linux-kernel - Re: [f2fs-dev] [PATCH 2/2] f2fs: remove unnecessary block size check in init_f2fs

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Message-ID: <235d9db4-2ca5-4d7a-bd2a-36f98d1880a9@kernel.org>
Date: Fri, 26 Apr 2024 17:37:07 +0800
From: Chao Yu <chao@...nel.org>
To: Zhiguo Niu <niuzhiguo84@...il.com>
Cc: jaegeuk@...nel.org, linux-kernel@...r.kernel.org,
 linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: remove unnecessary block size check
 in init_f2fs_fs()

On 2024/4/16 19:12, Zhiguo Niu wrote:
> On Tue, Apr 16, 2024 at 3:22 PM Chao Yu <chao@...nel.org> wrote:
>>
>> After commit d7e9a9037de2 ("f2fs: Support Block Size == Page Size"),
>> F2FS_BLKSIZE equals to PAGE_SIZE, remove unnecessary check condition.
>>
>> Signed-off-by: Chao Yu <chao@...nel.org>
>> ---
>>   fs/f2fs/super.c | 6 ------
>>   1 file changed, 6 deletions(-)
>>
>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>> index 6d1e4fc629e2..32aa6d6fa871 100644
>> --- a/fs/f2fs/super.c
>> +++ b/fs/f2fs/super.c
>> @@ -4933,12 +4933,6 @@ static int __init init_f2fs_fs(void)
>>   {
>>          int err;
>>
>> -       if (PAGE_SIZE != F2FS_BLKSIZE) {
>> -               printk("F2FS not supported on PAGE_SIZE(%lu) != BLOCK_SIZE(%lu)\n",
>> -                               PAGE_SIZE, F2FS_BLKSIZE);
>> -               return -EINVAL;
>> -       }
>> -
>>          err = init_inodecache();
>>          if (err)
>>                  goto fail;
> Dear Chao,
> 
> Can you help modify the following  comment msg together with this patch?
> They are also related to commit d7e9a9037de2 ("f2fs: Support Block
> Size == Page Size").
> If you think there is a more suitable description, please help modify
> it directly.

Zhiguo,

I missed to reply this, I guess you can update
"f2fs: fix some ambiguous comments".

> thanks！
> 
> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
> index a357287..241e7b18 100644
> --- a/include/linux/f2fs_fs.h
> +++ b/include/linux/f2fs_fs.h
> @@ -394,7 +394,8 @@ struct f2fs_nat_block {
> 
>   /*
>    * F2FS uses 4 bytes to represent block address. As a result, supported size of
> - * disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.
> + * disk is 16 TB for a 4K page size and 64 TB for a 16K page size and it equals

disk is 16 TB for 4K size block and 64 TB for 16K size block and it equals
to (1 << 32) / 512 segments.

#define F2FS_MAX_SEGMENT       		((1 << 32) / 512)

Thanks,

> + * to 16 * 1024 * 1024 / 2 segments.
>    */
>   #define F2FS_MAX_SEGMENT       ((16 * 1024 * 1024) / 2)
> 
> @@ -424,8 +425,10 @@ struct f2fs_sit_block {
>   /*
>    * For segment summary
>    *
> - * One summary block contains exactly 512 summary entries, which represents
> - * exactly one segment by default. Not allow to change the basic units.
> + * One summary block with 4KB size contains exactly 512 summary entries, which
> + * represents exactly one segment with 2MB size.
> + * Similarly, in the case of 16k block size, it represents one
> segment with 8MB size.
> + * Not allow to change the basic units.
>    *
>    * NOTE: For initializing fields, you must use set_summary
>    *
> @@ -556,6 +559,7 @@ struct f2fs_summary_block {
> 
>   /*
>    * space utilization of regular dentry and inline dentry (w/o extra
> reservation)
> + * when block size is 4KB.
> 
> 
> 
>> --
>> 2.40.1
>>
>>
>>
>> _______________________________________________
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>> Linux-f2fs-devel@...ts.sourceforge.net
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