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 "opt_kdtrace.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
44 #include <sys/kernel.h>
46 #include <sys/mount.h>
48 #include <sys/vmmeter.h>
49 #include <sys/vnode.h>
52 #include <vm/vm_extern.h>
53 #include <vm/vm_page.h>
54 #include <vm/vm_object.h>
55 #include <vm/vm_pager.h>
56 #include <vm/vnode_pager.h>
58 #include <nfs/nfsproto.h>
59 #include <nfsclient/nfs.h>
60 #include <nfsclient/nfsmount.h>
61 #include <nfsclient/nfsnode.h>
62 #include <nfsclient/nfs_kdtrace.h>
64 static struct buf *nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size,
66 static int nfs_directio_write(struct vnode *vp, struct uio *uiop,
67 struct ucred *cred, int ioflag);
69 extern int nfs_directio_enable;
70 extern int nfs_directio_allow_mmap;
73 * Vnode op for VM getpages.
76 nfs_getpages(struct vop_getpages_args *ap)
78 int i, error, nextoff, size, toff, count, npages;
93 td = curthread; /* XXX */
94 cred = curthread->td_ucred; /* XXX */
95 nmp = VFSTONFS(vp->v_mount);
99 if ((object = vp->v_object) == NULL) {
100 nfs_printf("nfs_getpages: called with non-merged cache vnode??\n");
101 return (VM_PAGER_ERROR);
104 if (nfs_directio_enable && !nfs_directio_allow_mmap) {
105 mtx_lock(&np->n_mtx);
106 if ((np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
107 mtx_unlock(&np->n_mtx);
108 nfs_printf("nfs_getpages: called on non-cacheable vnode??\n");
109 return (VM_PAGER_ERROR);
111 mtx_unlock(&np->n_mtx);
114 mtx_lock(&nmp->nm_mtx);
115 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
116 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
117 mtx_unlock(&nmp->nm_mtx);
118 /* We'll never get here for v4, because we always have fsinfo */
119 (void)nfs_fsinfo(nmp, vp, cred, td);
121 mtx_unlock(&nmp->nm_mtx);
123 npages = btoc(count);
126 * If the requested page is partially valid, just return it and
127 * allow the pager to zero-out the blanks. Partially valid pages
128 * can only occur at the file EOF.
130 VM_OBJECT_LOCK(object);
131 if (pages[ap->a_reqpage]->valid != 0) {
132 for (i = 0; i < npages; ++i) {
133 if (i != ap->a_reqpage) {
134 vm_page_lock(pages[i]);
135 vm_page_free(pages[i]);
136 vm_page_unlock(pages[i]);
139 VM_OBJECT_UNLOCK(object);
142 VM_OBJECT_UNLOCK(object);
145 * We use only the kva address for the buffer, but this is extremely
146 * convienient and fast.
148 bp = getpbuf(&nfs_pbuf_freecnt);
150 kva = (vm_offset_t) bp->b_data;
151 pmap_qenter(kva, pages, npages);
152 PCPU_INC(cnt.v_vnodein);
153 PCPU_ADD(cnt.v_vnodepgsin, npages);
155 iov.iov_base = (caddr_t) kva;
159 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
160 uio.uio_resid = count;
161 uio.uio_segflg = UIO_SYSSPACE;
162 uio.uio_rw = UIO_READ;
165 error = (nmp->nm_rpcops->nr_readrpc)(vp, &uio, cred);
166 pmap_qremove(kva, npages);
168 relpbuf(bp, &nfs_pbuf_freecnt);
170 if (error && (uio.uio_resid == count)) {
171 nfs_printf("nfs_getpages: error %d\n", error);
172 VM_OBJECT_LOCK(object);
173 for (i = 0; i < npages; ++i) {
174 if (i != ap->a_reqpage) {
175 vm_page_lock(pages[i]);
176 vm_page_free(pages[i]);
177 vm_page_unlock(pages[i]);
180 VM_OBJECT_UNLOCK(object);
181 return (VM_PAGER_ERROR);
185 * Calculate the number of bytes read and validate only that number
186 * of bytes. Note that due to pending writes, size may be 0. This
187 * does not mean that the remaining data is invalid!
190 size = count - uio.uio_resid;
191 VM_OBJECT_LOCK(object);
192 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
194 nextoff = toff + PAGE_SIZE;
197 if (nextoff <= size) {
199 * Read operation filled an entire page
201 m->valid = VM_PAGE_BITS_ALL;
202 KASSERT(m->dirty == 0,
203 ("nfs_getpages: page %p is dirty", m));
204 } else if (size > toff) {
206 * Read operation filled a partial page.
209 vm_page_set_valid(m, 0, size - toff);
210 KASSERT(m->dirty == 0,
211 ("nfs_getpages: page %p is dirty", m));
214 * Read operation was short. If no error occured
215 * we may have hit a zero-fill section. We simply
216 * leave valid set to 0.
