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 * If the requested page is partially valid, just return it and
133 * allow the pager to zero-out the blanks. Partially valid pages
134 * can only occur at the file EOF.
136 if (pages[ap->a_reqpage]->valid != 0) {
137 vm_pager_free_nonreq(object, pages, ap->a_reqpage, npages,
139 return (VM_PAGER_OK);
143 * We use only the kva address for the buffer, but this is extremely
144 * convienient and fast.
146 bp = getpbuf(&ncl_pbuf_freecnt);
148 kva = (vm_offset_t) bp->b_data;
149 pmap_qenter(kva, pages, npages);
150 PCPU_INC(cnt.v_vnodein);
151 PCPU_ADD(cnt.v_vnodepgsin, npages);
153 iov.iov_base = (caddr_t) kva;
157 uio.uio_offset = IDX_TO_OFF(pages[0]->pindex);
158 uio.uio_resid = count;
159 uio.uio_segflg = UIO_SYSSPACE;
160 uio.uio_rw = UIO_READ;
163 error = ncl_readrpc(vp, &uio, cred);
164 pmap_qremove(kva, npages);
166 relpbuf(bp, &ncl_pbuf_freecnt);
168 if (error && (uio.uio_resid == count)) {
169 ncl_printf("nfs_getpages: error %d\n", error);
170 vm_pager_free_nonreq(object, pages, ap->a_reqpage, npages,
172 return (VM_PAGER_ERROR);
176 * Calculate the number of bytes read and validate only that number
177 * of bytes. Note that due to pending writes, size may be 0. This
178 * does not mean that the remaining data is invalid!
181 size = count - uio.uio_resid;
182 VM_OBJECT_WLOCK(object);
183 for (i = 0, toff = 0; i < npages; i++, toff = nextoff) {
185 nextoff = toff + PAGE_SIZE;
188 if (nextoff <= size) {
190 * Read operation filled an entire page
192 m->valid = VM_PAGE_BITS_ALL;
193 KASSERT(m->dirty == 0,
194 ("nfs_getpages: page %p is dirty", m));
195 } else if (size > toff) {
197 * Read operation filled a partial page.
200 vm_page_set_valid_range(m, 0, size - toff);
201 KASSERT(m->dirty == 0,
202 ("nfs_getpages: page %p is dirty", m));
205 * Read operation was short. If no error
206 * occured we may have hit a zero-fill
207 * section. We leave valid set to 0, and page
208 * is freed by vm_page_readahead_finish() if
209 * its index is not equal to requested, or
210 * page is zeroed and set valid by
211 * vm_pager_get_pages() for requested page.
215 if (i != ap->a_reqpage)
216 vm_page_readahead_finish(m);
218 VM_OBJECT_WUNLOCK(object);
223 * Vnode op for VM putpages.
226 ncl_putpages(struct vop_putpages_args *ap)
232 int iomode, must_commit, i, error, npages, count;
238 struct nfsmount *nmp;
244 td = curthread; /* XXX */
245 /* Set the cred to n_writecred for the write rpcs. */
246 if (np->n_writecred != NULL)
247 cred = crhold(np->n_writecred);
249 cred = crhold(curthread->td_ucred); /* XXX */
250 nmp = VFSTONFS(vp->v_mount);
253 rtvals = ap->a_rtvals;
254 npages = btoc(count);
255 offset = IDX_TO_OFF(pages[0]->pindex);
257 mtx_lock(&nmp->nm_mtx);
258 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
259 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
260 mtx_unlock(&nmp->nm_mtx);
261 (void)ncl_fsinfo(nmp, vp, cred, td);
263 mtx_unlock(&nmp->nm_mtx);
265 mtx_lock(&np->n_mtx);
266 if (newnfs_directio_enable && !newnfs_directio_allow_mmap &&
267 (np->n_flag & NNONCACHE) && (vp->v_type == VREG)) {
268 mtx_unlock(&np->n_mtx);
269 ncl_printf("ncl_putpages: called on noncache-able vnode??\n");
270 mtx_lock(&np->n_mtx);
273 for (i = 0; i < npages; i++)
274 rtvals[i] = VM_PAGER_ERROR;
277 * When putting pages, do not extend file past EOF.
279 if (offset + count > np->n_size) {
280 count = np->n_size - offset;
284 mtx_unlock(&np->n_mtx);
287 * We use only the kva address for the buffer, but this is extremely
288 * convienient and fast.
290 bp = getpbuf(&ncl_pbuf_freecnt);
292 kva = (vm_offset_t) bp->b_data;
293 pmap_qenter(kva, pages, npages);
294 PCPU_INC(cnt.v_vnodeout);
295 PCPU_ADD(cnt.v_vnodepgsout, count);
297 iov.iov_base = (caddr_t) kva;
301 uio.uio_offset = offset;
302 uio.uio_resid = count;
303 uio.uio_segflg = UIO_SYSSPACE;
304 uio.uio_rw = UIO_WRITE;
307 if ((ap->a_sync & VM_PAGER_PUT_SYNC) == 0)
308 iomode = NFSWRITE_UNSTABLE;
310 iomode = NFSWRITE_FILESYNC;
312 error = ncl_writerpc(vp, &uio, cred, &iomode, &must_commit, 0);
315 pmap_qremove(kva, npages);
316 relpbuf(bp, &ncl_pbuf_freecnt);
318 if (error == 0 || !nfs_keep_dirty_on_error) {
319 vnode_pager_undirty_pages(pages, rtvals, count - uio.uio_resid);
321 ncl_clearcommit(vp->v_mount);
327 * For nfs, cache consistency can only be maintained approximately.
328 * Although RFC1094 does not specify the criteria, the following is
329 * believed to be compatible with the reference port.
331 * If the file's modify time on the server has changed since the
332 * last read rpc or you have written to the file,
333 * you may have lost data cache consistency with the
334 * server, so flush all of the file's data out of the cache.
335 * Then force a getattr rpc to ensure that you have up to date
337 * NB: This implies that cache data can be read when up to
338 * NFS_ATTRTIMEO seconds out of date. If you find that you need current
339 * attributes this could be forced by setting n_attrstamp to 0 before
340 * the VOP_GETATTR() call.
343 nfs_bioread_check_cons(struct vnode *vp, struct thread *td, struct ucred *cred)
347 struct nfsnode *np = VTONFS(vp);
351 * Grab the exclusive lock before checking whether the cache is
353 * XXX - We can make this cheaper later (by acquiring cheaper locks).
354 * But for now, this suffices.
