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ext4: reflect mb_optimize_scan value in options file
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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@linux.ibm.com>
Link: https://lore.kernel.org/r/20220704054603.21462-1-ojaswin@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Ojaswin Mujoo authored and Theodore Ts'o committed Aug 3, 2022
1 parent b24e77e commit 3fa5d23
Showing 1 changed file with 9 additions and 0 deletions.
9 changes: 9 additions & 0 deletions fs/ext4/super.c
Original file line number Diff line number Diff line change
Expand Up @@ -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;
}
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