2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
32 * @(#)nfs_bio.c 8.9 (Berkeley) 3/30/95
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/mount.h>
45 #include <sys/resourcevar.h>
46 #include <sys/signalvar.h>
47 #include <sys/vmmeter.h>
48 #include <sys/vnode.h>
51 #include <vm/vm_extern.h>
52 #include <vm/vm_page.h>
53 #include <vm/vm_object.h>
54 #include <vm/vm_pager.h>
55 #include <vm/vnode_pager.h>
57 #include <rpc/rpcclnt.h>
59 #include <nfs/rpcv2.h>
60 #include <nfs/nfsproto.h>
61 #include <nfsclient/nfs.h>
62 #include <nfsclient/nfsmount.h>
63 #include <nfsclient/nfsnode.h>
65 #include <nfs4client/nfs4.h>
67 static struct buf *nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size,
69 static int nfs_directio_write(struct vnode *vp, struct uio *uiop,
70 struct ucred *cred, int ioflag);
72 extern int nfs_directio_enable;
73 extern int nfs_directio_allow_mmap;
76 * Vnode op for VM getpages.
79 nfs_getpages(struct vop_getpages_args *ap)
81 int i, error, nextoff, size, toff, count, npages;
96 td = curthread; /* XXX */
97 cred = curthread->td_ucred; /* XXX */
98 nmp = VFSTONFS(vp->v_mount);
102 if ((object = vp->v_object) == NULL) {
103 nfs_printf("nfs_getpages: called with non-merged cache vnode??\n");
104 return VM_PAGER_ERROR;
107 if (nfs_directio_enable && !nfs_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 nfs_printf("nfs_getpages: called on non-cacheable vnode??\n");
112 return VM_PAGER_ERROR;
114 mtx_unlock(&np->n_mtx);
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)nfs_fsinfo(nmp, vp, cred, td);
124 mtx_unlock(&nmp->nm_mtx);
126 npages = btoc(count);
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.
135 vm_page_t m = pages[ap->a_reqpage];
137 VM_OBJECT_LOCK(object);
138 vm_page_lock_queues();
140 /* handled by vm_fault now */
141 /* vm_page_zero_invalid(m, TRUE); */
142 for (i = 0; i < npages; ++i) {
143 if (i != ap->a_reqpage)
144 vm_page_free(pages[i]);
146 vm_page_unlock_queues();
147 VM_OBJECT_UNLOCK(object);
150 vm_page_unlock_queues();
151 VM_OBJECT_UNLOCK(object);
155 * We use only the kva address for the buffer, but this is extremely
156 * convienient and fast.
158 bp = getpbuf(&nfs_pbuf_freecnt);
160 kva = (vm_offset_t) bp->b_data;
161 pmap_qenter(kva, pages, npages);
163 cnt.v_vnodepgsin += npages;
165 iov.iov_base = (caddr_t) kva;
169 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
170 uio.uio_resid = count;
171 uio.uio_segflg = UIO_SYSSPACE;
172 uio.uio_rw = UIO_READ;
175 error = (nmp->nm_rpcops->nr_readrpc)(vp, &uio, cred);
176 pmap_qremove(kva, npages);
178 relpbuf(bp, &nfs_pbuf_freecnt);
180 if (error && (uio.uio_resid == count)) {
181 nfs_printf("nfs_getpages: error %d\n", error);
182 VM_OBJECT_LOCK(object);
183 vm_page_lock_queues();
184 for (i = 0; i < npages; ++i) {
185 if (i != ap->a_reqpage)
186 vm_page_free(pages[i]);
188 vm_page_unlock_queues();
189 VM_OBJECT_UNLOCK(object);
190 return VM_PAGER_ERROR;
194 * Calculate the number of bytes read and validate only that number
195 * of bytes. Note that due to pending writes, size may be 0. This
196 * does not mean that the remaining data is invalid!
199 size = count - uio.uio_resid;
200 VM_OBJECT_LOCK(object);
201 vm_page_lock_queues();
202 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
204 nextoff = toff + PAGE_SIZE;
207 if (nextoff <= size) {
209 * Read operation filled an entire page
211 m->valid = VM_PAGE_BITS_ALL;
213 } else if (size > toff) {
215 * Read operation filled a partial page.
218 vm_page_set_validclean(m, 0, size - toff);
219 /* handled by vm_fault now */
220 /* vm_page_zero_invalid(m, TRUE); */
223 * Read operation was short. If no error occured
224 * we may have hit a zero-fill section. We simply
225 * leave valid set to 0.
229 if (i != ap->a_reqpage) {
231 * Whether or not to leave the page activated is up in
232 * the air, but we should put the page on a page queue
233 * somewhere (it already is in the object). Result:
234 * It appears that emperical results show that
235 * deactivating pages is best.
239 * Just in case someone was asking for this page we
240 * now tell them that it is ok to use.
243 if (m->oflags & VPO_WANTED)
246 vm_page_deactivate(m);
253 vm_page_unlock_queues();
254 VM_OBJECT_UNLOCK(object);
259 * Vnode op for VM putpages.
262 nfs_putpages(struct vop_putpages_args *ap)
268 int iomode, must_commit, i, error, npages, count;
274 struct nfsmount *nmp;
280 td = curthread; /* XXX */
281 cred = curthread->td_ucred; /* XXX */
282 nmp = VFSTONFS(vp->v_mount);
285 rtvals = ap->a_rtvals;
286 npages = btoc(count);
287 offset = IDX_TO_OFF(pages[0]->pindex);
289 mtx_lock(&nmp->nm_mtx);
290 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
291 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
292 mtx_unlock(&nmp->nm_mtx);
293 (void)nfs_fsinfo(nmp, vp, cred, td);
295 mtx_unlock(&nmp->nm_mtx);
297 mtx_lock(&np->n_mtx);
298 if (nfs_directio_enable && !nfs_directio_allow_mmap &&
299 (np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
300 mtx_unlock(&np->n_mtx);
301 nfs_printf("nfs_putpages: called on noncache-able vnode??\n");
302 mtx_lock(&np->n_mtx);
305 for (i = 0; i < npages; i++)
306 rtvals[i] = VM_PAGER_AGAIN;
309 * When putting pages, do not extend file past EOF.
