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 int ncl_pbuf_freecnt = -1; /* start out unlimited */
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)
104 mtx_lock(&np->n_mtx);
106 mtx_unlock(&np->n_mtx);
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) {
147 mtx_lock(&np->n_mtx);
148 if ((np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
149 mtx_unlock(&np->n_mtx);
150 printf("ncl_getpages: called on non-cacheable vnode\n");
151 return (VM_PAGER_ERROR);
153 mtx_unlock(&np->n_mtx);
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 (pages[npages - 1]->valid != 0 && --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 = getpbuf(&ncl_pbuf_freecnt);
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 relpbuf(bp, &ncl_pbuf_freecnt);
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
230 m->valid = VM_PAGE_BITS_ALL;
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);
304 mtx_lock(&np->n_mtx);
305 if (newnfs_directio_enable && !newnfs_directio_allow_mmap &&
306 (np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
307 mtx_unlock(&np->n_mtx);
308 printf("ncl_putpages: called on noncache-able vnode\n");
309 mtx_lock(&np->n_mtx);
312 * When putting pages, do not extend file past EOF.
314 if (offset + count > np->n_size) {
315 count = np->n_size - offset;
319 mtx_unlock(&np->n_mtx);
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);
377 mtx_lock(&np->n_mtx);
378 if (np->n_flag & NMODIFIED) {
379 mtx_unlock(&np->n_mtx);
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);
393 mtx_lock(&np->n_mtx);
394 np->n_mtime = vattr.va_mtime;
395 mtx_unlock(&np->n_mtx);
397 mtx_unlock(&np->n_mtx);
398 error = VOP_GETATTR(vp, &vattr, cred);
401 mtx_lock(&np->n_mtx);
402 if ((np->n_flag & NSIZECHANGED)
403 || (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime))) {
404 mtx_unlock(&np->n_mtx);
405 if (vp->v_type == VDIR)
407 error = ncl_vinvalbuf(vp, V_SAVE | V_ALLOWCLEAN, td, 1);
410 mtx_lock(&np->n_mtx);
411 np->n_mtime = vattr.va_mtime;
412 np->n_flag &= ~NSIZECHANGED;
414 mtx_unlock(&np->n_mtx);
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);
429 struct buf *bp, *rabp;
431 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
435 int nra, error = 0, n = 0, on = 0;
438 KASSERT(uio->uio_rw == UIO_READ, ("ncl_read mode"));
439 if (uio->uio_resid == 0)
441 if (uio->uio_offset < 0) /* XXX VDIR cookies can be negative */
445 mtx_lock(&nmp->nm_mtx);
446 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
447 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
448 mtx_unlock(&nmp->nm_mtx);
449 (void)ncl_fsinfo(nmp, vp, cred, td);
450 mtx_lock(&nmp->nm_mtx);
452 if (nmp->nm_rsize == 0 || nmp->nm_readdirsize == 0)
453 (void) newnfs_iosize(nmp);
455 tmp_off = uio->uio_offset + uio->uio_resid;
456 if (vp->v_type != VDIR &&
457 (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)) {
458 mtx_unlock(&nmp->nm_mtx);
461 mtx_unlock(&nmp->nm_mtx);
463 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && (vp->v_type == VREG))
464 /* No caching/ no readaheads. Just read data into the user buffer */
465 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);
477 mtx_lock(&np->n_mtx);
479 mtx_unlock(&np->n_mtx);
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);
498 return (error ? error : EINTR);
500 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
501 rabp->b_flags |= B_ASYNC;
502 rabp->b_iocmd = BIO_READ;
503 vfs_busy_pages(rabp, 0);
504 if (ncl_asyncio(nmp, rabp, cred, td)) {
505 rabp->b_flags |= B_INVAL;
506 rabp->b_ioflags |= BIO_ERROR;
507 vfs_unbusy_pages(rabp);
518 /* Note that bcount is *not* DEV_BSIZE aligned. */
520 if ((off_t)lbn * biosize >= nsize) {
522 } else if ((off_t)(lbn + 1) * biosize > nsize) {
523 bcount = nsize - (off_t)lbn * biosize;
525 bp = nfs_getcacheblk(vp, lbn, bcount, td);
528 error = newnfs_sigintr(nmp, td);
529 return (error ? error : EINTR);
533 * If B_CACHE is not set, we must issue the read. If this
534 * fails, we return an error.
537 if ((bp->b_flags & B_CACHE) == 0) {
538 bp->b_iocmd = BIO_READ;
539 vfs_busy_pages(bp, 0);
540 error = ncl_doio(vp, bp, cred, td, 0);
548 * on is the offset into the current bp. Figure out how many
549 * bytes we can copy out of the bp. Note that bcount is
550 * NOT DEV_BSIZE aligned.
552 * Then figure out how many bytes we can copy into the uio.
557 n = MIN((unsigned)(bcount - on), uio->uio_resid);
560 NFSINCRGLOBAL(nfsstatsv1.biocache_readlinks);
561 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, td);
563 error = newnfs_sigintr(nmp, td);
564 return (error ? error : EINTR);
566 if ((bp->b_flags & B_CACHE) == 0) {
567 bp->b_iocmd = BIO_READ;
568 vfs_busy_pages(bp, 0);
569 error = ncl_doio(vp, bp, cred, td, 0);
571 bp->b_ioflags |= BIO_ERROR;
576 n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
580 NFSINCRGLOBAL(nfsstatsv1.biocache_readdirs);
581 if (np->n_direofoffset
582 && uio->uio_offset >= np->n_direofoffset) {
585 lbn = (uoff_t)uio->uio_offset / NFS_DIRBLKSIZ;
586 on = uio->uio_offset & (NFS_DIRBLKSIZ - 1);
587 bp = nfs_getcacheblk(vp, lbn, NFS_DIRBLKSIZ, td);
589 error = newnfs_sigintr(nmp, td);
590 return (error ? error : EINTR);
592 if ((bp->b_flags & B_CACHE) == 0) {
593 bp->b_iocmd = BIO_READ;
594 vfs_busy_pages(bp, 0);
595 error = ncl_doio(vp, bp, cred, td, 0);
599 while (error == NFSERR_BAD_COOKIE) {
601 error = ncl_vinvalbuf(vp, 0, td, 1);
604 * Yuck! The directory has been modified on the
605 * server. The only way to get the block is by
606 * reading from the beginning to get all the
609 * Leave the last bp intact unless there is an error.
