linux-kernel - Re: [PATCH v10 03/10] fs: Export alloc_empty_backing

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Message-ID: <e143fe52-d704-46d3-9389-21645bb19059@linux.alibaba.com>
Date: Tue, 23 Dec 2025 16:31:42 +0800
From: Gao Xiang <hsiangkao@...ux.alibaba.com>
To: Hongbo Li <lihongbo22@...wei.com>, Amir Goldstein <amir73il@...il.com>
Cc: linux-fsdevel@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org, Chao Yu <chao@...nel.org>,
 Christian Brauner <brauner@...nel.org>, "Darrick J. Wong"
 <djwong@...nel.org>, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v10 03/10] fs: Export alloc_empty_backing_file

On 2025/12/23 09:56, 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>

(I hope Amir could ack this particular patch too..)

Thanks,
Gao Xiang