311 if (offset + count > np->n_size) {
312 count = np->n_size - offset;
316 mtx_unlock(&np->n_mtx);
319 * We use only the kva address for the buffer, but this is extremely
320 * convienient and fast.
322 bp = getpbuf(&nfs_pbuf_freecnt);
324 kva = (vm_offset_t) bp->b_data;
325 pmap_qenter(kva, pages, npages);
327 cnt.v_vnodepgsout += count;
329 iov.iov_base = (caddr_t) kva;
333 uio.uio_offset = offset;
334 uio.uio_resid = count;
335 uio.uio_segflg = UIO_SYSSPACE;
336 uio.uio_rw = UIO_WRITE;
339 if ((ap->a_sync & VM_PAGER_PUT_SYNC) == 0)
340 iomode = NFSV3WRITE_UNSTABLE;
342 iomode = NFSV3WRITE_FILESYNC;
344 error = (nmp->nm_rpcops->nr_writerpc)(vp, &uio, cred, &iomode, &must_commit);
346 pmap_qremove(kva, npages);
347 relpbuf(bp, &nfs_pbuf_freecnt);
350 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
351 for (i = 0; i < nwritten; i++) {
352 rtvals[i] = VM_PAGER_OK;
353 vm_page_undirty(pages[i]);
356 nfs_clearcommit(vp->v_mount);
363 * For nfs, cache consistency can only be maintained approximately.
364 * Although RFC1094 does not specify the criteria, the following is
365 * believed to be compatible with the reference port.
367 * If the file's modify time on the server has changed since the
368 * last read rpc or you have written to the file,
369 * you may have lost data cache consistency with the
370 * server, so flush all of the file's data out of the cache.
371 * Then force a getattr rpc to ensure that you have up to date
373 * NB: This implies that cache data can be read when up to
374 * NFS_ATTRTIMEO seconds out of date. If you find that you need current
375 * attributes this could be forced by setting n_attrstamp to 0 before
376 * the VOP_GETATTR() call.
379 nfs_bioread_check_cons(struct vnode *vp, struct thread *td, struct ucred *cred)
383 struct nfsnode *np = VTONFS(vp);
385 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
388 * Grab the exclusive lock before checking whether the cache is
390 * XXX - We can make this cheaper later (by acquiring cheaper locks).
391 * But for now, this suffices.
393 old_lock = nfs_upgrade_vnlock(vp, td);
394 mtx_lock(&np->n_mtx);
395 if (np->n_flag & NMODIFIED) {
396 mtx_unlock(&np->n_mtx);
397 if (vp->v_type != VREG) {
398 if (vp->v_type != VDIR)
399 panic("nfs: bioread, not dir");
400 (nmp->nm_rpcops->nr_invaldir)(vp);
401 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
406 error = VOP_GETATTR(vp, &vattr, cred, td);
409 mtx_lock(&np->n_mtx);
410 np->n_mtime = vattr.va_mtime;
411 mtx_unlock(&np->n_mtx);
413 mtx_unlock(&np->n_mtx);
414 error = VOP_GETATTR(vp, &vattr, cred, td);
417 mtx_lock(&np->n_mtx);
418 if ((np->n_flag & NSIZECHANGED)
419 || (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime))) {
420 mtx_unlock(&np->n_mtx);
421 if (vp->v_type == VDIR)
422 (nmp->nm_rpcops->nr_invaldir)(vp);
423 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
426 mtx_lock(&np->n_mtx);
427 np->n_mtime = vattr.va_mtime;
428 np->n_flag &= ~NSIZECHANGED;
430 mtx_unlock(&np->n_mtx);
433 nfs_downgrade_vnlock(vp, td, old_lock);
438 * Vnode op for read using bio
441 nfs_bioread(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred)
443 struct nfsnode *np = VTONFS(vp);
445 struct buf *bp, *rabp;
447 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
451 int nra, error = 0, n = 0, on = 0;
454 if (uio->uio_rw != UIO_READ)
455 panic("nfs_read mode");
457 if (uio->uio_resid == 0)
459 if (uio->uio_offset < 0) /* XXX VDIR cookies can be negative */
463 mtx_lock(&nmp->nm_mtx);
464 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
465 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
466 mtx_unlock(&nmp->nm_mtx);
467 (void)nfs_fsinfo(nmp, vp, cred, td);
469 mtx_unlock(&nmp->nm_mtx);
471 if (vp->v_type != VDIR &&
472 (uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
475 if (nfs_directio_enable && (ioflag & IO_DIRECT) && (vp->v_type == VREG))
476 /* No caching/ no readaheads. Just read data into the user buffer */
477 return nfs_readrpc(vp, uio, cred);
479 biosize = vp->v_mount->mnt_stat.f_iosize;
480 seqcount = (int)((off_t)(ioflag >> IO_SEQSHIFT) * biosize / BKVASIZE);
482 error = nfs_bioread_check_cons(vp, td, cred);
489 mtx_lock(&np->n_mtx);
491 mtx_unlock(&np->n_mtx);
493 switch (vp->v_type) {
495 nfsstats.biocache_reads++;
496 lbn = uio->uio_offset / biosize;
497 on = uio->uio_offset & (biosize - 1);
500 * Start the read ahead(s), as required.
502 if (nmp->nm_readahead > 0) {
503 for (nra = 0; nra < nmp->nm_readahead && nra < seqcount &&
504 (off_t)(lbn + 1 + nra) * biosize < nsize; nra++) {
505 rabn = lbn + 1 + nra;
506 if (incore(&vp->v_bufobj, rabn) == NULL) {
507 rabp = nfs_getcacheblk(vp, rabn, biosize, td);
509 error = nfs_sigintr(nmp, NULL, td);
510 return (error ? error : EINTR);
512 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
513 rabp->b_flags |= B_ASYNC;
514 rabp->b_iocmd = BIO_READ;
515 vfs_busy_pages(rabp, 0);
516 if (nfs_asyncio(nmp, rabp, cred, td)) {
517 rabp->b_flags |= B_INVAL;
518 rabp->b_ioflags |= BIO_ERROR;
519 vfs_unbusy_pages(rabp);
530 /* Note that bcount is *not* DEV_BSIZE aligned. */
532 if ((off_t)lbn * biosize >= nsize) {
534 } else if ((off_t)(lbn + 1) * biosize > nsize) {
535 bcount = nsize - (off_t)lbn * biosize;
537 bp = nfs_getcacheblk(vp, lbn, bcount, td);
540 error = nfs_sigintr(nmp, NULL, td);
541 return (error ? error : EINTR);
545 * If B_CACHE is not set, we must issue the read. If this
546 * fails, we return an error.
