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+/*
+ * Copyright (c) 1989 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Rick Macklem at The University of Guelph.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * From: @(#)nfs_bio.c 7.19 (Berkeley) 4/16/91
+ * $Id: nfs_bio.c,v 1.3 1993/09/09 22:06:00 rgrimes Exp $
+ */
+
+#include "param.h"
+#include "systm.h"
+#include "proc.h"
+#include "buf.h"
+#include "uio.h"
+#include "namei.h"
+#include "vnode.h"
+#include "trace.h"
+#include "mount.h"
+#include "resourcevar.h"
+#ifdef PROTOTYPESDONE
+#include "vm/vnode_pager.h"
+#endif /*PROTOTYPESDONE*/
+
+#include "nfsnode.h"
+#include "nfsv2.h"
+#include "nfs.h"
+#include "nfsiom.h"
+#include "nfsmount.h"
+
+/* True and false, how exciting */
+#define TRUE 1
+#define FALSE 0
+
+/*
+ * Vnode op for read using bio
+ * Any similarity to readip() is purely coincidental
+ */
+int
+nfs_bioread(vp, uio, ioflag, cred)
+ register struct vnode *vp;
+ register struct uio *uio;
+ int ioflag;
+ struct ucred *cred;
+{
+ register struct nfsnode *np = VTONFS(vp);
+ register int biosize;
+ struct buf *bp;
+ struct vattr vattr;
+ daddr_t lbn, bn, rablock;
+ int diff, error = 0;
+ long n = 0, on = 0;
+
+#ifdef lint
+ ioflag = ioflag;
+#endif /* lint */
+#ifdef DIAGNOSTIC
+ if (uio->uio_rw != UIO_READ)
+ panic("nfs_read mode");
+#endif
+ if (uio->uio_resid == 0)
+ return (0);
+ if (uio->uio_offset < 0 && vp->v_type != VDIR)
+ return (EINVAL);
+ biosize = VFSTONFS(vp->v_mount)->nm_rsize;
+ /*
+ * If the file's modify time on the server has changed since the
+ * last read rpc or you have written to the file,
+ * you may have lost data cache consistency with the
+ * server, so flush all of the file's data out of the cache.
+ * Then force a getattr rpc to ensure that you have up to date
+ * attributes.
+ * NB: This implies that cache data can be read when up to
+ * NFS_ATTRTIMEO seconds out of date. If you find that you need current
+ * attributes this could be forced by setting n_attrstamp to 0 before
+ * the nfs_dogetattr() call.
+ */
+ if (vp->v_type != VLNK) {
+ if (np->n_flag & NMODIFIED) {
+ np->n_flag &= ~NMODIFIED;
+ vinvalbuf(vp, TRUE);
+ np->n_attrstamp = 0;
+ np->n_direofoffset = 0;
+ if (error = nfs_dogetattr(vp, &vattr, cred, 1,
+ uio->uio_procp))
+ return (error);
+ np->n_mtime = vattr.va_mtime.tv_sec;
+ } else {
+ if (error = nfs_dogetattr(vp, &vattr, cred, 1,
+ uio->uio_procp))
+ return (error);
+ if (np->n_mtime != vattr.va_mtime.tv_sec) {
+ np->n_direofoffset = 0;
+ vinvalbuf(vp, TRUE);
+ np->n_mtime = vattr.va_mtime.tv_sec;
+ }
+ }
+ }
+ do {
+ switch (vp->v_type) {
+ case VREG:
+ nfsstats.biocache_reads++;
+ lbn = uio->uio_offset / biosize;
+ on = uio->uio_offset & (biosize-1);
+ n = MIN((unsigned)(biosize - on), uio->uio_resid);
+ diff = np->n_size - uio->uio_offset;
+ if (diff <= 0)
+ return (error);
+ if (diff < n)
+ n = diff;
+ bn = lbn*(biosize/DEV_BSIZE);
+ rablock = (lbn+1)*(biosize/DEV_BSIZE);
+ if (vp->v_lastr + 1 == lbn &&
+ np->n_size > (rablock * DEV_BSIZE))
+ error = breada(vp, bn, biosize, rablock, biosize,
+ cred, &bp);
+ else
+ error = bread(vp, bn, biosize, cred, &bp);
+ vp->v_lastr = lbn;
+ if (bp->b_resid) {
+ diff = (on >= (biosize-bp->b_resid)) ? 0 :
+ (biosize-bp->b_resid-on);
+ n = MIN(n, diff);
+ }
+ break;
+ case VLNK:
+ nfsstats.biocache_readlinks++;
+ on = 0;
+ error = bread(vp, (daddr_t)0, NFS_MAXPATHLEN, cred, &bp);
+ n = MIN(uio->uio_resid, NFS_MAXPATHLEN - bp->b_resid);
+ break;
+ case VDIR:
+ nfsstats.biocache_readdirs++;
+ on = 0;
+ error = bread(vp, uio->uio_offset, NFS_DIRBLKSIZ, cred, &bp);
+ n = MIN(uio->uio_resid, NFS_DIRBLKSIZ - bp->b_resid);
