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Date: Mon, 27 Nov 2023 21:07:22 +0800
From: Yu Kuai <>
To: Christoph Hellwig <>, Yu Kuai <>
Cc:,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, "yukuai (C)" <>
Subject: Re: [PATCH block/for-next v2 01/16] block: add a new helper to get
 inode from block_device


在 2023/11/27 15:21, Christoph Hellwig 写道:
> On Mon, Nov 27, 2023 at 02:21:01PM +0800, Yu Kuai wrote:
>> From: Yu Kuai <>
>> block_devcie is allocated from bdev_alloc() by bdev_alloc_inode(), and
>> currently block_device contains a pointer that point to the address of
>> inode, while such inode is allocated together:
> This is going the wrong way.  Nothing outside of core block layer code
> should ever directly use the bdev inode.  We've been rather sloppy
> and added a lot of direct reference to it, but they really need to
> go away and be replaced with well defined high level operation on
> struct block_device.  Once that is done we can remove the bd_inode
> pointer, but replacing it with something that pokes even more deeply
> into bdev internals is a bad idea.

Thanks for the advice, however, after collecting how other modules are
using bdev inode, I got two main questions:

1) Is't okay to add a new helper to pass in bdev for following apis?
If so, then almost all the fs and driver can avoid to access bd_inode

errseq_check(&bdev->bd_inode->i_mapping->wb_err, wb_err);
errseq_check_and_advance(&bdev->bd_inode->i_mapping->wb_err, &wb_err);
mapping_gfp_constraint(bdev->bd_inode->i_mapping, gfp);
find_get_page(bdev->bd_inode->i_mapping, offset);
find_or_create_page(bdev->bd_inode->i_mapping, index, gfp);
read_cache_page_gfp(bdev->bd_inode->i_mapping, index, gfp);
invalidate_inode_pages2_range(bdev->bd_inode->i_mapping, start, end);
read_mapping_folio(bdev->bd_inode->i_mapping, index, file);
read_mapping_page(bdev->bd_inode->i_mapping, index, file);
file_ra_state_init(ra, bdev->bd_inode->i_mapping);
page_cache_sync_readahead(bdev->bd_inode->i_mapping, ra, file, index, 

2) For the file fs/buffer.c, there are some special usage like
following that I don't think it's good to add a helper:


Is't okay to move following apis from fs/buffer.c directly to



> .

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