linux-kernel - Re: [PATCH 5/5] Make wait_on_retry_sync

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Message-Id: <200710251353.57881.nickpiggin@yahoo.com.au>
Date:	Thu, 25 Oct 2007 13:53:57 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] Make wait_on_retry_sync_kiocb killable

On Friday 19 October 2007 08:26, Matthew Wilcox wrote:
> Use TASK_KILLABLE to allow wait_on_retry_sync_kiocb to return -EINTR.
> All callers then check the return value and break out of their loops.
>
> Signed-off-by: Matthew Wilcox <matthew@....cx>
> ---
>  fs/read_write.c |   17 ++++++++++++-----
>  1 files changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/fs/read_write.c b/fs/read_write.c
> index 124693e..3196a3b 100644
> --- a/fs/read_write.c
> +++ b/fs/read_write.c
> @@ -218,14 +218,15 @@ Einval:
>  	return -EINVAL;
>  }
>
> -static void wait_on_retry_sync_kiocb(struct kiocb *iocb)
> +static int wait_on_retry_sync_kiocb(struct kiocb *iocb)
>  {
> -	set_current_state(TASK_UNINTERRUPTIBLE);
> +	set_current_state(TASK_KILLABLE);
>  	if (!kiocbIsKicked(iocb))
>  		schedule();
>  	else
>  		kiocbClearKicked(iocb);
>  	__set_current_state(TASK_RUNNING);
> +	return fatal_signal_pending(current) ? -EINTR : 0;

Although the EINTR never gets to userspace anyway, is there a good
reason why the last patch for do_generic_mapping_read doesn't pass
back -EINTR?
-
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