linux-kernel - Re: linux-next: build failure after merge of the vfs-brauner tree

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Date:   Mon, 2 Oct 2023 13:21:42 +0200
From:   Jan Kara <jack@...e.cz>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Christian Brauner <brauner@...nel.org>,
        Kent Overstreet <kent.overstreet@...ux.dev>,
        Jan Kara <jack@...e.cz>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the vfs-brauner tree

Hi!

On Thu 28-09-23 10:54:43, Stephen Rothwell wrote:
> After merging the vfs-brauner tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
> 
> fs/bcachefs/super-io.c: In function 'bch2_free_super':
> fs/bcachefs/super-io.c:166:17: error: implicit declaration of function 'blkdev_put'; did you mean 'bdi_put'? [-Werror=implicit-function-declaration]
>   166 |                 blkdev_put(sb->bdev, sb->holder);
>       |                 ^~~~~~~~~~
>       |                 bdi_put
> fs/bcachefs/super-io.c: In function 'bch2_read_super':
> fs/bcachefs/super-io.c:687:20: error: implicit declaration of function 'blkdev_get_by_path'; did you mean 'bdev_open_by_path'? [-Werror=implicit-function-declaration]
>   687 |         sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
>       |                    ^~~~~~~~~~~~~~~~~~
>       |                    bdev_open_by_path
> fs/bcachefs/super-io.c:687:18: error: assignment to 'struct block_device *' from 'int' makes pointer from integer without a cast [-Werror=int-conversion]
>   687 |         sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
>       |                  ^
> fs/bcachefs/super-io.c:693:26: error: assignment to 'struct block_device *' from 'int' makes pointer from integer without a cast [-Werror=int-conversion]
>   693 |                 sb->bdev = blkdev_get_by_path(path, sb->mode, sb->holder, &bch2_sb_handle_bdev_ops);
>       |                          ^
> cc1: all warnings being treated as errors
> 
> Caused by commit
> 
>   953863a5a2ff ("block: Remove blkdev_get_by_*() functions")
> 
> interacting with commit(s) from the bcachefs tree.
> 
> I would have reverted that commit for today, except I used the old
> vfs-brauner tree due to another build failure.  Can we just delay this
> one commit until after bcachefs has been converted (and any other
> references that may be added are fixed)?

Yeah, I guess removing the final commit is the easiest solution at this
point. It complicates a bit the series to disallow writing to mounted block
devices which bases on this - either I have to pospone that to the next
cycle after we convert bcachefs or I have to find a way for the old
blkdev_get_by_path() API and the new functionality to coexist. I'll think
about that.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR