On Fri, Jan 7, 2011 at 5:32 PM, Massimo Maggi <mass...@mmmm.it> wrote: > Are you suggesting to do: > 1)fopen with O_TRUNC, O_ATOMIC: returns fd to a temporary file > 2)application writes to that fd, with one or more system calls, in a > short time or in long time, at his will. > 3)at fclose (or even at fsync ) atomically swap "data pointer" of "real > file" with "temp file", then delete temp.In a transparent mode to > userland. (something similar to e4defrag). > Is this sum up correct?
Almost. Swap should probably not be done at fsync time. Other open references (for example running executables) should be swapped too. The new-file case has to be handled too. Olaf -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
