2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * @(#)nfs_bio.c 8.9 (Berkeley) 3/30/95
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/mount.h>
44 #include <sys/rwlock.h>
45 #include <sys/vmmeter.h>
46 #include <sys/vnode.h>
49 #include <vm/vm_param.h>
50 #include <vm/vm_extern.h>
51 #include <vm/vm_page.h>
52 #include <vm/vm_object.h>
53 #include <vm/vm_pager.h>
54 #include <vm/vnode_pager.h>
56 #include <fs/nfs/nfsport.h>
57 #include <fs/nfsclient/nfsmount.h>
58 #include <fs/nfsclient/nfs.h>
59 #include <fs/nfsclient/nfsnode.h>
60 #include <fs/nfsclient/nfs_kdtrace.h>
62 extern int newnfs_directio_allow_mmap;
63 extern struct nfsstats newnfsstats;
64 extern struct mtx ncl_iod_mutex;
65 extern int ncl_numasync;
66 extern enum nfsiod_state ncl_iodwant[NFS_MAXASYNCDAEMON];
67 extern struct nfsmount *ncl_iodmount[NFS_MAXASYNCDAEMON];
68 extern int newnfs_directio_enable;
69 extern int nfs_keep_dirty_on_error;
71 int ncl_pbuf_freecnt = -1; /* start out unlimited */
73 static struct buf *nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size,
75 static int nfs_directio_write(struct vnode *vp, struct uio *uiop,
76 struct ucred *cred, int ioflag);
79 * Vnode op for VM getpages.
82 ncl_getpages(struct vop_getpages_args *ap)
84 int i, error, nextoff, size, toff, count, npages;
99 td = curthread; /* XXX */
100 cred = curthread->td_ucred; /* XXX */
101 nmp = VFSTONFS(vp->v_mount);
105 if ((object = vp->v_object) == NULL) {
106 ncl_printf("nfs_getpages: called with non-merged cache vnode??\n");
107 return (VM_PAGER_ERROR);
110 if (newnfs_directio_enable && !newnfs_directio_allow_mmap) {
111 mtx_lock(&np->n_mtx);
112 if ((np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
113 mtx_unlock(&np->n_mtx);
114 ncl_printf("nfs_getpages: called on non-cacheable vnode??\n");
115 return (VM_PAGER_ERROR);
117 mtx_unlock(&np->n_mtx);
120 mtx_lock(&nmp->nm_mtx);
121 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
122 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
123 mtx_unlock(&nmp->nm_mtx);
124 /* We'll never get here for v4, because we always have fsinfo */
125 (void)ncl_fsinfo(nmp, vp, cred, td);
127 mtx_unlock(&nmp->nm_mtx);
129 npages = btoc(count);
132 * Since the caller has busied the requested page, that page's valid
133 * field will not be changed by other threads.
135 vm_page_assert_xbusied(pages[ap->a_reqpage]);
138 * If the requested page is partially valid, just return it and
139 * allow the pager to zero-out the blanks. Partially valid pages
140 * can only occur at the file EOF.
142 if (pages[ap->a_reqpage]->valid != 0) {
143 vm_pager_free_nonreq(object, pages, ap->a_reqpage, npages);
144 return (VM_PAGER_OK);
148 * We use only the kva address for the buffer, but this is extremely
149 * convienient and fast.
151 bp = getpbuf(&ncl_pbuf_freecnt);
153 kva = (vm_offset_t) bp->b_data;
154 pmap_qenter(kva, pages, npages);
155 PCPU_INC(cnt.v_vnodein);
156 PCPU_ADD(cnt.v_vnodepgsin, npages);
158 iov.iov_base = (caddr_t) kva;
162 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
163 uio.uio_resid = count;
164 uio.uio_segflg = UIO_SYSSPACE;
165 uio.uio_rw = UIO_READ;
168 error = ncl_readrpc(vp, &uio, cred);
169 pmap_qremove(kva, npages);
171 relpbuf(bp, &ncl_pbuf_freecnt);
173 if (error && (uio.uio_resid == count)) {
174 ncl_printf("nfs_getpages: error %d\n", error);
175 vm_pager_free_nonreq(object, pages, ap->a_reqpage, npages);
176 return (VM_PAGER_ERROR);
180 * Calculate the number of bytes read and validate only that number
181 * of bytes. Note that due to pending writes, size may be 0. This
182 * does not mean that the remaining data is invalid!
185 size = count - uio.uio_resid;
186 VM_OBJECT_WLOCK(object);
187 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
189 nextoff = toff + PAGE_SIZE;
192 if (nextoff <= size) {
194 * Read operation filled an entire page
196 m->valid = VM_PAGE_BITS_ALL;
197 KASSERT(m->dirty == 0,
198 ("nfs_getpages: page %p is dirty", m));
199 } else if (size > toff) {
201 * Read operation filled a partial page.
204 vm_page_set_valid_range(m, 0, size - toff);
205 KASSERT(m->dirty == 0,
206 ("nfs_getpages: page %p is dirty", m));
209 * Read operation was short. If no error
210 * occured we may have hit a zero-fill
211 * section. We leave valid set to 0, and page
212 * is freed by vm_page_readahead_finish() if
213 * its index is not equal to requested, or
214 * page is zeroed and set valid by
215 * vm_pager_get_pages() for requested page.
219 if (i != ap->a_reqpage)
220 vm_page_readahead_finish(m);
222 VM_OBJECT_WUNLOCK(object);
227 * Vnode op for VM putpages.
230 ncl_putpages(struct vop_putpages_args *ap)
236 int iomode, must_commit, i, error, npages, count;
242 struct nfsmount *nmp;
248 td = curthread; /* XXX */
249 /* Set the cred to n_writecred for the write rpcs. */
250 if (np->n_writecred != NULL)
251 cred = crhold(np->n_writecred);
253 cred = crhold(curthread->td_ucred); /* XXX */
254 nmp = VFSTONFS(vp->v_mount);
257 rtvals = ap->a_rtvals;
258 npages = btoc(count);
259 offset = IDX_TO_OFF(pages[0]->pindex);
261 mtx_lock(&nmp->nm_mtx);
262 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
263 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
264 mtx_unlock(&nmp->nm_mtx);
265 (void)ncl_fsinfo(nmp, vp, cred, td);
267 mtx_unlock(&nmp->nm_mtx);
269 mtx_lock(&np->n_mtx);
270 if (newnfs_directio_enable && !newnfs_directio_allow_mmap &&
271 (np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
272 mtx_unlock(&np->n_mtx);
273 ncl_printf("ncl_putpages: called on noncache-able vnode??\n");
274 mtx_lock(&np->n_mtx);
277 for (i = 0; i < npages; i++)
278 rtvals[i] = VM_PAGER_ERROR;
281 * When putting pages, do not extend file past EOF.
283 if (offset + count > np->n_size) {
284 count = np->n_size - offset;
288 mtx_unlock(&np->n_mtx);
291 * We use only the kva address for the buffer, but this is extremely
292 * convienient and fast.
