Re: [RESEND][RFC PATCH] blkcg: rewind seq_file if no stats

[Christoph Hellwig]

On Fri, May 13, 2022 at 10:40:30AM -0700, Khazhismel Kumykov wrote:
> Restores the previous behavior of only displaying devices for which we
> have statistics (and removes the current, broken, behavior of printing
> devname with no newline if no statistics)
> 
> In lieu of get_seq_buf + seq_commit, provide a way to "undo" writes if
> we use seq_printf

I have to say I much prefer the simpler fix from Wolfgang.  But
if we want to go down this route it needs to split into a patch
for the seq_file infrastruture and a separate one for the blk-cgroup
code.