220 if (i != ap->a_reqpage) {
222 * Whether or not to leave the page activated is up in
223 * the air, but we should put the page on a page queue
224 * somewhere (it already is in the object). Result:
225 * It appears that emperical results show that
226 * deactivating pages is best.
230 * Just in case someone was asking for this page we
231 * now tell them that it is ok to use.
234 if (m->oflags & VPO_WANTED) {
240 vm_page_deactivate(m);
251 VM_OBJECT_UNLOCK(object);
256 * Vnode op for VM putpages.
259 nfs_putpages(struct vop_putpages_args *ap)
265 int iomode, must_commit, i, error, npages, count;
271 struct nfsmount *nmp;
277 td = curthread; /* XXX */
278 cred = curthread->td_ucred; /* XXX */
279 nmp = VFSTONFS(vp->v_mount);
282 rtvals = ap->a_rtvals;
283 npages = btoc(count);
284 offset = IDX_TO_OFF(pages[0]->pindex);
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)nfs_fsinfo(nmp, vp, cred, td);
292 mtx_unlock(&nmp->nm_mtx);
294 mtx_lock(&np->n_mtx);
295 if (nfs_directio_enable && !nfs_directio_allow_mmap &&
296 (np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
297 mtx_unlock(&np->n_mtx);
298 nfs_printf("nfs_putpages: called on noncache-able vnode??\n");
299 mtx_lock(&np->n_mtx);
302 for (i = 0; i < npages; i++)
303 rtvals[i] = VM_PAGER_AGAIN;
306 * When putting pages, do not extend file past EOF.
308 if (offset + count > np->n_size) {
309 count = np->n_size - offset;
313 mtx_unlock(&np->n_mtx);
316 * We use only the kva address for the buffer, but this is extremely
317 * convienient and fast.
319 bp = getpbuf(&nfs_pbuf_freecnt);
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);
326 iov.iov_base = (caddr_t) kva;
330 uio.uio_offset = offset;
331 uio.uio_resid = count;
332 uio.uio_segflg = UIO_SYSSPACE;
333 uio.uio_rw = UIO_WRITE;
336 if ((ap->a_sync & VM_PAGER_PUT_SYNC) == 0)
337 iomode = NFSV3WRITE_UNSTABLE;
339 iomode = NFSV3WRITE_FILESYNC;
341 error = (nmp->nm_rpcops->nr_writerpc)(vp, &uio, cred, &iomode, &must_commit);
343 pmap_qremove(kva, npages);
344 relpbuf(bp, &nfs_pbuf_freecnt);
347 int nwritten = round_page(count - uio.uio_resid) / PAGE_SIZE;
348 for (i = 0; i < nwritten; i++) {
349 rtvals[i] = VM_PAGER_OK;
350 vm_page_undirty(pages[i]);
353 nfs_clearcommit(vp->v_mount);
360 * For nfs, cache consistency can only be maintained approximately.
361 * Although RFC1094 does not specify the criteria, the following is
362 * believed to be compatible with the reference port.
364 * If the file's modify time on the server has changed since the
365 * last read rpc or you have written to the file,
366 * you may have lost data cache consistency with the
367 * server, so flush all of the file's data out of the cache.
368 * Then force a getattr rpc to ensure that you have up to date
370 * NB: This implies that cache data can be read when up to
371 * NFS_ATTRTIMEO seconds out of date. If you find that you need current
372 * attributes this could be forced by setting n_attrstamp to 0 before
373 * the VOP_GETATTR() call.
376 nfs_bioread_check_cons(struct vnode *vp, struct thread *td, struct ucred *cred)
380 struct nfsnode *np = VTONFS(vp);
382 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
385 * Grab the exclusive lock before checking whether the cache is
387 * XXX - We can make this cheaper later (by acquiring cheaper locks).
388 * But for now, this suffices.
