From: "hch@infradead.org" <hch@infradead.org>
To: Trond Myklebust <trondmy@hammerspace.com>
Cc: "hch@infradead.org" <hch@infradead.org>,
"jack@suse.cz" <jack@suse.cz>,
"chuck.lever@oracle.com" <chuck.lever@oracle.com>,
"linux-api@vger.kernel.org" <linux-api@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"brauner@kernel.org" <brauner@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"alex.aring@gmail.com" <alex.aring@gmail.com>,
"cyphar@cyphar.com" <cyphar@cyphar.com>,
"viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
"jlayton@kernel.org" <jlayton@kernel.org>,
"amir73il@gmail.com" <amir73il@gmail.com>,
"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>
Subject: Re: [PATCH RFC v2] fhandle: expose u64 mount id to name_to_handle_at(2)
Date: Mon, 27 May 2024 09:29:48 -0700 [thread overview]
Message-ID: <ZlS0_DWzGk24GYZA@infradead.org> (raw)
In-Reply-To: <86065f6a4f3d2f3d78f39e7a276a2d6e25bfbc9d.camel@hammerspace.com>
On Mon, May 27, 2024 at 03:38:40PM +0000, Trond Myklebust wrote:
> > It
> > does not matter what mount you use to access it.
>
> Sure. However if you are providing a path argument, then presumably you
> need to know which file system (aka super_block) it eventually resolves
> to.
Except that you can't, at least not without running into potential
races. The only way to fix a race vs unmount/remount is to include
the fsid part in the kernel generated file handle.
>
> If your use case isn't NFS servers, then what use case are you
> targeting, and how do you expect those applications to use this API?
The main user of the open by handle syscalls seems to be fanotify
magic.
next prev parent reply other threads:[~2024-05-27 16:29 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-23 20:57 [PATCH RFC v2] fhandle: expose u64 mount id to name_to_handle_at(2) Aleksa Sarai
2024-05-24 4:58 ` Amir Goldstein
2024-05-26 9:25 ` Christoph Hellwig
2024-05-26 19:01 ` Aleksa Sarai
2024-05-27 11:47 ` Christoph Hellwig
2024-05-27 12:29 ` Christian Brauner
2024-05-27 13:17 ` Christian Brauner
2024-05-27 15:47 ` Trond Myklebust
2024-05-28 7:05 ` Christian Brauner
2024-05-27 16:18 ` Christoph Hellwig
2024-05-27 13:34 ` Jan Kara
2024-05-27 16:24 ` Christoph Hellwig
2024-05-28 8:20 ` Christian Brauner
2024-05-28 8:28 ` Christoph Hellwig
2024-05-28 9:17 ` Christian Brauner
2024-05-28 10:55 ` Christoph Hellwig
2024-05-28 12:04 ` Christian Brauner
2024-05-28 13:22 ` Christoph Hellwig
2024-05-28 13:28 ` Miklos Szeredi
2024-05-29 6:34 ` Christoph Hellwig
2024-06-01 8:12 ` Aleksa Sarai
2024-06-03 10:30 ` Jan Kara
2024-06-04 5:22 ` Christoph Hellwig
2024-05-29 7:40 ` Christian Brauner
2024-05-31 8:14 ` Christoph Hellwig
2024-05-31 10:28 ` Christian Brauner
2024-05-26 22:32 ` Trond Myklebust
2024-05-27 11:49 ` hch
2024-05-27 15:38 ` Trond Myklebust
2024-05-27 16:29 ` hch [this message]
2024-05-28 7:12 ` Christian Brauner
2024-05-28 7:15 ` hch
2024-05-28 10:11 ` Jan Kara
2024-05-28 10:56 ` hch
2024-05-28 23:25 ` Dave Chinner
2024-05-29 6:24 ` hch
2024-05-29 7:23 ` Amir Goldstein
2024-05-27 12:22 ` Christian Brauner
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