Re: [PATCH, RFC] sysfs: relay channel buffers as sysfs attributes

[Christoph Hellwig <hch@infradead.org>]

On Mon, Feb 20, 2006 at 08:05:56AM -0500, Mathieu Desnoyers wrote:
> * LTTng does have its own ltt_poll and ltt_ioctl that are all what is needed to
>   control the interaction with the file (along with the relayfs mmap/unmap).
> 
> In this scenario, the sysfs relay attribute creation would look like :
> 
> - create an empty attr
> - fill some of attr members
> - sysfs_create_relay_file(kobj, attr);
>   (it will overwrite some attr members : kobj, rchan, rchan_buf)
>   * set specific LTTng file operations on the inode

defintily not on sysfs.  sysfs doesn't allow drivers to modify the
file operations for good reasons.  it'll probably work the same as-is
when you use the rely file operations on debugfs or a custom filesystem,
although you're code will have zero chance to get merged when it modifies
an existing file operations struct or adds an ioctl.