From e48fbf26e8940e6273461aaa13820ead71d7243c Mon Sep 17 00:00:00 2001
From: Jaakko Heinonen <jh@FreeBSD.org>
Date: Fri, 22 Jan 2010 08:45:12 +0000
Subject: [PATCH] Truncate read request rather than returning EIO if the
 request is larger than MAXPHYS + 1. This fixes a problem with cat(1) when it
 uses a large I/O buffer.
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Reported by:	Fernando Apesteguía
Suggested by:	jilles
Reviewed by:	des
Approved by:	trasz (mentor)
---
 sys/fs/pseudofs/pseudofs_vnops.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/sys/fs/pseudofs/pseudofs_vnops.c b/sys/fs/pseudofs/pseudofs_vnops.c
index 34ca500c985..5854378336c 100644
--- a/sys/fs/pseudofs/pseudofs_vnops.c
+++ b/sys/fs/pseudofs/pseudofs_vnops.c
@@ -637,10 +637,8 @@ pfs_read(struct vop_read_args *va)
 		error = EINVAL;
 		goto ret;
 	}
-	if (buflen > MAXPHYS + 1) {
-		error = EIO;
-		goto ret;
-	}
+	if (buflen > MAXPHYS + 1)
+		buflen = MAXPHYS + 1;
 
 	sb = sbuf_new(sb, NULL, buflen, 0);
 	if (sb == NULL) {