linux-kernel - Re: [PATCH v2] ext4: fix to report fstrim.minlen back to userspace

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Message-ID: <4f0d6bd4-f393-9879-37c2-2495db4506c9@kernel.org>
Date:   Mon, 5 Jun 2023 12:15:14 +0800
From:   Chao Yu <chao@...nel.org>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v2] ext4: fix to report fstrim.minlen back to userspace

Ping,

On 2023/4/21 17:39, Jan Kara wrote:
> On Thu 06-04-23 23:04:10, Chao Yu wrote:
>> Quoted from manual of fstrim(8):
>>
>> "-m, --minimum minimum-size
>> 	..., if it's smaller than the device's minimum, and report that
>> (fstrim_range.minlen) back to userspace."
>>
>> So this patch tries to report adjusted fstrim_range.minlen back to
>> userspace via FITRIM interface, if the value is smaller than device's
>> minimum discard granularity.
>>
>> Signed-off-by: Chao Yu <chao@...nel.org>
> 
> Looks good to me. Feel free to add:
> 
> Reviewed-by: Jan Kara <jack@...e.cz>
> 
> 								Honza
> 
>> ---
>> v2:
>> - fix the wrong calculation of range->minlen.
>>   fs/ext4/mballoc.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
>> index d8b9d6a83d1e..4af51a16fc64 100644
>> --- a/fs/ext4/mballoc.c
>> +++ b/fs/ext4/mballoc.c
>> @@ -6491,6 +6491,10 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
>>   				discard_granularity >> sb->s_blocksize_bits);
>>   		if (minlen > EXT4_CLUSTERS_PER_GROUP(sb))
>>   			goto out;
>> +
>> +		/* Report adjusted minlen back to userspace */
>> +		range->minlen = EXT4_C2B(EXT4_SB(sb), minlen) <<
>> +						sb->s_blocksize_bits;
>>   	}
>>   	if (end >= max_blks - 1) {
>>   		end = max_blks - 1;
>> -- 
>> 2.25.1
>>