From: Yongqiang Yang Date: Wed, 28 Dec 2011 18:55:51 +0000 (-0500) Subject: ext4: flush journal when switching from data=journal mode X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5872ddaaf05bf25e3ab90580295ebc946405928c;p=linux-beck.git ext4: flush journal when switching from data=journal mode It's necessary to flush the journal when switching away from data=journal mode. This is because there are no revoke records when data blocks are journalled, but revoke records are required in the other journal modes. However, it is not necessary to flush the journal when switching into data=journal mode, and flushing the journal is expensive. So let's avoid it in that case. Signed-off-by: Yongqiang Yang Signed-off-by: "Theodore Ts'o" --- diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index cb0ba9d77a8e..1254934de693 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4660,7 +4660,6 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val) } jbd2_journal_lock_updates(journal); - jbd2_journal_flush(journal); /* * OK, there are no updates running now, and all cached data is @@ -4672,8 +4671,10 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val) if (val) ext4_set_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); - else + else { + jbd2_journal_flush(journal); ext4_clear_inode_flag(inode, EXT4_INODE_JOURNAL_DATA); + } ext4_set_aops(inode); jbd2_journal_unlock_updates(journal);