549 if ((bp->b_flags & B_CACHE) == 0) {
550 bp->b_iocmd = BIO_READ;
551 vfs_busy_pages(bp, 0);
552 error = nfs_doio(vp, bp, cred, td);
560 * on is the offset into the current bp. Figure out how many
561 * bytes we can copy out of the bp. Note that bcount is
562 * NOT DEV_BSIZE aligned.
564 * Then figure out how many bytes we can copy into the uio.
569 n = min((unsigned)(bcount - on), uio->uio_resid);
572 nfsstats.biocache_readlinks++;
573 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, td);
575 error = nfs_sigintr(nmp, NULL, td);
576 return (error ? error : EINTR);
578 if ((bp->b_flags & B_CACHE) == 0) {
579 bp->b_iocmd = BIO_READ;
580 vfs_busy_pages(bp, 0);
581 error = nfs_doio(vp, bp, cred, td);
583 bp->b_ioflags |= BIO_ERROR;
588 n = min(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
592 nfsstats.biocache_readdirs++;
593 if (np->n_direofoffset
594 && uio->uio_offset >= np->n_direofoffset) {
597 lbn = (uoff_t)uio->uio_offset / NFS_DIRBLKSIZ;
598 on = uio->uio_offset & (NFS_DIRBLKSIZ - 1);
599 bp = nfs_getcacheblk(vp, lbn, NFS_DIRBLKSIZ, td);
601 error = nfs_sigintr(nmp, NULL, td);
602 return (error ? error : EINTR);
604 if ((bp->b_flags & B_CACHE) == 0) {
605 bp->b_iocmd = BIO_READ;
606 vfs_busy_pages(bp, 0);
607 error = nfs_doio(vp, bp, cred, td);
611 while (error == NFSERR_BAD_COOKIE) {
612 (nmp->nm_rpcops->nr_invaldir)(vp);
613 error = nfs_vinvalbuf(vp, 0, td, 1);
615 * Yuck! The directory has been modified on the
616 * server. The only way to get the block is by
617 * reading from the beginning to get all the
620 * Leave the last bp intact unless there is an error.
621 * Loop back up to the while if the error is another
622 * NFSERR_BAD_COOKIE (double yuch!).
624 for (i = 0; i <= lbn && !error; i++) {
625 if (np->n_direofoffset
626 && (i * NFS_DIRBLKSIZ) >= np->n_direofoffset)
628 bp = nfs_getcacheblk(vp, i, NFS_DIRBLKSIZ, td);
630 error = nfs_sigintr(nmp, NULL, td);
631 return (error ? error : EINTR);
633 if ((bp->b_flags & B_CACHE) == 0) {
634 bp->b_iocmd = BIO_READ;
635 vfs_busy_pages(bp, 0);
636 error = nfs_doio(vp, bp, cred, td);
638 * no error + B_INVAL == directory EOF,
641 if (error == 0 && (bp->b_flags & B_INVAL))
645 * An error will throw away the block and the
646 * for loop will break out. If no error and this
647 * is not the block we want, we throw away the
648 * block and go for the next one via the for loop.
650 if (error || i < lbn)
655 * The above while is repeated if we hit another cookie
656 * error. If we hit an error and it wasn't a cookie error,
664 * If not eof and read aheads are enabled, start one.
665 * (You need the current block first, so that you have the
666 * directory offset cookie of the next block.)
668 if (nmp->nm_readahead > 0 &&
669 (bp->b_flags & B_INVAL) == 0 &&
670 (np->n_direofoffset == 0 ||
671 (lbn + 1) * NFS_DIRBLKSIZ < np->n_direofoffset) &&
672 incore(&vp->v_bufobj, lbn + 1) == NULL) {
673 rabp = nfs_getcacheblk(vp, lbn + 1, NFS_DIRBLKSIZ, td);
675 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
676 rabp->b_flags |= B_ASYNC;
677 rabp->b_iocmd = BIO_READ;
678 vfs_busy_pages(rabp, 0);
679 if (nfs_asyncio(nmp, rabp, cred, td)) {
680 rabp->b_flags |= B_INVAL;
681 rabp->b_ioflags |= BIO_ERROR;
682 vfs_unbusy_pages(rabp);
691 * Unlike VREG files, whos buffer size ( bp->b_bcount ) is
692 * chopped for the EOF condition, we cannot tell how large
693 * NFS directories are going to be until we hit EOF. So
694 * an NFS directory buffer is *not* chopped to its EOF. Now,
695 * it just so happens that b_resid will effectively chop it
696 * to EOF. *BUT* this information is lost if the buffer goes
697 * away and is reconstituted into a B_CACHE state ( due to
698 * being VMIO ) later. So we keep track of the directory eof
699 * in np->n_direofoffset and chop it off as an extra step
702 n = lmin(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid - on);
703 if (np->n_direofoffset && n > np->n_direofoffset - uio->uio_offset)
704 n = np->n_direofoffset - uio->uio_offset;
707 nfs_printf(" nfs_bioread: type %x unexpected\n", vp->v_type);
713 error = uiomove(bp->b_data + on, (int)n, uio);
715 if (vp->v_type == VLNK)
719 } while (error == 0 && uio->uio_resid > 0 && n > 0);
724 * The NFS write path cannot handle iovecs with len > 1. So we need to
725 * break up iovecs accordingly (restricting them to wsize).
726 * For the SYNC case, we can do this with 1 copy (user buffer -> mbuf).
