1 files changed, 22 insertions, 0 deletions

diff --git a/fs/nilfs2/ifile.c b/fs/nilfs2/ifile.c
index d8e65bde083c..6548c7851b48 100644
--- a/fs/nilfs2/ifile.c
+++ b/fs/nilfs2/ifile.c
@@ -160,6 +160,28 @@ int nilfs_ifile_get_inode_block(struct inode *ifile, ino_t ino,
 }
 
 /**
+ * nilfs_ifile_count_free_inodes - calculate free inodes count
+ * @ifile: ifile inode
+ * @nmaxinodes: current maximum of available inodes count [out]
+ * @nfreeinodes: free inodes count [out]
+ */
+int nilfs_ifile_count_free_inodes(struct inode *ifile,
+                                    u64 *nmaxinodes, u64 *nfreeinodes)
+{
+        u64 nused;
+        int err;
+
+        *nmaxinodes = 0;
+        *nfreeinodes = 0;
+
+        nused = atomic64_read(&NILFS_I(ifile)->i_root->inodes_count);
+        err = nilfs_palloc_count_max_entries(ifile, nused, nmaxinodes);
+        if (likely(!err))
+                *nfreeinodes = *nmaxinodes - nused;
+        return err;
+}
+
+/**
  * nilfs_ifile_read - read or get ifile inode
  * @sb: super block instance
  * @root: root object