On Wed, Dec 05, 2012 at 12:16:50AM +0800, qixuan wu wrote: > > Is there the possibility: one thread(A) is read_dir(directly read > from buffer head), and another thread(B) is creating item, and fill > this buffer header at the same time. During create item, first modify > the last item's rec_len(let it point to next item which initially is > zero), then fill this added new item. This should be handled by the VFS, which uses i_mutex to protect directories before calling the filesystem-specific lookup, rename, readdir, etc functions. So absent some bug where we are missing taking i_mutex (a quick check didn't show any obvious missing paths, although I didn't do an exhaustive code audit), we should be OK.... if we had a bug here, I would have expected that one of the fs stress tests that we run would have shown them up pretty quickly. Regards, - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