294 bp = getpbuf(&ncl_pbuf_freecnt);
296 kva = (vm_offset_t) bp->b_data;
297 pmap_qenter(kva, pages, npages);
298 PCPU_INC(cnt.v_vnodeout);
299 PCPU_ADD(cnt.v_vnodepgsout, count);
301 iov.iov_base = (caddr_t) kva;
305 uio.uio_offset = offset;
306 uio.uio_resid = count;
307 uio.uio_segflg = UIO_SYSSPACE;
308 uio.uio_rw = UIO_WRITE;
311 if ((ap->a_sync & VM_PAGER_PUT_SYNC) == 0)
312 iomode = NFSWRITE_UNSTABLE;
314 iomode = NFSWRITE_FILESYNC;
316 error = ncl_writerpc(vp, &uio, cred, &iomode, &must_commit, 0);
319 pmap_qremove(kva, npages);
320 relpbuf(bp, &ncl_pbuf_freecnt);
322 if (error == 0 || !nfs_keep_dirty_on_error) {
323 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid);
325 ncl_clearcommit(vp->v_mount);
331 * For nfs, cache consistency can only be maintained approximately.
332 * Although RFC1094 does not specify the criteria, the following is
333 * believed to be compatible with the reference port.
335 * If the file's modify time on the server has changed since the
336 * last read rpc or you have written to the file,
337 * you may have lost data cache consistency with the
338 * server, so flush all of the file's data out of the cache.
339 * Then force a getattr rpc to ensure that you have up to date
341 * NB: This implies that cache data can be read when up to
342 * NFS_ATTRTIMEO seconds out of date. If you find that you need current
343 * attributes this could be forced by setting n_attrstamp to 0 before
344 * the VOP_GETATTR() call.
347 nfs_bioread_check_cons(struct vnode *vp, struct thread *td, struct ucred *cred)
351 struct nfsnode *np = VTONFS(vp);
355 * Grab the exclusive lock before checking whether the cache is
357 * XXX - We can make this cheaper later (by acquiring cheaper locks).
358 * But for now, this suffices.
360 old_lock = ncl_upgrade_vnlock(vp);
361 if (vp->v_iflag & VI_DOOMED) {
362 ncl_downgrade_vnlock(vp, old_lock);
366 mtx_lock(&np->n_mtx);
367 if (np->n_flag & NMODIFIED) {
368 mtx_unlock(&np->n_mtx);
369 if (vp->v_type != VREG) {
370 if (vp->v_type != VDIR)
371 panic("nfs: bioread, not dir");
373 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
378 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
379 error = VOP_GETATTR(vp, &vattr, cred);
382 mtx_lock(&np->n_mtx);
383 np->n_mtime = vattr.va_mtime;
384 mtx_unlock(&np->n_mtx);
386 mtx_unlock(&np->n_mtx);
387 error = VOP_GETATTR(vp, &vattr, cred);
390 mtx_lock(&np->n_mtx);
391 if ((np->n_flag & NSIZECHANGED)
392 || (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime))) {
393 mtx_unlock(&np->n_mtx);
394 if (vp->v_type == VDIR)
396 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
399 mtx_lock(&np->n_mtx);
400 np->n_mtime = vattr.va_mtime;
401 np->n_flag &= ~NSIZECHANGED;
403 mtx_unlock(&np->n_mtx);
406 ncl_downgrade_vnlock(vp, old_lock);
411 * Vnode op for read using bio
414 ncl_bioread(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred)
416 struct nfsnode *np = VTONFS(vp);
418 struct buf *bp, *rabp;
420 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
424 int nra, error = 0, n = 0, on = 0;
427 KASSERT(uio->uio_rw == UIO_READ, ("ncl_read mode"));
428 if (uio->uio_resid == 0)
430 if (uio->uio_offset < 0) /* XXX VDIR cookies can be negative */
434 mtx_lock(&nmp->nm_mtx);
435 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
436 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
437 mtx_unlock(&nmp->nm_mtx);
438 (void)ncl_fsinfo(nmp, vp, cred, td);
439 mtx_lock(&nmp->nm_mtx);
441 if (nmp->nm_rsize == 0 || nmp->nm_readdirsize == 0)
442 (void) newnfs_iosize(nmp);
444 tmp_off = uio->uio_offset + uio->uio_resid;
445 if (vp->v_type != VDIR &&
446 (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)) {
447 mtx_unlock(&nmp->nm_mtx);
450 mtx_unlock(&nmp->nm_mtx);
452 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && (vp->v_type == VREG))
453 /* No caching/ no readaheads. Just read data into the user buffer */
454 return ncl_readrpc(vp, uio, cred);
456 biosize = vp->v_bufobj.bo_bsize;
457 seqcount = (int)((off_t)(ioflag >> IO_SEQSHIFT) * biosize / BKVASIZE);
459 error = nfs_bioread_check_cons(vp, td, cred);
466 mtx_lock(&np->n_mtx);
468 mtx_unlock(&np->n_mtx);
470 switch (vp->v_type) {
472 NFSINCRGLOBAL(newnfsstats.biocache_reads);
473 lbn = uio->uio_offset / biosize;
474 on = uio->uio_offset - (lbn * biosize);
477 * Start the read ahead(s), as required.
479 if (nmp->nm_readahead > 0) {
480 for (nra = 0; nra < nmp->nm_readahead && nra < seqcount &&
481 (off_t)(lbn + 1 + nra) * biosize < nsize; nra++) {
482 rabn = lbn + 1 + nra;
483 if (incore(&vp->v_bufobj, rabn) == NULL) {
484 rabp = nfs_getcacheblk(vp, rabn, biosize, td);
486 error = newnfs_sigintr(nmp, td);
487 return (error ? error : EINTR);
489 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
490 rabp->b_flags |= B_ASYNC;
491 rabp->b_iocmd = BIO_READ;
492 vfs_busy_pages(rabp, 0);
493 if (ncl_asyncio(nmp, rabp, cred, td)) {
494 rabp->b_flags |= B_INVAL;
495 rabp->b_ioflags |= BIO_ERROR;
496 vfs_unbusy_pages(rabp);
507 /* Note that bcount is *not* DEV_BSIZE aligned. */
509 if ((off_t)lbn * biosize >= nsize) {
511 } else if ((off_t)(lbn + 1) * biosize > nsize) {
512 bcount = nsize - (off_t)lbn * biosize;
514 bp = nfs_getcacheblk(vp, lbn, bcount, td);
517 error = newnfs_sigintr(nmp, td);
518 return (error ? error : EINTR);
522 * If B_CACHE is not set, we must issue the read. If this
523 * fails, we return an error.
526 if ((bp->b_flags & B_CACHE) == 0) {
527 bp->b_iocmd = BIO_READ;
528 vfs_busy_pages(bp, 0);
529 error = ncl_doio(vp, bp, cred, td, 0);
537 * on is the offset into the current bp. Figure out how many
538 * bytes we can copy out of the bp. Note that bcount is
539 * NOT DEV_BSIZE aligned.
