Re: [PATCH block/for-next v2 07/16] bcachefs: use new helper to get inode from block_device

From: Yu Kuai <yukuai1@huaweicloud.com>
To: Kent Overstreet <kent.overstreet@linux.dev>,
	Damien Le Moal <dlemoal@kernel.org>
Cc: Yu Kuai <yukuai1@huaweicloud.com>,
	hch@infradead.org, ming.lei@redhat.com, axboe@kernel.dk,
	roger.pau@citrix.com, colyli@suse.de, kent.overstreet@gmail.com,
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	yangerkun@huawei.com, "yukuai (C)" <yukuai3@huawei.com>
Subject: Re: [PATCH block/for-next v2 07/16] bcachefs: use new helper to get inode from block_device
Date: Mon, 27 Nov 2023 15:52:39 +0800	[thread overview]
Message-ID: <58ced33e-0a8c-7bd3-beb8-d75119cab60b@huaweicloud.com> (raw)
In-Reply-To: <20231127072409.y22jkynrchm4tkd2@moria.home.lan>

Hi,

在 2023/11/27 15:24, Kent Overstreet 写道:
> On Mon, Nov 27, 2023 at 04:09:47PM +0900, Damien Le Moal wrote:
>> On 11/27/23 15:21, Yu Kuai wrote:
>>> From: Yu Kuai <yukuai3@huawei.com>
>>>
>>> Which is more efficiency, and also prepare to remove the field
>>> 'bd_inode' from block_device.
>>>
>>> Signed-off-by: Yu Kuai <yukuai3@huawei.com>
>>> ---
>>>   fs/bcachefs/util.h | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/fs/bcachefs/util.h b/fs/bcachefs/util.h
>>> index 2984b57b2958..fe7ccb3a3517 100644
>>> --- a/fs/bcachefs/util.h
>>> +++ b/fs/bcachefs/util.h
>>> @@ -518,7 +518,7 @@ int bch2_bio_alloc_pages(struct bio *, size_t, gfp_t);
>>>   
>>>   static inline sector_t bdev_sectors(struct block_device *bdev)
>>>   {
>>> -	return bdev->bd_inode->i_size >> 9;
>>> +	return bdev_inode(bdev)->i_size >> 9;
>>
>> shouldn't this use i_size_read() ?
>>
>> I missed the history with this but why not use bdev_nr_sectors() and delete this
>> helper ?
> 
> Actually, this helper seems to be dead code.

Yes, there is no caller of this helper, I'll remove this helper.

Thanks,
Kuai

> .
> 