2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)nfs_bio.c 8.9 (Berkeley) 3/30/95
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/mount.h>
46 #include <sys/rwlock.h>
47 #include <sys/vmmeter.h>
48 #include <sys/vnode.h>
51 #include <vm/vm_param.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 <fs/nfs/nfsport.h>
59 #include <fs/nfsclient/nfsmount.h>
60 #include <fs/nfsclient/nfs.h>
61 #include <fs/nfsclient/nfsnode.h>
62 #include <fs/nfsclient/nfs_kdtrace.h>
64 extern int newnfs_directio_allow_mmap;
65 extern struct nfsstatsv1 nfsstatsv1;
66 extern struct mtx ncl_iod_mutex;
67 extern int ncl_numasync;
68 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON];
69 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON];
70 extern int newnfs_directio_enable;
71 extern int nfs_keep_dirty_on_error;
73 uma_zone_t ncl_pbuf_zone;
75 static struct buf *nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size,
77 static int nfs_directio_write(struct vnode *vp, struct uio *uiop,
78 struct ucred *cred, int ioflag);
81 * Vnode op for VM getpages.
83 SYSCTL_DECL(_vfs_nfs);
84 static int use_buf_pager = 1;
85 SYSCTL_INT(_vfs_nfs, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN,
87 "Use buffer pager instead of direct readrpc call");
90 ncl_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
93 return (off / vp->v_bufobj.bo_bsize);
97 ncl_gbp_getblksz(struct vnode *vp, daddr_t lbn)
108 biosize = vp->v_bufobj.bo_bsize;
110 if ((off_t)lbn * biosize >= nsize)
112 else if ((off_t)(lbn + 1) * biosize > nsize)
113 bcount = nsize - (off_t)lbn * biosize;
118 ncl_getpages(struct vop_getpages_args *ap)
120 int i, error, nextoff, size, toff, count, npages;
128 struct nfsmount *nmp;
136 cred = curthread->td_ucred;
137 nmp = VFSTONFS(vp->v_mount);
139 npages = ap->a_count;
141 if ((object = vp->v_object) == NULL) {
142 printf("ncl_getpages: called with non-merged cache vnode\n");
143 return (VM_PAGER_ERROR);
146 if (newnfs_directio_enable && !newnfs_directio_allow_mmap) {
148 if ((np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
150 printf("ncl_getpages: called on non-cacheable vnode\n");
151 return (VM_PAGER_ERROR);
156 mtx_lock(&nmp->nm_mtx);
157 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
158 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
159 mtx_unlock(&nmp->nm_mtx);
160 /* We'll never get here for v4, because we always have fsinfo */
161 (void)ncl_fsinfo(nmp, vp, cred, td);
163 mtx_unlock(&nmp->nm_mtx);
166 return (vfs_bio_getpages(vp, pages, npages, ap->a_rbehind,
167 ap->a_rahead, ncl_gbp_getblkno, ncl_gbp_getblksz));
170 * If the requested page is partially valid, just return it and
171 * allow the pager to zero-out the blanks. Partially valid pages
172 * can only occur at the file EOF.
174 * XXXGL: is that true for NFS, where short read can occur???
176 VM_OBJECT_WLOCK(object);
177 if (!vm_page_none_valid(pages[npages - 1]) && --npages == 0)
179 VM_OBJECT_WUNLOCK(object);
182 * We use only the kva address for the buffer, but this is extremely
183 * convenient and fast.
185 bp = uma_zalloc(ncl_pbuf_zone, M_WAITOK);
187 kva = (vm_offset_t) bp->b_data;
188 pmap_qenter(kva, pages, npages);
189 VM_CNT_INC(v_vnodein);
190 VM_CNT_ADD(v_vnodepgsin, npages);
192 count = npages << PAGE_SHIFT;
193 iov.iov_base = (caddr_t) kva;
197 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
198 uio.uio_resid = count;
199 uio.uio_segflg = UIO_SYSSPACE;
200 uio.uio_rw = UIO_READ;
203 error = ncl_readrpc(vp, &uio, cred);
204 pmap_qremove(kva, npages);
206 uma_zfree(ncl_pbuf_zone, bp);
208 if (error && (uio.uio_resid == count)) {
209 printf("ncl_getpages: error %d\n", error);
210 return (VM_PAGER_ERROR);
214 * Calculate the number of bytes read and validate only that number
215 * of bytes. Note that due to pending writes, size may be 0. This
216 * does not mean that the remaining data is invalid!
219 size = count - uio.uio_resid;
220 VM_OBJECT_WLOCK(object);
221 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
223 nextoff = toff + PAGE_SIZE;
226 if (nextoff <= size) {
228 * Read operation filled an entire page
231 KASSERT(m->dirty == 0,
232 ("nfs_getpages: page %p is dirty", m));
233 } else if (size > toff) {
235 * Read operation filled a partial page.
238 vm_page_set_valid_range(m, 0, size - toff);
239 KASSERT(m->dirty == 0,
240 ("nfs_getpages: page %p is dirty", m));
243 * Read operation was short. If no error
244 * occurred we may have hit a zero-fill
245 * section. We leave valid set to 0, and page
246 * is freed by vm_page_readahead_finish() if
247 * its index is not equal to requested, or
248 * page is zeroed and set valid by
249 * vm_pager_get_pages() for requested page.
255 VM_OBJECT_WUNLOCK(object);
260 return (VM_PAGER_OK);
264 * Vnode op for VM putpages.
267 ncl_putpages(struct vop_putpages_args *ap)
271 int i, error, npages, count;
277 struct nfsmount *nmp;
283 td = curthread; /* XXX */
284 /* Set the cred to n_writecred for the write rpcs. */
285 if (np->n_writecred != NULL)
286 cred = crhold(np->n_writecred);
288 cred = crhold(curthread->td_ucred); /* XXX */
289 nmp = VFSTONFS(vp->v_mount);
292 rtvals = ap->a_rtvals;
293 npages = btoc(count);
294 offset = IDX_TO_OFF(pages[0]->pindex);
296 mtx_lock(&nmp->nm_mtx);
297 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
298 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
299 mtx_unlock(&nmp->nm_mtx);
300 (void)ncl_fsinfo(nmp, vp, cred, td);
302 mtx_unlock(&nmp->nm_mtx);
305 if (newnfs_directio_enable && !newnfs_directio_allow_mmap &&
306 (np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
308 printf("ncl_putpages: called on noncache-able vnode\n");
312 * When putting pages, do not extend file past EOF.
