From: Xue jiufei Date: Mon, 23 Jun 2014 20:22:08 +0000 (-0700) Subject: ocfs2: revert "ocfs2: fix NULL pointer dereference when dismount and ocfs2rec simulta... X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b253bfd87866a38e11baf9b88c9d54c534cd70cd;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git ocfs2: revert "ocfs2: fix NULL pointer dereference when dismount and ocfs2rec simultaneously" 75f82eaa502c ("ocfs2: fix NULL pointer dereference when dismount and ocfs2rec simultaneously") may cause umount hang while shutting down truncate log. The situation is as followes: ocfs2_dismout_volume -> ocfs2_recovery_exit -> free osb->recovery_map -> ocfs2_truncate_shutdown -> lock global bitmap inode -> ocfs2_wait_for_recovery -> check whether osb->recovery_map->rm_used is zero Because osb->recovery_map is already freed, rm_used can be any other values, so it may yield umount hang. Signed-off-by: joyce.xue Reviewed-by: Mark Fasheh Cc: Joel Becker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c index c7a89cea5c5d..ddb662b32447 100644 --- a/fs/ocfs2/super.c +++ b/fs/ocfs2/super.c @@ -1925,15 +1925,11 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err) ocfs2_shutdown_local_alloc(osb); + ocfs2_truncate_log_shutdown(osb); + /* This will disable recovery and flush any recovery work. */ ocfs2_recovery_exit(osb); - /* - * During dismount, when it recovers another node it will call - * ocfs2_recover_orphans and queue delayed work osb_truncate_log_wq. - */ - ocfs2_truncate_log_shutdown(osb); - ocfs2_journal_shutdown(osb); ocfs2_sync_blockdev(sb);