727 * For the ASYNC case, 2 copies are needed. The first a copy from the
728 * user buffer to a staging buffer and then a second copy from the staging
729 * buffer to mbufs. This can be optimized by copying from the user buffer
730 * directly into mbufs and passing the chain down, but that requires a
731 * fair amount of re-working of the relevant codepaths (and can be done
735 nfs_directio_write(vp, uiop, cred, ioflag)
742 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
743 struct thread *td = uiop->uio_td;
747 mtx_lock(&nmp->nm_mtx);
748 wsize = nmp->nm_wsize;
749 mtx_unlock(&nmp->nm_mtx);
750 if (ioflag & IO_SYNC) {
751 int iomode, must_commit;
755 while (uiop->uio_resid > 0) {
756 size = min(uiop->uio_resid, wsize);
757 size = min(uiop->uio_iov->iov_len, size);
758 iov.iov_base = uiop->uio_iov->iov_base;
762 uio.uio_offset = uiop->uio_offset;
763 uio.uio_resid = size;
764 uio.uio_segflg = UIO_USERSPACE;
765 uio.uio_rw = UIO_WRITE;
767 iomode = NFSV3WRITE_FILESYNC;
768 error = (nmp->nm_rpcops->nr_writerpc)(vp, &uio, cred,
769 &iomode, &must_commit);
770 KASSERT((must_commit == 0),
771 ("nfs_directio_write: Did not commit write"));
774 uiop->uio_offset += size;
775 uiop->uio_resid -= size;
776 if (uiop->uio_iov->iov_len <= size) {
780 uiop->uio_iov->iov_base =
781 (char *)uiop->uio_iov->iov_base + size;
782 uiop->uio_iov->iov_len -= size;
791 * Break up the write into blocksize chunks and hand these
792 * over to nfsiod's for write back.
793 * Unfortunately, this incurs a copy of the data. Since
794 * the user could modify the buffer before the write is
797 * The obvious optimization here is that one of the 2 copies
798 * in the async write path can be eliminated by copying the
799 * data here directly into mbufs and passing the mbuf chain
800 * down. But that will require a fair amount of re-working
801 * of the code and can be done if there's enough interest
802 * in NFS directio access.
804 while (uiop->uio_resid > 0) {
805 size = min(uiop->uio_resid, wsize);
806 size = min(uiop->uio_iov->iov_len, size);
807 bp = getpbuf(&nfs_pbuf_freecnt);
808 t_uio = malloc(sizeof(struct uio), M_NFSDIRECTIO, M_WAITOK);
809 t_iov = malloc(sizeof(struct iovec), M_NFSDIRECTIO, M_WAITOK);
810 t_iov->iov_base = malloc(size, M_NFSDIRECTIO, M_WAITOK);
811 t_iov->iov_len = size;
812 t_uio->uio_iov = t_iov;
813 t_uio->uio_iovcnt = 1;
814 t_uio->uio_offset = uiop->uio_offset;
815 t_uio->uio_resid = size;
816 t_uio->uio_segflg = UIO_SYSSPACE;
817 t_uio->uio_rw = UIO_WRITE;
819 bcopy(uiop->uio_iov->iov_base, t_iov->iov_base, size);
820 bp->b_flags |= B_DIRECT;
821 bp->b_iocmd = BIO_WRITE;
822 if (cred != NOCRED) {
826 bp->b_wcred = NOCRED;
827 bp->b_caller1 = (void *)t_uio;
830 error = nfs_asyncio(nmp, bp, NOCRED, td);
832 free(t_iov->iov_base, M_NFSDIRECTIO);
833 free(t_iov, M_NFSDIRECTIO);
834 free(t_uio, M_NFSDIRECTIO);
837 relpbuf(bp, &nfs_pbuf_freecnt);
842 uiop->uio_offset += size;
843 uiop->uio_resid -= size;
844 if (uiop->uio_iov->iov_len <= size) {
848 uiop->uio_iov->iov_base =
849 (char *)uiop->uio_iov->iov_base + size;
850 uiop->uio_iov->iov_len -= size;
858 * Vnode op for write using bio
861 nfs_write(struct vop_write_args *ap)
864 struct uio *uio = ap->a_uio;
865 struct thread *td = uio->uio_td;
866 struct vnode *vp = ap->a_vp;
867 struct nfsnode *np = VTONFS(vp);
868 struct ucred *cred = ap->a_cred;
869 int ioflag = ap->a_ioflag;
872 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
875 int n, on, error = 0;
876 struct proc *p = td?td->td_proc:NULL;
879 if (uio->uio_rw != UIO_WRITE)
880 panic("nfs_write mode");
881 if (uio->uio_segflg == UIO_USERSPACE && uio->uio_td != curthread)
882 panic("nfs_write proc");
884 if (vp->v_type != VREG)
886 mtx_lock(&np->n_mtx);
887 if (np->n_flag & NWRITEERR) {
888 np->n_flag &= ~NWRITEERR;
889 mtx_unlock(&np->n_mtx);
890 return (np->n_error);
892 mtx_unlock(&np->n_mtx);
893 mtx_lock(&nmp->nm_mtx);
894 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
895 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
896 mtx_unlock(&nmp->nm_mtx);
897 (void)nfs_fsinfo(nmp, vp, cred, td);
899 mtx_unlock(&nmp->nm_mtx);
902 * Synchronously flush pending buffers if we are in synchronous
903 * mode or if we are appending.
905 if (ioflag & (IO_APPEND | IO_SYNC)) {
906 mtx_lock(&np->n_mtx);
907 if (np->n_flag & NMODIFIED) {
908 mtx_unlock(&np->n_mtx);
909 #ifdef notyet /* Needs matching nonblock semantics elsewhere, too. */
911 * Require non-blocking, synchronous writes to
912 * dirty files to inform the program it needs
913 * to fsync(2) explicitly.
915 if (ioflag & IO_NDELAY)
920 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
924 mtx_unlock(&np->n_mtx);
928 * If IO_APPEND then load uio_offset. We restart here if we cannot
929 * get the append lock.
931 if (ioflag & IO_APPEND) {
933 error = VOP_GETATTR(vp, &vattr, cred, td);
936 mtx_lock(&np->n_mtx);
937 uio->uio_offset = np->n_size;
938 mtx_unlock(&np->n_mtx);
941 if (uio->uio_offset < 0)
943 if ((uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
945 if (uio->uio_resid == 0)
948 if (nfs_directio_enable && (ioflag & IO_DIRECT) && vp->v_type == VREG)
949 return nfs_directio_write(vp, uio, cred, ioflag);
952 * Maybe this should be above the vnode op call, but so long as
953 * file servers have no limits, i don't think it matters
957 if (uio->uio_offset + uio->uio_resid >
958 lim_cur(p, RLIMIT_FSIZE)) {
966 biosize = vp->v_mount->mnt_stat.f_iosize;
968 * Find all of this file's B_NEEDCOMMIT buffers. If our writes
969 * would exceed the local maximum per-file write commit size when
970 * combined with those, we must decide whether to flush,
971 * go synchronous, or return error. We don't bother checking
972 * IO_UNIT -- we just make all writes atomic anyway, as there's
973 * no point optimizing for something that really won't ever happen.
