Add support to display the mb_optimize_scan value in
/proc/fs/ext4/<dev>/options file. The option is only
displayed when the value is non default.
Signed-off-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
---
fs/ext4/super.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 845f2f8aee5f..e3fd50b0d6b7 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3011,6 +3011,15 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
} else if (test_opt2(sb, DAX_INODE)) {
SEQ_OPTS_PUTS("dax=inode");
}
+
+ if (sbi->s_groups_count >= MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
+ !test_opt2(sb, MB_OPTIMIZE_SCAN)) {
+ SEQ_OPTS_PUTS("mb_optimize_scan=0");
+ } else if (sbi->s_groups_count < MB_DEFAULT_LINEAR_SCAN_THRESHOLD &&
+ test_opt2(sb, MB_OPTIMIZE_SCAN)) {
+ SEQ_OPTS_PUTS("mb_optimize_scan=1");
+ }
+
ext4_show_quota_options(seq, sb);
return 0;
}
--
2.27.0
