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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> Reply-To: NeilBrown MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 0E207180009 X-Stat-Signature: 7x3kceyormsqromsi6yqsgd16zsiq951 X-HE-Tag: 1790653365-303494 X-HE-Meta: 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 OcZyFY6q 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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