linux-kernel - Re: [f2fs-dev] [PATCH v3 3/6] f2fs: compress: fix to check unreleased compressed cluster

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Date: Wed, 10 Jan 2024 17:18:01 -0800
From: Daeho Jeong <daeho43@...il.com>
To: Chao Yu <chao@...nel.org>
Cc: jaegeuk@...nel.org, linux-kernel@...r.kernel.org, 
	linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH v3 3/6] f2fs: compress: fix to check unreleased
 compressed cluster

On Thu, Dec 28, 2023 at 6:33 AM Chao Yu <chao@...nel.org> wrote:
>
> From: Sheng Yong <shengyong@...o.com>
>
> Compressed cluster may not be released due to we can fail in
> release_compress_blocks(), fix to handle reserved compressed
> cluster correctly in reserve_compress_blocks().
>
> Fixes: 4c8ff7095bef ("f2fs: support data compression")
> Signed-off-by: Sheng Yong <shengyong@...o.com>
> Signed-off-by: Chao Yu <chao@...nel.org>
> ---
>  fs/f2fs/file.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 026d05a7edd8..782ae3be48f6 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -3624,6 +3624,15 @@ static int reserve_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
>                                 goto next;
>                         }
>
> +                       /*
> +                        * compressed cluster was not released due to
> +                        * it fails in release_compress_blocks().
> +                        */
> +                       if (blkaddr == NEW_ADDR) {
> +                               compr_blocks++;
> +                               continue;
> +                       }
> +
>                         if (__is_valid_data_blkaddr(blkaddr)) {
>                                 compr_blocks++;
>                                 continue;

How about merging two conditions like "blkaddr == NEW_ADDR ||
__is_valid_data_blkaddr(blkaddr)"?

> @@ -3633,6 +3642,9 @@ static int reserve_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
>                 }
>
>                 reserved = cluster_size - compr_blocks;
> +               if (!reserved)
> +                       goto next;
> +

How can the reserved variable be zero?

>                 ret = inc_valid_block_count(sbi, dn->inode, &reserved);
>                 if (ret)
>                         return ret;
> --
> 2.40.1
>
>
>
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