356 old_lock = ncl_upgrade_vnlock(vp);
357 if (vp->v_iflag & VI_DOOMED) {
358 ncl_downgrade_vnlock(vp, old_lock);
362 mtx_lock(&np->n_mtx);
363 if (np->n_flag & NMODIFIED) {
364 mtx_unlock(&np->n_mtx);
365 if (vp->v_type != VREG) {
366 if (vp->v_type != VDIR)
367 panic("nfs: bioread, not dir");
369 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
374 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
375 error = VOP_GETATTR(vp, &vattr, cred);
378 mtx_lock(&np->n_mtx);
379 np->n_mtime = vattr.va_mtime;
380 mtx_unlock(&np->n_mtx);
382 mtx_unlock(&np->n_mtx);
383 error = VOP_GETATTR(vp, &vattr, cred);
386 mtx_lock(&np->n_mtx);
387 if ((np->n_flag & NSIZECHANGED)
388 || (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime))) {
389 mtx_unlock(&np->n_mtx);
390 if (vp->v_type == VDIR)
392 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
395 mtx_lock(&np->n_mtx);
396 np->n_mtime = vattr.va_mtime;
397 np->n_flag &= ~NSIZECHANGED;
399 mtx_unlock(&np->n_mtx);
402 ncl_downgrade_vnlock(vp, old_lock);
407 * Vnode op for read using bio
410 ncl_bioread(struct vnode *vp, struct uio *uio, int ioflag, struct ucred *cred)
412 struct nfsnode *np = VTONFS(vp);
414 struct buf *bp, *rabp;
416 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
420 int nra, error = 0, n = 0, on = 0;
423 KASSERT(uio->uio_rw == UIO_READ, ("ncl_read mode"));
424 if (uio->uio_resid == 0)
426 if (uio->uio_offset < 0) /* XXX VDIR cookies can be negative */
430 mtx_lock(&nmp->nm_mtx);
431 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
432 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
433 mtx_unlock(&nmp->nm_mtx);
434 (void)ncl_fsinfo(nmp, vp, cred, td);
435 mtx_lock(&nmp->nm_mtx);
437 if (nmp->nm_rsize == 0 || nmp->nm_readdirsize == 0)
438 (void) newnfs_iosize(nmp);
440 tmp_off = uio->uio_offset + uio->uio_resid;
441 if (vp->v_type != VDIR &&
442 (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)) {
443 mtx_unlock(&nmp->nm_mtx);
446 mtx_unlock(&nmp->nm_mtx);
448 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && (vp->v_type == VREG))
449 /* No caching/ no readaheads. Just read data into the user buffer */
450 return ncl_readrpc(vp, uio, cred);
452 biosize = vp->v_bufobj.bo_bsize;
453 seqcount = (int)((off_t)(ioflag >> IO_SEQSHIFT) * biosize / BKVASIZE);
455 error = nfs_bioread_check_cons(vp, td, cred);
462 mtx_lock(&np->n_mtx);
464 mtx_unlock(&np->n_mtx);
466 switch (vp->v_type) {
468 NFSINCRGLOBAL(newnfsstats.biocache_reads);
469 lbn = uio->uio_offset / biosize;
470 on = uio->uio_offset - (lbn * biosize);
473 * Start the read ahead(s), as required.
475 if (nmp->nm_readahead > 0) {
476 for (nra = 0; nra < nmp->nm_readahead && nra < seqcount &&
477 (off_t)(lbn + 1 + nra) * biosize < nsize; nra++) {
478 rabn = lbn + 1 + nra;
479 if (incore(&vp->v_bufobj, rabn) == NULL) {
480 rabp = nfs_getcacheblk(vp, rabn, biosize, td);
482 error = newnfs_sigintr(nmp, td);
483 return (error ? error : EINTR);
485 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
486 rabp->b_flags |= B_ASYNC;
487 rabp->b_iocmd = BIO_READ;
488 vfs_busy_pages(rabp, 0);
489 if (ncl_asyncio(nmp, rabp, cred, td)) {
490 rabp->b_flags |= B_INVAL;
491 rabp->b_ioflags |= BIO_ERROR;
492 vfs_unbusy_pages(rabp);
503 /* Note that bcount is *not* DEV_BSIZE aligned. */
505 if ((off_t)lbn * biosize >= nsize) {
507 } else if ((off_t)(lbn + 1) * biosize > nsize) {
508 bcount = nsize - (off_t)lbn * biosize;
510 bp = nfs_getcacheblk(vp, lbn, bcount, td);
513 error = newnfs_sigintr(nmp, td);
514 return (error ? error : EINTR);
518 * If B_CACHE is not set, we must issue the read. If this
519 * fails, we return an error.
522 if ((bp->b_flags & B_CACHE) == 0) {
523 bp->b_iocmd = BIO_READ;
524 vfs_busy_pages(bp, 0);
525 error = ncl_doio(vp, bp, cred, td, 0);
533 * on is the offset into the current bp. Figure out how many
534 * bytes we can copy out of the bp. Note that bcount is
535 * NOT DEV_BSIZE aligned.
537 * Then figure out how many bytes we can copy into the uio.
542 n = MIN((unsigned)(bcount - on), uio->uio_resid);
545 NFSINCRGLOBAL(newnfsstats.biocache_readlinks);
546 bp = nfs_getcacheblk(vp, (daddr_t)0, NFS_MAXPATHLEN, td);
548 error = newnfs_sigintr(nmp, td);
549 return (error ? error : EINTR);
551 if ((bp->b_flags & B_CACHE) == 0) {
552 bp->b_iocmd = BIO_READ;
553 vfs_busy_pages(bp, 0);
554 error = ncl_doio(vp, bp, cred, td, 0);
556 bp->b_ioflags |= BIO_ERROR;
561 n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
565 NFSINCRGLOBAL(newnfsstats.biocache_readdirs);
566 if (np->n_direofoffset
567 && uio->uio_offset >= np->n_direofoffset) {
570 lbn = (uoff_t)uio->uio_offset / NFS_DIRBLKSIZ;
571 on = uio->uio_offset & (NFS_DIRBLKSIZ - 1);
572 bp = nfs_getcacheblk(vp, lbn, NFS_DIRBLKSIZ, td);
574 error = newnfs_sigintr(nmp, td);
575 return (error ? error : EINTR);
577 if ((bp->b_flags & B_CACHE) == 0) {
578 bp->b_iocmd = BIO_READ;
579 vfs_busy_pages(bp, 0);
580 error = ncl_doio(vp, bp, cred, td, 0);
584 while (error == NFSERR_BAD_COOKIE) {
586 error = ncl_vinvalbuf(vp, 0, td, 1);
588 * Yuck! The directory has been modified on the
589 * server. The only way to get the block is by
590 * reading from the beginning to get all the
593 * Leave the last bp intact unless there is an error.
594 * Loop back up to the while if the error is another
595 * NFSERR_BAD_COOKIE (double yuch!).
