linux-kernel - Re: [Linux-cachefs] [PATCH v5 17/22] erofs: implement fscache-based data read for non-inline layout

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Message-ID: <a8be4038-720f-d604-03fc-f958e9083680@linux.alibaba.com>
Date:   Fri, 18 Mar 2022 13:29:23 +0800
From:   JeffleXu <jefflexu@...ux.alibaba.com>
To:     dhowells@...hat.com, linux-cachefs@...hat.com, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        gregkh@...uxfoundation.org, tao.peng@...ux.alibaba.com,
        willy@...radead.org, linux-kernel@...r.kernel.org,
        joseph.qi@...ux.alibaba.com, bo.liu@...ux.alibaba.com,
        linux-fsdevel@...r.kernel.org, luodaowen.backend@...edance.com,
        eguan@...ux.alibaba.com, gerry@...ux.alibaba.com,
        torvalds@...ux-foundation.org
Subject: Re: [Linux-cachefs] [PATCH v5 17/22] erofs: implement fscache-based
 data read for non-inline layout



On 3/17/22 2:18 PM, Gao Xiang wrote:
> On Wed, Mar 16, 2022 at 09:17:18PM +0800, Jeffle Xu wrote:
>> This patch implements the data plane of reading data from bootstrap blob
>> file over fscache for non-inline layout.
>>
>> Be noted that compressed layout is not supported yet.
>>
>> Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
>> ---
>>  fs/erofs/fscache.c  | 94 +++++++++++++++++++++++++++++++++++++++++++++
>>  fs/erofs/inode.c    |  6 ++-
>>  fs/erofs/internal.h |  1 +
>>  3 files changed, 100 insertions(+), 1 deletion(-)
>>
>> diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
>> index 654414aa87ad..df56562f33c4 100644
>> --- a/fs/erofs/fscache.c
>> +++ b/fs/erofs/fscache.c
>> @@ -4,6 +4,12 @@
>>   */
>>  #include "internal.h"
>>  
>> +struct erofs_fscache_map {
>> +	struct erofs_fscache_context *m_ctx;
>> +	erofs_off_t m_pa, m_la, o_la;
>> +	u64 m_llen;
> 
> Can we directly use "struct erofs_map_blocks map"?
> So "erofs_fscache_get_map" can be avoided then.

OK, the extra fields will be folded into "struct erofs_map_blocks map".

-- 
Thanks,
Jeffle