610 * Loop back up to the while if the error is another
611 * NFSERR_BAD_COOKIE (double yuch!).
613 for (i = 0; i <= lbn && !error; i++) {
614 if (np->n_direofoffset
615 && (i * NFS_DIRBLKSIZ) >= np->n_direofoffset)
617 bp = nfs_getcacheblk(vp, i, NFS_DIRBLKSIZ, td);
619 error = newnfs_sigintr(nmp, td);
620 return (error ? error : EINTR);
622 if ((bp->b_flags & B_CACHE) == 0) {
623 bp->b_iocmd = BIO_READ;
624 vfs_busy_pages(bp, 0);
625 error = ncl_doio(vp, bp, cred, td, 0);
627 * no error + B_INVAL == directory EOF,
630 if (error == 0 && (bp->b_flags & B_INVAL))
634 * An error will throw away the block and the
635 * for loop will break out. If no error and this
636 * is not the block we want, we throw away the
637 * block and go for the next one via the for loop.
639 if (error || i < lbn)
644 * The above while is repeated if we hit another cookie
645 * error. If we hit an error and it wasn't a cookie error,
653 * If not eof and read aheads are enabled, start one.
654 * (You need the current block first, so that you have the
655 * directory offset cookie of the next block.)
657 if (nmp->nm_readahead > 0 &&
658 (bp->b_flags & B_INVAL) == 0 &&
659 (np->n_direofoffset == 0 ||
660 (lbn + 1) * NFS_DIRBLKSIZ < np->n_direofoffset) &&
661 incore(&vp->v_bufobj, lbn + 1) == NULL) {
662 rabp = nfs_getcacheblk(vp, lbn + 1, NFS_DIRBLKSIZ, td);
664 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
665 rabp->b_flags |= B_ASYNC;
666 rabp->b_iocmd = BIO_READ;
667 vfs_busy_pages(rabp, 0);
668 if (ncl_asyncio(nmp, rabp, cred, td)) {
669 rabp->b_flags |= B_INVAL;
670 rabp->b_ioflags |= BIO_ERROR;
671 vfs_unbusy_pages(rabp);
680 * Unlike VREG files, whos buffer size ( bp->b_bcount ) is
681 * chopped for the EOF condition, we cannot tell how large
682 * NFS directories are going to be until we hit EOF. So
683 * an NFS directory buffer is *not* chopped to its EOF. Now,
684 * it just so happens that b_resid will effectively chop it
685 * to EOF. *BUT* this information is lost if the buffer goes
686 * away and is reconstituted into a B_CACHE state ( due to
687 * being VMIO ) later. So we keep track of the directory eof
688 * in np->n_direofoffset and chop it off as an extra step
691 n = lmin(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid - on);
692 if (np->n_direofoffset && n > np->n_direofoffset - uio->uio_offset)
693 n = np->n_direofoffset - uio->uio_offset;
696 printf(" ncl_bioread: type %x unexpected\n", vp->v_type);
702 error = vn_io_fault_uiomove(bp->b_data + on, (int)n, uio);
704 if (vp->v_type == VLNK)
708 } while (error == 0 && uio->uio_resid > 0 && n > 0);
713 * The NFS write path cannot handle iovecs with len > 1. So we need to
714 * break up iovecs accordingly (restricting them to wsize).
715 * For the SYNC case, we can do this with 1 copy (user buffer -> mbuf).
716 * For the ASYNC case, 2 copies are needed. The first a copy from the
717 * user buffer to a staging buffer and then a second copy from the staging
718 * buffer to mbufs. This can be optimized by copying from the user buffer
719 * directly into mbufs and passing the chain down, but that requires a
720 * fair amount of re-working of the relevant codepaths (and can be done
724 nfs_directio_write(vp, uiop, cred, ioflag)
731 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
732 struct thread *td = uiop->uio_td;
736 mtx_lock(&nmp->nm_mtx);
737 wsize = nmp->nm_wsize;
738 mtx_unlock(&nmp->nm_mtx);
739 if (ioflag & IO_SYNC) {
740 int iomode, must_commit;
744 while (uiop->uio_resid > 0) {
745 size = MIN(uiop->uio_resid, wsize);
746 size = MIN(uiop->uio_iov->iov_len, size);
747 iov.iov_base = uiop->uio_iov->iov_base;
751 uio.uio_offset = uiop->uio_offset;
752 uio.uio_resid = size;
753 uio.uio_segflg = UIO_USERSPACE;
754 uio.uio_rw = UIO_WRITE;
756 iomode = NFSWRITE_FILESYNC;
757 error = ncl_writerpc(vp, &uio, cred, &iomode,
759 KASSERT((must_commit == 0),
760 ("ncl_directio_write: Did not commit write"));
763 uiop->uio_offset += size;
764 uiop->uio_resid -= size;
765 if (uiop->uio_iov->iov_len <= size) {
769 uiop->uio_iov->iov_base =
770 (char *)uiop->uio_iov->iov_base + size;
771 uiop->uio_iov->iov_len -= size;
780 * Break up the write into blocksize chunks and hand these
781 * over to nfsiod's for write back.
