[PATCH v4 14/17] xfs: mount-api - add xfs_fc_free()

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

Signed-off-by: Ian Kent <raven@xxxxxxxxxx>
---
 fs/xfs/xfs_super.c |   26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 06f650fb3a8c..4f2963ff9e06 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -2133,10 +2133,36 @@ 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;
+
+	/*
+	 * When the mount context is initialized the private
+	 * struct xfs_mount info (mp) is allocated and stored in
+	 * the fs context along with the struct xfs_fs_context
+	 * (ctx) mount context working working storage.
+	 *
+	 * On super block allocation the mount info struct, mp,
+	 * is moved into private super block info field ->s_fs_info
+	 * of the newly allocated super block. But if an error occurs
+	 * before this happens it's the responsibility of the fs
+	 * context to release the mount info struct.
+	 */
+	if (mp) {
+		kfree(mp->m_logname);
+		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 = {




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