541 * Then figure out how many bytes we can copy into the uio.
546 n = MIN((unsigned)(bcount - on), uio->uio_resid);
549 NFSINCRGLOBAL(newnfsstats.biocache_readlinks);
550 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, td);
552 error = newnfs_sigintr(nmp, td);
553 return (error ? error : EINTR);
555 if ((bp->b_flags & B_CACHE) == 0) {
556 bp->b_iocmd = BIO_READ;
557 vfs_busy_pages(bp, 0);
558 error = ncl_doio(vp, bp, cred, td, 0);
560 bp->b_ioflags |= BIO_ERROR;
565 n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
569 NFSINCRGLOBAL(newnfsstats.biocache_readdirs);
570 if (np->n_direofoffset
571 && uio->uio_offset >= np->n_direofoffset) {
574 lbn = (uoff_t)uio->uio_offset / NFS_DIRBLKSIZ;
575 on = uio->uio_offset & (NFS_DIRBLKSIZ - 1);
576 bp = nfs_getcacheblk(vp, lbn, NFS_DIRBLKSIZ, td);
578 error = newnfs_sigintr(nmp, td);
579 return (error ? error : EINTR);
581 if ((bp->b_flags & B_CACHE) == 0) {
582 bp->b_iocmd = BIO_READ;
583 vfs_busy_pages(bp, 0);
584 error = ncl_doio(vp, bp, cred, td, 0);
588 while (error == NFSERR_BAD_COOKIE) {
590 error = ncl_vinvalbuf(vp, 0, td, 1);
592 * Yuck! The directory has been modified on the
593 * server. The only way to get the block is by
594 * reading from the beginning to get all the
597 * Leave the last bp intact unless there is an error.
598 * Loop back up to the while if the error is another
599 * NFSERR_BAD_COOKIE (double yuch!).
601 for (i = 0; i <= lbn && !error; i++) {
602 if (np->n_direofoffset
603 && (i * NFS_DIRBLKSIZ) >= np->n_direofoffset)
605 bp = nfs_getcacheblk(vp, i, NFS_DIRBLKSIZ, td);
607 error = newnfs_sigintr(nmp, td);
608 return (error ? error : EINTR);
610 if ((bp->b_flags & B_CACHE) == 0) {
611 bp->b_iocmd = BIO_READ;
612 vfs_busy_pages(bp, 0);
613 error = ncl_doio(vp, bp, cred, td, 0);
615 * no error + B_INVAL == directory EOF,
618 if (error == 0 && (bp->b_flags & B_INVAL))
622 * An error will throw away the block and the
623 * for loop will break out. If no error and this
624 * is not the block we want, we throw away the
625 * block and go for the next one via the for loop.
627 if (error || i < lbn)
632 * The above while is repeated if we hit another cookie
633 * error. If we hit an error and it wasn't a cookie error,
641 * If not eof and read aheads are enabled, start one.
642 * (You need the current block first, so that you have the
643 * directory offset cookie of the next block.)
645 if (nmp->nm_readahead > 0 &&
646 (bp->b_flags & B_INVAL) == 0 &&
647 (np->n_direofoffset == 0 ||
648 (lbn + 1) * NFS_DIRBLKSIZ < np->n_direofoffset) &&
649 incore(&vp->v_bufobj, lbn + 1) == NULL) {
650 rabp = nfs_getcacheblk(vp, lbn + 1, NFS_DIRBLKSIZ, td);
652 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
653 rabp->b_flags |= B_ASYNC;
654 rabp->b_iocmd = BIO_READ;
655 vfs_busy_pages(rabp, 0);
656 if (ncl_asyncio(nmp, rabp, cred, td)) {
657 rabp->b_flags |= B_INVAL;
658 rabp->b_ioflags |= BIO_ERROR;
659 vfs_unbusy_pages(rabp);
668 * Unlike VREG files, whos buffer size ( bp->b_bcount ) is
669 * chopped for the EOF condition, we cannot tell how large
670 * NFS directories are going to be until we hit EOF. So
671 * an NFS directory buffer is *not* chopped to its EOF. Now,
672 * it just so happens that b_resid will effectively chop it
673 * to EOF. *BUT* this information is lost if the buffer goes
674 * away and is reconstituted into a B_CACHE state ( due to
675 * being VMIO ) later. So we keep track of the directory eof
676 * in np->n_direofoffset and chop it off as an extra step
679 n = lmin(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid - on);
680 if (np->n_direofoffset && n > np->n_direofoffset - uio->uio_offset)
681 n = np->n_direofoffset - uio->uio_offset;
684 ncl_printf(" ncl_bioread: type %x unexpected\n", vp->v_type);
690 error = vn_io_fault_uiomove(bp->b_data + on, (int)n, uio);
692 if (vp->v_type == VLNK)
696 } while (error == 0 && uio->uio_resid > 0 && n > 0);
701 * The NFS write path cannot handle iovecs with len > 1. So we need to
702 * break up iovecs accordingly (restricting them to wsize).
703 * For the SYNC case, we can do this with 1 copy (user buffer -> mbuf).
704 * For the ASYNC case, 2 copies are needed. The first a copy from the
705 * user buffer to a staging buffer and then a second copy from the staging
706 * buffer to mbufs. This can be optimized by copying from the user buffer
707 * directly into mbufs and passing the chain down, but that requires a
708 * fair amount of re-working of the relevant codepaths (and can be done
712 nfs_directio_write(vp, uiop, cred, ioflag)
719 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
720 struct thread *td = uiop->uio_td;
724 mtx_lock(&nmp->nm_mtx);
725 wsize = nmp->nm_wsize;
726 mtx_unlock(&nmp->nm_mtx);
727 if (ioflag & IO_SYNC) {
728 int iomode, must_commit;
732 while (uiop->uio_resid > 0) {
733 size = MIN(uiop->uio_resid, wsize);
734 size = MIN(uiop->uio_iov->iov_len, size);
735 iov.iov_base = uiop->uio_iov->iov_base;
739 uio.uio_offset = uiop->uio_offset;
740 uio.uio_resid = size;
741 uio.uio_segflg = UIO_USERSPACE;
742 uio.uio_rw = UIO_WRITE;
744 iomode = NFSWRITE_FILESYNC;
745 error = ncl_writerpc(vp, &uio, cred, &iomode,
747 KASSERT((must_commit == 0),
748 ("ncl_directio_write: Did not commit write"));
751 uiop->uio_offset += size;
752 uiop->uio_resid -= size;
753 if (uiop->uio_iov->iov_len <= size) {
757 uiop->uio_iov->iov_base =
758 (char *)uiop->uio_iov->iov_base + size;
759 uiop->uio_iov->iov_len -= size;
768 * Break up the write into blocksize chunks and hand these
769 * over to nfsiod's for write back.