+ break;
+ default:
+ ;
+ };
+ if (error) {
+ brelse(bp);
+ return (error);
+ }
+ if (n > 0)
+ error = uiomove(bp->b_un.b_addr + on, (int)n, uio);
+ switch (vp->v_type) {
+ case VREG:
+ if (n+on == biosize || uio->uio_offset == np->n_size)
+ bp->b_flags |= B_AGE;
+ break;
+ case VLNK:
+ n = 0;
+ break;
+ case VDIR:
+ uio->uio_offset = bp->b_blkno;
+ break;
+ default:
+ ;
+ };
+ brelse(bp);
+ } while (error == 0 && uio->uio_resid > 0 && n != 0);
+ return (error);
+}
+
+/*
+ * Vnode op for write using bio
+ */
+int
+nfs_write(vp, uio, ioflag, cred)
+ register struct vnode *vp;
+ register struct uio *uio;
+ int ioflag;
+ struct ucred *cred;
+{
+ struct proc *p = uio->uio_procp;
+ register int biosize;
+ struct buf *bp;
+ struct nfsnode *np = VTONFS(vp);
+ struct vattr vattr;
+ daddr_t lbn, bn;
+ int n, on, error = 0;
+
+#ifdef DIAGNOSTIC
+ if (uio->uio_rw != UIO_WRITE)
+ panic("nfs_write mode");
+ if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
+ panic("nfs_write proc");
+#endif
+ if (vp->v_type != VREG)
+ return (EIO);
+ /* Should we try and do this ?? */
+ if (ioflag & (IO_APPEND | IO_SYNC)) {
+ if (np->n_flag & NMODIFIED) {
+ np->n_flag &= ~NMODIFIED;
+ vinvalbuf(vp, TRUE);
+ }
+ if (ioflag & IO_APPEND) {
+ np->n_attrstamp = 0;
+ if (error = nfs_dogetattr(vp, &vattr, cred, 1, p))
+ return (error);
+ uio->uio_offset = np->n_size;
+ }
+ return (nfs_writerpc(vp, uio, cred));
+ }
+#ifdef notdef
+ cnt = uio->uio_resid;
+ osize = np->n_size;
+#endif
+ if (uio->uio_offset < 0)
+ return (EINVAL);
+ if (uio->uio_resid == 0)
+ return (0);
+ /*
+ * Maybe this should be above the vnode op call, but so long as
+ * file servers have no limits, i don't think it matters
+ */
+ if (uio->uio_offset + uio->uio_resid >
+ p->p_rlimit[RLIMIT_FSIZE].rlim_cur) {
+ psignal(p, SIGXFSZ);
+ return (EFBIG);
+ }
+ /*
+ * I use nm_rsize, not nm_wsize so that all buffer cache blocks
+ * will be the same size within a filesystem. nfs_writerpc will
+ * still use nm_wsize when sizing the rpc's.
+ */
+ biosize = VFSTONFS(vp->v_mount)->nm_rsize;
+ np->n_flag |= NMODIFIED;
+ vnode_pager_uncache(vp);
+ do {
+ nfsstats.biocache_writes++;
+ lbn = uio->uio_offset / biosize;
+ on = uio->uio_offset & (biosize-1);
+ n = MIN((unsigned)(biosize - on), uio->uio_resid);
+ if (uio->uio_offset+n > np->n_size) {
+ np->n_size = uio->uio_offset+n;
+ vnode_pager_setsize(vp, np->n_size);
+ }
+ bn = lbn*(biosize/DEV_BSIZE);
+again:
+ bp = getblk(vp, bn, biosize);
+ if (bp->b_wcred == NOCRED) {
+ crhold(cred);
+ bp->b_wcred = cred;
+ }
+ if (bp->b_dirtyend > 0) {
+ /*
+ * If the new write will leave a contiguous dirty
+ * area, just update the b_dirtyoff and b_dirtyend,
+ * otherwise force a write rpc of the old dirty area.
+ */
+ if (on <= bp->b_dirtyend && (on+n) >= bp->b_dirtyoff) {
+ bp->b_dirtyoff = MIN(on, bp->b_dirtyoff);
+ bp->b_dirtyend = MAX((on+n), bp->b_dirtyend);
+ } else {
+ bp->b_proc = p;
+ if (error = bwrite(bp))
+ return (error);
+ goto again;
+ }
+ } else {
+ bp->b_dirtyoff = on;
+ bp->b_dirtyend = on+n;
+ }
+ if (error = uiomove(bp->b_un.b_addr + on, n, uio)) {
+ brelse(bp);
+ return (error);
+ }
+ if ((n+on) == biosize) {
+ bp->b_flags |= B_AGE;
+ bp->b_proc = (struct proc *)0;
+ bawrite(bp);
+ } else {
+ bp->b_proc = (struct proc *)0;
+ bdwrite(bp);
+ }
+ } while (error == 0 && uio->uio_resid > 0 && n != 0);
+#ifdef notdef
+ /* Should we try and do this for nfs ?? */
+ if (error && (ioflag & IO_UNIT)) {
+ np->n_size = osize;
+ uio->uio_offset -= cnt - uio->uio_resid;
+ uio->uio_resid = cnt;
+ }
+#endif
+ return (error);
+}
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