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_param.h>
53 #include <vm/vm_extern.h>
54 #include <vm/vm_page.h>
55 #include <vm/vm_object.h>
56 #include <vm/vm_pager.h>
57 #include <vm/vnode_pager.h>
59 #include <nfs/nfsproto.h>
60 #include <nfsclient/nfs.h>
61 #include <nfsclient/nfsmount.h>
62 #include <nfsclient/nfsnode.h>
63 #include <nfs/nfs_kdtrace.h>
65 static struct buf *nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size,
67 static int nfs_directio_write(struct vnode *vp, struct uio *uiop,
68 struct ucred *cred, int ioflag);
70 extern int nfs_directio_enable;
71 extern int nfs_directio_allow_mmap;
74 * Vnode op for VM getpages.
77 nfs_getpages(struct vop_getpages_args *ap)
79 int i, error, nextoff, size, toff, count, npages;
94 td = curthread; /* XXX */
95 cred = curthread->td_ucred; /* XXX */
96 nmp = VFSTONFS(vp->v_mount);
100 if ((object = vp->v_object) == NULL) {
101 nfs_printf("nfs_getpages: called with non-merged cache vnode??\n");
102 return (VM_PAGER_ERROR);
105 if (nfs_directio_enable && !nfs_directio_allow_mmap) {
106 mtx_lock(&np->n_mtx);
107 if ((np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
108 mtx_unlock(&np->n_mtx);
109 nfs_printf("nfs_getpages: called on non-cacheable vnode??\n");
110 return (VM_PAGER_ERROR);
112 mtx_unlock(&np->n_mtx);
115 mtx_lock(&nmp->nm_mtx);
116 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
117 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
118 mtx_unlock(&nmp->nm_mtx);
119 /* We'll never get here for v4, because we always have fsinfo */
120 (void)nfs_fsinfo(nmp, vp, cred, td);
122 mtx_unlock(&nmp->nm_mtx);
124 npages = btoc(count);
127 * If the requested page is partially valid, just return it and
128 * allow the pager to zero-out the blanks. Partially valid pages
129 * can only occur at the file EOF.
131 VM_OBJECT_LOCK(object);
132 if (pages[ap->a_reqpage]->valid != 0) {
133 for (i = 0; i < npages; ++i) {
134 if (i != ap->a_reqpage) {
135 vm_page_lock(pages[i]);
136 vm_page_free(pages[i]);
137 vm_page_unlock(pages[i]);
140 VM_OBJECT_UNLOCK(object);
143 VM_OBJECT_UNLOCK(object);
146 * We use only the kva address for the buffer, but this is extremely
147 * convienient and fast.
149 bp = getpbuf(&nfs_pbuf_freecnt);
151 kva = (vm_offset_t) bp->b_data;
152 pmap_qenter(kva, pages, npages);
153 PCPU_INC(cnt.v_vnodein);
154 PCPU_ADD(cnt.v_vnodepgsin, npages);
156 iov.iov_base = (caddr_t) kva;
160 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
161 uio.uio_resid = count;
162 uio.uio_segflg = UIO_SYSSPACE;
163 uio.uio_rw = UIO_READ;
166 error = (nmp->nm_rpcops->nr_readrpc)(vp, &uio, cred);
167 pmap_qremove(kva, npages);
169 relpbuf(bp, &nfs_pbuf_freecnt);
171 if (error && (uio.uio_resid == count)) {
172 nfs_printf("nfs_getpages: error %d\n", error);
173 VM_OBJECT_LOCK(object);
174 for (i = 0; i < npages; ++i) {
175 if (i != ap->a_reqpage) {
176 vm_page_lock(pages[i]);
177 vm_page_free(pages[i]);
178 vm_page_unlock(pages[i]);
181 VM_OBJECT_UNLOCK(object);
182 return (VM_PAGER_ERROR);
186 * Calculate the number of bytes read and validate only that number
187 * of bytes. Note that due to pending writes, size may be 0. This
188 * does not mean that the remaining data is invalid!
191 size = count - uio.uio_resid;
192 VM_OBJECT_LOCK(object);
193 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
195 nextoff = toff + PAGE_SIZE;
198 if (nextoff <= size) {
200 * Read operation filled an entire page
202 m->valid = VM_PAGE_BITS_ALL;
203 KASSERT(m->dirty == 0,
204 ("nfs_getpages: page %p is dirty", m));
205 } else if (size > toff) {
207 * Read operation filled a partial page.
210 vm_page_set_valid(m, 0, size - toff);
211 KASSERT(m->dirty == 0,
212 ("nfs_getpages: page %p is dirty", m));
215 * Read operation was short. If no error
216 * occured we may have hit a zero-fill
217 * section. We leave valid set to 0, and page
218 * is freed by vm_page_readahead_finish() if
219 * its index is not equal to requested, or
220 * page is zeroed and set valid by
221 * vm_pager_get_pages() for requested page.
225 if (i != ap->a_reqpage)
226 vm_page_readahead_finish(m);
228 VM_OBJECT_UNLOCK(object);
233 * Vnode op for VM putpages.
236 nfs_putpages(struct vop_putpages_args *ap)
242 int iomode, must_commit, i, error, npages, count;
248 struct nfsmount *nmp;
254 td = curthread; /* XXX */
255 /* Set the cred to n_writecred for the write rpcs. */
256 if (np->n_writecred != NULL)
257 cred = crhold(np->n_writecred);
259 cred = crhold(curthread->td_ucred); /* XXX */
260 nmp = VFSTONFS(vp->v_mount);
263 rtvals = ap->a_rtvals;
264 npages = btoc(count);
265 offset = IDX_TO_OFF(pages[0]->pindex);
267 mtx_lock(&nmp->nm_mtx);
268 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
269 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
270 mtx_unlock(&nmp->nm_mtx);
271 (void)nfs_fsinfo(nmp, vp, cred, td);
273 mtx_unlock(&nmp->nm_mtx);
275 mtx_lock(&np->n_mtx);
276 if (nfs_directio_enable && !nfs_directio_allow_mmap &&
277 (np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
278 mtx_unlock(&np->n_mtx);
279 nfs_printf("nfs_putpages: called on noncache-able vnode??\n");
280 mtx_lock(&np->n_mtx);
283 for (i = 0; i < npages; i++)
284 rtvals[i] = VM_PAGER_ERROR;
287 * When putting pages, do not extend file past EOF.
289 if (offset + count > np->n_size) {
290 count = np->n_size - offset;
294 mtx_unlock(&np->n_mtx);
297 * We use only the kva address for the buffer, but this is extremely
298 * convienient and fast.