782 * Unfortunately, this incurs a copy of the data. Since
783 * the user could modify the buffer before the write is
786 * The obvious optimization here is that one of the 2 copies
787 * in the async write path can be eliminated by copying the
788 * data here directly into mbufs and passing the mbuf chain
789 * down. But that will require a fair amount of re-working
790 * of the code and can be done if there's enough interest
791 * in NFS directio access.
793 while (uiop->uio_resid > 0) {
794 size = MIN(uiop->uio_resid, wsize);
795 size = MIN(uiop->uio_iov->iov_len, size);
796 bp = getpbuf(&ncl_pbuf_freecnt);
797 t_uio = malloc(sizeof(struct uio), M_NFSDIRECTIO, M_WAITOK);
798 t_iov = malloc(sizeof(struct iovec), M_NFSDIRECTIO, M_WAITOK);
799 t_iov->iov_base = malloc(size, M_NFSDIRECTIO, M_WAITOK);
800 t_iov->iov_len = size;
801 t_uio->uio_iov = t_iov;
802 t_uio->uio_iovcnt = 1;
803 t_uio->uio_offset = uiop->uio_offset;
804 t_uio->uio_resid = size;
805 t_uio->uio_segflg = UIO_SYSSPACE;
806 t_uio->uio_rw = UIO_WRITE;
808 KASSERT(uiop->uio_segflg == UIO_USERSPACE ||
809 uiop->uio_segflg == UIO_SYSSPACE,
810 ("nfs_directio_write: Bad uio_segflg"));
811 if (uiop->uio_segflg == UIO_USERSPACE) {
812 error = copyin(uiop->uio_iov->iov_base,
813 t_iov->iov_base, size);
818 * UIO_SYSSPACE may never happen, but handle
819 * it just in case it does.
821 bcopy(uiop->uio_iov->iov_base, t_iov->iov_base,
823 bp->b_flags |= B_DIRECT;
824 bp->b_iocmd = BIO_WRITE;
825 if (cred != NOCRED) {
829 bp->b_wcred = NOCRED;
830 bp->b_caller1 = (void *)t_uio;
832 error = ncl_asyncio(nmp, bp, NOCRED, td);
835 free(t_iov->iov_base, M_NFSDIRECTIO);
836 free(t_iov, M_NFSDIRECTIO);
837 free(t_uio, M_NFSDIRECTIO);
839 relpbuf(bp, &ncl_pbuf_freecnt);
844 uiop->uio_offset += size;
845 uiop->uio_resid -= size;
846 if (uiop->uio_iov->iov_len <= size) {
850 uiop->uio_iov->iov_base =
851 (char *)uiop->uio_iov->iov_base + size;
852 uiop->uio_iov->iov_len -= size;
860 * Vnode op for write using bio
863 ncl_write(struct vop_write_args *ap)
866 struct uio *uio = ap->a_uio;
867 struct thread *td = uio->uio_td;
868 struct vnode *vp = ap->a_vp;
869 struct nfsnode *np = VTONFS(vp);
870 struct ucred *cred = ap->a_cred;
871 int ioflag = ap->a_ioflag;
874 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
876 int bcount, noncontig_write, obcount;
877 int bp_cached, n, on, error = 0, error1, wouldcommit;
878 size_t orig_resid, local_resid;
879 off_t orig_size, tmp_off;
881 KASSERT(uio->uio_rw == UIO_WRITE, ("ncl_write mode"));
882 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
884 if (vp->v_type != VREG)
886 mtx_lock(&np->n_mtx);
887 if (np->n_flag & NWRITEERR) {
888 np->n_flag &= ~NWRITEERR;
889 mtx_unlock(&np->n_mtx);
890 return (np->n_error);
892 mtx_unlock(&np->n_mtx);
893 mtx_lock(&nmp->nm_mtx);
894 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
895 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
896 mtx_unlock(&nmp->nm_mtx);
897 (void)ncl_fsinfo(nmp, vp, cred, td);
898 mtx_lock(&nmp->nm_mtx);
900 if (nmp->nm_wsize == 0)
901 (void) newnfs_iosize(nmp);
902 mtx_unlock(&nmp->nm_mtx);
905 * Synchronously flush pending buffers if we are in synchronous
906 * mode or if we are appending.
908 if (ioflag & (IO_APPEND | IO_SYNC)) {
909 mtx_lock(&np->n_mtx);
910 if (np->n_flag & NMODIFIED) {
911 mtx_unlock(&np->n_mtx);
912 #ifdef notyet /* Needs matching nonblock semantics elsewhere, too. */
914 * Require non-blocking, synchronous writes to
915 * dirty files to inform the program it needs
916 * to fsync(2) explicitly.
918 if (ioflag & IO_NDELAY)
922 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
923 error = ncl_vinvalbuf(vp, V_SAVE | ((ioflag &
924 IO_VMIO) != 0 ? V_VMIO : 0), td, 1);
928 mtx_unlock(&np->n_mtx);
931 orig_resid = uio->uio_resid;
932 mtx_lock(&np->n_mtx);
933 orig_size = np->n_size;
934 mtx_unlock(&np->n_mtx);
937 * If IO_APPEND then load uio_offset. We restart here if we cannot
938 * get the append lock.
