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    Subject[RFC] [PATCH 3/8] inode-diet: Move i_bdev into a union
    From
    Move the i_bdev pointer in struct inode into a union.

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


    Index: linux-2.6.17/include/linux/fs.h
    ===================================================================
    --- linux-2.6.17.orig/include/linux/fs.h 2006-06-18 19:39:52.000000000 -0400
    +++ linux-2.6.17/include/linux/fs.h 2006-06-18 19:46:10.000000000 -0400
    @@ -511,8 +511,8 @@
    struct list_head i_devices;
    union {
    struct pipe_inode_info *i_pipe;
    + struct block_device *i_bdev;
    };
    - struct block_device *i_bdev;
    struct cdev *i_cdev;
    int i_cindex;

    Index: linux-2.6.17/fs/block_dev.c
    ===================================================================
    --- linux-2.6.17.orig/fs/block_dev.c 2006-06-18 19:37:14.000000000 -0400
    +++ linux-2.6.17/fs/block_dev.c 2006-06-18 19:46:10.000000000 -0400
    @@ -439,7 +439,7 @@
    void bd_forget(struct inode *inode)
    {
    spin_lock(&bdev_lock);
    - if (inode->i_bdev)
    + if (S_ISBLK(inode->i_mode) && inode->i_bdev)
    __bd_forget(inode);
    spin_unlock(&bdev_lock);
    }
    Index: linux-2.6.17/fs/inode.c
    ===================================================================
    --- linux-2.6.17.orig/fs/inode.c 2006-06-18 19:42:16.000000000 -0400
    +++ linux-2.6.17/fs/inode.c 2006-06-18 19:46:10.000000000 -0400
    @@ -255,7 +255,7 @@
    DQUOT_DROP(inode);
    if (inode->i_sb && inode->i_sb->s_op->clear_inode)
    inode->i_sb->s_op->clear_inode(inode);
    - if (inode->i_bdev)
    + if (S_ISBLK(inode->i_mode) && inode->i_bdev)
    bd_forget(inode);
    if (inode->i_cdev)
    cd_forget(inode);
    --
    -
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