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Date:	Thu, 25 Oct 2007 14:37:55 -0700
Subject: + ext4-fix-freespace-accounting-with-mballoc-on-32bit-machines.patch added to -mm tree

The patch titled
     ext4: fix freespace accounting with mballoc on 32bit machines
has been added to the -mm tree.  Its filename is

*** Remember to use Documentation/SubmitChecklist when testing your code ***

See to find
out what to do about this

Subject: ext4: fix freespace accounting with mballoc on 32bit machines
From: Eric Sandeen <>

On a 32bit machine, passing the negative unsigned long fe_len
into percpu_counter_add (which expects s64) messes up the counters:

[root@...r-05 linux-2.6.23-rc7]# df -h

Filesystem            Size  Used Avail Use% Mounted on
/dev/sdb7              97G -149P  149P   -  /mnt/test

Patch below fixes this.

Signed-off-by: Eric Sandeen <>
Cc: <>
Signed-off-by: Andrew Morton <>

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

diff -puN fs/ext4/mballoc.c~ext4-fix-freespace-accounting-with-mballoc-on-32bit-machines fs/ext4/mballoc.c
--- a/fs/ext4/mballoc.c~ext4-fix-freespace-accounting-with-mballoc-on-32bit-machines
+++ a/fs/ext4/mballoc.c
@@ -3036,7 +3036,7 @@ static int ext4_mb_mark_diskspace_used(s
 				- ac->ac_b_ex.fe_len);
 	gdp->bg_checksum = ext4_group_desc_csum(sbi, ac->ac_b_ex.fe_group, gdp);
 	spin_unlock(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group));
-	percpu_counter_add(&sbi->s_freeblocks_counter, - ac->ac_b_ex.fe_len);
+	percpu_counter_sub(&sbi->s_freeblocks_counter, ac->ac_b_ex.fe_len);
 	err = ext4_journal_dirty_metadata(handle, bitmap_bh);
 	if (err)

Patches currently in -mm which might be from are


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