From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 07F8DC2BA83 for ; Sat, 8 Feb 2020 01:36:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C6AF420661 for ; Sat, 8 Feb 2020 01:36:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="MrdeH4pO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727682AbgBHBgV (ORCPT ); Fri, 7 Feb 2020 20:36:21 -0500 Received: from mail-pj1-f73.google.com ([209.85.216.73]:58519 "EHLO mail-pj1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727621AbgBHBgS (ORCPT ); Fri, 7 Feb 2020 20:36:18 -0500 Received: by mail-pj1-f73.google.com with SMTP id ie20so2271477pjb.8 for ; Fri, 07 Feb 2020 17:36:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=jezUd818PVSIqYNtA0ccbF6QkEzuHEy5btO6fArvPPs=; b=MrdeH4pOG0VhjokrPO+C8+7Nf4YOufJfkN9hYYa2/oz3ncPTo4B2SAZ8SdkjjAqgI1 gcExPRszzjqxMxAI7pSi2N38MMxvBlIzg5R/elCsep46b5vsrYA45ae/KmPa+q4Ouk91 c/okvWEhds0a0XG3T3/I+z0lw4v2NpT9X+AdWMEJ6lbWF9L3qSuv6oaZ67EXyrvSWucb sWDhoPGRdiNt6Q+XJvutoqEzlECTf6P0ehHD0Ak4VyqjCl/0YUaAFWSA021IZBlEBUUg r82CuKDO4kctqrNqVbqOFTYdVY+CddgLIrKbJ1vraccZdPyeOoPdSm9/nMpCQv88T4FL 8mpw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=jezUd818PVSIqYNtA0ccbF6QkEzuHEy5btO6fArvPPs=; b=LEQ1FoCpu3nkxYVMImnuHsHg8S9WyjBmtKLdaTksZhzN1unenPsN2QihoZa6UBAyUg BSzZ1v9ToiR6KJQyNKwAxSCijtTwtUTDpv3e07ypsC7Nlh3nsRCj2piYFprHfSAI6JfW QUNb2g4oMqJypBH7XmwLFYB9LnJv/sPhD4g5tujeFW41jwmSzTMELdPG/G0YASOXUAFx tDww/vFKP/KWILAVO671BqQW+VOSDMe8EfOqRC08bTcrgxvpehUiMoioOTBLpRyUsYDh tBL4KvfC/UECre0pfbFnPR8ztV6N0hDMou9rO3oXwC6luClN7NIC/iMyc4Tg2hxQaCAU ++Dg== X-Gm-Message-State: APjAAAUnUvd3sok4H6DyCpzbXt51jGvig3bstfYuY+Zcqd+EiYjX90gK ZubFiyl6EL4Xm47FSc18CjaHFdhcGX0= X-Google-Smtp-Source: APXvYqx9coZlALyzfO6iVzfy3zszXhSMPRNvtVEhoXY1QpczQRWlKN91DMplS8LE25PZWL4IYB6a7K8Z1Tc= X-Received: by 2002:a63:551a:: with SMTP id j26mr2073418pgb.370.1581125776137; Fri, 07 Feb 2020 17:36:16 -0800 (PST) Date: Fri, 7 Feb 2020 17:35:52 -0800 In-Reply-To: <20200208013552.241832-1-drosen@google.com> Message-Id: <20200208013552.241832-9-drosen@google.com> Mime-Version: 1.0 References: <20200208013552.241832-1-drosen@google.com> X-Mailer: git-send-email 2.25.0.341.g760bfbb309-goog Subject: [PATCH v7 8/8] ext4: Optimize match for casefolded encrypted dirs From: Daniel Rosenberg To: "Theodore Ts'o" , linux-ext4@vger.kernel.org, Jaegeuk Kim , Chao Yu , linux-f2fs-devel@lists.sourceforge.net, Eric Biggers , linux-fscrypt@vger.kernel.org, Alexander Viro , Richard Weinberger Cc: linux-mtd@lists.infradead.org, Andreas Dilger , Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Gabriel Krisman Bertazi , kernel-team@android.com, Daniel Rosenberg Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Matching names with casefolded encrypting directories requires decrypting entries to confirm case since we are case preserving. We can avoid needing to decrypt if our hash values don't match. Signed-off-by: Daniel Rosenberg --- fs/ext4/ext4.h | 17 ++++++++------- fs/ext4/namei.c | 55 ++++++++++++++++++++++++++----------------------- 2 files changed, 38 insertions(+), 34 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 9ee9cdd686ce0..40cf3171ef005 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2447,9 +2447,9 @@ extern unsigned ext4_free_clusters_after_init(struct super_block *sb, ext4_fsblk_t ext4_inode_to_goal_block(struct inode *); #ifdef CONFIG_UNICODE -extern void ext4_fname_setup_ci_filename(struct inode *dir, +extern int ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname, - struct fscrypt_str *fname); + struct ext4_filename *fname); #endif #ifdef CONFIG_FS_ENCRYPTION @@ -2480,9 +2480,9 @@ static inline int ext4_fname_setup_filename(struct inode *dir, ext4_fname_from_fscrypt_name(fname, &name); #ifdef CONFIG_UNICODE - ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); + err = ext4_fname_setup_ci_filename(dir, iname, fname); #endif - return 0; + return err; } static inline int ext4_fname_prepare_lookup(struct inode *dir, @@ -2499,9 +2499,9 @@ static inline int ext4_fname_prepare_lookup(struct inode *dir, ext4_fname_from_fscrypt_name(fname, &name); #ifdef CONFIG_UNICODE - ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name); + err = ext4_fname_setup_ci_filename(dir, &dentry->d_name, fname); #endif - return 0; + return err; } static inline void ext4_fname_free_filename(struct ext4_filename *fname) @@ -2526,15 +2526,16 @@ static inline int ext4_fname_setup_filename(struct inode *dir, int lookup, struct ext4_filename *fname) { + int err = 0; fname->usr_fname = iname; fname->disk_name.name = (unsigned char *) iname->name; fname->disk_name.len = iname->len; #ifdef CONFIG_UNICODE - ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name); + err = ext4_fname_setup_ci_filename(dir, iname, fname); #endif - return 0; + return err; } static inline int ext4_fname_prepare_lookup(struct inode *dir, diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index ae53c6f759740..ac848b22f0ad3 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -791,7 +791,9 @@ dx_probe(struct ext4_filename *fname, struct inode *dir, if (hinfo->hash_version <= DX_HASH_TEA) hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed; - if (fname && fname_name(fname)) + /* hash is already computed for encrypted casefolded directory */ + if (fname && fname_name(fname) && + !(IS_ENCRYPTED(dir) && IS_CASEFOLDED(dir))) ext4fs_dirhash(dir, fname_name(fname), fname_len(fname), hinfo); hash = hinfo->hash; @@ -1356,19 +1358,21 @@ int ext4_ci_compare(const struct inode *parent, const struct qstr *name, return ret; } -void ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname, - struct fscrypt_str *cf_name) +int ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname, + struct ext4_filename *name) { + struct fscrypt_str *cf_name = &name->cf_name; + struct dx_hash_info *hinfo = &name->hinfo; int len; if (!needs_casefold(dir)) { cf_name->name = NULL; - return; + return 0; } cf_name->name = kmalloc(EXT4_NAME_LEN, GFP_NOFS); if (!cf_name->name) - return; + return -ENOMEM; len = utf8_casefold(dir->i_sb->s_encoding, iname, cf_name->name, @@ -1376,10 +1380,18 @@ void ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname, if (len <= 0) { kfree(cf_name->name); cf_name->name = NULL; - return; } cf_name->len = (unsigned) len; + if (!IS_ENCRYPTED(dir)) + return 0; + hinfo->hash_version = DX_HASH_SIPHASH; + hinfo->seed = NULL; + if (cf_name->name) + ext4fs_dirhash(dir, cf_name->name, cf_name->len, hinfo); + else + ext4fs_dirhash(dir, iname->name, iname->len, hinfo); + return 0; } #endif @@ -1409,16 +1421,12 @@ static bool ext4_match(struct inode *parent, struct qstr cf = {.name = fname->cf_name.name, .len = fname->cf_name.len}; if (IS_ENCRYPTED(parent)) { - struct dx_hash_info hinfo; - - hinfo.hash_version = DX_HASH_SIPHASH; - hinfo.seed = NULL; - ext4fs_dirhash(parent, fname->cf_name.name, - fname_len(fname), &hinfo); - if (hinfo.hash != EXT4_DIRENT_HASH(de) || - hinfo.minor_hash != - EXT4_DIRENT_MINOR_HASH(de)) + if (fname->hinfo.hash != EXT4_DIRENT_HASH(de) || + fname->hinfo.minor_hash != + EXT4_DIRENT_MINOR_HASH(de)) { + return 0; + } } return !ext4_ci_compare(parent, &cf, de->name, de->name_len, true); @@ -2043,15 +2051,11 @@ void ext4_insert_dentry(struct inode *dir, de->name_len = fname_len(fname); memcpy(de->name, fname_name(fname), fname_len(fname)); if (ext4_hash_in_dirent(dir)) { - struct dx_hash_info hinfo; + struct dx_hash_info *hinfo = &fname->hinfo; - hinfo.hash_version = DX_HASH_SIPHASH; - hinfo.seed = NULL; - ext4fs_dirhash(dir, fname_usr_name(fname), - fname_len(fname), &hinfo); - EXT4_EXTENDED_DIRENT(de)->hash = cpu_to_le32(hinfo.hash); + EXT4_EXTENDED_DIRENT(de)->hash = cpu_to_le32(hinfo->hash); EXT4_EXTENDED_DIRENT(de)->minor_hash = - cpu_to_le32(hinfo.minor_hash); + cpu_to_le32(hinfo->minor_hash); } } @@ -2202,10 +2206,9 @@ static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname, if (fname->hinfo.hash_version <= DX_HASH_TEA) fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned; fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed; - if (ext4_hash_in_dirent(dir)) - ext4fs_dirhash(dir, fname_usr_name(fname), - fname_len(fname), &fname->hinfo); - else + + /* casefolded encrypted hashes are computed on fname setup */ + if (!ext4_hash_in_dirent(dir)) ext4fs_dirhash(dir, fname_name(fname), fname_len(fname), &fname->hinfo); -- 2.25.0.341.g760bfbb309-goog