linux-kernel - Re: [PATCH 2/2] erofs: enable large folio support for non-compressed format

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Date:   Sat, 26 Nov 2022 10:50:19 +0800
From:   Jingbo Xu <jefflexu@...ux.alibaba.com>
To:     xiang@...nel.org, chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] erofs: enable large folio support for non-compressed
 format



On 11/26/22 10:16 AM, Gao Xiang wrote:
> Hi Jingbo,
> 
> On Sat, Nov 26, 2022 at 08:57:56AM +0800, Jingbo Xu wrote:
>> Enable large folio in both device and fscache mode.  Then the readahead
> 
>          ^ large folios in both iomap and fscache modes.
> 
> I tend to enable iomap/fscache large folios with two patches.
> Also please see dev-test branch.

Got it.


> 
> 
>> routine will pass down large folio containing multiple pages.
>>
>> Enable this feature for non-compressed format for now, until the
>> compression part supports large folio later.
> 
>                             ^ large folios
> 
>>
>> Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
>> ---
>>  fs/erofs/fscache.c | 1 +
>>  fs/erofs/inode.c   | 1 +
>>  2 files changed, 2 insertions(+)
>>
>> diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
>> index 0643b205c7eb..d2dd58ce312b 100644
>> --- a/fs/erofs/fscache.c
>> +++ b/fs/erofs/fscache.c
>> @@ -436,6 +436,7 @@ struct erofs_fscache *erofs_fscache_acquire_cookie(struct super_block *sb,
>>  		inode->i_size = OFFSET_MAX;
>>  		inode->i_mapping->a_ops = &erofs_fscache_meta_aops;
>>  		mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
>> +		mapping_set_large_folios(inode->i_mapping);
>>  
> 
> Meta inodes currently doesn't need large folios for now, and
> we don't have readahead policy for these.

Alright, I will fix this in a quick v2.

> 
>>  		ctx->inode = inode;
>>  	}
>> diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c
>> index ad2a82f2eb4c..85932086d23f 100644
>> --- a/fs/erofs/inode.c
>> +++ b/fs/erofs/inode.c
>> @@ -295,6 +295,7 @@ static int erofs_fill_inode(struct inode *inode)
>>  		goto out_unlock;
>>  	}
>>  	inode->i_mapping->a_ops = &erofs_raw_access_aops;
>> +	mapping_set_large_folios(inode->i_mapping);
>>  #ifdef CONFIG_EROFS_FS_ONDEMAND
>>  	if (erofs_is_fscache_mode(inode->i_sb))
>>  		inode->i_mapping->a_ops = &erofs_fscache_access_aops;
>> -- 
>> 2.19.1.6.gb485710b
>>

-- 
Thanks,
Jingbo