Re: [PATCH 09/18] btrfs: Fix return value of read_extent_buffer_pages() when lock page failed

[Chris Mason <chris.mason@oracle.com>]

On Thu, Mar 25, 2010 at 08:33:27PM +0800, Miao Xie wrote:
> From: Zhao Lei <zhaolei@cn.fujitsu.com>
> 
> read_extent_buffer_pages() should return error value instead of 0 when
> lock page failed, we fix this problem.

[ Thanks for all of these patches! ]

This isn't strictly an IO error, the caller has said they are not
willing to wait, so we don't wait.  That's different from finding a page
where the IO had failed.

In general we ignore the errors until the caller is willing to wait for
the result.

-chris

> 
> Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
> ---
>  fs/btrfs/extent_io.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index bdfbfa6..3194c79 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -3419,8 +3419,10 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
>  	for (i = start_i; i < num_pages; i++) {
>  		page = extent_buffer_page(eb, i);
>  		if (!wait) {
> -			if (!trylock_page(page))
> +			if (!trylock_page(page)) {
> +				ret = -EIO;
>  				goto unlock_exit;
> +			}
>  		} else {
>  			lock_page(page);
>  		}
> -- 
> 1.6.5.2
> 
> 
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