390 old_lock = nfs_upgrade_vnlock(vp);
391 if (vp->v_iflag & VI_DOOMED) {
392 nfs_downgrade_vnlock(vp, old_lock);
396 mtx_lock(&np->n_mtx);
397 if (np->n_flag & NMODIFIED) {
398 mtx_unlock(&np->n_mtx);
399 if (vp->v_type != VREG) {
400 if (vp->v_type != VDIR)
401 panic("nfs: bioread, not dir");
402 (nmp->nm_rpcops->nr_invaldir)(vp);
403 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
408 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
409 error = VOP_GETATTR(vp, &vattr, cred);
412 mtx_lock(&np->n_mtx);
413 np->n_mtime = vattr.va_mtime;
414 mtx_unlock(&np->n_mtx);
416 mtx_unlock(&np->n_mtx);
417 error = VOP_GETATTR(vp, &vattr, cred);
420 mtx_lock(&np->n_mtx);
421 if ((np->n_flag & NSIZECHANGED)
422 || (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime))) {
423 mtx_unlock(&np->n_mtx);
424 if (vp->v_type == VDIR)
425 (nmp->nm_rpcops->nr_invaldir)(vp);
426 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
429 mtx_lock(&np->n_mtx);
430 np->n_mtime = vattr.va_mtime;
431 np->n_flag &= ~NSIZECHANGED;
433 mtx_unlock(&np->n_mtx);
436 nfs_downgrade_vnlock(vp, old_lock);
441 * Vnode op for read using bio
444 nfs_bioread(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred)
446 struct nfsnode *np = VTONFS(vp);
448 struct buf *bp, *rabp;
450 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
454 int nra, error = 0, n = 0, on = 0;
456 KASSERT(uio->uio_rw == UIO_READ, ("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, 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, 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, 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, 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, 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;
829 error = nfs_asyncio(nmp, bp, NOCRED, td);
831 free(t_iov->iov_base, M_NFSDIRECTIO);
832 free(t_iov, M_NFSDIRECTIO);
833 free(t_uio, M_NFSDIRECTIO);
835 relpbuf(bp, &nfs_pbuf_freecnt);
840 uiop->uio_offset += size;
841 uiop->uio_resid -= size;
842 if (uiop->uio_iov->iov_len <= size) {
846 uiop->uio_iov->iov_base =
847 (char *)uiop->uio_iov->iov_base + size;
848 uiop->uio_iov->iov_len -= size;
856 * Vnode op for write using bio
859 nfs_write(struct vop_write_args *ap)
862 struct uio *uio = ap->a_uio;
863 struct thread *td = uio->uio_td;
864 struct vnode *vp = ap->a_vp;
865 struct nfsnode *np = VTONFS(vp);
866 struct ucred *cred = ap->a_cred;
867 int ioflag = ap->a_ioflag;
870 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
873 int n, on, error = 0;
875 KASSERT(uio->uio_rw == UIO_WRITE, ("nfs_write mode"));
876 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
878 if (vp->v_type != VREG)
880 mtx_lock(&np->n_mtx);
881 if (np->n_flag & NWRITEERR) {
882 np->n_flag &= ~NWRITEERR;
883 mtx_unlock(&np->n_mtx);
884 return (np->n_error);
886 mtx_unlock(&np->n_mtx);
887 mtx_lock(&nmp->nm_mtx);
888 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
889 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
890 mtx_unlock(&nmp->nm_mtx);
891 (void)nfs_fsinfo(nmp, vp, cred, td);
893 mtx_unlock(&nmp->nm_mtx);
896 * Synchronously flush pending buffers if we are in synchronous
897 * mode or if we are appending.
899 if (ioflag & (IO_APPEND | IO_SYNC)) {
900 mtx_lock(&np->n_mtx);
901 if (np->n_flag & NMODIFIED) {
902 mtx_unlock(&np->n_mtx);
903 #ifdef notyet /* Needs matching nonblock semantics elsewhere, too. */
905 * Require non-blocking, synchronous writes to
906 * dirty files to inform the program it needs
907 * to fsync(2) explicitly.
909 if (ioflag & IO_NDELAY)
914 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
915 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
919 mtx_unlock(&np->n_mtx);
923 * If IO_APPEND then load uio_offset. We restart here if we cannot
924 * get the append lock.
926 if (ioflag & IO_APPEND) {
928 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
929 error = VOP_GETATTR(vp, &vattr, cred);
932 mtx_lock(&np->n_mtx);
933 uio->uio_offset = np->n_size;
934 mtx_unlock(&np->n_mtx);
937 if (uio->uio_offset < 0)
939 if ((uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
941 if (uio->uio_resid == 0)
944 if (nfs_directio_enable && (ioflag & IO_DIRECT) && vp->v_type == VREG)
945 return nfs_directio_write(vp, uio, cred, ioflag);
948 * Maybe this should be above the vnode op call, but so long as
949 * file servers have no limits, i don't think it matters
951 if (vn_rlimit_fsize(vp, uio, td))
954 biosize = vp->v_mount->mnt_stat.f_iosize;
956 * Find all of this file's B_NEEDCOMMIT buffers. If our writes
957 * would exceed the local maximum per-file write commit size when
958 * combined with those, we must decide whether to flush,
959 * go synchronous, or return error. We don't bother checking
960 * IO_UNIT -- we just make all writes atomic anyway, as there's
961 * no point optimizing for something that really won't ever happen.
963 if (!(ioflag & IO_SYNC)) {
966 mtx_lock(&np->n_mtx);
968 mtx_unlock(&np->n_mtx);
970 if (nmp->nm_wcommitsize < uio->uio_resid) {
972 * If this request could not possibly be completed
973 * without exceeding the maximum outstanding write
974 * commit size, see if we can convert it into a
975 * synchronous write operation.
977 if (ioflag & IO_NDELAY)
980 if (nflag & NMODIFIED)
982 } else if (nflag & NMODIFIED) {
984 BO_LOCK(&vp->v_bufobj);
985 if (vp->v_bufobj.bo_dirty.bv_cnt != 0) {
986 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd,
988 if (bp->b_flags & B_NEEDCOMMIT)
989 wouldcommit += bp->b_bcount;
992 BO_UNLOCK(&vp->v_bufobj);
994 * Since we're not operating synchronously and
995 * bypassing the buffer cache, we are in a commit
996 * and holding all of these buffers whether
997 * transmitted or not. If not limited, this
998 * will lead to the buffer cache deadlocking,
999 * as no one else can flush our uncommitted buffers.
1001 wouldcommit += uio->uio_resid;
1003 * If we would initially exceed the maximum
1004 * outstanding write commit size, flush and restart.
1006 if (wouldcommit > nmp->nm_wcommitsize)
1010 goto flush_and_restart;
1014 nfsstats.biocache_writes++;
1015 lbn = uio->uio_offset / biosize;
1016 on = uio->uio_offset & (biosize-1);
1017 n = min((unsigned)(biosize - on), uio->uio_resid);
1020 * Handle direct append and file extension cases, calculate
1021 * unaligned buffer size.
1023 mtx_lock(&np->n_mtx);
1024 if (uio->uio_offset == np->n_size && n) {
1025 mtx_unlock(&np->n_mtx);
1027 * Get the buffer (in its pre-append state to maintain
1028 * B_CACHE if it was previously set). Resize the
1029 * nfsnode after we have locked the buffer to prevent
1030 * readers from reading garbage.
1033 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1038 mtx_lock(&np->n_mtx);
1039 np->n_size = uio->uio_offset + n;
1040 np->n_flag |= NMODIFIED;
1041 vnode_pager_setsize(vp, np->n_size);
1042 mtx_unlock(&np->n_mtx);
1044 save = bp->b_flags & B_CACHE;
1046 allocbuf(bp, bcount);
1047 bp->b_flags |= save;
1051 * Obtain the locked cache block first, and then
1052 * adjust the file's size as appropriate.
1055 if ((off_t)lbn * biosize + bcount < np->n_size) {
1056 if ((off_t)(lbn + 1) * biosize < np->n_size)
1059 bcount = np->n_size - (off_t)lbn * biosize;
1061 mtx_unlock(&np->n_mtx);
1062 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1063 mtx_lock(&np->n_mtx);
1064 if (uio->uio_offset + n > np->n_size) {
1065 np->n_size = uio->uio_offset + n;
1066 np->n_flag |= NMODIFIED;
1067 vnode_pager_setsize(vp, np->n_size);
1069 mtx_unlock(&np->n_mtx);
1073 error = nfs_sigintr(nmp, td);
1080 * Issue a READ if B_CACHE is not set. In special-append
1081 * mode, B_CACHE is based on the buffer prior to the write
1082 * op and is typically set, avoiding the read. If a read
1083 * is required in special append mode, the server will
1084 * probably send us a short-read since we extended the file
1085 * on our end, resulting in b_resid == 0 and, thusly,
1086 * B_CACHE getting set.
1088 * We can also avoid issuing the read if the write covers
1089 * the entire buffer. We have to make sure the buffer state
1090 * is reasonable in this case since we will not be initiating
1091 * I/O. See the comments in kern/vfs_bio.c's getblk() for
1094 * B_CACHE may also be set due to the buffer being cached
1098 if (on == 0 && n == bcount) {
1099 bp->b_flags |= B_CACHE;
1100 bp->b_flags &= ~B_INVAL;
1101 bp->b_ioflags &= ~BIO_ERROR;
1104 if ((bp->b_flags & B_CACHE) == 0) {
1105 bp->b_iocmd = BIO_READ;
1106 vfs_busy_pages(bp, 0);
1107 error = nfs_doio(vp, bp, cred, td);
1113 if (bp->b_wcred == NOCRED)
1114 bp->b_wcred = crhold(cred);
1115 mtx_lock(&np->n_mtx);
1116 np->n_flag |= NMODIFIED;
1117 mtx_unlock(&np->n_mtx);
1120 * If dirtyend exceeds file size, chop it down. This should
1121 * not normally occur but there is an append race where it
1122 * might occur XXX, so we log it.
1124 * If the chopping creates a reverse-indexed or degenerate
1125 * situation with dirtyoff/end, we 0 both of them.
1128 if (bp->b_dirtyend > bcount) {
1129 nfs_printf("NFS append race @%lx:%d\n",
1130 (long)bp->b_blkno * DEV_BSIZE,
1131 bp->b_dirtyend - bcount);
1132 bp->b_dirtyend = bcount;
1135 if (bp->b_dirtyoff >= bp->b_dirtyend)
1136 bp->b_dirtyoff = bp->b_dirtyend = 0;
1139 * If the new write will leave a contiguous dirty
1140 * area, just update the b_dirtyoff and b_dirtyend,
1141 * otherwise force a write rpc of the old dirty area.
1143 * While it is possible to merge discontiguous writes due to
1144 * our having a B_CACHE buffer ( and thus valid read data
1145 * for the hole), we don't because it could lead to
1146 * significant cache coherency problems with multiple clients,
1147 * especially if locking is implemented later on.