300 bp = getpbuf(&nfs_pbuf_freecnt);
302 kva = (vm_offset_t) bp->b_data;
303 pmap_qenter(kva, pages, npages);
304 PCPU_INC(cnt.v_vnodeout);
305 PCPU_ADD(cnt.v_vnodepgsout, count);
307 iov.iov_base = (caddr_t) kva;
311 uio.uio_offset = offset;
312 uio.uio_resid = count;
313 uio.uio_segflg = UIO_SYSSPACE;
314 uio.uio_rw = UIO_WRITE;
317 if ((ap->a_sync & VM_PAGER_PUT_SYNC) == 0)
318 iomode = NFSV3WRITE_UNSTABLE;
320 iomode = NFSV3WRITE_FILESYNC;
322 error = (nmp->nm_rpcops->nr_writerpc)(vp, &uio, cred, &iomode, &must_commit);
325 pmap_qremove(kva, npages);
326 relpbuf(bp, &nfs_pbuf_freecnt);
329 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid);
331 nfs_clearcommit(vp->v_mount);
338 * For nfs, cache consistency can only be maintained approximately.
339 * Although RFC1094 does not specify the criteria, the following is
340 * believed to be compatible with the reference port.
342 * If the file's modify time on the server has changed since the
343 * last read rpc or you have written to the file,
344 * you may have lost data cache consistency with the
345 * server, so flush all of the file's data out of the cache.
346 * Then force a getattr rpc to ensure that you have up to date
348 * NB: This implies that cache data can be read when up to
349 * NFS_ATTRTIMEO seconds out of date. If you find that you need current
350 * attributes this could be forced by setting n_attrstamp to 0 before
351 * the VOP_GETATTR() call.
354 nfs_bioread_check_cons(struct vnode *vp, struct thread *td, struct ucred *cred)
358 struct nfsnode *np = VTONFS(vp);
360 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
363 * Grab the exclusive lock before checking whether the cache is
365 * XXX - We can make this cheaper later (by acquiring cheaper locks).
366 * But for now, this suffices.
368 old_lock = nfs_upgrade_vnlock(vp);
369 if (vp->v_iflag & VI_DOOMED) {
370 nfs_downgrade_vnlock(vp, old_lock);
374 mtx_lock(&np->n_mtx);
375 if (np->n_flag & NMODIFIED) {
376 mtx_unlock(&np->n_mtx);
377 if (vp->v_type != VREG) {
378 if (vp->v_type != VDIR)
379 panic("nfs: bioread, not dir");
380 (nmp->nm_rpcops->nr_invaldir)(vp);
381 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
386 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
387 error = VOP_GETATTR(vp, &vattr, cred);
390 mtx_lock(&np->n_mtx);
391 np->n_mtime = vattr.va_mtime;
392 mtx_unlock(&np->n_mtx);
394 mtx_unlock(&np->n_mtx);
395 error = VOP_GETATTR(vp, &vattr, cred);
398 mtx_lock(&np->n_mtx);
399 if ((np->n_flag & NSIZECHANGED)
400 || (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime))) {
401 mtx_unlock(&np->n_mtx);
402 if (vp->v_type == VDIR)
403 (nmp->nm_rpcops->nr_invaldir)(vp);
404 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
407 mtx_lock(&np->n_mtx);
408 np->n_mtime = vattr.va_mtime;
409 np->n_flag &= ~NSIZECHANGED;
411 mtx_unlock(&np->n_mtx);
414 nfs_downgrade_vnlock(vp, old_lock);
419 * Vnode op for read using bio
422 nfs_bioread(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred)
424 struct nfsnode *np = VTONFS(vp);
426 struct buf *bp, *rabp;
428 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
433 int nra, error = 0, n = 0, on = 0;
435 KASSERT(uio->uio_rw == UIO_READ, ("nfs_read mode"));
436 if (uio->uio_resid == 0)
438 if (uio->uio_offset < 0) /* XXX VDIR cookies can be negative */
442 mtx_lock(&nmp->nm_mtx);
443 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
444 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
445 mtx_unlock(&nmp->nm_mtx);
446 (void)nfs_fsinfo(nmp, vp, cred, td);
448 mtx_unlock(&nmp->nm_mtx);
450 end = uio->uio_offset + uio->uio_resid;
451 if (vp->v_type != VDIR &&
452 (end > nmp->nm_maxfilesize || end < uio->uio_offset))
455 if (nfs_directio_enable && (ioflag & IO_DIRECT) && (vp->v_type == VREG))
456 /* No caching/ no readaheads. Just read data into the user buffer */
457 return nfs_readrpc(vp, uio, cred);
459 biosize = vp->v_bufobj.bo_bsize;
460 seqcount = (int)((off_t)(ioflag >> IO_SEQSHIFT) * biosize / BKVASIZE);
462 error = nfs_bioread_check_cons(vp, td, cred);
469 mtx_lock(&np->n_mtx);
471 mtx_unlock(&np->n_mtx);
473 switch (vp->v_type) {
475 nfsstats.biocache_reads++;
476 lbn = uio->uio_offset / biosize;
477 on = uio->uio_offset & (biosize - 1);
480 * Start the read ahead(s), as required.
482 if (nmp->nm_readahead > 0) {
483 for (nra = 0; nra < nmp->nm_readahead && nra < seqcount &&
484 (off_t)(lbn + 1 + nra) * biosize < nsize; nra++) {
485 rabn = lbn + 1 + nra;
486 if (incore(&vp->v_bufobj, rabn) == NULL) {
487 rabp = nfs_getcacheblk(vp, rabn, biosize, td);
489 error = nfs_sigintr(nmp, td);
490 return (error ? error : EINTR);
492 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
493 rabp->b_flags |= B_ASYNC;
494 rabp->b_iocmd = BIO_READ;
495 vfs_busy_pages(rabp, 0);
496 if (nfs_asyncio(nmp, rabp, cred, td)) {
497 rabp->b_flags |= B_INVAL;
498 rabp->b_ioflags |= BIO_ERROR;
499 vfs_unbusy_pages(rabp);
510 /* Note that bcount is *not* DEV_BSIZE aligned. */
512 if ((off_t)lbn * biosize >= nsize) {
514 } else if ((off_t)(lbn + 1) * biosize > nsize) {
515 bcount = nsize - (off_t)lbn * biosize;
517 bp = nfs_getcacheblk(vp, lbn, bcount, td);
520 error = nfs_sigintr(nmp, td);
521 return (error ? error : EINTR);
525 * If B_CACHE is not set, we must issue the read. If this
526 * fails, we return an error.
