s for file extents who's generation is less than the current running transaction. When we mark extents as written we haven't been updating their generation so they were always being skipped. This wouldn't happen if you were to preallocate and then write in the same transaction, but if you for example prealloced a VM you could definitely run into this problem. This patch makes my fsync tester happy again. Thanks, Signed-off-by: Josef Bacik t*x