940 if (ioflag & IO_APPEND) {
942 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
943 error = VOP_GETATTR(vp, &vattr, cred);
946 mtx_lock(&np->n_mtx);
947 uio->uio_offset = np->n_size;
948 mtx_unlock(&np->n_mtx);
951 if (uio->uio_offset < 0)
953 tmp_off = uio->uio_offset + uio->uio_resid;
954 if (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)
956 if (uio->uio_resid == 0)
959 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && vp->v_type == VREG)
960 return nfs_directio_write(vp, uio, cred, ioflag);
963 * Maybe this should be above the vnode op call, but so long as
964 * file servers have no limits, i don't think it matters
966 if (vn_rlimit_fsize(vp, uio, td))
969 biosize = vp->v_bufobj.bo_bsize;
971 * Find all of this file's B_NEEDCOMMIT buffers. If our writes
972 * would exceed the local maximum per-file write commit size when
973 * combined with those, we must decide whether to flush,
974 * go synchronous, or return error. We don't bother checking
975 * IO_UNIT -- we just make all writes atomic anyway, as there's
976 * no point optimizing for something that really won't ever happen.
979 if (!(ioflag & IO_SYNC)) {
982 mtx_lock(&np->n_mtx);
984 mtx_unlock(&np->n_mtx);
985 if (nflag & NMODIFIED) {
986 BO_LOCK(&vp->v_bufobj);
987 if (vp->v_bufobj.bo_dirty.bv_cnt != 0) {
988 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd,
990 if (bp->b_flags & B_NEEDCOMMIT)
991 wouldcommit += bp->b_bcount;
994 BO_UNLOCK(&vp->v_bufobj);
999 if (!(ioflag & IO_SYNC)) {
1000 wouldcommit += biosize;
1001 if (wouldcommit > nmp->nm_wcommitsize) {
1002 np->n_attrstamp = 0;
1003 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1004 error = ncl_vinvalbuf(vp, V_SAVE | ((ioflag &
1005 IO_VMIO) != 0 ? V_VMIO : 0), td, 1);
1008 wouldcommit = biosize;
1012 NFSINCRGLOBAL(nfsstatsv1.biocache_writes);
1013 lbn = uio->uio_offset / biosize;
1014 on = uio->uio_offset - (lbn * biosize);
1015 n = MIN((unsigned)(biosize - on), uio->uio_resid);
1018 * Handle direct append and file extension cases, calculate
1019 * unaligned buffer size.
1021 mtx_lock(&np->n_mtx);
1022 if ((np->n_flag & NHASBEENLOCKED) == 0 &&
1023 (nmp->nm_flag & NFSMNT_NONCONTIGWR) != 0)
1024 noncontig_write = 1;
1026 noncontig_write = 0;
1027 if ((uio->uio_offset == np->n_size ||
1028 (noncontig_write != 0 &&
1029 lbn == (np->n_size / biosize) &&
1030 uio->uio_offset + n > np->n_size)) && n) {
1031 mtx_unlock(&np->n_mtx);
1033 * Get the buffer (in its pre-append state to maintain
1034 * B_CACHE if it was previously set). Resize the
1035 * nfsnode after we have locked the buffer to prevent
1036 * readers from reading garbage.
1038 obcount = np->n_size - (lbn * biosize);
1039 bp = nfs_getcacheblk(vp, lbn, obcount, td);
1044 mtx_lock(&np->n_mtx);
1045 np->n_size = uio->uio_offset + n;
1046 np->n_flag |= NMODIFIED;
1047 vnode_pager_setsize(vp, np->n_size);
1048 mtx_unlock(&np->n_mtx);
1050 save = bp->b_flags & B_CACHE;
1052 allocbuf(bp, bcount);
1053 bp->b_flags |= save;
1054 if (noncontig_write != 0 && on > obcount)
1055 vfs_bio_bzero_buf(bp, obcount, on -
1060 * Obtain the locked cache block first, and then
1061 * adjust the file's size as appropriate.
1064 if ((off_t)lbn * biosize + bcount < np->n_size) {
1065 if ((off_t)(lbn + 1) * biosize < np->n_size)
1068 bcount = np->n_size - (off_t)lbn * biosize;
1070 mtx_unlock(&np->n_mtx);
1071 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1072 mtx_lock(&np->n_mtx);
1073 if (uio->uio_offset + n > np->n_size) {
1074 np->n_size = uio->uio_offset + n;
1075 np->n_flag |= NMODIFIED;
1076 vnode_pager_setsize(vp, np->n_size);
1078 mtx_unlock(&np->n_mtx);
1082 error = newnfs_sigintr(nmp, td);
1089 * Issue a READ if B_CACHE is not set. In special-append
1090 * mode, B_CACHE is based on the buffer prior to the write
1091 * op and is typically set, avoiding the read. If a read
1092 * is required in special append mode, the server will
1093 * probably send us a short-read since we extended the file
1094 * on our end, resulting in b_resid == 0 and, thusly,
1095 * B_CACHE getting set.
1097 * We can also avoid issuing the read if the write covers
1098 * the entire buffer. We have to make sure the buffer state
1099 * is reasonable in this case since we will not be initiating
1100 * I/O. See the comments in kern/vfs_bio.c's getblk() for
1103 * B_CACHE may also be set due to the buffer being cached
1108 if (on == 0 && n == bcount) {
1109 if ((bp->b_flags & B_CACHE) == 0)
1111 bp->b_flags |= B_CACHE;
1112 bp->b_flags &= ~B_INVAL;
1113 bp->b_ioflags &= ~BIO_ERROR;
1116 if ((bp->b_flags & B_CACHE) == 0) {
1117 bp->b_iocmd = BIO_READ;
1118 vfs_busy_pages(bp, 0);
1119 error = ncl_doio(vp, bp, cred, td, 0);
1125 if (bp->b_wcred == NOCRED)
1126 bp->b_wcred = crhold(cred);
1127 mtx_lock(&np->n_mtx);
1128 np->n_flag |= NMODIFIED;
1129 mtx_unlock(&np->n_mtx);
1132 * If dirtyend exceeds file size, chop it down. This should
1133 * not normally occur but there is an append race where it
1134 * might occur XXX, so we log it.
