error = sintr = 0; 456 457 if (ISSET(nmp->nm_flag, NFSMNT_INT)) { 458 sintr = PCATCH; 459 stimeo = SEC_TO_NSEC(2); 460 } 461 462 /* First wait for any other process doing a flush to complete. */ 463 while (np->n_flag & NFLUSHINPROG) { 464 np->n_flag |= NFLUSHWANT; 465 error = tsleep_nsec(&np->n_flag, PRIBIO|sintr, "nfsvinval", 466 stimeo); 467 if (error && sintr && nfs_sigintr(nmp, NULL, p)) 468 return (EINTR); 469 } 470 471 /* Now, flush as required. */ 472 np->n_flag |= NFLUSHINPROG; 473 error = vinvalbuf(vp, flags, cred, p, sintr, INFSLP); 474 while (error) { 475 if (sintr && nfs_sigintr(nmp, NULL, p)) { 476 np->n_flag &= ~NFLUSHINPROG; 477 if (np->n_flag & NFLUSHWANT) { 478 np->n_flag &= ~NFLUSHWANT; 479 wakeup(&np->n_flag); 480 } 481 return (EINTR); 482 } 483 error = vinvalbuf(vp, flags, cred, p, 0, stimeo); 484 } 485 np->n_flag &= ~(NMODIFIED | NFLUSHINPROG); 486 if (np->n_flag & NFLUSHWANT) { 487 np->n_flag &= ~NFLUSHWANT; 488 wakeup(&np->n_flag); 489 } 490 return (0); 491} 492 493/* 494 * Initiate asynchronous I/O. Return an error if no nfsiods are available. 495 * This is mainly to avoid queueing async I/O requests when the nfsiods 496 * are all hung on a dead server. 497 */ 498int 499nfs_asyncio(struct buf *bp, int readahead) 500{ 501 if (nfs_numasync == 0) 502 goto out; 503 504 while (nfs_bufqlen > nfs_bufqmax) 505 if (readahead) 506 goto out; 507 else 508 tsleep_nsec(&nfs_bufqlen, PRIBIO, "nfs_bufq", INFSLP); 509 510 if ((bp->b_flags & B_READ) == 0) { 511 bp->b_flags |= B_WRITEINPROG; 512 } 513 514 TAILQ_INSERT_TAIL(&nfs_bufq, bp, b_freelist); 515 nfs_bufqlen++; 516 517 wakeup_one(&nfs_bufq); 518 return (0); 519 520out: 521 nfsstats.forcedsync++; 522 return (EIO); 523} 524 525/* 526 * Do an I/O operation to/from a cache block. This may be called 527 * synchronously or from an nfsiod. 528 */ 529int 530nfs_doio(struct buf *bp, struct proc *p) 531{ 532 struct uio *uiop; 533 struct vnode *vp; 534 struct nfsnode *np; 535 struct nfsmount *nmp; 536 int s, error = 0, diff, len, iomode, must_commit = 0; 537 struct uio uio; 538 struct iovec io; 539 540 vp = bp->b_vp; 541 np = VTONFS(vp); 542 nmp = VFSTONFS(vp->v_mount); 543 uiop = &uio; 544 uiop->uio_iov = &io; 545 uiop->uio_iovcnt = 1; 546 uiop->uio_segflg = UIO_SYSSPACE; 547 uiop->uio_procp = p; 548 549 /* 550 * Historically, paging was done with physio, but no more. 551 */ 552 if (bp->b_flags & B_PHYS) { 553 io.iov_len = uiop->uio_resid = bp->b_bcount; 554 /* mapping was done by vmapbuf() */ 555 io.iov_base = bp->b_data; 556 uiop->uio_offset = ((off_t)bp->b_blkno) << DEV_BSHIFT; 557 if (bp->b_flags & B_READ) { 558 uiop->uio_rw = UIO_READ; 559 nfsstats.read_physios++; 560 error = nfs_readrpc(vp, uiop); 561 } else { 562 iomode = NFSV3WRITE_DATASYNC; 563 uiop->uio_rw = UIO_WRITE; 564 nfsstats.write_physios++; 565 error = nfs_writerpc(vp, uiop, &iomode, &must_commit); 566 } 567 if (error) { 568 bp->b_flags |= B_ERROR; 569 bp->b_error = error; 570 } 571 } else if (bp->b_flags & B_READ) { 572 io.iov_len = uiop->uio_resid = bp->b_bcount; 573 io.iov_base = bp->b_data; 574 uiop->uio_rw = UIO_READ; 575 switch (vp->v_type) { 576 case VREG: 577 uiop->uio_offset = ((off_t)bp->b_blkno) << DEV_BSHIFT; 578 nfsstats.read_bios++; 579 bcstats.pendingreads++; 580 bcstats.numreads++; 