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

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Date:	Wed, 24 Oct 2007 20:43:57 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Matthew Wilcox <willy@...ux.intel.com>,
	"linux-aio@...ck.org" <linux-aio@...ck.org>
Subject: Re: [PATCH 5/5] Make wait_on_retry_sync_kiocb killable

On Wed, 24 Oct 2007 08:24:58 -0400 Matthew Wilcox <matthew@....cx> 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.
> 

Let's cc the AIO list on AIO patches, please.

> ---
>  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;
>  }
>  
>  ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
> @@ -242,7 +243,9 @@ ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *pp
>  		ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
>  		if (ret != -EIOCBRETRY)
>  			break;
> -		wait_on_retry_sync_kiocb(&kiocb);
> +		ret = wait_on_retry_sync_kiocb(&kiocb);
> +		if (ret)
> +			break;
>  	}
>  
>  	if (-EIOCBQUEUED == ret)
> @@ -300,7 +303,9 @@ ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, lof
>  		ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
>  		if (ret != -EIOCBRETRY)
>  			break;
> -		wait_on_retry_sync_kiocb(&kiocb);
> +		ret = wait_on_retry_sync_kiocb(&kiocb);
> +		if (ret)
> +			break;
>  	}
>  
>  	if (-EIOCBQUEUED == ret)
> @@ -466,7 +471,9 @@ ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov,
>  		ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos);
>  		if (ret != -EIOCBRETRY)
>  			break;
> -		wait_on_retry_sync_kiocb(&kiocb);
> +		ret = wait_on_retry_sync_kiocb(&kiocb);
> +		if (ret)
> +			break;
>  	}
>  
>  	if (ret == -EIOCBQUEUED)
> -- 
> 1.4.4.2
-
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