1136 * If the chopping creates a reverse-indexed or degenerate
1137 * situation with dirtyoff/end, we 0 both of them.
1140 if (bp->b_dirtyend > bcount) {
1141 printf("NFS append race @%lx:%d\n",
1142 (long)bp->b_blkno * DEV_BSIZE,
1143 bp->b_dirtyend - bcount);
1144 bp->b_dirtyend = bcount;
1147 if (bp->b_dirtyoff >= bp->b_dirtyend)
1148 bp->b_dirtyoff = bp->b_dirtyend = 0;
1151 * If the new write will leave a contiguous dirty
1152 * area, just update the b_dirtyoff and b_dirtyend,
1153 * otherwise force a write rpc of the old dirty area.
1155 * If there has been a file lock applied to this file
1156 * or vfs.nfs.old_noncontig_writing is set, do the following:
1157 * While it is possible to merge discontiguous writes due to
1158 * our having a B_CACHE buffer ( and thus valid read data
1159 * for the hole), we don't because it could lead to
1160 * significant cache coherency problems with multiple clients,
1161 * especially if locking is implemented later on.
1163 * If vfs.nfs.old_noncontig_writing is not set and there has
1164 * not been file locking done on this file:
1165 * Relax coherency a bit for the sake of performance and
1166 * expand the current dirty region to contain the new
1167 * write even if it means we mark some non-dirty data as
1171 if (noncontig_write == 0 && bp->b_dirtyend > 0 &&
1172 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
1173 if (bwrite(bp) == EINTR) {
1180 local_resid = uio->uio_resid;
1181 error = vn_io_fault_uiomove((char *)bp->b_data + on, n, uio);
1183 if (error != 0 && !bp_cached) {
1185 * This block has no other content then what
1186 * possibly was written by the faulty uiomove.
1187 * Release it, forgetting the data pages, to
1188 * prevent the leak of uninitialized data to
1191 bp->b_ioflags |= BIO_ERROR;
1193 uio->uio_offset -= local_resid - uio->uio_resid;
1194 uio->uio_resid = local_resid;
1199 * Since this block is being modified, it must be written
1200 * again and not just committed. Since write clustering does
1201 * not work for the stage 1 data write, only the stage 2
1202 * commit rpc, we have to clear B_CLUSTEROK as well.
1204 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1207 * Get the partial update on the progress made from
1208 * uiomove, if an error occurred.
1211 n = local_resid - uio->uio_resid;
1214 * Only update dirtyoff/dirtyend if not a degenerate
1218 if (bp->b_dirtyend > 0) {
1219 bp->b_dirtyoff = min(on, bp->b_dirtyoff);
1220 bp->b_dirtyend = max((on + n), bp->b_dirtyend);
1222 bp->b_dirtyoff = on;
1223 bp->b_dirtyend = on + n;
1225 vfs_bio_set_valid(bp, on, n);
1229 * If IO_SYNC do bwrite().
1231 * IO_INVAL appears to be unused. The idea appears to be
1232 * to turn off caching in this case. Very odd. XXX
1234 if ((ioflag & IO_SYNC)) {
1235 if (ioflag & IO_INVAL)
1236 bp->b_flags |= B_NOCACHE;
1237 error1 = bwrite(bp);
1243 } else if ((n + on) == biosize || (ioflag & IO_ASYNC) != 0) {
1244 bp->b_flags |= B_ASYNC;
1245 (void) ncl_writebp(bp, 0, NULL);
1252 } while (uio->uio_resid > 0 && n > 0);
1255 if (ioflag & IO_UNIT) {
1257 vattr.va_size = orig_size;
1258 /* IO_SYNC is handled implicitely */
1259 (void)VOP_SETATTR(vp, &vattr, cred);
1260 uio->uio_offset -= orig_resid - uio->uio_resid;
1261 uio->uio_resid = orig_resid;
1269 * Get an nfs cache block.
1271 * Allocate a new one if the block isn't currently in the cache
1272 * and return the block marked busy. If the calling process is
1273 * interrupted by a signal for an interruptible mount point, return
1276 * The caller must carefully deal with the possible B_INVAL state of
1277 * the buffer. ncl_doio() clears B_INVAL (and ncl_asyncio() clears it
1278 * indirectly), so synchronous reads can be issued without worrying about
1279 * the B_INVAL state. We have to be a little more careful when dealing
1280 * with writes (see comments in nfs_write()) when extending a file past
1284 nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct thread *td)
1288 struct nfsmount *nmp;
1293 if (nmp->nm_flag & NFSMNT_INT) {
1296 newnfs_set_sigmask(td, &oldset);
1297 bp = getblk(vp, bn, size, PCATCH, 0, 0);
1298 newnfs_restore_sigmask(td, &oldset);
1299 while (bp == NULL) {
1300 if (newnfs_sigintr(nmp, td))
1302 bp = getblk(vp, bn, size, 0, 2 * hz, 0);
1305 bp = getblk(vp, bn, size, 0, 0, 0);
1308 if (vp->v_type == VREG)
1309 bp->b_blkno = bn * (vp->v_bufobj.bo_bsize / DEV_BSIZE);
1314 * Flush and invalidate all dirty buffers. If another process is already
1315 * doing the flush, just wait for completion.
1318 ncl_vinvalbuf(struct vnode *vp, int flags, struct thread *td, int intrflg)
1320 struct nfsnode *np = VTONFS(vp);
1321 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1322 int error = 0, slpflag, slptimeo;
1325 ASSERT_VOP_LOCKED(vp, "ncl_vinvalbuf");
1327 if ((nmp->nm_flag & NFSMNT_INT) == 0)
1329 if (NFSCL_FORCEDISM(nmp->nm_mountp))
1339 old_lock = ncl_excl_start(vp);
1341 flags |= V_ALLOWCLEAN;
1344 * Now, flush as required.
