linux-kernel - [PATCH v2] f2fs: including waf data in f2fs status information

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20230616043722epcms2p3073c77119d37f5f963b8a75801efb40f@epcms2p3>
Date:   Fri, 16 Jun 2023 13:37:22 +0900
From:   beomsu kim <beomsu7.kim@...sung.com>
To:     Chao Yu <chao@...nel.org>,
        "jaegeuk@...nel.org" <jaegeuk@...nel.org>,
        "linux-f2fs-devel@...ts.sourceforge.net" 
        <linux-f2fs-devel@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Yonggil Song <yonggil.song@...sung.com>,
        Seokhwan Kim <sukka.kim@...sung.com>,
        Daejun Park <daejun7.park@...sung.com>,
        Seonghun Kim <seonghun-sui.kim@...sung.com>
Subject: [PATCH v2] f2fs: including waf data in f2fs status information

When evaluating in f2fs, it takes much time to obtain waf data.
This patch helps to obtain waf data without calcluation.

Signed-off-by: Beomsu Kim <beomsu7.kim@...sung.com>
---
 fs/f2fs/iostat.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/fs/f2fs/iostat.c b/fs/f2fs/iostat.c
index 3d5bfb1ad585..59720639e8c0 100644
--- a/fs/f2fs/iostat.c
+++ b/fs/f2fs/iostat.c
@@ -34,10 +34,23 @@ int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset)
 {
        struct super_block *sb = seq->private;
        struct f2fs_sb_info *sbi = F2FS_SB(sb);
+       int j;
+       unsigned long long waf = 0;
+       unsigned long long data_written_by_user;
+       unsigned long long data_written_to_storage;
 
        if (!sbi->iostat_enable)
                return 0;
 
+       data_written_by_user = sbi->iostat_bytes[FS_DATA_IO];
+
+       data_written_to_storage = data_written_by_user;
+       for (j = FS_NODE_IO; j <= FS_CP_META_IO; j++)
+               data_written_to_storage += sbi->iostat_bytes[j];
+
+       if (data_written_by_user > 0)
+               waf = data_written_to_storage * 100 / data_written_by_user;
+
        seq_printf(seq, "time:          %-16llu\n", ktime_get_real_seconds());
        seq_printf(seq, "\t\t\t%-16s %-16s %-16s\n",
                                "io_bytes", "count", "avg_bytes");
@@ -81,6 +94,10 @@ int __maybe_unused iostat_info_seq_show(struct seq_file *seq, void *offset)
        IOSTAT_INFO_SHOW("fs discard", FS_DISCARD_IO);
        IOSTAT_INFO_SHOW("fs flush", FS_FLUSH_IO);
 
+       /* print waf */
+       seq_puts(seq, "[WAF]\n");
+       seq_printf(seq, "fs waf:                %llu.%02llu\n", waf / 100, waf % 100);
+
        return 0;
 }
 
-- 
2.17.1