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Date:	Tue, 15 Feb 2011 16:13:07 -0800
From:	Greg KH <>
	Lukas Czerner <>, Jan Kara <>,
	"Theodore Tso" <>
Subject: [130/272] ext4: fix trimming of a single group

2.6.37-stable review patch.  If anyone has any objections, please let us know.


From: Jan Kara <>

commit ca6e909f9bebe709bc65a3ee605ce32969db0452 upstream.

When ext4_trim_fs() is called to trim a part of a single group, the
logic will wrongly set last block of the interval to 'len' instead
of 'first_block + len'. Thus a shorter interval is possibly trimmed.
Fix it.

CC: Lukas Czerner <>
Signed-off-by: Jan Kara <>
Signed-off-by: "Theodore Ts'o" <>
Signed-off-by: Greg Kroah-Hartman <>

 fs/ext4/mballoc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4851,7 +4851,7 @@ int ext4_trim_fs(struct super_block *sb,
 		if (len >= EXT4_BLOCKS_PER_GROUP(sb))
 			len -= (EXT4_BLOCKS_PER_GROUP(sb) - first_block);
-			last_block = len;
+			last_block = first_block + len;
 		if (e4b.bd_info->bb_free >= minlen) {
 			cnt = ext4_trim_all_free(sb, &e4b, first_block,

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