From 7c1c33a7dd16e123fb836b48b7318eca0026d75e Mon Sep 17 00:00:00 2001
From: Peter Wemm <peter@FreeBSD.org>
Date: Sat, 30 May 1998 16:33:58 +0000
Subject: When using NFSv3, use the remote server's idea of the maximum file
 size rather than assuming 2^64.  It may not like files that big. :-) On the
 nfs server, calculate and report the max file size as the point that the
 block numbers in the cache would turn negative. (ie: 1099511627775 bytes
 (1TB)).

One of the things I'm worried about however, is that directory offsets
are really cookies on a NFSv3 server and can be rather large, especially
when/if the server generates the opaque directory cookies by using a local
filesystem offset in what comes out as the upper 32 bits of the 64 bit
cookie.  (a server is free to do this, it could save byte swapping
depending on the native 64 bit byte order)

Obtained from:	NetBSD
---
 sys/nfs/nfs_bio.c          |  9 +++++++--
 sys/nfs/nfs_serv.c         | 18 ++++++++++++------
 sys/nfs/nfs_vfsops.c       | 15 ++++++++++++++-
 sys/nfs/nfs_vnops.c        |  6 +++---
 sys/nfs/nfsmount.h         |  3 ++-
 sys/nfsclient/nfs_bio.c    |  9 +++++++--
 sys/nfsclient/nfs_vfsops.c | 15 ++++++++++++++-
 sys/nfsclient/nfs_vnops.c  |  6 +++---
 sys/nfsclient/nfsmount.h   |  3 ++-
 sys/nfsserver/nfs_serv.c   | 18 ++++++++++++------
 10 files changed, 76 insertions(+), 26 deletions(-)

diff --git a/sys/nfs/nfs_bio.c b/sys/nfs/nfs_bio.c
index d16bf1afc0fe..d98bc7f97d42 100644
--- a/sys/nfs/nfs_bio.c
+++ b/sys/nfs/nfs_bio.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_bio.c	8.9 (Berkeley) 3/30/95
- * $Id: nfs_bio.c,v 1.55 1998/05/19 07:11:22 peter Exp $
+ * $Id: nfs_bio.c,v 1.56 1998/05/20 08:02:23 peter Exp $
  */
 
 
@@ -254,12 +254,15 @@ nfs_bioread(vp, uio, ioflag, cred, getpages)
 #endif
 	if (uio->uio_resid == 0)
 		return (0);
-	if (uio->uio_offset < 0)
+	if (uio->uio_offset < 0)	/* XXX VDIR cookies can be negative */
 		return (EINVAL);
 	p = uio->uio_procp;
 	if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
 	    (nmp->nm_state & NFSSTA_GOTFSINFO) == 0)
 		(void)nfs_fsinfo(nmp, vp, cred, p);
+	if (vp->v_type != VDIR &&
+	    (uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
+		return (EFBIG);
 	biosize = vp->v_mount->mnt_stat.f_iosize;
 	/*
 	 * For nfs, cache consistency can only be maintained approximately.
@@ -657,6 +660,8 @@ nfs_write(ap)
 	}
 	if (uio->uio_offset < 0)
 		return (EINVAL);
+	if ((uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
+		return (EFBIG);
 	if (uio->uio_resid == 0)
 		return (0);
 	/*
diff --git a/sys/nfs/nfs_serv.c b/sys/nfs/nfs_serv.c
index bfae28d5ebc1..4b08bc699afd 100644
--- a/sys/nfs/nfs_serv.c
+++ b/sys/nfs/nfs_serv.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_serv.c	8.3 (Berkeley) 1/12/94
- * $Id: nfs_serv.c,v 1.60 1998/05/07 04:58:51 msmith Exp $
+ * $Id: nfs_serv.c,v 1.61 1998/05/20 09:05:48 peter Exp $
  */
 
 /*
@@ -3256,19 +3256,26 @@ nfsrv_fsinfo(nfsd, slp, procp, mrq)
 	struct vattr at;
 	nfsfh_t nfh;
 	fhandle_t *fhp;
-	u_quad_t frev;
+	u_quad_t frev, maxfsize;
+	struct statfs sb;
 