975 if (!(ioflag & IO_SYNC)) {
978 mtx_lock(&np->n_mtx);
980 mtx_unlock(&np->n_mtx);
982 if (nmp->nm_wcommitsize < uio->uio_resid) {
984 * If this request could not possibly be completed
985 * without exceeding the maximum outstanding write
986 * commit size, see if we can convert it into a
987 * synchronous write operation.
989 if (ioflag & IO_NDELAY)
992 if (nflag & NMODIFIED)
994 } else if (nflag & NMODIFIED) {
996 BO_LOCK(&vp->v_bufobj);
997 if (vp->v_bufobj.bo_dirty.bv_cnt != 0) {
998 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd,
1000 if (bp->b_flags & B_NEEDCOMMIT)
1001 wouldcommit += bp->b_bcount;
1004 BO_UNLOCK(&vp->v_bufobj);
1006 * Since we're not operating synchronously and
1007 * bypassing the buffer cache, we are in a commit
1008 * and holding all of these buffers whether
1009 * transmitted or not. If not limited, this
1010 * will lead to the buffer cache deadlocking,
1011 * as no one else can flush our uncommitted buffers.
1013 wouldcommit += uio->uio_resid;
1015 * If we would initially exceed the maximum
1016 * outstanding write commit size, flush and restart.
1018 if (wouldcommit > nmp->nm_wcommitsize)
1022 goto flush_and_restart;
1026 nfsstats.biocache_writes++;
1027 lbn = uio->uio_offset / biosize;
1028 on = uio->uio_offset & (biosize-1);
1029 n = min((unsigned)(biosize - on), uio->uio_resid);
1032 * Handle direct append and file extension cases, calculate
1033 * unaligned buffer size.
1035 mtx_lock(&np->n_mtx);
1036 if (uio->uio_offset == np->n_size && n) {
1037 mtx_unlock(&np->n_mtx);
1039 * Get the buffer (in its pre-append state to maintain
1040 * B_CACHE if it was previously set). Resize the
1041 * nfsnode after we have locked the buffer to prevent
1042 * readers from reading garbage.
1045 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1050 mtx_lock(&np->n_mtx);
1051 np->n_size = uio->uio_offset + n;
1052 np->n_flag |= NMODIFIED;
1053 vnode_pager_setsize(vp, np->n_size);
1054 mtx_unlock(&np->n_mtx);
1056 save = bp->b_flags & B_CACHE;
1058 allocbuf(bp, bcount);
1059 bp->b_flags |= save;
1063 * Obtain the locked cache block first, and then
1064 * adjust the file's size as appropriate.
1067 if ((off_t)lbn * biosize + bcount < np->n_size) {
1068 if ((off_t)(lbn + 1) * biosize < np->n_size)
1071 bcount = np->n_size - (off_t)lbn * biosize;
1073 mtx_unlock(&np->n_mtx);
1074 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1075 mtx_lock(&np->n_mtx);
1076 if (uio->uio_offset + n > np->n_size) {
1077 np->n_size = uio->uio_offset + n;
1078 np->n_flag |= NMODIFIED;
1079 vnode_pager_setsize(vp, np->n_size);
1081 mtx_unlock(&np->n_mtx);
1085 error = nfs_sigintr(nmp, NULL, td);
1092 * Issue a READ if B_CACHE is not set. In special-append
1093 * mode, B_CACHE is based on the buffer prior to the write
1094 * op and is typically set, avoiding the read. If a read
1095 * is required in special append mode, the server will
1096 * probably send us a short-read since we extended the file
1097 * on our end, resulting in b_resid == 0 and, thusly,
1098 * B_CACHE getting set.
1100 * We can also avoid issuing the read if the write covers
1101 * the entire buffer. We have to make sure the buffer state
1102 * is reasonable in this case since we will not be initiating
1103 * I/O. See the comments in kern/vfs_bio.c's getblk() for
1106 * B_CACHE may also be set due to the buffer being cached
1110 if (on == 0 && n == bcount) {
1111 bp->b_flags |= B_CACHE;
1112 bp->b_flags &= ~B_INVAL;
1113 bp->b_ioflags &= ~BIO_ERROR;
1116 if ((bp->b_flags & B_CACHE) == 0) {
1117 bp->b_iocmd = BIO_READ;
1118 vfs_busy_pages(bp, 0);
1119 error = nfs_doio(vp, bp, cred, td);
1125 if (bp->b_wcred == NOCRED)
1126 bp->b_wcred = crhold(cred);
1127 mtx_lock(&np->n_mtx);
1128 np->n_flag |= NMODIFIED;
1129 mtx_unlock(&np->n_mtx);
1132 * If dirtyend exceeds file size, chop it down. This should
1133 * not normally occur but there is an append race where it
1134 * might occur XXX, so we log it.
1136 * If the chopping creates a reverse-indexed or degenerate
1137 * situation with dirtyoff/end, we 0 both of them.
1140 if (bp->b_dirtyend > bcount) {
1141 nfs_printf("NFS append race @%lx:%d\n",
1142 (long)bp->b_blkno * DEV_BSIZE,
1143 bp->b_dirtyend - bcount);
1144 bp->b_dirtyend = bcount;
1147 if (bp->b_dirtyoff >= bp->b_dirtyend)
1148 bp->b_dirtyoff = bp->b_dirtyend = 0;
1151 * If the new write will leave a contiguous dirty
1152 * area, just update the b_dirtyoff and b_dirtyend,
1153 * otherwise force a write rpc of the old dirty area.
1155 * While it is possible to merge discontiguous writes due to
1156 * our having a B_CACHE buffer ( and thus valid read data
1157 * for the hole), we don't because it could lead to
1158 * significant cache coherency problems with multiple clients,
1159 * especially if locking is implemented later on.