581 error = nfs_readrpc(vp, uiop); 582 if (!error) { 583 bp->b_validoff = 0; 584 if (uiop->uio_resid) { 585 /* 586 * If len > 0, there is a hole in the file and 587 * no writes after the hole have been pushed to 588 * the server yet. 589 * Just zero fill the rest of the valid area. 590 */ 591 diff = bp->b_bcount - uiop->uio_resid; 592 len = np->n_size - ((((off_t)bp->b_blkno) << DEV_BSHIFT) 593 + diff); 594 if (len > 0) { 595 len = ulmin(len, uiop->uio_resid); 596 memset((char *)bp->b_data + diff, 0, len); 597 bp->b_validend = diff + len; 598 } else 599 bp->b_validend = diff; 600 } else 601 bp->b_validend = bp->b_bcount; 602 } 603 if (p && (vp->v_flag & VTEXT) && 604 (timespeccmp(&np->n_mtime, &np->n_vattr.va_mtime, !=))) { 605 uprintf("Process killed due to text file modification\n"); 606 psignal(p, SIGKILL); 607 } 608 break; 609 case VLNK: 610 uiop->uio_offset = (off_t)0; 611 nfsstats.readlink_bios++; 612 bcstats.pendingreads++; 613 bcstats.numreads++; 614 error = nfs_readlinkrpc(vp, uiop, curproc->p_ucred); 615 break; 616 default: 617 panic("nfs_doio: type %x unexpected", vp->v_type); 618 break; 619 }; 620 if (error) { 621 bp->b_flags |= B_ERROR; 622 bp->b_error = error; 623 } 624 } else { 625 io.iov_len = uiop->uio_resid = bp->b_dirtyend 626 - bp->b_dirtyoff; 627 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE 628 + bp->b_dirtyoff; 629 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff; 630 uiop->uio_rw = UIO_WRITE; 631 nfsstats.write_bios++; 632 bcstats.pendingwrites++; 633 bcstats.numwrites++; 634 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE)) == B_ASYNC) 635 iomode = NFSV3WRITE_UNSTABLE; 636 else 637 iomode = NFSV3WRITE_FILESYNC; 638 bp->b_flags |= B_WRITEINPROG; 639 error = nfs_writerpc(vp, uiop, &iomode, &must_commit); 640 641 rw_enter_write(&np->n_commitlock); 642 if (!error && iomode == NFSV3WRITE_UNSTABLE) { 643 bp->b_flags |= B_NEEDCOMMIT; 644 nfs_add_tobecommitted_range(vp, bp); 645 } else { 646 bp->b_flags &= ~B_NEEDCOMMIT; 647 nfs_del_committed_range(vp, bp); 648 } 649 rw_exit_write(&np->n_commitlock); 650 651 bp->b_flags &= ~B_WRITEINPROG; 652 653 /* 654 * For an interrupted write, the buffer is still valid and the 655 * write hasn't been pushed to the server yet, so we can't set 656 * B_ERROR and report the interruption by setting B_EINTR. For 657 * the B_ASYNC case, B_EINTR is not relevant, so the rpc attempt 658 * is essentially a noop. 659 * For the case of a V3 write rpc not being committed to stable 660 * storage, the block is still dirty and requires either a commit 661 * rpc or another write rpc with iomode == NFSV3WRITE_FILESYNC 662 * before the block is reused. This is indicated by setting the 663 * B_DELWRI and B_NEEDCOMMIT flags. 664 */ 665 if (error == EINTR || (!error && (bp->b_flags & B_NEEDCOMMIT))) { 666 s = splbio(); 667 buf_dirty(bp); 668 splx(s); 669 670 if (!(bp->b_flags & B_ASYNC) && error) 671 bp->b_flags |= B_EINTR; 672 } else { 673 if (error) { 674 bp->b_flags |= B_ERROR; 675 bp->b_error = np->n_error = error; 676 np->n_flag |= NWRITEERR; 677 } 678 bp->b_dirtyoff = bp->b_dirtyend = 0; 679 } 680 } 681 bp->b_resid = uiop->uio_resid; 682 if (must_commit) 683 nfs_clearcommit(vp->v_mount); 684 s = splbio(); 685 biodone(bp); 686 splx(s); 687 return (error); 688} 689