529 if ((bp->b_flags & B_CACHE) == 0) {
530 bp->b_iocmd = BIO_READ;
531 vfs_busy_pages(bp, 0);
532 error = nfs_doio(vp, bp, cred, td);
540 * on is the offset into the current bp. Figure out how many
541 * bytes we can copy out of the bp. Note that bcount is
542 * NOT DEV_BSIZE aligned.
544 * Then figure out how many bytes we can copy into the uio.
549 n = MIN((unsigned)(bcount - on), uio->uio_resid);
552 nfsstats.biocache_readlinks++;
553 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, td);
555 error = nfs_sigintr(nmp, td);
556 return (error ? error : EINTR);
558 if ((bp->b_flags & B_CACHE) == 0) {
559 bp->b_iocmd = BIO_READ;
560 vfs_busy_pages(bp, 0);
561 error = nfs_doio(vp, bp, cred, td);
563 bp->b_ioflags |= BIO_ERROR;
568 n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
572 nfsstats.biocache_readdirs++;
573 if (np->n_direofoffset
574 && uio->uio_offset >= np->n_direofoffset) {
577 lbn = (uoff_t)uio->uio_offset / NFS_DIRBLKSIZ;
578 on = uio->uio_offset & (NFS_DIRBLKSIZ - 1);
579 bp = nfs_getcacheblk(vp, lbn, NFS_DIRBLKSIZ, td);
581 error = nfs_sigintr(nmp, td);
582 return (error ? error : EINTR);
584 if ((bp->b_flags & B_CACHE) == 0) {
585 bp->b_iocmd = BIO_READ;
586 vfs_busy_pages(bp, 0);
587 error = nfs_doio(vp, bp, cred, td);
591 while (error == NFSERR_BAD_COOKIE) {
592 (nmp->nm_rpcops->nr_invaldir)(vp);
593 error = nfs_vinvalbuf(vp, 0, td, 1);
595 * Yuck! The directory has been modified on the
596 * server. The only way to get the block is by
597 * reading from the beginning to get all the
600 * Leave the last bp intact unless there is an error.
601 * Loop back up to the while if the error is another
602 * NFSERR_BAD_COOKIE (double yuch!).
604 for (i = 0; i <= lbn && !error; i++) {
605 if (np->n_direofoffset
606 && (i * NFS_DIRBLKSIZ) >= np->n_direofoffset)
608 bp = nfs_getcacheblk(vp, i, NFS_DIRBLKSIZ, td);
610 error = nfs_sigintr(nmp, td);
611 return (error ? error : EINTR);
613 if ((bp->b_flags & B_CACHE) == 0) {
614 bp->b_iocmd = BIO_READ;
615 vfs_busy_pages(bp, 0);
616 error = nfs_doio(vp, bp, cred, td);
618 * no error + B_INVAL == directory EOF,
621 if (error == 0 && (bp->b_flags & B_INVAL))
625 * An error will throw away the block and the
626 * for loop will break out. If no error and this
627 * is not the block we want, we throw away the
628 * block and go for the next one via the for loop.
630 if (error || i < lbn)
635 * The above while is repeated if we hit another cookie
636 * error. If we hit an error and it wasn't a cookie error,
644 * If not eof and read aheads are enabled, start one.
645 * (You need the current block first, so that you have the
646 * directory offset cookie of the next block.)
648 if (nmp->nm_readahead > 0 &&
649 (bp->b_flags & B_INVAL) == 0 &&
650 (np->n_direofoffset == 0 ||
651 (lbn + 1) * NFS_DIRBLKSIZ < np->n_direofoffset) &&
652 incore(&vp->v_bufobj, lbn + 1) == NULL) {
653 rabp = nfs_getcacheblk(vp, lbn + 1, NFS_DIRBLKSIZ, td);
655 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
656 rabp->b_flags |= B_ASYNC;
657 rabp->b_iocmd = BIO_READ;
658 vfs_busy_pages(rabp, 0);
659 if (nfs_asyncio(nmp, rabp, cred, td)) {
660 rabp->b_flags |= B_INVAL;
661 rabp->b_ioflags |= BIO_ERROR;
662 vfs_unbusy_pages(rabp);
671 * Unlike VREG files, whos buffer size ( bp->b_bcount ) is
672 * chopped for the EOF condition, we cannot tell how large
673 * NFS directories are going to be until we hit EOF. So
674 * an NFS directory buffer is *not* chopped to its EOF. Now,
675 * it just so happens that b_resid will effectively chop it
676 * to EOF. *BUT* this information is lost if the buffer goes
677 * away and is reconstituted into a B_CACHE state ( due to
678 * being VMIO ) later. So we keep track of the directory eof
679 * in np->n_direofoffset and chop it off as an extra step
682 n = lmin(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid - on);
683 if (np->n_direofoffset && n > np->n_direofoffset - uio->uio_offset)
684 n = np->n_direofoffset - uio->uio_offset;
687 nfs_printf(" nfs_bioread: type %x unexpected\n", vp->v_type);
693 error = uiomove(bp->b_data + on, (int)n, uio);
695 if (vp->v_type == VLNK)
699 } while (error == 0 && uio->uio_resid > 0 && n > 0);
704 * The NFS write path cannot handle iovecs with len > 1. So we need to
705 * break up iovecs accordingly (restricting them to wsize).
706 * For the SYNC case, we can do this with 1 copy (user buffer -> mbuf).
707 * For the ASYNC case, 2 copies are needed. The first a copy from the
708 * user buffer to a staging buffer and then a second copy from the staging
709 * buffer to mbufs. This can be optimized by copying from the user buffer
710 * directly into mbufs and passing the chain down, but that requires a
711 * fair amount of re-working of the relevant codepaths (and can be done
715 nfs_directio_write(vp, uiop, cred, ioflag)
722 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
723 struct thread *td = uiop->uio_td;
727 mtx_lock(&nmp->nm_mtx);
728 wsize = nmp->nm_wsize;
729 mtx_unlock(&nmp->nm_mtx);
730 if (ioflag & IO_SYNC) {
731 int iomode, must_commit;
735 while (uiop->uio_resid > 0) {
736 size = MIN(uiop->uio_resid, wsize);
737 size = MIN(uiop->uio_iov->iov_len, size);
738 iov.iov_base = uiop->uio_iov->iov_base;
742 uio.uio_offset = uiop->uio_offset;
743 uio.uio_resid = size;
744 uio.uio_segflg = UIO_USERSPACE;
745 uio.uio_rw = UIO_WRITE;
747 iomode = NFSV3WRITE_FILESYNC;
748 error = (nmp->nm_rpcops->nr_writerpc)(vp, &uio, cred,
749 &iomode, &must_commit);
750 KASSERT((must_commit == 0),
751 ("nfs_directio_write: Did not commit write"));
754 uiop->uio_offset += size;
755 uiop->uio_resid -= size;
756 if (uiop->uio_iov->iov_len <= size) {
760 uiop->uio_iov->iov_base =
761 (char *)uiop->uio_iov->iov_base + size;
762 uiop->uio_iov->iov_len -= size;
771 * Break up the write into blocksize chunks and hand these
772 * over to nfsiod's for write back.