770 * Unfortunately, this incurs a copy of the data. Since
771 * the user could modify the buffer before the write is
774 * The obvious optimization here is that one of the 2 copies
775 * in the async write path can be eliminated by copying the
776 * data here directly into mbufs and passing the mbuf chain
777 * down. But that will require a fair amount of re-working
778 * of the code and can be done if there's enough interest
779 * in NFS directio access.
781 while (uiop->uio_resid > 0) {
782 size = MIN(uiop->uio_resid, wsize);
783 size = MIN(uiop->uio_iov->iov_len, size);
784 bp = getpbuf(&ncl_pbuf_freecnt);
785 t_uio = malloc(sizeof(struct uio), M_NFSDIRECTIO, M_WAITOK);
786 t_iov = malloc(sizeof(struct iovec), M_NFSDIRECTIO, M_WAITOK);
787 t_iov->iov_base = malloc(size, M_NFSDIRECTIO, M_WAITOK);
788 t_iov->iov_len = size;
789 t_uio->uio_iov = t_iov;
790 t_uio->uio_iovcnt = 1;
791 t_uio->uio_offset = uiop->uio_offset;
792 t_uio->uio_resid = size;
793 t_uio->uio_segflg = UIO_SYSSPACE;
794 t_uio->uio_rw = UIO_WRITE;
796 KASSERT(uiop->uio_segflg == UIO_USERSPACE ||
797 uiop->uio_segflg == UIO_SYSSPACE,
798 ("nfs_directio_write: Bad uio_segflg"));
799 if (uiop->uio_segflg == UIO_USERSPACE) {
800 error = copyin(uiop->uio_iov->iov_base,
801 t_iov->iov_base, size);
806 * UIO_SYSSPACE may never happen, but handle
807 * it just in case it does.
809 bcopy(uiop->uio_iov->iov_base, t_iov->iov_base,
811 bp->b_flags |= B_DIRECT;
812 bp->b_iocmd = BIO_WRITE;
813 if (cred != NOCRED) {
817 bp->b_wcred = NOCRED;
818 bp->b_caller1 = (void *)t_uio;
820 error = ncl_asyncio(nmp, bp, NOCRED, td);
823 free(t_iov->iov_base, M_NFSDIRECTIO);
824 free(t_iov, M_NFSDIRECTIO);
825 free(t_uio, M_NFSDIRECTIO);
827 relpbuf(bp, &ncl_pbuf_freecnt);
832 uiop->uio_offset += size;
833 uiop->uio_resid -= size;
834 if (uiop->uio_iov->iov_len <= size) {
838 uiop->uio_iov->iov_base =
839 (char *)uiop->uio_iov->iov_base + size;
840 uiop->uio_iov->iov_len -= size;
848 * Vnode op for write using bio
851 ncl_write(struct vop_write_args *ap)
854 struct uio *uio = ap->a_uio;
855 struct thread *td = uio->uio_td;
856 struct vnode *vp = ap->a_vp;
857 struct nfsnode *np = VTONFS(vp);
858 struct ucred *cred = ap->a_cred;
859 int ioflag = ap->a_ioflag;
862 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
864 int bcount, noncontig_write, obcount;
865 int bp_cached, n, on, error = 0, error1;
866 size_t orig_resid, local_resid;
867 off_t orig_size, tmp_off;
869 KASSERT(uio->uio_rw == UIO_WRITE, ("ncl_write mode"));
870 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
872 if (vp->v_type != VREG)
874 mtx_lock(&np->n_mtx);
875 if (np->n_flag & NWRITEERR) {
876 np->n_flag &= ~NWRITEERR;
877 mtx_unlock(&np->n_mtx);
878 return (np->n_error);
880 mtx_unlock(&np->n_mtx);
881 mtx_lock(&nmp->nm_mtx);
882 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
883 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
884 mtx_unlock(&nmp->nm_mtx);
885 (void)ncl_fsinfo(nmp, vp, cred, td);
886 mtx_lock(&nmp->nm_mtx);
888 if (nmp->nm_wsize == 0)
889 (void) newnfs_iosize(nmp);
890 mtx_unlock(&nmp->nm_mtx);
893 * Synchronously flush pending buffers if we are in synchronous
894 * mode or if we are appending.
896 if (ioflag & (IO_APPEND | IO_SYNC)) {
897 mtx_lock(&np->n_mtx);
898 if (np->n_flag & NMODIFIED) {
899 mtx_unlock(&np->n_mtx);
900 #ifdef notyet /* Needs matching nonblock semantics elsewhere, too. */
902 * Require non-blocking, synchronous writes to
903 * dirty files to inform the program it needs
904 * to fsync(2) explicitly.
906 if (ioflag & IO_NDELAY)
911 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
912 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
916 mtx_unlock(&np->n_mtx);
919 orig_resid = uio->uio_resid;
920 mtx_lock(&np->n_mtx);
921 orig_size = np->n_size;
922 mtx_unlock(&np->n_mtx);
925 * If IO_APPEND then load uio_offset. We restart here if we cannot
926 * get the append lock.
928 if (ioflag & IO_APPEND) {
930 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
931 error = VOP_GETATTR(vp, &vattr, cred);
934 mtx_lock(&np->n_mtx);
935 uio->uio_offset = np->n_size;
936 mtx_unlock(&np->n_mtx);
939 if (uio->uio_offset < 0)
941 tmp_off = uio->uio_offset + uio->uio_resid;
942 if (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)
944 if (uio->uio_resid == 0)
947 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && vp->v_type == VREG)
948 return nfs_directio_write(vp, uio, cred, ioflag);
951 * Maybe this should be above the vnode op call, but so long as
952 * file servers have no limits, i don't think it matters
954 if (vn_rlimit_fsize(vp, uio, td))
957 biosize = vp->v_bufobj.bo_bsize;
959 * Find all of this file's B_NEEDCOMMIT buffers. If our writes
960 * would exceed the local maximum per-file write commit size when
961 * combined with those, we must decide whether to flush,
962 * go synchronous, or return error. We don't bother checking
963 * IO_UNIT -- we just make all writes atomic anyway, as there's
964 * no point optimizing for something that really won't ever happen.
966 if (!(ioflag & IO_SYNC)) {
969 mtx_lock(&np->n_mtx);
971 mtx_unlock(&np->n_mtx);
973 if (nmp->nm_wcommitsize < uio->uio_resid) {
975 * If this request could not possibly be completed
976 * without exceeding the maximum outstanding write
977 * commit size, see if we can convert it into a
978 * synchronous write operation.
980 if (ioflag & IO_NDELAY)
983 if (nflag & NMODIFIED)
985 } else if (nflag & NMODIFIED) {
987 BO_LOCK(&vp->v_bufobj);
988 if (vp->v_bufobj.bo_dirty.bv_cnt != 0) {
989 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd,
991 if (bp->b_flags & B_NEEDCOMMIT)
992 wouldcommit += bp->b_bcount;
995 BO_UNLOCK(&vp->v_bufobj);
997 * Since we're not operating synchronously and
998 * bypassing the buffer cache, we are in a commit
999 * and holding all of these buffers whether
1000 * transmitted or not. If not limited, this
1001 * will lead to the buffer cache deadlocking,
1002 * as no one else can flush our uncommitted buffers.