1161 * as an optimization we could theoretically maintain
1162 * a linked list of discontinuous areas, but we would still
1163 * have to commit them separately so there isn't much
1164 * advantage to it except perhaps a bit of asynchronization.
1167 if (bp->b_dirtyend > 0 &&
1168 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
1169 if (bwrite(bp) == EINTR) {
1176 error = uiomove((char *)bp->b_data + on, n, uio);
1179 * Since this block is being modified, it must be written
1180 * again and not just committed. Since write clustering does
1181 * not work for the stage 1 data write, only the stage 2
1182 * commit rpc, we have to clear B_CLUSTEROK as well.
1184 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1187 bp->b_ioflags |= BIO_ERROR;
1193 * Only update dirtyoff/dirtyend if not a degenerate
1197 if (bp->b_dirtyend > 0) {
1198 bp->b_dirtyoff = min(on, bp->b_dirtyoff);
1199 bp->b_dirtyend = max((on + n), bp->b_dirtyend);
1201 bp->b_dirtyoff = on;
1202 bp->b_dirtyend = on + n;
1204 vfs_bio_set_validclean(bp, on, n);
1208 * If IO_SYNC do bwrite().
1210 * IO_INVAL appears to be unused. The idea appears to be
1211 * to turn off caching in this case. Very odd. XXX
1213 if ((ioflag & IO_SYNC)) {
1214 if (ioflag & IO_INVAL)
1215 bp->b_flags |= B_NOCACHE;
1219 } else if ((n + on) == biosize) {
1220 bp->b_flags |= B_ASYNC;
1221 (void) (nmp->nm_rpcops->nr_writebp)(bp, 0, NULL);
1225 } while (uio->uio_resid > 0 && n > 0);
1231 * Get an nfs cache block.
1233 * Allocate a new one if the block isn't currently in the cache
1234 * and return the block marked busy. If the calling process is
1235 * interrupted by a signal for an interruptible mount point, return
1238 * The caller must carefully deal with the possible B_INVAL state of
1239 * the buffer. nfs_doio() clears B_INVAL (and nfs_asyncio() clears it
1240 * indirectly), so synchronous reads can be issued without worrying about
1241 * the B_INVAL state. We have to be a little more careful when dealing
1242 * with writes (see comments in nfs_write()) when extending a file past
1246 nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct thread *td)
1250 struct nfsmount *nmp;
1255 if (nmp->nm_flag & NFSMNT_INT) {
1258 nfs_set_sigmask(td, &oldset);
1259 bp = getblk(vp, bn, size, PCATCH, 0, 0);
1260 nfs_restore_sigmask(td, &oldset);
1261 while (bp == NULL) {
1262 if (nfs_sigintr(nmp, NULL, td))
1264 bp = getblk(vp, bn, size, 0, 2 * hz, 0);
1267 bp = getblk(vp, bn, size, 0, 0, 0);
1270 if (vp->v_type == VREG) {
1273 biosize = mp->mnt_stat.f_iosize;
1274 bp->b_blkno = bn * (biosize / DEV_BSIZE);
1280 * Flush and invalidate all dirty buffers. If another process is already
1281 * doing the flush, just wait for completion.
1284 nfs_vinvalbuf(struct vnode *vp, int flags, struct thread *td, int intrflg)
1286 struct nfsnode *np = VTONFS(vp);
1287 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1288 int error = 0, slpflag, slptimeo;
1291 ASSERT_VOP_LOCKED(vp, "nfs_vinvalbuf");
1294 * XXX This check stops us from needlessly doing a vinvalbuf when
1295 * being called through vclean(). It is not clear that this is
1298 if (vp->v_iflag & VI_DOOMED)
1301 if ((nmp->nm_flag & NFSMNT_INT) == 0)
1311 old_lock = nfs_upgrade_vnlock(vp, td);
1313 * Now, flush as required.
1315 if ((flags & V_SAVE) && (vp->v_bufobj.bo_object != NULL)) {
1316 VM_OBJECT_LOCK(vp->v_bufobj.bo_object);
1317 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
1318 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object);
1320 * If the page clean was interrupted, fail the invalidation.
1321 * Not doing so, we run the risk of losing dirty pages in the
1322 * vinvalbuf() call below.
1324 if (intrflg && (error = nfs_sigintr(nmp, NULL, td)))
1328 error = vinvalbuf(vp, flags, td, slpflag, 0);
1330 if (intrflg && (error = nfs_sigintr(nmp, NULL, td)))
1332 error = vinvalbuf(vp, flags, td, 0, slptimeo);
1334 mtx_lock(&np->n_mtx);
1335 if (np->n_directio_asyncwr == 0)
1336 np->n_flag &= ~NMODIFIED;
1337 mtx_unlock(&np->n_mtx);
1339 nfs_downgrade_vnlock(vp, td, old_lock);
1344 * Initiate asynchronous I/O. Return an error if no nfsiods are available.
1345 * This is mainly to avoid queueing async I/O requests when the nfsiods
1346 * are all hung on a dead server.
1348 * Note: nfs_asyncio() does not clear (BIO_ERROR|B_INVAL) but when the bp
1349 * is eventually dequeued by the async daemon, nfs_doio() *will*.
1352 nfs_asyncio(struct nfsmount *nmp, struct buf *bp, struct ucred *cred, struct thread *td)
1361 * Commits are usually short and sweet so lets save some cpu and
1362 * leave the async daemons for more important rpc's (such as reads
1365 mtx_lock(&nfs_iod_mtx);
1366 if (bp->b_iocmd == BIO_WRITE && (bp->b_flags & B_NEEDCOMMIT) &&
1367 (nmp->nm_bufqiods > nfs_numasync / 2)) {
1368 mtx_unlock(&nfs_iod_mtx);
1372 if (nmp->nm_flag & NFSMNT_INT)
1377 * Find a free iod to process this request.
1379 for (iod = 0; iod < nfs_numasync; iod++)
1380 if (nfs_iodwant[iod]) {
1386 * Try to create one if none are free.
1389 iod = nfs_nfsiodnew();
1396 * Found one, so wake it up and tell it which
1399 NFS_DPF(ASYNCIO, ("nfs_asyncio: waking iod %d for mount %p\n",
1401 nfs_iodwant[iod] = NULL;
1402 nfs_iodmount[iod] = nmp;
1404 wakeup(&nfs_iodwant[iod]);
1408 * If none are free, we may already have an iod working on this mount
1409 * point. If so, it will process our request.