773 * Unfortunately, this incurs a copy of the data. Since
774 * the user could modify the buffer before the write is
777 * The obvious optimization here is that one of the 2 copies
778 * in the async write path can be eliminated by copying the
779 * data here directly into mbufs and passing the mbuf chain
780 * down. But that will require a fair amount of re-working
781 * of the code and can be done if there's enough interest
782 * in NFS directio access.
784 while (uiop->uio_resid > 0) {
785 size = MIN(uiop->uio_resid, wsize);
786 size = MIN(uiop->uio_iov->iov_len, size);
787 bp = getpbuf(&nfs_pbuf_freecnt);
788 t_uio = malloc(sizeof(struct uio), M_NFSDIRECTIO, M_WAITOK);
789 t_iov = malloc(sizeof(struct iovec), M_NFSDIRECTIO, M_WAITOK);
790 t_iov->iov_base = malloc(size, M_NFSDIRECTIO, M_WAITOK);
791 t_iov->iov_len = size;
792 t_uio->uio_iov = t_iov;
793 t_uio->uio_iovcnt = 1;
794 t_uio->uio_offset = uiop->uio_offset;
795 t_uio->uio_resid = size;
796 t_uio->uio_segflg = UIO_SYSSPACE;
797 t_uio->uio_rw = UIO_WRITE;
799 KASSERT(uiop->uio_segflg == UIO_USERSPACE ||
800 uiop->uio_segflg == UIO_SYSSPACE,
801 ("nfs_directio_write: Bad uio_segflg"));
802 if (uiop->uio_segflg == UIO_USERSPACE) {
803 error = copyin(uiop->uio_iov->iov_base,
804 t_iov->iov_base, size);
809 * UIO_SYSSPACE may never happen, but handle
810 * it just in case it does.
812 bcopy(uiop->uio_iov->iov_base, t_iov->iov_base,
814 bp->b_flags |= B_DIRECT;
815 bp->b_iocmd = BIO_WRITE;
816 if (cred != NOCRED) {
820 bp->b_wcred = NOCRED;
821 bp->b_caller1 = (void *)t_uio;
823 error = nfs_asyncio(nmp, bp, NOCRED, td);
826 free(t_iov->iov_base, M_NFSDIRECTIO);
827 free(t_iov, M_NFSDIRECTIO);
828 free(t_uio, M_NFSDIRECTIO);
830 relpbuf(bp, &nfs_pbuf_freecnt);
835 uiop->uio_offset += size;
836 uiop->uio_resid -= size;
837 if (uiop->uio_iov->iov_len <= size) {
841 uiop->uio_iov->iov_base =
842 (char *)uiop->uio_iov->iov_base + size;
843 uiop->uio_iov->iov_len -= size;
851 * Vnode op for write using bio
854 nfs_write(struct vop_write_args *ap)
857 struct uio *uio = ap->a_uio;
858 struct thread *td = uio->uio_td;
859 struct vnode *vp = ap->a_vp;
860 struct nfsnode *np = VTONFS(vp);
861 struct ucred *cred = ap->a_cred;
862 int ioflag = ap->a_ioflag;
865 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
869 int n, on, error = 0;
871 KASSERT(uio->uio_rw == UIO_WRITE, ("nfs_write mode"));
872 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
874 if (vp->v_type != VREG)
876 mtx_lock(&np->n_mtx);
877 if (np->n_flag & NWRITEERR) {
878 np->n_flag &= ~NWRITEERR;
879 mtx_unlock(&np->n_mtx);
880 return (np->n_error);
882 mtx_unlock(&np->n_mtx);
883 mtx_lock(&nmp->nm_mtx);
884 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
885 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
886 mtx_unlock(&nmp->nm_mtx);
887 (void)nfs_fsinfo(nmp, vp, cred, td);
889 mtx_unlock(&nmp->nm_mtx);
892 * Synchronously flush pending buffers if we are in synchronous
893 * mode or if we are appending.
895 if (ioflag & (IO_APPEND | IO_SYNC)) {
896 mtx_lock(&np->n_mtx);
897 if (np->n_flag & NMODIFIED) {
898 mtx_unlock(&np->n_mtx);
899 #ifdef notyet /* Needs matching nonblock semantics elsewhere, too. */
901 * Require non-blocking, synchronous writes to
902 * dirty files to inform the program it needs
903 * to fsync(2) explicitly.
905 if (ioflag & IO_NDELAY)
910 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
911 error = nfs_vinvalbuf(vp, V_SAVE, td, 1);
915 mtx_unlock(&np->n_mtx);
919 * If IO_APPEND then load uio_offset. We restart here if we cannot
920 * get the append lock.
922 if (ioflag & IO_APPEND) {
924 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
925 error = VOP_GETATTR(vp, &vattr, cred);
928 mtx_lock(&np->n_mtx);
929 uio->uio_offset = np->n_size;
930 mtx_unlock(&np->n_mtx);
933 if (uio->uio_offset < 0)
935 end = uio->uio_offset + uio->uio_resid;
936 if (end > nmp->nm_maxfilesize || end < uio->uio_offset)
938 if (uio->uio_resid == 0)
941 if (nfs_directio_enable && (ioflag & IO_DIRECT) && vp->v_type == VREG)
942 return nfs_directio_write(vp, uio, cred, ioflag);
945 * Maybe this should be above the vnode op call, but so long as
946 * file servers have no limits, i don't think it matters
948 if (vn_rlimit_fsize(vp, uio, td))
951 biosize = vp->v_bufobj.bo_bsize;
953 * Find all of this file's B_NEEDCOMMIT buffers. If our writes
954 * would exceed the local maximum per-file write commit size when
955 * combined with those, we must decide whether to flush,
956 * go synchronous, or return error. We don't bother checking
957 * IO_UNIT -- we just make all writes atomic anyway, as there's
958 * no point optimizing for something that really won't ever happen.
