linux-ext4 - [PATCH 4/7] ext4: eliminate sleep from shutdown ioctl

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Date:   Mon, 19 Feb 2018 21:30:35 -0500
From:   Theodore Ts'o <tytso@....edu>
To:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc:     Theodore Ts'o <tytso@....edu>, stable@...r.kernel.org
Subject: [PATCH 4/7] ext4: eliminate sleep from shutdown ioctl

The msleep() when processing EXT4_GOING_FLAGS_NOLOGFLUSH was a hack to
avoid some races (that are now fixed), but in fact it introduced its
own race.

Signed-off-by: Theodore Ts'o <tytso@....edu>
Cc: stable@...r.kernel.org
---
 fs/ext4/ioctl.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 4d1b1575f8ac..16d3d1325f5b 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -498,10 +498,8 @@ static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 		break;
 	case EXT4_GOING_FLAGS_NOLOGFLUSH:
 		set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
-		if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
-			msleep(100);
+		if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 			jbd2_journal_abort(sbi->s_journal, 0);
-		}
 		break;
 	default:
 		return -EINVAL;
-- 
2.16.1.72.g5be1f00a9a