linux-kernel - Re: [PATCH 1/2] fs: avoid fdput() after failed fdget() in ksys_sync_file

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Message-ID: <20200508000509.GK23230@ZenIV.linux.org.uk>
Date:   Fri, 8 May 2020 01:05:09 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     axboe@...nel.dk, zohar@...ux.vnet.ibm.com, mcgrof@...nel.org,
        keescook@...omium.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] fs: avoid fdput() after failed fdget() in
 ksys_sync_file_range()

On Thu, May 07, 2020 at 05:57:09PM -0600, Shuah Khan wrote:
> Fix ksys_sync_file_range() to avoid fdput() after a failed fdget().
> fdput() doesn't do fput() on this file since FDPUT_FPUT isn't set
> in fd.flags. Fix it anyway since failed fdget() doesn't require
> a fdput().
> 
> This was introdcued in a commit to add sync_file_range() helper.

Er...  What's the point microoptimizing the slow path here?