From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f41.google.com (mail-wm1-f41.google.com [209.85.128.41]) (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 491A83C5DC9 for ; Mon, 13 Apr 2026 12:24:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.41 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776083060; cv=none; b=eZ0ZcTko8ji/yigX0sA+v23a1eFryLt+hxngKGJjQ5jJdeN3SukAnBKy8YFqg2xFmekLt00kFPv70YXkJceYcYYMFOoXAW6ihJhE4drPD8ML+d1dFab9yh6xApzLKIEehhECZDVO6Qx85YVZZi9O/FZTsl+BZE+9X94Ls2SmIR4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776083060; c=relaxed/simple; bh=yt6AQEGexMi31bn9lGbYxFgju7CUboUcmrk812jtz6w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=EZSqXMUFEMbBHdGzxVFQbaeKaw56FaRfEwjUmjjjnFTWHgz2a4g7I/ItOQmRGL7QcT39++TwsupM72asbm+5RjQGgByzrGEFElxaJGIlafjsN7RFxsAikgnF9iZWndDaitpsSnlvq4cyJKHh2usCK3K9dQ10dnpapWshe2XxAvM= 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=209.85.128.41 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-f41.google.com with SMTP id 5b1f17b1804b1-488a8f97f6bso8168085e9.2 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=XWLU+/kedpNU6FbZN/L2+Ubkt64bKCRnrSxueofyqJT2wrH7d+ooGgk7I+dvlvjFWK e8OXX34DHnN3KmpkmHOEDz2jSpUKeAPOCC+7wsos593qOSFG9oqqAblf3s+S8XTafGFa 6fG1o51BJKIEECg8vqFNawIxlj1KfzjxckCrTqEeqAY9ykYgdz6k5N/6xXYFuNdVpj6F 0dRcgOjZ1C/yyhNtLZO7A1s9WHL66LWZJ+sJRJxkTGNf4QfK4eSTE9/c3s9Z0RqS2pc8 KHvC0QgAcNoxUSHJXN27k9zsBFkl4yLduYGMSkGfYhSeEaYn011b8p7Z2pvCYP4amt/w wV0w== X-Gm-Message-State: AOJu0YxTKbVpw0rkth4uMrwBAQiYF3nEYVkom6uW7ZDx2G2rc4jyBcJl v3b49/fSSZa1SvD+UJyz2aTygLl7mv62OPInEiNPRPsd6aXLuYZPN7E9KVT4uc+TQsA= X-Gm-Gg: AeBDiet7vJrzxuyHwGmbtDd24SYwh9zGHi9RKEpb/65vWqmAgWZVJY4gkrHuvi6Fu3M /q+oO/cZC2Qsd813gLYVix9V0StrEYLcH3mfVdq5fmrrTZAEkYmDGOwxGGAs793raXbiuLBs3P5 HwOx6TYPrl01is8TOEbg8hjWeETp7Sb15C86U7kz+l+qrT2shoXHItPvArpnCy5MP8q4Ga9KRO0 OTWY1zvOHoqJ3wec4JR8a6qNk/TkOcFBVP+TuORwMqtia64Fifwv9oTAFgH59mtdj+Uzj2EAfnZ NwWPwxU/+0QSzm++B2p4uzmjAKOCJYc/nknr7Bw+IxheCx9goF0XFFrQBGbHcI537nJoOcLOVfR Gv3/UUtshbzYH3rzi4R5KPofgGFZvYD+veSRHslnBVe9oqVDX4yBILOmdbx90Img6QUO/Lj0Zum TpQdK74xlpYzHuwSiN6cvqlRa34Um/gmGVIfjCVq5xzL20vTn+BAZOhe6xpzb0ZWwz5g== 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-kernel@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