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[100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 393B060131; Tue, 20 Jan 2026 13:21:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1CB2EC16AAE; Tue, 20 Jan 2026 13:21:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768915312; bh=f2qFmDHnAGeH2DQsfDbKX6ov0cXKUQc3FlYWkzQ0G+o=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=HArzV8jGiJF9EjuBcuhlJs4TShV4NxERmXFPUT+J8+gfAJ4DE490qIALJ076bILOb e408+yivjAyOomjEdqgF7pCaN/qMG9T58VsCZ+YqBNrLJMz+X7GC3/EKUmI1086fJz MjiZ9qewu5a5y2wbA741RboftmNGOHR283JnbrHlWH2I1F6Ud3GfwTl2MLTVOi85M3 vu6PPer10vwGTgfXrjWnVB6g2DP0q2XLjum5hcNA35pe4SEs/CtQqpZE1o1MPwISke 0OB6jpokJJJ+B9F86zTx8EgeG2ymAYs0Cvj1uS+q0lVb6LwtO5ZRJTXF9J9DnnB/xd V7CI25VZpkgCg== Message-ID: Subject: Re: [PATCH v2 02/31] exportfs: add new EXPORT_OP_STABLE_HANDLES flag From: Jeff Layton To: Christoph Hellwig Cc: Christian Brauner , Alexander Viro , Chuck Lever , NeilBrown , Olga Kornievskaia , Dai Ngo , Tom Talpey , Amir Goldstein , Hugh Dickins , Baolin Wang , Andrew Morton , Theodore Ts'o , Andreas Dilger , Jan Kara , Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Sandeep Dhavale , Hongbo Li , Chunhai Guo , Carlos Maiolino , Ilya Dryomov , Alex Markuze , Viacheslav Dubeyko , Chris Mason , David Sterba , Luis de Bethencourt , Salah Triki , Phillip Lougher , Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Bharath SM , Miklos Szeredi , Mike Marshall , Martin Brandenburg , Mark Fasheh , Joel Becker , Joseph Qi , Konstantin Komarov , Ryusuke Konishi , Trond Myklebust , Anna Schumaker , Dave Kleikamp , David Woodhouse , Richard Weinberger , Jan Kara , Andreas Gruenbacher , OGAWA Hirofumi , Jaegeuk Kim , Jonathan Corbet , David Laight , Dave Chinner , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-ext4@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-xfs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, linux-unionfs@vger.kernel.org, devel@lists.orangefs.org, ocfs2-devel@lists.linux.dev, ntfs3@lists.linux.dev, linux-nilfs@vger.kernel.org, jfs-discussion@lists.sourceforge.net, linux-mtd@lists.infradead.org, gfs2@lists.linux.dev, linux-f2fs-devel@lists.sourceforge.net, linux-doc@vger.kernel.org Date: Tue, 20 Jan 2026 08:21:45 -0500 In-Reply-To: References: <20260119-exportfs-nfsd-v2-0-d93368f903bd@kernel.org> <20260119-exportfs-nfsd-v2-2-d93368f903bd@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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 EnlMgni/ Vo8WQpBHNnBxc8rW3W9MoEcMVv08AZxbRebAk9maqPBHUrkav+729UAeZkf3bxMEE8pud5+4M/B538glou5B4dcFbnVJBTXDJeL0y77ETj+8RNpZHNSOQacm6VCO6pCd+eJfokC8YFTnFHKITIk7q26+V5h3uPtJ4iqL//VwbWSpEXqnjiJ8k0+RMhRcQONBwxJ66Mr0lpB3h4bwIwmy1hVb4R9BLtzG9wyNjYnihrKSNTPiR2v25ffadovjV9oeNu2QtxUcrfXtACCyqeaAv1rNy5TPh5knRZRIp04ahfoBLbmrPrvWcs/b0pdDY8lGqkIPj X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 2026-01-19 at 23:50 -0800, Christoph Hellwig wrote: > On Mon, Jan 19, 2026 at 11:26:19AM -0500, Jeff Layton wrote: > > + EXPORT_OP_STABLE_HANDLES - This filesystem provides filehandles that= are > > + stable across the lifetime of a file. This is a hard requirement f= or export > > + via nfsd. Any filesystem that is eligible to be exported via nfsd = must > > + indicate this guarantee by setting this flag. Most disk-based file= systems > > + can do this naturally. Pseudofilesystems that are for local report= ing and > > + control (e.g. kernfs, pidfs, nsfs) usually can't support this. >=20 > Suggested rewording, taking some of the ideas from Dave Chinners earlier > comments into account: >=20 > EXPORT_OP_STABLE_HANDLES - This filesystem provides filehandles that ar= e > stable across the lifetime of a file. A file in this context is an > instantiated inode reachable by one or more file names, or still open= after > the last name has been unlinked. Reuses of the same on-disk inode st= ructure > are considered new files and must provide different file handles from= the > previous incarnation. Most file systems designed to store user data > naturally provide this capability. Pseudofilesystems that are for lo= cal > reporting and control (e.g. kernfs, pidfs, nsfs) usually can't suppor= t this. >=20 > This flags is a hard requirement for export via nfsd. Any filesystem = that > is eligible to be exported via nfsd must indicate this guarantee by > setting this flag. Thanks Christoph! I'll plan to adopt this for v3. --=20 Jeff Layton