linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: keep scanning until enough free nids are acquired

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Message-ID: <ff5a93ff-1046-182d-627c-a3a2efa3bfd6@huawei.com>
Date:   Tue, 7 Nov 2017 13:45:52 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Fan Li <fanofcode.li@...sung.com>, 'Chao Yu' <chao@...nel.org>,
        "'Jaegeuk Kim'" <jaegeuk@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH] f2fs: keep scanning until enough free nids are
 acquired

On 2017/11/7 11:04, Fan Li wrote:
> In current version, after scan_free_nid_bits, the scan is over if nid_cnt[FREE_NID] != 0.
> In most cases, there are still free nids in the free list during the scan, and scan_free_nid_bits
> usually can't increase nid_cnt[FREE_NID].
> It causes that __build_free_nids is called many times without solving the shortage
> of the free nids. This patch fixes that.
> 
> Signed-off-by: Fan li <fanofcode.li@...sung.com>

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,

> ---
>  fs/f2fs/node.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index 3d0d1be..5cef118 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -2010,7 +2010,7 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
>                 /* try to find free nids in free_nid_bitmap */
>                 scan_free_nid_bits(sbi);
> 
> -               if (nm_i->nid_cnt[FREE_NID])
> +               if (nm_i->nid_cnt[FREE_NID] >= NAT_ENTRY_PER_BLOCK)
>                         return;
>         }
> 
> --
> 2.7.4
> 
> 
>