Hi, Recently I found syncfs and umount could not make data consistency in overlayfs. I did some investigations and now I know synchronization didn’t directly happen in upperdir filesystem during these operations executed in overlayfs. I'm also confused by below comment in function ovl_sync_fs() in super.c /* real inodes have already been synced by sync_filesystem(ovl_sb) */ In my understanding sync_filesystem(ovl_sb) can not make real inodes synced unless delivers real superblock of upperdir filesystem to sync_filesystem(). I can’t make sure current implementation is by design or for some other reasons because sync upperdir filesystem may be a little bit heavy especially in a large filesystem. Could anyone give me a hint for this？ If this problem needs to be fix, I’ll try to make a patch for review. Best Regards, Chengguang -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
