[Devel] [PATCH rh7] ext4: add generic uevent infrastructure

[Igor Sukhih]

On 06/05/2017 07:40 PM, Andrey Ryabinin wrote:
> From: Dmitry Monakhov <dmonakhov at openvz.org>
>
> *Purpose:
> It is reasonable to annaunce fs related events via uevent infrastructure.
> This patch implement only ext4'th part, but IMHO this should be usefull for
> any generic filesystem.
>
> Example: Runtime fs-error is pure async event. Currently there is no good
> way to handle this situation and inform user-space about this.
>
> *Implementation:
>   Add uevent infrastructure similar to dm uevent
>   FS_ACTION = {MOUNT|UMOUNT|REMOUNT|ERROR|FREEZE|UNFREEZE}
>   FS_UUID
>   FS_NAME
>   FS_TYPE
>
> Signed-off-by: Dmitry Monakhov <dmonakhov at openvz.org>
>
> h
> +
>   /* Deal with the reporting of failure conditions on a filesystem such as
>    * inconsistencies detected or read IO failures.
>    *
> @@ -411,6 +485,7 @@ static void ext4_handle_error(struct super_block *sb)
>   	if (test_opt(sb, ERRORS_PANIC))
>   		panic("EXT4-fs (device %s): panic forced after error\n",
>   			sb->s_id);
> +	ext4_send_uevent(sb, EXT4_UA_ERROR);
>
>
Pls make high rate protection for EXT4_UA_ERROR.
It would be great to emit single fserror event on remount to RO

--
  Igor.