1004 wouldcommit += uio->uio_resid;
1006 * If we would initially exceed the maximum
1007 * outstanding write commit size, flush and restart.
1009 if (wouldcommit > nmp->nm_wcommitsize)
1013 goto flush_and_restart;
1017 NFSINCRGLOBAL(newnfsstats.biocache_writes);
1018 lbn = uio->uio_offset / biosize;
1019 on = uio->uio_offset - (lbn * biosize);
1020 n = MIN((unsigned)(biosize - on), uio->uio_resid);
1023 * Handle direct append and file extension cases, calculate
1024 * unaligned buffer size.
1026 mtx_lock(&np->n_mtx);
1027 if ((np->n_flag & NHASBEENLOCKED) == 0 &&
1028 (nmp->nm_flag & NFSMNT_NONCONTIGWR) != 0)
1029 noncontig_write = 1;
1031 noncontig_write = 0;
1032 if ((uio->uio_offset == np->n_size ||
1033 (noncontig_write != 0 &&
1034 lbn == (np->n_size / biosize) &&
1035 uio->uio_offset + n > np->n_size)) && n) {
1036 mtx_unlock(&np->n_mtx);
1038 * Get the buffer (in its pre-append state to maintain
1039 * B_CACHE if it was previously set). Resize the
1040 * nfsnode after we have locked the buffer to prevent
1041 * readers from reading garbage.
1043 obcount = np->n_size - (lbn * biosize);
1044 bp = nfs_getcacheblk(vp, lbn, obcount, td);
1049 mtx_lock(&np->n_mtx);
1050 np->n_size = uio->uio_offset + n;
1051 np->n_flag |= NMODIFIED;
1052 vnode_pager_setsize(vp, np->n_size);
1053 mtx_unlock(&np->n_mtx);
1055 save = bp->b_flags & B_CACHE;
1057 allocbuf(bp, bcount);
1058 bp->b_flags |= save;
1059 if (noncontig_write != 0 && on > obcount)
1060 vfs_bio_bzero_buf(bp, obcount, on -
1065 * Obtain the locked cache block first, and then
1066 * adjust the file's size as appropriate.
1069 if ((off_t)lbn * biosize + bcount < np->n_size) {
1070 if ((off_t)(lbn + 1) * biosize < np->n_size)
1073 bcount = np->n_size - (off_t)lbn * biosize;
1075 mtx_unlock(&np->n_mtx);
1076 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1077 mtx_lock(&np->n_mtx);
1078 if (uio->uio_offset + n > np->n_size) {
1079 np->n_size = uio->uio_offset + n;
1080 np->n_flag |= NMODIFIED;
1081 vnode_pager_setsize(vp, np->n_size);
1083 mtx_unlock(&np->n_mtx);
1087 error = newnfs_sigintr(nmp, td);
1094 * Issue a READ if B_CACHE is not set. In special-append
1095 * mode, B_CACHE is based on the buffer prior to the write
1096 * op and is typically set, avoiding the read. If a read
1097 * is required in special append mode, the server will
1098 * probably send us a short-read since we extended the file
1099 * on our end, resulting in b_resid == 0 and, thusly,
1100 * B_CACHE getting set.
1102 * We can also avoid issuing the read if the write covers
1103 * the entire buffer. We have to make sure the buffer state
1104 * is reasonable in this case since we will not be initiating
1105 * I/O. See the comments in kern/vfs_bio.c's getblk() for
1108 * B_CACHE may also be set due to the buffer being cached
1113 if (on == 0 && n == bcount) {
1114 if ((bp->b_flags & B_CACHE) == 0)
1116 bp->b_flags |= B_CACHE;
1117 bp->b_flags &= ~B_INVAL;
1118 bp->b_ioflags &= ~BIO_ERROR;
1121 if ((bp->b_flags & B_CACHE) == 0) {
1122 bp->b_iocmd = BIO_READ;
1123 vfs_busy_pages(bp, 0);
1124 error = ncl_doio(vp, bp, cred, td, 0);
1130 if (bp->b_wcred == NOCRED)
1131 bp->b_wcred = crhold(cred);
1132 mtx_lock(&np->n_mtx);
1133 np->n_flag |= NMODIFIED;
1134 mtx_unlock(&np->n_mtx);
1137 * If dirtyend exceeds file size, chop it down. This should
1138 * not normally occur but there is an append race where it
1139 * might occur XXX, so we log it.
1141 * If the chopping creates a reverse-indexed or degenerate
1142 * situation with dirtyoff/end, we 0 both of them.
1145 if (bp->b_dirtyend > bcount) {
1146 ncl_printf("NFS append race @%lx:%d\n",
1147 (long)bp->b_blkno * DEV_BSIZE,
1148 bp->b_dirtyend - bcount);
1149 bp->b_dirtyend = bcount;
1152 if (bp->b_dirtyoff >= bp->b_dirtyend)
1153 bp->b_dirtyoff = bp->b_dirtyend = 0;
1156 * If the new write will leave a contiguous dirty
1157 * area, just update the b_dirtyoff and b_dirtyend,
1158 * otherwise force a write rpc of the old dirty area.
1160 * If there has been a file lock applied to this file
1161 * or vfs.nfs.old_noncontig_writing is set, do the following:
1162 * While it is possible to merge discontiguous writes due to
1163 * our having a B_CACHE buffer ( and thus valid read data
1164 * for the hole), we don't because it could lead to
1165 * significant cache coherency problems with multiple clients,
1166 * especially if locking is implemented later on.
1168 * If vfs.nfs.old_noncontig_writing is not set and there has
1169 * not been file locking done on this file:
1170 * Relax coherency a bit for the sake of performance and
1171 * expand the current dirty region to contain the new
1172 * write even if it means we mark some non-dirty data as
1176 if (noncontig_write == 0 && bp->b_dirtyend > 0 &&
1177 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
1178 if (bwrite(bp) == EINTR) {
1185 local_resid = uio->uio_resid;
1186 error = vn_io_fault_uiomove((char *)bp->b_data + on, n, uio);
1188 if (error != 0 && !bp_cached) {
1190 * This block has no other content then what
1191 * possibly was written by the faulty uiomove.
1192 * Release it, forgetting the data pages, to
1193 * prevent the leak of uninitialized data to
1196 bp->b_ioflags |= BIO_ERROR;
1198 uio->uio_offset -= local_resid - uio->uio_resid;
1199 uio->uio_resid = local_resid;
1204 * Since this block is being modified, it must be written
1205 * again and not just committed. Since write clustering does
1206 * not work for the stage 1 data write, only the stage 2
1207 * commit rpc, we have to clear B_CLUSTEROK as well.
