From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f51.google.com (mail-wm1-f51.google.com [209.85.128.51]) (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 1D008395240 for ; Mon, 13 Apr 2026 21:06:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.51 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776114386; cv=none; b=h32gJ97sAcQc00m0wjnzg+h4p3DWGHZpQJkNGjxLLiDOG68gO2FK5a4XUVgSZ4UO/9GlGF9REx3oA/C3hqP7215HgxHxT3U426ybCJJDpjChuT64TMW/7e5OijYy+QxcyYotTZbCcdDiv4V/VuXdIjXtELOi+CaD42LrCnJTQQ8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776114386; c=relaxed/simple; bh=+r1Y3kHnY4xi3Jk1Q7GHUslpyQv7/s2wi8tCMEA0jz4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=BLqzuPPUgXJDs3NBgwjc4oYyETp7UTOLzPt+ALqxCfsuVIoumxACHoAGxOcWAryExE6pJL53boWH2y8bFTc5ffX3Qk6DqPH2y/P3K6p4fpNiMyhT189OdG33cjuwFmo2EqrUAKktpii1t9jyb9nT0Ih0tWe7G44hJxQH0VWNmC8= 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=209.85.128.51 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-f51.google.com with SMTP id 5b1f17b1804b1-488965a9ca1so5872815e9.2 for ; Mon, 13 Apr 2026 14:06:24 -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=Kjek65YSwHgcVkQw/jIVNUIPEIiL7fubZVz/euFZp+n+vPhw1s4OJyXyDkd33k1r4z Xtr6fAy2FNcud7/KCuvj8tEWtcQsVT7G3Q7nKpiYDz6G0BSsyfNHzMkCrZODBefqIUyk VcUN/Q/rhq2F0vdfqwxNoHaY/Zr1JHx9u96WPHQ0BP60WwTzgoT35BAlhONPyiGkU0VD jdratsPQq7tNdvBPYv3l3bfNgmRwpynKh8kduLLvsXSXlCrsasca5Mkpj/lF2OTB5xpg 4UmUb6dxrKnCJ6FrJg2ZZJ3VU/JQHPQK6mX/I1IAA46m+ILcgFQ53jlnllWs60cuM1l+ +JYA== X-Forwarded-Encrypted: i=1; AFNElJ+CkiHhW1rbe6tOfJL5vaTTP0jicoo6YHSCCMTVs0tPGchIN4WzOrr1X+F053npFzbH3vSO0tcOnN/rIms=@vger.kernel.org X-Gm-Message-State: AOJu0YwgG8BltLqdp3ub0uVwyCmCZcG8euKwi76AhkS84n9Jad24LvGv 7G8p9c6e+qRODE5FePbUoZPOpmWplSC0InTt02P5FG1UYnMxUEt06dvS X-Gm-Gg: AeBDietrW6XNNzdADi+DnUCQTmcDUS5vK8UHCNgaIscTWuw0u2wfY05ERGDwmGT2Reg 8NC6ssf+xC/ltlUjmPkoodmqZUBs5iBkYv8u5gZDdoL/eKe3ecT/RXAFH/ptf5GyQqw/XJYLb+/ 8fRZtdeAVpdb10tmmPTbAzamexaCve7VIU/VjrD4NzsQpCDloDnmff/j6W+s4g9TfQBX7nbf2G6 l7YfGXUXBi7629dtQXGOv8OOGer7R20/9DtCa7kAxjm6fnur4HuD8yma4GCWRftKjy/v+R/XbkI bXX7QMeHNuq4zaFYtsTKV9Z/tKwcLgMbiAskN6UsLTedgbZzGbPeSMuLny2ga26lCnPy5xEs0fe H43+zkmzuj7hI/xDYSwpau/SMUehB9fzLsEKjiQwEK911MRVXJWGnjXdpDNL/9HHdXhG5oR4tlp 0j4BRScyTp1yhXbYmhEaaeFBUZkEnb2iAlwYh6Yr03nLgqvksaLc7JLIN4oPCMoQdYrKCfEFfb6 nVE 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-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 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