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, long *sz)
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;
119 ncl_getpages(struct vop_getpages_args *ap)
121 int i, error, nextoff, size, toff, count, npages;
129 struct nfsmount *nmp;
137 cred = curthread->td_ucred;
138 nmp = VFSTONFS(vp->v_mount);
140 npages = ap->a_count;
142 if ((object = vp->v_object) == NULL) {
143 printf("ncl_getpages: called with non-merged cache vnode\n");
144 return (VM_PAGER_ERROR);
147 if (newnfs_directio_enable && !newnfs_directio_allow_mmap) {
149 if ((np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
151 printf("ncl_getpages: called on non-cacheable vnode\n");
152 return (VM_PAGER_ERROR);
157 mtx_lock(&nmp->nm_mtx);
158 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
159 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
160 mtx_unlock(&nmp->nm_mtx);
161 /* We'll never get here for v4, because we always have fsinfo */
162 (void)ncl_fsinfo(nmp, vp, cred, td);
164 mtx_unlock(&nmp->nm_mtx);
167 return (vfs_bio_getpages(vp, pages, npages, ap->a_rbehind,
168 ap->a_rahead, ncl_gbp_getblkno, ncl_gbp_getblksz));
171 * If the requested page is partially valid, just return it and
172 * allow the pager to zero-out the blanks. Partially valid pages
173 * can only occur at the file EOF.
175 * XXXGL: is that true for NFS, where short read can occur???
177 VM_OBJECT_WLOCK(object);
178 if (!vm_page_none_valid(pages[npages - 1]) && --npages == 0)
180 VM_OBJECT_WUNLOCK(object);
183 * We use only the kva address for the buffer, but this is extremely
184 * convenient and fast.
186 bp = uma_zalloc(ncl_pbuf_zone, M_WAITOK);
188 kva = (vm_offset_t) bp->b_data;
189 pmap_qenter(kva, pages, npages);
190 VM_CNT_INC(v_vnodein);
191 VM_CNT_ADD(v_vnodepgsin, npages);
193 count = npages << PAGE_SHIFT;
194 iov.iov_base = (caddr_t) kva;
198 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
199 uio.uio_resid = count;
200 uio.uio_segflg = UIO_SYSSPACE;
201 uio.uio_rw = UIO_READ;
204 error = ncl_readrpc(vp, &uio, cred);
205 pmap_qremove(kva, npages);
207 uma_zfree(ncl_pbuf_zone, bp);
209 if (error && (uio.uio_resid == count)) {
210 printf("ncl_getpages: error %d\n", error);
211 return (VM_PAGER_ERROR);
215 * Calculate the number of bytes read and validate only that number
216 * of bytes. Note that due to pending writes, size may be 0. This
217 * does not mean that the remaining data is invalid!
220 size = count - uio.uio_resid;
221 VM_OBJECT_WLOCK(object);
222 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
224 nextoff = toff + PAGE_SIZE;
227 if (nextoff <= size) {
229 * Read operation filled an entire page
232 KASSERT(m->dirty == 0,
233 ("nfs_getpages: page %p is dirty", m));
234 } else if (size > toff) {
236 * Read operation filled a partial page.
239 vm_page_set_valid_range(m, 0, size - toff);
240 KASSERT(m->dirty == 0,
241 ("nfs_getpages: page %p is dirty", m));
244 * Read operation was short. If no error
245 * occurred we may have hit a zero-fill
246 * section. We leave valid set to 0, and page
247 * is freed by vm_page_readahead_finish() if
248 * its index is not equal to requested, or
249 * page is zeroed and set valid by
250 * vm_pager_get_pages() for requested page.
256 VM_OBJECT_WUNLOCK(object);
261 return (VM_PAGER_OK);
265 * Vnode op for VM putpages.
268 ncl_putpages(struct vop_putpages_args *ap)
272 int i, error, npages, count;
278 struct nfsmount *nmp;
284 td = curthread; /* XXX */
285 /* Set the cred to n_writecred for the write rpcs. */
286 if (np->n_writecred != NULL)
287 cred = crhold(np->n_writecred);
289 cred = crhold(curthread->td_ucred); /* XXX */
290 nmp = VFSTONFS(vp->v_mount);
293 rtvals = ap->a_rtvals;
294 npages = btoc(count);
295 offset = IDX_TO_OFF(pages[0]->pindex);
297 mtx_lock(&nmp->nm_mtx);
298 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
299 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
300 mtx_unlock(&nmp->nm_mtx);
301 (void)ncl_fsinfo(nmp, vp, cred, td);
303 mtx_unlock(&nmp->nm_mtx);
306 if (newnfs_directio_enable && !newnfs_directio_allow_mmap &&
307 (np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
309 printf("ncl_putpages: called on noncache-able vnode\n");
313 * When putting pages, do not extend file past EOF.
315 if (offset + count > np->n_size) {
316 count = np->n_size - offset;
322 for (i = 0; i < npages; i++)
323 rtvals[i] = VM_PAGER_ERROR;
325 VM_CNT_INC(v_vnodeout);
326 VM_CNT_ADD(v_vnodepgsout, count);
328 iov.iov_base = unmapped_buf;
332 uio.uio_offset = offset;
333 uio.uio_resid = count;
334 uio.uio_segflg = UIO_NOCOPY;
335 uio.uio_rw = UIO_WRITE;
338 error = VOP_WRITE(vp, &uio, vnode_pager_putpages_ioflags(ap->a_sync),
342 if (error == 0 || !nfs_keep_dirty_on_error) {
343 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid,
344 np->n_size - offset, npages * PAGE_SIZE);
350 * For nfs, cache consistency can only be maintained approximately.
351 * Although RFC1094 does not specify the criteria, the following is
352 * believed to be compatible with the reference port.
354 * If the file's modify time on the server has changed since the
355 * last read rpc or you have written to the file,
356 * you may have lost data cache consistency with the
357 * server, so flush all of the file's data out of the cache.
358 * Then force a getattr rpc to ensure that you have up to date
360 * NB: This implies that cache data can be read when up to
361 * NFS_ATTRTIMEO seconds out of date. If you find that you need current
362 * attributes this could be forced by setting n_attrstamp to 0 before
363 * the VOP_GETATTR() call.