1149 * as an optimization we could theoretically maintain
1150 * a linked list of discontinuous areas, but we would still
1151 * have to commit them separately so there isn't much
1152 * advantage to it except perhaps a bit of asynchronization.
1155 if (bp->b_dirtyend > 0 &&
1156 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
1157 if (bwrite(bp) == EINTR) {
1164 error = uiomove((char *)bp->b_data + on, n, uio);
1167 * Since this block is being modified, it must be written
1168 * again and not just committed. Since write clustering does
1169 * not work for the stage 1 data write, only the stage 2
1170 * commit rpc, we have to clear B_CLUSTEROK as well.
1172 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1175 bp->b_ioflags |= BIO_ERROR;
1181 * Only update dirtyoff/dirtyend if not a degenerate
1185 if (bp->b_dirtyend > 0) {
1186 bp->b_dirtyoff = min(on, bp->b_dirtyoff);
1187 bp->b_dirtyend = max((on + n), bp->b_dirtyend);
1189 bp->b_dirtyoff = on;
1190 bp->b_dirtyend = on + n;
1192 vfs_bio_set_valid(bp, on, n);
1196 * If IO_SYNC do bwrite().
1198 * IO_INVAL appears to be unused. The idea appears to be
1199 * to turn off caching in this case. Very odd. XXX
1201 if ((ioflag & IO_SYNC)) {
1202 if (ioflag & IO_INVAL)
1203 bp->b_flags |= B_NOCACHE;
1207 } else if ((n + on) == biosize) {
1208 bp->b_flags |= B_ASYNC;
1209 (void) (nmp->nm_rpcops->nr_writebp)(bp, 0, NULL);
1213 } while (uio->uio_resid > 0 && n > 0);
1219 * Get an nfs cache block.
1221 * Allocate a new one if the block isn't currently in the cache
1222 * and return the block marked busy. If the calling process is
1223 * interrupted by a signal for an interruptible mount point, return
1226 * The caller must carefully deal with the possible B_INVAL state of
1227 * the buffer. nfs_doio() clears B_INVAL (and nfs_asyncio() clears it
1228 * indirectly), so synchronous reads can be issued without worrying about
1229 * the B_INVAL state. We have to be a little more careful when dealing
1230 * with writes (see comments in nfs_write()) when extending a file past
1234 nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct thread *td)
1238 struct nfsmount *nmp;
1243 if (nmp->nm_flag & NFSMNT_INT) {
1246 nfs_set_sigmask(td, &oldset);
1247 bp = getblk(vp, bn, size, NFS_PCATCH, 0, 0);
1248 nfs_restore_sigmask(td, &oldset);
1249 while (bp == NULL) {
1250 if (nfs_sigintr(nmp, td))
1252 bp = getblk(vp, bn, size, 0, 2 * hz, 0);
1255 bp = getblk(vp, bn, size, 0, 0, 0);
1258 if (vp->v_type == VREG) {
1261 biosize = mp->mnt_stat.f_iosize;
1262 bp->b_blkno = bn * (biosize / DEV_BSIZE);
1268 * Flush and invalidate all dirty buffers. If another process is already
1269 * doing the flush, just wait for completion.
1272 nfs_vinvalbuf(struct vnode *vp, int flags, struct thread *td, int intrflg)
1274 struct nfsnode *np = VTONFS(vp);
1275 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1276 int error = 0, slpflag, slptimeo;
1279 ASSERT_VOP_LOCKED(vp, "nfs_vinvalbuf");
1281 if ((nmp->nm_flag & NFSMNT_INT) == 0)
1284 slpflag = NFS_PCATCH;
1291 old_lock = nfs_upgrade_vnlock(vp);
1292 if (vp->v_iflag & VI_DOOMED) {
1294 * Since vgonel() uses the generic vinvalbuf() to flush
1295 * dirty buffers and it does not call this function, it
1296 * is safe to just return OK when VI_DOOMED is set.
1298 nfs_downgrade_vnlock(vp, old_lock);
1303 * Now, flush as required.
1305 if ((flags & V_SAVE) && (vp->v_bufobj.bo_object != NULL)) {
1306 VM_OBJECT_LOCK(vp->v_bufobj.bo_object);
1307 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
1308 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object);
1310 * If the page clean was interrupted, fail the invalidation.
1311 * Not doing so, we run the risk of losing dirty pages in the
1312 * vinvalbuf() call below.
1314 if (intrflg && (error = nfs_sigintr(nmp, td)))
1318 error = vinvalbuf(vp, flags, slpflag, 0);
1320 if (intrflg && (error = nfs_sigintr(nmp, td)))
1322 error = vinvalbuf(vp, flags, 0, slptimeo);
1324 mtx_lock(&np->n_mtx);
1325 if (np->n_directio_asyncwr == 0)
1326 np->n_flag &= ~NMODIFIED;
1327 mtx_unlock(&np->n_mtx);
1329 nfs_downgrade_vnlock(vp, old_lock);
1334 * Initiate asynchronous I/O. Return an error if no nfsiods are available.
