From: Eric Sandeen <sandeen@redhat.com>
To: ext4 development <linux-ext4@vger.kernel.org>
Subject: [PATCH] ext4: fix overhead calculations in ext4_stats, again
Date: Thu, 25 Oct 2012 11:59:02 -0500 [thread overview]
Message-ID: <50896FD6.1010807@redhat.com> (raw)
"overhead" was a write-only variable in this function after commit
952fc18e; we set it to 0 for minixdf, or to sbi->s_overhead if !minixdf,
but never read it again after that.
We need to use it, not sbi->s_overhead, when subtracting out overhead
for f_blocks, or we get the wrong answer for minixdf.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
"Once more, with feeling!" ;)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e44b233..2feaf78 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4758,7 +4758,7 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_type = EXT4_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
- buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, sbi->s_overhead);
+ buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
/* prevent underflow in case that few free space is available */
next reply other threads:[~2012-10-25 16:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-25 16:59 Eric Sandeen [this message]
2012-10-25 17:14 ` [PATCH] ext4: fix overhead calculations in ext4_statfs, again Eric Sandeen
2012-10-29 17:13 ` [PATCH] ext4: fix overhead calculations in ext4_stats, again Jan Kara
2012-11-08 15:34 ` Theodore Ts'o
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