597 for (i = 0; i <= lbn && !error; i++) {
598 if (np->n_direofoffset
599 && (i * NFS_DIRBLKSIZ) >= np->n_direofoffset)
601 bp = nfs_getcacheblk(vp, i, NFS_DIRBLKSIZ, td);
603 error = newnfs_sigintr(nmp, td);
604 return (error ? error : EINTR);
606 if ((bp->b_flags & B_CACHE) == 0) {
607 bp->b_iocmd = BIO_READ;
608 vfs_busy_pages(bp, 0);
609 error = ncl_doio(vp, bp, cred, td, 0);
611 * no error + B_INVAL == directory EOF,
614 if (error == 0 && (bp->b_flags & B_INVAL))
618 * An error will throw away the block and the
619 * for loop will break out. If no error and this
620 * is not the block we want, we throw away the
621 * block and go for the next one via the for loop.
623 if (error || i < lbn)
628 * The above while is repeated if we hit another cookie
629 * error. If we hit an error and it wasn't a cookie error,
637 * If not eof and read aheads are enabled, start one.
638 * (You need the current block first, so that you have the
639 * directory offset cookie of the next block.)
641 if (nmp->nm_readahead > 0 &&
642 (bp->b_flags & B_INVAL) == 0 &&
643 (np->n_direofoffset == 0 ||
644 (lbn + 1) * NFS_DIRBLKSIZ < np->n_direofoffset) &&
645 incore(&vp->v_bufobj, lbn + 1) == NULL) {
646 rabp = nfs_getcacheblk(vp, lbn + 1, NFS_DIRBLKSIZ, td);
648 if ((rabp->b_flags & (B_CACHE|B_DELWRI)) == 0) {
649 rabp->b_flags |= B_ASYNC;
650 rabp->b_iocmd = BIO_READ;
651 vfs_busy_pages(rabp, 0);
652 if (ncl_asyncio(nmp, rabp, cred, td)) {
653 rabp->b_flags |= B_INVAL;
654 rabp->b_ioflags |= BIO_ERROR;
655 vfs_unbusy_pages(rabp);
664 * Unlike VREG files, whos buffer size ( bp->b_bcount ) is
665 * chopped for the EOF condition, we cannot tell how large
666 * NFS directories are going to be until we hit EOF. So
667 * an NFS directory buffer is *not* chopped to its EOF. Now,
668 * it just so happens that b_resid will effectively chop it
669 * to EOF. *BUT* this information is lost if the buffer goes
670 * away and is reconstituted into a B_CACHE state ( due to
671 * being VMIO ) later. So we keep track of the directory eof
672 * in np->n_direofoffset and chop it off as an extra step
675 n = lmin(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid - on);
676 if (np->n_direofoffset && n > np->n_direofoffset - uio->uio_offset)
677 n = np->n_direofoffset - uio->uio_offset;
680 ncl_printf(" ncl_bioread: type %x unexpected\n", vp->v_type);
686 error = vn_io_fault_uiomove(bp->b_data + on, (int)n, uio);
688 if (vp->v_type == VLNK)
692 } while (error == 0 && uio->uio_resid > 0 && n > 0);
697 * The NFS write path cannot handle iovecs with len > 1. So we need to
698 * break up iovecs accordingly (restricting them to wsize).
699 * For the SYNC case, we can do this with 1 copy (user buffer -> mbuf).
700 * For the ASYNC case, 2 copies are needed. The first a copy from the
701 * user buffer to a staging buffer and then a second copy from the staging
702 * buffer to mbufs. This can be optimized by copying from the user buffer
703 * directly into mbufs and passing the chain down, but that requires a
704 * fair amount of re-working of the relevant codepaths (and can be done
708 nfs_directio_write(vp, uiop, cred, ioflag)
715 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
716 struct thread *td = uiop->uio_td;
720 mtx_lock(&nmp->nm_mtx);
721 wsize = nmp->nm_wsize;
722 mtx_unlock(&nmp->nm_mtx);
723 if (ioflag & IO_SYNC) {
724 int iomode, must_commit;
728 while (uiop->uio_resid > 0) {
729 size = MIN(uiop->uio_resid, wsize);
730 size = MIN(uiop->uio_iov->iov_len, size);
731 iov.iov_base = uiop->uio_iov->iov_base;
735 uio.uio_offset = uiop->uio_offset;
736 uio.uio_resid = size;
737 uio.uio_segflg = UIO_USERSPACE;
738 uio.uio_rw = UIO_WRITE;
740 iomode = NFSWRITE_FILESYNC;
741 error = ncl_writerpc(vp, &uio, cred, &iomode,
743 KASSERT((must_commit == 0),
744 ("ncl_directio_write: Did not commit write"));
747 uiop->uio_offset += size;
748 uiop->uio_resid -= size;
749 if (uiop->uio_iov->iov_len <= size) {
753 uiop->uio_iov->iov_base =
754 (char *)uiop->uio_iov->iov_base + size;
755 uiop->uio_iov->iov_len -= size;
764 * Break up the write into blocksize chunks and hand these
765 * over to nfsiod's for write back.
766 * Unfortunately, this incurs a copy of the data. Since
767 * the user could modify the buffer before the write is
770 * The obvious optimization here is that one of the 2 copies
771 * in the async write path can be eliminated by copying the
772 * data here directly into mbufs and passing the mbuf chain
773 * down. But that will require a fair amount of re-working
774 * of the code and can be done if there's enough interest
775 * in NFS directio access.
777 while (uiop->uio_resid > 0) {
778 size = MIN(uiop->uio_resid, wsize);
779 size = MIN(uiop->uio_iov->iov_len, size);
780 bp = getpbuf(&ncl_pbuf_freecnt);
781 t_uio = malloc(sizeof(struct uio), M_NFSDIRECTIO, M_WAITOK);
782 t_iov = malloc(sizeof(struct iovec), M_NFSDIRECTIO, M_WAITOK);
783 t_iov->iov_base = malloc(size, M_NFSDIRECTIO, M_WAITOK);
784 t_iov->iov_len = size;
785 t_uio->uio_iov = t_iov;
786 t_uio->uio_iovcnt = 1;
787 t_uio->uio_offset = uiop->uio_offset;
788 t_uio->uio_resid = size;
789 t_uio->uio_segflg = UIO_SYSSPACE;
790 t_uio->uio_rw = UIO_WRITE;
792 KASSERT(uiop->uio_segflg == UIO_USERSPACE ||
793 uiop->uio_segflg == UIO_SYSSPACE,
794 ("nfs_directio_write: Bad uio_segflg"));
795 if (uiop->uio_segflg == UIO_USERSPACE) {
796 error = copyin(uiop->uio_iov->iov_base,
797 t_iov->iov_base, size);
802 * UIO_SYSSPACE may never happen, but handle
803 * it just in case it does.