366 nfs_bioread_check_cons(struct vnode *vp, struct thread *td, struct ucred *cred)
370 struct nfsnode *np = VTONFS(vp);
374 * Ensure the exclusove access to the node before checking
375 * whether the cache is consistent.
377 old_lock = ncl_excl_start(vp);
379 if (np->n_flag & NMODIFIED) {
381 if (vp->v_type != VREG) {
382 if (vp->v_type != VDIR)
383 panic("nfs: bioread, not dir");
385 error = ncl_vinvalbuf(vp, V_SAVE | V_ALLOWCLEAN, td, 1);
390 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
391 error = VOP_GETATTR(vp, &vattr, cred);
395 np->n_mtime = vattr.va_mtime;
399 error = VOP_GETATTR(vp, &vattr, cred);
403 if ((np->n_flag & NSIZECHANGED)
404 || (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime))) {
406 if (vp->v_type == VDIR)
408 error = ncl_vinvalbuf(vp, V_SAVE | V_ALLOWCLEAN, td, 1);
412 np->n_mtime = vattr.va_mtime;
413 np->n_flag &= ~NSIZECHANGED;
418 ncl_excl_finish(vp, old_lock);
423 * Vnode op for read using bio
426 ncl_bioread(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred)
428 struct nfsnode *np = VTONFS(vp);
429 struct buf *bp, *rabp;
431 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
433 int biosize, bcount, error, i, n, nra, on, save2, seqcount;
436 KASSERT(uio->uio_rw == UIO_READ, ("ncl_read mode"));
437 if (uio->uio_resid == 0)
439 if (uio->uio_offset < 0) /* XXX VDIR cookies can be negative */
443 mtx_lock(&nmp->nm_mtx);
444 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
445 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
446 mtx_unlock(&nmp->nm_mtx);
447 (void)ncl_fsinfo(nmp, vp, cred, td);
448 mtx_lock(&nmp->nm_mtx);
450 if (nmp->nm_rsize == 0 || nmp->nm_readdirsize == 0)
451 (void) newnfs_iosize(nmp);
453 tmp_off = uio->uio_offset + uio->uio_resid;
454 if (vp->v_type != VDIR &&
455 (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)) {
456 mtx_unlock(&nmp->nm_mtx);
459 mtx_unlock(&nmp->nm_mtx);
461 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && (vp->v_type == VREG))
462 /* No caching/ no readaheads. Just read data into the user buffer */
463 return ncl_readrpc(vp, uio, cred);
467 biosize = vp->v_bufobj.bo_bsize;
468 seqcount = (int)((off_t)(ioflag >> IO_SEQSHIFT) * biosize / BKVASIZE);
470 error = nfs_bioread_check_cons(vp, td, cred);
474 save2 = curthread_pflags2_set(TDP2_SBPAGES);
482 switch (vp->v_type) {
484 NFSINCRGLOBAL(nfsstatsv1.biocache_reads);
485 lbn = uio->uio_offset / biosize;
486 on = uio->uio_offset - (lbn * biosize);
489 * Start the read ahead(s), as required.
491 if (nmp->nm_readahead > 0) {
492 for (nra = 0; nra < nmp->nm_readahead && nra < seqcount &&
493 (off_t)(lbn + 1 + nra) * biosize < nsize; nra++) {
494 rabn = lbn + 1 + nra;
495 if (incore(&vp->v_bufobj, rabn) == NULL) {
496 rabp = nfs_getcacheblk(vp, rabn, biosize, td);
498 error = newnfs_sigintr(nmp, td);
503 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
504 rabp->b_flags |= B_ASYNC;
505 rabp->b_iocmd = BIO_READ;
506 vfs_busy_pages(rabp, 0);
507 if (ncl_asyncio(nmp, rabp, cred, td)) {
508 rabp->b_flags |= B_INVAL;
509 rabp->b_ioflags |= BIO_ERROR;
510 vfs_unbusy_pages(rabp);
521 /* Note that bcount is *not* DEV_BSIZE aligned. */
523 if ((off_t)lbn * biosize >= nsize) {
525 } else if ((off_t)(lbn + 1) * biosize > nsize) {
526 bcount = nsize - (off_t)lbn * biosize;
528 bp = nfs_getcacheblk(vp, lbn, bcount, td);
531 error = newnfs_sigintr(nmp, td);
538 * If B_CACHE is not set, we must issue the read. If this
539 * fails, we return an error.
542 if ((bp->b_flags & B_CACHE) == 0) {
543 bp->b_iocmd = BIO_READ;
544 vfs_busy_pages(bp, 0);
545 error = ncl_doio(vp, bp, cred, td, 0);
553 * on is the offset into the current bp. Figure out how many
554 * bytes we can copy out of the bp. Note that bcount is
555 * NOT DEV_BSIZE aligned.
557 * Then figure out how many bytes we can copy into the uio.
562 n = MIN((unsigned)(bcount - on), uio->uio_resid);
565 NFSINCRGLOBAL(nfsstatsv1.biocache_readlinks);
566 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, td);
568 error = newnfs_sigintr(nmp, td);
573 if ((bp->b_flags & B_CACHE) == 0) {
574 bp->b_iocmd = BIO_READ;
575 vfs_busy_pages(bp, 0);
576 error = ncl_doio(vp, bp, cred, td, 0);
578 bp->b_ioflags |= BIO_ERROR;
583 n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
587 NFSINCRGLOBAL(nfsstatsv1.biocache_readdirs);
589 if (np->n_direofoffset
590 && uio->uio_offset >= np->n_direofoffset) {
596 lbn = (uoff_t)uio->uio_offset / NFS_DIRBLKSIZ;
597 on = uio->uio_offset & (NFS_DIRBLKSIZ - 1);
598 bp = nfs_getcacheblk(vp, lbn, NFS_DIRBLKSIZ, td);
600 error = newnfs_sigintr(nmp, td);
605 if ((bp->b_flags & B_CACHE) == 0) {
606 bp->b_iocmd = BIO_READ;
607 vfs_busy_pages(bp, 0);
608 error = ncl_doio(vp, bp, cred, td, 0);
612 while (error == NFSERR_BAD_COOKIE) {
614 error = ncl_vinvalbuf(vp, 0, td, 1);
617 * Yuck! The directory has been modified on the
618 * server. The only way to get the block is by
619 * reading from the beginning to get all the
622 * Leave the last bp intact unless there is an error.
