From 9f203507ed277ee86e3f76a15e09db1c92e40b94 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Sat, 20 Apr 2013 15:46:17 -0400 Subject: ext4: mark all metadata I/O with REQ_META As Dave Chinner pointed out at the 2013 LSF/MM workshop, it's important that metadata I/O requests are marked as such to avoid priority inversions caused by I/O bandwidth throttling. Signed-off-by: "Theodore Ts'o" --- fs/ext4/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/ext4/super.c') diff --git a/fs/ext4/super.c b/fs/ext4/super.c index bfa29ecfb47a..dbc7c090c13a 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -4252,7 +4252,7 @@ static journal_t *ext4_get_dev_journal(struct super_block *sb, goto out_bdev; } journal->j_private = sb; - ll_rw_block(READ, 1, &journal->j_sb_buffer); + ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer); wait_on_buffer(journal->j_sb_buffer); if (!buffer_uptodate(journal->j_sb_buffer)) { ext4_msg(sb, KERN_ERR, "I/O error on journal device"); -- cgit v1.2.1