 #ifndef nolint
 	cache = 0;
 #endif
 	fhp = &nfh.fh_generic;
 	nfsm_srvmtofh(fhp);
-	if (error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
-		 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE)) {
+	error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
+		 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
+	if (error) {
 		nfsm_reply(NFSX_UNSIGNED);
 		nfsm_srvpostop_attr(getret, &at);
 		return (0);
 	}
+
+	/* XXX Try to make a guess on the max file size. */
+	VFS_STATFS(vp->v_mount, &sb, procp);
+	maxfsize = (u_quad_t)0x80000000 * sb.f_bsize - 1;
+
 	getret = VOP_GETATTR(vp, &at, cred, procp);
 	vput(vp);
 	nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3FSINFO);
@@ -3291,8 +3298,7 @@ nfsrv_fsinfo(nfsd, slp, procp, mrq)
 	sip->fs_wtpref = txdr_unsigned(pref);
 	sip->fs_wtmult = txdr_unsigned(NFS_FABLKSIZE);
 	sip->fs_dtpref = txdr_unsigned(pref);
-	sip->fs_maxfilesize.nfsuquad[0] = 0xffffffff;
-	sip->fs_maxfilesize.nfsuquad[1] = 0xffffffff;
+	txdr_hyper(&maxfsize, &sip->fs_maxfilesize);
 	sip->fs_timedelta.nfsv3_sec = 0;
 	sip->fs_timedelta.nfsv3_nsec = txdr_unsigned(1);
 	sip->fs_properties = txdr_unsigned(NFSV3FSINFO_LINK |
diff --git a/sys/nfs/nfs_vfsops.c b/sys/nfs/nfs_vfsops.c
index 729ccbac00b3..554b0ef9a9ba 100644
--- a/sys/nfs/nfs_vfsops.c
+++ b/sys/nfs/nfs_vfsops.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_vfsops.c	8.12 (Berkeley) 5/20/95
- * $Id: nfs_vfsops.c,v 1.62 1998/05/20 08:05:45 peter Exp $
+ * $Id: nfs_vfsops.c,v 1.63 1998/05/24 14:41:56 peter Exp $
  */
 
 #include <sys/param.h>
@@ -333,6 +333,7 @@ nfs_fsinfo(nmp, vp, cred, p)
 	caddr_t bpos, dpos, cp2;
 	int error = 0, retattr;
 	struct mbuf *mreq, *mrep, *md, *mb, *mb2;
+	u_int64_t maxfsize;
 
 	nfsstats.rpccnt[NFSPROC_FSINFO]++;
 	nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
@@ -367,6 +368,11 @@ nfs_fsinfo(nmp, vp, cred, p)
 		if (max < nmp->nm_readdirsize) {
 			nmp->nm_readdirsize = max;
 		}
+		/* XXX */
+		nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
+		fxdr_hyper(&fsp->fs_maxfilesize, &maxfsize);
+		if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
+			nmp->nm_maxfilesize = maxfsize;
 		nmp->nm_state |= NFSSTA_GOTFSINFO;
 	}
 	nfsm_reqdone;
@@ -690,6 +696,13 @@ mountnfs(argp, mp, nam, pth, hst, vpp)
 		 * unsuspecting binaries).
 		 */
 		mp->mnt_maxsymlinklen = 1;
+	if ((argp->flags & NFSMNT_NFSV3) == 0)
+		/*
+		 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo
+		 * will fill this in.
+		 */
+		nmp->nm_maxfilesize = 0xffffffffLL;
+
 	nmp->nm_timeo = NFS_TIMEO;
 	nmp->nm_retry = NFS_RETRANS;
 	nmp->nm_wsize = NFS_WSIZE;
diff --git a/sys/nfs/nfs_vnops.c b/sys/nfs/nfs_vnops.c
index 246757f2d2ab..dc8629d20358 100644
--- a/sys/nfs/nfs_vnops.c
+++ b/sys/nfs/nfs_vnops.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_vnops.c	8.16 (Berkeley) 5/27/95
- * $Id: nfs_vnops.c,v 1.88 1998/05/16 16:20:50 bde Exp $
+ * $Id: nfs_vnops.c,v 1.89 1998/05/19 07:11:26 peter Exp $
  */
 
 
@@ -1029,7 +1029,7 @@ nfs_readrpc(vp, uiop, cred)
 #endif
 	nmp = VFSTONFS(vp->v_mount);
 	tsiz = uiop->uio_resid;
-	if (uiop->uio_offset + tsiz > 0xffffffff && !v3)
+	if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
 		return (EFBIG);
 	while (tsiz > 0) {
 		nfsstats.rpccnt[NFSPROC_READ]++;
@@ -1095,7 +1095,7 @@ nfs_writerpc(vp, uiop, cred, iomode, must_commit)
 #endif
 	*must_commit = 0;
 	tsiz = uiop->uio_resid;
-	if (uiop->uio_offset + tsiz > 0xffffffff && !v3)
+	if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
 		return (EFBIG);
 	while (tsiz > 0) {
 		nfsstats.rpccnt[NFSPROC_WRITE]++;
diff --git a/sys/nfs/nfsmount.h b/sys/nfs/nfsmount.h
index 2d502bdd4ace..ecb4f058d52a 100644
--- a/sys/nfs/nfsmount.h
+++ b/sys/nfs/nfsmount.h
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfsmount.h	8.3 (Berkeley) 3/30/95
- * $Id: nfsmount.h,v 1.13 1997/08/16 19:16:05 wollman Exp $
+ * $Id: nfsmount.h,v 1.14 1998/05/19 07:11:27 peter Exp $
  */
 
