Re: [rfc 3/7] procfs: Add ability to plugin auxiliary fdinfo providers

[Pavel Emelyanov]

On 06/27/2012 03:01 PM, Cyrill Gorcunov wrote:
> This patch brings ability to plugin auxiliary fdinfo providers.
> For example in further patches eventfd, evenpoll and fsnotify
> will print out information associated with files.
> 
> This feature is CONFIG_CHECKPOINT_RESTORE guarded to eliminate
> overhead for those who don't need it at all (this
> unfortunately makes patch bigger than I wanted).
> 
> Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
> CC: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> CC: Alexey Dobriyan <adobriyan@xxxxxxxxx>
> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> CC: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
> CC: James Bottomley <jbottomley@xxxxxxxxxxxxx>
> ---
>  fs/proc/fd.c            |  208 ++++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/proc_fs.h |   28 ++++++
>  2 files changed, 236 insertions(+)

How about introducing one more file_operations member and call it in the
seq_show() (if exists)? Only inotify, eventfd and eventpoll will implement
one. This will allow to avoid all this complexity with drivers.
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