314 if (offset + count > np->n_size) {
315 count = np->n_size - offset;
321 for (i = 0; i < npages; i++)
322 rtvals[i] = VM_PAGER_ERROR;
324 VM_CNT_INC(v_vnodeout);
325 VM_CNT_ADD(v_vnodepgsout, count);
327 iov.iov_base = unmapped_buf;
331 uio.uio_offset = offset;
332 uio.uio_resid = count;
333 uio.uio_segflg = UIO_NOCOPY;
334 uio.uio_rw = UIO_WRITE;
337 error = VOP_WRITE(vp, &uio, vnode_pager_putpages_ioflags(ap->a_sync),
341 if (error == 0 || !nfs_keep_dirty_on_error) {
342 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid,
343 np->n_size - offset, npages * PAGE_SIZE);
349 * For nfs, cache consistency can only be maintained approximately.
350 * Although RFC1094 does not specify the criteria, the following is
351 * believed to be compatible with the reference port.
353 * If the file's modify time on the server has changed since the
354 * last read rpc or you have written to the file,
355 * you may have lost data cache consistency with the
356 * server, so flush all of the file's data out of the cache.
357 * Then force a getattr rpc to ensure that you have up to date
359 * NB: This implies that cache data can be read when up to
360 * NFS_ATTRTIMEO seconds out of date. If you find that you need current
361 * attributes this could be forced by setting n_attrstamp to 0 before
362 * the VOP_GETATTR() call.
365 nfs_bioread_check_cons(struct vnode *vp, struct thread *td, struct ucred *cred)
369 struct nfsnode *np = VTONFS(vp);
373 * Ensure the exclusove access to the node before checking
374 * whether the cache is consistent.
376 old_lock = ncl_excl_start(vp);
378 if (np->n_flag & NMODIFIED) {
380 if (vp->v_type != VREG) {
381 if (vp->v_type != VDIR)
382 panic("nfs: bioread, not dir");
384 error = ncl_vinvalbuf(vp, V_SAVE | V_ALLOWCLEAN, td, 1);
389 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
390 error = VOP_GETATTR(vp, &vattr, cred);
394 np->n_mtime = vattr.va_mtime;
398 error = VOP_GETATTR(vp, &vattr, cred);
402 if ((np->n_flag & NSIZECHANGED)
403 || (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime))) {
405 if (vp->v_type == VDIR)
407 error = ncl_vinvalbuf(vp, V_SAVE | V_ALLOWCLEAN, td, 1);
411 np->n_mtime = vattr.va_mtime;
412 np->n_flag &= ~NSIZECHANGED;
417 ncl_excl_finish(vp, old_lock);
422 * Vnode op for read using bio
425 ncl_bioread(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred)
427 struct nfsnode *np = VTONFS(vp);
428 struct buf *bp, *rabp;
430 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
432 int biosize, bcount, error, i, n, nra, on, save2, seqcount;
435 KASSERT(uio->uio_rw == UIO_READ, ("ncl_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)ncl_fsinfo(nmp, vp, cred, td);
447 mtx_lock(&nmp->nm_mtx);
449 if (nmp->nm_rsize == 0 || nmp->nm_readdirsize == 0)
450 (void) newnfs_iosize(nmp);
452 tmp_off = uio->uio_offset + uio->uio_resid;
453 if (vp->v_type != VDIR &&
454 (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)) {
455 mtx_unlock(&nmp->nm_mtx);
458 mtx_unlock(&nmp->nm_mtx);
460 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && (vp->v_type == VREG))
461 /* No caching/ no readaheads. Just read data into the user buffer */
462 return ncl_readrpc(vp, uio, cred);
466 biosize = vp->v_bufobj.bo_bsize;
467 seqcount = (int)((off_t)(ioflag >> IO_SEQSHIFT) * biosize / BKVASIZE);
469 error = nfs_bioread_check_cons(vp, td, cred);
473 save2 = curthread_pflags2_set(TDP2_SBPAGES);
481 switch (vp->v_type) {
483 NFSINCRGLOBAL(nfsstatsv1.biocache_reads);
484 lbn = uio->uio_offset / biosize;
485 on = uio->uio_offset - (lbn * biosize);
488 * Start the read ahead(s), as required.
490 if (nmp->nm_readahead > 0) {
491 for (nra = 0; nra < nmp->nm_readahead && nra < seqcount &&
492 (off_t)(lbn + 1 + nra) * biosize < nsize; nra++) {
493 rabn = lbn + 1 + nra;
494 if (incore(&vp->v_bufobj, rabn) == NULL) {
495 rabp = nfs_getcacheblk(vp, rabn, biosize, td);
497 error = newnfs_sigintr(nmp, td);
502 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
503 rabp->b_flags |= B_ASYNC;
504 rabp->b_iocmd = BIO_READ;
505 vfs_busy_pages(rabp, 0);
506 if (ncl_asyncio(nmp, rabp, cred, td)) {
507 rabp->b_flags |= B_INVAL;
508 rabp->b_ioflags |= BIO_ERROR;
509 vfs_unbusy_pages(rabp);
520 /* Note that bcount is *not* DEV_BSIZE aligned. */
522 if ((off_t)lbn * biosize >= nsize) {
524 } else if ((off_t)(lbn + 1) * biosize > nsize) {
525 bcount = nsize - (off_t)lbn * biosize;
527 bp = nfs_getcacheblk(vp, lbn, bcount, td);
530 error = newnfs_sigintr(nmp, td);
537 * If B_CACHE is not set, we must issue the read. If this
538 * fails, we return an error.
541 if ((bp->b_flags & B_CACHE) == 0) {
542 bp->b_iocmd = BIO_READ;
543 vfs_busy_pages(bp, 0);
544 error = ncl_doio(vp, bp, cred, td, 0);
552 * on is the offset into the current bp. Figure out how many
553 * bytes we can copy out of the bp. Note that bcount is
554 * NOT DEV_BSIZE aligned.
556 * Then figure out how many bytes we can copy into the uio.