623 * Loop back up to the while if the error is another
624 * NFSERR_BAD_COOKIE (double yuch!).
626 for (i = 0; i <= lbn && !error; i++) {
628 if (np->n_direofoffset
629 && (i * NFS_DIRBLKSIZ) >= np->n_direofoffset) {
635 bp = nfs_getcacheblk(vp, i, NFS_DIRBLKSIZ, td);
637 error = newnfs_sigintr(nmp, td);
642 if ((bp->b_flags & B_CACHE) == 0) {
643 bp->b_iocmd = BIO_READ;
644 vfs_busy_pages(bp, 0);
645 error = ncl_doio(vp, bp, cred, td, 0);
647 * no error + B_INVAL == directory EOF,
650 if (error == 0 && (bp->b_flags & B_INVAL))
654 * An error will throw away the block and the
655 * for loop will break out. If no error and this
656 * is not the block we want, we throw away the
657 * block and go for the next one via the for loop.
659 if (error || i < lbn)
664 * The above while is repeated if we hit another cookie
665 * error. If we hit an error and it wasn't a cookie error,
673 * If not eof and read aheads are enabled, start one.
674 * (You need the current block first, so that you have the
675 * directory offset cookie of the next block.)
678 if (nmp->nm_readahead > 0 &&
679 (bp->b_flags & B_INVAL) == 0 &&
680 (np->n_direofoffset == 0 ||
681 (lbn + 1) * NFS_DIRBLKSIZ < np->n_direofoffset) &&
682 incore(&vp->v_bufobj, lbn + 1) == NULL) {
684 rabp = nfs_getcacheblk(vp, lbn + 1, NFS_DIRBLKSIZ, td);
686 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
687 rabp->b_flags |= B_ASYNC;
688 rabp->b_iocmd = BIO_READ;
689 vfs_busy_pages(rabp, 0);
690 if (ncl_asyncio(nmp, rabp, cred, td)) {
691 rabp->b_flags |= B_INVAL;
692 rabp->b_ioflags |= BIO_ERROR;
693 vfs_unbusy_pages(rabp);
703 * Unlike VREG files, whos buffer size ( bp->b_bcount ) is
704 * chopped for the EOF condition, we cannot tell how large
705 * NFS directories are going to be until we hit EOF. So
706 * an NFS directory buffer is *not* chopped to its EOF. Now,
707 * it just so happens that b_resid will effectively chop it
708 * to EOF. *BUT* this information is lost if the buffer goes
709 * away and is reconstituted into a B_CACHE state ( due to
710 * being VMIO ) later. So we keep track of the directory eof
711 * in np->n_direofoffset and chop it off as an extra step
714 n = lmin(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid - on);
715 if (np->n_direofoffset && n > np->n_direofoffset - uio->uio_offset)
716 n = np->n_direofoffset - uio->uio_offset;
720 printf(" ncl_bioread: type %x unexpected\n", vp->v_type);
726 error = vn_io_fault_uiomove(bp->b_data + on, (int)n, uio);
728 if (vp->v_type == VLNK)
732 } while (error == 0 && uio->uio_resid > 0 && n > 0);
734 curthread_pflags2_restore(save2);
735 if ((curthread->td_pflags2 & TDP2_SBPAGES) == 0) {
737 ncl_pager_setsize(vp, NULL);
743 * The NFS write path cannot handle iovecs with len > 1. So we need to
744 * break up iovecs accordingly (restricting them to wsize).
745 * For the SYNC case, we can do this with 1 copy (user buffer -> mbuf).
746 * For the ASYNC case, 2 copies are needed. The first a copy from the
747 * user buffer to a staging buffer and then a second copy from the staging
748 * buffer to mbufs. This can be optimized by copying from the user buffer
749 * directly into mbufs and passing the chain down, but that requires a
750 * fair amount of re-working of the relevant codepaths (and can be done
754 nfs_directio_write(vp, uiop, cred, ioflag)
761 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
762 struct thread *td = uiop->uio_td;
766 mtx_lock(&nmp->nm_mtx);
767 wsize = nmp->nm_wsize;
768 mtx_unlock(&nmp->nm_mtx);
769 if (ioflag & IO_SYNC) {
770 int iomode, must_commit;
774 while (uiop->uio_resid > 0) {
775 size = MIN(uiop->uio_resid, wsize);
776 size = MIN(uiop->uio_iov->iov_len, size);
777 iov.iov_base = uiop->uio_iov->iov_base;
781 uio.uio_offset = uiop->uio_offset;
782 uio.uio_resid = size;
783 uio.uio_segflg = UIO_USERSPACE;
784 uio.uio_rw = UIO_WRITE;
786 iomode = NFSWRITE_FILESYNC;
787 error = ncl_writerpc(vp, &uio, cred, &iomode,
789 KASSERT((must_commit == 0),
790 ("ncl_directio_write: Did not commit write"));
793 uiop->uio_offset += size;
794 uiop->uio_resid -= size;
795 if (uiop->uio_iov->iov_len <= size) {
799 uiop->uio_iov->iov_base =
800 (char *)uiop->uio_iov->iov_base + size;
801 uiop->uio_iov->iov_len -= size;
810 * Break up the write into blocksize chunks and hand these
811 * over to nfsiod's for write back.
812 * Unfortunately, this incurs a copy of the data. Since
813 * the user could modify the buffer before the write is
816 * The obvious optimization here is that one of the 2 copies
817 * in the async write path can be eliminated by copying the
818 * data here directly into mbufs and passing the mbuf chain
819 * down. But that will require a fair amount of re-working
820 * of the code and can be done if there's enough interest
821 * in NFS directio access.
823 while (uiop->uio_resid > 0) {
824 size = MIN(uiop->uio_resid, wsize);
825 size = MIN(uiop->uio_iov->iov_len, size);
826 bp = uma_zalloc(ncl_pbuf_zone, M_WAITOK);
827 t_uio = malloc(sizeof(struct uio), M_NFSDIRECTIO, M_WAITOK);
828 t_iov = malloc(sizeof(struct iovec), M_NFSDIRECTIO, M_WAITOK);
829 t_iov->iov_base = malloc(size, M_NFSDIRECTIO, M_WAITOK);
830 t_iov->iov_len = size;
831 t_uio->uio_iov = t_iov;
832 t_uio->uio_iovcnt = 1;
833 t_uio->uio_offset = uiop->uio_offset;
834 t_uio->uio_resid = size;
835 t_uio->uio_segflg = UIO_SYSSPACE;
836 t_uio->uio_rw = UIO_WRITE;
838 KASSERT(uiop->uio_segflg == UIO_USERSPACE ||
839 uiop->uio_segflg == UIO_SYSSPACE,
840 ("nfs_directio_write: Bad uio_segflg"));
841 if (uiop->uio_segflg == UIO_USERSPACE) {
842 error = copyin(uiop->uio_iov->iov_base,
843 t_iov->iov_base, size);
848 * UIO_SYSSPACE may never happen, but handle
849 * it just in case it does.
