linux-kernel - [PATCH] f2fs: set file as cold when file defragmentation

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20210429062005epcms2p352ef77f96ab66cbffe0c0ab6c1b62d8a@epcms2p3>
Date:   Thu, 29 Apr 2021 15:20:05 +0900
From:   Daejun Park <daejun7.park@...sung.com>
To:     "jaegeuk@...nel.org" <jaegeuk@...nel.org>,
        "chao@...nel.org" <chao@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-f2fs-devel@...ts.sourceforge.net" 
        <linux-f2fs-devel@...ts.sourceforge.net>,
        Chao Yu <yuchao0@...wei.com>,
        Daejun Park <daejun7.park@...sung.com>
Subject: [PATCH] f2fs: set file as cold when file defragmentation

In file defragmentation by ioctl, all data blocks in the file are
re-written out-of-place. File defragmentation implies user will not update
and mostly read the file. So before the defragmentation, we set file
temperature as cold for better block allocation.

Signed-off-by: Daejun Park <daejun7.park@...sung.com>
---
 fs/f2fs/file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index d697c8900fa7..dcac965a05fe 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -2669,6 +2669,9 @@ static int f2fs_defragment_range(struct f2fs_sb_info *sbi,
 	map.m_len = pg_end - pg_start;
 	total = 0;
 
+	if (!file_is_cold(inode))
+		file_set_cold(inode);
+
 	while (map.m_lblk < pg_end) {
 		pgoff_t idx;
 		int cnt = 0;
-- 
2.25.1