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 643CB3CCFBA for ; Tue, 14 Apr 2026 10:07:35 +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=1776161257; cv=none; b=o3bt9uSiVxUR2/w/opmne+21l1cgys2WHTUMMFE2Pv3YXVyJp6drQEbv1RWOi6ppyB59Yjvlh5JHq3VhsecKFfYsm8XV4rWDblt/6W1rMj9NmjdmwB+XOH+Iitx7m1c8QnYvdlsIR34BMaBfrB1q+C3gCgRyp0Ik888vANVXSH0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776161257; c=relaxed/simple; bh=UpYZeqLlO7XAI8xioHTCGc+EjyJYzK1FRJsK8WUWOeU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=peyOKFXgv1dAXO0VGctRTIAOnv6rGqp1+5aHN2aVUNAvxzZW1wrhhMZPXtRq0s/BvEM2tT23ozlg0H0r21hcXaW+eSj5bJOtG2UUxmX2MJOjhCQcPxHrwFs/ZYp/lo4aWwkldQJmOwF2CegbfF12D4Zisb5AsYKPeLM8T+eZjxw= 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 5b1f17b1804b1-483708b697cso8693165e9.3 for ; Tue, 14 Apr 2026 03:07:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776161253; x=1776766053; 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=GZYlrpG6ibaaLw+Sa4FOLMlMfX1UHEtv7mMrIDu+G+Y=; b=YPHc47heSXagZMXYHWPpK5Ctb3jiFiJPYCJO1RABtos0vwp3F4Tr660SnLLtt5NrDM in4AchuuK9p5/jLxbZZGohwqpq9+Hj0SDIlBzwFcTyJyCXHRVHVRQ+z5ckSVl8EN3MOK zZ5XujIksvxdmphmrx3i1lrYAPBS6iN0xsewj9UInfzXx1RESFjxUMm1nDjkRYSYuV9N 7CWNyckT2wiyQTC4ulLMj3jyX2vVVULARqqOmX8hHDhz9HlxscaCzwBETO1Qeyo9tuia /p879ZG9nT6JppXaWm74+kX5jo6o2zRxjJl8mkzB67MbOMmTEnydJH1zdBQ3oul3l5uv S9gw== X-Gm-Message-State: AOJu0Yw9l29PnpwM8bQsXQKcmLnjh9sZBN8acjjbaVUs9UAaGLZntnc0 Po+uiNPR5lt3ow20eGO4GeQF0p2Dz6M4iQDSv5aLmX+lo1VoGM4UXo9ZFtZgmemw X-Gm-Gg: AeBDieu8VIszlBFiDnKYpZIVLbYIMwuqFQIxCIcbZJeLPC+nwmHPvq868NYeulEZlC2 M2w4iPcEPatoagRU3L7FKs0N7B+Y7mDS+LsOXHz9EZxcwm9DAjkE4T1StzSXQUvhRLy9HFhUvfM T5ADhMevw9ici8kOc/etjDHowk3G9+kyyJr8ajbbx71Fc/CALnOrpdKxh5rpXOT0y73tQPyw/pU ripbNUlbc4KSJqnMeOJ3u5XLJDn0CmNkOMni909r2FyJDubguj3Poj+iqRvbNBrhVpreFU94kXd piqMl2rRTozmII1MKurJgV5jY7IOTnhmhK3nIjgOBf8nqgGuf4bhd3UIO6H8uxKuP+LVeEnRNzS BK3qrrtM3JiHH7grWNiAJcMhODTMsw24hI/ozHrfEVQL68/edc+BOJBR9UgyyZpju4pwDAzoned I19BX6yRW6FdQBYobA5cex2HHlUQ0DYDy3kceNUIwCl5qs7qqPMg3ULlO3wu/A2NIeRV1Be17nA Vk= X-Received: by 2002:a05:600c:b85:b0:486:fb8a:fed with SMTP id 5b1f17b1804b1-488d68a0975mr124812685e9.8.1776161253251; Tue, 14 Apr 2026 03:07:33 -0700 (PDT) Received: from spartian-1.home ([2a01:cb1c:784:2f00:708:2805:7128:7a75]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488ede1e050sm65870545e9.5.2026.04.14.03.07.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Apr 2026 03:07:32 -0700 (PDT) From: Aurelien DESBRIERES To: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, willy@infradead.org, djwong@kernel.org, adilger.kernel@dilger.ca, pedro.falcato@gmail.com, xiang@kernel.org, Aurelien DESBRIERES Subject: [PATCH v3 04/12] ftrfs: add directory operations Date: Tue, 14 Apr 2026 14:07:17 +0200 Message-ID: <20260414120726.5713-5-aurelien@hackers.camp> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260414120726.5713-1-aurelien@hackers.camp> References: <20260413230601.525400-1-aurelien@hackers.camp> <20260414120726.5713-1-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 000000000000..dbf0102a40f3 --- /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