851 bcopy(uiop->uio_iov->iov_base, t_iov->iov_base,
853 bp->b_flags |= B_DIRECT;
854 bp->b_iocmd = BIO_WRITE;
855 if (cred != NOCRED) {
859 bp->b_wcred = NOCRED;
860 bp->b_caller1 = (void *)t_uio;
862 error = ncl_asyncio(nmp, bp, NOCRED, td);
865 free(t_iov->iov_base, M_NFSDIRECTIO);
866 free(t_iov, M_NFSDIRECTIO);
867 free(t_uio, M_NFSDIRECTIO);
869 uma_zfree(ncl_pbuf_zone, bp);
874 uiop->uio_offset += size;
875 uiop->uio_resid -= size;
876 if (uiop->uio_iov->iov_len <= size) {
880 uiop->uio_iov->iov_base =
881 (char *)uiop->uio_iov->iov_base + size;
882 uiop->uio_iov->iov_len -= size;
890 * Vnode op for write using bio
893 ncl_write(struct vop_write_args *ap)
896 struct uio *uio = ap->a_uio;
897 struct thread *td = uio->uio_td;
898 struct vnode *vp = ap->a_vp;
899 struct nfsnode *np = VTONFS(vp);
900 struct ucred *cred = ap->a_cred;
901 int ioflag = ap->a_ioflag;
904 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
906 int bcount, noncontig_write, obcount;
907 int bp_cached, n, on, error = 0, error1, save2, wouldcommit;
908 size_t orig_resid, local_resid;
909 off_t orig_size, tmp_off;
912 KASSERT(uio->uio_rw == UIO_WRITE, ("ncl_write mode"));
913 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
915 if (vp->v_type != VREG)
918 if (np->n_flag & NWRITEERR) {
919 np->n_flag &= ~NWRITEERR;
921 return (np->n_error);
924 mtx_lock(&nmp->nm_mtx);
925 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
926 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
927 mtx_unlock(&nmp->nm_mtx);
928 (void)ncl_fsinfo(nmp, vp, cred, td);
929 mtx_lock(&nmp->nm_mtx);
931 if (nmp->nm_wsize == 0)
932 (void) newnfs_iosize(nmp);
933 mtx_unlock(&nmp->nm_mtx);
936 * Synchronously flush pending buffers if we are in synchronous
937 * mode or if we are appending.
939 if (ioflag & (IO_APPEND | IO_SYNC)) {
941 if (np->n_flag & NMODIFIED) {
943 #ifdef notyet /* Needs matching nonblock semantics elsewhere, too. */
945 * Require non-blocking, synchronous writes to
946 * dirty files to inform the program it needs
947 * to fsync(2) explicitly.
949 if (ioflag & IO_NDELAY)
953 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
954 error = ncl_vinvalbuf(vp, V_SAVE | ((ioflag &
955 IO_VMIO) != 0 ? V_VMIO : 0), td, 1);
962 orig_resid = uio->uio_resid;
964 orig_size = np->n_size;
968 * If IO_APPEND then load uio_offset. We restart here if we cannot
969 * get the append lock.
971 if (ioflag & IO_APPEND) {
973 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
974 error = VOP_GETATTR(vp, &vattr, cred);
978 uio->uio_offset = np->n_size;
982 if (uio->uio_offset < 0)
984 tmp_off = uio->uio_offset + uio->uio_resid;
985 if (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)
987 if (uio->uio_resid == 0)
990 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && vp->v_type == VREG)
991 return nfs_directio_write(vp, uio, cred, ioflag);
994 * Maybe this should be above the vnode op call, but so long as
995 * file servers have no limits, i don't think it matters
997 if (vn_rlimit_fsize(vp, uio, td))
1000 save2 = curthread_pflags2_set(TDP2_SBPAGES);
1001 biosize = vp->v_bufobj.bo_bsize;
1003 * Find all of this file's B_NEEDCOMMIT buffers. If our writes
1004 * would exceed the local maximum per-file write commit size when
1005 * combined with those, we must decide whether to flush,
1006 * go synchronous, or return error. We don't bother checking
1007 * IO_UNIT -- we just make all writes atomic anyway, as there's
1008 * no point optimizing for something that really won't ever happen.
1011 if (!(ioflag & IO_SYNC)) {
1017 if (nflag & NMODIFIED) {
1018 BO_LOCK(&vp->v_bufobj);
1019 if (vp->v_bufobj.bo_dirty.bv_cnt != 0) {
1020 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd,
1022 if (bp->b_flags & B_NEEDCOMMIT)
1023 wouldcommit += bp->b_bcount;
1026 BO_UNLOCK(&vp->v_bufobj);
1031 if (!(ioflag & IO_SYNC)) {
1032 wouldcommit += biosize;
1033 if (wouldcommit > nmp->nm_wcommitsize) {
1034 np->n_attrstamp = 0;
1035 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1036 error = ncl_vinvalbuf(vp, V_SAVE | ((ioflag &
1037 IO_VMIO) != 0 ? V_VMIO : 0), td, 1);
1040 wouldcommit = biosize;
1044 NFSINCRGLOBAL(nfsstatsv1.biocache_writes);
1045 lbn = uio->uio_offset / biosize;
1046 on = uio->uio_offset - (lbn * biosize);
1047 n = MIN((unsigned)(biosize - on), uio->uio_resid);
1050 * Handle direct append and file extension cases, calculate
1051 * unaligned buffer size.
