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From:   Chengguang Xu <cgxu519@mykernel.net>
To:     jaegeuk@kernel.org, chao@kernel.org
Cc:     linux-f2fs-devel@lists.sourceforge.net,
        linux-kernel@vger.kernel.org, Chengguang Xu <cgxu519@mykernel.net>
Message-ID: <20200104142004.12883-1-cgxu519@mykernel.net>
Subject: [f2fs-dev][PATCH 1/2] f2fs: fix miscounted block limit in f2fs_statfs_project()
Date:   Sat,  4 Jan 2020 22:20:03 +0800
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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@localhost quota-tools]\# ./repquota -P /dev/sdb1
*** Report for project quotas on device /dev/sdb1
Block grace time: 7days; Inode grace time: 7days
              Block limits                File limits
Project   used soft    hard  grace  used  soft  hard  grace
-----------------------------------------------------------
\#0   --   4       0       0         1     0     0
\#101 --   0       0       0         2     0     0
\#102 --   0   10240       0         2    10     0
\#103 --   0       0   20480         2     0    20
\#104 --   0   10240   20480         2    10    20
\#105 --   0   20480   10240         2    20    10

[root@localhost sdb1]\# lsattr -p t{1,2,3,4,5}
  101 ----------------N-- t1/a1
  102 ----------------N-- t2/a2
  103 ----------------N-- t3/a3
  104 ----------------N-- t4/a4
  105 ----------------N-- t5/a5

[root@localhost sdb1]\# df -hi t{1,2,3,4,5}
Filesystem     Inodes IUsed IFree IUse% Mounted on
/dev/sdb1        2.4M    21  2.4M    1% /mnt/sdb1
/dev/sdb1          10     2     8   20% /mnt/sdb1
/dev/sdb1          20     2    18   10% /mnt/sdb1
/dev/sdb1          10     2     8   20% /mnt/sdb1
/dev/sdb1          10     2     8   20% /mnt/sdb1

[root@localhost sdb1]\# df -h t{1,2,3,4,5}
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb1        10G  489M  9.6G   5% /mnt/sdb1
/dev/sdb1        10M     0   10M   0% /mnt/sdb1
/dev/sdb1        20M     0   20M   0% /mnt/sdb1
/dev/sdb1        10M     0   10M   0% /mnt/sdb1
/dev/sdb1        10M     0   10M   0% /mnt/sdb1

Fixes: 909110c060f2 ("f2fs: choose hardlimit when softlimit is larger than =
hardlimit in f2fs_statfs_project()")
Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
---
 fs/f2fs/super.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 5111e1ffe58a..78efd0e76174 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1219,6 +1219,8 @@ static int f2fs_statfs_project(struct super_block *sb=
,
 =09if (dquot->dq_dqb.dqb_bhardlimit &&
 =09=09=09(!limit || dquot->dq_dqb.dqb_bhardlimit < limit))
 =09=09limit =3D dquot->dq_dqb.dqb_bhardlimit;
+=09if (limit)
+=09=09limit >>=3D sb->s_blocksize_bits;
=20
 =09if (limit && buf->f_blocks > limit) {
 =09=09curblock =3D dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
--=20
2.21.1