805 bcopy(uiop->uio_iov->iov_base, t_iov->iov_base,
807 bp->b_flags |= B_DIRECT;
808 bp->b_iocmd = BIO_WRITE;
809 if (cred != NOCRED) {
813 bp->b_wcred = NOCRED;
814 bp->b_caller1 = (void *)t_uio;
816 error = ncl_asyncio(nmp, bp, NOCRED, td);
819 free(t_iov->iov_base, M_NFSDIRECTIO);
820 free(t_iov, M_NFSDIRECTIO);
821 free(t_uio, M_NFSDIRECTIO);
823 relpbuf(bp, &ncl_pbuf_freecnt);
828 uiop->uio_offset += size;
829 uiop->uio_resid -= size;
830 if (uiop->uio_iov->iov_len <= size) {
834 uiop->uio_iov->iov_base =
835 (char *)uiop->uio_iov->iov_base + size;
836 uiop->uio_iov->iov_len -= size;
844 * Vnode op for write using bio
847 ncl_write(struct vop_write_args *ap)
850 struct uio *uio = ap->a_uio;
851 struct thread *td = uio->uio_td;
852 struct vnode *vp = ap->a_vp;
853 struct nfsnode *np = VTONFS(vp);
854 struct ucred *cred = ap->a_cred;
855 int ioflag = ap->a_ioflag;
858 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
860 int bcount, noncontig_write, obcount;
861 int bp_cached, n, on, error = 0, error1, wouldcommit;
862 size_t orig_resid, local_resid;
863 off_t orig_size, tmp_off;
865 KASSERT(uio->uio_rw == UIO_WRITE, ("ncl_write mode"));
866 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
868 if (vp->v_type != VREG)
870 mtx_lock(&np->n_mtx);
871 if (np->n_flag & NWRITEERR) {
872 np->n_flag &= ~NWRITEERR;
873 mtx_unlock(&np->n_mtx);
874 return (np->n_error);
876 mtx_unlock(&np->n_mtx);
877 mtx_lock(&nmp->nm_mtx);
878 if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
879 (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
880 mtx_unlock(&nmp->nm_mtx);
881 (void)ncl_fsinfo(nmp, vp, cred, td);
882 mtx_lock(&nmp->nm_mtx);
884 if (nmp->nm_wsize == 0)
885 (void) newnfs_iosize(nmp);
886 mtx_unlock(&nmp->nm_mtx);
889 * Synchronously flush pending buffers if we are in synchronous
890 * mode or if we are appending.
892 if (ioflag & (IO_APPEND | IO_SYNC)) {
893 mtx_lock(&np->n_mtx);
894 if (np->n_flag & NMODIFIED) {
895 mtx_unlock(&np->n_mtx);
896 #ifdef notyet /* Needs matching nonblock semantics elsewhere, too. */
898 * Require non-blocking, synchronous writes to
899 * dirty files to inform the program it needs
900 * to fsync(2) explicitly.
902 if (ioflag & IO_NDELAY)
906 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
907 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
911 mtx_unlock(&np->n_mtx);
914 orig_resid = uio->uio_resid;
915 mtx_lock(&np->n_mtx);
916 orig_size = np->n_size;
917 mtx_unlock(&np->n_mtx);
920 * If IO_APPEND then load uio_offset. We restart here if we cannot
921 * get the append lock.
923 if (ioflag & IO_APPEND) {
925 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
926 error = VOP_GETATTR(vp, &vattr, cred);
929 mtx_lock(&np->n_mtx);
930 uio->uio_offset = np->n_size;
931 mtx_unlock(&np->n_mtx);
934 if (uio->uio_offset < 0)
936 tmp_off = uio->uio_offset + uio->uio_resid;
937 if (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset)
939 if (uio->uio_resid == 0)
942 if (newnfs_directio_enable && (ioflag & IO_DIRECT) && vp->v_type == VREG)
943 return nfs_directio_write(vp, uio, cred, ioflag);
946 * Maybe this should be above the vnode op call, but so long as
947 * file servers have no limits, i don't think it matters
949 if (vn_rlimit_fsize(vp, uio, td))
952 biosize = vp->v_bufobj.bo_bsize;
954 * Find all of this file's B_NEEDCOMMIT buffers. If our writes
955 * would exceed the local maximum per-file write commit size when
956 * combined with those, we must decide whether to flush,
957 * go synchronous, or return error. We don't bother checking
958 * IO_UNIT -- we just make all writes atomic anyway, as there's
959 * no point optimizing for something that really won't ever happen.
962 if (!(ioflag & IO_SYNC)) {
965 mtx_lock(&np->n_mtx);
967 mtx_unlock(&np->n_mtx);
968 if (nflag & NMODIFIED) {
969 BO_LOCK(&vp->v_bufobj);
970 if (vp->v_bufobj.bo_dirty.bv_cnt != 0) {
971 TAILQ_FOREACH(bp, &vp->v_bufobj.bo_dirty.bv_hd,
973 if (bp->b_flags & B_NEEDCOMMIT)
974 wouldcommit += bp->b_bcount;
977 BO_UNLOCK(&vp->v_bufobj);
982 if (!(ioflag & IO_SYNC)) {
983 wouldcommit += biosize;
984 if (wouldcommit > nmp->nm_wcommitsize) {
986 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
987 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
990 wouldcommit = biosize;
994 NFSINCRGLOBAL(newnfsstats.biocache_writes);
995 lbn = uio->uio_offset / biosize;
996 on = uio->uio_offset - (lbn * biosize);
997 n = MIN((unsigned)(biosize - on), uio->uio_resid);
1000 * Handle direct append and file extension cases, calculate
1001 * unaligned buffer size.
1003 mtx_lock(&np->n_mtx);
1004 if ((np->n_flag & NHASBEENLOCKED) == 0 &&
1005 (nmp->nm_flag & NFSMNT_NONCONTIGWR) != 0)
1006 noncontig_write = 1;
1008 noncontig_write = 0;
1009 if ((uio->uio_offset == np->n_size ||
1010 (noncontig_write != 0 &&
1011 lbn == (np->n_size / biosize) &&
1012 uio->uio_offset + n > np->n_size)) && n) {
1013 mtx_unlock(&np->n_mtx);
1015 * Get the buffer (in its pre-append state to maintain
1016 * B_CACHE if it was previously set). Resize the
1017 * nfsnode after we have locked the buffer to prevent
1018 * readers from reading garbage.