561 n = MIN((unsigned)(bcount - on), uio->uio_resid);
564 NFSINCRGLOBAL(nfsstatsv1.biocache_readlinks);
565 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, td);
567 error = newnfs_sigintr(nmp, td);
572 if ((bp->b_flags & B_CACHE) == 0) {
573 bp->b_iocmd = BIO_READ;
574 vfs_busy_pages(bp, 0);
575 error = ncl_doio(vp, bp, cred, td, 0);
577 bp->b_ioflags |= BIO_ERROR;
582 n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
586 NFSINCRGLOBAL(nfsstatsv1.biocache_readdirs);
588 if (np->n_direofoffset
589 && uio->uio_offset >= np->n_direofoffset) {
595 lbn = (uoff_t)uio->uio_offset / NFS_DIRBLKSIZ;
596 on = uio->uio_offset & (NFS_DIRBLKSIZ - 1);
597 bp = nfs_getcacheblk(vp, lbn, NFS_DIRBLKSIZ, td);
599 error = newnfs_sigintr(nmp, td);
604 if ((bp->b_flags & B_CACHE) == 0) {
605 bp->b_iocmd = BIO_READ;
606 vfs_busy_pages(bp, 0);
607 error = ncl_doio(vp, bp, cred, td, 0);
611 while (error == NFSERR_BAD_COOKIE) {
613 error = ncl_vinvalbuf(vp, 0, td, 1);
616 * Yuck! The directory has been modified on the
617 * server. The only way to get the block is by
618 * reading from the beginning to get all the
621 * Leave the last bp intact unless there is an error.
622 * Loop back up to the while if the error is another
623 * NFSERR_BAD_COOKIE (double yuch!).
625 for (i = 0; i <= lbn && !error; i++) {
627 if (np->n_direofoffset
628 && (i * NFS_DIRBLKSIZ) >= np->n_direofoffset) {
634 bp = nfs_getcacheblk(vp, i, NFS_DIRBLKSIZ, td);
636 error = newnfs_sigintr(nmp, td);
641 if ((bp->b_flags & B_CACHE) == 0) {
642 bp->b_iocmd = BIO_READ;
643 vfs_busy_pages(bp, 0);
644 error = ncl_doio(vp, bp, cred, td, 0);
646 * no error + B_INVAL == directory EOF,
649 if (error == 0 && (bp->b_flags & B_INVAL))
653 * An error will throw away the block and the
654 * for loop will break out. If no error and this
655 * is not the block we want, we throw away the
656 * block and go for the next one via the for loop.
658 if (error || i < lbn)
663 * The above while is repeated if we hit another cookie
664 * error. If we hit an error and it wasn't a cookie error,
672 * If not eof and read aheads are enabled, start one.
673 * (You need the current block first, so that you have the
674 * directory offset cookie of the next block.)
677 if (nmp->nm_readahead > 0 &&
678 (bp->b_flags & B_INVAL) == 0 &&
679 (np->n_direofoffset == 0 ||
680 (lbn + 1) * NFS_DIRBLKSIZ < np->n_direofoffset) &&
681 incore(&vp->v_bufobj, lbn + 1) == NULL) {
683 rabp = nfs_getcacheblk(vp, lbn + 1, NFS_DIRBLKSIZ, td);
685 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
686 rabp->b_flags |= B_ASYNC;
687 rabp->b_iocmd = BIO_READ;
688 vfs_busy_pages(rabp, 0);
689 if (ncl_asyncio(nmp, rabp, cred, td)) {
690 rabp->b_flags |= B_INVAL;
691 rabp->b_ioflags |= BIO_ERROR;
692 vfs_unbusy_pages(rabp);
702 * Unlike VREG files, whos buffer size ( bp->b_bcount ) is
703 * chopped for the EOF condition, we cannot tell how large
704 * NFS directories are going to be until we hit EOF. So
705 * an NFS directory buffer is *not* chopped to its EOF. Now,
706 * it just so happens that b_resid will effectively chop it
707 * to EOF. *BUT* this information is lost if the buffer goes
708 * away and is reconstituted into a B_CACHE state ( due to
709 * being VMIO ) later. So we keep track of the directory eof
710 * in np->n_direofoffset and chop it off as an extra step
713 n = lmin(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid - on);
714 if (np->n_direofoffset && n > np->n_direofoffset - uio->uio_offset)
715 n = np->n_direofoffset - uio->uio_offset;
719 printf(" ncl_bioread: type %x unexpected\n", vp->v_type);
725 error = vn_io_fault_uiomove(bp->b_data + on, (int)n, uio);
727 if (vp->v_type == VLNK)
731 } while (error == 0 && uio->uio_resid > 0 && n > 0);
733 curthread_pflags2_restore(save2);
734 if ((curthread->td_pflags2 & TDP2_SBPAGES) == 0) {
736 ncl_pager_setsize(vp, NULL);
742 * The NFS write path cannot handle iovecs with len > 1. So we need to
743 * break up iovecs accordingly (restricting them to wsize).
744 * For the SYNC case, we can do this with 1 copy (user buffer -> mbuf).
745 * For the ASYNC case, 2 copies are needed. The first a copy from the
746 * user buffer to a staging buffer and then a second copy from the staging
747 * buffer to mbufs. This can be optimized by copying from the user buffer
748 * directly into mbufs and passing the chain down, but that requires a
749 * fair amount of re-working of the relevant codepaths (and can be done
753 nfs_directio_write(vp, uiop, cred, ioflag)
760 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
761 struct thread *td = uiop->uio_td;
765 mtx_lock(&nmp->nm_mtx);
766 wsize = nmp->nm_wsize;
767 mtx_unlock(&nmp->nm_mtx);
768 if (ioflag & IO_SYNC) {
769 int iomode, must_commit;
773 while (uiop->uio_resid > 0) {
774 size = MIN(uiop->uio_resid, wsize);
775 size = MIN(uiop->uio_iov->iov_len, size);
776 iov.iov_base = uiop->uio_iov->iov_base;
780 uio.uio_offset = uiop->uio_offset;
781 uio.uio_resid = size;
782 uio.uio_segflg = UIO_USERSPACE;
783 uio.uio_rw = UIO_WRITE;
785 iomode = NFSWRITE_FILESYNC;
786 error = ncl_writerpc(vp, &uio, cred, &iomode,
788 KASSERT((must_commit == 0),
789 ("ncl_directio_write: Did not commit write"));
792 uiop->uio_offset += size;
793 uiop->uio_resid -= size;
794 if (uiop->uio_iov->iov_len <= size) {
798 uiop->uio_iov->iov_base =
799 (char *)uiop->uio_iov->iov_base + size;
800 uiop->uio_iov->iov_len -= size;
809 * Break up the write into blocksize chunks and hand these
810 * over to nfsiod's for write back.
