lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Date:	Mon, 19 Mar 2012 14:50:34 +0200
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Ted Tso <tytso@....edu>
Cc:	Ext4 Mailing List <linux-ext4@...r.kernel.org>,
	Linux FS Maling List <linux-fsdevel@...r.kernel.org>
Subject: [PATCH] ext4: write superblock only once on unmount

From: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>

In some rather rare cases it is possible that ext4 may the superblock to the
media twice. This patch makes sure this does not happen. This should speed up
unmounting in those cases.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
---
 fs/ext4/super.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 502c61f..c1f5111 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -808,9 +808,6 @@ static void ext4_put_super(struct super_block *sb)
 	destroy_workqueue(sbi->dio_unwritten_wq);
 
 	lock_super(sb);
-	if (sb->s_dirt)
-		ext4_commit_super(sb, 1);
-
 	if (sbi->s_journal) {
 		err = jbd2_journal_destroy(sbi->s_journal);
 		sbi->s_journal = NULL;
@@ -827,8 +824,10 @@ static void ext4_put_super(struct super_block *sb)
 	if (!(sb->s_flags & MS_RDONLY)) {
 		EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
 		es->s_state = cpu_to_le16(sbi->s_mount_state);
-		ext4_commit_super(sb, 1);
 	}
+	if (sb->s_dirt || !(sb->s_flags & MS_RDONLY))
+		ext4_commit_super(sb, 1);
+
 	if (sbi->s_proc) {
 		remove_proc_entry(sb->s_id, ext4_proc_root);
 	}
-- 
1.7.7.6

--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists