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From: Jan Kara <jack@suse.cz>
To: <linux-ext4@vger.kernel.org>
Cc: Ted Tso <tytso@mit.edu>, Jan Kara <jack@suse.cz>
Subject: [PATCH 1/2] ext4: Make sure quota gets properly shutdown on error
Date: Thu,  7 Oct 2021 17:53:35 +0200	[thread overview]
Message-ID: <20211007155336.12493-2-jack@suse.cz> (raw)
In-Reply-To: <20211007155336.12493-1-jack@suse.cz>

When we hit an error when enabling quotas and setting inode flags, we do
not properly shutdown quota subsystem despite returning error from
Q_QUOTAON quotactl. This can lead to some odd situations like kernel
using quota file while it is still writeable for userspace. Make sure we
properly cleanup the quota subsystem in case of error.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/ext4/super.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 88d5d274a868..fbe9cae63786 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -6267,10 +6267,7 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
 
 	lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
 	err = dquot_quota_on(sb, type, format_id, path);
-	if (err) {
-		lockdep_set_quota_inode(path->dentry->d_inode,
-					     I_DATA_SEM_NORMAL);
-	} else {
+	if (!err) {
 		struct inode *inode = d_inode(path->dentry);
 		handle_t *handle;
 
@@ -6290,7 +6287,12 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
 		ext4_journal_stop(handle);
 	unlock_inode:
 		inode_unlock(inode);
+		if (err)
+			dquot_quota_off(sb, type);
 	}
+	if (err)
+		lockdep_set_quota_inode(path->dentry->d_inode,
+					     I_DATA_SEM_NORMAL);
 	return err;
 }
 
-- 
2.26.2


  reply	other threads:[~2021-10-07 15:53 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-07 15:53 [PATCH 0/2] ext4: Quota enabling error handling fixes Jan Kara
2021-10-07 15:53 ` Jan Kara [this message]
2021-10-07 15:53 ` [PATCH 2/2] ext4: Make sure to reset inode lockdep class when quota enabling fails Jan Kara
2021-12-27  5:34 ` [PATCH 0/2] ext4: Quota enabling error handling fixes Theodore Ts'o

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