1346 if ((flags & (V_SAVE | V_VMIO)) == V_SAVE &&
1347 vp->v_bufobj.bo_object != NULL) {
1348 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object);
1349 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
1350 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object);
1352 * If the page clean was interrupted, fail the invalidation.
1353 * Not doing so, we run the risk of losing dirty pages in the
1354 * vinvalbuf() call below.
1356 if (intrflg && (error = newnfs_sigintr(nmp, td)))
1360 error = vinvalbuf(vp, flags, slpflag, 0);
1362 if (intrflg && (error = newnfs_sigintr(nmp, td)))
1364 error = vinvalbuf(vp, flags, 0, slptimeo);
1366 if (NFSHASPNFS(nmp)) {
1367 nfscl_layoutcommit(vp, td);
1369 * Invalidate the attribute cache, since writes to a DS
1370 * won't update the size attribute.
1372 mtx_lock(&np->n_mtx);
1373 np->n_attrstamp = 0;
1375 mtx_lock(&np->n_mtx);
1376 if (np->n_directio_asyncwr == 0)
1377 np->n_flag &= ~NMODIFIED;
1378 mtx_unlock(&np->n_mtx);
1380 ncl_excl_finish(vp, old_lock);
1385 * Initiate asynchronous I/O. Return an error if no nfsiods are available.
1386 * This is mainly to avoid queueing async I/O requests when the nfsiods
1387 * are all hung on a dead server.
1389 * Note: ncl_asyncio() does not clear (BIO_ERROR|B_INVAL) but when the bp
1390 * is eventually dequeued by the async daemon, ncl_doio() *will*.
1393 ncl_asyncio(struct nfsmount *nmp, struct buf *bp, struct ucred *cred, struct thread *td)
1402 * Commits are usually short and sweet so lets save some cpu and
1403 * leave the async daemons for more important rpc's (such as reads
1406 * Readdirplus RPCs do vget()s to acquire the vnodes for entries
1407 * in the directory in order to update attributes. This can deadlock
1408 * with another thread that is waiting for async I/O to be done by
1409 * an nfsiod thread while holding a lock on one of these vnodes.
1410 * To avoid this deadlock, don't allow the async nfsiod threads to
1411 * perform Readdirplus RPCs.
1413 mtx_lock(&ncl_iod_mutex);
1414 if ((bp->b_iocmd == BIO_WRITE && (bp->b_flags & B_NEEDCOMMIT) &&
1415 (nmp->nm_bufqiods > ncl_numasync / 2)) ||
1416 (bp->b_vp->v_type == VDIR && (nmp->nm_flag & NFSMNT_RDIRPLUS))) {
1417 mtx_unlock(&ncl_iod_mutex);
1421 if (nmp->nm_flag & NFSMNT_INT)
1426 * Find a free iod to process this request.
1428 for (iod = 0; iod < ncl_numasync; iod++)
1429 if (ncl_iodwant[iod] == NFSIOD_AVAILABLE) {
1435 * Try to create one if none are free.
1441 * Found one, so wake it up and tell it which
1444 NFS_DPF(ASYNCIO, ("ncl_asyncio: waking iod %d for mount %p\n",
1446 ncl_iodwant[iod] = NFSIOD_NOT_AVAILABLE;
1447 ncl_iodmount[iod] = nmp;
1449 wakeup(&ncl_iodwant[iod]);
1453 * If none are free, we may already have an iod working on this mount
1454 * point. If so, it will process our request.
1457 if (nmp->nm_bufqiods > 0) {
1459 ("ncl_asyncio: %d iods are already processing mount %p\n",
1460 nmp->nm_bufqiods, nmp));
1466 * If we have an iod which can process the request, then queue
1471 * Ensure that the queue never grows too large. We still want
1472 * to asynchronize so we block rather then return EIO.
1474 while (nmp->nm_bufqlen >= 2*ncl_numasync) {
1476 ("ncl_asyncio: waiting for mount %p queue to drain\n", nmp));
1477 nmp->nm_bufqwant = TRUE;
1478 error = newnfs_msleep(td, &nmp->nm_bufq,
1479 &ncl_iod_mutex, slpflag | PRIBIO, "nfsaio",
1482 error2 = newnfs_sigintr(nmp, td);
1484 mtx_unlock(&ncl_iod_mutex);
1487 if (slpflag == PCATCH) {
1493 * We might have lost our iod while sleeping,
1494 * so check and loop if necessary.
1499 /* We might have lost our nfsiod */
1500 if (nmp->nm_bufqiods == 0) {
1502 ("ncl_asyncio: no iods after mount %p queue was drained, looping\n", nmp));
1506 if (bp->b_iocmd == BIO_READ) {
1507 if (bp->b_rcred == NOCRED && cred != NOCRED)
1508 bp->b_rcred = crhold(cred);
1510 if (bp->b_wcred == NOCRED && cred != NOCRED)
1511 bp->b_wcred = crhold(cred);
1514 if (bp->b_flags & B_REMFREE)
1517 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist);
1519 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1520 mtx_lock(&(VTONFS(bp->b_vp))->n_mtx);
1521 VTONFS(bp->b_vp)->n_flag |= NMODIFIED;
1522 VTONFS(bp->b_vp)->n_directio_asyncwr++;
1523 mtx_unlock(&(VTONFS(bp->b_vp))->n_mtx);
1525 mtx_unlock(&ncl_iod_mutex);
1529 mtx_unlock(&ncl_iod_mutex);
1532 * All the iods are busy on other mounts, so return EIO to
1533 * force the caller to process the i/o synchronously.
