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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Lukas Czerner <lczerner@redhat.com>,
        Harshad Shirwadkar <harshadshirwadkar@gmail.com>,
        Theodore Tso <tytso@mit.edu>, stable@kernel.org
Subject: [PATCH 5.15 722/846] ext4: destroy ext4_fc_dentry_cachep kmemcache on module removal
Date:   Mon, 24 Jan 2022 19:43:59 +0100
Message-Id: <20220124184125.918380838@linuxfoundation.org>
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References: <20220124184100.867127425@linuxfoundation.org>
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

commit ab047d516dea72f011c15c04a929851e4d053109 upstream.

The kmemcache for ext4_fc_dentry_cachep remains registered after module
removal.

Destroy ext4_fc_dentry_cachep kmemcache on module removal.

Fixes: aa75f4d3daaeb ("ext4: main fast-commit commit path")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20211110134640.lyku5vklvdndw6uk@linutronix.de
Link: https://lore.kernel.org/r/YbiK3JetFFl08bd7@linutronix.de
Link: https://lore.kernel.org/r/20211223164436.2628390-1-bigeasy@linutronix.de
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/ext4/ext4.h        |    1 +
 fs/ext4/fast_commit.c |    5 +++++
 fs/ext4/super.c       |    2 ++
 3 files changed, 8 insertions(+)

--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2934,6 +2934,7 @@ bool ext4_fc_replay_check_excluded(struc
 void ext4_fc_replay_cleanup(struct super_block *sb);
 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
 int __init ext4_fc_init_dentry_cache(void);
+void ext4_fc_destroy_dentry_cache(void);
 
 /* mballoc.c */
 extern const struct seq_operations ext4_mb_seq_groups_ops;
--- a/fs/ext4/fast_commit.c
+++ b/fs/ext4/fast_commit.c
@@ -2188,3 +2188,8 @@ int __init ext4_fc_init_dentry_cache(voi
 
 	return 0;
 }
+
+void ext4_fc_destroy_dentry_cache(void)
+{
+	kmem_cache_destroy(ext4_fc_dentry_cachep);
+}
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -6653,6 +6653,7 @@ static int __init ext4_init_fs(void)
 out:
 	unregister_as_ext2();
 	unregister_as_ext3();
+	ext4_fc_destroy_dentry_cache();
 out05:
 	destroy_inodecache();
 out1:
@@ -6679,6 +6680,7 @@ static void __exit ext4_exit_fs(void)
 	unregister_as_ext2();
 	unregister_as_ext3();
 	unregister_filesystem(&ext4_fs_type);
+	ext4_fc_destroy_dentry_cache();
 	destroy_inodecache();
 	ext4_exit_mballoc();
 	ext4_exit_sysfs();