linux-kernel - [PATCH 1/2] f2fs: fix to avoid quota inode leak in ->put

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Date:   Fri, 17 Aug 2018 17:18:39 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH 1/2] f2fs: fix to avoid quota inode leak in ->put_super

generic/019 reports below error:

 __quota_error: 1160 callbacks suppressed
 Quota error (device zram1): write_blk: dquota write failed
 Quota error (device zram1): qtree_write_dquot: Error -28 occurred while creating quota
 Quota error (device zram1): write_blk: dquota write failed
 Quota error (device zram1): qtree_write_dquot: Error -28 occurred while creating quota
 Quota error (device zram1): write_blk: dquota write failed
 Quota error (device zram1): qtree_write_dquot: Error -28 occurred while creating quota
 Quota error (device zram1): write_blk: dquota write failed
 Quota error (device zram1): qtree_write_dquot: Error -28 occurred while creating quota
 Quota error (device zram1): write_blk: dquota write failed
 Quota error (device zram1): qtree_write_dquot: Error -28 occurred while creating quota
 VFS: Busy inodes after unmount of zram1. Self-destruct in 5 seconds.  Have a nice day...

If we failed in below path due to fail to write dquot block, we will miss
to release quota inode, fix it.

- f2fs_put_super
 - f2fs_quota_off_umount
  - f2fs_quota_off
   - f2fs_quota_sync   <-- failed
   - dquot_quota_off   <-- missed to call

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/super.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index a5df9fbc6355..9647bbcdfd2b 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1977,10 +1977,12 @@ void f2fs_quota_off_umount(struct super_block *sb)
 	for (type = 0; type < MAXQUOTAS; type++) {
 		err = f2fs_quota_off(sb, type);
 		if (err) {
+			int ret = dquot_quota_off(sb, type);
+
 			f2fs_msg(sb, KERN_ERR,
 				"Fail to turn off disk quota "
-				"(type: %d, err: %d), Please "
-				"run fsck to fix it.", type, err);
+				"(type: %d, err: %d, ret:%d), Please "
+				"run fsck to fix it.", type, err, ret);
 			set_sbi_flag(F2FS_SB(sb), SBI_NEED_FSCK);
 		}
 	}
-- 
2.18.0.rc1