1209 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1212 * Get the partial update on the progress made from
1213 * uiomove, if an error occured.
1216 n = local_resid - uio->uio_resid;
1219 * Only update dirtyoff/dirtyend if not a degenerate
1223 if (bp->b_dirtyend > 0) {
1224 bp->b_dirtyoff = min(on, bp->b_dirtyoff);
1225 bp->b_dirtyend = max((on + n), bp->b_dirtyend);
1227 bp->b_dirtyoff = on;
1228 bp->b_dirtyend = on + n;
1230 vfs_bio_set_valid(bp, on, n);
1234 * If IO_SYNC do bwrite().
1236 * IO_INVAL appears to be unused. The idea appears to be
1237 * to turn off caching in this case. Very odd. XXX
1239 if ((ioflag & IO_SYNC)) {
1240 if (ioflag & IO_INVAL)
1241 bp->b_flags |= B_NOCACHE;
1242 error1 = bwrite(bp);
1248 } else if ((n + on) == biosize) {
1249 bp->b_flags |= B_ASYNC;
1250 (void) ncl_writebp(bp, 0, NULL);
1257 } while (uio->uio_resid > 0 && n > 0);
1260 if (ioflag & IO_UNIT) {
1262 vattr.va_size = orig_size;
1263 /* IO_SYNC is handled implicitely */
1264 (void)VOP_SETATTR(vp, &vattr, cred);
1265 uio->uio_offset -= orig_resid - uio->uio_resid;
1266 uio->uio_resid = orig_resid;
1274 * Get an nfs cache block.
1276 * Allocate a new one if the block isn't currently in the cache
1277 * and return the block marked busy. If the calling process is
1278 * interrupted by a signal for an interruptible mount point, return
1281 * The caller must carefully deal with the possible B_INVAL state of
1282 * the buffer. ncl_doio() clears B_INVAL (and ncl_asyncio() clears it
1283 * indirectly), so synchronous reads can be issued without worrying about
1284 * the B_INVAL state. We have to be a little more careful when dealing
1285 * with writes (see comments in nfs_write()) when extending a file past
1289 nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct thread *td)
1293 struct nfsmount *nmp;
1298 if (nmp->nm_flag & NFSMNT_INT) {
1301 newnfs_set_sigmask(td, &oldset);
1302 bp = getblk(vp, bn, size, PCATCH, 0, 0);
1303 newnfs_restore_sigmask(td, &oldset);
1304 while (bp == NULL) {
1305 if (newnfs_sigintr(nmp, td))
1307 bp = getblk(vp, bn, size, 0, 2 * hz, 0);
1310 bp = getblk(vp, bn, size, 0, 0, 0);
1313 if (vp->v_type == VREG)
1314 bp->b_blkno = bn * (vp->v_bufobj.bo_bsize / DEV_BSIZE);
1319 * Flush and invalidate all dirty buffers. If another process is already
1320 * doing the flush, just wait for completion.
1323 ncl_vinvalbuf(struct vnode *vp, int flags, struct thread *td, int intrflg)
1325 struct nfsnode *np = VTONFS(vp);
1326 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1327 int error = 0, slpflag, slptimeo;
1330 ASSERT_VOP_LOCKED(vp, "ncl_vinvalbuf");
1332 if ((nmp->nm_flag & NFSMNT_INT) == 0)
1334 if ((nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF))
1344 old_lock = ncl_upgrade_vnlock(vp);
1345 if (vp->v_iflag & VI_DOOMED) {
1347 * Since vgonel() uses the generic vinvalbuf() to flush
1348 * dirty buffers and it does not call this function, it
1349 * is safe to just return OK when VI_DOOMED is set.
1351 ncl_downgrade_vnlock(vp, old_lock);
1356 * Now, flush as required.
1358 if ((flags & V_SAVE) && (vp->v_bufobj.bo_object != NULL)) {
1359 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object);
1360 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
1361 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object);
1363 * If the page clean was interrupted, fail the invalidation.
1364 * Not doing so, we run the risk of losing dirty pages in the
1365 * vinvalbuf() call below.
1367 if (intrflg && (error = newnfs_sigintr(nmp, td)))
1371 error = vinvalbuf(vp, flags, slpflag, 0);
1373 if (intrflg && (error = newnfs_sigintr(nmp, td)))
1375 error = vinvalbuf(vp, flags, 0, slptimeo);
1377 if (NFSHASPNFS(nmp)) {
1378 nfscl_layoutcommit(vp, td);
1380 * Invalidate the attribute cache, since writes to a DS
1381 * won't update the size attribute.
1383 mtx_lock(&np->n_mtx);
1384 np->n_attrstamp = 0;
1386 mtx_lock(&np->n_mtx);
1387 if (np->n_directio_asyncwr == 0)
1388 np->n_flag &= ~NMODIFIED;
1389 mtx_unlock(&np->n_mtx);
1391 ncl_downgrade_vnlock(vp, old_lock);
1396 * Initiate asynchronous I/O. Return an error if no nfsiods are available.
1397 * This is mainly to avoid queueing async I/O requests when the nfsiods
1398 * are all hung on a dead server.
1400 * Note: ncl_asyncio() does not clear (BIO_ERROR|B_INVAL) but when the bp
1401 * is eventually dequeued by the async daemon, ncl_doio() *will*.
1404 ncl_asyncio(struct nfsmount *nmp, struct buf *bp, struct ucred *cred, struct thread *td)
1413 * Commits are usually short and sweet so lets save some cpu and
1414 * leave the async daemons for more important rpc's (such as reads
1417 * Readdirplus RPCs do vget()s to acquire the vnodes for entries
1418 * in the directory in order to update attributes. This can deadlock
1419 * with another thread that is waiting for async I/O to be done by
1420 * an nfsiod thread while holding a lock on one of these vnodes.
1421 * To avoid this deadlock, don't allow the async nfsiod threads to
1422 * perform Readdirplus RPCs.
1424 mtx_lock(&ncl_iod_mutex);
1425 if ((bp->b_iocmd == BIO_WRITE && (bp->b_flags & B_NEEDCOMMIT) &&
1426 (nmp->nm_bufqiods > ncl_numasync / 2)) ||
1427 (bp->b_vp->v_type == VDIR && (nmp->nm_flag & NFSMNT_RDIRPLUS))) {
1428 mtx_unlock(&ncl_iod_mutex);
1432 if (nmp->nm_flag & NFSMNT_INT)
1437 * Find a free iod to process this request.
1439 for (iod = 0; iod < ncl_numasync; iod++)
1440 if (ncl_iodwant[iod] == NFSIOD_AVAILABLE) {
1446 * Try to create one if none are free.
1452 * Found one, so wake it up and tell it which
1455 NFS_DPF(ASYNCIO, ("ncl_asyncio: waking iod %d for mount %p\n",
1457 ncl_iodwant[iod] = NFSIOD_NOT_AVAILABLE;
1458 ncl_iodmount[iod] = nmp;
1460 wakeup(&ncl_iodwant[iod]);
1464 * If none are free, we may already have an iod working on this mount
1465 * point. If so, it will process our request.
