[PATCH 5.15 722/846] ext4: destroy ext4_fc_dentry_cachep kmemcache on module removal

[Greg Kroah-Hartman]

From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Reviewed-by: Lukas Czerner <lczerner@xxxxxxxxxx>
Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@xxxxxxxxx>
Link: https://lore.kernel.org/r/20211110134640.lyku5vklvdndw6uk@xxxxxxxxxxxxx
Link: https://lore.kernel.org/r/YbiK3JetFFl08bd7@xxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20211223164436.2628390-1-bigeasy@xxxxxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Cc: stable@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 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();