 
@@ -92,6 +92,7 @@ struct	nfsmount {
 	short	nm_bufqlen;		/* number of buffers in queue */
 	short	nm_bufqwant;		/* process wants to add to the queue */
 	int	nm_bufqiods;		/* number of iods processing queue */
+	u_int64_t nm_maxfilesize;	/* maximum file size */
 };
 
 #if defined(KERNEL) || defined(_KERNEL)
diff --git a/sys/nfsclient/nfs_bio.c b/sys/nfsclient/nfs_bio.c
index d16bf1afc0fe..d98bc7f97d42 100644
--- a/sys/nfsclient/nfs_bio.c
+++ b/sys/nfsclient/nfs_bio.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_bio.c	8.9 (Berkeley) 3/30/95
- * $Id: nfs_bio.c,v 1.55 1998/05/19 07:11:22 peter Exp $
+ * $Id: nfs_bio.c,v 1.56 1998/05/20 08:02:23 peter Exp $
  */
 
 
@@ -254,12 +254,15 @@ nfs_bioread(vp, uio, ioflag, cred, getpages)
 #endif
 	if (uio->uio_resid == 0)
 		return (0);
-	if (uio->uio_offset < 0)
+	if (uio->uio_offset < 0)	/* XXX VDIR cookies can be negative */
 		return (EINVAL);
 	p = uio->uio_procp;
 	if ((nmp->nm_flag & NFSMNT_NFSV3) != 0 &&
 	    (nmp->nm_state & NFSSTA_GOTFSINFO) == 0)
 		(void)nfs_fsinfo(nmp, vp, cred, p);
+	if (vp->v_type != VDIR &&
+	    (uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
+		return (EFBIG);
 	biosize = vp->v_mount->mnt_stat.f_iosize;
 	/*
 	 * For nfs, cache consistency can only be maintained approximately.
@@ -657,6 +660,8 @@ nfs_write(ap)
 	}
 	if (uio->uio_offset < 0)
 		return (EINVAL);
+	if ((uio->uio_offset + uio->uio_resid) > nmp->nm_maxfilesize)
+		return (EFBIG);
 	if (uio->uio_resid == 0)
 		return (0);
 	/*
diff --git a/sys/nfsclient/nfs_vfsops.c b/sys/nfsclient/nfs_vfsops.c
index 729ccbac00b3..554b0ef9a9ba 100644
--- a/sys/nfsclient/nfs_vfsops.c
+++ b/sys/nfsclient/nfs_vfsops.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_vfsops.c	8.12 (Berkeley) 5/20/95
- * $Id: nfs_vfsops.c,v 1.62 1998/05/20 08:05:45 peter Exp $
+ * $Id: nfs_vfsops.c,v 1.63 1998/05/24 14:41:56 peter Exp $
  */
 
 #include <sys/param.h>
@@ -333,6 +333,7 @@ nfs_fsinfo(nmp, vp, cred, p)
 	caddr_t bpos, dpos, cp2;
 	int error = 0, retattr;
 	struct mbuf *mreq, *mrep, *md, *mb, *mb2;
+	u_int64_t maxfsize;
 
 	nfsstats.rpccnt[NFSPROC_FSINFO]++;
 	nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
@@ -367,6 +368,11 @@ nfs_fsinfo(nmp, vp, cred, p)
 		if (max < nmp->nm_readdirsize) {
 			nmp->nm_readdirsize = max;
 		}
+		/* XXX */
+		nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
+		fxdr_hyper(&fsp->fs_maxfilesize, &maxfsize);
+		if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
+			nmp->nm_maxfilesize = maxfsize;
 		nmp->nm_state |= NFSSTA_GOTFSINFO;
 	}
 	nfsm_reqdone;
@@ -690,6 +696,13 @@ mountnfs(argp, mp, nam, pth, hst, vpp)
 		 * unsuspecting binaries).
 		 */
 		mp->mnt_maxsymlinklen = 1;
+	if ((argp->flags & NFSMNT_NFSV3) == 0)
+		/*
+		 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo
+		 * will fill this in.
+		 */
+		nmp->nm_maxfilesize = 0xffffffffLL;
+
 	nmp->nm_timeo = NFS_TIMEO;
 	nmp->nm_retry = NFS_RETRANS;
 	nmp->nm_wsize = NFS_WSIZE;
diff --git a/sys/nfsclient/nfs_vnops.c b/sys/nfsclient/nfs_vnops.c
index 246757f2d2ab..dc8629d20358 100644
--- a/sys/nfsclient/nfs_vnops.c
+++ b/sys/nfsclient/nfs_vnops.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_vnops.c	8.16 (Berkeley) 5/27/95
- * $Id: nfs_vnops.c,v 1.88 1998/05/16 16:20:50 bde Exp $
+ * $Id: nfs_vnops.c,v 1.89 1998/05/19 07:11:26 peter Exp $
  */
 