1020 obcount = np->n_size - (lbn * biosize);
1021 bp = nfs_getcacheblk(vp, lbn, obcount, td);
1026 mtx_lock(&np->n_mtx);
1027 np->n_size = uio->uio_offset + n;
1028 np->n_flag |= NMODIFIED;
1029 vnode_pager_setsize(vp, np->n_size);
1030 mtx_unlock(&np->n_mtx);
1032 save = bp->b_flags & B_CACHE;
1034 allocbuf(bp, bcount);
1035 bp->b_flags |= save;
1036 if (noncontig_write != 0 && on > obcount)
1037 vfs_bio_bzero_buf(bp, obcount, on -
1042 * Obtain the locked cache block first, and then
1043 * adjust the file's size as appropriate.
1046 if ((off_t)lbn * biosize + bcount < np->n_size) {
1047 if ((off_t)(lbn + 1) * biosize < np->n_size)
1050 bcount = np->n_size - (off_t)lbn * biosize;
1052 mtx_unlock(&np->n_mtx);
1053 bp = nfs_getcacheblk(vp, lbn, bcount, td);
1054 mtx_lock(&np->n_mtx);
1055 if (uio->uio_offset + n > np->n_size) {
1056 np->n_size = uio->uio_offset + n;
1057 np->n_flag |= NMODIFIED;
1058 vnode_pager_setsize(vp, np->n_size);
1060 mtx_unlock(&np->n_mtx);
1064 error = newnfs_sigintr(nmp, td);
1071 * Issue a READ if B_CACHE is not set. In special-append
1072 * mode, B_CACHE is based on the buffer prior to the write
1073 * op and is typically set, avoiding the read. If a read
1074 * is required in special append mode, the server will
1075 * probably send us a short-read since we extended the file
1076 * on our end, resulting in b_resid == 0 and, thusly,
1077 * B_CACHE getting set.
1079 * We can also avoid issuing the read if the write covers
1080 * the entire buffer. We have to make sure the buffer state
1081 * is reasonable in this case since we will not be initiating
1082 * I/O. See the comments in kern/vfs_bio.c's getblk() for
1085 * B_CACHE may also be set due to the buffer being cached
1090 if (on == 0 && n == bcount) {
1091 if ((bp->b_flags & B_CACHE) == 0)
1093 bp->b_flags |= B_CACHE;
1094 bp->b_flags &= ~B_INVAL;
1095 bp->b_ioflags &= ~BIO_ERROR;
1098 if ((bp->b_flags & B_CACHE) == 0) {
1099 bp->b_iocmd = BIO_READ;
1100 vfs_busy_pages(bp, 0);
1101 error = ncl_doio(vp, bp, cred, td, 0);
1107 if (bp->b_wcred == NOCRED)
1108 bp->b_wcred = crhold(cred);
1109 mtx_lock(&np->n_mtx);
1110 np->n_flag |= NMODIFIED;
1111 mtx_unlock(&np->n_mtx);
1114 * If dirtyend exceeds file size, chop it down. This should
1115 * not normally occur but there is an append race where it
1116 * might occur XXX, so we log it.
1118 * If the chopping creates a reverse-indexed or degenerate
1119 * situation with dirtyoff/end, we 0 both of them.
1122 if (bp->b_dirtyend > bcount) {
1123 ncl_printf("NFS append race @%lx:%d\n",
1124 (long)bp->b_blkno * DEV_BSIZE,
1125 bp->b_dirtyend - bcount);
1126 bp->b_dirtyend = bcount;
1129 if (bp->b_dirtyoff >= bp->b_dirtyend)
1130 bp->b_dirtyoff = bp->b_dirtyend = 0;
1133 * If the new write will leave a contiguous dirty
1134 * area, just update the b_dirtyoff and b_dirtyend,
1135 * otherwise force a write rpc of the old dirty area.
1137 * If there has been a file lock applied to this file
1138 * or vfs.nfs.old_noncontig_writing is set, do the following:
1139 * While it is possible to merge discontiguous writes due to
1140 * our having a B_CACHE buffer ( and thus valid read data
1141 * for the hole), we don't because it could lead to
1142 * significant cache coherency problems with multiple clients,
1143 * especially if locking is implemented later on.
1145 * If vfs.nfs.old_noncontig_writing is not set and there has
1146 * not been file locking done on this file:
1147 * Relax coherency a bit for the sake of performance and
1148 * expand the current dirty region to contain the new
1149 * write even if it means we mark some non-dirty data as
1153 if (noncontig_write == 0 && bp->b_dirtyend > 0 &&
1154 (on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
1155 if (bwrite(bp) == EINTR) {
1162 local_resid = uio->uio_resid;
1163 error = vn_io_fault_uiomove((char *)bp->b_data + on, n, uio);
1165 if (error != 0 && !bp_cached) {
1167 * This block has no other content then what
1168 * possibly was written by the faulty uiomove.
1169 * Release it, forgetting the data pages, to
1170 * prevent the leak of uninitialized data to
1173 bp->b_ioflags |= BIO_ERROR;
1175 uio->uio_offset -= local_resid - uio->uio_resid;
1176 uio->uio_resid = local_resid;
1181 * Since this block is being modified, it must be written
1182 * again and not just committed. Since write clustering does
1183 * not work for the stage 1 data write, only the stage 2
1184 * commit rpc, we have to clear B_CLUSTEROK as well.
1186 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1189 * Get the partial update on the progress made from
1190 * uiomove, if an error occured.
1193 n = local_resid - uio->uio_resid;
1196 * Only update dirtyoff/dirtyend if not a degenerate
1200 if (bp->b_dirtyend > 0) {
1201 bp->b_dirtyoff = min(on, bp->b_dirtyoff);
1202 bp->b_dirtyend = max((on + n), bp->b_dirtyend);
1204 bp->b_dirtyoff = on;
1205 bp->b_dirtyend = on + n;
1207 vfs_bio_set_valid(bp, on, n);
1211 * If IO_SYNC do bwrite().
1213 * IO_INVAL appears to be unused. The idea appears to be
1214 * to turn off caching in this case. Very odd. XXX
1216 if ((ioflag & IO_SYNC)) {
1217 if (ioflag & IO_INVAL)
1218 bp->b_flags |= B_NOCACHE;
1219 error1 = bwrite(bp);
1225 } else if ((n + on) == biosize) {
1226 bp->b_flags |= B_ASYNC;
1227 (void) ncl_writebp(bp, 0, NULL);
1234 } while (uio->uio_resid > 0 && n > 0);
1237 if (ioflag & IO_UNIT) {
1239 vattr.va_size = orig_size;
1240 /* IO_SYNC is handled implicitely */
1241 (void)VOP_SETATTR(vp, &vattr, cred);
1242 uio->uio_offset -= orig_resid - uio->uio_resid;
1243 uio->uio_resid = orig_resid;
1251 * Get an nfs cache block.
