linux-kernel - Re: [PATCH AUTOSEL 5.11 54/67] btrfs: make btrfs_start_delalloc

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Message-ID: <YEFeNKXQ7FsUoJrt@sashalap>
Date:   Thu, 4 Mar 2021 17:24:52 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     dsterba@...e.cz, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Nikolay Borisov <nborisov@...e.com>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.11 54/67] btrfs: make
 btrfs_start_delalloc_root's nr argument a long

On Wed, Feb 24, 2021 at 07:09:42PM +0100, David Sterba wrote:
>On Wed, Feb 24, 2021 at 07:50:12AM -0500, Sasha Levin wrote:
>> From: Nikolay Borisov <nborisov@...e.com>
>>
>> [ Upstream commit 9db4dc241e87fccd8301357d5ef908f40b50f2e3 ]
>>
>> It's currently u64 which gets instantly translated either to LONG_MAX
>> (if U64_MAX is passed) or cast to an unsigned long (which is in fact,
>> wrong because writeback_control::nr_to_write is a signed, long type).
>>
>> Just convert the function's argument to be long time which obviates the
>> need to manually convert u64 value to a long. Adjust all call sites
>> which pass U64_MAX to pass LONG_MAX. Finally ensure that in
>> shrink_delalloc the u64 is converted to a long without overflowing,
>> resulting in a negative number.
>
>This patch is a cleanup and I don't see any other patch depend on it, so
>please drop it from autosel.

I'll drop it, thanks!

-- 
Thanks,
Sasha