1412 if (nmp->nm_bufqiods > 0) {
1414 ("nfs_asyncio: %d iods are already processing mount %p\n",
1415 nmp->nm_bufqiods, nmp));
1421 * If we have an iod which can process the request, then queue
1426 * Ensure that the queue never grows too large. We still want
1427 * to asynchronize so we block rather then return EIO.
1429 while (nmp->nm_bufqlen >= 2*nfs_numasync) {
1431 ("nfs_asyncio: waiting for mount %p queue to drain\n", nmp));
1432 nmp->nm_bufqwant = TRUE;
1433 error = nfs_msleep(td, &nmp->nm_bufq, &nfs_iod_mtx,
1435 "nfsaio", slptimeo);
1437 error2 = nfs_sigintr(nmp, NULL, td);
1439 mtx_unlock(&nfs_iod_mtx);
1442 if (slpflag == PCATCH) {
1448 * We might have lost our iod while sleeping,
1449 * so check and loop if nescessary.
1451 if (nmp->nm_bufqiods == 0) {
1453 ("nfs_asyncio: no iods after mount %p queue was drained, looping\n", nmp));
1458 if (bp->b_iocmd == BIO_READ) {
1459 if (bp->b_rcred == NOCRED && cred != NOCRED)
1460 bp->b_rcred = crhold(cred);
1462 if (bp->b_wcred == NOCRED && cred != NOCRED)
1463 bp->b_wcred = crhold(cred);
1466 if (bp->b_flags & B_REMFREE)
1469 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist);
1471 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1472 mtx_lock(&(VTONFS(bp->b_vp))->n_mtx);
1473 VTONFS(bp->b_vp)->n_directio_asyncwr++;
1474 mtx_unlock(&(VTONFS(bp->b_vp))->n_mtx);
1476 mtx_unlock(&nfs_iod_mtx);
1480 mtx_unlock(&nfs_iod_mtx);
1483 * All the iods are busy on other mounts, so return EIO to
1484 * force the caller to process the i/o synchronously.
1486 NFS_DPF(ASYNCIO, ("nfs_asyncio: no iods available, i/o is synchronous\n"));
1491 nfs_doio_directwrite(struct buf *bp)
1493 int iomode, must_commit;
1494 struct uio *uiop = (struct uio *)bp->b_caller1;
1495 char *iov_base = uiop->uio_iov->iov_base;
1496 struct nfsmount *nmp = VFSTONFS(bp->b_vp->v_mount);
1498 iomode = NFSV3WRITE_FILESYNC;
1499 uiop->uio_td = NULL; /* NULL since we're in nfsiod */
1500 (nmp->nm_rpcops->nr_writerpc)(bp->b_vp, uiop, bp->b_wcred, &iomode, &must_commit);
1501 KASSERT((must_commit == 0), ("nfs_doio_directwrite: Did not commit write"));
1502 free(iov_base, M_NFSDIRECTIO);
1503 free(uiop->uio_iov, M_NFSDIRECTIO);
1504 free(uiop, M_NFSDIRECTIO);
1505 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1506 struct nfsnode *np = VTONFS(bp->b_vp);
1507 mtx_lock(&np->n_mtx);
1508 np->n_directio_asyncwr--;
1509 if ((np->n_flag & NFSYNCWAIT) && np->n_directio_asyncwr == 0) {
1510 np->n_flag &= ~NFSYNCWAIT;
1511 wakeup((caddr_t)&np->n_directio_asyncwr);
1513 mtx_unlock(&np->n_mtx);
1517 relpbuf(bp, &nfs_pbuf_freecnt);
1521 * Do an I/O operation to/from a cache block. This may be called
1522 * synchronously or from an nfsiod.
1525 nfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td)
1529 struct nfsmount *nmp;
1530 int error = 0, iomode, must_commit = 0;
1533 struct proc *p = td ? td->td_proc : NULL;
1537 nmp = VFSTONFS(vp->v_mount);
1539 uiop->uio_iov = &io;
1540 uiop->uio_iovcnt = 1;
1541 uiop->uio_segflg = UIO_SYSSPACE;
1545 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
1546 * do this here so we do not have to do it in all the code that
1549 bp->b_flags &= ~B_INVAL;
1550 bp->b_ioflags &= ~BIO_ERROR;
1552 KASSERT(!(bp->b_flags & B_DONE), ("nfs_doio: bp %p already marked done", bp));
1553 iocmd = bp->b_iocmd;
1554 if (iocmd == BIO_READ) {
1555 io.iov_len = uiop->uio_resid = bp->b_bcount;
1556 io.iov_base = bp->b_data;
1557 uiop->uio_rw = UIO_READ;
1559 switch (vp->v_type) {
1561 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
1562 nfsstats.read_bios++;
1563 error = (nmp->nm_rpcops->nr_readrpc)(vp, uiop, cr);
1566 if (uiop->uio_resid) {
1568 * If we had a short read with no error, we must have
1569 * hit a file hole. We should zero-fill the remainder.
1570 * This can also occur if the server hits the file EOF.
1572 * Holes used to be able to occur due to pending
1573 * writes, but that is not possible any longer.
