lkml.org 
[lkml]   [2020]   [Feb]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5.4 63/66] ext4: choose hardlimit when softlimit is larger than hardlimit in ext4_statfs_project()
Date
From: Chengguang Xu <cgxu519@mykernel.net>

[ Upstream commit 57c32ea42f8e802bda47010418e25043e0c9337f ]

Setting softlimit larger than hardlimit seems meaningless
for disk quota but currently it is allowed. In this case,
there may be a bit of comfusion for users when they run
df comamnd to directory which has project quota.

For example, we set 20M softlimit and 10M hardlimit of
block usage limit for project quota of test_dir(project id 123).

[root@hades mnt_ext4]# repquota -P -a
*** Report for project quotas on device /dev/loop0
Block grace time: 7days; Inode grace time: 7days
Block limits File limits
Project used soft hard grace used soft hard grace
----------------------------------------------------------------------
0 -- 13 0 0 2 0 0
123 -- 10237 20480 10240 5 200 100

The result of df command as below:

[root@hades mnt_ext4]# df -h test_dir
Filesystem Size Used Avail Use% Mounted on
/dev/loop0 20M 10M 10M 50% /home/cgxu/test/mnt_ext4

Even though it looks like there is another 10M free space to use,
if we write new data to diretory test_dir(inherit project id),
the write will fail with errno(-EDQUOT).

After this patch, the df result looks like below.

[root@hades mnt_ext4]# df -h test_dir
Filesystem Size Used Avail Use% Mounted on
/dev/loop0 10M 10M 3.0K 100% /home/cgxu/test/mnt_ext4

Signed-off-by: Chengguang Xu <cgxu519@mykernel.net>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20191016022501.760-1-cgxu519@mykernel.net
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/ext4/super.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 95826bde9025b..914230e630544 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5540,9 +5540,15 @@ static int ext4_statfs_project(struct super_block *sb,
return PTR_ERR(dquot);
spin_lock(&dquot->dq_dqb_lock);

- limit = (dquot->dq_dqb.dqb_bsoftlimit ?
- dquot->dq_dqb.dqb_bsoftlimit :
- dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
+ limit = 0;
+ if (dquot->dq_dqb.dqb_bsoftlimit &&
+ (!limit || dquot->dq_dqb.dqb_bsoftlimit < limit))
+ limit = dquot->dq_dqb.dqb_bsoftlimit;
+ if (dquot->dq_dqb.dqb_bhardlimit &&
+ (!limit || dquot->dq_dqb.dqb_bhardlimit < limit))
+ limit = dquot->dq_dqb.dqb_bhardlimit;
+ limit >>= sb->s_blocksize_bits;
+
if (limit && buf->f_blocks > limit) {
curblock = (dquot->dq_dqb.dqb_curspace +
dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
@@ -5552,9 +5558,14 @@ static int ext4_statfs_project(struct super_block *sb,
(buf->f_blocks - curblock) : 0;
}

- limit = dquot->dq_dqb.dqb_isoftlimit ?
- dquot->dq_dqb.dqb_isoftlimit :
- dquot->dq_dqb.dqb_ihardlimit;
+ limit = 0;
+ if (dquot->dq_dqb.dqb_isoftlimit &&
+ (!limit || dquot->dq_dqb.dqb_isoftlimit < limit))
+ limit = dquot->dq_dqb.dqb_isoftlimit;
+ if (dquot->dq_dqb.dqb_ihardlimit &&
+ (!limit || dquot->dq_dqb.dqb_ihardlimit < limit))
+ limit = dquot->dq_dqb.dqb_ihardlimit;
+
if (limit && buf->f_files > limit) {
buf->f_files = limit;
buf->f_ffree =
--
2.20.1


\
 
 \ /
  Last update: 2020-02-18 21:01    [W:0.262 / U:0.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site