811 * Unfortunately, this incurs a copy of the data. Since
812 * the user could modify the buffer before the write is
815 * The obvious optimization here is that one of the 2 copies
816 * in the async write path can be eliminated by copying the
817 * data here directly into mbufs and passing the mbuf chain
818 * down. But that will require a fair amount of re-working
819 * of the code and can be done if there's enough interest
820 * in NFS directio access.
822 while (uiop->uio_resid > 0) {
823 size = MIN(uiop->uio_resid, wsize);
824 size = MIN(uiop->uio_iov->iov_len, size);
825 bp = uma_zalloc(ncl_pbuf_zone, M_WAITOK);
826 t_uio = malloc(sizeof(struct uio), M_NFSDIRECTIO, M_WAITOK);
827 t_iov = malloc(sizeof(struct iovec), M_NFSDIRECTIO, M_WAITOK);
828 t_iov->iov_base = malloc(size, M_NFSDIRECTIO, M_WAITOK);
829 t_iov->iov_len = size;
830 t_uio->uio_iov = t_iov;
831 t_uio->uio_iovcnt = 1;
832 t_uio->uio_offset = uiop->uio_offset;
833 t_uio->uio_resid = size;
834 t_uio->uio_segflg = UIO_SYSSPACE;
835 t_uio->uio_rw = UIO_WRITE;
837 KASSERT(uiop->uio_segflg == UIO_USERSPACE ||
838 uiop->uio_segflg == UIO_SYSSPACE,
839 ("nfs_directio_write: Bad uio_segflg"));
840 if (uiop->uio_segflg == UIO_USERSPACE) {
841 error = copyin(uiop->uio_iov->iov_base,
842 t_iov->iov_base, size);
847 * UIO_SYSSPACE may never happen, but handle
848 * it just in case it does.
850 bcopy(uiop->uio_iov->iov_base, t_iov->iov_base,
852 bp->b_flags |= B_DIRECT;
853 bp->b_iocmd = BIO_WRITE;
854 if (cred != NOCRED) {
858 bp->b_wcred = NOCRED;
859 bp->b_caller1 = (void *)t_uio;
861 error = ncl_asyncio(nmp, bp, NOCRED, td);
864 free(t_iov->iov_base, M_NFSDIRECTIO);
865 free(t_iov, M_NFSDIRECTIO);
866 free(t_uio, M_NFSDIRECTIO);
868 uma_zfree(ncl_pbuf_zone, bp);
873 uiop->uio_offset += size;
874 uiop->uio_resid -= size;
875 if (uiop->uio_iov->iov_len <= size) {
879 uiop->uio_iov->iov_base =
880 (char *)uiop->uio_iov->iov_base + size;
881 uiop->uio_iov->iov_len -= size;
889 * Vnode op for write using bio
892 ncl_write(struct vop_write_args *ap)
895 struct uio *uio = ap->a_uio;
896 struct thread *td = uio->uio_td;
897 struct vnode *vp = ap->a_vp;
898 struct nfsnode *np = VTONFS(vp);
899 struct ucred *cred = ap->a_cred;
900 int ioflag = ap->a_ioflag;
903 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
905 int bcount, noncontig_write, obcount;
906 int bp_cached, n, on, error = 0, error1, save2, wouldcommit;
907 size_t orig_resid, local_resid;
908 off_t orig_size, tmp_off;
910 KASSERT(uio->uio_rw == UIO_WRITE, ("ncl_write mode"));
911 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
913 if (vp->v_type != VREG)
916 if (np->n_flag & NWRITEERR) {
917 np->n_flag &= ~NWRITEERR;
919 return (np->n_error);
922 mtx_lock(&nmp->nm_mtx);
923 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
924 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
925 mtx_unlock(&nmp->nm_mtx);
926 (void)ncl_fsinfo(nmp, vp, cred, td);
927 mtx_lock(&nmp->nm_mtx);
929 if (nmp->nm_wsize == 0)
930 (void) newnfs_iosize(nmp);
931 mtx_unlock(&nmp->nm_mtx);
934 * Synchronously flush pending buffers if we are in synchronous
935 * mode or if we are appending.
937 if (ioflag & (IO_APPEND | IO_SYNC)) {
939 if (np->n_flag & NMODIFIED) {
941 #ifdef notyet /* Needs matching nonblock semantics elsewhere, too. */
943 * Require non-blocking, synchronous writes to
944 * dirty files to inform the program it needs
945 * to fsync(2) explicitly.
947 if (ioflag & IO_NDELAY)
951 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
952 error = ncl_vinvalbuf(vp, V_SAVE | ((ioflag &
953 IO_VMIO) != 0 ? V_VMIO : 0), td, 1);
960 orig_resid = uio->uio_resid;
962 orig_size = np->n_size;
966 * If IO_APPEND then load uio_offset. We restart here if we cannot
967 * get the append lock.
969 if (ioflag & IO_APPEND) {
971 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
972 error = VOP_GETATTR(vp, &vattr, cred);
976 uio->uio_offset = np->n_size;
980 if (uio->uio_offset < 0)
982 tmp_off = uio->uio_offset + uio->uio_resid;
983 if (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)
985 if (uio->uio_resid == 0)
988 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && vp->v_type == VREG)
989 return nfs_directio_write(vp, uio, cred, ioflag);
992 * Maybe this should be above the vnode op call, but so long as
993 * file servers have no limits, i don't think it matters
995 if (vn_rlimit_fsize(vp, uio, td))
998 save2 = curthread_pflags2_set(TDP2_SBPAGES);
999 biosize = vp->v_bufobj.bo_bsize;
1001 * Find all of this file's B_NEEDCOMMIT buffers. If our writes
1002 * would exceed the local maximum per-file write commit size when
1003 * combined with those, we must decide whether to flush,
1004 * go synchronous, or return error. We don't bother checking
1005 * IO_UNIT -- we just make all writes atomic anyway, as there's
1006 * no point optimizing for something that really won't ever happen.
1009 if (!(ioflag & IO_SYNC)) {
1015 if (nflag & NMODIFIED) {
1016 BO_LOCK(&vp->v_bufobj);
1017 if (vp->v_bufobj.bo_dirty.bv_cnt != 0) {
1018 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd,
1020 if (bp->b_flags & B_NEEDCOMMIT)
1021 wouldcommit += bp->b_bcount;
1024 BO_UNLOCK(&vp->v_bufobj);
1029 if (!(ioflag & IO_SYNC)) {
1030 wouldcommit += biosize;
1031 if (wouldcommit > nmp->nm_wcommitsize) {
1032 np->n_attrstamp = 0;
1033 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1034 error = ncl_vinvalbuf(vp, V_SAVE | ((ioflag &
1035 IO_VMIO) != 0 ? V_VMIO : 0), td, 1);
1038 wouldcommit = biosize;
1042 NFSINCRGLOBAL(nfsstatsv1.biocache_writes);
1043 lbn = uio->uio_offset / biosize;
1044 on = uio->uio_offset - (lbn * biosize);
1045 n = MIN((unsigned)(biosize - on), uio->uio_resid);
1048 * Handle direct append and file extension cases, calculate
1049 * unaligned buffer size.
