1 files changed, 35 insertions, 26 deletions

diff --git a/fs/nilfs2/dat.c b/fs/nilfs2/dat.c
index 7091c4e0f042..ab04a68f425d 100644
--- a/fs/nilfs2/dat.c
+++ b/fs/nilfs2/dat.c
@@ -463,39 +463,48 @@ ssize_t nilfs_dat_get_vinfo(struct inode *dat, void *buf, unsigned visz,
 }
 
 /**
- * nilfs_dat_read - read dat inode
- * @dat: dat inode
- * @raw_inode: on-disk dat inode
- */
-int nilfs_dat_read(struct inode *dat, struct nilfs_inode *raw_inode)
-{
-        return nilfs_read_inode_common(dat, raw_inode);
-}
-
-/**
- * nilfs_dat_new - create dat file
- * @nilfs: nilfs object
+ * nilfs_dat_read - read or get dat inode
+ * @sb: super block instance
  * @entry_size: size of a dat entry
+ * @raw_inode: on-disk dat inode
+ * @inodep: buffer to store the inode
  */
-struct inode *nilfs_dat_new(struct the_nilfs *nilfs, size_t entry_size)
+int nilfs_dat_read(struct super_block *sb, size_t entry_size,
+                   struct nilfs_inode *raw_inode, struct inode **inodep)
 {
         static struct lock_class_key dat_lock_key;
         struct inode *dat;
         struct nilfs_dat_info *di;
         int err;
 
-        dat = nilfs_mdt_new(nilfs, NULL, NILFS_DAT_INO, sizeof(*di));
-        if (dat) {
-                err = nilfs_palloc_init_blockgroup(dat, entry_size);
-                if (unlikely(err)) {
-                        nilfs_mdt_destroy(dat);
-                        return NULL;
-                }
+        dat = nilfs_iget_locked(sb, NULL, NILFS_DAT_INO);
+        if (unlikely(!dat))
+                return -ENOMEM;
+        if (!(dat->i_state & I_NEW))
+                goto out;
 
-                di = NILFS_DAT_I(dat);
-                lockdep_set_class(&di->mi.mi_sem, &dat_lock_key);
-                nilfs_palloc_setup_cache(dat, &di->palloc_cache);
-                nilfs_mdt_setup_shadow_map(dat, &di->shadow);
-        }
-        return dat;
+        err = nilfs_mdt_init(dat, NILFS_MDT_GFP, sizeof(*di));
+        if (err)
+                goto failed;
+
+        err = nilfs_palloc_init_blockgroup(dat, entry_size);
+        if (err)
+                goto failed;
+
+        di = NILFS_DAT_I(dat);
+        lockdep_set_class(&di->mi.mi_sem, &dat_lock_key);
+        nilfs_palloc_setup_cache(dat, &di->palloc_cache);
+        nilfs_mdt_setup_shadow_map(dat, &di->shadow);
+
+        err = nilfs_read_inode_common(dat, raw_inode);
+        if (err)
+                goto failed;
+
+        unlock_new_inode(dat);
+ out:
+        *inodep = dat;
+        return 0;
+ failed:
+        iget_failed(dat);
+        return err;
 }