From nobody Sat Oct 4 21:00:56 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D39D32EA167 for ; Tue, 12 Aug 2025 23:58:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755043099; cv=none; b=BufdLj1d6d+Mf6E54qDyWdiEH9BfRttLTdEL5b+tz6TFWQtROSVbpTuIrrDLK8DkExfJ/gzzN9CcmAcHwU84YiKSbTLy2jsOVmXMsgk4IzuFeMoUw/2DEq5/4Ifx+29tUMIYAVMuJtoisj/zYt+DQrfytvy7u4V0TbAAeT6Dudc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755043099; c=relaxed/simple; bh=ReDrEs2QM9oVpwT4Ru+LnnZtyb0Z4Ptf81izg5DGuRY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=gRjOLgU7QT5rsbfonRG1tXtqhTdkvIVRpye+lv54pfZUH/3F/MwIbC9eJ4bM9EJoff5pobPukaggKyNddnM8Su2j2+epjFf7ILI3UPEKSEguQgB9jLPLgCbRoXLF5CnBpXM35FvX6VGARcgLwJ9v5PeJkwwSVYdJuSY2VCA2R9I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pV92m+vB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pV92m+vB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 667E6C4CEF0; Tue, 12 Aug 2025 23:58:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755043099; bh=ReDrEs2QM9oVpwT4Ru+LnnZtyb0Z4Ptf81izg5DGuRY=; h=From:To:Cc:Subject:Date:From; b=pV92m+vBu4kzIOVpP84WGa0oclITdbAC+ipi4TGoQUOmbDmabbdhwnZSmvJ7CO3Zw xeSf17QC/poNSvKv1MZmKFhZ6K8wIOBRXeeklSxt0dukgETcCZnE8PSZoyEEw8rXa2 5E9EYvpvten4nYWEJYk9b+sfm+F/soID+DA9A6iOxMZ9/8iaRClckAk21WH8BIV2TE wnznxjJnqC6h0jA6q3cF6BJfmK++jbtBDf7i/jN7kOyweM5eDXghkBtsvv8U6Gu28U rIHHDWha1nEfCd0SAu1ONV06cK9wBsJUSrh/Qg/3CDb/lUyM2LCAbZWw7+rksgp/fi ebf4iMA57qzdA== From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Cc: Jaegeuk Kim Subject: [PATCH] f2fs: show the list of donation files Date: Tue, 12 Aug 2025 23:58:14 +0000 Message-ID: <20250812235814.960924-1-jaegeuk@kernel.org> X-Mailer: git-send-email 2.51.0.rc1.163.g2494970778-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This patch introduces a proc entry to show the currently enrolled donation files. - "File path" indicates a file. - "Status" a. "Donated" means the file is registed in the donation list by fadvise(offset, length, POSIX_FADV_NOREUSE) b. "Evicted" means the donated pages were reclaimed. - "Offset (kb)" and "Length (kb) show the registered donation range. - "Cached pages (kb)" shows the amount of cached pages in the inode page ca= che. For example, Donation List # of files : 2 File path Status Offset (= kb) Length (kb) Cached pages (kb) Reviewed-by: Chao Yu --- /local/tmp/test2 Donated = 0 1048576 2097152 /local/tmp/test Evicted = 0 1048576 1048576 Signed-off-by: Jaegeuk Kim --- fs/f2fs/sysfs.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index 1ffaf9e74ce9..2de7557bfebf 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -1769,6 +1769,68 @@ static int __maybe_unused disk_map_seq_show(struct s= eq_file *seq, return 0; } =20 +static int __maybe_unused donation_list_seq_show(struct seq_file *seq, + void *offset) +{ + struct super_block *sb =3D seq->private; + struct f2fs_sb_info *sbi =3D F2FS_SB(sb); + struct inode *inode; + struct f2fs_inode_info *fi; + struct dentry *dentry; + char *buf, *path; + int i; + + buf =3D f2fs_getname(sbi); + if (!buf) + return 0; + + seq_printf(seq, "Donation List\n"); + seq_printf(seq, " # of files : %u\n", sbi->donate_files); + seq_printf(seq, " %-50s %10s %15s %15s %20s\n", + "File path", "Status", "Offset (kb)", + "Length (kb)", "Cached pages (kb)"); + seq_printf(seq, "---\n"); + + for (i =3D 0; i < sbi->donate_files; i++) { + spin_lock(&sbi->inode_lock[DONATE_INODE]); + if (list_empty(&sbi->inode_list[DONATE_INODE])) { + spin_unlock(&sbi->inode_lock[DONATE_INODE]); + break; + } + fi =3D list_first_entry(&sbi->inode_list[DONATE_INODE], + struct f2fs_inode_info, gdonate_list); + list_move_tail(&fi->gdonate_list, &sbi->inode_list[DONATE_INODE]); + inode =3D igrab(&fi->vfs_inode); + spin_unlock(&sbi->inode_lock[DONATE_INODE]); + + if (!inode) + continue; + + inode_lock(inode); + + dentry =3D d_find_alias(inode); + if (!dentry) { + path =3D NULL; + } else { + path =3D dentry_path_raw(dentry, buf, PATH_MAX); + if (IS_ERR(path)) + goto next; + } + seq_printf(seq, " %-50s %10s %15lu %15lu %20lu\n", + path ? path : "", + is_inode_flag_set(inode, FI_DONATE_FINISHED) ? + "Evicted" : "Donated", + fi->donate_start << (PAGE_SHIFT - 10), + (fi->donate_end + 1) << (PAGE_SHIFT - 10), + inode->i_mapping->nrpages << (PAGE_SHIFT - 10)); +next: + inode_unlock(inode); + iput(inode); + } + f2fs_putname(buf); + return 0; +} + #ifdef CONFIG_F2FS_FAULT_INJECTION static int __maybe_unused inject_stats_seq_show(struct seq_file *seq, void *offset) @@ -1878,6 +1940,8 @@ int f2fs_register_sysfs(struct f2fs_sb_info *sbi) discard_plist_seq_show, sb); proc_create_single_data("disk_map", 0444, sbi->s_proc, disk_map_seq_show, sb); + proc_create_single_data("donation_list", 0444, sbi->s_proc, + donation_list_seq_show, sb); #ifdef CONFIG_F2FS_FAULT_INJECTION proc_create_single_data("inject_stats", 0444, sbi->s_proc, inject_stats_seq_show, sb); --=20 2.51.0.rc1.163.g2494970778-goog