From: Chao Yu <yuchao0@huawei.com>
Date: Thu, 5 Jul 2018 06:24:11 +0000 (+0800)
Subject: f2fs: enable real-time discard by default
X-Git-Tag: v4.19-rc1~57^2~52
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=a39e5365835edcdb12140d423573c2b8ed39ebfb;p=uclinux-h8%2Flinux.git

f2fs: enable real-time discard by default

f2fs is focused on flash based storage, so let's enable real-time
discard by default, if user don't want to enable it, 'nodiscard'
mount option should be used on mount.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 98bfccc1d389..609ea8736dbf 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1367,12 +1367,12 @@ static void default_options(struct f2fs_sb_info *sbi)
 	set_opt(sbi, NOHEAP);
 	sbi->sb->s_flags |= SB_LAZYTIME;
 	set_opt(sbi, FLUSH_MERGE);
-	if (f2fs_sb_has_blkzoned(sbi->sb)) {
-		set_opt_mode(sbi, F2FS_MOUNT_LFS);
+	if (blk_queue_discard(bdev_get_queue(sbi->sb->s_bdev)))
 		set_opt(sbi, DISCARD);
-	} else {
+	if (f2fs_sb_has_blkzoned(sbi->sb))
+		set_opt_mode(sbi, F2FS_MOUNT_LFS);
+	else
 		set_opt_mode(sbi, F2FS_MOUNT_ADAPTIVE);
-	}
 
 #ifdef CONFIG_F2FS_FS_XATTR
 	set_opt(sbi, XATTR_USER);