linux-kernel - Re: [f2fs-dev] [RFC PATCH v5] f2fs: support data compression

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Date:   Sat, 11 Jan 2020 10:02:00 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [RFC PATCH v5] f2fs: support data compression

On 01/11, Chao Yu wrote:
> On 2020/1/11 7:52, Jaegeuk Kim wrote:
> > On 01/06, Jaegeuk Kim wrote:
> >> On 01/06, Chao Yu wrote:
> >>> On 2020/1/3 14:50, Chao Yu wrote:
> >>>> This works to me. Could you run fsstress tests on compressed root directory?
> >>>> It seems still there are some bugs.
> >>>
> >>> Jaegeuk,
> >>>
> >>> Did you mean running por_fsstress testcase?
> >>>
> >>> Now, at least I didn't hit any problem for normal fsstress case.
> >>
> >> Yup. por_fsstress
> > 
> > Please check https://github.com/jaegeuk/f2fs/commits/g-dev-test.
> > I've fixed
> > - truncation offset
> > - i_compressed_blocks and its lock coverage
> > - error handling
> > - etc
> 
> I changed as below, and por_fsstress stops panic the system.
> 
> Could you merge all these fixes into original patch?

Yup, let m roll up some early patches first once test results become good.

> 
> >From bb17d7d77fe0b8a3e3632a7026550800ab9609e9 Mon Sep 17 00:00:00 2001
> From: Chao Yu <yuchao0@...wei.com>
> Date: Sat, 11 Jan 2020 16:58:20 +0800
> Subject: [PATCH] f2fs: compress: fix f2fs_put_rpages_mapping()
> 
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
>  fs/f2fs/compress.c | 30 +++++++++++++++---------------
>  1 file changed, 15 insertions(+), 15 deletions(-)
> 
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index 502cd0ddc2a7..5c6a31d84ce4 100644
> --- a/fs/f2fs/compress.c
> +++ b/fs/f2fs/compress.c
> @@ -74,18 +74,10 @@ static void f2fs_put_compressed_page(struct page *page)
>  }
> 
>  static void f2fs_drop_rpages(struct compress_ctx *cc,
> -		struct address_space *mapping, int len, bool unlock)
> +					int len, bool unlock)
>  {
>  	unsigned int i;
>  	for (i = 0; i < len; i++) {
> -		if (mapping) {
> -			pgoff_t start = start_idx_of_cluster(cc);
> -			struct page *page = find_get_page(mapping, start + i);
> -
> -			put_page(page);
> -			put_page(page);
> -			cc->rpages[i] = NULL;
> -		}
>  		if (!cc->rpages[i])
>  			continue;
>  		if (unlock)
> @@ -97,18 +89,25 @@ static void f2fs_drop_rpages(struct compress_ctx *cc,
> 
>  static void f2fs_put_rpages(struct compress_ctx *cc)
>  {
> -	f2fs_drop_rpages(cc, NULL, cc->cluster_size, false);
> +	f2fs_drop_rpages(cc, cc->cluster_size, false);
>  }
> 
>  static void f2fs_unlock_rpages(struct compress_ctx *cc, int len)
>  {
> -	f2fs_drop_rpages(cc, NULL, len, true);
> +	f2fs_drop_rpages(cc, len, true);
>  }
> 
>  static void f2fs_put_rpages_mapping(struct compress_ctx *cc,
> -				struct address_space *mapping, int len)
> +				struct address_space *mapping,
> +				pgoff_t start, int len)
>  {
> -	f2fs_drop_rpages(cc, mapping, len, false);
> +	int i;
> +	for (i = 0; i < len; i++) {
> +		struct page *page = find_get_page(mapping, start + i);
> +
> +		put_page(page);
> +		put_page(page);
> +	}
>  }
> 
>  static void f2fs_put_rpages_wbc(struct compress_ctx *cc,
> @@ -680,7 +679,8 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
> 
>  		if (!PageUptodate(page)) {
>  			f2fs_unlock_rpages(cc, i + 1);
> -			f2fs_put_rpages_mapping(cc, mapping, cc->cluster_size);
> +			f2fs_put_rpages_mapping(cc, mapping, start_idx,
> +					cc->cluster_size);
>  			f2fs_destroy_compress_ctx(cc);
>  			goto retry;
>  		}
> @@ -714,7 +714,7 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
>  unlock_pages:
>  	f2fs_unlock_rpages(cc, i);
>  release_pages:
> -	f2fs_put_rpages_mapping(cc, mapping, i);
> +	f2fs_put_rpages_mapping(cc, mapping, start_idx, i);
>  	f2fs_destroy_compress_ctx(cc);
>  	return ret;
>  }
> -- 
> 2.18.0.rc1
> 
> 
> 
> > 
> > One another fix in f2fs-tools as well.
> > https://github.com/jaegeuk/f2fs-tools
> > 
> >>
> >>>
> >>> Thanks,
> > .
> >