[PATCH] xfs: don't leak uuid table on rmmod

["Darrick J. Wong" <darrick.wong@xxxxxxxxxx>]

Don't leak the UUID table when the module is unloaded.
(Found with kmemleak.)

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/xfs/xfs_mount.c |   10 ++++++++++
 fs/xfs/xfs_mount.h |    1 +
 fs/xfs/xfs_super.c |    1 +
 3 files changed, 12 insertions(+)

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index bf92e0c..fe6fe8a 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -47,6 +47,16 @@ static DEFINE_MUTEX(xfs_uuid_table_mutex);
 static int xfs_uuid_table_size;
 static uuid_t *xfs_uuid_table;
 
+void
+xfs_uuid_table_free(void)
+{
+       if (xfs_uuid_table_size == 0)
+               return;
+       kmem_free(xfs_uuid_table);
+       xfs_uuid_table = NULL;
+       xfs_uuid_table_size = 0;
+}
+
 /*
  * See if the UUID is unique among mounted XFS filesystems.
  * Mount fails if UUID is nil or a FS with the same UUID is already mounted.
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 7999e91..d6cbdcb 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -312,6 +312,7 @@ typedef struct xfs_perag {
        int             pagb_count;     /* pagb slots in use */
 } xfs_perag_t;
 
+extern void    xfs_uuid_table_free(void);
 extern int     xfs_log_sbcount(xfs_mount_t *);
 extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
 extern int     xfs_mountfs(xfs_mount_t *mp);
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 904f637..29531ec 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1896,6 +1896,7 @@ exit_xfs_fs(void)
        xfs_mru_cache_uninit();
        xfs_destroy_workqueues();
        xfs_destroy_zones();
+       xfs_uuid_table_free();
 }
 
 module_init(init_xfs_fs);