1468 if (nmp->nm_bufqiods > 0) {
1470 ("ncl_asyncio: %d iods are already processing mount %p\n",
1471 nmp->nm_bufqiods, nmp));
1477 * If we have an iod which can process the request, then queue
1482 * Ensure that the queue never grows too large. We still want
1483 * to asynchronize so we block rather then return EIO.
1485 while (nmp->nm_bufqlen >= 2*ncl_numasync) {
1487 ("ncl_asyncio: waiting for mount %p queue to drain\n", nmp));
1488 nmp->nm_bufqwant = TRUE;
1489 error = newnfs_msleep(td, &nmp->nm_bufq,
1490 &ncl_iod_mutex, slpflag | PRIBIO, "nfsaio",
1493 error2 = newnfs_sigintr(nmp, td);
1495 mtx_unlock(&ncl_iod_mutex);
1498 if (slpflag == PCATCH) {
1504 * We might have lost our iod while sleeping,
1505 * so check and loop if nescessary.
1510 /* We might have lost our nfsiod */
1511 if (nmp->nm_bufqiods == 0) {
1513 ("ncl_asyncio: no iods after mount %p queue was drained, looping\n", nmp));
1517 if (bp->b_iocmd == BIO_READ) {
1518 if (bp->b_rcred == NOCRED && cred != NOCRED)
1519 bp->b_rcred = crhold(cred);
1521 if (bp->b_wcred == NOCRED && cred != NOCRED)
1522 bp->b_wcred = crhold(cred);
1525 if (bp->b_flags & B_REMFREE)
1528 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist);
1530 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1531 mtx_lock(&(VTONFS(bp->b_vp))->n_mtx);
1532 VTONFS(bp->b_vp)->n_flag |= NMODIFIED;
1533 VTONFS(bp->b_vp)->n_directio_asyncwr++;
1534 mtx_unlock(&(VTONFS(bp->b_vp))->n_mtx);
1536 mtx_unlock(&ncl_iod_mutex);
1540 mtx_unlock(&ncl_iod_mutex);
1543 * All the iods are busy on other mounts, so return EIO to
1544 * force the caller to process the i/o synchronously.
1546 NFS_DPF(ASYNCIO, ("ncl_asyncio: no iods available, i/o is synchronous\n"));
1551 ncl_doio_directwrite(struct buf *bp)
1553 int iomode, must_commit;
1554 struct uio *uiop = (struct uio *)bp->b_caller1;
1555 char *iov_base = uiop->uio_iov->iov_base;
1557 iomode = NFSWRITE_FILESYNC;
1558 uiop->uio_td = NULL; /* NULL since we're in nfsiod */
1559 ncl_writerpc(bp->b_vp, uiop, bp->b_wcred, &iomode, &must_commit, 0);
1560 KASSERT((must_commit == 0), ("ncl_doio_directwrite: Did not commit write"));
1561 free(iov_base, M_NFSDIRECTIO);
1562 free(uiop->uio_iov, M_NFSDIRECTIO);
1563 free(uiop, M_NFSDIRECTIO);
1564 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1565 struct nfsnode *np = VTONFS(bp->b_vp);
1566 mtx_lock(&np->n_mtx);
1567 if (NFSHASPNFS(VFSTONFS(vnode_mount(bp->b_vp)))) {
1569 * Invalidate the attribute cache, since writes to a DS
1570 * won't update the size attribute.
1572 np->n_attrstamp = 0;
1574 np->n_directio_asyncwr--;
1575 if (np->n_directio_asyncwr == 0) {
1576 np->n_flag &= ~NMODIFIED;
1577 if ((np->n_flag & NFSYNCWAIT)) {
1578 np->n_flag &= ~NFSYNCWAIT;
1579 wakeup((caddr_t)&np->n_directio_asyncwr);
1582 mtx_unlock(&np->n_mtx);
1585 relpbuf(bp, &ncl_pbuf_freecnt);
1589 * Do an I/O operation to/from a cache block. This may be called
1590 * synchronously or from an nfsiod.
1593 ncl_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td,
1594 int called_from_strategy)
1598 struct nfsmount *nmp;
1599 int error = 0, iomode, must_commit = 0;
1602 struct proc *p = td ? td->td_proc : NULL;
1606 nmp = VFSTONFS(vp->v_mount);
1608 uiop->uio_iov = &io;
1609 uiop->uio_iovcnt = 1;
1610 uiop->uio_segflg = UIO_SYSSPACE;
1614 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
1615 * do this here so we do not have to do it in all the code that
1618 bp->b_flags &= ~B_INVAL;
1619 bp->b_ioflags &= ~BIO_ERROR;
1621 KASSERT(!(bp->b_flags & B_DONE), ("ncl_doio: bp %p already marked done", bp));
1622 iocmd = bp->b_iocmd;
1623 if (iocmd == BIO_READ) {
1624 io.iov_len = uiop->uio_resid = bp->b_bcount;
1625 io.iov_base = bp->b_data;
1626 uiop->uio_rw = UIO_READ;
1628 switch (vp->v_type) {
1630 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
1631 NFSINCRGLOBAL(newnfsstats.read_bios);
1632 error = ncl_readrpc(vp, uiop, cr);
1635 if (uiop->uio_resid) {
1637 * If we had a short read with no error, we must have
1638 * hit a file hole. We should zero-fill the remainder.
1639 * This can also occur if the server hits the file EOF.
1641 * Holes used to be able to occur due to pending
1642 * writes, but that is not possible any longer.
