From nobody Fri Dec 19 17:49:38 2025 Received: from out-179.mta0.migadu.com (out-179.mta0.migadu.com [91.218.175.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 99449261B8C for ; Fri, 5 Dec 2025 04:31:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.179 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764909078; cv=none; b=l9pZUP5L5OEZ5KgWfea+ckIeJQusr88GxKXazB2etkOVisd+EMgcl/zOodRRJMbT9YsezaSVinWaXhiCOiFf8PkxVl7iwzRnIJgtIheKliG3qyk6uo/WMor/lrqsJ2CAPXsbW9f/TIbDBG8f1606NqY37LwHJqknUdsTPNFmqkw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764909078; c=relaxed/simple; bh=GpiP28Us9v7/dQoXwcAvnftubvrrsWxq7Q4tJTESinM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=k9ExKqCCdBy/m0ned9RNFiulc75vxYF8ksusTxzoRJm4kKB67bjum7zQ89Ix90faupEETk14QDZd75+kvB8vyiDbgxv7n5hmleqNANPEOy180bcdnZqD+fLijlwMA3adejr89o/vPBc0Ro2RJ3YnrDw7WqWnloLfjlbM2JHMdTY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=OtMUz/MG; arc=none smtp.client-ip=91.218.175.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="OtMUz/MG" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1764909073; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CCS9W0lF6HDGhdijp7vL3LJGT24noIkWUUQS/1Ee9+o=; b=OtMUz/MGyYlQnkPUOkGBkRzM6htb0FtQo8yS1cgiMzaS6PlNei8lR3PZRL5i1kRsEAmciM NiuBWvUNioZj4z3LoizYW2t8Xp94iVL55Aos3DeXXO3up+JZYZYdhPOfvzdviMisWEODDL /HqXeQCzRvGfpCd1iiSrpZPbYNvpPbI= From: chenxiaosong.chenxiaosong@linux.dev To: sfrench@samba.org, smfrench@gmail.com, linkinjeon@kernel.org, linkinjeon@samba.org Cc: linux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org, chenxiaosong@chenxiaosong.com, ChenXiaoSong Subject: [PATCH v2 6/9] smb/client: use bsearch() to find target status code Date: Fri, 5 Dec 2025 12:29:54 +0800 Message-ID: <20251205042958.2658496-7-chenxiaosong.chenxiaosong@linux.dev> In-Reply-To: <20251205042958.2658496-1-chenxiaosong.chenxiaosong@linux.dev> References: <20251205042958.2658496-1-chenxiaosong.chenxiaosong@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" From: ChenXiaoSong The smb2_error_map_table array currently has 1742 elements. When searching for the last element, the original loop-based search method requires 1742 comparisons, while binary search algorithm requires only 10 comparisons. Signed-off-by: ChenXiaoSong --- fs/smb/client/smb2maperror.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/fs/smb/client/smb2maperror.c b/fs/smb/client/smb2maperror.c index 1bd4196386dd..df8db12ff7a9 100644 --- a/fs/smb/client/smb2maperror.c +++ b/fs/smb/client/smb2maperror.c @@ -2437,9 +2437,9 @@ int map_smb2_to_linux_error(char *buf, bool log_err) { struct smb2_hdr *shdr =3D (struct smb2_hdr *)buf; - unsigned int i; int rc =3D -EIO; __le32 smb2err =3D shdr->Status; + struct status_to_posix_error *err_map, key; =20 if (smb2err =3D=3D 0) { trace_smb3_cmd_done(le32_to_cpu(shdr->Id.SyncId.TreeId), @@ -2453,17 +2453,21 @@ map_smb2_to_linux_error(char *buf, bool log_err) (smb2err !=3D STATUS_END_OF_FILE)) || (cifsFYI & CIFS_RC); =20 - for (i =3D 0; i < sizeof(smb2_error_map_table) / - sizeof(struct status_to_posix_error); i++) { - if (smb2_error_map_table[i].smb2_status =3D=3D smb2err) { - if (log_err) - pr_notice("Status code returned 0x%08x %s\n", smb2err, - smb2_error_map_table[i].status_string); - rc =3D smb2_error_map_table[i].posix_error; - break; - } - } + key =3D (struct status_to_posix_error) { + .smb2_status =3D smb2err, + }; + err_map =3D bsearch(&key, smb2_error_map_table, err_map_num, + sizeof(struct status_to_posix_error), + cmp_smb2_status); + if (!err_map) + goto out; + + rc =3D err_map->posix_error; + if (log_err) + pr_notice("Status code returned 0x%08x %s\n", smb2err, + err_map->status_string); =20 +out: /* on error mapping not found - return EIO */ =20 cifs_dbg(FYI, "Mapping SMB2 status code 0x%08x to POSIX err %d\n", --=20 2.43.0