linux-ext4 - [PATCH 13/13] ntfs3: free the sbi in ->kill

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Date:   Wed,  9 Aug 2023 15:05:45 -0700
From:   Christoph Hellwig <hch@....de>
To:     Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>
Cc:     Namjae Jeon <linkinjeon@...nel.org>,
        Sungjong Seo <sj1557.seo@...sung.com>,
        "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        ntfs3@...ts.linux.dev, linux-xfs@...r.kernel.org
Subject: [PATCH 13/13] ntfs3: free the sbi in ->kill_sb

As a rule of thumb everything allocated to the fs_context and moved into
the super_block should be freed by ->kill_sb so that the teardown
handling doesn't need to be duplicated between the fill_super error
path and put_super.  Implement an ntfs3-specific kill_sb method to do
that.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Christian Brauner <brauner@...nel.org>
---
 fs/ntfs3/super.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/fs/ntfs3/super.c b/fs/ntfs3/super.c
index 727138933a9324..5fffddea554f18 100644
--- a/fs/ntfs3/super.c
+++ b/fs/ntfs3/super.c
@@ -625,10 +625,6 @@ static void ntfs_put_super(struct super_block *sb)
 
 	/* Mark rw ntfs as clear, if possible. */
 	ntfs_set_state(sbi, NTFS_DIRTY_CLEAR);
-
-	put_mount_options(sbi->options);
-	ntfs3_free_sbi(sbi);
-	sb->s_fs_info = NULL;
 }
 
 static int ntfs_statfs(struct dentry *dentry, struct kstatfs *buf)
@@ -1562,15 +1558,7 @@ static int ntfs_fill_super(struct super_block *sb, struct fs_context *fc)
 put_inode_out:
 	iput(inode);
 out:
-	/*
-	 * Free resources here.
-	 * ntfs_fs_free will be called with fc->s_fs_info = NULL
-	 */
-	put_mount_options(sbi->options);
-	ntfs3_free_sbi(sbi);
-	sb->s_fs_info = NULL;
 	kfree(boot2);
-
 	return err;
 }
 
@@ -1726,13 +1714,24 @@ static int ntfs_init_fs_context(struct fs_context *fc)
 	return -ENOMEM;
 }
 
+static void ntfs3_kill_sb(struct super_block *sb)
+{
+	struct ntfs_sb_info *sbi = sb->s_fs_info;
+
+	kill_block_super(sb);
+
+	if (sbi->options)
+		put_mount_options(sbi->options);
+	ntfs3_free_sbi(sbi);
+}
+
 // clang-format off
 static struct file_system_type ntfs_fs_type = {
 	.owner			= THIS_MODULE,
 	.name			= "ntfs3",
 	.init_fs_context	= ntfs_init_fs_context,
 	.parameters		= ntfs_fs_parameters,
-	.kill_sb		= kill_block_super,
+	.kill_sb		= ntfs3_kill_sb,
 	.fs_flags		= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
 };
 // clang-format on
-- 
2.39.2