Re: [ANNOUNCEMENT PATCH COW] proof of concept impementation of cowlinks

[Jan Harkes]

Forgot a somewhat useful line there,

On Tue, May 11, 2004 at 10:08:53AM -0400, Jan Harkes wrote:
> int my_file_sendfile(struct file *in_file, loff_t *ppos, size_t count,
> 		     read_actor_t actor, void __user *target)
> {
>     struct file *out_file = NULL;
> 
>     /* We have to check the read_actor callback function to see if the
>      * target actually points at a struct file. */
>     if (actor != file_send_actor)
> 	goto copy_local;

      out_file = (struct file *)target;

>     /* are both source and destination within the same file system
>      * mountpoint? */
>     if (in_file->f_dentry->d_inode->i_sb != out_file->f_dentry->d_inode->i_sb)
> 	goto copy_local;

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