From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f46.google.com (mail-wm1-f46.google.com [209.85.128.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 43850396562 for ; Mon, 13 Apr 2026 21:06:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.46 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776114387; cv=none; b=HlGu6EcT3VS+tmnfmWcQtODJQRcYHfnLUW8OLmLVuydUbBEbM27xtS9AlS/8q6gwnmfDBAQ5PXvU3+/fbvg1OD3dCIdr+qtm0xpOAKNribO820LSEWCs9JTO9nNV8wSBiN4bHaPytfOf489ppy5GE9wZQs4MFXMyc9NRoYOx0bg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776114387; c=relaxed/simple; bh=+r1Y3kHnY4xi3Jk1Q7GHUslpyQv7/s2wi8tCMEA0jz4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=oeOQ91srxMKv5f7NGVJkxIVpWW1HrGXKwY0hcLH9bVE/RsSVngofIP6aysAOe4tG01H9s5rp56bZTXO4W9XML1wTdygN5OUIqY7D5UOy0Ar7XN5GfToeUILOcb9eNgw58UmPwpJIS9Cx2PU+Clh2XwPGM5bk8U8gKKxM/tWvFlk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=hackers.camp; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.128.46 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=hackers.camp Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-wm1-f46.google.com with SMTP id 5b1f17b1804b1-48880947b7dso6520995e9.0 for ; Mon, 13 Apr 2026 14:06:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776114383; x=1776719183; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=jLhHtjSxaas4v+h5EWtZjmwyeBl0aB7UUhjqllpkU1I=; b=qYzcmnMGrS7CpFUiSsm6j7lRJLa+vBBv7y3zjUTWZyke+4z/HojXjZWmCQknyxD9XG zKhwOV1uh8hCoc7V1lEaYHSdAuuewzn8IBoho0IT7uMr2YFVna6K10y8G6liNG7COxUM RPhGWGavhtcMN0uymEzB3xLBKUgz0USmKpCw2PEN6Ric/HdQB4aslVRbc3x2y2thDKf7 y9S6FRBQQ8SuAk4YAjv+qV6rLWJpm36ANmW0uYelZInCiFHRJgl7t7cVqLCB+54AktaU h+ND0Ek8dX0Pnr+DQ8IxTez2XIVSgnzUR4tfS4kVOYR4Ftaot78NB2BClWAiTAn2Mq3m EMMQ== X-Gm-Message-State: AOJu0YwFWoLwJoOmYayAhiABmu8sqYTRFR4A7QF6hw1KZNMQ7+lSwJK1 QbUOz787cYCeB9InCzyjYaNlLk6XDIw8YC15jRcYsikwXac1gisJSQQL2IoBpEUMfkg= X-Gm-Gg: AeBDiet7sSa3C2ReWIkrEj5TUt7x1OOMF/hHiTlV76qHsjUZvbk6qbmbWCQMUxxMFrl AhrA3HfOa+JDdPbi2eJwDEY2G2LO1ZYjrPaMN0ZpAsHa3D2wsQlKGSHLE7TfJZipl2ICBYyAmBt 5DO81EyS4Ugx5K9e4Bd6qmLW2dr8I5xWX9t6YQvFb0+zPBKpRRUFI6+po/Y8tsR6Xfsm6PilG35 9ONCR1AgoEqlPVybo5PAMy6kGoynSe8kKcLwdzQ0Rkah3oQiVafd0+MrP+HFlYIvXsMAwXvaT0M MKEERJyrU0vsPZkh2V5CgpwpSEL8aXvCjo4x9URFaiPxbhYqnegTAe2fLwQox0+Q/V/NLgyv9ok 2wn/hVAe8Kz9hnWCUhf6UO1kOJVlZWKdLtHfOHieY+7mUB+TwfRwChE/w2Bf6p86jVICM1jBzNq fiYIunNVa3lAT5Xfych9cJ2Kzmtan3iyySBHZHTjZp9m+I0QbR8ppI3nZS4ePL/wIwoyzeIiF+D lnQ X-Received: by 2002:a05:600c:4689:b0:488:93c5:4dc with SMTP id 5b1f17b1804b1-488d7f76192mr120984355e9.7.1776114383341; Mon, 13 Apr 2026 14:06:23 -0700 (PDT) Received: from spartian-1.home ([2a01:cb1c:784:2f00:708:2805:7128:7a75]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43d63e5c98fsm35130020f8f.35.2026.04.13.14.06.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Apr 2026 14:06:22 -0700 (PDT) From: Aurelien DESBRIERES To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Aurelien DESBRIERES , viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, djwong@kernel.org, adilger@dilger.ca, pfalcato@suse.de Subject: [PATCH v2 04/11] ftrfs: add directory operations Date: Tue, 14 Apr 2026 01:05:45 +0200 Message-ID: <20260413230601.525400-5-aurelien@hackers.camp> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260413230601.525400-1-aurelien@hackers.camp> References: <20260413230601.525400-1-aurelien@hackers.camp> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Implement directory iteration and lookup: - ftrfs_readdir(): iterate directory entries