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Re: [PATCH RFC v2 for-6.8/block 01/18] block: add some bdev apis
- To: Jan Kara <jack@xxxxxxx>, Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>
- From: Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>
- Date: Tue, 12 Dec 2023 09:25:24 +0800
- Cc: axboe@xxxxxxxxx, roger.pau@xxxxxxxxxx, colyli@xxxxxxx, kent.overstreet@xxxxxxxxx, joern@xxxxxxxxxxxxxxx, miquel.raynal@xxxxxxxxxxx, richard@xxxxxx, vigneshr@xxxxxx, sth@xxxxxxxxxxxxx, hoeppner@xxxxxxxxxxxxx, hca@xxxxxxxxxxxxx, gor@xxxxxxxxxxxxx, agordeev@xxxxxxxxxxxxx, jejb@xxxxxxxxxxxxx, martin.petersen@xxxxxxxxxx, clm@xxxxxx, josef@xxxxxxxxxxxxxx, dsterba@xxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, brauner@xxxxxxxxxx, nico@xxxxxxxxxxx, xiang@xxxxxxxxxx, chao@xxxxxxxxxx, tytso@xxxxxxx, adilger.kernel@xxxxxxxxx, agruenba@xxxxxxxxxx, jack@xxxxxxxx, konishi.ryusuke@xxxxxxxxx, willy@xxxxxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, p.raghav@xxxxxxxxxxx, hare@xxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-bcache@xxxxxxxxxxxxxxx, linux-mtd@xxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, linux-bcachefs@xxxxxxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-erofs@xxxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, gfs2@xxxxxxxxxxxxxxx, linux-nilfs@xxxxxxxxxxxxxxx, yi.zhang@xxxxxxxxxx, yangerkun@xxxxxxxxxx, "yukuai (C)" <yukuai3@xxxxxxxxxx>
- Delivery-date: Tue, 12 Dec 2023 01:25:49 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi,
在 2023/12/12 0:52, Jan Kara 写道:
On Mon 11-12-23 22:05:35, Yu Kuai wrote:
From: Yu Kuai <yukuai3@xxxxxxxxxx>
Those apis will be used for other modules, so that bd_inode won't be
accessed directly from other modules.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
...
+void bdev_associated_mapping(struct block_device *bdev,
+ struct address_space *mapping)
+{
+ mapping->host = bdev->bd_inode;
+}
Here I'm not sure - is the helper really a win? It seems a bit obscure to
me. This initialization of another mapping for a bdev looks really special.
Yes, I don't like this helper at all, but gfs2 is used this way, and I
need this helper to remove 'bd_inode' from block_devcie later. I'm not
familiar with gfs2 at all but perhaps it worth to dig deeper and figure
out a proper way for gfs2.
Thanks,
Kuai
Honza
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