From 483691f36307be815003a40825b00bbd9bcb21d3 Mon Sep 17 00:00:00 2001
From: Josef Bacik <josef@redhat.com>
Date: Tue, 1 Feb 2011 15:52:47 -0800
Subject: [PATCH] --- yaml --- r: 232738 b: refs/heads/master c:
 d54cdc8ca7aabc69e145a62155855db42b04ed0b h: refs/heads/master v: v3

---
 [refs]           | 2 +-
 trunk/fs/ioctl.c | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index c5ba8d9b2a73..c42004794c85 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3cd90ea42f2c15f928b70ed66f6d8ed0a8e7aadd
+refs/heads/master: d54cdc8ca7aabc69e145a62155855db42b04ed0b
diff --git a/trunk/fs/ioctl.c b/trunk/fs/ioctl.c
index a59635e295fa..1eebeb72b202 100644
--- a/trunk/fs/ioctl.c
+++ b/trunk/fs/ioctl.c
@@ -273,6 +273,13 @@ int __generic_block_fiemap(struct inode *inode,
 		len = isize;
 	}
 
+	/*
+	 * Some filesystems can't deal with being asked to map less than
+	 * blocksize, so make sure our len is at least block length.
+	 */
+	if (logical_to_blk(inode, len) == 0)
+		len = blk_to_logical(inode, 1);
+
 	start_blk = logical_to_blk(inode, start);
 	last_blk = logical_to_blk(inode, start + len - 1);