from direct blocks, emit via dir_emit_dots() then dir_emit() for real entries, use ctx->pos as entry index with INT_MAX as EOF sentinel - ftrfs_lookup(): search directory blocks for a matching name, call ftrfs_iget() on match and return via d_splice_alias() Both functions scan ftrfs_dir_entry records in direct block pointers only (no indirect block support yet). Signed-off-by: Aurelien DESBRIERES --- fs/ftrfs/dir.c | 132 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 132 insertions(+) create mode 100644 fs/ftrfs/dir.c diff --git a/fs/ftrfs/dir.c b/fs/ftrfs/dir.c new file mode 100644 index 000000000..dbf0102a4 --- /dev/null +++ b/fs/ftrfs/dir.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * FTRFS — Directory operations + * Author: roastercode - Aurelien DESBRIERES + */ + +#include +#include +#include "ftrfs.h" + +/* + * ftrfs_readdir — iterate directory entries + */ +static int ftrfs_readdir(struct file *file, struct dir_context *ctx) +{ + struct inode *inode = file_inode(file); + struct super_block *sb = inode->i_sb; + struct ftrfs_inode_info *fi = FTRFS_I(inode); + struct buffer_head *bh; + struct ftrfs_dir_entry *de; + unsigned long block_idx, block_no; + unsigned int offset; + + /* EOF guard */ + if (ctx->pos == INT_MAX) + return 0; + /* Emit . and .. (ctx->pos: 0=., 1=.., 2+=real entries) */ + if (ctx->pos < 2) { + if (!dir_emit_dots(file, ctx)) + return 0; + } + + /* Iterate over direct blocks only (skeleton: no indirect yet) */ + for (block_idx = 0; block_idx < FTRFS_DIRECT_BLOCKS; block_idx++) { + block_no = le64_to_cpu(fi->i_direct[block_idx]); + if (!block_no) + break; + + bh = sb_bread(sb, block_no); + if (!bh) + continue; + + offset = 0; + while (offset < FTRFS_BLOCK_SIZE) { + de = (struct ftrfs_dir_entry *)(bh->b_data + offset); + + if (!de->d_rec_len) + break; /* end of dir block */ + + if (de->d_ino && de->d_name_len) { + if (!dir_emit(ctx, + de->d_name, + de->d_name_len, + le64_to_cpu(de->d_ino), + de->d_file_type)) { + brelse(bh); + return 0; + } + ctx->pos++; + } + + offset += le16_to_cpu(de->d_rec_len); + } + + brelse(bh); + } + + ctx->pos = INT_MAX; + return 0; +} + +/* + * ftrfs_lookup — find dentry in directory + */ +struct dentry *ftrfs_lookup(struct inode *dir, + struct dentry *dentry, + unsigned int flags) +{ + struct super_block *sb = dir->i_sb; + struct ftrfs_inode_info *fi = FTRFS_I(dir); + struct buffer_head *bh; + struct ftrfs_dir_entry *de; + struct inode *inode = NULL; + unsigned long block_idx, block_no; + unsigned int offset; + + if (dentry->d_name.len > FTRFS_MAX_FILENAME) + return ERR_PTR(-ENAMETOOLONG); + + for (block_idx = 0; block_idx < FTRFS_DIRECT_BLOCKS; block_idx++) { + block_no = le64_to_cpu(fi->i_direct[block_idx]); + if (!block_no) + break; + + bh = sb_bread(sb, block_no); + if (!bh) + continue; + + offset = 0; + while (offset < FTRFS_BLOCK_SIZE) { + de = (struct ftrfs_dir_entry *)(bh->b_data + offset); + + if (!de->d_rec_len) + break; /* end of dir block */ + + if (de->d_ino && + de->d_name_len == dentry->d_name.len && + !memcmp(de->d_name, dentry->d_name.name, + de->d_name_len)) { + unsigned long ino = le64_to_cpu(de->d_ino); + + brelse(bh); + inode = ftrfs_iget(sb, ino); + goto found; + } + + offset += le16_to_cpu(de->d_rec_len); + } + brelse(bh); + } + +found: + return d_splice_alias(inode, dentry); +} + +const struct file_operations ftrfs_dir_operations = { + .llseek = generic_file_llseek, + .read = generic_read_dir, + .iterate_shared = ftrfs_readdir, +}; + + -- 2.52.0