Re: [patch 0/7] Asynchronous Notification for ATAPI devices (v2) -resend

[James Bottomley]

On Fri, 2007-05-04 at 11:12 -0700, Kristen Carlson Accardi wrote:
> This patch series implements Asynchronous Notification (AN) for SATA
> ATAPI devices as defined in SATA 2.5 and AHCI 1.1 and higher.  Drives
> which support this feature will send a notification when new media is
> inserted and removed, preventing the need for user space to poll for
> new media.  This support is exposed to user space via a flag that will
> be set in /sys/block/sr*/capability_flags.  If the flag is set, user
> space can disable polling for the new media, and the genhd driver will
> send a KOBJ_CHANGE event with the envp set to MEDIA_CHANGE_EVENT=1.
> 
> Note that this patch only implements support for directly attached
> drives - AN with drives attached to a port multiplier requires 
> additional changes.

I seem to remember when this came up before, the observation was made
that AENs occur for many more things than simple media change notices,
so we should probably have a more generic AEN handling mechanism.  Is
there any plan to move in this direction

James



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