From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f44.google.com (mail-wm1-f44.google.com [209.85.128.44]) (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 9B7F23C65E2 for ; Mon, 13 Apr 2026 12:24:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.44 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776083061; cv=none; b=usnWMBHbs136QJ9yWhlRyiVI0JpwETXge+e6do/KJllFud203QAJiWgAlZVWpRz47Upj8LPTtFXZg6wYOj7DeqO/QjmdfQ0QUJn51mBH7QbBB1nJTXB8iWq4W8TLSlwqx9YIe/P4rih16iQpRb7nNB648YgotdoHbSNgROKK5Tk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776083061; c=relaxed/simple; bh=yt6AQEGexMi31bn9lGbYxFgju7CUboUcmrk812jtz6w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=rK+/JShtAon1etO6Tg6ZU0iRkvRp5cSxxjZoEiq7kLPm/1kqUbBuBc6Rnh5h+EOOGSKu0MB0t1zxh6XUiTAY8cOPBEGbNT3SKuXtRLA+r9bNwS6kNPFslVYeSPMuPBSY/S/drwjx1tfspMlg4qIUnSUqfAjF15SEEsKQjbxfAmg= 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=209.85.128.44 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-f44.google.com with SMTP id 5b1f17b1804b1-4836d9d54f6so5428325e9.1 for ; Mon, 13 Apr 2026 05:24:19 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776083058; x=1776687858; 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=A5Jn05Q3TPNOW6ydFxJw6VAfsd3poytYHJlGPnxkM3g=; b=VLRf3ZLqLcWc8mnhJeb8M6BVablCrbETusYC9kXc9F9+vbW5+k3d8O6St79PEmCZZw +akgYRSMBTzuld6wiRlRGaXakAhie3jEUZ6KtRTgSmfxYoSG3lgvvDHkFMddfNobPySQ Ji6EoxOE6ffBnDSM9VizjEElurNdjEqz71nbslRZu8kQF8E1LXatuKkxqm8nQQghzSi6 uBdesPqAHwISyQdzMGvU4sx+AOhcomfx+eWy/TdZ/1X6u3DNWZv4ixZre8+a6JJztCSF P3E43wONWUhyITi3JvOZsN7a6lUe+uA7bDq1OYq8DB4o3R/C6zwdpj0iXZDjUB6grIpO XYcQ== X-Gm-Message-State: AOJu0Yz3AqqIl8iKFNdbIowvyxV7GsV7HfFRxZFzWn0qwjAQ2hGSc6PO tM0IzGFUwkdHiCIm7g1wRzCH2gUXgjVnhW5BsbPMG260bEYzyj+jYUHkcVE2AVXk0Kc= X-Gm-Gg: AeBDiesn2H2FDKB7Ir8IfqqQ85ex3bqx0FksPz1hedxyfVPZ0vkn0URiLJKb28fN+P/ yc10urNqu43DoR45z4tvmgp/Dwhzxi+s3zStYQg9Y50LMfHSyeCus8ZjHqEMzwR+K22ZFhckiho dRaBfmy3fF8a2fNDG7Lm3iYs27BpPGISEapf/5ZNznDshJ3Ryv4eDGAZzkVXMzUO5FOx/E8NIAu QVApBdeqtb32yDSUD1CD58LU0ctTHoDqISE8/vXb3yCRjms4/VWVasHv77qfZkjCyGIXDeLHtAk W5DToavFz0r/W5xwsvXmzLRoin5cx0JTY/PSDPAcj/k4TpjkrOdcaqLkh7qu0iSd/RHFVeU+uXH DIf41ZgmtPj+bj9cRnuIWg8uc6erRRHc7yregbwWq/swNrAwyy8MGYqfWCHpSWc/rnSscG3u/z1 a4ZxwZrbPn31RZiST6yPhya3cRX7mXWKiv4u9aMOdbew72GrxmPfBAEGdXZ6HVuljZKg== X-Received: by 2002:a05:600c:1395:b0:485:329b:24e with SMTP id 5b1f17b1804b1-488d68603bemr95525415e9.5.1776083057460; Mon, 13 Apr 2026 05:24:17 -0700 (PDT) Received: from spartian-1.home ([2a01:cb1c:784:2f00:708:2805:7128:7a75]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488d532ed4dsm278260915e9.4.2026.04.13.05.24.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Apr 2026 05:24:17 -0700 (PDT) From: Aurelien DESBRIERES To: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk, brauner@kernel.org, aurelien@hackers.camp Subject: [RFC PATCH 04/10] ftrfs: add directory operations Date: Mon, 13 Apr 2026 16:23:50 +0200 Message-ID: <20260413142357.515792-5-aurelien@hackers.camp> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260413142357.515792-1-aurelien@hackers.camp> References: <20260413142357.515792-1-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 From: Aurélien DESBRIERES 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: Aurélien 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