Hi, In recently trying to solve the several (longstanding) deadlocks in write(2), I developed what I believe to be the best solution. This requires that ->commit_write may be called with a length less than that which was passed to the prepare_write. If the length is different, it may be 0, and for !uptodate pages it will only be 0. There is no guarantee that the commit_write will ever be called later to fill the gap. I have gone through fs/libfs.c and fs/buffer.c, and not found any problems (apart from pre-existing bugs). I will attempt to work my way through other filesystems, but I could easily miss problems. This problem is now holding up other mm/ race fixes, so it is a question of when, not if. So filesystem maintainers, please check your code and fix it if broken, or come up with a better solution ;) Apologies for not cc'ing linux-fsdevel in the first place. Please join the thread on lkml and linux-mm: "[rfc] buffered write deadlock fix" message id 20061013143516.15438.8802.sendpatchset@xxxxxxxxxx and please cc me. Thanks, Nick - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