1535 NFS_DPF(ASYNCIO, ("ncl_asyncio: no iods available, i/o is synchronous\n"));
1540 ncl_doio_directwrite(struct buf *bp)
1542 int iomode, must_commit;
1543 struct uio *uiop = (struct uio *)bp->b_caller1;
1544 char *iov_base = uiop->uio_iov->iov_base;
1546 iomode = NFSWRITE_FILESYNC;
1547 uiop->uio_td = NULL; /* NULL since we're in nfsiod */
1548 ncl_writerpc(bp->b_vp, uiop, bp->b_wcred, &iomode, &must_commit, 0);
1549 KASSERT((must_commit == 0), ("ncl_doio_directwrite: Did not commit write"));
1550 free(iov_base, M_NFSDIRECTIO);
1551 free(uiop->uio_iov, M_NFSDIRECTIO);
1552 free(uiop, M_NFSDIRECTIO);
1553 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1554 struct nfsnode *np = VTONFS(bp->b_vp);
1555 mtx_lock(&np->n_mtx);
1556 if (NFSHASPNFS(VFSTONFS(vnode_mount(bp->b_vp)))) {
1558 * Invalidate the attribute cache, since writes to a DS
1559 * won't update the size attribute.
1561 np->n_attrstamp = 0;
1563 np->n_directio_asyncwr--;
1564 if (np->n_directio_asyncwr == 0) {
1565 np->n_flag &= ~NMODIFIED;
1566 if ((np->n_flag & NFSYNCWAIT)) {
1567 np->n_flag &= ~NFSYNCWAIT;
1568 wakeup((caddr_t)&np->n_directio_asyncwr);
1571 mtx_unlock(&np->n_mtx);
1574 relpbuf(bp, &ncl_pbuf_freecnt);
1578 * Do an I/O operation to/from a cache block. This may be called
1579 * synchronously or from an nfsiod.
1582 ncl_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td,
1583 int called_from_strategy)
1587 struct nfsmount *nmp;
1588 int error = 0, iomode, must_commit = 0;
1591 struct proc *p = td ? td->td_proc : NULL;
1595 nmp = VFSTONFS(vp->v_mount);
1597 uiop->uio_iov = &io;
1598 uiop->uio_iovcnt = 1;
1599 uiop->uio_segflg = UIO_SYSSPACE;
1603 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
1604 * do this here so we do not have to do it in all the code that
1607 bp->b_flags &= ~B_INVAL;
1608 bp->b_ioflags &= ~BIO_ERROR;
1610 KASSERT(!(bp->b_flags & B_DONE), ("ncl_doio: bp %p already marked done", bp));
1611 iocmd = bp->b_iocmd;
1612 if (iocmd == BIO_READ) {
1613 io.iov_len = uiop->uio_resid = bp->b_bcount;
1614 io.iov_base = bp->b_data;
1615 uiop->uio_rw = UIO_READ;
1617 switch (vp->v_type) {
1619 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
1620 NFSINCRGLOBAL(nfsstatsv1.read_bios);
1621 error = ncl_readrpc(vp, uiop, cr);
1624 if (uiop->uio_resid) {
1626 * If we had a short read with no error, we must have
1627 * hit a file hole. We should zero-fill the remainder.
1628 * This can also occur if the server hits the file EOF.
1630 * Holes used to be able to occur due to pending
1631 * writes, but that is not possible any longer.
1633 int nread = bp->b_bcount - uiop->uio_resid;
1634 ssize_t left = uiop->uio_resid;
1637 bzero((char *)bp->b_data + nread, left);
1638 uiop->uio_resid = 0;
1641 /* ASSERT_VOP_LOCKED(vp, "ncl_doio"); */
1642 if (p && (vp->v_vflag & VV_TEXT)) {
1643 mtx_lock(&np->n_mtx);
1644 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &np->n_vattr.na_mtime)) {
1645 mtx_unlock(&np->n_mtx);
1647 killproc(p, "text file modification");
1650 mtx_unlock(&np->n_mtx);
1654 uiop->uio_offset = (off_t)0;
1655 NFSINCRGLOBAL(nfsstatsv1.readlink_bios);
1656 error = ncl_readlinkrpc(vp, uiop, cr);
1659 NFSINCRGLOBAL(nfsstatsv1.readdir_bios);
1660 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
1661 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) != 0) {
1662 error = ncl_readdirplusrpc(vp, uiop, cr, td);
1663 if (error == NFSERR_NOTSUPP)
1664 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
1666 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
1667 error = ncl_readdirrpc(vp, uiop, cr, td);
1669 * end-of-directory sets B_INVAL but does not generate an
1672 if (error == 0 && uiop->uio_resid == bp->b_bcount)
1673 bp->b_flags |= B_INVAL;
1676 printf("ncl_doio: type %x unexpected\n", vp->v_type);
1680 bp->b_ioflags |= BIO_ERROR;
1681 bp->b_error = error;
1685 * If we only need to commit, try to commit
1687 if (bp->b_flags & B_NEEDCOMMIT) {
1691 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
1692 retv = ncl_commit(vp, off, bp->b_dirtyend-bp->b_dirtyoff,
1695 bp->b_dirtyoff = bp->b_dirtyend = 0;
1696 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1701 if (retv == NFSERR_STALEWRITEVERF) {
1702 ncl_clearcommit(vp->v_mount);
1707 * Setup for actual write
1709 mtx_lock(&np->n_mtx);
1710 if ((off_t)bp->b_blkno * DEV_BSIZE + bp->b_dirtyend > np->n_size)
1711 bp->b_dirtyend = np->n_size - (off_t)bp->b_blkno * DEV_BSIZE;
1712 mtx_unlock(&np->n_mtx);
1714 if (bp->b_dirtyend > bp->b_dirtyoff) {
1715 io.iov_len = uiop->uio_resid = bp->b_dirtyend
1717 uiop->uio_offset = (off_t)bp->b_blkno * DEV_BSIZE
1719 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
1720 uiop->uio_rw = UIO_WRITE;
1721 NFSINCRGLOBAL(nfsstatsv1.write_bios);
1723 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC)
1724 iomode = NFSWRITE_UNSTABLE;
1726 iomode = NFSWRITE_FILESYNC;
1728 error = ncl_writerpc(vp, uiop, cr, &iomode, &must_commit,
1729 called_from_strategy);
1732 * When setting B_NEEDCOMMIT also set B_CLUSTEROK to try
1733 * to cluster the buffers needing commit. This will allow
1734 * the system to submit a single commit rpc for the whole
1735 * cluster. We can do this even if the buffer is not 100%
1736 * dirty (relative to the NFS blocksize), so we optimize the
1737 * append-to-file-case.
