[PATCH] inode-diet: Move i_cdev into a union

Move the i_cdev pointer in struct inode into a union.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/file_table.c b/fs/file_table.c
index 0131ba0..bc35a40 100644 (file)
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -169,7 +169,7 @@ void fastcall __fput(struct file *file)
        if (file->f_op && file->f_op->release)
                file->f_op->release(inode, file);
        security_file_free(file);
-       if (unlikely(inode->i_cdev != NULL))
+       if (unlikely(S_ISCHR(inode->i_mode) && inode->i_cdev != NULL))
                cdev_put(inode->i_cdev);
        fops_put(file->f_op);
        if (file->f_mode & FMODE_WRITE)

diff --git a/fs/inode.c b/fs/inode.c
index 41b4622..f5c04dd 100644 (file)
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -256,7 +256,7 @@ void clear_inode(struct inode *inode)
                inode->i_sb->s_op->clear_inode(inode);
        if (S_ISBLK(inode->i_mode) && inode->i_bdev)
                bd_forget(inode);
-       if (inode->i_cdev)
+       if (S_ISCHR(inode->i_mode) && inode->i_cdev)
                cd_forget(inode);
        inode->i_state = I_CLEAR;
 }

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 98ff684..192e69b 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -532,8 +532,8 @@ struct inode {
        union {
                struct pipe_inode_info  *i_pipe;
                struct block_device     *i_bdev;
+               struct cdev             *i_cdev;
        };
-       struct cdev             *i_cdev;
        int                     i_cindex;
 
        __u32                   i_generation;