2012-03-19 12:50:34

by Artem Bityutskiy

[permalink] [raw]
Subject: [PATCH] ext4: write superblock only once on unmount

From: Artem Bityutskiy <[email protected]>

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 <[email protected]>
---
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