960 if (!(ioflag & IO_SYNC)) {
963 mtx_lock(&np->n_mtx);
965 mtx_unlock(&np->n_mtx);
967 if (nmp->nm_wcommitsize < uio->uio_resid) {
969 * If this request could not possibly be completed
970 * without exceeding the maximum outstanding write
971 * commit size, see if we can convert it into a
972 * synchronous write operation.
974 if (ioflag & IO_NDELAY)
977 if (nflag & NMODIFIED)
979 } else if (nflag & NMODIFIED) {
981 BO_LOCK(&vp->v_bufobj);
982 if (vp->v_bufobj.bo_dirty.bv_cnt != 0) {
983 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd,
985 if (bp->b_flags & B_NEEDCOMMIT)
986 wouldcommit += bp->b_bcount;
989 BO_UNLOCK(&vp->v_bufobj);
991 * Since we're not operating synchronously and
992 * bypassing the buffer cache, we are in a commit
993 * and holding all of these buffers whether
994 * transmitted or not. If not limited, this
995 * will lead to the buffer cache deadlocking,
996 * as no one else can flush our uncommitted buffers.
998 wouldcommit += uio->uio_resid;
1000 * If we would initially exceed the maximum
1001 * outstanding write commit size, flush and restart.
1003 if (wouldcommit > nmp->nm_wcommitsize)
1007 goto flush_and_restart;
1011 nfsstats.biocache_writes++;
1012 lbn = uio->uio_offset / biosize;
1013 on = uio->uio_offset & (biosize-1);
1014 n = MIN((unsigned)(biosize - on), uio->uio_resid);
1017 * Handle direct append and file extension cases, calculate
1018 * unaligned buffer size.
1020 mtx_lock(&np->n_mtx);
1021 if (uio->uio_offset == np->n_size && n) {
1022 mtx_unlock(&np->n_mtx);
1024 * Get the buffer (in its pre-append state to maintain
1025 * B_CACHE if it was previously set). Resize the
1026 * nfsnode after we have locked the buffer to prevent
1027 * readers from reading garbage.
1030 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1035 mtx_lock(&np->n_mtx);
1036 np->n_size = uio->uio_offset + n;
1037 np->n_flag |= NMODIFIED;
1038 vnode_pager_setsize(vp, np->n_size);
1039 mtx_unlock(&np->n_mtx);
1041 save = bp->b_flags & B_CACHE;
1043 allocbuf(bp, bcount);
1044 bp->b_flags |= save;
1048 * Obtain the locked cache block first, and then
1049 * adjust the file's size as appropriate.
1052 if ((off_t)lbn * biosize + bcount < np->n_size) {
1053 if ((off_t)(lbn + 1) * biosize < np->n_size)
1056 bcount = np->n_size - (off_t)lbn * biosize;
1058 mtx_unlock(&np->n_mtx);
1059 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1060 mtx_lock(&np->n_mtx);
1061 if (uio->uio_offset + n > np->n_size) {
1062 np->n_size = uio->uio_offset + n;
1063 np->n_flag |= NMODIFIED;
1064 vnode_pager_setsize(vp, np->n_size);
1066 mtx_unlock(&np->n_mtx);
1070 error = nfs_sigintr(nmp, td);
1077 * Issue a READ if B_CACHE is not set. In special-append
1078 * mode, B_CACHE is based on the buffer prior to the write
1079 * op and is typically set, avoiding the read. If a read
1080 * is required in special append mode, the server will
1081 * probably send us a short-read since we extended the file
1082 * on our end, resulting in b_resid == 0 and, thusly,
1083 * B_CACHE getting set.
1085 * We can also avoid issuing the read if the write covers
1086 * the entire buffer. We have to make sure the buffer state
1087 * is reasonable in this case since we will not be initiating
1088 * I/O. See the comments in kern/vfs_bio.c's getblk() for
1091 * B_CACHE may also be set due to the buffer being cached
1095 if (on == 0 && n == bcount) {
1096 bp->b_flags |= B_CACHE;
1097 bp->b_flags &= ~B_INVAL;
1098 bp->b_ioflags &= ~BIO_ERROR;
1101 if ((bp->b_flags & B_CACHE) == 0) {
1102 bp->b_iocmd = BIO_READ;
1103 vfs_busy_pages(bp, 0);
1104 error = nfs_doio(vp, bp, cred, td);
1110 if (bp->b_wcred == NOCRED)
1111 bp->b_wcred = crhold(cred);
1112 mtx_lock(&np->n_mtx);
1113 np->n_flag |= NMODIFIED;
1114 mtx_unlock(&np->n_mtx);
1117 * If dirtyend exceeds file size, chop it down. This should
1118 * not normally occur but there is an append race where it
1119 * might occur XXX, so we log it.
1121 * If the chopping creates a reverse-indexed or degenerate
1122 * situation with dirtyoff/end, we 0 both of them.
1125 if (bp->b_dirtyend > bcount) {
1126 nfs_printf("NFS append race @%lx:%d\n",
1127 (long)bp->b_blkno * DEV_BSIZE,
1128 bp->b_dirtyend - bcount);
1129 bp->b_dirtyend = bcount;
1132 if (bp->b_dirtyoff >= bp->b_dirtyend)
1133 bp->b_dirtyoff = bp->b_dirtyend = 0;
1136 * If the new write will leave a contiguous dirty
1137 * area, just update the b_dirtyoff and b_dirtyend,
1138 * otherwise force a write rpc of the old dirty area.
1140 * While it is possible to merge discontiguous writes due to
1141 * our having a B_CACHE buffer ( and thus valid read data
1142 * for the hole), we don't because it could lead to
1143 * significant cache coherency problems with multiple clients,
1144 * especially if locking is implemented later on.
1146 * as an optimization we could theoretically maintain
1147 * a linked list of discontinuous areas, but we would still
1148 * have to commit them separately so there isn't much
1149 * advantage to it except perhaps a bit of asynchronization.
1152 if (bp->b_dirtyend > 0 &&
1153 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
1154 if (bwrite(bp) == EINTR) {
1161 error = uiomove((char *)bp->b_data + on, n, uio);
1164 * Since this block is being modified, it must be written
1165 * again and not just committed. Since write clustering does
1166 * not work for the stage 1 data write, only the stage 2
1167 * commit rpc, we have to clear B_CLUSTEROK as well.
