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Mon, 28 Sep 2026 23:42:36 -0400 (EDT) From: NeilBrown To: Miklos Szeredi , Amir Goldstein , Kees Cook , Joel Granados , Richard Weinberger , Anton Ivanov , Johannes Berg , Breno Leitao , Andreas Hindborg , Jan Harkes , Hugh Dickins , Baolin Wang , Namjae Jeon , Hyunchul Lee , Carlos Maiolino , Alexander Viro , Christian Brauner Cc: Jeff Layton , Jan Kara , linux-fsdevel@vger.kernel.org, fuse-devel@lists.linux.dev, linux-kernel@vger.kernel.org, linux-unionfs@vger.kernel.org, linux-um@lists.infradead.org, codalist@coda.cs.cmu.edu, coda@cs.cmu.edu, linux-mm@kvack.org, ntfs@lists.linux.dev, linux-xfs@vger.kernel.org Subject: [PATCH 2/7] shmem: use d_duplicate() Date: Tue, 29 Sep 2026 13:36:02 +1000 Message-ID: <20260929034158.1455429-3-neilb@ownmail.net> X-Mailer: git-send-email 2.50.0.107.gf914562f5916.dirty In-Reply-To: <20260929034158.1455429-1-neilb@ownmail.net> References: <20260929034158.1455429-1-neilb@ownmail.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260928_204246_448731_967EA2DF X-CRM114-Status: UNSURE ( 8.10 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: NeilBrown Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org From: NeilBrown To prepare for d_alloc_parallel() being permitted without a directory lock, use d_duplicate() when duplicating a dentry in order to create a whiteout. Signed-off-by: NeilBrown --- mm/shmem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/shmem.c b/mm/shmem.c index 897fa2b61346..8fbab956466c 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -3976,11 +3976,12 @@ static int shmem_whiteout(struct mnt_idmap *idmap, struct dentry *whiteout; int error; - whiteout = d_alloc(old_dentry->d_parent, &old_dentry->d_name); + whiteout = d_duplicate(old_dentry); if (!whiteout) return -ENOMEM; error = shmem_mknod(idmap, old_dir, whiteout, S_IFCHR | WHITEOUT_MODE, WHITEOUT_DEV); + d_lookup_done(whiteout); dput(whiteout); return error; } -- 2.50.0.107.gf914562f5916.dirty