1052 if ((np->n_flag & NHASBEENLOCKED) == 0 &&
1053 (nmp->nm_flag & NFSMNT_NONCONTIGWR) != 0)
1054 noncontig_write = 1;
1056 noncontig_write = 0;
1057 if ((uio->uio_offset == np->n_size ||
1058 (noncontig_write != 0 &&
1059 lbn == (np->n_size / biosize) &&
1060 uio->uio_offset + n > np->n_size)) && n) {
1063 * Get the buffer (in its pre-append state to maintain
1064 * B_CACHE if it was previously set). Resize the
1065 * nfsnode after we have locked the buffer to prevent
1066 * readers from reading garbage.
1068 obcount = np->n_size - (lbn * biosize);
1069 bp = nfs_getcacheblk(vp, lbn, obcount, td);
1075 np->n_size = uio->uio_offset + n;
1076 np->n_flag |= NMODIFIED;
1077 np->n_flag &= ~NVNSETSZSKIP;
1078 vnode_pager_setsize(vp, np->n_size);
1081 save = bp->b_flags & B_CACHE;
1083 allocbuf(bp, bcount);
1084 bp->b_flags |= save;
1085 if (noncontig_write != 0 && on > obcount)
1086 vfs_bio_bzero_buf(bp, obcount, on -
1091 * Obtain the locked cache block first, and then
1092 * adjust the file's size as appropriate.
1095 if ((off_t)lbn * biosize + bcount < np->n_size) {
1096 if ((off_t)(lbn + 1) * biosize < np->n_size)
1099 bcount = np->n_size - (off_t)lbn * biosize;
1102 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1104 if (uio->uio_offset + n > np->n_size) {
1105 np->n_size = uio->uio_offset + n;
1106 np->n_flag |= NMODIFIED;
1107 np->n_flag &= ~NVNSETSZSKIP;
1108 vnode_pager_setsize(vp, np->n_size);
1114 error = newnfs_sigintr(nmp, td);
1121 * Issue a READ if B_CACHE is not set. In special-append
1122 * mode, B_CACHE is based on the buffer prior to the write
1123 * op and is typically set, avoiding the read. If a read
1124 * is required in special append mode, the server will
1125 * probably send us a short-read since we extended the file
1126 * on our end, resulting in b_resid == 0 and, thusly,
1127 * B_CACHE getting set.
1129 * We can also avoid issuing the read if the write covers
1130 * the entire buffer. We have to make sure the buffer state
1131 * is reasonable in this case since we will not be initiating
1132 * I/O. See the comments in kern/vfs_bio.c's getblk() for
1135 * B_CACHE may also be set due to the buffer being cached
1140 if (on == 0 && n == bcount) {
1141 if ((bp->b_flags & B_CACHE) == 0)
1143 bp->b_flags |= B_CACHE;
1144 bp->b_flags &= ~B_INVAL;
1145 bp->b_ioflags &= ~BIO_ERROR;
1148 if ((bp->b_flags & B_CACHE) == 0) {
1149 bp->b_iocmd = BIO_READ;
1150 vfs_busy_pages(bp, 0);
1151 error = ncl_doio(vp, bp, cred, td, 0);
1157 if (bp->b_wcred == NOCRED)
1158 bp->b_wcred = crhold(cred);
1160 np->n_flag |= NMODIFIED;
1164 * If dirtyend exceeds file size, chop it down. This should
1165 * not normally occur but there is an append race where it
1166 * might occur XXX, so we log it.
1168 * If the chopping creates a reverse-indexed or degenerate
1169 * situation with dirtyoff/end, we 0 both of them.
1172 if (bp->b_dirtyend > bcount) {
1173 printf("NFS append race @%lx:%d\n",
1174 (long)bp->b_blkno * DEV_BSIZE,
1175 bp->b_dirtyend - bcount);
1176 bp->b_dirtyend = bcount;
1179 if (bp->b_dirtyoff >= bp->b_dirtyend)
1180 bp->b_dirtyoff = bp->b_dirtyend = 0;
1183 * If the new write will leave a contiguous dirty
1184 * area, just update the b_dirtyoff and b_dirtyend,
1185 * otherwise force a write rpc of the old dirty area.
1187 * If there has been a file lock applied to this file
1188 * or vfs.nfs.old_noncontig_writing is set, do the following:
1189 * While it is possible to merge discontiguous writes due to
1190 * our having a B_CACHE buffer ( and thus valid read data
1191 * for the hole), we don't because it could lead to
1192 * significant cache coherency problems with multiple clients,
1193 * especially if locking is implemented later on.
1195 * If vfs.nfs.old_noncontig_writing is not set and there has
1196 * not been file locking done on this file:
1197 * Relax coherency a bit for the sake of performance and
1198 * expand the current dirty region to contain the new
1199 * write even if it means we mark some non-dirty data as
1203 if (noncontig_write == 0 && bp->b_dirtyend > 0 &&
1204 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
1205 if (bwrite(bp) == EINTR) {
1212 local_resid = uio->uio_resid;
1213 error = vn_io_fault_uiomove((char *)bp->b_data + on, n, uio);
1215 if (error != 0 && !bp_cached) {
1217 * This block has no other content then what
1218 * possibly was written by the faulty uiomove.
1219 * Release it, forgetting the data pages, to
1220 * prevent the leak of uninitialized data to
1223 bp->b_ioflags |= BIO_ERROR;
1225 uio->uio_offset -= local_resid - uio->uio_resid;
1226 uio->uio_resid = local_resid;
1231 * Since this block is being modified, it must be written
1232 * again and not just committed. Since write clustering does
1233 * not work for the stage 1 data write, only the stage 2
1234 * commit rpc, we have to clear B_CLUSTEROK as well.
1236 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1239 * Get the partial update on the progress made from
1240 * uiomove, if an error occurred.
