linux-kernel - [PATCH 4.19 082/195] f2fs: fix miscounted block limit in f2fs_statfs

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Date:   Mon, 10 Feb 2020 04:32:20 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org
Subject: [PATCH 4.19 082/195] f2fs: fix miscounted block limit in f2fs_statfs_project()

From: Chengguang Xu <cgxu519@...ernel.net>

commit acdf2172172a511f97fa21ed0ee7609a6d3b3a07 upstream.

statfs calculates Total/Used/Avail disk space in block unit,
so we should translate soft/hard prjquota limit to block unit
as well.

Below testing result shows the block/inode numbers of
Total/Used/Avail from df command are all correct afer
applying this patch.

[root@...alhost quota-tools]\# ./repquota -P /dev/sdb1
---
 fs/f2fs/super.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1154,6 +1154,8 @@ static int f2fs_statfs_project(struct su
 	if (dquot->dq_dqb.dqb_bhardlimit &&
 			(!limit || dquot->dq_dqb.dqb_bhardlimit < limit))
 		limit = dquot->dq_dqb.dqb_bhardlimit;
+	if (limit)
+		limit >>= sb->s_blocksize_bits;
 
 	if (limit && buf->f_blocks > limit) {
 		curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;