linux-kernel - Re: [PATCH 4/5] f2fs: disable small discard in lfs mode

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Message-ID: <f6cefb97-dc10-5c07-7a75-ab53a72f7a22@huawei.com>
Date:   Fri, 13 Jul 2018 11:39:45 +0800
From:   Yunlong Song <yunlong.song@...wei.com>
To:     Chao Yu <yuchao0@...wei.com>, <jaegeuk@...nel.org>,
        <chao@...nel.org>, <yunlong.song@...oud.com>
CC:     <miaoxie@...wei.com>, <bintian.wang@...wei.com>,
        <shengyong1@...wei.com>, <heyunlei@...wei.com>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] f2fs: disable small discard in lfs mode

How about change test_opt(sbi, LFS) to f2fs_sb_has_blkzoned(sbi->sb) in 
this patch, we apply
this patch to zoned block device?

On 2018/7/13 11:17, Chao Yu wrote:
> On 2018/7/12 23:09, Yunlong Song wrote:
>> In lfs mode, it is better to send the discard of the overall section
>> each time to avoid missing alignment with flash.
> Hmm.. I think LFS mode can be used widely on different kind of device instead of
> just on zoned block device, so let's just keep old implementation here.
>
> Thanks,
>
>> Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
>> ---
>>   fs/f2fs/segment.c | 3 ++-
>>   fs/f2fs/sysfs.c   | 4 ++++
>>   2 files changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>> index fd38b61..f6c20e0 100644
>> --- a/fs/f2fs/segment.c
>> +++ b/fs/f2fs/segment.c
>> @@ -1766,7 +1766,8 @@ static int create_discard_cmd_control(struct f2fs_sb_info *sbi)
>>   	atomic_set(&dcc->issing_discard, 0);
>>   	atomic_set(&dcc->discard_cmd_cnt, 0);
>>   	dcc->nr_discards = 0;
>> -	dcc->max_discards = MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
>> +	dcc->max_discards = test_opt(sbi, LFS) ? 0 :
>> +				MAIN_SEGS(sbi) << sbi->log_blocks_per_seg;
>>   	dcc->undiscard_blks = 0;
>>   	dcc->root = RB_ROOT;
>>   	dcc->rbtree_check = false;
>> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
>> index 2e7e611..4b6c457 100644
>> --- a/fs/f2fs/sysfs.c
>> +++ b/fs/f2fs/sysfs.c
>> @@ -271,6 +271,10 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
>>   		return count;
>>   	}
>>   
>> +	if (!strcmp(a->attr.name, "max_small_discards") &&
>> +		test_opt(sbi, LFS))
>> +		return -EINVAL;
>> +
>>   	*ui = t;
>>   
>>   	if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0)
>>
>
> .
>

-- 
Thanks,
Yunlong Song