nilfs2: separate initializer of metadata file inode

This separates a part of initialization code of metadata file inode,
and makes it available from the nilfs iget function that a later patch
will add to.

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

1 files changed, 27 insertions, 17 deletions

diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index ee943a342e1d..73e5da3b097e 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -439,6 +439,27 @@ static const struct address_space_operations def_mdt_aops = {
 static const struct inode_operations def_mdt_iops;
 static const struct file_operations def_mdt_fops;
 
+
+int nilfs_mdt_init(struct inode *inode, struct the_nilfs *nilfs,
+                   gfp_t gfp_mask, size_t objsz)
+{
+        struct nilfs_mdt_info *mi;
+
+        mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
+        if (!mi)
+                return -ENOMEM;
+
+        mi->mi_nilfs = nilfs;
+        init_rwsem(&mi->mi_sem);
+        inode->i_private = mi;
+
+        inode->i_mode = S_IFREG;
+        mapping_set_gfp_mask(inode->i_mapping, gfp_mask);
+        inode->i_mapping->backing_dev_info = nilfs->ns_bdi;
+
+        return 0;
+}
+
 /*
  * NILFS2 uses pseudo inodes for meta data files such as DAT, cpfile, sufile,
  * ifile, or gcinodes.  This allows the B-tree code and segment constructor
@@ -454,12 +475,10 @@ static const struct file_operations def_mdt_fops;
  * @nilfs: nilfs object
  * @sb: super block instance the metadata file belongs to
  * @ino: inode number
- * @gfp_mask: gfp mask for data pages
- * @objsz: size of the private object attached to inode->i_private
  */
 struct inode *
 nilfs_mdt_new_common(struct the_nilfs *nilfs, struct super_block *sb,
-                     ino_t ino, gfp_t gfp_mask, size_t objsz)
+                     ino_t ino)
 {
         struct inode *inode = nilfs_alloc_inode_common(nilfs);
 
@@ -467,15 +486,6 @@ nilfs_mdt_new_common(struct the_nilfs *nilfs, struct super_block *sb,
                 return NULL;
         else {
                 struct address_space * const mapping = &inode->i_data;
-                struct nilfs_mdt_info *mi;
-
-                mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS);
-                if (!mi) {
-                        nilfs_destroy_inode(inode);
-                        return NULL;
-                }
-                mi->mi_nilfs = nilfs;
-                init_rwsem(&mi->mi_sem);
 
                 inode->i_sb = sb; /* sb may be NULL for some meta data files */
                 inode->i_blkbits = nilfs->ns_blocksize_bits;
@@ -483,8 +493,6 @@ nilfs_mdt_new_common(struct the_nilfs *nilfs, struct super_block *sb,
                 atomic_set(&inode->i_count, 1);
                 inode->i_nlink = 1;
                 inode->i_ino = ino;
-                inode->i_mode = S_IFREG;
-                inode->i_private = mi;
 
 #ifdef INIT_UNUSED_INODE_FIELDS
                 atomic_set(&inode->i_writecount, 0);
@@ -515,9 +523,7 @@ nilfs_mdt_new_common(struct the_nilfs *nilfs, struct super_block *sb,
 
                 mapping->host = NULL;  /* instead of inode */
                 mapping->flags = 0;
-                mapping_set_gfp_mask(mapping, gfp_mask);
                 mapping->assoc_mapping = NULL;
-                mapping->backing_dev_info = nilfs->ns_bdi;
 
                 inode->i_mapping = mapping;
         }
@@ -530,10 +536,14 @@ struct inode *nilfs_mdt_new(struct the_nilfs *nilfs, struct super_block *sb,
 {
         struct inode *inode;
 
-        inode = nilfs_mdt_new_common(nilfs, sb, ino, NILFS_MDT_GFP, objsz);
+        inode = nilfs_mdt_new_common(nilfs, sb, ino);
         if (!inode)
                 return NULL;
 
+        if (nilfs_mdt_init(inode, nilfs, NILFS_MDT_GFP, objsz) < 0) {
+                nilfs_destroy_inode(inode);
+                return NULL;
+        }
         inode->i_op = &def_mdt_iops;
         inode->i_fop = &def_mdt_fops;
         inode->i_mapping->a_ops = &def_mdt_aops;