Re: [PATCH] libata, freezer: avoid block device removal while systemis frozen

[Tejun Heo]

Hello,

On Mon, Dec 16, 2013 at 08:12:07PM +0800, Ming Lei wrote:
> Looks we should guarantee that I/O queue is emptied before system sleep,
> otherwise it may be a bug, since battery may be drained up to cause
> data loss or block devices may be disconnected during sleep.

It's a bit beside the point as that's what journaling is for.  Power
loss during suspend isn't all that different from power loss while
suspended.  Also, the filesystems are already synced before entering
suspend, so it shouldn't be an issue.  However, that doesn't guarantee
there aren't no pending bdi work items.  We *hope* to control the
sources with freezer but there's no guarantee about the coverage and
no way to verify that either.

Thanks.

-- 
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/