1169 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1172 bp->b_ioflags |= BIO_ERROR;
1178 * Only update dirtyoff/dirtyend if not a degenerate
1182 if (bp->b_dirtyend > 0) {
1183 bp->b_dirtyoff = min(on, bp->b_dirtyoff);
1184 bp->b_dirtyend = max((on + n), bp->b_dirtyend);
1186 bp->b_dirtyoff = on;
1187 bp->b_dirtyend = on + n;
1189 vfs_bio_set_valid(bp, on, n);
1193 * If IO_SYNC do bwrite().
1195 * IO_INVAL appears to be unused. The idea appears to be
1196 * to turn off caching in this case. Very odd. XXX
1198 if ((ioflag & IO_SYNC)) {
1199 if (ioflag & IO_INVAL)
1200 bp->b_flags |= B_NOCACHE;
1204 } else if ((n + on) == biosize) {
1205 bp->b_flags |= B_ASYNC;
1206 (void) (nmp->nm_rpcops->nr_writebp)(bp, 0, NULL);
1210 } while (uio->uio_resid > 0 && n > 0);
1216 * Get an nfs cache block.
1218 * Allocate a new one if the block isn't currently in the cache
1219 * and return the block marked busy. If the calling process is
1220 * interrupted by a signal for an interruptible mount point, return
1223 * The caller must carefully deal with the possible B_INVAL state of
1224 * the buffer. nfs_doio() clears B_INVAL (and nfs_asyncio() clears it
1225 * indirectly), so synchronous reads can be issued without worrying about
1226 * the B_INVAL state. We have to be a little more careful when dealing
1227 * with writes (see comments in nfs_write()) when extending a file past
1231 nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct thread *td)
1235 struct nfsmount *nmp;
1240 if (nmp->nm_flag & NFSMNT_INT) {
1243 nfs_set_sigmask(td, &oldset);
1244 bp = getblk(vp, bn, size, NFS_PCATCH, 0, 0);
1245 nfs_restore_sigmask(td, &oldset);
1246 while (bp == NULL) {
1247 if (nfs_sigintr(nmp, td))
1249 bp = getblk(vp, bn, size, 0, 2 * hz, 0);
1252 bp = getblk(vp, bn, size, 0, 0, 0);
1255 if (vp->v_type == VREG)
1256 bp->b_blkno = bn * (vp->v_bufobj.bo_bsize / DEV_BSIZE);
1261 * Flush and invalidate all dirty buffers. If another process is already
1262 * doing the flush, just wait for completion.
1265 nfs_vinvalbuf(struct vnode *vp, int flags, struct thread *td, int intrflg)
1267 struct nfsnode *np = VTONFS(vp);
1268 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1269 int error = 0, slpflag, slptimeo;
1272 ASSERT_VOP_LOCKED(vp, "nfs_vinvalbuf");
1274 if ((nmp->nm_flag & NFSMNT_INT) == 0)
1277 slpflag = NFS_PCATCH;
1284 old_lock = nfs_upgrade_vnlock(vp);
1285 if (vp->v_iflag & VI_DOOMED) {
1287 * Since vgonel() uses the generic vinvalbuf() to flush
1288 * dirty buffers and it does not call this function, it
1289 * is safe to just return OK when VI_DOOMED is set.
1291 nfs_downgrade_vnlock(vp, old_lock);
1296 * Now, flush as required.
1298 if ((flags & V_SAVE) && (vp->v_bufobj.bo_object != NULL)) {
1299 VM_OBJECT_LOCK(vp->v_bufobj.bo_object);
1300 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
1301 VM_OBJECT_UNLOCK(vp->v_bufobj.bo_object);
1303 * If the page clean was interrupted, fail the invalidation.
1304 * Not doing so, we run the risk of losing dirty pages in the
1305 * vinvalbuf() call below.
1307 if (intrflg && (error = nfs_sigintr(nmp, td)))
1311 error = vinvalbuf(vp, flags, slpflag, 0);
1313 if (intrflg && (error = nfs_sigintr(nmp, td)))
1315 error = vinvalbuf(vp, flags, 0, slptimeo);
1317 mtx_lock(&np->n_mtx);
1318 if (np->n_directio_asyncwr == 0)
1319 np->n_flag &= ~NMODIFIED;
1320 mtx_unlock(&np->n_mtx);
1322 nfs_downgrade_vnlock(vp, old_lock);
1327 * Initiate asynchronous I/O. Return an error if no nfsiods are available.
1328 * This is mainly to avoid queueing async I/O requests when the nfsiods
1329 * are all hung on a dead server.
1331 * Note: nfs_asyncio() does not clear (BIO_ERROR|B_INVAL) but when the bp
1332 * is eventually dequeued by the async daemon, nfs_doio() *will*.
1335 nfs_asyncio(struct nfsmount *nmp, struct buf *bp, struct ucred *cred, struct thread *td)
1344 * Commits are usually short and sweet so lets save some cpu and
1345 * leave the async daemons for more important rpc's (such as reads
1348 * Readdirplus RPCs do vget()s to acquire the vnodes for entries
1349 * in the directory in order to update attributes. This can deadlock
1350 * with another thread that is waiting for async I/O to be done by
1351 * an nfsiod thread while holding a lock on one of these vnodes.
1352 * To avoid this deadlock, don't allow the async nfsiod threads to
1353 * perform Readdirplus RPCs.
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 (bp->b_vp->v_type == VDIR && (nmp->nm_flag & NFSMNT_RDIRPLUS))) {
1359 mtx_unlock(&nfs_iod_mtx);
1363 if (nmp->nm_flag & NFSMNT_INT)
1364 slpflag = NFS_PCATCH;
1368 * Find a free iod to process this request.
1370 for (iod = 0; iod < nfs_numasync; iod++)
1371 if (nfs_iodwant[iod] == NFSIOD_AVAILABLE) {
1377 * Try to create one if none are free.
1383 * Found one, so wake it up and tell it which
1386 NFS_DPF(ASYNCIO, ("nfs_asyncio: waking iod %d for mount %p\n",
1388 nfs_iodwant[iod] = NFSIOD_NOT_AVAILABLE;
1389 nfs_iodmount[iod] = nmp;
1391 wakeup(&nfs_iodwant[iod]);
1395 * If none are free, we may already have an iod working on this mount
1396 * point. If so, it will process our request.
1399 if (nmp->nm_bufqiods > 0) {
1401 ("nfs_asyncio: %d iods are already processing mount %p\n",
1402 nmp->nm_bufqiods, nmp));
1408 * If we have an iod which can process the request, then queue
1413 * Ensure that the queue never grows too large. We still want
1414 * to asynchronize so we block rather then return EIO.
