linux-kernel - Re: [PATCH] btrfs: change mount

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Message-ID: <20240719132454.GL8022@suse.cz>
Date: Fri, 19 Jul 2024 15:24:54 +0200
From: David Sterba <dsterba@...e.cz>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
	David Sterba <dsterba@...e.com>, Qu Wenruo <wqu@...e.com>,
	Arnd Bergmann <arnd@...db.de>, Filipe Manana <fdmanana@...e.com>,
	Johannes Thumshirn <johannes.thumshirn@....com>,
	Anand Jain <anand.jain@...cle.com>,
	Christian Brauner <brauner@...nel.org>,
	Naohiro Aota <naohiro.aota@....com>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] btrfs: change mount_opt to u64

On Fri, Jul 19, 2024 at 12:37:06PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The newly added BTRFS_MOUNT_IGNORESUPERFLAGS flag does not fit into a 32-bit
> flags word, as shown by this warning on 32-bit architectures:
> 
> fs/btrfs/super.c: In function 'btrfs_check_options':
> fs/btrfs/super.c:666:48: error: conversion from 'enum <anonymous>' to 'long unsigned int' changes value from '4294967296' to '0' [-Werror=overflow]
>   666 |              check_ro_option(info, *mount_opt, BTRFS_MOUNT_IGNORESUPERFLAGS, "ignoresuperflags")))
>       |                                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Change all interfaces that deal with mount flags to use a 64-bit type
> on all architectures instead.
> 
> Fixes: 32e6216512b4 ("btrfs: introduce new "rescue=ignoresuperflags" mount option")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ----
> Please double-check that I got all the instances. I only looked at where the
> obvious users are, but did not actually try to run this on a 32-bit target

Thanks, the build issue is known and fix will be sent in 2nd pull
reuqest on Monday.