ext4: dynamically allocate the jbd2_inode in ext4_inode_info as necessary

Replace the jbd2_inode structure (which is 48 bytes) with a pointer
and only allocate the jbd2_inode when it is needed --- that is, when
the file system has a journal present and the inode has been opened
for writing.  This allows us to further slim down the ext4_inode_info
structure.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 22 insertions, 0 deletions

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 5a5c55ddceef..bb003dc9ffff 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -104,6 +104,7 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
 {
         struct super_block *sb = inode->i_sb;
         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
+        struct ext4_inode_info *ei = EXT4_I(inode);
         struct vfsmount *mnt = filp->f_path.mnt;
         struct path path;
         char buf[64], *cp;
@@ -127,6 +128,27 @@ static int ext4_file_open(struct inode * inode, struct file * filp)
                         ext4_mark_super_dirty(sb);
                 }
         }
+        /*
+         * Set up the jbd2_inode if we are opening the inode for
+         * writing and the journal is present
+         */
+        if (sbi->s_journal && !ei->jinode && (filp->f_mode & FMODE_WRITE)) {
+                struct jbd2_inode *jinode = jbd2_alloc_inode(GFP_KERNEL);
+
+                spin_lock(&inode->i_lock);
+                if (!ei->jinode) {
+                        if (!jinode) {
+                                spin_unlock(&inode->i_lock);
+                                return -ENOMEM;
+                        }
+                        ei->jinode = jinode;
+                        jbd2_journal_init_jbd_inode(ei->jinode, inode);
+                        jinode = NULL;
+                }
+                spin_unlock(&inode->i_lock);
+                if (unlikely(jinode != NULL))
+                        jbd2_free_inode(jinode);
+        }
         return dquot_file_open(inode, filp);
 }