 
@@ -1029,7 +1029,7 @@ nfs_readrpc(vp, uiop, cred)
 #endif
 	nmp = VFSTONFS(vp->v_mount);
 	tsiz = uiop->uio_resid;
-	if (uiop->uio_offset + tsiz > 0xffffffff && !v3)
+	if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
 		return (EFBIG);
 	while (tsiz > 0) {
 		nfsstats.rpccnt[NFSPROC_READ]++;
@@ -1095,7 +1095,7 @@ nfs_writerpc(vp, uiop, cred, iomode, must_commit)
 #endif
 	*must_commit = 0;
 	tsiz = uiop->uio_resid;
-	if (uiop->uio_offset + tsiz > 0xffffffff && !v3)
+	if (uiop->uio_offset + tsiz > nmp->nm_maxfilesize)
 		return (EFBIG);
 	while (tsiz > 0) {
 		nfsstats.rpccnt[NFSPROC_WRITE]++;
diff --git a/sys/nfsclient/nfsmount.h b/sys/nfsclient/nfsmount.h
index 2d502bdd4ace..ecb4f058d52a 100644
--- a/sys/nfsclient/nfsmount.h
+++ b/sys/nfsclient/nfsmount.h
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfsmount.h	8.3 (Berkeley) 3/30/95
- * $Id: nfsmount.h,v 1.13 1997/08/16 19:16:05 wollman Exp $
+ * $Id: nfsmount.h,v 1.14 1998/05/19 07:11:27 peter Exp $
  */
 
 
@@ -92,6 +92,7 @@ struct	nfsmount {
 	short	nm_bufqlen;		/* number of buffers in queue */
 	short	nm_bufqwant;		/* process wants to add to the queue */
 	int	nm_bufqiods;		/* number of iods processing queue */
+	u_int64_t nm_maxfilesize;	/* maximum file size */
 };
 
 #if defined(KERNEL) || defined(_KERNEL)
diff --git a/sys/nfsserver/nfs_serv.c b/sys/nfsserver/nfs_serv.c
index bfae28d5ebc1..4b08bc699afd 100644
--- a/sys/nfsserver/nfs_serv.c
+++ b/sys/nfsserver/nfs_serv.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_serv.c	8.3 (Berkeley) 1/12/94
- * $Id: nfs_serv.c,v 1.60 1998/05/07 04:58:51 msmith Exp $
+ * $Id: nfs_serv.c,v 1.61 1998/05/20 09:05:48 peter Exp $
  */
 
 /*
@@ -3256,19 +3256,26 @@ nfsrv_fsinfo(nfsd, slp, procp, mrq)
 	struct vattr at;
 	nfsfh_t nfh;
 	fhandle_t *fhp;
-	u_quad_t frev;
+	u_quad_t frev, maxfsize;
+	struct statfs sb;
 
 #ifndef nolint
 	cache = 0;
 #endif
 	fhp = &nfh.fh_generic;
 	nfsm_srvmtofh(fhp);
-	if (error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
-		 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE)) {
+	error = nfsrv_fhtovp(fhp, 1, &vp, cred, slp, nam,
+		 &rdonly, (nfsd->nd_flag & ND_KERBAUTH), TRUE);
+	if (error) {
 		nfsm_reply(NFSX_UNSIGNED);
 		nfsm_srvpostop_attr(getret, &at);
 		return (0);
 	}
+
+	/* XXX Try to make a guess on the max file size. */
+	VFS_STATFS(vp->v_mount, &sb, procp);
+	maxfsize = (u_quad_t)0x80000000 * sb.f_bsize - 1;
+
 	getret = VOP_GETATTR(vp, &at, cred, procp);
 	vput(vp);
 	nfsm_reply(NFSX_V3POSTOPATTR + NFSX_V3FSINFO);
@@ -3291,8 +3298,7 @@ nfsrv_fsinfo(nfsd, slp, procp, mrq)
 	sip->fs_wtpref = txdr_unsigned(pref);
 	sip->fs_wtmult = txdr_unsigned(NFS_FABLKSIZE);
 	sip->fs_dtpref = txdr_unsigned(pref);
-	sip->fs_maxfilesize.nfsuquad[0] = 0xffffffff;
-	sip->fs_maxfilesize.nfsuquad[1] = 0xffffffff;
+	txdr_hyper(&maxfsize, &sip->fs_maxfilesize);
 	sip->fs_timedelta.nfsv3_sec = 0;
 	sip->fs_timedelta.nfsv3_nsec = txdr_unsigned(1);
 	sip->fs_properties = txdr_unsigned(NFSV3FSINFO_LINK |
-- 
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