1 files changed, 27 insertions, 0 deletions

diff --git a/fs/nilfs2/alloc.c b/fs/nilfs2/alloc.c
index 7e2b3ce57aa9..c56300d8d177 100644
--- a/fs/nilfs2/alloc.c
+++ b/fs/nilfs2/alloc.c
@@ -491,3 +491,30 @@ int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
         }
         return 0;
 }
+
+void nilfs_palloc_setup_cache(struct inode *inode,
+                              struct nilfs_palloc_cache *cache)
+{
+        NILFS_MDT(inode)->mi_palloc_cache = cache;
+        spin_lock_init(&cache->lock);
+}
+
+void nilfs_palloc_clear_cache(struct inode *inode)
+{
+        struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+        spin_lock(&cache->lock);
+        brelse(cache->prev_desc.bh);
+        brelse(cache->prev_bitmap.bh);
+        brelse(cache->prev_entry.bh);
+        cache->prev_desc.bh = NULL;
+        cache->prev_bitmap.bh = NULL;
+        cache->prev_entry.bh = NULL;
+        spin_unlock(&cache->lock);
+}
+
+void nilfs_palloc_destroy_cache(struct inode *inode)
+{
+        nilfs_palloc_clear_cache(inode);
+        NILFS_MDT(inode)->mi_palloc_cache = NULL;
+}