linux-kernel - Re: [PATCH 1/3] staging: lustre: lov: use correct env in lov_io_data_version

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Date:   Mon, 26 Feb 2018 14:47:56 +0000 (GMT)
From:   James Simmons <jsimmons@...radead.org>
To:     NeilBrown <neilb@...e.com>
cc:     devel@...verdev.osuosl.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oleg Drokin <oleg.drokin@...el.com>,
        Andreas Dilger <andreas.dilger@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH 1/3] staging: lustre: lov: use correct env in
 lov_io_data_version_end()


> lov - the logical object volume manager - is responsible for
> striping data across multiple volumes.
> 
> So when it is given a request, it creates one or more
> sub-requests, one for each target volume.  Each sub_io
> request has a sub_env environment which it operates in.
> 
> When lov_io_data_version_end() calls lov_io_end_wrapper() to
> wait for and close off a sub_io, it passes the wrong
> environment.
> 
> This causes an LINVRNT() to fail in cl2osc_io(), and may
> cause other problems.
> 
> This patch changes the call to use ->sub_env, much like
> other code in the same file.
> 
> Fixes: f0cf21abcccc ("staging: lustre: clio: add CIT_DATA_VERSION and remove IOC_LOV_GETINFO")
> Signed-off-by: NeilBrown <neilb@...e.com>

Reviewed-by: James Simmons <jsimmons@...radead.org>

> ---
>  drivers/staging/lustre/lustre/lov/lov_io.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/lustre/lustre/lov/lov_io.c b/drivers/staging/lustre/lustre/lov/lov_io.c
> index c0dbf6cd53b4..b823f8a21856 100644
> --- a/drivers/staging/lustre/lustre/lov/lov_io.c
> +++ b/drivers/staging/lustre/lustre/lov/lov_io.c
> @@ -483,7 +483,7 @@ lov_io_data_version_end(const struct lu_env *env, const struct cl_io_slice *ios)
>  	struct lov_io_sub *sub;
>  
>  	list_for_each_entry(sub, &lio->lis_active, sub_linkage) {
> -		lov_io_end_wrapper(env, sub->sub_io);
> +		lov_io_end_wrapper(sub->sub_env, sub->sub_io);
>  
>  		parent->u.ci_data_version.dv_data_version +=
>  			sub->sub_io->u.ci_data_version.dv_data_version;
> 
> 
>