1416 while (nmp->nm_bufqlen >= 2 * nfs_numasync) {
1418 ("nfs_asyncio: waiting for mount %p queue to drain\n", nmp));
1419 nmp->nm_bufqwant = TRUE;
1420 error = nfs_msleep(td, &nmp->nm_bufq, &nfs_iod_mtx,
1422 "nfsaio", slptimeo);
1424 error2 = nfs_sigintr(nmp, td);
1426 mtx_unlock(&nfs_iod_mtx);
1429 if (slpflag == NFS_PCATCH) {
1435 * We might have lost our iod while sleeping,
1436 * so check and loop if nescessary.
1441 /* We might have lost our nfsiod */
1442 if (nmp->nm_bufqiods == 0) {
1444 ("nfs_asyncio: no iods after mount %p queue was drained, looping\n", nmp));
1448 if (bp->b_iocmd == BIO_READ) {
1449 if (bp->b_rcred == NOCRED && cred != NOCRED)
1450 bp->b_rcred = crhold(cred);
1452 if (bp->b_wcred == NOCRED && cred != NOCRED)
1453 bp->b_wcred = crhold(cred);
1456 if (bp->b_flags & B_REMFREE)
1459 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist);
1461 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1462 mtx_lock(&(VTONFS(bp->b_vp))->n_mtx);
1463 VTONFS(bp->b_vp)->n_flag |= NMODIFIED;
1464 VTONFS(bp->b_vp)->n_directio_asyncwr++;
1465 mtx_unlock(&(VTONFS(bp->b_vp))->n_mtx);
1467 mtx_unlock(&nfs_iod_mtx);
1471 mtx_unlock(&nfs_iod_mtx);
1474 * All the iods are busy on other mounts, so return EIO to
1475 * force the caller to process the i/o synchronously.
1477 NFS_DPF(ASYNCIO, ("nfs_asyncio: no iods available, i/o is synchronous\n"));
1482 nfs_doio_directwrite(struct buf *bp)
1484 int iomode, must_commit;
1485 struct uio *uiop = (struct uio *)bp->b_caller1;
1486 char *iov_base = uiop->uio_iov->iov_base;
1487 struct nfsmount *nmp = VFSTONFS(bp->b_vp->v_mount);
1489 iomode = NFSV3WRITE_FILESYNC;
1490 uiop->uio_td = NULL; /* NULL since we're in nfsiod */
1491 (nmp->nm_rpcops->nr_writerpc)(bp->b_vp, uiop, bp->b_wcred, &iomode, &must_commit);
1492 KASSERT((must_commit == 0), ("nfs_doio_directwrite: Did not commit write"));
1493 free(iov_base, M_NFSDIRECTIO);
1494 free(uiop->uio_iov, M_NFSDIRECTIO);
1495 free(uiop, M_NFSDIRECTIO);
1496 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1497 struct nfsnode *np = VTONFS(bp->b_vp);
1498 mtx_lock(&np->n_mtx);
1499 np->n_directio_asyncwr--;
1500 if (np->n_directio_asyncwr == 0) {
1501 VTONFS(bp->b_vp)->n_flag &= ~NMODIFIED;
1502 if ((np->n_flag & NFSYNCWAIT)) {
1503 np->n_flag &= ~NFSYNCWAIT;
1504 wakeup((caddr_t)&np->n_directio_asyncwr);
1507 mtx_unlock(&np->n_mtx);
1510 relpbuf(bp, &nfs_pbuf_freecnt);
1514 * Do an I/O operation to/from a cache block. This may be called
1515 * synchronously or from an nfsiod.
1518 nfs_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td)
1522 struct nfsmount *nmp;
1523 int error = 0, iomode, must_commit = 0;
1526 struct proc *p = td ? td->td_proc : NULL;
1530 nmp = VFSTONFS(vp->v_mount);
1532 uiop->uio_iov = &io;
1533 uiop->uio_iovcnt = 1;
1534 uiop->uio_segflg = UIO_SYSSPACE;
1538 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
1539 * do this here so we do not have to do it in all the code that
1542 bp->b_flags &= ~B_INVAL;
1543 bp->b_ioflags &= ~BIO_ERROR;
1545 KASSERT(!(bp->b_flags & B_DONE), ("nfs_doio: bp %p already marked done", bp));
1546 iocmd = bp->b_iocmd;
1547 if (iocmd == BIO_READ) {
1548 io.iov_len = uiop->uio_resid = bp->b_bcount;
1549 io.iov_base = bp->b_data;
1550 uiop->uio_rw = UIO_READ;
1552 switch (vp->v_type) {
1554 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
1555 nfsstats.read_bios++;
1556 error = (nmp->nm_rpcops->nr_readrpc)(vp, uiop, cr);
1559 if (uiop->uio_resid) {
1561 * If we had a short read with no error, we must have
1562 * hit a file hole. We should zero-fill the remainder.
1563 * This can also occur if the server hits the file EOF.
1565 * Holes used to be able to occur due to pending
1566 * writes, but that is not possible any longer.
