nilfs2: use iget for all metadata files

This makes use of iget5_locked to allocate or get inode for metadata
files to stop using own inode allocator.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

1 files changed, 31 insertions, 18 deletions

diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c
index 18737818db63..03de1da8795b 100644
--- a/fs/nilfs2/cpfile.c
+++ b/fs/nilfs2/cpfile.c
@@ -933,27 +933,40 @@ int nilfs_cpfile_get_stat(struct inode *cpfile, struct nilfs_cpstat *cpstat)
 }
 
 /**
- * nilfs_cpfile_read - read cpfile inode
- * @cpfile: cpfile inode
- * @raw_inode: on-disk cpfile inode
- */
-int nilfs_cpfile_read(struct inode *cpfile, struct nilfs_inode *raw_inode)
-{
-        return nilfs_read_inode_common(cpfile, raw_inode);
-}
-
-/**
- * nilfs_cpfile_new - create cpfile
- * @nilfs: nilfs object
+ * nilfs_cpfile_read - read or get cpfile inode
+ * @sb: super block instance
  * @cpsize: size of a checkpoint entry
+ * @raw_inode: on-disk cpfile inode
+ * @inodep: buffer to store the inode
  */
-struct inode *nilfs_cpfile_new(struct the_nilfs *nilfs, size_t cpsize)
+int nilfs_cpfile_read(struct super_block *sb, size_t cpsize,
+                      struct nilfs_inode *raw_inode, struct inode **inodep)
 {
         struct inode *cpfile;
+        int err;
 
-        cpfile = nilfs_mdt_new(nilfs, NULL, NILFS_CPFILE_INO, 0);
-        if (cpfile)
-                nilfs_mdt_set_entry_size(cpfile, cpsize,
-                                         sizeof(struct nilfs_cpfile_header));
-        return cpfile;
+        cpfile = nilfs_iget_locked(sb, NULL, NILFS_CPFILE_INO);
+        if (unlikely(!cpfile))
+                return -ENOMEM;
+        if (!(cpfile->i_state & I_NEW))
+                goto out;
+
+        err = nilfs_mdt_init(cpfile, NILFS_MDT_GFP, 0);
+        if (err)
+                goto failed;
+
+        nilfs_mdt_set_entry_size(cpfile, cpsize,
+                                 sizeof(struct nilfs_cpfile_header));
+
+        err = nilfs_read_inode_common(cpfile, raw_inode);
+        if (err)
+                goto failed;
+
+        unlock_new_inode(cpfile);
+ out:
+        *inodep = cpfile;
+        return 0;
+ failed:
+        iget_failed(cpfile);
+        return err;
 }