linux-kernel - Re: [PATCH] Always report a writeback error once

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Message-ID: <20180423215150.GI13383@bombadil.infradead.org>
Date:   Mon, 23 Apr 2018 14:51:50 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Andres Freund <andres@...razel.de>
Cc:     linux-fsdevel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Always report a writeback error once

On Mon, Apr 23, 2018 at 02:43:48PM -0700, Matthew Wilcox wrote:
> On Mon, Apr 23, 2018 at 01:57:30PM -0700, Andres Freund wrote:
> > On 2018-04-23 13:42:08 -0700, Matthew Wilcox wrote:
> > > @@ -119,19 +119,11 @@ EXPORT_SYMBOL(errseq_set);
> > >  errseq_t errseq_sample(errseq_t *eseq)
> > >  {
> > 
> > There's a comment above this:
> >  *
> >  * This function allows callers to sample an errseq_t value, marking it as
> >  * "seen" if required.
> 
> Oh, good catch.  I'll fix that.  Thanks!

How does this look?

@@ -111,27 +111,22 @@ EXPORT_SYMBOL(errseq_set);
  * errseq_sample() - Grab current errseq_t value.
  * @eseq: Pointer to errseq_t to be sampled.
  *
- * This function allows callers to sample an errseq_t value, marking it as
- * "seen" if required.
+ * This function allows callers to initialise their errseq_t variable.
+ * If the error has been "seen", new callers will not see an old error.
+ * If there is an unseen error in @eseq, the caller of this function will
+ * see it the next time it checks for an error.
  *
+ * Context: Any context.
  * Return: The current errseq value.
  */
 errseq_t errseq_sample(errseq_t *eseq)