hpfs: make freeing sbi and codetables rcu-delayed

[~andy/linux] / fs / hpfs / super.c

diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 4334cda8dba144eeb36e57f3d3457b90b14ad15b..b8d01ef6f531752cc4c97e2164c2c4a9131c533a 100644 (file)
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -101,18 +101,24 @@ int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
        return 0;
 }
 
-static void hpfs_put_super(struct super_block *s)
+static void free_sbi(struct hpfs_sb_info *sbi)
 {
-       struct hpfs_sb_info *sbi = hpfs_sb(s);
+       kfree(sbi->sb_cp_table);
+       kfree(sbi->sb_bmp_dir);
+       kfree(sbi);
+}
 
+static void lazy_free_sbi(struct rcu_head *rcu)
+{
+       free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
+}
+
+static void hpfs_put_super(struct super_block *s)
+{
        hpfs_lock(s);
        unmark_dirty(s);
        hpfs_unlock(s);
-
-       kfree(sbi->sb_cp_table);
-       kfree(sbi->sb_bmp_dir);
-       s->s_fs_info = NULL;
-       kfree(sbi);
+       call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
 }
 
 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
@@ -485,9 +491,6 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
        }
        s->s_fs_info = sbi;
 
-       sbi->sb_bmp_dir = NULL;
-       sbi->sb_cp_table = NULL;
-
        mutex_init(&sbi->hpfs_mutex);
        hpfs_lock(s);
 
@@ -679,10 +682,7 @@ bail2:     brelse(bh0);
 bail1:
 bail0:
        hpfs_unlock(s);
-       kfree(sbi->sb_bmp_dir);
-       kfree(sbi->sb_cp_table);
-       s->s_fs_info = NULL;
-       kfree(sbi);
+       free_sbi(sbi);
        return -EINVAL;
 }