From: Eric Biggers <ebiggers@kernel.org>
To: Alex Markuze <amarkuze@redhat.com>
Cc: ceph-devel@vger.kernel.org, idryomov@gmail.com,
xiubo.li@clyso.com, slava@dubeyko.com, viro@zeniv.linux.org.uk,
brauner@kernel.org, jack@suse.cz, linux-fsdevel@vger.kernel.org,
linux-fscrypt@vger.kernel.org, tytso@mit.edu, jaegeuk@kernel.org,
linux-kernel@vger.kernel.org, kernel test robot <lkp@intel.com>
Subject: Re: [PATCH v5 1/5] dcache: export d_find_alias_rcu() for modular filesystems
Date: Wed, 21 Oct 2026 10:24:44 -0700 [thread overview]
Message-ID: <20261021172444.GE1879@quark> (raw)
In-Reply-To: <ad1e9d2c5ba4803f1c7dafc6687638b0489a7265.1792527529.git.amarkuze@redhat.com>
On Tue, Oct 20, 2026 at 08:26:46PM +0000, Alex Markuze wrote:
> The Ceph subvolume quarantine ancestry walk needs to find a dentry
> alias under RCU without taking a reference. d_find_alias_rcu() provides
> these semantics, but it is not exported, so a modular Ceph client fails
> at modpost with an undefined reference to the helper.
>
> Export d_find_alias_rcu() to GPL modules so filesystem modules can use
> the existing RCU lookup without changing its lifetime rules.
>
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202610171220.i77KPiw5-lkp@intel.com/
> Signed-off-by: Alex Markuze <amarkuze@redhat.com>
This is a prerequisite for later commits rather than a bug fix. So it
shouldn't really have Reported-by and Closes tags, even if you found out
it was needed via the kernel test robot.
- Eric
next prev parent reply other threads:[~2026-10-21 17:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-20 20:26 [PATCH v5 0/5] ceph: support subvolume quarantine Alex Markuze
2026-10-20 20:26 ` [PATCH v5 1/5] dcache: export d_find_alias_rcu() for modular filesystems Alex Markuze
2026-10-21 17:24 ` Eric Biggers [this message]
2026-10-20 20:26 ` [PATCH v5 2/5] fscrypt: allow filesystems to disable symlink target caching Alex Markuze
2026-10-20 20:26 ` [PATCH v5 3/5] ceph: add subvolume quarantine wire definitions Alex Markuze
2026-10-20 20:26 ` [PATCH v5 4/5] ceph: record subvolume quarantine from MDS cap updates Alex Markuze
2026-10-20 20:26 ` [PATCH v5 5/5] ceph: fail quarantined subvolume access with EACCES Alex Markuze
2026-10-21 17:22 ` Eric Biggers
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