From 105f2cc28ecd92eea671af9f34066dedbaac104b Mon Sep 17 00:00:00 2001
From: Nathan Scott <nathans@sgi.com>
Date: Fri, 17 Sep 2004 06:40:22 +0000
Subject: [PATCH] Fix xfs_io request size handling botch in alloc_buffer when
 going from larger to smaller request sizes. Merge of
 xfs-cmds-melb:slinx:19497a by kenmcd.

---
 io/pread.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/io/pread.c b/io/pread.c
index ed0d20e6c..47ae5cf01 100644
--- a/io/pread.c
+++ b/io/pread.c
@@ -57,6 +57,7 @@ pread_help(void)
 }
 
 void	*buffer;
+ssize_t	highwater;
 ssize_t	buffersize;
 
 int
@@ -65,16 +66,18 @@ alloc_buffer(
 	int		uflag,
 	unsigned int	seed)
 {
-	if (bsize > buffersize) {
+	if (bsize > highwater) {
 		if (buffer)
 			free(buffer);
-		buffer = memalign(pagesize, buffersize = bsize);
+		buffer = memalign(pagesize, bsize);
 		if (!buffer) {
 			perror("memalign");
-			buffersize = 0;
+			highwater = buffersize = 0;
 			return -1;
 		}
+		highwater = bsize;
 	}
+	buffersize = bsize;
 	if (!uflag)
 		memset(buffer, seed, buffersize);
 	return 0;
-- 
2.47.2