Re: [PATCH 0/3] mm/fs: get PG_error out of the writeback reporting business

From: Theodore Ts'o
Date: Thu Mar 09 2017 - 10:07:10 EST

On Thu, Mar 09, 2017 at 07:43:12AM -0500, Jeff Layton wrote:
> Maybe we need a systemwide (or fs-level) tunable that makes ENOSPC a
> transient error? Just have it hang until we get enough space when that
> tunable is enabled?

Or maybe we need a new kernel-internal errno (ala ERESTARSYS) which
means it's a "soft ENOSPC"? It would get translated to ENOSPC if it
gets propagated to userspace, but that way for devices like dm-thin or
other storage array with thin volumes, it could send back a soft
ENOSPC, while for file systems where "ENOSPC means ENOSPC", we can
treat those as a hard ENOSPC.

- Ted