1575 int nread = bp->b_bcount - uiop->uio_resid;
1576 int left = uiop->uio_resid;
1579 bzero((char *)bp->b_data + nread, left);
1580 uiop->uio_resid = 0;
1583 /* ASSERT_VOP_LOCKED(vp, "nfs_doio"); */
1584 if (p && (vp->v_vflag & VV_TEXT)) {
1585 mtx_lock(&np->n_mtx);
1586 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &np->n_vattr.va_mtime)) {
1587 mtx_unlock(&np->n_mtx);
1589 killproc(p, "text file modification");
1592 mtx_unlock(&np->n_mtx);
1596 uiop->uio_offset = (off_t)0;
1597 nfsstats.readlink_bios++;
1598 error = (nmp->nm_rpcops->nr_readlinkrpc)(vp, uiop, cr);
1601 nfsstats.readdir_bios++;
1602 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
1603 if ((nmp->nm_flag & NFSMNT_NFSV4) != 0)
1604 error = nfs4_readdirrpc(vp, uiop, cr);
1606 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) != 0) {
1607 error = nfs_readdirplusrpc(vp, uiop, cr);
1608 if (error == NFSERR_NOTSUPP)
1609 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
1611 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
1612 error = nfs_readdirrpc(vp, uiop, cr);
1615 * end-of-directory sets B_INVAL but does not generate an
1618 if (error == 0 && uiop->uio_resid == bp->b_bcount)
1619 bp->b_flags |= B_INVAL;
1622 nfs_printf("nfs_doio: type %x unexpected\n", vp->v_type);
1626 bp->b_ioflags |= BIO_ERROR;
1627 bp->b_error = error;
1631 * If we only need to commit, try to commit
1633 if (bp->b_flags & B_NEEDCOMMIT) {
1637 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
1638 retv = (nmp->nm_rpcops->nr_commit)(
1639 vp, off, bp->b_dirtyend-bp->b_dirtyoff,
1642 bp->b_dirtyoff = bp->b_dirtyend = 0;
1643 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1648 if (retv == NFSERR_STALEWRITEVERF) {
1649 nfs_clearcommit(vp->v_mount);
1654 * Setup for actual write
1656 mtx_lock(&np->n_mtx);
1657 if ((off_t)bp->b_blkno * DEV_BSIZE + bp->b_dirtyend > np->n_size)
1658 bp->b_dirtyend = np->n_size - (off_t)bp->b_blkno * DEV_BSIZE;
1659 mtx_unlock(&np->n_mtx);
1661 if (bp->b_dirtyend > bp->b_dirtyoff) {
1662 io.iov_len = uiop->uio_resid = bp->b_dirtyend
1664 uiop->uio_offset = (off_t)bp->b_blkno * DEV_BSIZE
1666 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
1667 uiop->uio_rw = UIO_WRITE;
1668 nfsstats.write_bios++;
1670 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC)
1671 iomode = NFSV3WRITE_UNSTABLE;
1673 iomode = NFSV3WRITE_FILESYNC;
1675 error = (nmp->nm_rpcops->nr_writerpc)(vp, uiop, cr, &iomode, &must_commit);
1678 * When setting B_NEEDCOMMIT also set B_CLUSTEROK to try
1679 * to cluster the buffers needing commit. This will allow
1680 * the system to submit a single commit rpc for the whole
1681 * cluster. We can do this even if the buffer is not 100%
1682 * dirty (relative to the NFS blocksize), so we optimize the
1683 * append-to-file-case.
1685 * (when clearing B_NEEDCOMMIT, B_CLUSTEROK must also be
1686 * cleared because write clustering only works for commit
1687 * rpc's, not for the data portion of the write).
1690 if (!error && iomode == NFSV3WRITE_UNSTABLE) {
1691 bp->b_flags |= B_NEEDCOMMIT;
1692 if (bp->b_dirtyoff == 0
1693 && bp->b_dirtyend == bp->b_bcount)
1694 bp->b_flags |= B_CLUSTEROK;
1696 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1700 * For an interrupted write, the buffer is still valid
1701 * and the write hasn't been pushed to the server yet,
1702 * so we can't set BIO_ERROR and report the interruption
1703 * by setting B_EINTR. For the B_ASYNC case, B_EINTR
1704 * is not relevant, so the rpc attempt is essentially
1705 * a noop. For the case of a V3 write rpc not being
1706 * committed to stable storage, the block is still
1707 * dirty and requires either a commit rpc or another
1708 * write rpc with iomode == NFSV3WRITE_FILESYNC before
1709 * the block is reused. This is indicated by setting
1710 * the B_DELWRI and B_NEEDCOMMIT flags.
1712 * If the buffer is marked B_PAGING, it does not reside on
1713 * the vp's paging queues so we cannot call bdirty(). The
1714 * bp in this case is not an NFS cache block so we should
1717 if (error == EINTR || error == EIO || error == ETIMEDOUT
1718 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
1722 bp->b_flags &= ~(B_INVAL|B_NOCACHE);
1723 if ((bp->b_flags & B_PAGING) == 0) {
1725 bp->b_flags &= ~B_DONE;
1727 if (error && (bp->b_flags & B_ASYNC) == 0)
1728 bp->b_flags |= B_EINTR;
1732 bp->b_ioflags |= BIO_ERROR;
1733 bp->b_error = np->n_error = error;
1734 mtx_lock(&np->n_mtx);
1735 np->n_flag |= NWRITEERR;
1736 mtx_unlock(&np->n_mtx);
1738 bp->b_dirtyoff = bp->b_dirtyend = 0;
1746 bp->b_resid = uiop->uio_resid;
1748 nfs_clearcommit(vp->v_mount);
1754 * Used to aid in handling ftruncate() operations on the NFS client side.
1755 * Truncation creates a number of special problems for NFS. We have to
1756 * throw away VM pages and buffer cache buffers that are beyond EOF, and
1757 * we have to properly handle VM pages or (potentially dirty) buffers
1758 * that straddle the truncation point.
1762 nfs_meta_setsize(struct vnode *vp, struct ucred *cred, struct thread *td, u_quad_t nsize)
1764 struct nfsnode *np = VTONFS(vp);
1766 int biosize = vp->v_mount->mnt_stat.f_iosize;
1769 mtx_lock(&np->n_mtx);
1772 mtx_unlock(&np->n_mtx);
1774 if (nsize < tsize) {
1780 * vtruncbuf() doesn't get the buffer overlapping the
1781 * truncation point. We may have a B_DELWRI and/or B_CACHE
1782 * buffer that now needs to be truncated.
1784 error = vtruncbuf(vp, cred, td, nsize, biosize);
1785 lbn = nsize / biosize;
1786 bufsize = nsize & (biosize - 1);
1787 bp = nfs_getcacheblk(vp, lbn, bufsize, td);
1790 if (bp->b_dirtyoff > bp->b_bcount)
1791 bp->b_dirtyoff = bp->b_bcount;
1792 if (bp->b_dirtyend > bp->b_bcount)
1793 bp->b_dirtyend = bp->b_bcount;
1794 bp->b_flags |= B_RELBUF; /* don't leave garbage around */
1797 vnode_pager_setsize(vp, nsize);