1739 * (when clearing B_NEEDCOMMIT, B_CLUSTEROK must also be
1740 * cleared because write clustering only works for commit
1741 * rpc's, not for the data portion of the write).
1744 if (!error && iomode == NFSWRITE_UNSTABLE) {
1745 bp->b_flags |= B_NEEDCOMMIT;
1746 if (bp->b_dirtyoff == 0
1747 && bp->b_dirtyend == bp->b_bcount)
1748 bp->b_flags |= B_CLUSTEROK;
1750 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1754 * For an interrupted write, the buffer is still valid
1755 * and the write hasn't been pushed to the server yet,
1756 * so we can't set BIO_ERROR and report the interruption
1757 * by setting B_EINTR. For the B_ASYNC case, B_EINTR
1758 * is not relevant, so the rpc attempt is essentially
1759 * a noop. For the case of a V3 write rpc not being
1760 * committed to stable storage, the block is still
1761 * dirty and requires either a commit rpc or another
1762 * write rpc with iomode == NFSV3WRITE_FILESYNC before
1763 * the block is reused. This is indicated by setting
1764 * the B_DELWRI and B_NEEDCOMMIT flags.
1766 * EIO is returned by ncl_writerpc() to indicate a recoverable
1767 * write error and is handled as above, except that
1768 * B_EINTR isn't set. One cause of this is a stale stateid
1769 * error for the RPC that indicates recovery is required,
1770 * when called with called_from_strategy != 0.
1772 * If the buffer is marked B_PAGING, it does not reside on
1773 * the vp's paging queues so we cannot call bdirty(). The
1774 * bp in this case is not an NFS cache block so we should
1777 * The logic below breaks up errors into recoverable and
1778 * unrecoverable. For the former, we clear B_INVAL|B_NOCACHE
1779 * and keep the buffer around for potential write retries.
1780 * For the latter (eg ESTALE), we toss the buffer away (B_INVAL)
1781 * and save the error in the nfsnode. This is less than ideal
1782 * but necessary. Keeping such buffers around could potentially
1783 * cause buffer exhaustion eventually (they can never be written
1784 * out, so will get constantly be re-dirtied). It also causes
1785 * all sorts of vfs panics. For non-recoverable write errors,
1786 * also invalidate the attrcache, so we'll be forced to go over
1787 * the wire for this object, returning an error to user on next
1788 * call (most of the time).
1790 if (error == EINTR || error == EIO || error == ETIMEDOUT
1791 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
1792 bp->b_flags &= ~(B_INVAL|B_NOCACHE);
1793 if ((bp->b_flags & B_PAGING) == 0) {
1795 bp->b_flags &= ~B_DONE;
1797 if ((error == EINTR || error == ETIMEDOUT) &&
1798 (bp->b_flags & B_ASYNC) == 0)
1799 bp->b_flags |= B_EINTR;
1802 bp->b_ioflags |= BIO_ERROR;
1803 bp->b_flags |= B_INVAL;
1804 bp->b_error = np->n_error = error;
1805 mtx_lock(&np->n_mtx);
1806 np->n_flag |= NWRITEERR;
1807 np->n_attrstamp = 0;
1808 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1809 mtx_unlock(&np->n_mtx);
1811 bp->b_dirtyoff = bp->b_dirtyend = 0;
1819 bp->b_resid = uiop->uio_resid;
1821 ncl_clearcommit(vp->v_mount);
1827 * Used to aid in handling ftruncate() operations on the NFS client side.
1828 * Truncation creates a number of special problems for NFS. We have to
1829 * throw away VM pages and buffer cache buffers that are beyond EOF, and
1830 * we have to properly handle VM pages or (potentially dirty) buffers
1831 * that straddle the truncation point.
1835 ncl_meta_setsize(struct vnode *vp, struct ucred *cred, struct thread *td, u_quad_t nsize)
1837 struct nfsnode *np = VTONFS(vp);
1839 int biosize = vp->v_bufobj.bo_bsize;
1842 mtx_lock(&np->n_mtx);
1845 mtx_unlock(&np->n_mtx);
1847 if (nsize < tsize) {
1853 * vtruncbuf() doesn't get the buffer overlapping the
1854 * truncation point. We may have a B_DELWRI and/or B_CACHE
1855 * buffer that now needs to be truncated.
1857 error = vtruncbuf(vp, cred, nsize, biosize);
1858 lbn = nsize / biosize;
1859 bufsize = nsize - (lbn * biosize);
1860 bp = nfs_getcacheblk(vp, lbn, bufsize, td);
1863 if (bp->b_dirtyoff > bp->b_bcount)
1864 bp->b_dirtyoff = bp->b_bcount;
1865 if (bp->b_dirtyend > bp->b_bcount)
1866 bp->b_dirtyend = bp->b_bcount;
1867 bp->b_flags |= B_RELBUF; /* don't leave garbage around */
1870 vnode_pager_setsize(vp, nsize);