1568 int nread = bp->b_bcount - uiop->uio_resid;
1569 int left = uiop->uio_resid;
1572 bzero((char *)bp->b_data + nread, left);
1573 uiop->uio_resid = 0;
1576 /* ASSERT_VOP_LOCKED(vp, "nfs_doio"); */
1577 if (p && (vp->v_vflag & VV_TEXT)) {
1578 mtx_lock(&np->n_mtx);
1579 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &np->n_vattr.va_mtime)) {
1580 mtx_unlock(&np->n_mtx);
1582 killproc(p, "text file modification");
1585 mtx_unlock(&np->n_mtx);
1589 uiop->uio_offset = (off_t)0;
1590 nfsstats.readlink_bios++;
1591 error = (nmp->nm_rpcops->nr_readlinkrpc)(vp, uiop, cr);
1594 nfsstats.readdir_bios++;
1595 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
1596 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) != 0) {
1597 error = nfs_readdirplusrpc(vp, uiop, cr);
1598 if (error == NFSERR_NOTSUPP)
1599 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
1601 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
1602 error = nfs_readdirrpc(vp, uiop, cr);
1604 * end-of-directory sets B_INVAL but does not generate an
1607 if (error == 0 && uiop->uio_resid == bp->b_bcount)
1608 bp->b_flags |= B_INVAL;
1611 nfs_printf("nfs_doio: type %x unexpected\n", vp->v_type);
1615 bp->b_ioflags |= BIO_ERROR;
1616 bp->b_error = error;
1620 * If we only need to commit, try to commit
1622 if (bp->b_flags & B_NEEDCOMMIT) {
1626 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
1627 retv = (nmp->nm_rpcops->nr_commit)(
1628 vp, off, bp->b_dirtyend-bp->b_dirtyoff,
1631 bp->b_dirtyoff = bp->b_dirtyend = 0;
1632 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1637 if (retv == NFSERR_STALEWRITEVERF) {
1638 nfs_clearcommit(vp->v_mount);
1643 * Setup for actual write
1645 mtx_lock(&np->n_mtx);
1646 if ((off_t)bp->b_blkno * DEV_BSIZE + bp->b_dirtyend > np->n_size)
1647 bp->b_dirtyend = np->n_size - (off_t)bp->b_blkno * DEV_BSIZE;
1648 mtx_unlock(&np->n_mtx);
1650 if (bp->b_dirtyend > bp->b_dirtyoff) {
1651 io.iov_len = uiop->uio_resid = bp->b_dirtyend
1653 uiop->uio_offset = (off_t)bp->b_blkno * DEV_BSIZE
1655 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
1656 uiop->uio_rw = UIO_WRITE;
1657 nfsstats.write_bios++;
1659 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC)
1660 iomode = NFSV3WRITE_UNSTABLE;
1662 iomode = NFSV3WRITE_FILESYNC;
1664 error = (nmp->nm_rpcops->nr_writerpc)(vp, uiop, cr, &iomode, &must_commit);
1667 * When setting B_NEEDCOMMIT also set B_CLUSTEROK to try
1668 * to cluster the buffers needing commit. This will allow
1669 * the system to submit a single commit rpc for the whole
1670 * cluster. We can do this even if the buffer is not 100%
1671 * dirty (relative to the NFS blocksize), so we optimize the
1672 * append-to-file-case.
1674 * (when clearing B_NEEDCOMMIT, B_CLUSTEROK must also be
1675 * cleared because write clustering only works for commit
1676 * rpc's, not for the data portion of the write).
1679 if (!error && iomode == NFSV3WRITE_UNSTABLE) {
1680 bp->b_flags |= B_NEEDCOMMIT;
1681 if (bp->b_dirtyoff == 0
1682 && bp->b_dirtyend == bp->b_bcount)
1683 bp->b_flags |= B_CLUSTEROK;
1685 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1689 * For an interrupted write, the buffer is still valid
1690 * and the write hasn't been pushed to the server yet,
1691 * so we can't set BIO_ERROR and report the interruption
1692 * by setting B_EINTR. For the B_ASYNC case, B_EINTR
1693 * is not relevant, so the rpc attempt is essentially
1694 * a noop. For the case of a V3 write rpc not being
1695 * committed to stable storage, the block is still
1696 * dirty and requires either a commit rpc or another
1697 * write rpc with iomode == NFSV3WRITE_FILESYNC before
1698 * the block is reused. This is indicated by setting
1699 * the B_DELWRI and B_NEEDCOMMIT flags.
1701 * If the buffer is marked B_PAGING, it does not reside on
1702 * the vp's paging queues so we cannot call bdirty(). The
1703 * bp in this case is not an NFS cache block so we should
1706 * The logic below breaks up errors into recoverable and
1707 * unrecoverable. For the former, we clear B_INVAL|B_NOCACHE
1708 * and keep the buffer around for potential write retries.
1709 * For the latter (eg ESTALE), we toss the buffer away (B_INVAL)
1710 * and save the error in the nfsnode. This is less than ideal
1711 * but necessary. Keeping such buffers around could potentially
1712 * cause buffer exhaustion eventually (they can never be written
1713 * out, so will get constantly be re-dirtied). It also causes
1714 * all sorts of vfs panics. For non-recoverable write errors,
1715 * also invalidate the attrcache, so we'll be forced to go over
1716 * the wire for this object, returning an error to user on next
1717 * call (most of the time).
1719 if (error == EINTR || error == EIO || error == ETIMEDOUT
1720 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
1724 bp->b_flags &= ~(B_INVAL|B_NOCACHE);
1725 if ((bp->b_flags & B_PAGING) == 0) {
1727 bp->b_flags &= ~B_DONE;
1729 if (error && (bp->b_flags & B_ASYNC) == 0)
1730 bp->b_flags |= B_EINTR;
1734 bp->b_ioflags |= BIO_ERROR;
1735 bp->b_flags |= B_INVAL;
1736 bp->b_error = np->n_error = error;
1737 mtx_lock(&np->n_mtx);
1738 np->n_flag |= NWRITEERR;
1739 np->n_attrstamp = 0;
1740 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1741 mtx_unlock(&np->n_mtx);
1743 bp->b_dirtyoff = bp->b_dirtyend = 0;
1751 bp->b_resid = uiop->uio_resid;
1753 nfs_clearcommit(vp->v_mount);
1759 * Used to aid in handling ftruncate() operations on the NFS client side.
1760 * Truncation creates a number of special problems for NFS. We have to
1761 * throw away VM pages and buffer cache buffers that are beyond EOF, and
1762 * we have to properly handle VM pages or (potentially dirty) buffers
1763 * that straddle the truncation point.
1767 nfs_meta_setsize(struct vnode *vp, struct ucred *cred, struct thread *td, u_quad_t nsize)
1769 struct nfsnode *np = VTONFS(vp);
1771 int biosize = vp->v_bufobj.bo_bsize;
1774 mtx_lock(&np->n_mtx);
1777 mtx_unlock(&np->n_mtx);
1779 if (nsize < tsize) {
1785 * vtruncbuf() doesn't get the buffer overlapping the
1786 * truncation point. We may have a B_DELWRI and/or B_CACHE
1787 * buffer that now needs to be truncated.
1789 error = vtruncbuf(vp, cred, td, nsize, biosize);
1790 lbn = nsize / biosize;
1791 bufsize = nsize & (biosize - 1);
1792 bp = nfs_getcacheblk(vp, lbn, bufsize, td);
1795 if (bp->b_dirtyoff > bp->b_bcount)
1796 bp->b_dirtyoff = bp->b_bcount;
1797 if (bp->b_dirtyend > bp->b_bcount)
1798 bp->b_dirtyend = bp->b_bcount;
1799 bp->b_flags |= B_RELBUF; /* don't leave garbage around */
1802 vnode_pager_setsize(vp, nsize);