1243 n = local_resid - uio->uio_resid;
1246 * Only update dirtyoff/dirtyend if not a degenerate
1250 if (bp->b_dirtyend > 0) {
1251 bp->b_dirtyoff = min(on, bp->b_dirtyoff);
1252 bp->b_dirtyend = max((on + n), bp->b_dirtyend);
1254 bp->b_dirtyoff = on;
1255 bp->b_dirtyend = on + n;
1257 vfs_bio_set_valid(bp, on, n);
1261 * If IO_SYNC do bwrite().
1263 * IO_INVAL appears to be unused. The idea appears to be
1264 * to turn off caching in this case. Very odd. XXX
1266 if ((ioflag & IO_SYNC)) {
1267 if (ioflag & IO_INVAL)
1268 bp->b_flags |= B_NOCACHE;
1269 error1 = bwrite(bp);
1275 } else if ((n + on) == biosize || (ioflag & IO_ASYNC) != 0) {
1276 bp->b_flags |= B_ASYNC;
1277 (void) ncl_writebp(bp, 0, NULL);
1284 } while (uio->uio_resid > 0 && n > 0);
1287 if (ioflag & IO_UNIT) {
1289 vattr.va_size = orig_size;
1290 /* IO_SYNC is handled implicitely */
1291 (void)VOP_SETATTR(vp, &vattr, cred);
1292 uio->uio_offset -= orig_resid - uio->uio_resid;
1293 uio->uio_resid = orig_resid;
1298 curthread_pflags2_restore(save2);
1303 * Get an nfs cache block.
1305 * Allocate a new one if the block isn't currently in the cache
1306 * and return the block marked busy. If the calling process is
1307 * interrupted by a signal for an interruptible mount point, return
1310 * The caller must carefully deal with the possible B_INVAL state of
1311 * the buffer. ncl_doio() clears B_INVAL (and ncl_asyncio() clears it
1312 * indirectly), so synchronous reads can be issued without worrying about
1313 * the B_INVAL state. We have to be a little more careful when dealing
1314 * with writes (see comments in nfs_write()) when extending a file past
1318 nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct thread *td)
1322 struct nfsmount *nmp;
1327 if (nmp->nm_flag & NFSMNT_INT) {
1330 newnfs_set_sigmask(td, &oldset);
1331 bp = getblk(vp, bn, size, PCATCH, 0, 0);
1332 newnfs_restore_sigmask(td, &oldset);
1333 while (bp == NULL) {
1334 if (newnfs_sigintr(nmp, td))
1336 bp = getblk(vp, bn, size, 0, 2 * hz, 0);
1339 bp = getblk(vp, bn, size, 0, 0, 0);
1342 if (vp->v_type == VREG)
1343 bp->b_blkno = bn * (vp->v_bufobj.bo_bsize / DEV_BSIZE);
1348 * Flush and invalidate all dirty buffers. If another process is already
1349 * doing the flush, just wait for completion.
1352 ncl_vinvalbuf(struct vnode *vp, int flags, struct thread *td, int intrflg)
1354 struct nfsnode *np = VTONFS(vp);
1355 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1356 int error = 0, slpflag, slptimeo;
1359 ASSERT_VOP_LOCKED(vp, "ncl_vinvalbuf");
1361 if ((nmp->nm_flag & NFSMNT_INT) == 0)
1363 if (NFSCL_FORCEDISM(nmp->nm_mountp))
1373 old_lock = ncl_excl_start(vp);
1375 flags |= V_ALLOWCLEAN;
1378 * Now, flush as required.
1380 if ((flags & (V_SAVE | V_VMIO)) == V_SAVE &&
1381 vp->v_bufobj.bo_object != NULL) {
1382 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object);
1383 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
1384 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object);
1386 * If the page clean was interrupted, fail the invalidation.
1387 * Not doing so, we run the risk of losing dirty pages in the
1388 * vinvalbuf() call below.
1390 if (intrflg && (error = newnfs_sigintr(nmp, td)))
1394 error = vinvalbuf(vp, flags, slpflag, 0);
1396 if (intrflg && (error = newnfs_sigintr(nmp, td)))
1398 error = vinvalbuf(vp, flags, 0, slptimeo);
1400 if (NFSHASPNFS(nmp)) {
1401 nfscl_layoutcommit(vp, td);
1403 * Invalidate the attribute cache, since writes to a DS
1404 * won't update the size attribute.
1407 np->n_attrstamp = 0;
1410 if (np->n_directio_asyncwr == 0)
1411 np->n_flag &= ~NMODIFIED;
1414 ncl_excl_finish(vp, old_lock);
1419 * Initiate asynchronous I/O. Return an error if no nfsiods are available.
1420 * This is mainly to avoid queueing async I/O requests when the nfsiods
1421 * are all hung on a dead server.
1423 * Note: ncl_asyncio() does not clear (BIO_ERROR|B_INVAL) but when the bp
1424 * is eventually dequeued by the async daemon, ncl_doio() *will*.
1427 ncl_asyncio(struct nfsmount *nmp, struct buf *bp, struct ucred *cred, struct thread *td)
1436 * Commits are usually short and sweet so lets save some cpu and
1437 * leave the async daemons for more important rpc's (such as reads
1440 * Readdirplus RPCs do vget()s to acquire the vnodes for entries
1441 * in the directory in order to update attributes. This can deadlock
1442 * with another thread that is waiting for async I/O to be done by
1443 * an nfsiod thread while holding a lock on one of these vnodes.
1444 * To avoid this deadlock, don't allow the async nfsiod threads to
1445 * perform Readdirplus RPCs.
1448 if ((bp->b_iocmd == BIO_WRITE && (bp->b_flags & B_NEEDCOMMIT) &&
1449 (nmp->nm_bufqiods > ncl_numasync / 2)) ||
1450 (bp->b_vp->v_type == VDIR && (nmp->nm_flag & NFSMNT_RDIRPLUS))) {
1455 if (nmp->nm_flag & NFSMNT_INT)
1460 * Find a free iod to process this request.
1462 for (iod = 0; iod < ncl_numasync; iod++)
1463 if (ncl_iodwant[iod] == NFSIOD_AVAILABLE) {
1469 * Try to create one if none are free.
1475 * Found one, so wake it up and tell it which
1478 NFS_DPF(ASYNCIO, ("ncl_asyncio: waking iod %d for mount %p\n",
1480 ncl_iodwant[iod] = NFSIOD_NOT_AVAILABLE;
1481 ncl_iodmount[iod] = nmp;
1483 wakeup(&ncl_iodwant[iod]);
1487 * If none are free, we may already have an iod working on this mount
1488 * point. If so, it will process our request.
