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Due to limited stack space recursive functions are frowned upon in the Linux kernel. However, they often are the most elegant solution to a problem. The following code preserves the recursive function traverse_visitbp() but moves the local variables AND function arguments to the heap to minimize the stack frame size. Enough space is initially allocated on the stack for 20 levels of recursion. This change does ugly-up-the-code but it reduces the worst case usage from roughly 4160 bytes to 960 bytes on x86_64 archs. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!
Documentation for building, configuring, and using ZFS can be found at: http://wiki.github.com/behlendorf/zfs/