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Date:	Mon, 26 Oct 2009 18:24:28 +0100
From:	Mike Hommey <>
To:	Alexander Viro <>
Cc:	Linus Torvalds <>,
Subject: [PATCH] Fix generic_block_fiemap for files bigger than 4GB

Because of an integer overflow on start_blk, various kind of wrong results
would be returned by the generic_block_fiemap handler, such as no extents
when there is a 4GB+ hole at the beginning of the file, or wrong fe_logical
when an extent starts after the first 4GB.

Signed-off-by: Mike Hommey <>
 fs/ioctl.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/ioctl.c b/fs/ioctl.c
index 7b17a14..6c75110 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -254,7 +254,7 @@ int __generic_block_fiemap(struct inode *inode,
 			   u64 len, get_block_t *get_block)
 	struct buffer_head tmp;
-	unsigned int start_blk;
+	unsigned long long start_blk;
 	long long length = 0, map_len = 0;
 	u64 logical = 0, phys = 0, size = 0;

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