From patchwork Sat Feb 8 01:35:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Rosenberg X-Patchwork-Id: 11371461 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 78472138D for ; Sat, 8 Feb 2020 01:36:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4D70820838 for ; Sat, 8 Feb 2020 01:36:20 +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 S1727661AbgBHBgT (ORCPT ); Fri, 7 Feb 2020 20:36:19 -0500 Received: from mail-pf1-f201.google.com ([209.85.210.201]:43159 "EHLO mail-pf1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727639AbgBHBgQ (ORCPT ); Fri, 7 Feb 2020 20:36:16 -0500 Received: by mail-pf1-f201.google.com with SMTP id x199so813918pfc.10 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=UOcAIMB/OhNz3J8UI8ZbVOtDHjqk3tsjIopFjwOA55RnSAbtKOIFe8eU4sxOmU2Rn3 7MTcrVEZQQTluA6+1h/asUEU9IuAYhIgZ/xM/ZbAcbKjdr3pYH/afOpQSrUnXxKUbGAx IibzYEIaVa0CCmD2WAA6e+LYM40BQyKwxjF66f9MsVQjucofSqffEflnli119COJTdx6 SNUryTTcfT7BYo9dG0kd9NIEsnMhgF8ZcRRbuIB+AVz+SXPU4LTBcww+Gkc0LjfJgzrt BMRlTPT05ik6rJBSjluxPjDWoS0vFTcpsfNwWaNhiasBUERSekRth4vu7bnlmF1QRIO4 30qw== X-Gm-Message-State: APjAAAXtrBQvk6SDCeV6bde0k/GoURDK04ZbfEtRYFvU6XhzfmyxsNMO OmnVz5dpDG/cOvASYrLCHysB4E7/2hw= 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 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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);