1253 * Allocate a new one if the block isn't currently in the cache
1254 * and return the block marked busy. If the calling process is
1255 * interrupted by a signal for an interruptible mount point, return
1258 * The caller must carefully deal with the possible B_INVAL state of
1259 * the buffer. ncl_doio() clears B_INVAL (and ncl_asyncio() clears it
1260 * indirectly), so synchronous reads can be issued without worrying about
1261 * the B_INVAL state. We have to be a little more careful when dealing
1262 * with writes (see comments in nfs_write()) when extending a file past
1266 nfs_getcacheblk(struct vnode *vp, daddr_t bn, int size, struct thread *td)
1270 struct nfsmount *nmp;
1275 if (nmp->nm_flag & NFSMNT_INT) {
1278 newnfs_set_sigmask(td, &oldset);
1279 bp = getblk(vp, bn, size, PCATCH, 0, 0);
1280 newnfs_restore_sigmask(td, &oldset);
1281 while (bp == NULL) {
1282 if (newnfs_sigintr(nmp, td))
1284 bp = getblk(vp, bn, size, 0, 2 * hz, 0);
1287 bp = getblk(vp, bn, size, 0, 0, 0);
1290 if (vp->v_type == VREG)
1291 bp->b_blkno = bn * (vp->v_bufobj.bo_bsize / DEV_BSIZE);
1296 * Flush and invalidate all dirty buffers. If another process is already
1297 * doing the flush, just wait for completion.
1300 ncl_vinvalbuf(struct vnode *vp, int flags, struct thread *td, int intrflg)
1302 struct nfsnode *np = VTONFS(vp);
1303 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
1304 int error = 0, slpflag, slptimeo;
1307 ASSERT_VOP_LOCKED(vp, "ncl_vinvalbuf");
1309 if ((nmp->nm_flag & NFSMNT_INT) == 0)
1311 if ((nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF))
1321 old_lock = ncl_upgrade_vnlock(vp);
1322 if (vp->v_iflag & VI_DOOMED) {
1324 * Since vgonel() uses the generic vinvalbuf() to flush
1325 * dirty buffers and it does not call this function, it
1326 * is safe to just return OK when VI_DOOMED is set.
1328 ncl_downgrade_vnlock(vp, old_lock);
1333 * Now, flush as required.
1335 if ((flags & V_SAVE) && (vp->v_bufobj.bo_object != NULL)) {
1336 VM_OBJECT_WLOCK(vp->v_bufobj.bo_object);
1337 vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
1338 VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object);
1340 * If the page clean was interrupted, fail the invalidation.
1341 * Not doing so, we run the risk of losing dirty pages in the
1342 * vinvalbuf() call below.
1344 if (intrflg && (error = newnfs_sigintr(nmp, td)))
1348 error = vinvalbuf(vp, flags, slpflag, 0);
1350 if (intrflg && (error = newnfs_sigintr(nmp, td)))
1352 error = vinvalbuf(vp, flags, 0, slptimeo);
1354 if (NFSHASPNFS(nmp)) {
1355 nfscl_layoutcommit(vp, td);
1357 * Invalidate the attribute cache, since writes to a DS
1358 * won't update the size attribute.
1360 mtx_lock(&np->n_mtx);
1361 np->n_attrstamp = 0;
1363 mtx_lock(&np->n_mtx);
1364 if (np->n_directio_asyncwr == 0)
1365 np->n_flag &= ~NMODIFIED;
1366 mtx_unlock(&np->n_mtx);
1368 ncl_downgrade_vnlock(vp, old_lock);
1373 * Initiate asynchronous I/O. Return an error if no nfsiods are available.
1374 * This is mainly to avoid queueing async I/O requests when the nfsiods
1375 * are all hung on a dead server.
1377 * Note: ncl_asyncio() does not clear (BIO_ERROR|B_INVAL) but when the bp
1378 * is eventually dequeued by the async daemon, ncl_doio() *will*.
1381 ncl_asyncio(struct nfsmount *nmp, struct buf *bp, struct ucred *cred, struct thread *td)
1390 * Commits are usually short and sweet so lets save some cpu and
1391 * leave the async daemons for more important rpc's (such as reads
1394 * Readdirplus RPCs do vget()s to acquire the vnodes for entries
1395 * in the directory in order to update attributes. This can deadlock
1396 * with another thread that is waiting for async I/O to be done by
1397 * an nfsiod thread while holding a lock on one of these vnodes.
1398 * To avoid this deadlock, don't allow the async nfsiod threads to
1399 * perform Readdirplus RPCs.
1401 mtx_lock(&ncl_iod_mutex);
1402 if ((bp->b_iocmd == BIO_WRITE && (bp->b_flags & B_NEEDCOMMIT) &&
1403 (nmp->nm_bufqiods > ncl_numasync / 2)) ||
1404 (bp->b_vp->v_type == VDIR && (nmp->nm_flag & NFSMNT_RDIRPLUS))) {
1405 mtx_unlock(&ncl_iod_mutex);
1409 if (nmp->nm_flag & NFSMNT_INT)
1414 * Find a free iod to process this request.
1416 for (iod = 0; iod < ncl_numasync; iod++)
1417 if (ncl_iodwant[iod] == NFSIOD_AVAILABLE) {
1423 * Try to create one if none are free.
1429 * Found one, so wake it up and tell it which
1432 NFS_DPF(ASYNCIO, ("ncl_asyncio: waking iod %d for mount %p\n",
1434 ncl_iodwant[iod] = NFSIOD_NOT_AVAILABLE;
1435 ncl_iodmount[iod] = nmp;
1437 wakeup(&ncl_iodwant[iod]);
1441 * If none are free, we may already have an iod working on this mount
1442 * point. If so, it will process our request.
1445 if (nmp->nm_bufqiods > 0) {
1447 ("ncl_asyncio: %d iods are already processing mount %p\n",
1448 nmp->nm_bufqiods, nmp));
1454 * If we have an iod which can process the request, then queue
1459 * Ensure that the queue never grows too large. We still want
1460 * to asynchronize so we block rather then return EIO.
1462 while (nmp->nm_bufqlen >= 2*ncl_numasync) {
1464 ("ncl_asyncio: waiting for mount %p queue to drain\n", nmp));
1465 nmp->nm_bufqwant = TRUE;
1466 error = newnfs_msleep(td, &nmp->nm_bufq,
1467 &ncl_iod_mutex, slpflag | PRIBIO, "nfsaio",
1470 error2 = newnfs_sigintr(nmp, td);
1472 mtx_unlock(&ncl_iod_mutex);
1475 if (slpflag == PCATCH) {
1481 * We might have lost our iod while sleeping,
1482 * so check and loop if nescessary.
