linux-kernel - [PATCH 4.16 086/196] ext4: eliminate sleep from shutdown ioctl

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Message-Id: <20180422135108.748190074@linuxfoundation.org>
Date:   Sun, 22 Apr 2018 15:51:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Theodore Tso <tytso@....edu>
Subject: [PATCH 4.16 086/196] ext4: eliminate sleep from shutdown ioctl

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Theodore Ts'o <tytso@....edu>

commit a6d9946bb925293fda9f5ed6d33d8580b001f006 upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/ioctl.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -497,10 +497,8 @@ static int ext4_shutdown(struct super_bl
 		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;