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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DAD31C4167B for ; Tue, 7 Nov 2023 16:41:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234666AbjKGQlE (ORCPT ); Tue, 7 Nov 2023 11:41:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234929AbjKGQk5 (ORCPT ); Tue, 7 Nov 2023 11:40:57 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C7EC16A54; Tue, 7 Nov 2023 07:51:29 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F37B5C433BC; Tue, 7 Nov 2023 15:51:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699372289; bh=q3BITIy8opuIjS+oLemqzqpgPqKW0JqkXmNUxSWmM7Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SxGqfy7ZcWKUuUEqQ3nBqZolxWmombWaar1UxQfLYO2YT5iMyv77ZrKtao625SMm5 T+NimugxWddRk1wN6mZqhQQAlBca+SZHQ0nFD/4CwpdSkYJA/lXW1guQUL0zOgenQh nuwOTffDARCz6GyoCgNrQnIYHF9IylRukaSqfWFQ/eZpTNOqfytbJJqFGIgz/rjZAu diqqiin5jGauTbCsMF//iMALgFTYpdkaKqqa/qkV+0ijpV++KjswCN3xGX3o/uJQPZ VbZADBa/v10YESoPkU1mfG/3FKXWtnT7cwi6PTiQbUX5d9F0CjOguyvlueXt6+2030 ONDUmrOpyF5wA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Yuezhang Mo , Andy Wu , Aoyama Wataru , Namjae Jeon , Sasha Levin , sj1557.seo@samsung.com, linux-fsdevel@vger.kernel.org Subject: [PATCH AUTOSEL 6.1 29/30] exfat: support handle zero-size directory Date: Tue, 7 Nov 2023 10:50:03 -0500 Message-ID: <20231107155024.3766950-29-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231107155024.3766950-1-sashal@kernel.org> References: <20231107155024.3766950-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.61 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yuezhang Mo [ Upstream commit dab48b8f2fe7264d51ec9eed0adea0fe3c78830a ] After repairing a corrupted file system with exfatprogs' fsck.exfat, zero-size directories may result. It is also possible to create zero-size directories in other exFAT implementation, such as Paragon ufsd dirver. As described in the specification, the lower directory size limits is 0 bytes. Without this commit, sub-directories and files cannot be created under a zero-size directory, and it cannot be removed. Signed-off-by: Yuezhang Mo Reviewed-by: Andy Wu Reviewed-by: Aoyama Wataru Signed-off-by: Namjae Jeon Signed-off-by: Sasha Levin --- fs/exfat/namei.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c index 90b0477911449..30e97c51f0e14 100644 --- a/fs/exfat/namei.c +++ b/fs/exfat/namei.c @@ -338,14 +338,20 @@ static int exfat_find_empty_entry(struct inode *inode, if (exfat_check_max_dentries(inode)) return -ENOSPC; - /* we trust p_dir->size regardless of FAT type */ - if (exfat_find_last_cluster(sb, p_dir, &last_clu)) - return -EIO; - /* * Allocate new cluster to this directory */ - exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags); + if (ei->start_clu != EXFAT_EOF_CLUSTER) { + /* we trust p_dir->size regardless of FAT type */ + if (exfat_find_last_cluster(sb, p_dir, &last_clu)) + return -EIO; + + exfat_chain_set(&clu, last_clu + 1, 0, p_dir->flags); + } else { + /* This directory is empty */ + exfat_chain_set(&clu, EXFAT_EOF_CLUSTER, 0, + ALLOC_NO_FAT_CHAIN); + } /* allocate a cluster */ ret = exfat_alloc_cluster(inode, 1, &clu, IS_DIRSYNC(inode)); @@ -355,6 +361,11 @@ static int exfat_find_empty_entry(struct inode *inode, if (exfat_zeroed_cluster(inode, clu.dir)) return -EIO; + if (ei->start_clu == EXFAT_EOF_CLUSTER) { + ei->start_clu = clu.dir; + p_dir->dir = clu.dir; + } + /* append to the FAT chain */ if (clu.flags != p_dir->flags) { /* no-fat-chain bit is disabled, @@ -644,7 +655,7 @@ static int exfat_find(struct inode *dir, struct qstr *qname, info->type = exfat_get_entry_type(ep); info->attr = le16_to_cpu(ep->dentry.file.attr); info->size = le64_to_cpu(ep2->dentry.stream.valid_size); - if ((info->type == TYPE_FILE) && (info->size == 0)) { + if (info->size == 0) { info->flags = ALLOC_NO_FAT_CHAIN; info->start_clu = EXFAT_EOF_CLUSTER; } else { @@ -888,6 +899,9 @@ static int exfat_check_dir_empty(struct super_block *sb, dentries_per_clu = sbi->dentries_per_clu; + if (p_dir->dir == EXFAT_EOF_CLUSTER) + return 0; + exfat_chain_dup(&clu, p_dir); while (clu.dir != EXFAT_EOF_CLUSTER) { @@ -1262,7 +1276,8 @@ static int __exfat_rename(struct inode *old_parent_inode, } /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */ - if (new_entry_type == TYPE_DIR) { + if (new_entry_type == TYPE_DIR && + new_ei->start_clu != EXFAT_EOF_CLUSTER) { /* new_ei, new_clu_to_free */ struct exfat_chain new_clu_to_free; -- 2.42.0