linux-kernel - Re: [RFC PATCH] fs: fuse: add backing

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Message-ID: <CAOQ4uxg=HvoGFV+WerJcuD-qMyr-9fTBRA_+ZQRejodtBd0mnA@mail.gmail.com>
Date: Wed, 7 May 2025 20:38:45 +0200
From: Amir Goldstein <amir73il@...il.com>
To: Chen Linxuan <chenlinxuan@...ontech.com>
Cc: Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] fs: fuse: add backing_files control file

On Wed, May 7, 2025 at 7:03 PM Chen Linxuan <chenlinxuan@...ontech.com> wrote:
>
> On Thu, May 8, 2025 at 12:57 AM Amir Goldstein <amir73il@...il.com> wrote:
>
> > It means everything to userspace.
> > backing ids are part of the userspace UAPI - you have documented it yourself.
> > The fuse server used backing ids to manage access to backing files
> > https://github.com/libfuse/libfuse/blob/master/example/passthrough_hp.cc#L855
>
> Oh, I see.

For the record, I mean to print the same format as io_uring:
                        seq_printf(m, "%5u: ", id);
                        seq_file_path(m, f, " \t\n\\");
                        seq_puts(m, "\n");

Thanks,
Amir.