1054 if ((np->n_flag & NHASBEENLOCKED) == 0 &&
1055 (nmp->nm_flag & NFSMNT_NONCONTIGWR) != 0)
1056 noncontig_write = 1;
1058 noncontig_write = 0;
1059 if ((uio->uio_offset == np->n_size ||
1060 (noncontig_write != 0 &&
1061 lbn == (np->n_size / biosize) &&
1062 uio->uio_offset + n > np->n_size)) && n) {
1065 * Get the buffer (in its pre-append state to maintain
1066 * B_CACHE if it was previously set). Resize the
1067 * nfsnode after we have locked the buffer to prevent
1068 * readers from reading garbage.
1070 obcount = np->n_size - (lbn * biosize);
1071 bp = nfs_getcacheblk(vp, lbn, obcount, td);
1077 np->n_size = uio->uio_offset + n;
1078 np->n_flag |= NMODIFIED;
1079 np->n_flag &= ~NVNSETSZSKIP;
1080 vnode_pager_setsize(vp, np->n_size);
1083 save = bp->b_flags & B_CACHE;
1085 allocbuf(bp, bcount);
1086 bp->b_flags |= save;
1087 if (noncontig_write != 0 && on > obcount)
1088 vfs_bio_bzero_buf(bp, obcount, on -
1093 * Obtain the locked cache block first, and then
1094 * adjust the file's size as appropriate.
1097 if ((off_t)lbn * biosize + bcount < np->n_size) {
1098 if ((off_t)(lbn + 1) * biosize < np->n_size)
1101 bcount = np->n_size - (off_t)lbn * biosize;
1104 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1106 if (uio->uio_offset + n > np->n_size) {
1107 np->n_size = uio->uio_offset + n;
1108 np->n_flag |= NMODIFIED;
1109 np->n_flag &= ~NVNSETSZSKIP;
1110 vnode_pager_setsize(vp, np->n_size);
1116 error = newnfs_sigintr(nmp, td);
1123 * Issue a READ if B_CACHE is not set. In special-append
1124 * mode, B_CACHE is based on the buffer prior to the write
1125 * op and is typically set, avoiding the read. If a read
1126 * is required in special append mode, the server will
1127 * probably send us a short-read since we extended the file
1128 * on our end, resulting in b_resid == 0 and, thusly,
1129 * B_CACHE getting set.
1131 * We can also avoid issuing the read if the write covers
1132 * the entire buffer. We have to make sure the buffer state
1133 * is reasonable in this case since we will not be initiating
1134 * I/O. See the comments in kern/vfs_bio.c's getblk() for
1137 * B_CACHE may also be set due to the buffer being cached
1142 if (on == 0 && n == bcount) {
1143 if ((bp->b_flags & B_CACHE) == 0)
1145 bp->b_flags |= B_CACHE;
1146 bp->b_flags &= ~B_INVAL;
1147 bp->b_ioflags &= ~BIO_ERROR;
1150 if ((bp->b_flags & B_CACHE) == 0) {
1151 bp->b_iocmd = BIO_READ;
1152 vfs_busy_pages(bp, 0);
1153 error = ncl_doio(vp, bp, cred, td, 0);
1159 if (bp->b_wcred == NOCRED)
1160 bp->b_wcred = crhold(cred);
1162 np->n_flag |= NMODIFIED;
1166 * If dirtyend exceeds file size, chop it down. This should
1167 * not normally occur but there is an append race where it
1168 * might occur XXX, so we log it.
1170 * If the chopping creates a reverse-indexed or degenerate
1171 * situation with dirtyoff/end, we 0 both of them.
1174 if (bp->b_dirtyend > bcount) {
1175 printf("NFS append race @%lx:%d\n",
1176 (long)bp->b_blkno * DEV_BSIZE,
1177 bp->b_dirtyend - bcount);
1178 bp->b_dirtyend = bcount;
1181 if (bp->b_dirtyoff >= bp->b_dirtyend)
1182 bp->b_dirtyoff = bp->b_dirtyend = 0;
1185 * If the new write will leave a contiguous dirty
1186 * area, just update the b_dirtyoff and b_dirtyend,
1187 * otherwise force a write rpc of the old dirty area.
1189 * If there has been a file lock applied to this file
1190 * or vfs.nfs.old_noncontig_writing is set, do the following:
1191 * While it is possible to merge discontiguous writes due to
1192 * our having a B_CACHE buffer ( and thus valid read data
1193 * for the hole), we don't because it could lead to
1194 * significant cache coherency problems with multiple clients,
1195 * especially if locking is implemented later on.
1197 * If vfs.nfs.old_noncontig_writing is not set and there has
1198 * not been file locking done on this file:
1199 * Relax coherency a bit for the sake of performance and
1200 * expand the current dirty region to contain the new
1201 * write even if it means we mark some non-dirty data as
1205 if (noncontig_write == 0 && bp->b_dirtyend > 0 &&
1206 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
1207 if (bwrite(bp) == EINTR) {
1214 local_resid = uio->uio_resid;
1215 error = vn_io_fault_uiomove((char *)bp->b_data + on, n, uio);
1217 if (error != 0 && !bp_cached) {
1219 * This block has no other content then what
1220 * possibly was written by the faulty uiomove.
1221 * Release it, forgetting the data pages, to
1222 * prevent the leak of uninitialized data to
1225 bp->b_ioflags |= BIO_ERROR;
1227 uio->uio_offset -= local_resid - uio->uio_resid;
1228 uio->uio_resid = local_resid;
1233 * Since this block is being modified, it must be written
1234 * again and not just committed. Since write clustering does
1235 * not work for the stage 1 data write, only the stage 2
1236 * commit rpc, we have to clear B_CLUSTEROK as well.
1238 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1241 * Get the partial update on the progress made from
1242 * uiomove, if an error occurred.
1245 n = local_resid - uio->uio_resid;
1248 * Only update dirtyoff/dirtyend if not a degenerate
1252 if (bp->b_dirtyend > 0) {
1253 bp->b_dirtyoff = min(on, bp->b_dirtyoff);
1254 bp->b_dirtyend = max((on + n), bp->b_dirtyend);
1256 bp->b_dirtyoff = on;
1257 bp->b_dirtyend = on + n;
1259 vfs_bio_set_valid(bp, on, n);
1263 * If IO_SYNC do bwrite().
