linux-kernel - Re: [PATCH v14 03/10] fs: Export alloc_empty_backing

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Message-ID: <20260112-renitent-mitbringen-e94874417a07@brauner>
Date: Mon, 12 Jan 2026 10:10:33 +0100
From: Christian Brauner <brauner@...nel.org>
To: Hongbo Li <lihongbo22@...wei.com>
Cc: hsiangkao@...ux.alibaba.com, chao@...nel.org, djwong@...nel.org, 
	amir73il@...il.com, hch@....de, linux-fsdevel@...r.kernel.org, 
	linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v14 03/10] fs: Export alloc_empty_backing_file

On Fri, Jan 09, 2026 at 10:28:49AM +0000, Hongbo Li wrote:
> There is no need to open nonexistent real files if backing files
> couldn't be backed by real files (e.g., EROFS page cache sharing
> doesn't need typical real files to open again).
> 
> Therefore, we export the alloc_empty_backing_file() helper, allowing
> filesystems to dynamically set the backing file without real file
> open. This is particularly useful for obtaining the correct @path
> and @inode when calling file_user_path() and file_user_inode().
> 
> Signed-off-by: Hongbo Li <lihongbo22@...wei.com>
> Reviewed-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
> Acked-by: Amir Goldstein <amir73il@...il.com>
> ---

Acked-by: Christian Brauner <brauner@...nel.org>