1487 /* We might have lost our nfsiod */
1488 if (nmp->nm_bufqiods == 0) {
1490 ("ncl_asyncio: no iods after mount %p queue was drained, looping\n", nmp));
1494 if (bp->b_iocmd == BIO_READ) {
1495 if (bp->b_rcred == NOCRED && cred != NOCRED)
1496 bp->b_rcred = crhold(cred);
1498 if (bp->b_wcred == NOCRED && cred != NOCRED)
1499 bp->b_wcred = crhold(cred);
1502 if (bp->b_flags & B_REMFREE)
1505 TAILQ_INSERT_TAIL(&nmp->nm_bufq, bp, b_freelist);
1507 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1508 mtx_lock(&(VTONFS(bp->b_vp))->n_mtx);
1509 VTONFS(bp->b_vp)->n_flag |= NMODIFIED;
1510 VTONFS(bp->b_vp)->n_directio_asyncwr++;
1511 mtx_unlock(&(VTONFS(bp->b_vp))->n_mtx);
1513 mtx_unlock(&ncl_iod_mutex);
1517 mtx_unlock(&ncl_iod_mutex);
1520 * All the iods are busy on other mounts, so return EIO to
1521 * force the caller to process the i/o synchronously.
1523 NFS_DPF(ASYNCIO, ("ncl_asyncio: no iods available, i/o is synchronous\n"));
1528 ncl_doio_directwrite(struct buf *bp)
1530 int iomode, must_commit;
1531 struct uio *uiop = (struct uio *)bp->b_caller1;
1532 char *iov_base = uiop->uio_iov->iov_base;
1534 iomode = NFSWRITE_FILESYNC;
1535 uiop->uio_td = NULL; /* NULL since we're in nfsiod */
1536 ncl_writerpc(bp->b_vp, uiop, bp->b_wcred, &iomode, &must_commit, 0);
1537 KASSERT((must_commit == 0), ("ncl_doio_directwrite: Did not commit write"));
1538 free(iov_base, M_NFSDIRECTIO);
1539 free(uiop->uio_iov, M_NFSDIRECTIO);
1540 free(uiop, M_NFSDIRECTIO);
1541 if ((bp->b_flags & B_DIRECT) && bp->b_iocmd == BIO_WRITE) {
1542 struct nfsnode *np = VTONFS(bp->b_vp);
1543 mtx_lock(&np->n_mtx);
1544 if (NFSHASPNFS(VFSTONFS(vnode_mount(bp->b_vp)))) {
1546 * Invalidate the attribute cache, since writes to a DS
1547 * won't update the size attribute.
1549 np->n_attrstamp = 0;
1551 np->n_directio_asyncwr--;
1552 if (np->n_directio_asyncwr == 0) {
1553 np->n_flag &= ~NMODIFIED;
1554 if ((np->n_flag & NFSYNCWAIT)) {
1555 np->n_flag &= ~NFSYNCWAIT;
1556 wakeup((caddr_t)&np->n_directio_asyncwr);
1559 mtx_unlock(&np->n_mtx);
1562 relpbuf(bp, &ncl_pbuf_freecnt);
1566 * Do an I/O operation to/from a cache block. This may be called
1567 * synchronously or from an nfsiod.
1570 ncl_doio(struct vnode *vp, struct buf *bp, struct ucred *cr, struct thread *td,
1571 int called_from_strategy)
1575 struct nfsmount *nmp;
1576 int error = 0, iomode, must_commit = 0;
1579 struct proc *p = td ? td->td_proc : NULL;
1583 nmp = VFSTONFS(vp->v_mount);
1585 uiop->uio_iov = &io;
1586 uiop->uio_iovcnt = 1;
1587 uiop->uio_segflg = UIO_SYSSPACE;
1591 * clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
1592 * do this here so we do not have to do it in all the code that
1595 bp->b_flags &= ~B_INVAL;
1596 bp->b_ioflags &= ~BIO_ERROR;
1598 KASSERT(!(bp->b_flags & B_DONE), ("ncl_doio: bp %p already marked done", bp));
1599 iocmd = bp->b_iocmd;
1600 if (iocmd == BIO_READ) {
1601 io.iov_len = uiop->uio_resid = bp->b_bcount;
1602 io.iov_base = bp->b_data;
1603 uiop->uio_rw = UIO_READ;
1605 switch (vp->v_type) {
1607 uiop->uio_offset = ((off_t)bp->b_blkno) * DEV_BSIZE;
1608 NFSINCRGLOBAL(newnfsstats.read_bios);
1609 error = ncl_readrpc(vp, uiop, cr);
1612 if (uiop->uio_resid) {
1614 * If we had a short read with no error, we must have
1615 * hit a file hole. We should zero-fill the remainder.
1616 * This can also occur if the server hits the file EOF.
1618 * Holes used to be able to occur due to pending
1619 * writes, but that is not possible any longer.
1621 int nread = bp->b_bcount - uiop->uio_resid;
1622 ssize_t left = uiop->uio_resid;
1625 bzero((char *)bp->b_data + nread, left);
1626 uiop->uio_resid = 0;
1629 /* ASSERT_VOP_LOCKED(vp, "ncl_doio"); */
1630 if (p && (vp->v_vflag & VV_TEXT)) {
1631 mtx_lock(&np->n_mtx);
1632 if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &np->n_vattr.na_mtime)) {
1633 mtx_unlock(&np->n_mtx);
1635 killproc(p, "text file modification");
1638 mtx_unlock(&np->n_mtx);
1642 uiop->uio_offset = (off_t)0;
1643 NFSINCRGLOBAL(newnfsstats.readlink_bios);
1644 error = ncl_readlinkrpc(vp, uiop, cr);
1647 NFSINCRGLOBAL(newnfsstats.readdir_bios);
1648 uiop->uio_offset = ((u_quad_t)bp->b_lblkno) * NFS_DIRBLKSIZ;
1649 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) != 0) {
1650 error = ncl_readdirplusrpc(vp, uiop, cr, td);
1651 if (error == NFSERR_NOTSUPP)
1652 nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
1654 if ((nmp->nm_flag & NFSMNT_RDIRPLUS) == 0)
1655 error = ncl_readdirrpc(vp, uiop, cr, td);
1657 * end-of-directory sets B_INVAL but does not generate an
1660 if (error == 0 && uiop->uio_resid == bp->b_bcount)
1661 bp->b_flags |= B_INVAL;
1664 ncl_printf("ncl_doio: type %x unexpected\n", vp->v_type);
1668 bp->b_ioflags |= BIO_ERROR;
1669 bp->b_error = error;
1673 * If we only need to commit, try to commit
1675 if (bp->b_flags & B_NEEDCOMMIT) {
1679 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + bp->b_dirtyoff;
1680 retv = ncl_commit(vp, off, bp->b_dirtyend-bp->b_dirtyoff,
1683 bp->b_dirtyoff = bp->b_dirtyend = 0;
1684 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1689 if (retv == NFSERR_STALEWRITEVERF) {
1690 ncl_clearcommit(vp->v_mount);
1695 * Setup for actual write
1697 mtx_lock(&np->n_mtx);
1698 if ((off_t)bp->b_blkno * DEV_BSIZE + bp->b_dirtyend > np->n_size)
1699 bp->b_dirtyend = np->n_size - (off_t)bp->b_blkno * DEV_BSIZE;
1700 mtx_unlock(&np->n_mtx);
1702 if (bp->b_dirtyend > bp->b_dirtyoff) {
1703 io.iov_len = uiop->uio_resid = bp->b_dirtyend
1705 uiop->uio_offset = (off_t)bp->b_blkno * DEV_BSIZE
1707 io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
1708 uiop->uio_rw = UIO_WRITE;
1709 NFSINCRGLOBAL(newnfsstats.write_bios);
1711 if ((bp->b_flags & (B_ASYNC | B_NEEDCOMMIT | B_NOCACHE | B_CLUSTER)) == B_ASYNC)
1712 iomode = NFSWRITE_UNSTABLE;
1714 iomode = NFSWRITE_FILESYNC;
1716 error = ncl_writerpc(vp, uiop, cr, &iomode, &must_commit,
1717 called_from_strategy);
1720 * When setting B_NEEDCOMMIT also set B_CLUSTEROK to try
1721 * to cluster the buffers needing commit. This will allow
1722 * the system to submit a single commit rpc for the whole
1723 * cluster. We can do this even if the buffer is not 100%
1724 * dirty (relative to the NFS blocksize), so we optimize the
1725 * append-to-file-case.