1265 * IO_INVAL appears to be unused. The idea appears to be
1266 * to turn off caching in this case. Very odd. XXX
1268 if ((ioflag & IO_SYNC)) {
1269 if (ioflag & IO_INVAL)
1270 bp->b_flags |= B_NOCACHE;
1271 error1 = bwrite(bp);
1277 } else if ((n + on) == biosize || (ioflag & IO_ASYNC) != 0) {
1278 bp->b_flags |= B_ASYNC;
1279 (void) ncl_writebp(bp, 0, NULL);
1286 } while (uio->uio_resid > 0 && n > 0);
1291 np->n_localmodtime = ts;
1294 if (ioflag & IO_UNIT) {
1296 vattr.va_size = orig_size;
1297 /* IO_SYNC is handled implicitely */
1298 (void)VOP_SETATTR(vp, &vattr, cred);
1299 uio->uio_offset -= orig_resid - uio->uio_resid;
1300 uio->uio_resid = orig_resid;
1305 curthread_pflags2_restore(save2);
1310 * Get an nfs cache block.
1312 * Allocate a new one if the block isn't currently in the cache
1313 * and return the block marked busy. If the calling process is
1314 * interrupted by a signal for an interruptible mount point, return
1317 * The caller must carefully deal with the possible B_INVAL state of
1318 * the buffer. ncl_doio() clears B_INVAL (and ncl_asyncio() clears it
1319 * indirectly), so synchronous reads can be issued without worrying about
1320 * the B_INVAL state. We have to be a little more careful when dealing
1321 * with writes (see comments in nfs_write()) when extending a file past
1325 nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct thread *td)
1329 struct nfsmount *nmp;
1334 if (nmp->nm_flag & NFSMNT_INT) {
1337 newnfs_set_sigmask(td, &oldset);
1338 bp = getblk(vp, bn, size, PCATCH, 0, 0);
1339 newnfs_restore_sigmask(td, &oldset);
1340 while (bp == NULL) {
1341 if (newnfs_sigintr(nmp, td))
1343 bp = getblk(vp, bn, size, 0, 2 * hz, 0);
1346 bp = getblk(vp, bn, size, 0, 0, 0);
1349 if (vp->v_type == VREG)
1350 bp->b_blkno = bn * (vp->v_bufobj.bo_bsize / DEV_BSIZE);
1355 * Flush and invalidate all dirty buffers. If another process is already
1356 * doing the flush, just wait for completion.
1359 ncl_vinvalbuf(struct vnode *vp, int flags, struct thread *td, int intrflg)
1361 struct nfsnode *np = VTONFS(vp);
1362 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1363 int error = 0, slpflag, slptimeo;
1367 ASSERT_VOP_LOCKED(vp, "ncl_vinvalbuf");
1369 if ((nmp->nm_flag & NFSMNT_INT) == 0)
1371 if (NFSCL_FORCEDISM(nmp->nm_mountp))
1381 old_lock = ncl_excl_start(vp);
1383 flags |= V_ALLOWCLEAN;
1386 * Now, flush as required.
1388 if ((flags & (V_SAVE | V_VMIO)) == V_SAVE &&
1389 vp->v_bufobj.bo_object != NULL) {
1390 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object);
1391 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
1392 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object);
1394 * If the page clean was interrupted, fail the invalidation.
1395 * Not doing so, we run the risk of losing dirty pages in the
1396 * vinvalbuf() call below.
1398 if (intrflg && (error = newnfs_sigintr(nmp, td)))
1402 error = vinvalbuf(vp, flags, slpflag, 0);
1404 if (intrflg && (error = newnfs_sigintr(nmp, td)))
1406 error = vinvalbuf(vp, flags, 0, slptimeo);
1408 if (NFSHASPNFS(nmp)) {
1409 nfscl_layoutcommit(vp, td);
1412 * Invalidate the attribute cache, since writes to a DS
1413 * won't update the size attribute.
1416 np->n_attrstamp = 0;
1421 if (np->n_directio_asyncwr == 0 && (np->n_flag & NMODIFIED) != 0) {
1422 np->n_localmodtime = ts;
1423 np->n_flag &= ~NMODIFIED;
1427 ncl_excl_finish(vp, old_lock);
1432 * Initiate asynchronous I/O. Return an error if no nfsiods are available.
1433 * This is mainly to avoid queueing async I/O requests when the nfsiods
1434 * are all hung on a dead server.
1436 * Note: ncl_asyncio() does not clear (BIO_ERROR|B_INVAL) but when the bp
1437 * is eventually dequeued by the async daemon, ncl_doio() *will*.
1440 ncl_asyncio(struct nfsmount *nmp, struct buf *bp, struct ucred *cred, struct thread *td)
1449 * Commits are usually short and sweet so lets save some cpu and
1450 * leave the async daemons for more important rpc's (such as reads
1453 * Readdirplus RPCs do vget()s to acquire the vnodes for entries
1454 * in the directory in order to update attributes. This can deadlock
1455 * with another thread that is waiting for async I/O to be done by
1456 * an nfsiod thread while holding a lock on one of these vnodes.
1457 * To avoid this deadlock, don't allow the async nfsiod threads to
1458 * perform Readdirplus RPCs.
1461 if ((bp->b_iocmd == BIO_WRITE && (bp->b_flags & B_NEEDCOMMIT) &&
1462 (nmp->nm_bufqiods > ncl_numasync / 2)) ||
1463 (bp->b_vp->v_type == VDIR && (nmp->nm_flag & NFSMNT_RDIRPLUS))) {
1468 if (nmp->nm_flag & NFSMNT_INT)
1473 * Find a free iod to process this request.
1475 for (iod = 0; iod < ncl_numasync; iod++)
1476 if (ncl_iodwant[iod] == NFSIOD_AVAILABLE) {
1482 * Try to create one if none are free.
1488 * Found one, so wake it up and tell it which
1491 NFS_DPF(ASYNCIO, ("ncl_asyncio: waking iod %d for mount %p\n",
1493 ncl_iodwant[iod] = NFSIOD_NOT_AVAILABLE;
1494 ncl_iodmount[iod] = nmp;
1496 wakeup(&ncl_iodwant[iod]);
1500 * If none are free, we may already have an iod working on this mount
1501 * point. If so, it will process our request.
1504 if (nmp->nm_bufqiods > 0) {
1506 ("ncl_asyncio: %d iods are already processing mount %p\n",
1507 nmp->nm_bufqiods, nmp));
1513 * If we have an iod which can process the request, then queue
1518 * Ensure that the queue never grows too large. We still want
1519 * to asynchronize so we block rather then return EIO.