1491 if (nmp->nm_bufqiods > 0) {
1493 ("ncl_asyncio: %d iods are already processing mount %p\n",
1494 nmp->nm_bufqiods, nmp));
1500 * If we have an iod which can process the request, then queue
1505 * Ensure that the queue never grows too large. We still want
1506 * to asynchronize so we block rather then return EIO.
1508 while (nmp->nm_bufqlen >= 2*ncl_numasync) {
1510 ("ncl_asyncio: waiting for mount %p queue to drain\n", nmp));
1511 nmp->nm_bufqwant = TRUE;
1512 error = newnfs_msleep(td, &nmp->nm_bufq,
1513 &ncl_iod_mutex, slpflag | PRIBIO, "nfsaio",
1516 error2 = newnfs_sigintr(nmp, td);
1521 if (slpflag == PCATCH) {
1527 * We might have lost our iod while sleeping,
1528 * so check and loop if necessary.
1533 /* We might have lost our nfsiod */
1534 if (nmp->nm_bufqiods == 0) {
1536 ("ncl_asyncio: no iods after mount %p queue was drained, looping\n", nmp));
1540 if (bp->b_iocmd == BIO_READ) {
1541 if (bp->b_rcred == NOCRED && cred != NOCRED)
1542 bp->b_rcred = crhold(cred);
1544 if (bp->b_wcred == NOCRED && cred != NOCRED)
1545 bp->b_wcred = crhold(cred);
1548 if (bp->b_flags & B_REMFREE)
1551 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist);
1553 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1554 NFSLOCKNODE(VTONFS(bp->b_vp));
1555 VTONFS(bp->b_vp)->n_flag |= NMODIFIED;
1556 VTONFS(bp->b_vp)->n_directio_asyncwr++;
1557 NFSUNLOCKNODE(VTONFS(bp->b_vp));
1566 * All the iods are busy on other mounts, so return EIO to
1567 * force the caller to process the i/o synchronously.
1569 NFS_DPF(ASYNCIO, ("ncl_asyncio: no iods available, i/o is synchronous\n"));
1574 ncl_doio_directwrite(struct buf *bp)
1576 int iomode, must_commit;
1577 struct uio *uiop = (struct uio *)bp->b_caller1;
1578 char *iov_base = uiop->uio_iov->iov_base;
1580 iomode = NFSWRITE_FILESYNC;
1581 uiop->uio_td = NULL; /* NULL since we're in nfsiod */
1582 ncl_writerpc(bp->b_vp, uiop, bp->b_wcred, &iomode, &must_commit, 0);
1583 KASSERT((must_commit == 0), ("ncl_doio_directwrite: Did not commit write"));
1584 free(iov_base, M_NFSDIRECTIO);
1585 free(uiop->uio_iov, M_NFSDIRECTIO);
1586 free(uiop, M_NFSDIRECTIO);
1587 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1588 struct nfsnode *np = VTONFS(bp->b_vp);
1590 if (NFSHASPNFS(VFSTONFS(bp->b_vp->v_mount))) {
1592 * Invalidate the attribute cache, since writes to a DS
1593 * won't update the size attribute.
1595 np->n_attrstamp = 0;
1597 np->n_directio_asyncwr--;
1598 if (np->n_directio_asyncwr == 0) {
1599 np->n_flag &= ~NMODIFIED;
1600 if ((np->n_flag & NFSYNCWAIT)) {
1601 np->n_flag &= ~NFSYNCWAIT;
1602 wakeup((caddr_t)&np->n_directio_asyncwr);
1608 uma_zfree(ncl_pbuf_zone, bp);
1612 * Do an I/O operation to/from a cache block. This may be called
1613 * synchronously or from an nfsiod.
1616 ncl_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td,
1617 int called_from_strategy)
1621 struct nfsmount *nmp;
1622 int error = 0, iomode, must_commit = 0;
1625 struct proc *p = td ? td->td_proc : NULL;
1629 nmp = VFSTONFS(vp->v_mount);
1631 uiop->uio_iov = &io;
1632 uiop->uio_iovcnt = 1;
1633 uiop->uio_segflg = UIO_SYSSPACE;
1637 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
1638 * do this here so we do not have to do it in all the code that
1641 bp->b_flags &= ~B_INVAL;
1642 bp->b_ioflags &= ~BIO_ERROR;
1644 KASSERT(!(bp->b_flags & B_DONE), ("ncl_doio: bp %p already marked done", bp));
1645 iocmd = bp->b_iocmd;
1646 if (iocmd == BIO_READ) {
1647 io.iov_len = uiop->uio_resid = bp->b_bcount;
1648 io.iov_base = bp->b_data;
1649 uiop->uio_rw = UIO_READ;
1651 switch (vp->v_type) {
1653 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
1654 NFSINCRGLOBAL(nfsstatsv1.read_bios);
1655 error = ncl_readrpc(vp, uiop, cr);
1658 if (uiop->uio_resid) {
1660 * If we had a short read with no error, we must have
1661 * hit a file hole. We should zero-fill the remainder.
1662 * This can also occur if the server hits the file EOF.
1664 * Holes used to be able to occur due to pending
1665 * writes, but that is not possible any longer.
