linux-kernel - Re: [PATCH] f2fs: increase the limit for reserve

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Message-ID: <YwWMavPwLhAcUklv@google.com>
Date:   Tue, 23 Aug 2022 19:26:50 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH] f2fs: increase the limit for reserve_root

On 08/23, Jaegeuk Kim wrote:
> This patch increases the threshold that limits the reserved root space from 0.2%
> to 12.5% by using simple shift operation.
> 
> Typically Android sets 128MB, but if the storage capacity is 32GB, 0.2% which is
> around 64MB becomes too small. Let's relax it.
> 

Added:

Reported-by: Aran Dalton <arda@...winnertech.com>

Thanks,

> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> ---
>  fs/f2fs/super.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 09972b709cdd..d1b4de5b4083 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -301,10 +301,10 @@ static void f2fs_destroy_casefold_cache(void) { }
>  
>  static inline void limit_reserve_root(struct f2fs_sb_info *sbi)
>  {
> -	block_t limit = min((sbi->user_block_count << 1) / 1000,
> +	block_t limit = min((sbi->user_block_count >> 3),
>  			sbi->user_block_count - sbi->reserved_blocks);
>  
> -	/* limit is 0.2% */
> +	/* limit is 12.5% */
>  	if (test_opt(sbi, RESERVE_ROOT) &&
>  			F2FS_OPTION(sbi).root_reserved_blocks > limit) {
>  		F2FS_OPTION(sbi).root_reserved_blocks = limit;
> -- 
> 2.37.1.595.g718a3a8f04-goog