1727 * (when clearing B_NEEDCOMMIT, B_CLUSTEROK must also be
1728 * cleared because write clustering only works for commit
1729 * rpc's, not for the data portion of the write).
1732 if (!error && iomode == NFSWRITE_UNSTABLE) {
1733 bp->b_flags |= B_NEEDCOMMIT;
1734 if (bp->b_dirtyoff == 0
1735 && bp->b_dirtyend == bp->b_bcount)
1736 bp->b_flags |= B_CLUSTEROK;
1738 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
1742 * For an interrupted write, the buffer is still valid
1743 * and the write hasn't been pushed to the server yet,
1744 * so we can't set BIO_ERROR and report the interruption
1745 * by setting B_EINTR. For the B_ASYNC case, B_EINTR
1746 * is not relevant, so the rpc attempt is essentially
1747 * a noop. For the case of a V3 write rpc not being
1748 * committed to stable storage, the block is still
1749 * dirty and requires either a commit rpc or another
1750 * write rpc with iomode == NFSV3WRITE_FILESYNC before
1751 * the block is reused. This is indicated by setting
1752 * the B_DELWRI and B_NEEDCOMMIT flags.
1754 * EIO is returned by ncl_writerpc() to indicate a recoverable
1755 * write error and is handled as above, except that
1756 * B_EINTR isn't set. One cause of this is a stale stateid
1757 * error for the RPC that indicates recovery is required,
1758 * when called with called_from_strategy != 0.
1760 * If the buffer is marked B_PAGING, it does not reside on
1761 * the vp's paging queues so we cannot call bdirty(). The
1762 * bp in this case is not an NFS cache block so we should
1765 * The logic below breaks up errors into recoverable and
1766 * unrecoverable. For the former, we clear B_INVAL|B_NOCACHE
1767 * and keep the buffer around for potential write retries.
1768 * For the latter (eg ESTALE), we toss the buffer away (B_INVAL)
1769 * and save the error in the nfsnode. This is less than ideal
1770 * but necessary. Keeping such buffers around could potentially
1771 * cause buffer exhaustion eventually (they can never be written
1772 * out, so will get constantly be re-dirtied). It also causes
1773 * all sorts of vfs panics. For non-recoverable write errors,
1774 * also invalidate the attrcache, so we'll be forced to go over
1775 * the wire for this object, returning an error to user on next
1776 * call (most of the time).
1778 if (error == EINTR || error == EIO || error == ETIMEDOUT
1779 || (!error && (bp->b_flags & B_NEEDCOMMIT))) {
1783 bp->b_flags &= ~(B_INVAL|B_NOCACHE);
1784 if ((bp->b_flags & B_PAGING) == 0) {
1786 bp->b_flags &= ~B_DONE;
1788 if ((error == EINTR || error == ETIMEDOUT) &&
1789 (bp->b_flags & B_ASYNC) == 0)
1790 bp->b_flags |= B_EINTR;
1794 bp->b_ioflags |= BIO_ERROR;
1795 bp->b_flags |= B_INVAL;
1796 bp->b_error = np->n_error = error;
1797 mtx_lock(&np->n_mtx);
1798 np->n_flag |= NWRITEERR;
1799 np->n_attrstamp = 0;
1800 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
1801 mtx_unlock(&np->n_mtx);
1803 bp->b_dirtyoff = bp->b_dirtyend = 0;
1811 bp->b_resid = uiop->uio_resid;
1813 ncl_clearcommit(vp->v_mount);
1819 * Used to aid in handling ftruncate() operations on the NFS client side.
1820 * Truncation creates a number of special problems for NFS. We have to
1821 * throw away VM pages and buffer cache buffers that are beyond EOF, and
1822 * we have to properly handle VM pages or (potentially dirty) buffers
1823 * that straddle the truncation point.
1827 ncl_meta_setsize(struct vnode *vp, struct ucred *cred, struct thread *td, u_quad_t nsize)
1829 struct nfsnode *np = VTONFS(vp);
1831 int biosize = vp->v_bufobj.bo_bsize;
1834 mtx_lock(&np->n_mtx);
1837 mtx_unlock(&np->n_mtx);
1839 if (nsize < tsize) {
1845 * vtruncbuf() doesn't get the buffer overlapping the
1846 * truncation point. We may have a B_DELWRI and/or B_CACHE
1847 * buffer that now needs to be truncated.
1849 error = vtruncbuf(vp, cred, nsize, biosize);
1850 lbn = nsize / biosize;
1851 bufsize = nsize - (lbn * biosize);
1852 bp = nfs_getcacheblk(vp, lbn, bufsize, td);
1855 if (bp->b_dirtyoff > bp->b_bcount)
1856 bp->b_dirtyoff = bp->b_bcount;
1857 if (bp->b_dirtyend > bp->b_bcount)
1858 bp->b_dirtyend = bp->b_bcount;
1859 bp->b_flags |= B_RELBUF; /* don't leave garbage around */
1862 vnode_pager_setsize(vp, nsize);