1667 int nread = bp->b_bcount - uiop->uio_resid;
1668 ssize_t left = uiop->uio_resid;
1671 bzero((char *)bp->b_data + nread, left);
1672 uiop->uio_resid = 0;
1675 /* ASSERT_VOP_LOCKED(vp, "ncl_doio"); */
1676 if (p && vp->v_writecount <= -1) {
1678 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &np->n_vattr.na_mtime)) {
1681 killproc(p, "text file modification");
1688 uiop->uio_offset = (off_t)0;
1689 NFSINCRGLOBAL(nfsstatsv1.readlink_bios);
1690 error = ncl_readlinkrpc(vp, uiop, cr);
1693 NFSINCRGLOBAL(nfsstatsv1.readdir_bios);
1694 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
1695 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) != 0) {
1696 error = ncl_readdirplusrpc(vp, uiop, cr, td);
1697 if (error == NFSERR_NOTSUPP)
1698 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
1700 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
1701 error = ncl_readdirrpc(vp, uiop, cr, td);
1703 * end-of-directory sets B_INVAL but does not generate an
1706 if (error == 0 && uiop->uio_resid == bp->b_bcount)
1707 bp->b_flags |= B_INVAL;
1710 printf("ncl_doio: type %x unexpected\n", vp->v_type);
1714 bp->b_ioflags |= BIO_ERROR;
1715 bp->b_error = error;
1719 * If we only need to commit, try to commit
1721 if (bp->b_flags & B_NEEDCOMMIT) {
1725 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
1726 retv = ncl_commit(vp, off, bp->b_dirtyend-bp->b_dirtyoff,
1729 bp->b_dirtyoff = bp->b_dirtyend = 0;
1730 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1735 if (retv == NFSERR_STALEWRITEVERF) {
1736 ncl_clearcommit(vp->v_mount);
1741 * Setup for actual write
1744 if ((off_t)bp->b_blkno * DEV_BSIZE + bp->b_dirtyend > np->n_size)
1745 bp->b_dirtyend = np->n_size - (off_t)bp->b_blkno * DEV_BSIZE;
1748 if (bp->b_dirtyend > bp->b_dirtyoff) {
1749 io.iov_len = uiop->uio_resid = bp->b_dirtyend
1751 uiop->uio_offset = (off_t)bp->b_blkno * DEV_BSIZE
1753 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
1754 uiop->uio_rw = UIO_WRITE;
1755 NFSINCRGLOBAL(nfsstatsv1.write_bios);
1757 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC)
1758 iomode = NFSWRITE_UNSTABLE;
1760 iomode = NFSWRITE_FILESYNC;
1762 error = ncl_writerpc(vp, uiop, cr, &iomode, &must_commit,
1763 called_from_strategy);
1766 * When setting B_NEEDCOMMIT also set B_CLUSTEROK to try
1767 * to cluster the buffers needing commit. This will allow
1768 * the system to submit a single commit rpc for the whole
1769 * cluster. We can do this even if the buffer is not 100%
1770 * dirty (relative to the NFS blocksize), so we optimize the
1771 * append-to-file-case.
1773 * (when clearing B_NEEDCOMMIT, B_CLUSTEROK must also be
1774 * cleared because write clustering only works for commit
1775 * rpc's, not for the data portion of the write).
1778 if (!error && iomode == NFSWRITE_UNSTABLE) {
1779 bp->b_flags |= B_NEEDCOMMIT;
1780 if (bp->b_dirtyoff == 0
1781 && bp->b_dirtyend == bp->b_bcount)
1782 bp->b_flags |= B_CLUSTEROK;
1784 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1788 * For an interrupted write, the buffer is still valid
1789 * and the write hasn't been pushed to the server yet,
1790 * so we can't set BIO_ERROR and report the interruption
1791 * by setting B_EINTR. For the B_ASYNC case, B_EINTR
1792 * is not relevant, so the rpc attempt is essentially
1793 * a noop. For the case of a V3 write rpc not being
1794 * committed to stable storage, the block is still
1795 * dirty and requires either a commit rpc or another
1796 * write rpc with iomode == NFSV3WRITE_FILESYNC before
1797 * the block is reused. This is indicated by setting
1798 * the B_DELWRI and B_NEEDCOMMIT flags.
1800 * EIO is returned by ncl_writerpc() to indicate a recoverable
1801 * write error and is handled as above, except that
1802 * B_EINTR isn't set. One cause of this is a stale stateid
1803 * error for the RPC that indicates recovery is required,
1804 * when called with called_from_strategy != 0.
1806 * If the buffer is marked B_PAGING, it does not reside on
1807 * the vp's paging queues so we cannot call bdirty(). The
1808 * bp in this case is not an NFS cache block so we should
1811 * The logic below breaks up errors into recoverable and
1812 * unrecoverable. For the former, we clear B_INVAL|B_NOCACHE
1813 * and keep the buffer around for potential write retries.
1814 * For the latter (eg ESTALE), we toss the buffer away (B_INVAL)
1815 * and save the error in the nfsnode. This is less than ideal
1816 * but necessary. Keeping such buffers around could potentially
1817 * cause buffer exhaustion eventually (they can never be written
1818 * out, so will get constantly be re-dirtied). It also causes
1819 * all sorts of vfs panics. For non-recoverable write errors,
1820 * also invalidate the attrcache, so we'll be forced to go over
1821 * the wire for this object, returning an error to user on next
1822 * call (most of the time).
1824 if (error == EINTR || error == EIO || error == ETIMEDOUT
1825 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
1826 bp->b_flags &= ~(B_INVAL|B_NOCACHE);
1827 if ((bp->b_flags & B_PAGING) == 0) {
1829 bp->b_flags &= ~B_DONE;
1831 if ((error == EINTR || error == ETIMEDOUT) &&
1832 (bp->b_flags & B_ASYNC) == 0)
1833 bp->b_flags |= B_EINTR;
1836 bp->b_ioflags |= BIO_ERROR;
1837 bp->b_flags |= B_INVAL;
1838 bp->b_error = np->n_error = error;
1840 np->n_flag |= NWRITEERR;
1841 np->n_attrstamp = 0;
1842 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1845 bp->b_dirtyoff = bp->b_dirtyend = 0;
1853 bp->b_resid = uiop->uio_resid;
1855 ncl_clearcommit(vp->v_mount);
1861 * Used to aid in handling ftruncate() operations on the NFS client side.
1862 * Truncation creates a number of special problems for NFS. We have to
1863 * throw away VM pages and buffer cache buffers that are beyond EOF, and
1864 * we have to properly handle VM pages or (potentially dirty) buffers
1865 * that straddle the truncation point.
1869 ncl_meta_setsize(struct vnode *vp, struct thread *td, u_quad_t nsize)
1871 struct nfsnode *np = VTONFS(vp);
1873 int biosize = vp->v_bufobj.bo_bsize;
1881 if (nsize < tsize) {
1887 * vtruncbuf() doesn't get the buffer overlapping the
1888 * truncation point. We may have a B_DELWRI and/or B_CACHE
1889 * buffer that now needs to be truncated.
1891 error = vtruncbuf(vp, nsize, biosize);
1892 lbn = nsize / biosize;
1893 bufsize = nsize - (lbn * biosize);
1894 bp = nfs_getcacheblk(vp, lbn, bufsize, td);
1897 if (bp->b_dirtyoff > bp->b_bcount)
1898 bp->b_dirtyoff = bp->b_bcount;
1899 if (bp->b_dirtyend > bp->b_bcount)
1900 bp->b_dirtyend = bp->b_bcount;
1901 bp->b_flags |= B_RELBUF; /* don't leave garbage around */
1904 vnode_pager_setsize(vp, nsize);