1521 while (nmp->nm_bufqlen >= 2*ncl_numasync) {
1523 ("ncl_asyncio: waiting for mount %p queue to drain\n", nmp));
1524 nmp->nm_bufqwant = TRUE;
1525 error = newnfs_msleep(td, &nmp->nm_bufq,
1526 &ncl_iod_mutex, slpflag | PRIBIO, "nfsaio",
1529 error2 = newnfs_sigintr(nmp, td);
1534 if (slpflag == PCATCH) {
1540 * We might have lost our iod while sleeping,
1541 * so check and loop if necessary.
1546 /* We might have lost our nfsiod */
1547 if (nmp->nm_bufqiods == 0) {
1549 ("ncl_asyncio: no iods after mount %p queue was drained, looping\n", nmp));
1553 if (bp->b_iocmd == BIO_READ) {
1554 if (bp->b_rcred == NOCRED && cred != NOCRED)
1555 bp->b_rcred = crhold(cred);
1557 if (bp->b_wcred == NOCRED && cred != NOCRED)
1558 bp->b_wcred = crhold(cred);
1561 if (bp->b_flags & B_REMFREE)
1564 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist);
1566 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1567 NFSLOCKNODE(VTONFS(bp->b_vp));
1568 VTONFS(bp->b_vp)->n_flag |= NMODIFIED;
1569 VTONFS(bp->b_vp)->n_directio_asyncwr++;
1570 NFSUNLOCKNODE(VTONFS(bp->b_vp));
1579 * All the iods are busy on other mounts, so return EIO to
1580 * force the caller to process the i/o synchronously.
1582 NFS_DPF(ASYNCIO, ("ncl_asyncio: no iods available, i/o is synchronous\n"));
1587 ncl_doio_directwrite(struct buf *bp)
1589 int iomode, must_commit;
1590 struct uio *uiop = (struct uio *)bp->b_caller1;
1591 char *iov_base = uiop->uio_iov->iov_base;
1593 iomode = NFSWRITE_FILESYNC;
1594 uiop->uio_td = NULL; /* NULL since we're in nfsiod */
1595 ncl_writerpc(bp->b_vp, uiop, bp->b_wcred, &iomode, &must_commit, 0);
1596 KASSERT((must_commit == 0), ("ncl_doio_directwrite: Did not commit write"));
1597 free(iov_base, M_NFSDIRECTIO);
1598 free(uiop->uio_iov, M_NFSDIRECTIO);
1599 free(uiop, M_NFSDIRECTIO);
1600 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1601 struct nfsnode *np = VTONFS(bp->b_vp);
1603 if (NFSHASPNFS(VFSTONFS(bp->b_vp->v_mount))) {
1605 * Invalidate the attribute cache, since writes to a DS
1606 * won't update the size attribute.
1608 np->n_attrstamp = 0;
1610 np->n_directio_asyncwr--;
1611 if (np->n_directio_asyncwr == 0) {
1612 np->n_flag &= ~NMODIFIED;
1613 if ((np->n_flag & NFSYNCWAIT)) {
1614 np->n_flag &= ~NFSYNCWAIT;
1615 wakeup((caddr_t)&np->n_directio_asyncwr);
1621 uma_zfree(ncl_pbuf_zone, bp);
1625 * Do an I/O operation to/from a cache block. This may be called
1626 * synchronously or from an nfsiod.
1629 ncl_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td,
1630 int called_from_strategy)
1634 struct nfsmount *nmp;
1635 int error = 0, iomode, must_commit = 0;
1638 struct proc *p = td ? td->td_proc : NULL;
1642 nmp = VFSTONFS(vp->v_mount);
1644 uiop->uio_iov = &io;
1645 uiop->uio_iovcnt = 1;
1646 uiop->uio_segflg = UIO_SYSSPACE;
1650 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
1651 * do this here so we do not have to do it in all the code that
1654 bp->b_flags &= ~B_INVAL;
1655 bp->b_ioflags &= ~BIO_ERROR;
1657 KASSERT(!(bp->b_flags & B_DONE), ("ncl_doio: bp %p already marked done", bp));
1658 iocmd = bp->b_iocmd;
1659 if (iocmd == BIO_READ) {
1660 io.iov_len = uiop->uio_resid = bp->b_bcount;
1661 io.iov_base = bp->b_data;
1662 uiop->uio_rw = UIO_READ;
1664 switch (vp->v_type) {
1666 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
1667 NFSINCRGLOBAL(nfsstatsv1.read_bios);
1668 error = ncl_readrpc(vp, uiop, cr);
1671 if (uiop->uio_resid) {
1673 * If we had a short read with no error, we must have
1674 * hit a file hole. We should zero-fill the remainder.
1675 * This can also occur if the server hits the file EOF.
1677 * Holes used to be able to occur due to pending
1678 * writes, but that is not possible any longer.