1335 * This is mainly to avoid queueing async I/O requests when the nfsiods
1336 * are all hung on a dead server.
1338 * Note: nfs_asyncio() does not clear (BIO_ERROR|B_INVAL) but when the bp
1339 * is eventually dequeued by the async daemon, nfs_doio() *will*.
1342 nfs_asyncio(struct nfsmount *nmp, struct buf *bp, struct ucred *cred, struct thread *td)
1351 * Commits are usually short and sweet so lets save some cpu and
1352 * leave the async daemons for more important rpc's (such as reads
1355 mtx_lock(&nfs_iod_mtx);
1356 if (bp->b_iocmd == BIO_WRITE && (bp->b_flags & B_NEEDCOMMIT) &&
1357 (nmp->nm_bufqiods > nfs_numasync / 2)) {
1358 mtx_unlock(&nfs_iod_mtx);
1362 if (nmp->nm_flag & NFSMNT_INT)
1363 slpflag = NFS_PCATCH;
1367 * Find a free iod to process this request.
1369 for (iod = 0; iod < nfs_numasync; iod++)
1370 if (nfs_iodwant[iod] == NFSIOD_AVAILABLE) {
1376 * Try to create one if none are free.
1382 * Found one, so wake it up and tell it which
1385 NFS_DPF(ASYNCIO, ("nfs_asyncio: waking iod %d for mount %p\n",
1387 nfs_iodwant[iod] = NFSIOD_NOT_AVAILABLE;
1388 nfs_iodmount[iod] = nmp;
1390 wakeup(&nfs_iodwant[iod]);
1394 * If none are free, we may already have an iod working on this mount
1395 * point. If so, it will process our request.
1398 if (nmp->nm_bufqiods > 0) {
1400 ("nfs_asyncio: %d iods are already processing mount %p\n",
1401 nmp->nm_bufqiods, nmp));
1407 * If we have an iod which can process the request, then queue
1412 * Ensure that the queue never grows too large. We still want
1413 * to asynchronize so we block rather then return EIO.
1415 while (nmp->nm_bufqlen >= 2 * nfs_numasync) {
1417 ("nfs_asyncio: waiting for mount %p queue to drain\n", nmp));
1418 nmp->nm_bufqwant = TRUE;
1419 error = nfs_msleep(td, &nmp->nm_bufq, &nfs_iod_mtx,
1421 "nfsaio", slptimeo);
1423 error2 = nfs_sigintr(nmp, td);
1425 mtx_unlock(&nfs_iod_mtx);
1428 if (slpflag == NFS_PCATCH) {
1434 * We might have lost our iod while sleeping,
1435 * so check and loop if nescessary.
1440 /* We might have lost our nfsiod */
1441 if (nmp->nm_bufqiods == 0) {
1443 ("nfs_asyncio: no iods after mount %p queue was drained, looping\n", nmp));
1447 if (bp->b_iocmd == BIO_READ) {
1448 if (bp->b_rcred == NOCRED && cred != NOCRED)
1449 bp->b_rcred = crhold(cred);
1451 if (bp->b_wcred == NOCRED && cred != NOCRED)
1452 bp->b_wcred = crhold(cred);
1455 if (bp->b_flags & B_REMFREE)
1458 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist);
1460 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1461 mtx_lock(&(VTONFS(bp->b_vp))->n_mtx);
1462 VTONFS(bp->b_vp)->n_flag |= NMODIFIED;
1463 VTONFS(bp->b_vp)->n_directio_asyncwr++;
1464 mtx_unlock(&(VTONFS(bp->b_vp))->n_mtx);
1466 mtx_unlock(&nfs_iod_mtx);
1470 mtx_unlock(&nfs_iod_mtx);
1473 * All the iods are busy on other mounts, so return EIO to
1474 * force the caller to process the i/o synchronously.
1476 NFS_DPF(ASYNCIO, ("nfs_asyncio: no iods available, i/o is synchronous\n"));
1481 nfs_doio_directwrite(struct buf *bp)
1483 int iomode, must_commit;
1484 struct uio *uiop = (struct uio *)bp->b_caller1;
1485 char *iov_base = uiop->uio_iov->iov_base;
1486 struct nfsmount *nmp = VFSTONFS(bp->b_vp->v_mount);
1488 iomode = NFSV3WRITE_FILESYNC;
1489 uiop->uio_td = NULL; /* NULL since we're in nfsiod */
1490 (nmp->nm_rpcops->nr_writerpc)(bp->b_vp, uiop, bp->b_wcred, &iomode, &must_commit);
1491 KASSERT((must_commit == 0), ("nfs_doio_directwrite: Did not commit write"));
1492 free(iov_base, M_NFSDIRECTIO);
1493 free(uiop->uio_iov, M_NFSDIRECTIO);
1494 free(uiop, M_NFSDIRECTIO);
1495 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1496 struct nfsnode *np = VTONFS(bp->b_vp);
1497 mtx_lock(&np->n_mtx);
1498 np->n_directio_asyncwr--;
1499 if (np->n_directio_asyncwr == 0) {
1500 VTONFS(bp->b_vp)->n_flag &= ~NMODIFIED;
1501 if ((np->n_flag & NFSYNCWAIT)) {
1502 np->n_flag &= ~NFSYNCWAIT;
1503 wakeup((caddr_t)&np->n_directio_asyncwr);
1506 mtx_unlock(&np->n_mtx);
1509 relpbuf(bp, &nfs_pbuf_freecnt);
1513 * Do an I/O operation to/from a cache block. This may be called
1514 * synchronously or from an nfsiod.