1644 int nread = bp->b_bcount - uiop->uio_resid;
1645 ssize_t left = uiop->uio_resid;
1648 bzero((char *)bp->b_data + nread, left);
1649 uiop->uio_resid = 0;
1652 /* ASSERT_VOP_LOCKED(vp, "ncl_doio"); */
1653 if (p && (vp->v_vflag & VV_TEXT)) {
1654 mtx_lock(&np->n_mtx);
1655 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &np->n_vattr.na_mtime)) {
1656 mtx_unlock(&np->n_mtx);
1658 killproc(p, "text file modification");
1661 mtx_unlock(&np->n_mtx);
1665 uiop->uio_offset = (off_t)0;
1666 NFSINCRGLOBAL(newnfsstats.readlink_bios);
1667 error = ncl_readlinkrpc(vp, uiop, cr);
1670 NFSINCRGLOBAL(newnfsstats.readdir_bios);
1671 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
1672 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) != 0) {
1673 error = ncl_readdirplusrpc(vp, uiop, cr, td);
1674 if (error == NFSERR_NOTSUPP)
1675 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
1677 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
1678 error = ncl_readdirrpc(vp, uiop, cr, td);
1680 * end-of-directory sets B_INVAL but does not generate an
1683 if (error == 0 && uiop->uio_resid == bp->b_bcount)
1684 bp->b_flags |= B_INVAL;
1687 ncl_printf("ncl_doio: type %x unexpected\n", vp->v_type);
1691 bp->b_ioflags |= BIO_ERROR;
1692 bp->b_error = error;
1696 * If we only need to commit, try to commit
1698 if (bp->b_flags & B_NEEDCOMMIT) {
1702 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
1703 retv = ncl_commit(vp, off, bp->b_dirtyend-bp->b_dirtyoff,
1706 bp->b_dirtyoff = bp->b_dirtyend = 0;
1707 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1712 if (retv == NFSERR_STALEWRITEVERF) {
1713 ncl_clearcommit(vp->v_mount);
1718 * Setup for actual write
1720 mtx_lock(&np->n_mtx);
1721 if ((off_t)bp->b_blkno * DEV_BSIZE + bp->b_dirtyend > np->n_size)
1722 bp->b_dirtyend = np->n_size - (off_t)bp->b_blkno * DEV_BSIZE;
1723 mtx_unlock(&np->n_mtx);
1725 if (bp->b_dirtyend > bp->b_dirtyoff) {
1726 io.iov_len = uiop->uio_resid = bp->b_dirtyend
1728 uiop->uio_offset = (off_t)bp->b_blkno * DEV_BSIZE
1730 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
1731 uiop->uio_rw = UIO_WRITE;
1732 NFSINCRGLOBAL(newnfsstats.write_bios);
1734 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC)
1735 iomode = NFSWRITE_UNSTABLE;
1737 iomode = NFSWRITE_FILESYNC;
1739 error = ncl_writerpc(vp, uiop, cr, &iomode, &must_commit,
1740 called_from_strategy);
1743 * When setting B_NEEDCOMMIT also set B_CLUSTEROK to try
1744 * to cluster the buffers needing commit. This will allow
1745 * the system to submit a single commit rpc for the whole
1746 * cluster. We can do this even if the buffer is not 100%
1747 * dirty (relative to the NFS blocksize), so we optimize the
1748 * append-to-file-case.
1750 * (when clearing B_NEEDCOMMIT, B_CLUSTEROK must also be
1751 * cleared because write clustering only works for commit
1752 * rpc's, not for the data portion of the write).
1755 if (!error && iomode == NFSWRITE_UNSTABLE) {
1756 bp->b_flags |= B_NEEDCOMMIT;
1757 if (bp->b_dirtyoff == 0
1758 && bp->b_dirtyend == bp->b_bcount)
1759 bp->b_flags |= B_CLUSTEROK;
1761 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1765 * For an interrupted write, the buffer is still valid
1766 * and the write hasn't been pushed to the server yet,
1767 * so we can't set BIO_ERROR and report the interruption
1768 * by setting B_EINTR. For the B_ASYNC case, B_EINTR
1769 * is not relevant, so the rpc attempt is essentially
1770 * a noop. For the case of a V3 write rpc not being
1771 * committed to stable storage, the block is still
1772 * dirty and requires either a commit rpc or another
1773 * write rpc with iomode == NFSV3WRITE_FILESYNC before
1774 * the block is reused. This is indicated by setting
1775 * the B_DELWRI and B_NEEDCOMMIT flags.
1777 * EIO is returned by ncl_writerpc() to indicate a recoverable
1778 * write error and is handled as above, except that
1779 * B_EINTR isn't set. One cause of this is a stale stateid
1780 * error for the RPC that indicates recovery is required,
1781 * when called with called_from_strategy != 0.
1783 * If the buffer is marked B_PAGING, it does not reside on
1784 * the vp's paging queues so we cannot call bdirty(). The
1785 * bp in this case is not an NFS cache block so we should
1788 * The logic below breaks up errors into recoverable and
1789 * unrecoverable. For the former, we clear B_INVAL|B_NOCACHE
1790 * and keep the buffer around for potential write retries.
1791 * For the latter (eg ESTALE), we toss the buffer away (B_INVAL)
1792 * and save the error in the nfsnode. This is less than ideal
1793 * but necessary. Keeping such buffers around could potentially
1794 * cause buffer exhaustion eventually (they can never be written
1795 * out, so will get constantly be re-dirtied). It also causes
1796 * all sorts of vfs panics. For non-recoverable write errors,
1797 * also invalidate the attrcache, so we'll be forced to go over
1798 * the wire for this object, returning an error to user on next
1799 * call (most of the time).
1801 if (error == EINTR || error == EIO || error == ETIMEDOUT
1802 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
1806 bp->b_flags &= ~(B_INVAL|B_NOCACHE);
1807 if ((bp->b_flags & B_PAGING) == 0) {
1809 bp->b_flags &= ~B_DONE;
1811 if ((error == EINTR || error == ETIMEDOUT) &&
1812 (bp->b_flags & B_ASYNC) == 0)
1813 bp->b_flags |= B_EINTR;
1817 bp->b_ioflags |= BIO_ERROR;
1818 bp->b_flags |= B_INVAL;
1819 bp->b_error = np->n_error = error;
1820 mtx_lock(&np->n_mtx);
1821 np->n_flag |= NWRITEERR;
1822 np->n_attrstamp = 0;
1823 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1824 mtx_unlock(&np->n_mtx);
1826 bp->b_dirtyoff = bp->b_dirtyend = 0;
1834 bp->b_resid = uiop->uio_resid;
1836 ncl_clearcommit(vp->v_mount);
1842 * Used to aid in handling ftruncate() operations on the NFS client side.
1843 * Truncation creates a number of special problems for NFS. We have to
1844 * throw away VM pages and buffer cache buffers that are beyond EOF, and
1845 * we have to properly handle VM pages or (potentially dirty) buffers
1846 * that straddle the truncation point.
1850 ncl_meta_setsize(struct vnode *vp, struct ucred *cred, struct thread *td, u_quad_t nsize)
1852 struct nfsnode *np = VTONFS(vp);
1854 int biosize = vp->v_bufobj.bo_bsize;
1857 mtx_lock(&np->n_mtx);
1860 mtx_unlock(&np->n_mtx);
1862 if (nsize < tsize) {
1868 * vtruncbuf() doesn't get the buffer overlapping the
1869 * truncation point. We may have a B_DELWRI and/or B_CACHE
1870 * buffer that now needs to be truncated.
1872 error = vtruncbuf(vp, cred, nsize, biosize);
1873 lbn = nsize / biosize;
1874 bufsize = nsize - (lbn * biosize);
1875 bp = nfs_getcacheblk(vp, lbn, bufsize, td);
1878 if (bp->b_dirtyoff > bp->b_bcount)
1879 bp->b_dirtyoff = bp->b_bcount;
1880 if (bp->b_dirtyend > bp->b_bcount)
1881 bp->b_dirtyend = bp->b_bcount;
1882 bp->b_flags |= B_RELBUF; /* don't leave garbage around */
1885 vnode_pager_setsize(vp, nsize);