1680 int nread = bp->b_bcount - uiop->uio_resid;
1681 ssize_t left = uiop->uio_resid;
1684 bzero((char *)bp->b_data + nread, left);
1685 uiop->uio_resid = 0;
1688 /* ASSERT_VOP_LOCKED(vp, "ncl_doio"); */
1689 if (p && vp->v_writecount <= -1) {
1691 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &np->n_vattr.na_mtime)) {
1694 killproc(p, "text file modification");
1701 uiop->uio_offset = (off_t)0;
1702 NFSINCRGLOBAL(nfsstatsv1.readlink_bios);
1703 error = ncl_readlinkrpc(vp, uiop, cr);
1706 NFSINCRGLOBAL(nfsstatsv1.readdir_bios);
1707 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
1708 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) != 0) {
1709 error = ncl_readdirplusrpc(vp, uiop, cr, td);
1710 if (error == NFSERR_NOTSUPP)
1711 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
1713 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
1714 error = ncl_readdirrpc(vp, uiop, cr, td);
1716 * end-of-directory sets B_INVAL but does not generate an
1719 if (error == 0 && uiop->uio_resid == bp->b_bcount)
1720 bp->b_flags |= B_INVAL;
1723 printf("ncl_doio: type %x unexpected\n", vp->v_type);
1727 bp->b_ioflags |= BIO_ERROR;
1728 bp->b_error = error;
1732 * If we only need to commit, try to commit
1734 if (bp->b_flags & B_NEEDCOMMIT) {
1738 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
1739 retv = ncl_commit(vp, off, bp->b_dirtyend-bp->b_dirtyoff,
1741 if (NFSCL_FORCEDISM(vp->v_mount) || retv == 0) {
1742 bp->b_dirtyoff = bp->b_dirtyend = 0;
1743 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1748 if (retv == NFSERR_STALEWRITEVERF) {
1749 ncl_clearcommit(vp->v_mount);
1754 * Setup for actual write
1757 if ((off_t)bp->b_blkno * DEV_BSIZE + bp->b_dirtyend > np->n_size)
1758 bp->b_dirtyend = np->n_size - (off_t)bp->b_blkno * DEV_BSIZE;
1761 if (bp->b_dirtyend > bp->b_dirtyoff) {
1762 io.iov_len = uiop->uio_resid = bp->b_dirtyend
1764 uiop->uio_offset = (off_t)bp->b_blkno * DEV_BSIZE
1766 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
1767 uiop->uio_rw = UIO_WRITE;
1768 NFSINCRGLOBAL(nfsstatsv1.write_bios);
1770 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC)
1771 iomode = NFSWRITE_UNSTABLE;
1773 iomode = NFSWRITE_FILESYNC;
1775 error = ncl_writerpc(vp, uiop, cr, &iomode, &must_commit,
1776 called_from_strategy);
1779 * When setting B_NEEDCOMMIT also set B_CLUSTEROK to try
1780 * to cluster the buffers needing commit. This will allow
1781 * the system to submit a single commit rpc for the whole
1782 * cluster. We can do this even if the buffer is not 100%
1783 * dirty (relative to the NFS blocksize), so we optimize the
1784 * append-to-file-case.
1786 * (when clearing B_NEEDCOMMIT, B_CLUSTEROK must also be
1787 * cleared because write clustering only works for commit
1788 * rpc's, not for the data portion of the write).
1791 if (!error && iomode == NFSWRITE_UNSTABLE) {
1792 bp->b_flags |= B_NEEDCOMMIT;
1793 if (bp->b_dirtyoff == 0
1794 && bp->b_dirtyend == bp->b_bcount)
1795 bp->b_flags |= B_CLUSTEROK;
1797 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1801 * For an interrupted write, the buffer is still valid
1802 * and the write hasn't been pushed to the server yet,
1803 * so we can't set BIO_ERROR and report the interruption
1804 * by setting B_EINTR. For the B_ASYNC case, B_EINTR
1805 * is not relevant, so the rpc attempt is essentially
1806 * a noop. For the case of a V3 write rpc not being
1807 * committed to stable storage, the block is still
1808 * dirty and requires either a commit rpc or another
1809 * write rpc with iomode == NFSV3WRITE_FILESYNC before
1810 * the block is reused. This is indicated by setting
1811 * the B_DELWRI and B_NEEDCOMMIT flags.
1813 * EIO is returned by ncl_writerpc() to indicate a recoverable
1814 * write error and is handled as above, except that
1815 * B_EINTR isn't set. One cause of this is a stale stateid
1816 * error for the RPC that indicates recovery is required,
1817 * when called with called_from_strategy != 0.
1819 * If the buffer is marked B_PAGING, it does not reside on
1820 * the vp's paging queues so we cannot call bdirty(). The
1821 * bp in this case is not an NFS cache block so we should
1824 * The logic below breaks up errors into recoverable and
1825 * unrecoverable. For the former, we clear B_INVAL|B_NOCACHE
1826 * and keep the buffer around for potential write retries.
1827 * For the latter (eg ESTALE), we toss the buffer away (B_INVAL)
1828 * and save the error in the nfsnode. This is less than ideal
1829 * but necessary. Keeping such buffers around could potentially
1830 * cause buffer exhaustion eventually (they can never be written
1831 * out, so will get constantly be re-dirtied). It also causes
1832 * all sorts of vfs panics. For non-recoverable write errors,
1833 * also invalidate the attrcache, so we'll be forced to go over
1834 * the wire for this object, returning an error to user on next
1835 * call (most of the time).
1837 if (error == EINTR || error == EIO || error == ETIMEDOUT
1838 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
1839 bp->b_flags &= ~(B_INVAL|B_NOCACHE);
1840 if ((bp->b_flags & B_PAGING) == 0) {
1842 bp->b_flags &= ~B_DONE;
1844 if ((error == EINTR || error == ETIMEDOUT) &&
1845 (bp->b_flags & B_ASYNC) == 0)
1846 bp->b_flags |= B_EINTR;
1849 bp->b_ioflags |= BIO_ERROR;
1850 bp->b_flags |= B_INVAL;
1851 bp->b_error = np->n_error = error;
1853 np->n_flag |= NWRITEERR;
1854 np->n_attrstamp = 0;
1855 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1858 bp->b_dirtyoff = bp->b_dirtyend = 0;
1866 bp->b_resid = uiop->uio_resid;
1868 ncl_clearcommit(vp->v_mount);
1874 * Used to aid in handling ftruncate() operations on the NFS client side.
1875 * Truncation creates a number of special problems for NFS. We have to
1876 * throw away VM pages and buffer cache buffers that are beyond EOF, and
1877 * we have to properly handle VM pages or (potentially dirty) buffers
1878 * that straddle the truncation point.
1882 ncl_meta_setsize(struct vnode *vp, struct thread *td, u_quad_t nsize)
1884 struct nfsnode *np = VTONFS(vp);
1886 int biosize = vp->v_bufobj.bo_bsize;
1894 if (nsize < tsize) {
1900 * vtruncbuf() doesn't get the buffer overlapping the
1901 * truncation point. We may have a B_DELWRI and/or B_CACHE
1902 * buffer that now needs to be truncated.
1904 error = vtruncbuf(vp, nsize, biosize);
1905 lbn = nsize / biosize;
1906 bufsize = nsize - (lbn * biosize);
1907 bp = nfs_getcacheblk(vp, lbn, bufsize, td);
1910 if (bp->b_dirtyoff > bp->b_bcount)
1911 bp->b_dirtyoff = bp->b_bcount;
1912 if (bp->b_dirtyend > bp->b_bcount)
1913 bp->b_dirtyend = bp->b_bcount;
1914 bp->b_flags |= B_RELBUF; /* don't leave garbage around */
1917 vnode_pager_setsize(vp, nsize);