From: Artem Bityutskiy Date: Thu, 22 Mar 2012 02:29:15 +0000 (-0400) Subject: ext4: write superblock only once on unmount X-Git-Tag: firefly_0821_release~3680^2~3236^2~3 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a8e25a83245618e6b0ddf82a9bba79c1b466804d;p=firefly-linux-kernel-4.4.55.git ext4: write superblock only once on unmount 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 Signed-off-by: "Theodore Ts'o" --- diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 1e26f4a0b555..626c1f840118 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -836,9 +836,6 @@ 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; @@ -855,8 +852,10 @@ 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("options", sbi->s_proc); remove_proc_entry(sb->s_id, ext4_proc_root);