1517 nfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td)
1521 struct nfsmount *nmp;
1522 int error = 0, iomode, must_commit = 0;
1525 struct proc *p = td ? td->td_proc : NULL;
1529 nmp = VFSTONFS(vp->v_mount);
1531 uiop->uio_iov = &io;
1532 uiop->uio_iovcnt = 1;
1533 uiop->uio_segflg = UIO_SYSSPACE;
1537 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
1538 * do this here so we do not have to do it in all the code that
1541 bp->b_flags &= ~B_INVAL;
1542 bp->b_ioflags &= ~BIO_ERROR;
1544 KASSERT(!(bp->b_flags & B_DONE), ("nfs_doio: bp %p already marked done", bp));
1545 iocmd = bp->b_iocmd;
1546 if (iocmd == BIO_READ) {
1547 io.iov_len = uiop->uio_resid = bp->b_bcount;
1548 io.iov_base = bp->b_data;
1549 uiop->uio_rw = UIO_READ;
1551 switch (vp->v_type) {
1553 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
1554 nfsstats.read_bios++;
1555 error = (nmp->nm_rpcops->nr_readrpc)(vp, uiop, cr);
1558 if (uiop->uio_resid) {
1560 * If we had a short read with no error, we must have
1561 * hit a file hole. We should zero-fill the remainder.
1562 * This can also occur if the server hits the file EOF.
1564 * Holes used to be able to occur due to pending
1565 * writes, but that is not possible any longer.
1567 int nread = bp->b_bcount - uiop->uio_resid;
1568 int left = uiop->uio_resid;
1571 bzero((char *)bp->b_data + nread, left);
1572 uiop->uio_resid = 0;
1575 /* ASSERT_VOP_LOCKED(vp, "nfs_doio"); */
1576 if (p && (vp->v_vflag & VV_TEXT)) {
1577 mtx_lock(&np->n_mtx);
1578 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &np->n_vattr.va_mtime)) {
1579 mtx_unlock(&np->n_mtx);
1581 killproc(p, "text file modification");
1584 mtx_unlock(&np->n_mtx);
1588 uiop->uio_offset = (off_t)0;
1589 nfsstats.readlink_bios++;
1590 error = (nmp->nm_rpcops->nr_readlinkrpc)(vp, uiop, cr);
1593 nfsstats.readdir_bios++;
1594 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
1595 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) != 0) {
1596 error = nfs_readdirplusrpc(vp, uiop, cr);
1597 if (error == NFSERR_NOTSUPP)
1598 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
1600 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
1601 error = nfs_readdirrpc(vp, uiop, cr);
1603 * end-of-directory sets B_INVAL but does not generate an
1606 if (error == 0 && uiop->uio_resid == bp->b_bcount)
1607 bp->b_flags |= B_INVAL;
1610 nfs_printf("nfs_doio: type %x unexpected\n", vp->v_type);
1614 bp->b_ioflags |= BIO_ERROR;
1615 bp->b_error = error;
1619 * If we only need to commit, try to commit
1621 if (bp->b_flags & B_NEEDCOMMIT) {
1625 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
1626 retv = (nmp->nm_rpcops->nr_commit)(
1627 vp, off, bp->b_dirtyend-bp->b_dirtyoff,
1630 bp->b_dirtyoff = bp->b_dirtyend = 0;
1631 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1636 if (retv == NFSERR_STALEWRITEVERF) {
1637 nfs_clearcommit(vp->v_mount);
1642 * Setup for actual write
1644 mtx_lock(&np->n_mtx);
1645 if ((off_t)bp->b_blkno * DEV_BSIZE + bp->b_dirtyend > np->n_size)
1646 bp->b_dirtyend = np->n_size - (off_t)bp->b_blkno * DEV_BSIZE;
1647 mtx_unlock(&np->n_mtx);
1649 if (bp->b_dirtyend > bp->b_dirtyoff) {
1650 io.iov_len = uiop->uio_resid = bp->b_dirtyend
1652 uiop->uio_offset = (off_t)bp->b_blkno * DEV_BSIZE
1654 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
1655 uiop->uio_rw = UIO_WRITE;
1656 nfsstats.write_bios++;
1658 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC)
1659 iomode = NFSV3WRITE_UNSTABLE;
1661 iomode = NFSV3WRITE_FILESYNC;
1663 error = (nmp->nm_rpcops->nr_writerpc)(vp, uiop, cr, &iomode, &must_commit);
1666 * When setting B_NEEDCOMMIT also set B_CLUSTEROK to try
1667 * to cluster the buffers needing commit. This will allow
1668 * the system to submit a single commit rpc for the whole
1669 * cluster. We can do this even if the buffer is not 100%
1670 * dirty (relative to the NFS blocksize), so we optimize the
1671 * append-to-file-case.
1673 * (when clearing B_NEEDCOMMIT, B_CLUSTEROK must also be
1674 * cleared because write clustering only works for commit
1675 * rpc's, not for the data portion of the write).
1678 if (!error && iomode == NFSV3WRITE_UNSTABLE) {
1679 bp->b_flags |= B_NEEDCOMMIT;
1680 if (bp->b_dirtyoff == 0
1681 && bp->b_dirtyend == bp->b_bcount)
1682 bp->b_flags |= B_CLUSTEROK;
1684 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1688 * For an interrupted write, the buffer is still valid
1689 * and the write hasn't been pushed to the server yet,
1690 * so we can't set BIO_ERROR and report the interruption
1691 * by setting B_EINTR. For the B_ASYNC case, B_EINTR
1692 * is not relevant, so the rpc attempt is essentially
1693 * a noop. For the case of a V3 write rpc not being
1694 * committed to stable storage, the block is still
1695 * dirty and requires either a commit rpc or another
1696 * write rpc with iomode == NFSV3WRITE_FILESYNC before
1697 * the block is reused. This is indicated by setting
1698 * the B_DELWRI and B_NEEDCOMMIT flags.
1700 * If the buffer is marked B_PAGING, it does not reside on
1701 * the vp's paging queues so we cannot call bdirty(). The
1702 * bp in this case is not an NFS cache block so we should
1705 * The logic below breaks up errors into recoverable and
1706 * unrecoverable. For the former, we clear B_INVAL|B_NOCACHE
1707 * and keep the buffer around for potential write retries.
1708 * For the latter (eg ESTALE), we toss the buffer away (B_INVAL)
1709 * and save the error in the nfsnode. This is less than ideal
1710 * but necessary. Keeping such buffers around could potentially
1711 * cause buffer exhaustion eventually (they can never be written
1712 * out, so will get constantly be re-dirtied). It also causes
1713 * all sorts of vfs panics. For non-recoverable write errors,
1714 * also invalidate the attrcache, so we'll be forced to go over
1715 * the wire for this object, returning an error to user on next
1716 * call (most of the time).
1718 if (error == EINTR || error == EIO || error == ETIMEDOUT
1719 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
1723 bp->b_flags &= ~(B_INVAL|B_NOCACHE);
1724 if ((bp->b_flags & B_PAGING) == 0) {
1726 bp->b_flags &= ~B_DONE;
1728 if (error && (bp->b_flags & B_ASYNC) == 0)
1729 bp->b_flags |= B_EINTR;
1733 bp->b_ioflags |= BIO_ERROR;
1734 bp->b_flags |= B_INVAL;
1735 bp->b_error = np->n_error = error;
1736 mtx_lock(&np->n_mtx);
1737 np->n_flag |= NWRITEERR;
1738 np->n_attrstamp = 0;
1739 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1740 mtx_unlock(&np->n_mtx);
1742 bp->b_dirtyoff = bp->b_dirtyend = 0;
1750 bp->b_resid = uiop->uio_resid;
1752 nfs_clearcommit(vp->v_mount);
1758 * Used to aid in handling ftruncate() operations on the NFS client side.
1759 * Truncation creates a number of special problems for NFS. We have to
1760 * throw away VM pages and buffer cache buffers that are beyond EOF, and
1761 * we have to properly handle VM pages or (potentially dirty) buffers
1762 * that straddle the truncation point.
1766 nfs_meta_setsize(struct vnode *vp, struct ucred *cred, struct thread *td, u_quad_t nsize)
1768 struct nfsnode *np = VTONFS(vp);
1770 int biosize = vp->v_mount->mnt_stat.f_iosize;
1773 mtx_lock(&np->n_mtx);
1776 mtx_unlock(&np->n_mtx);
1778 if (nsize < tsize) {
1784 * vtruncbuf() doesn't get the buffer overlapping the
1785 * truncation point. We may have a B_DELWRI and/or B_CACHE
1786 * buffer that now needs to be truncated.
1788 error = vtruncbuf(vp, cred, td, nsize, biosize);
1789 lbn = nsize / biosize;
1790 bufsize = nsize & (biosize - 1);
1791 bp = nfs_getcacheblk(vp, lbn, bufsize, td);
1794 if (bp->b_dirtyoff > bp->b_bcount)
1795 bp->b_dirtyoff = bp->b_bcount;
1796 if (bp->b_dirtyend > bp->b_bcount)
1797 bp->b_dirtyend = bp->b_bcount;
1798 bp->b_flags |= B_RELBUF; /* don't leave garbage around */
1801 vnode_pager_setsize(vp, nsize);