From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793053576; b=m1Qc4RRULxnWVF47NgWaN1M2ibQUiIXjrXGBfRP0HCrGooKlUYBchD8v7aKAfZSKBCbJ fdVkQvPqhL097GCb6gDiqnV6YyZuyPme8eq0abBBZxhKSTXQq5ofx6LhSh6jABZKafN17 pzK8MjvPdjKhPNNLpvI6TswvYagiozvOhQsTk3Ysf0SoOVIkhEsVVd9cu4/4Quxckya0U T0r9mNwbs3v7vkuYJPlQBW1F6lDlul9Jbwu8aALtB93rYTR9laiWzLhMabgVjmq657nGU 4yVW373961tlAOXOmGlkwDh8gqfTsimBAH2uCiF59AvQBuiJfQlO29EvU7qDPZZWUoA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793053576; h=Received:DKIM-Signature:Received:From:To:Cc:Subject:Date:Message-Id: X-Mailer:In-Reply-To:References:MIME-Version:Content-Type: Content-Transfer-Encoding; bh=+AHOeQv+GND5Q0M/3XIRcfQVZxyeXsBzdilGn7fzPqE=; b=aQvAaKQNbzOylSDVD3xOdcmlW4t5eFnhAuX1mwxuOThv/WYxRiNYyEkcSfIHA6FHXAq5 QyvE6u3/p1394kBNU6pwA9udFnRtHaFlp9XXp9swAiU7r3XjBnR6I3nM3pypN4JNOuGGT kBJQmKoQ+bI15QAu3tDlaF2gnEPeMc90n4hN94nsUcpl41QzLsj5KveLwq8qicS6cO0Wk M5Lo0oFrvYJMGeNm0cRttu62NvYPNDk6Pv47SQEeWuqhMF9voRuQlsK4UIMu0PVUc9CCt aUHrkUFPYZ/bx3HgyP0At9hK2LWGvgPdXhd6AumRXw56bmzfpF3XjRdxq4AWWZqGeJg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=fsqUjz6c; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ECE5F606A329; Mon, 26 Oct 2026 22:26:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=fsqUjz6c Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8E6C31F01828; Mon, 26 Oct 2026 22:26:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793053575; bh=+AHOeQv+GND5Q0M/3XIRcfQVZxyeXsBzdilGn7fzPqE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=fsqUjz6c1FUL5rCoTT14tRhqUo9UwOIBO+2bolJH2qKA0Xk0QGQwA7m4PY29CG5Nk DJTHVPeXWtM+kof+vLFHDYyv/rATaPuIj1mxIXDNEbZEtNg9TEw7ESEZL4uNsMaTkV 4SrXPaLGurR21Lhu7Qa5GOTLA1eD72L/J7AIepOAgZLZLBIbAJgsB8HVIxC4zA1jVb GUwgOdjqS3sK9ZLo4be9W3SS5QMZfIXHuJGrhp1zei03mz/MRVMRw4ynJGn3+l6cAG /Ymgtwd04JKUschWJBS48VpIUU2ULX6p0L7DVUzMmbfvj5G/hnq72cXdtqadHmNl4f mj2zcaA9VuMwQ== Received: by pali.im (Postfix) id C4F05FA6; Mon, 26 Oct 2026 23:26:10 +0100 (CET) From: =?UTF-8?q?Pali=20Roh=C3=A1r?= To: Paulo Alcantara , Namjae Jeon Cc: linux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v7.3 7/9] cifs: Create native Window socket file compatible also with WSL subsystem Date: Mon, 26 Oct 2026 23:25:58 +0100 Message-Id: <20261026222600.17323-8-pali@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20261026222600.17323-1-pali@kernel.org> References: <20261026222600.17323-1-pali@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit After creating a native socket via the IO_REPARSE_TAG_AF_UNIX reparse point, try to set also the WSL EA $LXMOD. This makes the native Win32 / NT socket file recognized also under WSL subsystem. WSL subsystem uses same reparse point tag but requires also to be EA $LXMOD set. Fixes: 45a99d5d1173 ("cifs: Add support for creating native Windows sockets") Signed-off-by: Pali Rohár --- fs/smb/client/reparse.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c index 86eb56dbc81a..6a7e6d9ad375 100644 --- a/fs/smb/client/reparse.c +++ b/fs/smb/client/reparse.c @@ -409,7 +409,7 @@ static int detect_directory_symlink_target(struct cifs_sb_info *cifs_sb, static int create_native_socket(const unsigned int xid, struct inode *inode, struct dentry *dentry, struct cifs_tcon *tcon, - const char *full_path) + const char *full_path, umode_t mode) { struct reparse_data_buffer buf = { .ReparseTag = cpu_to_le32(IO_REPARSE_TAG_AF_UNIX), @@ -423,6 +423,10 @@ static int create_native_socket(const unsigned int xid, struct inode *inode, .iov_base = &buf, .iov_len = sizeof(buf), }; +#ifdef CONFIG_CIFS_XATTR + const __le64 xattr_mode_val = cpu_to_le64(mode); + struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); +#endif struct inode *new; int rc = 0; @@ -433,6 +437,28 @@ static int create_native_socket(const unsigned int xid, struct inode *inode, d_instantiate(dentry, new); else rc = PTR_ERR(new); + + /* + * Try to set also optional WSL EA $LXMOD but ignore errors. + * WSL socket and native Win32/NT sockets uses same reparse point + * tag IO_REPARSE_TAG_AF_UNIX. WSL subsystem additionally requires + * EA $LXMOD to be set with the S_IFSOCK value. So setting this EA + * allows native socket to be recognized also by WSL subsystem. + * Note that setting of both EAs and reparse points is not supported + * by NTFS filesystem on Windows 8 / Windows Server 2012 and always + * fails. So ignore failures from this set_EA call. + */ +#ifdef CONFIG_CIFS_XATTR + if (!rc && tcon->ses->server->ops->set_EA && + (le32_to_cpu(tcon->fsAttrInfo.Attributes) & FILE_SUPPORTS_EXTENDED_ATTRIBUTES)) + tcon->ses->server->ops->set_EA(xid, tcon, full_path, + true /* open reparse point */, + SMB2_WSL_XATTR_MODE, + &xattr_mode_val, + SMB2_WSL_XATTR_MODE_SIZE, + cifs_sb->local_nls, cifs_sb); +#endif + cifs_free_open_info(&data); return rc; } @@ -742,7 +768,7 @@ int mknod_reparse(unsigned int xid, struct inode *inode, struct smb3_fs_context *ctx = CIFS_SB(inode->i_sb)->ctx; if (S_ISSOCK(mode) && !ctx->nonativesocket && ctx->reparse_type != CIFS_REPARSE_TYPE_NONE) - return create_native_socket(xid, inode, dentry, tcon, full_path); + return create_native_socket(xid, inode, dentry, tcon, full_path, mode); switch (ctx->reparse_type) { case CIFS_REPARSE_TYPE_NFS: -- 2.20.1