[PATCH 07/10] xfs: mount-api - add xfs_fc_free()

[Ian Kent <raven@themaw.net>]

Add the fs_context_operations method .free that performs fs
context cleanup on context release.

Signed-off-by: Ian Kent <raven@themaw.net>
---
 fs/xfs/xfs_super.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 7326b21b32d1..0a771e1390e7 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -2413,10 +2413,33 @@ static const struct super_operations xfs_super_operations = {
 	.free_cached_objects	= xfs_fs_free_cached_objects,
 };
 
+static void xfs_fc_free(struct fs_context *fc)
+{
+	struct xfs_fs_context	*ctx = fc->fs_private;
+	struct xfs_mount	*mp = fc->s_fs_info;
+
+	if (mp) {
+		/*
+		 * If an error occurs before ownership the xfs_mount
+		 * info struct is passed to xfs by the VFS (by assigning
+		 * it to sb->s_fs_info and clearing the corresponding
+		 * fs_context field, done before calling fill super via
+		 * .get_tree()) there may be some strings to cleanup.
+		 */
+		if (mp->m_logname)
+			kfree(mp->m_logname);
+		if (mp->m_rtname)
+			kfree(mp->m_rtname);
+		kfree(mp);
+	}
+	kfree(ctx);
+}
+
 static const struct fs_context_operations xfs_context_ops = {
 	.parse_param = xfs_parse_param,
 	.get_tree    = xfs_get_tree,
 	.reconfigure = xfs_reconfigure,
+	.free	     = xfs_fc_free,
 };
 
 static struct file_system_type xfs_fs_type = {